KR101004998B1 - Device and method for manufacturing wheel bearing device - Google Patents

Abstract

The present invention relates to a manufacturing apparatus and a manufacturing method of a wheel bearing assembly that can reduce the failure rate of the wheel bearing assembly by reducing the stress concentrated on the rolling element in the manufacturing process of the wheel bearing assembly.

The manufacturing apparatus of the wheel bearing assembly, the base is installed on the upper surface of the hub for supporting the hub during orbital forming; A molding tool mounting portion mounted on an upper portion of the base; A rotation part rotatably supporting the outer ring to rotate the outer ring about a hub axis during orbital forming; And a molding tool mounted to the molding tool mounting part and rotating about a first axis inclined by a predetermined angle with respect to the hub axis, and simultaneously revolving about a second axis parallel to the hub axis. At least one of the forming tool mount and the base may be adapted to move toward the other such that the forming tool orbitally forms the distal end of the hub outwards inwardly towards the inner ring.

Wheel bearing, orbital forming

Description

Manufacturing apparatus and manufacturing method of wheel bearing assembly {DEVICE AND METHOD FOR MANUFACTURING WHEEL BEARING DEVICE}

The present invention relates to a manufacturing apparatus and a manufacturing method of a wheel bearing assembly, and more particularly, to manufacture a wheel bearing assembly that can reduce the failure rate of the wheel bearing assembly by reducing the stress concentrated on the rolling element in the manufacturing process of the wheel bearing assembly It relates to an apparatus and a manufacturing method.

In general, wheel bearings allow the assembly to move by rotatably connecting the wheel to the vehicle body. Such a wheel bearing assembly is roughly divided into a drive wheel wheel bearing assembly that transmits power generated in an engine and a driven wheel wheel bearing that does not transmit drive force.

The drive wheel wheel bearing assembly includes a rotating element that is connected to rotate with the drive wheel shaft that is generated by the engine and rotates by the torque passing through the transmission, and a non-rotating element fixed to the vehicle body, between the rotating element and the non-rotating element. The rolling element is interposed. The driven wheel wheel bearing assembly does not have a rotating element connected to the drive wheel shaft but the other configuration is the same as the drive wheel wheel bearing assembly.

The wheel bearing assembly is manufactured such that a preload is generated in the rolling element for the stability of the operating performance, and a method mainly used for preloading the rolling element is orbital forming.

A brief look at a conventional orbital forming method is as follows.

First, a first row of rolling elements is inserted into a rotating element of the wheel bearing assembly (herein, 'hub'), and then the outer ring is mounted so that the first inner and outer ring raceways and the first rolling elements come into contact with each other. Thereafter, after inserting the rolling elements in the second row into the second outer ring raceway, the inner ring on which the second inner ring track is formed is press-fitted. At this time, the distal end of the hub protrudes outward in the axial direction of the inner ring.

Position the wheel bearing assembly in the above state so that the distal end of the hub is upwards and fix it to the base so that the hub and the outer ring do not move.

The tip of the hub is then pressed against the hub axis (meaning the central axis of the wheel bearing assembly) at an angle relative to the hub axis and pressed from the top to the bottom of the hub with a forming tool that rotates about the hub axis. Bend outward radially towards the inner ring and plastically deform. At this time, the inner ring is preloaded with the rolling element and fixed in the axial direction.

However, according to the conventional orbital forming method, the speed difference between the molding tool and the hub is large, and a large impact is applied to the distal end of the hub when the molding tool contacts the hub. In particular, the distal end portion of the hub is thinner than other portions of the hub has a problem that can be damaged by such a large impact.

In addition, a stress concentration phenomenon occurs in the rolling element due to an impact applied to the hub by the forming tool. In the conventional orbital forming method, the outer ring is fixed, and thus, the stress concentration phenomenon cannot be alleviated.

This stress concentration phenomenon contributes to an increase in the failure rate of the wheel bearing assembly.

Therefore, the present invention was created to solve the above problems, an object of the present invention is to reduce the stress concentrated on the rolling element in the manufacturing process of the wheel bearing assembly wheel bearing that can lower the failure rate of the wheel bearing assembly It is to provide a manufacturing apparatus and a manufacturing method of the assembly.

