JP2001246441A - Method of manufacturing spline piece gear - Google Patents

Abstract

(57) Abstract: To provide a method of manufacturing a spline piece gear with low manufacturing cost. A method for manufacturing a spline piece gear from a metal plate by press working. That is, a press-drawing step of forming a disk-shaped metal plate into a dish-like shape having a conical central side portion by press-drawing, and a chamfer 6 extending radially on one surface of a peripheral edge 40 surrounding the dish-like shape.
0, a spline portion forming step of punching out the distal end of the peripheral portion 40 including the chamfer 60 to form a spline portion having the chamfer 60 at the peripheral end portion, and a shaft hole portion punching out a dish-shaped bottom. 50. A method of manufacturing a spline piece gear, comprising: The spline piece gear can be manufactured without including steps other than press working such as cutting, and the manufacturing cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method for manufacturing a spline piece gear. The spline piece gear is mainly used for a synchromesh mechanism of an automobile and the like.

[0002]

2. Description of the Related Art Spline piece gears are used for synchromesh mechanisms and the like in automobile transmissions. This spline piece gear is used together with a sleeve and the like in a synchromesh mechanism of an automobile.

The spline piece gear will be described with reference to FIG. 13 which schematically shows a spline piece gear.
The spline piece gear 100 has a so-called shaft hole portion 130 and a flange 120 surrounding the shaft hole portion 130 and having a spline portion 110 formed at a peripheral end portion. The shaft hole portion 130 has a cylindrical shape, and has a cone shape in which the diameter of the shaft hole portion 130 is reduced from one end side formed integrally with the flange 120 toward the other end side, that is, the distal end direction. It has a side circumference. The flange 120 is formed integrally with the shaft hole 130 so as to surround the shaft hole 130. Further, a spline portion 110 composed of teeth, that is, spline teeth is formed on the entire peripheral end of the flange 120.

The synchromesh mechanism of an automobile is a mechanism for synchronizing a spline piece gear 100 and a sleeve. In this case, the synchronization between the spline piece gear 100 and the sleeve is performed by engaging the spline portion 110 of the spline piece gear with the spline portion formed on the inner periphery of the sleeve. FIG. 14 schematically shows this fitted state.

As shown in FIG. 14, the spline portion 150 of the sleeve enters the gap of the spline portion 110 of the spline piece gear 100, and the sleeve and the spline piece gear 100 are synchronized. Therefore, the teeth forming the spline portion 110 of the spline piece gear are opposed to the sleeve as shown in FIG. 14 so that the spline portion 150 of the mating sleeve can easily enter the gap of the spline portion 110 of the spline piece gear. A chamfer 110a is formed on the surface.

As described above, the spline portion 150 of the sleeve is used.
And the spline portion 110 of the spline piece gear in order to synchronize and mesh with each other.
It is necessary that a sink runner ring or the like can be pressed against the 0 shaft hole portion 130. Therefore, the shaft hole 130
As described above, the diameter of the shaft hole decreases as it advances toward the tip, and the side peripheral portion of the shaft hole 130 has a cone shape.

As shown in FIG. 14, the spline portion 110 of the spline piece gear 100 is formed so that the fitted sleeve and the spline piece gear do not easily come off.
Spline part 1 of spline piece gear 100 fitted with spline part 150 of the sleeve of spline part 110
The ten fitting surfaces 110b may have a reverse tapered shape. That is, the chamfer 110a of the spline section 110
The spline portion 110 may be provided with a reverse tapered shape in which the tooth width becomes narrower as going from the surface on which the surface is formed to the opposite surface. Further, although not shown, the spline piece gear 100 may have internal teeth on the inner peripheral surface of the shaft hole 130.

In any case, the spline piece gear 10
Since O has such a complicated shape, it has been conventionally manufactured by combining a plurality of steps. For example, it has been manufactured by a plurality of processes in which different types of processing methods such as forging, which is a type of plastic processing, and gear cutting, which is a type of mechanical processing, are combined. Different types of processing methods have been used for forming the shaft hole and forming the spline. Therefore, it has been necessary to adjust the work process between each process. Therefore, it has been difficult to reduce the manufacturing cost.

