JP2001332419A - Electromagnetic driving device, flow rate controller using it, and method of manufacturing it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic driving device which has a simple constitution and can be manufactured through a small number of manufacturing processes, a flow rate controller using the device, and a method of manufacturing the device. SOLUTION: A stator core 13 has a housing member 14 which houses and supports a plunger 18 in a forwardly and backwardly freely movable state and backward and an attracting member 15 which generates a plunger attracting force to the plunger 18 and the core 13 is integrally formed with the members 14 and 15. An annular recessed section 14a is formed on the outer peripheral wall of the housing member 14 and an annular permanent magnet 17 is put in the section 14a. A bobbin 23 wound with a coil 21 and a stopper 24 which prevents the contact between the plunger 18 and attracting member 15 are integrally molded by using a resin. Since the bobbin 23 and stopper 24 are integrally molded, the number of parts used in the electromagnetic driving device is reduced and, consequently, the number of manufacturing processes and manufacturing cost of the device are reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic drive device in which a locking member for preventing contact between a suction member and a movable element and a winding member for winding a coil are integrally formed of resin, and an electromagnetic drive device using the same. The present invention relates to a flow control device and a method for manufacturing an electromagnetic drive device.

[0002]

2. Description of the Related Art In an electromagnetic drive device that generates a magnetic force between a plunger housed in a housing member and a suction member by energizing a coil and suctions the plunger to the suction member, the plunger contacts the suction member. In order to prevent this, a stopper made of a non-magnetic material is provided on the side of the suction member facing the plunger. A coil wound around a bobbin is provided on the outer periphery of the housing member, and a magnetic attraction force acts between the attraction member and the plunger by energizing the coil.

[0003]

In the conventional electromagnetic drive, the stopper and the bobbin are separate parts. Further, since the bobbin is fitted and assembled on the outer periphery of the housing member, it is necessary to fix the bobbin. Therefore, a washer or the like is provided at one axial end of the bobbin, and the bobbin is pressed against the washer by a yoke or the like from the other axial end to fix the bobbin to prevent vibration of the bobbin. As described above, since the stopper and the bobbin are separate parts, and the bobbin is fitted and assembled on the outer periphery of the housing member, there is a problem that the number of parts increases and the number of manufacturing steps and manufacturing cost increase.

An object of the present invention is to provide an electromagnetic drive device having a simple configuration and a small number of manufacturing steps, a flow control device using the same, and a method of manufacturing the electromagnetic drive device. Another object of the present invention is to provide a small electromagnetic drive, a flow control device using the same, and a method of manufacturing the electromagnetic drive.

[0005]

According to the electromagnetic drive device of the present invention, the winding member for winding the coil and the locking member for preventing the movable element from contacting the suction member are made of resin. It is molded integrally. Therefore, since the number of parts is reduced with a simple configuration, the number of manufacturing steps and the manufacturing cost are reduced.

According to the electromagnetic driving device of the second aspect of the present invention, the accommodating member for accommodating the movable element in a reciprocating manner and the magnetic force for attracting the movable element in one direction of the reciprocating movement are provided between the movable element. The working suction member is integrally formed. Since the accommodating member and the suction member can be cut, for example, continuously, there is no deviation of the axial center between the accommodating member and the suction member. Therefore, the air gap formed by the accommodating member, the suction member and the mover in the radial direction can be minimized. Thereby, the suction force acting between the suction member and the mover increases.

When the housing member and the suction member are integrally formed,
Magnetic flux leaks between the housing member and the suction member, and the suction force acting between the suction member and the mover decreases. Therefore, according to the electromagnetic drive device of the third aspect of the present invention, the permanent magnet is disposed on the outer periphery of the housing member. By arranging a permanent magnet that flows a magnetic flux in the same direction as the magnetic flux flowing to the housing member by energizing the coil, the magnetic flux generated by the permanent magnet becomes a magnetic resistance. Therefore, the magnetic flux flowing between the housing member and the suction member can be reduced.

According to the electromagnetic drive device of the present invention, the housing member has a concave portion on the outer peripheral wall, and a permanent magnet is provided in the concave portion. By forming the concave portion and making the housing member thinner and increasing the magnetic resistance of the thinner portion, the magnetic force of the permanent magnet can be reduced and the permanent magnet can be downsized. Further, since the permanent magnet is arranged in the recess, the diameter of the electromagnetic drive device can be reduced. Further, by realizing the magnetic resistance by combining the thin portion and the permanent magnet, the thin portion can be made thicker. Therefore, even if the electromagnetic driving device is downsized, the mechanical strength of the thin portion can be maintained.

According to the electromagnetic drive device of the fifth aspect of the present invention, the suction member has a notch in the outer peripheral wall or the inner peripheral wall at the end on the side opposite to the housing member. When the resin is injected from the suction member side, the resin flows to the winding member and the locking member side along the notch formed in the suction member. Therefore, the winding member and the locking member can be integrally formed by one injection operation from one injection port.

According to the flow control device of the present invention, since the electromagnetic drive device of any one of the first to fifth aspects is provided, the number of parts is reduced. Therefore, manufacturing man-hours and manufacturing costs are reduced. According to the method of manufacturing an electromagnetic drive device according to claim 7 of the present invention, the resin is molded into the integrally formed housing member and the suction member,
The winding member and the locking member are integrally formed. Therefore, manufacturing man-hours and manufacturing costs are reduced.

According to the method of manufacturing an electromagnetic drive device of the present invention, a recess is formed on the outer periphery of the housing portion before the resin is molded into the integrally formed housing member and the suction member, and the recess is formed permanently. Arrange magnets. The thin portion can be made thicker by realizing the magnetic resistance by combining the thin portion of the accommodating portion with the concave portion and the permanent magnet. Therefore, even if the electromagnetic driving device is downsized, the mechanical strength of the thin portion can be maintained.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 1 shows a flow control device according to an embodiment of the present invention. The flow control device 1 is a spool-type hydraulic control device that controls the hydraulic pressure of hydraulic oil supplied to a hydraulic control device of an automatic transmission such as a vehicle.

A linear solenoid 1 as an electromagnetic drive device
Numeral 0 denotes a bottomed cylindrical yoke 11, a stator core 13, a plunger 18 as a mover, a shaft 19, and a coil 2.
1 etc. The yoke 11 and the stator core 13 constitute a stator. Yoke 11, stator core 13,
The plunger 18 is formed of a magnetic material. Yoke 11
Is caulked with an end of a housing 31 that supports a spool 30 as a movable member in a reciprocating manner,
The stator core 13 and the resin molded body 22 are fixed between the housing 31 and the housing 31.

The stator core 13 has an accommodating member 14 for accommodating and supporting the plunger 18 in a reciprocating manner, and a suction member 15 for generating a force for attracting the plunger 18 between the plunger 18 and is integrally formed. I have. An annular concave portion 14a is formed on the outer peripheral wall of the housing member 14,
An annular permanent magnet 17 is fitted into the recess 14a. The thickness of the thin portion 16 in which the concave portion 14a is formed is:
The thickness is smaller than the thickness of the other housing members 14. As shown in FIG. 2, a cutout 13 a is formed in the outer peripheral wall of the end of the stator core 13 on the suction member side. Notch 13a
Is to form a flow path when resin is injected.
In order to prevent the close contact between the housing member 14 and the plunger 18 shown in FIG. 1, the inner peripheral surface of the housing member 14 or the outer peripheral surface of the plunger 18 is coated or plated with a non-magnetic material.

The permanent magnet 17 is constituted by two 円 arc permanent magnets. The magnetic flux of the permanent magnet 17 flowing through the thin portion 16 located between the permanent magnet 17 and the plunger 18 is the magnetic flux generated by the coil 21 when energizing the coil 21 is turned on (hereinafter referred to as “energizing the coil 21”). The magnetic flux generated by the coil 21 when it is turned on is referred to as a coil magnetic flux) flows in the same direction as the direction toward the thin portion 16. In other words, the permanent magnet 17 is magnetized in a direction opposite to the coil magnetic flux flowing through the housing member 14. And the coil 21
With the power supply to the magnets turned off, the thin portion 16 is
The magnetic flux is magnetically saturated. The thickness of the thin portion 16 is
By adjusting the magnetic force of the permanent magnet 17, the mechanical strength is set so as not to impair the mechanical strength.

The shaft 19 is press-fitted and fixed to the plunger 18, and reciprocates with the plunger 18. One end of the shaft 19 is in contact with one end of the spool 30. The coil section 20 has a coil 21 and a resin molded body 22 that houses the coil 21. Coil section 20
Is sandwiched between the yoke 11 and the housing 31. When a current is supplied to the coil 21 from a terminal (not shown) electrically connected to the coil 21, the yoke 1
A magnetic flux flows through a magnetic circuit constituted by the plunger 18, the plunger 18, and the stator core 13, and a magnetic attraction force is generated between the attraction member 15 of the stator core 13 and the plunger 18. As a result, the plunger 18 and the shaft 19 are
To move down.

The resin molded body 22 includes a bobbin 23 serving as a winding member around which the coil 21 is wound, a stopper 24 serving as a locking member, and a device for fixing the coil 21 and supplying power to the coil 21. And a fixing portion 25 forming a connector which is not provided. The bobbin 23 is formed in a cylindrical shape, and is integrally formed with the stopper 24 and a resin. The stopper 24 prevents the plunger 18 from contacting the suction member 15.

The housing 31 of the spool 30 accommodates and supports the spool 30 in a reciprocating manner. The housing 31 has an input port 32, an output port 33, a feedback port 34, and a discharge port 35 formed therein. The input port 32 is a port into which hydraulic oil supplied by a pump from a tank (not shown) flows. The output port 33 is a port for supplying hydraulic oil to an engagement device of an automatic transmission (not shown). The output port 33 and the feedback port 34 communicate with each other outside the flow control device 1, and a part of the operating oil flowing out of the output port 33 is introduced into the feedback port 34. The feedback chamber 36 communicates with the feedback port 34. The discharge port 35 is a port for discharging hydraulic oil to the tank.

A large-diameter land 37, a large-diameter land 38, and a small-diameter land 39 are formed on the spool 30 in this order from the anti-linear solenoid side. The small-diameter land 39 has a smaller outer diameter than the large-diameter lands 37 and 38. The spool 30 always contacts the shaft 19 of the linear solenoid 10, and the movement of the plunger 18 is transmitted via the shaft 19 to reciprocate in the housing 31. A spring 40 as a biasing means provided on the side opposite to the linear solenoid of the spool 30 biases the spool 30 toward the linear solenoid 10.

The feedback chamber 36 is formed between the large-diameter land 38 and the small-diameter land 39, and the area on which the feedback hydraulic pressure acts differs depending on the outer diameter of the land. Therefore, the hydraulic pressure in the feedback chamber 36 acts to press the spool 30 in the direction opposite to the linear solenoid. The reason why a part of the hydraulic pressure output in the flow control device 1 is fed back is to prevent the output pressure from fluctuating due to the fluctuation of the supplied hydraulic oil pressure, that is, the input pressure. The spool 30 has the urging force of the spring 40, the force of the plunger 18 pushing the spool 30 due to the electromagnetic attraction generated in the stator core 13 by the current supplied to the coil 21, and the force received by the spool 30 from the hydraulic pressure of the feedback chamber 36. Stop at the position where they balance.

The amount of hydraulic oil flowing from the input port 32 to the output port 33 is determined by the seal length, which is the length of the overlap between the inner peripheral wall 31a of the housing 31 and the outer peripheral wall of the large diameter land 38. As the seal length decreases, the amount of hydraulic oil flowing from the input port 32 to the output port 33 increases, and as the seal length increases,
The amount of hydraulic oil flowing to the tank decreases. Similarly, output port 33
The amount of hydraulic oil flowing from the housing to the discharge port 35 depends on the housing 3
It is determined by the seal length between the inner wall 31b and the outer wall of the large-diameter land 37.

When the current is supplied to the coil 21 and the spool 30 moves toward the spring 40, that is, downward in FIG. 1, the seal length between the inner peripheral wall 31a and the large-diameter land 38 becomes longer, and the inner peripheral wall 31b and the large-diameter Since the seal length with the land 37 is reduced, the output port 3
3 decreases, and the flow rate of hydraulic oil flowing from the output port 33 to the discharge port 35 increases. as a result,
The hydraulic pressure of the working oil flowing out of the output port 33 decreases.

