JP2009281455A - Wheel bearing device with rotation speed detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheel bearing device with a rotation speed detector improving reliability by easing harness connection working, and improving sealing performance by keeping an accuracy of attaching hole into which a sensor is interfit. <P>SOLUTION: The wheel bearing device with the rotation speed detector, in which a sensor attaching hole 17 is formed in penetration between double rows outside trucking surfaces 5a, 5b of an external member 5, a sensor holder 19 is interfit into this sensor attaching hole 17, a rotation speed sensor 18 is embedded in the sensor holder 19, and magnetic encoders 22 face each other. A pitch circle diameter PCDo of outer side rolling element 4 trains is set longer than an inner side pitch circle diameter PCDi, and the number of rolling elements of outer side rolling element 4 trains is set more than that of inner side. The sensor attaching hole 17 is formed so that it may open at a cylindrical shoulder 16 by avoiding a step 15, and the sensor holder 19 is positioned by projecting at a predetermined quantity from the shoulder 16. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wheel bearing device with a rotational speed detection device that rotatably supports a wheel of an automobile or the like and incorporates a rotational speed detection device that detects the rotational speed of the wheel.

  A wheel bearing with a rotation speed detecting device that rotatably supports a vehicle wheel with respect to a suspension device and controls an anti-lock brake system (ABS) to detect the rotation speed of the wheel. Devices are generally known. As an example of this, a structure as shown in FIG. 6 is known. This wheel bearing device with a rotational speed detection device has a vehicle body mounting flange 51b integrally attached to the suspension on the outer periphery, and an outer side in which double-row outer rolling surfaces 51a and 51a are formed on the inner periphery. A member 51 and a wheel mounting flange 53 for mounting a wheel (not shown) at one end are integrally formed, and an inner rolling surface 52a facing one of the double-row outer rolling surfaces 51a and 51a on the outer periphery. A hub wheel 52 having a small-diameter stepped portion 52c formed from the inner rolling surface 52a via a shoulder portion 52b, and fitted and fixed to the hub wheel 52, the outer rolling surfaces 51a and 51a of the double row on the outer periphery. And an inner ring 54 formed with an inner rolling surface 54a facing the other.

  The hub wheel 52 is rotatably supported on the inner diameter side of the outer member 51 via double rows of balls 55 and 55. At the same time, an encoder 56 in which the characteristics extending in the circumferential direction are alternately and equally spaced is fixed to a part of the hub wheel 52. The rotational speed of the encoder 56 can be detected by a sensor 57 supported by a part of the outer member 51. In order to improve the detection accuracy, it is conceivable to increase the outer diameter of the portion where the characteristic of the encoder 56 is changed by forming the encoder 56 into a circular shape with a cross-sectional crank shape. Such an encoder 56 changes the characteristics of the outer peripheral surface of the large-diameter cylindrical portion 56a constituting the outer diameter side portion alternately and at equal intervals over the circumferential direction, and the small-diameter cylindrical portion constituting the inner diameter side portion. 56b is disposed radially inward of the outer member 51 in a state where the outer member 56b is fitted and fixed to the intermediate portion 58 of the hub wheel 52. The sensor 57 is supported by a mounting hole 57 a provided in the axially intermediate portion of the outer member 51, and the detection portion of the sensor 57 is opposed to the outer peripheral surface of the large-diameter cylindrical portion 56 a of the encoder 56. ing.

  When such a wheel bearing device with a rotational speed detection device is used, the outer member 51 is supported by the suspension device, and the wheel is fixed to the wheel mounting flange 53 of the hub wheel 52, and the wheel is attached to the suspension device. And is rotatably supported. And the output of the sensor 57 which opposes the encoder 56 changes with rotation of a wheel. Since the frequency at which the output of the sensor 57 changes is proportional to the rotational speed of the wheel, the ABS is appropriately controlled by sending the output signal of the sensor 57 to a controller (not shown) that determines the rotational speed of the wheel. Can do.

  In the case of this type of wheel bearing device with a rotational speed detection device, assembly work is troublesome, and it is difficult to achieve both quality assurance and cost reduction. That is, when assembling, first, the hub wheel 52 is inserted into the inner diameter side of the outer member 51, and then the encoder 56 is fitted and fixed to the intermediate portion 58 of the hub wheel 52 by an interference fit. In this encoder 56, the outer diameter of the large-diameter cylindrical portion 56a is made as large as possible in order to increase the change in characteristics in the circumferential direction. It moves in the proximity position of the inner peripheral surface of the direction member 51. For this reason, if the press-fitting operation of the encoder 56 is not performed carefully, the encoder 56 is press-fitted in a state of being inclined with respect to the hub wheel 52.

