JP7286090B2 - Fixing structure of hall IC substrate for torque sensor - Google Patents

Description

TECHNICAL FIELD The present invention relates to a structure for fixing a Hall IC substrate for a torque sensor, and in particular, by incorporating a substrate having a Hall IC in a ring-shaped resin holder in a torque sensor through which a torsion bar penetrates, the torque sensor can be easily installed. It is to enable installation of the substrate.

As a conventionally used torque sensor of this type, the configuration shown in FIG. 1 of Patent Document 1 can be disclosed as FIG.
That is, in FIG. 20, a terminal box portion 13 provided with a detector main body is provided outside a case 11 housing a torque sensor arranged around the torsion bar 3, and the bottom of the terminal box portion 13 and the inside of the case 11 are connected. A grommet 40 is provided in the communicating hole 13b connecting the A torque sensing device is disclosed. In this torque detection device, the grommet 40 is made of synthetic resin, and has a surface provided with a plurality of locking projections (not shown) for fixing the connector 23 and a pressing guide piece (not shown) for restraining the wiring. It is A printed circuit board 20 is provided on the outer peripheral side of the torsion bar 3 via a grommet 40 .

Japanese Utility Model Laid-Open No. 6-47835

Since the conventional torque sensor Hall IC substrate fixing structure is constructed as described above, there are the following problems.
That is, in general, bonding or insert molding is used as a method of fixing a substrate to which a Hall IC used in a torque sensor is soldered.
However, bonding requires a jig or device such as a core to hold the board, and insert molding requires positioning of the printed board and heat resistance of the printed board itself, which increases the cost.
In addition, as in the above-mentioned Patent Document 1, when a printed circuit board is installed on the outer peripheral side of the torsion bar via a large grommet, it must be assembled using many parts, and the grommet itself has environmental characteristics. Therefore, it is necessary to use a material excellent in durability, resulting in an increase in cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. Particularly, by incorporating a substrate having a Hall IC into a ring-shaped holder through which a torsion bar is passed, the substrate can be easily installed. It is an object of the present invention to provide a fixing structure for a torque sensor Hall IC substrate.

A torque sensor Hall IC substrate fixing structure according to the present invention comprises a ring-shaped resin holder having a storage space for housing a board having a Hall IC, a ring-shaped metal case provided on the outer periphery of the ring-shaped resin holder, and the housing. a plurality of lead wires housed in a space and connected to the substrate, wherein the lead wires are led out through the upper part of the housing space and formed on the upper surface of the resin of the ring-shaped resin holder. It has a plurality of engaging protrusions, each engaging protrusion is engaged with the ring-shaped metal case, and the lead wire is led out to the outside through a notch formed in the upper surface of the resin. Further, a plurality of locking projections are provided at the entrance of the storage space, and after the substrate is stored in the storage space, the substrate is held in the storage space by the locking projections. .

Since the torque sensor Hall IC substrate fixing structure according to the present invention is configured as described above, the following effects can be obtained. That is, a ring-shaped resin holder having a storage space for housing a board having a Hall IC, a ring-shaped metal case provided on the outer periphery of the ring-shaped resin holder, and a plurality of housings housed in the storage space and connected to the board. and a lead wire, the lead wire is led out to the outside through the upper part of the storage space , has a plurality of engaging projections formed on the upper surface of the resin of the ring-shaped resin holder, and each of the engaging projections The protrusion is engaged with the ring-shaped metal case, and the lead wire is led out to the outside through a notch formed in the top surface of the resin. A torque sensor case can be made with Also, the substrate can be positioned and fixed without using a special jig or device. Furthermore, the substrate can be easily mounted, and the lead wires can be pulled out along the axial direction.
Further, a plurality of locking protrusions are provided at the entrance of the storage space, and after the board is stored in the storage space, the board is held in the storage space by the locking protrusions. Therefore, it is possible to greatly facilitate mounting of the substrate when assembling the torque sensor .

