JPH05138665A - Manufacture of slide spline shaft - Google Patents

Abstract

PURPOSE:To obtain a resin film having no defects of air bubble and prevent a center bore from being coated with the resin film. CONSTITUTION:A jig 10 is provided which serves to support an outer shaft member 2 having an inner diameter spline 1 via a sealing member 13, and in a cylinder 12 provided on the jig 10, a slidable body 14 is housed, and a center 15 is extended from the slidable body 14 passing through the bottom part of the cylinder 12 and the sealing member 13, and the center is urged by a spring 16 upward and, at the same time, regulated at the lowering end thereof by a stopper 17 and, further, an inner member 4 having an outer diameter spline 3 is inserted into the outer member by the center 15 under alignment. Resin liquid 7 supplied beforehand Into the inner part of the outer shaft member 2 is pushed up between both shaft members 2,4, and an pushing-up operation of the resin liquid 7 is stopped at a position where the tip end of the inner shaft member 4 does no press the sealing member 13 and, after preventing air bubbles 9 from being pushed into the resin liquid, the resin is caused to harden.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for manufacturing a slide spline shaft which is slidably spline-coupled to each other through a resin film.

[0002]

2. Description of the Related Art In order to manufacture a slide spline shaft of this type, generally, an outer shaft member having an inner diameter spline is used as a female type, and an inner shaft member having an outer diameter spline is used as a male type. A resin liquid is filled in between and cured to form a resin film on either one of the inner diameter spline and the outer diameter spline (for example, JP-A-61-184222, JP-A-61-184222). 60-1780
(See No. 13, etc.). 6 and 7 show a conventional apparatus for manufacturing a slide spline shaft as described above, which is inserted into an outer shaft member 2 having an inner diameter spline 1 from one end side thereof and the inner diameter spline is inserted through a seal member 6. A jig 5 that engages with one end of and supports the jig upright is provided, and the inner shaft member 4 having the outer diameter spline 3 can be inserted into the outer shaft member 2 supported by the jig 5.

The sealing member 6 is made of rubber, for example, and has a ring shape, and is integrally formed on the upper end of the jig 5. On the outer periphery of the upper end portion of the seal member 6, an outer peripheral taper portion 6a that can be fitted to the lower end taper portion 1a of the inner diameter spline 1 of the outer shaft member 2 is formed (FIG. 7), and the jig 5 holds the seal member 6 in place. The outer shaft member 2 is indirectly supported via the interposition. Further, an inner peripheral taper portion 6b connected to the taper portion 5a formed on the upper end portion of the jig 5 is formed on the inner periphery of the upper end portion of the seal member 6 (FIG. 7). These taper portions 5a and 6b can be fitted into the taper portion 4a formed at the tip end portion of the inner shaft member 4, and the inner shaft member 4 inserted into the outer shaft member 2 has the tip end taper portion 4a. By fitting the flanges 4b fitted to the tapered portions 5a and 6b and provided at the base end portions thereof to the open end portions of the outer shaft member 2, the outer shaft member 2 is positioned concentrically with the outer shaft member 2. Is becoming

In order to manufacture a slide spline with the manufacturing apparatus configured as described above, the spline (in this case, the outer shaft in this case) of the shaft member (inner shaft member 4 in this case) on which the resin film is to be formed is the mating shaft member. A mold release agent is applied to the inner diameter spline 1) of the shaft member 2, and first, as shown in FIG. 6, the outer shaft member 2 is fitted and supported by the jig 5, and the seal member 6 in the outer shaft member 2 is supported. A predetermined amount of the resin liquid 7 is supplied onto the jig 5 including, and then the inner shaft member 4 is inserted into the outer shaft member 2. Then, the resin liquid 7 is gradually pushed up between the outer shaft member 2 and the inner shaft member 4, and the tip tapered portion 4a of the inner shaft member 4 is fixed to the jig 5 as shown in FIG.
In the centering state in which the taper parts 5a and 6b of the seal member 6 are fitted and the flange 4b of the base end part is fitted to the open end part of the outer shaft member 2, the inner diameter spline 1 and the outer diameter spline 3 are The space is completely filled with the resin liquid 7. Therefore, after that, the outer shaft member 2 and the inner shaft member 4 are held at the curing temperature of the resin liquid 7 to cure the resin, and then the inner shaft member 4 is removed from the outer shaft member 2 to remove the inner shaft member 4. The outer diameter spline 3 is covered with the resin film 8 as shown in FIG.

[0005]

However, according to the above-mentioned conventional slide spline shaft manufacturing apparatus, when the resin liquid 7 is supplied into the outer shaft member 2, the inner diameter spline 1 is provided.
Lower end taper portion 1a and outer peripheral taper portion 6a of the seal member 6
It is difficult for the resin liquid 7 to infiltrate into the space between and, and bubbles 9 will remain in this portion (FIG. 6). Then, the residual bubbles 9 are extruded into the resin liquid 7 by the seal member 6 being pressed by the inner shaft member 4 during the later centering (FIG. 8), and remain in the resin liquid 7 as it is. As shown in FIGS. 9 and 10, there is a problem that a partial cutout 8a occurs in the resin film 8.

Further, although a center hole 4c necessary for machining and assembling is formed at the tip of the inner shaft member 4 (FIG. 8), according to the above-mentioned conventional manufacturing apparatus, the resin liquid 7 is used as the inner shaft member. Since the end face of the member 4 is rotated, the center hole 4c is covered with the resin film 9 as shown in FIGS. 9 and 11,
As a result, there is also a problem that a troublesome procedure for separately removing the resin film in this portion is required and an increase in manufacturing cost cannot be avoided.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to obtain a resin film without bubble defects and to cover the center hole with the resin film. It is an object of the present invention to provide a manufacturing apparatus for a slide spline shaft that can prevent the occurrence of damage.

[0008]

In order to achieve the above-mentioned object, the present invention inserts an outer shaft member having an inner diameter spline from one end side thereof and engages with one end of the inner diameter spline through a seal member. A jig for supporting the shaft member upright is provided, and an inner shaft member having an outer diameter spline is inserted into the outer shaft member from the other end side, and a resin liquid previously supplied into the outer shaft member is applied to the inner shaft member. Between the outer shaft member and the outer shaft member, and then cured to form a resin film on either one of the inner diameter spline and the outer diameter spline to form a resin film. A cylinder portion is provided in the cylinder body, and a slide body is provided in the cylinder portion so as to be slidable in the vertical direction. The slide body penetrates the jig and extends upward, and the center hole of the inner shaft member is provided. A fitting center is integrally provided, the jig is always provided with an urging means for urging the sliding body upward, and a stopper for restricting a relative position between the outer member and the inner member is provided. And

[0009]

In the slide spline shaft manufacturing apparatus configured as described above, the center of the inner shaft member is engaged with the center of the inner shaft member and the stopper restricts the relative position between the outer member and the inner member. The centering of the member can be performed without bringing the tip of the member into contact with the sealing member, and therefore the sealing member is not pressed and bubbles are not expelled into the resin liquid. In addition, since the center hole of the inner shaft member is closed at the center, even if the resin liquid flows to the end surface side of the inner shaft member, the center hole is not covered with the resin film.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 to 4 show an apparatus for manufacturing a slide spline shaft according to the present invention. In these figures, the same parts as those shown in FIGS. 6 and 7 are designated by the same reference numerals, and the description thereof will be omitted here. In this embodiment, a jig for supporting the outer shaft member 2
Reference numeral 10 denotes a shaft-shaped jig main body 11 and a bottomed cylinder 12 connected to the upper end of the jig main body 11 (FIG. 3). On the other hand, a seal is provided between the jig 10 and the outer shaft member 2. Seal member
13 is formed in a disk shape and is connected to the cylinder 12. On the outer periphery of the upper end of the seal member 13, there is formed an outer peripheral taper portion 13a which can be fitted to the lower end taper portion 1a of the inner diameter spline 1 of the outer shaft member 2 (FIG. 2). The outer shaft member 2 is indirectly supported via the interposition. The seal member 13 is made of rubber here, and is integrally formed with the cylinder 12 including the key 12a (FIG. 2) protruding from the cylinder 12.

A sliding body 14 is slidably provided in the cylinder 12 of the jig 10. The upper end of the sliding body 14 penetrates the bottom of the cylinder 12 and the seal member 13 to form a center. 15 is extended upwards. The center 15 is for concentrically positioning the inner shaft member 4 inserted in the outer shaft member 2, and has a conical portion 15a which is engageable with the center hole 4c of the inner shaft member 4 at the tip thereof. .. Further, a vertical hole 11a opened at the upper end is provided at the axial center position of the jig body 11.
A compression spring 16 for urging the sliding body 14 upward is disposed in the vertical hole 11a. Sliding body 14
Is positioned at the ascending end that normally abuts the bottom of the cylinder 12 under the biasing force of the compression spring 16.
It receives the pushing force of the inner shaft member 4 via 15 and descends. The lower end of the sliding body 15 is regulated by the upper end (stopper) 17 of the jig body 11, and the center 15 is the sealing member at the lower end.
A slight gap 18 is formed between the lower end of the inner shaft member 4 and the seal member 13 by slightly projecting above 13 (FIG. 4).

The operation of the slide spline shaft manufacturing apparatus configured as described above will be described below.

When manufacturing the slide spline shaft,
An outer shaft member 2 in which a release agent is applied to the inner diameter spline 1 in advance is prepared. First, as shown in FIG. 1, the outer shaft member 2 is fitted and supported by a jig 10, and then the outer shaft member 2 A predetermined amount of the resin liquid 7 is supplied onto the jig 10 including the seal member 13. At this time, the lower end tapered portion 1 of the inner diameter spline 1
a and the outer peripheral taper portion 13a of the seal member 13
Does not enter smoothly, and bubbles 9 remain in this portion (FIGS. 1 and 2). Next, the inner shaft member 4 is inserted into the outer shaft member 2. Then, the center 15 engages with the center hole 4a of the inner shaft member 4, the center 15 together with the inner shaft member 4, that is, the sliding body 14 descends against the urging force of the compression spring 16, and the resin liquid 7 is discharged from the outer shaft. Member 2 and inner shaft member 4
It is gradually pushed up between and.

