Hydraulic tappets

Details Hydraulic tappets Hydraulic tappets

1997-06-11

1998-05-12

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9043, 123 9049, 123 9057, F01L 1300, F01L 116, F01L 1245

Patent

active

057493405

ABSTRACT:
A hydraulic tappet comprises an open-ended cylinder and a piston slidably accommodated in the cylinder. One end of the piston projects out of the open end of the cylinder and engages a valve rocker. A gear mechanism is provide to effect rotation of the cylinder about its axis whilst the piston remains stationary. An oil chamber is provided within the cylinder beyond the other end of the piston. A pressurized oil space is arranged to supply oil to the chamber via a non-return valve. An oil discharge space communicates with the chamber via a pathway including an opening in the cylinder wall. The pathway is interrupted by the piston as the piston moves into the cylinder. The oil discharge space is at a pressure substantially below that of the pressurized oil space. A plurality of spaced holes is arranged in a spiral line formed in the cylinder wall but only one of the holes communicates with the oil discharge space at any one time.

REFERENCES:
patent: 3678906 (1972-07-01), Repko et al.
patent: 4546734 (1985-10-01), Kodama
patent: 4869215 (1989-09-01), Parsons
patent: 5002022 (1991-03-01), Perr
patent: 5111781 (1992-05-01), Kaku et al.
patent: 5419290 (1995-05-01), Hurr et al.

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