WO2014115914A1

WO2014115914A1 - Wheel bearing and wheel bearing assembly using same

Info

Publication number: WO2014115914A1
Application number: PCT/KR2013/000636
Authority: WO
Inventors: 송재명; 방상지; 김완태
Original assignee: 주식회사 일진글로벌
Priority date: 2013-01-25
Filing date: 2013-01-25
Publication date: 2014-07-31
Also published as: KR20150135236A

Abstract

The present invention relates to a wheel bearing of which the durability and quality can be improved and a wheel bearing assembly using the same. The wheel bearing, according to one embodiment of the present invention, comprises: a hub formed in a cylindrical shape and having a wheel flange provided to one end portion in a radially outward direction, a stepped portion provided to the outer peripheral surface of the other end portion and a first inner wheel orbit provided between the flange and the stepped portion; an inner wheel provided to the stepped portion of the hub and having a second inner wheel orbit provided to the outer peripheral surface thereof; an outer wheel surrounding the hub and the inner wheel so as to form a space between the hub and the inner wheel and having first and second outer wheel orbits provided to the inner peripheral surface thereof corresponding to the first and second inner wheel orbits;a plurality of bearings provided to be slidable between the first and second inner wheel orbits and the first and second outer wheel orbits; and a nut screw-coupled to the stepped portion of the hub at one side of the axial direction of the inner wheel so as to push the inner wheel to the other side of the axial direction, thereby applying a pre-load to the bearings, wherein at least a part of the inner wheel is screw-coupled to the stepped portion, and the inner wheel and the nut rotate in the opposite direction from each other so as to be respectively screw-coupled to the stepped portion.

Description

Wheel Bearings and Wheel Bearing Assemblies Using the Same

The present invention relates to a wheel bearing and a wheel bearing assembly using the same, and more particularly, to a wheel bearing and a wheel bearing assembly using the same that can improve the durability and quality of the wheel bearing.

In general, a bearing is a device mounted between a rotating element and a non-rotating element to facilitate the rotation of the rotating element. Currently, various bearings such as roller bearings, tapered bearings and needle bearings are used.

A wheel bearing is a kind of such a bearing, and rotatably connects a wheel, which is a rotating element, to a vehicle body, which is a non-rotating element. The wheel bearing includes an inner ring (and / or hub) connected to one of the wheels or the vehicle body, an outer ring connected to the other of the wheel or the vehicle body, and a rolling element interposed between the outer ring and the inner ring.

Conventional wheel bearing assembly has a hub for receiving the rotational force through the spindle of the constant velocity joint to transmit to the wheel, the inner ring is installed on the outer peripheral surface of the hub, the outer ring surrounding the hub and the inner ring, the hub and the inner ring and the It includes a plurality of rolling elements provided between the outer ring.

The wheel bearing assembly is such that the hub is splined (or serrated) with the spindle of the constant velocity joint to receive rotational force. That is, splines are formed in the inner circumferential surface of the hub and the outer circumferential surface of the spindle, and the inner circumferential surface of the hub and the outer circumferential surface of the spindle are splined.

In addition, the conventional wheel bearing assembly is pre-loaded to the rolling element to improve the life. In the case of the prior art, after the inner ring is pressed into the stepped portion formed in the hub, one end of the hub is bent radially outward to fix the inner ring and the preload is applied to the rolling element (the method is known as' orbital in the art. forming).

However, when preloading the wheel bearing by orbital forming, strong pressure is applied to the inner ring and there is a problem of causing deformation.

In addition, in the case of the conventional wheel bearing assembly, a clearance exists between the splines of the hub and the constant velocity joint, which causes the occurrence of noise and defects due to the increase in clearance caused by the load generated during driving of the vehicle (ie, rotational force, etc.). There was a problem.

Furthermore, when preloading with a nut instead of orbital forming, there was a problem that the nut was loosened and the preload could not be maintained while using the wheel bearing assembly.

Accordingly, the present invention has been made to solve the problems described above, screwing the at least a portion of the hub and the inner ring and the nut and the nut for applying a preload to the rolling element through the inner ring, and the coupling of the inner ring It is to provide a wheel bearing and a wheel bearing assembly using the same which allow at least a portion and a nut to rotate in opposite directions and to be screwed to the hub to maintain a preload.

In addition, to provide a wheel bearing and a wheel bearing assembly using the same by essentially combining the hub and the constant velocity joint through a facial spline.

The wheel bearing according to the embodiment of the present invention has a cylindrical shape, a wheel flange is formed radially outward at one end, a stepped portion is formed at the outer peripheral surface of the other end, and a first inner ring raceway is formed between the flange and the stepped portion. Herb; An inner ring mounted to a stepped portion of the hub and having a second inner ring track formed on an outer circumferential surface thereof; An outer ring surrounding the hub and the inner ring so as to form a space between the hub and the inner ring and having first and second outer ring tracks corresponding to the first and second inner ring tracks on an inner circumferential surface thereof; A plurality of rolling elements slidably mounted between the first and second inner raceways and the first and second outer raceways; And a nut adapted to preload the rolling element by pushing the inner ring to one side in the axial direction by screwing the stepped portion of the hub at the other axial side of the inner ring, wherein at least a portion of the inner ring is screwed to the stepped portion. The inner ring and the nut may be rotated in opposite directions to be screwed to the stepped portions, respectively.

A first spline may be formed at the other end of the hub so as to be coupled to the constant velocity joint to receive the rotational force from the constant velocity joint.

The inner circumferential surface of the inner ring may include a screw portion for screwing the stepped portion and a press-fit portion pressed into the stepped portion.

The inner ring may be formed with a holder for screwing the screw portion to the stepped portion.

The tooth of the first spline may be formed in the ridge portion is a trapezoidal plane, the bone portion may be formed in a predetermined width curved surface.

Nuts, polygonal portions or non-circular portions may be formed on the outer circumferential surface of the nut.

The wheel bearing may further comprise a center bolt adapted to screw the hub with the constant velocity joint to engage the hub with the constant velocity joint.

The wheel bearing assembly according to another embodiment of the present invention has a cylindrical shape, a wheel flange is formed radially outward at one end, and a stepped portion is formed at the outer peripheral surface of the other end, and a first inner ring raceway is formed between the flange and the stepped portion. A hub having a first spline formed at the other end thereof; An inner ring mounted to a stepped portion of the hub and having a second inner ring track formed on an outer circumferential surface thereof; An outer ring surrounding the hub and the inner ring so as to form a space between the hub and the inner ring and having first and second outer ring tracks corresponding to the first and second inner ring tracks on an inner circumferential surface thereof; A plurality of rolling elements slidably mounted between the first and second inner raceways and the first and second outer raceways; A constant velocity joint having a second spline coupled to the first spline at one end thereof so as to transmit rotational force to the hub, and a center bolt hole formed at a center thereof; A center bolt screwed into a center bolt hole of the constant velocity joint to couple the hub to the constant velocity joint; And a nut adapted to preload the rolling element by pushing the inner ring to one side in the axial direction by screwing the stepped portion of the hub at the other axial side of the inner ring, wherein at least a portion of the inner ring is screwed to the stepped portion. The inner ring and the nut are rotated in opposite directions to each other to be screwed to the stepped portion.

The teeth of the second spline may be formed in a rectangular planar portion and a pubic portion may be formed in a curved surface.

A lip may be formed between the nut and the constant velocity joint to prevent intrusion of foreign matter.

As described above, according to embodiments of the present invention, the hub and at least a portion of the inner ring screwed and the nut and a nut for preloading the rolling element through the inner ring and the hub and screwed, at least a portion of the inner ring and the nut By rotating in opposite directions and screwed to the hub, preload can be maintained even when the wheel bearing assembly is used for a long time.

In addition, the hub and constant velocity joints can be combined via facial splines to fundamentally eliminate noise generation.

1 is a cross-sectional view of a wheel bearing according to an embodiment of the present invention.

2 is a cross-sectional view of a wheel bearing assembly according to an embodiment of the present invention.

3 is a schematic diagram showing teeth of a first spline applied to a wheel bearing assembly according to an embodiment of the present invention.

4 is a schematic diagram showing teeth of a second spline applied to a wheel bearing assembly according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail as follows.

1 is a cross-sectional view of a wheel bearing according to an embodiment of the present invention, Figure 2 is a cross-sectional view of a wheel bearing assembly according to an embodiment of the present invention.

1 and 2, the wheel bearing assembly 1 according to the embodiment of the present invention includes a hub 10, an inner ring 30, an outer ring 20, and

rolling elements

50 and 60 in first and second rows. ), A nut 40, a constant velocity joint 80, and a center bolt 90.

The hub 10 rotates by receiving rotational force from the constant velocity joint 80 and is coupled to one end of the constant velocity joint 80 so that power can be transmitted.

A wheel flange 12 protrudes outward from a radius at one end of the hub 10, and a hub bolt hole 14 for coupling with a wheel (not shown) is formed at the wheel flange 12. .

A step portion 16 is formed on the outer circumferential surface of the other end of the hub 10, and the inner ring 30 is mounted to the step portion 16. A first inner raceway 15 is formed between the wheel flange 12 of the hub 10 and the stepped portion 16.

The hub 10 is formed in a cylindrical shape, and a center bolt hole 13 through which the center bolt 90 penetrates in the axial direction is formed on an inner circumferential surface thereof. In addition, a first spline 18 is formed at the other end of the hub 10, and the first spline 18 is spline-coupled with the second spline 84 formed at the constant velocity joint 80 to form a constant velocity joint 80. ) To receive the rotational force.

The inner ring 30 is formed in a cylindrical shape and is mounted in a hybrid manner on the stepped portion 16 of the hub 10. That is, the inner peripheral surface of the inner ring 30 is provided with a screw portion 32 and the press-in portion 34, the screw portion 32 is screwed with the step 16, the press-in portion 34 The stepped part 16 is press-fitted. The inner ring 30 is coupled to the stepped portion 16 by screwing and press-fitting to easily apply preload to the rolling elements and prevent the inner ring 30 from being separated from the stepped portion 16 primarily. Done.

A second inner ring raceway 38 is formed on an outer circumferential surface of the inner ring 30, and a holder 36 is formed on the inner ring 30. The screw portion 32 is screwed to the stepped portion 16 by inserting a tool into the holder 36 to rotate the inner ring 30.

The outer ring 20 is located outside the radius of the hub 10 and the inner ring 30 and surrounds the hub 20 and the inner ring 30. A space is formed between the outer ring 20, the hub 10, and the inner ring 30, and the space is sealed by the first and second sealing members 70 and 72.

The outer ring flange 22 extends radially outward on the outer circumferential surface of the outer ring 20, and the outer ring flange 22 is mounted to the vehicle body.

First and second outer ring raceways 24 and 26 corresponding to the first and second

inner ring raceways

15 and 38 are formed on the inner circumferential surface of the outer ring 20.

The

rolling bodies

50 and 60 of the first and second rows are mounted between the hub 10 and the inner ring 30 and the outer ring 20. That is, the rolling elements 50 in the first row are slidably mounted between the first inner ring raceway 15 and the first outer ring raceway 24, and the rolling elements 60 in the second row are arranged in the second row. It is mounted so that sliding is possible between the inner ring raceway 38 and the second outer ring raceway 26. Accordingly, the rolling

elements

50 and 60 in the first and second rows allow the hub 10 to rotate relative to the outer ring 20.

Typically, the first and second rows of rolling

elements

50 and 60 are formed by inserting a plurality of rolling elements into the first and

second retainers

52 and 62 formed of a plastic material.

