JPH1167533A - Method for fixing coil ass'y and tube ass'y of solenoid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for fixing coil ass'y and tube ass'y of a solenoid through which the cost of a solenoid can be reduced by simplifying the tube ass'y of the solenoid. SOLUTION: A solenoid has an outer case 3, a coil ass'y 5, and a tube ass'y 9. The tube ass'y 9 has a pipe 14, the rear end face of which is closed, and a fixed core 10 is fixed to the rear end section of the tube ass'y 9. A movable core 12 is arranged in the pipe 14 slidably in the front of the fixed core 10. The pipe 14 is fixed by forming a recessed section 14c by press-contacting the outer peripheral surface of the pipe 14 with the fixed core 10, and a flange section 14b is formed on the front end face of the pipe 14. When the solenoid is mounted on a valve element 40, the tube ass'y 9 is inserted into the tube hole 41 of the valve element 40, and then the tube ass'y 9 is supported by attaching a base body 16 to the valve element 40 so as to check the flange section 14b of the pipe 14. Thereafter, the coil ass'y 5 is fixed to the tube ass'y 9 by mounting the coil ass'y 5, a yoke 8, and the outer case 3 on the tube ass'y 9 and engaging a C-shaped retaining ring 18 with the recessed section 14c of the pipe 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid which has a coil assembly and a tube assembly, and which operates so that a movable core in a tube assembly excited by a coil in the coil assembly is attracted and moved to a fixed core. ,
Further, the fixed core is disposed behind the movable core, and the coil assembly and the tube assembly are fixed to a solenoid configured to pull the spool of the hydraulic valve body when the movable core is attracted to the fixed core. About the method.

[0002]

2. Description of the Related Art Generally, in a solenoid that has a fixed iron core and a movable iron core and slides so that the movable iron core approaches and separates from the fixed iron core, for example, a spool of a hydraulic valve is moved, the movable iron core is fixed. There are known a push type in which a spool connected to a movable pin of a movable core is moved when attracting the core, and a pull type in which the spool is pulled and moved. In general, a push-type solenoid is configured such that a movable iron core is arranged behind a fixed iron core, a movable pin is arranged on a suction surface side of the movable iron core, and is inserted through the fixed iron core and connected to a spool. In general, a pull-type solenoid is configured such that a fixed iron core is arranged behind a movable iron core, and a movable pin is arranged on a side of the movable iron core facing an attraction surface, and is connected to a spool.

A conventional general pull type solenoid 2
1 is an outer case 23 and an outer case 2 as shown in FIG.
Coil assembly 25 and yoke 28 arranged in 3
And a tube assembly 29 housed in the coil assembly 25.

[0004] Coil assembly 25 and tube assembly 2
9 is fixed to the rear end face of the coil assembly 25 and the outer case 23 inserted through the tube assembly 29.
The nut 37 is screwed into a threaded portion formed at the rear end of the tube assembly 29 by interposing the nut 8 and tightening.

The coil assembly 25 has a hollow bobbin 26
And a coil 27 wound around the bobbin 26, and the tube assembly 29 is inserted into the hollow bobbin 26.

[0006] The tube assembly 29 includes a fixed iron core 30.
And a movable core holding member 3 for accommodating the movable core 32 therein.
4 and a non-magnetic pipe 36 that integrally connects the fixed core 32 and the movable core holding member 34. The fixed iron core 30 fits into the bobbin 26, and a rear portion protrudes from the outer case 23.
The male screw 34a attached to the hydraulic valve body 40 is formed at the distal end of the movable core holding member 34, and the flange 34b that supports the coil assembly 25 from the front end surface is formed.

Coil assembly 25 and tube assembly 2
The solenoid 21 integrally fixed to the hydraulic valve body 9 is attached to the hydraulic valve body 40 by screwing the male screw 34b of the tube assembly 29 to the hydraulic valve body 40. At this time, the movable pin 33 fixed to the distal end of the movable iron core 32 is connected to a spool (not shown) provided in the valve body 40.

[0008] When the coil 27 is excited, a magnetic flux is generated between the outer case 23, the yoke 28, the fixed iron core 30, and the movable iron core 32, so that the movable iron core 32 is attracted to the fixed iron core 30, Is moved.

[0009]

However, when price competition intensifies, it is necessary to reduce the cost of the solenoid, and the structure or each component must be reviewed. In particular, in the solenoid 21 described above, a method of fixing the coil assembly 25 and the tube assembly 29 is such that a nut 37 is screwed onto a male screw 30 a formed on the fixed iron core 30, and a collar 38 is interposed between the nut 37 and the outer case 23. Was done by that. The outer case 23 is made of a magnetic iron, and the collar 38 is generally a resin pipe. Since the nut 37 has a small thickness with respect to the screw diameter, it has been manufactured as a dedicated nut by machining. Therefore, by improving the means for fixing the coil assembly 25 and the tube assembly 29,
It has been desired to reduce costs.

SUMMARY OF THE INVENTION The present invention solves the above-described problems. In a pull-type solenoid, the number of parts is reduced by simplifying the tube assembly and improving the method of fixing the coil assembly to the tube assembly. It is still another object of the present invention to provide a method of fixing a coil assembly and a tube assembly of a solenoid that can securely attach the solenoid to a hydraulic valve body.

[0011]

In order to solve the above-mentioned problems, a solenoid according to the present invention fixes a coil assembly and a tube assembly by the following method. That is, an outer case made of a magnetic material having a rear wall at the rear end,
A hollow coil assembly having a bobbin and a coil housed in the outer case, and a tube assembly having a fixed core disposed at a rear end and a movable core approaching and separating from the fixed core, The tube assembly is supported on a base body and attached to the valve body, and then the coil assembly and yoke and the outer case are sequentially mounted and attached to the valve body by a method of fixing the coil assembly and the tube assembly to the solenoid. The tube assembly has a pipe body that houses the fixed core and the movable core, and after the fixed core is disposed at the rear of the pipe body, the tube assembly is mounted on the outer peripheral surface of the pipe body. At about the same position as the rear end face of the outer case when pressed, so as to form a recess, and the fixed iron core is integrally fixed, and the coil assembly The yoke and the outer case, after mounting the tube assembly in order, by engaging the shaft for retaining ring in the recess of the pipe body, and is characterized in that to fix the coil assembly to the tube assembly.

Preferably, a front end face of the pipe body has a flange portion fitted into the valve body, and the base body is mounted on the valve body so as to support the flange portion. Good.

[0013]

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

As shown in FIG. 1, the solenoid 1 of this embodiment has an outer case 3, a hollow coil assembly 5 housed in the outer case 3, and a tube assembly 9 inserted into the coil assembly 5. doing.

The outer case 3 is made of a magnetic material, and has a rear wall 3b having a hole (a lower end in FIG. 1) and a hole 3a for inserting the tube assembly 9 at a rear end (upper in FIG. 1). ing.

The coil assembly 5 comprises a hollow bobbin 6 and a coil 7 wound around the bobbin 6,
The tube assembly 9 is inserted into the bobbin 6. The bobbin 6 is housed in the outer case 3, and coil housing walls 6 a and 6 b for housing the coil 7 are formed at both front and rear ends.
The yoke 8 is in contact with the rear coil housing wall 6b, and the rear wall 3b of the outer case 3 is in contact with the yoke 8.

The tube assembly 9 comprises a fixed iron core 10 and
It has a movable iron core 12 and a nonmagnetic pipe 14 in which the fixed iron core 10 and the movable iron core 12 are slidably disposed. The pipe 14 has a rear end closed with a rear wall 14a. And has a flange portion 14b at the distal end for supporting the distal end surface of the coil housing wall 6a, and is opened. And
The fixed iron core 10 is arranged at the rear end of the pipe 14, the movable iron core 12 is arranged at the front end of the fixed iron core 10, and a hydraulic valve body (hereinafter, referred to as a side facing the suction surface with the fixed iron core 10).
The movable pin 13 connected to a spool (not shown) of the valve body 40 is fixed.