[0009]

However, spline piece gears are widely used in synchromesh mechanisms for automobiles. Therefore, there is still a need to reduce the manufacturing cost. On the other hand, it is difficult to further reduce the manufacturing cost in the conventional manufacturing method that combines a plurality of different processing methods such as forging and gear cutting.

An object of the present invention is to provide a method of manufacturing a spline piece gear with low manufacturing cost.

[0011]

SUMMARY OF THE INVENTION The inventor of the present invention can reduce the manufacturing cost if spline piece gears can be manufactured consistently by the same type of processing method instead of different processing methods. I thought there was. As a result of research, the present inventor considered that if the spline piece gear could be manufactured from a metal plate by press working, the manufacturing cost could be dramatically reduced.

The inventor of the present invention has made intensive studies and found that the inner peripheral surface or the outer peripheral surface has a cone-shaped tapered surface from one end to the other end, and is integrally formed at one end of the shaft hole. A method of manufacturing a spline piece gear having a flange formed with a spline portion at a peripheral end thereof, the press forming a disc-shaped metal plate by press drawing to form a central portion into a dish shape with a side peripheral portion having a cone shape. A squeezing step, a chamfer forming step of forming a chamfer extending in a radial direction on one surface of a peripheral portion surrounding the dish shape, and punching out a distal end of a peripheral portion including the obtained chamfer, and having a chamfer at a peripheral end portion. A spline portion forming step of forming a spline portion, and a shaft hole portion forming the shaft hole portion by punching the dish-shaped bottom after the press drawing step, the chamfer forming step or the spline portion forming step. Invented a method for manufacturing the spline piece gear, characterized in that a step.

The method of manufacturing a spline piece gear according to the present invention is a method of manufacturing a spline piece gear having a press drawing step, a chamfer forming step, a spline portion forming step, and a shaft hole forming step. With this manufacturing method,
A spline piece gear can be manufactured from a disk-shaped metal plate.

In the method of manufacturing a spline piece gear according to the present invention, all of the press drawing step, the chamfer forming step, the spline portion forming step, and the shaft hole forming step can be performed by press working using a press machine. As a result, according to the method for manufacturing a spline piece gear of the present invention, a spline piece gear can be manufactured from one disk-shaped metal plate by press working. That is, the spline piece gear can be manufactured by press working without including steps other than press working such as cutting as conventionally performed. . Therefore, the adjustment of the work between the respective steps is facilitated, the manufacturing cost can be reduced, and the work time can be shortened.

Here, after the shaft hole forming step, a reverse taper forming step of forming a reverse taper on the surface of the spline portion opposite to the surface on which the chamfer is formed may be included. Further, before the press drawing step, a disk-shaped metal plate forming step of punching a metal plate to form a disk-shaped metal plate may be included.

As described above, by including the reverse taper forming step, a spline piece gear in which the fitting surface of the spline portion has a reverse taper shape can be manufactured by press working. In addition, by including a disk-shaped metal plate forming step before the press drawing step, a spline piece gear can be manufactured from one metal plate by press working. Here, the pressing means that a part or the whole of the plate material is mainly plastically deformed by a press machine.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for manufacturing a spline piece gear according to the present invention will be described below in detail.

According to the method for manufacturing a spline piece gear of the present invention, a shaft hole having an outer peripheral surface that forms a cone-shaped tapered surface from one end to the other end is formed integrally with one end of the shaft hole. A spline piece gear having a spline portion and a flange having a spline portion, wherein a chamfer is formed in the spline portion.

That is, the spline piece gear has a shaft hole having an outer peripheral surface that is a cone-shaped tapered surface from one end to the other end, and a spline portion formed integrally with one end of the shaft hole. And a flange having a flange. In other words, the spline piece gear has a shaft hole and a flange having a spline. The shaft hole has a cylindrical shape, and has a cone-shaped taper surface in which the diameter of the inner peripheral surface or the outer peripheral surface is reduced from the flange side toward the front end, that is, the other end side. The flange is integrally formed so as to surround the shaft hole, and a spline is formed at a peripheral end thereof, and the spline has a chamfer.

As described above, this spline piece gear can be mainly used in a synchromesh mechanism in a transmission of an automobile or the like. In this synchromesh mechanism, the spline piece gear meshes with the sleeve and is used as a synchronized gear.

