Valve operating system for engine

Details Valve operating system for engine Valve operating system for engine

1991-11-22

1994-01-04

Kamen, Noah P.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

F01L 134

Patent

active

052751376

ABSTRACT:
A valve operating system for an engine includes a cam shaft and first and second cams, mounted on the cam shaft, which are selectively utilized to provide different valve opening characteristics in accordance with a vehicle operating condition. A first rocker arm follows the first cam and engages a valve stem of a valve to operate the valve, and a second rocker arm follows the second cam at a position not interfering with the valve stem. A connecting device connects the first and second rocker arms so that they move together, and a control device controls the connecting means to connect the first and second rockers in accordance with the vehicle operating condition so that the valve opening characteristic is defined by a cam profile of the second cam which is larger than that of the first cam. When the first and second rocker arms are engaged with each other, the valve opening period is increased to reduce pumping loss in the engine under relatively low engine load.

REFERENCES:
patent: 4854272 (1989-08-01), Konno
patent: 4995281 (1991-02-01), Allor et al.
patent: 5009203 (1991-04-01), Seki
patent: 5010856 (1991-04-01), Ojala
patent: 5060604 (1991-10-01), Seki et al.

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