JP4916987B2 - Rotation detection sensor - Google Patents

Description

  The present invention relates to a rotation detection sensor used as, for example, an automobile ABS sensor.

  The ABS sensor (axle rotation sensor of anti-lock brake system) used by mounting on a hub bearing of an automobile is provided with a magnet or a metal body on a rotating wheel of the hub bearing, and a magnetic pickup, a hall sensor, an MR sensor, etc. The magnetic sensor is arranged. ABS sensors are required to have mechanical strength, waterproofness, weather resistance, chemical resistance, and the like. Therefore, it is used as a sensor unit structure by overmolding the sensor component with resin or the like.

As a method for overmolding a sensor component, for example, Patent Document 1 proposes a method in which a sensor component is fixed in advance to a sensor fixing holder and is overmolded with a resin.
JP 2000-88984 A

The sensor unit structure for an ABS sensor by the conventional overmolding method has the following problems.
-Since the molding material is a resin, it is not possible to expect adhesion between the built-in product such as a sensor component or a sensor fixing holder and the molding material.
-Due to the self-heating of sensor parts, which are electronic parts, and changes in the environmental temperature, there is a risk of a gap between the built-in product and the mold material, resulting in a problem with waterproofness.
-Even when an external force is applied to the sensor unit structure and plastic deformation occurs in the molding material, there is a problem in waterproofness because a gap is formed between the built-in product and the molding material.
-Since the molding material made of resin has a low deformation capacity, when an external force is applied to the sensor unit structure, the built-in product may be damaged or deformed by the external force acting directly on the built-in product.
・ Since the mold material made of resin has poor vibration absorption, there is a problem in durability against external vibration.
-If an external force is applied that causes the signal cable section that is a signal transmission path from the sensor unit structure to the outside to bend, the external force may be transmitted to the sensor device inside the sensor unit structure, resulting in failure.
A conventional mold by injection molding requires a nozzle that allows molten resin to flow in, a runner that guides the molten resin to a hollow portion that becomes a molded product, and an inlet (gate) to the hollow portion. In order to increase the yield by smoothing the flow of the molten resin through these, the number of manufactured parts at one time is suitably from several to about ten and the number of molded parts at one time is limited.

  As a countermeasure for solving such a problem, a sensor unit includes a sensor element, a cable for taking out an output signal thereof, and a substrate having a conductive portion that electrically connects an electrode portion of the sensor element and a core wire of the cable. Rotation detection that maintains waterproofness and earthquake resistance by fixing this sensor unit to the sensor fixing member and providing a molding part formed by molding a thermoplastic elastomer or rubber material around the sensor unit It is conceivable to manufacture the sensor at a low cost.

  However, in the case of this configuration, since the load applied to the cable is transmitted to the molding part, the molding part and the electrode part may be damaged.

  Moreover, in the said structure, it is possible to provide the clamp part which fixes the said cable to the said sensor fixing member in the location further away from the said molding part.

  However, in the configuration in which the cable is fixed to the sensor fixing member by the clamp portion, a caulking process is required, which increases the number of assembly steps and increases the cost. In addition, the cable may be damaged during caulking.

  The object of the present invention is to suppress cable deflection without caulking the cable, to prevent damage to the molding part due to cable fluctuations even when a load is applied from the outside, and to ensure the reliability of the sensor. It is providing the rotation detection sensor which can be performed.

  A rotation detection sensor according to the present invention is a rotation detection sensor that is fixed to a sensor fixing member that is attached to a wheel bearing and detects the rotation of a rotating wheel of the wheel bearing, and is an annular cover that is provided concentrically with the rotating wheel. A magnetic sensor element for detecting the detection body, a cable for taking out an output signal of the sensor element to the outside, the sensor element and one end of the cable are attached, and the electrode part of the sensor element and the core wire of the cable Are electrically connected to each other to form a sensor unit, the sensor unit is fixed to the sensor fixing member, a molding unit is formed by molding a molding material, covering the sensor unit, and the sensor fixing member A first cable support portion having a support surface having an arcuate cross section for supporting a half of the peripheral surface of a part of the cable at a position away from the molding portion; One or more pairs of cable support portions composed of a combination with a second cable support portion having a support surface having an arc-shaped cross section that supports the peripheral surface half of the other portion of the cable opposite to the peripheral surface half. It is provided.

