JP2007285360A - Linear solenoid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce working accuracy, by preventing eccentricity of a clearance, by reducing the clearance between a magnetic delivery stator and a magnetic delivery yoke, by avoiding contact between the magnetic delivery stator and the magnetic delivery yoke. <P>SOLUTION: This linear solenoid 2 has a nonmagnetic member 24 composed of a nonmagnetic material of integrally arranging a clearance forming member 25, a plunger sliding cylinder 26 and an abutting preventive spacer 27. The contact between the magnetic delivery stator 19 and the magnetic delivery yoke 22 is surely prevented by the clearance forming member 25 inserted between the magnetic delivery stator 19 and the magnetic delivery yoke 22. The clearance α can be reduced since there is no need to excessively enlarge the clearance α by the clearance forming member 25. The eccentricity of the clearance α can also be surely prevented by the clearance forming member 25. Fitting accuracy of a yoke 15 and a stator core 16 in a front magnetic delivery part A can be further reduced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a linear solenoid provided with a plunger and a magnetic delivery stator that delivers a magnetic force in the radial direction, and a magnetic delivery yoke that carries out the magnetic delivery in the radial direction.
In particular, the present invention relates to a technique suitable for use in a linear solenoid having a structure in which a magnetic attraction stator and a magnetic delivery stator are integrally provided, the magnetic attraction stator side is fixed to a yoke, and the magnetic delivery stator side is inserted into the magnetic delivery yoke.

(Conventional technology)
The background art of the present invention will be described with reference to FIG. FIG. 3 shows an electrohydraulic control valve, and this electrohydraulic control valve includes a spool valve 1 and a linear solenoid 2 that drives the spool valve 1.
The linear solenoid 2 includes a coil 11, a plunger (magnetic mover) 12, and a magnetic stator 13. Here, the magnetic stator 13 is a component that forms a magnetic circuit around the coil 11, and includes a yoke 15 that covers the outer periphery of the coil 11 and a stator core 16 that is disposed inside the coil 11.

The stator core 16 includes a magnetic attraction stator 17 that attracts the plunger 12 in the axial direction by a magnetic force, a cylindrical magnetic delivery stator 19 that covers the periphery of the plunger 12, and between the magnetic attraction stator 17 and the magnetic delivery stator 19. A magnetoresistive portion 18 for blocking magnetism is integrally provided.
The plunger 11 is driven in the axial direction by controlling the supply current value of the coil 11, and the output hydraulic pressure is controlled by displacing the spool 4 of the spool valve 1 in the axial direction (for example, Patent Document 1). reference).

Here, of the magnetic delivery portions of the yoke 15 and the stator core 16, the yoke 15 and the stator core 16 are fixed by the magnetic delivery portion A on the front side (the magnetic attraction stator 17 side), and the magnetic delivery portion on the rear side (the magnetic delivery stator 19 side). A linear solenoid 2 for unfixing B has been proposed.
The linear solenoid 2 shown in FIG. 3 shows a specific example thereof. The stator core 16 is inserted from the cup opening of the yoke 15, and the yoke 15 and the stator core 16 are coupled to each other at the front magnetic transfer portion A. A configuration is adopted in which the rear magnetic delivery part B, which is the side away from the magnetic delivery part A, is not fixed.

(Problems of conventional technology)
As shown in FIG. 3 (b), the rear magnetic delivery part B is a part that delivers magnetism by the magnetic delivery stator 19 and a magnetic delivery yoke 22 provided at the cup bottom of the yoke 15. The magnetic delivery stator 19 is inserted and disposed inside the 22. Therefore, a clearance α for inserting the magnetic delivery stator 19 into the magnetic delivery yoke 22 is required between the magnetic delivery stator 19 and the magnetic delivery yoke 22 in the radial direction.
When such a clearance α is provided, there is a possibility that the magnetic delivery stator 19 and the magnetic delivery yoke 22 are partially in contact with each other due to variations in the components of the stator core 16 and shaft misalignment during assembly. When the magnetic delivery stator 19 and the magnetic delivery yoke 22 come into contact with each other, the magnetic flux locally passes through the contact portion, so that an excessive side force is generated in the plunger 12, the sliding resistance of the plunger 12 increases, and the response is greatly degraded. In addition, excessive hysteresis occurs.

