STAKING APPARATUS AND STAKING METHOD FOR BEARING UNIT, MANUFACTURING METHOD AND MANUFACTURING APPARATUS OF HUB UNIT BEARING, AND MANUFACTURING METHOD OF VEHICLE

Abstract

A plurality of press rolls (33) each having an inclined roll central axis (β) are used. Each of press rolls (33) and a hub ring (22z) are relatively rotated while pressing a roll processing surface portion (34) of each of the press rolls (33) against a plurality of locations of a tubular portion (25) of the hub ring (22z) in a circumferential direction to plastically deform the tubular portion (25).

Description

Claims

1. A staking apparatus for a bearing unit comprising: a reference axis;a base that supports a bearing unit in which a first member and a second member are combined in an axial direction;a first press die that has a first rotation axis; anda second press die that has a second rotation axis and is disposed apart from the first press die in a circumferential direction about the reference axis,wherein the first press die disposed such that the first rotation axis is inclined with respect to the reference axis and the second press die disposed such that the second rotation axis is inclined with respect to the reference axis are pressed against the bearing unit.

2. The staking apparatus for a bearing unit according to claim 1, wherein the first press die and the second press die move in the circumferential direction relative to the bearing unit.

3. The staking apparatus for a bearing unit according to claim 1, wherein the first press die has a first processing surface portion and a second processing surface portion disposed outward in a radial direction compared with the first processing surface portion,wherein the second press die has a third processing surface portion and a fourth processing surface portion disposed outward in a radial direction compared with the third processing surface portion, andwherein positions and/or postures of the first press die and the second press die are changed such that a part of the second processing surface portion and a part of the fourth processing surface portion are close to each other.

4. The staking apparatus for a bearing unit according to claim 1, further comprising: a third press die that has a third rotation axis and is disposed apart from the first press die and the second press die in the circumferential direction,wherein the first press die disposed such that the first rotation axis is inclined with respect to the reference axis, the second press die disposed such that the second rotation axis is inclined with respect to the reference axis, and the third press die disposed such that the third rotation axis is inclined with respect to the reference axis are pressed against the bearing unit.

5. A staking method for a bearing unit comprising: a step of preparing a first press die that has a first rotation axis, and a second press die that has a second rotation axis and is disposed apart from the first press die in a circumferential direction about a reference axis;a step of supporting a bearing unit in which a first member and a second member are combined in an axial direction on a base; anda step of pressing the first press die disposed such that the first rotation axis is inclined with respect to the reference axis and the second press die disposed such that the second rotation axis is inclined with respect to the reference axis against the bearing unit.

6. The staking method for a bearing unit according to claim 5, wherein the step of pressing includes moving the first press die and the second press die in the circumferential direction relative to the bearing unit.

7. The staking method for a bearing unit according to claim 5, wherein the first press die has a first processing surface portion and a second processing surface portion disposed outward in a radial direction compared with the first processing surface portion,wherein the second press die has a third processing surface portion and a fourth processing surface portion disposed outward in a radial direction compared with the third processing surface portion, andwherein positions and/or postures of the first press die and the second press die are changed such that a part of the second processing surface portion and a part of the fourth processing surface portion are close to each other.

8. The staking method for a bearing unit according to claim 5, wherein a third press die that has a third rotation axis and is disposed apart from the first press die and the second press die in the circumferential direction is further prepared, andwherein the step of pressing includes a step of pressing the first press die disposed such that the first rotation axis is inclined with respect to the reference axis, the second press die disposed such that the second rotation axis is inclined with respect to the reference axis, and the third press die disposed such that the third rotation axis is inclined with respect to the reference axis against the bearing unit.

9. A manufacturing method of a hub unit bearing which includes a shaft member and an inner ring fitted on the shaft member and in which an end surface of the inner ring on one side in an axial direction is held down with a staking portion formed by plastically deforming a tubular portion provided at an end portion of the shaft member on one side in an axial direction, wherein a plurality of press rolls which are disposed apart from each other in a circumferential direction about a central axis of the shaft member, each have a roll central axis inclined away from the central axis of the shaft member in a radial direction of the shaft member from one side toward the other side in the axial direction of the shaft member and an annular roll processing surface portion centered on the roll central axis, and are supported to freely rotate about the roll central axis are used, andwherein the method comprises a step of relatively rotating each of the press rolls and the shaft member about the central axis of the shaft member while pressing the roll processing surface portion of each of the press rolls against a plurality of locations of the tubular portion in the circumferential direction to plastically deform the tubular portion.

10. The manufacturing method of a hub unit bearing according to claim 9, wherein the plurality of press rolls are disposed at equal intervals in the circumferential direction about the central axis of the shaft member.

11. The manufacturing method of a hub unit bearing according to claim 9, wherein the step includes a first step and a second step,wherein, in the first step, while a processing force is applied from the roll processing surface portion of each of the press rolls to each of the plurality of locations of the tubular portion in the circumferential direction toward the other side in the axial direction of the shaft member and toward an outer side in the radial direction of the shaft member, a position where the processing force is applied is continuously changed in the circumferential direction of the tubular portion on the basis of the relative rotation, and the tubular portion is plastically deformed to be expanded toward the outer side in the radial direction while being crushed in the axial direction and to form a staking portion intermediary body, andwherein, in the second step, while a processing force is applied from the roll processing surface portion of each of the press rolls to each of the plurality of locations of the staking portion intermediary body in the circumferential direction toward the other side in the axial direction of the shaft member and toward an inner side in the radial direction of the shaft member, a position where the processing force is applied is continuously changed in the circumferential direction of the staking portion intermediary body on the basis of the relative rotation, and the staking portion intermediary body is plastically deformed to be pressed toward the inner side in the radial direction while being crushed in the axial direction and to form the staking portion.

12. The manufacturing method of a hub unit bearing according to claim 11, wherein a position of the press roll in an axial direction of the roll central axis in the second step is disposed to be shifted closer to the central axis of the shaft member than a position of the press roll in the axial direction of the roll central axis in the first step.

13. The manufacturing method of a hub unit bearing according to claim 11, wherein an inclination angle of the roll central axis with respect to the central axis of the shaft member in the second step is smaller than an inclination angle of the roll central axis with respect to the central axis of the shaft member in the first step.

14. The manufacturing method of a hub unit bearing according to claim 11, wherein a time point at which the first step ends is determined using a value of a torque for relatively rotating each of the press rolls and the shaft member about the central axis of the shaft member.

15. A manufacturing apparatus of a hub unit bearing which includes a shaft member and an inner ring fitted on the shaft member and in which an end surface of the inner ring on one side in an axial direction is held down with a staking portion formed by plastically deforming a tubular portion provided at an end portion of the shaft member on one side in an axial direction, the apparatus comprising: a support base; a plurality of press rolls; and a drive mechanism,wherein the support base is for supporting the shaft member,wherein the plurality of press rolls are disposed apart from each other in a circumferential direction about a central axis of the shaft member supported by the support base,wherein each of the press rolls has a roll central axis inclined away from the central axis of the shaft member in a radial direction of the shaft member from one side toward the other side in the axial direction of the shaft member supported by the support base and an annular roll processing surface portion centered on the roll central axis and is supported to freely rotate about the roll central axis, andwherein the drive mechanism has a function of relatively rotating each of the press rolls and the shaft member about the central axis of the shaft member while pressing the roll processing surface portion of each of the press rolls against a plurality of locations of the tubular portion in the circumferential direction to plastically deform the tubular portion.

16. The manufacturing apparatus of a hub unit bearing according to claim 15, wherein the plurality of press rolls are disposed at equal intervals in the circumferential direction about the central axis of the shaft member.

17. The manufacturing apparatus of a hub unit bearing according to claim 15, wherein each of the press rolls has a roll main body having the roll processing surface portion on an outer peripheral surface thereof and a pair of support shaft portions protruding from a radially central portion of the roll main body toward both sides in an axial direction of the roll main body and disposed coaxially with the roll central axis, and each of the pair of support shaft portions is supported to freely rotate about the roll central axis.

18. The manufacturing apparatus of a hub unit bearing according to claim 15, wherein the drive mechanism revolves each of the press rolls about the central axis of the shaft member to relatively rotate each of the press rolls and the shaft member about the central axis of the shaft member.

19. The manufacturing apparatus of a hub unit bearing according to claim 15, wherein the drive mechanism rotates the shaft member about the central axis of the shaft member to relatively rotate each of the press rolls and the shaft member about the central axis of the shaft member.

20. A manufacturing method of a vehicle including a hub unit bearing, wherein the hub unit bearing is manufactured using the staking method according to claim 5 .

21. A manufacturing method of a vehicle including a hub unit bearing, wherein the hub unit bearing is manufactured using the manufacturing method of a hub unit bearing according to claim 9.