Variable compression ratio engine with lost motion coupling

Details Variable compression ratio engine with lost motion coupling Variable compression ratio engine with lost motion coupling

2007-10-31

2009-06-16

Kamen, Noah (Department: 3747)

Internal-combustion engines

Adjustable combustion chamber

Piston in head adjusted

C123S0780BA

Reexamination Certificate

active

07546820

ABSTRACT:
A variable compression ratio piston (26) and connecting rod (18) assembly for an internal combustion engine (14) includes an eccentric bushing (28) that carries a piston pin bushing (42) and contains a journaled portion (48) held in the rod bore (24) of the connecting rod (18). The eccentric bushing (28) can be selectively rotated between either of two angle adjusted positions to effect a change in the height of the piston (26) relative to the connecting rod (18), and thus change the compression ratio of the assembly. A latch (50) mechanism is actuated by oil jets (90, 91) external to the connecting rod (18). The latch (50) includes bolts (54, 56) with tapered tips that seat in oblong holes (60, 62) in a flange plate (58) to reduce destructive lash. A resilient stop post (80) bears the brunt of stresses associated with stopping the flange plate (58) during switching events to protect the latching bolts (54, 56).

REFERENCES:
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patent: 2427668 (1947-09-01), Gill
patent: 4687348 (1987-08-01), Naruoka et al.
patent: 4864975 (1989-09-01), Hasegawa
patent: 5417185 (1995-05-01), Beattie
patent: 6499446 (2002-12-01), Rao et al.
patent: 7469663 (2008-12-01), Berger
patent: 438121 (1991-07-01), None
patent: 412781 (1934-07-01), None

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