JP2012193768A - Bearing device for wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device for a wheel protecting a magnetic encoder by an exterior seal and having enhanced reliability by enhancing handling properties of the exterior seal.SOLUTION: A sensor holder 18 includes a cylindrical inside diameter part 18e extended from a disk part 18d to an outer side in a shaft direction, the exterior seal 20 is mounted on an annular space formed between the inside diameter part 18e and the small diameter part 5c of an inner wheel 5 and the exterior seal 20 includes a core metal 21 provided with a cylinder part 21a and an upright plate 21b and a seal member 22 pressed in the small diameter part 5c of the inner wheel 5. The seal member 22 integrally has an elastic lip 22a whose tip part is extended to an outer side in the radial direction to be inclined on the inner side and comes in sliding contact with the inside diameter part 18e of the sensor holder 18, the outermost diameter part of the outer seal 20 is the outside diameter of the upright plate part 21b of the core metal 21 and disposed on the inner side of the sensor holder 18 in a diameter larger than the outside diameter of the elastic lip 22a. The surface of the elastic lip 22a is coated with grease.

Description

  The present invention relates to a wheel bearing device in which a wheel such as an automobile is rotatably supported and a sensor holder that seals the inside of the bearing is mounted.

  There is provided a wheel bearing device in which a rotation speed detection device for detecting a rotation speed of a vehicle and controlling an anti-lock brake system (ABS) is incorporated in the bearing while rotatably supporting a vehicle wheel with respect to a suspension device. Generally known. Conventionally, in such a wheel bearing device, a sealing device is provided between an inner member and an outer member that are in rolling contact with a rolling element, and a magnetic encoder in which magnetic poles are alternately arranged in a circumferential direction is provided as the sealing device. It is integrated with. A rotational speed sensor, which is disposed facing this magnetic encoder and detects a change in magnetic pole of the magnetic encoder accompanying the rotation of the wheel, is mounted on a wheel bearing device and then mounted on a knuckle that constitutes a suspension device.

  As an example of such a wheel bearing device, a structure as shown in FIG. 21 is known. The wheel bearing device includes an outer member 50 serving as a fixed wheel, an inner member 51 serving as a rotating wheel, and a plurality of balls 52 accommodated between the outer member 50 and the inner member 51. Yes. The inner member 51 includes a hub ring 53 and an inner ring 54 press-fitted into the hub ring 53.

  The outer member 50 integrally has a vehicle body mounting flange 50b fixed to a knuckle (not shown) constituting a suspension device on the outer periphery, and double row outer rolling surfaces 50a and 50a are integrally formed on the inner periphery. Has been.

  The hub wheel 53 integrally has a wheel mounting flange 55 for mounting a wheel (not shown) at one end, an inner rolling surface 53a on the outer periphery, and a small diameter step extending in the axial direction from the inner rolling surface 53a. A portion 53b is formed, and a serration 53c for torque transmission is formed on the inner periphery. On the other hand, the inner ring 54 has an inner rolling surface 54a formed on the outer periphery, and is press-fitted and fixed to the small diameter step portion 53b.

  A seal 56 and a first sealing seal 57 are attached to the opening of the annular space formed between the outer member 50 and the inner member 51, and the bearing space is sealed. As shown in FIG. 22, the first hermetic seal 57 is configured by a so-called pack seal including a slinger 58 and an annular seal plate 59 that are arranged to face each other. In addition, a magnetic encoder 60 in which magnetic powder such as ferrite is mixed in an elastomer such as rubber and magnetic poles N and S are alternately magnetized in the circumferential direction is integrally vulcanized and bonded to the slinger 58.

  The inner end opening of the outer member 50 is blocked by the sensor case 61. This sensor case 61 is bent inward in the radial direction from a predetermined position on the outer side in the axial direction of the first cylindrical portion 61a, and a first cylindrical portion 61a that is press-fitted and fixed to the outer peripheral surface of the outer member 50. And a second cylindrical portion 61c bent in the same direction as the first cylindrical portion 61a from a predetermined position radially inward of the bottom portion 61b.

  The sensor 62 includes a body 63 housed in the sensor case 61, a detection unit 64 built in the body 63, a take-out unit 65 that extracts a signal from the detection unit 64, and a lead wire 66.

  A small diameter portion 67 is formed on the outer diameter of the inner ring 54, and a second sealing seal 68 is attached between the small diameter portion 67 and the sensor case 61. The second sealing seal 68 includes a cored bar 69 having a cylindrical part 69a press-fitted into the small-diameter part 67 of the inner ring 54, a flange part 69b bent radially outward from the cylindrical part 69a, and the cored bar 69. And an elastic member 70 joined by vulcanization adhesion. The elastic member 70 is provided with two sealing lips 70 a and 70 b and is in sliding contact with the second cylindrical portion 61 c of the sensor case 61.

  Here, a sealing space I is provided between the ball 52 on the vehicle center side and the first sealing seal 57, and a sealing space II is provided between the first sealing seal 57 and the second sealing seal 68. Since the magnetic encoder 60 is arranged in the space I and the sensor 62 is arranged in the second sealed space II, it has sealing durability against foreign matter intrusion into the detection unit and is detected in the state of the wheel bearing device. It is possible to provide a wheel bearing device that can easily manage the gap size between the magnetic encoder 60 and the sensor 62 in the unit 64 and can also perform a rotation speed signal inspection (see, for example, Patent Document 1).

JP 2009-24732 A

  However, such conventional wheel bearing devices have the following problems. First, in the second seal 68, when the grease is applied to the seal lips 70a and 70b, the seal lips 70a and 70b have the outermost diameter. Management of the coating amount becomes difficult. It is possible to take a packaging method in which the seal lips 70a and 70b do not come into contact with the packaging material, but the cost becomes higher due to a special packaging method.

  Further, since the seal lips 70a and 70b have the outermost diameter, it is difficult to grab the seal outer diameter side and put it into the assembly equipment and transport it, and the assembly equipment is limited.

  Further, when the second sealing seal 68 is installed, the grease applied to the seal lips 70a and 70b is scraped off by the second cylindrical portion 61c of the sensor case 61, and the grease adheres to the sensor case 61, and the foreign matter is removed. Not only does it easily adhere to the grease, but the appearance quality is also reduced.

  The present invention has been made in view of such circumstances, and protects the magnetic encoder by mounting an exterior seal between the sensor holder and the inner ring, and improves the handleability of the exterior seal to improve reliability. An object of the present invention is to provide a wheel bearing device.

  In order to achieve such an object, the invention according to claim 1 of the present invention has a vehicle body mounting flange integrally attached to the knuckle constituting the suspension device on the outer periphery, and double row outer rolling on the inner periphery. A hub wheel having an integrally formed outer member, a wheel mounting flange for mounting a wheel at one end, and a small-diameter step portion extending in the axial direction on the outer periphery, and the hub wheel An inner member comprising at least one inner ring press-fitted into a small-diameter step portion, and having an outer periphery formed with a double-row inner rolling surface opposite to the double-row outer rolling surface, the inner member and the outer member A double row rolling element housed in a freely rolling manner between the respective rolling surfaces of the side member, and a magnetic encoder externally fitted to the inner ring, and formed between the outer member and the inner member. A seal is attached to the opening of the annular space, and the outer portion In a wheel bearing device in which a sensor holder is fitted to the inner side end of the motor, a rotational speed sensor is mounted on the sensor holder, and is arranged to face the magnetic encoder via a predetermined air gap, the sensor holder A cylindrical fitting portion that is formed into a cup shape by pressing from a steel plate and is press-fitted into the outer periphery of the end portion of the outer member, and extends radially inward from the fitting portion, and the inner member of the outer member A flange that is in close contact with the side end surface, a cylindrical portion that extends in the axial direction from the flange, a disc portion that extends radially inward from the cylindrical portion, and a cylindrical shape that extends from the circular portion to the axially outer side An outer seal is attached to an annular space formed between the inner diameter portion and the outer diameter portion of the inner ring, the detection portion of the rotational speed sensor is sealed, and the outer seal is Pressure is applied to the outer diameter of the inner ring Comprising a cored bar having a cylindrical part formed thereon and a standing plate part extending radially outward from the cylindrical part, and a seal member integrally joined to the cored bar by vulcanization adhesion. An elastic lip integrally extending in a radially outward direction and in sliding contact with an inner diameter portion of the sensor holder via a predetermined radial shimoshiro, and the outer diameter of the outermost diameter portion of the exterior seal being the elastic lip The outer diameter of the elastic lip is formed, and grease is previously applied to the surface of the elastic lip.

