Valve operating device for internal combustion engine

Details Valve operating device for internal combustion engine Valve operating device for internal combustion engine

1994-08-18

1995-10-10

Yuen, Henry C.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9044, F01L 1300

Patent

active

054562252

ABSTRACT:
A valve operating device for use in an internal combustion engine for varying operating characteristics of a pair of engine valves (20) in multi-stages depending upon operating conditions of the engine. A cam shaft (31) is provided with a high-speed cam (32), a pair of medium-speed cams disposed on opposite sides of the high-speed cam (32), and a pair of low-speed cams (34) disposed between the medium-speed cams (33) and the high-speed cam (32). A rocker shaft (35) is provided with a first free rocker arm (36) in sliding contact with the high-speed cam (32), a pair of driving rocker arms (37) operatively connected to the pair of engine valves (20), respectively, and in sliding contact with the low-speed cams (34), and a pair of second free rocker arms (38) disposed with the driving rocker arms (37) interposed between the second free rocker arms (38) and the first free rocker arm (36) to be in sliding contact with the medium-speed cams (33). First and second connection switching means (39, 40) are provided and separately switchable between states for selectively connecting the various rocker arms for operating the driving rocker arms (37) and engine valves (20) in low-speed, medium-speed and high-speed operating ranges of the engine.

REFERENCES:
patent: 4799463 (1989-01-01), Konno
patent: 5085182 (1992-02-01), Nakamura et al.
patent: 5095859 (1992-03-01), Iwata et al.

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