The pipe 14 is formed to be longer than the outer case 3 so that its rear end can protrude from the outer case 3, and the fixed core 10 is integrally fixed thereto. The fixation between the pipe 14 and the fixed core 10 is performed by inserting the fixed core 10 into the pipe 14 and then pressurizing the outer peripheral surface of the pipe 14 so as to form a concave portion 14c in the axial direction. The position is such that after inserting the outer case 3 through the base body, the coil assembly 5 and the yoke 8, which will be described later, the approximate center position of the concave portion 14c is arranged at a position matching the rear end face of the rear wall 3b of the outer case 3. Is formed.

The flange 1 of the tube assembly 9 described above.
4b, the base body 16 attached to the valve body 40 is inserted from the rear side of the tube assembly 9 and the tube body 9 and the base body 16 are integrally formed by tightening the base body 16 and the valve body 40 with bolts. It is attached. As shown in FIG. 2, the base body 16 has a rectangular outer shape and a hole 16 into which the pipe 14 is fitted.
a are formed, and four valve body mounting holes are formed around the hole 16a.
Attached to.

The solenoid 1 is attached to the valve body 40 in the order described below, and is assembled by fixing the coil assembly 5 and the tube assembly 9 to each other.

The valve body 40 has a flange portion 14 of the pipe 14.
The tube hole 41 into which the b is inserted is formed so as to sit down from the mounting surface 40a of the valve body 40 toward the back side of the valve body,
On the counterbore surface, the oil inside the valve body 40 is
A ring 17 is arranged. First, a tube assembly 9 in which a fixed iron core 10 is fixed and a movable iron core 12 is stored.
Is inserted into the valve body 40 by fitting the flange portion 14a of the pipe 14 into the tube hole 41, and the hole portion 16a of the base body 16
Is inserted into the pipe 14 and attached to the valve body 40, the tube assembly 9 and the base body 16 are integrally attached to the valve body 40. In this state, the distal end surface of the movable pin 13 fixed to the movable iron core 12 abuts and is connected to a spool (not shown) in the valve body 40.

Subsequently, the coil assembly 5 composed of the coil 7 and the bobbin 6 is inserted so as to fit on the outer peripheral surface of the pipe 14 until the coil housing wall 6a of the bobbin 6 contacts the base body 16. Further, after the yoke 8 is inserted into the pipe 14 so as to contact the rear surface of the coil housing wall 6b on the rear side of the coil assembly 5, the outer case 3 is inserted through the pipe 14 so as to contact the rear surface of the yoke 8.

In this state, the recess 14c formed in the pipe 14 is located at substantially the same position as the end face of the rear wall 3b of the outer case 3, and as shown in FIG.
8 is fitted and engaged. Since the tube assembly 9 is supported by the base body 16 and the outer case 3 is positioned by the shaft C-shaped retaining ring 18 while the outer case 3 is pressing the base body 16 via the coil assembly 5 and the yoke 8, the outer case 3 Is fixed to the base body 16. Therefore, coil assembly 5
Is fixed to the tube assembly 9 supported by the base body 16.

In the solenoid 1 configured as described above,
When the coil 7 is excited, a magnetic flux is generated in the outer case 3, the fixed core 10, the movable core 12, and the base body 16, and the movable core 12 slides and is fixed in the movable core holding member 14 to form a magnetic circuit. Adsorb to the iron core 10. Simultaneously movable iron core 1
When the movable pin 13 disposed at the front end of the valve 2 moves backward, the spool in the valve body 40 connected to the movable pin 13 is pulled and moved, releasing the oil flow path and moving the hydraulic pressure. Let it.

When the excitation of the coil 7 is released,
Outer case 3, fixed iron core 10, movable iron core 19, base body 1
The magnetic flux formed in 6 is demagnetized and disappears the magnetic path.
Thereby, the movable iron core 12 is released from being attracted to the fixed iron core 10, and is returned by a spring (not shown). At the same time, the spool connected to the movable pin 13 also returns, and the movement of the hydraulic pressure is stopped by closing the opened flow path.

Therefore, in the solenoid 1, the tube assembly can be simplified and the coil assembly and the tube assembly can be performed by one C-type retaining ring as compared with the conventional solenoid, so that the cost can be reduced. In addition, the workability can be extremely simplified because the assembling can be performed at the same time as the mounting to the valve body.

In the above embodiment, the tube assembly 9 supported by the base body 16 is supported by the base body 16 at the flange portion 14c of the pipe 14. However, the present invention is not limited to this. Any shape may be used as long as the tube assembly 9 is supported by the valve body 40.

[0028]

According to the present invention, there is provided a method of fixing a coil assembly and a tube assembly in a solenoid according to the present invention, wherein the outer case is made of a magnetic material having a rear wall at a rear end and a bobbin and a coil housed in the outer case. A coil assembly, and a tube assembly having a fixed core disposed at a rear end and a movable core approaching and separating from the fixed core, the tube assembly being supported on a base body and mounted on a valve body. A method of sequentially attaching the coil assembly yoke and the outer case to a valve body, and attaching the coil assembly yoke and the outer case to a valve body, wherein the tube assembly has a pipe body for storing the fixed iron core and the movable iron core, After arranging the fixed iron core at the rear of the pipe body, the outer peripheral surface of the pipe body is provided with a recess at substantially the same position as the rear end face of the outer case when mounted. After installation in pressure contact to form integrally fixed to the fixed iron core, the coil assembly, the yoke and the outer casing, the tube assembly in order,
The coil assembly is fixed to the tube assembly by engaging a shaft retaining ring with the concave portion of the pipe body.

Therefore, in the solenoid 1, the tube assembly can be simplified and the coil assembly and the tube assembly can be performed by one C-type retaining ring as compared with the conventional solenoid, so that the cost can be reduced. In addition, the workability can be extremely simplified because the assembling can be performed at the same time as the mounting to the valve body.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a solenoid according to one embodiment of the present invention.

FIG. 2 is a plan view of a solenoid shown in FIG. 1;

FIG. 3 is a plan view showing a state where a C-shaped retaining ring for a shaft in FIG. 1 is engaged with a pipe.

FIG. 4 is a sectional view showing a conventional solenoid.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Solenoid 3 ... Outer case 3b ... Rear wall 5 ... Coil assembly 6 ... Bobbin 6a / 6b ... Coil storage wall 7 ... Coil 9 ... Tube assembly 10 ... Fixed iron core 10d ... Screw part 12 ... Movable iron core 13 ... Movable pin 14 ... Pipe 14b ... Flange part 16 ... Base body 18 ... C-shaped retaining ring for shaft 40 ... Valve body

Claims (2)

[Claims] An outer case made of a magnetic material having a rear wall at a rear end, a hollow coil assembly housed in the outer case and having a bobbin and a coil, a fixed iron core arranged at a rear end, and A tube assembly having a movable core that approaches and separates from the fixed iron core.The tube assembly is mounted on a valve body while supporting the tube assembly with a base body, and then the coil assembly yoke and the outer case are sequentially mounted. A method of fixing a coil assembly and a tube assembly in a solenoid attached to a valve body, wherein the tube assembly has a pipe body for housing the fixed iron core and the movable iron core, and the pipe body has After arranging the fixed iron core at the rear, the outer core of the outer case is pressed against the outer peripheral surface of the pipe body so as to form a concave portion at substantially the same position as the rear end surface of the outer case when mounted. The coil assembly, the yoke, and the outer case are sequentially attached to the tube assembly, and a shaft retaining ring is engaged with a concave portion of the pipe body. A method of fixing a coil assembly and a tube assembly in a solenoid, characterized in that the coil assembly is fixed to a tube assembly. 2. The solenoid according to claim 1, wherein a front end surface of the pipe body has a flange portion fitted into the valve body, and the base body is mounted on the valve body so as to support the flange portion. Method of fixing the coil assembly and tube assembly in the above.