For this reason, the radial direction between the magnetic delivery stator 19 and the magnetic delivery yoke 22 needs to be reliably non-contact over the entire circumference. Therefore, a clearance α of a size that secures a clearance width (safety margin) that absorbs the component variation of the stator core 16 and the shaft misalignment during assembly is provided between the magnetic delivery stator 19 and the magnetic delivery yoke 22 in the radial direction. Is required.
However, as the clearance α increases, the magnetic efficiency decreases, and the magnetic attraction performance of the plunger 12 decreases.

  Even if there is no contact over the entire circumference, if the clearance α is decentered due to component variations, shaft misalignment during assembly, etc., a large amount of magnetic flux flows through a small portion of the clearance α, and the clearance α on the opposite side The flow of magnetic flux is reduced at a large part. As a result, a side force biased with respect to the plunger 12 is generated, the sliding resistance of the plunger 12 is increased, the responsiveness is deteriorated, and the hysteresis is increased.

Furthermore, since it is necessary to make the fitting accuracy of the yoke 15 and the stator core 16 in the front magnetic transfer portion A extremely high so that the eccentricity of the clearance α does not occur as much as possible, the manufacturing cost increases.
JP 2004-144230 A JP 2005-188630 A

  The present invention has been made in view of the above problems, and its purpose is (1) to reliably avoid contact between the magnetic delivery stator and the magnetic delivery yoke, and (2) between the magnetic delivery stator and the magnetic delivery yoke. To provide a linear solenoid capable of reducing the clearance, (3) reliably preventing the eccentricity of the clearance, and (4) reducing the machining accuracy.

[Means of claim 1]
In the linear solenoid according to the first aspect of the present invention, since the clearance forming member made of a nonmagnetic material is sandwiched between the radial direction of the magnetic delivery stator and the magnetic delivery yoke, the following effects can be obtained.
(1) Since a clearance forming member made of a non-magnetic material is interposed between the magnetic delivery stator and the magnetic delivery yoke in the radial direction, it is possible to reliably avoid the problem of contact between the magnetic delivery stator and the magnetic delivery yoke. it can. As a result, a malfunction caused by the contact between the magnetic delivery stator and the magnetic delivery yoke (magnetic flux mainly passes through the contact portion, excessive side force is generated in the plunger, and the sliding resistance of the plunger is increased to improve the response. It is possible to avoid the problem of significant deterioration and occurrence of excessive hysteresis.

(2) Since a clearance forming member made of a non-magnetic material is interposed between the magnetic delivery stator and the magnetic delivery yoke in the radial direction, it is necessary to increase the clearance in order to absorb component variations and shaft misalignment during assembly. Therefore, the clearance can be made smaller than before. Thereby, the magnetic flux amount of the magnetic circuit through the clearance is increased, the magnetic efficiency of the magnetic circuit is increased, and the magnetic attraction performance of the plunger can be improved.

(3) The clearance forming member made of a nonmagnetic material can surely prevent the eccentricity of the clearance. As a result, defects caused by the eccentricity of the clearance (magnetic flux flows to the smaller clearance side, side force is generated in the plunger, the sliding resistance of the plunger is increased, the responsiveness is deteriorated, and the hysteresis is increased. Can be avoided.
(4) The clearance forming member made of a nonmagnetic material can surely prevent the eccentricity of the clearance. This makes it possible to reduce the assembling accuracy of the magnetic delivery stator and the magnetic delivery yoke, thereby reducing the manufacturing cost.

[Means of claim 2]
According to a second aspect of the present invention, the linear solenoid has a structure in which only the end portion on the side of the magnetic attraction stator is fixed to the yoke, and the magnetic delivery stator side is inserted and arranged on the inner peripheral surface of the magnetic delivery yoke.
However, since a clearance forming member made of a non-magnetic material is interposed between the magnetic delivery stator and the magnetic delivery yoke in the radial direction, as shown in the “means of claim 1”, (1) magnetic delivery The problem of contact between the stator and the magnetic delivery yoke can be reliably avoided, (2) the clearance between the magnetic delivery stator and the magnetic delivery yoke can be reduced, and (3) only the end portion on the magnetic attraction stator side is fixed to the yoke. Even in such a structure, the eccentricity of the clearance can be reliably prevented, and (4) the fixing accuracy (for example, the fitting accuracy) between the stator core (the end portion on the magnetic attraction stator side) and the yoke can be lowered. .

