KR102646826B1 - Hub bolt for mounting wheel to wheel hub and wheel bearing provided therewith - Google Patents

Abstract

According to one embodiment of the present invention, a hub bolt used to mount a wheel to a wheel hub of a wheel bearing is provided. The hub bolt according to an embodiment of the present invention includes a head portion formed on one side, a coupling portion disposed axially spaced from the head portion and having serrations formed on the outer peripheral surface, and an extension formed to extend axially from the coupling portion. It may include a protrusion formed to protrude in the radial direction from the outer peripheral surface between the head portion and the serrations of the coupling portion.

Description

Hub bolt used to mount a wheel to a wheel hub and a wheel bearing provided with the same {Hub bolt for mounting wheel to wheel hub and wheel bearing provided therewith}

The present invention relates to a hub bolt used to mount a wheel to the wheel hub of a wheel bearing and a wheel bearing having the same. More specifically, the present invention relates to a hub bolt used to mount a wheel to the wheel hub of a wheel bearing, and more specifically, to a hub bolt that is designed to form a protrusion on the hub bolt and press-fit it between the protrusion and the hub flange. This relates to a hub bolt configured to prevent unexpected slip from occurring and a wheel bearing provided therewith.

A bearing is a device that supports a rotating element in a rotating device by rotatably mounting it on a non-rotating element, and a wheel bearing is used to support a vehicle's wheel by rotatably mounting it on the vehicle body.

Referring to Figure 1, the structure of a wheel bearing used in the related art is shown as an example. As shown in FIG. 1, the wheel bearing is connected to the rotating element 10 (wheel hub) on which the wheel of the vehicle is mounted to the non-rotating element 20 (outer wheel) fixed to the vehicle body through the rolling element 30. It is configured to support the wheel connected to the rotation element 10 (wheel hub) by mounting it in a rotatable state with respect to the vehicle body, and the wheel hub 10 on which the wheel is mounted has a hub flange extending radially outward on one side ( 12) is provided and configured to mount the wheel to the wheel hub 10 by inserting the hub bolt 40 into the bolt mounting hole 14 formed in the hub flange 12.

On the other hand, the hub bolt 40 used to attach the wheel to the wheel hub 10 has a head portion 42 provided at one end, and is disposed at a position axially spaced apart from the head portion 42 to form a hub flange ( It may be composed of a coupling portion 44 that is inserted and coupled into the bolt mounting hole 14 formed in 12) and an extension portion 46 extending axially from the coupling portion 44. A serration extending along the axial direction is formed on the outer peripheral surface, and the serration is configured to be installed by being press-fitted into the bolt mounting hole.

However, because a large torque is generally applied to the wheels of a vehicle, unintentional slip may occur between the wheels and the wheel hub, which causes rotational force to be applied to the hub bolts connecting the wheel hub and the hub. There are cases where wear occurs at the part where the bolt is inserted, causing damage to the serration joint and causing problems such as making it impossible to separate the wheel connected to the wheel hub.

As a way to prevent this problem, referring to Patent Document 1, a polygonal coupling structure is formed in the hub bolt 40 and the bolt mounting hole 14 of the hub flange 12 into which the hub bolt is inserted and mounted, thereby forming a hub bolt ( 40) A technology to prevent the slip problem has been proposed.

Specifically, the hub bolt 40 and wheel bearing 10 disclosed in Patent Document 1 are fastened in a polygonal shape between the head portion 42 and the coupling portion 44 of the hub bolt 40, as shown in FIG. A portion 48 is formed and a corresponding polygon-shaped recess 16 is formed in the bolt mounting hole 14 of the hub flange 12 into which the hub bolt 40 is inserted, thereby forming a polygon-shaped coupling structure [polygonal]. It is configured to prevent unintentional rotation of the hub bolt through the shaped fastening portion 48 and the recess 16.

However, the anti-slip structure formed in this way requires forming a polygonal coupling structure on both sides of the hub bolt 40 and the hub flange 12 of the wheel hub, which reduces the productivity of the hub bolt and wheel hub, and this polygonal shape Even if a coupling structure of There are problems that cannot be completely prevented.

Korea Patent Publication No. 10-2018-0061898 (Publication date: 2018.06.08.)

The present invention is intended to solve the above-described conventional problems, by forming a protrusion protruding radially outward on the hub bolt mounted on the hub flange of the wheel hub so that the protrusion is press-fitted and mounted on the hub flange when the hub bolt is coupled. The purpose is to provide a hub bolt configured to prevent unexpected slip from occurring and a wheel bearing provided therewith.

A representative configuration of the present invention to achieve the above-described object is as follows.

According to one embodiment of the present invention, a hub bolt used to mount a wheel to a wheel hub of a wheel bearing is provided. The hub bolt according to an embodiment of the present invention includes a head portion formed on one side, a coupling portion disposed axially spaced from the head portion and having serrations formed on the outer peripheral surface, and an extension formed to extend axially from the coupling portion. It may include a protrusion formed to protrude in the radial direction from the outer peripheral surface between the portion and the serrations of the coupling portion and the head portion.

According to one embodiment of the present invention, the protrusion may be configured to be press-fitted to the hub flange when mounting the hub bolt by inserting it into the bolt mounting hole formed in the hub flange.

According to one embodiment of the present invention, when the protrusion is press-fitted and mounted on the hub flange, one or both of the protrusion and the hub flange may be configured to be elastically deformed and coupled.

According to one embodiment of the present invention, a plurality of protrusions may be arranged to be spaced apart from each other along the circumferential direction of the hub bolt.

According to one embodiment of the present invention, three or more protrusions may be arranged to be spaced apart from each other along the circumferential direction of the hub bolt.

According to one embodiment of the present invention, the protrusion may be configured to protrude further outward in the radial direction as it moves from the coupling portion toward the head portion.

According to one embodiment of the present invention, the radially outer portion of the protrusion may be formed in an inclined structure that protrudes more radially outward from the coupling portion toward the head portion.

According to one embodiment of the present invention, the bolt mounting hole formed in the wheel hub has a chamfer with an inclined structure at the end in the direction in which the hub bolt is inserted, and the inclined structure formed on the radial outer side of the protrusion has a bolt mounting hole. The angle formed with the central axis may be smaller than the angle formed by the chamfer formed in the bolt mounting hole and the central axis of the bolt mounting hole.

According to one embodiment of the present invention, the protrusion may be formed in a shape where the width becomes narrower as it goes from the head toward the coupling portion and as it goes radially outward from the outer peripheral surface of the hub bolt.

According to one embodiment of the present invention, a wheel bearing is provided to support a wheel of a vehicle by rotatably mounting it on a vehicle body. A wheel bearing according to an embodiment of the present invention includes a wheel hub having a hub flange for mounting a wheel, one or more inner rings that are press-fitted and mounted on one side of the wheel hub, and a radial outer side of the inner ring that is mounted on the outer peripheral surface of the vehicle body. It may be configured to include an outer ring having a mounting flange mounted on the outer ring, one or more rolling elements mounted on the radial inner side of the outer ring, and the hub bolt described above.

In addition to this, the hub bolt according to the present invention and the wheel bearing provided with the same may further include other additional configurations without impairing the technical spirit of the present invention.

The hub bolt according to an embodiment of the present invention has a protrusion protruding outward in the radial direction between the serrations of the coupling portion and the head portion, so that when the hub bolt is inserted and mounted into the bolt mounting hole of the hub flange, the strength of the coupling portion is increased. The ration is installed by being press-fitted into the inner peripheral surface of the bolt mounting hole of the hub flange, and the protrusion can be installed by being press-fitted into one side of the hub flange, improving the fixing power of the hub bolt and preventing unintentional damage to the hub bolt even if the serration of the hub bolt is deformed. It is possible to prevent slip from occurring.

Figure 1 exemplarily shows the structure of a conventional wheel bearing.
Figure 2 exemplarily shows the structure of a hub bolt used to attach a wheel to a wheel hub in a conventional wheel bearing.
Figure 3 exemplarily shows the structure of a wheel bearing according to an embodiment of the present invention.
4 and 5 exemplarily show the structure of a hub bolt that can be used in a wheel bearing according to an embodiment of the present invention.
Figure 6 exemplarily shows a hub bolt mounted on the hub flange of a wheel bearing 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 so that a person skilled in the art can easily implement the present invention.

In order to clearly explain the present invention, detailed descriptions of parts unrelated to the present invention will be omitted, and like elements will be described with the same reference numerals throughout the specification. In addition, the shape and size of each component shown in the drawings are arbitrarily drawn for convenience of explanation, and the present invention is not necessarily limited to the shape and size shown. That is, the specific shape, structure, and characteristics described in the specification may be modified and implemented from one embodiment to another without departing from the spirit and scope of the present invention, and the location or arrangement of individual components may also be implemented within the spirit and scope of the present invention. It should be understood that changes can be made without departing from the scope. Accordingly, the detailed description described below is not intended to be limited, and the scope of the present invention should be taken to encompass the scope claimed by the claims and all equivalents thereof.

Preferred Embodiments of the Invention

3 to 6, a wheel bearing 100 for a vehicle according to an embodiment of the present invention and a hub bolt 200 used to mount a wheel of a vehicle to the wheel bearing 100 for a vehicle are shown as examples. It is done.

As shown in the drawing, the wheel bearing 100 according to an embodiment of the present invention may be formed similarly to a typical wheel bearing for a vehicle. For example, as shown in FIG. 3, the wheel bearing 100 according to an embodiment of the present invention includes a wheel hub 110 (rotating element), an inner ring 120, an outer ring 130 (non-rotating element), and a rolling element 140. ) and the like.

According to one embodiment of the present invention, the wheel hub 110 may be formed into a substantially cylindrical structure extending along the axial direction, and a hub flange 112 is provided near the wheel side end of the wheel hub 110. It can be. The hub flange 112 is formed in a shape that extends radially outward along the circumferential direction of the wheel hub 110, and can be used to mount the wheel to the wheel hub 110 using hub bolts 200, which will be described later. . Meanwhile, a step may be formed at the end of the vehicle body side of the wheel hub 110 to mount the inner ring 120, and a raceway surface (inner raceway surface) may be formed on a portion of the outer circumferential surface of the wheel hub 110 so that the rolling element ( 140) may be configured to support it from the inside. However, in the case of the embodiment shown in the drawing, one raceway surface for supporting the rolling element is formed directly on a portion of the outer peripheral surface of the wheel hub. However, unlike this, two inner rings are mounted on the wheel hub, and the rolling element is formed through the two inner rings. It may be configured to form a track surface (inner track surface) of the fuselage.

The inner ring 120 may be configured to be press-fitted and mounted on one side of the wheel hub 110. For example, the inner ring 120 is press-fitted into a step formed at the end of the vehicle body side of the wheel hub 110, and the end of the wheel hub 110 is plastically deformed as shown in FIG. It may be configured to be seated and maintained on the wheel hub 110 by fastening a nut, etc. to the end of the vehicle body. In addition, the outer peripheral surface of the inner ring 120 may be provided with a raceway surface (inner raceway surface) that the rolling element 140 contacts, so as to support the rolling element from the inside.

The outer ring 130 may be configured to have a mounting flange on its outer circumferential surface for mounting the wheel bearing 100 to the vehicle body, and a raceway surface (outer raceway surface) with which the rolling element 140 contacts its inner circumferential surface. The raceway (outer raceway) formed on the inner peripheral surface of the outer ring 130 cooperates with the raceway (inner raceway) formed on the wheel hub 110 and/or the inner ring 120, and the rolling element (rolling element) between the raceway surfaces 140) can be configured to accommodate and support.

The rolling element 140 is located on the radial inner side of the outer ring 130, specifically, the raceway surface (outer raceway surface) formed on the outer ring 130 and the raceway surface (inner raceway) formed on the wheel hub 110 and/or the inner ring 120. It is disposed between the raceways) and can perform the function of rotatably supporting the wheel hub 110 on which the wheel is mounted with respect to the outer wheel 130 fixed to the vehicle body.

Meanwhile, according to one embodiment of the present invention, the hub flange 112 of the wheel hub 110 is provided with a bolt mounting hole 114, and the hub bolt 200 is inserted into the bolt mounting hole 114 to install the wheel hub ( It may be configured to mount and fasten the wheel (and brake disc) to the hub flange 112 of 110).

According to one embodiment of the present invention, the bolt mounting hole 114 may be formed in a direction parallel to the axial direction of the wheel hub 110 and penetrate the hub flange 112, and the bolt mounting hole 114 ) One or both ends may be rounded or have chamfers formed for stable insertion and installation of the hub bolt 200. For example, the bolt mounting hole 114 may be configured to have a chamfer 116 having an inclined structure at an end in the direction in which the hub bolt 200 is inserted, as shown in FIGS. 3 and 6 .

According to one embodiment of the present invention, the hub bolt 200 may be inserted and mounted in the bolt mounting hole 114 formed in the hub flange 112 of the wheel hub 110. In this regard, referring to FIGS. 4 and 5 , the structure of the hub bolt 200 according to an embodiment of the present invention is shown as an example.

According to one embodiment of the present invention, the hub bolt 200 may be formed to have an overall structure similar to a typical hub bolt used in a vehicle wheel bearing. For example, according to one embodiment of the present invention, the hub bolt 200 has a head portion 210 provided on one side, is arranged to be spaced apart from the head portion 210 in the axial direction (longitudinal direction), and has a hub flange 112. ) may include a coupling portion 220 that is inserted and coupled to the bolt mounting hole 114 formed in the coupling portion 220, and an extension portion 230 extending along the axial direction of the hub bolt from the coupling portion 220.

The head portion 210 is formed at one end of the hub bolt and contacts one end surface of the hub flange 112 when mounting the hub bolt 200 to the bolt mounting hole 114 of the hub flange 112, thereby contacting the hub bolt ( 200) can perform the function of limiting the movement. To this end, the head portion 210 of the hub bolt 200 may be formed in a structure having a larger cross-section than the bolt mounting hole 114 of the hub flange 112 into which the hub bolt 200 is inserted.

The coupling portion 220 is provided at a position spaced apart from the head portion 210 along the longitudinal direction of the hub bolt and may be configured to have serrations extending along the longitudinal direction on the outer peripheral surface. Specifically, the coupling portion 220 is configured such that the longitudinal serrations 222 formed on the outer peripheral surface are press-fitted and mounted on the inner peripheral surface of the bolt mounting hole 114 of the hub flange 112, thereby attaching the hub bolt 200 to the hub flange ( 112) can be installed and maintained.

The extension portion 230 is configured to extend from the coupling portion 220 along the longitudinal direction of the hub bolt and may be configured to protrude from the hub flange 112 when the hub bolt 200 is mounted on the hub flange 112. . According to one embodiment of the present invention, a threaded portion is formed on the outer peripheral surface of the extension portion 230 to fasten the wheel and/or brake disc mounted on the hub flange 112 to the wheel hub 110 using a coupling member such as a nut. It can be configured to do so.