According to the configuration of the present invention, the following effects can be obtained.
・ Since the sensor unit consisting of sensor parts such as sensor elements, cables, and substrates is molded with an elastic mold material, when the vibration detection or external force acts on the rotation detection sensor, the mold material must absorb the vibration or external force. Thus, it is possible to protect the sensor component by reducing the influence on the sensor component.
・ If the mold material is an elastic thermoplastic elastomer or rubber material, the sensor component and the mold material may experience different thermal expansion and contraction due to changes in the environmental temperature and self-heating of the sensor component, which is an electronic component. However, the difference can be absorbed by the elasticity of the molding material, so that a gap is not generated between the sensor component and the molding material, and the waterproof property can be maintained.
In particular, a first cable support portion having a cross-section arc-shaped support surface that supports a half of the peripheral surface of a portion of the cable at a position away from the molding portion of the sensor fixing member, and the periphery of the other portion of the cable Since one or more pairs of cable support portions are provided which are combined with a second cable support portion having a support surface having an arcuate cross section that supports the half surface of the circumferential surface opposite to the surface half portion. Cable deflection can be suppressed without tightening. Further, even when a load is applied from the outside, the load can be received by the cable support portion, and transmission of the load to the molding portion and the electrode portion of the sensor element can be prevented. As a result, it is possible to prevent damage to the molding part due to cable fluctuations and to ensure the reliability of the rotation detection sensor.

  Each cable support portion of the pair of cable support portions may be a press-molding portion of a plate material. When the cable support portion is formed by molding a plate material, the processing can be easily performed.

When the mold material is a rubber material, the molding can be performed using a mold. In that case, the mold consists of an upper mold and a lower mold, and the sensor unit and the rubber material are put between the upper mold and the lower mold, and pressure is applied between both molds while heating the upper mold and the lower mold. Thus, the molding part may be compression molded.
If molding of the molding part is compression molding using a mold, a large number of rotation detection sensors can be manufactured by one molding, and the cost can be reduced. Further, if the mold is composed of an upper mold and a lower mold, the sensor unit can be easily positioned and an appropriate pressure can be applied to the molding material. Note that a mold by injection molding requires a nozzle that allows molten resin to flow in, a runner that guides the molten resin to a hollow portion that becomes a molded product, and an inlet (gate) to the hollow portion. In order to increase the yield by smoothing the flow of the molten resin passing through these, the number of manufactured parts at one time is appropriate from several to about ten, and the number of molded parts at one time is limited. In contrast, molding by compression molding can produce a large amount of rotation detection sensor by one molding.

When the molding material is a thermoplastic elastomer, the molding can be injection molding using a mold. In that case, the molding unit is injection-molded by placing a sensor unit in the mold and injecting a thermoplastic elastomer into the mold.
Even when the mold material is a rubber material, the molding may be injection molding using a mold. In that case, the molding unit is injection-molded by placing a sensor unit in the mold and injecting a rubber material into the mold.
If the molding part is molded by injection molding, manufacturing is easy and productivity is excellent.

Further, when the mold material is a rubber material, the molding is performed using a mold composed of an upper mold and a lower mold, and the sensor unit and the rubber material are preliminarily attached to either the upper mold or the lower mold. And the molding part may be molded by injection molding a rubber material from the other mold.
When the molding part is molded in this way, in addition to the effects of molding the molding part by the injection molding alone, a sensor unit and a rubber material are put in advance in either the upper mold or the lower mold. As a result, the operational effect that the positioning of the sensor unit is facilitated can be obtained.

  As the sensor element, a Hall element, a magnetoresistive effect element (MR element), a giant magnetoresistive effect element (GMR element), a tunnel magnetoresistive element (TMR element), or a coil can be used. Whichever is used, a good rotation detection sensor is obtained.

The sensor fixing member may be attached to a fixed wheel of a wheel bearing or a peripheral member thereof.
When the sensor fixing member is attached to the fixed wheel of the wheel bearing or its peripheral member, it is not necessary to provide another member for attaching the rotation detection sensor, and the configuration is simplified.

