JP3509656B2 - Electromagnetic coil device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil assembly including a bobbin made of a synthetic resin and a coil wound around the bobbin, and a synthetic resin having a coupler portion integrally and covering the coil assembly. An electromagnetic coil device including a housing, an electric circuit housed in the housing, and a bus bar having one end arranged in the coupler portion and the other end connected to the electric circuit and insert-coupled to the housing. Regarding the torque detector.

[0002]

2. Description of the Related Art Conventionally, in such an electromagnetic coil device, an electric circuit is often arranged outside a housing, and it cannot be said that the structure is compact. Therefore, it may be considered that the electric circuit is housed in the housing.
In that case, it is necessary to insert a plurality of bus bars connecting the coupler portion formed in the housing and the electric circuit into the housing while holding the bus bars in accurate positions during molding of the housing.

The present invention has been made in view of the above circumstances, and provides an electromagnetic coil device in which a plurality of bus bars can be insert-coupled to a housing by preventing positional deviation during molding of the housing. The purpose is to do.

[0004]

In order to achieve the above object, the invention according to claim 1 is such that a coupler is integrated with a coil assembly including a bobbin made of synthetic resin and a coil wound around the bobbin. A housing made of synthetic resin for covering the coil assembly, an electric circuit housed in the housing, and one end arranged in the coupler part and the other end connected to the electric circuit to connect to the housing. In an electromagnetic coil device including a plurality of insert-coupled busbars, the plurality of busbars including a busbar provided with a caulking portion capable of caulkingly engaging the bobbin, and a part of the busbars are covered and the coil assembly is also provided. A busbar assembly is constituted by a synthetic resin covering portion formed in a shape capable of abutting the outer periphery of the solid body, and the coil assembly and the covering portion are connected to each other. And a bus bar assembly which is brought into contact to the outer periphery of yl assembly is temporarily fixed to the coil assembly by crimping engaging the crimping section to the bobbin is characterized in that covered by the housing.

According to this structure, the busbar assembly is temporarily fixed to the coil assembly when the housing is molded, so that the busbar is displaced due to the pressure of the molten resin when the housing is molded. The plurality of bus bars can be accurately positioned and insert-coupled to the housing.

The invention according to claim 2 is the above-mentioned claim 1.
In addition to the configuration of the invention described above, in the coating portion of the bus bar assembly, the flow of the molten resin is avoided by avoiding the flow of the molten resin between the bus bar assembly and the coil assembly during molding of the housing. Is formed on the outer peripheral side of the busbar assembly. According to this configuration, the pressure of the molten resin acts on the busbar assembly in a direction to separate the busbar assembly from the coil assembly. It becomes possible to prevent the displacement of the bus bar assembly from occurring more reliably, and at the same time,
It is possible to prevent the bus bar assembly from being deformed due to the pressure of the molten resin.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below based on an embodiment of the present invention shown in the accompanying drawings.

1 to 13 show an embodiment in which the present invention is applied to a torque detector. FIG. 1 is a vertical sectional view of the torque detector, and FIG. 2 is a relation between an input shaft and a movable member. 3 is a cross-sectional view taken along line 3-3 of FIG. 2, FIG. 4 is an exploded perspective view of a coil assembly and a bus bar assembly,
5 is an exploded plan view of the coil assembly and the bus bar assembly, FIG. 6 is a plan view of the coil assembly and the bus bar assembly in a temporarily fixed state, and FIG. 7 is a sectional view taken along line 7-7 of FIG.
7 is a cross-sectional view showing the molding state of the housing corresponding to FIG. 7, FIG. 9 is a plan view of the housing, FIG. 10 is a view taken in the direction of arrow 10 of FIG. 9, FIG. 11 is a view taken in the direction of arrow 11 of FIG. 9, and FIG. 11 is a cross-sectional view showing the bending process of the circuit connecting terminal along line 12-12 in FIG. 11, and FIG. 13 is a cross-sectional view taken along line 13-13 of FIG.
It is a line sectional view.

First, in FIG. 1, the torque detector is
For example, an input shaft 11 connected to a steering handle side (not shown), an output shaft 12 connected to a wheel side (not shown) and arranged coaxially with the input shaft 11, which are provided in a power steering system of a vehicle, and an input shaft. 11 and an output shaft 12 are connected to each other, and the torsion bar 13 is provided in accordance with the torque input to the input shaft 11.
Input shaft 11 and output shaft 1 due to torsional deformation of
The amount of relative angular displacement generated between the two is detected as a value according to the input torque.