According to one embodiment of the present invention, between the serrations 222 formed in the coupling portion 220 of the hub bolt 200 and the head portion 210, a protrusion ( 240) may be provided. [In this specification, the description that the protrusion 240 is formed between the serrations 222 and the head portion 210 of the coupling portion 220 means that the serrations 222 and the head portion 210 of the coupling portion 220 ), which means that the protrusion 240 is provided in the space between the serrations 222 and the head portion 210 of the coupling portion 220. In addition, it also includes a configuration in which a protrusion 240 is formed in a portion of the axial gap between the serrations 222 and the head portion 210 of the coupling portion 220, and as shown in FIG. 3, the coupling portion 220 [Includes all configurations formed by extending the protrusion 240 to the serration 222]

According to one embodiment of the present invention, this protrusion 240 is press-fitted into one side of the hub flange 112 when inserting the hub bolt 200 into the bolt mounting hole 114 of the hub flange 112 ( 200) can perform the function of fixing. For example, according to one embodiment of the present invention, the protrusion 240 formed on the hub bolt 200 is press-fitted into the hub flange 112 and when mounted, the protrusion 240 of the hub bolt 200 and the hub flange 112 ) may be configured to be press-fitted while either or both of the press-fit portions are elastically deformed.

According to one embodiment of the present invention, the protrusion 240 may be formed in a shape whose width becomes narrower as it moves from the head portion 210 toward the coupling portion 220 and radially outward from the outer peripheral surface of the hub bolt. According to this structure, due to the shape of the protrusion 240 whose width becomes narrower toward the end, when the hub bolt 200 is inserted and mounted into the bolt mounting hole 114 of the hub flange 112, the protrusion 240 is It can be more easily press-fitted and fixed to the hub flange.

According to one embodiment of the present invention, one or more protrusions 240 formed on the hub bolt may be formed along the circumferential direction of the hub bolt. However, in order to improve the fastening force of the hub bolt by the protrusion 240, the hub bolt 200 according to an embodiment of the present invention has a plurality of protrusions (preferably three or more) along the circumferential direction. It may be desirable to be configured to be spaced apart.

According to one embodiment of the present invention, the protrusion 240 formed on the hub bolt 200 moves radially outward from the outer peripheral surface as it moves from the serration 222 of the coupling portion 220 toward the head portion 210. It may be formed to protrude further. In this way, if the protrusion 240 is formed in a structure that becomes higher as it moves toward the head portion 210, when the hub bolt 200 is fastened to the bolt mounting hole 114 of the hub flange 112, the protrusion initially has a small area. Only 240 is press-fitted, and as the hub bolt 200 is fastened, the protrusion 240 of a larger area is press-fitted, making it easier to press-fit the protrusion 240.

According to one embodiment of the present invention, the protrusion 240 formed on the hub bolt 200 has a radius of the protrusion 240 as it moves from the serration 222 of the coupling portion 220 toward the head portion 210. The direction outer portion 242 may be configured to be formed in an inclined structure having a predetermined angle α with respect to the longitudinal direction of the hub bolt 200 (that is, with respect to the central axis of the bolt mounting hole 114).

According to one embodiment of the present invention, the angle α formed by the inclined structure formed by the radial outer portion 242 of the protrusion 240 with the central axis of the bolt mounting hole 114 is the bolt of the hub flange 112. So that the angle is gentler than the chamfer 116 formed at the end of the mounting hole 114 (i.e., the angle (α) formed by the radial outer portion 242 of the protrusion 240 with the central axis of the bolt mounting hole 114) It may be configured so that the temporary chamfer 116 is formed smaller than the angle (β) formed with the central axis of the bolt mounting hole 114.

According to this structure, when the hub bolt 200 is inserted into the bolt mounting hole 114 of the hub flange 112, the hub flange is sequentially pressed starting from the end of the protrusion 240 located in the insertion direction of the hub bolt 200. This allows the hub bolt 200 to be more easily press-fitted and installed into the bolt mounting hole 114 of the hub flange 212.

Although the present invention has been described above with reference to specific details such as specific components and limited examples, these examples are provided only to facilitate a more general understanding of the present invention, and the present invention is not limited thereto. Anyone with ordinary knowledge in the relevant technical field can make various modifications and variations from this description.

Therefore, the spirit of the present invention should not be limited to the above-described embodiments, and all modifications equivalent or equivalent to the claims as well as the following claims fall within the scope of the spirit of the present invention. something to do.