The nut 40 is screwed to the stepped portion 16 of the hub 10 at the other axial side of the inner ring 30. The nut 40 is screwed to the step portion 16 to push the inner ring 30 to one side in the axial direction to apply preload to the rolling

bodies

50 and 60 in the first and second rows. At this time, the nut 40 is screwed to the step portion 16 by rotating in the direction opposite to the rotation direction of the inner ring (30). That is, the nut 40 and the inner ring 30 are rotated in opposite directions to each other and screwed to the stepped portion 16 so that the nut 40 and the inner ring 30 are released from the stepped portion 16. Is prevented. Accordingly, the preload applied to the rolling

bodies

50 and 60 in the first and second rows can be maintained.

A nut tooth 42 is formed on an outer circumferential surface of the nut 40, and the nut 40 is screwed to the stepped part 16 by coupling the tool to the nut tooth 42 to rotate the nut 40. can do. However, the technical idea of the present invention is not limited to the fact that the nut tooth 42 is formed on the outer circumferential surface of the nut 40, and the outer circumferential surface of the nut 40 is formed of a polygonal or non-circular part, which is also included in the technical idea of the present invention. Should be interpreted as.

The constant velocity joint 80 is a member that transmits rotational force to the hub 10. A second spline 84 is formed at one end surface of the constant velocity joint 80 to spline and couple the first spline 18 formed on the hub 10. Here, the first and

second splines

18 and 84 extend radially with respect to the rotation axis. This type of spline is referred to in the art as a facial spline.

A bolt hole 82 is formed at the central portion of one end surface of the constant velocity joint 80. In addition, one end surface of the constant velocity joint 80 is spaced apart from the nut 40 by a predetermined gap. That is, by preventing the constant velocity joint 80 and the nut 40 from directly contacting each other, noise due to torsional contact may be prevented.

In addition, the lip 100 may be disposed between the constant velocity joint 80 and the nut 40 to prevent foreign matter from entering. The lip 100 may be made of synthetic resin or rubber with elasticity.

Meanwhile, the constant velocity joint 80 may be a joint housing or a drive shaft of the constant velocity joint.

The center bolt 90 passes through the center bolt hole 13 of the hub 10 and is fastened to the bolt hole 82 formed at the center of the constant velocity joint 80. At this time, the head portion of the center bolt 90 is supported on one side of the hub (10). Accordingly, the hub 10 is fixed in the axial direction with the constant velocity joint 80. In addition, the center bolt 90 strongly couples the hub 10 and the constant velocity joint 80, thereby strengthening the coupling between the first and

second splines

18 and 84. Therefore, the rotational force of the constant velocity joint 80 is smoothly transmitted to the hub 10, and also reduces noise that may occur between the first and

second splines

18 and 84.

On the other hand, the first spline 18 and the second spline 84, the surfaces facing each other are meshed in the axial direction.

That is, as shown in FIG. 3, the first spline 18 is formed to protrude along the circumference of the other end surface of the hub 10, and the width w1 and the height h1 gradually increase along the radial direction. Larger trapezoidal teeth.

In this case, the teeth of the first spline 18 are formed with the dentification portion 18a in a trapezoidal plane, and the curved portion R of the pubic portion 18b has a predetermined width w.

In addition, as shown in FIG. 4, the second spline 84 is formed to protrude so as to correspond to the teeth of the first spline 18 along the circumference of one end surface of the constant velocity joint 80 and in a radial direction. It has a trapezoidal tooth shape in which the width (w2) and the height (h2) is increased along.

However, in the teeth of the second spline 84, the dentition portion 84a is formed in a rectangular plane, and the pubic portion 84b is formed with a curved surface R at both sides thereof.

The first and

second splines

18 and 84 may have teeth of various shapes, but the heights h1 and h2 of the teeth may be gradually increased along the radial direction in order to stably transmit the rotational force. This has the advantage of ensuring a wide contact surface to support large rotational forces outside the radius.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and easily changed and equalized by those skilled in the art from the embodiments of the present invention. It includes all changes to the extent deemed acceptable.