  As described above, the magnetic encoder that is externally fitted to the inner ring is provided, the seal is attached to the opening of the annular space formed between the outer member and the inner member, and the inner end of the outer member In the inner ring rotation type wheel bearing device in which the sensor holder is fitted to the inner part, the rotation speed sensor is mounted on the sensor holder, and the magnetic encoder is disposed to face the sensor through a predetermined air gap, the sensor holder is pressed from the steel plate. A cylindrical fitting part that is formed into a cup shape by processing and is press-fitted into the outer periphery of the end part of the outer member, and extends radially inward from the fitting part, and is in close contact with the inner end face of the outer member A flange portion, a cylindrical portion extending in the axial direction from the flange portion, a disc portion extending radially inward from the cylindrical portion, and a cylindrical inner diameter portion extending from the disc portion to the axially outer side. This inner diameter part and the outer diameter part of the inner ring An outer space seal is attached to the annular space formed between them, and the detection portion of the rotational speed sensor is sealed, and the outer surface seal is press-fitted into the outer diameter portion of the inner ring, and a radially outer portion from the cylindrical portion. And a seal member integrally joined to the metal core by vulcanization adhesion. The seal member extends obliquely outward in the radial direction, and the sensor holder An elastic lip that is slidably in contact with the inner diameter portion via a predetermined radial shimoshiro is integrally formed, and the outer diameter of the outermost diameter portion of the exterior seal is formed larger than the outer diameter of the elastic lip, and the elastic lip Since the grease is applied to the surface of the product in advance, the grease can adhere to the packing material, or the seal outer diameter side can be grabbed in the assembly process and loaded into the assembly equipment for transport. Equipment is never restrictedTherefore, it is possible to provide a wheel bearing device in which the handleability of the exterior seal is improved and the reliability is improved.

  Further, as in the invention described in claim 2, the outermost diameter portion of the exterior seal is the outer diameter of the standing plate portion of the cored bar, and this standing plate portion is disposed on the inner side of the sensor holder. In addition, if the elastic lip extends radially outward and the tip is inclined toward the inner side, the exterior seal can be attached after the sensor holder is attached to the outer member, and the assembly workability is improved. When the exterior seal is attached, the elastic lip can be prevented from being reversed and swallowed.

  Further, as in the invention described in claim 3, the outermost diameter portion of the exterior seal is the outer diameter of the standing plate portion of the core metal, and this standing plate portion is disposed on the inner side of the sensor holder. In addition, if the elastic lip extends radially outwardly with the tip inclined to the outer side and is formed to be short in the radial direction and long in the axial direction, the elastic lip is elastic when press-fitted into the outer diameter portion of the inner ring. It is possible to prevent the lip from coming into contact with the inner diameter portion of the sensor holder and to improve the sealing performance as the width of the contact portion is increased.

  According to a fourth aspect of the present invention, there is integrally provided an elastic lip that extends from the outer end portion of the upright portion of the metal core so as to incline radially outward, and this elastic lip is formed on the sensor holder. The disc portion may be slidably contacted with a predetermined axial direction shishiro, and the elastic lip is integrated with the outer end portion of the upright portion of the cored bar as in the invention of claim 5. The elastic lip may be opposed to the disk portion of the sensor holder via a slight axial clearance, and a labyrinth seal may be formed. Thereby, sealing performance can be improved further.

  Further, as in the sixth aspect of the present invention, an elastic lip is integrally joined to the outer end portion of the upright plate portion of the metal core, and is elastically contacted to the shoulder portion of the outer joint member constituting the constant velocity universal joint. In addition, if the labyrinth seal is formed so as to face the disc portion of the sensor holder through a slight axial clearance, the sealing performance can be further improved.

  Further, as in the invention according to claim 7, the outermost diameter portion of the exterior seal is the outer diameter of the standing plate portion of the core metal, and the standing plate portion is disposed on the outer side of the sensor holder. At the same time, if the elastic lip extends outwardly in the radial direction with the tip inclined to the inner side and a chamfered portion is formed at the end of the inner diameter portion of the sensor holder, the outer seal of the exterior seal is attached when the sensor holder is mounted. It is possible to prevent the elastic lip from being reversed and swallowed.

  Further, as in the invention described in claim 8, the inner diameter portion of the sensor holder is formed on a tapered surface that gradually increases in diameter toward the outer side, and the inner diameter on the smaller diameter side of the inner diameter portion is a core metal stand of the outer seal. As long as the inner diameter of the inner diameter portion is set to be larger than the outer diameter of the elastic lip of the exterior seal, the outer diameter of the plate portion is set smaller than the outer diameter of the plate portion. It is possible to prevent the elastic lip from dripping.

  Further, as in the invention described in claim 9, minute irregularities are formed by shot blasting on the surface of the inner diameter part and the disk part of the sensor holder with which the elastic lip of the exterior seal is in sliding contact, and the surface roughness Is set to Ra 1.6 or less, the lubricity on the sliding surface is improved, the lip sliding resistance is reduced, and the rotational torque can be reduced.

  Further, the invention according to claim 10 of the present invention has a vehicle body mounting flange integrally attached to the knuckle constituting the suspension device on the outer periphery, and a double row outer rolling surface is integrally formed on the inner periphery. A hub wheel having a wheel mounting flange for mounting a wheel at one end and a small-diameter step portion extending in the axial direction on the outer periphery, and press-fitting into the small-diameter step portion of the hub ring An inner member formed of at least one inner ring formed on the outer periphery and formed with a double-row inner rolling surface facing the double-row outer rolling surface, and each of the inner member and the outer member. An annular space formed between the outer member and the inner member, comprising a double row rolling element housed between the rolling surfaces so as to be freely rollable, and a magnetic encoder fitted to the inner ring. A seal is attached to the opening, and the inner side of the outer member In a wheel bearing device in which a sensor holder is fitted to an end, a rotational speed sensor is mounted on the sensor holder, and the magnetic encoder is disposed to face the sensor through a predetermined air gap, the sensor holder is pressed from a steel plate. A cylindrical fitting portion that is formed in a cup shape and is press-fitted into the outer periphery of the end portion of the outer member, and extends radially inward from the fitting portion to the inner end surface of the outer member. An intimate collar part, a cylindrical part extending axially from the collar part, a disk part extending radially inward from the cylindrical part, and a cylindrical inner diameter part extending axially outward from the disk part An exterior seal is mounted in an annular space formed between the inner diameter portion and the outer diameter portion of the inner ring, the detection portion of the rotational speed sensor is sealed, and the exterior seal is attached to the sensor holder. Press-fitted into the inner diameter A cored bar having a cylindrical part and a vertical plate part extending radially inward from the cylindrical part, and a seal member integrally bonded to the cored bar by vulcanization adhesion, the seal member being radially An elastic lip that extends inwardly and slidably contacts with the outer diameter portion of the inner ring via a predetermined radial shimeshiro, and the inner diameter of the outermost diameter portion of the exterior seal is larger than the inner diameter of the elastic lip. In addition to being formed with a small diameter, grease is previously applied to the surface of the elastic lip.

  As described above, the magnetic encoder that is externally fitted to the inner ring is provided, the seal is attached to the opening of the annular space formed between the outer member and the inner member, and the inner end of the outer member In the inner ring rotation type wheel bearing device in which the sensor holder is fitted to the inner part, the rotation speed sensor is mounted on the sensor holder, and the magnetic encoder is disposed to face the sensor through a predetermined air gap, the sensor holder is pressed from the steel plate. A cylindrical fitting part that is formed into a cup shape by processing and is press-fitted into the outer periphery of the end part of the outer member, and extends radially inward from the fitting part, and is in close contact with the inner end face of the outer member A flange portion, a cylindrical portion extending in the axial direction from the flange portion, a disc portion extending radially inward from the cylindrical portion, and a cylindrical inner diameter portion extending from the disc portion to the axially outer side. This inner diameter part and the outer diameter part of the inner ring An outer space seal is attached to the annular space formed between them, the detection portion of the rotation speed sensor is sealed, and the outer surface seal is press-fitted into the inner diameter portion of the sensor holder, and the cylindrical portion is radially inward from the cylindrical portion. And a seal member integrally joined to the metal core by vulcanization adhesion. The seal member extends inwardly in the radial direction and extends outside the inner ring. An elastic lip that is slidably contacted with the diameter portion via a predetermined radial shimoshi is integrally formed, and the inner diameter of the outermost inner diameter portion of the exterior seal is formed to be smaller than the inner diameter of the elastic lip. Since the grease is applied, the grease can be attached to the packing material, or the outer diameter side of the seal can be grabbed and transferred to the assembly equipment in the assembly process, so the assembly equipment is limited as before. NeverTherefore, it is possible to provide a wheel bearing device in which the handleability of the exterior seal is improved and the reliability is improved. In addition, the exterior seal may be press-fitted and fixed in advance to the inner diameter portion of the sensor holder, and then the sensor holder may be attached to the outer member, or after the sensor holder is attached to the outer member, An exterior seal may be press-fitted into the part, increasing the degree of freedom in assembly and improving the assembly workability.

  Further, as in the invention described in claim 11, the outer diameter portion of the inner ring is formed with a step, and the slinger constituting the inner side seal is press-fitted into the large diameter portion, and the magnetic encoder is inserted into the slinger. The outer seal may be attached to the small diameter portion and the inner diameter portion of the sensor holder.

  Further, as in the invention according to claim 12, the innermost diameter portion of the exterior seal is an inner diameter of the standing plate portion of the core metal, and the standing plate portion is disposed on the inner side of the sensor holder, If the elastic lip extends inward in the radial direction and the tip is inclined toward the inner side, the elastic lip can be prevented from being inverted and swollen when the exterior seal is attached.

  Further, as in the invention described in claim 13, the innermost diameter portion of the exterior seal is the inner diameter of the standing plate portion of the core metal, and the standing plate portion is disposed on the inner side of the sensor holder, If the elastic lip extends outwardly in the radial direction with the tip inclined to the outer side, and is formed to be short in the radial direction and long in the axial direction, the elastic lip can be used when the outer seal is pressed into the inner diameter portion of the sensor holder. It is possible to prevent the inner ring from coming into contact with the outer diameter portion and to improve the sealing performance as the width of the contact portion is increased.

  Further, as in the invention described in claim 14, an elastic lip integrally extending from the inner end portion of the upright portion of the cored bar inclining radially inward is formed, and this elastic lip is a large portion of the inner ring. The end face may be elastically contacted via a predetermined axial squeezing, and an elastic lip is integrally provided at the inner end of the upright portion of the core metal as in the invention described in claim 15. The elastic lip may be opposed to the large end surface of the inner ring via a slight axial clearance to form a labyrinth seal. Thereby, sealing performance can be improved further.

  Further, as in the invention described in claim 16, if the sensor holder is formed by press working from a non-magnetic austenitic stainless steel plate, the magnetic flux flow path is not affected, and the detection accuracy is improved. It has excellent corrosion resistance and can improve durability over a long period of time.

  Further, as in the invention described in claim 17, an annular locking portion that protrudes radially inward from the inner diameter portion of the sensor holder may be provided.

  A wheel bearing device according to the present invention has a vehicle body mounting flange integrally attached to a knuckle constituting a suspension device on an outer periphery, and an outer side in which a double row outer rolling surface is integrally formed on an inner periphery. And a hub wheel integrally having a wheel mounting flange for mounting a wheel at one end thereof and having a small-diameter step portion extending in the axial direction on the outer periphery, and at least one press-fitted into the small-diameter step portion of the hub ring An inner member formed of two inner rings and formed on the outer periphery with a double row inner rolling surface facing the outer row rolling surface of the double row, and between the respective rolling surfaces of the inner member and the outer member And a magnetic encoder that is externally fitted to the inner ring, and seals an opening in an annular space formed between the outer member and the inner member. Is attached to the inner end of the outer member. In a wheel bearing device in which a holder is fitted, a rotation speed sensor is mounted on the sensor holder, and is arranged to face the magnetic encoder via a predetermined air gap, the sensor holder is cup-shaped by pressing from a steel plate. A cylindrical fitting portion that is press-fitted into the outer periphery of the end portion of the outer member, and a flange portion that extends radially inward from the fitting portion and closely contacts the inner end surface of the outer member. A cylindrical portion extending in the axial direction from the flange portion, a disc portion extending radially inward from the cylindrical portion, and a cylindrical inner diameter portion extending from the disc portion to the axially outer side, An exterior seal is mounted in an annular space formed between the inner diameter portion and the outer diameter portion of the inner ring, the detection portion of the rotational speed sensor is sealed, and the outer seal is press-fitted into the outer diameter portion of the inner ring. Cylinder part and this cylinder And a seal member integrally joined to the metal core by vulcanization adhesion, and the seal member extends in a radially outward direction. And an elastic lip that is slidably in contact with the inner diameter portion of the sensor holder via a predetermined radial shimoshiro, and the outer diameter of the outermost diameter portion of the exterior seal is formed larger than the outer diameter of the elastic lip. At the same time, since the grease is pre-applied to the surface of the elastic lip, the grease adheres to the packing material, or the outer diameter side of the seal can be grabbed in the assembling process, and can be put into the assembling equipment and transported. Therefore, the assembly equipment is not limited as in the prior art. Therefore, it is possible to provide a wheel bearing device in which the handleability of the exterior seal is improved and the reliability is improved.

  Further, the wheel bearing device according to the present invention integrally has a vehicle body mounting flange to be attached to the knuckle constituting the suspension device on the outer periphery, and a double row outer rolling surface is integrally formed on the inner periphery. A hub wheel having an outer member and a wheel mounting flange for mounting a wheel at one end integrally, a small-diameter step portion extending in the axial direction on the outer periphery, and a small-diameter step portion of the hub wheel are press-fitted An inner member comprising at least one inner ring and formed on the outer periphery with a double row inner rolling surface facing the double row outer rolling surface, and each of the inner member and the outer member rolling. An opening in an annular space formed between the outer member and the inner member, comprising a double-row rolling element housed between the surfaces so as to be freely rollable, and a magnetic encoder fitted on the inner ring. A seal is attached to the inner member, and an end portion on the inner side of the outer member In a wheel bearing device in which a sensor holder is fitted and a rotational speed sensor is mounted on the sensor holder and is disposed to face the magnetic encoder via a predetermined air gap, the sensor holder is cupped by pressing from a steel plate. A cylindrical fitting portion that is press-fitted into the outer periphery of the end portion of the outer member, and extends inward in the radial direction from the fitting portion, and is in close contact with the inner end surface of the outer member. A cylindrical portion extending in the axial direction from the flange portion, a disk portion extending radially inward from the cylindrical portion, and a cylindrical inner diameter portion extending axially outward from the disk portion, An exterior seal is mounted in an annular space formed between the inner diameter portion and the outer diameter portion of the inner ring, the detection portion of the rotational speed sensor is sealed, and the outer seal is attached to the inner diameter portion of the sensor holder. Pressed cylinder And a metal core having a standing plate extending radially inward from the cylindrical portion, and a seal member integrally joined to the metal core by vulcanization adhesion. And an elastic lip that is slidably in contact with the outer diameter portion of the inner ring through a predetermined radial shimishi, and the inner diameter of the outermost inner diameter portion of the exterior seal is smaller than the inner diameter of the elastic lip. In addition, grease is applied to the surface of the elastic lip in advance, so that the grease adheres to the packing material, or the outer diameter side of the seal can be grabbed in the assembling process and loaded into assembling equipment. Therefore, the assembly equipment is not limited as in the prior art. Therefore, it is possible to provide a wheel bearing device in which the handleability of the exterior seal is improved and the reliability is improved. In addition, the exterior seal may be press-fitted and fixed in advance to the inner diameter portion of the sensor holder, and then the sensor holder may be attached to the outer member, or after the sensor holder is attached to the outer member, An exterior seal may be press-fitted into the part, increasing the degree of freedom in assembly and improving the assembly workability.

It is a longitudinal section showing a 1st embodiment of a bearing device for wheels concerning the present invention. It is a principal part enlarged view which shows the detection part of FIG. It is a principal part enlarged view which shows the modification of the exterior seal | sticker of FIG. It is the elements on larger scale of the exterior seal | sticker of FIG. It is a principal part enlarged view which shows the modification of the exterior seal | sticker of FIG. It is a principal part enlarged view which shows the modification of the exterior seal | sticker of FIG. It is a principal part enlarged view which shows the other modification of the exterior seal | sticker of FIG. It is a principal part enlarged view which shows the modification of the exterior seal | sticker of FIG. It is a principal part enlarged view which shows the modification of the exterior seal | sticker of FIG. It is a longitudinal cross-sectional view which shows 2nd Embodiment of the wheel bearing apparatus which concerns on this invention. It is a principal part enlarged view which shows the detection part of FIG. (A) is sectional drawing which shows the exterior seal single-piece | unit of FIG. 11, (b) is sectional drawing which shows the modification of the sensor holder of FIG. It is a longitudinal cross-sectional view which shows 3rd Embodiment of the wheel bearing apparatus which concerns on this invention. It is a principal part enlarged view which shows the detection part of FIG. It is a principal part enlarged view which shows the modification of the exterior seal | sticker of FIG. It is the elements on larger scale of FIG. It is a principal part enlarged view which shows the modification of the exterior seal | sticker of FIG. It is a principal part enlarged view which shows the other modification of the exterior seal | sticker of FIG. It is a principal part enlarged view which shows the modification of the exterior seal | sticker of FIG. It is a principal part enlarged view which shows the other modification of the exterior seal | sticker of FIG. It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus. It is a principal part enlarged view which shows the detection part of FIG.

  An outer member that integrally has a vehicle body mounting flange to be attached to a knuckle constituting a suspension device on the outer periphery, and an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and a wheel on one end A hub wheel having a wheel mounting flange integrally formed and having an inner rolling surface facing the outer rolling surface of the double row on the outer periphery and a small-diameter step portion extending in the axial direction from the inner rolling surface. And an inner member formed of an inner ring press-fitted into the small diameter step portion of the hub wheel and formed with the other inner rolling surface facing the outer rolling surface of the double row, and the inner member and the outer side. A double-row rolling element housed between the rolling surfaces of the member so as to be freely rollable, and a magnetic encoder externally fitted to the inner ring, and formed between the outer member and the inner member. A seal is attached to the opening of the annular space and the inner of the outer member In a wheel bearing device in which a sensor holder is fitted to the end of the wheel and a rotational speed sensor is mounted on the sensor holder and disposed opposite to the magnetic encoder via a predetermined air gap, the sensor holder is non-magnetic. A cylindrical fitting portion that is formed into a cup shape by pressing from an austenitic stainless steel plate and is press-fitted into the outer periphery of the end portion of the outer member, and extends radially inward from the fitting portion, and the outer member A flange portion that is in close contact with the end surface on the inner side of the first cylindrical portion, a cylindrical portion that extends in the axial direction from the flange portion, a disk portion that extends radially inward from the cylindrical portion, and an axially outer side that extends from the circular plate portion. A cylindrical inner diameter portion, and an exterior seal is mounted in an annular space formed between the inner diameter portion and the small diameter portion of the inner ring, the detection portion of the rotational speed sensor is sealed, and the exterior seal , A core having a cylindrical portion press-fitted into the large-diameter portion of the inner ring, and a standing plate portion extending radially outward from the cylindrical portion, and a seal integrally joined to the core by vulcanization adhesion The seal member is formed integrally with an elastic lip that extends radially outwardly with a tip extending obliquely toward the inner side, and is in sliding contact with the inner diameter portion of the sensor holder via a predetermined radial shimiro, The outermost diameter portion of the exterior seal is the outer diameter of the upright plate portion of the core metal, and the upright plate portion is disposed on the inner side of the sensor holder, and the outer diameter of the upright plate portion is set to the elastic lip. The outer diameter is larger than the outer diameter, and grease is previously applied to the surface of the elastic lip.

