System for varying cylinder valve timing in an internal combustion engine
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 25, 2015
Grant Date -
Sep 11, 2014
app pub date -
Mar 11, 2013
filing date -
Mar 11, 2013
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A variable engine valve timing control system has a cam phase actuator, with first and second actuator ports, to adjust a rotational phase of a camshaft relative to a crankshaft. A first control valve selectively couples the first actuator port to either an engine oil pump or a first valve port. A second control valve selectively couples the second actuator port to either the engine oil pump or a second valve port. Separate check valves prevent oil flow backwards through the first and second control valves from the cam phase actuator to the engine oil pump. In one implementation, the first valve port and second valve port are connected to a fluid reservoir. In another implementation, the first valve port is connected by another check valve to the second actuator port, and the second valve port is connected by a further check valve to the first actuator port.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully