Hydraulic lash adjuster and improved method of assembly thereof

Details Hydraulic lash adjuster and improved method of assembly thereof Hydraulic lash adjuster and improved method of assembly thereof

2005-09-13

2005-09-13

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Tappet

C123S090450, C029S888030

Reexamination Certificate

active

06941915

ABSTRACT:
A hydraulic lash adjuster (11) for an internal combustion engine, and an improved method of assembly of such a lash adjuster. The lash adjuster (11) is of the type having a body (13), a plunger (15), and a check valve assembly (17). In accordance with one aspect of the invention, the check valve assembly comprises a cartridge (17A;17B) comprising a member (27;41) separate from the plunger (15) and defining a valve seat (27S;41S). The check valve cartridge is capable of being assembled and tested for compliance with a predetermined relationship of flow versus pressure differential, prior to assembly into the plunger (15). In accordance with the improved method of assembly, a plurality of different bodies (13A;13B) and plungers (15A;15B;15C;15D) is provided, as well as a plurality of different, interchangeable check valve cartridges (17A;17B), and the assembly operator selects a body, a plunger, and a cartridge to provide an assembled lash adjuster having the predetermined, desired operating parameters.

REFERENCES:
patent: 3861365 (1975-01-01), Zink
patent: 5509385 (1996-04-01), LaVieri
patent: 5758613 (1998-06-01), Edelmayer et al.
patent: 5855191 (1999-01-01), Blowers et al.

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