JPH08192324A - Centering hold device for outer ring - Google Patents

Abstract

PURPOSE: To enable a reference axial line for a centering process to coincide with the axial core of a track groove, and thereby enable processing accuracy to be effectively secured. CONSTITUTION: The centering hold device is equipped with a centering mechanism 20 centering an outer ring member 12 on the basis of a track groove 18, a hold mechanism 22 holding the shaft section 14 of the outer ring member 12, and with a back-up mechanism 22 guiding the shaft section 14 to the hold mechanism 22. And a centering mechanism 20 is equipped with a ball chuck 30 provided with balls to be engaged with the track groove 18, and with an extension and contraction means 32 which advances and draws the ball chuck 30 to the radial direction of a cup shaped section 16 in such a way as to be freely engaged with/disengaged from the track groove 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer ring member centering and holding device for centering and holding the outer ring member during machining of the outer ring member.

[0002]

2. Description of the Related Art Usually, an outer ring member constituting a constant velocity universal joint is forged in several steps from a raw material to be formed into a cup shape with a shaft, and then turned, heat treated, polished and assembled. Through the above, it is molded into a desired shape.

In this case, in the forging step, after the shaft portion is formed in the raw material, a final forging step is performed to finish the inside and outside of the cup-shaped portion, that is, the step of forming the inner spherical track groove and the step of forming the outer shape. And are performed at the same time. Then, when performing turning, which is the first step of machining,
A centering step is provided for determining the total length of the material including the shaft portion and forming a processing standard that is a standard for subsequent processing.

[0004]

In the above forging process,
Since the step of forming the track groove and the step of forming the outer shape are performed after the step of forming the shaft portion, the concentricity between the shaft portion and the track groove cannot be ensured. However, in the first step of machining, when the tip of the shaft is cut to determine the total length of the material and at the same time a centering hole is formed at the tip of the material, the standard for holding the material is near the tip of the shaft. It is an outer diameter portion near the opening end of the cup-shaped portion. Therefore, a deviation occurs between the reference axis of the centering process and the axis of the track groove, which lowers the processing accuracy and causes abnormal noise when actually used as a constant velocity universal joint, for example. A problem has been pointed out.

The present invention is intended to solve this kind of problem, and the reference axis of the centering step and the axis of the track groove can be made to coincide with each other, and the processing accuracy can be effectively maintained. An object is to provide a centering and holding device for an outer ring member.

[0006]

In order to achieve the above object, the present invention has a plurality of tracks which have a shaft portion and a cup-shaped portion and are circumferentially spaced from each other on the inner spherical surface of the cup-shaped portion. A centering and holding device for centering and holding an outer ring member provided with a groove, wherein a centering mechanism for centering the outer ring member with the track groove as a reference, and a shaft portion of the outer ring member are held. And a holding mechanism for
A support means provided with a sphere that engages with the track groove; and an expansion / contraction means capable of engaging and disengaging the sphere in the track groove by moving the support means forward and backward in the radial direction of the cup-shaped portion. And

[0007]

In the centering and holding device for the outer ring member according to the present invention,
When the expansion / contraction means is driven with the support means constituting the centering mechanism arranged in the cup-shaped portion of the outer ring member, the support means moves radially outward of the cup-shaped portion. Therefore, the sphere provided on the support means engages with the track groove of the cup-shaped portion, and the outer ring member is centered with reference to this track groove. As a result, the reference axis of the centering process and the axis of the track groove can be surely aligned with each other.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The centering and holding device for an outer ring member according to the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates a centering and holding device according to this embodiment. The centering and holding device 10
The outer race member 12 which is an outer race of a constant velocity universal joint is centered and held, and the outer race member 12 includes a shaft portion 14
And a plurality of track grooves 18 are formed on the inner spherical surface of the cup-shaped portion 16 so as to be spaced apart from each other in the circumferential direction.

The centering and holding device 10 includes a centering mechanism 20 for centering the outer ring member 12 with reference to the track groove 18.
And a holding mechanism 2 for holding the shaft portion 14 of the outer ring member 12.
2 and a backup mechanism 24 for guiding the shaft portion 14 to the holding mechanism 22.

