JPH0221897B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and apparatus for manufacturing a clutch member having a reverse tapered clutch groove.

(Prior Art) In a clutch member used in a racing motorcycle such as a road racer, a clutch groove recessed in a side surface of the clutch member has a reverse taper (including cases where only one side surface has a reverse slope). The same applies hereafter), and the structure is designed to prevent so-called "clutch disengagement."

Conventionally, such a reverse taper clutch groove has been formed by cutting using an end mill or the like due to its structure.

(Problem to be Solved by the Invention) Recently, clutch members having this inversely tapered clutch groove have been applied to general commercial vehicles, and the conventional cutting method described above requires a large number of machining steps and reduces manufacturing costs. Therefore, it is not suitable for mass production. Therefore, there has been a demand for the development of an economical method of manufacturing clutch members suitable for mass production.

The present invention has been made in view of such needs, and is a method for manufacturing a clutch member having a reverse taper clutch groove, which is suitable for mass production and can significantly reduce manufacturing costs by forming the reverse taper clutch groove by cold forging. and its manufacturing equipment.

(Means for Solving the Problems) In order to achieve the above object, the solving means of the present invention is provided on the side surface of the base at predetermined intervals in the circumferential direction, and one end surface or both end surfaces are formed with a reverse taper. The present invention is directed to a method of manufacturing a clutch member having a plurality of reversely tapered clutch grooves. Then, after forming a material with a plurality of clutch groove molded parts formed on the side surface at predetermined intervals in the circumferential direction by die forging, a reverse taper of a movable die having a divided structure in each clutch groove molded part is formed. With the molded parts inserted, the part between adjacent clutch groove molded parts on the side surface of the material is pressurized in the depth direction of the clutch groove molded part with a fixed die to plastically deform the clutch groove molded part. A reverse taper clutch groove having a shape corresponding to the reverse taper molded portion is molded.

Further, as a manufacturing apparatus for a clutch member used in the method of the present invention, each of the clutch groove formed parts of a material having a plurality of clutch groove formed parts formed on the side surface at predetermined intervals in the circumferential direction is used. The present invention is directed to manufacturing equipment for forming a reverse tapered clutch groove in which the end face or both end faces are formed with a reverse taper. and has a center hole that opens upward and has a diameter corresponding to the circumferential portion where the clutch groove element shape portion is provided on the front side of the material,
A plurality of pressurizing portions are provided on the inner wall of the opening of the center hole in correspondence with the portions between the adjacent clutch groove molded portions on the side surface of the material, protruding radially inward and pressurizing the portions between them. Equipped with a fixed die. The upper end of the fixed die is inserted into the center hole of the fixed die so as to be movable up and down, with the upper end protruding above the fixed die. The movable die is supported in an upper position and has a plurality of inversely tapered molded parts each formed with a divided structure consisting of parts that are relatively slidable in the vertical direction. Further, the movable die is disposed above the movable die so as to be movable up and down, and when descending, the material supported by the inverse tapered forming part of the movable die is lowered together with the movable die, and the part between the two is brought into contact with the pressurizing part of the fixed die. punching means for applying pressure so that the inverted tapered part is plastically deformed into a shape corresponding to the inverted tapered part. Furthermore, while moving the movable die upward in conjunction with the upward movement of the punching means,
The structure includes a knockout means for relatively sliding the divided portions of each reverse taper molded part so that the reverse taper molded part escapes from the reverse taper clutch groove formed by the pressure of the punch means.