The housing 14 of the torque detector includes a bobbin 15 and first and second bobbins 15 wound around the bobbin 15.
The input shaft 11 is made of synthetic resin and formed into a tubular shape so as to cover the coil assembly 18 including the coils 16 and 17.
It is rotatably supported by a ball bearing 19 fixed to the bobbin 15 at one axial end thereof and is inserted into the housing 14. Moreover, ball bearings 19
The housing 14 and the input shaft 11 on the axially outer side than
A dust seal 20 is provided between them.

The torsion bar 13 is inserted into the input shaft 11, and one ends of the input shaft 11 and the torsion bar 13 are connected to each other by a connecting pin 21. As a result, one end of the torsion bar 13 rotates together with the input shaft 11, while the other end of the torsion bar 13 and the other end of the input shaft 11 can be displaced relative to each other in accordance with the torsional deformation of the torsion bar 13.

A metal support 22 is fastened to the other end of the housing 14, and the support 22 is fixedly supported by the vehicle body 23 of the vehicle and is fastened to the housing 14 and An annular seal member 24 for preventing water and dust from entering the support 22 is interposed between the support 22 and the vehicle body 23.

The output shaft 12 is rotatably supported by a support 22 via a ball bearing 25, and the other end of the torsion bar 13 is connected to one end of the output shaft 12 via a serration 26. .

A movable member 27 made of synthetic resin is arranged between the bobbin 15 of the coil assembly 18 integrated with the housing 14 and the other end of the input shaft 11, and the movable member 27 is provided on the outer surface of the movable member 27. The ring-shaped core 28 is fixed.

By the way, a pair of restriction pins 29, 29 projecting outward from the outer surface of the output shaft 12 along one diameter line thereof are attached to one end of the output shaft 12, and these restriction pins 29 are mounted. , A restriction groove 30 for engaging the tip of 29,
30 extends in the axial direction of the output shaft 12 and is provided on the inner surface of the movable member 27. Therefore, the movable member 2
The 7 and the core 28 cannot rotate relative to the output shaft 12, but can move in the axial direction relative to the output shaft 12 within a range in which the restriction pins 29, 29 are guided by the restriction grooves 30, 30. Moreover, the coil spring 32 is provided between the retainer 31 received by the inner ring of the ball bearing 25 provided between the output shaft 12 and the support 22 and the movable member 27. The movable member 27, that is, the core 28 is urged by the spring force in a direction away from the output shaft 12.

2 and 3, a spiral guide groove 33 is provided on the inner surface of the movable member 27, and a pin 34 fitted in the guide groove 33 is mounted on the input shaft 11. Therefore, when a relative angular displacement occurs between the input shaft 11 and the output shaft 12 due to the torsional deformation of the torsion bar 13 in response to the torque input to the input shaft 11, the movable member 27 and the core are moved according to the relative angular displacement amount. 28 is the input shaft 11
The position along the axis of will be changed.

Referring also to FIGS. 4 and 5, the bobbin 15 includes a coil winding portion 15a having a substantially cylindrical shape, and a substantially cylindrical extension tube portion 1 coaxially connected to one end of the coil winding portion 15a.
5b, and is formed into a generally stepped cylindrical shape as a whole. Regulations for restricting the winding range of the first and second coils 16 and 17 wound on the outer surface of the coil winding portion 15a on the outer surfaces of the one end side, the intermediate portion and the other end side of the coil winding portion 15a. The walls 15c, 15d, 15e are integrally provided so as to project outward in the radial direction. A plurality of protrusions 15f, 15f for strengthening the coupling between the bobbin 15 and the housing 14 are provided on the outer surface of the coil winding portion 15a on the one end side.
Are radially protruded so that the outer ends thereof are flush with the outer ends of the restriction wall portions 15c, and the bobbin 15 and the housing 14 are reinforced on the outer surface of the coil winding portion 15a on the other end side. The plurality of protrusions 15g, 15g, ...
The projections are radially provided so as to project outward from 5e.

