Pressure-regulating valve

Abstract

This pressure regulator comprises a valve body provided with an input port, a drain port, an output port and a feedback port, and the spool axially movably mounted in the valve body for selectively communicating the output port with the input port or the drain port, and the output port and the feedback port are communicated through a communication hole formed on the spool. The communication hole has a shaft center hole communicated with the feedback port formed on a shaft center of the spool and an orifice hole for supplying the oil pressure of the output port to the shaft center hole, a small diameter part is formed on an end part facing to the feedback port, of the spool, and a hole of a diameter same as the orifice hole is formed between an outer peripheral face of the small diameter part and the shaft center hole.

Description

technical field [0001] The invention relates to a pressure regulating valve used in the oil pressure control of various oil pressure devices. Background technique [0002] There are many matching elements in the automatic transmission for vehicles, and by selectively matching one or several of these elements, a multi-stage speed change is obtained. As a pressure regulating valve for controlling the oil pressure of the matching elements, it is known as figure 1 valve shown. [0003] This pressure regulating valve has a valve body 1 and a spool valve 10 provided in the valve body 1 to be freely movable in the axial direction. Valve body 1 is composed of input hole 2, discharge hole 3, output hole 4, feedback hole 5 and signal hole 7. The output hole 4 is set in the middle between the input hole 2 and the discharge hole 3, the feedback hole 5 is set at the end on the side of the input hole 2, and the signal hole 7 is set at the other end opposite to the feedback hole 5, that ...

AI Technical Summary

Problems solved by technology

[0009] However, the right end face of the above-mentioned slide valve 10 needs to be processed with the notch groove 11c, which requires processing man-hours and has the disadvantage of high cost. Outline shape, after machining the access hole 11b in the radial direction, then mill the notch groove 11c on the end face

[0010] At least three different processing steps are required to manufacture such a slide valve 10, which has the disadvantages of many man-hours and increased costs. In particular, the slide valve must be removed from the punching machine in order to mill the notched groove 11c. Reloading the card, thereby constituting the reason for the increase in man-hours

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