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 according to the present invention, FIG. 2 is an enlarged view of a main part showing a detection unit of FIG. 1, and FIG. 4 is a partially enlarged view of the exterior seal shown in FIG. 3, FIG. 5 is an enlarged view of a relevant portion showing a modified example of the exterior seal shown in FIG. 3, and FIG. 6 is an exterior view shown in FIG. FIG. 7 is an enlarged view of a main part showing another modification of the exterior seal of FIG. 5, and FIG. 8 is an enlarged view of a main part showing a modification of the exterior seal of FIG. FIG. 9 is an enlarged view of a main part showing a modification of the exterior seal 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 is for a drive wheel referred to as a third generation, and is a double row rolling element housed in a freely rollable manner between the inner member 1, outer member 2, and both members 1 and 2. (Balls) 3 and 3. The inner member 1 includes a hub ring 4 and an inner ring 5 press-fitted into the hub ring 4 through a predetermined shimiro.

  The outer member 2 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and integrally has a vehicle body mounting flange 2b for mounting to a knuckle (not shown) on the outer periphery. Double row outer rolling surfaces 2a, 2a are integrally formed. These double-row outer raceway surfaces 2a and 2a are formed with a hardened layer having a surface hardness of 58 to 64 HRC by induction hardening.

  The hub wheel 4 integrally has a wheel mounting flange 6 for mounting a wheel (not shown) at an end portion on the outer side, and hub bolts 7 are implanted at circumferentially equidistant positions of the wheel mounting flange 6. Yes. Further, an inner side rolling surface 4a facing one side (outer side) of the double row outer side rolling surfaces 2a, 2a and a small-diameter step portion 4b extending in the axial direction from the inner side rolling surface 4a are formed on the outer periphery, A serration (or spline) 4c for torque transmission is formed on the inner periphery.

  On the other hand, the inner ring 5 is formed on the outer periphery with an inner rolling surface 5a facing the other (inner side) of the double row outer rolling surfaces 2a, 2a, and a small-diameter step portion 4b of the hub wheel 4 via a predetermined shimoshiro. It is press-fitted.

  Between the double row outer rolling surfaces 2a, 2a of the outer member 2 and the double row inner rolling surfaces 4a, 5a facing these, the double row rolling elements 3, 3 are respectively accommodated, and the cage 8 , 8 are held so as to roll freely. Further, seals 9 and 10 are attached to the opening of the annular space formed between the outer member 2 and the inner member 1, and leakage of the lubricating grease sealed inside the bearing and the inside of the bearing from the outside. Prevents intrusion of rainwater and dust.

  Further, in the present embodiment, a sensor holder 18 (described later) is fitted to the inner end of the outer member 2 to close the inner seal 10. A rotation speed sensor 19 is attached to the sensor holder 18.

  The hub wheel 4 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and extends from the inner rolling surface 4a to the small diameter step portion 4b from the base portion 6a on the inner side of the wheel mounting flange 6. Thus, the surface hardness is set to a range of 58 to 64 HRC by induction hardening. Not only the wear resistance of the base portion 6a which becomes the seal land portion of the seal 9 is improved, but also has sufficient mechanical strength against the rotational bending load applied to the wheel mounting flange 6, and the durability of the hub wheel 4 Will improve. The inner ring 5 and the rolling element 3 are made of high carbon chrome bearing steel such as SUJ2, and are hardened in the range of 58 to 64 HRC to the core portion by quenching.

  The seal 9 on the outer side of the seals 9 and 10 includes a core metal 11 press-fitted into the inner periphery of the outer side end portion of the outer member 2 via a predetermined shimiro, and a seal member joined to the core metal 11. It is comprised by the integral seal | sticker which consists of 12. The core metal 11 is formed by press-working a cold-rolled steel plate (JIS standard SPCC system or the like).

  On the other hand, the seal member 12 is made of a synthetic rubber such as NBR (acrylonitrile-butadiene rubber), and extends inclining radially outward, and is in slidable contact with the side surface on the inner side of the wheel mounting flange 6 via a predetermined shimiro. 12a, a dust strip 12b extending in a radially outward direction on the inner diameter side, and in sliding contact with a base portion 6a having a circular section in a predetermined axial direction, and inclined inward of the bearing And has a grease lip 12c slidably in contact with the base portion 6b via a predetermined radial shimiro. In addition to the exemplified NBR, the material of the seal member 12 includes, for example, HNBR (hydrogenated acrylonitrile butadiene rubber), EPDM (ethylene propylene rubber), etc., which have excellent heat resistance, and heat resistance and chemical resistance. Examples thereof include ACM (polyacrylic rubber), FKM (fluororubber), and silicon rubber, which are excellent in the above.

  Further, as shown in an enlarged view in FIG. 2, the inner side seal 10 is constituted by a so-called pack seal composed of a slinger 13 and an annular seal plate 14 arranged to face each other. The slinger 13 is formed into a substantially L-shaped cross section by pressing from a ferromagnetic steel plate, for example, a ferritic stainless steel plate (JIS standard SUS430 series, etc.) or a rust-proof cold rolled steel plate. The cylindrical portion 13a is press-fitted into the large-diameter portion 5b of the inner ring 5, and the upright plate portion 13b extends radially outward from the cylindrical portion 13a.

  A magnetic encoder 15 in which a magnetic powder such as ferrite is mixed in an elastomer such as rubber is integrally vulcanized and bonded to the inner side surface of the standing plate portion 13b. The magnetic encoder 15 is magnetized with magnetic poles N and S alternately in the circumferential direction, and constitutes a rotary encoder for detecting the rotational speed of the wheel.

  On the other hand, the seal plate 14 includes a cored bar 16 fitted into the end of the outer member 2 and a seal member 17 integrally joined to the cored bar 16 by vulcanization adhesion. The core metal 16 has a substantially L-shaped cross section by press working from an austenitic stainless steel plate (JIS standard SUS304 type or the like) or a cold-rolled steel plate treated with rust prevention.

  The seal member 17 is made of a synthetic rubber such as NBR, and includes a side lip 17a extending obliquely outward in the radial direction, and a grease lip 17b and a dust lip 17c formed in a bifurcated shape on the inner diameter side. The side lip 17a is in sliding contact with the outer side surface of the standing plate portion 13b of the slinger 13 via a predetermined axial shimiro, and the grease lip 17b and the dust lip 17c are slid against the cylindrical portion 13a via the radial shimiro. It touches.

  Further, the outer edge of the magnetic encoder 15 and the seal plate 14 are opposed to each other through a predetermined radial clearance to form a labyrinth seal Sr. In addition to the exemplified NBR, examples of the material of the seal member 17 include ACM, FKM, or silicon rubber having excellent heat resistance and chemical resistance, such as HNBR and EPDM having excellent heat resistance. can do.

  In addition, although the wheel bearing apparatus comprised by the double row angular contact ball bearing which used the ball for the rolling element 3 was illustrated here, it is not restricted to this, The double row tapered roller bearing which used the tapered roller for the rolling element 3 It may consist of. In addition, here, the third generation structure in which the inner rolling surface 4a is directly formed on the outer periphery of the hub wheel 4 is illustrated, but although not illustrated, a drive wheel second generation structure may be used.

  The sensor holder 18 attached to the inner side end of the outer member 2 is formed into a cup shape by pressing from a nonmagnetic austenitic stainless steel plate. The sensor holder 18 includes a cylindrical fitting portion 18 a that is press-fitted into the outer periphery of the end portion of the outer member 2, and extends radially inward from the fitting portion 18 a, and the inner end surface 2 c of the outer member 2. A flange portion 18b closely contacting the cylindrical portion, a cylindrical portion 18c extending in the axial direction from the flange portion 18b, a disk portion 18d extending radially inward from the cylindrical portion 18c, and an axially outer side from the disk portion 18d. And a cylindrical inner diameter portion 18e.

  The detection unit 19a of the rotational speed sensor 19 is disposed to face the magnetic encoder 15 via a predetermined air gap (axial clearance). Such a stepped shape of the sensor holder 18 increases the rigidity, can suppress deformation due to flying stones, etc., and the sensor holder 18 is non-magnetic so that it does not affect the flow path of the magnetic flux, has excellent corrosion resistance, and is long. The durability can be improved over a period of time.

  Here, in the present embodiment, the exterior seal 20 is mounted in an annular space formed between the inner diameter portion 18e of the sensor holder 18 and the outer diameter portion of the inner ring 5. Specifically, the outer diameter of the inner ring 5 is stepped, the slinger 13 constituting the inner-side seal 10 is fitted on the large diameter portion 5b, and the exterior seal 20 is fitted on the small diameter portion 5c. ing.