[Means of claim 3]
The clearance forming member of the linear solenoid according to the means of claim 3 has a cylindrical shape inserted between the radial direction of the magnetic delivery stator and the magnetic delivery yoke.
Thus, since the clearance forming member has a cylindrical shape and is inserted between the magnetic delivery stator and the magnetic delivery yoke in the radial direction, assembly of the clearance forming member is easy and productivity is improved. Excellent.

[Means of claim 4]
The clearance forming member of the linear solenoid in the means of claim 4 is provided integrally with a plunger sliding cylinder which is inserted into the inner peripheral surface of the magnetic delivery stator and supports the plunger slidably in the axial direction.
Since this plunger sliding cylinder facilitates sliding of the plunger in the axial direction, the plunger can be made plating-free. Here, since the clearance forming member and the plunger sliding cylinder are integral, even if the plunger sliding cylinder is provided, an increase in the number of parts can be suppressed and the cost of the linear solenoid can be suppressed.

[Means of claim 5]
The clearance forming member of the linear solenoid and the plunger sliding cylinder in the means of claim 5 are provided integrally with a contact preventing spacer for preventing direct contact between the magnetic attraction stator and the plunger in the axial direction.
Since the contact between the plunger and the magnetic attraction stator is reliably avoided by the contact prevention spacer, it is possible to avoid the problem that the response of the plunger is deteriorated due to the plunger contacting the magnetic attraction stator. Here, since the clearance forming member, the plunger sliding cylinder, and the contact prevention spacer are integrated, an increase in the number of parts can be suppressed even if the contact prevention spacer is provided, and the cost of the linear solenoid can be reduced. .

  The linear solenoid of the present invention is widely applicable as an actuator such as an electromagnetic valve. That is, the present invention includes at least a plunger that is supported so as to be slidable in the axial direction, a magnetic delivery stator that is disposed on the outer periphery of the plunger and delivers a magnetic force in the radial direction from the plunger, and an outer periphery of the magnetic delivery stator. Is applied to a linear solenoid provided with a magnetic delivery stator and a magnetic delivery yoke that delivers magnetic in the radial direction, and is made of a nonmagnetic material between the magnetic delivery stator and the magnetic delivery yoke in the radial direction. A configuration in which a clearance forming member is sandwiched is employed.

The clearance forming member may be inserted between the magnetic delivery stator and the magnetic delivery yoke in the radial direction, or may be attached to the outer peripheral surface of the magnetic delivery stator or the inner peripheral surface of the magnetic delivery yoke. The outer peripheral surface of the magnetic delivery stator or the inner peripheral surface of the magnetic delivery yoke may be coated.
Further, the clearance forming member may be a non-magnetic metal (for example, stainless steel, brass, copper, etc.) processed (for example, press processing), or a non-magnetic resin is used. It may be a thing.
Further, the clearance forming member may be arranged over the entire circumference in the radial direction between the magnetic delivery stator and the magnetic delivery yoke, or may be partially arranged in three or more locations so as not to cause eccentricity in the clearance. You may do it.

Embodiment 1 will be described below with reference to the drawings. In the first embodiment, the “basic configuration of the electromagnetic hydraulic control valve” to which the present invention is applied will be described first, and then “features of the first embodiment” will be described.
[Basic configuration of electromagnetic hydraulic control valve]
The electromagnetic hydraulic control valve is mounted on, for example, a hydraulic control device of an automatic transmission, and includes a spool valve 1 and a linear solenoid 2 that drives the spool valve 1 as shown in FIG. The

(Description of spool valve 1)
The spool valve 1 has a known structure including a sleeve 3, a spool 4, and a return spring (not shown).
The sleeve 3 is inserted into a case of a hydraulic controller (not shown) and has a substantially cylindrical shape.
The sleeve 3 has an insertion hole for slidably supporting the spool 4 in the axial direction, an input port to which hydraulic pressure is supplied from an oil pump (hydraulic pressure generating means) via an oil passage, a switching valve, and the like. Output port for output pressure, discharge port communicating with low pressure side (oil pan etc.), F / B (feedback) port communicating with output port, and breathing communicating with low pressure side (oil pan etc.) A port is formed. In addition, the code | symbol 5 of FIG. 1 is a port for respiration.
The arrangement order of the input port, the output port, the discharge port, and the F / B port in the axial direction is different between the N / C (normally closed) type and the N / O (normally open) type.

