Patent No.:CN2738034 Date:2004-11-12

Google Patent: https://patents.google.com/patent/CN2738034Y/en?oq=CN2738034

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

Abstract

A sheath type gas spring of the utility model overcomes the shortage of the existing gas spring product whose surface of the cylinder rod is subject to corrosion by dust, sand, or corrosive liquid. The utility model comprises a cylindrical cylinder body and a piston rod whose end is connected with a piston. The circumferential surface of the piston is embedded with a sealing ring. The circumferential surface of the piston rod is provided with a protective rod device which comprises a protective tube whose inner diameter is a little greater than the outer diameter of the cylindrical cylinder body. The protective tube is provided with a through hole on one end and sheathed on the connecting piece of the piston rod, being fixed by a screw nut. The internal wall of the other end of the protective tube is supported on the circumferential surface of the cylindrical cylinder body after being transited via sliding fitted with a sealed body. When the piston rod of the utility model product extends out under the pressure of the air chamber, the protective tube can effectively increase the mechanical strength of air spring product, preventing bending deformation of the piston rod and increasing the service life of the product.

Description

The protective-cover type gas spring

Technical field

The utility model relates to a kind of pressurized gas air spring manufacturing technology field direct or promotion piston rod movement after the damping of hydraulic piston that utilizes in the sealed cylinder block, and especially pointer is to the guard bar device of air spring piston rod.

Background technique

The air spring of selling on the market mainly comprises a support spring and a controlled spring now, the former the comparatively typical representative products such as the day for announcing are on August 9th, 1989, the patent No. for the ZL88214885.0 name is called the product of ” drawing air spring “, and the comparatively typical representative products of the latter such as the day for announcing are that on November 20th, 1991, the patent No. are called the product of ” air spring ” for the ZL91208083.3 name.But, all be to utilize the pressed gas that charges in the sealed cylinder block to promote piston, thereby finish the fore and aft motion of piston rod no matter be the former or latter’s product.In actual application; because air spring uses, the difference of workplace; particularly above-mentioned two series products are devoted high dust, sand grains or during often with rugged environment such as corrosive liquids contact; because piston rod surface directly exposes chronically; very easily cause wearing and tearing or corrosion; so that produce gas leakage, oil leakage phenomenon, have a strong impact on work, greatly reduction of service life.In addition, if the working stroke of air spring is required when longer, new requirement has been arranged again for the mechanical strength of piston rod.For this reason, people expect to invent the air spring product that a kind of piston rod partly adds protective gear, to improve the working environment of piston rod surface, reduce heel and toe wear.Simultaneously, can improve the mechanical strength and the rigidity of piston rod part again, preventing influences normal the use because of piston rod is crooked, overcomes deficiency and defective that prior art exists, and it is required to satisfy more machinery assembling and manufacturer.

The model utility content

The technical problems to be solved in the utility model is: the piston rod surface that effectively overcomes prior art field air spring product is subject to dust, sand grains or corrosive liquids and corrodes; thereby produce the defective and the deficiency of gas leakage, oil leakage phenomenon; the air spring product that provides a kind of piston rod partly to add the guard bar device to society; the mechanical strength and the rigidity of whole air spring product in the time of simultaneously can effectively improving piston rod again and stretch out, it is required to satisfy more user.

The technological scheme that its technical problem that solves the utility model adopts is: the protective-cover type air spring comprises that a circle tube cylinder and an end insert into the inner the piston rod in chamber; the piston rod end of stretching into the circle tube cylinder inner chamber is connected with piston; the piston circumferential surface is embedded with seal ring; the other end of circle tube cylinder by the back stifled give airtight; described piston rod circumferential surface is provided with the guard bar device, and this guard bar device can protect piston rod surface to avoid the erosion of dust, sand grains or corrosive liquids.

Described guard bar device comprises that an internal diameter is slightly larger than the pillar of circle tube cylinder external diameter, and the joint that this pillar one end is established through hole and is placed in piston rod is fixed by nut; The inwall of pillar another port is after the seal transition that is slidingly matched, and is supported in the circumferential surface of circle tube cylinder.

The utility model protective-cover type air spring product is installed pillar that an internal diameter is slightly larger than the circle tube cylinder external diameter as the guard bar device at the piston rod circumferential surface, can effectively protect piston rod surface to avoid the erosion of dust, sand grains or corrosive liquids.Piston rod is subjected to air chamber pressure and when stretching out, pillar can effectively improve the mechanical strength and the rigidity of whole air spring product again, prevents piston rod bending deflection, thereby improves the working life of product.Numerous areas such as this product structure is simple, novel, can be widely used in that medical bed is leaned to one side, aviation and vehicle seat back adjusting.

Description of drawings

Fig. 1 is the utility model structural representation.

Embodiment

As shown in Figure 1, the utility model protective-cover type air spring comprises that a circle tube cylinder 5 and an end insert into the inner the piston rod 1 in chamber, and piston rod 1 end of stretching into circle tube cylinder 5 inner chambers is connected with piston 7, and piston 7 circumferential surfaces are embedded with seal ring 6.The other end of circle tube cylinder 5 gives airtight by back stifled 8.For the smooth running that guarantees piston rod 1 and prevent the hydraulic oil seepage, circle tube cylinder 5 inner chambers that are away from stifled 8 one ends in back are established guide sleeve 2, Sealing 3 and spacer 4 successively.According to component such as the aforementioned piston rod that provides 1, guide sleeve 2, Sealing 3, spacer 4, circle tube cylinder 5, seal ring 6, piston 7 and backs stifled 8, those skilled in the art are enough to it is assembled into an air spring product.For the product in prior art field, the utility model product is provided with the guard bar device at the circumferential surface of piston rod 1, and this guard bar device can effectively protect piston rod 1 circumferential surface to avoid the erosion of dust, sand grains or corrosive liquids.Described guard bar device comprises that an internal diameter is slightly larger than the pillar 10 of circle tube cylinder 5 external diameters, and the joint that these pillar 10 1 ends are established through hole and are placed in piston rod 1 is fixing by nut 9.The inwall of pillar 10 another port is after seal 11 transition that are slidingly matched, and is supported in the circumferential surface of circle tube cylinder 5.

The guard bar device of the utility model product is avoided the erosion of dust, sand grains or corrosive liquids in the time of can effectively protecting piston rod work, reduce heel and toe wear.Piston rod is subjected to air chamber pressure and when stretching out, can effectively improves the mechanical strength and the rigidity of whole air spring product again, prevents piston rod bending deflection, thereby improves the working life of product.The guard bar device of the utility model product both can be applicable to support the air spring product, also can be applicable to controlled air spring product.

Claims (2)

1, a kind of protective-cover type air spring; comprise that a circle tube cylinder and an end insert into the inner the piston rod in chamber; the piston rod end of stretching into the circle tube cylinder inner chamber is connected with piston; the piston circumferential surface is embedded with seal ring; the other end of circle tube cylinder by the back stifled give airtight; it is characterized in that described piston rod circumferential surface is provided with the guard bar device, this guard bar device can protect piston rod surface to avoid the erosion of dust, sand grains or corrosive liquids.

2, protective-cover type gas spring as claimed in claim 1 is characterized in that described guard bar device comprises that an internal diameter is slightly larger than the pillar of circle tube cylinder external diameter, and the joint that this pillar one end is established through hole and is placed in piston rod is fixed by nut; The inwall of pillar another port is after the seal transition that is slidingly matched, and is supported in the circumferential surface of circle tube cylinder.