JP2015001295A - Bearing device for wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device for a wheel which has moment stiffness.SOLUTION: A bearing device 20 for a wheel has an external member 30 formed with a pair of external track surfaces 31a and 35a on an inner periphery; an internal member 21 disposed on an inner peripheral side of the external member 30, and formed with a pair of internal track surfaces 22a and 27a on an outer periphery; and a plurality of first rolling bodies 40 and a plurality of second rolling bodies 45 rolling between the pair of the external track surfaces 31a and 35a and the pair of the internal track surfaces 22a and 27a. A wheel is attached to either one of the external member 30 or the internal member 21, and the other is attached to a vehicle body. On the external member 20, an external thrust surface extending in a radial direction between the pair of the external track surfaces 31a and 35a is formed, and on the internal member 21, an internal thrust surface extending in a radial direction between the pair of the internal track surfaces 22a and 27a is formed. A plurality of third rolling bodies 87 rolling between the external thrust surfaces and the internal thrust surfaces is disposed between those.

Description

  The present invention relates to a wheel bearing device.

  A conventional general wheel bearing device has an outer member formed with a pair of outer raceway surfaces on the inner periphery, and is disposed on the inner periphery side of the outer member, and forms a pair of inner raceway surfaces on the outer periphery. And a plurality of first rolling elements and a plurality of second rolling elements that roll between the pair of outer raceway surfaces and the pair of inner raceway surfaces.

  In order to increase the moment rigidity, the wheel bearing device shown in Patent Document 1 includes a plurality of wheels arranged on the wheel mounting side with respect to the pair of outer raceway surfaces in addition to the configuration of the general wheel bearing device described above. It has a 3rd rolling element. A third outer raceway surface on which the third rolling element rolls is formed on the outer member, and a third inner raceway surface on which the third rolling element rolls is formed on the inner member. The third outer raceway surface and the third inner raceway surface are formed on the outer diameter side of the pair of outer raceway surfaces, and the third rolling element is more than the first rolling element and the second rolling element. Small diameter balls are used.

Japanese Patent No. 3887350

  In order to arrange the third rolling element in a limited space between the vehicle body and the wheel, it is necessary to reduce the distance between the first rolling element and the second rolling element. Although the moment stiffness is increased by providing the third rolling element, the moment stiffness is reduced by reducing the distance between the first rolling element and the second rolling element, and as a whole, the moment stiffness is not increased so much. there were. In emerging countries, there are many unpaved roads, and the left and right unbalance of the ruins that are the traces of the wheels is large, and the car body tilts greatly. .

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a wheel bearing device having high moment rigidity.

  A wheel bearing device for solving the above-mentioned problems is an outer member having a pair of outer raceway surfaces formed on the inner periphery, and is disposed on the inner periphery side of the outer member, and a pair of inner members on the outer periphery. An inner member having a raceway surface, and a plurality of first rolling elements and a plurality of second rolling elements that roll between the pair of outer raceway surfaces and the pair of inner raceway surfaces, In a wheel bearing device in which a wheel is attached to one of the outer member and the inner member and the other is attached to a vehicle body, the outer member extends outwardly between the pair of outer raceway surfaces on the outer member. Forming a thrust surface, and forming an inward thrust surface extending in a radial direction between the pair of inward raceway surfaces on the inward member, between the outer thrust surface and the inward thrust surface. A plurality of third rolling elements that roll between are arranged.

  According to the above configuration, since the third rolling element is disposed between the first rolling element and the second rolling element, the distance between the first rolling element and the second rolling element is increased, and the moment rigidity is further increased. By providing the rolling elements, the moment stiffness is further increased, and a wheel bearing device having a high moment stiffness can be provided.

  In the wheel bearing device for solving the above-described problem, the inner member includes a first inner member that forms one of the pair of inner raceway surfaces, and the pair of inner raceway surfaces. Of these, the second inner member is formed with the other, and the second inner member is axially inserted and fixed to the outer periphery of the first inner member.

  According to the said structure, the assembly | attachment operation | work of a 1st rolling element and a 2nd rolling element becomes easy by comprising the inner member by the 1st inner member and the 2nd inner member. By disposing the third rolling element between the first rolling element and the second rolling element, it is possible to provide a wheel bearing device with high moment rigidity.

  In the wheel bearing device for solving the above-described problem, the inner member includes a third inner member that is clamped in the axial direction by the first inner member and the second inner member. 3. The inner thrust surface is formed on the inner member.

  According to the above configuration, the third inner rolling member is formed between the first inner member and the second inner member, so that the third rolling element can be easily assembled. . By disposing the third rolling element between the first rolling element and the second rolling element, it is possible to provide a wheel bearing device with high moment rigidity.

  In the wheel bearing device for solving the above-described problem, the outer member includes a first outer member that forms one of the pair of outer raceway surfaces, and the pair of outer raceway surfaces. Of these, the second outer member is formed with the other, and the first outer member is inserted into the second outer member in the axial direction and fixed.

  According to the said structure, the assembly | attachment operation | work of a 1st rolling element becomes easy by comprising the outer member by the 1st outer member and the 2nd outer member. By disposing the third rolling element between the first rolling element and the second rolling element, it is possible to provide a wheel bearing device with high moment rigidity.

  The wheel bearing device for solving the above-described problems is characterized in that the outer thrust surface is formed on the second outer member.

  According to the said structure, the assembly | attachment operation | work of a 1st rolling element becomes easy by forming the thrust surface for outward in the 2nd outer member. By disposing the third rolling element between the first rolling element and the second rolling element, it is possible to provide a wheel bearing device with high moment rigidity.

  According to the present invention, by disposing the third rolling element between the first rolling element and the second rolling element, the distance between the first rolling element and the second rolling element is increased, and the moment rigidity is further increased. By providing the rolling elements, the moment stiffness is further increased, and a wheel bearing device having a high moment stiffness can be provided.

It is an attachment state figure to the knuckle arm of the bearing device for wheels concerning one embodiment of the present invention. It is a partially expanded sectional view of FIG. 1 concerning one Embodiment of this invention.

  A first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a view showing a state in which a wheel bearing device is attached to a knuckle arm, and FIG. 2 is a partially enlarged sectional view of FIG.

  As shown in FIG. 1, the wheel bearing device 20 is attached to a knuckle arm 75 via a mounting bolt 60. A brake rotor 10 is fixed to the wheel bearing device 20, and a drive snake wheel is attached to the wheel bearing device 20 via a coupling mechanism 50. Further, the wheel bearing device 20 has a constant velocity joint. 70 is attached.

  The knuckle arm 75 turns around a vertical axis with respect to a vehicle body (not shown), and supports the vehicle body via a suspension (not shown). The knuckle arm 75 is turned by an electric power steering device (not shown).

  The drive snake wheel includes an iron wheel 80 and a rubber tire 81. A tire 81 is attached to the outer periphery of the wheel 80. A plurality of mounting holes 80a are formed in the wheel 80 in the circumferential direction, and penetrate through the wheel 80 in the axial direction. The drive snake wheel is attached to the wheel bearing device 20 by inserting the connection bolt 51 of the connection mechanism 50 into the attachment hole 80a and screwing the connection nut 55 into the connection bolt 51.

  The connection mechanism 50 includes a connection bolt 51 and a connection nut 55 that is screwed into the threaded portion 54 of the connection bolt 51. The connecting bolt 51 has a head portion 52 extending in the outer diameter direction, a selection portion 53 in which a selection is formed, and a screw portion 54 in which a male screw is formed. The screw portion 54 is formed on one side of the connecting bolt 51 in the axial direction, the head portion 52 is formed on the other side of the connecting bolt 51 in the axial direction, and the selection portion 53 is the head portion of the connecting bolt 51 in the axial direction. 52 is formed on the side. The selection portion 53 is press-fitted into the attached hole 23 a of the inner member 21, and the connecting bolt 51 is fixed to the inner member 21.

  As shown in FIGS. 1 and 2, the wheel bearing device 20 includes an outer member 30 attached to the knuckle arm 75, an inner member 21 disposed on the inner peripheral side of the outer member 30, and the outer member 30. A first ball 40 and a second ball 45 rolling between the inner members 21 and a plurality of first balls 40 and a plurality of second balls 45 which are rotatably held at intervals in the circumferential direction. And have. There are a first angular cage 42 arranged in a row consisting of a plurality of first balls 40 and a second angular cage 46 arranged in a row consisting of a plurality of second balls 45. Thus, the wheel bearing device 20 is a first angular contact ball bearing comprising a first outer raceway surface 31a described later, a first inner raceway surface 22a described later, a first ball 40, and a first angular retainer 42. And a second angular contact ball bearing including a second outer raceway surface 35a described later, a second inner raceway surface 27a described later, a second ball 45, and a second angular retainer 46.