The spool 4 is slidably disposed in the sleeve 3 and has an input seal land for sealing the input port, a discharge seal land for sealing the discharge port, and an F / B land having a smaller diameter than the input seal land. A distribution chamber is formed between the input seal land and the discharge seal land, and an F / B chamber is formed between the input seal land and the F / B land.
The arrangement order of the input seal land, the discharge seal land, and the F / B land in the axial direction is different between the N / C type and the N / O type. In addition, the code | symbol 6 of FIG. 1 shows the discharge seal land in the case of N / C type, and shows the F / B land in the case of N / O type.

The right end of the spool 4 in FIG. 1 is in contact with one end of a shaft 7 extending to the inside of the linear solenoid 2, and the other end of the shaft 7 is in contact with an end surface of a plunger 12 to be described later. The spool 4 is provided to be driven in the axial direction via the shaft 7.
The spool valve 1 having the above configuration changes the degree of communication between the input port and the output port and the degree of communication between the output port and the discharge port by displacing the spool 4 in the axial direction by the operation of the linear solenoid 2. The oil pressure generated at the output port changes.

  The return spring is disposed between the spool 4 and the adjusting screw screwed to the end of the sleeve 3 (the side different from the linear solenoid 2), and the spool 4 is connected to the linear solenoid 2 side (right side in FIG. 1). The spring load of the return spring can be adjusted by the screwing amount (screwing amount) of the adjusting screw.

(Description of linear solenoid 2)
The linear solenoid 2 includes a coil 11, a plunger 12, a magnetic stator 13, and a connector 14.
The coil 11 generates a magnetic force when energized to form a magnetic flux loop passing through the plunger 12 and the magnetic stator 13. The coil 11 has a conductive wire (enamel) with an insulating coating around the resin bobbin 11a. Wire).

The plunger 12 is a magnetic metal (for example, a ferromagnetic material such as iron) having a substantially cylindrical shape.
The plunger 12 slides directly on the inner peripheral surface of the magnetic stator 13 (specifically, the inner peripheral surface of a plunger sliding cylinder 26 described later).
Further, as described above, the end surface on the spool 4 side of the plunger 12 is in contact with the tip of the shaft 7, and the plunger 12 together with the spool 4 is urged to the right in FIG. 1 by the urging force of the return spring transmitted to the spool 4. The
Note that a breathing hole 12a penetrating in the axial direction and a recess 12b for adjusting magnetic force are formed inside the plunger 12.

  The magnetic stator 13 includes a magnetic yoke 15 that covers the outer periphery of the coil 11 and a magnetic stator core 16 that is inserted inside the coil 11. A configuration is adopted in which the stator core 16 is inserted from the left side of FIG. 1 and the stator core 16 is fixed together with the sleeve 3 at the cup opening of the yoke 15.

  The stator core 16 is a magnetic metal (for example, a ferromagnetic material such as iron) that allows a magnetic flux passing through the inside of the coil 11 to move from the left side to the right side in FIG. The stator 19 includes a magnetic attraction stator 17, a magnetic resistance portion 18, and a magnetic delivery stator 19.

The magnetic attraction stator 17 includes a flange portion 17a that is magnetically coupled to the opening end of the yoke 15, and an attraction portion 17b that faces the plunger 12 in the axial direction and supports the shaft 7 so as to be slidable in the axial direction. And a magnetic attraction part (main magnetic gap) is formed between the attraction part 17 b and the plunger 12.
Part of the magnetic attraction stator 17 is provided with an attraction recess 17c into which the end of the plunger 12 can enter, and the magnetic attraction stator 17 and part of the plunger 12 are provided so as to intersect in the axial direction. A taper surface is formed on the outer peripheral surface of the suction recess 17c so that the magnetic attraction force does not change with respect to the stroke amount of the plunger 12.

  The magnetoresistive portion 18 is a groove that obstructs the direct flow of magnetic flux between the magnetic attraction stator 17 and the magnetic delivery stator 19, and this groove is provided around the entire circumference between the magnetic attraction stator 17 and the magnetic delivery stator 19. It is formed over.

  The magnetic delivery stator 19 has a cylindrical shape that covers the outer periphery of the plunger 12, and delivers magnetic flux through a yoke 15 (specifically, a magnetic delivery yoke 22 described later) and a clearance forming member 25 described later. In addition, the magnetic flux is transferred through the plunger 12 arranged on the inner periphery and the plunger sliding cylinder 26 described later.

The yoke 15 is a magnetic metal (for example, a ferromagnetic material such as iron) that allows a magnetic flux to pass outside the coil 11, a cylindrical tube yoke 21 that covers the periphery of the coil 11, and a rear end of the tube yoke 21. The cylindrical yoke 21 and the magnetic delivery yoke 22 are integrally provided with a flange-like magnetic delivery yoke 22 extending inward on the side (right side in FIG. 1).
A thin claw is formed in the cup opening of the yoke 15, and after incorporating the components of the linear solenoid 2 (parts in which the stator core 16 and the coil 11 are resin-molded) into the yoke 15, By caulking the claw portion, the component parts of the linear solenoid 2 and the sleeve 3 are firmly coupled.

  Here, a plate end 23 made of resin or metal is attached to the right end (rear end) of the yoke 15 in FIG. The plate end 23 is a part that closes the rear end of the yoke 15 and forms a breathing path that communicates the inside and the outside of the yoke 15. The position of the external communication hole 23 a provided in the plate end 23 is set in the vehicle. After setting according to the vertical direction at the time of mounting, the plate end 23 is fixed to the rear end of the yoke 15 by crimping the thin claws formed on the rear end of the yoke 15. Note that a type without the plate end 23 (for example, see FIG. 3) may be used.

The connector 14 is a connection means for making an electrical connection with an electronic control device (not shown) for controlling the electrohydraulic control valve via a connection line. Inside the connector 14 are terminals 14a connected to both ends of the coil 11, respectively. Is arranged.
The electronic control unit controls the amount of current (current value) supplied to the coil 11 of the linear solenoid 2 by duty ratio control. By controlling the amount of current supplied to the coil 11, the spring load of the return spring is controlled. The output hydraulic pressure of the spool valve 1 is controlled by linearly displacing the axial positions of the plunger 12 and the spool 4 against this.

[Features of Example 1]
The features of the first embodiment will be described separately for "background of the first embodiment" and "technology for solving the problem".
(Background of Example 1)
The linear solenoid 2 according to the first embodiment fixes the yoke 15 and the stator core 16 at the magnetic delivery portion A on the front side (the magnetic attraction stator 17 side) among the magnetic delivery portions of the yoke 15 and the stator core 16, and rearward (the magnetic delivery stator 19 The structure which makes the magnetic delivery part B of the side) non-fixed is employ | adopted. That is, the distal end side (right end side in FIG. 1) of the magnetic delivery stator 19 on the side away from the fixed portion of the stator core 16 is in an unfixed state and is inserted and arranged inside the magnetic delivery yoke 22. When such a configuration is adopted and the present invention is not applied, the following problems occur.

(1) A clearance α for inserting the magnetic delivery stator 19 into the magnetic delivery yoke 22 is required between the magnetic delivery stator 19 and the magnetic delivery yoke 22 in the radial direction.
However, even if the clearance α is provided between the magnetic delivery stator 19 and the magnetic delivery yoke 22 in the radial direction, the magnetic delivery stator 19 and the magnetic delivery yoke 22 come into contact with each other due to variations in parts of the stator core 16 and shaft misalignment during assembly. there is a possibility. When the magnetic delivery stator 19 and the magnetic delivery yoke 22 are in contact with each other in the radial direction, the magnetic flux mainly passes through the contact portion locally, so that an excessive side force is generated in the plunger 12 and the sliding resistance of the plunger 12 is increased. As the response increases, the responsiveness deteriorates significantly and excessive hysteresis occurs.

(2) Between the radial direction of the magnetic delivery stator 19 and the magnetic delivery yoke 22, it is necessary to ensure non-contact over the entire circumference. Therefore, it is necessary to provide a clearance α having a sufficient size to absorb the component variation of the stator core 16 and the shaft deviation at the time of assembly between the magnetic delivery stator 19 and the magnetic delivery yoke 22.
However, increasing the clearance α reduces the magnetic efficiency and sacrifices the magnetic attraction performance of the plunger 12.

(3) Even if the magnetic delivery stator 19 and the magnetic delivery yoke 22 are not in contact with each other over the entire circumference, if the clearance α is decentered due to component variations or shaft misalignment during assembly, a portion with a small clearance α The magnetic flux flows at a portion where the clearance α is large on the opposite side. As a result, a side force biased with respect to the plunger 12 is generated, the sliding resistance of the plunger 12 is increased, the responsiveness is deteriorated, and the hysteresis is increased.
(4) In order to prevent eccentricity of the clearance α as much as possible, the fitting accuracy between the yoke 15 and the stator core 16 in the front magnetic transfer portion A needs to be extremely high, which increases the manufacturing cost. .

(Technology to solve the problem)
In order to solve the above problem, the linear solenoid 2 of the first embodiment includes a nonmagnetic member 24 provided in a substantially cup shape.
The nonmagnetic member 24 is a nonmagnetic component in which a clearance forming member 25, a plunger sliding cylinder 26, and a contact prevention spacer 27 are integrally provided. Specifically, this non-magnetic member 24 is a component in which a non-magnetic metal thin plate such as stainless steel, brass or copper is pressed to integrally form a clearance forming member 25, a plunger sliding cylinder 26 and an abutment prevention spacer 27 at the same time. It is.

The clearance forming member 25 is a member inserted so as to be sandwiched over the entire circumference in the radial direction between the magnetic delivery stator 19 and the magnetic delivery yoke 22 and has a cylindrical shape.
The plate | board thickness of the clearance formation member 25 is about 0.05 mm-0.5 mm, for example, and is provided uniformly over the perimeter.
The inner diameter dimension of the clearance forming member 25 substantially matches the outer diameter dimension of the magnetic delivery stator 19, and the outer diameter dimension of the clearance forming member 25 also substantially matches the inner diameter dimension of the magnetic delivery yoke 22. Note that the distance between the radial direction of the magnetic delivery stator 19 and the clearance forming member 25 and the radial direction between the magnetic delivery yoke 22 and the clearance forming member 25 are set to a very small amount (amount of clearance that can be assembled).

The plunger sliding cylinder 26 is a member that is inserted into the inner peripheral surface of the magnetic delivery stator 19 and supports the plunger 12 so as to be slidable in the axial direction, and has a cylindrical shape.
The plate | board thickness of the plunger sliding cylinder 26 is about 0.05 mm-0.5 mm like the clearance formation member 25, for example, and is provided uniformly over the perimeter.
The outer diameter dimension of the plunger sliding cylinder 26 substantially matches the inner diameter dimension of the magnetic delivery stator 19. On the other hand, the inner diameter dimension of the plunger sliding cylinder 26 is larger than the outer diameter dimension of the plunger 12 by the sliding clearance of the plunger 12. In other words, the outer diameter dimension of the plunger 12 is smaller than the inner diameter dimension of the plunger sliding cylinder 26 by the sliding clearance.

The contact prevention spacer 27 is a member that is disposed between the magnetic attraction stator 17 and the plunger 12 in the axial direction, prevents contact between the magnetic attraction stator 17 and the plunger 12 in the axial direction, and has a ring disk shape.
Specifically, the contact prevention spacer 27 is disposed at the bottom of the suction recess 17 c, and the plate thickness of the contact prevention spacer 27 may be slightly thicker than the clearance forming member 25 and the plunger sliding cylinder 26. For example, it is about 0.1 mm to 1 mm.
A through hole having a size that does not hinder the movement of the shaft 7 is formed at the center of the contact prevention spacer 27.

  Here, the nonmagnetic member 24 may be in an assembly order in which (i) the stator core 16 is inserted into the yoke 15 after being mounted on the stator core 16, or (ii) before the plate end 23 is mounted on the yoke 15. In addition, the stator core 16 to which the nonmagnetic member 24 is not attached is inserted into the yoke 15, and then the nonmagnetic member 24 is assembled from the rear end side of the yoke 15, and the plate end 23 is attached to the yoke 15. good.