Claims

A hub having a cylindrical shape, a wheel flange formed radially outwardly at one end thereof, a stepped portion formed at an outer circumferential surface of the other end thereof, and a first inner ring raceway formed between the flange and the stepped portion;

An inner ring mounted to a stepped portion of the hub and having a second inner ring track formed on an outer circumferential surface thereof;

An outer ring surrounding the hub and the inner ring so as to form a space between the hub and the inner ring and having first and second outer ring tracks corresponding to the first and second inner ring tracks on an inner circumferential surface thereof;

A plurality of rolling elements slidably mounted between the first and second inner raceways and the first and second outer raceways; And

A nut adapted to preload the rolling element by screwing the inner ring to one side in the axial direction by screwing the stepped portion of the hub at the other axial side of the inner ring;

Including;

And at least a portion of the inner ring is screwed to the stepped portion, and the inner ring and the nut are rotated in opposite directions to each other to be screwed to the stepped portion.
The method of claim 1,

Wheel bearing, characterized in that the other end of the hub is formed with a first spline to be coupled to the constant velocity joint to receive a rotational force from the constant velocity joint.
The method of claim 1,

The inner circumferential surface of the inner ring is provided with a screw portion for screwing the stepped portion and a press-fitting portion pressed into the stepped portion.
The method of claim 3,

And a holder for screwing the threaded portion to the stepped portion in the inner ring.
The method of claim 2,

The tooth of the first spline is a tooth bearing portion is formed in a trapezoidal plane, the bone portion is a wheel bearing, characterized in that the curved surface of a predetermined radius is formed in a predetermined width.
The method of claim 1,

Wheel bearing, characterized in that the nut, a polygonal portion or a non-circular portion is formed on the outer peripheral surface of the nut.
The method of claim 1,

And a center bolt adapted to screw the hub with the constant velocity joint to engage the hub with the constant velocity joint.
Hub having a cylindrical shape, a wheel flange is formed radially outward at one end, a stepped portion is formed at the outer peripheral surface of the other end, a first inner ring orbit is formed between the flange and the stepped portion, the first spline is formed at the other end ;

An inner ring mounted to a stepped portion of the hub and having a second inner ring track formed on an outer circumferential surface thereof;

An outer ring surrounding the hub and the inner ring so as to form a space between the hub and the inner ring and having first and second outer ring tracks corresponding to the first and second inner ring tracks on an inner circumferential surface thereof;

A plurality of rolling elements slidably mounted between the first and second inner raceways and the first and second outer raceways;

A constant velocity joint having a second spline coupled to the first spline at one end thereof so as to transmit rotational force to the hub, and having a center bolt hole formed at a center thereof;

A center bolt screwed into a center bolt hole of the constant velocity joint to couple the hub to the constant velocity joint; And

A nut adapted to preload the rolling element by screwing the inner ring to one side in the axial direction by screwing the stepped portion of the hub at the other axial side of the inner ring;

Including;

And at least a portion of the inner ring is screwed to the stepped portion, and the inner ring and the nut are rotated in opposite directions to each other to be screwed to the stepped portion.
The method of claim 8,

The inner circumferential surface of the inner ring is provided with a screw portion for screwing the stepped portion and the press-fitting portion pressed into the stepped portion.
The method of claim 9,

Wheel bearing assembly, characterized in that the inner ring is formed with a holder for screwing the screw portion to the stepped portion.
The method of claim 8,

The tooth of the first spline is a tooth bearing portion is formed in a trapezoidal plane, the bone portion is a wheel bearing assembly, characterized in that the curved surface of a predetermined radius is formed in a predetermined width.
The method of claim 8,

The tooth of the second spline is a wheel bearing assembly, characterized in that the tooth portion is formed in a rectangular plane, the pubic portion is formed in a curved surface.
The method of claim 8,

Wheel bearing assembly, characterized in that the outer peripheral surface of the nut nut, polygonal portion or non-circular portion is formed.
The method of claim 8,

Wheel bearing assembly, characterized in that the lip is formed between the nut and the constant velocity joint to prevent the entry of foreign matter.