JP2003130077A - Coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coupling capable of easily and precisely positioning a die when correcting (sizing) it. SOLUTION: The coupling is made of a sintered metal member in which axially extending spline grooves 3 are formed at every circumferentially equivalent distance on the inside peripheral face. A plurality of axial positioning grooves 5 are formed at every same pitch. A positioning groove 5 of the outside peripheral face of the coupling 1 is set to coinside with a protrusion on the inside peripheral face of the sizing hole of the die to relatively position the coupling 1 against the die. As the positioning groove on the outside peripheral face of the coupling 1 and the spline groove 3 on the inside peripheral face have mutually relative relation, by relatively positioning the coupling to the die through the positioning groove on the outside peripheral face, the spline axis is relatively positioned to the die and further, it is relatively positioned to the core rod having a relative positional relation to the die.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft coupling, and more particularly to a shaft coupling that connects both shafts by spline-engaging one shaft and press-fitting the other shaft.

[0002]

2. Description of the Related Art An example of this type of shaft coupling is shown in FIG. The shaft coupling 15 shown in FIG. 5 is, for example, the rotating shaft 11 of the motor M.
The rotational force of the (input shaft) is transmitted to the shaft 12 (output shaft) and is made of steel. The shaft coupling 15 has a tubular shape, and one shaft 11 is spline-engaged from one side in the axial direction and the other shaft 12 is press-fitted from the other side in the axial direction on the inner peripheral side. Axis 11
And the other shaft 12 are integrally connected.

In this case, the shaft coupling 15 comprises a cylindrical outer sleeve 16 and a cylindrical inner sleeve 19 which is press-fitted to the inner peripheral side of the outer sleeve 16, and the inner peripheral surface of the outer sleeve 16 is a spline hole. 17, the inner peripheral surface of the inner sleeve 19 is formed into a press-fitting hole 20 having a diameter smaller than that of the spline hole 17, and spline grooves 18 along the axial direction are formed on the inner peripheral surface of the spline hole 17 at equal intervals in the circumferential direction. A plurality of grooves are provided along the axial direction on the inner peripheral surface of the press-fitting hole 20 (not shown) at equal intervals in the circumferential direction.

Here, the shaft coupling 15 is composed of two parts, an outer sleeve 16 and an inner sleeve 19, when the spline groove 18 is formed on the inner peripheral surface side of the outer sleeve 16 by a broaching machine. This is because it is necessary to escape the brooch. That is, the inner peripheral surface of the outer sleeve 16 is formed in two steps of the large diameter portion 16a and the small diameter portion 16b, and the small diameter portion 16b is formed.
The large diameter portion 16a is used as a relief for the broach when processing the spline groove 3 on the inner peripheral surface with a broaching machine.

After the processing of the spline groove 18 is completed, the inner sleeve 19 having a plurality of grooves formed on its inner peripheral surface in advance is press-fitted into the large diameter portion 16a. Then, after that, in the spline hole 17, one shaft 1 in which a plurality of spline grooves along the axial direction are provided on the outer peripheral surface at equal intervals in the circumferential direction.
1 is spline-engaged and the other shaft 12 having a plurality of grooves along the outer circumferential surface along the axial direction provided at equal intervals in the circumferential direction is press-fitted into the press-fitting hole 20, whereby one shaft 11 and the other shaft 11 1
2 can be integrally connected.

[0006]

However, in the shaft coupling 15 having the above-mentioned structure, since the shaft coupling 15 is composed of two parts, the outer sleeve 16 and the inner sleeve 19,
The number of parts is large, it takes time to process, and the production efficiency is poor.

On the other hand, in order to solve the above problems, there has been proposed a shaft coupling integrally formed of a sintered metal material. In such a shaft coupling (not shown),
Since the number of parts can be reduced, processing can be facilitated. However, since positioning means for the mold is not provided at the time of straightening (sizing), it takes a lot of time and effort to perform positioning, and it is difficult to continuously insert the mold into the mold using a turntable or the like. When correcting, the dimensions of each part will be incorrect,
There are many cases in which the prescribed dimensional accuracy cannot be ensured.

