JPH03121386A - Solenoid proportional pressure control valve - Google Patents

Abstract

PURPOSE:To eliminate the need of a rod and a spool and to decrease the number of parts by sliding a plunger by the thrust of a proportional solenoid and the spring force to control the outlet side pressure in proportion to the amount of current applied to a coil of the proportional solenoid. CONSTITUTION:An inlet side passage 18 and an outlet side passage 19 are formed on the fixed body 13 side, and constricted portions 24-26 are formed in a plunger 15. The plunger 15 is slid by the force of a spring 27 and the outlet side pressure in the direction of intercepting the inlet side passage 18 and outlet side passage 19, and slid in the communicating direction by the thrust of a solenoid 14. Thus, the outlet side pressure proportinal to the thrust of the solenoid 14 can be obtained only by the pluger 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electromagnetic proportional pressure control valve that uses the thrust of a solenoid to slide a spool.

[Conventional technology]

As shown in FIG. 4, fit the spool 2 into the valve body 1,
This spool 2 is connected by a spring 3 to an inlet port 4 and an outlet boat 5.
The rod 8 provided on the plunger 7 of the proportional solenoid 6 pushes the spool 2 in a direction that communicates the inlet port 4 and the outlet boat 5, and the diameter d1 of one end of the spool 2 is changed to the other end. The outlet pressure P is made larger than the side diameter d2.
. A rightward force is applied to the spool 2, that is, a force in a direction that blocks the inlet port 4 and the outlet port 5, so that a pressure proportional to the thrust of the proportional solenoid 6 is obtained.

[Problem to be solved by the invention]

In such an electromagnetic proportional pressure control valve, the proportional solenoid 6
Since the spool 2 is pushed with a thrust force of Not only does this require a large number of parts, resulting in high costs, but the contact surface between the rod 8 and spool 2 may become dented or worn, resulting in poor durability, and the rod 8 may sink into the plunger 7 or be removed. Furthermore, since the plunger 7 and rod 8 push the spool 2, they tend to buckle instead of being aligned in a straight line, generating lateral force and increasing hysteresis.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an electromagnetic proportional pressure control valve that can solve the above problem.

[Means and actions for solving the problem] An inlet side passage and an outlet side passage are formed on the fixed body side, a constricted part is formed in the brush jar, and the plunger is connected to the inlet side passage and the outlet side passage by spring force and outlet side pressure. The plunger slides in the direction of blocking the solenoid and in the direction of communicating with the solenoid thrust, so that the outlet side pressure proportional to the solenoid thrust can be obtained using only the plunger.

〔Example〕

As shown in FIG. 1, a blind plug 11 and a sleeve 12 are fitted into a cylindrical body 10 to form a fixed body 13, a coil 14 is provided on the body 10, and a plunger 15 is slidably inserted into the sleeve 12. Insert the proportional solenoid]6.

The sleeve 12 is fitted flush with the body 10 and is prevented from being removed by a ring 17. The sleeve 12 is formed with an inlet port 18 and one outlet port. 19 communicates with an inlet hole 20° and an outlet hole 21 formed in the body 10. In other words, as shown in FIG.
A is formed, and the inlet/outlet boats 18, 1.9 are open to the smooth parts 12a, 12a on two outer peripheries, and form an inlet hole 20 and an outlet hole 21 between them and the hole 22 of the body 10. .

A shaft hole 23 is formed in the plunger 15, and first, second, and third constricted portions 24.2526 are formed on the outer peripheral surface, and the plunger 15 is brought into contact with the ring 17 by a spring 27 provided between the plunger 15 and the blind stopper 11. When the coil 14 is energized, the plunger 15 slides in the direction of communicating the inlet boat 18 and the outlet port 19.

The body 10 is attached to a valve body 28, and the valve body 28 has an inlet port 29, an outlet port 30°, and a tank port 31. The ports 30 communicate with the shaft holes 23, respectively.

The outer diameter d1 on one end of the plunger 15 is the outer diameter d2 on the other end.
The plunger 15 becomes larger due to the outlet side pressure.
is designed so that a force acts in a direction that blocks the inlet hole 18 and the outlet hole 19, and thereby the thrust of the proportional solenoid 6, that is, the electromagnetic force that produces the outlet side pressure proportional to the amount of current (current) applied to the coil 14. It constitutes a proportional pressure control valve.

〔Effect of the invention〕

By sliding the plunger 15 using the thrust and spring force of the proportional solenoid, the outlet pressure can be controlled in proportion to the amount of current flowing to the proportional solenoid's coil. Since rods and spools are not required, the number of parts is reduced and costs are reduced. Not only this, but each part will not dent or wear out and its durability will be improved.

Furthermore, since the plunger 15 is pulled by the thrust of the proportional solenoid, there is no tendency for buckling, and hysteresis can be reduced.

[Brief explanation of drawings]

1, 2, and 3 show embodiments of the present invention;
2 is a perspective view of the sleeve, FIG. 3 is a sectional view taken along the line ■--■ in FIG. 1, and FIG. 4 is a sectional view of a conventional example. 13 is a fixed body, 14 is a coil, 15 is a plunger, 27
is a spring.

Claims (1)

[Claims] A plunger 15 is fitted into a fixed body 13 provided with a coil 14 to form a proportional solenoid 16, and an inlet passage and an outlet passage are formed in the fixed body 13.
A constriction is formed at the inlet side passageway and the outlet side passageway, and the plunger 15 is biased in the blocking direction by the spring 27 and slid in the communicating direction by the thrust of the proportional solenoid 16. An electromagnetic proportional pressure control valve that slides in the shutoff direction using side pressure.