Metering valve for ball plunger or pushrod socket

Details Metering valve for ball plunger or pushrod socket Metering valve for ball plunger or pushrod socket

1997-06-23

1999-01-05

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

Lubrication

123 9043, 123 9049, 123 9055, 123 9035, F01L 116, F01L 124, F01L 910

Patent

active

058551913

ABSTRACT:
A hydraulic lash adjuster of the type including a ball plunger (61) defining a passage (63), or a body portion (85) defining a passage (87). A metering valve is disposed in the passage, and in accordance with the invention (FIGS. 2-4), a shank portion (77) of the metering pin (73) defines a metering passage (81). During normal operation, pressure in the low pressure chamber (21) biases the metering pin (73) upward, to a position in which fluid can flow from the chamber (21), through the metering passage (81), to the external surface (71) of the ball plunger (61). When pressure in the chamber (21) is very low, or negative, a head portion (75) is disposed against a seat (69) in the manner of a check valve. The up and down movement of the pin (73) prevents the metering passage (81) from becoming plugged with contaminants.

REFERENCES:
patent: 3587539 (1971-06-01), Dadd
patent: 4004558 (1977-01-01), Scheibe
patent: 4184464 (1980-01-01), Svihlik
patent: 5622147 (1997-04-01), Edelmayer

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