JPS6236237U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of a hydraulic passage for a variable compression ratio mechanism according to the first embodiment of the present invention, Fig. 2 is a longitudinal sectional view of the entire variable compression ratio mechanism, and Fig. 3 is a vertical sectional view of the device of Fig. 2. A vertical cross-sectional view from the direction, Figure 4 is the same as in Figure 1.
A partial cross-sectional view along the line, FIG. 5 is the second part of the present invention.
A vertical sectional view of a hydraulic passage for a variable compression ratio mechanism according to an embodiment, FIG. 6 is a partial bottom view taken along the line - in FIG. 5, and FIG. 7 is a diagram for a variable compression ratio mechanism according to a third embodiment of the present invention. FIG. 8 is a perspective view of the half-split metal bearing of the device in FIG. 7, FIG. 9 is a partial sectional view taken along line - in FIG. 7, and FIG. 10 is a longitudinal sectional view of the hydraulic passage. 11 is a longitudinal sectional view of a conventional hydraulic passage for a variable compression ratio mechanism; FIG. 12 is a perspective view of a half-split metal bearing of the device shown in FIG. 11;
It is. 20... Connecting rod big end, 21...
... Connecting rod, 22 ... Crankshaft, 23, 24, 60, 61 ... Half metal bearing, 25a, 25b, 26a, 26b, 64a
, 64b, 65a, 65b...Elongated hole, 27a, 2
7b, 27c, 28a, 28b, 28c, 62a
, 62c, 63a, 63c...Bridge part, 29
a, 29b, 66a, 66b...groove, 30a, 3
0b... Hydraulic passage, 31... Hydraulic passage for lock pin locking, 32... Hydraulic passage for lock pin unlocking, 35... Lock pin, 37... Eccentric bearing, 39... Piston, 40, 42, 43...
Hydraulic passage, 41... Crank journal section, 45
...Main hydraulic passage for high compression ratio, 46...Main hydraulic passage for low compression ratio, 47a, 47b, 48a,
48b...Horizontal groove hole, 49...Cap side member, 5
0... Tightening bolt, 51... Tightening bolt hole, 52a, 52b... Vertical slot, 53... Clearance enlarged part, 54... Notch part, 67a, 67c
, 68a, 68c... Portions with increased groove depth.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A hydraulic passage for guiding hydraulic pressure for compression ratio switching is provided with a circumferentially extending elongated hole at the joint between the large end of the connecting rod and the crankshaft and at the crank journal. A hydraulic passage for a variable compression ratio mechanism of an internal combustion engine formed by a half-split metal bearing and a circumferentially extending groove provided on the inner peripheral surface of a housing member that supports the half-split metal bearing,
For a variable compression ratio mechanism, the cross-sectional area of the groove passage of the housing member is made larger at a position corresponding to the bridge part of the half-split metal bearing, which is an extension of the elongated hole, than at other groove parts. Hydraulic passage. (2) The position of the bridge portion is on the side of the tightening bolt that fastens the cap side member of the housing member, and the cross-sectional area of the passage of the groove is expanded around the tightening bolt. Hydraulic passage for the variable compression ratio mechanism described in . (3) The bridge portion is located at a position other than the position on the side of the tightening bolt that fastens the cap side member of the housing member, and the passage cross-sectional area of the groove is expanded at the position by deepening the groove. A hydraulic passage for a variable compression ratio mechanism according to claim 1 of the registered utility model.