JPH0746031Y2 - Torque detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a torque detection device used in an electric power steering mechanism of an automobile.

[Conventional technology]

In the conventional torque detecting device of this type, for example, the magnetic coupling changes according to the twist of the torsion bar connecting the input shaft connected to the steered wheels and the output shaft connected to the steering portion. A magnetic coupling portion is provided, and the torque that induces a voltage in the sensor coil provided inside the detector body is detected according to the change in the magnetic coupling state.
The voltage induced in the sensor coil is configured as a torque signal to be led to the outside from the detector body via the cable. Further, a capacitor bushing terminal is provided at the cable connection portion so that high frequency noise included in the torque signal is not output to the cable together with the torque signal.

FIG. 6 is an axial sectional view of a main part of the torque detection device described above,
FIG. 7 is a partially cutaway plan view of the terminal box portion. The sensor coil (not shown) is arranged on the inner peripheral side of the case 1 of the cylindrical detector body into which the magnetic coupling portion is inserted. As shown in FIG. 7, the outer peripheral side of the case 1 has a square outer shape and an appropriate height, and a terminal mounting hole 2a having a shallow opening and a circular opening cross section is formed in the center thereof. The terminal box portion 2 is attached integrally with the case 1. A square cover mounting plate 3 having the same shape as the outer shape of the terminal box portion 2 is arranged on the opening end surface of the terminal box portion 2 to cover the opening portion of the terminal box portion 2. On the outer surface side of the cover mounting plate 3, the cover mounting plate 3 has substantially the same shape, and the terminal mounting hole 2a is formed in the center.
A cover 4 having the same shape as that of FIG. The outer peripheral edge of the cover 4 is an outer flange 4b.
Has become. On the outer surface side of the outer flange 4b, an ear portion 3a provided at the center of each side of the cover mounting plate 3 is bent, so that the cover 4 is mounted on the cover mounting plate 3. The cover mounting plate 3 and the cover 4 are screwed together.
It is attached to the terminal box portion 2 by 5,5,5,5 (only three are shown). A narrow strip-shaped cable support plate 6 extends in the axial direction from one side of the cover mounting plate 3 that is orthogonal to the axial direction of the detector body, and bends the cable support plate 6 from the bottomed cylindrical portion 4a. It supports the derived cable 7. A grommet 8 that covers the entire inner surface is attached to the inner surface of the bottomed cylindrical portion 4a of the cover 4. The cover mounting plate 3 includes
The conductor penetrates through the center, and the capacitor bushing terminals 10, 10, 10, 10 having a plating layer formed on the outer peripheral surface penetrate through the same line at equal intervals. These capacitor bushing terminals 10, 10, 10, 10 are covered with a cover mounting plate by soldering a Mach layer on the outer peripheral surface and a solder plating layer 11 formed on the surface of the cover mounting plate 3 not facing the cover 4. It is attached to 3. Then, one side of the connecting fittings 12, 12 having a U-shaped cross section is attached to the cover mounting plate 3 on the side not facing the cover 4 with screws 13, 13. On the other side of the connecting fittings 12, 12, a printed circuit board 14 which is disposed in the terminal mounting hole 2a and forms an appropriate control circuit is attached by screws 15, 15. At a predetermined position of the control circuit of the printed board 14, one end portions 10a, 10a, 10a, 10a of the central conductors of the capacitor bushing terminals 10, 10, 10, 10 are connected, and the other end portions 10b, 10b, 10b, 10b, 10b are separately connected to the wires 7a, 7b, 7c, 7d of the cable 7 introduced into the bottomed cylindrical portion 4a.

On the other hand, a predetermined position of the connection circuit formed on the printed circuit board 14 is provided with a sensor coil (not shown) provided on the inner peripheral side of the case 1 via a harness connector 16 connected by a plurality of leads 1, 1 ,. It is connected.

This torque detection device outputs the torque signal detected by the sensor coil to the cable 7 via the control circuit formed on the printed circuit board 14 and the capacitor bushing terminals 10, 10, 10, 10. Further, the high frequency noise included in the torque signal flows out to the cover mounting plate 3 through the capacitor formed by the plating layer on the outer peripheral surface of the capacitor bushing terminal and the central conductor, and outputs only the torque signal.

[Problems to be Solved by the Invention] In a conventional torque detection device, a capacitor bushing terminal is provided on a cover mounting plate 3 having a large area that covers the opening of the terminal box 2.
Since 10,10,10,10 are mounted by soldering, a large heat capacity is required for the soldering and the workability of the soldering work is extremely poor. Further, since the cover mounting plate has a large area, a large amount of plating material is required to form the solder plating layer, resulting in an increase in cost and an increase in cost of the torque detection device.