On the other hand, when the spool 30 is
When moving in the zero direction, the seal length between the inner peripheral wall 31a and the large-diameter land 38 is shortened, and the seal length between the inner peripheral wall 31b and the large-diameter land 37 is increased. Increases, and the flow rate of hydraulic oil flowing from the output port 33 to the discharge port 35 decreases. As a result, the hydraulic pressure of the working oil flowing out of the output port 33 increases.

The flow control device 1 controls the value of the current supplied to the coil 21 to adjust the force of the linear solenoid 10 to push the spool 30 in the direction opposite to the linear solenoid 10. To adjust. When the value of the current supplied to the coil 21 is increased, the electromagnetic attraction of the stator core 13 increases in proportion to the current value,
The shaft 19 connects the spool 30 to the anti-linear solenoid 10
The pushing force in the direction increases. The force that acts on the spool 30 from the plunger 18 due to the electromagnetic attraction force, the spring 4
The spool 30 stops at a position where the biasing force of 0 and the force of pushing the spool 30 toward the anti-linear solenoid 10 by the pressure of the hydraulic oil fed back are balanced. Therefore, the hydraulic pressure of the working oil flowing out of the output port 33 decreases in proportion to the value of the current supplied to the coil 21.

Next, a manufacturing process of the linear solenoid 10 will be described with reference to FIG. (1) As shown in FIG. 3A, the stator core 13 having the housing member 14 and the suction member 15 is integrally formed by cutting or the like. Recess 1 of stator core 13 integrally molded
The permanent magnet 17 is fitted to 4a.

(2) As shown in FIG. 3B, the bobbin 23 and the stopper 24 are integrally formed by molding a resin. The resin is injected from the end of the stator core 13 on the suction member 15 side. The injected resin flows on the inner peripheral side of the suction member 15 and covers the side of the suction member 15 facing the plunger 18 to form the stopper 24. The injected resin is
The flow bobbin 23 is formed along the notch 13a formed on the outer peripheral wall of the suction member 15.

(3) As shown in FIG. 3C, the bobbin 2
The coil 21 is wound around the outer periphery of the coil 3. (4) As shown in FIG. 3D, the outer periphery of the coil 21 is filled with resin to form the fixing portion 25, and the coil 21 is fixed. Thereby, the coil part 20 is formed. (5) As shown in FIG. 3E, the plunger 18 into which the shaft 19 is press-fitted is inserted into the stator core 13. (6) As shown in FIG. 3F, the assembly of the linear solenoid 10 is completed by covering the yoke 11.

FIG. 4 shows a flow control device according to a comparative example in which the bobbin and the stopper are separate parts from the present embodiment. Components that are substantially the same as those of the present embodiment are denoted by the same reference numerals. Linear solenoid 1 in flow control device 100 of comparative example
The manufacturing process of No. 01 is shown in FIGS. (1) As shown in FIG. 5A, the stator core 10 having the housing member 14 and the suction member 103 is cut or the like.
2 is integrally formed. The permanent magnet 17 is fitted into the concave portion 102a of the integrally formed stator core 102.

(2) As shown in FIG. 5B, a stopper 104 made of a non-magnetic material is provided on the side of the suction member 103 facing the plunger 18. (3) As shown in FIG. 5C, the plunger 18 into which the shaft 19 is pressed is inserted into the stator core 102. (4) As shown in FIG. 5D, a washer 105 is arranged on the outer periphery of the stator core 102 on the suction member side. (5) As shown in FIG. 5E, the coil part 110 is inserted around the outer periphery of the stator core 102. (6) As shown in FIG. 5 (F), the yoke 11 is put on, and the coil portion 110 is pressed against the washer 105, whereby the assembly of the linear solenoid 101 is completed.

FIG. 6 shows a manufacturing process of the coil section 110. (1) As shown in FIG. 6A, the winding part 111 is integrally formed of resin. (2) As shown in FIG. 6B, the coil 112 is wound. (3) As shown in FIG. 6C, a resin is molded on the outer periphery of the coil 112 to fix the coil 112. The housing 31 and the spool 30 are assembled to the electromagnetic drive device 101 thus formed, and the flow control device 10 is mounted.
0 is formed.

