Patent No.:CN201202760 Date:2008-01-14

Google Patent: https://patents.google.com/patent/CN201202760Y/en?oq=CN201202760

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

A Gas Spring with a Stable Variable Resistance Groove

Abstract
This utility model provides a gas spring with a stable variable resistance groove. The piston is built inside the cylinder and is fixed together with the piston rod through riveting or screws. The piston rod and the cylinder are sealed together with a guiding and sealing system. The rectangular sealing ring and the cylinder with the stable variable resistance groove, along with the rear plug, are welded together to form a sealed gas spring cylinder. This gas spring has a damping groove on the tube wall of the gas spring. The depth of the damping groove can be varied according to different damping requirements, and it does not get clogged.

Description
A Gas Spring with a Stable Variable Resistance Groove

Technical Field The utility model relates to a gas spring, specifically a gas spring with a stable variable resistance groove.

Background Technology Gas springs are widely used in the automotive industry, but the magnitude of damping force and damping speed of gas springs have always been research and improvement topics. Currently, to achieve the desired gas spring rebound speed, various methods have been applied to the piston, such as using small apertures, small apertures with short damping grooves, small apertures with annular damping grooves and shims, or bidirectional labyrinth grooves with double shims. These methods aim to reduce the damping area and lengthen the damping channel. Although these methods can change the rebound speed of gas springs and achieve good results, they also have issues like clogging of small apertures and abnormal noise when gas and oil pass through.

Utility Model Content This utility model provides a gas spring with a stable variable resistance groove.

To solve the above technical problems, the gas spring with a stable variable resistance groove of this utility model includes a piston built inside the cylinder, fixed together with the piston rod through riveting or screws, and a guiding and sealing system sealing the connection between the piston rod and the cylinder. The rectangular sealing ring and the cylinder with the stable variable resistance groove, along with the rear plug, are welded together to form a sealed gas spring cylinder.

The stable variable resistance groove can have different shapes.

Advantages of the Structure: The gas spring has a damping groove on the gas spring tube wall. The damping groove can be made in different forms according to different damping requirements, such as uniform depth, gradually shallower, gradually deeper, or alternating shallow and deep. No matter the form, they share a common feature: the damping groove will not clog. The reason is that the piston of this gas spring only has venting or oil holes without passing damping holes; its damping is achieved through the damping groove on the tube wall. This design not only achieves the desired rebound speed but also addresses issues such as clogging of small apertures and abnormal noise when gas and oil pass through, providing a relatively stable constant speed effect through different forms of damping grooves.

Description of Drawings

Figure 1 is a schematic diagram of the structure of this utility model.

Figure 2 is a schematic diagram of the variable resistance groove from shallow to deep and then to deep.

Figure 3 is a schematic diagram of the variable resistance groove from shallow to deep.

Detailed Implementation As shown in Figure 1, the piston 6 is built inside the cylinder and fixed together with the piston rod 1 through riveting or screws. The piston rod 1 and the cylinder are sealed together with a guiding and sealing system 2. The rectangular sealing ring 3 and the cylinder with the stable variable resistance groove 4, along with the rear plug 5, are welded together to form a sealed gas spring cylinder. As shown in Figures 2 and 3, the variable resistance groove can be of uniform depth, gradually shallower, gradually deeper, or alternating shallow and deep as needed. When the gas spring moves, the rectangular sealing ring 3, under pressure, tightly adheres to the inner wall of the cylinder with the stable variable resistance groove 4, sealing the other parts except for the damping groove. During the movement, the rectangular sealing ring 3 and the cylinder with the stable variable resistance groove 4 provide damping while opening, preventing any clogging. If a damping groove from shallow to deep is used, the rebound speed of the gas spring will approximate a constant speed, as the rebound speed of the gas spring is related to internal pressure and the cross-sectional area of the damping groove. When the piston rod extends, the internal pressure decreases, and the cross-sectional area of the damping groove increases, complementing each other to produce a relatively stable rebound speed.

Claims (2) – A Gas Spring with a Stable Variable Resistance Groove applied on dynamic damping gas spring invented by LeiYan Gas Springs.
1、A Gas Spring with a Stable Variable Resistance Groove, wherein the piston is built inside the cylinder and fixed together with the piston rod through riveting or screws, and the piston rod and the cylinder are sealed together with a guiding and sealing system; it is characterized by: the rectangular sealing ring, the cylinder with the stable variable resistance groove, and the rear plug are welded together to form a sealed gas spring cylinder.