JP-2026075114-A - Crimping joint method, method for manufacturing hub unit bearings, method for manufacturing vehicles, method for manufacturing mechanical equipment, and crimping apparatus

Abstract

[Problem] To provide a crimping joint method, a method for manufacturing a hub unit bearing, a method for manufacturing a vehicle, a method for manufacturing a machine device, and a crimping device that are advantageous in reducing manufacturing costs and/or improving product quality. [Solution] The step of forming the crimped portion includes deforming the first member (17a) using a first relative rotation around a reference axis between the first press die (39) and the workpiece (90), and further deforming the first member (17a) using a second relative rotation around a reference axis between the second press die (39) and the workpiece (90). In the first relative rotation, the central axis of the first press die (39) is inclined with respect to the reference axis at a first inclination angle (θ 1 ), and in the second relative rotation, the central axis of the second press die (39) is inclined with respect to the reference axis at a second inclination angle (θ 2 ) different from the first inclination angle. [Selection Diagram] Figure 5

Inventors

• 中村 誠司
• 水嶋 勇貴

Assignees

• 日本精工株式会社

Dates

Publication Date

20260507

Application Date

20260227

Priority Date

20240405

Claims (12)

1. A step of setting a workpiece, in which the first member and the second member are assembled in the axial direction, along a reference axis, A step of forming a crimped portion on the first member, comprising: deforming the first member using a first relative rotation around the reference axis between the first press die and the workpiece; and further deforming the first member using a second relative rotation around the reference axis between the second press die and the workpiece, Equipped with, In the first relative rotation, the central axis of the first mold is inclined with respect to the reference axis at a first inclination angle. In the second relative rotation, the central axis of the second mold is tilted with respect to the reference axis at a second inclination angle different from the first inclination angle. Crimping joint method.
2. Between the center of the first inclination angle and the center of the second inclination angle, the axial positions are different from each other. The crimping and joining method according to claim 1.
3. The center of the second inclination angle is located outward in the axial direction, near the end of the first member where the crimped portion is provided, compared to the center of the first inclination angle. The crimping method according to claim 1 or 2.
4. The first mold and the second mold are either the same mold or different molds. A crimping and joining method according to any one of claims 1 to 3.
5. The first mold and the second mold are the same single mold. The process further includes separating the first mold from the workpiece between the first relative rotation and the second relative rotation. A crimping and joining method according to any one of claims 1 to 3.
6. A method for manufacturing a hub unit bearing, comprising manufacturing the hub unit bearing using the crimping coupling method described in any one of claims 1 to 5.
7. A hub unit bearing is manufactured using the manufacturing method described in claim 6, Assembling the vehicle using the aforementioned hub unit bearing, A method for manufacturing a vehicle, comprising the following features.
8. A crimped assembly is manufactured using the crimping method described in any one of claims 1 to 5, Assembling a mechanical device using the aforementioned crimped assembly, A method for manufacturing a mechanical device that includes the following:
9. Reference axis and, A holder that supports the workpiece, A mold having a central axis, A first mechanism performs relative rotation between the workpiece and the press mold, in which the central axis is inclined with respect to the reference axis, around the aforementioned reference axis. The system includes a second mechanism for changing the inclination angle of the central axis with respect to the reference axis, In the first relative rotation, the central axis of the mold is inclined with respect to the reference axis at a first inclination angle, and in the second relative rotation, the central axis of the mold is inclined with respect to the reference axis at a second inclination angle different from the first inclination angle. Crimping machine.
10. Between the center of the first tilt angle and the center of the second tilt angle, the axial positions are different from each other. The crimping apparatus according to claim 9.
11. The first mechanism has a first drive source, The second mechanism has a second drive source different from the first drive source. The crimping apparatus according to claim 9 or 10.
12. The mold comprises a first mold used for the first relative rotation and a second mold used for the second relative rotation. The first mold and the second mold are either the same mold or different molds. A crimping apparatus according to any one of claims 9 to 11.

