CN2395084Y

CN2395084Y - Damper piston

Info

Publication number: CN2395084Y
Application number: CN 99208561
Authority: CN
Inventors: 全新明; 邢云明
Original assignee: XICHUAN AUTOMOBILE FITTING PLANT
Current assignee: XICHUAN AUTOMOBILE FITTING PLANT
Priority date: 1999-04-23
Filing date: 1999-04-23
Publication date: 2000-09-06
Anticipated expiration: 2009-04-23

Abstract

The utility model relates to a damper piston, comprising a cylindrical piston basal body, and a plurality of oil holes which are arranged on the piston basal body along an axial direction. The outer surface of the piston basal body is provided with a plurality of transverse grooves and is surrounded by an elastic piston jacket. The damper piston designed by the utility model which does not directly contact a working cylinder has the advantages of small frictional force, favorable abrasive resistance and long service life. Hydraulic pressure can be used for compensating interstices resulted from the assembly of the damper piston and the service abrasion of the damper piston in time to effectively prevent abnormal leakage when a damper works to enable the damper to have a high temperature damping performance. The damper piston has the advantages of simple assembly and high efficiency, which is convenient for mass production in a production line mode.

Description

A kind of new type vibration isolator piston

The utility model relates to auto parts, particularly a kind of new type vibration isolator plug cock.

The prior oscillating damper piston, in order to guarantee that piston had both had the better seal performance, be unlikely to stuck again with clutch release slave cylinder, adopt the double-sealing link usually, promptly the steel backing composite bearing of opening is adopted in the upper end, the lower end is the nylon piston ring of opening, and this constitutional detail is more, the cost height, difficulty is installed, manufacturing efficiency is low, can not fundamentally solve the leakage problem of fluid, and the temperature of the vibration damper performance that declines is also relatively poor.

But, if adopt the not piston ring and the compound steel-backed bearing of opening, may occur again after vibration damper works long hours the temperature rising, because thermal expansion and the phenomenon that clutch release slave cylinder is stuck, when there is the gap in piston ring, the leakage problem of fluid is inevitable again, causes the temperature damping of vibration damper just to can not get effective control.

The purpose of this utility model provides a kind of novel damper piston that has overcome the above-mentioned defective of prior art.

The new type vibration isolator piston of the utility model design comprises cylindric piston matrix, a plurality of oilholes that the piston matrix is provided with vertically, and a plurality of cross grooves that are provided with on the plug cock outer surface of matrix, and be with the elastic piston overcoat on the piston outer surface of matrix.

Wherein, described oilhole can divide inside and outside two circles to be provided with respectively, and the cross section of oilhole can be circle, square, rectangular.

The upper end of described piston jacket can be open shape, and promptly diameter is bigger slightly than the bottom, and this part under the fluid pressure effect corresponding radial deformation takes place, and with gap possible between compensating piston overcoat and the clutch release slave cylinder, realizes the self-adapting seal of piston; This piston jacket adopts whole wide ring-type polytetrafluoroethylplastic plastic, and to adopt special process and piston matrix bond be one, bears the lateral force of vibration damper when driving a vehicle.

This piston jacket adopts whole wide ring (6-12mm) structure that friction factor is little, compressive strength is higher, be enough to guarantee that it has higher side direction bearing capacity, its side direction bearing capacity is 7500N (is example with clutch release slave cylinder diameter 30mm) in theory, and the normal lateral load of using of vibration damper is as below the 1000N, so can satisfy the use of vibration damper fully.

The working principle of this new type vibration isolator piston is:

When piston rod moves upward with respect to vibration damper, the shock absorber oil voltage rise height that piston is above, according to Pascal's law, liquid produces circumferential pressure P to the piston jacket upper end part, wherein make piston jacket be affixed on the clutch release slave cylinder internal surface along fluid pressure perpendicular to the piston jacket anchor ring, and oil pressure is high more, and piston jacket and clutch release slave cylinder paste closely more, thereby reaches the purpose of stabilized seal.

Do not exist directly between the new type vibration isolator piston of the utility model design and the clutch release slave cylinder to contact, frictional force is little, and wear resistance is good, long working life; The pressure that can rely on liquid give timely compensation to product in the assembling and the gap of using wearing and tearing to cause, thereby the improper leakage can control vibration damper work effectively the time reaches and improves the decline purpose of performance of vibration damper temperature.The assembling of this product is simple, and the efficient height is convenient to the production line mass production.

Further describe the utility model below in conjunction with drawings and Examples.

Accompanying drawing 1 is the cross-sectional view of this new type vibration isolator piston.

Accompanying drawing 2 is the plan view of this new type vibration isolator piston.

Wherein, label 1 is the piston matrix, and 2 is oilhole, and 3 is piston jacket, and 4 is groove, and 5 is the plug cock bar.

New type vibration isolator piston as shown in the figure comprises cylindric piston matrix 1, a plurality of oilholes 2 that the piston matrix is provided with vertically, and a plurality of cross grooves 4 that are provided with on the plug cock outer surface of matrix, and be with elastic piston overcoat 3 on the piston outer surface of matrix.

The upper end of described piston jacket is open shape, and promptly diameter is bigger slightly than the bottom.

Claims

1, a kind of new type vibration isolator piston is characterized in that comprising cylindric piston matrix, a plurality of oilholes that the piston matrix is provided with vertically, and a plurality of cross grooves that are provided with on the plug cock outer surface of matrix, and be with the elastic piston overcoat on the piston outer surface of matrix.

2, new type vibration isolator piston as claimed in claim 1 is characterized in that described oilhole divides inside and outside two circles to be provided with respectively, and the cross section of oilhole is circle, square, rectangular, circular arc.

3, new type vibration isolator piston as claimed in claim 1 is characterized in that the upper end of described piston jacket is open shape, and promptly diameter is bigger slightly than the bottom.