Engine variable valve timing mechanism
US5724929A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1997 |
| Grant date | Mar 10, 1998 |
| Priority date | — |
| Expiry date | Apr 7, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L2001/34426
- 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 rotor is fixed to the distal end face of the camshaft, and the rotor has four vanes protruding radially outward. A housing is disposed to surround the rotor to be rotatable relative to the rotor and the camshaft, and the housing has recesses on the inner circumference. Each recess is divided by the vane into a first pressure chamber and a second pressure chamber. A first passage is defined in the camshaft, for supplying a hydraulic fluid pressure to the first pressure chamber so as to change the rotational phase of the second rotor with respect to the camshaft, and the first passage has an opening at the distal end face of the camshaft. A second passage is defined in the camshaft, for supplying a fluid pressure to the second pressure chamber so as to change the rotational phase of the second rotor with respect to the camshaft, and the second passage has an opening at outer circumference of the camshaft.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.