JP5137502B2 - Method for manufacturing rotation detection device - Google Patents

Description

The present invention, for example, about the rotation detection equipment manufacturing how to be applied to a anti-lock braking system (ABS) sensor for automobiles.

  A technique for manufacturing a sensor and peripheral parts by resin overmolding (insert molding) has been put to practical use (see Patent Document 1). In an axle rotation sensor (ABS sensor) used for mounting on a hub bearing of an automobile, a magnet body or a metal body is disposed on a rotating wheel of the hub bearing, and a magnetic type such as a magnetic pickup, a hall sensor, or a magnetoresistive element is opposed thereto. It is the structure which arrange | positions a sensor. The ABS sensor is used as a sensor unit structure by overmolding sensor components.

  In the prior art, a sensor component is fixed in advance to a sensor holder for fixing a sensor, and resin is overmolded (secondary molding). In automobile parts, performances such as mechanical strength, waterproofness, weather resistance, chemical resistance and the like are required, and such a mold is required.

JP 2000-88984 A

The prior art has the following problems.
(1) Adhesiveness between the molding material and the component to be incorporated cannot be expected.
(2) Due to the self-heating of the built-in electronic component and the change in the environmental temperature, a gap is generated between the mold material and the built-in component due to a difference in thermal expansion, and there is a problem in waterproofness.
(3) Even when an external force is applied to the molded sensor unit and plastic deformation occurs in the molding material, a gap is generated between the molding material and the built-in component, and there is a problem in waterproofness.
(4) When an external force is applied to the molded sensor unit, the molding material made of resin is unlikely to be deformed. Therefore, a force acts directly on the built-in components, causing damage to the sensor unit.
(5) The mold material made of resin does not have vibration absorption performance and has a problem in durability against external vibration.
(6) The mold by the conventional 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 smooth the flow of the molten resin and increase the yield, it is appropriate that the number of production at one time is several to about 10, and the number of molding at one time is limited.

  In rotation detection devices such as ABS sensors that are mounted on automobile parts, especially in hub bearings, they are exposed to the road surface and exposed to salty mud water, and in severe environments where a large temperature change from tens to minus tens of degrees occurs. In addition, it is located below the suspension and is greatly affected by vibrations caused by vehicle travel. The malfunction of the ABS sensor has a great influence on the safety of vehicle travel. Therefore, it is necessary to avoid as much as possible the deterioration of waterproofness due to the adhesiveness between the molding material and the built-in parts, the difference in thermal expansion, the generation of gaps due to external force, etc. It is strongly desired that the property be excellent. Such various severe demands cannot be satisfied by a conventional rotation detection device using a resin mold.

The object of the present invention is to absorb the difference in thermal expansion due to the environmental temperature and self-heating of the sensor parts, and to be excellent in waterproofness, and even when vibration or external force is applied, damage to the sensor parts can be avoided and excellent in durability. and to provide a method of manufacturing a rotation detecting equipment which can reduce the manufacturing cost.
Another object of the present invention is to absorb the difference in thermal expansion due to environmental temperature and self-heating of the sensor parts, and is excellent in waterproofness, and even when vibration or external force is applied, damage to the sensor parts can be avoided and durability It is an object to provide a wheel bearing with a rotation detection device that is excellent in performance and can reduce manufacturing costs.

Rotation detecting device includes a magnetic sensor disposed to face the magnet body or a metal body provided member that rotates, and peripheral components that are electrically or mechanically connected to the magnetic sensor, the The magnetic sensor and the peripheral parts are formed by covering them with a thermoplastic elastomer or a material exhibiting rubber elasticity.

  According to this configuration, the magnetic sensor and peripheral parts (these are called sensor parts) are molded in a state of being covered with a thermoplastic elastomer or a material exhibiting rubber elasticity, so that when vibration or external force is applied to the sensor parts, However, the molding material having rubber elasticity is deformed, and it is possible to prevent problems such as breakage of sensor parts. Even if the sensor component is covered with an elastomer or rubber material that has elasticity, the sensor component and the molding material may experience different thermal expansion due to environmental temperature and self-heating of the electronic component. The elasticity of the material absorbs the difference in thermal expansion. Therefore, it is possible to prevent water or the like from entering between the sensor component and the molding material, and the waterproofness of the sensor component can be maintained.

