JPH0594587U - Check valve - Google Patents

Abstract

(57) [Summary] [Purpose] Stabilize the operation of the check valve. [Structure] A ball seat 4 is fixed in the opening of the valve hole 2a. The entrance passage 4a is provided on the axis of the ball seat.
Is formed, and a seat portion 4b on which the steel ball 6 is seated is provided on the inner side thereof. The steel ball is urged in the ball seat direction by a spring 10 via a retainer 8. The retainer includes a holding portion 8a that is bent and holds the steel ball so as to hold it, and a guide portion 8b that opens outward and slides against the inner surface of the valve hole. The holding portions and the guide portions are alternately provided, and the space between the guide portions, that is, the outer peripheral side of the holding portion serves as a fluid passage. [Effect] The steel ball will not dance and the spring will not fall when the valve is opened.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a check valve, for example, a check valve incorporated in an oil pump to regulate a maximum pressure.

[0002]

[Prior Art]

 The flow rate of the fluid discharged from the oil pump is controlled by the flow control valve and is supplied to the hydraulic equipment, while the surplus flow returns to the suction side of the pump. Has a built-in check valve that regulates maximum hydraulic pressure.

An example of such a conventional check valve will be described with reference to FIG. The check valve 100 is built in a spool 104 of a flow control valve provided in a pump body 102 of the oil pump. A ball seat 106 is screwed and fixed to the opening of the valve hole 104a in the spool 104. A passage 106a on the inlet side is formed in the axis of the ball seat 106, and a steel ball 108 is seated on the inner side opening of the inlet passage 106a. The steel ball 108 is supported by the retainer 110 and is urged toward the valve seat 106 by the spring 112. The side wall of the spool 104 is provided with an outlet passage 104b that communicates the inside of the valve hole 104a with the outside. When the check valve 100 is opened, the fluid flowing from the inlet passage 106a of the ball seat 106 through the space between the ball seat 106 and the ball 108 passes through the gap between the inner surface of the valve hole 104a and the outer surface of the retainer 110. Then, it flows out from the outlet passage 104b of the spool 104 to the suction side of the pump.

[0004]

[Problems to be solved by the device]

 In the conventional check valve 100 described above, a clearance is provided between the inner peripheral surface of the valve hole 104a and the outer peripheral surface of the retainer 110 so as not to hinder the flow of fluid when the valve is opened. Therefore, the steel ball 108 may dance or the spring 112 may fall when the spring 112 expands and contracts. In such a case, there is a problem that foreign matter is caught between the steel ball 108 and the retainer 110, the steel ball 108 is not stable and the sheet is incomplete, and a relief pressure drop and oscillation occur. .. Further, if the clearance between the valve hole 104a and the retainer 110 is made too small in order to eliminate this defect, there is a problem that the fluid flow at the time of valve opening does not become smooth and the relief pressure is not stable. ..

The present invention has been made to eliminate the above-mentioned problems, and provides a check valve in which the steel ball does not dance or the spring falls when the spring expands or contracts.

[0006]

[Means for Solving the Problems]

 The check valve according to the present invention is provided with a ball seat fixed inside the valve hole, a ball seated in the valve seat to open and close the entrance passage, and a retainer for the ball. And a spring that urges the ball toward the seat through the retainer.The retainer is bent by the retainer along the outer surface of the ball to hold the ball, and the retainer is expanded outward to open the valve. A guide portion that slides on the inner surface of the hole is provided.

[0007]

[Action]

 In the above check valve, the ball is held by the retainer and integrated, so the ball does not dance when the valve opens and closes, and the guide part of the retainer is in sliding contact with the inner surface of the valve hole. , The spring will not fall down. Moreover, a sufficient fluid passage is secured between the guide portions, that is, on the outer peripheral side of the holding portion.

