Patent No.:CN214999037U Date:2021-04-25

Google Patent: https://patents.google.com/patent/CN214999037U/en?oq=CN214999037U

China Patent: http://epub.cnipa.gov.cn/

A Friction Piston Gas Sping
Abstract
This utility model provides a friction piston device, which includes a piston assembly and a closed cavity. A Y-type lip seal is arranged in the closed cavity, where the Y-type lip seal includes an outer lip and an inner lip, and the outer lip abuts against the inner wall of the closed cavity. The piston assembly includes a piston rod, a piston body, and a piston cap, and several flow holes are provided on the piston assembly. Through the inner lip of the Y-type lip seal tightly abutting against the piston body and the outer lip being squeezed by the air pressure in the cavity and the inner wall of the closed cavity, complete friction of the inner lip and sealed belt state frictional motion of the outer lip are formed. Moreover, gas or oil can only flow through the damping structure to form a certain damping force. Therefore, the friction generated by the friction piston device of this utility model achieves the effects of enhancing friction and excellent sealing performance, and at the same time improves work efficiency and service life, thereby solving the problem of poor sealing friction damping effect in the prior art.

This passage describes a patent for a “friction piston device.” Here’s a breakdown of the information:

• Device Components:
  • The device consists of a piston assembly and a closed cavity.
  • The piston assembly contains a piston rod, a piston body, and a piston cap, and has several flow holes.
  • The closed cavity has a Y-type lip seal with an outer lip and an inner lip.
• Functionality and Working Mechanism:
  • The inner lip of the Y-type lip seal tightly abuts the piston body.
  • The outer lip is subject to cavity air pressure and squeezing from the cavity’s inner wall, resulting in different types of friction for the inner and outer lips.
  • Gas or oil can only flow through a damping structure, creating a damping force.
• Advantages:
  • The friction generated by this device enhances friction and provides excellent sealing performance.
  • It improves work efficiency and service life.
  • It aims to address the problem of poor sealing friction damping effect in existing technologies.

This device seems designed to improve the performance of piston systems by using a unique Y-type lip seal configuration and associated friction and damping mechanisms to achieve better sealing and more efficient operation compared to prior art solutions.

Description
A Friction Piston Device
Technical Field
This utility model relates to the field of gas springs, and specifically to a friction piston device.
Background
A gas spring is a component that can realize functions such as support, buffering, and braking. In construction machinery, it is mainly used in parts such as covers and doors. A gas spring mainly consists of a piston rod, a piston, a sealing guide sleeve, a filler, a pressure cylinder, and joints. Among them, the pressure cylinder is a closed cavity filled with an inert gas or an oil-gas mixture, and the pressure inside the cavity is several times or dozens of times the atmospheric pressure.
The O-ring of a traditional gas spring is arranged in the piston groove, and the frictional force between the O-ring and the inner wall of the cylinder body is limited, resulting in problems such as poor sealing friction damping effect, unstable spring speed and compression speed, which reduces the consistency, stability, and service life of the product.
Therefore, there is an urgent need for a gas spring with an enhanced friction piston device to solve the problems of poor sealing friction damping effect and unstable spring speed and compression speed.
Utility Model Content
In view of this, this utility model provides an enhanced friction piston device that can solve at least one of the above problems. Through the frictional motion resistance generated by the extrusion of the outer lip to form a sealing belt state with the inner wall of the closed cavity, and then through the damping force generated by several flow holes and the damping structure on the piston assembly, the effect of enhancing friction and excellent sealing performance is achieved, meeting the working purpose of slow spring speed and slow compression speed.
To achieve the above purpose, this utility model provides the following technical solution: A friction piston device includes a piston assembly and a closed cavity, and the piston assembly moves back and forth in the closed cavity; wherein,
A Y-type lip seal is arranged in the closed cavity, the Y-type lip seal includes an outer lip and an inner lip, the outer lip abuts against the inner wall of the closed cavity, and a distance is preset between the inner lip and the damping hole;
The piston assembly includes a piston rod, a piston body sleeved on the piston rod, and a piston cap. The piston cap includes a left piston cap and a right piston cap. Several flow holes are provided on the piston assembly. The piston body includes a socket part and a stop part. The cross-sectional diameter of one end of the socket part is smaller than that of the other end. A damping structure is provided on the socket part and the piston rod, and the Y-type lip seal shifts by friction between the stop part and the piston cap.