  The wheel bearing device 20 includes a thrust outer member 86 that rotates integrally with the outer member 30, a thrust inner member 88 that rotates integrally with the inner member 21, a thrust outer member 86, and a thrust inner member. A roller 87 that rolls between the members 88 and a thrust retainer 89 that rotatably holds the plurality of rollers 87 at intervals in the circumferential direction. Thus, the wheel bearing device 20 includes the thrust roller bearing 85 including the outer thrust surface described later, the inner thrust surface described later, the roller 87, and the thrust retainer 89.

  The outer member 30 includes a first outer member 31 on the coupling mechanism 50 side and a second outer member 35 on the knuckle arm 75 side. The first outer member 31 includes a cylindrical first outer cylindrical portion 32 and a first outer flange 33 extending in the outer diameter direction from the outer periphery of the other end of the first outer cylindrical portion 32. In order to reduce the weight, a plurality of first outer flanges 33 are formed in the circumferential direction, and there is no thickness between the pair of first outer flanges 33. The second outer member 35 includes a cylindrical second outer cylindrical portion 36, a second outer flange 37 extending in the outer radial direction from the outer periphery of one end of the second outer cylindrical portion 36, and a second outer member. A cylindrical fitting portion 38 extending in the axial direction from the outer diameter side of the direction flange 37 to the coupling mechanism 50 side. In order to reduce the weight, a plurality of second outer flanges 37 are formed in the circumferential direction, and there is no thickness between the pair of second outer flanges 37.

  By inserting the first outer member 31 in the axial direction with respect to the second outer member 35, the outer periphery of the first outer flange 33 is press-fitted into the inner periphery of the fitting portion 38, and the first outer member One end surface of the second outer flange 37 is in contact with the other end surface of the direction flange 33. Thus, the first outer member 31 and the second outer member 35 are integrated. The outer periphery of the second outer cylindrical portion 36 is fitted to the inner periphery of the knuckle arm 75, and the other side surface of the second outer flange 37 is in contact with the one side surface of the knuckle arm 75. The first outer flange 33 and the second outer flange 37 are attached to the knuckle arm 75 via the attachment bolt 60.

  As shown in FIGS. 1 to 3, the inner member 21 includes a first inner member 22 on the coupling mechanism 50 side and a second inner member 27 on the knuckle arm 75 side. The first inner member 22 includes a cylindrical inner cylindrical portion 25, an inner flange 23 extending in the outer diameter direction from the outer periphery of one end of the inner cylindrical portion 25, and one end of the inner cylindrical portion 25. And a cylindrical fitting portion 24 extending in the axial direction. In order to reduce the weight, a plurality of inner flanges 23 are formed in the circumferential direction, and there is no thickness between the pair of inner flanges 23.

  By inserting the second inner member 27 in the axial direction with respect to the first inner member 22, the second inner member 27 is press-fitted to the outer periphery of the other end of the inner cylindrical portion 25. By inserting a notch 22b in the other end surface of the inner cylindrical portion 25, a part of the outer periphery of the other end of the inner cylindrical portion 25 is caulked to the outer diameter side, and a second inner member for the inner cylindrical portion 25 is obtained. 27 is prevented from coming off. Thus, the first inner member 22 and the second inner member 27 are integrated.

  A first outer raceway surface 31 a is formed on the inner periphery of the first outer cylindrical portion 32, and a second outer raceway surface 35 a is formed on the inner periphery of the second outer cylindrical portion 36. Yes. A first inner raceway surface 22 a is formed on the outer periphery of the inner cylindrical portion 25, and a second inner raceway surface 27 a is formed on the outer periphery of the second inner member 27. The first ball 40 rolls on the first outer raceway surface 31a and the first inner raceway surface 22a, and the second ball on the second outer raceway surface 35a and the second inner raceway surface 27a. 45 rolls.

  The second outer member 35 has an inner diameter from the inner periphery of one end of the second outer cylindrical portion 36 in addition to the second outer cylindrical portion 36, the second outer flange 37, and the fitting portion 38 described above. A thrust outer member 86 extending in the direction is provided. A thrust inner member 88 is sandwiched between the step portion of the inner cylindrical portion 25 and the second inner member 27 in the axial direction. An outer thrust surface is formed on the other end surface of the thrust outer member 86, and an inner thrust surface is formed on one end surface of the thrust inner member 88. The rollers 87 roll on the outer thrust surface and the inner thrust surface.

