Hydraulic lash adjuster and biased normally open check valve sys

Details Hydraulic lash adjuster and biased normally open check valve sys Hydraulic lash adjuster and biased normally open check valve sys

1997-01-30

1998-06-02

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

Lubrication

123 9036, 123 9046, 123 9055, 74569, F01L 116, F01L 124

Patent

active

057586136

ABSTRACT:
A hydraulic lash adjuster of the sealed leakdown type in which the plunger assembly (15) is received within a blind bore (13) defined by a body (11). The plunger assembly (15) includes upper (17) and lower (19) plunger elements, to define a low pressure chamber (21) and a high pressure chamber (23). In one embodiment, a dynamic seal member (27) is disposed between the lower plunger element (19) and the bore (13), such that leakdown flow must go from the high pressure chamber (23), past a check ball (53), to the low pressure chamber (21). In order to achieve a more consistent operation of the lash adjuster, the check ball (53) is normally biased toward an open position (FIG. 1) by a compression spring (69), but as flow from the chamber (23) to the chamber (21) increases, the spring force is overcome, and the check ball (53) seats in the desired manner.

REFERENCES:
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patent: 4004558 (1977-01-01), Schiebe
patent: 4054109 (1977-10-01), Herrin et al.
patent: 4633827 (1987-01-01), Buente
patent: 4721076 (1988-01-01), Goppelt et al.
patent: 4788947 (1988-12-01), Edelmayer
patent: 4807576 (1989-02-01), Sonoda et al.
patent: 5509385 (1996-04-01), LaVieri
patent: 5622147 (1997-04-01), Edelmayer
patent: 5632237 (1997-05-01), Cornell et al.

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