As shown in FIG. 2, a main body 26 constituting the centering mechanism 20 is provided with a ball chuck (supporting means) 30 provided with three balls (spheres) 28 which engage with the track grooves 18. The ball chuck 30 is attached to the cup-shaped portion 16
The ball 28 is moved in the radial direction (arrow A direction) and the ball 28 is attached to and detached from the track groove 18 by an expandable / contractible means 32.

As shown in FIG. 3, the ball chuck 30 is a slide member 34a which is spaced from the disc-shaped end surface of the body portion 26 at equal angular intervals and is movable in the radial direction of the body portion 26.
~ 34c. As shown in FIG. 2, an eccentric bush 40 is provided on one surface of the slide member 34a via a bolt 36 and a disc spring 38.
Is fitted to the claw member 42. The claw member 42 has a bent shape, and a pressing member 44 is fixed to the tip of the claw member 42, and a holding member 46 is fixed to the claw member 42. The ball 28 is held by the pressing member 44 and the inclined surface 48 formed at the tip of the holding member 46.

A cam member 52 is fixed to the other surface of the slide member 34a via a block body 50. The cam member 52 has a first inclined surface 54 provided on the end surface and a second inclined surface 58 provided by forming a recess 56.
With. The first and second inclined surfaces 54 and 58 are parallel to each other and are inclined toward the center toward the ball chuck 30 side (arrow B1 direction in FIG. 2).

The side of the slide member 34b is constructed in the same manner as the side of the slide member 34a, and the same components are designated by the same reference numerals and detailed description thereof will be omitted.
A reference bush 40a is provided instead of the eccentric bush 40 on the slide member 34c side.
4c is set as the reference position, while the slide member 3
4a and 34b are configured such that their positions can be adjusted via the eccentric bush 40.

The expansion / contraction means 32 includes a cylinder 60, and a rod 62 extending from the cylinder 60 in the direction of arrow B1.
The drive cam 64 is supported at the tip of the. The drive cam 64 is
A first drive slope 66 and a recess 56 that are engaged with each cam member 52 and are engageable with the first slope 54 of the cam member 52.
Second drive slope 6 that can enter the second slope 58 and engage with the second slope 58.
And 8 (see FIGS. 2 and 4).

As shown in FIGS. 5 and 6, the holding mechanism 2
2 has a base 72, and lock means 74a to 74c are mounted on the base 72 at equal angular intervals. Each of the locking means 74a to 74c includes a cylinder 76, and a spherical member 80 is fixed to the tip of a rod 78 extending from each cylinder 76 toward the same center position.

The backup mechanism 24 has a shaft 82 mounted on a base 72 so as to be movable back and forth in the direction of arrow B, and a guide member 84 is provided at one end of the shaft 82. The guide member 84 has a substantially ring shape in which a part (upper side in the figure) is cut out, and the inner diameter thereof is the shaft portion 1 of the outer ring member 12.
It corresponds to a diameter of 4 (see FIG. 6). A spring 86 is engaged with the shaft 82, and the shaft 82 is
Is urged toward the centering mechanism 20 side (direction of arrow B2) via the spring 86.

Next, the operation of the centering and holding device 10 thus constructed will be described.

First, the outer ring member 12 after the forging process is completed.
Is transported to the centering step by a loader (not shown) and temporarily held by this loader and the holding mechanism 22.

Then, when the main body portion 26 constituting the centering mechanism 20 is moved in the direction of the arrow B1, the tip of the ball chuck 30 enters the cup-shaped portion 16 of the outer ring member 12, and the ball 28 moves into this cup. Track groove 18 of the groove 16
And presses the outer ring member 12 toward the holding mechanism 22 side. Therefore, the outer ring member 12 is sandwiched between the ball 28 and the guide member 84 that constitutes the backup mechanism 24, and it is possible to reliably prevent the outer ring member 12 from falling (lifting).

Next, when the cylinder 60 constituting the expansion / contraction means 32 is driven and the rod 62 extends in the direction of arrow B1, the first drive slope 66 of the drive cam 64 supported by the tip of the rod 62 causes the cam members 52 to move. Engages the first inclined surface 54 of. Therefore, the cam member 52 moves outward (arrow A1).
Direction), and the slide members 34a to 34c move integrally in the direction of arrow A1 via the block body 50 fixed to the cam member 52.