This section of the patent description for the “friction piston device” includes the following key points:

• Technical Field and Background:
  • The device belongs to the gas spring field, which is used in construction machinery.
  • It points out the problems with traditional gas springs, where the O-ring’s limited friction with the cylinder wall leads to poor sealing, unstable speeds, and reduced product quality.
• Utility Model Content:
  • The friction piston device aims to solve these issues.
  • It consists of a piston assembly and a closed cavity, with the piston assembly moving back and forth in the cavity.
  • The closed cavity contains a Y-type lip seal with outer and inner lips. The outer lip contacts the cavity wall, and there’s a preset distance between the inner lip and the damping hole.
  • The piston assembly has a piston rod, piston body, and piston cap (left and right). It has several flow holes.
  • The piston body has a socket part with different cross-sectional diameters at its ends and a damping structure on the socket part and piston rod.
  • The Y-type lip seal moves by friction between the stop part and the piston cap.

This design appears to utilize the Y-type lip seal and damping structure to address the problems of traditional gas springs, with the aim of improving friction, sealing, and speed control through the interaction of these components and structures.

In some preferred embodiments, several of the flow holes include several first through holes provided on the stop part and several second through holes provided on the piston cap.
In some preferred embodiments, a first included angle and a second included angle are respectively set between the outer lip and the inner lip and the axis, where the first included angle and the second included angle are greater than zero degrees and less than ninety degrees.
In some preferred embodiments, the damping structure includes a damping hole and a damping gap, the damping hole is provided at one end near the socket part, and the damping gap is provided between the socket part and the piston rod.
In some preferred embodiments, the socket part includes a first socket part and a second socket part, and the first socket part and the second socket part are distributed on both sides of the stop part.
In some preferred embodiments, the Y-type lip seal includes a first Y-type lip seal and a second Y-type lip seal.
In some preferred embodiments, the first Y-type lip seal and the second Y-type lip seal are respectively sleeved on the first socket part and the second socket part.
In some preferred embodiments, the axial height of the outer lip is greater than the axial height of the inner lip.
In some preferred embodiments, the number of the damping holes is one.
In some preferred embodiments, the first through hole and the second through hole are adapted.

Features and Advantages of the Utility Model:
When the piston assembly is performing a compression motion, the Y-type lip seal forms a frictional displacement with the inner wall of the closed cavity and moves towards one end of the socket part (the end with a smaller cross-sectional diameter). The outer lip abuts on the left piston cap, and at this time, the inner lip disengages from the piston body to form an annular gas passing gap, and most of the gas or oil directly flows through several through holes on the piston assembly, enabling the compression motion to be completed easily, conveniently, and quickly, with high work efficiency. When the piston assembly is performing an extension motion, the Y-type lip seal is frictionally displaced to the other end of the socket part (the end with a larger cross-sectional diameter). At this time, the inner lip of the Y-type lip seal is on the piston body, and the outer lip is under the action of air pressure in the cavity and the squeezing of the inner wall of the closed cavity, forming a complete seal of the inner lip, and the outer lip is in a sealed belt state of frictional motion. Moreover, gas or oil can only flow through the damping hole and the damping gap to form a certain damping force. Therefore, the friction generated by the friction piston device of this utility model is much greater than the friction generated by the piston groove with an O-ring in the prior art, achieving the effect of enhancing friction and excellent sealing performance, and at the same time improving work efficiency and service life, thereby solving the problem of poor sealing friction damping effect in the prior art and meeting the working purpose of slow spring speed or slow compression speed.