  The exterior seal 20 includes a core metal 21 attached to the small-diameter portion 5c and a seal member 22 integrally joined to the core metal 21 by vulcanization adhesion. The metal core 21 is formed of a cylindrical portion 21a formed into a substantially L-shaped section by press working from an austenitic stainless steel plate or a cold-rolled cold-rolled steel plate, and is press-fitted into the small diameter portion 5c. And a standing plate portion 21b extending radially outward from the portion 21a.

  On the other hand, the seal member 22 is made of a synthetic rubber such as NBR, and integrally has an elastic lip 22a extending radially inwardly with a tip inclined toward the inner side. The elastic lip 22a is in sliding contact with the inner diameter portion 18e of the sensor holder 18 via a predetermined radial shimiro. Here, the outermost diameter portion of the outer seal 20, that is, the outer diameter Db of the standing plate portion 21 b of the core metal 21 is larger than the inner diameter Da (the outer diameter of the elastic lip 22 a) of the inner diameter portion 18 e of the sensor holder 18. (Db> Da). And the grease is previously apply | coated to the surface of the elastic lip 22a.

  In the present embodiment, the outermost diameter portion of the exterior seal 20 becomes the standing plate portion 21b of the cored bar 21, and the exterior seal 20 can be attached after the sensor holder 18 is attached to the outer member 2, so that the assembly workability is improved. In addition to the improvement, since the grease is applied to the elastic lip 22a which is not the outermost diameter portion, the grease adheres to the packing material, and the outer diameter side of the seal is grasped in the assembling process and is loaded into the assembling equipment and conveyed. Therefore, the assembly equipment is not limited as in the prior art. Therefore, it is possible to provide a wheel bearing device in which the handleability of the exterior seal 20 is improved and the reliability is improved.

  FIG. 3 is a modification of the above-described exterior seal 20. The exterior seal 20 'basically differs from the above-described exterior seal 20 only in the shape of the elastic lip 22a, and the same reference numerals are given to other identical parts, and detailed description thereof is omitted.

  The exterior seal 20 'includes a core metal 21 attached to the small diameter portion 5c, and a seal member 22' integrally joined to the core metal 21 by vulcanization adhesion. The seal member 22 ′ is made of synthetic rubber such as NBR, and integrally has an elastic lip 22 b extending radially outwardly with the tip inclined to the outer side. The elastic lip 22b is in sliding contact with the inner diameter portion 18e of the sensor holder 18 via a predetermined radial squeeze. And the grease is previously apply | coated to the surface of the elastic lip 22b.

  In the present embodiment, the elastic lip 22b of the exterior seal 20 ′ is formed to be inclined toward the outer side, and as shown in an enlarged view in FIG. 4, is shorter in the radial direction than the elastic lip 22a described above, It is formed so as to be long in the direction and the width A of the contact portion is long. This prevents the elastic lip 22b from coming into contact with the inner diameter portion 18e of the sensor holder 18 when the outer seal 20 ′ is press-fitted into the small diameter portion 5c of the inner ring 5, and the width A of the contact portion is increased. Therefore, the sealing performance can be improved.

  An exterior seal 23 shown in FIG. 5 is a modification of the exterior seal 20 '(FIG. 3) described above. The exterior seal 23 is obtained by adding an elastic lip 24a to the exterior seal 20 'described above. The same reference numerals are given to other identical parts, and detailed description thereof is omitted.

  The exterior seal 23 includes a cored bar 21 attached to the small-diameter portion 5c, and a seal member 24 integrally joined to the cored bar 21 by vulcanization adhesion. The seal member 24 is made of a synthetic rubber such as NBR, and has an elastic lip 22b that extends radially outwardly with its tip inclined toward the outer side, and is inclined radially outward from the outer end of the upright portion 21b of the cored bar 21. And an elastic lip 24a extending integrally. The elastic lip 24a is in sliding contact with the disk portion 18d of the sensor holder 18 via a predetermined axial squeeze. And the grease is not applied to the surface of the elastic lip 24a which is the outermost diameter portion of the exterior seal 23, but the grease is previously applied only to the surface of the elastic lip 22b.

  As a result, as in the above-described embodiment, grease can adhere to the packaging material, or the outer diameter side of the seal can be grasped in the assembling process, and can be loaded and transported to the assembling facility. Thus, the reliability can be improved and the sealing performance can be improved by the addition of the elastic lip 24a.

  An exterior seal 25 shown in FIG. 6 is a modification of the above-described exterior seal 23 (FIG. 5). The exterior seal 25 is basically different only in the shape of the elastic lip 24a described above, and the same reference numerals are given to other identical portions, and detailed description thereof is omitted.

  The exterior seal 25 includes a cored bar 21 attached to the small-diameter portion 5c and a seal member 26 integrally joined to the cored bar 21 by vulcanization adhesion. The seal member 26 is made of a synthetic rubber such as NBR, and has an elastic lip 22b that extends radially outwardly with its tip inclined toward the outer side, and an elastic lip 26a that is joined to the outer end of the upright portion 21b of the core metal 21. Is integrated. The elastic lip 26a is opposed to the disk portion 18d of the sensor holder 18 through a slight axial clearance, and constitutes a labyrinth seal Sr. And the grease is not applied to the surface of the elastic lip 26a which is the outermost diameter portion of the exterior seal 25, but the grease is previously applied only to the surface of the elastic lip 22b.

  As a result, as in the above-described embodiment, grease can adhere to the packing material, and the outer diameter side of the seal can be grasped in the assembling process to be loaded and transported to the assembling facility, improving the handleability of the exterior seal 25. Thus, the reliability can be improved, and the sealing performance can be improved without increasing the seal torque by the addition of the elastic lip 26a.

  An exterior seal 27 shown in FIG. 7 is another modification of the exterior seal 23 (FIG. 5) described above. Basically, the exterior seal 27 differs from the exterior seal 23 and the cored bar 21 in part in the shape described above, and the same reference numerals are assigned to other identical parts, and detailed description thereof is omitted.

  The exterior seal 27 includes a cored bar 28 attached to the small-diameter portion 5c, and a seal member 24 integrally joined to the cored bar 28 by vulcanization adhesion. The core metal 28 is formed of a cylindrical portion 21a having a substantially L-shaped cross section formed by pressing from an austenitic stainless steel plate or a cold-rolled steel plate that has been rust-proofed, and press-fitted into the small diameter portion 5c. A standing plate portion 21b extending radially outward from the portion 21a and a bent portion 28a protruding from the outer end portion of the standing plate portion 21b to the inner side are provided. And the grease is not applied to the surface of the elastic lip 24a which is the outermost diameter portion of the exterior seal 27, but the grease is previously applied only to the surface of the elastic lip 22b.

  In the present embodiment, since the bent portion 28a protrudes from the outer end portion of the standing plate portion 21b of the cored bar 28, the strength and rigidity of the cored bar 28 itself is increased and the outer diameter side of the seal is gripped. Thus, the assembly facility can be loaded and transported, and the assembly workability is improved without the assembly facility being restricted.

  An exterior seal 29 shown in FIG. 8 is a modification of the above-described exterior seal 27 (FIG. 7). Basically, the exterior seal 29 is only partially different in shape from the exterior seal 27 and the elastic lip 24a described above.

  The exterior seal 29 includes a cored bar 28 attached to the small diameter portion 5c and a seal member 24 'integrally joined to the cored bar 28 by vulcanization adhesion. The seal member 24 ′ is made of synthetic rubber such as NBR, and extends from the elastic lip 22 b extending radially outwardly with the tip inclined to the outer side, and from the standing plate portion 21 b of the cored bar 28 to the bent portion 28 a. The elastic lip 24b is integrally formed. The elastic lip 24b is opposed to the disc portion 18d of the sensor holder 18 through a slight axial clearance to form a labyrinth seal Sr. Further, grease is not applied to the surface of the elastic lip 24b, which is the outermost diameter portion of the exterior seal 29, and grease is applied in advance only to the surface of the elastic lip 22b.

  In the present embodiment, the bent portion 28a is formed so as to protrude from the outer end portion of the standing plate portion 21b of the cored bar 28, and the seal member 24 'wraps around and is joined to the bent portion 28a. As in the above-described embodiment, the strength and rigidity of the cored bar 28 itself are increased, and the outer diameter side of the seal can be grabbed into the assembly facility and transported, and the assembly facility is not limited. The workability is improved, and the sealing performance can be improved without increasing the sealing torque by the addition of the elastic lip 24b.

  An exterior seal 30 shown in FIG. 9 is a modification of the above-described exterior seal 25 (FIG. 6). Basically, the exterior seal 30 is different from the exterior seal 25 and the elastic lip 26a only in part in shape, and the same reference numerals are given to the other same parts, and detailed description thereof is omitted.