100: wheel bearing
110: wheel hub
112: hub flange
114: bolt installer
116: Chamfer (at the end of the bolt mounting hole)
120: inner ring
130: paddle
140: rolling element
200: hub bolt
210: head part
220: coupling part
222: serration
230: extension part
240: protrusion
242: Radial outer portion of the protrusion

Claims (9)

It is a hub bolt (200) used to attach a wheel to the wheel hub (110) of the wheel bearing (100),
A head portion 210 formed on one side,
A coupling portion 220 arranged to be axially spaced from the head portion 210 and having serrations 222 formed on the outer peripheral surface,
An extension portion 230 extending in the axial direction from the coupling portion 220,
It includes a protrusion 240 that protrudes radially from the outer peripheral surface between the serrations 222 of the coupling portion 220 and the head portion 210,
The protrusion 240 is formed in a shape whose width becomes narrower as it moves from the head portion 210 toward the coupling portion 220 and radially outward from the outer peripheral surface of the hub bolt 200.
hub bolt.
It is a hub bolt (200) used to attach a wheel to the wheel hub (110) of the wheel bearing (100),
A head portion 210 formed on one side,
A coupling portion 220 arranged to be axially spaced from the head portion 210 and having serrations 222 formed on the outer peripheral surface,
An extension portion 230 extending in the axial direction from the coupling portion 220,
It includes a protrusion 240 that protrudes radially from the outer peripheral surface between the serrations 222 of the coupling portion 220 and the head portion 210,
The protrusion 240 is formed in a shape whose width becomes narrower as it moves from the head portion 210 toward the coupling portion 220 and radially outward from the outer peripheral surface of the hub bolt 200,
By making the height at which the protrusion 240 protrudes from the surface of the hub bolt 200 become higher as it moves from the serration 222 of the coupling portion 220 toward the head portion 210, the protrusion 240 Formed to protrude further outward in the radial direction from the coupling portion 220 toward the head portion 210,
hub bolt.
According to claim 1 or 2,
The protrusion 240 is configured to be press-fitted and mounted on the hub flange 112 when the hub bolt 200 is inserted into the bolt mounting hole 114 formed in the hub flange 112.
hub bolt.
According to paragraph 3,
When the protrusion 240 is press-fitted and mounted on the hub flange 112, at least one of the protrusion 240 and the hub flange 112 is configured to be elastically deformed and coupled.
hub bolt.
According to paragraph 3,
A plurality of the protrusions 240 are arranged to be spaced apart from each other along the circumferential direction of the hub bolt 200.
hub bolt.
According to clause 5,
The protrusions 240 are arranged in three or more numbers spaced apart from each other along the circumferential direction of the hub bolt 200.
hub bolt. According to paragraph 2,
The radially outer portion 242 of the protrusion 240 is formed in an inclined structure that protrudes more radially outward from the coupling portion 220 toward the head portion 210.
hub bolt. In clause 7,
The bolt mounting hole 114 formed in the wheel hub 110 has a chamfer 116 with an inclined structure at the end in the direction in which the hub bolt 200 is inserted,
The angle (α) formed by the inclined structure formed on the radial outer side 242 of the protrusion 240 with the central axis of the bolt mounting hole 114 is such that the chamfer 116 formed in the bolt mounting hole 114 is Formed to be smaller than the angle (β) formed with the central axis of the bolt mounting hole 114,
hub bolt. It is a wheel bearing (100) that supports the wheel of a vehicle by rotatably mounting it on the vehicle body,
A wheel hub 110 having a hub flange 112 for mounting a wheel,
One or more inner rings 120 press-fitted and mounted on one side of the wheel hub 110,
An outer ring (130) mounted on a radial outer side of the inner ring (120) and having a mounting flange (132) mounted on the outer circumferential surface of the vehicle body;
One or more rolling elements 140 mounted on the radial inner side of the outer ring 130,
Comprising a hub bolt 200 according to claim 1 or 2,
Wheel bearings.

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