Here is a detailed explanation of this part of the patent:

• Detailed Implementation of the Flow Holes:
  • The flow holes are divided into first through holes on the stop part and second through holes on the piston cap, which may play a role in gas or fluid flow during different motion states of the piston assembly.
• Angles of the Lips:
  • The outer and inner lips have first and second included angles with the axis, which are within a specific range (greater than 0° and less than 90°). These angles might affect the way the lips interact with other parts and the sealing and frictional behavior.
• Damping Structure Details:
  • The damping structure consists of a damping hole and a damping gap. The damping hole is located near one end of the socket part, and the damping gap is between the socket part and the piston rod. These components contribute to generating damping force during the motion of the device.
• Socket Part Configuration:
  • The socket part is divided into a first socket part and a second socket part on both sides of the stop part, which may provide more stable support or different functional requirements.
• Multiple Y-Type Lip Seals:
  • There can be first and second Y-type lip seals that are respectively sleeved on the first and second socket parts, possibly enhancing the sealing function.
• Lip Heights:
  • The axial height of the outer lip is greater than that of the inner lip, which could influence the sealing and frictional behavior of the device.
• Number of Damping Holes:
  • There is typically one damping hole, which is part of the damping force generation mechanism.
• Matching of Through Holes:
  • The first and second through holes are adapted, perhaps for better gas or fluid flow control.

Advantages and Working Mechanism of the Device:

• Compression Motion:
  • During compression, the Y-type lip seal moves, and the outer lip contacts the left piston cap, creating an annular gas passing gap. Gas or oil flows through the through holes, making compression easy and efficient.
• Extension Motion:
  • In extension, the Y-type lip seal moves to the other end of the socket part, resulting in complete sealing by the inner lip and frictional motion of the outer lip. Gas or oil can only pass through the damping hole and gap, generating damping force.
• Overall Benefits:
  • The device generates more friction than traditional piston grooves with O-rings, improving sealing, efficiency, and lifespan, addressing the poor damping issue, and meeting the need for slow motion speeds.

This utility model uses various configurations and interactions of components to optimize the performance of the friction piston device, particularly in terms of friction, sealing, and damping, compared to existing technologies.

Appendix Description
The following figures are used to provide a further understanding of this application, form a part of this application, and are only intended for schematic explanation and illustration of the utility model, not to limit the scope of the utility model. In the figures:
Figure 1 is the air flow diagram of the single enhanced friction piston device during compression motion in Example 1 of this application;
Figure 2 is the air flow diagram of the single enhanced friction piston device during extension motion in Example 1 of this application;
Figure 3 is the left side view of the Y-type lip seal in Example 1 of this application;
Figure 4 is the cross-sectional view along A – A in Figure 4;
Figure 5 is the left side view of the piston body in Example 1 of this application;
Figure 6 is the cross-sectional view along B – B in Figure 6;
Figure 7 is the air flow diagram of the double enhanced friction piston device during compression motion in Example 2 of this application;
Figure 8 is the air flow diagram of the double enhanced friction piston device during extension motion in Example 2 of this application;
Figure 9 is the cross-sectional view of the piston body including the double socket part in Example 2 of this application.

Reference numerals:

1. Closed cavity; 2. Y-type lip seal; 3. Piston rod; 4. Piston body; 21. Outer lip; 22. Inner lip; 201. First Y-type lip seal; 202. Second Y-type lip seal; 41. Socket part; 42. Stop part; 51. Left piston cap; 52. Right piston cap; 401. First socket part; 402. Second socket part; 410. Damping hole; 420. First through hole; 510. Second left through hole; 520. Second right through hole.

Specific Implementation Mode
The following will disclose several implementation modes of this application through diagrams, and clearly and completely describe the technical solution of the utility model. The accompanying drawings of the specification that form a part of this application are used to provide a further understanding of the utility model. The schematic examples and descriptions of the utility model are used to explain the utility model and do not constitute an improper limitation of the utility model. Based on the examples in the utility model, all other examples obtained by ordinary technicians in the field without creative work fall within the protection scope of the utility model.

It should be noted that unless otherwise defined, the directions of up, down, left, right, inner, and outer mentioned in this article are based on the up, down, left, right, inner, and outer directions shown in Figure 1 of this application example. If the specific posture changes, the directional indication will also change accordingly. The meanings of “multiple” and “several” are two or more. Here, it is explained together that the use of “first”, “second”, “third” and similar words does not indicate any order, quantity, or importance, but is used to distinguish different components. In addition, in various embodiments of the present disclosure, the same or similar reference numerals represent the same or similar components.

In the present utility model, unless otherwise clearly defined and limited, terms such as “connection” and “fixing” should be understood in a broad sense. For example, “fixing” can be a fixed connection, a detachable connection, or an integral connection, unless otherwise clearly limited. For ordinary technicians in the field, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

In addition, the technical solutions of the various embodiments of the utility model can be combined with each other, but it must be based on what ordinary technicians in the field can achieve. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

Here is an explanation of this section of the patent:

• Figure Overview:
  • The figures provide visual aids to understand different states and components of the friction piston device. Figures 1 and 2 show the air flow during compression and extension motion of the single enhanced friction piston device in Example 1.
  • Figures 3 and 4 show different views of the Y-type lip seal. Figures 5 and 6 show the piston body from different perspectives.
  • Figures 7 and 8 depict the air flow during motion of the double enhanced friction piston device in Example 2, and Figure 9 shows a cross-section of the piston body with double socket parts.
• Reference Numerals:
  • Each part of the device is labeled with a unique reference numeral, making it easier to identify and discuss specific components. For example, the closed cavity is 1, and different parts of the Y-type lip seal, piston rod, and piston body have their own reference numbers.
• Implementation Mode:
  • The specific implementation section aims to describe the technical solution clearly using the figures. It emphasizes that the figures are for understanding the utility model, not for limiting it.
  • It clarifies the meaning of directional terms and the use of ordinal words like “first”, “second”, etc., which are used for component distinction.
  • It also mentions the broad understanding of terms like “connection” and “fixing” and the conditions for combining different embodiments, ensuring that the patent’s protection scope is clear and reasonable.

This part of the patent uses figures and reference numerals to help understand the structure and function of the friction piston device in different motion states and configurations, and sets rules for interpreting the patent’s terms and combining embodiments.

Example 1
Please refer to Figures 1 to 6. A friction piston device in this example includes a piston assembly and a closed cavity 1. The piston assembly moves back and forth in the closed cavity 1, that is, performs extension or compression motion. Among them, a Y-type lip seal 2 is arranged in the closed cavity 1. As shown in Figures 3 and 4, the Y-type lip seal 2 in this example includes an outer lip 21 and an inner lip 22, and the outer lip 21 abuts against the inner wall of the closed cavity 1. As shown in Figures 1 and 2, the piston assembly includes a piston rod 3, a piston body 4 sleeved on the piston rod 3, and a piston cap. The piston cap includes a left piston cap 51 and a right piston cap 52, and is respectively provided with a second left through hole 510 and a second right through hole 520. The piston cap plays a role of shielding the Y-type lip seal 2 and increasing the force-bearing strength of the piston body 4 in the device. In combination with Figures 5 and 6, the piston body 4 in this example includes a socket part 41 and a stop part 42. One end 411 of the socket part is a cone structure, and the other end 412 is a column structure. As shown in Figure 6, D1 < D2, that is, the cross-sectional diameter of the cone structure gradually decreases along the direction away from the column structure. Further, a damping hole 410 is provided on the socket part 41, and a damping structure such as a damping gap is provided between the socket part 41 and the piston rod 3. Among them, the damping gap is preferably a threaded damping groove. The number of Y-type lip seals 2 in this example is one, and it can be set to two, three, or more according to actual conditions.

As shown in Figure 5, as a specific implementation, several flow holes in this example include several first through holes 420 provided on the stop part 42 and several second through holes provided on the piston cap. Further preferably, the aperture sizes and numbers of the first through holes 420 and the second through holes are adapted. In this example, the number of both the first through holes and the second through holes is 6. Of course, it can be set to 3, 4, or more according to actual conditions.

As shown in Figures 3 and 4, as a specific implementation, the axial height H1 of the outer lip 21 of the Y-type lip seal 2 in this example is greater than the axial height H2 of the inner lip 22. The design of this solution is more conducive to the smooth flow of gas or oil.

As shown in Figure 4, as a specific implementation, a first included angle α and a second included angle β are respectively set between the outer lip 21 and the inner lip 22 and the axis in this example, where the degrees of the first included angle α and the second included angle β are: 0° < α ≤ 45°, 0° < β ≤ 45°. The design of this angle makes the Y-type lip seal have strong elasticity, resistance to friction aging, and good sealing effect.

As a specific implementation, the number of damping holes 410 in this example is one, which is more conducive to the implementation of the damping effect, making the spring speed of the piston assembly stable, the working state stable, and the service life extended.

Combined with the air flow diagrams of the compression motion and extension motion in Figures 1 and 2, the working principle of applying the enhanced friction piston device with a single Y-type lip seal in this example in a gas spring is described as follows:
As shown in Figure 1, when the piston assembly moves to the right during the compression motion in the closed cavity of the gas spring, the Y-type lip seal 2 forms a frictional displacement with the inner wall of the closed cavity 1 and moves to the left, so that the large-diameter end of the outer lip 21 tightly abuts on the left piston cap 51. At this time, the inner lip 22 disengages from the socket part 41 of the piston body 4 to form an annular gas passing gap, and most of the gas flows in from several second right through holes 520 and several first through holes 420, passes through the gas gap, and then directly flows out through several second left through holes 510. At this time, the frictional resistance only comes from the complete sealing belt formed by the extrusion of the outer lip of the Y-type seal and the inner wall of the closed cavity, so that the compression motion is completed easily, conveniently, and quickly, and the work efficiency is high.
As shown in Figure 2, when the piston assembly moves to the left during the extension motion in the closed cavity of the gas spring, the Y-type lip seal 2 is frictionally displaced and moves to the right, so that the small-diameter end of the Y-type lip seal 2 abuts on the right piston cap 52. At this time, the inner lip of the Y-type lip seal 2 is on the piston body, and the outer lip is under the action of air pressure in the cavity and the extrusion of the inner wall of the closed cavity 2, forming a complete seal of the inner lip surface, and the outer lip is in a sealed belt state of frictional motion. At this time, most of the gas flows in from several second left through holes 510 and flows out through the damping hole 410 and the threaded damping groove. This flow path forms a certain damping force. Therefore, through the extrusion of the inner lip and the outer lip of the Y-type lip seal 2 by the piston body 4 and the inner wall of the closed cavity 2 at the same time, the frictional force generated by the double-sided complete frictional sealing belt, together with the gap damping force, is much greater than the frictional force generated by the piston groove with an O-ring in the prior art, achieving the effect of enhancing friction and excellent sealing performance.

It should be noted that the assembly of the piston assembly shown in Figures 1 and 2 in this example is one application form of enhancing friction. According to actual conditions, the piston body and the Y-type lip seal can also be turned 180 degrees together for assembly to form another application form of enhancing friction.

Here is a detailed explanation of this example:

• Device Components and Structure:
  • Piston Assembly and Closed Cavity: The piston assembly moves back and forth in the closed cavity 1.
  • Y-Type Lip Seal: Consists of outer lip 21 and inner lip 22. The outer lip abuts the cavity wall, and its axial height H1 is greater than the inner lip’s height H2, aiding gas/oil flow.
  • Piston Body and Cap: The piston body 4 has a socket part 41 (with a cone and a column structure) and a stop part 42. The piston cap has left and right caps (51 and 52) with through holes (510 and 520). The cap also strengthens the piston body.
  • Damping Structure: The socket part 41 has a damping hole 410 and a damping gap (preferably a threaded damping groove) between it and the piston rod 3.
  • Flow Holes: Include first through holes 420 on the stop part and second through holes on the piston cap. Their sizes and numbers (6 in this case) can be adjusted based on requirements.
  • Angles: The outer and inner lips have angles α and β (0° < α ≤ 45°, 0° < β ≤ 45°) with the axis, enhancing elasticity and sealing.
• Working Principle and Functionality:
  • Compression Motion: During compression, the Y-type lip seal moves left, outer lip contacts left cap, inner lip detaches forming a gap. Gas flows through holes 520, 420, and 510, with friction mainly from the outer lip’s seal, making compression easy.
  • Extension Motion: During extension, the Y-type lip seal moves right, with inner lip sealing and outer lip in frictional motion. Gas flows through holes 510, damping hole 410, and damping groove, generating damping force.
  • Friction Enhancement: The combination of lip friction and damping force exceeds that of traditional piston-groove with O-ring, improving sealing and friction.
  • Flexibility: The assembly can be rotated 180 degrees for another application form, showing versatility.

