Pressure limiting hydraulic tappet

Details Pressure limiting hydraulic tappet Pressure limiting hydraulic tappet

1980-12-31

1983-08-02

Feinberg, Craig R.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9057, F01L 134, F01L 124

Patent

active

043959792

ABSTRACT:
A pressure limiting expandable hydraulic tappet is provided for use in an internal combustion engine to selectively vary timing by altering the effective profile of a camshaft. The tappet expands to extend the drive train between the camshaft and a camshaft operated mechanism by enlarging and filling an internal hydraulic chamber with a noncompressible hydraulic fluid via an inlet port. The fluid is retained in the tappet chamber by a control valve until a predetermined pressure is attained, when the valve control opens to exit the pressurized fluid through the inlet port and maintain said predetermined pressure for the duration of the camshaft stroke. The valve control means is responsive to the hydraulic pressure acting on an area differential within the chamber to overcome a selected bias.

REFERENCES:
patent: 2006641 (1935-07-01), Johnson
patent: 2309740 (1943-02-01), Voorhies
patent: 2833257 (1958-05-01), Lengnick
patent: 2940433 (1960-06-01), Randol
patent: 3385274 (1968-05-01), Shunta et al.

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