Hydraulic cam follower

Details Hydraulic cam follower Hydraulic cam follower

2011-02-08

2011-02-08

Chang, Ching (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Tappet

C123S090160, C123S090440, C123S090520, C074S569000

Reexamination Certificate

active

07882815

ABSTRACT:
A hydraulic cam follower for simultaneous actuation of several equal-acting gas-exchange valves, especially for a tappet pushrod valve train of an engine, includes an outer part, whose base forms a cam contacting surface, and from whose head hollow-cylindrical guides extend in the same number as the valves in a direction towards the base. A housing of a hydraulic play compensation element is provided in each guide and sits with its bottom side on an inside of the bottom of the outer part. A concentric pressure piston is guided in a borehole starting from a head end of each housing so it can move axially. A non-return valve is located at a bottom-side base of the piston and a high-pressure space is formed axially between the base and the bottom side of the housing. A reservoir for hydraulic medium is formed between the base and a head end of the piston.

REFERENCES:
patent: 7284519 (2007-10-01), Best et al.
patent: 7617807 (2009-11-01), Diggs et al.
patent: 7637237 (2009-12-01), Evans et al.

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