In addition, another object of the present invention is to provide a manufacturing apparatus and a manufacturing method of a wheel bearing assembly that can reduce the impact exerted during the manufacturing process by having a hub at the initial orbital forming in accordance with the rotation of the molding tool.

The manufacturing apparatus of the wheel bearing assembly according to the embodiment of the present invention for achieving this object is a hub having one end coupled to the wheel of the vehicle and the other end has a stepped portion and the end portion, the inner ring mounted on the stepped portion of the hub, the vehicle body In a wheel bearing assembly comprising an outer ring to be mounted and a rolling element interposed between the outer ring and the hub and the inner ring, the distal end of the hub is orbital formed radially outward toward the inner ring.

The manufacturing apparatus of the wheel bearing assembly, the base is installed on the upper surface of the hub for supporting the hub during orbital forming; A molding tool mounting portion mounted on an upper portion of the base; Rotating part for rotatably supporting the outer ring to rotate the outer ring to the hub axis during orbital forming; And a molding tool mounted to the molding tool mounting part and rotating about a first axis inclined by a predetermined angle with respect to the hub axis, and simultaneously revolving about a second axis parallel to the hub axis. At least one of the forming tool mount and the base may be adapted to move toward the other such that the forming tool orbitally forms the distal end of the hub outwards inwardly towards the inner ring.

The forming tool is cylindrical and the central axis of the forming tool may coincide with the first axis.

A molding groove may be formed at a lower end of the molding tool in contact with the distal end of the hub to orbital the distal end of the hub toward the inner ring in a radially outward direction.

One side of the hub includes a flange protruding radially outward and a bolt hole drilled in the flange to couple the wheel and the hub of the vehicle, and the base has a guiding groove formed at a position corresponding to the bolt hole. A guiding pin may be inserted into the bolt hole and the guiding groove to guide the hub to have a set movement to reduce stress concentrated on the rolling element during orbital forming.

The set movement of the hub may be generated by the rotational movement of the guiding pin in the bolt hole.

The set movement of the hub may be a vertical reciprocating motion of the hub within a predetermined range.

When the hub is vertically reciprocating, the molding tool may also be vertically reciprocating in contact with the hub.

According to another embodiment of the present invention, a method of manufacturing a wheel bearing assembly includes a hub having one end coupled to a wheel of a vehicle and the other end having a stepped portion and an end portion formed therein, an inner ring mounted on the stepped portion of the hub, an outer ring mounted on the vehicle body, and In a wheel bearing assembly comprising a rolling element interposed between the outer ring and the hub and the inner ring, a forming tool rotates and contacts the distal end of the hub to orbital form the distal end of the hub outwardly toward the inner ring.

The manufacturing method of the wheel bearing assembly may be such that at least one of the forming tool and the hub moves toward the other such that the forming tool contacts the distal end of the hub, and the outer ring rotates about the hub axis during orbital forming, The forming tool rotates about a first axis inclined by a set angle with respect to the hub axis, simultaneously revolves about a second axis parallel to the hub axis and orbitally forms the distal end of the hub outward toward the inner ring. Can be.

The hub may be guided to have a set movement to reduce the stress concentrated on the rolling element during orbital forming.

The rotational speed of the outer ring may be slower than the rotating and idle speed of the forming tool.

As described above, according to the manufacturing apparatus and manufacturing method of the wheel bearing assembly according to the present invention, since the outer ring rotates to alleviate the stress concentrated on the rolling element, the failure rate of the wheel bearing assembly can be lowered.

In addition, since the hub has a set movement at the beginning of orbital forming as the molding tool rotates, the impact applied when the molding tool contacts the distal end of the hub can be reduced, thereby preventing breakage of the distal end of the hub.

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

1 is a cross-sectional view showing the structure of a general wheel bearing assembly.

The wheel bearing assembly illustrated in FIG. 1 illustrates one of various types of wheel bearing assemblies for convenience of description, and the present invention is not limited to the illustrated wheel bearing assembly and is not applicable to various types of wheel bearing assemblies. Can be applied. In particular, it is obvious that it can be applied to any of the wheel bearing assemblies that comprise a rotating element and a non-rotating element, which are fabricated by orbital forming the distal end of one element toward the other.

