Compression ratio changing device using an eccentric bearing for

Details Compression ratio changing device using an eccentric bearing for Compression ratio changing device using an eccentric bearing for

1986-07-30

1988-01-26

Wolfe, Jr., Willis R.

Internal-combustion engines

Four-cycle

Variable clearance

123 78E, 123 48B, F02B 7504

Patent

active

047210737

ABSTRACT:
A compression ratio changing device for an internal combustion engine using an eccentric bearing interposed between a piston-pin and a connecting rod. A lock hole is formed in the eccentric bearing and a lock-pin hole is formed in the connecting rod. A lock-pin is slidably inserted in the lock-pin hole and can move into or out of the lock hole. When the lock-pin engages lock hole, the rotation of the eccentric bearing is locked. When the lock-pin moves apart from the lock hole, the rotation of the eccentric bearing becomes free. To obtain a smooth entry of the lock-pin into the lock hole, a guide groove is formed in the outer portion of the eccentric bearing. A portion of the surface of the lock hole forms a colliding surface for colliding with the lock-pin. A deformation absorbing groove is formed at the outer portion of the colliding surface. The deformation absorbing groove absorbs a deformation of the eccentric bearing which may occur when the lock-pin is insufficiently driven toward the lock hole and the load of collision is large. Such a deformation absorbing groove increases the reliability of the operation of the compression ratio changing device.

REFERENCES:
patent: 1386114 (1921-08-01), Jedrzykowski
patent: 2029169 (1936-01-01), Hironaka
patent: 2060221 (1936-11-01), King
patent: 3004810 (1961-10-01), King
patent: 3633552 (1972-01-01), Huber
patent: 4254743 (1981-03-01), Reid et al.

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