In order to solve such a problem, the hub wheel 52 has a guide portion 59 between a small diameter step portion 52c to which the inner ring 54 is fitted and fixed and an intermediate portion 58 to which the encoder 56 is fitted and fixed, via a shoulder portion 52b. Is formed. The guide portion 59 is formed to have a slightly smaller diameter than the inner diameter dimension of the small diameter cylindrical portion 56b of the encoder 56 in the free state. As a result, when the encoder 56 is press-fitted into the intermediate portion 58 of the hub wheel 52, the small-diameter cylindrical portion 56b is loosely fitted in the guide portion 59 in advance without looseness, so that the core between the encoder 56 and the hub wheel 52 is fitted. Can be combined. Therefore, the encoder 56 hardly tilts with respect to the hub wheel 52, and the outer peripheral edge of the large-diameter cylindrical portion 56a can be prevented from interfering with the outer member 51, and the insertion operation of the encoder 56 is facilitated. It is possible to achieve both quality assurance and cost reduction.
JP-A-11-72116

  In this conventional wheel bearing device with a rotational speed detection device, the output of the sensor 57 is taken out by a harness 60 and attached in advance to the vehicle side with a connector (not shown) fixed to the tip of the harness 60. The connector is connected. In this case, the harness 60 is routed from the sensor 57. However, at this time, it is necessary to take out the harness 60 so that the harness 60 is not worn due to interference with peripheral components or is damaged. In addition, the harness 60 is difficult and complicated to pack even during the assembly process and transport of the bearing.

  Furthermore, when the respective PCDs (pitch circle diameters) of the double-row balls 55 and 55 are different on the left and right sides to increase the bearing life and rigidity, the double-row outward rotation of the outer member 51 is caused by the difference in PCD. The inner diameters of the shoulder portions of the running surfaces 51a and 51a are also different on the left and right. Therefore, the mounting hole 57a of the sensor 57 is formed in a state where a step is provided in the inner diameter portion of the outer member 51. In other words, when the mounting hole 57a is to be formed in the stepped portion, when the processing tool such as a drill penetrates the outer member 51 and reaches the inner diameter portion, the processing tool is tilted and temporarily swung. Will be. This deteriorates the accuracy of the mounting hole 57a, and it is difficult to ensure the sealing performance even if the sensor 57 is inserted into the mounting hole 57a via a seal member such as an O-ring. May not only lower the detection accuracy but also lead to a short bearing life.

  The present invention has been made in view of such circumstances, simplifying the wiring work of the harness, ensuring the accuracy of the mounting hole into which the sensor is inserted, improving the sealing performance, and improving the reliability. An object of the present invention is to provide a wheel bearing device with a rotational speed detection device.

  In order to achieve such an object, the invention described in claim 1 of the present invention has a vehicle body mounting flange integrally attached to the knuckle on the outer periphery, and a double row outer rolling surface is integrally formed on the inner periphery. An outer rolling member formed integrally with a wheel mounting flange for mounting a wheel at one end portion, an inner rolling surface facing one of the outer rolling surfaces of the double row on the outer periphery, and the inner rolling surface A hub wheel formed with a small-diameter step portion extending in the axial direction from the shaft to the shaft portion, and fitted and fixed to the small-diameter step portion of the hub wheel, and opposed to the other of the outer rolling surfaces of the double row on the outer periphery. An inner member composed of an inner ring formed with an inner rolling surface or an outer joint member of a constant velocity universal joint, and a double row accommodated in a freely rolling manner between the rolling surfaces of the inner member and the outer member Rolling element row and an opening of an annular space formed between the outer member and the inner member A sensor mounting hole is formed through the outer rolling surface of the double row of the outer member, and a sensor holder is formed in the sensor mounting hole. With a rotational speed detection device in which a rotational speed sensor for detecting the rotational speed of the wheel is embedded in the sensor holder, and the rotational speed sensor is opposed to the encoder via a predetermined radial clearance. In the wheel bearing device, pitch circle diameters in the double row rolling element rows are set differently on the left and right sides, and the sensor mounting hole is a cylindrical shoulder of the shoulders of the outer rolling surface of the double row. It is formed so as to open in the part.

  As described above, an encoder disposed on the hub wheel is provided, and a sensor mounting hole is formed between the outer rolling surfaces of the double row of the outer member, and the sensor holder is fitted into the sensor mounting hole. In the wheel bearing device with a rotational speed detection device, the rotational speed sensor for detecting the rotational speed of the wheel is embedded in the sensor holder, and the rotational speed sensor is opposed to the encoder through a predetermined radial clearance. Since the pitch circle diameter in the rolling element row of the two is set differently on the left and right, the sensor mounting hole is formed to open to the cylindrical shoulder portion of the shoulder portion of the outer rolling surface of the double row. When a processing tool such as a drill penetrates the outer member and reaches the inner diameter portion, it is not affected by the step portion of the inner diameter portion, and the processing tool does not tilt or vibrate. Therefore, it is possible to provide a wheel bearing device with a rotational speed detection device that ensures the accuracy of the sensor mounting hole, improves the sealing performance, and improves the reliability.

  Preferably, as in the invention according to claim 2, if the connector to which the harness is attached is formed integrally with the sensor holder, the harness can be coupled to the sensor holder after the assembly to the vehicle. It is possible to prevent the harness from interfering with the surrounding parts in the process, and to be worn and damaged and to be disconnected, and the harness is difficult to handle during the assembly process and transport of the bearing, resulting in a complicated packing form. In addition, the assembly work can be simplified and the reliability can be improved.

  Further, as in the third aspect of the invention, if the sensor holder is positioned and fixed by projecting a predetermined amount from the shoulder portion of the outer member, it is sufficient between the encoder and the shoulder portion of the outer member. As a result, there is no need to carefully work to prevent interference between the encoder and the outer member during assembly, assembling can be simplified, and work efficiency can be increased, resulting in lower costs. Can be achieved.

  According to a fourth aspect of the present invention, a metal ring is externally fixed to the shaft-like portion of the hub wheel, and the encoder is mixed with magnetic powder in an elastomer, and the metal ring is bonded by vulcanization. If it is composed of a magnetic encoder that is integrally joined to the ring and is alternately magnetized with magnetic poles N and S in the circumferential direction, it can detect the speed with high accuracy at low cost, and the output signal from the magnetic material. It is not affected by the outer member.

  Further, if the sensor holder is formed by injection molding from a non-magnetic synthetic resin material as in the invention described in claim 5, it does not adversely affect the sensing performance of the rotational speed sensor and has excellent corrosion resistance. The strength and durability can be improved over a long period of time.

  Further, as in the invention described in claim 6, the pitch circle diameter of the outer rolling element row of the double row rolling element rows is set larger than the pitch circle diameter of the inner rolling element row. In addition, if the number of rolling elements in the outer side rolling element row is set to be larger than the number of rolling elements in the inner side rolling element row, the outer side can be made lighter and more compact than the inner side. The rigidity of the bearing row can be improved and the life of the bearing can be extended.

  In addition, as in the invention described in claim 7, a mortar-shaped recess is formed by forging at the outer end of the hub wheel, and the thickness of the end corresponding to the recess is substantially uniform. If this is set, it is possible to provide a wheel bearing device that can simultaneously solve the conflicting problems of light weight, compactness and high rigidity of the device.

  The wheel bearing device with a rotational speed detection device according to the present invention has an outer body integrally provided with a vehicle body mounting flange for being attached to a knuckle on the outer periphery, and an outer side in which a double row outer rolling surface is integrally formed on the inner periphery. A member, a wheel mounting flange for mounting a wheel at one end, and an inner rolling surface opposed to one of the outer rolling surfaces of the double row on the outer periphery; and an axial portion from the inner rolling surface A hub ring formed with a small-diameter step portion extending in the axial direction through the inner ring, and an inner rolling surface that is fitted and fixed to the small-diameter step portion of the hub ring and faces the other outer side of the double-row outer rolling surface An inner member formed of an outer joint member of an inner ring or a constant velocity universal joint formed with the inner ring, and a double row rolling element row accommodated in a freely rolling manner between the rolling surfaces of the inner member and the outer member. And an opening in an annular space formed between the outer member and the inner member. And a sensor mounting hole is formed through the outer rolling surface of the double row of the outer member. The sensor mounting hole A rotation speed sensor is embedded in the sensor holder, a rotation speed sensor for detecting the rotation speed of the wheel is embedded in the sensor holder, and the rotation speed sensor is opposed to the encoder via a predetermined radial clearance. In the wheel bearing device with a detecting device, pitch circle diameters in the double row rolling element rows are set differently on the left and right sides, and the sensor mounting hole is a cylinder of the shoulders of the outer rolling surface of the double row. Since the drilling tool or the like penetrates the outer member and reaches the inner diameter part, it is not affected by the step part of the inner diameter part, and the machining tool tilts or vibrates. To do There. Therefore, it is possible to provide a wheel bearing device with a rotational speed detection device that ensures the accuracy of the sensor mounting hole, improves the sealing performance, and improves the reliability.

