Internal-combustion engines – Poppet valve operating mechanism – Rod
Patent
1996-09-25
1998-09-15
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
Rod
123 9063, F01L 114
Patent
active
058064788
ABSTRACT:
A push rod is constructed with a self-contained lash take-up spring and auxiliary oil pumping assembly inserted at an end of the rod body and includes an end part slidably mounted relative to the rod body and a biasing spring that urges the end part axially to extend the push rod length to take up the play of normal lash in a valve actuator of an internal combustion engine. Axial movement of the end part is constrained between a yielding maximum extension of the push rod under spring bias and a non-yielding minimal working rod length in which the end part movement is stopped against an end of the rod body for pushing open the engine valve in reaction to cam and tappet movements. Reciprocation of the end piece relative to the rod body causes localized oil pumping action that delivers enhanced oiling through the rod body to the valve actuator parts.
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patent: 4453505 (1984-06-01), Holtzberg et al.
patent: 4602597 (1986-07-01), Rhoads
patent: 5154145 (1992-10-01), Blane
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