This example describes the construction and operation of a friction piston device in detail, explaining how different components work together during compression and extension motions, and highlighting its advantages in terms of friction and sealing over existing designs.

Example 2
This example is different from Example 1. As shown in Figures 7 to 9, the number of Y-type lip seals 2 in this example is two, that is, a double enhanced friction piston device. According to actual conditions, it can be set to 3, 4, or more Y-type lip seals, and the number of socket parts of the piston body is consistent with the number of Y-type lip seals.

As a specific implementation, the first Y-type lip seal 201 and the second Y-type lip seal 202 in this example are respectively sleeved on the first socket part 401 and the second socket part 402. Further, the first socket part 401 and the second socket part 402 are respectively arranged on both sides of the stop part 42.

Combined with the air flow diagrams of the compression motion and extension motion of the double enhanced friction piston device shown in Figures 7 and 8, the working principle of applying the double enhanced friction piston device with two Y-type lip seals in this example in a gas spring is described as follows:

As shown in Figure 7, when the piston assembly moves to the right during the compression motion in the gas spring’s closed cavity, both the first Y-type lip seal 201 and the second Y-type lip seal 202 form frictional displacements with the inner wall of the closed cavity 1 and move to the left, so that the large-diameter end of the outer lip of the first Y-type lip seal 201 tightly abuts on the left piston cap 51, and the large-diameter end of the outer lip of the second Y-type lip seal 202 tightly abuts on the stop part 42. At this time, the inner lip of the first Y-type lip seal 201 disengages from the first socket part 401 to form an annular first gas passing gap, and the inner lip of the second Y-type lip seal 202 disengages from the second socket part 402 to form an annular second gas passing gap. Most of the gas flows in from several second right through holes 520, passes through the second gas passing gap, flows into several first through holes 420, and then directly flows out through several second left through holes 510 through the first gas passing gap. At this time, the frictional resistance comes from the first complete sealing belt and the second complete sealing belt formed by the extrusion of the outer lip of the first Y-type seal and the outer lip of the second Y-type seal with the inner wall of the closed cavity respectively. In the case of a closed cavity of the same model, the friction force formed by this double enhanced friction piston device is more than twice that of Example 1. Under the condition of meeting the friction force requirement, the compression motion is completed easily, conveniently, and quickly, and the work efficiency is high.

As shown in Figure 8, when the piston assembly moves to the left during the extension motion in the gas spring’s closed cavity, both the first Y-type lip seal 201 and the second Y-type lip seal 202 form frictional displacements with the inner wall of the closed cavity 1 and move to the right, so that the inner lip and the outer lip of the first Y-type lip seal 201 are simultaneously extruded by the first socket part 401 and the inner wall of the closed cavity 2 to form a first double-sided completely frictional sealing belt, tightly closing the first through holes 420. At the same time, the inner lip and the outer lip of the second Y-type lip seal 202 are simultaneously extruded by the second socket part 402 and the inner wall of the closed cavity 2 to form a second double-sided completely frictional sealing belt, tightly closing the second right through holes. At this time, most of the gas flows in from several second left through holes 510 and flows out through the damping hole 410 and the damping gap. This flow path forms a certain damping force. Therefore, the frictional force generated by the first double-sided completely frictional sealing belt and the second double-sided completely frictional sealing belt, together with the gap damping force, is much greater than the frictional force generated by the piston groove with an O-ring in the prior art, achieving the effect of enhancing friction and excellent sealing performance.

Here is a detailed explanation of Example 2:

• Component Variation from Example 1:
  • The number of Y-type lip seals is increased to two (first Y-type lip seal 201 and second Y-type lip seal 202), and they are respectively sleeved on first socket part 401 and second socket part 402, which are on both sides of the stop part 42. This can be adjusted to more than two based on actual needs.
• Working Principle in Compression Motion:
  • During compression, both Y-type lip seals move left. The outer lips of the two seals abut on different parts (left piston cap 51 and stop part 42), creating first and second gas passing gaps. Gas flows through multiple through holes (520, 420, and 510) via these gaps.
  • The friction comes from the complete sealing belts formed by the outer lips of both Y-type seals against the cavity wall, and the resulting friction force is more than double that of Example 1, making compression easier and more efficient under the same friction requirements.
• Working Principle in Extension Motion:
  • During extension, both Y-type lip seals move right. The inner and outer lips of both seals are compressed by their respective socket parts and the cavity wall, forming double-sided completely frictional sealing belts, closing off through holes (420 and second right through holes).
  • Gas flows in from second left through holes 510, through the damping hole 410 and damping gap, generating damping force.
  • The combined friction from the double-sided sealing belts and damping force exceeds that of traditional piston-groove with O-ring, enhancing friction and sealing performance.

