JPH1167535A - Solenoid for hydraulic solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid for hydraulic solenoid valve, the movable core and movable pin of which can be manufactured inexpensively by reviewing the flow passage of oil made to flow from a valve element side. SOLUTION: A hydraulic solenoid valve B is provided with a solenoid 1 and a valve element 40. A bobbin 5 of the solenoid 1 has a rear wall 5a and is formed into a cylindrical shape having an opened front end, and the internal surface of the bobbin 5 has a first surface 55 for accepting a fixed core 9 when the core 9 is inserted into the bobbin 5 and a second surface 55 for accepting a movable core 11 in a slidable state, when the core 11 is inserted into the bobbin 5. In addition, recessed oil grooves 57 are formed on the internal surface of the bobbin 5 in the axial direction, so as to communicate the surfaces 55 and 56 with each other, and a wavy holding spacer 17 which is put on the front end section of the fixed core 9 is held on the holding surface of a valve element 40b. The spacer 17 has flow passages for supplying oil to the oil grooves 57 of the bobbin 5. Therefore, the movable core 11 and a movable pin 12 are formed into round shapes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid having a fixed iron core and a movable iron core, which is mounted on a hydraulic valve body. The present invention relates to a solenoid for a hydraulic solenoid valve which can be supplied.

[0002]

2. Description of the Related Art Conventionally, a solenoid has a bobbin formed in a hollow shape, a magnetic coil wound around the bobbin, a fixed iron core disposed in the bobbin, and a sliding member which is close to and separated from the fixed iron core. And a movable iron core to be moved, and is widely used as a hydraulic solenoid valve by being attached to a hydraulic valve body or the like. Then, by connecting a movable pin pressed from a movable iron core to a spool arranged in the valve body, the flow path of the hydraulic valve is released and hydraulically operated.

A solenoid 20 shown in FIG. 7 is used as an oil immersion type in a hydraulic solenoid valve or the like. The solenoid 20 includes a coil assembly 21 and a tube assembly 26 fitted into the coil assembly 21. And a nut 31 for fixing the coil assembly 21 and the tube assembly 26. The coil assembly 21 has a hollow shape in which a magnetic coil 23 is wound in an outer case 22 of a hollow round magnetic material. The bobbin 24 and the yoke 25 are integrally formed of resin, and the tube assembly 26 is
7 and a movable iron core 28, and further includes a fixed iron core 27 and a pipe 29 for fitting the movable iron core 28. The pipe 29 is formed of a ring-shaped non-magnetic material, is inserted into the inner peripheral surface of the hollow portion of the bobbin 24, and has one end engaged with and welded to the fixed core 27, and is fixed to the inner peripheral surface.
A movable iron core 28 approaching and separating from the movable core 28 is slidably disposed. A stopper 30 is welded to the other end of the pipe 29, and a nut 31 is screwed and attached to the stopper 30 in order to integrally fix the coil assembly 21 and the tube assembly 26.

A through hole 27a is formed in the fixed core 27 along the central axis, and the movable core 28 is formed in the through hole 27a.
Movable pin 3 connecting the spool 41A of the valve body 40A with the movable pin 3
3 is inserted. As shown in FIG. 8, the movable pin 33 is formed in an irregular shape with a round pin having a flat portion 33a with both sides chamfered, and an oil passage is formed between the flat portion 33a and the through hole 27a. Further, the fixed iron core 27 has a male screw 27b formed on the outer periphery of the distal end portion.
b is attached to the valve body 40A.

On the other hand, as shown in a sectional view of FIG. 9, oil grooves 28a for circulating oil are formed in the movable iron core 28 at two locations facing inward from the outer peripheral surface in the axial direction. Therefore, the oil flowing from the valve body 40A is circulated to the stopper 30 through the oil groove 28a of the movable iron core 28. And a seal for preventing oil leakage was provided at a necessary place.

[0006]

However, as price competition intensifies, it is necessary to review the price of conventional solenoids. In particular, in the oil immersion type solenoid 20, a pipe 29 made of a non-magnetic material is arranged because oil circulates inside. Since the pipe 29 is arranged such that one end is engaged with the fixed iron core 27 and the other end is projected rearward from the outer case 22, a stopper 30 for closing the hollow portion of the pipe 29 is required. But,
In reviewing the price, reducing the number of parts leads to cost reduction. In particular, the parts are reviewed by removing the conventional stopper 30 and nut 31, and at the same time, the oil groove and the irregular shape formed in the movable iron core 28 are formed. In order to increase the cost of movable pins, parts have been reviewed.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and eliminates the conventional nuts and stoppers, improves the oil passage, and manufactures the movable iron core and the movable pin at low cost, thereby reducing the cost. An object of the present invention is to provide a solenoid for a hydraulic solenoid valve which can be achieved.