In addition, the wheel bearing assembly shown in FIG. 1 illustrates a driven wheel wheel bearing assembly. However, since the driving wheel wheel bearing assembly is formed by the inner side of the hub and spline-coupled with the drive shaft is also manufactured by the same method as the driven wheel wheel bearing assembly, the technical spirit of the present invention is not limited to the driven wheel wheel bearing assembly, the driving wheel wheel bearing assembly It is also obvious that it can be applied to.

As shown in FIG. 1, an exemplary wheel bearing assembly 100 includes a hub 110, an inner ring 120, an outer ring 130, and a rolling element 150. Although a roller-type rolling element is shown here, a tapered rolling element may be used, and the number of rows of the rolling element may be arbitrarily determined by those skilled in the art.

The hub 110 has a cylindrical shape, and a wheel (not shown) of the vehicle is coupled to one end of the hub 110. To this end, one end of the hub 110 protrudes radially outward to form the first flange 112 and protrude in the direction of the hub axis X1 to form the pilot 116. A first bolt hole 114 is drilled in the flange 112 so that the wheel of the vehicle can be coupled to the hub 110 by a coupling means such as a bolt, and the pilot 116 attaches the wheel to the hub 110. It serves as a guide for the wheels when mounted. In addition, the step portion 118 is formed on the other side of the hub 110, and the distal end portion 160 extends to the step portion 118. The distal end portion 160 extends straight in the direction of the hub axis X1 before orbital forming, but is bent in a radially outward direction to be plastically deformed after orbital forming. A first inner raceway 119a is formed between the stepped portion 118 of the hub 110 and the first flange 112.

The inner ring 120 is pressed into the stepped portion of the hub 110, and the inner ring 120 has a second inner ring raceway 119b.

Outer ring 130 is mounted to the outside of the radius of the hub (110). The first and second outer ring raceways 139a and 139b corresponding to the first and second inner ring tracks 119a and 119b are formed on the radially inner surface of the outer ring 130, and a portion of the outer surface of the outer ring protrudes radially outward. To form a second flange 132. A second bolt hole 134 is drilled in the second flange 132 so that the outer ring 130 is coupled to the vehicle body by a coupling means such as a bolt.

The rolling element 150 is interposed between the first inner raceway 119a and the first outer raceway 139a and between the second inner raceway 119b and the second outer raceway 139b, respectively.

In addition, between the hub 110 and the outer ring 130, and between the inner ring 120 and the outer ring 130, the sealing member 140, in order to prevent foreign matter such as dust or moisture from entering the rolling element 150 142 may be mounted respectively.

2 is a schematic view showing an apparatus for manufacturing a wheel bearing assembly according to an embodiment of the present invention.

As shown in FIG. 2, the apparatus for manufacturing a wheel bearing assembly according to an exemplary embodiment of the present invention includes a base 400, a molding tool mounting part 310, a rotating part 500, a molding tool 200, and a support part 300. It includes.

The base 400 is disposed on the lowermost layer of the wheel bearing assembly, and the wheel bearing assembly 100 is positioned on an upper surface thereof. In this case, a pilot insertion groove 420 is formed in the base 400 so that the pilot 116 protruding in the direction of the hub axis X1 is inserted when the wheel bearing assembly 100 is mounted. In addition, a guiding groove 410 is formed at a position corresponding to the first bolt hole 114 to the side of the pilot insertion groove 420 so that the first bolt when the hub 110 is mounted to the base 400. The guiding pin 410 is inserted into the ball 114 and the guiding groove 410 so that the hub 110 is supported on the base 400. A predetermined gap is formed between the guiding pins 410 and the guiding grooves 410 so that the hub 110 can move back, forth, left, and right.

A molding tool mount 310 is mounted on top of the base 310.

At least one of the base 400 and the molding tool mounting part 310 may be connected to a moving means such as a cylinder (not shown) to move up and down toward each other. Here, the case where the molding tool mounting part 310 is connected to a cylinder and can move up and down is demonstrated. The molding tool mounting unit 310 is rotatably mounted to the molding tool mounting unit 310 about the first shaft Y1 inclined by a predetermined angle with respect to the hub axis X1. In addition, the forming tool mounting portion 310 is positioned such that its central axis coincides with a second axis Y2 parallel to the hub axis X1, particularly preferably in a straight line with the hub axis X1.