In view of such a problem, the present invention aims to provide an inexpensive torque detection device, which has good workability when mounting a capacitor bushing terminal, and can reduce the plating cost for forming a solder plating layer. And

[Means for Solving the Problems]

In the torque detecting device according to the present invention, a capacitor bushing terminal for connecting to an electric circuit inside the detector body is soldered to a mounting plate that is arranged across the opening of a terminal box portion provided in the detector body. The capacitor bushing terminal is attached by soldering to a terminal mounting plate that is mounted on the mounting plate and has a smaller area than the opening area of the opening. To do.

[Action]

If you attach a terminal mounting plate that is smaller than the opening area of the opening of the terminal box to the mounting plate that is installed across the opening of the terminal box, solder the capacitor bushing terminals to this terminal mounting plate with a small heat capacity. it can. Further, if the area of the terminal mounting plate is reduced, the cost of plating the terminal mounting plate is reduced.

This reduces the manufacturing cost of the torque detection device.

〔Example〕

 Hereinafter, the present invention will be described in detail with reference to the drawings showing an embodiment thereof.

FIG. 1 is an axial sectional view of a main part of a torque detection device according to the present invention, and FIG. 2 is a partially cutaway plan view of a terminal box part. A sensor coil (not shown) is provided on the inner peripheral side of the case 1 of the cylindrical detector body into which the magnetic coupling portion whose magnetic coupling state changes according to the twist of the input and output shafts is inserted. As shown in FIG. 2, on the outer peripheral side of the case 1, a terminal mounting hole 2a having a square outer shape and an appropriate height and a circular opening cross section and a shallow depth is formed in the central portion thereof. The terminal box portion 2 is attached integrally with the case 1. A square cover mounting plate 3 having the same shape as the outer shape of the terminal box portion 2 is disposed on the opening end surface of the terminal box portion 2 to cover the opening portion of the terminal box portion 2. On the outer surface side of the cover mounting plate 3, a cover 4 having a substantially same shape as the cover mounting plate 3 and having a lower and lower cylindrical portion 4a having substantially the same shape as the above-mentioned mounting hole 2a and having a low height is arranged. I have set up. The outer peripheral end surface of the cover 4 is an outer flange 4b. The cover mounting plate 3 is provided on the outer surface side of the outer flange 4b.
The ears 3a provided at the central portions of the respective sides are bent so that the cover 4 is attached to the cover attaching plate 3.
The cover mounting plate 3 and the cover 4 are connected to the terminal box portion 2 by screws 5, 5, 5, 5 (only three are shown) as shown in FIG.
Installed on. A narrow strip-shaped cable support plate 6 extends in the axial direction from one side of the cover mounting plate 3 orthogonal to the axial direction of the detector body.
Is bent to support the cable 7 extending from the bottomed cylindrical portion 4a. A grommet 8 covering the entire inner surface is closely attached to the inner surface of the bottomed cylindrical portion 4a of the cover 4.
Through holes 3b, 3b, 3b, 3b through which large diameter portions of the capacitor bushing terminals 10, 10, 10, 10 can be inserted are formed at equal intervals on the same line of the cover mounting plate 3. On the surface side of the cover mounting plate 3 that does not face the cover 4, each end is bent in a U shape in the same direction, and a long portion of the strip-shaped terminal mounting plate 20 is brought into contact. Screw the terminal mounting plate 20
It is attached to the cover attachment plate 3 by 3,13. The through hole
3b, 3b, 3b, 3b, at the position of the terminal mounting plate 20 opposed to each other, concentric with the through holes 3b, 3b, 3b, 3b, the small diameter part of the capacitor bushing terminal 10,10,10,10 is inserted. Terminal holes 20a, 20a, 2
0a and 20a are opened respectively. A solder plating layer 11 having a required thickness is formed on the entire surface of the terminal mounting plate 20 that does not face the cover mounting plate 3. The terminal mounting plate 20 is arranged so as to be located in the radial direction of the terminal mounting hole 2a. Then, the terminal mounting plate 20 is disposed in the terminal mounting hole 2a across the board mounting portions 20l, 20r provided by bending each end side, and an appropriate control circuit is printed and wired. The printed circuit board 14 is attached with screws 15 and 15. One end portion 10a, 10a, 10a, 10a of the central conductor of the capacitor bushing terminal 10, 10, 10, 10 is placed at a predetermined circuit position on the printed circuit board 14.
Are connected and their respective other ends 10b, 10b, 10b, 10b
Is the strand of the connecting cable 7 located in the bottomed cylindrical portion 4a
7a, 7b, 7c and 7d are separately connected.

The other end portions 10b, 10b, 10b, 10b of the center conductors of the capacitor bushing terminals 10, 10, 10, 10 are formed in a C shape, and the other end portions 10b, 10b, 10b, 10b are The wire of the cable can be easily wound. A predetermined circuit position of the control circuit formed on the printed circuit board 14 is connected to a sensor coil (not shown) on the inner peripheral side of the case 1 via a harness connector 16 connected by a plurality of lead wires l, l ... It is connected.