As a result, each ball 28 has a cup-shaped portion 1
6 moves radially outward (direction of arrow A1) to clamp the inner part of the track groove 18, and each holding member 46
Clamps near the open end of the track groove 18 (see FIG. 2). As a result, the outer ring member 12 has the track groove 18
With the holding mechanism 22 centered with reference to
4 is retained. In this holding mechanism 22, each cylinder 7
Under the action of 6, the spherical member 80 advances integrally with the rod 78, and the spherical portion of the spherical member 80 is the shaft portion 1 of the outer ring member 12.
4 is pressed and held.

Then, as shown in FIG. 1, the tool 90 is driven to center the shaft portion 14.
After the centering process, the cylinder 60 constituting the expansion / contraction means 32 is driven in the opposite direction, and when the rod 62 extends in the direction of the arrow B2, the second drive slope surface 68 of the drive cam 64 causes the second slope surface 58 of each cam member 52 to move. Engage with. Therefore, the cam member 52 moves inward in the radial direction (arrow A2 direction) integrally with the slide members 34a to 34c, and the ball 28 and the holding member 46 are separated from the track groove 18.

In this case, in this embodiment, each ball 28 clamps the inner part of the track groove 18 and each holding member 46 clamps the vicinity of the opening end of the track groove 18, whereby the outer ring member 12 is deformed. Centering is performed based on the track groove 18. Therefore, the reference axis of the centering process and the axis of the track groove 18 can be easily and surely aligned with each other, and the coaxiality of each processed portion can be effectively maintained. Therefore, the product quality of the outer ring member 12 is improved all at once, and, for example, the effect of preventing the generation of abnormal noise when actually used as a constant velocity universal joint is obtained.

Moreover, for example, it is not necessary to provide a reference seat for forming the shaft core in the cup-shaped portion 16 with respect to the outer diameter shaft core of the outer ring member 12, and the number of steps is reduced as compared with the conventional case, and the outer ring member is reduced. It is possible to improve the efficiency of the entire 12 molding processes.

[0026]

According to the centering and holding device for an outer ring member according to the present invention, the following effects and advantages are obtained.

The outer ring member is centered on the basis of the track groove by engaging the sphere provided on the supporting means constituting the centering mechanism with the track groove of the cup-shaped portion of the outer ring member. . As a result, the reference axis of the centering process and the axis of the track groove can be surely aligned with each other, and product quality can be effectively improved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a centering and holding device according to the present invention.

FIG. 2 is a vertical cross-sectional explanatory view of a main part of the centering and holding device.

FIG. 3 is a front view of a ball chuck that constitutes the centering and holding device.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a side view of a holding mechanism and a backup mechanism that form the centering holding device.

FIG. 6 is a front view of the holding mechanism and the backup mechanism.

[Explanation of symbols]

10 ... Centering / holding device 12 ... Outer ring member 14 ... Shaft part 16 ... Cup-shaped part 18 ... Track groove 20 ... Centering mechanism 22 ... Holding mechanism 24 ... Backup mechanism 28 ... Ball 30 ... Ball chuck 32 ... Expansion / contraction means 34a to 34c. …
Slide member 42 ... Claw member 46 ... Holding member 52 ... Cam member 64 ... Drive cam 84 ... Guide member

Claims (2)

[Claims] 1. A centering and holding device for centering and holding an outer ring member having a shaft portion and a cup-shaped portion and a plurality of track grooves circumferentially spaced from each other on an inner spherical surface of the cup-shaped portion. An apparatus, comprising: a centering mechanism that centers the outer ring member with the track groove as a reference; and a holding mechanism that holds a shaft portion of the outer ring member, wherein the centering mechanism includes the track groove. An outer ring that has a sphere that engages with the sphere, and an expansion / contraction means that allows the sphere to be engaged with and disengaged from the track groove by advancing and retracting the sphere in the radial direction of the cup-shaped portion. A member centering and holding device. 2. The centering and holding device for an outer ring member according to claim 1, further comprising a backup mechanism for guiding a shaft portion of the outer ring member to the holding mechanism.