  A vehicle body mounting flange to be attached to the knuckle on the outer periphery, an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and a wheel mounting flange to mount a wheel on one end A hub wheel integrally formed and formed on the outer periphery with an inner rolling surface facing one of the double row outer rolling surfaces, and a cylindrical small-diameter stepped portion extending in the axial direction from the inner rolling surface; and An inner member comprising an inner ring press-fitted into the small-diameter step portion of the hub wheel and having an inner rolling surface facing the other of the outer rolling surfaces of the double row on the outer periphery, and the inner member and the outer member A double row rolling element row accommodated between both rolling surfaces of the member, and a seal attached to an opening of an annular space formed between the outer member and the inner member; A magnetic encoder disposed on the hub wheel, and between the outer rolling surfaces of the double row of the outer member A sensor mounting hole is formed through the sensor mounting hole, and a sensor holder is fitted into the sensor mounting hole, and a rotational speed sensor for detecting the rotational speed of the wheel is embedded in the sensor holder. In the wheel bearing device with a rotational speed detection device opposed to the encoder through a predetermined radial clearance, the outer side rolling element row of the double row rolling element row has a pitch circle diameter of the inner side rolling element row. Is set to be larger than the pitch circle diameter, the number of rolling elements in the outer rolling element row is set to be larger than the number of rolling elements in the inner rolling element row, and the sensor mounting hole is It is formed so as to open to a cylindrical shoulder portion of the shoulder portions of the double row outer rolling surface, and the sensor holder projects and protrudes from the shoulder portion by a predetermined amount.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a first embodiment of a wheel bearing device with a rotational speed detection device according to the present invention, and FIG. 2 is an enlarged view of a main part showing a detection unit of FIG. In the following description, the side closer to the outer side of the vehicle when assembled to the vehicle is referred to as the outer side (left side in FIG. 1), and the side closer to the center is referred to as the inner side (right side in FIG. 1).

  This wheel bearing device with a rotational speed detection device is called a third generation for driving wheels, and includes an inner member 3 composed of a hub wheel 1 and an inner ring 2, and double row rolling elements (balls) on the inner member 3. 4 and 4 and an outer member 5 that is inserted through 4 and 4.

  The hub wheel 1 integrally has a wheel mounting flange 6 for attaching a wheel (not shown) to an end portion on the outer side, and hub bolts 6 a are implanted at circumferentially equidistant positions of the wheel mounting flange 6. Yes. Further, an outer side (one) inner rolling surface 1a and a cylindrical small-diameter step portion 1b extending in the axial direction from the inner rolling surface 1a are formed on the outer periphery, and a torque transmission serration ( Or a spline) 1c is formed. An inner ring 2 having an inner side (other side) inner raceway surface 2a formed on the outer periphery is press-fitted into the small-diameter step portion 1b of the hub wheel 1 through a predetermined shimiro, and the end of the small-diameter step portion 1b is radially outward. It is fixed in the axial direction with a predetermined bearing preload applied by a caulking portion 1d formed by plastic deformation in the direction.

  The hub wheel 1 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and includes an inner rolling surface 1a and a wheel mounting flange 6 that becomes a seal land portion of an outer seal 8 to be described later. The surface hardness is set in the range of 58 to 64 HRC by induction hardening from the inner side base portion 6b to the small diameter step portion 1b. The caulking portion 1d is an unquenched portion after forging. As a result, not only the wear resistance of the base portion 6b is improved, but also the fretting of the small-diameter stepped portion 1b serving as the fitting surface of the inner ring 2 is suppressed and the rotational bending load applied to the wheel mounting flange 6 is suppressed. And sufficient mechanical strength, and the durability of the hub wheel 1 is improved. Further, the inner ring 2 and the rolling element 4 are made of high carbon chrome bearing steel such as SUJ2, and are hardened in a range of 58 to 64 HRC up to the core part by quenching.

  The outer member 5 is made of medium-high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and integrally has a vehicle body mounting flange 5c for attaching to a knuckle (not shown) on the outer periphery. Are integrally formed with double-row outer rolling surfaces 5a, 5b facing the double-row inner rolling surfaces 1a, 2a of the inner member 3. These outer rolling surfaces 5a and 5b are subjected to a hardening treatment in a range of 58 to 64 HRC by induction hardening. And between the outer side rolling surface 5a, 5b of this outer member 5, and the double row inner side rolling surface 1a, 2a which opposes these, the double row rolling elements 4, 4 are each accommodated, and the holder | retainer 7 is stored. , 7 are held in a rollable manner. In addition, seals 8 and 9 are attached to the opening of the annular space formed between the outer member 5 and the inner member 3, and leakage of lubricating grease sealed inside the bearing and the inside of the bearing from the outside. Prevents intrusion of rainwater and dust.

  Here, the wheel bearing device constituted by a double row angular contact ball bearing in which the rolling element 4 is a ball is illustrated, but the present invention is not limited to this, and a double row tapered roller bearing using a tapered roller for the rolling element 4 is used. May be. Moreover, although the third-generation wheel bearing device has been illustrated, the present invention is not limited to this, and a fourth-generation structure may be used.

  In this embodiment, the pitch circle diameter PCDo of the four outer rolling elements is set to be larger than the pitch circle diameter PCDi of the four inner rolling elements (PCDo> PCDi), and the double-row rolling elements are arranged. Although the sizes of 4 and 4 are the same, the number of rolling elements Zo of the four rolling elements on the outer side is set to be larger than the number of rolling elements Zi of the four rolling elements on the inner side (Zo> Zi). Yes. Thereby, the rigidity of the bearing row on the outer side can be improved as compared with the inner side, and the life of the bearing can be extended while reducing the weight and size.

  Here, the pitch circle diameter PCDo of the four outer rolling elements is larger than the pitch circle diameter PCDi of the inner four rolling elements (PCDo> PCDi), and the four outer rolling elements are arranged. The number of rolling elements Zo is set to be larger than the number of rolling elements Zi of the four rolling elements on the inner side (Zo> Zi), but the load applied to the inner and outer bearing rows Are different from each other, and when the load applied to the inner bearing row is larger than the load applied to the outer bearing row, it may be configured as PCDo <PCDi, Zo <Zi as appropriate. The size of the moving body 4 may be changed between the left and right bearing rows.

  Here, the outer ring of the hub wheel 1 has a counter portion 10 from the groove bottom portion of the inner rolling surface 1a, and a tapered step portion 11 and a shaft-like portion from the counter portion 10 in accordance with the difference in pitch circle diameters PCDo and PCDi. 12 is formed in a shape following the shoulder 13 and the small-diameter step portion 1b with which the inner ring 2 is abutted.

  On the other hand, the outer member 5 is formed such that the outer rolling surface 5a on the outer side has a larger diameter than the outer rolling surface 5b on the inner side due to the difference in pitch circle diameters PCDo and PCDi, and is enlarged in FIG. As shown, the shoulder portion 14 of the outer rolling surface 5a on the outer side and the shoulder portion 16 of the outer rolling surface 5b on the inner side, which is the small diameter side, are formed via the step portion 15, and this shoulder portion A sensor mounting hole 17 is formed through 16 in the radial direction. A sensor holder 19 in which a rotation speed sensor 18 is embedded is fitted in the sensor mounting hole 17.

  The sensor holder 19 is formed by injection molding from a non-magnetic special ether-based synthetic resin material such as polyphenylene sulfide (PPS), and further a reinforcing material such as GF (glass fiber) is added. As a result, the sensing performance of the rotation speed sensor 18 is not adversely affected, the corrosion resistance is excellent, and the strength and durability can be improved over a long period of time. The rotation speed sensor 18 incorporates a magnetic detection element that changes its characteristics according to the flow direction of magnetic flux, such as a Hall element, a magnetoresistive element (MR element), and a waveform shaping circuit that adjusts the output waveform of the magnetic detection element. It consists of IC. In addition to the above-described materials, the sensor holder 19 can be exemplified by synthetic resins that can be injection-molded such as PA (polyamide) 66, PPA (polyphthalamide), PBT (polybutylene terephthalate), and the like.

  A connector 20 to which a harness (not shown) is attached is formed integrally with the sensor holder 19 (see FIG. 1). As a result, the harness can be coupled to the sensor holder 19 after being assembled into the vehicle, and the harness can be prevented from being worn out by interfering with peripheral parts in the assembling process, or from being damaged and disconnected, and the bearing. Even during the assembly process and transport, the harness is difficult to handle and does not become a complicated packing form, so that the assembly work can be simplified and the reliability can be improved.

  The sensor holder 19 has a rod shape, and a seal member 21 made of an O-ring or the like is mounted on the outer periphery thereof. The sensor holder 19 is inserted into the sensor mounting hole 17 by elastically contacting the seal member 21. As a result, foreign matter such as muddy water and dust can be prevented from entering from the sensor mounting hole 17. The seal member 21 may be mounted on the sensor mounting hole 17 side.

  The magnetic encoder 22 is integrally joined to the metal ring 23 attached to the hub wheel 1 by vulcanization adhesion. This magnetic encoder 22 is composed of an elastomer such as rubber mixed with magnetic powder such as ferrite, and magnetic poles N and S are alternately magnetized in the circumferential direction to constitute a rotary encoder. The rotational speed sensor 18 is disposed via a predetermined radial clearance (air gap). On the other hand, the metal ring 23 includes a small-diameter cylindrical portion 23a that is externally fitted and fixed to the shaft-shaped portion 12 of the hub wheel 1, a standing plate portion 23b that extends radially outward from the small-diameter cylindrical portion 23a, and the standing plate portion 23b. And a large-diameter cylindrical portion 23c extending in the axial direction from, for example, a ferromagnetic steel plate, for example, a ferritic stainless steel plate (JIS standard SUS430 system, etc.), a cold rolled steel plate (JIS standard SPCC system, etc.) ) To a generally U-shaped cross section by press working. As a result, high-speed speed detection can be performed at low cost, and the magnetic output of the magnetic encoder 22 can be strengthened to ensure stable detection accuracy.

  Here, as an example of the rotational speed detection device, an active type rotational speed detection device including the magnetic encoder 22 and the rotational speed sensor 18 including a magnetic detection element such as a Hall element is illustrated. However, the rotational speed detection device according to the present invention is exemplified. The apparatus is not limited to this, and may be, for example, a passive type including a gear and the like, a magnet and an annular coil wound around.

  In the present embodiment, the sensor mounting hole 17 is formed so as to penetrate in the radial direction of the outer member 5 and is opened to the cylindrical shoulder portion 16 while avoiding the step portion 15 of the inner diameter portion. When the tool passes through the outer member 5 and reaches the inner diameter portion, it is not affected by the step portion 15 and the machining tool does not tilt or vibrate during machining. Therefore, it is possible to provide a wheel bearing device with a rotation speed detection device that ensures the accuracy of the sensor mounting hole 17 to improve the sealing performance and improve the reliability.

  Further, when the sensor holder 19 is inserted into the sensor mounting hole 17, the sensor holder 19 protrudes from the shoulder portion 16 of the outer member 5 by a predetermined amount and is positioned and fixed. As a result, a sufficient annular space exists between the magnetic encoder 22 and the shoulder 16 of the outer member 5, so that the outer member 5 made of a magnetic material adversely affects the output signal of the magnetic encoder 11. There is nothing. In addition, the metal ring 23 to which the magnetic encoder 22 is joined is inserted and fixed to the shaft portion 12 of the hub wheel 1 after the hub wheel 1 is first inserted into the inner diameter side of the outer member 5. At the time of this external fitting fixing work, it is not necessary to work carefully to prevent interference with the shoulder portion 16 of the outer member 5, so that the assembling work can be simplified and the work efficiency can be improved and the cost can be reduced. Can do.

  FIG. 3 is a longitudinal sectional view showing a second embodiment of the wheel bearing device with a rotation speed detection device according to the present invention. Note that this embodiment basically differs from the above-described embodiment only in the configuration of the hub wheel, and other parts and portions having the same parts or the same functions as those of the above-described embodiments are denoted by the same reference numerals. Detailed description is omitted.

  This wheel bearing device with a rotational speed detecting device is called a third generation for driven wheels, and includes an inner member 25 comprising a hub wheel 24 and an inner ring 2, and double row rolling elements 4, 4 on the inner member 25. And an outer member 5 inserted through the outer periphery.

  In the present embodiment, the hub wheel 24 integrally has a wheel mounting flange 6 at one end, the inner rolling surface 1a on the outer periphery, the counter unit 10 from the groove bottom of the inner rolling surface 1a, and the counter unit. A small-diameter step portion 1 b is formed from 10 through a tapered step portion 11 and a shaft-like portion 12. Further, a mortar-shaped recess 26 is formed at the outer end of the hub wheel 24 by forging. The depth of the recess 26 extends beyond the groove bottom portion of the inner rolling surface 1a to the vicinity of the step portion 11, and the end portion on the outer side of the hub wheel 24 is formed to have a substantially uniform thickness. . As a result, even when a moment load is applied to the wheel mounting flange 6, it is possible to achieve weight reduction while ensuring sufficient strength and rigidity.

