Device for actuating the valves in internal combustion engines b

Details Device for actuating the valves in internal combustion engines b Device for actuating the valves in internal combustion engines b

1995-10-11

1997-02-11

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9017, 123 906, F01L 108, F01L 112, F01L 1300

Patent

active

056010567

ABSTRACT:
A device for actuating a valve in an internal combustion engine consists of a casing and a cam mechanism including a cam which is rotatably joined to the casing. The cam engages a tappet at a cam/tappet interface and the tappet engages a output link at a tappet/drive link interface. During cam rotation, the cam causes an acceleration to occur in the output link. The drive link moves alternately in either of two directions and is operably disposed within the casing so that the drive link transmits its motion to the valve. The cam is shaped such that in the interval between valve closure and reopening, the acceleration transmitted by the cam, at the cam/tappet interface in normal direction, is substantially constant and is directed away from the cam. During portions of the cycle of operation, the various mechanical links are kept in contact solely by the effect of inertial force thereby reducing the need for additional springs, such as commonly used to maintain contact between the intermediate link or tappet and the cam. A support element or stop engages the output link during valve closure such that the drive link does not engage the tappet at the tappet/drive link interface. This provides more linear acceleration and enhanced lubrication at the tappet/drive link interface during engine operation.

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patent: 4572118 (1986-02-01), Baguena
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patent: 4942854 (1990-07-01), Shirai et al.
patent: 5119773 (1992-06-01), Schon et al.
patent: 5165370 (1992-11-01), Beaumont
patent: 5189998 (1993-03-01), Hara

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