[0008]

SUMMARY OF THE INVENTION A hydraulic solenoid valve according to the present invention is configured as follows to solve the above-mentioned problems. That is, a fixed core, a movable core disposed slidably with respect to the fixed core by exciting the coil, a movable pin disposed at the tip of the movable core and connected to a spool in a hydraulic valve body, A solenoid for a hydraulic solenoid valve configured such that a distal end portion of the fixed core is supported by a valve body, wherein the movable core and the fixed core are disposed inside, and the valve body side is closed. The inner peripheral surface of the tube has an oil groove formed along the axial direction, and the fixed iron core is inserted into the valve body, and the tube is fixed. A holding spacer that is supported in contact with the valve body is provided at a tip end portion of the iron core, and the holding spacer has a flow passage through which the oil flowing in from the spool side passes. It is characterized by the following.

Preferably, the tube is formed as a bobbin which is wound around the coil and has a rear portion closed with a rear wall.

[0010] More preferably, the holding spacer is fitted and held at the tip of the fixed iron core, and the outer peripheral surface of the holding spacer is formed in a wavy shape so as to form a flow path. Anything should do.

The holding spacer is fitted and held at the tip of the fixed iron core and is formed in an annular shape, and a plurality of flow passage holes are formed in an annular main body of the holding space. It may be characterized by that.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

The solenoid for a hydraulic solenoid valve of the present embodiment (hereinafter, referred to as a solenoid)
1, a round outer case 3, a bobbin 5 as a tube arranged in the outer case 3, a coil 7 arranged to wind the bobbin 5, and Fixed core 9 and movable core 1 placed in bobbin 5
The outer case 3 is attached to the valve body 40 with the fixed iron core 9 inserted and supported in the valve body 40.

The outer case 3 is formed of a magnetic material, and has a front end (a lower part in FIG. 1) opened with a flange 3a.
The rear part (the upper part in FIG. 1) is formed to have a smaller diameter than the main body part 3b, and the rear end part is closed with a rear wall 3c and is formed in a cylindrical shape as a whole.

The bobbin 5 is formed of a non-magnetic material in a cylindrical shape, and has a front end opened and a rear end closed with a rear wall 5a. A pair of coil storage walls 51 and 52 are formed on the outer peripheral surfaces of the front end portion and the intermediate portion of the bobbin 5 so as to be outwardly received in the outer case 3. The coil 7 is wound and stored. A groove 51a into which the O-ring 15 is fitted is formed on the front end surface of the coil housing wall 51 on the front end side.
The ring 15 is pressed against the mounting surface of the valve body 40. Thereby, a sealing action is performed so that the oil flowing from the valve body 40 to the solenoid 1 side does not leak outside.

On the rear end side, a disk-shaped flange plate 53 is formed at a distance from the rear coil housing wall 52 so as to be housed in the outer case 3. The coil 7 is inserted into the gap 5b formed between the
Is inserted between the flange plate 53 and the rear end surface of the main body 3b of the outer case 3.
Is arranged.

A stopper 54 projecting inward is formed inside the rear wall 5a of the bobbin 5. The movable core 11 is bonded to the movable core 11 so that the movable core 11 does not come into close contact with the oil when the movable core 11 comes into contact with the stopper 54. The area is reduced.

Further, on the inner peripheral surface of the bobbin 5, as shown in FIG. 2, a first fitting surface 55 for fitting with the fixed iron core 9 is formed on the front end side, and is connected to the first fitting surface 55. A second fitting surface 56 to which the movable iron core 11 is fitted is formed on the rear end side. The first fitting surface 55 is formed to have a larger diameter than the second fitting surface 56, and the fixed core 9 is positioned by the rear end surface of the fixed core 9 abutting the front end surface of the second fitting surface 56. .

FIG. 3 shows a circumferential section of the bobbin 5 from the first fitting surface 55 to the second fitting surface 56 side. A plurality of (six in the figure) concave oil grooves 57 communicating the first fitting surface 55 and the second fitting surface 56 are formed along
3 is formed. This oil groove 57 may be only one,
Also, a plurality of them may be formed at equal intervals. Therefore, the oil groove 5
7 is formed shallow from the tip of the bobbin 5 to the first fitting surface 55 where the fixed iron core 9 is fitted, and is formed deep from the second fitting surface 56 where the movable iron core 11 is fitted. Note that an oil groove 57 formed in the second fitting surface 56 in FIG.
May be up to a position before the stroke end of the movable iron core 11. In this case, at the rear end of the second fitting surface 56 where the oil groove 57 is not formed, the inflowing oil is stored and serves as a damper, so that the movable iron core 11 collides with the stopper 54. Shock is reduced.