As a result, with the movable die protruding above the fixed die, the material previously formed by die forging is placed on the movable die, and the reverse taper forming portion of the movable die is placed in each clutch groove shape portion of the material. Place it so that it will be inserted. Next, when the punching means is lowered to pressurize the material on the movable die, the portion between adjacent clutch groove shapes on the material is moved in the depth direction of the clutch groove shapes by the pressurizing part of the fixed die. It is pressurized and crushed to undergo plastic deformation, and the amount of material that is compressed flows between the tapered surface of the reverse taper molded part and the clutch groove molded part. As a result, the clutch groove element is formed into a reverse taper clutch groove having a shape corresponding to the reverse taper molded portion. Thereafter, when the punch means is raised, the movable die is raised by the knockout means in conjunction with this, and the divided portions of each reverse taper forming section slide relative to each other, thereby causing the reverse taper forming is pulled out from the reverse taper clutch groove.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

A clutch member to which the present invention is applied is shown in FIGS. 1 and 2. The clutch member 1 has six clutch grooves 3 recessed on one side of the base 2 at equal intervals on the same circumference, and has a spline hole 4 in the center.

The clutch groove 3 has one end surface 3a (acceleration side)
As shown in the figure, it is inclined at a predetermined inclination angle (for example, about 4 degrees) with respect to the vertical plane, and is formed in a reverse taper (reverse slope), and the four corners 3c... are shown in Fig. 1. It is shaped like an angular shape. The clutch groove 3 is formed by swaging a clutch groove preform 6 recessed in one side of the base 2 of the material 5 as shown in FIGS. 3 and 4. The clutch groove preform 6 is formed by die forging, and the inner circumferential side surface 7, the outer circumferential side surface 8, and the end surface 3b on the deceleration side are all formed to correspond to the shape of the clutch groove 3. Each surface has a draft angle because it is die-forged. Also, the height H between the surface of the intervening portion 17 between the adjacent clutch groove element forming parts 6 and the bottom surface of the clutch groove element forming part 6
The depth h (see FIG. 4) is set slightly larger than the depth h of the clutch groove 3 (see FIG. 2) in consideration of the fact that the intervening portion 17 is subjected to swaging.

Further, FIGS. 5 to 7 show a manufacturing apparatus 9 for performing the above-mentioned swaging process. The manufacturing device 9
The main parts include a fixed die 10, a movable die 11, a punching means 12, and a knockout means 13.

The fixed die 10 has a center hole 14 opening upward in the center thereof, and the center hole 14 is formed to have a diameter corresponding to a circumferential portion passing through the outer circumferential side surface 8 of the clutch groove preform 6 on the side surface of the material 5. ing. The center hole 14
Inside, the movable die 11 is fitted so as to be movable up and down with its upper end protruding above the fixed die 10, and an expansion pin 15 is mounted on the central axis of the center hole 14 with a mounting bolt 16. is attached, and the expansion pin 15
A bulge 18 is formed at the upper end of the holder.

The movable die 11 consists of a first die 19 and a second die 20. The first die 19 has a shape as shown in FIG.
The outer periphery 21 of the annular base 21 is slidably fitted into the annular base 21.
6 dice members 22 are arranged upright at equal intervals in the circumferential direction on a. A first molded part 23 is provided at the tip (upper end) of the second die member 22, and the first molded part 23 corresponds to the acceleration side end surface 3a of the clutch groove 3 of the clutch member 1 (see FIG. 2). It has a tapered surface 23a that is inclined.

On the other hand, the second die 20 has a shape as shown in FIG. The die members 25 are arranged vertically at equal intervals, and a second molding portion 26 is provided at the tip (upper end) of the die member 25 .

When the first and second dies 19, 20 are attached, each of these die members 22, 25
... are arranged on the same circumference (see FIGS. 5 and 6), and the first and second molded parts 23, 26
are a pair, and as shown in FIG. 7, the four corners 27a form an angular inverted tapered part 27, and as shown in FIG. It is structured to be inserted into the shaped portion 6.

Further, the contact surfaces 28 and 29 between the first molded part 23 and the second molded part 26 are formed into gentle spiral surfaces that correspond to each other, so that the first and second molded parts 23 and 26 are relatively When sliding, the second molded part 26
The structure is such that it can be twisted elastically.

In addition, as shown in FIG.
Pressurizing portions 30 are provided between 7 and 27 in correspondence with the intervening portion 17, respectively, and protrude inward in the radial direction.