The present invention has been made in view of the above problems and can reduce the number of parts,
In addition to facilitating processing, positioning can be performed easily and reliably with respect to the mold during straightening, and it is possible to continuously insert the mold into the mold using a turntable or the like. It is an object of the present invention to provide a shaft coupling in which the dimensions of each part do not change and the prescribed dimensional accuracy is obtained.

[0009]

In order to solve the above-mentioned problems, the present invention employs the following means. That is, the invention according to claim 1 has a tubular shape and
A shaft joint made of a sintered metal material, in which grooves along the axial direction on the inner peripheral surface are provided at predetermined intervals in the circumferential direction, and a plurality of positioning grooves along the axial direction are provided on the outer peripheral surface in the circumferential direction. It is characterized by that. According to the shaft coupling of the present invention, the shaft coupling is relatively positioned with respect to the mold (die) via the positioning groove on the outer peripheral surface during the correction. In this case, since the groove for positioning the outer peripheral surface of the shaft coupling and the groove for the inner peripheral surface have a correlation, the groove on the inner peripheral surface should be positioned relative to the die (die). Thus, it becomes possible to easily and surely position the mold (core rod) having a relative positional relationship with the mold (die) on the inner peripheral side of the shaft coupling.

The invention according to claim 2 is the shaft joint according to claim 1, characterized in that the positioning grooves are provided at equal intervals in the circumferential direction. According to the shaft joint of the present invention, since the positioning groove on the outer peripheral surface of the shaft joint and the groove on the inner peripheral surface have a correlative relationship with each other, the shaft joint is fixed to the mold (die) during the correction. By relatively positioning the groove via the positioning groove on the outer peripheral surface, the groove on the inner peripheral surface of the shaft coupling is also positioned relative to the mold (die), and the mold (die It is possible to easily and surely position the mold (core rod) having a relative positional relationship with (1) on the inner peripheral side of the shaft coupling.

The invention according to claim 3 is the shaft coupling according to claim 1 or 2, wherein the number of grooves on the outer peripheral surface is a divisor of the number of grooves on the inner peripheral surface. According to the shaft joint of the present invention, since the groove on the outer peripheral surface of the shaft joint and the groove on the inner peripheral surface have a correlative relationship, the shaft joint is mounted on the outer peripheral surface of the mold (die) during correction. Grooves on the inner peripheral surface of the shaft joint are also positioned by the relative positioning through the positioning grooves of
Therefore, the mold (core rod) having a relative positional relationship with the mold (die) can be easily and reliably positioned on the inner peripheral side of the shaft coupling. Become.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention shown in the drawings will be described below. 1 to 3 show an embodiment of a shaft coupling according to the present invention. FIG. 1 is a vertical sectional view showing the whole, FIG. 2 is a left side view of FIG. 1, and FIG. It is a right side view.

That is, the shaft coupling 1 is formed of a sintered metal material and has a cylindrical shape. The inner peripheral side of the shaft coupling 2 is a spline hole 2 and a press-fitting hole 4 having a diameter smaller than that of the spline hole 2.
The openings of the spline holes 2 and the press-fit holes 4 are chamfered at predetermined angles.

On the inner peripheral surface of the spline hole 2, a plurality of spline grooves 3 parallel to the axis of the shaft coupling 1 along the axial direction are provided at equal intervals in the circumferential direction, and the plurality of spline grooves 3 spline the splines. The inner peripheral surface of the hole 2 is formed so as to have continuous irregularities. The plurality of spline grooves 3 correspond to the shape of the outer peripheral surface of the core rod (not shown) of the mold used in powder molding.

On the inner peripheral surface of the press-fitting hole 4, a plurality of fine grooves 4a parallel to the axis of the shaft coupling 1 along the axial direction are provided at equal intervals in the circumferential direction, and the press-fitting holes are formed by the plurality of fine grooves. The inner peripheral surface of No. 4 is formed in a shape in which minute irregularities are continuous. The plurality of minute grooves correspond to the outer peripheral surface shape of the core rod (not shown) of the mold used in powder molding.

On the outer peripheral surface of the shaft coupling 1, a plurality of positioning grooves 5 parallel to the axis of the shaft coupling 1 along the axial direction are provided at equal intervals in the circumferential direction, and the plurality of positioning grooves are provided. 5, the outer peripheral surface of the shaft coupling 1 is formed in a shape in which unevenness is continuous. The positioning groove 5 may have a semicircular cross section, a triangular cross section, a rectangular cross section, or the like. The positioning grooves 5 are provided at equal intervals because the balance during rotation is taken into consideration. The positioning groove 5 corresponds to the shape of the inner peripheral surface of the molding hole (not shown) of the die of the mold used for powder molding.

The total number of positioning grooves 5 on the outer peripheral surface of the shaft coupling 1 is a divisor of the total number of spline grooves 3 on the inner peripheral surface of the shaft coupling 1. For example, when the total number of spline grooves 3 on the inner peripheral surface of the shaft coupling 1 is 16, the total number of positioning grooves 5 is set to 8. Therefore, the total number of spline grooves 3 is an even number. Therefore, since the positioning groove 5 on the outer peripheral surface of the shaft coupling 1 and the spline groove 3 on the inner peripheral surface have a correlative relationship with each other, it can be used for a die (die, core rod, etc.) used for correction (sizing) described later. On the other hand, by relatively positioning the shaft coupling 1 via the positioning groove 5 on the outer peripheral surface, the spline groove 3 on the inner peripheral surface is also positioned relatively to the mold (die, core rod, etc.). It will be.

The shaft coupling 1 having the above-mentioned structure is
It is formed into a predetermined shape and size through powder molding, sintering, and straightening (sizing).

That is, a die (die, core rod, upper punch, lower punch, etc.) is mounted on a press machine, a powdered sintered metal material is filled in the die cavity of the die, and compression molding is carried out. The shaft coupling 1 which is a molded product conforming to the desired shape is molded.

Then, the molded product is taken out of the mold, placed in a sintering furnace, and heated and sintered in a protective atmosphere to form the shaft coupling 1 which is a sintered product having a predetermined shape. .

Then, as shown in FIG. 4, the shaft joint 1 which is a sintered product is put into the straightening hole 7 of the die 6 of the straightening die. In this case, the shaft couplings 1 may be introduced one by one,
It may be continuously charged using a turntable.

Then, the positioning groove 5 on the outer peripheral surface of the shaft coupling 1 and the projection (not shown) previously provided on the inner peripheral surface of the correction hole 7 of the die 6 are matched with each other, so that the shaft coupling 1 is attached to the die 6 The shaft joint 1 is positioned relative to the die 6 while being fixed in the correction hole 7, and the spline groove 3 on the inner peripheral surface of the shaft joint 1 is positioned relative to the die 6.

In this case, since the positioning groove 5 on the outer peripheral surface of the shaft coupling 1 and the spline groove 3 on the inner peripheral surface have a correlation, the spline groove 3 on the inner peripheral surface of the shaft coupling 1 is formed on the die 6. They will be positioned relative to each other.

Further, since the die 6 of the straightening die and the core rod 8 are preliminarily positioned relative to each other, the spline groove 3 on the inner peripheral surface of the shaft coupling 1 is positioned relative to the die 6, and The core rod 8 is also positioned relatively.

Then, in this state, the core rod 8 is inserted into the inner peripheral side of the shaft coupling 1, and the spline groove 3 on the inner peripheral surface of the shaft coupling 1 is inserted.
And a protrusion (not shown) provided in advance on the outer peripheral surface of the core rod 8 are matched with each other, and in this state, the shaft coupling 1 is compressed between the upper punch 9 and the lower punch 10 of the straightening mold to apply pressure. The shaft coupling 1 is straightened (sizing), and after the straightening is completed, the straightening mold is opened and the shaft coupling 1 is taken out. In this way, the shaft coupling 1 having a predetermined shape and dimensional accuracy
Is obtained.

In the shaft coupling 1 according to this embodiment configured as described above, since the whole is integrally formed by using the sintered metal material, the number of parts can be reduced and the processing is easy. Become.