(Effect of Example 1)
The linear solenoid 2 according to the first embodiment can obtain the following effects by adopting the above-described “technology for solving the problems”.
(1) Since the clearance forming member 25 made of a non-magnetic material is interposed between the magnetic delivery stator 19 and the magnetic delivery yoke 22 in the radial direction, it is possible to reliably prevent the magnetic delivery stator 19 and the magnetic delivery yoke 22 from contacting each other. Can be avoided. As a result, a malfunction caused by the contact between the magnetic delivery stator 19 and the magnetic delivery yoke 22 (magnetic flux mainly passes through the contact portion, excessive side force is generated in the plunger 12, and the sliding resistance of the plunger 12 increases. In addition, the responsiveness is greatly deteriorated, and excessive hysteresis can be avoided.

(2) Since a clearance forming member 25 made of a non-magnetic material is interposed between the magnetic delivery stator 19 and the magnetic delivery yoke 22 in the radial direction, the clearance α is used for the purpose of absorbing component variations and shaft misalignment during assembly. There is no need to increase the clearance α, and the clearance α can be made smaller than before. As a result, the amount of magnetic flux passing through the clearance α increases, the magnetic efficiency of the magnetic circuit increases, and the magnetic attraction performance of the plunger 12 can be improved. As described above, since the magnetic attraction performance of the plunger 12 is enhanced as compared with the conventional one, the linear solenoid 2 can be downsized, and as a result, the electromagnetic hydraulic control valve can be downsized.

(3) The clearance forming member 25 made of a nonmagnetic material can surely prevent the clearance α from being eccentric. As a result, a malfunction caused by the eccentricity of the clearance α (magnetic flux flows in a biased direction toward the smaller clearance α, a side force is generated in the plunger 12, the sliding resistance of the plunger 12 increases, and the responsiveness deteriorates. , A problem of increasing hysteresis) can be avoided, and the performance of the electromagnetic hydraulic control valve can be improved.

(4) The clearance forming member 25 made of a nonmagnetic material can surely prevent the clearance α from being eccentric. As a result, the fitting accuracy between the yoke 15 and the stator core 16 in the front magnetic delivery section A can be reduced, the manufacturing cost of the linear solenoid 2 can be reduced, and consequently the manufacturing cost of the electromagnetic hydraulic control valve can be reduced. it can.
In addition, since the fitting accuracy between the yoke 15 and the stator core 16 can be lowered, the fitting length can be shortened within a range in which the amount of magnetic transfer can be secured, and the linear solenoid 2 can be miniaturized.

(5) Since the clearance forming member 25 of the first embodiment has a cylindrical shape and is inserted between the magnetic delivery stator 19 and the magnetic delivery yoke 22 in the radial direction, the clearance forming member 25 can be easily assembled. And excellent in productivity.
(6) The plunger sliding cylinder 26 provided integrally with the clearance forming member 25 facilitates sliding of the plunger 12 in the axial direction. Thereby, it becomes possible to make the plunger 12 plating-free, and the manufacturing cost of the linear solenoid 2 can be suppressed.
Here, in the first embodiment, the plunger sliding cylinder 26 is provided. However, since the plunger sliding cylinder 26 is integrated with the clearance forming member 25 and the contact prevention spacer 27, the plunger sliding cylinder 26 is provided with the plunger sliding cylinder 26. Even if provided, the increase in the number of parts can be suppressed, and the manufacturing cost of the linear solenoid 2 can be suppressed.

(7) The contact prevention spacer 27 provided integrally with the clearance forming member 25 and the plunger sliding cylinder 26 reliably prevents the plunger 12 and the magnetic attraction stator 17 from directly contacting in the axial direction. Thereby, deterioration of the responsiveness of the plunger 12 due to the plunger 12 coming into contact with the magnetic attraction stator 17 is avoided.
Here, the contact prevention spacer 27 is provided in the first embodiment, but the contact prevention spacer 27 is integrated with the clearance forming member 25 and the plunger sliding cylinder 26, and therefore the contact prevention spacer 27 is provided. Even if provided, the increase in the number of parts can be suppressed, and the manufacturing cost of the linear solenoid 2 can be suppressed.

