JPH0466448U

JPH0466448U -

Info

Publication number: JPH0466448U
Application number: JP10986990U
Authority: JP
Priority date: 1990-10-19
Filing date: 1990-10-19
Publication date: 1992-06-11

Description

[Brief explanation of the drawing]

第１図は、本考案の一実施例における動弁系の
構成図、第２図は、同実施例におけるオートテン
シヨナの断面図、第３図は、同実施例におけるオ
ートテンシヨナ断面の一部の拡大図、第４図ａは
、上記実施例におけるロツドの突出量の時間変化
を示す特性図、第４図ｂは、従来オートテンシヨ
ナにおけるロツドの突出量の時間変化を示す特性
図、第５図は、従来の動弁系の構成図である。１……クランクシヤフトスプロケツト、３……
オイルポンプスプロケツト、５……アイドラプー
リ、７……カムシヤフトスプロケツト、１０……
オートテンシヨナ、１１……シリンダ、１１ａ…
…第１油室、１１ｂ……第２油室、１１ｃ……連
通路、１１ｄ……隙間、１２……ピストン、１３
……ロツド、１３ａ……貫通孔、１４……スプリ
ング、１２ａ，１２ａ′，１２ａ″……孔、１５
……チエツクバルブ、１５ａ……バルブシート、
１５ａ′……突出部、１５ｂ……キヤツプ、１５
ｃ……チエツクボール、１５ｄ……バルブシート
面、１５ｅ……バネ、１６……オイルシール、１
７……リザーバ室、２０……テンシヨナプーリ、
２２……テンシヨナアーム、２４……軸、３０…
…タイミングベルト、Ｒ_１……正転方向（運転時
回転方向）、Ｒ_２……逆転方向。 FIG. 1 is a configuration diagram of a valve train in an embodiment of the present invention, FIG. 2 is a sectional view of an autotensioner in the same embodiment, and FIG. 3 is a cross-sectional view of an autotensioner in the same embodiment. FIG. 4a is a characteristic diagram showing changes over time in the amount of protrusion of the rod in the above embodiment, FIG. 4b is a characteristic diagram showing changes over time in the amount of protrusion of the rod in the conventional autotensioner, FIG. 5 is a configuration diagram of a conventional valve train system. 1...Crankshaft sprocket, 3...
Oil pump sprocket, 5... Idler pulley, 7... Camshaft sprocket, 10...
Auto tensioner, 11... cylinder, 11a...
...First oil chamber, 11b...Second oil chamber, 11c...Communication path, 11d...Gap, 12...Piston, 13
... Rod, 13a ... Through hole, 14 ... Spring, 12a, 12a', 12a'' ... Hole, 15
...Check valve, 15a...Valve seat,
15a'...protrusion, 15b...cap, 15
c...Check ball, 15d...Valve seat surface, 15e...Spring, 16...Oil seal, 1
7... Reservoir chamber, 20... Tension pulley,
22...Tensioner arm, 24...Axis, 30...
...Timing belt, _R1 ...Forward rotation direction (rotation direction during operation), _R2 ...Reverse direction.

Claims

[Scope of Claim for Utility Model Registration] A timing belt that is wrapped around at least a cam sprocket connected to a camshaft of a valve train and a crank sprocket connected to a crankshaft, and a timing belt that is swingably attached to an engine side. a tensioner arm, a tensioner pulley that is freely rotatably supported by the tensioner arm and can press against the slack side of the timing belt during engine rotation; has a liquid-tight space inside and is filled with oil; A cylinder; A piston that is fitted into the space of the cylinder and can freely move in the axial direction; First and second oil chambers formed by partitioning the space by the piston; and The first oil chamber connected to the piston. a bar-shaped rod extending in the axial direction within the chamber and penetrating the cylinder body in a fluid-tight manner and being engaged with the tensioner arm; A biasing means for biasing the piston in the direction of increasing pressure, and a hole formed in the piston and allowing the two oil chambers to communicate with each other only when the piston is biased by the biasing means and moves. In an autotensioner device equipped with an autotensioner main body, a communication path is formed in the cylinder to communicate the two oil chambers so as to bypass the piston in a predetermined movement stroke, and the rod is removed when the engine is started. An autotensioner device characterized in that it is configured to prevent hunting.