JPH0471846U

JPH0471846U -

Info

Publication number: JPH0471846U
Application number: JP11505290U
Authority: JP
Priority date: 1990-10-30
Filing date: 1990-10-30
Publication date: 1992-06-25
Anticipated expiration: 2005-10-30
Also published as: JPH0749105Y2

Description

[Brief explanation of the drawing]

第１図は、この考案に係るオートテンシヨナの
一実施例を示す縦断正面図、第２図は同上のプラ
ンジヤとロツドの結合部を拡大して示す断面図、
第３図イ，ロ，ハは止め輪の正面図、第４図およ
び第５図は同上オートテンシヨナの他の実施例を
示す断面図、第６図は従来のオートテンシヨナを
示す縦断正面図である。１……シリンダ、３……プランジヤ、４……凹
所、５……係合溝、６……テーパ面、７……ロツ
ド、８……係合溝、９……止め輪、１５……調圧
スプリング、１６……オイルシール、１７……圧
力室、１８……リザーバ室、１９……通路、２２
……チエツクバルブ、２３……テーパ面。 FIG. 1 is a longitudinal sectional front view showing an embodiment of the autotensioner according to the invention, and FIG. 2 is an enlarged sectional view showing the connecting portion between the plunger and the rod.
Figure 3 A, B, and C are front views of the retaining ring, Figures 4 and 5 are cross-sectional views showing other embodiments of the same auto-tensioner, and Figure 6 is a vertical cross-sectional view showing a conventional auto-tensioner. It is a diagram. 1... Cylinder, 3... Plunger, 4... Recess, 5... Engaging groove, 6... Tapered surface, 7... Rod, 8... Engaging groove, 9... Retaining ring, 15... Pressure regulating spring, 16... Oil seal, 17... Pressure chamber, 18... Reservoir chamber, 19... Passage, 22
...Check valve, 23...Tapered surface.

Claims

[Scope of utility model registration request]

A plunger is inserted into the cylinder with the required leak clearance, and the upper part of the rod that moves in the axial direction together with the plunger is passed through an oil seal attached to the upper opening of the cylinder so that it protrudes outside the cylinder. Hydraulic oil is put into a pressure chamber formed below and a reservoir chamber provided above the plunger, and these two chambers are communicated through a passage formed in the plunger so that the pressure in the pressure chamber is higher than the pressure in the reservoir chamber. In a hydraulic autotensioner, a check valve is provided to open the passage when the rod becomes low, and a pressure regulating spring is installed in the cylinder to apply an outward biasing force to the rod. A recess into which the lower part of the rod fits loosely is formed, and an engaging groove is formed on the inner peripheral surface of this recess and the outer peripheral surface of the rod, and the upper end surface of the plunger side engaging groove and the bottom of the rod side engaging groove are formed. at least one of the end faces is a tapered surface that slopes outward;
A hydraulic autotensioner characterized in that a retaining ring having elasticity in the radial direction is fitted between a pair of engagement grooves to press the tapered surface and press the lower end of the rod against the bottom surface of the recess.