The oil flow path L formed in the bobbin 5
As shown in FIG. 4, as shown in FIG. 4, ribs 58 protruding inward are formed at equal intervals along the axial direction on the first fitting surface 55, and are formed on the second fitting surface 56 along the axial direction. Alternatively, the ribs 59 protruding inward may be formed at equal intervals. Then, the tips of the ribs 58 and 59 are formed in an arc surface, and the fixed iron core 9 is fitted to the arc surface of the rib 58, and
If the movable iron core 11 is configured to be slidably fitted to the distal end face 59a of the arc surface, the space between the ribs 58 and the space between the ribs 59 are formed as the oil flow path L3.

The fixed core 9 is fitted to the first fitting surface 55 of the bobbin 5 as described above, and its rear end surface has a concave portion 9a and abuts against the front end surface of the second fitting surface 56, and is fixed. The front end face 9 projects forward from the coil housing wall 51 on the front end face of the bobbin 5. The protruding tip is formed with a step and is fitted with the holding spacer 17, and is inserted together with the holding spacer 17 into a hole 40 a formed in the valve body 40.

Further, a through hole 9b is formed in the axial center of the fixed iron core 9.
A movable pin 12 having one end abutting and connected to the distal end face of the movable core 11 and the other end abutting and connected to the spool 41 is slidably fitted. A rib 9c is formed on the rear end face of the fixed iron core 9 to reduce residual magnetism when releasing the suction from the movable iron core 11.

The movable core 11 is formed in a round shape so as to be slidably fitted to the second fitting surface 56 of the bobbin 5 as described above, and engages with the concave portion 9a of the fixed core 9 on the front end surface. A convex portion 11a is formed. A movable pin 12 formed in a round shape is connected to a distal end surface of the movable core 11, and the movable core 11
It is movably arranged with the sliding of. Then, the coil 7 is attracted to the fixed iron core 9 by the excitation, and the coil 7 is released from the excitation, whereby the bobbin 5 slides toward the rear wall 5a by the urging force of a spring (not shown).

As shown in FIGS. 1 and 2, a hole 40 a formed in the valve element 40 has a diameter larger than that of the fixed core 9 and
Is formed as a flow path L2 through which oil passes between the
The bottom surface is formed as a holding surface 40b of the fixed iron core 9. When the holding spacer 17 fitted to the fixed core 9 abuts on the holding surface 40b, the fixed core 9 is positioned and supported by the valve body 40.

As shown in FIG. 5, the holding spacer 17 has an outer peripheral surface formed in a wavy shape, and a plurality of tip projections 17a are supported in contact with the holding surface 40b of the valve body.
The space between 7a and 17a is formed as the flow path L1.

The holding spacer may be a ring-shaped holding spacer 18 as shown in FIG. In this case, if a plurality of small circles 18b are formed in the annular main body 18a, the small circles 18b are formed as the flow path L1.

The solenoid 1 configured as described above
The movable pin 12 is inserted into the through-hole 9 b of the fixed core 9, and one end is connected to the end face of the movable core 11 and the other end is brought into contact with the end face of the spool 41. 40a, and the flange 3 of the outer case 3
a is attached to the valve body 40 so that the hydraulic solenoid valve B
Is configured. When the coil 7 is excited, a magnetic field is generated in the fixed core 9, the movable core 11, the yoke 13, and the outer case 3, and the movable core 11 moves in a direction to be attracted to the fixed core 9, and the concave portion 9 a of the fixed core 9 is formed. The convex part 11 of the movable iron core 11
a, and the movable pin 12 is
To release the hydraulic flow path in the valve body 40 to perform hydraulic operation. At this time, the oil L flowing from the inside of the valve body 40 flows into the flow path L2 between the hole 40a of the valve body 40 and the fixed iron core 9 through the flow path L1 of the holding spacer 17 as shown in FIG. ,
The air is supplied to the movable iron core 11 through a flow path L3 (oil groove 57) formed in the bobbin 5.

When the excitation of the coil 7 is released, the magnetic field is demagnetized between the fixed iron core 9 and the movable iron core 11, so that the movable iron core 11 is separated from the fixed iron core 9 via the pin by a spring (not shown). When the movable pin 12 and the spool 41 return together, the spool 41 closes the hydraulic passage and stops the operation of the hydraulic pressure.

Accordingly, in the solenoid 1, since the bobbin 5 is integrally formed in a cylindrical shape with the rear wall 5a at the rear end, conventional pipes, stoppers, and nuts can be omitted. The movable iron core and the movable pin are manufactured in an inexpensive shape without an oil groove by disposing a holding spacer 17 fitted to the fixed iron core 9 and forming an oil flow path on the inner peripheral surface of the bobbin 5. be able to. In addition, only one seal member for the oil flowing into the solenoid 1 is provided on the O-ring 15 provided on the tip end surface of the bobbin 5 and the mounting surface of the valve element 40, and the cost is reduced in this respect as well. be able to.