In the present embodiment, the bobbin 23
The step of assembling the stopper 24 and the washer is omitted because the and the stopper 24 are integrally formed of resin. Further, since the coil is directly wound around the bobbin 23 in which the stator core 13 is insert-molded, the bobbin 23
Is omitted from the step of fitting the stator core 13 to the stator core 13.

Next, the operation of the flow control device 1 will be described. (1) When the coil is not energized When the energization of the coil 21 is turned off, the spool 30 stops at a position where the urging force of the spring 40 and the force acting by the hydraulic feedback are balanced as shown in FIG. Then, the input port 32 communicates with the output port 33 and the flow rate of the hydraulic oil flowing from the input port 32 to the output port 33 increases, and the discharge port 35 is closed.
The pressure of the hydraulic oil supplied to the automatic transmission becomes maximum.

(2) At the time of energizing the coil The thin portion 16 is magnetically saturated while the energizing of the coil 21 is turned off. Therefore, even if the energizing of the coil 21 is turned on, the coil magnetic flux passes through the thin portion 16. I can't flow.
Therefore, the coil magnetic flux is magnetically saturated in the thin portion 16.
It does not flow, but flows from the housing member 14 toward the plunger 18 and from the plunger 18 toward the suction member 15. Housing member 14
The coil magnetic flux that flows directly through the thin portion 16 to the suction member 15 without passing through the plunger 18 does not act as a force to attract the plunger 18 to the suction member 15. By preventing the coil magnetic flux from flowing directly from the housing member 14 to the suction member 15, the force for attracting the plunger 18 increases.

Next, (a) hydraulic oil discharge control and (b) hydraulic oil output control when the coil is energized will be described. (a) Hydraulic oil discharge control When the current supplied to the coil 21 is maximized, the electromagnetic attraction generated between the plunger 18 and the stator core 13 is maximized, and the plunger 18 is attracted to the stator core 13 to reduce the urging force of the spring 40. It moves together with the counter spool 30. Then, since the input port 32 is closed and the flow rate of the hydraulic oil flowing from the output port 33 to the discharge port 35 increases, the pressure of the hydraulic oil supplied to the automatic transmission becomes 0 (equivalent to the atmospheric pressure).

(B) Hydraulic oil output control When the current supplied to the coil 21 is controlled to be smaller than the state shown in (a), the electromagnetic attraction generated between the plunger 18 and the stator core 13 is small. Become
The plunger 18 and the spool 30 are as described in (1) above.
It is located between (2) and (a). The movement of the spool 30 causes the inner peripheral wall 31 of the housing to move as described above.
a and the large-diameter land 38, and the seal length of the seal formed by the inner peripheral wall 31b and the large-diameter land 37, change the pressure of the hydraulic oil supplied to the automatic transmission. By controlling the current supplied to the coil 21, the position of the spool 30 changes and the pressure of the hydraulic oil supplied to the automatic transmission can be adjusted.

In the embodiment described above, the bobbin 23 and the stopper 24 are integrally formed of resin, so that the number of parts is reduced, and the number of manufacturing steps and manufacturing cost are reduced. Further, by integrally forming the stator core 13 having the housing member 14 and the suction member 15 by cutting or the like, the alignment of the plunger 18 and the housing member 14 becomes easy, and the plunger 18 and the housing member 14 The formed air gap is made as small as possible. On the other hand, in a linear solenoid in which the housing member and the suction member are separately formed, the spool and the stopper can be integrally formed of resin as in the present embodiment. Also in this case, the number of parts is reduced, so that the number of manufacturing steps and the manufacturing cost are reduced.

In this embodiment, the recess 1 of the housing member 14 is used.
4a, a permanent magnet 17 is fitted and a magnetic flux flows in the same direction as the coil magnetic flux to magnetically saturate the thin portion 16. Therefore, even if the thin portion 16 is thick, the housing member 14 and the suction member 1
5 can be prevented from flowing. Since the mechanical strength of the thin portion 16 can be increased, the strength of the stator core 13 can be maintained even if the linear solenoid 10 is downsized. In the above embodiment, the electromagnetic drive of the present invention is used for the electromagnetic drive of the spool type hydraulic control device. Other than this, the electromagnetic drive device of the present invention may be used as a drive device for any flow control device or device as long as the attraction force of the mover is increased without increasing the size.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a flow control device according to an embodiment of the present invention.

