JPH0377046U

JPH0377046U -

Info

Publication number: JPH0377046U
Application number: JP13796589U
Authority: JP
Priority date: 1989-11-30
Filing date: 1989-11-30
Publication date: 1991-08-01

Description

[Brief explanation of drawings]

第１図は本考案を採用したエンジンの一実施例
を示す部分縦断面図であり、第２図は第１図中Ａ
−Ａ断面図である。第３図ａ，ｂは第１図中Ｂ部
拡大断面図であり、第４図は偏心ベアリングの斜
視図である。第５図ａ，ｂ，ｃと第６図ａ，ｂ，
ｃは共に実施例における作動を示す説明図である
。図中、１……クランクシヤフト、２……クラン
クジヤーナル、３……クランクピン、８……メイ
ンギヤラリ、９……第１の油通路、１１……ロツ
クバルブ、１３……ロツクピン、１５……偏心ベ
アリング、１６……コンロツド、１７……大端部
、２１……ブツシユ部、２２……フランジ部、２
３……低圧縮比用ロツク穴、２４……高圧縮比用
ロツク穴、２５……貫通穴、２８……第２の油通
路、２９，３０，３２，３３……係止穴である。 FIG. 1 is a partial vertical sectional view showing an embodiment of an engine adopting the present invention, and FIG.
-A sectional view. 3a and 3b are enlarged cross-sectional views of the section B in FIG. 1, and FIG. 4 is a perspective view of the eccentric bearing. Figure 5 a, b, c and Figure 6 a, b,
FIG. 3c is an explanatory diagram showing the operation in the embodiment. In the figure, 1...Crankshaft, 2...Crank journal, 3...Crank pin, 8...Main gear rally, 9...First oil passage, 11...Lock valve, 13...Lock pin, 15...Eccentricity Bearing, 16...Conrod, 17...Big end, 21...Bushing part, 22...Flange part, 2
3... Lock hole for low compression ratio, 24... Lock hole for high compression ratio, 25... Through hole, 28... Second oil passage, 29, 30, 32, 33... Locking hole.

Claims

[Claims for Utility Model Registration] The connecting rod is interposed between the large end of the connecting rod and the crank pin of the crankshaft, and the outer diameter side that fits into the large end and the inner diameter side that fits into the crank pin are mutually connected. An eccentric bearing consisting of an eccentric bushing part and a flange part formed in the outer circumferential direction from both ends of the bushing part along the inner surface of the large end part; A compression ratio lock hole, a low compression ratio lock hole formed in the flange portion on the side where the high compression ratio lock hole is not formed, and a low compression ratio lock hole formed in the axial direction of the crank journal of the crankshaft and connected to the main gear. a first oil passage to which engine oil pressure is supplied through the first oil passage; and a first oil passage that is disposed in the first oil passage, moves in a predetermined direction by the first set oil pressure, and fits into the high compression ratio lock hole. While fixing the eccentric bearing, the eccentric bearing is moved in the opposite direction with a second set oil pressure lower than the first set oil pressure to release the engagement with the high compression ratio lock hole and to release the eccentric bearing in the adjacent cylinder. a lock valve having a lock pin that fits into the compression ratio lock hole; a second oil passage formed within the crank pin of the crankshaft to guide hydraulic pressure from the main gear rally to the bushing portion of the eccentric bearing; and the eccentric bearing. The length of the through hole is slidably fitted into the through hole formed in the bushing portion of the bushing, and is pressed by the first set oil pressure from the second oil passage during low compression operation and moves outward in the radial direction. a longer detent pin; and a detent pin formed on the inner surface of the large end of the connecting rod, and the second set oil pressure is adjusted at a position where the lock pin is fitted into the high compression ratio lock hole or the low compression ratio lock hole. a locking hole that engages the detent pin driven by the crank pin and locks the eccentric bearing to the large end of the connecting rod; Alternatively, when fitted in the low compression ratio lock hole, the detent pin is pressed and moved by the large end of the connecting rod, and the detent pin is engaged with the detent pin, thereby locking the eccentric bearing to the crank pin. A variable compression ratio engine characterized by: