JP2020118599A - Sensor device - Google Patents

Abstract

To provide a sensor device which can prevent a sealing member from displacing from a predetermined position to which a sealing member is attached.SOLUTION: A O-ring 100 is inserted as a sealing member between a sensor housing 23 and a sensor body part 50. The O-ring 100 seals the position of the sensor housing 23 where the sensor body part 50 is assembled. A third outer round surface 55c includes: an attachment part where the O-ring 100 is attached; and a movement suppression part 120 located nearer to the sensor housing 23 than the attachment part is, the movement suppressing part preventing the O-ring 100 from displacing from the attachment part.SELECTED DRAWING: Figure 1

Description

The present invention relates to a sensor device.

As shown in Patent Document 1, the torque detection device is assembled to a housing that houses the pinion shaft that is the detection target. An O-ring is sandwiched between the torque detection device and the housing. The O-ring seals the portion of the housing where the torque detector is assembled.

JP, 2009-162541, A

When the torque detection device is assembled to the housing, the O-ring may be displaced following the assembly of the torque detection device. When the O-ring is assembled while being displaced from the predetermined position where the O-ring is attached, the sealing property of the portion of the housing where the torque detection device is assembled is deteriorated.

An object of the present invention is to prevent the sealing member from shifting from a predetermined position where the sealing member is attached.

A sensor device for solving the above-mentioned problems, a sensor housing for accommodating a detection target, a sensor main body having a sensor for detecting a change in magnetism in the detection target while being assembled to the sensor housing, the sensor housing, and the In a sensor device provided between members of a sensor main body and having a sealing member for sealing between the members, a ring formed by being partitioned by the sensor housing and the sensor main body While the sealing member is arranged in the space, at least one surface of the surfaces of the sensor housing and the sensor main body forming the annular space is a mounting portion to which the sealing member is mounted, And a movement restraining portion that is formed closer to the sensor housing than the mounting portion and that restrains the sealing member from shifting from the mounting portion.

When the sensor main body is assembled to the sensor housing, the sealing member may be displaced from the mounting portion following the assembly of the sensor main body. According to the above configuration, the movement suppressing portion is provided for suppressing the displacement of the sealing member from the mounting portion to which the sealing member is mounted. Therefore, when the sensor body is assembled to the sensor housing, even if a force to shift the sealing member from the mounting portion acts, the movement suppressing portion prevents the sealing member from being displaced from the mounting portion. be able to. As a result, it is possible to suppress the deterioration of the sealing property of the portion of the sensor housing where the sensor main body is assembled.

In the above-described sensor device, the sensor main body portion is configured as a resin molded product, and in the surface having the attachment portion and the movement restraint portion, the movement restraint portion projects radially outward from the attachment portion. Is preferred.

According to the above configuration, when the sensor main body is assembled to the sensor housing and the sealing member is displaced from the mounting portion, the sealing member comes into contact with the movement suppressing portion. As a result, it is possible to suppress the displacement of the sealing member from the mounting portion.

In the above-described sensor device, a recess is formed in an end surface of the sensor main body portion that is connected to the surface having the attachment portion and the movement suppressing portion and that faces the sensor housing, and the movement suppressing portion is formed. Is provided on the outer side of the recess in the radial direction, and is raised to the outer side of the mounting portion in the radial direction, and the movement restraining section preferably has a tapered shape toward the tip thereof.

According to the above configuration, when the sensor main body is assembled to the sensor housing, even if a force that displaces the sealing member from the mounting portion acts, the sealing member is located radially outside the mounting portion. It abuts against the raised movement restraining portion. As a result, it is possible to suppress the displacement of the sealing member from the mounting portion.

In the above sensor device, it is preferable that a cross-sectional shape of a tip of the movement suppressing portion is curved in a vertical cross section of the sensor main body.
According to the above configuration, when the sealing member is about to be displaced from the mounting portion, the sealing member comes into contact with the movement suppressing portion. In this case, since the cross-sectional shape of the tip of the movement suppressing portion with which the sealing member comes into contact is curved, it is possible to prevent the sealing member from being damaged by the surface shape of the movement suppressing portion.

In the above sensor device, it is preferable that the surface roughness of the movement suppressing portion is set to be rougher than the surface roughness of the mounting portion.
According to the above configuration, when the sensor main body is assembled to the sensor housing, even if a force to displace the sealing member from the mounting portion acts, the sealing member has a surface roughness larger than that of the mounting portion. It comes into contact with the movement restraining part whose roughness is roughly set. Since the frictional force acting between the sealing member and the movement suppressing portion is larger than the frictional force acting between the sealing member and the mounting portion, it is possible to suppress the displacement of the sealing member from the mounting portion. be able to.

According to the sensor device of the present invention, it is possible to suppress the displacement of the sealing member from the predetermined position where the sealing member is attached.

The schematic sectional drawing of the torque sensor of 1st Embodiment. The schematic top view of the torque sensor of 1st Embodiment. In the torque sensor of the first embodiment, a schematic cross-sectional view of a sealing member and a movement suppressing portion provided between the sensor body and the sensor housing. (A) is a schematic cross-sectional view of a sensor main body and a mold used for molding the sensor main body in the torque sensor of the first embodiment, and (b) is a movement restraining portion and movement of the first embodiment. The schematic sectional drawing of the metal mold|die used when molding a suppression part. In the torque sensor of the second embodiment, a schematic cross-sectional view of a sealing member and a movement suppressing portion provided between the sensor body and the sensor housing. In the torque sensor of 3rd Embodiment, schematic sectional drawing of the sealing member provided between a sensor main-body part and a sensor housing, and a movement suppression part. The schematic sectional drawing of the metal mold|die used when shape|molding the movement suppression part and movement suppression part of 3rd Embodiment. In the torque sensor of 4th Embodiment, schematic sectional drawing of the sealing member and movement suppression part which are provided between a sensor main-body part and a sensor housing. The schematic sectional drawing of the metal mold|die used when shape|molding the movement suppression part and movement suppression part of 4th Embodiment. In the torque sensor of 5th Embodiment, schematic sectional drawing of the sealing member and movement suppression part which are provided between a sensor main-body part and a sensor housing. The schematic sectional drawing of the metal mold|die used when shape|molding the movement suppression part and movement suppression part of 5th Embodiment.

<First Embodiment>
A first embodiment of the torque sensor will be described.
As shown in FIG. 1, a torque sensor 1 as a sensor device is provided on the outer periphery of a pinion shaft 3 that constitutes a steering shaft 2 of an electric power steering device. The torque sensor 1 detects a steering torque input by a driver's steering operation. The detection target of the torque sensor 1 is the pinion shaft 3.

The pinion shaft 3 includes an input shaft 11, an output shaft 12, and a torsion bar 13 that connects the input shaft 11 and the output shaft 12. The input shaft 11 is formed in a hollow shaft shape. A steering wheel is connected to an upper end of the input shaft 11 opposite to the output shaft 12 via an intermediate shaft and a column shaft. The output shaft 12 is formed in a shaft shape having an insertion hole 14 that opens to the input shaft 11 side. A rack shaft is connected to a lower end portion of the output shaft 12 opposite to the input shaft 11. The steering wheel side in the axial direction Z of the pinion shaft 3 is the upper end side, and the rack shaft side is the lower end side. One end of the torsion bar 13 is inserted into the input shaft 11 and is coaxially and rotatably connected to the input shaft 11, and the other end is inserted into the insertion hole 14 and coaxial with the output shaft 12. They are connected so that they can rotate together. The pinion shaft 3 is configured such that the input shaft 11 and the output shaft 12 rotate relative to each other by twisting the torsion bar 13 in accordance with the steering torque input by the driver's steering operation.

As shown in FIGS. 1 and 2, the torque sensor 1 includes a magnet unit 21 that is integrally rotatable with the input shaft 11, a magnetic yoke unit 22 that is integrally rotatable with the output shaft 12, and a magnet unit. 21 and a sensor housing 23 that houses the magnetic yoke unit 22. The sensor housing 23 is a substantially cylindrical body that opens in the axial direction Z of the pinion shaft 3, and the pinion shaft 3 is inserted through the opening. The sensor housing 23 is made of resin. The bearing 15 is provided between the inner peripheral surface of the boundary portion between the sensor housing 23 and the rack housing 16 and the outer peripheral surface of the output shaft 12. The output shaft 12 is rotatably supported by the inner peripheral surfaces of the sensor housing 23 and the rack housing 16 via a bearing 15. The input shaft 11 is rotatably supported on the inner peripheral surface of the sensor housing 23 via a bearing 17. A bearing 17 and a lip seal 18 are provided between the input shaft 11 and the inner peripheral surface on the upper end side of the sensor housing 23. The lip seal 18 is provided on the upper end side of the bearing 17. Further, the sensor housing 23 has an opening 26 formed on its side surface. The opening 26 opens in the radial direction of the pinion shaft 3, that is, in the direction X orthogonal to the axial direction Z. The opening portion 26 has a plurality of inner peripheral annular surfaces. The first inner circumferential annular surface 26a is an annular inner circumferential surface that is located at the outermost radial direction in the opening 26 and has a width direction that is the same as the direction X. The width direction of the first inner circumferential annular surface 26a is a direction orthogonal to the circumferential direction of the first inner circumferential annular surface 26a. The second inner peripheral annular surface 26b is an annular end surface whose width direction is the same as the direction orthogonal to the direction X. The width direction of the second inner peripheral annular surface 26b is the radial direction of the second inner peripheral annular surface 26b. A radially outer end edge of the second inner peripheral annular surface 26b is connected to an end edge of the first inner peripheral annular surface 26a on the pinion shaft 3 side. The third inner peripheral annular surface 26c is an annular inner peripheral surface whose width direction is the same as the direction X. The width direction of the third inner peripheral annular surface 26c is a direction orthogonal to the circumferential direction of the third inner peripheral annular surface 26c. An edge of the third inner peripheral annular surface 26c on the side opposite to the pinion shaft 3 is connected to an inner edge of the second inner peripheral annular surface 26b in the radial direction. The inner diameter of the third inner peripheral annular surface 26c is set smaller than the inner diameter of the first inner peripheral annular surface 26a. The second inner peripheral annular surface 26b is formed with a groove groove 26d extending annularly over the entire circumference. The recessed groove 26d is located radially inward of the center of the second inner circumferential annular surface 26b in the direction orthogonal to the direction X. The outer peripheral surface of the sensor housing 23 is formed so that the diameter increases from the upper end toward the lower end. As shown in FIG. 2, at the lower end of the sensor housing 23, two fixing portions 27 protruding in the direction Y are provided. The two fixing portions 27 are separated from each other in the direction Y from the axis of the pinion shaft 3. The direction Y is a direction orthogonal to the direction X and the axial direction Z. The fixing portion 27 is provided with a bolt hole 28 that penetrates in the axial direction Z. A fixing portion (not shown) is provided on the upper end of the rack housing 16, and the fixing portion is provided with a bolt hole. The sensor housing 23 is fixed to the rack housing 16 by screwing bolts into the bolt holes 28 of the sensor housing 23 and the rack housing 16 at the positions where they overlap in the axial direction Z. Two fixing portions 29 are provided on the side surface of the sensor housing 23. The two fixing portions 29 respectively project in the direction Y around the opening 26. The two fixing portions 29 are separated from each other in the direction Y from the center of the opening 26. The fixing portion 29 is provided with a bolt hole 30 penetrating in the direction X.

As shown in FIG. 1, the magnet unit 21 includes an annular fixing member 31 that is integrally rotatably fixed to the outer peripheral surface of the input shaft 11, and an annular ring that is integrally rotatably fixed to the outer peripheral surface of the fixing member 31. And an annular magnet 32. The annular magnet 32 is magnetized so that magnetic poles having different polarities are alternately arranged in the circumferential direction. The magnet unit 21 and the annular magnet 32 are arranged coaxially with the pinion shaft 3. The magnet unit 21 and the annular magnet 32 are fixed to the central portion in the axial direction Z on the outer peripheral surface of the input shaft 11. The opening 26, the magnet unit 21, and the annular magnet 32 are arranged side by side in the direction X.

The magnetic yoke unit 22 includes a fixing member 33 fixed to the outer peripheral surface of the output shaft 12, a cylindrical yoke holder 34 fixed to the outer peripheral surface of the fixing member 33, and a first magnetic member integrally held by the yoke holder 34. A yoke 35 and a second magnetic yoke 36 are provided. The fixing member 33 is fixed to the upper end side end portion of the outer peripheral surface of the output shaft 12. The lower end of the yoke holder 34 is fitted to the outer peripheral surface of the fixing member 33. The yoke holder 34 faces the annular magnet 32 of the magnet unit 21 with a gap in the radial direction, that is, the direction X or the direction Y. The first magnetic yoke 35 and the second magnetic yoke 36 are arranged to face each other with a predetermined gap in the axial direction Z. The first magnetic yoke 35 is provided on the upper end side in the axial direction Z with respect to the second magnetic yoke 36. The first magnetic yoke 35 has an annular first main body portion 37 and a plurality of first claw portions 38 extending from the first main body portion 37 toward the second magnetic yoke 36. The first claw portions 38 are arranged at equal intervals in the circumferential direction of the first body portion 37. The second magnetic yoke 36 has an annular second main body 39 and a plurality of second claws 40 extending from the second main body 39 to the first magnetic yoke 35 side. The second claw portions 40 are arranged at equal intervals in the circumferential direction of the second body portion 39. The first claw portion 38 and the second claw portion 40 are each formed in a substantially isosceles triangular shape. The first claw portion 38 and the second claw portion 40 are molded by the yoke holder 34 in a state of being displaced from each other at a constant interval in the circumferential direction. In a neutral state where the torsion bar 13 between the input shaft 11 and the output shaft 12 is not twisted, the tip of the first claw portion 38 of the first magnetic yoke 35 and the tip of the second claw portion 40 of the second magnetic yoke 36. Indicates the boundary between the north and south poles of the annular magnet 32.

The torque sensor 1 includes an annular first magnetic flux collecting ring 41 that guides and collects the magnetic flux of the first magnetic yoke 35, and an annular second magnetic flux collecting ring 42 that guides and collects the magnetic flux of the second magnetic yoke 36. have. The first magnetic flux collecting ring 41 and the second magnetic flux collecting ring 42 are embedded and fixed in the sensor housing 23. The first magnetic flux collecting ring 41 includes a first ring portion 41 a, which is arranged outside the first magnetic yoke 35 in the radial direction so as to surround the first magnetic yoke 35 with a predetermined gap, and a first ring portion 41 a. It has the 1st magnetism collection part 41b extended toward the diameter direction outside. The first magnetism collecting portion 41b is exposed on the upper end side of the third inner peripheral annular surface 26c of the opening 26. The second magnetism collecting ring 42 includes a second ring portion 42 a, which is arranged outside the second magnetic yoke 36 in the radial direction so as to surround the second magnetic yoke 36 with a predetermined gap, and a second ring portion 42 a. The second magnetic flux collecting portion 42b extends outward in the radial direction. The second magnetism collecting part 42b is exposed at the lower end side of the third inner peripheral annular surface 26c of the opening 26. With the first magnetism collecting ring 41 arranged on the outer circumference of the first magnetic yoke 35 and the second magnetism collecting ring 42 arranged on the outer circumference of the second magnetic yoke 36, the first magnetism collecting part 41 b and the second magnetism collecting part 41 The portion 42b is arranged to face each other with a predetermined gap in the axial direction Z.

The torque sensor 1 includes a sensor body 50 having a sensor unit 51 that detects a magnetic flux passing through the magnetic yoke unit 22. The sensor main body 50 has a substantially cylindrical shape, and the sensor unit 51 is fixed to the inner circumference thereof. The sensor unit 51 has a magnetic detection element 52 and a circuit member 53. The magnetic detection element 52 is composed of, for example, a Hall IC. The circuit member 53 includes a bus bar 53a connected to the magnetic detection element 52 and an electronic component 53b such as a capacitor connected to the bus bar 53a. The sensor main body 50 is configured as a resin molded product in which the sensor unit 51 is insert-molded. The sensor unit 51 corresponds to the sensor described in the claims.

The sensor main body portion 50 is inserted in the opening 26 of the sensor housing 23 in the order from the inner side in the radial direction of the pinion shaft 3 to the outer side in the radial direction. It has a flange portion 57 in which a bolt hole 56 for fixing the main body portion 50 to the sensor housing 23 is formed, and a tubular portion 58. The insertion portion 55 has a plurality of outer peripheral annular surfaces. The insertion portion 55 has a first outer peripheral annular surface 55a, a second outer peripheral annular surface 55b, a third outer peripheral annular surface 55c, and a fourth outer peripheral annular surface 55d in order from the radially outer side to the radially inner side of the pinion shaft 3. doing.

The first outer peripheral annular surface 55a is an annular outer peripheral surface whose width direction is the same as the direction X. The width direction of the first outer peripheral annular surface 55a is a direction orthogonal to the circumferential direction of the first outer peripheral annular surface 55a. The second outer peripheral annular surface 55b is an annular end surface whose width direction is the same as the direction orthogonal to the direction X. The width direction of the second outer peripheral annular surface 55b is the radial direction of the second outer peripheral annular surface 55b. The radially outer end of the second outer peripheral annular surface 55b is connected to the end of the first outer peripheral annular surface 55a on the pinion shaft 3 side. The third outer peripheral annular surface 55c is an annular outer peripheral surface whose width direction is the same as the direction X. The width direction of the third outer peripheral annular surface 55c is a direction orthogonal to the circumferential direction of the third outer peripheral annular surface 55c. An edge of the third outer peripheral annular surface 55c on the side opposite to the pinion shaft 3 is connected to a radially inner edge of the second outer peripheral annular surface 55b. The fourth outer peripheral annular surface 55d is an annular end surface whose width direction is the same as the direction orthogonal to the direction X. The width direction of the fourth outer peripheral annular surface 55d is the radial direction of the fourth outer peripheral annular surface 55d. A radially outer end edge of the fourth outer peripheral annular surface 55d is connected to an end edge of the third outer peripheral annular surface 55c on the pinion shaft 3 side. The outer diameter of the first outer peripheral annular surface 55a is set to be larger than the outer diameter of the third outer peripheral annular surface 55c. The fourth outer peripheral annular surface 55d is formed with a ridge 55e extending annularly over the entire circumference. The ridge 55e is located radially inward of the center of the fourth outer peripheral annular surface 55d in the direction orthogonal to the direction X. The length of the first outer peripheral annular surface 55a and the third outer peripheral annular surface 55c in the direction X is set to be equal to or less than the length of the first inner peripheral annular surface 26a in the direction X. The fourth outer peripheral annular surface 55d corresponds to the end surface described in the claims.

The outer peripheral shape of the flange portion 57 when viewed in the direction X is substantially rectangular. The lengths of the outer peripheral surface 57a of the flange portion 57 in the axial direction Z and the direction Y are set to be larger than the outer diameter of the first outer peripheral annular surface 55a. The cylindrical portion 58 has a rectangular outer peripheral shape when viewed in the direction X. The lengths of the outer peripheral surface of the tubular portion 58 in the axial direction Z and the direction Y are set to be smaller than the lengths of the outer peripheral surface 57a of the flange portion 57 in the axial direction Z and the direction Y, respectively.

As shown in FIG. 2, the length of the flange portion 57 in the direction Y is the same as the length of the fixing portion 29 of the sensor housing 23 in the direction Y. The outer peripheral shape of the flange portion 57 when viewed from the direction X is the same as the outer peripheral shape of the fixed portion 29 when viewed from the direction X. The flange portion 57 is provided with bolt holes 56 in the direction Y with the tubular portion 58 sandwiched therebetween when viewed from the direction X. The bolt hole 56 of the flange portion 57 penetrates the flange portion 57 in the direction X, and its arrangement corresponds to the bolt hole 30 of the fixing portion 29.

The sensor body 50 has a communication path P extending in the direction X. The magnetic detecting element 52 is exposed at the end opening of the communication path P on the sensor housing 23 side. The communication passage P located inside the tubular portion 58 of the sensor body 50 in the radial direction, that is, the end opening of the communication passage P opposite to the sensor housing 23 has an end portion of the bus bar 53a opposite to the pinion shaft 3. Is exposed. The end portion of the bus bar 53a is connected to the control device 59 via an external terminal.

The sensor body 50 is fixed to the sensor housing 23 with the insertion portion 55 of the sensor body 50 inserted in the opening 26 of the sensor housing 23. When the insertion portion 55 is inserted into the opening 26, the convex groove portion 55e of the fourth outer peripheral annular surface 55d fits into the groove groove 26d of the second inner peripheral annular surface 26b. Further, in the state where the insertion portion 55 is inserted into the opening 26, the first outer peripheral annular surface 55a and the third outer peripheral annular surface 55c are opposed to each other radially inward of the first inner peripheral annular surface 26a. In these states, the bolt 60 is inserted and screwed into the bolt hole 56 of the sensor body 50 and the bolt hole 30 of the sensor housing 23. Thereby, the sensor body 50 is assembled to the sensor housing 23. In the state where the sensor main body 50 is assembled to the sensor housing 23, the magnetic detection element 52 includes the first magnetism collecting part 41 b of the first magnetism collecting ring 41 and the second magnetism collecting part 42 b of the second magnetism collecting ring 42. It is located in between. The magnetic detection element 52 generates a magnetic detection signal according to the detected magnetism.

In the torque sensor 1 configured as described above, the magnetic flux passing through the first magnetism collecting ring 41 and the second magnetism collecting ring 42 changes according to the twist of the torsion bar 13, so that the magnetic field detected by the magnetic detection element 52 is detected. The detection signal changes. The magnetic detection signal detected by the magnetic detection element 52 is output to the control device 59 via the bus bar 53a and an external terminal connected to the bus bar 53a. The control device 59 calculates the steering torque based on the magnetic detection signal. The control device 59 executes control for assisting the driver's steering operation based on the calculated steering torque.

As shown in FIGS. 1 and 3, an O-ring 100 as a sealing member is sandwiched between the sensor housing 23 and the sensor body 50. With this O-ring 100, the portion of the sensor housing 23 where the sensor main body 50 is assembled is sealed. The O-ring 100 has a circular cross section in the axial direction. The O-ring 100 includes a first inner peripheral annular surface 26a of the sensor housing 23, a second inner peripheral annular surface 26b of the sensor housing 23, a second outer peripheral annular surface 55b of the sensor body 50, and a second inner peripheral annular surface 55b of the sensor body 50. It is arranged in an annular space surrounded by three outer peripheral annular surfaces 55c. The third outer peripheral annular surface 55c of the sensor body 50 corresponds to at least one of the surfaces of the sensor housing and the sensor body that form the annular space described in the claims. The third outer peripheral annular surface 55c is formed with a mounting portion 110 to which the O-ring 100 is mounted, and is formed closer to the sensor housing 23 than the mounting portion 110, and prevents the O-ring 100 from being displaced from the mounting portion 110. A protrusion 122 serving as the movement suppressing portion 120 is provided.

In the present embodiment, the recess 121 is formed in the fourth outer peripheral annular surface 55d of the sensor body 50. The recess 121 is located radially outward of the ridge 55e in the direction orthogonal to the direction X of the fourth outer peripheral annular surface 55d. The recesses 121 are provided at a plurality of locations on the fourth outer peripheral annular surface 55d, and are arranged at equal intervals in the circumferential direction. The recess 121 extends in the circumferential direction. The projecting portion 122 is provided on the third outer peripheral annular surface 55c on the outer side in the radial direction of the recess 121, and is protruded on the outer side in the radial direction with respect to the mounting portion 110. The radial direction of the recess 121 and the protrusion 122 is a direction orthogonal to the direction X. The side closer to the central axis of the sensor body 50 is the radially inner side, and the side away from the central axis of the sensor body 50 is the radially outer side. The central axis of the sensor body 50 coincides with the central axis of the third outer peripheral annular surface 55c, for example. The protrusions 122 are provided at a plurality of locations on the third outer peripheral annular surface 55c and are arranged at equal intervals in the circumferential direction. Further, the length of the concave portion 121 in the direction orthogonal to the direction X is set to be longer as it gets closer to the sensor housing 23. The length in the direction orthogonal to the direction X of the central portion in the circumferential direction of the recess 121 is longer than the length in the direction orthogonal to the direction X of both end portions in the circumferential direction of the recess 121. When viewed in a vertical cross section including the direction X and the axial direction Z, the protruding portion 122 has a tapered shape in which the thickness decreases toward the tip. The vertical cross section is a cross section including the direction X and the axial direction Z while passing through the central axis of the sensor body 50. In the vertical cross section of the sensor main body 50, the cross-sectional shape of the tip of the protrusion 122 is curved.

A method of forming the protrusion 122 will be described.
As shown in FIG. 4A, the sensor main body 50 is molded by solidifying the molten resin poured into the space formed between the first mold 130 and the second mold 131. The first die 130 and the second die 131 are divided at a parting line. The parting line is a line that divides between the first mold 130 and the second mold 131, and is set so as to be located on the outer peripheral surface 57a of the flange portion 57 of the sensor body 50. The inner surface shape of the first mold 130 has a shape corresponding to the outer surface shape of part of the insertion portion 55 and the flange portion 57. The inner surface shape of the second mold 131 has a shape corresponding to a part of the flange portion 57 and the outer surface shape of the tubular portion 58. After the sensor body 50 is molded, burrs are generated on the sensor body 50 along the parting line. The location where the burr is generated is the outer peripheral surface 57a of the flange portion 57, not the second outer peripheral annular surface 55b and the third outer peripheral annular surface 55c. No burr is generated along the parting line on the mounting portion 110 to which the O-ring 100 is mounted.

The first mold 130 has an inner surface shape for molding the protrusion 122. After the sensor body 50 is molded, in a state where the sensor body 50 is housed inside the first mold 130, the protrusion 122 of the protrusion 122 does not protrude radially outward from the mounting portion 110, The outer diameter of the mounting portion 110 and the outer diameter of the protruding portion 122 are equal. After the sensor main body 50 is molded, in the state where the sensor main body 50 is housed inside the first mold 130, the length in the direction orthogonal to the direction X of the central portion in the circumferential direction of the recess 121 is the recess 121. It is the same as the length in the direction orthogonal to the direction X of both end portions in the circumferential direction of As shown in FIG. 4A, the length of the recess 121 in the direction orthogonal to the direction X is set longer as it gets closer to the sensor housing 23.

As shown in FIG. 4B, the temperature of the sensor main body 50 immediately after being taken out from the first mold 130 and the second mold 131 decreases due to the temperature of the outside air. Therefore, molding contraction occurs in the sensor body 50 immediately after being taken out from the first mold 130 and the second mold 131. The protrusion 122 has a tapered shape toward the tip thereof, and since the recess 121 is located inside the protrusion 122 in the radial direction, the protrusion 122 is positioned radially outside the mounting portion 110 due to molding contraction. Will be raised. As a result, the length of the recess 121 in the direction orthogonal to the direction X is longer in the central portion than in the circumferential end portions of the recess 121. Thus, the protrusion 122 can be formed by using a so-called resin sink.

The operation and effect of the first embodiment will be described.
(1) When the sensor main body 50 is assembled to the sensor housing 23, the O-ring 100 attached to the insertion portion 55 of the sensor main body 50 is in contact with the first inner peripheral annular surface 26a of the sensor housing 23. The insertion portion 55 is inserted into the opening 26. For this reason, the O-ring 100 may be displaced from the mounting portion 110 in the direction X following the mounting of the sensor body 50. According to the present embodiment, the protrusion 122 serving as the movement suppressing portion 120 for suppressing the O-ring 100 from being displaced from the mounting portion 110 to which the O-ring 100 is mounted is provided. From this, when the sensor body 50 is assembled to the sensor housing 23, even if a force to shift the O-ring 100 from the mounting portion 110 is applied, the O-ring 100 is displaced from the mounting portion 110 by the protrusion 122. Can be suppressed. As a result, it is possible to suppress the deterioration of the sealing property of the portion of the sensor housing 23 where the sensor body 50 is assembled.

(2) When the sensor main body 50 is assembled to the sensor housing 23, even if a force that moves the O-ring 100 from the mounting portion 110 acts, the O-ring 100 is located radially outward of the mounting portion 110. It abuts the protruding protrusion 122. This can prevent the O-ring 100 from being displaced from the mounting portion 110.

The protrusion 122 can be formed by molding contraction when the sensor body 50 is resin-molded. The protrusion 122 has a tapered shape toward the tip, and a recess 121 is formed inside the protrusion 122 in the radial direction. From this, since the wall thickness of the protruding portion 122 is larger toward the base end, the molding shrinkage can be increased. As a result, even if the protrusion 122 is not molded by the first mold 130 so as to protrude radially outward of the mounting portion 110, the protrusion 122 is projected radially outward of the mounting portion 110 by molding contraction. be able to.

(3) When the O-ring 100 is about to shift from the mounting portion 110, the O-ring 100 comes into contact with the protruding portion 122. In this case, since the cross-sectional shape of the tip of the protrusion 122 with which the O-ring 100 abuts is curved, it is possible to prevent the O-ring 100 from being damaged by the surface shape of the protrusion 122.

(4) It is possible to mold the protrusion 122 with a mold, but in this case, the parting line is generally located on the third outer peripheral annular surface 55c in the design of the mold. 3. Burrs are generated on the outer peripheral annular surface 55c. Therefore, the burr generated on the third outer peripheral annular surface 55c may come into contact with the O-ring 100, and the O-ring 100 may be damaged. In this respect, in this embodiment, the parting line is not located on the third outer peripheral annular surface 55c. Therefore, it is possible to both prevent the O-ring 100 from being scratched due to the contact between the O-ring 100 and the burr and the O-ring 100 from being displaced from the mounting portion 110.

<Second Embodiment>
A second embodiment of the torque sensor will be described. Here, the difference from the first embodiment will be mainly described.

As shown in FIG. 5, the movement suppressing portion 120 of the second embodiment is a rough surface 140. The rough surface 140 is formed on the third outer peripheral annular surface 55c. The rough surface 140 does not project radially outward from the mounting portion 110, and the outer diameter of the mounting portion 110 and the outer diameter of the rough surface 140 are set to be substantially equal. The surface roughness of the rough surface 140 is set to be rougher than the surface roughness of the mounting portion 110. The rough surfaces 140 are provided at a plurality of locations on the third outer peripheral annular surface 55c, and are arranged at equal intervals in the circumferential direction. As a result, the frictional force acting between the rough surface 140 and the O-ring 100 when the O-ring 100 contacts the rough surface 140 acts between the O-ring 100 and the mounting portion 110 when the O-ring 100 is mounted. It is larger than the friction force. Such a rough surface 140 can be formed by roughening the surface roughness of the inner surface shape of the first mold 130.

<Third Embodiment>
A third embodiment of the torque sensor will be described. Here, the difference from the first embodiment will be mainly described.

As shown in FIG. 6, the movement suppressing portion 120 of the third embodiment is the protruding portion 150. The projecting portion 150 projects radially outward from the mounting portion 110. The protrusions 150 are provided at a plurality of locations on the third outer peripheral annular surface 55c, and are arranged at equal intervals in the circumferential direction. The protrusion 150 has a hemispherical shape. In the vertical cross section of the sensor body 50, the cross section of the protrusion 150 is semicircular, and the cross section of the tip of the protrusion 150 is curved.

As shown in FIG. 7, the first mold 130 has an inner surface shape for molding the protrusion 150. A recess 132 is provided in a portion of the first die 130 where the third outer peripheral annular surface 55c is molded. The recess 132 is a hemispherical recess. Molten resin is poured into a space formed between the first mold 130 and the second mold 131 to mold the sensor main body 50, and then the first mold 130 and the second mold 131 are separated from each other. Take out 50. In this case, the protrusion 150 of the sensor body 50 that is fitted into the recess 132 of the first mold 130 is so-called forcedly removed. The amount of protrusion of the protrusion 150 toward the outside in the radial direction is set to such a degree that it can be forcibly removed.

<Fourth Embodiment>
A fourth embodiment of the torque sensor will be described. Here, the difference from the first embodiment will be mainly described.

As shown in FIG. 8, a rod-shaped protrusion 160 is formed on the edge of the third outer peripheral annular surface 55c on the sensor housing 23 side and on the outer edge of the fourth outer peripheral annular surface 55d in the radial direction. The movement suppressing unit 120 of the fourth embodiment is the protrusion 160. The projecting portion 160 projects radially outward from the mounting portion 110. A gap is formed between the second inner peripheral annular surface 26b and the fourth outer peripheral annular surface 55d. The projecting portion 160 projects toward the sensor housing 23 side with respect to the fourth outer peripheral annular surface 55d. In the vertical cross section of the sensor body 50, the cross-sectional shape of the tip of the protrusion 160 is curved. The projecting portion 160 projects in a direction intersecting with the third outer peripheral annular surface 55c and the fourth outer peripheral annular surface 55d.

As shown in FIG. 9, the first mold 130 has an inner surface shape for molding the protrusion 160. In the state where the sensor body 50 is housed inside the first mold 130, the protrusion 160 protrudes in the direction X. When the sensor body 50 is housed inside the first mold 130, the outer diameter of the mounting portion 110 and the outer diameter of the protrusion 160 are equal.

After molding the sensor body 50, the first die 130 and the second die 131 are separated from each other and the sensor body 50 is taken out. In this case, since the projecting portion 160 projects in the direction X, the shape of the projecting portion 160 molded when the first mold 130 and the second mold 131 are separated is maintained. By crimping the projecting portion 160 projecting in the direction X with heat, the projecting portion 160 is deformed so as to project in the direction intersecting with the direction X from the state projecting in the direction X. This makes it possible to form the protrusion 160 that protrudes outward in the radial direction from the mounting portion 110.

<Fifth Embodiment>
A fifth embodiment of the torque sensor will be described. Here, the difference from the first embodiment will be mainly described.

As shown in FIG. 10, the movement suppressing portion 120 of the fifth embodiment is a protruding portion 170 that is a member separate from the sensor body 50. The protrusion 170 is formed by fitting a protrusion 172, which is a separate member from the sensor main body 50, into a recess 171 formed on the outer peripheral surface of the third outer peripheral annular surface 55c of the sensor main body 50. As a result, the projecting portion 170 projects radially outward from the mounting portion 110. The recesses 171 are provided at a plurality of locations on the third outer peripheral annular surface 55c and are arranged at equal intervals in the circumferential direction. The recess 171 has a circular shape when viewed from a direction orthogonal to the direction X. The protrusion 172 is a columnar body. In the vertical cross section of the projection 172, that is, in the cross section including the axis thereof, the cross-sectional shape of the tip of the projection 172 is curved.

As shown in FIG. 11, molten resin is poured into a space formed between the first mold 130 and the second mold 131 to mold the sensor main body 50, and then the first mold 130 and the second mold 131. And the sensor body 50 is taken out. The recess 171 is formed on the outer peripheral surface of the third outer peripheral annular surface 55c of the sensor main body 50 molded in this way by cutting or the like, and the protrusion 172 is fitted into the recess 171 to form the protrusion 170. ..

In addition, each embodiment may be modified as follows. In addition, the above embodiments and the following other embodiments can be combined with each other within a technically consistent range.
-In 1st, 2nd, 4th, and 5th Embodiment, in the longitudinal cross section of the sensor main body part 50, the cross-sectional shape of the front-end|tip of each movement suppression part 120 does not need to be curved.

The first outer peripheral annular surface 55a and the third outer peripheral annular surface 55c may have any shape, for example, an elliptical shape, a quadrangle, or a triangle. May be.

In the fifth embodiment, the protrusion 172 used to form the protrusion 170 has a cylindrical body, but the protrusion 172 may have any shape, for example, a quadrangular prism. Good. Further, the recess 171 used to form the protrusion 170 has a circular shape when viewed from the direction orthogonal to the direction X, but may have any shape, for example, a quadrangle shape. May be.

-In 5th Embodiment, although the protrusion part 170 protruded in the radial direction outer side, the angle which the protrusion part 170 and the 3rd outer peripheral annular surface 55c make may be any angle, for example, this angle is an acute angle. May be

The flange 57 may be inserted into the opening 26 in addition to the insertion portion 55, or the flange 57 and the tubular portion 58 may be inserted into the opening 26 in addition to the insertion portion 55. ..

-In 4th Embodiment, the shape of the protrusion part 160 formed by crimping with heat may be what shape, and may be extended in the direction orthogonal to the direction X, for example.
In each of the embodiments, the movement suppressing portions 120 are arranged on the third outer peripheral annular surface 55c at equal intervals in the circumferential direction, but the movement suppressing portions 120 may be arranged over the entire circumference or the movement suppressing portions. The part 120 may be provided only at one location in the circumferential direction.

-In each embodiment, the attachment part 110 and the movement suppression part 120 are provided on the third outer peripheral annular surface 55c, but the present invention is not limited to this. For example, the mounting portion 110 and the movement suppressing portion 120 may be provided on the first inner circumferential annular surface 26a of the sensor housing 23, may be provided on the second inner circumferential annular surface 26b of the sensor housing 23, or the sensor body. It may be provided on the second outer peripheral annular surface 55b of the portion 50. That is, the mounting portion 110 and the movement suppressing portion 120 may be provided on at least one surface forming the annular space in which the O-ring 100 is arranged.

The O-ring 100 is used as the sealing member that seals the part of the sensor housing 23 where the sensor main body 50 is assembled, but is not limited to this. For example, a gasket or packing may be used as the sealing member.

Although the Hall element is used as the magnetic detection element 52, a magnetic resistance element may be used.
The sensor device is embodied as the torque sensor 1 for detecting torque, but may be embodied as a rotation angle detection device for detecting the rotation angle of the steering shaft 2, for example.

DESCRIPTION OF SYMBOLS 1... Torque sensor, 2... Steering shaft, 3... Pinion shaft, 11... Input shaft, 12... Output shaft, 13... Torsion bar, 16... Rack housing, 21... Magnet unit, 22... Magnetic yoke unit, 23... Sensor housing , 26... Opening portion, 26a... First inner circumferential annular surface, 26b... Second inner circumferential annular surface, 26c... Third inner circumferential annular surface, 26d... Groove groove, 27... Fixing portion, 28... Bolt hole, 29 ... fixing part, 30... bolt hole, 31... fixing member, 32... annular magnet, 33... fixing member, 34... yoke holder, 35... first magnetic yoke, 36... second magnetic yoke, 41... first magnetic flux collecting ring, 42... 2nd magnetic flux collecting ring, 50... Sensor main body part, 51... Sensor unit, 52... Magnetic detection element, 53... Circuit member, 53a... Bus bar, 53b... Electronic component, 55... Insert part, 55a... 1st outer periphery ring Surface, 55b... Second outer peripheral annular surface, 55c... Third outer peripheral annular surface, 55d... Fourth outer peripheral annular surface, 55e... Convex ridge portion, 56... Bolt hole, 57... Flange portion, 58... Cylindrical portion, 59... Control device, 60... Bolt, 100... O-ring, 110... Attachment part, 120... Movement suppression part, 121... Recessed part, 122... Projection part, 130... First mold, 131... Second mold, 140... Rough surface , 150, 160, 170... Projection, 171... Recess, 172... Protrusion.

Claims (5)

A sensor housing that accommodates a detection target, a sensor main body that is assembled to the sensor housing and that has a sensor that detects a change in magnetism in the detection target, and is provided between the sensor housing and the sensor main body. In a sensor device including a sealing member for sealing between the members,
The sealing member is arranged in an annular space formed by being partitioned by the sensor housing and the sensor main body, and among the surfaces of the sensor housing and the sensor main body that form the annular space. At least one surface is formed on a mounting portion to which the sealing member is mounted, and on the sensor housing side with respect to the mounting portion, and movement suppression for suppressing the sealing member from shifting from the mounting portion. And a sensor device having a section. The sensor body is configured as a resin molded product,
The sensor device according to claim 1, wherein, on the surface having the attachment portion and the movement restraint portion, the movement restraint portion projects radially outward from the attachment portion. A recess is formed in an end surface of the sensor main body that is connected to the surface having the mounting portion and the movement suppressing portion and that faces the sensor housing,
The movement suppressing portion is provided on the outer side in the radial direction of the recessed portion, and is raised to the outer side in the radial direction with respect to the mounting portion,
The sensor device according to claim 2, wherein the movement suppressing portion has a shape in which a tip thereof is tapered. The sensor device according to claim 2 or 3, wherein a cross-sectional shape of a tip of the movement suppressing portion is curved in a vertical cross section of the sensor body. The sensor device according to any one of claims 1 to 4, wherein a surface roughness of the movement suppressing portion is set to be rougher than a surface roughness of the mounting portion.