The method for manufacturing a spline piece gear according to the present invention includes a press drawing step, a chamfer forming step, a spline part forming step, and a shaft hole part forming step. This shaft hole forming step can be performed either after the press drawing step, after the chamfer forming step, or after the spline part forming step.

Before the press drawing step, a disk-shaped metal plate forming step of punching a metal plate to form a disk-shaped metal plate can be included. Further, after the spline forming step, a reverse taper forming step of forming a fitting surface of the spline portion into a reverse taper shape by forging can be included.

It should be noted that the present invention can be applied to a method of manufacturing a spline piece gear having the above-described press drawing step, chamfer forming step, spline section forming step, and shaft hole section forming step, even if steps other than the above steps are included. It belongs to a method of manufacturing a spline piece gear.

Further, if a spline piece gear is manufactured by the method of manufacturing a splice piece gear having the press drawing step, the chamfer forming step, the spline portion forming step, and the shaft hole forming step, for example, as described in the embodiment, Manufacturing a spline piece gear in which internal teeth are formed on the inner peripheral surface of the shaft hole is also included in the method for manufacturing a spline piece gear of the present invention.

The press drawing step is a step of forming a disk-shaped metal plate into a dish shape by pressing the central portion of the disk-shaped metal plate into a conical peripheral portion.

The method for producing the disk-shaped metal plate is not particularly limited. What is necessary is just to manufacture by the method usually used. In this case, it is preferable to produce a disc-shaped metal plate by punching a metal plate by press working. That is, it is preferable to have a disk-shaped metal plate forming step. If a disk-shaped metal plate is manufactured by punching out a metal plate by pressing in this way, it is possible to manufacture a spline piece gear from a metal plate in a process by pressing. In addition, it is easy to adjust the work between the steps, and the manufacturing cost can be reduced.

The disk-shaped metal plate may be of an appropriate size in consideration of the size of the spline piece gear to be manufactured. At least a disk-shaped metal plate having an outer diameter larger than the outer diameter of the spline portion formed at the peripheral end of the flange of the spline piece gear after manufacture is used. The thickness of the disk-shaped metal plate may be selected in consideration of the strength of the metal material. Generally, the thickness may be approximately 4 to 10 cm, preferably 6 to 8 cm. Further, an appropriate metal material can be selected in consideration of the strength and the like. For example, SCM, SCr, SPH, S
A PC or the like can be used. However, it is not limited to these materials.

In this press-drawing step, a disk-shaped metal plate is repeatedly subjected to press-drawing, thereby forming a dish with a cone-shaped side periphery at the center of the disk-shaped metal plate. This press drawing step can be performed by a usual method. That is, it can be performed using a punch and a die. Here, it is preferable to apply a predetermined wrinkle holding force as needed.

In this press drawing step, an intermediate formed body having a bottomed cone-shaped dish shape at the center and a flat peripheral portion surrounding the dish shape is formed from a disc-shaped metal plate.

The cone-shaped dish located at the center is
It is a shape formed by protruding the central part of a disk-shaped metal plate, in other words, it can be said to be a cylindrical shape in which the outer diameter is reduced toward the tip. At this stage, the cone-shaped dish has a bottom at its tip. The cone-shaped dish shape is a protruding portion formed by squeezing a disk-shaped metal plate, and thus the protruding tip portion has a bottom portion, in other words, a lid portion. The dish-shaped height may be set to an appropriate height in consideration of the size, strength, and the like of the disc-shaped metal plate.

A flat peripheral portion is formed around the cone-shaped dish shape. Since the cone-shaped dish shape is formed by projecting the central portion of the metal plate, the portion that is not projected forms a flat peripheral portion surrounding the cone-shaped dish shape. Therefore, the outer periphery of this flat peripheral portion has a circular shape. It should be noted that the peripheral portion may be appropriately sized in consideration of the fact that chamfer is formed in the chamfer forming step and punching is performed in the spline portion forming step.

In the method of manufacturing a spline piece gear of the present invention, a chamfer forming step is performed after the above-described press drawing step. However, the shaft hole forming step may be performed before this chamfer forming step. The shaft hole forming step can be appropriately performed after the press drawing step, after the chamfer forming step, after the spline part forming step, or the like, so that the detailed description of the shaft hole forming step will be described later. I will do it.

The chamfer forming step is a step of forming a chamfer extending in the radial direction on one surface of the peripheral portion surrounding the dish shape. The formation of the chamfer can be performed by a usual method. That is, the pressing can be performed by pressing the portion where the chamfer is formed using a press machine. That is, it can be formed using a mold having a shape corresponding to the shape of the chamfer.

Here, the chamfer consists of peaks and valleys extending in the radial direction. The number of peaks of the chamfer may be equal to the number of teeth of the spline portion of the spline piece gear to be manufactured. This is because it is necessary to form a chamfer, that is, a convex shape for each tooth of the spline portion.

The portion where the chamfer is formed is a flat peripheral portion surrounding the cone-shaped dish shape, and is the surface on the side where the cone-shaped dish shape protrudes. This chamfer must be left in the spline portion after molding, and the chamfer must be formed in a portion where the spline portion is to be formed. It is formed with a predetermined width in the radial direction so as to include at least this portion. This chamfer is formed so as to surround the dish shape in a so-called ring shape. The width of the chamfer formed in this way can be determined in consideration of the length of the spline portion after manufacturing.

In the method of manufacturing a spline piece gear according to the present invention, the press drawing step and the chamfer forming step can be performed in parallel or continuously without being separate steps. As described above, by performing the press drawing step and the chamfer forming step in parallel, the working steps can be simplified accordingly. As a result, manufacturing costs can be reduced,
Also, the manufacturing time can be reduced.

In this case, while pressing the portion of the peripheral portion where the chamfer is formed by a press having a mold corresponding to the shape of the chamfer, a central portion of the disk-shaped metal plate is press-drawn to form a cone-shaped dish shape. It may be formed. By pressing the peripheral portion of the disk-shaped metal plate by pressing, the disk-shaped metal plate can be fixed, and the press drawing can be performed stably.

The spline section forming step is a step of forming a spline section having a chamfer at the peripheral end by punching out the centrifugal end of the peripheral section including the chamfer. That is, this is a step of punching out the centrifugal end of the peripheral part of the intermediate molded product obtained in the press drawing step and the chamfer forming step to form a spline part at the peripheral end.

In order to punch out the centrifugal end of the peripheral part and form a spline part in the peripheral part, a punch and a die are used.
What is necessary is just to pull out the centrifugal end of the peripheral part in a gear shape. At this time, since the spline portion requires accuracy, it is preferable to provide a guide punch or the like so that the clearance between the die and the punch is small and the vertical alignment is determined.

In this case, the distal end of the punched peripheral portion is
This is where the chamfer is formed. Therefore, the spline portion formed by this spline portion forming step has a chamfer.

In the case of performing the punching, it is preferable to perform the punching so that the valley portion of the chamfer formed in the peripheral portion becomes the tooth groove of the spline portion. However, it is not necessary to perform the punching so that the deepest point of the valley becomes the center of the tooth space, and the shape of the peak and the valley of the chamfer after molding may be determined according to the characteristics of the portion where the spline piece gear is used.

By performing the punching in this manner, the peripheral edge forms a flange having a spline portion at the peripheral end.

The shaft hole forming step is a step of punching a dish-shaped bottom to form a shaft hole.

This shaft hole forming step is performed after the spline part forming step, the chamfer forming step or the spline part forming step.

The cone-shaped dish-shaped bottom can be punched by a usual method, that is, by using a punch. By punching out the cone-shaped dish-shaped bottom in this way, the dish-shaped portion forms a shaft hole.

Preferably, after the spline portion forming step, a reverse taper forming step of forming a fitting surface of the spline portion into a reverse taper shape by forging is included. That is, it is preferable to reduce the tooth width of the spline portion from the side having the chamfer to the opposite side. In this case, the reverse tapered shape can be formed by forging in which the metal plate on which the spline portion is formed is pressed into a die having a shape corresponding to the reverse tapered shape.

In the spline piece gear, the spline portion is fitted with the spline portion of the sleeve, so that the sleeve and the spline piece gear are synchronized. In this case, the fitting surface of the spline portion of the spline piece gear is as described above. If it has a reverse taper shape, the spline portions are less likely to come off.