[Modification]
In the above embodiment, the clearance forming member 25 is provided in a cylindrical shape and inserted between the magnetic delivery stator 19 and the magnetic delivery yoke 22 in the axial direction. However, the clearance forming member 25 is attached to the outer peripheral surface of the magnetic delivery stator 19. Or may be coated. Alternatively, it may be attached to or coated on the inner peripheral surface of the magnetic delivery yoke 22.

In the above embodiment, the clearance forming member 25 is provided with a nonmagnetic metal. However, the clearance forming member 25 may be provided with a resin material that is nonmagnetic and satisfies the use conditions.
In the above embodiment, the clearance forming member 25 is provided integrally with the plunger sliding cylinder 26 and the contact prevention spacer 27. However, the clearance forming member 25 may be used alone. Specifically, the plunger 12 is provided so as to slide directly on the inner peripheral surface of the magnetic delivery stator 19, the plunger sliding cylinder 26 is eliminated, and the clearance forming member 25 and the contact prevention spacer 27 are provided separately. May be assembled separately.

In the above embodiment, the spool valve 1 is driven by the linear solenoid 2, but the present invention is applied to the linear solenoid 2 that drives a valve device of another valve structure such as a ball valve instead of the spool valve 1. You may do it.
In the above embodiment, a three-way switching valve structure is shown as an example of the valve device, but the structure of the valve device is not limited, and a valve having a two-way valve (open / close valve) or a valve structure more than a four-way valve. You may apply this invention to the linear solenoid 2 which drives an apparatus.

In the above-described embodiment, an example in which the present invention is applied to an electromagnetic hydraulic control valve used in a hydraulic control device for an automatic transmission has been shown. The present invention may be applied to an oil flow control valve such as a VVT whose angle is variable.
In the above embodiment, the present invention is applied to the linear solenoid 2 that drives the valve device (the spool valve 1 in the embodiment). However, the linear solenoid that directly or indirectly drives the driven body other than the valve. The present invention may be applied to 2.

(Example 1) which is sectional drawing of a linear solenoid. (Example 1) which is a principal part expanded sectional view of a linear solenoid. It is sectional drawing of an electrohydraulic control valve (conventional example).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spool valve 2 Linear solenoid 11 Coil 12 Plunger 15 Yoke 16 Stator core 17 Magnetic attraction stator 18 Magnetic resistance part 19 Magnetic delivery stator 22 Magnetic delivery yoke 25 Clearance formation member 26 Plunger sliding cylinder 27 Contact prevention spacer

Claims (5)

A plunger supported slidably in the axial direction;
A magnetic delivery stator disposed on the outer periphery of the plunger, for delivering magnetically in the radial direction with the plunger;
A magnetic delivery yoke disposed on the outer periphery of the magnetic delivery stator, for delivering magnetically in the radial direction with the magnetic delivery stator;
A clearance forming member made of a non-magnetic material sandwiched between radial directions of the magnetic delivery stator and the magnetic delivery yoke;
A linear solenoid comprising: The linear solenoid according to claim 1,
The magnetic delivery stator is a part of a stator core provided integrally via a magnetic attraction stator that magnetically attracts the plunger and a magnetic resistance portion,
The magnetic delivery yoke is a part of a yoke that covers the periphery of a coil that generates a magnetic force when energized,
The linear solenoid is characterized in that the stator core has a structure in which only the end portion on the magnetic attraction stator side is fixed to the yoke, and the magnetic delivery stator side is inserted and arranged on the inner peripheral surface of the magnetic delivery yoke. The linear solenoid according to claim 2,
The linear solenoid, wherein the clearance forming member has a cylindrical shape inserted between radial directions of the magnetic delivery stator and the magnetic delivery yoke. The linear solenoid according to claim 3,
The linear solenoid, wherein the clearance forming member is provided integrally with a plunger sliding cylinder that is inserted into an inner peripheral surface of the magnetic delivery stator and supports the plunger slidably in the axial direction. The linear solenoid according to claim 4,
The magnetic attraction stator is disposed to face the plunger in the axial direction,
The clearance forming member and the plunger sliding cylinder are disposed between the magnetic attraction stator and the plunger in the axial direction, and are provided integrally with a contact prevention spacer for preventing the magnetic attraction stator and the plunger from contacting in the axial direction. A linear solenoid characterized by that.

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