JPS6373544U

JPS6373544U -

Info

Publication number: JPS6373544U
Application number: JP16659586U
Authority: JP
Priority date: 1986-10-31
Filing date: 1986-10-31
Publication date: 1988-05-17
Also published as: JPH048275Y2

Description

[Brief explanation of the drawing]

第１図は本考案の第１実施例に係る偏心ベアリ
ングのロツク機構における偏心ベアリングのロツ
ク状態を示す断面図、第２図は第１図の装置にお
ける偏心ベアリングのアンロツク状態を示す断面
図、第３図は第１図の―線に沿う断面図、第
４図は第１図の偏心ベアリングの拡大断面図、第
５図は第４図の正面図、第６図は本考案の第２実
施例に係る偏心ベアリングのロツク機構における
偏心ベアリングのアンロツク状態を示す断面図、
第７図は従来の可変圧縮比機構の一例を示す断面
図、第８図は第７図の―線に沿う断面図、で
ある。１１……シリンダ、１２……ピストン、１３…
…コネクテイングロツド、１４……ピストンピン
、１５……小端孔、１６……偏心ベアリング、１
７，４１……ロツクピン収納穴、１８，４２……
ロツクピン、１９……ロツク溝、１９ａ……衝突
壁、１９ｂ……溝底、２１……ロツクピンロツク
用油圧通路、２２……ロツクピンアンロツク用油
圧通路、２３，２４，２７，２８……油溝、２５
……クランクシヤフト、２６……油孔、２９……
高圧縮比制御用油圧通路、３０……低圧縮比制御
用油圧通路、３３……大端部、３６……切換弁、
Ａ……コネクテイングロツド中心線、Ｂ……偏心
ベアリングの回転中心を通る軸線、Ｄ……偏心ベ
アリングの回転方向。 1 is a sectional view showing the locked state of the eccentric bearing in the eccentric bearing locking mechanism according to the first embodiment of the present invention; FIG. 2 is a sectional view showing the unlocked state of the eccentric bearing in the device of FIG. 1; Figure 3 is a sectional view taken along the line - in Figure 1, Figure 4 is an enlarged sectional view of the eccentric bearing in Figure 1, Figure 5 is a front view of Figure 4, and Figure 6 is a second implementation of the present invention. A sectional view showing an unlocked state of an eccentric bearing in an eccentric bearing locking mechanism according to an example;
FIG. 7 is a sectional view showing an example of a conventional variable compression ratio mechanism, and FIG. 8 is a sectional view taken along the line - in FIG. 11...Cylinder, 12...Piston, 13...
... Connecting rod, 14 ... Piston pin, 15 ... Small end hole, 16 ... Eccentric bearing, 1
7, 41... Lock pin storage hole, 18, 42...
Lock pin, 19... Lock groove, 19a... Collision wall, 19b... Groove bottom, 21... Hydraulic passage for lock pin locking, 22... Hydraulic passage for lock pin unlocking, 23, 24, 27, 28... Oil groove, 25
...Crankshaft, 26...Oil hole, 29...
Hydraulic passage for high compression ratio control, 30...Hydraulic passage for low compression ratio control, 33...Big end, 36...Switching valve,
A... Connecting rod center line, B... Axis line passing through the center of rotation of the eccentric bearing, D... Rotation direction of the eccentric bearing.

Claims

[Claims for Utility Model Registration] (1) An eccentric bearing is rotatably interposed between the inner periphery of the small end hole of the connecting rod and the outer periphery of the piston pin, and the eccentric bearing is provided on the connecting rod side. A locking mechanism for an eccentric bearing in a variable compression ratio mechanism, wherein a lock pin is slidably stored in a lock pin housing hole, and the eccentric bearing is locked or unlocked by hydraulically driving the lock pin. The storage hole is arranged in the tangential direction of the inner circumference of the small end hole of the connecting rod, and the driving direction of the lock pin when locking the eccentric bearing is set opposite to the rotating direction of the eccentric bearing. , on the outer peripheral surface of the eccentric bearing,
A locking mechanism for an eccentric bearing, characterized in that a locking groove having a collision wall with which the tip of the locking pin can come into contact is provided. (2) The eccentric bearing locking mechanism according to claim 1, wherein the lock pin housing hole is arranged perpendicularly to the center line of the connecting rod. (3) The eccentric bearing lock mechanism according to claim 1, wherein the lock pin housing hole is arranged in a direction from the small end to the large end of the connecting rod. (4) The locking mechanism for an eccentric bearing according to claim 1, wherein the locking groove is provided in the thickest part of the eccentric bearing in the radial direction. (5) The eccentric bearing locking mechanism according to claim 1, wherein the groove bottom of the locking groove is formed in the same shape as the outer peripheral surface of the locking pin. (6) The locking mechanism for an eccentric bearing according to claim 1, wherein the collision wall is provided on an axis passing through the center of rotation of the eccentric bearing.