JP2014180956A - Wheel bearing device with brake rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wheel bearing device with a brake rotor which avoids load concentration on the brake rotor, and improves the strength of the brake rotor.SOLUTION: A wheel bearing device with a brake rotor has an outer member 30, an inner member 21 disposed on an inner peripheral side of the outer member 30, a plurality of rolling bodies 40 and 41 rolling between the outer member 30 and the inner member 21, and a brake rotor 10 fixed to a flange portion 23 of the inner member 21. The flange portion 23 extends in an outer diametrical direction, and the plurality of flange portions 23 is disposed at intervals in a circumferential direction. The flange portion 23 has width in a direction orthogonal to the outer diametrical direction, and edges on both sides in a width direction. A disc-shaped spacer 90 is interposed between the brake rotor 10 and the flange portion 23. One side surface of the spacer 90 is closely contacted with a side surface of the brake rotor 10, and the other side surface of the spacer 90 is closely contacted with a side surface of the flange portion 23.

Description

  The present invention relates to a wheel bearing device with a brake rotor.

  In the conventional wheel bearing device, as shown in Patent Document 1, a brake rotor is attached to a flange portion of the wheel bearing device via a connecting bolt. The flange portions extending in the outer diameter direction are arranged at equal intervals in the circumferential direction for weight reduction, and there is no thickness between the pair of flange portions. The flange portion has a tangential width at a certain point in the circumferential direction, and has edges on both sides of the tangential direction. On the side surface on the flange portion side of the brake rotor, a dullness is provided between the pair of flange portions. In order to prevent the edge of the flange portion from hitting the brake rotor, the relief is provided to a position beyond the edge of the flange portion. This prevents the force transmitted from the brake rotor to the flange portion when the brake is applied from being concentrated at the edge.

JP 2009-58103 A

  There is a problem that the strength of the brake rotor is low because the dullness is not provided between the pair of flange portions but to the position beyond the edge of the flange portion.

  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 with a brake rotor that avoids concentration of load on the brake rotor and increases the strength of the brake rotor. Is to provide.

  In order to solve the above problems, a wheel bearing device with a brake rotor includes an outer member, an inner member disposed on the inner peripheral side of the outer member, and the outer member and the inner member. A plurality of rolling elements that move, and a brake rotor that is fixed to a flange portion of the inner member, the flange portions extending in an outer diameter direction and arranged in a plurality in a circumferential direction, In the wheel bearing device with a brake rotor, the flange portion has a width in a direction orthogonal to the outer diameter direction and edges on both sides in the width direction, and a disc-shaped spacer is interposed between the brake rotor and the flange portion. And one side surface of the spacer is in close contact with the side surface of the brake rotor, and the other side surface of the spacer is in close contact with the side surface of the flange portion.

  According to the present invention, since the load concentration is received by the spacer, it is possible to avoid the load concentration on the brake rotor, and further, since no dullness is provided on the side surface of the brake rotor, the brake rotor wheel for which the strength of the brake rotor is increased is provided. A bearing device can be provided.

It is an attachment state figure to the knuckle arm of the wheel bearing device with a brake rotor concerning one embodiment of the present invention. It is the sectional view on the AA line of FIG. 1 concerning one Embodiment of this invention. It is the BB sectional drawing of FIG. 2 concerning one Embodiment of this invention.

  A first embodiment of the present invention will be described with reference to FIGS. 1 is a view showing a state in which a wheel bearing device with a brake rotor is attached to a knuckle arm, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is a sectional view taken along line BB in FIG.

  As shown in FIG. 1, the wheel bearing device 20 is attached to a knuckle arm 75 via a mounting bolt 60. The spacer 90 and the brake rotor 10 are fixed to the wheel bearing device 20, and driving wheels are attached to the wheel bearing device 20 via a coupling mechanism 50, and the wheel bearing device 20 has a constant velocity. A 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 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 wheel is attached to the wheel bearing device 20 by inserting the connection bolt 51 of the connection mechanism 50 into the attachment hole 80 a 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.

  The wheel bearing device 20 rolls between the outer member 30 attached to the knuckle arm 75, the inner member 21 disposed on the inner peripheral side of the outer member 30, and the outer member 30 and the inner member 21. Balls 40 and 41 to be held, and a plurality of balls 40 and 41 to hold the balls 40 and 41 rotatably at intervals in the circumferential direction. There are cages arranged in a row consisting of a plurality of balls 40 and cages arranged in a row consisting of a plurality of balls 41. The wheel bearing device 20 is also a two-row angular contact ball bearing. The outer member 30, the inner member 21, and the balls 40 and 41 are made of iron, and the cage is made of resin. The outer member 30 and the inner member 21 are formed into rough shapes by forging, and are processed to have predetermined dimensions by cutting and grinding.

  The outer member 30 includes a cylindrical outer cylindrical portion 31 and an outer flange 32 extending in the outer diameter direction from the outer periphery of the outer cylindrical portion 31. In order to reduce the weight, a plurality of outer flanges 32 are formed in the circumferential direction, and there is no thickness between the pair of outer flanges 32. The outer periphery of the outer cylindrical portion 31 is fitted to the inner periphery of the knuckle arm 75, and the other side surface of the outer flange 32 is in contact with the one side surface of the knuckle arm 75. The outer flange 32 is attached to the knuckle arm 75 via the attachment bolt 60.

  As shown in FIGS. 1 to 3, the inner member 21 includes a cylindrical inner cylindrical portion 22, an inner flange 23 extending in the outer diameter direction from the outer periphery of one end of the inner cylindrical portion 22, And a cylindrical fitting portion 24 extending in the axial direction from one end of the cylindrical portion 22 for use.

  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. The inner flange 23 has a width in the circumferential direction of the inner member 21. Strictly speaking, the inner flange 23 has a width Wa in a tangential direction of a certain point in the circumferential direction of the inner member 21. A certain point corresponds to the center line of the mounting hole 23a. 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. On the side surface of the inner flange 23 on the brake rotor 10 side, there are edges 23b having a right-angle cross section on both sides in the width direction.

  The spacer 90 has a disk shape. The inner periphery of the spacer 90 is press-fitted to the outer periphery of the fitting portion 24 of the inner member 21, and the spacer 90 is fixed to the inner member 21. The spacer 90 is interposed between the inner flange 23 and the brake rotor 10. One side surface 92 in the axial direction of the spacer 90 is in close contact with the side surface of the brake rotor, and the other side surface 93 in the axial direction of the spacer 90 is in close contact with the side surface of the inward flange 23. A second through hole 91 is formed in the spacer 90 so as to penetrate in the axial direction at a position corresponding to the mounting hole 80 a of the wheel 80.

  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.

  Since no edge exists between the side surface on the inner flange 23 side of the mounting portion 11 and the side surface 92 of the spacer 90, concentrated load does not act on the mounting portion 11. The edges 23 b of the inner flange 23 are located on both sides in the width direction in the width direction of the inner flange 23, and are located on the spacer 90 side in the axial direction of the inner member 21. Edge contact by the edge 23 b of the inner flange 23 does not act on the brake rotor 10 but acts on the spacer 90.

  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.

  As shown in FIGS. 1 to 3, 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 composed of 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 22 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 | attachment operation | movement of the wheel bearing apparatus 20 with respect to the knuckle arm 75 and a drive wheel based on the structure mentioned above is demonstrated.

  A description will be given from a state in which the wheel bearing device 20 in which the outer member 30, the inner member 21, the balls 40 and 41, and the cage are integrally assembled is prepared.

  The inner periphery of the spacer 90 is press-fitted into the outer periphery of the fitting portion 24 of the inner member 21, and the spacer 90 is fixed to the inner member 21. Subsequently, the inner periphery of the mounting portion 11 of the brake rotor 10 is press-fitted to the outer periphery of the fitting portion 24 of the inner member 21 to fix the brake rotor 10 to the inner member 21. Accordingly, one side surface 92 in the axial direction of the spacer 90 is in close contact with the side surface of the brake rotor, and the other side surface 93 in the axial direction of the spacer 90 is in close contact with the side surface of the inward flange 23. A part of the connecting bolt 51 is inserted into the mounting hole 23a of the inner member 21, the second through hole 91 of the spacer 90, and the first through hole 11a of the brake rotor 10, and the mounting hole 23a of the inner member 21 is inserted. The selection portion 53 of the connecting bolt 51 is press-fitted into the inner member 21 and the connecting bolt 51 is fixed to the inner member 21.

  The outer periphery of the outer cylindrical portion 31 of the outer member 30 is fitted to the inner periphery of the knuckle arm 75, and the other side surface of the outer flange 32 is brought into contact with the one side surface of the knuckle arm 75. The outer flange 32 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 22 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. Drive wheels are 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 wheel and the brake rotor 10 via the constant velocity joint 70 and the inner member 21.

  When the brake is applied while the driving wheel and the brake rotor 10 are rotating, the flange portion 13 and the disc portion 14 are sandwiched between the pair of brake pads. A force for stopping the rotation of the brake rotor 10 is transmitted to the drive wheel and the constant velocity joint 70. As a result, between the side surface on the inner flange 23 side of the mounting portion 11 and one side surface 92 in the axial direction of the spacer 90, between the other side surface 93 in the axial direction of the spacer 90 and the side surface of the inner flange 23, A force in the rotational direction of the brake rotor 10 and a rotational moment around a certain axis act. These forces are received by the entire contact surface between the side surface on the inner flange 23 side of the mounting portion 11 and the one side surface 92 of the spacer 90 in the axial direction and do not hit the edge, so load concentration on the brake rotor 10 Can be avoided. A certain axis is an axis connecting the rotation axis of the brake rotor 10 and the caliper. Edge contact by the edge 23 b of the inner flange 23 acts on the spacer 90 and does not act on the attachment portion 11.

  Since no dullness is provided on the side surface on the inner flange 23 side, the brake rotor can have sufficient strength.

  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, a disc-shaped brake rotor 10 is used. In another embodiment, a drum-shaped brake rotor 10 may be used. That is, a cup-shaped one may be used.

  In the above embodiment, balls 40 and 41 are used as 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.

  In the above embodiment, the mounting bolt 60 is inserted into the outer flange 32 from the brake rotor 10 side, and the outer flange 32 and the knuckle arm 75 are integrated. In other embodiments, the outer flange 32 and the knuckle arm 75 may be integrated by inserting the mounting bolt 60 into the knuckle arm 75 from the side opposite to the brake rotor 10. In this case, it is not necessary to form a notch (not shown) through which the mounting bolt 60 can be inserted in the inner flange 23 of the inner member 21 and the mounting portion 11 of the brake rotor 10.

  In the above-described embodiment, the example in which the inner periphery of the attachment portion 11 of the brake rotor 10 is press-fitted to 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 has been described. In another embodiment, the inner periphery of the mounting portion 11 of the brake rotor 10 is loosely fitted to the outer periphery of the fitting portion 24 of the inner member 21, and the mounting portion 11 of the brake rotor 10 corresponds to the mounting hole 80 a of the wheel 80. A mounting hole is formed at a position to be formed, a through hole is formed in the inner flange 23 at a position corresponding to the mounting hole 80a of the wheel 80, and the selection portion of the connecting bolt 51 is connected to the mounting hole through the through hole. The brake rotor 10 may be fixed to the inner member 21 by press-fitting 53.

  In the above embodiment, the brake rotor 10 is formed into a rough shape by casting, and is processed to have a predetermined size by cutting and grinding. In another embodiment, the brake rotor 10 is formed so that a large portion except for the disk portion 14 is formed into a rough shape by forging, the disk portion 14 is welded to a large portion, and is processed to a predetermined size by cutting and grinding. You may do it.

10: Brake rotor, 20: Wheel bearing device, 21: Inner member, 23: Inner flange (flange), 30: Outer member, 40: Ball (rolling element), 41: Ball (rolling element) , 90: Spacer, 92: Side, 93: Side

Claims (1)

An outer member, an inner member disposed on the inner peripheral side of the outer member, a plurality of rolling elements that roll between the outer member and the inner member, and a flange portion of the inner member A plurality of flange portions extending in the outer diameter direction and spaced apart in the circumferential direction, and the flange portions have a width in a direction perpendicular to the outer diameter direction. Then, in the wheel bearing device with a brake rotor having edges on both sides in the width direction,
A disc-shaped spacer is interposed between the brake rotor and the flange portion, one side surface of the spacer is brought into close contact with the side surface of the brake rotor, and the other side surface of the spacer is brought into close contact with the side surface of the flange portion. A wheel bearing device with a brake rotor, characterized in that.

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