This example shows how increasing the number of Y-type lip seals affects the performance of the friction piston device during compression and extension motions, providing greater friction and sealing compared to Example 1.

Note
It should be noted that the assembly of the piston assembly shown in Figures 7 and 8 in this example is one application form of double enhanced friction. According to actual conditions, the piston body and the Y-type lip seal can also be turned 180 degrees together for assembly to form another application form of double enhanced friction.

Summary
In conclusion, when the piston assembly in this application is performing a compression motion, the Y-type lip seal forms a frictional displacement with the inner wall of the closed cavity and moves towards one end of the socket part. The outer lip abuts on the left piston cap, and at this time, the inner lip disengages from the piston body to form an annular gas passing gap, and most of the gas or oil directly flows through several through holes on the piston assembly, enabling the compression motion to be completed easily, conveniently, and quickly, with high work efficiency. When the piston assembly is performing an extension motion, the Y-type lip seal is frictionally displaced to the other end of the socket part. At this time, the inner lip of the Y-type lip seal tightly abuts on the piston body, and the outer lip is under the action of air pressure in the cavity and the squeezing of the inner wall of the closed cavity, forming a complete seal of the inner lip, and the outer lip is in a sealed belt state of frictional motion. Moreover, gas or oil can only flow through the damping hole and the thread to form a certain damping force. Therefore, the friction generated by the friction piston device of this utility model is far greater than the friction generated by the piston groove with an O-ring in the prior art, achieving the effect of enhancing friction and excellent sealing performance, and at the same time improving work efficiency and service life, thereby solving the problem of poor sealing friction damping effect in the prior art and meeting the working purpose of slow spring speed or slow compression speed.

The above description shows and describes the preferred implementation mode of this application. However, as mentioned before, it should be understood that this application is not limited to the form disclosed herein, and should not be regarded as excluding other implementation modes. It can be used in various other combinations, modifications, and environments, and can be modified through the above teachings or technologies or knowledge in related fields within the scope of the concept of this application. Any changes and variations made by those skilled in the art without departing from the spirit and scope of this application shall fall within the protection scope of the appended claims of this application.

Here is a comprehensive explanation of the overall content:

• Flexibility of Assembly:
  • Just like in Example 1, the assembly in this example (shown in Figures 7 and 8) has flexibility. It can be rotated 180 degrees with the piston body and Y-type lip seal together to form another application form of double enhanced friction, showing the versatility of the design.
• Overall Working Mechanism Summary:
  • Compression Motion:
    • Y-type lip seal moves and forms a frictional displacement with the cavity wall during compression.
    • Outer lip contacts the left piston cap, inner lip detaches, creating an annular gas passing gap.
    • Gas/oil flows through through holes easily, making compression efficient.
  • Extension Motion:
    • Y-type lip seal moves to the other end of the socket part.
    • Inner lip seals against the piston body, outer lip has frictional motion in a sealed belt state due to air pressure and cavity wall squeezing.
    • Damping force is generated by gas/oil flowing through damping holes and threads.
  • Advantages:
    • Friction generated by this device is significantly greater than that of traditional piston groove with O-ring.
    • Enhances friction and sealing performance.
    • Improves work efficiency and service life.
    • Solves the problem of poor sealing friction damping effect in existing technology.
    • Meets the requirement of slow motion speeds (spring or compression).
  • General Consideration:
    • The application is not limited to the described forms. It allows for various combinations and modifications as long as they stay within the spirit and scope of the patent, emphasizing the adaptability and potential for further development of the design based on the knowledge and technology in related fields.