  The exterior seal 30 includes a core metal 21 attached to the small diameter portion 5c and a seal member 26 'integrally joined to the core metal 21 by vulcanization adhesion. The seal member 26 ′ is made of synthetic rubber such as NBR, and is joined to an elastic lip 22 b extending radially outwardly with a tip inclined toward the outer side, and an outer end portion of the standing plate portion 21 b of the core metal 21. An elastic lip 26b that elastically contacts the shoulder portion 32a of the outer joint member 32 constituting the quick universal joint 31 is integrally provided. And it opposes the disk part 18d of the sensor holder 18 through a slight axial clearance, and constitutes the labyrinth seal Sr. Further, grease is not applied to the surface of the elastic lip 26b which is the outermost diameter portion of the exterior seal 30, and grease is applied in advance only to the surface of the elastic lip 22b.

  In the present embodiment, the seal member 26 ′ wraps around the outer end portion of the standing plate portion 21 b of the core metal 21, the elastic lip 26 b is joined, elastically contacts the shoulder portion 32 a of the outer joint member 32, and the sensor holder 18. Since the labyrinth seal Sr is formed so as to face the disc portion 18d with a slight axial clearance, the outer diameter side of the seal can be grasped and loaded into the assembly equipment as in the above-described embodiment. This makes it possible to improve the workability of the assembly without restricting the assembly equipment, and to further improve the sealing performance. Although the lip slidably contacting the inner diameter portion 18e of the sensor holder 18 in the embodiment shown in FIGS. 3 to 9 has been described using the elastic lip 22b, the elastic lip 22a may be used.

  FIG. 10 is a longitudinal sectional view showing a second embodiment of the wheel bearing device according to the present invention, FIG. 11 is an enlarged view of a main part showing the detection unit of FIG. 10, and FIG. Sectional drawing which shows an exterior seal single-piece | unit, (b) is sectional drawing which shows the modification of the sensor holder of FIG. The second embodiment is basically the same as the first embodiment described above except that the outer seal form and the sensor holder are partially different in shape, and other parts having the same parts or similar functions. The same reference numerals are given to the parts and the detailed description thereof is omitted.

  This wheel bearing device is for a drive wheel referred to as a third generation, and is a double row rolling element housed in a freely rollable manner between the inner member 1, outer member 2, and both members 1 and 2. 3 and 3. The inner member 1 includes a hub ring 4 and an inner ring 5 press-fitted into the hub ring 4 through a predetermined shimiro.

  In the present embodiment, the sensor holder 33 is fitted on the inner side end of the outer member 2 to close the inner side seal 10. This sensor holder 33 is formed in a cup shape by press working from a non-magnetic austenitic stainless steel plate, and as shown in an enlarged view in FIG. 11, a cylindrical fitting that is press-fitted into the outer periphery of the end portion of the outer member 2. A joint portion 18a, a flange portion 18b extending inward in the radial direction from the fitting portion 18a, and in close contact with the end surface 2c on the inner side of the outer member 2, a cylindrical portion 18c extending in the axial direction from the flange portion 18b, A disc portion 18d extending inward in the radial direction from the cylindrical portion 18c and a cylindrical inner diameter portion 33a extending from the disc portion 18d to the axially outer side are provided.

  An exterior seal 34 is mounted in an annular space formed between the inner diameter portion 33 a of the sensor holder 33 and the outer diameter portion of the inner ring 5. Specifically, the outer diameter of the inner ring 5 is stepped, the slinger 13 constituting the inner seal 10 is fitted on the large diameter portion 5b, and the exterior seal 34 is fitted on the small diameter portion 5c. ing.

  The exterior seal 34 includes a core metal 21 attached to the small-diameter portion 5c and a seal member 35 integrally joined to the core metal 21 by vulcanization adhesion. The seal member 35 is made of a synthetic rubber such as NBR, and integrally has an elastic lip 35a extending outwardly in the radial direction with the tip inclined to the inner side. A chamfered portion 33 b is formed at the end of the inner diameter portion 33 a of the sensor holder 33. The elastic lip 35a is in slidable contact with the inner diameter portion 33a via a predetermined radial shimoshiro. Here, the outermost diameter portion of the outer seal 34, that is, the outer diameter Db of the standing plate portion 21 b of the core metal 21 is larger than the inner diameter Da (the outer diameter of the elastic lip 35 a) of the inner diameter portion 33 a of the sensor holder 33. (Db> Da). And the grease is previously apply | coated to the surface of the elastic lip 35a.

  In the present embodiment, unlike the exterior seal described above, the exterior seal 34 is press-fitted and fixed in advance to the small diameter portion 5 c of the inner ring 5, and then the sensor holder 33 is attached to the outer member 2. At this time, since the chamfered portion 33b is formed in the inner diameter portion 33a of the sensor holder 33, it is possible to prevent the elastic lip 35a of the exterior seal 34 from being drawn. Further, since the outermost diameter portion of the exterior seal 34 becomes the standing plate portion 21b of the cored bar 21 and grease is applied to the elastic lip 22a that is not the outermost diameter portion, the grease is applied to the packing material as in the above-described embodiment. In addition, the outer diameter side of the seal can be grasped in the assembling process, and can be put into an assembling facility and transported, so that the handleability of the exterior seal 34 can be improved.

  12A is a cross-sectional view showing a single exterior seal 34 in FIG. 11, and FIG. 12B is a cross-sectional view showing a modification of the sensor holder 33 in FIG. Here, the sensor holder 36 is formed into a cup shape by press working from a nonmagnetic austenitic stainless steel plate, and is fitted into a cylindrical fitting portion 18a that is press-fitted into the outer periphery of the end portion of the outer member 2. A flange portion 18b extending inward in the radial direction from 18a and closely contacting the inner end face 2c of the outer member 2, a cylindrical portion 18c extending in the axial direction from the flange portion 18b, and a radially inward direction from the cylindrical portion 18c And a disc portion 18d that extends in the axial direction and an inner diameter portion 36a that extends outward from the disc portion 18d in the axial direction.

  The inner diameter portion 36a is formed in a tapered surface that gradually increases in diameter toward the outer side, and the inner diameter Da on the smaller diameter side is set to be smaller than the outer diameter Db of the core metal 21 of the exterior seal 34 (Da <Db). At the same time, since the inner diameter D1 on the large diameter side is set to a larger diameter (D1> D2) than the outer diameter D2 of the elastic lip 35a of the exterior seal 34, the elastic lip 35a is bent when the sensor holder 36 is mounted. Can be prevented.

  Here, fine irregularities are formed by shot blasting on the surface of the inner diameter portion 36a of the sensor holder 36 with which the elastic lip 35a is in sliding contact, and the surface roughness is set to Ra 1.6 or less, preferably Ra 0.32 or less. Has been. Thereby, the lubricity at the sliding contact surface is improved, the lip sliding resistance is reduced, and the rotational torque can be reduced. Note that Ra is one of JIS roughness shape parameters (JIS B0601-1994), and is an arithmetic average roughness, which means an average value of absolute value deviations from an average line. This shot blasting process is performed, for example, by ejecting a 20-200 μm shot having a substantially spherical shape at an ejection speed of 50 m / sec or more. Examples of the shot material include steel balls, ceramics, glass, and the like.

  FIG. 13 is a longitudinal sectional view showing a third embodiment of the wheel bearing device according to the present invention, FIG. 14 is an enlarged view of a main part showing the detection part of FIG. 13, and FIG. 15 is a view of the exterior seal of FIG. 16 is an enlarged view of a part of FIG. 15, FIG. 17 is an enlarged view of a relevant part showing a modification of the exterior seal of FIG. 15, and FIG. 18 is a diagram other than the exterior seal of FIG. FIG. 19 is an enlarged view of a main part showing a modification of the exterior seal of FIG. 18, and FIG. 20 is an enlarged view of a main part showing another modification of the exterior seal of FIG. is there. This third embodiment is basically the same as the first embodiment (FIG. 1) described above except that the exterior seal is press-fitted and fixed to the sensor holder. Parts and parts having the above functions are denoted by the same reference numerals, and detailed description thereof is omitted.

  This wheel bearing device is for a drive wheel referred to as a third generation, and is a double row rolling element housed in a freely rollable manner between the inner member 1, outer member 2, and both members 1 and 2. 3 and 3. The inner member 1 includes a hub ring 4 and an inner ring 5 press-fitted into the hub ring 4 through a predetermined shimiro.

  In this embodiment, the sensor holder 18 is fitted to the inner end of the outer member 2 to close the inner seal 10. An exterior seal 37 is press-fitted into the inner diameter portion 18e of the sensor holder 18, and an annular space formed between the sensor holder 18 and the inner ring 5 is sealed.

  As shown in an enlarged view in FIG. 14, the exterior seal 37 includes a cored bar 38 attached to the inner diameter portion 18e of the sensor holder 18 and a seal member 39 integrally joined to the cored bar 38 by vulcanization adhesion. Become. The metal core 38 is formed of an austenitic stainless steel plate or a cold-rolled steel plate that has been rust-proofed by a pressing process so that the cross section is substantially L-shaped, and a cylindrical portion 38 a that is press-fitted into the inner diameter portion 18 e of the sensor holder 18. And a standing plate portion 38b extending radially inward from the cylindrical portion 38a.

  The seal member 39 is made of synthetic rubber such as NBR, and integrally has an elastic lip 39a extending radially inwardly with the tip inclined to the inner side. The elastic lip 39a is in sliding contact with the small-diameter portion 5c of the inner ring 5 via a predetermined radial shimiro. Here, the innermost diameter portion of the outer seal 37, that is, the inner diameter Dc of the standing plate portion 38b of the core metal 38 is smaller than the outer diameter Dd (the inner diameter of the elastic lip 39a) of the small diameter portion 5c of the inner ring 5 (Dc <Dd). ). And the grease is previously apply | coated to the surface of the elastic lip 39a.