The torque detection device configured as described above outputs the torque signal detected by the sensor coil to the control circuit of the printed circuit board 14 via the harness connector 16 and outputs the torque signal of the cable 7 via the capacitor bushing terminals 10, 10, 10, 10. Each wire 7a, 7b, 7c,
Output to 7d. That is, the torque detection device is designed so that the torque signal detected by the sensor coil inside the torque detection device does not lead to the outside through the cable 7 while containing high frequency noise.

FIGS. 3, 4, and 5 are a top view, a side view, and a bottom view of the terminal mounting plate 20, respectively. The terminal mounting plate 20 is composed of a narrow strip metal plate having an area extremely smaller than the opening area of the terminal wiring hole 2a (see FIG. 1) described above. The terminal mounting plate 20 has both ends bent in the same direction at an appropriate length and at a right angle, and at the substantially center of the bent portion in the length direction,
The board mounting portions 20l and 20r are formed by further bending the respective end portions in a direction orthogonal to each other at a right angle. And board mounting part 20l, 2
Forming a respective screw hole 20l _1, 20r ₁ to 0r. Four terminal holes 20a, 20a, through which the large diameter portion of the capacitor bushing terminal 10 can be inserted in the lengthwise portion 20d of the board mounting portion 20 in the lengthwise direction,
20a, 20a are opened at equal intervals. In addition, terminal holes 20a, 20a, 2
The edges facing each other on the side of 0a, 20a are slightly overhanging, and the overhanging parts 20b, 20b are the board mounting parts 20l, 2 respectively.
It is slightly bent to the 0r side and inclined. This prevents the long portion 20d of the terminal mounting plate 20 from being distorted or warped. In addition, the board mounting parts 20l, 20r
A solder plating layer 11 is formed on the surface opposite to.
At each end side of the elongated portion 20d of the terminal mounting plate 20 to form a screw hole 20l _2, 20r ₂ for screwing to the cover mounting plate 3. Further, the connecting portion between the long portion 20d of the terminal mounting plate 20 and the board mounting portions 20l, 20r is provided with cutout holes 20c, 20c in the width direction and the central portion along the length direction, respectively.
The area of 0 is decreasing. Since the terminal mounting plate 20 thus configured is formed in an area smaller than the opening area of the terminal mounting hole 2a, the solder plating layer formed on the terminal mounting plate 20.
The consumption of the plating material 11 is small and the terminal mounting plate 20 can be obtained at low cost. In addition, the capacitor bushing terminals 10, 10, 10, 10 (see FIG. 1) in the terminal holes 20a, 20a, 20a, 20a of the terminal mounting plate 20.
When soldering the capacitor bushing terminals 10, 10, 10, 10 to the terminal mounting plate 20 by inserting, the part to be soldered can be heated with a small heat capacity and soldering can be completed in a short time. Work efficiency is greatly improved. Therefore, the number of manufacturing steps of the torque detection device can be reduced, and the torque detection device can be provided at low cost.

In this embodiment, the terminal mounting plate has a narrow strip shape,
The shape is not limited to this, and may have a structure such as a part having a strip shape. That is, it is sufficient that the area of the terminal mounting plate is smaller than the opening area of the terminal mounting hole, and the shape thereof is not limited. A terminal mounting plate having an area as small as possible is desirable.

[Effect of device]

As described in detail above, in the present invention, the area of the terminal mounting plate is smaller than the opening area of the terminal mounting hole, so that the consumption of the plating material of the solder plating layer formed on the terminal mounting plate is reduced. Further, when the capacitor bushing terminal is soldered to the terminal mounting plate, it can be soldered in a short time with a small heat capacity, the workability of the soldering work can be significantly improved, and the torque detection device can be provided at a low cost, which is an excellent effect. .

[Brief description of drawings]

FIG. 1 is an axial sectional view of an essential part of a torque detecting device according to the present invention, FIG. 2 is a partially cutaway plan view of a terminal box portion, and FIGS. 3 and 4 are top and side views of a terminal mounting plate. 5 is a bottom view of the terminal mounting plate, FIG. 6 is an axial sectional view of a main part of a conventional torque detecting device, and FIG. 7 is a partially cutaway plan view of the terminal box part. 1 ... Case, 2 ... Terminal box part, 2a ... Terminal mounting hole 3 ... Cover mounting plate, 7 ... Cable 10,10,10,10 ... Capacitor bushing terminal 11 ... Solder plating layer, 20 ...... Terminal mounting plate 20l, 20r ...... Board mounting part

Claims (1)

[Scope of utility model registration request] 1. A capacitor bushing terminal connected to an electric circuit inside the detector body is attached by soldering to a mounting plate which is arranged so as to straddle an opening of a terminal box portion provided in the detector body. In the torque detection device, the capacitor bushing terminal is attached by soldering to a terminal attachment plate that is attached to the attachment plate and has an area smaller than the opening area of the opening. .