The sensor fixing member may also serve as a cover that covers an end surface of the wheel bearing.
Also in this case, it is not necessary to provide a separate member for attaching the rotation detection sensor, and the configuration is simplified.

  A rotation detection sensor according to the present invention is a rotation detection sensor that is fixed to a sensor fixing member that is attached to a wheel bearing and detects the rotation of a rotating wheel of the wheel bearing, and is an annular cover that is provided concentrically with the rotating wheel. A magnetic sensor element for detecting the detection body, a cable for taking out an output signal of the sensor element to the outside, the sensor element and one end of the cable are attached, and the electrode part of the sensor element and the core wire of the cable The sensor unit is configured with a substrate having a conductive portion that electrically connects to the sensor unit, the sensor unit is fixed to the sensor fixing member, the sensor unit is covered, and a molding portion is formed by molding a molding material. The sensor fixing member has a support surface having an arcuate cross section that supports a half of the peripheral surface of a part of the cable at a position away from the molding part. A cable comprising a combination of a cable support portion of 1 and a second cable support portion having a support surface having an arcuate cross section for supporting a peripheral surface half on the opposite side of the peripheral surface half of the other portion of the cable Since one or more pairs of support parts are provided, cable deflection is suppressed without tightening the cable, and even when a load is applied from the outside, damage to the molding part due to cable fluctuations is prevented, and the reliability of the rotation detection sensor Sex can be secured.

  An embodiment of the present invention will be described with reference to FIGS. In this rotation detection sensor A, a sensor unit B composed of a plurality of sensor components is fixed to a sensor fixing member 7 and a molding portion 8 is provided so as to cover the sensor unit B. This rotation detection sensor A is used in combination with an object to be detected such as a magnetic encoder 45.

  The sensor unit B includes a magnetic sensor element 1, a cable 10 for taking out an output signal of the sensor element 1, and a substrate 11 to which the sensor element 1 and one end of the cable 10 are attached. The substrate 11 has a conductive portion 3 (FIG. 3) formed on the surface of an insulating substrate made of resin or the like by printed wiring or the like. The sensor element 1 is, for example, a Hall element, a magnetoresistive effect element (MR element), a giant magnetoresistive effect element (GMR element), a tunnel magnetoresistive element (TMR element), a coil, or another magnetic sensor element. Consists of. In the case of this embodiment, the cable 10 has two cable core wires 4. Each cable core wire 4 is covered with an insulating coating 5 in an electrically insulated state, and each insulating coating 5 is covered with a cable cover 6. It is supposed to be.

  The sensor element 1 has a pair of electrode portions 2 and 2, each electrode portion 2 is electrically connected to a pair of conductive portions 3 and 3 of the substrate 11, and each cable core wire 4 of the cable 10 is also the above-described one. It is electrically connected to the pair of conductive parts 3 and 3. The conductive part 3 is made of a metal having good electrical conductivity such as copper foil. That is, the electrode part 2 of the sensor element 1 and the core wire 4 of the cable 10 are electrically connected via the conductive part 3 of the substrate 11. The conductive portion 3 is attached to the front surface side (FIG. 3) of the substrate 11, and the sensor element 1 is attached to the back surface side (FIG. 4) of the substrate 11. The electrode portion 2 of the sensor element 1 is It extends through the outside of the substrate 11 from the back side to the front side. Further, a noise preventing capacitor 12 is mounted on the surface of the substrate 11 so as to be electrically connected across the pair of conductive portions 3 and 3. Here, since the capacitor 12 is of a surface mount type as shown in FIG. 3, the sensor unit B can be made compact. It is desirable to process both the front and back surfaces of the substrate 11 into a rough surface in order to enhance the adhesiveness with the molding material to be the molding portion 8. The electrode part 2 and the conductive part 3 are electrically connected by pressure bonding, soldering, thermocompression bonding, or other joining methods. The cable core 4 and the conductive portion 3 are electrically connected by crimping, soldering, or other joining methods.

  The sensor fixing member 7 also serves as a cover for covering the end face of the wheel bearing (see FIGS. 9 and 10), and is an annular metal product centered on the central axis of the wheel bearing. The sensor fixing member 7 includes a stepped cylindrical portion 7a having a large diameter portion 7aa and a small diameter portion 7ab, and a flange portion 7b extending from the edge of the small diameter portion 7ab of the cylindrical portion 7a toward the inner diameter side. As shown in FIG. 3, the sensor unit B is fixed to the sensor fixing member 7 by fixing the substrate 11 to the flange portion 7 b of the sensor fixing member 7 by the fixing tool 13. An opening 7 c is formed in the flange portion 7 b, and the sensor element 1 protrudes through the opening 7 c to the side opposite to the fixed surface of the substrate 11. Various fixtures such as pins, screws, rivets and the like can be used.

The cable 10 drawn from the molding part 8 is wired on the flange part 7b of the sensor fixing member 7 in the circumferential direction. FIG. 2 is a side view of the cable 10 wired along the flange portion 7b of the sensor fixing member 7 as viewed from the direction of arrows II-II in FIG. As shown in FIGS. 1 (A), (C), (D), the two cable support portions 15, 16 are located at positions away from the molding portion 8 of the flange portion 7 b of the sensor fixing member 7 in the circumferential direction. A cable support portion pair 14 formed of a combination is provided. As shown in FIG. 1C, the first cable support portion 15 has a support surface 15a formed in a circular arc shape that opens toward the side opposite to the direction in which the cylindrical portion 7a of the sensor fixing member 7 projects. And supporting a half of the peripheral surface of the cable 10 in the vicinity of the molding part 8. As shown in FIG. 1 (D), the second cable support portion 16 has a support surface 16a formed in a cross-sectional arc shape that opens in a direction opposite to the first cable support portion 15, A peripheral half of the cable 10 that is opposite to the peripheral half of the peripheral portion of the cable 10 is supported by the first cable support 15 in the circumferential direction.
Here, the cable support portions 15 and 16 are integrally formed with the sensor fixing member 7 by press-molding the flange portion 7b of the sensor fixing member 7 which is a plate material. Note that the wiring portion of the cable 10 in the flange portion 7 b of the sensor fixing member 7 is formed with a window 17 along the cable 10 except for the installation portion of the first cable support portion 15. 10 faces both the front and back surfaces of the flange 7b. In addition, each cable support part 15 and 16 may be continuously arrange | positioned in the circumferential direction without a window.

  In this embodiment, the case where one pair of the cable support part pairs 14 is provided is shown, but a plurality of pairs may be provided. The cable support portion pair 14 is integrated with the sensor fixing member 7, but may be a separate member.

  The molding material used for the mold of the sensor unit B is made of a material having rubber elasticity, and a rubber material or a thermoplastic elastomer is suitable. As the rubber material, nitrile rubber or fluororubber is desirable. These are excellent in heat resistance, low temperature characteristics, and oil resistance. Rubber materials other than the above may be used. As the thermoplastic elastomer, vinyl chloride, ester and amide are desirable. These are excellent in heat resistance and oil resistance.

  When the mold material is a rubber material, the molding of the mold material can be compression molding using a mold. For example, as shown in FIG. 5A, the compression molding using a mold is performed between a sensor unit B, a sensor fixing member 7 (not shown), and a mold material 22 between an upper mold 20 and a lower mold 21 which are molds. Then, as shown in FIG. 5B, the upper mold 20 and the lower mold 21 are heated and pressure is applied between both molds. Since the substrate 11 is fixed to the sensor fixing member 7, the position of the sensor unit B does not move due to the internal pressure in the molds 20 and 21 during compression molding, and the sensor unit B can be easily positioned. Further, when the mold is composed of the upper mold 20 and the lower mold 21, the positioning of the sensor unit B is easy, and an appropriate pressure can be applied to the molding material. Furthermore, if molding of the molding part 8 is compression molding using a mold, a large amount of rotation detection sensor A can be manufactured by one molding, and the cost can be reduced.

  When the molding material is a thermoplastic elastomer, the molding of the molding material is preferably injection molding using a mold. In injection molding using a mold, for example, as shown in FIG. 6A, a sensor unit B and a sensor fixing member 7 (not shown) are placed in molds 20 and 21 that can be divided. By injecting the molding material 22 into the molds 20 and 21 through the molding material injection hole 23, the molding material 22 is molded as shown in FIG. In FIG. 2A, the sensor unit B is fixed at a predetermined position by a sensor fixing member 7 (not shown). When the mold material is a rubber material, it can be similarly molded by injection molding. This injection molding is easy to manufacture and has excellent productivity.

  When the molding material is a rubber material, the molding material may be molded by the method shown in FIG. That is, a mold composed of an upper mold 20 and a lower mold 21 is used, and a sensor unit B is previously placed in either the upper mold or the lower mold (the lower mold 21 in the illustrated example) as shown in FIG. Then, the sensor fixing member 7 (not shown) and the mold material 22 are inserted, and the mold material 22 is inserted from the mold material injection hole 23 of the other mold (the upper mold 20 in the illustrated example) as shown in FIG. Is injected into the molds 20 and 21, and the molding material 22 is injection molded. When the molding part 8 is molded in this way, in addition to the operational effects of molding by the injection molding alone, the sensor unit B and the molding material 22 are put in the lower mold 21 in advance, thereby positioning the sensor unit B. The effect that it becomes easy is obtained.

Further, when the molding material is a rubber material, the molding material may be molded by pot type transfer molding using a mold as shown in FIG. In this case, the upper mold 20 and the lower mold 21 which are molds are used similarly to the compression molding of FIG. The lower mold 21 has an upper pot 27 serving as a heating chamber and a lower cavity 28 serving as a mold clamping space, and the pot 27 and the cavity 28 communicate with each other through a molding material injection hole 29. As shown in FIG. 8A, the sensor unit B and the sensor fixing member 7 (not shown) are placed in the cavity 28, and the tablet-shaped molding material 22 is placed in the pot 27. Next, after preheating the mold material 22 to near the molten state, the upper mold 20 is pushed into the pot 27 of the lower mold 21 and the molten mold material 22 is inserted into the mold material injection hole as shown in FIG. It is molded by being injected into the cavity 28 through 29.
Also in this case, since the substrate 11 is fixed to the sensor fixing member 7, the position of the sensor unit B does not move during molding, and the sensor unit B can be easily positioned. In addition, if the molding of the molding part 8 is a pot type transfer molding using a mold, a large amount of the rotation detection sensor A can be manufactured by one molding, and the cost can be reduced.

  In the rotation detection sensor A having the above-described configuration, since the sensor unit B is molded with the molding material 22 made of an elastic rubber material or thermoplastic elastomer, when vibration or external force is applied to the rotation detection sensor A, the vibration or external force is detected. Since the molding part 8 absorbs the influence of the sensor unit B on each sensor part, the sensor part can be protected. Further, since the molding part 8 is made of an elastic rubber material or thermoplastic elastomer, the sensor part and the molding part 8 have different thermal expansion / contraction due to changes in environmental temperature and self-heating of the sensor part which is an electronic part. Even in the case of occurrence of such a phenomenon, the difference can be absorbed by the elasticity of the molding portion 8, and a gap can be prevented from being generated between the sensor component and the molding portion 8, and waterproofness can be maintained.

  In particular, the first cable support portion 15 having a cross-sectional arc-shaped support surface that supports a part of the peripheral surface half of the cable 10 at a position away from the molding portion 8 of the sensor fixing member 7, and the cable 10. One or more pairs of cable support portions 14 each including a combination with a second cable support portion 16 having a support surface having an arcuate cross section for supporting a half portion of the peripheral surface opposite to the half portion of the peripheral surface is provided. Therefore, the bending of the cable 10 can be suppressed without caulking the cable 10. Further, even when a load is applied from the outside, the load can be received by the cable support portions 15 and 16, so that the load can be prevented from being transmitted to the molding portion 8 and the electrode portion 2 of the sensor element 1. As a result, it is possible to prevent the molding portion 8 from being damaged due to fluctuations in the cable 10 and to ensure the reliability of the rotation detection sensor A.

  Moreover, in this embodiment, since each cable support part 15 and 16 of the cable support part pair 14 is a thing formed by press-molding the collar part 7b in the sensor fixing member 7 which is a board | plate material, the process is easy. is there.

  In this embodiment, since the sensor fixing member 7 also serves as a cover for the wheel bearing, the rotation detection sensor A can be easily positioned and the number of parts can be reduced. Further, since the sensor fixing member 7 is made of metal, when the molding material is a rubber material, the adhesiveness between the sensor fixing member 7 and the molding portion 8 is good, and the rotation detection sensor A as a whole has a strong structure. be able to.

  9 and 10 show a wheel bearing device provided with the rotation detection sensor of the present invention. As shown in a sectional view in FIG. 9, this wheel bearing device is obtained by attaching a rotation detection sensor / fixing member mounting body C in which a rotation detection sensor A is fixed to a sensor fixing member 7 to a bearing portion 30. In the following description, the side closer to the outer side in the vehicle width direction of the vehicle when attached to the vehicle is referred to as the outboard side, and the side closer to the center of the vehicle is referred to as the inboard side.

  The bearing portion 30 includes an outer member 31 in which a double row rolling surface 33 is formed on the inner periphery, an inner member 32 in which a rolling surface 34 that faces each of the rolling surfaces 33 is formed, and these outer members. 31 and a double row rolling element 35 interposed between the rolling surfaces 33 and 34 of the inner member 32. The rolling elements 35 in each row are held by a holder 36. Both ends of the bearing space between the outer member 31 and the inner member 32 are sealed by sealing devices 37 and 38, respectively.

  The outer member 31 is a fixed wheel, is an integral part, and is provided with a flange 31a on the outer periphery for attachment to a knuckle (not shown) extending from the suspension device of the vehicle body. The inner member 32 is a rotating wheel, and includes a hub wheel 39 having a wheel mounting flange 39a on the outboard side, and an inner ring 40 fitted to the outer periphery of the inboard side end of the hub wheel 39. Become. The hub ring 39 and the inner ring 40 are formed with the rolling surfaces 34 of the respective rows. The inner member 32 has an axial through hole 41 at the center, and a stem portion (not shown) of one joint member of the constant velocity joint is inserted into the through hole 41.

  In the sealing device 38 on the inboard side of the sealing devices 37 and 38, a magnetic encoder 45 as a detection object is incorporated. The magnetic encoder 45 is provided with a multipolar magnet 45b on a side plate portion of a ring member 45a having an L-shaped cross section. The ring member 45a includes a cylindrical portion that is attached to the outer periphery of the inner ring 40 by press fitting, and the side plate portion that extends from the inboard side end of the cylindrical portion to the outer diameter side. The multipolar magnet 45b is a member formed with alternating magnetic poles N and S in the circumferential direction, and is made of a rubber magnet, a plastic magnet, a sintered magnet, or the like. In this embodiment, the magnetic encoder 45 also serves as a component of the inboard side sealing device 38 and functions as a slinger.

The sensor fixing member 7 is configured such that the cylindrical portion large diameter portion 7aa is fitted to the outer peripheral surface inboard side of the outer member 31, and the step surface of the cylindrical portion large diameter portion 7aa and the small diameter portion 7ab is provided on the outer member 31. It is attached to the outer member 31 in contact with the end face on the inboard side. The sensor fixing member 7 also serves as a cover for the end face on the inboard side of the wheel bearing. In a state where the sensor fixing member 7 is attached, the rotation detection sensor A is positioned facing the magnetic encoder 45.
When the inner member 32, which is a rotating wheel, rotates, the sensor element 1 detects the magnetic poles N and S of the magnetic encoder 45 that rotates with the inner member 32. The detection signal is transmitted to the automobile electric control unit (not shown) via the cable 10, and the rotation speed is calculated from the detection signal of the sensor element 1 by the electric control unit.

The rotation detection sensor A of this embodiment is of a type opposed to the magnetic encoder 45 in the axial direction, but the present invention can also be applied to a type opposed to the magnetic encoder 45 in the radial direction. . Instead of the magnetic encoder 45, a pulse coder made of a gear-shaped magnetic material or the like may be used as the detected object.
In addition, the magnetic encoder 45 or the pulse coder as a detected object may be attached to a vehicle wheel.
Furthermore, in this embodiment, the sensor fixing member 7 is directly attached to the fixed wheel, but may be attached to the fixed wheel via another member.

(A) is a front view of a rotation detection sensor according to an embodiment of the present invention, (B) is a cross-sectional view taken along arrow IB-IB, (C) is a cross-sectional view taken along arrow IC-O, and (D) is ID-O. It is arrow sectional drawing. It is the side view seen from the II-II arrow direction in FIG. It is the III section enlarged view of FIG. 1 (A). It is a back surface enlarged view of the III section of Drawing 1 (A). It is explanatory drawing which shows the shaping | molding method of a mold material. It is explanatory drawing which shows the shaping | molding method of a different mold material. Furthermore, it is explanatory drawing which shows the shaping | molding method of a different mold material. Furthermore, it is explanatory drawing which shows the shaping | molding method of a different mold material. It is sectional drawing of the wheel bearing apparatus which provided the rotation detection sensor of this invention. It is the front view which looked at the same bearing device from the inboard side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Sensor element 2 ... Electrode part 3 ... Conductive part 4 ... Cable core wire 7 ... Sensor fixing member 8 ... Molding part 10 ... Cable 11 ... Board | substrate 14 ... Cable support part pair 15 ... 1st cable support part 15a ... Support surface 16 ... second cable support 16a ... support surface 20 ... upper mold (mold)
21 ... Lower mold (mold)
22 ... Mold material 45 ... Magnetic encoder (detected body)
A ... Rotation detection sensor B ... Sensor unit

Claims (9)

  A rotation detection sensor which is fixed to a sensor fixing member attached to a wheel bearing and detects the rotation of a rotating wheel of the wheel bearing, and is a magnetic sensor which detects an annular detection object provided concentrically with the rotating wheel. A sensor element, a cable for taking out an output signal of the sensor element to the outside, a conductive element for attaching the sensor element and one end of the cable, and electrically connecting the electrode part of the sensor element and the core wire of the cable A sensor unit is configured with a substrate having a portion, the sensor unit is fixed to the sensor fixing member, a molding portion formed by molding a molding material is provided to cover the sensor unit, and the molding portion of the sensor fixing member A first cable support portion having a support surface having an arcuate cross section for supporting a half of the peripheral surface of a part of the cable at a position away from the cable, One or more pairs of cable support portions are provided that are combined with a second cable support portion having a support surface having an arcuate cross section that supports the half surface of the other side of the cable opposite to the half surface. A rotation detection sensor characterized by that.   The rotation detection sensor according to claim 1, wherein each cable support portion of the pair of cable support portions includes a press forming portion of a plate material.   3. The molding according to claim 1, wherein the molding is performed using a mold, and the mold includes an upper mold and a lower mold, and the mold includes the sensor unit and a rubber material between the upper mold and the lower mold. A rotation detection sensor in which the molding part is compression-molded by putting a material and applying pressure between both molds while heating the upper mold and the lower mold.   3. The molding according to claim 1, wherein the molding is injection molding using a mold, and the molding unit is injection molded by inserting a sensor unit into the mold and injecting a thermoplastic elastomer into the mold. Rotation detection sensor.   3. The molding according to claim 1, wherein the molding is injection molding using a mold, and the molding part is injection molded by placing a sensor unit in the mold and injecting a rubber material into the mold. Rotation detection sensor.   3. The molding according to claim 1, wherein the molding is performed using a mold composed of an upper mold and a lower mold, and a rubber material is previously placed in one of the upper mold and the lower mold, and the other mold is used. A rotation detection sensor formed by molding the molding part by injection molding a rubber material.   7. The rotation detection sensor according to claim 1, wherein the sensor element comprises a Hall element, a magnetoresistive effect element, a giant magnetoresistive effect element, a tunnel magnetoresistive element, or a coil.   8. The rotation detection sensor according to claim 1, wherein the sensor fixing member is attached to a fixed wheel of a wheel bearing or a peripheral member thereof.   9. The rotation detection sensor according to claim 1, wherein the sensor fixing member also serves as a cover that covers an end surface of the wheel bearing.

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