JPH0590069U - solenoid valve - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a solenoid valve arranged and used in a hydraulic circuit, a pneumatic circuit or the like, and an object thereof is to make the total length of the valve body significantly shorter than in the past. A solenoid is arranged on one side of a tubular valve body, and a spool that is moved in the axial direction by the solenoid is arranged inside the valve body, and an adjustment is made on the other side opening of the valve body. In a solenoid valve in which a screw is screwed, and a coil spring is arranged between the adjusting screw and the spool, a spring insertion hole into which the coil spring is inserted is formed on the adjusting screw side of the spool, A supporting protrusion to be inserted into the coil spring is formed on the spool side of the adjusting screw.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a solenoid valve arranged and used in a hydraulic circuit or a pneumatic circuit.

[0002]

[Prior Art]

 Generally, in a hydraulic circuit, a pneumatic circuit, or the like, an electromagnetic valve is arranged, for example, for switching a flow path.

FIG. 2 shows this type of solenoid valve, and in the figure, reference numeral 11 indicates a tubular valve body. A solenoid 13 is arranged on one side of the valve body 11.

That is, a solenoid coil 21 formed by winding a coil 19 around a bobbin 17 is accommodated in the solenoid housing 15. Fixed iron cores 23 and 25 are arranged inside the solenoid coil 21, and a movable iron core 27 is movably arranged inside these fixed iron cores 23 and 25.

One side of the shaft 29 is inserted and fixed to the center of the movable iron core 27. The other side of the shaft 29 is inserted into a through hole 31 formed at the center of the fixed iron core 25 and protrudes into the valve body 11.

A bush 35 is arranged between the through hole 31 and the shaft 29. A flange portion 37 is formed on the solenoid 13 side of the valve body 11, and this flange portion 37 is in contact with the fixed iron core 25 and is fixed to the solenoid 13 side by the solenoid housing 15.

A drain port 39, an outlet port 41, and an inlet port 43 are formed in the valve body 11 in order from the solenoid 13 side at predetermined intervals. A spool 45 that is moved in the axial direction by the solenoid 13 is arranged in the valve body 11.

A female screw portion 47 is formed in the other side opening of the valve body 11, and an adjusting screw 49 is screwed into the female screw portion 47. A coil spring 51 is arranged between the adjusting screw 49 and the spool 45.

The spool 45 and the adjusting screw 49 are provided with support protrusions 53 and 55 that are inserted into one end and the other end of the coil spring 51 and that support the coil spring 51.

In the solenoid valve described above, when the solenoid coil 19 is energized, the fixed iron core 25 is excited in proportion to the magnitude of the current, and the movable iron core 27 is attracted to the fixed iron core 25. The fixed shaft 29 moves the spool 45 toward the adjusting screw 49 side against the biasing force of the coil spring 51, and as shown in the lower side of FIG. When the urging force of the spring 51 is balanced, the spool 45 is stopped and the ports 39, 41, 43 are switched.

[0011]

[Problems to be solved by the device]

 However, in such a conventional solenoid valve, since the spool 45 and the adjusting screw 49 have the support protrusions 53 and 55 that are inserted into one end and the other end of the coil spring 51 and support the coil spring 51, respectively. However, it is necessary to secure a sufficient space between the spool 45 and the adjusting screw 49 so that the supporting protrusions 53 and 55 do not come into contact with each other within the moving range of the spool 45. There is a problem that the entire length of the valve body 11 becomes long and the solenoid valve becomes large.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a solenoid valve capable of significantly shortening the overall length of the valve body as compared with the conventional one.

[0013]

[Means for Solving the Problems]

 In the solenoid valve of the present invention, a solenoid is arranged on one side of a tubular valve body, and a spool that is moved in the axial direction by the solenoid is arranged inside the valve body. In a solenoid valve in which an adjusting screw is screwed into the portion and a coil spring is arranged between the adjusting screw and the spool, the coil spring is inserted into the spool on the adjusting screw side. A spring insertion hole is formed, and a support protrusion to be inserted into the coil spring is formed on the spool side of the adjusting screw.

[0014]

[Action]

 In the solenoid valve of the present invention, when the spool moves toward the adjusting screw, the supporting protrusion of the adjusting screw is accommodated in the spring insertion hole of the spool.

[0015]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the solenoid valve of the present invention, in which reference numeral 61 denotes a tubular valve body.

A solenoid 63 is arranged on one side of the valve body 61. That is, in the solenoid housing 65, the solenoid coil 71 formed by winding the coil 69 around the bobbin 67 is accommodated.

Fixed iron cores 73 and 75 are arranged inside the solenoid coil 71, and a movable iron core 77 is movably arranged inside these fixed iron cores 73 and 75. One side of the shaft 79 is inserted and fixed to the center of the movable iron core 77.

The other side of the shaft 79 is inserted into a through hole 81 formed at the center of the fixed iron core 75 and protrudes into the valve body 61. A bush 85 is arranged between the through hole 81 and the shaft 79.

A flange portion 87 is formed on the solenoid 63 side of the valve body 61, and this flange portion 87 is in contact with a fixed iron core 75 and is fixed to the solenoid 63 side by a solenoid housing 65.

In the valve body 61, a drain port 89, an outlet port 91, and an inlet port 93 are formed in order from the solenoid 63 side at predetermined intervals. A spool 95, which is moved in the axial direction by a solenoid 63, is arranged in the valve body 61.

A female screw portion 97 is formed at the other opening of the valve body 61, and an adjusting screw 99 is screwed to the female screw portion 97. A coil spring 101 is arranged between the adjusting screw 99 and the spool 95.

In this embodiment, a spring insertion hole 103 into which the coil spring 101 is inserted is formed on the spool 95 side of the adjusting screw 99. Further, on the spool 95 side of the adjusting screw 99, a support protrusion 105 that is inserted into the coil spring 101 and has a smaller diameter than the spring insertion hole 103 is formed.

In the solenoid valve described above, when the solenoid coil 69 is energized, the fixed iron core 75 is excited in proportion to the magnitude of the current, and the movable iron core 77 is attracted to the fixed iron core 75. The fixed shaft 79 moves the spool 95 toward the adjusting screw 99 side against the biasing force of the coil spring 101, and as shown in the lower side of FIG. When the urging force of the spring 101 is balanced, the spool 95 is stopped and the ports 89, 91, 93 are switched.

In the solenoid valve described above, a spring insertion hole 103 into which the coil spring 101 is inserted is formed on the adjusting screw 99 side of the spool 95, and the coil spring 101 is inserted to the spool 95 side of the adjusting screw 99. Since the supporting protrusion 105 to be formed is formed, the total length of the valve body 61 can be significantly shortened as compared with the conventional case.

That is, when the spool 95 moves to the adjusting screw 99 side, the supporting projection 105 of the adjusting screw 99 is accommodated in the spring insertion hole 103 of the spool 95, and thus the spool and the supporting projection are supported as usual. It is not necessary to lengthen the valve body in consideration of contact with the valve body, and the total length of the valve body 61 is significantly shorter than the conventional one.

[0026]

[Effect of the device]

 As described above, in the solenoid valve of the present invention, when the spool moves to the adjusting screw side, the supporting protrusion of the adjusting screw is accommodated in the spring insertion hole of the spool, so that the contact between the spool and the supporting protrusion is considered. This eliminates the need to lengthen the valve body and has the advantage that the overall length of the valve body can be made significantly shorter than before.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a solenoid valve of the present invention.

FIG. 2 is a cross-sectional view showing a conventional solenoid valve.

[Explanation of symbols]

 61 valve body 63 solenoid 95 spool 99 adjusting screw 101 coil spring 103 spring insertion hole 105 support protrusion

Claims (1)

[Scope of utility model registration request] 1. A solenoid is arranged on one side of a tubular valve body, and a spool that is moved in the axial direction by the solenoid is arranged inside the valve body, and the spool is arranged on the other side opening of the valve body. In a solenoid valve in which an adjusting screw is screwed and a coil spring is arranged between the adjusting screw and the spool, a spring insertion hole into which the coil spring is inserted is formed on the adjusting screw side of the spool. The solenoid valve is characterized in that a support protrusion to be inserted into the coil spring is formed on the spool side of the adjusting screw.