JPH10261519A - Electromagnet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnet having a simple structure, low manufacturing cost for providing a shockless low-cost electromagnetic valve and good compatibility. SOLUTION: An electromagnet 1 comprises a coil 7 in a case, a fixed magnetic pole 9 in the coil 7, and a movable plunger 13 slidable to and from the fixed magnetic pole 9. The plunger 13 has a main body 14 having an axial large-diameter oil hole 14b, and an auxiliary plate 15 fixed to the opposite side of the body 14 to the attraction side. The plate 15 has a small throttle hole 15a facing the oil hole of the body 14. Oil flowing from a valve body 25 via a passage 9a of the fixed magnetic pole and the oil hole 14b of the plunger to the throttle hole 15a to reduce the flow rate and reaches an oil pot 23, thus moving the plunger 13 at a slow slide speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnet mounted on an electromagnetic valve, and more particularly, to a method of slowly moving a movable plunger.

[0002]

2. Description of the Related Art Normally, a solenoid valve has a valve body having a spool and an electromagnet mounted on the valve body, and is movable by sliding a movable plunger disposed in the electromagnet. Move the spool connected to the plunger. By moving the spool, the flow path of the oil flowing in the valve body can be opened and closed, and the actuator connected to the valve body is operated. At this time, the oil in the valve body also flows to the electromagnet side, and serves to lubricate the movable plunger.

Conventionally, as shown in FIG. 7, a movable plunger of an electromagnet has an oil groove 52 formed in an end face of a movable plunger 51 so as to penetrate in the axial direction. Since the groove of the oil groove 52 is relatively large, and lubricates the outer peripheral surface of the movable plunger 51, and the oil flow is good, the movable plunger 51 can slide at a relatively high speed together with the excitation of the coil.

[0004]

However, the actuator connected to the solenoid valve has various uses, for example,
The operating body operated by the actuator is moved with a quick movement, or conversely, a slow movement (shockless function) is required to reduce an impact. Especially,
Conventionally, an electromagnetic valve that requires a slow movement has formed a shockless function in a valve mechanism in the valve body.
However, an electromagnetic valve that forms a shockless function on the valve body side is positioned as a special electromagnetic valve, and a complicated mechanism must be provided, leading to an increase in cost and poor compatibility.

An object of the present invention is to provide an electromagnet which has a simple structure and can be manufactured at a low cost in order to provide an inexpensive solenoid valve having a shockless function and having good compatibility. With the goal.

[0006]

An electromagnet according to the present invention has the following configuration to solve the above-mentioned problems. That is, an electromagnet having a movable plunger which is mounted on the valve body and has an oil passage communicating with the valve body, and which is slidable so as to approach and separate from the fixed magnetic pole. And an oil passage penetrating therethrough is formed, and a throttle hole for reducing the flow rate of oil is formed in the oil passage.

The electromagnet has an oil passage mounted on the valve body of the electromagnetic valve and communicating with the valve body, and has a movable plunger slidable so as to approach and separate from the fixed magnetic pole. The plunger has a plunger main body and an auxiliary body disposed on the non-adsorption side end face of the plunger main body, and a large-diameter oil hole penetrating in the axial direction is formed in the plunger main body; A throttle hole is formed in the auxiliary body at a position smaller in diameter than the oil hole and opposed to the oil hole so as to penetrate in the axial direction.

Further, the electromagnet has an oil passage mounted on the valve body of the electromagnetic valve and communicating with the valve body, and has a movable plunger slidable so as to approach and separate from the fixed magnetic pole. And the movable plunger
An oil passage penetrating in the axial direction is formed, and the oil passage has a large-diameter oil hole and a throttle hole connected to the oil hole and formed to have a smaller diameter than the oil hole. May be used.

[0009]

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, an electromagnet 1 according to the present embodiment has a case body 3 formed of resin, and a hollow coil body 7 having a coil 5 and a bobbin 6 and arranged in the case body 3.
And a fixed magnetic pole 9 fixedly disposed in the coil body 7, and a movable plunger 13 guided by a pipe 11 disposed in the coil body 7 and slidably moved toward and away from the fixed magnetic pole 9. And a yoke 16 disposed around the coil body
And Furthermore, one end is movable plunger 13
The pin 17 which is in contact with the suction side surface and whose other end is in contact with the spool 27 of the valve body 25 is disposed in the fixed magnetic pole 9.

The movable plunger 13 of the first embodiment has a plunger main body 14 having a suction surface 14a for the fixed magnetic pole 9 and an auxiliary plate 15 attached to the anti-adsorption surface of the plunger main body 14 by being attached thereto. The plunger body 14 is formed in a cylindrical shape so as to be slidable in the pipe 11, and the plunger body 14 has a plunger body 14.
An oil hole 14b is formed in the axial direction so as to penetrate through. The auxiliary plate 15 is, as shown in FIGS.
A throttle hole 15a is formed at substantially the same diameter as the plunger main body 14 and faces the oil hole 14b formed in the plunger main body 14 so as to penetrate the auxiliary plate 15. The throttle hole 15a formed in the auxiliary plate 15 is formed so as to reduce the flow rate through which the oil passes, which is smaller than the oil hole 14b formed in the plunger body 14.

As shown in FIG. 3, the pins 17 disposed in the fixed magnetic pole 9 have cutout faces 17 on both sides of the round outer peripheral face.
a is formed, and the cutout surface 17a forms the fixed magnetic pole 9
An oil flow passage 9a is provided between the pin 17 and the cutout surface 17a of the pin 17.

Above the auxiliary plate 15 of the movable plunger 13 (see FIG. 1), a cap 11 is screwed into a pipe 11 projecting outward from the case body 3 so as to close a hollow portion of the case body 3. An adjustment pin 21 for adjusting the position of the movable plunger 13 is provided in the cap 19. The space between the auxiliary plate 15 and the cap 19 is formed as an oil sump 23.

As shown in FIG. 3, the flow of the oil O is such that the oil O flowing in the valve body 25 flows from the electromagnet 1 side of the spool 27 toward the electromagnet 1 and is disposed in the fixed magnetic pole 9 and the fixed magnetic pole 9. After passing through an oil hole 14b of the plunger body 14 through a flow path 9a formed between the cutout surface 17a of the pin 17 and the oil sump 23 while the flow rate is reduced by a throttle hole 15a of the auxiliary plate 15, Is stored in In addition, the oil O passes through the outer peripheral surface of the plunger main body 14 from the flow path 9 a of the fixed magnetic pole 9, thereby serving to lubricate the sliding of the plunger main body 14. Then, the sliding of the movable plunger 13 causes the oil O to flow along the respective flow paths between the end of the spool 27 of the valve body 25 on the side of the solenoid valve 1 and the space 23. At this time, the sliding speed of the movable plunger 13 is reduced by reducing the flow rate of the oil through the throttle hole 15a of the auxiliary plate 15. Therefore, by mounting the electromagnet 1 in the solenoid valve, a solenoid valve having a shockless function can be manufactured. The throttle hole formed in the movable plunger is not limited to the above-described embodiment, and the second hole shown in FIG. It may be in a form. The movable plunger 31 has a large-diameter oil hole 32 formed in parallel with the axial direction, and an adsorbing surface 31 of the movable plunger 31 which is connected to the fixed magnetic pole 9.
Throttle hole 33 smaller in diameter than oil hole 32 formed toward the side
And are formed. The throttle hole 33 has a significantly shorter length than the oil hole 32. The oil O in this form flows into the outer peripheral surface of the movable plunger 31 from the flow path 9 a formed between the fixed magnetic pole 9 and the pin 17, passes through the throttle hole 33 of the movable plunger 31, and passes through the oil hole 32. The oil passes through the oil sump 23. Oil O is squeezed hole 3
When the oil passes through the movable plunger 3
(1) Slow down the sliding speed. In this case, the throttle hole 32 may be formed on the side of the movable plunger 31 opposite to the suction surface.

Further, as shown in FIG. 6, a large-diameter oil hole 42 penetrating the movable plunger 41 in parallel with the axial direction is formed in the movable plunger 41, and a small-diameter throttle hole 43a is formed in the oil hole 42. The formed throttle member 43 may be embedded at any position in the oil hole 42.