This summary highlights the key points of the friction piston device’s operation, its advantages, and the flexibility of its design, showing how it improves upon existing technology and its potential for further innovation within the scope of the patent.

Claims (10) – A Friction Piston Gas Sping, invented by LeiYan Gas Spring, a pioneer Chinese Gas Spring Manufacturer.
Hide Dependent

1. A friction piston device, including a piston assembly and a closed cavity, where the piston assembly moves back and forth in the closed cavity; characterized in that
   a Y-type lip seal is arranged in the closed cavity, the Y-type lip seal includes an outer lip and an inner lip, and the outer lip abuts against the inner wall of the closed cavity;
   the piston assembly includes a piston rod, a piston body sleeved on the piston rod, and a piston cap, several flow holes are provided on the piston assembly, the piston body includes a socket part and a stop part, one end of the socket part is a cone structure, the other end is a column structure, a damping structure is provided on the socket part and the piston rod, and the Y-type lip seal is frictionally displaced between the stop part and the piston cap.

This claim defines the basic structure of the friction piston device. It consists of a piston assembly and a closed cavity. The piston assembly moves within the cavity. The Y-type lip seal within the cavity has an outer lip that contacts the cavity’s inner wall and an inner lip. The piston assembly includes a piston rod, piston body, and piston cap, with flow holes. The piston body’s socket part has a cone structure at one end and a column structure at the other, and there’s a damping structure on the socket part and piston rod. The Y-type lip seal moves by friction between the stop part and the piston cap.

2. A friction piston device according to claim 1, characterized in that several of the flow holes include several first through holes provided on the stop part and several second through holes provided on the piston cap.

This claim elaborates on the flow holes mentioned in claim 1, specifying that they include first through holes on the stop part and second through holes on the piston cap.

3. A friction piston device according to claim 2, characterized in that the first through hole and the second through hole are adapted.

This claim further clarifies that the first and second through holes are adapted to each other, perhaps meaning they have similar sizes or configurations to work together effectively.

4. A damping device friction piston device according to claim 1, characterized in that the axial height of the outer lip is greater than the axial height of the inner lip.

This claim indicates a size difference between the outer and inner lips of the Y-type lip seal, which might affect the device’s performance, perhaps related to fluid flow or sealing.

5. A friction piston device according to claim 1, characterized in that a first included angle and a second included angle are respectively set between the outer lip and the inner lip and the axis, where the degrees of the first included angle and the second included angle are greater than zero degrees and not greater than forty-five degrees.

This claim sets the range of angles between the lips and the axis, which could influence the way the Y-type lip seal interacts with other parts, affecting factors like sealing and frictional behavior.

6. A friction piston device according to claim 1, characterized in that the damping structure includes a damping hole and a damping gap, the damping hole is provided at one end near the socket part, and the damping gap is provided between the socket part and the piston rod.

This claim details the damping structure, showing its location on the device, with the damping hole near the socket part and the damping gap between the socket part and piston rod, contributing to the device’s damping function.

7. A friction piston device according to claim 1, characterized in that the number of the damping holes is one.

This claim specifies the number of damping holes, which may affect the damping effect and overall performance of the device.

8. A friction piston device according to claim 1, characterized in that the Y-type lip seal includes a first Y-type lip seal and a second Y-type lip seal.

This claim introduces the possibility of having multiple Y-type lip seals, which could enhance the sealing or other functions of the device.

9. A friction piston device according to claim 8, characterized in that the socket part includes a first socket part and a second socket part, and the first socket part and the second socket part are respectively arranged on both sides of the stop part.

This claim describes the structure of the socket part in the case of having multiple Y-type lip seals, with the first and second socket parts located on either side of the stop part.

10. A friction piston device according to claim 9, characterized in that the first Y-type lip seal and the second Y-type lip seal are respectively sleeved on the first socket part and the second socket part.

This claim shows how the multiple Y-type lip seals are arranged on the corresponding socket parts, completing the detailed configuration of the device when using multiple seals.

These claims collectively define the various aspects of the friction piston device, from its basic structure to specific features and configurations. They protect different elements of the device’s design and function, outlining its components and how they interact to achieve the desired performance characteristics, such as enhanced friction, good sealing, and damping effects.