JPS61183433U

JPS61183433U -

Info

Publication number: JPS61183433U
Application number: JP6733385U
Authority: JP
Priority date: 1985-05-09
Filing date: 1985-05-09
Publication date: 1986-11-15
Also published as: JPH0426669Y2

Description

[Brief explanation of drawings]

第１図は本考案の可変圧縮比機構を示す断面図
、第２図は第１図の線Ａ―Ａ断面図で一方のロク
ピンのロツク状態を示し、第３図は第１図の線Ｂ
―Ｂ断面図であり偏心軸受は第２図と同じ円周方
向の位置にあり、他方のロツクピンの非ロツク状
態を示し、第４図は一方のロツクピンが非ロツク
位置にある場合の第２図と対応する第１図Ａ―Ａ
断面図、第５図は他方のロツクピンがロツク位置
にある場合の第３図と対応する第１図Ｂ―Ｂ断面
図、第６図は第２図線Ｃ―Ｃ断面図である。４……ピストンピン、６……コネクテイングロ
ツド、７……偏心軸受、１１，１２……ロツクピ
ン、１２，２２……油圧室、１３，２３……案内
溝、１４，２４……ロツク孔、１５，１６，２５
，２６……オイル通路。 Fig. 1 is a sectional view showing the variable compression ratio mechanism of the present invention, Fig. 2 is a sectional view taken along line AA in Fig. 1 and shows the locked state of one locking pin, and Fig. 3 is a sectional view taken along line B in Fig. 1.
-B sectional view, the eccentric bearing is at the same circumferential position as in Fig. 2, and the other lock pin is in the unlocked state, and Fig. 4 is Fig. 2 with one lock pin in the unlocked position. Figure 1 A-A corresponding to
5 is a sectional view taken along the line CC in FIG. 2, and FIG. 6 is a sectional view taken along the line CC in FIG. 2, which corresponds to FIG. 4... Piston pin, 6... Connecting rod, 7... Eccentric bearing, 11, 12... Lock pin, 12, 22... Hydraulic chamber, 13, 23... Guide groove, 14, 24... Lock hole , 15, 16, 25
, 26...Oil passage.

Claims

[Claims for Utility Model Registration] 1. At least one of the shaft supports at both ends of a connecting rod of an internal combustion engine is provided with an eccentric bearing that makes the bearing hole of the connecting rod and the support shaft inserted through the bearing hole eccentric with respect to each other. A variable compression ratio mechanism for an internal combustion engine, comprising a hydraulic lock mechanism capable of fixing the eccentricity of the eccentric bearing at at least two positions in the rotational direction of the eccentric bearing. 2. The hydraulic locking mechanism includes at least two hydraulically driven locking pins spaced apart in the circumferential and axial directions of the eccentric bearing and movable in the radial direction. variable compression ratio mechanism. 3. The variable compression ratio mechanism according to claim 2, wherein each lock pin can be inserted into a radial lock hole of a corresponding eccentric bearing from the connecting rod side.