JPS6269041U

JPS6269041U -

Info

Publication number: JPS6269041U
Application number: JP15994585U
Authority: JP
Priority date: 1985-10-21
Filing date: 1985-10-21
Publication date: 1987-04-30

Description

[Brief explanation of the drawing]

第１図は本考案の第１実施例に係る圧縮比可変
機構のコネクテイングロツド小端部近傍の縦断面
図であつて高圧縮比状態を示し縦断面図、第２図
は第１図の装置の低圧縮比状態を示した縦断面図
、第３図は第２図の―線に沿う断面図、第４
図は第２図の―線に沿う断面図、第５図は第
一実施例の変形例を示した部分断面図、第６図は
本考案の第２実施例に係る圧縮比可変機構のコネ
クテイングロツド小端部近傍の縦断面図であつて
、高圧縮比状態を示した縦断面図、第７図は従来
の圧縮比可変機構の全体断面図、第８図は第７図
の圧縮比可変機構の偏心ベアリング近傍の拡大断
面図、である。１１……コネクテイングロツド、１２……ピス
トンピン、１３……偏心ベアリング、１６……ロ
ツク孔、１８，３０……突起部、１８ａ，１８ｂ
，３０ａ，３０ｂ……突起部の回転方向の端部、
２１ａ，２１ｂ，３１……偏心ベアリングのスト
ツパ部、２２……ロツクピン、２３……ロツクピ
ン孔、２６……緩衝部材。 FIG. 1 is a vertical cross-sectional view of the vicinity of the small end of the connecting rod of the variable compression ratio mechanism according to the first embodiment of the present invention, showing a high compression ratio state, and FIG. Fig. 3 is a longitudinal cross-sectional view showing the low compression ratio state of the device;
The figure is a sectional view taken along the line - in Fig. 2, Fig. 5 is a partial sectional view showing a modification of the first embodiment, and Fig. 6 is a connector of the variable compression ratio mechanism according to the second embodiment of the present invention. 7 is a longitudinal sectional view of the vicinity of the small end of the bearing rod, showing a high compression ratio state; FIG. 7 is an overall sectional view of a conventional variable compression ratio mechanism; and FIG. 8 is the compression ratio shown in FIG. FIG. 3 is an enlarged sectional view of the vicinity of the eccentric bearing of the variable ratio mechanism. 11...Connecting rod, 12...Piston pin, 13...Eccentric bearing, 16...Lock hole, 18, 30...Protrusion, 18a, 18b
, 30a, 30b... end of the protrusion in the rotational direction,
21a, 21b, 31...Eccentric bearing stopper portion, 22...Lock pin, 23...Lock pin hole, 26...Buffer member.

Claims

[Scope of utility model registration request]

An eccentric bearing is interposed between the piston pin and the connecting rod, the compression ratio is varied by rotation of the eccentric bearing, a lock hole is formed in the eccentric bearing, and a lock pin hole is formed in the connecting rod, In a compression ratio variable mechanism in which a compression ratio position is fixed by driving a lock pin by hydraulic pressure from a hydraulic path provided in a connecting rod and engaging a lock hole, a compression ratio variable mechanism is provided, in which a lock pin is driven by hydraulic pressure from a hydraulic path provided in a connecting rod and the compression ratio position is fixed. A protrusion is provided on the inner periphery of the hole in which the eccentric bearing of the connecting rod is inserted, and the protrusion is provided at a position where the lock pin hole and the piston pin hole coincide and at a position a half turn from the said position. A compression ratio variable mechanism characterized by having a stopper part of an eccentric bearing that comes into contact with the end part in the rotation direction.