JP2007002957A - Solenoid valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To materialize a positive retention structure of a spring and simple assemblability, and simultaneously compatibly establish low cost. <P>SOLUTION: In a solenoid valve provided with a cylindrical bobbin 13 having coil 14 wound around an outer circumference thereof, a rear yoke 16 provided on an inner circumference of the bobbin 13, a plunger 15 opposing to the rear yoke 16 and movable in relation to the bobbin 13, a spool 21 abutting on the plunger 15, a spool 22 slidably built in the spool 21 and an energizing member 23 energizing the spool 21 in one direction in the sleeve 22, the energizing member 23 is pressed by a depressed shape disk 24 including a flange 24c engaging with the groove 22a formed on an sleeve 22 end part inner circumference and is retained by engaging with the groove 22a and the flange part 24c. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a solenoid valve used in a hydraulic circuit.

As a conventional electromagnetic valve, an electromagnetic valve is disclosed that includes a plunger formed of an iron-based material driven by an electromagnetic coil, and a spool member that is biased by a spring and abuts against the plunger. (For example, see Patent Document 1 and Patent Document 2)
In the solenoid valve of Patent Document 1, the spool valve (33) slidably incorporated in the valve body (1) is in contact with one end of the plunger member (29) at one end thereof. At the other end of the spool valve (33), a spring (39) for applying a biasing force to the spool valve (33) is inserted into a groove (1b) at the end of the valve body (1) via a retainer member (37). It is held by the attached retaining ring (35).

  In the solenoid valve of Patent Document 2, a coil spring (28) that biases the spool (14) toward the solenoid (10) is held by an adjusting screw (24) screwed to the other end of the sleeve (15). Yes.

In the structure in which the spring is held by the snap ring via the retainer member as in Patent Document 1, the snap ring pliers are forced to be fitted while pushing the spring while reducing the diameter of the snap ring. It is bad. Further, in the structure of holding the spring by a screw as in Patent Document 2, there is a possibility that the plunger driven by the electromagnetic coil may not perform a predetermined operation due to fluctuation of the spring load due to the loosening or the axial displacement. . Further, the spring holding structure using screws requires high-precision screw machining to ensure positional accuracy, leading to an increase in cost.
JP-A-11-002354 (FIG. 1) JP 2004-176895 A (FIG. 1)

  An object of the present invention is to solve the above-mentioned problems of the prior art, achieve a reliable spring holding structure and a simple assembling property, and at the same time achieve both low cost.

The first technical measure taken to solve the above problems is as follows:
A cylindrical bobbin around which a coil is wound,
A fixed core disposed on the inner periphery of the bobbin;
A plunger facing the fixed core and movable relative to the bobbin;
A spool member in contact with the plunger;
A sleeve member that slidably incorporates the spool member;
An electromagnetic valve comprising an urging member for urging the spool member in one direction within the sleeve member;
The urging member is held by being pressed by a concave disk having a flange that engages with a groove formed on the inner periphery of the sleeve member end portion and engaging the groove and the flange. That is.

The second technical means is the first technical means,
The biasing member is a spring.

The third technical means is the first technical means or the second technical means,
The concave disk is provided with a plurality of cutouts radially leaving a central portion.

The fourth technical means is the first technical means, the second technical means, or the third technical means,
The concave disk is made of spring steel.

  According to the invention of claim 1, a cylindrical bobbin having a coil wound on the outer periphery, a fixed core disposed on the inner periphery of the bobbin, and a plunger facing the fixed core and movable relative to the bobbin An urging member comprising: a spool member that contacts the plunger; a sleeve member that slidably incorporates the spool member; and a urging member that urges the spool member in one direction within the sleeve member. Is held by engaging the groove and the flange by being pressed by the concave disk having the flange that engages with the groove formed on the inner periphery of the end of the sleeve member. It does not occur.

  According to the invention of claim 2, since the urging member is a spring, the groove formed in the inner periphery of the end of the sleeve member is engaged with the flange portion of the concave disk by pushing the concave disk. Therefore, the biasing member can be reliably held by a simple method.

  According to the invention of claim 3, since the plurality of cutouts are provided radially leaving the central portion, it can be easily deformed in the radial direction. When assembling, put the built-in parts such as spools and springs in the sleeve, and then place the concave disk on the sleeve end and push the center part into it. The sleeve is engaged and fixed in a groove formed in the inner periphery of the sleeve end. As in the case of using a snap ring, a difficult work of fitting while pushing the spring while reducing the diameter of the snap ring with the snap ring pliers becomes unnecessary. Alternatively, there is no risk of loosening or axial misalignment, such as screws.

  According to the invention of claim 4, since the concave disk is formed of spring steel, it can be more easily elastically deformed in the inner diameter direction. Further, since it can be manufactured by pressing a plate material, it can be manufactured at a lower cost than a screw that requires processing dimensional accuracy.

