JPH0524822Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a spline shaft (including a serration shaft; the same shall apply hereinafter) manufactured using a rolling rack.
Regarding the structure of

[Prior Art] Conventionally, there is a method of manufacturing a spline shaft by using a rolling rack to transfer the tooth profile (oblique tooth profile) of the press-fit tooth portion onto a material.

As shown in FIG. 10, the spline shaft thus produced is designed such that the press-fit tooth portion 2 of the spline shaft 1 is press-fitted into the spline hole 4 of the constant velocity joint 3, for example.

[Problems to be solved by the invention] However, with conventional spline shafts manufactured using such rolling racks, it is difficult to add any modifications to the tooth profile to be transferred, so the shaft end of the press-fit tooth portion The problem is that it is not possible to make insertion into the spline hole easier by tapering the tooth width of the spline, and therefore it is difficult to align the spline shaft and the spline hole and press fit the spline shaft into the spline hole. There is a point.

The present invention attempts to solve these problems, and aims to provide a spline shaft structure in which a spline shaft manufactured using a rolling rack can be easily press-fitted into a spline hole.

[Means for Solving the Problems] Therefore, the spline shaft structure of the present invention includes, in a spline shaft manufactured using a rolling rack, a tip guide tooth portion that can align and fit into a spline hole; It is characterized by comprising a press-fit tooth portion which is provided adjacent to the tip guide tooth portion in the same tooth formation phase as the tip guide tooth portion and is press-fitted into the spline hole. There is.

[Operation] In the above-described spline shaft structure of the present invention, in order to press fit the spline shaft into the spline hole, the tip guide tooth portion of the spline shaft is first fitted into the spline hole. When the tip guide tooth portion is completely inserted into the spline hole, the press-fit tooth portion is subsequently press-fitted into the spline hole.

[Example] Hereinafter, embodiments of the present invention will be explained with reference to the drawings. Figures 1 to 6 show a spline shaft structure as a first embodiment of the invention, and Figure 1 is a side view thereof, and Figure 2 is a side view thereof. The figure is an enlarged view of Figure 1, parts 3 and 4.
Each figure is a cross-sectional view to explain the procedure for press-fitting the spline shaft into the spline hole.
The figure is a schematic diagram for explaining a method of manufacturing a spline shaft using a rolling rack, and FIG. 6 is a side view showing a rolling rack for manufacturing this spline shaft.

Now, this spline shaft 1 is manufactured using a rolling rack, and as shown in FIGS. 1 and 2, this spline shaft 1 has a tip guide tooth portion 5.
and a press-fit tooth portion 2 formed adjacent to the tip guide tooth portion 5 with a groove portion 1a having a width of about 1 to 2 mm.

The tip guide tooth portion 5 is formed with standard teeth 5A that are the same as the tooth formation phase of the spline hole 4 (see Figures 3 and 4) and can mesh smoothly with the teeth of the spline hole 4. The tip guide tooth portion 5 can be aligned with the spline hole 4 and fitted smoothly. In other words, the tip guide tooth portion 5 of the spline shaft 1 can be easily inserted into the spline hole 4.

Also, the press-fit tooth portion 2 is formed with oblique teeth 2A having the same tooth formation phase as the tip guide tooth portion 5, and the press-fit tooth portion 2 is pushed in to mesh the oblique teeth 2A with the teeth of the spline hole 4. Then, oblique tooth 2A
Coupled with the fact that is slanted, the press-fit tooth portion 2 is press-fit into the spline hole 4. Incidentally, the degree of inclination of the oblique teeth 2A is about 0.03 mm relative to 25 mm, which is about 10 minutes in angle.

By the way, in order to make the spline shaft 1 having the tip guide tooth portion 5 and the press-fit tooth portion 2 using a rolling rack, a rolling rack 6 as shown in FIG. 6 is used.

This rolling rack 6 has a tip rolling rack member 5' for forming the tip guide tooth portion 5 and a rolling rack member 2' for press fitting teeth forming the press fitting tooth portion 2. A conventional rolling rack can be used for the parts other than the tooth rolling rack member 5'. That is, the rolling rack member 5' for the tip guide teeth is screwed to the end face of the rolling rack member 2' for press-fit teeth so that it is in the same phase as the tooth forming phase of the rolling rack member 2' for press-fit teeth. .

To manufacture the spline shaft 1 using this rolling rack 6, as shown in FIG.
The rod-shaped material 7 from which the spline shaft is to be made is crimped and the rolling rack 6 and roller 8 are rotated in the direction of the arrow. As a result, the material 7 also rotates in the direction of the arrow, and during this rotation the tooth profile of the rolling rack 6 changes to the material 7.
transcribed into. Thereafter, the boundary between the tip guide tooth portion 5 and the press-fit tooth portion 2 is ground to form a groove 1a, thereby producing the spline shaft 1 as shown in FIG.

To press fit the spline shaft 1 according to this embodiment into the spline hole 4 of the constant velocity joint 3, first, as shown in FIG. The tip guide tooth portion 5 is inserted into the spline hole 4 so that the peaks and valleys of the teeth are aligned with each other in correspondence with the hole 4. For this insertion, standard teeth 5A are formed on the tip guide tooth portion 5, so
It can also be easily done by hand.

After the tip guide tooth portion 5 is fitted into the spline hole 4 in this way, the spline shaft 1 is inserted into the spline hole 4 using the required press fitting equipment (press).
Push it further inside. As a result, the press-fit tooth portion 2 of the spline shaft 1 is press-fitted into the spline hole 4 as shown in FIG. 4.

