Lash adjusted for engine valve actuator assembly

Details Lash adjusted for engine valve actuator assembly Lash adjusted for engine valve actuator assembly

1991-02-01

1992-02-18

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

Tappet

123 9049, F01L 124

Patent

active

050884581

ABSTRACT:
A valve damping piston and a cam follower piston have telescopic sliding fits in opposite ends of a through-bore in the lifter housing. A pressure chamber is cooperatively defined within the housing between the two pistons, and is communicated to the engine oil supply. A lash adjusting piston has a telescopical sliding fit with the exterior axial end of the damping piston, and the two cooperatively define between themselves a lash adjusting chamber. The lash adjusting chamber is communicated to the pressure chamber by an axial segment of the telescopic sliding fit of the damping piston to the housing. The clearance provided by this axial segment creates a flow restriction that results in the pressure in the lash adjusting chamber being appreciably lower, 50% for example, than the pressure in the pressure chamber. The damping piston contains a circumferential groove that is directly communicated to the termination of the axial segment. A radial and then an axial hole in the damper piston communicate the groove to the lash adjusting chamber. 00

REFERENCES:
patent: 3921609 (1975-11-01), Rhoads
patent: 4164917 (1979-08-01), Glasson
patent: 4463714 (1984-08-01), Nakamura
patent: 4530320 (1985-07-01), Ferrero
patent: 4796573 (1989-01-01), Wakeman et al.
patent: 4867113 (1989-09-01), Pieprzak et al.
patent: 4881499 (1989-11-01), Dietrich et al.
patent: 4917059 (1990-04-01), Umeda
patent: 4941438 (1990-07-01), Muto

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