Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1990-10-05
1991-09-10
Okonsky, David A.
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9039, F01L 134
Patent
active
050464620
ABSTRACT:
A rocker arm is pivotally mounted on a rocker shaft. A first cam follower such as a roller is provided on the rocker arm and arranged to cooperate with a low speed cam. A second cam follower is reciprocally mounted on the rocker arm and arranged to cooperate with a high speed cam. A locking arrangement for selective locking the second cam follower in place comprises three plungers which are each reciprocatively received in their own bore. One of the bores is formed in the second cam follower while the other two are formed in the rocker arm. When hydraulic pressure is applied to one end of one of the plungers and the high and low speed cam followers are in engagement with the base circles of the respective high and low speed cams, the plungers are axialy displaced against a return spring in a manner two project into an adjacent bore and induce interlocking.
REFERENCES:
patent: 4151817 (1979-05-01), Mueller
patent: 4768467 (1988-09-01), Yamada et al.
patent: 4768475 (1988-09-01), Ikemura
patent: 4844023 (1989-07-01), Konno et al.
patent: 4901685 (1990-02-01), Fukuo et al.
Matayoshi Yutaka
Muranaka Shigeo
Nakamura Makoto
Sakuragi Shigeru
Lo Weilun
Nissan Motor Co,. Ltd.
Okonsky David A.
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