The method for manufacturing a spline piece gear according to the present invention may have other steps besides the above. That is, as described in the embodiment, a step of increasing the thickness of the dish-shaped portion,
The method may include a step of providing a step on the flange, a step of correcting a shaft hole, and a step of forming internal teeth on the inner surface of the shaft hole.

[0049]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a spline piece gear manufacturing method according to an embodiment of the present invention;

First, as a disk-shaped metal plate forming step, FIG.
As shown in (1), one metal plate 10 was prepared and punched out with a press machine to form a plurality of disk-shaped metal plates 20. In this case, as many disk-shaped metal plates 20 as possible
It was punched out so as to be able to pass through. FIG. 2 shows the shape of the disc-shaped metal plate 20 punched out. FIG. 2A is a front sectional view, and FIG. 2B is a plan view. 3 to 13 in the following description, (A) is a front sectional view, and (B) is a plan view.

Next, in the press drawing step, as shown in FIGS. 3, 4 and 5, the disc-shaped metal plate 20 obtained in the above-mentioned disc-shaped metal plate forming step is press-drawn to reduce the center thereof. The side periphery was formed in a cone-shaped dish shape 30. The press drawing was repeatedly performed to gradually form a cone-shaped dish shape 30 at the center of the metal plate. In other words, the cone-shaped dish shape 30 can be said to be a bottomed (covered) cylindrical shape that is slightly conical in diameter and protrudes while approaching the center of the metal plate. A flat peripheral portion 40 is formed on the peripheral edge of the cone-shaped dish shape 30 so as to surround the same.

That is, the intermediate molded product at the stage when the press drawing step is completed is composed of a cone-shaped dish shape 30 having a side peripheral portion and a flat peripheral portion 40 surrounding the cone-shaped dish shape 30 below the cone shape. Become. The flat peripheral portion 40 has an outer periphery forming a circumference.

In this example, the intermediate molded product obtained by a series of press drawing steps, that is, the intermediate molded product shown in FIG. 5 was increased in thickness. Fig. 6
As indicated by Y, the inner peripheral surface of the cone-shaped dish shape 30 is a portion that is connected to the cone-shaped dish shape 30 and the peripheral edge portion 40. This portion was thickened by press forging from the inside.

By increasing the wall thickness in this manner, the spline piece gear manufactured in this embodiment can form spline teeth as internal teeth also in the shaft hole.

In this embodiment, the wall thickness was increased as described above. However, even if such a thickening step is not provided, the method for manufacturing a spline piece gear of the present invention is included as long as the method for manufacturing a spline piece gear described in claim 1 is implemented.

Next, in this embodiment, as shown in Y of FIG.
A step was provided on the opposite surface of the 0 surface, that is, on the other surface. At this stage, a step 40a was previously formed on the other surface of the flat peripheral portion 40 surrounding the dish shape 30 so that the flange and the shaft hole had a step in the completed spline piece gear.
As shown by Y in FIG. 7, the step 40 a is formed by forming the surface forming the side peripheral portion of the cone-shaped dish shape 30 into the peripheral portion 40 in order to clarify the boundary between the completed shaft hole portion and the flange. If it is assumed that the outer surface extends in the direction of the other surface, a step 40 is formed in a circumferential portion formed by the intersection of the other surface of the peripheral portion 40 and the extended surface.
a was formed.

In this embodiment, the step is formed by pressing using a press machine.

In the method for manufacturing a spline piece gear, the method for manufacturing a spline piece gear according to the present invention is included in the method for manufacturing a spline piece gear according to the first aspect of the present invention without performing the step of forming a step described above. It is.

Next, in this embodiment, as shown in FIG. 8, the bottom of the cone-shaped dish shape 30 was punched out to form the shaft hole 50. That is, the bottom of the cone-shaped dish shape 30 was punched out to form an opening, that is, a hole, and the shaft hole 50a was provided in this opening. The cone-shaped dish-shaped portion 30 is a portion that forms the shaft hole 50 in the completed spline piece gear, and this hole becomes the shaft hole 50 a of the shaft hole 50. The punching or drilling was performed by a conventional method using a punch and a die.

In this embodiment, the inner peripheral surface of the shaft hole 50 was corrected as shown in FIG. This is to improve the accuracy of the later forming of the internal teeth. The straightening of the inner peripheral surface of the shaft hole 50 is performed by a burnishing method (b
urnishing) was used.