In this way, when press-fitting the spline shaft 1 into the spline hole 4, the tip guide tooth portion 5 is first easily inserted into the spline hole 4, and then the press-fit tooth portion 2 is press-fitted. Press fitting into the spline hole 4 can be performed quickly and easily.

7 to 9 show a spline shaft structure as a second embodiment of the present invention. FIG. 7 is a side view thereof, FIG. 8 is an enlarged view of a portion of FIG. 7, and FIG. 7 is a side view showing a rolling rack for manufacturing a rolling rack, and in FIGS. 7 to 9, the same reference numerals as in FIGS. 1 to 6 indicate substantially the same parts.

This spline shaft is also manufactured using a rolling rack, but as shown in FIGS. )
and a press-fit tooth portion 21 formed adjacent to the tip guide tooth portion 5 with a groove 1a having a width of approximately 1 to 2 mm.

Here, this press-fit tooth portion 21 has thick teeth 2 which have the same tooth formation phase as the tip guide tooth portion 5 but whose tooth width is thicker than the standard teeth 5A of the tip guide tooth portion 5.
1A is formed, and when the press-fit tooth portion 21 is pushed in to make the thick tooth 21A mesh with the teeth of the spline hole 4, the press-fit tooth portion 21 is press-fitted into the spline hole 4.

By the way, in order to make the spline shaft 1 having the tip guide tooth portion 5 and the press-fit tooth portion 21 using a rolling rack, a rolling rack 61 as shown in FIG. 9 is used.

This rolling rack 61 includes a rolling rack member 5' for the tip guide tooth that forms the tip guide tooth portion 5, and a rolling rack member 21' for the press-fit tooth that forms the press-fit tooth portion 21.
It has The end guide tooth rolling rack member 5' is screwed to the end face of the press-fit tooth rolling rack member 21' so that the tooth forming phase is the same as that of the press-fit tooth rolling rack member 21'. .

In addition, in order to manufacture the spline shaft 1 using this rolling rack 61, as shown in FIG. The material 7 is crimped and the rolling rack 61 and roller 8 are rotated in the direction of the arrow. As a result, the material 7 also rotates in the direction of the arrow, and the tooth profile of the rolling rack 61 is transferred to the material 7 during this rotation. After that, the boundary between the tip guide tooth portion 5 and the press-fit tooth portion 21 is shaved to form the groove 1.
By making a, the spline shaft 1 as shown in FIG. 7 is manufactured.

When the spline shaft 1 according to the second embodiment is press-fitted into the spline hole 4 of the constant velocity joint 3, for example, it is carried out in the same manner as when the spline shaft 1 according to the first embodiment is press-fitted. .

In this way, also in the case of the second embodiment, when press-fitting the spline shaft 1 into the spline hole 4, the tip guide tooth portion 5 is first easily inserted into the spline hole 4, and then the press-fit tooth portion 21 is press-fitted. As a result, the operation of press-fitting the spline shaft 1 into the spline hole 4 can be performed quickly and easily.

In each of the above embodiments, the groove portion 1a does not have to have a square cross section, but may have a slightly constricted (diameter reduced) shape at the boundary between the tip guide tooth portion 5 and the press-fit tooth portion 2 or 21. A groove of any shape may be used.

Further, the rolling rack members 2' for press-fit teeth,
Instead of screwing to the end surface of the tip guide tooth rolling rack member 5', the tip rolling rack member 5' may be attached to the end surface of the press-fit tooth rolling rack member 2', 21' by other means (for example, welding). good.

[Effects of the invention] As detailed above, according to the spline shaft structure of the invention, the initial insertion work of the spline shaft into the spline hole is made very easy due to the presence of the tip guide tooth portion, and this makes the initial insertion work of the spline shaft into the spline hole very easy. There is an advantage that the press-fitting operation of the press-fitting tooth portion into the spline hole following the press-fitting portion can be performed quickly and easily.

[Brief explanation of the drawing]

Figures 1 to 6 show a spline shaft structure as a first embodiment of the present invention. Figure 1 is a side view thereof, Figure 2 is an enlarged view of a portion of Figure 1, and Figures 3 and 4 are both Figure 5 is a cross-sectional view to explain how to press-fit the spline shaft into the spline hole, Figure 5 is a schematic diagram to explain the method of manufacturing the spline shaft using a rolling rack, and Figure 6 is the spline shaft. It is a side view showing a rolling rack for manufacturing a shaft;
7 to 9 show a spline shaft structure as a second embodiment of the present invention, and FIG. 7 is a side view thereof;
Figure 8 is an enlarged view of Figure 7, Figure 9 is a side view showing a rolling rack for manufacturing this spline shaft, and Figure 10 is a conventional spline shaft that is press-fitted into a spline hole. It is a sectional view for explaining the point. DESCRIPTION OF SYMBOLS 1...Spline shaft, 1a...Groove portion, 2...Press-fit tooth portion, 2A...Beveled tooth, 2'...Rolled rack member for press-fit tooth, 3...Constant velocity joint, 4...Spline hole, 5 ...Tip guide tooth part, 5A...Standard tooth, 5'...Rolled rack member for tip guide tooth,
6...Rolling rack, 7...Material, 8...Roller,
21...Press-fit tooth part, 21A...Thick tooth, 21'...
...Rolled rack member for press-fit teeth, 61...Rolled rack.

Claims (1)

[Scope of utility model registration request] In a spline shaft manufactured using a rolling rack, there is a tip guide tooth portion that can align and fit into the spline hole, and a tip guide tooth portion that is adjacent to the tip guide tooth portion with the same tooth formation phase as the tip guide tooth portion. 1. A spline shaft structure comprising a press-fit tooth portion which is provided in the spline hole and is press-fitted into the spline hole.