Switching valve

Abstract

A switching valve configured so that: multiple lands and grooves between said lands are formed on a valve body that moves backward and forward in the axial direction as a result of manual operation; multiple ports are opened in the cylinder into which the valve body is inserted to move freely backward and forward; and according to the position of the valve body in the axial direction, specific ports are made to communicate with each other through a groove or are blocked by the lands. The switching valve is provided with seals that provide a liquid-tight seal between the portions on the two sides of a land in the axial direction.

Description

Technical field [0001] The present invention relates to a directional valve for switching the path for supplying or discharging pressure fluid such as pressure oil, and in particular to a spool type valve core that moves along the axial direction to open and close the port. Switched valve. Background technique [0002] As an example of such a valve, an example of a manual valve used in an automatic transmission of a vehicle is described in Japanese Patent Application Laid-Open No. 2005-90635. According to Japanese Patent Laid-Open No. 2005-90635, the manual valve is a spool spool, which is housed in a body formed with a plurality of oil passages so as to be capable of reciprocating movement, and the spool spool is formed with an equivalent convex The large-diameter portion of the table portion and the tapered portion whose maximum outer diameter is equal to the large-diameter portion. The spool spool moves back and forth in synchronization with the shift lever, and opens and cl...

AI Technical Summary

Problems solved by technology

In this case, the pressurized fluid supplied from a hydraulic source such as a hydraulic pump passes through the selector valve. Leakage between the cylinder portion of the spool

That is, a part of the pressure fluid generated by using power is lost, and this leakage of hydraulic pressure may cause deterioration of energy efficiency

Moreover, in order to maintain a predetermined operating state, when the oil passage to the actuator supplying the pressure fluid is closed and the so-called enclosing control is performed to enclose the pressure fluid, if the above-mentioned manual valve is interposed in the oil passage on the enclosing side , the pressure leaks from the manual valve and the sealing control is no longer established. With this, continuous supply of pressure is required, which may deteriorate the fuel economy of the vehicle.

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