In the manufacture of the spline piece gear, the spline piece according to the present invention can be used as long as the manufacturing method of claim 1 is carried out, without performing the step of correcting the inner peripheral surface of the shaft hole 50 described above. Included in the gear manufacturing method.

Next, as a chamfer forming step, as shown in FIG. 10, a chamfer 60 extending in the radial direction is formed on one surface of the peripheral portion 40 surrounding the shaft hole 50 so as to surround the shaft hole 50. The surface of the peripheral portion 40 where the chamfer 60 is formed is the surface on the side where the shaft hole 50 protrudes. The chamfer 60 is provided so that the surface of the tooth on the shaft hole 50 side has the chamfer 60 in a spline portion formed in the spline piece gear after molding. In other words, the surface of the tooth forming the spline portion has a convex shape on the side of the shaft hole 50, in other words, the surface of the tooth on the side of the shaft hole 50 has the highest height approximately at the center.

That is, the spline piece gear is used for the synchromesh mechanism. In this case, the spline portion of the spline piece gear meshes with the spline portion of the counterpart sleeve. Therefore, in the spline portion of the spline piece gear, the surface of the spline tooth that faces the spline portion of the counterpart sleeve needs to have a chamfer to facilitate engagement.

The formation of the chamfer 60 was performed by a usual method. That is, the portion where the chamfer 60 is formed is pressed by a press machine. The portion forming the chamfer 60 is a portion where the spline portion is formed in the completed spline piece gear. In this case, the chamfer 60 was formed such that the number of peaks of the chamfer 60 was equal to the number of teeth of the spline portion to be formed.

Next, in this embodiment, as shown in FIG. 11, the internal teeth 51 are formed on the inner peripheral surface of the shaft hole 50. The formation of the internal teeth 51 on the inner peripheral surface of the shaft hole 50 was performed by penetrating a tooth-shaped punch through the inner diameter. At this time, the mold structure was such that the concentricity of the spline portion and the internal teeth was determined.

In the manufacture of the spline piece gear, the internal teeth 5 with respect to the inner peripheral surface of the shaft hole 50 described here are used.
1 is included in the method of manufacturing a spline piece gear of the present invention as long as the manufacturing method of claim 1 is performed.

Next, as a spline portion forming step, FIG.
As shown in (1), the centrifugal end of the peripheral portion 40 including the chamfer 60 obtained in the above-described process was punched out to form a flange 80 and a spline portion 70 having the chamfer 60 at the peripheral end. By forming the spline portion 70 and the flange 80 having the spline portion 70 at the peripheral end, the spline piece gear 90 is manufactured.

This punching was performed by a usual method using a press punching die composed of a punch and a die. This press punching die has a die corresponding to the shape of the teeth of the spline portion 70 so that the spline portion 70 formed at the peripheral end of the flange 80 can be formed.

When punching the distal end of the peripheral portion 40, the valley portion of the chamfer 60 formed in the peripheral portion 40 was punched. By punching out the valley portion of the chamfer 60 formed in the peripheral edge portion 40 in this manner, the peak portion of the chamfer remains on the surface of the spline portion 70 formed in the peripheral end portion on the shaft hole portion 50 side. Nari, Chanfa 6
A spline portion 70 having zero can be formed.

However, in the present embodiment, after this spline forming step, a reverse taper forming step of forming a fitting surface of the spline portion 70 into a reverse taper shape by forging is performed.
By forming the fitting surface of the spline portion 70 into an inversely tapered shape in this manner, it becomes difficult for the sleeve to come off when fitted to the sleeve.

The formation of the inverted tapered shape is achieved by the spline portion 7.
This was performed by pressing the spline piece gear 90 manufactured in the above-described process into a mold corresponding to the shape of the reverse taper formed at 0, and applying pressure.

[0072]

According to the method for manufacturing a spline piece gear of the present invention, a spline piece gear can be manufactured from one disk-shaped metal plate by press working using a press machine. Therefore, the adjustment of the work between the respective steps is facilitated, the manufacturing cost can be reduced, and the work time can be shortened.

By including the reverse taper forming step, a spline piece gear having a spline portion with a reverse tapered fitting surface can be manufactured by press working. In addition, by including a disk-shaped metal plate forming step before the press drawing step, a spline piece gear can be manufactured from a single metal plate by pressing.