Before Symbol molding, it is preferred by compression molding using a mold. According to this configuration, since a large number of rotation detection devices can be manufactured by a single molding, the number of sensor parts manufactured per unit time is increased from that of the prior art in which injection molding is performed, thereby reducing the manufacturing cost. be able to.

Before Symbol magnetic sensor is preferably a Hall sensor, a magneto-resistive element or a giant magnetoresistive element. In the present invention, the magnetic sensor may be a magnetic sensor composed of a coil. The front Symbol magnetic sensor is constituted by a magnetic detecting element which is allowed to a plurality of aligned, based on the internal signal generated by calculating the outputs of the plurality of magnetic detection elements, multiplication number of predetermined It may generate output. The magnetic sensor is preferably configured to be attachable to a wheel bearing device of an automobile. According to this configuration, it is possible to realize an automobile part having performances such as mechanical strength, waterproofness, weather resistance, and chemical resistance.

  The method of manufacturing a rotation detecting device according to the present invention includes a magnetic sensor to be disposed opposite to a magnet body or a metal body provided on a rotating member, and an electrical or mechanical connection to the magnetic sensor. And a peripheral part to be compressed together with a thermoplastic elastomer or a material exhibiting rubber elasticity by a mold.

  According to this manufacturing method, since the sensor component is compression-molded by a mold together with a thermoplastic elastomer or a material exhibiting rubber elasticity, even if vibration or external force is applied to the sensor component, problems such as breakage are prevented. This can increase the durability of the sensor component. Even if the sensor component and the molding material are subjected to compression molding, especially with an elastomer material or rubber material having elasticity, even if the thermal expansion differs between the sensor component and the molding material due to the environmental temperature and the self-heating of the electronic component, The difference in thermal expansion can be absorbed by the elasticity of the material. Therefore, it is possible to prevent water or the like from entering between the sensor component and the molding material, and the waterproofness of the sensor component can be maintained. Since the molding is mold compression molding, a large amount of rotation detection device can be manufactured by one molding. Therefore, according to this manufacturing method, the manufacturing cost can be reduced as compared with the prior art of injection molding.

Before comprises Kikin type upper and lower molds, said step, the upper die, between the lower mold, the magnetic sensor, comprising the steps of sandwiching interposed peripheral components, and the rubber material mixed with vulcanizing agent And a step of heating at least one of the upper die and the lower die, and a step of applying pressure between the upper die and the lower die after the step.

  According to this manufacturing method, first, a rubber material mixed with a magnetic sensor, peripheral components, and a vulcanizing agent is interposed between an upper mold and a lower mold. Next, at least one of the upper mold and the lower mold is heated to soften the rubber material. After that, since pressure is applied between the upper mold and the lower mold, it is possible to prevent the magnetic sensor and peripheral parts from being pressed and damaged by hard rubber.

This rotation detector equipped wheel support bearing, the outer member rolling run surfaces of the double row is formed on the inner periphery, the inner member rolling run surface formed on the outer periphery opposite to the rolling surfaces And a double-row rolling element interposed between the opposing rolling surfaces, and a wheel bearing for rotatably supporting a wheel with respect to a vehicle body, wherein the outer member and the inner member are fixed. The rotation detection device having any one of the above-described configurations of the present invention is attached to the side member. The magnet body or metal body facing the magnetic sensor of the rotation detection device is attached to a rotation-side member of the outer member and the inner member.
The wheel bearing is used in a severe environment such as being exposed to the road surface as described above and exposed to a large temperature change or salt mud water. According to the wheel bearing with a rotation detection device having the above-described configuration, the above-described effects of the rotation detection device of the present invention are effectively exerted, and the thermal expansion difference due to the environmental temperature and the self-heating of the sensor component can be absorbed, thereby being waterproof. It is excellent, and even when vibration or external force is applied, damage to the sensor component can be avoided, the durability is excellent, and the manufacturing cost can be reduced.