  First outer member 31, second outer member 35, first inner member 22, second inner member 27, first ball 40, second ball 45, thrust inner member 88, roller 87, thrust The cage 89 is made of iron, and the first angular cage 42 and the second angular cage 46 are made of resin. The first outer member 31, the second outer member 35, the first inner member 22, the second inner member 27, and the thrust inner member 88 are formed into rough shapes by forging, and predetermined by cutting and grinding. It is processed to become a size.

  There is a first line connecting the contact point between the first outer raceway surface 31a and the first ball 40 and the contact point between the first inner raceway surface 22a and the first ball 40. There is a second line connecting the contact point between the second outer raceway surface 35a and the second ball 45 and the contact point between the second inner raceway surface 27a and the second ball 45. There is a third radial line of the angular ball bearing that passes through the intersection of the first and second lines. The intersection of the third line and the axis of the angular ball bearing is the support center of the first angular ball bearing and the second angular ball bearing. When a load is applied from the outside, a moment around the support center is generated. The moment rigidity is higher when the distance between the center of the first ball 40 and the center of the second ball 45 is larger as viewed from the support center. The moment rigidity is higher when the distance from the support center to the first ball 40 and the second ball 45 is larger. Further, the moment rigidity is higher when the distance from the support center to the roller 87 is larger.

  The inner periphery of the brake rotor 10 is press-fitted to the outer periphery of the fitting portion 24, and the inner periphery of the wheel 80 is loosely fitted to the outer periphery of the fitting portion 24. The inner flange 23 is formed with an attached hole 23a penetrating in the axial direction at a position corresponding to the attachment hole 80a of the wheel 80. The selection part 53 of the connecting bolt 51 is press-fitted into the mounting hole 23a.

  The brake rotor 10 includes a disc-shaped mounting portion 11, a cylindrical cylindrical portion 12, a disc-shaped flange portion 13, fins 15 arranged at equal intervals in the circumferential direction, and a disc-shaped disc portion 14. It is made up of. A mounting portion 11 is integrally formed on the inner periphery of one end of the cylindrical portion 12, and a flange portion 13 is integrally formed on the outer periphery of the other end of the cylindrical portion 12. Fins 15 are disposed between the flange portion 13 and the disk portion 14 and are integrally formed with each other. A first through hole 11 a is formed in the mounting portion 11 at a position corresponding to the mounting hole 80 a of the wheel 80 in the axial direction. The connecting bolt 51 is inserted through the first through hole 11a. The inner periphery of the attachment portion 11 is press-fitted into the outer periphery of the fitting portion 24 of the inner member 21, and the brake rotor 10 is fixed to the inner member 21.

  As shown in FIG. 1, vent holes are formed between the pair of fins 15 in the circumferential direction and between the flange portion 13 and the disk portion 14 in the axial direction. When the air flows from the inner periphery to the outer periphery via the vent, the space between the flange portion 13 and the disk portion 14 is cooled.

  The brake rotor 10 is made of iron, is formed into a rough shape by casting, and is processed to have a predetermined size by cutting and grinding. The side surfaces on both sides of the flange portion 13 and the disk portion 14 and the side surface on the inner flange 23 side of the mounting portion 11 are processed by cutting and grinding so as to be parallel to each other.

  As shown in FIG. 1, a pair of brake pads (not shown) are arranged on both sides in the axial direction across the flange portion 13 and the disk portion 14, and the brake pads are attached to the flange portion 13 and the disk portion 14 by a cylinder device (not shown). It is designed to move forward and backward. A caliper including a brake pad and a cylinder device is attached to the knuckle arm 75.

  The constant velocity joint 70 includes a bowl-shaped bowl-shaped part 71, a shaft part 72 integrally formed at one end of the bowl-shaped part 71, a locking nut 73 screwed into the shaft part 72, And a boot 74 fitted into the end. The shaft portion 72 is spline-fitted to the inner periphery of the inner cylindrical portion 25 of the inner member 21, and the rotation of the shaft portion 72 is transmitted to the inner member 21 via the spline. A lock nut 73 is screwed onto the shaft portion 72, and the inner member 21 is sandwiched between the hook-shaped portion 71 and the lock nut 73 in the axial direction. The constant velocity joint 70 serves to transmit the rotational power of the engine (not shown) to the inward member 21 even when the knuckle arm 75 moves up and down with respect to the vehicle body or turns.

  Next, the assembly operation of the wheel bearing device 20 will be described based on the configuration described above.