A ball bearing 19 provided between the input shaft 11 and the housing 14 is provided at a tip portion of the extension cylinder portion 15b of the bobbin 15 so that an axial outer end thereof slightly projects from the tip of the extension cylinder portion 15b. The flange portion 15h for receiving the inner end of the outer ring of the ball bearing 19 is integrally provided on the extension cylinder portion 15b so as to project radially inward from the inner surface of the extension cylinder portion 15b. To be

The coil assembly 18 includes the bobbin 15 and
First and second coils 16 wound around the bobbin 15,
17 and three bus bars 37 made of conductive metal, which are mounted on the outer surface of the bobbin 15 on one end side of the coil winding portion 15a.
38 and 39 are included.

On one end side of the bus bars 37, 38, the extension cylinder portion 15b is located outside the extension cylinder portion 15b of the bobbin 15.
Connecting terminals 37a, 38a for coils extending to one end side of the bus bar 37, 38 are formed on the other end side of the bus bars 37, 38, respectively, and a pair of bifurcated circuit connecting terminals 37b, 37 are formed.
b; 38b and 38b are respectively formed so as to project outward from the outer surface on the one end side of the coil winding portion 15a along the radial direction of the bobbin 15. Also bus bar 39
Is mounted on the bobbin 15 between the bus bars 37 and 38, and a pair of bifurcated coil connecting terminals 39a and 39a are provided on one end side of the bus bar 39 and the extension cylinder portion 15b. Is formed so as to extend to the one end side of the extension tubular portion 15b outside the coil winding portion 1 and the other end side of the bus bar 39 along the radial direction of the bobbin 15.
Circuit connecting terminal 3 protruding outward from the outer surface of one end of 5a
9b is formed.

With the bus bars 37 to 39 mounted on the bobbin 15, the coil connection terminals 37 of the bus bars 37 and 38 are provided.
A ends of the first and second coils 16 and 17 are connected to a and 38a by fusing or the like, and the bus bar 39
The other ends of the first and second coils 16 and 17 are connected to the coil connection terminals 39a and 39a by fusing or the like, respectively.

At the time of molding the housing 14, the coil assembly 18, the ball bearing 19 fitted to the bobbin 15 of the coil assembly 18, and the coil assembly 18 are temporarily fixed to the coil assembly 18 as shown in FIG. The busbar assembly 40 is inserted into the molding die, and the busbar assembly 40 is also covered with the housing 14.

The bus bar assembly 40 is formed by covering a part of a plurality of, for example, seven bus bars 41 to 47 made of a conductive metal with a covering portion 48 made of a synthetic resin.

At one end of each of the bus bars 41 to 47, the bus bar assembly 40 is temporarily fixed to the coil assembly 18 and externally protrudes from the covering portion 48 in a direction parallel to the radial direction of the coil assembly 18. Conductor connection terminals 41a to 47a are formed respectively, and the other end of each bus bar 41 to 47 is parallel to the radial direction of the coil assembly 18 with the bus bar assembly 40 temporarily attached to the coil assembly 18. Connection terminal 4 for coil protruding outward from the covering portion 48 in any direction
1b to 47b are formed respectively.

The coil connection terminals 41b-47b are arranged so that the coil connection terminals 37b ..., 38b ..., 39b of the bus bars 37-39 mounted on the bobbin 15 are arranged in a plane orthogonal to the axis of the bobbin 15. On the other hand, those coil connection terminals 37b ..., 38b.
The bobbin 15 so as to intersect the arrangement of 9b in a substantially L shape.
Are arranged so as to line up in the axial direction. The external conductor connection terminals 41a to 47a correspond to the coil connection terminals 37, respectively.
, 38b ..., 39b, 41b to 47b are arranged at positions displaced in the circumferential direction of the bobbin 15,
It is arranged so as to be lined up in a plane orthogonal to the axis of 5.

The covering portion 48 is formed in a substantially arcuate shape so that the inner circumference can be brought into contact with the outer circumferences of the regulating wall portions 15c to 15e in the coil assembly 18, and the covering portion 48 covers the regulating wall portions 15c to 15c. The caulking portions 49, 5 which can be caulkedly engaged with the bobbin 15 of the coil assembly 18 in a state of being brought into contact with the caulking member 15e.
0 is integrally formed with the bus bar 41 among the bus bars 41 to 47, and a crimp portion 51 that can be caulked with the bobbin 15 of the coil assembly 18 is integrally formed with the bus bar 47 among the bus bars 41 to 47. To be done.