The punch means 12 is for pressurizing the material 5 placed on the movable die 11.
It is provided above 1 so that it can be moved up and down by hydraulic pressure or the like.

The knockout means 13 moves up the second die 20 of the movable die 11 in conjunction with the upward movement of the punching means 12, while simultaneously knocking out the first die 19 and the second die 20 of the movable die 11.
It is for sliding relative to the die 20, and is provided at the bottom 31 of the center hole 14 so as to be movable up and down. The knockout pins 32 of the knockout means 13 contact and support the lower end surface 20a of the second die 20. Further, the first die 90 is constantly pressed upward by the resilient spring 33,
The rising end position is regulated by the bulge 18.

In addition, when the movable die 11 descends to the maximum,
As shown in FIG.
It is designed to stand out.

Next, a method of manufacturing the clutch member 1 will be explained.

(i) A material 5 as shown in FIGS. 3 and 4 is formed by die forging (preforming).

(ii) The movable die 11 of the manufacturing device 9 is replaced with the fixed die 1.
0 (see FIG. 5), the preformed material 5 is placed on this movable die 11.
are placed in such a manner that the reverse taper forming portions 27 of the movable die 11 are inserted into the clutch groove forming portions 6 of the material 5 (see FIG. 11).

(iii) The punch means 12 is lowered to the position shown in FIG. 6 (thereby the movable die 11 is also lowered), and the material 5 on the movable die 11 is pressurized.
Then, the space 17 (see FIG. 3) between the adjacent clutch groove molded parts 6, 6 in the material 5 is pressed in the depth direction of the clutch groove molded part 6 by the pressurizing part 30 of the fixed die 10. The material of the raw material 5 is compressed and plastically deformed, and the material of the raw material 5 is compressed to the extent that the material is compressed and deformed plastically.
3a and the clutch groove element 6 (see FIG. 12). As a result, the clutch groove original molded portion 6 is molded into an inverted tapered clutch groove 3 having a shape corresponding to the inverted tapered molded portion 27, resulting in a product.

(iv) Finally, when the punching means 12 is raised, at the same time, the knockout pins 32 of the knockout means 13 are raised, and the second die 20 of the movable die 11 is raised. Then, at this time, the first die 19 also rises due to the elastic spring 33, but when the upper end surface 21a of the annular base 21 abuts against the bulge 18 of the expansion pin 15, the first die 19 no longer moves up. Unable to protrude, as a result, the first die is 1
9 and the second die 20 will slide relative to each other. As a result, the second forming portion 26 of the second die 20 rises while being slightly twisted in the circumferential direction (see FIG. 5). Due to this twisting action, the first molded part 23 is pulled out from the clutch groove 3 of the product clutch member 1, and the clutch member 1 is removed from the movable die 11.

(v) After that, repeat operations (i) to (iv) in order,
Clutch member 1 is mass-produced.

The base 2 of the clutch member 1 is then subjected to gear cutting and heat treatment by well-known means to form a transmission gear (not shown) having a clutch groove. Of course, the swaging process for 6 can be performed after the gear cutting process is completed.

In addition, in the above-mentioned embodiment, the reverse taper molded portion 27 has a two-part structure, and only one end surface of the clutch groove, that is, the acceleration side end surface 3a where "clutch disengagement" is likely to occur, is molded into a reverse taper surface. If the tapered molded part 27 has a three-part structure (not shown), both end surfaces 3a and 3b can be molded into reverse tapered surfaces, and the reversely tapered molded part 27 can be reliably pulled out from the clutch groove 3 after molding. It can be done easily.

(Effects of the Invention) As described in detail above, according to the method of manufacturing a clutch member of the present invention, after forming a material by die forging in advance, the clutch groove part of the material is swaged (cold forging). ) to form the reverse taper clutch groove, it does not require cutting that requires a large number of processing steps, making it efficient and suitable for mass production.