Further, by providing the positioning groove 5 on the outer peripheral surface of the shaft coupling 1 and by correlating the positioning groove 5 with the spline shaft 3 on the inner peripheral surface, the outer periphery of the shaft coupling 1 can be obtained. By aligning the groove 5 for positioning the surface with the protrusion on the inner peripheral surface of the correction hole 7 of the die 6 and positioning the shaft coupling 1 relative to the die 6, the spline groove on the inner peripheral side of the shaft coupling 1 is formed. 3 will also be positioned relative to the die 6. In this case, since the die 6 and the core rod 8 are relatively positioned in advance, the vinegar plan groove 3 on the inner peripheral side of the shaft coupling 1 is also positioned relatively to the core rod 8. Therefore, when the core rod 8 is brought relatively close to the die 6 and the projection on the outer peripheral surface of the core rod 8 is engaged with the spline groove 3 on the inner peripheral surface of the shaft coupling 1, both can be engaged smoothly. Therefore, the engagement between the two becomes easy and reliable, and the spline groove 3 on the side of the shaft coupling 1 is not damaged or damaged when the both are engaged.

Further, the outer peripheral side of the shaft coupling 1 is fixed to the die 6 side through a positioning groove, and the inner peripheral side thereof is splined with a groove 3.
The shaft coupling 1 is fixed to the core rod 8 side via the core punch 8, and the shaft coupling 1 is vertically compressed between the upper punch 9 and the lower punch 10 and the heat treatment is applied to the shaft coupling 1 in this state. Even if there is a difference in the amount of deformation of each portion of the shaft coupling 1 due to a thick portion and a thin portion of the shaft coupling 1, the dimensions of the respective portions of the shaft coupling 1 do not change, and the shaft coupling with a predetermined accuracy is obtained. 1 will be obtained.

[0029]

As described above, according to the shaft coupling of the present invention, since the whole is integrally formed by using the sintered metal material, the number of parts is reduced and the machining is easy. Becomes In addition, since the positioning groove provided on the outer peripheral surface of the shaft coupling and the groove on the inner peripheral surface have a correlation, the shaft coupling can be molded through the groove for positioning the outer peripheral surface during correction. By positioning relative to the (die), the groove on the inner peripheral surface is also positioned relative to the mold (die), and the metal is in a relative positional relationship with the mold (die). It is also positioned relative to the mold (core rod). Therefore, the relative positioning of the shaft joint with respect to the mold becomes easy and reliable during the straightening, so that the groove on the inner peripheral side of the shaft joint is scratched or damaged when the mold is clamped. Things like that will disappear. Further, even when the turntable is used to continuously insert the shaft coupling into the mold, the positioning of the shaft coupling with respect to the mold can be performed easily and reliably, so that the productivity can be significantly increased. Become. Further, the groove on the outer peripheral side of the shaft coupling is fixed to the die (die) side, the groove on the inner peripheral side is fixed to the die (core rod) side, and heat treatment of the shaft coupling is performed in this state. Even if there is a difference in the amount of deformation of each part due to the thick part and the thin part of the shaft coupling, the dimensions of each part will not be misaligned, and a shaft coupling with a predetermined accuracy can be obtained. become.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a shaft coupling according to the present invention.

FIG. 2 is a left side view of FIG.

FIG. 3 is a right side view of FIG. 1.

FIG. 4 is a schematic cross-sectional view showing the relationship between the shaft coupling and the straightening die according to the present invention.

FIG. 5 is a vertical sectional view showing an example of a conventional shaft coupling.

[Explanation of symbols]

1 shaft coupling 3 spline groove 5 Positioning groove

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toshiro Harakawa             3-1-1 Koganecho, Niigata City, Niigata Prefecture Mitsubishi             Niigata Works, Material Co., Ltd.

Claims (3)

[Claims] 1. A shaft coupling made of a sintered metal material, which is cylindrical and has axial grooves formed on the inner peripheral surface thereof at predetermined intervals in the circumferential direction, the axial joint being formed on the outer peripheral surface in the axial direction. A shaft coupling characterized in that a plurality of positioning grooves are provided in the circumferential direction. 2. The shaft joint according to claim 1, wherein the positioning grooves are provided at equal intervals in the circumferential direction. 3. The shaft coupling according to claim 1, wherein
The shaft coupling, wherein the number of grooves on the outer peripheral surface is a divisor of the number of grooves on the inner peripheral surface.