In the movable plunger 13 of the first embodiment, when adjusting the slow speed of the movable plunger 13, an auxiliary plate 15 having an appropriately sized aperture 15a can be attached to the plunger body 14. Therefore, it can be easily adjusted at a low cost.

Further, in the movable plunger 31 of the second embodiment, the movable plunger 31 can be easily manufactured without requiring an auxiliary plate, so that a compact electromagnet can be provided.

[0018]

According to the electromagnet of the present invention, the electromagnet has an oil passage mounted on the valve body and communicating with the valve body, and has a movable plunger slidable so as to approach and separate from the fixed magnetic pole. An oil passage penetrating in the axial direction in the movable plunger, and a throttle hole for reducing the flow rate of oil is formed in the oil passage. Therefore, the shockless function can be provided not on the valve body side of the solenoid valve but on the electromagnet side, so that it is possible to provide a solenoid valve which is highly compatible and can be manufactured at low cost.

In this electromagnet, the plunger is
A large-diameter oil hole is formed in the plunger body in the axial direction, the large-diameter oil hole being formed in the plunger body. The oil hole is formed in the auxiliary body. Since a throttle hole having a smaller diameter and penetrating in the axial direction is formed at a position facing the oil hole, a shockless function can be provided on the electromagnet side of the solenoid valve, and a further appropriate size can be provided. The sliding speed of the movable plunger can be adjusted as necessary by replacing the auxiliary plate having the aperture hole. Therefore,
The solenoid valve provided is well compatible and can be manufactured at low cost.

Further, in this electromagnet, the oil passage formed in the movable plunger has a large-diameter oil hole, and a throttle hole connected to the oil hole and formed with a smaller diameter than the oil hole. Due to this feature, the shockless function can be arranged on the electromagnet side of the solenoid valve, and a more compact movable plunger can be used. Therefore, a compact solenoid valve with good compatibility can be provided.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a plane of an auxiliary plate in FIG. 1;

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

FIG. 4 is a diagram schematically showing the flow of oil in a solenoid valve using the electromagnet of FIG. 1;

FIG. 5 is a view showing another embodiment of the movable plunger.

FIG. 6 is a view showing still another embodiment of the movable plunger.

FIG. 7 is a diagram showing a cross section of a conventional movable plunger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Electromagnet 3 ... Case body 5 ... Coil 6 ... Bobbin 7 ... Coil body 9 ... Fixed magnetic pole 9a ... Flow path 13, 31, 41 ... Movable plunger 14 ... Plunger main body 14b, 32, 42 ... Oil hole 15 ... Auxiliary plate 15a , 33, ... throttle hole 17 ... pin 23 ... oil reservoir 25 ... valve element 27 ... spool 43 ... throttle valve 43a ... throttle hole

Claims (3)

[Claims] 1. An electromagnet having an oil passage mounted on a valve body of an electromagnetic valve and communicating with the valve body, and having a movable plunger slidable toward and away from a fixed magnetic pole. An electromagnetic valve, wherein an oil passage penetrating in the axial direction is formed in the plunger, and a throttle hole for reducing the flow rate of oil is formed in the oil passage. 2. An electromagnet having a movable plunger mounted on a valve body of an electromagnetic valve and having an oil passage communicating with the valve body, and having a movable plunger slidable toward and away from a fixed magnetic pole. Has a plunger main body and an auxiliary body disposed on the anti-adsorption side end face of the plunger main body, and a large-diameter oil hole penetrating in the axial direction is formed in the plunger main body. An electromagnet, wherein a throttle hole that has a smaller diameter than the oil hole and that penetrates in the axial direction is formed at a position facing the oil hole. 3. An electromagnet having an oil passage mounted on a valve body of an electromagnetic valve and communicating with the valve body, and having a movable plunger slidable so as to approach and separate from a fixed magnetic pole. An oil passage penetrating in the axial direction is formed in the plunger, and the oil passage has a large-diameter oil hole and a throttle hole connected to the oil hole and formed with a smaller diameter than the oil hole. Solenoid valve characterized by the above.