  The first outer member 31 is fitted into the first inner member 22, and the first outer member 31 is eccentric with respect to the first inner member 22. Due to this eccentricity, the gap between the first inner raceway surface 22a and the first outer raceway surface 31a is increased at one place on the circumference, and a plurality of first balls 40 are sequentially inserted therein. At this time, since the second outer member 35, the thrust inner member 88, and the second inner member 27 are not provided, the first ball 40 can be easily inserted. The plurality of first balls 40 are arranged at equal intervals in the circumferential direction, and the first angular retainer 42 is inserted between the first inner member 22 and the first outer member 31 in the axial direction. Thereby, while the some 1st ball | bowl 40 is hold | maintained at the 1st angular retainer 42, the 1st inner member 22 and the 1st outer member 31 are mutually arrange | positioned coaxially.

  The second outer member 35 is inserted into the first outer member 31 in the axial direction, and the inner periphery of the fitting portion 38 is press-fitted into the outer periphery of the first outer flange 33. Thus, the first outer member 31 and the second outer member 35 are integrated. A plurality of rollers 87 are arranged at equal intervals in the circumferential direction on the outer thrust surface, and a thrust retainer 89 is inserted between the first inner member 22 and the second outer member 35 in the axial direction. As a result, the plurality of rollers 87 are held by the thrust retainer 89. At this time, since there is no thrust inner member 88, the roller 87 can be easily inserted. A thrust inner member 88 is fitted to the outer periphery of the inner cylindrical portion 25, and the thrust inner member 88 is brought into contact with the step portion of the inner cylindrical portion 25 in the axial direction.

  The second angular retainer 46 is inserted between the first inner member 22 and the second outer member 35 in the axial direction, and a plurality of second balls 45 are sequentially inserted into the second angular retainer 46. As a result, the plurality of second balls 45 are in contact with the second outer raceway surface 35 a, and the second angular cage 46 is coaxially disposed with respect to the second outer member 35. At this time, since there is no second inner member 27, the insertion operation of the second ball 45 can be performed easily. The second inner member 27 is inserted into the first inner member 22 in the axial direction, and the second inner member 27 is press-fitted to the outer periphery of the inner cylindrical portion 25. Using a tool, a notch 22b is made in the other end surface of the inner cylindrical portion 25, and a part of the outer periphery of the other end of the inner cylindrical portion 25 is caulked to the outer diameter side. Thus, the second inner member 27 can be prevented from coming off from the inner cylindrical portion 25.

  The inner periphery of the mounting portion 11 of the brake rotor 10 is press-fitted into the outer periphery of the fitting portion 24 of the inner member 21, and the brake rotor 10 is fixed to the inner member 21. A part of the connecting bolt 51 is inserted into the attached hole 23 a of the inner member 21 and the first through hole 11 a of the brake rotor 10, and the selection portion 53 of the connecting bolt 51 is inserted into the attached hole 23 a of the inner member 21. And the connecting bolt 51 is fixed to the inner member 21.

  The outer periphery of the second outer cylindrical portion 36 of the outer member 30 is fitted to the inner periphery of the knuckle arm 75, and the other side surface of the second outer flange 37 is brought into contact with the one side surface of the knuckle arm 75. Make contact. The outer member 30 and the knuckle arm 75 are integrated via the mounting bolt 60. A notch (not shown) through which the mounting bolt 60 can be inserted is formed in the inner flange 23 of the inner member 21 and the mounting portion 11 of the brake rotor 10.

  The caliper is fitted into the flange portion 13 and a part of the disc portion 14 from the outer diameter side of the flange portion 13, and the caliper is attached to the knuckle arm 75.

  The shaft portion 72 of the constant velocity joint 70 is spline-fitted to the inner periphery of the inner cylindrical portion 25 of the inner member 21. A locking nut 73 is screwed onto the shaft portion 72, and the inner member 21 is sandwiched between the hook-shaped portion 71 and the locking nut 73 in the axial direction.

  The knuckle arm 75 is connected to the output side of the electric power steering apparatus.

  The inner periphery of the wheel 80 is loosely fitted to the outer periphery of the fitting portion 24, the connection bolt 51 of the connection mechanism 50 is inserted into the mounting hole 80 a of the wheel 80, and the connection nut 55 is screwed into the connection bolt 51. Thus, the drive snake wheel is attached to the wheel bearing device 20.

  Next, the overall operation will be described based on the above-described configuration.

  The rotational power of the engine is transmitted to the drive serpentine wheel and the brake rotor 10 via the constant velocity joint 70 and the inner member 21.