On the other hand, on the outer surface of the bobbin 15 of the coil assembly 18 on one end side of the coil winding portion 15a, an engaging hole 52 for crimping and engaging the crimp portion 50 is provided on one end side of the coil winding portion 15a. An engaging portion 53 formed between the outer surface and the outer surface is integrally projected, and the outer surface of the bobbin 15 of the coil assembly 18 on the other end side of the coil winding portion 15a is caulked with the caulking portions 49 and 51. Engaging holes 54, 56 for
Locking portions 55 and 57 which are formed between the coil winding portion 15a and the outer surface of the other end side of the coil winding portion 15a are integrally projected.

Therefore, with the inner circumference of the covering portion 48 abutting against the outer circumferences of the restricting wall portions 15c and 15e of the coil assembly 18, the caulking portions 49 to 51 are engaged with the engaging portions 53, 55 and 57 of the bobbin 15. By caulking and engaging with each other, the bus bar assembly 40 is temporarily fixed to the coil assembly 18, as shown in FIG.

Referring also to FIG. 7, the bus bar assembly 4
The covering portion 48 of 0 has bobbin 15 on both sides of the crimping portion 50.
The flow control parts 48a and 48b for contacting the tip ends with the outer surface of the extension cylinder part 15b are integrally provided so as to continuously connect the base end part to the outer periphery of the covering part 48. 48b prevents the flow of the molten resin in the molding die from flowing between the bus bar assembly 40 and the coil assembly 18 at the time of molding the housing 14 that covers the coil assembly 18 and the bus bar assembly 40. It has the function of guiding the resin flow to the outer peripheral side of the bus bar assembly 40.

That is, as shown in FIG. 8, a coil assembly 18, a ball bearing 19 and a bus bar assembly 40.
Is inserted into the molding die 58, and a cavity 59 formed between the coil assembly 18, the ball bearing 19 and the bus bar assembly 40 and the molding die 58 is indicated by an arrow from the gate 60 which is one end side of the bobbin 15. When the molten resin is press-fitted as described above, by the flow control units 48a and 48b,
The molten resin is guided to the outer peripheral side of the bus bar assembly 40.

9 to 11, in the housing 14 molded by the molding die 58, flange portions 14a for fastening the housing 14 to the support 22 are provided at equal intervals in the circumferential direction of the housing 14. The bolts 62 ... (See FIG. 1) screwed to the support 22 can be inserted into the flange portion 14a at the three opened positions so as to project outward. The cylindrical metal sleeves 61 ... Are insert-coupled.

Further, the housing 14 is integrally formed with a male coupler portion 14b which is formed in a tubular shape having a rectangular cross section and protrudes outward, and the housing 14 includes a bus bar assembly 40.
The external conductive wire connection terminals 41a to 47a at one end of the bus bars 41 to 47, which are to be insert-coupled to the housing 14 by being covered with, are arranged so as to face the inside of the coupler portion 14b.

Further, a cylindrical portion 14c having a substantially rectangular cross section is integrally formed on the housing 14 so as to project outward in the radial direction of the housing 14, and constitutes an inner surface of the cylindrical portion 14c. Thus, the housing recess 63 provided in the housing 14 is provided in the housing 14.
A flange 65 is integrally provided on the outer end of the cylindrical portion 14c, and a synthetic resin cover 64 for closing the housing recess 63 is formed.
(See FIG. 1) is welded to the flange 65.

As shown in FIG. 1, the accommodation recess 63 accommodates an electric circuit 67 in which electric components such as an amplifier are mounted on a circuit board 66, and the circuit board 66 is attached to the housing 1.
It is attached to 4. The electric circuit 67 is configured to obtain a signal corresponding to the input torque according to the inductance change of the first and second coils 16 and 17. That is, the torsional deformation of the torsion bar 13 according to the torque input to the input shaft 11 causes the core 28 to move to the input shaft 11
Positions along the axis of the first and second coils 16,
The relative position with respect to the coil 17 is changed, and such a relative position change causes a magnetic change around the coils 16 and 17, so that the inductances of the coils 16 and 17 are changed. A signal corresponding to the input torque is obtained by the electric circuit 67 according to the change in the inductance.

In order to mount the circuit board 66, the circuit board 66 is provided at the bottom of the housing recess 63 in the housing 14.
A plurality of annular receiving surfaces 68 for receiving and a projection 69 projecting from the receiving surface 68 are provided at the tip end, for example, 3
The individual bosses 70, 70 ... Are integrally provided to project, and the projection 6
The circuit board 66 is fixed to the housing 14 by caulking and engaging the projecting portions of the projecting portions 69 with the circuit board 66 received by the receiving surfaces 68. .

