Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1997-05-20
1998-06-16
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9031, F01L 1344
Patent
active
057655189
ABSTRACT:
A variable valve timing mechanism is provided at the distal end of an exhaust camshaft for changing a valve timing of an intake valve. An exhaust and intake camshafts are rotatably supported by a cylinder head, and both camshafts are connected by gears. The exhaust camshaft has a flange. The sleeve has large diameter portions at both ends of its journal, and has a distal end surface and a proximal end surface that is adjacent to the flange. A housing is fixed at the distal end of the exhaust camshaft. A ring gear is positioned between the housing and the sleeve. First and second hydraulic pressure chambers are defined at the ends of the ring gear. A pressure receiving surface is provided on the exhaust camshaft. The receiving surface is located in the second pressure chamber, while the distal end surface is located in the first pressure chamber.
REFERENCES:
patent: 4993370 (1991-02-01), Hashiyama et al.
patent: 5181485 (1993-01-01), Hirose et al.
patent: 5657671 (1997-08-01), Morii
Lo Weilun
Toyota Jidosha & Kabushiki Kaisha
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