Rotation detection device, a sensor component, so formed by molding in a state covered with a material showing a thermoplastic elastomer or rubber elastic, vibration sensor component, even if an external force acts, the molding material having rubber elasticity is deformed In addition, problems such as breakage of sensor parts can be prevented. Even when different thermal expansion occurs between the sensor component and the molding material due to the environmental temperature and self-heating of the electronic component, the thermal expansion difference can be absorbed by the elasticity of the molding material. Therefore, an undesired gap can be prevented from being generated between the sensor component and the molding material, and the waterproofness of the sensor component can be maintained. Since the molding can be compression molding using a mold, a large number of rotation detection devices can be manufactured by one molding .
The method of manufacturing a rotation detecting device according to the present invention includes a magnetic sensor to be disposed opposite to a magnet body or a metal body provided on a rotating member, and an electrical or mechanical connection to the magnetic sensor. And a peripheral part to be molded together with a thermoplastic elastomer or a material exhibiting rubber elasticity by a mold, and the mold includes an upper mold and a lower mold, and the process includes between the upper mold and the lower mold. A step of sandwiching a rubber material mixed with the magnetic sensor, peripheral components, and a vulcanizing agent, a step of heating at least one of the upper die and the lower die, and after the step, Applying pressure between the upper mold and the lower mold. For this reason, it can absorb the difference in thermal expansion due to environmental temperature and self-heating of sensor parts, and is excellent in waterproofness. Also, it can avoid damage to sensor parts even when vibration or external force is applied, and has excellent durability. A rotation detection device capable of reducing the cost can be manufactured.
Since rotation detector equipped wheel support bearing, in which a rotation detecting device of the present invention, the above effects in the rotation detecting device of the present invention is effectively exhibited, the thermal expansion difference due to self-heating of the environmental temperature and sensor components Absorption, excellent waterproofness, and even when vibration or external force is applied, sensor parts can be prevented from being damaged, have excellent durability, and can reduce production costs.

  Hereinafter, a plurality of embodiments for carrying out the present invention will be described with reference to the drawings. In the following description, the same reference numerals are given to portions corresponding to the matters described in the preceding forms in each embodiment, and overlapping description may be omitted. When only a part of the configuration is described, the other parts of the configuration are the same as those described in the preceding section. Not only the combination of the parts specifically described in each embodiment, but also the embodiments can be partially combined as long as the combination does not hinder.

Rotation detecting device manufactured by the manufacturing method of the rotation detection equipment according to the present embodiment, for example, is applied to a anti-lock braking system (ABS) sensor for automobiles. However, the present invention is not necessarily limited to automobiles, and can be applied to various vehicles such as two-wheeled vehicles, railway vehicles, and transport vehicles, and can be attached to various bearings and peripheral members of the bearings. The following description also includes a description of a method for manufacturing the rotation detection device.

FIG. 1 is a cross-sectional view of a rotation detection device according to a reference proposal example . The rotation detection device 1 includes a sensor assembly 3 and an elastic member 11 </ b> A that covers a main part of the sensor assembly 3. The sensor assembly 3 includes a sensor 4 that is a magnetic sensor, an electrode terminal 5, a cable core wire 6, a cable insulation coating 7, and a cable cover 8. The sensor 4 is realized by a magnetic sensor including a Hall sensor, a magnetoresistive element (MR sensor, MR: MagnetoResistance), a giant magnetoresistive element (GMR sensor, GMR: Giant Magneto Resist), or a coil. The sensor 4 is composed of a plurality of aligned magnetic detection elements, and outputs a predetermined multiplication number based on an internal signal generated by calculating the outputs of the plurality of magnetic detection elements. It may be generated. By using a sensor having a multiplication function, it is possible to obtain a rotation detection resolution several to several tens of times that of a pattern formed on a magnetic encoder or the like to be detected.

The front end 4a of the sensor 4 is disposed at a predetermined small distance from the magnet or metal body provided on a rotating member (not shown). The magnet body is, for example, a magnetic encoder magnetized alternately in the circumferential direction. The metal body is, for example, a gear-shaped pulsar ring. An electric terminal 4b is attached to the base end portion of the sensor 4, and an electrode terminal 5 made of a metal having good electrical conductivity is electrically connected to the electric terminal 4b by crimping, soldering or other joining methods. ing. The extending direction of these electric terminals 4b and electrode terminals 5 is defined as the y direction, and the thickness direction of the electrode terminals 5 is defined as the z direction. The direction orthogonal to the y and z directions is defined as the x direction. In each figure, the x, y, and z directions are represented by arrows x, y, and z.

  The cable core wire 6 is electrically connected to the tip end portion of the electrode terminal 5 in the y direction by crimping, soldering, or other joining method, and a cable insulation coating 7 is provided to ensure electrical insulation of the cable core wire 6. Yes. Further, a cable cover 8 that covers the outside of the cable insulation coating 7 is provided. The electrode terminal 5 excluding the sensor 4, the cable core wire 6, the cable insulation coating 7, and the cable cover 8 correspond to peripheral components.

  The elastic member 11A is made of, for example, a rubber material 11 mixed with a vulcanizing agent and exhibiting rubber elasticity. The elastic member 11 </ b> A covers the sensor 4, the electrode terminal 5, the cable core wire 6, and the entire cable insulation coating 7 in a close contact state without a gap. Furthermore, the elastic member 11 </ b> A is configured to cover most of the cable cover 8 except for one end in the y direction in a tight contact state.

  For the rubber material 11, for example, nitrile rubber and fluororubber are preferable because they are excellent in heat resistance, low temperature characteristics and oil resistance, but other rubber materials may be used. Instead of these rubber materials, thermoplastic elastomers may be used. Of these, vinyl chloride, ester, and amide are particularly preferable because of their excellent heat resistance and oil resistance. In any case, the material for molding the sensor assembly 3 may be a material exhibiting rubber elasticity, and is a mold compression molding described later shown in FIGS. 3 and 4.

  2A and 2B are diagrams of the sensor assembly, FIG. 2A is a cross-sectional view of the sensor assembly, and FIG. 2B is a plan view of the sensor assembly. FIG. 3 is a cross-sectional view illustrating a stage before compression molding using an upper mold, a lower mold, a rubber material, and a sensor assembly mold. FIG. 4 is a cross-sectional view illustrating a state in which a sensor assembly and a rubber material are interposed between an upper mold and a lower mold. This will be described with reference to FIG.

  The above-described sensor assembly 3 is sandwiched and molded with a rubber material 11 mixed with a vulcanizing agent by a mold 2 including an upper mold 9 and a lower mold 10. That is, as shown in FIG. 3, the sensor assembly 3 is sandwiched between the upper mold 9 and the lower mold 10 together with the rubber material 11 mixed with a vulcanizing agent, and the sensor assembly 3 is connected by the upper mold 9 and the lower mold 10 as shown in FIG. The upper die 9 and the lower die 10 are heated for a predetermined time with the pressure between the sensor assembly 3 and the like, and the compression molding is performed.

  In this case, if pressure is applied to the sensor assembly 3 or the like before heating, the electronic components including the sensor 4 may be damaged. Therefore, it is desirable to pressurize the rubber material 11 in a softened state by heating in advance. In other words, in the present embodiment, in the mold molding process, the upper mold 9 and the lower mold 10 are heated to soften the rubber material 11, and then pressure is applied between the upper mold 9 and the lower mold 10. Therefore, it is possible to prevent the electronic component including the sensor 4 from being pressed and damaged by the hard rubber.

  The applicable mold is not limited to a mold composed of an upper mold and a lower mold, and a mold including an upper mold and a lower mold is sufficient. In the present embodiment, the upper mold 9 and the lower mold 10 are heated for a certain period of time. However, depending on the ambient temperature, the elapsed time from the end of the previous heating, etc., only one of the upper mold 9 and the lower mold 10 is used. May be heated for a certain period of time. The heating time of the mold 2 is not limited to a continuous constant time, and can be intermittently performed.

  Further, since only a predetermined volume is formed between the upper mold 9 and the lower mold 10, a nest is generated inside the elastic member if the amount of the rubber material is small, or conversely if the rubber material is too large, the rubber material is contained in the mold 2. There is a possibility that it can not be molded well. Therefore, it is desirable to form a gap δ (see FIG. 4) through which excess rubber material 11 flows out of the mold 2 when pressure is applied to the sensor assembly 3 or the like to be pressurized.