[Brief description of the drawings]

FIG. 1 is a view showing an arrangement of a disk-shaped metal plate punched from one metal plate.

FIG. 2 is a view showing a stamped disk-shaped metal plate. (A) is a front sectional view, and (B) is a plan view. The cross section of (A) is the surface indicated by X in (B).

FIG. 3 is a diagram showing an intermediate molded product in an initial stage of a press drawing process. (A) is a front sectional view,
(B) is a plan view. The cross section of (A) is the surface indicated by X in (B).

FIG. 4 is a view showing an intermediate molded product at an intermediate stage of a press drawing process. (A) is a front sectional view,
(B) is a plan view. The cross section of (A) is the surface indicated by X in (B).

FIG. 5 is a view showing an intermediate molded product in a final stage of a press drawing process. (A) is a front sectional view,
(B) is a plan view. The cross section of (A) is the surface indicated by X in (B).

FIG. 6 is a view showing an intermediate molded product subjected to a thickening.
(A) is a front sectional view, and (B) is a plan view.
The cross section of (A) is the surface indicated by X in (B).

FIG. 7 is a view showing an intermediate molded product in which a step is formed on a flange. (A) is a front sectional view, and (B) is a plan view. The cross section of (A) is the surface indicated by X in (B).

FIG. 8 is a view showing an intermediate molded product obtained by punching a dish-shaped bottom. (A) is a front sectional view, and (B) is a plan view. The cross section of (A) is the surface indicated by X in (B).

FIG. 9 is a view showing an intermediate molded product in which the inner peripheral surface of the shaft hole of the shaft hole is corrected. (A) is a front sectional view, (B)
Is a plan view. The cross section of (A) is the surface indicated by X in (B).

FIG. 10 is a view showing an intermediate molded product in which a chamfer is formed on a peripheral portion. (A) is a front sectional view, (B)
Is a plan view. The cross section of (A) is the surface indicated by X in (B).

FIG. 11 is a view showing an intermediate molded product in which internal teeth are provided on the inner peripheral surface of the shaft hole. (A) is a front sectional view, (B)
Is a plan view. The cross section of (A) is the surface indicated by X in (B).

FIG. 12 is a diagram showing a spline piece gear in which a spline portion is formed by punching a distal end of a peripheral portion.
(A) is a front sectional view, and (B) is a plan view.
The cross section of (A) is the surface indicated by X in (B).

FIG. 13 is a view schematically showing a spline piece gear.

FIG. 14 is a diagram schematically showing a state in which a spline portion of a spline piece gear and a spline portion of a sleeve are fitted.

[Explanation of symbols]

 10: metal plate 20: disk-shaped metal plate 30: dish shape 40: peripheral portion 40a: step 50: shaft hole 50a: shaft hole 60: chamfer 70: spline portion 80: flange 90: spline piece gear 100 : Spline piece gear 110: spline section 110 a: chamfer 110 b: fitting surface 120: flange 130: shaft hole section 150: spline section of sleeve

Claims (3)

[Claims] 1. A shaft hole having an outer peripheral surface having a cone-shaped tapered surface from one end to the other end, and a flange integrally formed on one end of the shaft hole and having a spline portion at a peripheral end. A method for manufacturing a spline piece gear having a press-drawing step of forming a disk-shaped metal plate into a dish shape with a side peripheral portion formed into a cone-like shape by press-drawing, and forming a peripheral portion surrounding the dish shape. A chamfer forming step of forming a chamfer extending in a radial direction on one surface; and a spline part forming step of punching out a centrifugal end of a peripheral part including the obtained chamfer and forming the spline part having a chamfer at a peripheral end part; A splicing step of punching the dish-shaped bottom and forming the shaft hole after the press drawing step, the chamfer forming step or the spline part forming step. Method of manufacturing a Pisugia. 2. The method for manufacturing a spline piece gear according to claim 1, further comprising, after said spline forming step, a reverse taper forming step of forming a fitting surface of said spline portion into a reverse taper shape by forging. 3. The spline piece gear according to claim 1, further comprising a disk-shaped metal plate forming step of punching a metal plate to form a disk-shaped metal plate before the press drawing step. Method.