By the way, when the busbar assembly 40 is covered with the housing 14, the circuit connecting terminals 41b to 47b at the other ends of the busbars 41 to 47 to be insert-coupled to the housing 14 and the coil assembly 18 are formed. The circuit connection terminals 37b ..., 38b ..., 39b formed by a part of the bus bars 37 to 39 which are covered with the housing 14 and insert-coupled to the housing 14.
Are projected from the housing 14 so as to be arranged in the accommodation recess 63, and these circuit connection terminals 37b ...
38b ..., 39b, and 41b to 47b are connected to the circuit board 66 by soldering or the like with their tips inserted into the circuit board 66.

Moreover, the connection terminals 37b, ...
, 39b, 41b to 47b are connected to each circuit connection terminal 3 by the expansion and contraction action by heat in the connection state to the circuit board 66.
, 38b ..., 39b, 41b to 47b, in order to prevent the connection portions of the circuit board 66 from coming off, they are pre-bent before the circuit board 66 is attached to the housing 14, and are accommodated in the receiving recesses. In the housing 63, the connection terminals 37b ..., 38b ...
Terminal bending pedestals 71 and 7 individually corresponding to 1b to 47b
1 are formed when the housing 14 is molded.

In FIG. 12, each terminal bending base 71,
71 ... are circuit connection terminals 37b ..., 38b ..., 39
b, 41b to 47b so as to be adjacent to the outer side thereof, and circuit connection terminals 37b ..., 38b.
, 39b, 41b to 47b are pressed, and circuit connecting terminals 37b ..., 38b ..., 39b, 41b to 4 are connected.
7b is formed in a shape that can be bent into a substantially L shape.

Further, the connection terminals for each circuit 37b are bent at the portions bent by being pressed against the terminal bending pedestals 71, 71 ...
..., 38b ..., 39b, on both side surfaces of 41b to 47b,
The notches 72, 72 ... Are preformed.

Connection terminals 37b ... 38b ... 3 for each circuit
9b and 41b to 47b, when the molding of the housing 14 is completed, as shown in FIG. 12 (a), they extend in a straight line and project from the housing 14. Connection terminals 37b ..., 38b
, 39b, 41b to 47b are bent, as shown in FIG.
A bending jig 73 as shown in (b) is used. The bending jig 73 includes connection terminals 37b, ...
8b ..., 39b, 41b to 47b may be bent one by one, but in order to improve the working efficiency,
Circuit connection terminals 37b ..., 38b ..., 39 arranged in a line
It is desirable that each of b and the circuit connection terminals 41b to 47b arranged in a line can be bent once. Therefore, the bending jig 73 is formed so as to form a plurality of grooves 74 ... Corresponding to the respective circuit connecting terminals 37b ... 38b ... 39b; 41b-47b, and the bottoms of these grooves 74. And the pressing portion 75 formed in a triangular shape ...
And are formed at the tip. Thus, the pressing portion 7
5, ... Connection terminals 37b ..., 38b ..., 39b for each circuit;
41b to 47b, and by pressing them against the terminal bending pedestals 71 ... As shown in FIG. 12 (c), the respective circuit connecting terminals 37b ... 38b ... 39b; 41b-47.
B is bent so as to be bent at a substantially right angle at the notches 72, 72 ...

In this way, each circuit connection terminal 37b
, 38b ..., 39b; 41b to 47b are bent, then the circuit board 66 is attached to the housing 14, and thereafter, the respective circuit connection terminals 37b ..., 38 to the circuit board 66.
The connection of b ..., 39b; 41b-47b is executed.

In FIG. 13, the coupler portion 14b provided in the housing 14 is provided with a female portion connected to the external lead wires 78, 78, ... Corresponding to the external lead wire connection terminals 41a to 47a respectively arranged in the coupler portion 14b. Type coupler 77 is detachably mounted, and the coupler 77 has a tubular portion 77a fitted around the outer periphery of the coupler portion 14b and an insertion portion 77b inserted into the coupler portion 14b. Are made of synthetic resin.

The insertion portion 77b has insertion holes 79, 79 into which the external conductor connecting terminals 41a-47a are individually inserted.
Are provided, and the external conductive wires 78, 78 ... Can be individually connected to the inner ends of the insertion holes 79, 79, and the external conductive wire connection terminals 41a to 47a can be removably fitted. The terminals 79, 79 ... Are fixed.