  In the present embodiment, the upper mold 9 and the lower mold 10 are configured so that a predetermined minute gap δ is formed between the upper mold 9 and the lower mold 10 in a state where pressure is applied to a predetermined pressurization target. As a result, the excess rubber material 11 can smoothly flow out of the mold 2 when pressure is applied to the sensor assembly 3 or the like that is the object of pressurization. Therefore, it is possible to prevent the formation of a nest inside the elastic member due to the small amount of the rubber material 11. On the contrary, it is possible to prevent a problem that the rubber material 11 does not fit in the mold 2 and cannot be molded well due to the excessive amount of the rubber material 11.

According to the manufacturing method of the rotation detection device 1 according to the first embodiment described above, the sensor assembly 3 is molded from the thermoplastic elastomer or the material 11 exhibiting rubber elasticity, so that the durability of the sensor assembly 3 is enhanced. Can do. Even when vibration or external force is applied to the sensor assembly 3, problems such as breakage can be prevented. Even when different thermal expansion occurs between the sensor assembly 3 and the elastic member 11A that is the molding material due to the environmental temperature and the self-heating of the electronic component, the difference in thermal expansion can be absorbed by the elasticity of the elastic member 11A. . Therefore, it is possible to prevent an undesired gap from being generated between the sensor assembly 3 and the elastic member 11 </ b> A, and the waterproofness of the sensor assembly 3 can be maintained. Since the molding is compression molding using a mold, a large amount of rotation detection device 1 can be manufactured by one molding. Therefore, it is possible to reduce the manufacturing cost of the rotation detection device 1 per unit time as compared with the prior art in which injection molding is performed.

  According to the method for manufacturing the rotation detecting device 1 described above, after the sensor assembly 3 and the rubber material 11 are interposed between the upper die 9 and the lower die 10, the upper die 9 and the lower die 10 are heated at a predetermined temperature. Since the rubber material 11 is softened and then pressure is applied between the upper die 9 and the lower die 10, the electronic component including the sensor 4 is pressed against the hard rubber (before softening) and is damaged. It can be prevented in advance. Since the upper mold 9 and the lower mold 10 are configured so that a predetermined minute gap δ is formed between the upper mold 9 and the lower mold 10 in a state where pressure is applied to the pressurizing target, the sensor assembly 3 or the like that is the pressurizing target The excess rubber material 11 can be smoothly flowed out of the mold 2 at a stage where pressure is applied to the mold 2.

5 through 12 are sectional views showing an example of a wheel support bearing assembly equipped with upper Machinery rolling detector 1. First, a configuration common to these examples will be described, and thereafter, different portions of each example will be described individually. The wheel bearing is attached to a vehicle such as an automobile. In this specification, the side closer to the outer side in the vehicle width direction when attached to the vehicle is called the outboard side, This is called the inboard side which is the center side.

These wheel bearings interpose a double-row rolling element 53 between an outer member 51 and an inner member 52 and rotatably support the wheel with respect to the vehicle body. The rotation detection device 1 and a magnetic encoder 71 which is a detected object detected by the rotation detection device 1 are provided. The rotation detection device 1 has the configuration described with reference to FIG. 1, but the outer shape thereof is not the same as the shape shown in FIG. 1, and has a shape corresponding to the mounting form for each example.

The outer member 51 is a fixed member, and the inner member 52 is a rotating member. The rolling elements 53 of each row are held by the cage 54 for each row, and are formed on the outer circumference of the inner row 52 and the double row rolling surfaces 55 formed on the inner circumference of the outer member 51. Further, it is interposed between the double row rolling surfaces 56. These wheel bearings are of a double row angular contact ball bearing type, and the rolling surfaces 55, 55, 56, 56 of both rows are formed such that the contact angles are back to back. Hereinafter, the wheel bearings in each figure will be described individually.