FIG. 2A is a cross-sectional view illustrating a stator core of the present embodiment, and FIG. 2B is a cross-sectional view taken along line BB of FIG.
(C) has shown the CC sectional view taken on the line (A).

FIG. 3 is an explanatory view showing a manufacturing process of the present embodiment.

FIG. 4 is a cross-sectional view illustrating a flow control device of a comparative example.

FIG. 5 is an explanatory view showing a manufacturing process of a flow control device of a comparative example.

FIG. 6 is an explanatory view showing a manufacturing process of a coil unit of a comparative example.

[Explanation of symbols]

 Reference Signs List 1 flow rate control device 10 linear solenoid (electromagnetic drive device) 11 yoke 13 stator core 14 housing member 14a recess 15 suction member 16 thin portion 17 permanent magnet 18 plunger (movable element) 20 coil portion 21 coil 22 resin molded body 23 bobbin (winding) 24) Stopper (locking member) 30 Spool (movable member) 40 Spring (biasing means)

Continued on the front page (72) Inventor Atsushi Nakajima 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Inside Denso Corporation (72) Inventor Yoshitaka 1-1-1, Showa-cho, Kariya City, Aichi Prefecture F-term in Denso Corporation (Reference) 3H106 DA08 DA23 DB02 DB12 DB22 DB32 DC09 DD09 EE20 EE34 EE35 GA08 GA25 JJ02 KK03 KK17 5E048 AB01 AC05 AD03 CB01 CB05

Claims (8)

[Claims] A magnetic member that attracts the movable element in one direction of the reciprocating movement acts between the movable element and the movable element; A suction member that forms a magnetic circuit with the housing member; a coil that generates a magnetic force to attract the mover toward the suction member when energized; a winding member that winds the coil; A locking member disposed on the side facing the mover to prevent the mover from contacting the suction member. The winding member and the locking member are integrally formed of resin. An electromagnetic drive device characterized by: 2. The electromagnetic drive device according to claim 1, wherein the housing member and the suction member are integrally formed. 3. The electromagnetic device according to claim 2, wherein a permanent magnet that supplies a magnetic flux in the same direction as the magnetic flux flowing through the housing member by energizing the coil is disposed on an outer periphery of the housing member. Drive. 4. The electromagnetic drive device according to claim 3, wherein the housing member has a concave portion on an outer peripheral wall, and the permanent magnet is disposed in the concave portion. 5. The electromagnetic drive device according to claim 2, wherein the suction member has a notch in an outer peripheral side wall or an inner peripheral side wall at an end on the side opposite to the housing member. 6. A housing having a plurality of fluid flow paths penetrating a cylindrical peripheral wall, the electromagnetic drive device according to any one of claims 1 to 5, and the fluid by reciprocating with the movable element. A flow rate control, comprising: a movable member that controls a flow rate of a fluid flowing through the flow path; and a biasing unit that biases the movable member in a direction opposite to a direction in which the movable element is sucked by the suction member. apparatus. 7. A movable element, a housing member for accommodating the movable element in a reciprocating manner, and a magnetic force for attracting the movable element in one direction of the reciprocating movement acts between the movable element and the movable element. A suction member that forms a magnetic circuit with the housing member; a coil that generates a magnetic force to attract the mover toward the suction member when energized; a winding member that winds the coil; A method of manufacturing an electromagnetic drive device, comprising: a lock member disposed on a side facing the mover to prevent the mover from contacting the suction member. Molding the resin into the integrally formed housing member and the suction member, and integrally molding the winding member and the locking member, and winding the coil around the winding member. Turning step, Method of manufacturing an electromagnetic driving device characterized by having the steps of inserting the movable element serial housing member. 8. A method according to claim 1, wherein a concave portion is formed on an outer periphery of said housing member and a permanent magnet is provided in said concave portion before resin is molded into said housing member and said suction member which are integrally formed. Item 8. The method for manufacturing an electromagnetic drive device according to Item 7.