Variable valve-timing device

Details Variable valve-timing device Variable valve-timing device

1990-06-13

1991-06-25

Myhre, Charles J.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9015, F01L 134

Patent

active

050257617

ABSTRACT:
A variable valve-timing device for an intake or exhaust valve in a cylinder head of an internal combustion engine operated directly from a camshaft includes a low speed rocker arm mounted on a low speed rocker arm shaft and a high speed rocker arm mounted on a high speed rocker arm shaft. The low speed rocker arm and the high speed rocker arm are interconnected by a pin. A low speed cam is provided on the camshaft corresponding with the low speed rocker arm. A high speed cam is provided on the camshaft corresponding with the high speed rocker arm. The low speed rocker arm shaft and the high speed rocker arm shaft have a common fluted shaft. An outer circular hollow shaft is provided on the common fluted shaft and the low speed rocker arm is mounted on the outer circular hollow shaft. An outer hollow eccentric shaft having a slot with a cross section corresponding to the common fluted shaft is provided on the common fluted shaft and the high speed rocker arm is mounted on the eccentric shaft which is rotatably mounted on the engine head. An end of the fluted shaft is provided with a worm wheel meshed with a worm mounted to an output shaft of a driving device.

REFERENCES:
patent: 4397270 (1983-08-01), Aoyama
patent: 4438736 (1984-03-01), Hara et al.
patent: 4526142 (1985-07-01), Hara et al.
patent: 4643141 (1987-02-01), Bledsoe
patent: 4724822 (1988-02-01), Bonvallet
patent: 4768475 (1988-09-01), Ikemura

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