Moreover, an endless seal is provided on the outer circumference of the insertion portion 77b of the coupler 77 so as to keep the watertightness inside the coupler portion 14b by closely contacting the outer circumference of the coupler portion 14b when the coupler 77 is mounted on the coupler portion 14b. The member 81 is attached.

By the way, an electric circuit 67 into the accommodation recess 63
It is necessary to check the waterproofness of the housing recess 63 that is closed by the cover 64 welded to the flange 65 after the housing of the coupler 65. For the waterproofness check, air pressure is applied from the coupler portion 14b to the housing recess 63. The communication hole 82 that can be pressed is provided in the coupler portion 14b and the accommodation recess 6
3 is connected and provided in the housing 14.

Next, the operation of this embodiment will be described. An electric circuit housed in the housing 14 has external connection terminals 41a to 47a for external wires facing the coupler portion 14b provided in the housing 14 at one end side. 6
When inserting the bus bars 41 to 47 having the circuit connection terminals 41b to 47b connected to 7 on the other end side into the housing 14, caulking portions 49, 50 and 51 which can be caulkingly engaged with the bobbin 15 are provided. Bus bar 4
The busbar assembly 40 includes a plurality of busbars 41 to 47 including 1, 47 and a synthetic resin coating portion 48 that covers a part of the busbars 41 to 47. The crimp portions 49 to 51 are tentatively fixed to the coil assembly 18 by crimping and engaging the bobbin 15 in a state of being in contact with the three-dimensional body 18. For this reason,
It is possible to prevent the displacement of the bus bars 41 to 47 due to the pressure of the molten resin at the time of molding the housing 14, and to accurately position the plurality of bus bars 41 to 47 and insert them into the housing 14. .

In addition, the covering portion 48 of the bus bar assembly 40 is prevented from flowing into the space between the bus bar assembly 40 and the coil assembly 18 during the molding of the housing 14 to prevent the flow of the molten resin. Since the flow control portions 48a and 48b that lead to the outer peripheral side of the busbar assembly 40 are formed, the busbar assembly 4 is formed in the direction in which the pressure of the molten resin separates the busbar assembly 40 from the coil assembly 18.
It is possible to avoid acting on 0, it is possible to more reliably prevent the displacement of the busbar assembly 40 from occurring, and the deformation of the busbar assembly 40 due to the pressure of the molten resin occurs. Can be prevented.

Further, the circuit connecting terminal 3 formed by a part of the bus bars 37, 38, 39, 41 to 47 which is insert-coupled to the housing 14 and protruding from the housing 14.
, 38b ..., 39b, 41b to 47b are connected to the circuit board 66 attached to the housing 14 by soldering or the like, and the respective circuit connection terminals 37b ..., 38b ..., 39b, 41b due to heat. ... 47b by the expansion and contraction action of each circuit connection terminal 37b ..., 38b ...,
In order to prevent the connection portions of 39b, 41b to 47b to the circuit board from coming off, circuit connection terminals 37b ...
38b ..., 39b, 41b to 47b need to be bent in advance, but in the housing 14, terminal bending pedestals 71, 71 adjacent to the circuit connecting terminals 37b ..., 38b ..., 39b, 41b to 47b. Are formed at the time of molding. Therefore, the circuit connection terminals 37b ..., 38b
..., 39b, 41b to 47b, terminal pedestal 71,
It can be bent just by pressing on 71 ...
Since the bending jig 73 for pressing may have a simple shape, the circuit connecting terminals 37b ..., 38b ..., 39b, 41b to 47b can be easily bent with the simple bending jig 73. be able to.

Circuit connection terminals 37b ..., 38b ...,
39b, 41b-47b, the terminal bending pedestal 7
Notches 7 are provided in the parts that are bent by pressing on 1, 71 ...
2, 72 ... Are preformed, and the circuit connection terminals 37 are provided.
b ..., 38b ..., 39b, 41b-47b can be bent more easily.

Further, after the electric circuit 67 is housed in the housing recess 63 provided in the housing 14, the housing recess 63 is closed by the cover 64. In order to check the property, a communication hole 82 that allows air pressure to act from the inside of the coupler portion 14b into the housing recess 63 connects the inside of the coupler portion 14b and the housing recess 63 to the housing 1
4 is provided, and the coupler unit 14b has a coupler 77.
Can be attached and removed in a watertight manner. Therefore, after the waterproof check is completed, the coupler 77 is connected to the coupler 14b.
It becomes unnecessary to close the communication hole 82 by mounting the, and it is possible to reduce the number of parts by eliminating the member for closing the communication hole 82, and the work for closing the communication hole 82 is also unnecessary. It can be reduced.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the claims. It is possible to do.