In the above embodiment, the tube arranged in the solenoid is formed of a resin molded bobbin.
The present invention is not limited to this, and may be, for example, a pipe body housed in a bobbin and formed by resin molding. In that case, it is desirable to seal between the bobbin and the pipe with an O-ring.

[0031]

According to the present invention, a solenoid for a hydraulic solenoid valve comprises: a fixed iron core; a movable iron core slidably disposed on the fixed iron core by exciting a coil; and a tip end of the movable iron core. And a movable pin connected to a spool in the hydraulic valve body.The movable core and the fixed core are configured so that a tip end of the fixed core is supported by the valve body. A tube is provided inside and is formed such that the side opposite the valve body is closed, and an inner peripheral surface of the tube has an oil groove formed along the axial direction. On the other hand, the fixed core is inserted into the valve body, and a holding spacer that is supported in contact with the valve body is disposed at a tip end of the fixed core. The holding spacer is provided with the spool. A flow path through which the oil flowing in from the side passes is formed. Therefore, when the movable iron core slides, the oil flowing from the valve element passes through a flow path formed in the holding spacer, a hole formed in the valve element, and a flow path formed between the fixed iron core, Circulated through an oil groove formed in the tube.
Therefore, it can be manufactured at low cost without having to make an oil groove in the movable iron core or the movable pin. Furthermore, since the tube with one end closed does not require a conventional nut or stopper, the number of parts can be reduced, and the cost can be reduced.

If the tube disposed in the solenoid for a hydraulic solenoid valve is a bobbin which is wound around the coil and has a rear wall and is closed with a rear wall, a conventional pipe is interposed. Because there is no, the number of parts can be further reduced.

If the outer peripheral surface of the holding spacer is formed in a wavy shape, a flow path can be easily formed, and oil can flow into the solenoid.

Further, if the holding spacer is formed in an annular shape and a plurality of holes are formed in the annular portion main body, a flow path is similarly formed.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a solenoid for a hydraulic solenoid valve according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view showing a flow path around a fixed iron core in FIG. 1;

FIG. 3 is a view showing a cross section of the bobbin in FIG. 1;

FIG. 4 is a view showing a cross section of a bobbin of another form in FIG. 3;

5 is a sectional view taken along line IV-IV in FIG.

FIG. 6 is a sectional view showing another embodiment of FIG. 5;

FIG. 7 is a sectional view showing a conventional solenoid.

FIG. 8 is a sectional view showing a conventional movable pin.

FIG. 9 is a sectional view showing a conventional movable iron core.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Solenoid 3 ... Outer case 3 ... Rear wall 5 ... Bobbin (tube) 5a ... Rear wall 5b ... Stopper part 7 ... Coil 9 ... Fixed iron core 11 ... Movable iron core 12 ... Movable pin 13 ... Yoke 17, 18 ... Holding spey C 40 ... valve element 41 ... spool L1, L2, L3 ... flow path B ... hydraulic solenoid valve

Claims (4)

[Claims] 1. A fixed core, a movable core slidably disposed with respect to the fixed core by exciting a coil, and a movable core disposed at a tip end of the movable core and connected to a spool in a hydraulic valve body. A movable pin, and a solenoid for a hydraulic solenoid valve configured such that a distal end portion of the fixed iron core is supported by a valve body, wherein the movable iron core and the fixed iron core are disposed inside and a counter valve is provided. A tube formed so that the body side is closed is disposed, an inner peripheral surface of the tube has an oil groove formed along an axial direction, and the fixed iron core is inserted into the valve body. A holding spacer, which is supported in contact with the valve body, is provided at a distal end portion of the fixed iron core. The holding spacer has a flow passage through which the oil flowing in from the spool side passes. Solenoid for hydraulic solenoid valve . 2. The solenoid for a hydraulic solenoid valve according to claim 1, wherein the tube is formed as a bobbin around which the coil is wound and a rear portion is closed with a rear wall. 3. The holding spacer is fitted and held at a tip end of the fixed core, and an outer peripheral surface of the holding spacer is formed in a wave shape so as to form a flow path. Item 3. A solenoid for a hydraulic solenoid valve according to item 1 or 2. 4. The holding spacer is fitted and held at the tip of the fixed iron core and is formed in an annular shape, and a plurality of flow passage holes are formed in an annular main body portion of the holding space. 3. The solenoid for a hydraulic solenoid valve according to claim 1, wherein: