Variable valve timing mechanism of engine
US5785026A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 4, 1997 |
| Grant date | Jul 28, 1998 |
| Priority date | — |
| Expiry date | Apr 4, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L2001/0537
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.