Further, according to the manufacturing apparatus of the present invention, the clutch member having the above-mentioned inversely tapered clutch groove can be manufactured continuously, mass production is possible, and manufacturing costs can be significantly reduced. Ideal for manufacturing clutch members used in

[Brief explanation of drawings]

The drawings illustrate an embodiment of the present invention, and FIG. 1 is a bottom view of the clutch member, FIG. 2 is a front view of the clutch member, FIG. 3 is a bottom view of the material, FIG. 4 is a front view of the clutch member, and FIG. FIG. 6 is a front sectional view showing the manufacturing device with the movable die raised, FIG. 6 is a front sectional view showing the manufacturing device with the movable die lowered, and FIG. 7 is a partially cutaway plan view showing the main parts of the manufacturing device. , Figure 8 shows the first movable die.
A perspective view showing the die, FIG. 9 shows the second part of the movable die.
A perspective view showing the die; FIG. 10 is a partially imaginary plan view showing the relationship between the movable die and the clutch groove forming part;
Fig. 11 is a cross-sectional view taken along the line X-X in Fig. 10 showing the state of the clutch groove part before swaging, and Fig. 12 corresponds to Fig. 11 showing the state after swaging. This is a diagram. DESCRIPTION OF SYMBOLS 1...Clutch member, 2...Base, 3...Clutch groove, 3a, 3b...End face, 5...Material, 6...
...Clutch groove element forming section, 9...Manufacturing equipment, 10...
Fixed die, 11...Movable die, 12...Punching means, 13...Knockout means, 14...Center hole, 17...Interval portion, 19...First die, 2
0...Second die, 27...Reverse taper molding part, 3
0...Pressure section.

Claims (1)

[Scope of Claims] 1. A method for manufacturing a clutch member having a plurality of reverse tapered clutch grooves provided on a side surface of a base at predetermined intervals in the circumferential direction and having one or both end surfaces formed with a reverse taper. , After forming a material with a plurality of clutch groove molded portions formed on the side surface at predetermined intervals in the circumferential direction by die forging, reverse taper forming of a movable die having a divided structure in each of the clutch groove molded portions is performed. With the parts inserted, the part between the adjacent clutch groove parts on the side surface of the material is pressurized in the depth direction of the clutch groove part with a fixed die to plastically deform it. 1. A method of manufacturing a clutch member having an inversely tapered clutch groove, the method comprising forming an inversely tapered clutch groove having a shape corresponding to a tapered molded portion. 2. Molding each of the clutch groove preforms of a material having a plurality of clutch groove preforms formed on the side surface at predetermined intervals in the circumferential direction into a reverse taper clutch groove having one or both end surfaces formed with a reverse taper. The manufacturing apparatus has a center hole that opens upward and has a diameter corresponding to a circumferential portion of the side surface of the material in which the clutch groove element is provided, and the center hole is connected to the inner wall of the opening portion of the side surface of the material. A fixed die provided with a plurality of pressurizing parts that protrude radially inward and pressurize the part between adjacent clutch groove molded parts, and a center hole of the fixed die. The upper end is made to protrude above the fixed die and is fitted so as to be movable up and down, and the upper end is inserted into each of the clutch grooves of the material to support the material at a position above the fixed die, and each a movable die formed with a plurality of inverted tapered molded parts having a divided structure consisting of parts that are relatively slidable in the vertical direction; Punching means for lowering the material supported by the reverse taper forming portion of the die together with the movable die and applying pressure so that the intermediate portion abuts the pressurizing portion of the fixed die and is plastically deformed into a shape corresponding to the reverse taper forming portion. and, while moving the movable die upward in conjunction with the upward movement of the punch means, each reverse taper molded part is moved so that the reverse taper molded part escapes from the reverse taper clutch groove formed by the pressure of the punch means. 1. A manufacturing apparatus for a clutch member having a reverse tapered clutch groove, comprising knockout means for relatively sliding the divided portions of the clutch member.