The example of FIG. 5 is a so-called third generation type, which is an example applied to driving wheel support. The inner member 52 includes two members, a hub wheel 57 and an inner ring 58 fitted to the outer periphery of the inboard side portion of the shaft portion 57a of the hub wheel 57. The rolling surfaces 56 of each row are formed on the outer periphery of 58. The shaft portion 57a of the hub wheel 57 has a center hole 57c through which a stem portion of a constant velocity joint (not shown) is inserted. The inner ring 58 is fitted in a stepped portion formed in the shaft portion 57a of the hub wheel 57, and is fixed to the hub wheel 57 by a crimping portion 57aa provided at the inboard side end of the shaft portion 57a. The hub wheel 57 has a wheel mounting flange 57b on the outer periphery in the vicinity of the end portion on the outboard side, and a wheel and a brake rotor (both not shown) are attached to the wheel mounting flange 57b by a hub bolt 59. The hub bolt 59 is press-fitted into a bolt mounting hole provided in the wheel mounting flange 57b. The outer member 51 is an integral member as a whole, and has a vehicle body mounting flange 51b on the outer periphery. The outer member 51 is attached to a knuckle (not shown) of the suspension device by a knuckle bolt inserted through the bolt hole 60 of the vehicle body attachment flange 51b.
Both ends of the bearing space between the outer member 51 and the inner member 52 are sealed by sealing devices 61 and 62 made of contact seals or the like.

  The magnetic encoder 71 is composed of a ring-shaped multipolar magnet having magnetic poles N and S alternately in the circumferential direction, and is installed in a fitted state on the outer peripheral surface of the inner member 52 between the rolling elements 53 and 53. The detected body 71 is made of, for example, a structure in which a multi-pole magnet 71b such as a rubber magnet or a plastic magnet is provided on the outer periphery of the core bar 71a, or a sintered magnet.

  The rotation detecting device 1 is attached to the outer member 51 by being inserted through a sensor mounting hole 63 that is radially penetrated between the rolling element rows 53, 53, and the tip (the portion in which the sensor 4 in FIG. 1 is embedded). ) Is opposed to the magnetic encoder 71, which is the object to be detected, in the radial direction via a magnetic gap. The sensor mounting hole 63 is a through hole having a circular cross-sectional shape, for example. The inner surface of the sensor mounting hole 63 and the rotation detection device 1 may be sealed with a contact seal such as an O-ring or an adhesive.

The rotation detection device 1 has an axial insertion portion 1 a having an inner diameter that substantially fits in the sensor mounting hole 63 and a head portion 1 b that is a non-insertion portion. The head portion 1 b is formed on the outer peripheral surface of the outer member 51. Arranged in contact. The cable 8A is pulled out from the head 1b. The said insertion part 1a and the head 1b are comprised with the elastic member 11A of FIG. The rotation detection device 1 may be protected by covering the head 1b with a cover made of metal or resin.
The cable 8A includes the cable core wire 6, the cable insulation coating 7, and the cable cover 8 shown in FIG. In the example of FIG. 1, the cable is shown in a straight line, but when mounted on the wheel bearing in the example of FIG. 5, the rotation detection device 1 bends the cable 8 </ b> A as shown in FIG. 13, for example. In the figure, the schematic cross-sectional shape of the portion constituted by the elastic member 11A of FIG.

  According to the wheel bearing device of this configuration, for example, even when used in a severe environment where a large temperature change from several tens of degrees to minus several tens of degrees occurs, the elastic member 11A of the rotation detection device 1 changes in temperature. Follow and elastically deform. Moreover, even if the vibration accompanying a vehicle travel is added to the wheel bearing device 12, the elastic member 11A of the rotation detecting device 1 is elastically deformed following the vibration. Therefore, it is possible to prevent water and the like from undesirably entering the bearing from between the rotation detection device 1 and the inner surface of the sensor mounting hole 63 of the outer member 51. Even in such a severe environment, in the rotation detection device 1, when different thermal expansion occurs between the sensor assembly 3 and the elastic member 11A that is the molding material, the thermal expansion difference is absorbed by the elasticity of the elastic member 11A. Can do. Therefore, it is possible to prevent an undesired gap from being generated between the sensor assembly 3 and the elastic member 11A, and the waterproofness of the sensor assembly 3 itself can be maintained. Therefore, it is possible to realize a wheel bearing device that satisfies the performance required for automobile parts, such as mechanical strength, waterproofness, weather resistance, and chemical resistance.