  In the present embodiment, unlike the above-described exterior seal, the exterior seal 37 may be press-fitted and fixed to the inner diameter portion 18e of the sensor holder 18 in advance, and then the sensor holder 18 may be attached to the outer member 2, or the sensor After mounting the holder 18 on the outer member 2, the exterior seal 37 may be press-fitted into the inner diameter portion 18 e of the sensor holder 18. By making the exterior seal 37 into such a shape, the degree of assembly freedom is increased, and the assembly workability can be improved.

  Further, since the innermost diameter portion of the outer seal 37 becomes the standing plate portion 38b of the cored bar 38 and grease is applied to the elastic lip 39a which is not the innermost diameter portion, the grease adheres to the packaging material as in the above-described embodiment. In addition, the inner diameter side of the seal can be grasped in the assembling process, and can be loaded into the assembling equipment and transported, so that the handleability of the exterior seal 37 can be improved.

  FIG. 15 is a modification of the exterior seal 37 of FIG. The exterior seal 40 basically differs from the above-described exterior seal 37 only in the shape of the elastic lip 39a, and the same reference numerals are assigned to other identical parts, and detailed description thereof is omitted.

  The exterior seal 40 includes a cored bar 38 attached to the inner diameter portion 18e of the sensor holder 18 and a seal member 41 integrally joined to the cored bar 38 by vulcanization adhesion. The seal member 41 is made of a synthetic rubber such as NBR, and integrally has an elastic lip 41a extending radially inwardly with the tip inclined to the outer side. The elastic lip 41a is in sliding contact with the small-diameter portion 5c of the inner ring 5 via a predetermined radial direction shimiro. Here, grease is previously applied to the surface of the elastic lip 41a.

  In the present embodiment, the elastic lip 41a of the exterior seal 40 is formed to be inclined toward the outer side, and as shown in an enlarged view in FIG. 16, is shorter in the radial direction than the elastic lip 39a described above, and also in the axial direction. And the width A of the contact portion is set to be long. As a result, when the outer seal 40 is press-fitted into the small diameter portion 5c of the inner ring 5, the elastic lip 41a is prevented from coming into contact with the small diameter portion 5c of the inner ring 5, and the width A of the contact portion is increased. Sealability can be improved.

  FIG. 17 is a modification of the exterior seal 40 of FIG. The exterior seal 42 is basically different from the above-described exterior seal 40 only in that an elastic lip 43a is added, and other identical parts are denoted by the same reference numerals and detailed description thereof is omitted.

  The exterior seal 42 includes a cored bar 38 attached to the inner diameter portion 18e of the sensor holder 18 and a seal member 43 integrally joined to the cored bar 38 by vulcanization adhesion. The seal member 43 is made of a synthetic rubber such as NBR, and is disposed at the radially inner side of the elastic lip 41a extending with the tip inclined toward the outer side and the inner end of the upright plate portion 38b of the cored bar 38. An elastic lip 43a is integrally formed inwardly with the tip extending inclined toward the outer side. The elastic lip 43a is in sliding contact with the large end surface 5d of the inner ring 5 via a predetermined axial shimiro. Here, grease is previously applied to the surfaces of the elastic lips 41a and 43a. In this embodiment, since the elastic lip 43a is further added to the elastic lip 41a of the exterior seal 42, the sealing performance can be improved.

  FIG. 18 is another modification of the exterior seal 40 of FIG. The exterior seal 44 is basically different from the above-described exterior seal 40 only in that a labyrinth seal Sr is added, and other identical parts are denoted by the same reference numerals and detailed description thereof is omitted.

  The exterior seal 44 includes a cored bar 38 attached to the inner diameter portion 18e of the sensor holder 18 and a seal member 45 integrally joined to the cored bar 38 by vulcanization adhesion. The seal member 45 is made of a synthetic rubber such as NBR, and is joined to the elastic lip 41a extending radially inward with the tip inclined to the outer side and to the inner end portion of the standing plate portion 38b of the core metal 38. The elastic lip 45a is integrally provided. The elastic lip 45a is opposed to the large end surface 5d of the inner ring 5 via a slight axial clearance to form a labyrinth seal. In this embodiment, since the labyrinth seal Sr is further added to the elastic lip 41a of the exterior seal 44, the sealing performance can be improved without increasing the rotational torque.

  FIG. 19 is a modification of the exterior seal 44 of FIG. The exterior seal 46 basically differs from the exterior seal 44 described above only in the shape of the cored bar 38, and the same reference numerals are given to other identical parts, and detailed description thereof is omitted.

  The exterior seal 46 includes a cored bar 47 attached to the inner diameter portion 18e of the sensor holder 18 and a seal member 45 integrally joined to the cored bar 47 by vulcanization adhesion. The metal core 47 is formed of an austenitic stainless steel plate or a cold-rolled steel plate that has been rust-proofed into a substantially L-shaped section by press working, and a cylindrical portion 38 a that is press-fitted into the inner diameter portion 18 e of the sensor holder 18. A standing plate portion 38b extending radially inward from the cylindrical portion 38a, a tapered portion 47a partially overlapping with the standing plate portion 38b and extending obliquely outward in the radial direction, and an axial direction from the tapered portion 47a And a cylindrical umbrella portion 47b extending in the direction.

  From the standing plate portion 38b of the metal core 47 to the taper portion 47a and the umbrella portion 47b, the outer joint member 48 of the constant velocity universal joint (not shown) that is abutted with the large end surface 5d of the inner ring 5 has a shape along the outer shape. Thus, a complex labyrinth seal Sr is formed. Thus, in this embodiment, since the labyrinth seal Sr is further added to the core metal 47 of the exterior seal 46, the sealing performance can be improved without increasing the rotational torque.

  FIG. 20 is another modification of the exterior seal 44 of FIG. The exterior seal 49 basically differs from the exterior seal 44 described above only in part in the shape of the sensor holder 18, and the same reference numerals are given to other identical parts, and detailed description thereof is omitted.

  This sensor holder 18 ′ is formed in a cup shape by press working from a nonmagnetic austenitic stainless steel plate, and is fitted with a cylindrical fitting portion 18a that is press-fitted into the outer periphery of the end portion of the outer member 2. A flange portion 18b extending inward in the radial direction from 18a and closely contacting the inner end face 2c of the outer member 2, a cylindrical portion 18c extending in the axial direction from the flange portion 18b, and a radially inward direction from the cylindrical portion 18c A disc portion 18d extending inward, a cylindrical inner diameter portion 18e extending axially outward from the disc portion 18d, and an annular locking portion 18f projecting radially inward from the inner diameter portion 18e. ing. The exterior seal 49 is attached to the inner diameter portion 18e of the sensor holder 18 until it contacts the locking portion 18f.

  In the present embodiment, the locking portion 18f is formed in the sensor holder 18 ', and the exterior seal 49 is attached to the inner diameter portion 18e until it comes into contact with the locking portion 18f. Therefore, the positioning accuracy of the exterior seal 49 is improved. The clearance of the labyrinth seal Sr can be set with high accuracy, and the assemblability can be improved and the reliability of the quality can be improved.

  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 according to the present invention can be applied to a wheel bearing device on the driving wheel side of the 2.5th generation and first to third generation structures of the inner ring rotation type.

DESCRIPTION OF SYMBOLS 1 Inner member 2 Outer member 2a Outer rolling surface 2b Car body mounting flange 2c End side of inner side of outer member 3 Rolling element 4 Hub wheel 4a, 5a Inner rolling surface 4b Small diameter step 4c Serration 5 Inner ring 5b Large diameter portion 5c Small diameter portion 5d of inner ring Large end surface 6 of inner ring Wheel mounting flange 6a Base portion on inner side of wheel mounting flange 7 Hub bolt 8 Cage 9 Outer side seal 10 Inner side seals 11, 16, 21, 28, 38 , 47 Core metal 12, 17, 22, 22 ', 24, 24', 26, 26 ', 35, 39, 41, 43, 45 Seal members 12a, 17a Side lips 12b, 17c Dustrips 12c, 17b Grease lip 13 Slinger 13a, 18c, 21a, 38a Cylindrical portion 13b, 21b, 38b Standing plate portion 14 Seal plate 15 Magnetic encoder 18, 18 ', 3 3, 36 Sensor holder 18a Fitting portion 18b Fence portion 18d Disc portions 18e, 33a, 36a Inner diameter portion 18f Locking portion 19 Rotational speed sensor 19a Detection portions 20, 20 ′, 23, 25, 27, 29, 30, 34 , 37, 40, 42, 44, 46, 49 Exterior seals 22a, 22b, 24a, 24b, 26a, 26b, 35a, 39a, 41a, 43a, 45a Elastic lip 28a Bent part 31 Constant velocity universal joints 32, 48 Outside Joint member 32a Shoulder portion 33b Chamfered portion 47a Tapered portion 47b Umbrella portion 50 Outer member 50a Outer rolling surface 50b Car body mounting flange 51 Inner member 52 Ball 53 Hub wheel 53a, 54a Inner rolling surface 53b Small diameter step portion 54 Inner ring 55 Wheel mounting flange 56 Seal 57 First seal seal 58 Slinger 59 Annular seal plate 60 Magnetic encoder 61 Sensor Case 61a First cylindrical portion 61b Bottom portion 61c Second cylindrical portion 62 Sensor 63 Body 64 Detection portion 65 Extraction portion 66 Lead wire 67 Small diameter portion 68 Second sealing seal 69 Core metal 69a Cylindrical portion 69b collar 70 Elastic members 70a, 70b Seal Lip A Contact portion of elastic lip Da Inner diameter Db of sensor holder inner diameter Db Outer diameter D of core plate upright part Dc Inner diameter Dd of core metal standup plate part Outer diameter D1 of inner ring small diameter part Large inner diameter part of sensor holder Diameter side inner diameter D2 Outer seal elastic lip outer diameter Sr Labyrinth seals I, II Sealing space