  As in the above-described embodiment, the sizes of the left and right rolling elements 4 and 4 rows are the same, but the pitch circle diameter PCDo of the outer rolling elements 4 rows is equal to the pitch circle diameter PCDi of the inner rolling elements 4 rows. The diameter is set to be larger than that, and the number of the outer side rolling elements 4 is accommodated accordingly. And since the thickness of the outer end portion of the hub wheel 24 is set to be substantially uniform, a wheel bearing device that simultaneously solves the conflicting problems of lightweight, compact and high rigidity of the device is provided. Can do.

  FIG. 4 is a longitudinal sectional view showing a third embodiment of the wheel bearing device with a rotational speed detection device according to the present invention, and FIG. 5 is an enlarged view of a main part showing the detection unit of FIG. This embodiment is basically the same as the first embodiment described above (FIG. 1) except that the configuration of the outer member is partially different, and has the same components and the same functions as the other embodiments described above. Components and parts are denoted by the same reference numerals, and detailed description thereof is omitted.

  This wheel bearing device with a rotational speed detecting device is called a third generation for driven wheels, and includes an inner member 3 composed of a hub wheel 1 and an inner ring 2, and double row rolling elements 4, 4 on the inner member 3. And an outer member 27 that is extrapolated via the.

  The outer member 27 is made of medium-high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, has a vehicle body mounting flange 5c integrally on the outer periphery, and double rows of outer rolling surfaces 5a and 5b on the inner periphery. Are integrally formed.

  The outer member 27 is formed such that the outer side outer rolling surface 5a is larger in diameter than the inner side outer rolling surface 5b in accordance with the difference in pitch circle diameters PCDo and PCDi, and is shown enlarged in FIG. As described above, the shoulder portion 28 of the inner-side outer rolling surface 5b that is the small-diameter side is formed, and the shoulder portion 29 of the outer-side outer rolling surface 5a is formed in a tapered shape from the shoulder portion 28. A sensor mounting hole 17 is formed in the shoulder portion 28 so as to penetrate in the radial direction.

  In the present embodiment, the sensor mounting hole 17 is formed so as to penetrate the outer member 27 in the radial direction so as to open to the cylindrical shoulder 28 avoiding the tapered shoulder 29 of the outer member 27. The processing tool is not tilted or vibrated during processing without being affected by the tapered shoulder 29. Therefore, the mounting hole 17 can be processed with high accuracy.

  The embodiment of the present invention has been described above, but the present invention is not limited to such an embodiment, and is merely an example, and various modifications can be made without departing from the scope of the present invention. Of course, the scope of the present invention is indicated by the description of the scope of claims, and further, the equivalent meanings described in the scope of claims and all modifications within the scope of the scope of the present invention are included. Including.

  The wheel bearing device with a rotation speed detection device according to the present invention can be applied to a third-generation or fourth-generation wheel bearing device in which any type of rotation speed detection device is built in the inner ring rotation structure.

1 is a longitudinal sectional view showing a first embodiment of a wheel bearing device with a rotation speed detection device according to the present invention. It is a principal part enlarged view which shows the detection part of FIG. It is a longitudinal cross-sectional view which shows 2nd Embodiment of the wheel bearing apparatus with a rotational speed detection apparatus which concerns on this invention. It is a longitudinal cross-sectional view which shows 3rd Embodiment of the wheel bearing apparatus with a rotational speed detection apparatus which concerns on this invention. It is a principal part enlarged view which shows the detection part of FIG. It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus with a rotational speed detection apparatus.

