JPH03121254U

JPH03121254U -

Info

Publication number: JPH03121254U
Application number: JP3173090U
Authority: JP
Priority date: 1990-03-26
Filing date: 1990-03-26
Publication date: 1991-12-12

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
第１の実施例を示す断面図、第２図は同上の作動
状態を示す断面図、第３図は同上オートテンシヨ
ナの第２の実施例を示す断面図、第４図はベルト
伝動装置の概略図、第５図は従来のオートテンシ
ヨナを示す断面図である。１０……ボデイ、１１……シール部材、１４…
…プランジヤ、１５……第１圧力室、１６……リ
ザーバ室、１７……シリンダ室、１８……第１チ
エツクバルブ、２２……プツシユロツド、２５…
…調圧スプリング、２７……ピストン、３１……
第２チエツクバルブ、３５……弁体、３７……プ
ランジヤスプリング。 FIG. 1 is a cross-sectional view showing a first embodiment of the auto-tensioner according to the invention, FIG. 2 is a cross-sectional view showing the same operating state, and FIG. 3 is a second embodiment of the auto-tensioner described above. 4 is a schematic diagram of a belt transmission device, and FIG. 5 is a sectional diagram of a conventional autotensioner. 10...Body, 11...Seal member, 14...
...Plunger, 15...First pressure chamber, 16...Reservoir chamber, 17...Cylinder chamber, 18...First check valve, 22...Push rod, 25...
...Pressure adjustment spring, 27...Piston, 31...
Second check valve, 35...valve body, 37...plunger spring.

Claims

[Claims for Utility Model Registration] (1) A body with an opening at one end and a sealing member attached to the opening, and a slidable plunger that partitions the inside of the body into a pressure chamber and a reservoir chamber;
The plunger is made up of a push rod that penetrates the seal member and whose tip faces the outside of the body and presses the plunger when moving toward the pressure chamber, and a pressure regulating spring that is provided in the opening of the body and presses the push rod. In the hydraulic autotensioner, the plunger is provided with a check valve that allows the hydraulic oil in the pressure chamber to flow toward the reservoir chamber and prevents the flow in the opposite direction, and the plunger has a cylinder chamber. The lower end of the push rod is provided with a piston that is slidably incorporated into the cylinder chamber, and the hydraulic oil in the reservoir chamber flows into the space at the back of the piston formed by the relative movement of the piston and the push rod. A hydraulic autotensioner characterized in that the piston is provided with a check valve that allows flow in the opposite direction and prevents flow in the opposite direction. (2) The hydraulic autotensioner according to claim 1, wherein the valve body of the check valve provided on the piston is made of a plate.