The rotary part 500 is adapted to fix the outer ring 130 of the wheel bearing assembly 100. In addition, the rotation unit 500 is connected to the connector 600, the connector 600 is connected to a motor (not shown) for generating a rotational force and the like to transmit the rotational force to the rotation unit 500. Therefore, during orbital forming, the rotating unit 500 rotates the outer ring 130 in a direction set around the hub axis X1. The set direction may be the same direction or the opposite direction to the revolving direction of the molding tool according to the intention of the designer, the rotation in the same direction and the opposite direction can be repeated with a set period.

The molding tool 200 has a cylindrical shape, and is rotatably mounted at an angle set to the molding tool mounting part 310, and an end portion 160 of the hub 110 is inserted at a lower end thereof so that the inner ring during orbital forming is formed. The forming groove 210 is formed to be formed radially outward toward the 120. The molding tool 200 is subjected to two rotational motions of rotation and revolution. Here, the rotation means the rotation about the first axis (Y1), which is the centerline of the molding tool 200, and the revolution means the second center around the point where the second axis (Y2) and the first axis (Y1) meets. It means to rotate around the axis Y2. The top and bottom of the molding tool 200 by the revolving is to have a circular motion having a set radius. The reason for rotating and revolving the molding tool 200 as described above is to reduce the impact by reducing the relative rotational speed at the contact of the molding tool 200 and the distal end 160 of the hub 110.

In addition, the molding tool 200 may move up and down within a predetermined range.

The support 300 is mounted to the lower portion of the molding tool mounting portion 310 to surround the molding tool 200. The support part 300 is located on the upper surface of the rotating part 500 during orbital forming and prevents the separation of the wheel bearing assembly 100 and at the same time prevents heat and noise generated during orbital forming from spreading around.

Hereinafter, a process of manufacturing the wheel bearing assembly using the manufacturing device of the wheel bearing assembly will be described.

First, the wheel bearing assembly 100 is positioned on the upper surface of the base 400 so that the pilot 116 of the wheel bearing assembly 100 is inserted into the pilot insertion groove 420, and then the first bolt hole 114 is guided. Align the groove 410 and insert the guiding pin 115. In addition, the outer ring 130 and the second flange 132 are in close contact with the inner circumferential surface of the rotating part 300 to mount the wheel bearing assembly 100 to the base 400.

Thereafter, the rotating part 300 rotates the outer ring 130, and the molding tool 200 rotates about the first axis Y1 and revolves about the second axis Y2. In this state, the forming tool mount 310 is lowered toward the wheel bearing assembly 100.

Finally, the distal end 160 of the hub 110 is inserted into and contacted with the forming groove 210 of the molding tool 200, and the distal end 160 of the hub 100 is molded radially outward toward the inner ring 120. It will be in close contact with one end of the inner ring (120).

At this time, since the molding tool 200 rotates and revolves, the difference in rotational speed is reduced when the molding tool 200 is in contact with the distal end 160, thereby reducing the impact applied to the distal end 160.

In addition, since a predetermined gap is formed between the guiding pin 410 and the guiding groove 410, the guiding pin 410 is in the guiding groove 410 as the molding tool 200 rotates. At a constant rotation or swing up and down, thereby the hub 110 has a set movement. The set movement of the hub 110 reduces the stress concentrated on the rolling element 150 during orbital forming and reduces the impact applied when the forming tool 200 contacts the distal end 160 of the hub 110. When the hub 110 swings up and down, the molding tool 200 may also reciprocate up and down in contact with the hub 110.

Furthermore, since the outer ring 130 is rotated by the rotary unit 500, the wheel bearing assembly () is relieved of stress concentrated on the rolling element from the forming tool 200 through the hub 110 and the inner ring 120. The failure rate of 100) is lowered.

On the other hand, the rotational speed of the outer ring 130 is preferably slower than the rotating speed and the rotating speed of the molding tool 200.

In addition, at the beginning when the distal end 160 of the hub 110 contacts the molding groove 210 of the molding tool 200 and becomes orbital forming, as described above, the hub 110 moves back, forth, left, right, up and down. You can swing. In this case, the hub 110 is not separated from the base 400 by the guiding pin 115 and the support part 300 inserted into the guiding groove 410. In this state, as the forming tool 200 is further lowered and orbital forming is completed, the movement of the hub 110 is reduced by the pressing force of the forming tool 200 and the wheel bearing assembly 100 is completed.

