Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1997-11-18
1998-12-08
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9044, F01L 1300
Patent
active
058456147
ABSTRACT:
A valve operating system includes a connection switch-over device provided in a plurality of cam followers. The connection switch-over device has a piston moved in response to a change in hydraulic pressure in a hydraulic pressure chamber. A roller shaft is disposed on at least one of the cam followers and has a roller carried thereon to come into rolling contact with a valve operating cam. In this valve operating system, the hydraulic pressure chamber and a communication passage, which permits an oil supply passage to communicate with the hydraulic pressure chamber, are defined in a particular one of all the cam followers, which moves a smallest amount when the connection switch-over device is in its disconnecting state. The roller shaft, having the roller rotatably carried thereon, is mounted on the cam follower other than the particular one cam follower. Thus, it is possible to avoid an increase in size of the particular one cam follower, and avoid a complicated assembling operation and passage construction. Moreover, the valve operating load is reduced to a minimum by using the roller.
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Kajiwara Shigemasa
Miura Keiji
Shiiki Katsuaki
Tanaka Shigekazu
Yamano Junji
Honda Giken Kogyo Kabushiki Kaisha
Lo Weilun
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