JPS61192531U

JPS61192531U -

Info

Publication number: JPS61192531U
Application number: JP7632385U
Authority: JP
Priority date: 1985-05-24
Filing date: 1985-05-24
Publication date: 1986-11-29
Also published as: JPH0426663Y2

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例に係る偏心ベアリン
グのロツク機構の偏心ベアリング近傍の断面図、
第２図は第１図の機構へのオイル供給系の断面図
、第３図は第２図と直角方向の断面図、第４図は
第２図および第３図の系へのオイル供給の低、高
圧縮比における切換回路の系統図、第５図はオイ
ル供給系路の斜視図、第６図はピストン位置とク
ランク角度との関係で示したピストン軌跡図、で
ある。１…シリンダ、２…ピストン、３…コネクテイ
ングロツド、４…ピストンピン、５…ピストンピ
ン挿通孔、６…偏心ベアリング、７…ロツクピン
収納穴、８…ロツクピン、９…ロツクピン係合孔
、１０…溝、１１…ロツクピンロツク用油圧通路
、１２…ロツクピンアンロツク用油圧通路、１３
，１４，１７，１８…油溝、１５…クランクシヤ
フト、１６…油通路、１９…高圧縮比用メインオ
イル通路、２０…低圧縮比用メインオイル通路、
２６…切換弁。 FIG. 1 is a sectional view of a locking mechanism for an eccentric bearing in the vicinity of the eccentric bearing according to an embodiment of the present invention;
Figure 2 is a cross-sectional view of the oil supply system to the mechanism in Figure 1, Figure 3 is a cross-sectional view perpendicular to Figure 2, and Figure 4 is a cross-sectional view of the oil supply system to the system in Figures 2 and 3. FIG. 5 is a system diagram of the switching circuit at low and high compression ratios, FIG. 5 is a perspective view of the oil supply line, and FIG. 6 is a piston locus diagram showing the relationship between piston position and crank angle. 1...Cylinder, 2...Piston, 3...Connecting rod, 4...Piston pin, 5...Piston pin insertion hole, 6...Eccentric bearing, 7...Lock pin storage hole, 8...Lock pin, 9...Lock pin engagement hole, 10 ... Groove, 11... Hydraulic passage for lock pin locking, 12... Hydraulic passage for lock pin unlocking, 13
, 14, 17, 18...oil groove, 15...crankshaft, 16...oil passage, 19...main oil passage for high compression ratio, 20...main oil passage for low compression ratio,
26...Switching valve.

Claims

[Scope of utility model registration request]

An eccentric bearing is rotatably interposed between the piston pin and the connecting rod, and a lock pin provided on the connecting rod side is driven to engage or engage with a lock pin engagement hole provided in the eccentric bearing. In a locking mechanism for an eccentric bearing in a variable compression ratio mechanism in which rotation of the eccentric bearing is locked or unlocked by removing the lock pin, the driving direction of the lock pin is set to be approximately perpendicular to the center line of the connecting rod. An eccentric bearing locking mechanism characterized by the following: