JPH1167529A - Solenoid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid which can prevent the loosening of a nut, when a coil ass'y and a tube ass'y are fixed with the nut. SOLUTION: A solenoid 1 has an outer case 3, a coil ass'y housed in the case 3, and a tube ass'y 9 passed through the coil ass'y 5. The coil ass'y 5 has a hollow bobbin 6 and a coil 7 wound around the bobbin 6, and the tube ass'y 9 has a fixed core 10 arranged on the front side, a pipe 14 which is formed closed when a stopper 16 is fixed to the rear end section of the pipe 14, and a movable core 12 which is arranged in the pipe 14 in a slidable state. The stopper 16 is protruded backward from the outer case 3 and has a male screw 16a. A nut 19 is engaged with the male screw 16a, and an elastic collar 20 which is bent so that its both end sections 20a are opened outward is provided between the rear wall 3b of the case 3 and the nut 19. When the nut 19 is tightened, the both end sections 20a of the collar 20 bend in the axial direction and prevent the loosening of the nut 19.

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, the movable iron core being attracted to and moved by the excitation of the coil. The present invention relates to a solenoid of a type in which a tube assembly having a movable iron core is fixed with a nut.

[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. In general, push type solenoids are widely used.

As shown in FIG. 4, a conventional general push type solenoid 21 includes an outer case 23, a coil assembly 25 and a yoke 2 disposed in the outer case 23.
8 and a tube assembly 29 housed in the coil assembly 25. The outer case 23 is formed to have a substantially U-shaped cross section of a magnetic body, and a hole 23a through which the tube assembly 29 is inserted is formed in the rear end surface.

The coil assembly 25 is 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.

[0005] The tube assembly 29 includes a fixed iron core 30.
And fixedly attached to the fixed iron core 30, and a stopper 3 is provided at the rear end.
6 has a pipe 34 fixed by welding and a movable iron core 32 slidably disposed in the pipe 34. The fixed iron core 30 is formed to be attached to the valve body B, and has a movable pin 33 connected to a spool (not shown) of the valve body B inserted therein. The stopper 36 fixed to the pipe 34 is disposed so as to protrude from the rear end surfaces of the coil assembly 25 and the outer case 23, and a male screw 36a is formed at the rear end of the protruding portion, and the nut 37 is screwed.

The thus constructed tube assembly 2
9 is inserted rearward from the distal end side of the coil assembly 25. Then, a cylindrical collar 38 made of a non-magnetic material is arranged around the stopper 36 on the male screw portion 36a of the stopper 36 protruding from the outer case 23, and then the collar 38 is screwed with the nut 37 screwed to the male screw 36a. By pressing, the tube assembly 29 and the coil assembly 25 are fixed. The excitation of the coil 27 causes the outer case 23, the yoke 28, and the fixed iron core 3 to move.
0, since magnetic flux is generated between the movable core 32 and the movable core 3
2 is attracted to the fixed iron core 30.

[0007]

However, in a solenoid of the type in which the coil assembly 25 and the tube assembly 29 are fixed by a nut 37, the tightening of the nut 37 is transmitted through a collar 38 formed of a rigid body. Therefore, the nut 37 is easily loosened by the vibration. In particular, if the tightening force is small, the nut 37 is loosened during use, and looseness of the nut 37 causes play in the front-rear direction of the coil assembly, which may damage the coil assembly, and the tightening force is too large. This may cause the male screw 36a or the outer case 23 to be damaged during tightening.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a solenoid capable of preventing a nut for fixing a coil assembly and a tube assembly from loosening.

[0009]

Means for Solving the Problems A solenoid according to the present invention is configured as follows to solve the above-mentioned problems. That is, a magnetic outer case 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, and a movable iron core approaching and separating from the fixed iron core. And a tube assembly that supports a front end surface of the coil assembly and is disposed so as to pass through the coil assembly, and the fixed core is disposed behind the movable iron core, A solenoid configured to have a screw portion projecting rearward from the outer case and the coil assembly, wherein a nut is screwed to the screw portion to fix the coil assembly and the tube assembly together, A collar having elasticity in the axial direction is disposed between the rear wall and the nut.

Preferably, the collar is formed in a thin cylindrical shape, and one or both ends of the collar are formed so as to open outward over the entire circumference. .

Further, the collar may be formed in a cylindrical shape, and a slit-shaped hole may be formed in the collar along a circumferential direction.

[0012]

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 includes an outer case 3, a hollow coil assembly 5 housed in the outer case 3, a tube assembly 9 inserted in the coil assembly 5, and an outer case 3. It has a yoke 8 disposed between the rear end of the case 3 and the rear end face of the coil assembly 5. The yoke 8 is elastic so that the coil assembly 5 and the tube assembly 9 are pressed against each other at the rear end of the outer case 3. Is fixed by a nut 19 via a collar 20 having

The outer case 3 is made of a magnetic material, and has a rear wall 3b having an opening at the front end (lower side in FIG. 1) and a hole 3a at the rear end (upper side in FIG. 1) for inserting the tube assembly 9. 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 contacts the rear end face of the rear coil storage wall 6b,
Furthermore, the rear wall 3b of the outer case 3 is disposed so as to contact the rear end face.

The tube assembly 9 includes a fixed iron core 10 and
A pipe 14 fitted and fixed to the fixed core 10 and having a stopper 16 welded to the rear end thereof, and a movable core 32 slidably disposed in the pipe 14 to be integrally formed. Have been.