  An embodiment of a solenoid valve according to the present invention will be described with reference to FIGS.

  In FIG. 1, a case 14 includes a coil 14 wound around a bobbin 13 formed of a resin material. A resin connector 12, which is electrically connected to the coil 14 at one end of the case 11 and integrally molded with a terminal 26 for flowing current through the coil 14, is fixed to the case 11 via an O-ring 28. .

  Inside the bobbin 13, a cylindrical rear yoke 16 with a flange on the terminal 26 side and a front yoke 17 on the other end side are built in to form a magnetic path. The front yoke 17 has a cylindrical shape with a one-step large-diameter disk portion at the center, and the disk portion is press-fitted and integrated with the case 11 to block outside air.

  Inside the rear yoke 16, a plunger 15 into which a shaft 18 is press-fitted and integrated is held by a bearing 19 and a bearing 29 so as to be slidable in the axial direction.

  A cylindrical sleeve 22 is press-fitted and integrated into the cylindrical portion of the front yoke 17 facing the case 11.

  A cylindrical spool 21 is slidably incorporated in the sleeve 22, and a ball 20 is press-fitted into the inner diameter of the shaft 18 and is in contact with the shaft 18. Further, a spring 23 is installed at an end facing the shaft 18 to urge the spool 22 toward the shaft 18 side.

  The spring 23 is a coil spring having an outer diameter slightly smaller than the inner diameter of the sleeve 22, one end contacting the spool 21 and the other end contacting the stopper plate 24.

  The stopper plate 24 is made of spring steel and is a concave disk having a two-stage cylindrical portion. The large-diameter portion 24a has an inner diameter of the sleeve 22 and the small-diameter portion 24b has substantially the same size as the inner diameter of the spring 23. One end of the portion 24a has a flange portion 24c. Since the central portion is perforated and the large diameter portion 24a is provided with radial U-shaped cutouts 24d, it can be easily elastically deformed in the radial direction. When the built-in components such as the spool 21 and the spring 23 are inserted into the sleeve 22 at the time of assembling, the outermost flange portion 24c is moved to the inner diameter side by pushing against the reaction force of the spring 23 from the end of the sleeve 22. The sleeve 23 is elastically deformed to enter the sleeve 22, and the flange portion 24 c engages with the groove 22 a formed on the inner periphery of the end portion of the sleeve 22, so that the spring 23 can be easily fixed.

  Next, the operation will be described. FIG. 1 shows a state without energization. The oil supplied from the oil pump (not shown) to the port IN of the sleeve 22 is discharged from the port OUT1 of the sleeve 22 through the communication groove 21a of the spool 21. At this time, the port OUT2 communicates with the port Drain through the small hole 21b of the spool 21. Here, when a current flows from the power source (not shown) to the coil 14 via the terminal 26, the plunger 15 is attracted in the axial direction by the magnetic force generated between the opposing surfaces of the plunger 15 and the front yoke 17, and the spring It moves to the left in FIG. 1 against the urging force of 23. The movement of the plunger 15 causes the shaft 18 to push the spool 21 in the axial direction (leftward in FIG. 1) via the ball 20. Eventually, the plunger 15 comes into contact with the spacer 25 and stops moving.

  In this state, the oil supplied to the port IN of the sleeve 22 is discharged from the port OUT2 of the sleeve 22 through the communication groove 21a of the spool 21. At this time, the port OUT1 communicates with the port Drain through the small hole 21C of the spool 21.

  In other words, by supplying a current to the coil 14 via the terminal 26, the oil supplied from the port IN is switched to supply from the port OUT1 to supply to the port OUT2.

It is an axial sectional view of the solenoid valve according to the present invention. It is the A section enlarged view of FIG. It is a perspective view of the stopper plate 24 which concerns on this invention.

Explanation of symbols

11 ... case 12 ... connector 13 ... bobbin 14 ... coil 15 ... plunger 16 ... rear yoke 17 ... front yoke 18 ... shaft 21 ... spool 22 ... Sleeve 23 ... Spring 24 ... Stopper plate 26 ... Terminal

Claims (4)

A cylindrical bobbin around which a coil is wound,
A fixed core disposed on the inner periphery of the bobbin;
A plunger facing the fixed core and movable relative to the bobbin;
A spool member in contact with the plunger;
A sleeve member that slidably incorporates the spool member;
A solenoid valve comprising a biasing member for biasing the spool member in one direction in the sleeve member;
The urging member is pressed by a concave disk having a flange that engages with a groove formed on the inner periphery of the sleeve member end, and is held when the groove and the flange are engaged. A solenoid valve characterized by that. In claim 1,
The solenoid valve according to claim 1, wherein the biasing member is a spring. In claim 1 or claim 2,
The solenoid valve according to claim 1, wherein the concave disk is provided with a plurality of cutouts radially leaving a central portion. In claim 1, claim 2 or claim 3,
The electromagnetic valve, wherein the concave disk is made of spring steel.

Images