Readily-fillable hydraulic valve lifter assembly

Details Readily-fillable hydraulic valve lifter assembly Readily-fillable hydraulic valve lifter assembly

2006-10-10

2006-10-10

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Tappet

C123S090160, C123S090480, C123S090570

Reexamination Certificate

active

07117833

ABSTRACT:
A hydraulic valve lifter including venting means to assure venting of air through the lifter and filling thereof with oil during pre-start filling of the engine oil galleries after engine assembly. Patterning of a hemispherical pushrod seat surface, and/or patterning of either or both of the mating surfaces of a pushrod seat and a piston, permits air purged from the engine through a pushrod to be vented through the lifter. Such means may be temporary or permanent and may include coatings of the surfaces with materials that are destroyed by engine action after starting. Permanent means may include surface grooves in the mating surfaces and/or small-diameter passages between the hemispherical seat surface and the cylindrical outer surface of the pushrod seat. Venting means in accordance with the invention is useful for both valve-deactivating and non-valve-deactivating valve lifters.

REFERENCES:
patent: 4457270 (1984-07-01), Kodama et al.
patent: 4463714 (1984-08-01), Nakamura
patent: 6247433 (2001-06-01), Faria et al.
patent: 6578535 (2003-06-01), Spath et al.
patent: 6595174 (2003-07-01), Schnell
patent: 6606972 (2003-08-01), Wenisch et al.
patent: 2005/0056246 (2005-03-01), Itoafa

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