  When the inner member 21 rotates relative to the outer member 30, the first ball 40 rolls on the first outer raceway surface 31a and the first inner raceway surface 22a, and the second outer use The second ball 45 rolls on the raceway surface 35a and the second inner raceway surface 27a, and the roller 87 rolls on the outer thrust surface and the inner thrust surface.

  The first angular ball bearing constituted by the first outer raceway surface 31 a, the first inner raceway surface 22 a, the first ball 40, and the first angular cage 42 allows radial load, thrust load, and moment load to be generated. Take it.

  A radial load, a thrust load, and a moment load are generated by the second angular contact ball bearing constituted by the second outer raceway surface 35a, the second inner raceway surface 27a, the second ball 45, and the second angular cage 46. Take it.

  A thrust load and a moment load are received by a thrust roller bearing 85 including an outer thrust surface, an inner thrust surface, rollers 87, and a thrust cage 89.

  Since the wheel bearing device 20 is disposed in a limited space between the knuckle arm 75 and the drive snake wheel, the axial length of the wheel bearing device 20 is also limited. By disposing the thrust roller bearing between the first angular ball bearing and the second angular ball bearing, the axial distance between the first angular ball bearing and the second angular ball bearing can be increased, and the moment rigidity is greatly increased. The moment rigidity is further increased by providing the thrust roller bearing. Thus, since the moment rigidity of the wheel bearing device 20 is greatly increased, there are many unpaved roads in emerging countries, and the left and right unbalance of the ruins of the wheels is large, and the vehicle body is greatly inclined and a large moment load is applied. Even if it takes, it can withstand enough.

  The present invention is not limited to these embodiments, and can of course be implemented in various modes without departing from the gist of the present invention.

  In the above embodiment, the first ball 40 and the second ball 45 are used as the rolling elements of the wheel bearing device 20. In another embodiment, a tapered roller may be used as the rolling element of the wheel bearing device 20 instead of the first ball 40 and the second ball 45.

  In the above embodiment, the outer periphery of the first outer flange 33 of the first outer member 31 is press-fitted and fitted into the inner periphery of the fitting portion 38 formed in the second outer member 35. In another embodiment, the outer periphery of the second outer flange 37 of the second outer member 35 may be press-fitted into the inner periphery of the fitting portion formed in the first outer member 31.

  In the above-described embodiment, the wheel bearing device 20 is used for supporting the rotation of the drive snake wheel, and the inner member 21 is rotated with the outer member 30 stopped. In another embodiment, the wheel bearing device 20 may be used to support the rotation of the driven non-snaked wheel, and the outer member 30 may be rotated while the inner member 21 is stopped. In this case, the knuckle arm 75 and the constant velocity joint 70 are not used. The driven non-steering wheel is attached to the outer member 30, and the inner member 21 is attached to the suspension arm.

20: Wheel bearing device, 21: Inner member, 22a: First inner raceway surface, 27a: Second inner raceway surface, 30: Outer member, 31a: First outer raceway surface, 35a : Second outer raceway surface, 40: first ball (first rolling element), 45: second ball (second rolling element), 87: roller (third rolling element)

Claims (5)

An outer member having a pair of outer raceway surfaces formed on the inner periphery, an inner member disposed on the inner periphery side of the outer member and having a pair of inner raceway surfaces formed on the outer periphery, and the pair of A plurality of first rolling elements and a plurality of second rolling elements that roll between the outer raceway surface and the pair of inner raceway surfaces, and a wheel on one of the outer member and the inner member; In the wheel bearing device in which the other is attached to the vehicle body,
An outer thrust surface extending radially between the pair of outer raceway surfaces is formed on the outer member, and the inner member extends radially between the pair of inner raceway surfaces. A wheel bearing device, characterized in that a thrust surface is formed and a plurality of third rolling elements rolling between the outer thrust surface and the inner thrust surface are arranged. The inner member includes a first inner member that forms one of the pair of inner raceways, and a second inner member that forms the other of the pair of inner raceways. The wheel bearing device according to claim 1, wherein a second inner member is axially inserted and fixed to the outer periphery of the first inner member. The inner member includes a third inner member that is axially sandwiched between the first inner member and the second inner member, and the inner thrust surface is formed on the third inner member. The wheel bearing device according to claim 2, wherein the wheel bearing device is provided. The outer member includes a first outer member that forms one of the pair of outer raceway surfaces and a second outer member that forms the other of the pair of outer raceway surfaces. 4. The wheel bearing device according to claim 1, wherein the first outer member is axially inserted and fixed to the second outer member. 5. The wheel bearing device according to claim 4, wherein the outer thrust surface is formed on the second outer member.

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