Meanwhile, instead of using the guiding pin 115, the hub 110 is fixed to the base 400 using a hub fixing bolt (not shown), and the wheel bearing assembly is rotated only by rotating the outer ring 130 during orbital forming. You can also make.

When the wheel bearing assembly 100 is completed by the above process, the forming tool mounting unit 310 moves upwards and separates the outer ring 130 from the rotating unit 500 and then takes out the wheel bearing assembly 100. Done.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and can be easily changed by those skilled in the art from the embodiments of the present invention. Includes all changes that are considered to be equivalent.

1 is a cross-sectional view showing the structure of a general wheel bearing assembly.

2 is a schematic view showing an apparatus for manufacturing a wheel bearing assembly according to an embodiment of the present invention.

Claims (10)

One end is coupled to the wheel of the vehicle, and the other end includes a hub having a stepped portion and a distal end portion, an inner ring mounted on the stepped portion of the hub, an outer ring mounted on the vehicle body, and a rolling element interposed between the outer ring, the hub, and the inner ring; An apparatus for manufacturing a wheel bearing assembly, wherein the wheel bearing assembly orbitally forms the distal end of the hub toward the inner ring in a radially outward direction. A base supporting the hub when orbital forming the hub by installing the hub on an upper surface thereof; A molding tool mounting portion mounted on an upper portion of the base; A rotating part that rotatably supports the outer ring independently of the molding tool mounting part and rotates the outer ring about the hub axis during orbital forming; And Rotatably mounted to the forming tool mounting portion, moveable along the hub axis with the forming tool mounting portion, rotate about a first axis inclined by a set angle with respect to the hub axis, and at the same time parallel to the hub axis A molding tool revolving about one second axis; Including, At least one of the forming tool mounting portion and the base is moved toward the other such that the forming tool is orbitally formed radially outwardly of the distal end of the hub towards the inner ring. The method of claim 1, Wherein the forming tool is cylindrical and the central axis of the forming tool coincides with the first axis. The method of claim 1, And a forming groove formed at a lower end of the forming tool to orbital form a distal end of the hub toward the inner ring in contact with the distal end of the hub. The method of claim 1, One side of the hub includes a flange protruding outward from the radius and a bolt hole for drilling the wheel and the hub of the vehicle coupled to the flange, The base is formed with a guiding groove at a position corresponding to the bolt hole, And a guiding pin is inserted into the bolt hole and the guiding groove to guide the hub to have a set movement to reduce stress concentrated on the rolling element during orbital forming. The method of claim 4, wherein And a predetermined movement of the hub is generated by a rotational movement of the guiding pin in the bolt hole. The method of claim 4, wherein And a predetermined movement of the hub is an up and down reciprocating motion of the hub within a predetermined range. The method of claim 6, When the hub is in the vertical reciprocating motion, the manufacturing tool of the wheel bearing assembly, characterized in that the forming tool also reciprocating up and down in contact with the hub. One end is coupled to the wheel of the vehicle, and the other end includes a hub having a stepped portion and a distal end portion, an inner ring mounted on the stepped portion of the hub, an outer ring mounted on the vehicle body, and a rolling element interposed between the outer ring, the hub, and the inner ring; A method of manufacturing a wheel bearing assembly in which a molding tool rotates in a wheel bearing assembly and contacts the distal end of the hub to orbital form the distal end of the hub radially outward toward the inner ring. At least one of the forming tool and the hub moves toward the other to cause the forming tool to contact the distal end of the hub, The outer ring to rotate about the hub axis when orbital forming, The forming tool rotates about a first axis inclined by a set angle with respect to the hub axis, at the same time revolves around a second axis parallel to the hub axis, and orbitally forms the distal end of the hub outward toward the inner ring. Method of producing a wheel bearing assembly, characterized in that. The method of claim 8, And the hub is guided to have a set movement in order to reduce stress concentrated on the rolling element during orbital forming. The method of claim 8, And the rotation speed of the outer ring is slower than the rotation and idle speed of the forming tool.

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