[0008]

【Example】

 The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 is a vertical sectional view of a check valve according to an embodiment of the present invention, which is provided in a valve hole 2a formed in a spool 2 of a flow control valve. The ball seat 4 is fixed to the opening side of the valve hole 2a. An inlet passage 4a is formed in the shaft core of the ball seat 4, and an opening located inside the valve hole 2a of the inlet passage 4a has a large diameter to form a seat portion 4b on which a steel ball 6 is seated. Further, an outlet passage 2b is provided on the inner side wall of the valve hole 2a.

The steel ball 6 is held by a retainer 8 and is urged by a spring 10 to be seated on the seat portion 4b. The retainer 8 is basically cylindrical in shape, and has three ball holding portions 8a and three ball holding portions at the end portion on the side supporting the steel balls 6, as shown in FIG. It has three guide parts 8b located between 8a. The ball holding portion 8a is curved along the outer surface of the steel ball 6 and holds the steel ball 6 by holding it from three sides. The guide portion 8b is bent outward to an angle close to a right angle with respect to the tubular main body portion 8c of the retainer 8, and the tip 8d of the guide portion 8b is substantially parallel to the inner surface of the valve hole 2a. It is bent to the seat 4 side. The front ends 8d of these three guide portions 8b are in sliding contact with the inner surface of the valve hole 2a.

The spring 10 for pressing the steel ball 6 via the retainer 8 is arranged between the bottom surface 2c of the valve hole 2a and the back side of the guide portion 8b of the retainer 8.

The operation of the check valve having the above configuration will be described. When the steel ball 6 is pushed by the hydraulic pressure in the chamber 12 on the outer side of the ball seat 2 and moves to the right in the drawing, the oil flows into the inlet passage 4a of the valve seat 4 and the sheet portion 4b of the valve seat 4 and the steel. It passes through the ball 6 and enters the inside of the valve hole 2a. Further, this oil enters the spring 10 side through the space outside the holding portion 8a of the retainer 8, that is, the space between the guide portions 8b of the retainer 8, and flows out from the outlet passage 2b. When the check valve is provided in the flow control valve of the oil pump as in the present embodiment, the oil flowing out from the outlet passage 2b is the oil that overflows from the flow control valve and the oil from the tank. Joins the oil and goes to the pump room.

As described above, in the check valve, the steel ball 6 and the retainer 8 are integrated, so that the steel ball 6 does not dance and foreign matter is clogged between the steel ball 6 and the retainer 8. Will disappear. Moreover, since the guide portion 8b is in contact with the inner surface of the valve hole 2a, the spring 10 does not fall over. Further, since a wide space is provided between the guide portions 2b, a sufficient flow passage area can be secured, foreign matter can easily flow, and the sheet portion is less likely to be caught.

The shape of the retainer 8 is not limited to the one shown in the figure. The retainer 8 is integrated with the steel ball 6 and the retainer 8 is slidably contacted with the inner surface of the valve hole 2a to form a retainer. Needless to say, the number, shape, etc. of the holding portion 8a and the guide portion 8b may be changed as long as the movement of 8 in the radial direction can be restricted.

[0014]

[Effect of the device]

 As described above, according to the present invention, the retainer holds the ball, and at the same time, the retainer is extended outward to form the guide portion, which is slidably contacted with the inner surface of the valve hole. , You can get a stable check valve function.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a check valve according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a vertical sectional view of a conventional check valve.

[Explanation of symbols]

 2a Valve hole 4 Ball seat 4a Ball seat inlet passage 6 Ball 8 Retainer 8a Retainer retainer 8b Retainer guide 10 Spring

Claims (2)

[Scope of utility model registration request] 1. A ball seat fixed in a valve hole and having an entrance-side passage formed therein, a ball seated on the ball seat to open and close the entrance passage, and a ball seat via the retainer. In a check valve provided with a spring that biases in a direction, a retainer that is bent along the outer surface of the ball to hold the ball and a retainer that extends outward and slides on the inner surface of the valve hole. A check valve that is provided with a guide portion that comes into contact with the check valve. 2. The retainer of the retainer and the guide of the retainer are provided in plural, and are arranged alternately, and the outer peripheral side of each retainer constitutes a fluid passage.
Check valve described in.