Finally, as shown in FIG.
14 is brought into contact with the upper end 17 of the jig body 11 to stop the center 15 from descending, and the flange 4b of the inner shaft member 4 is fitted into the opening end portion of the outer shaft member 2 to Then, the inner shaft member 4 is positioned concentrically. In this state, the resin liquid 7 is completely filled between the inner diameter spline 1 and the outer diameter spline 3, but a slight gap 18 is formed between the tip of the inner shaft member 4 and the seal member 13. Therefore, the seal member 13 is not pressed by the inner shaft member 4, so that the bubbles 9 are not expelled into the resin liquid 7. After that, if the outer shaft member 2 and the inner shaft member 4 are held at the curing temperature of the resin liquid 7 to cure the resin, and then the inner shaft member 4 is released from the outer shaft member 2, the inner shaft member 4 is removed. The outer diameter spline 3 is covered with a resin film 8 as shown in FIG.

However, since the bubbles 9 are not expelled into the resin liquid 7 in the resin coating process as described above, the resin film 8 thus obtained has no voids due to the bubbles. Moreover, since the center hole 4c of the inner shaft member 4 is closed by the center 15, an opening 8b as a trace of the center 15 is formed in the portion of the resin film corresponding to the center hole 4c. It can be used for subsequent machining or assembly. Further, since the inner shaft member 4 is positioned with high accuracy with respect to the outer shaft member 2 by fitting the center 15 engaging with the center hole 4c and the flange 4b thereof and the outer shaft member 2, the resin obtained The thickness of the film 8 becomes uniform, and the sliding characteristics of the slide spline shaft become stable.

In the above embodiment, the stopper for restricting the descending end of the center 15, that is, the sliding body 14 is provided at the upper end of the jig body 11, but the present invention does not limit the position at which this stopper is provided. The protrusion may be formed on the inner surface of the cylinder 12 or the inner surface of the outer shaft member.

[0018]

As described above in detail, according to the slide spline shaft manufacturing apparatus of the present invention, the inner shaft member can be centered without contacting the tip of the inner shaft member with the seal member. As a result, air bubbles will not be expelled into the resin liquid during the resin coating process, and there is an effect that a resin film having no defects such as lack of wall can be formed. Also,
Since the center hole of the inner shaft member is closed by the center, the center hole is not covered with the resin film, and the center hole can be used for subsequent processing, assembly, etc., and the manufacturing cost can be reduced. There is an effect that can be achieved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a main part structure of an apparatus for manufacturing a slide spline shaft according to the present invention.

FIG. 2 is an enlarged cross-sectional view showing a part of the manufacturing apparatus.

FIG. 3 is a sectional view showing a support structure for an outer shaft member in the present manufacturing apparatus.

FIG. 4 is a cross-sectional view showing a mode of use of the present manufacturing apparatus.

FIG. 5 is a cross-sectional view showing a covering state of a resin film on a slide spline shaft obtained by the present manufacturing apparatus.

FIG. 6 is a cross-sectional view showing the structure of a conventional apparatus for manufacturing a slide spline shaft.

FIG. 7 is a cross-sectional view showing an enlarged part of a conventional manufacturing apparatus.

FIG. 8 is a cross-sectional view showing how the conventional manufacturing apparatus is used.

FIG. 9 is a cross-sectional view showing a coating state of a resin film on a slide spline shaft obtained by a conventional manufacturing apparatus.

FIG. 10 is an enlarged cross-sectional view of part A of FIG.

11 is an enlarged sectional view of a B part in FIG. 9.

[Explanation of symbols]

 1 Inner diameter spline 1a Lower end tapered portion of inner diameter spline 2 Outer shaft member 3 Outer diameter spline 4 Inner shaft member 4c Center hole 7 Resin liquid 8 Resin film 10 Jig 12 Cylinder 13 Seal member 14 Sliding body 15 Center 16 Biasing means (compression) Spring) 17 Stopper

Claims (1)

[Claims] 1. A jig which is inserted into an outer shaft member having an inner diameter spline from one end side thereof and which engages with one end of the inner diameter spline via a seal member to support the outer shaft member upright, is provided with an outer diameter spline. The inner shaft member having the above is inserted into the outer shaft member from the other end side, and the resin liquid previously supplied into the outer shaft member is pushed up between the inner shaft member and the outer shaft member, and is cured as it is. In a device for manufacturing a slide spline shaft in which either the inner diameter spline or the outer diameter spline is coated with a resin film, a cylinder portion is provided in the jig and slides vertically in the cylinder portion. A sliding body is freely arranged, and the sliding body is integrally provided with a center that extends through the jig and extends upward to engage with the center hole of the inner shaft member. An apparatus for manufacturing a slide spline shaft, comprising: an urging means for urging the moving body upward, and a stopper for restricting a relative position between the outer member and the inner member.