For example, in the above embodiment, the case where the present invention is applied to the torque detector has been described, but the present invention is
A coil assembly including a bobbin and a coil, a housing made of synthetic resin that integrally has a coupler portion and covers the coil assembly, an electric circuit housed in the housing, and one end disposed in the coupler portion and electrical connection. The present invention is widely applicable to a circuit including a plurality of bus bars which are connected at the other end to the circuit and are insert-coupled to the housing.

[0053]

As described above, according to the first aspect of the present invention, the busbar assembly is temporarily fixed to the coil assembly during the molding of the housing, so that the pressure of the molten resin during the molding of the housing is increased. It is possible to prevent the displacement of the bus bar due to the above, and it is possible to accurately position the plurality of bus bars and insert-connect them to the housing.

According to the second aspect of the present invention, the position of the busbar assembly is prevented while avoiding that the pressure of the molten resin acts on the busbar assembly in the direction of separating the busbar assembly from the coil assembly. It is possible to more reliably prevent the occurrence of the above, and it is possible to prevent the deformation of the bus bar assembly due to the pressure of the molten resin.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a torque detector.

FIG. 2 is a cross-sectional view showing an engaged state of an input shaft and a movable member.

FIG. 3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is an exploded perspective view of a coil assembly and a bus bar assembly.

FIG. 5 is an exploded plan view of a coil assembly and a bus bar assembly.

FIG. 6 is a plan view of a coil assembly and a bus bar assembly in a temporarily fixed state.

7 is a sectional view taken along line 7-7 of FIG.

FIG. 8 is a cross-sectional view showing a molding state of the housing corresponding to FIG.

FIG. 9 is a plan view of the housing.

10 is a view on arrow 10 of FIG. 9. FIG.

FIG. 11 is a view taken in the direction of arrow 11 in FIG.

FIG. 12 shows the bending process of the circuit connecting terminal in FIG.
It is sectional drawing shown along the 12 line.

13 is a sectional view taken along the line 13-13 of FIG. 11 in a cover welded state.

[Explanation of symbols]

14 ... Housing 14b: coupler section 15 ... Bobbin 16, 17 ... Coil 18 ... Coil assembly 67 ... electric circuit 40 ... Bus bar assembly 41-47 ... Bus bar 48 ... Covering part 48a, 48b ... Flow control unit 49, 50, 51 ... Caulking part

─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP 10-267769 (JP, A) JP 10-256035 (JP, A) JP 10-326717 (JP, A) JP 8- 97031 (JP, A) Actual Kaihei 3-54347 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01L 3/10 303 H01F 5/04

Claims (2)

(57) [Claims] 1. A bobbin (15) made of synthetic resin and coils (16, 17) wound around the bobbin (15).
A coil assembly (18) including a coupler section (14b)
A housing (14) made of synthetic resin for integrally covering the coil assembly (18), an electric circuit (67) housed in the housing (14), and the coupler section (14).
b) with one end located inside and said electrical circuit (67)
In the electromagnetic coil device including a plurality of bus bars (41 to 47) that are connected at the other end to the housing (14) and insert-coupled to the housing (14), a caulking portion (49, 50) capable of caulkingly engaging with the bobbin (15). , 51) provided with the plurality of bus bars (41, 47).
To 47) and a part of the bus bars (41 to 47), and a synthetic resin covering portion (48) formed in a shape capable of contacting the outer periphery of the coil assembly (18).
And a bus bar assembly (40) is formed of the coil assembly (18) and the covering portion (48) in contact with the outer periphery of the coil assembly (18), and the caulking portion (4).
9 to 51) is caulkedly engaged with the bobbin (15), and the bus bar assembly (40) temporarily fixed to the coil assembly (18) is covered with the housing (14). Electromagnetic coil device. 2. A flow of molten resin flows into the covering portion (48) of the busbar assembly (40) between the busbar assembly (40) and the coil assembly (18) during molding of the housing (14). The electromagnetic coil device according to claim 1, wherein flow control portions (48a, 48b) for guiding the flow of the molten resin to the outer peripheral side of the bus bar assembly (40) while avoiding the above are formed.