1 is a perspective view showing a ring-shaped resin holder of a first embodiment of a fixing structure for a torque sensor Hall effect IC substrate according to the present invention; FIG. 2 is an exploded perspective view showing a state in which lead wires are connected to the ring-shaped resin holder of FIG. 1; FIG. 3 is a perspective view showing a state in which a ring-shaped metal case is attached to the ring-shaped resin holder of FIG. 2; FIG. 4 is a front view of FIG. 3; FIG. 2 is an enlarged view showing a main part of FIG. 1; FIG. FIG. 6 is a configuration diagram showing a state in which lead wires are connected to a substrate in the housing space of FIG. 5; FIG. 7 is a perspective view showing a grommet used for sealing the storage space of FIG. 6; FIG. 6 is a front view of the ring-shaped resin holder of FIG. 5; FIG. 7 is a front view of the ring-shaped resin holder of FIG. 6; 3 is an enlarged front view showing the substrate of FIG. 2; FIG. FIG. 10 is an exploded perspective view showing a second embodiment of a ring-shaped resin holder according to the present invention; FIG. 12 is a perspective view showing the ring-shaped resin holder of FIG. 11; 13 is an enlarged plan view of the main part of FIG. 12; FIG. FIG. 13 is a plan view of FIG. 12; 15 is a plan view showing a state in which a ring-shaped metal case is attached to the ring-shaped resin holder of FIG. 14; FIG. FIG. 16 is a cross-sectional view taken along the line AA of FIG. 15; 16 is an enlarged cross-sectional view showing a main part of FIG. 15; FIG. FIG. 15 is a perspective view of FIG. 14; FIG. 19 is a plan view of FIG. 18; FIG. 10 is a cross-sectional view of a conventional torque sensor;

In the torque sensor Hall IC substrate fixing structure according to the present invention, the substrate can be easily installed in the torque sensor by embedding the substrate having the Hall IC in the ring-shaped resin holder in the torque sensor through which the torsion bar penetrates. It can be performed.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a torque sensor Hall IC substrate fixing structure according to the present invention will be described below with reference to the drawings.
Identical or equivalent portions to those of the conventional example are denoted by the same reference numerals.
Reference numeral 21 in FIG. 1 denotes an injection-molded ring-shaped resin holder. The ring-shaped resin holder 21 has a bag-like overall shape, and a plurality of engaging projections 23 extend from the upper surface 22 of the resin. It is formed in a state where it rises along the axial direction P integrally.

The engaging projection 23 has a substantially wedge-shaped overall shape and a claw portion 23a. As shown in FIGS. 3 and 5, when the ring-shaped metal case 11 is provided so as to cover the outside of the ring-shaped resin holder 21 so as to form a double layer, the claw portions 23a of the engaging projections 23 are arranged in the ring-shaped manner. The ring-shaped resin holder 21 and the ring-shaped metal case 11 are configured to engage with the metal upper surface 11a of the metal case 11 and be integrally connected to each other. In the above-described case, each engaging projection 23 may form an engaging recess (not shown) in the metal upper surface 11a, and the claw portion 23a may be engaged with the ring-shaped metal case 11 through this engaging recess.

A storage space 24 is formed in a part of the outer circumference 21 a of the ring-shaped resin holder 21 using the space inside the ring-shaped resin holder 21 .
A notch 25 communicating with the storage space 24 is formed in a part of the upper resin surface 22 of the ring-shaped resin holder 21 .
A substrate 20 having a Hall IC 20A (see FIG. 10) and the like mounted thereon is inserted into the storage space 24 as shown in FIG. A lead wire 26 connected to the substrate 20 is bent in an L shape and configured to be locked in the notch 25 .
The straight portion 26a of the lead wire 26 is configured to extend along the axial direction P as shown in FIG.

3 and 4, as described above, the ring-shaped resin holder 21 is covered with the ring-shaped metal case 11, and the ring-shaped resin holder 21 is integrally formed by the engagement protrusions 23. A sensor 30 is shown. As shown in FIG. 1, if the torsion bar 3 is provided through the axial center of the torque sensor 30 along the axial direction P, the torsion of the torsion bar by the torque sensor 30 can be detected.
In the above-described case, since the ring-shaped resin holder 21 and the ring-shaped metal case 11 are joined and assembled using the respective engaging projections 23, the use of the adhesive 90 for the torque sensor 30 is not necessary for the storage. Since it is only necessary to supply a small amount only to the space 24, the adhesive 90 is not exposed to the outside.
In FIGS. 2 and 3 , the “upper portion” described in claim 1 indicates the direction perpendicular to the plane forming the “ring shape” of the ring-shaped resin holder 21 and the ring-shaped metal case 11 .

5 and 6, a pair of locking projections 31 are provided on the entrance 24a side of the storage space 24 of the ring-shaped resin holder 21 shown in FIGS. 1 and 2 above.
When the board 20 having the lead wires 26 shown in FIG. The crimp terminals 26b other than the straight portions 26a of the lead wires 26 connected to the substrate 20 are housed in the housing space 24. As shown in FIG.

What is shown in FIG. 7 is a rubber grommet 40. As shown in FIG. The inlet 24a is sealed with an adhesive 90 made of epoxy, silicone, or the like to the storage space 24, or the grommet 40 is used to seal the inlet 24a.

FIG. 8 is a front view of the ring-shaped resin holder 21 using the configuration of FIG.
FIG. 9 is a front view of the ring-shaped resin holder 21 using the configuration of FIG.
In FIG. 10, as also shown in FIG. 11, a plurality of rounded portions 20b are formed at the corners of the peripheral surface 20a of the substrate 20 which is connected to the lead wire 26 and provided with the Hall IC 20A. 3 shows a configuration that facilitates insertion of the substrate 20 into the storage space 24. FIG.

FIG. 11 shows a ring-shaped resin holder according to a second embodiment of the present invention. , the ring-shaped resin holder 21 is formed with a storage space 24 that opens in the upper surface 22 of the resin.
As shown in FIGS. 11, 12, 13 and 14, the storage space 24 is formed in an arc shape by cutting out a part of the circular resin top surface 22 of the ring-shaped resin holder 21. is used.

12 to 19, the annular resin holder 21 has an inner wall 21A and an outer wall 21B forming a storage space 24. As shown in FIG.
The inner wall 21A and the outer wall 21B are formed with a pair of first and second board stopper projections 50 and 51, respectively. The protrusions 50, 50 are formed in a spaced apart state.

Since the width of the gap G between the tip of each of the first board fixing protrusions 50 and the tip of each of the second board fixing protrusions 51 and 51 is substantially equal to the thickness of the board 20, A substrate 20 is vertically inserted and held.

FIG. 14 is a plan view showing a state in which FIGS. 12 and 13 are combined. At a position adjacent to the storage space 24, a reinforcing portion 60 is provided for integrally reinforcing the inner wall 21A and the outer wall 21B. formed.

FIG. 15 shows a state in which the outer side of the ring-shaped resin holder 21 is covered with the ring-shaped metal case 11 and a pair of mounting bodies 70 and 71 are provided on the outer periphery of the ring-shaped metal case 11 .
FIG. 16 is a cross-sectional view of the torque sensor 30 cut along the line AA of FIG. 15. The periphery of the substrate 20 is filled with an adhesive (made of epoxy, silicon, etc.) 90 for waterproofing. .

Figures 17, 18 and 19 illustrate the second form of torque sensor 30 shown in Figures 12-15. Although not shown, the top surface 91 of the storage space 24 may be constructed by extending a portion of the ring-shaped metal case 11 and covering it with metal.
Further, as shown in FIG. 11, a lid body 24E separate from the ring-shaped metal case 11 can be provided on the top surface 91. As shown in FIG.

A torque sensor Hall IC substrate fixing structure according to the present invention is such that a ring-shaped metal case is attached to the outside of a ring-shaped resin holder, and a substrate having a Hall IC is attached in a storage space formed in the ring-shaped resin holder. As a result, a torque sensor that is significantly smaller and simpler than the conventional one can be obtained.

3 torsion bar 11 annular metal case 11a metal upper surface 20 substrate 20A hall IC
20a Peripheral surface 20b R portion 21 Ring-shaped resin holder 21A Inner wall 21B Outer wall 21a Outer periphery 22 Upper surface of resin 23 Engagement protrusion 23a Claw portion 24 Storage space 24E Lid 24a Entrance 25 Notch 26 Lead wire 26a Straight portion 30 Torque sensor 31 Engagement Retaining protrusion 40 Grommet 50 First board securing protrusion 51 Second board securing protrusion 60 Reinforcement part 70, 71 Mounting body 90 Adhesive (epoxy or silicon)
91 Top face G Gap

Claims (2)

A ring-shaped resin holder (21) having a storage space (24) for housing a substrate (20) having a Hall IC (20A), and a ring-shaped metal case provided on an outer circumference (21a) of the ring-shaped resin holder (21). (11), and a plurality of lead wires (26) housed in the housing space (24) and connected to the substrate (20),
The lead wire (26) is led out to the outside through the upper part of the storage space (24) .
A plurality of engaging projections (23) are formed on the resin upper surface (22) of the ring-shaped resin holder (21), and each of the engaging projections (23) is engaged with the ring-shaped metal case (11). A fixing structure for a torque sensor Hall IC substrate, wherein the lead wire (26) is lead out to the outside through a notch (25) formed in the upper surface of the resin (22). The inlet (24a) of the storage space (24) has a plurality of locking projections (31). After the substrate (20) is stored in the storage space (24), the locking projections (31) 2. A fixing structure for a torque sensor Hall effect IC substrate according to claim 1 , wherein said substrate (20) is held in said housing space (24) by means of said holding means.

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