FIG. 6 shows the wheel bearing shown in FIG. 5 in which the opposing direction of the rotation detector 1 and the magnetic encoder 71 is the axial direction. The magnetic encoder 71 has a multi-pole magnet 71b provided on a standing plate portion of a core bar 71a having an L-shaped cross section. Rotation detecting device 1, the internal sensor 4 at the tip is facing pairs in the axial direction with respect to the multi-pole magnet 71b of the magnetic encoder 71.

FIG. 7 shows the wheel bearing shown in FIG. 5 in which the rotation detection device 1 is attached to the inboard side end of the outer member 51 via a sensor attachment member 72. The sensor mounting member 72 is a ring-shaped metal plate that fits on the outer peripheral surface of the outer member 51 and contacts the end surface, and has a sensor mounting piece 72a for mounting the rotation detection device 1 on a part of the circumferential direction. ing. The magnetic encoder 71 is provided with a multipolar magnet 71 b on a standing plate portion of a core bar 71 a having an L-shaped cross section, and is fitted to the outer periphery of the inner ring 58. The magnetic encoder 71 also serves as a part of the sealing device 61 on the inboard side. The magnetic encoder 71 and the rotation detection device 1 face each other in the axial direction.
In the case of this configuration, the outer member 1 is not provided with the sensor mounting hole 63 in the example of FIG. 5, so there is no problem of water intrusion from the sensor mounting hole 63. Other configurations and effects are the same as in the example of FIG.

FIG. 8 shows an example in which the sealing device 61 for the bearing space on the inboard side is arranged outside the magnetic encoder 71 in the example shown in FIG. That is, a sealing device 61 made of a contact seal or the like is provided between the annular sensor mounting member 72 attached to the outer member 51 and the inner ring 58.
In the case of this configuration, the magnetic encoder 71 is sealed against the external space by the sealing device 61, and it is possible to prevent foreign matter from being caught between the magnetic encoder 71 and the rotation detection device 1. Other configurations and effects are the same as in the example of FIG.

  FIG. 9 is for a driven wheel in the example shown in FIG. 5, and the hub wheel 57 does not have a center hole and is solid. The end of the outer member 51 on the inboard side extends in the axial direction from the inner member 52, and the end surface opening is covered with a cover 74. The cover 74 is fitted and attached to the inner periphery of the outer member 51 with a flange 74a provided on the outer peripheral edge. The rotation detection device 1 is attached to the cover 74 so as to face the magnetic encoder 71. In the cover 74, at least a sensor portion (a portion in which the sensor 4 is embedded) 4A of the rotation detection device 1 is fitted, and the rotation detection device main body is detachably provided using a bolt, a nut, or the like not shown. . In a state where the sensor portion 4A is fitted in the cover 74, the annular gap of the cover 74 that can be formed between the rotation detection device main body is tightly sealed by the elasticity of the molding material (elastic member) that covers the sensor portion 4A. It is the composition which becomes. The magnetic encoder 71 is fitted and attached to the outer periphery of the inner ring 58 and faces the rotation detection device 1 in the radial direction.

  In the case of this configuration, the application to the driven wheel is limited, but the entire end opening of the outer member 51 is covered by the cover 74, and high sealing performance can be obtained with a simple configuration. Other configurations and effects are the same as those in the example of FIG.

  FIG. 10 shows a configuration in which the magnetic encoder 71 and the rotation detection device 1 are opposed to each other in the axial direction in the example shown in FIG. Other configurations and effects are the same as in the example of FIG.

The wheel bearing shown in FIG. 11 is an example of a so-called fourth generation type, and the inner member 52 includes a hub wheel 57A and a constant velocity joint outer ring 81.
The constant velocity joint 80 is formed by forming a plurality of track grooves along the axial direction on the spherical inner surface of the outer ring 81 and the spherical outer surface of the inner ring 82, and interposing the torque transmission balls 84 between the opposed track grooves. . The torque transmission ball 84 is held by the cage 85. The inner ring 82 is fitted to the shaft 86. In the constant velocity joint outer ring 81, a hollow shaft-shaped stem portion 81b protrudes from the outer bottom surface of the cup portion 81a. The stem portion 81b is inserted into the wheel hub 57A of the wheel bearing, and is integrally coupled to the wheel hub 57A by diameter expansion caulking. A rolling surface 56 of each row of the inner member 52 is formed on the hub wheel 57 </ b> A and the constant velocity joint outer ring 81. A bellows-like boot 87 is placed between the opening of the cup portion 81 a of the constant velocity joint outer ring 81 and the outer periphery of the shaft 86.