Claims (17)

An outer member integrally having a vehicle body mounting flange for being attached to a knuckle constituting a suspension device on the outer periphery, and an outer rolling surface of a double row integrally formed on the inner periphery;
From a hub wheel integrally having a wheel mounting flange for mounting a wheel at one end and having a small-diameter step portion extending in the axial direction on the outer periphery, and at least one inner ring press-fitted into the small-diameter step portion of the hub ring An inner member in which a double row inner rolling surface facing the outer rolling surface of the double row is formed on the outer periphery,
A double row rolling element housed movably between the rolling surfaces of the inner member and the outer member;
A magnetic encoder fitted on the inner ring,
A seal is attached to the opening of the annular space formed between the outer member and the inner member,
In the wheel bearing device in which a sensor holder is fitted to the inner side end of the outer member, a rotational speed sensor is mounted on the sensor holder, and is arranged to face the magnetic encoder via a predetermined air gap.
The sensor holder is formed into a cup shape by pressing from a steel plate, and is fitted into a cylindrical fitting portion that is press-fitted into the outer periphery of the end portion of the outer member, and extends radially inward from the fitting portion. A flange portion that is in close contact with the end surface on the inner side of the side member, a cylindrical portion that extends in the axial direction from the flange portion, a disk portion that extends radially inward from the cylindrical portion, and an axially outer side from the disk portion A cylindrical inner diameter portion extending to
An exterior seal is attached to the annular space formed between the inner diameter part and the outer diameter part of the inner ring, and the detection part of the rotational speed sensor is sealed,
The outer seal is integrally formed by a vulcanized bond to a cored bar having a cylindrical part press-fitted into the outer diameter part of the inner ring, and a vertical plate part extending radially outward from the cylindrical part. The sealing member, which is joined, has an elastic lip integrally extending in a radially outward direction and in sliding contact with an inner diameter portion of the sensor holder via a predetermined radial shimiro, The outer diameter of the outermost diameter portion of the seal is formed larger than the outer diameter of the elastic lip,
A wheel bearing device in which grease is previously applied to the surface of the elastic lip.   The outermost diameter portion of the outer seal is the outer diameter of the standing plate portion of the cored bar, the standing plate portion is disposed on the inner side of the sensor holder, and the elastic lip has a tip radially outward. The wheel bearing device according to claim 1, wherein the wheel bearing device extends inclined toward the inner side.   The outermost diameter portion of the outer seal is the outer diameter of the standing plate portion of the cored bar, the standing plate portion is disposed on the inner side of the sensor holder, and the elastic lip has a tip radially outward. The wheel bearing device according to claim 1, wherein the wheel bearing device extends obliquely toward the outer side, is short in the radial direction, and is long in the axial direction.   An elastic lip integrally extending from the outer end of the upright portion of the cored bar to incline in the radial direction is integrally formed, and this elastic lip slides on the disc portion of the sensor holder via a predetermined axial squeeze. The wheel bearing device according to claim 1, which is in contact with the wheel bearing device.   An elastic lip is integrally formed on the outer end portion of the upright plate portion of the cored bar, and the elastic lip faces the disc portion of the sensor holder through a slight axial clearance to form a labyrinth seal. The wheel bearing device according to any one of claims 1 to 3.   An elastic lip is integrally joined to the outer end portion of the upright plate portion of the cored bar, and is elastically contacted with the shoulder portion of the outer joint member constituting the constant velocity universal joint, and is slightly attached to the disc portion of the sensor holder. The wheel bearing device according to any one of claims 1 to 3, wherein a labyrinth seal is formed facing each other through an axial clearance.   The outermost diameter portion of the outer seal is the outer diameter of the standing plate portion of the cored bar, and this standing plate portion is disposed on the outer side of the sensor holder, and the elastic lip has a tip radially outward. The wheel bearing device according to claim 1, wherein the wheel bearing device extends at an inner side and has a chamfered portion formed at an end of an inner diameter portion of the sensor holder.   The inner diameter portion of the sensor holder is formed in a tapered surface that gradually increases in diameter toward the outer side, and the inner diameter on the smaller diameter side of the inner diameter portion is set to be smaller than the outer diameter of the core metal stand plate portion of the exterior seal. The wheel bearing device according to claim 1, wherein an inner diameter of the inner diameter portion on a larger diameter side is set to be larger than an outer diameter of an elastic lip of the exterior seal.   2. The surface roughness of the inner diameter portion and the disc portion of the sensor holder, which is in sliding contact with the elastic lip of the exterior seal, is formed by shot blasting, and the surface roughness is set to Ra 1.6 or less. The bearing apparatus for wheels in any one of thru | or 8. An outer member integrally having a vehicle body mounting flange for being attached to a knuckle constituting a suspension device on the outer periphery, and an outer rolling surface of a double row integrally formed on the inner periphery;
From a hub wheel integrally having a wheel mounting flange for mounting a wheel at one end and having a small-diameter step portion extending in the axial direction on the outer periphery, and at least one inner ring press-fitted into the small-diameter step portion of the hub ring An inner member in which a double row inner rolling surface facing the outer rolling surface of the double row is formed on the outer periphery,
A double row rolling element housed movably between the rolling surfaces of the inner member and the outer member;
A magnetic encoder fitted on the inner ring,
A seal is attached to the opening of the annular space formed between the outer member and the inner member,
In the wheel bearing device in which a sensor holder is fitted to the inner side end of the outer member, a rotational speed sensor is mounted on the sensor holder, and is arranged to face the magnetic encoder via a predetermined air gap.
The sensor holder is formed into a cup shape by pressing from a steel plate, and is fitted into a cylindrical fitting portion that is press-fitted into the outer periphery of the end portion of the outer member, and extends radially inward from the fitting portion. A flange portion that is in close contact with the end surface on the inner side of the side member, a cylindrical portion that extends in the axial direction from the flange portion, a disk portion that extends radially inward from the cylindrical portion, and an axially outer side from the disk portion A cylindrical inner diameter portion extending to
An exterior seal is attached to the annular space formed between the inner diameter part and the outer diameter part of the inner ring, and the detection part of the rotational speed sensor is sealed,
The outer seal is integrally formed by a vulcanization adhesion to a mandrel having a cylindrical part press-fitted into the inner diameter part of the sensor holder, and a standing plate part extending radially inward from the cylindrical part. The sealing member, which is joined, has an elastic lip integrally extending in a radially inwardly inclined manner and slidably contacting the outer diameter portion of the inner ring via a predetermined radial shimiro, The inner diameter of the innermost diameter portion of the seal is formed smaller than the inner diameter of the elastic lip,
A wheel bearing device in which grease is previously applied to the surface of the elastic lip.   An outer diameter portion of the inner ring is formed with a step, a slinger constituting the inner side seal is press-fitted into the large diameter portion, and the magnetic encoder is integrally joined to the slinger, and the small diameter portion and the sensor The wheel bearing device according to claim 1 or 10, wherein the exterior seal is attached to an inner diameter portion of the holder.   The innermost diameter portion of the outer seal is the inner diameter of the upright plate portion of the core metal, and the upright plate portion is disposed on the inner side of the sensor holder, and the elastic lip is radially inward and the tip is on the inner side. The wheel bearing device according to claim 10, wherein the wheel bearing device extends at an angle.   The outermost inner diameter portion of the outer seal is the inner diameter of the standing plate portion of the core metal, and the standing plate portion is disposed on the inner side of the sensor holder, and the elastic lip is radially outward and the tip is on the outer side. The wheel bearing device according to claim 10, wherein the wheel bearing device extends in a slanted direction, is short in the radial direction, and is long in the axial direction.   An elastic lip integrally extending from the inner end of the upright portion of the cored bar to incline in the radial direction is integrally formed, and this elastic lip is in elastic contact with the large end surface of the inner ring via a predetermined axial nip. The wheel bearing device according to any one of claims 10, 12 and 13.   An elastic lip is integrally formed at an inner end portion of the standing plate portion of the metal core, and the elastic lip is opposed to a large end surface of the inner ring through a slight axial clearance to form a labyrinth seal. A wheel bearing device according to any one of claims 10 and 12.   The wheel bearing device according to claim 1, wherein the sensor holder is formed from a nonmagnetic austenitic stainless steel plate by press working.   The wheel bearing device according to any one of claims 10 to 16, further comprising an annular locking portion protruding radially inward from an inner diameter portion of the sensor holder.

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