Explanation of symbols

1, 24 ················ Hub wheel 1a, 2a ·········· Inner rolling surface 1b ············ Small diameter step 1c ... Serration 1d ... Clamping part 2 ... ... Inner rings 3, 25 ......... Inner member 4 ...... Rolling elements 5, 27 ... ... Outer member 5a ... Outer outer rolling surface 5b ... Inner outer rolling Running surface 5c ... Car body mounting flange 6 ... Wheel mounting flange 6a ...・ ・ ・ ・ Hub bolt 6b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Base 7 ・ ・ ・ ・ ・ ・ ・ ・・ Retainer 8 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer side seal 9 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner side seal 10 ・ ・ ・ ・ ・ ・... Counter part 11,15 ......... Step part 12 ...... Shaft-like parts 13,14,16, 28, 29 ... shoulder 17 ... sensor mounting hole 18 ... rotational speed sensor 19 ... ... Sensor holder 20 ... Connector 21 ... Seal member 22 ... ... Magnetic encoder 23 ... Metal ring 23a ... Small diameter cylindrical part 23b ... ... Standing plate part 23c ...・ ・ ・ Large diameter cylindrical part 26 ・ ・ ・ ・ ・ ・ ・ ・ ・ Recess 51 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ External member 51a ··· Outer rolling surface 51b ... Car body mounting flange 52 ...・ ・ ・ ・ ・ ・ Inner rolling surface 52b ・ ・ ・ ・ ・ ・ ・ ・ Shoulder 52c ・ ・ ・ ・ ・ ・ ・ ・ Small diameter step 53 ・ ・ ・ ・ ・ ・ ・ ・..... Wheel mounting flange 54 ..... Inner ring 55 ..... Ball 56 ... ..... Encoder 56a ..... Large-diameter cylindrical part 56b ..... Small-diameter cylindrical part 57 ........ .... Sensor 57a ..... Mounting hole 58・ ・ ・ ・ ・ ・ ・ ・ ・ Intermediate part 59 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Guide part 60 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Harness PCDi ···························································································· Pitch circle diameter Zi of the outer rolling element row・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Number of rolling elements on inner side Zo ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Number of rolling elements on outer side

Claims (7)

An outer member integrally having a vehicle body mounting flange for being attached to the knuckle on the outer periphery, and an outer rolling surface of a double row integrally formed on the inner periphery;
A wheel mounting flange for mounting a wheel at one end is integrally formed, an inner rolling surface facing one of the double-row outer rolling surfaces on the outer periphery, and an axial portion from the inner rolling surface via A hub wheel formed with a small-diameter step portion extending in the axial direction, and an inner rolling surface that is fitted and fixed to the small-diameter step portion of the hub wheel and that faces the other of the outer rolling surfaces of the double row are formed on the outer periphery. An inner member made of an inner ring or an outer joint member of a constant velocity universal joint,
A double row rolling element row accommodated movably between both rolling surfaces of the inner member and the outer member;
A seal attached to an opening of an annular space formed between the outer member and the inner member;
An encoder disposed on the hub wheel,
A sensor mounting hole is formed by penetrating between the outer rolling surfaces of the double row of the outer member, and a sensor holder is fitted and inserted into the sensor mounting hole.
In the wheel bearing device with a rotational speed detection device in which the rotational speed sensor for detecting the rotational speed of the wheel is embedded in the sensor holder, and the rotational speed sensor is opposed to the encoder via a predetermined radial clearance,
The pitch circle diameters in the double row rolling element rows are set differently on the left and right, and the sensor mounting hole is opened to a cylindrical shoulder portion of the shoulder portions of the outer rolling surface of the double row. A wheel bearing device with a rotational speed detecting device, wherein the wheel bearing device is formed.   The wheel bearing device with a rotational speed detection device according to claim 1, wherein a connector to which a harness is attached is formed integrally with the sensor holder.   The wheel bearing device with a rotation speed detection device according to claim 1 or 2, wherein the sensor holder is positioned and fixed by protruding a predetermined amount from a shoulder portion of the outer member.   A metal ring is fitted and fixed to the shaft-like portion of the hub ring, and the encoder is mixed with the magnetic powder in the elastomer, and is integrally joined to the metal ring by vulcanization and is alternately magnetic poles in the circumferential direction. The wheel bearing device with a rotational speed detection device according to any one of claims 1 to 3, wherein the wheel bearing device includes a magnetic encoder in which N and S are magnetized.   The wheel bearing device with a rotation speed detecting device according to any one of claims 1 to 4, wherein the sensor holder is formed from a nonmagnetic synthetic resin material by injection molding.   The pitch circle diameter of the outer rolling element row of the double row rolling element rows is set to be larger than the pitch circle diameter of the inner rolling element row, and the outer rolling element row rolling element. The wheel bearing device with a rotational speed detection device according to any one of claims 1 to 5, wherein the number is set to be larger than the number of rolling elements in the inner rolling element row.   The rotational speed according to claim 6, wherein a mortar-shaped recess is formed by forging at an outer end portion of the hub wheel, and a thickness of the end portion is set to be substantially uniform corresponding to the recess. Wheel bearing device with detection device.

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