Description

The present invention relates to a crimping coupling method, a method for manufacturing a hub unit bearing, a method for manufacturing a vehicle, a method for manufacturing a mechanical device, and a crimping apparatus. This application claims priority based on Japanese Patent Application No. 2024-061434, filed on April 5, 2024, and the contents of that application are incorporated herein by reference. A hub unit bearing is known as an example of a crimped assembly in which a first member and a second member are combined in the axial direction. Automobile wheels and braking rotating bodies are rotatably supported by a hub unit bearing relative to the suspension system. A hub unit bearing comprises an outer ring having double rows of outer ring raceways on its inner circumferential surface, a hub having double rows of inner ring raceways on its outer circumferential surface, and a plurality of rolling elements arranged to roll freely between the double rows of outer ring raceways and the double rows of inner ring raceways. The hub comprises an inner ring and a hub body (hub ring). The inner ring is press-fitted onto a fitting shaft portion located on the axially inner portion of the hub body (the axially inner portion of the hub body when the hub unit bearing is assembled to the vehicle), with its axially outer end face (the outer end face in the width direction of the vehicle body when the hub unit bearing is assembled to the vehicle) abutting against a stepped surface located in the axially middle portion of the hub body and facing axially inward. In this state, a crimped portion, formed by plastically deforming a cylindrical portion of the fitting shaft portion that protrudes axially inward from the axially inner end face of the inner ring radially outward, presses against the axially inner end face of the inner ring. This connects and fixes the inner ring to the hub body and applies preload to the rolling elements. Japanese Patent Publication No. 2015-77616 describes a rocking crimping method for joining a hub body and an inner ring. This method involves using a mold (stem die) supported to rotate around a central axis inclined with respect to a reference axis coaxial with the central axis of the hub body. The mold's tip is pressed against a cylindrical portion, and the mold is rotated around the reference axis to plastically deform the cylindrical portion radially outward, thereby forming a crimped portion. In the rocking crimping method described in Japanese Patent Publication No. 2015-77616, the processing load is kept low by setting the rocking angle, which is the inclination angle of the central axis of the mold relative to the reference axis, to 15° or more and 30° or less. Japanese Patent Publication No. 2015-77616 Figure 1 is a cross-sectional view showing an example of a wheel drive unit equipped with a hub unit bearing.Figure 2 is a schematic cross-sectional view showing a crimping device.Part (A) of Figure 3 is a cross-sectional view showing a portion of the crimping device, and part (B) is a view showing the device with a different oscillation angle than in part (A).Sections (A) and (B) of Figure 4 are diagrams illustrating the mechanism for changing the oscillation angle; section (a) is a view from the axial direction, and section (b) is a perspective view.Sections (A) to (E) of Figure 5 are schematic cross-sectional diagrams showing the crimping method in order of steps.Figure 6 is a schematic diagram of a vehicle equipped with a hub unit bearing. The embodiments of the present invention will be described below with reference to the drawings. In one embodiment, the crimping method involves fitting a cylindrical metal second member onto a metal first member having a cylindrical portion at one end on its axial side. Then, the axial end of the cylindrical portion is plastically deformed to form a crimped portion. The first and second members are joined by preventing the axial displacement of the second member relative to the first member. The crimping method and crimping apparatus are widely applicable to the manufacture of machinery, vehicles, or components thereof, including two metal members joined by the crimped portion. In one embodiment, the crimping coupling method and crimping apparatus are applied to the manufacture of hub unit bearings that constitute a vehicle. In the following description, there are some differences in the shape of the details between the drawings, but the parts with the same reference numerals are equivalent in content and function. This disclosure can be applied to the manufacture of hub unit bearings for drive wheels, in which a central hole is provided in the center of the hub that penetrates axially, and to the manufacture of hub unit bearings for driven wheels, in which the hub is solid. Furthermore, this disclosure can be applied to both the manufacture of hub unit bearings having face splines on the axial end face of the crimped portion, and the manufacture