Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1997-04-04
1998-07-28
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9031, F01L 1344
Patent
active
057850267
ABSTRACT:
A Variable Valve timing mechanism is provided at the distal end of a camshaft for changing a valve timing of an engine valve. A camshaft is rotatably supported by a cylinder head and bearing cap, which form a baring. A pulley is mounted on the camshaft, and is relatively rotatably with respect to the camshaft. A belt connects the pulley to a crankshaft to transmit power from an engine to the pulley. The belt applies tension to the pulley and the camshaft in a specific direction. A ring gear is positioned between the camshaft and the pulley. First and second hydraulic pressure chambers are defined at the ends of the ring gear. A first oil passage is defined in the camshaft and is connected to the first pressure chamber. A second oil passage is defined in the camshaft, and is connected to the second pressure chamber. A pair of grooves extend along the inner circumference of the cylinder head. The grooves are wider in a load bearing portion of the bearing. In another embodiment, the grooves do not extend into a non-load bearing portion of the bearing.
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Lo Weilun
Toyota Jidosha & Kabushiki Kaisha
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