The fixed iron core 10 has an attachment portion 10b attached to the valve body B and having an external thread 10a formed thereon, and a flange portion 10c formed so as to press the coil housing wall 6a of the bobbin 6 from the front end side. And is disposed on the tip side of the bobbin 6. A movable pin 13 connected to a spool (not shown) of the valve body B is slidably inserted through the fixed iron core 10. The pipe 14 is formed of a non-magnetic material, one end is fitted and fixed to the rear end of the fixed iron core 10, the movable iron core 12 is slidably disposed inside, and the other end is fixed by welding with a stopper 16. Then the back is closed. Movable iron core 12
Is connected to the movable pin 13 at the tip end surface so as to slide in the pipe 14, and the stopper 16 is connected to the coil assembly 5.
And, it is arranged so as to protrude from the rear end surface of the outer case 3, a male screw 16 a is formed at the rear end of the protruding portion, and the nut 19 is screwed. An elastically formed collar 20 is arranged between the nut 19 and the rear wall 3b of the outer case 3.

As shown in FIG. 2, the collar 20 is formed by bending a cylindrical thin pipe so that both end portions 20a open outward over the entire circumference.
The nut 19 is screwed to the stopper 16 so as to sandwich the collar 20. Since both ends 20a of the collar 20 are formed to have elasticity and bend outward when pressure is applied inward in the axial direction, when the nut 19 is tightened, the both ends 20a function as a screw stop. Become.

Although the collar 20 in the above embodiment is formed to be bent so that both ends are opened outward, the same applies when the collar 20 is formed to be bent so that either end is opened outward. You can play a role.

A commercially available nut 19 (magnetic material) is screwed into the male screw 16 a of the stopper 16, and the coil assembly 5 and the tube assembly 9 are fixed by tightening the nut 19 through the collar 20.

The solenoid 1 accommodates the coil assembly 5 configured as described above from the front side of the outer case 3, inserts the tube assembly 9 from the front end side of the coil assembly 5, and then moves the collar 20 around the stopper 16. And tightened with a nut 19. On this occasion,
The front end face of the outer case 3 is
c is located at substantially the same position as the front end face, and is attached to the attachment surface of the valve body B.

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 yoke 8, the fixed iron core 10, and the movable iron core 12, and the movable iron core 12 slides in the pipe 14 and is attracted to the fixed iron core 10 to form a magnetic circuit. . Simultaneously, when the movable pin 13 arranged at the front end of the movable core moves forward in the fixed core 10, the spool in the valve body B connected to the movable pin 13 is pressed and moved, and the oil flow path To release the hydraulic pressure.

When the excitation of the coil 7 is released,
The magnetic flux formed on the outer case 3, the yoke 8, the fixed iron core 10, and the movable iron core 12 is demagnetized and the magnetic path disappears. 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, the solenoid 1 is connected to the nut 19
When the coil assembly 5 and the tube assembly 9 are fixed to each other by tightening the
9 can be locked.

The color 20 is not limited to the above-described embodiment, but may be a color 40 as shown in FIG. Color 40
Is formed in a cylindrical shape, and a plurality of (two in this embodiment) slit holes 41 are formed in two steps in the main body of the collar 40 along the circumferential direction. This slit hole 41 is provided with a collar 40
It is formed to have elasticity in the up-down direction when a load is applied in the front-rear direction. Therefore, it is desirable that the slit holes 41 are formed to have a uniform length in a direction perpendicular to the axis, and that the upper and lower slit holes 41 are alternately arranged.

Further, the solenoid of the present invention is not limited to the above, and can be used with a pull-type solenoid or a coil-assembled resin as long as the coil assembly and the tube assembly are fixed with a nut. it can.

[0027]

According to the present invention, a solenoid comprises a magnetic outer case having a rear wall at a rear end, a hollow coil assembly housed in the outer case having a bobbin and a coil, and a fixed iron core. And a movable core that approaches and separates from the fixed core, and a tube assembly that supports a front end surface of the coil assembly and is arranged to pass through the coil assembly. The fixed iron core is disposed behind the movable iron core, and has a screw portion protruding rearward from the outer case and the coil assembly. A nut is screwed to the screw portion, and the coil assembly and the tube are mounted. It is configured to secure the assembly. Further, a collar having elasticity in the axial direction is disposed between the rear wall of the outer case and the nut. Therefore, even if vibration occurs during use after tightening, the vibration can be absorbed by the collar, which can greatly help prevent the nut from loosening.

Further, if the collar is formed in a thin cylindrical shape and has a bent portion that opens outward at one end or both ends, it can be manufactured by press working and can be inexpensive.

Further, if slits are formed in the collar along the circumferential direction, the collar is configured to have elasticity in the vertical direction, so that vibration can be absorbed.

[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 perspective view showing a collar in FIG. 1;

FIG. 3 is a perspective view showing another form of the collar in FIG. 2;

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 7 ... Coil 9 ... Tube assembly 10 ... Fixed iron core 12 ... Movable iron core 13 ... Movable pin 14 ... Pipe 16 ... Stopper 16a ... Male thread part 19 ... Nut 20: Collar 20a: End portion 40: Collar 41: Slit hole B: Valve body

Claims (3)

[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 having a bobbin and a coil; a fixed core and a distance from and away from the fixed core; And a tube assembly that supports the front end face of the coil assembly and is disposed so as to pass through the coil assembly.The fixed core is disposed behind the movable core. A solenoid that has a screw portion projecting rearward from the outer case and the coil assembly, and a nut is screwed to the screw portion to fix the coil assembly and the tube assembly together, A solenoid, wherein a collar having elasticity in an axial direction is disposed between a rear wall of the outer case and the nut. 2. The collar is formed in a thin cylindrical shape,
2. The solenoid according to claim 1, wherein one or both ends of the collar are formed so as to open outward over the entire circumference. 3. The solenoid according to claim 1, wherein the collar is formed in a cylindrical shape, and a slit-shaped hole is formed in the collar along a circumferential direction.