Valve train with lash/compliance compensation

Details Valve train with lash/compliance compensation Valve train with lash/compliance compensation

1990-04-11

1991-02-26

Myhre, Charles J.

Internal-combustion engines

Poppet valve operating mechanism

Tappet

123 9055, 123 906, 74567, 74569, F01L 114, F01L 124, F01L 108

Patent

active

049953532

ABSTRACT:
Modified cams and cam followers are designed to remove lash arising from clearances and compliance in valve train components. The cam followers have a crowned cam contacting surface having a crest, and the cams have a relief formed in a part of the base circle opposite the lift profile. The relief extends across the area opposed to the crest so that the region of the relief, the cam engages the follower in a path offset from and lower than the crest. The cam regions remote from the relief contact the follower on the crest. When the cam moves from the offset contact to the crest contact the valve train will be compressed just enough to remove the compliance prior to lift profile engagement. If any lash is present, it is also removed by the same action.

REFERENCES:
patent: 2272074 (1942-02-01), Voorhies
patent: 2624324 (1953-01-01), Russell
patent: 2668524 (1954-02-01), Randol
patent: 4638772 (1987-01-01), Burandt
patent: 4807575 (1989-02-01), Litwinchuk et al.
patent: 4850311 (1989-07-01), Sohn
patent: 4852527 (1989-08-01), Beardmore et al.
patent: 4869215 (1989-09-01), Parsons

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