Solenoid valve
AssigneeDenso Corporation
InventorEiji Isobe
Life of this patent
Estimating the term…
Abstract
A feed position of oil from an oil pump is changed to improve the machinability of an engine cylinder block. A plunger guide is obtained which attains improvement in pump pressure resistance and retention of magnetic efficiency. An oil feed port connected to an oil feed path on the oil pump side is formed in a front end face of a sleeve in an electromagnetic type oil control valve, while a drain port connected to an oil discharge path on a drain side is formed in a side face of the sleeve, whereby an oil feed path formed in the engine cylinder block is positioned coaxially with a mounting hole of the electromagnetic type oil control valve. Further, a bottom wall portion of the plunger guide is curved so that the pump pressure resistance can be improved without increasing the plate thickness of the plunger guide.
Claims10
An electromagnetic type fluid control valve for feeding and discharging fluid selectively to and from a retard chamber or an advance chamber in a variable valve timing mechanism which is for changing an opening/closing timing of at least one of an intake valve and an exhaust valve in an engine, comprising:
- a sleeve, the sleeve having in one axial end face thereof a feed port connected to an oil path formed on an oil source side, the sleeve further having in a side face thereof a discharge port connected to a drain-side oil path, a first opening connected to an oil path formed on the retard chamber side, and a second opening connected to an oil path formed on the advance chamber side;
- and
- a spool with a hollow chamber, the hollow spool being slidably supported within the sleeve, the hollow spool having an axial bore which provides communication between the feed port and the first opening or the second opening,
- the sleeve and the hollow spool being constructed so that the first opening becomes larger than the second opening in retard operation and so that the second opening becomes larger than the first opening in advance operation.
Dependencies are inferred from the claim text.