As in the example of FIG. 5, the rotation detection device 1 is attached by inserting the sensor attachment hole 63 through the outer member 51 and inserting the sensor attachment hole 63 into the hole 63. As in the example of FIG. 5, the magnetic encoder 71 is attached to the outer periphery of the hub wheel 57 </ b> A in the inner member 52 in a fitted state. The magnetic encoder 71 and the rotation detection device 1 are opposed to each other in the radial direction.
Also in this example, the same operation and effect as the example of FIG.

  FIG. 12 shows an example in which the magnetic encoder 71 is opposed to the rotation detection device 1 in the axial direction in the example of FIG. Other configurations and effects are the same as in the example of FIG.

Each of the above drive wheel bearing has dealt with an example of a third-generation and fourth-generation, this is the rotation detector equipped wheel support bearing, first generation hub and bearing is provided separately The present invention can also be applied to a wheel bearing of a type or a second generation type, and can also be applied to a wheel bearing in which an outer member is a rotation side and an inner member is a fixed side. Further, the present invention can be applied not only to the angular ball bearing type but also to a tapered roller type and various other wheel bearings. Furthermore, the detected object detected by the rotation detection device 1 is not limited to a magnetic encoder, and may be, for example, a metal gear-shaped pulsar ring.

It is sectional drawing of the rotation detection apparatus which concerns on a reference proposal example . FIG. 2A is a sectional view of the sensor assembly, and FIG. 2B is a plan view of the sensor assembly. It is sectional drawing showing the stage before the compression molding by the metal mold | die of an upper mold | type, a lower mold | type, a rubber material, and a sensor assembly in the manufacturing method of the rotation detection apparatus which concerns on embodiment of this invention . FIG. 4 is a cross-sectional view illustrating a state in which a sensor assembly and a rubber material are interposed between an upper mold and a lower mold , according to the manufacturing method . It is sectional drawing of the wheel bearing which concerns on a reference proposal example . It is sectional drawing of the wheel bearing which concerns on the other reference proposal example . It is sectional drawing of the wheel bearing which concerns on another reference proposal example . It is sectional drawing of the wheel bearing which concerns on another reference proposal example . It is sectional drawing of the wheel bearing which concerns on another reference proposal example . It is sectional drawing of the wheel bearing which concerns on another reference proposal example . It is sectional drawing of the wheel bearing which concerns on another reference proposal example . It is sectional drawing of the wheel bearing which concerns on another reference proposal example . FIG. 10 is a partially omitted cross-sectional view of a rotation detection device according to another reference proposal example .

Explanation of symbols

1: rotation detection device 2: mold 3: sensor assembly 4: sensor 5: electrode terminal 6: cable core wire 7: cable insulation coating 8: cable cover 9: upper mold 10: lower mold 11: rubber material 11A: elastic member 12: Wheel bearing device 51: outer member 52: inner member 53: rolling elements 55, 56: rolling surface 57: hub wheel 58: inner ring 63: sensor mounting hole 71: magnetic encoder 81: constant velocity joint outer ring

Claims (1)

A magnetic sensor to be disposed opposite to a magnet body or a metal body provided on a rotating member, and peripheral parts electrically or mechanically connected to the magnetic sensor are made of a thermoplastic elastomer or rubber. Having a process of compression molding with a mold together with a material showing elasticity ;
The mold includes an upper mold and a lower mold,
The process includes
A step of interposing a rubber material mixed with the magnetic sensor, peripheral components, and a vulcanizing agent between the upper mold and the lower mold; and
Heating at least one of the upper mold and the lower mold;
After the step, applying a pressure between the upper mold and the lower mold,
Method of manufacturing a rotation detecting device according to claim Rukoto to have a.

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