Controllable hydraulic valve operating mechanism

Details Controllable hydraulic valve operating mechanism Controllable hydraulic valve operating mechanism

1997-05-19

1998-06-16

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

137906, 251 25, F01L 902

Patent

active

057655154

ABSTRACT:
In a hydraulic operating mechanism for a valve which comprises a valve stem with first spring means acting on the valve stem in the valve closing direction, and second spring means acting at least intermittently on the valve stem in a valve opening direction, the compressing force of the second spring means is controlled hydraulically during the operation of the valve control device. In order to keep the control forces required for operating the valve as low as possible over its entire operating range, the second spring means comprises a spring combination composed of at least two springs which have different spring forces providing for a maximum spring force of the second spring means at the start of the valve opening stroke.

REFERENCES:
patent: 5193495 (1993-03-01), Wood, III
patent: 5248123 (1993-09-01), Richeson et al.
patent: 5595148 (1997-01-01), Letsche et al.

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