JP2865587B2 - Method of manufacturing toothed transmission element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a toothed transmission element having a plurality of axially extending teeth formed on at least an inner periphery of a cylindrical portion having a flange on an outer diameter surface.

[0002]

2. Description of the Related Art Generally, in an automatic transmission in which a planetary gear type transmission is operated by a driving force from a torque converter, a hydraulic transmission is provided in a torque transmission path between the torque converter and the planetary gear type transmission. Has a built-in clutch.

Generally, a multi-plate friction clutch is used as the clutch. The clutch drum shown in FIG. 7 is conventionally known as the clutch drum of the clutch.

In the clutch drum 40, a cylindrical portion 43 is provided on an outer diameter portion of an end plate 42 having a boss portion 41, and an axial movement of a friction plate is guided on an inner diameter surface of the cylindrical portion 43, and a cylinder is provided. A plurality of axial teeth 44 for transmitting torque between the cylindrical portion 43 and the friction plate are formed, and a flange 45 is provided at a distal end portion of the outer diameter surface of the cylindrical portion 43.

In the production of the clutch drum 40 as described above, if a processing method by cutting is adopted, it takes time,
Since the yield is poor and the fiber flow is cut, there is a problem that the strength is significantly reduced.

[0006] In Japanese Patent Application Laid-Open No. 6-23461,
A manufacturing method is described in which a toothed transmission element can be manufactured by plastic working.

However, in the manufacturing method described in the above publication, the work is bent while rotating the press roller, and the work is stretched along the outer circumference of the press core bar having teeth. Flange 45 as shown by
Cannot be employed in the manufacture of toothed transmission elements having

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a toothed transmission element having a flange, such as a clutch drum, in a simple and efficient manner.

[0009]

According to a first aspect of the present invention, a mandrel for holding a blank between a tailstock and a tailstock is provided with a small-diameter shaft at the end of a large-diameter shaft. A shaping roller comprising a stepped shaft, a plurality of teeth extending in the axial direction provided on the outer peripheral surface of the small diameter shaft portion, and a forming roller provided so as to be able to adjust the position in the radial direction of the tailstock member is provided at the outer peripheral corner of the large diameter end. A conical roller portion having an arcuate surface formed thereon, and a circular roller portion for forming a flange provided on a large end surface of the conical roller portion, and a small diameter shaft portion of the mandrel and a tailstock member form a circle. A circular roller is formed by sandwiching a disk-shaped blank having a plate-shaped or cylindrical-shaped portion on an outer diameter portion, and rotating the blank in one direction to adjust a plurality of forming rollers in the radial direction of the tailstock member. Part of the mandrel in the axial direction, The cylindrical portion formed on the outer peripheral portion of the blank is pressed inward in the radial direction by the arc surface of the roller portion, and is extended in the axial direction to a position where it comes into contact with the end surface of the large-diameter shaft portion, along the end surface of the large-diameter shaft portion. The outer diameter surface of the flange extending in the outer diameter direction is formed by a circular roller portion.

In the second aspect of the present invention, the mandrel for holding the blank with the tailstock comprises a stepped shaft having a small-diameter shaft portion formed at the tip of a large-diameter shaft portion. A plurality of teeth extending in the axial direction are formed on the inner periphery of the cylindrical portion formed on the outer peripheral portion of the end surface of the large-diameter shaft portion, and are provided so as to be freely adjustable in the radial direction of the tailstock, and are rotatably supported. A plurality of formed forming rollers are formed in a conical shape in which an arc surface is formed at an outer peripheral corner of a large end surface, and a disc-shaped blank having a disc-shaped or cylindrical portion at an outer diameter portion by the tailstock and a mandrel. While the blank is rotated in one direction, the forming roller whose position is adjusted in the radial direction of the tailstock is moved in the axial direction of the mandrel, and the cylindrical portion provided on the outer periphery of the blank is radiused. Abuts the end face of the large-diameter shaft while pushing it inward in the direction It adopts a configuration which is adapted extend pushed axially to the position.

[0011]

As described above, the blank which rotates in one direction is plastically stretched in the axial direction and the radial direction of the mandrel by pushing the forming roller, so that the fiber flow is not cut, and the flange having a high strength is provided. The toothed transmission element can be manufactured efficiently.

The transmission element is formed by cold forming,
Any of warm forming may be used.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIGS. 1 and 2 (I) and (II) show a first embodiment of the present invention. As shown, the molding device is:
It comprises a mandrel 1, a tailstock 10 disposed coaxially with the mandrel 1, and a plurality of forming rollers 20 provided around the mandrel 10.

The mandrel 1 comprises a stepped shaft having a small-diameter shaft portion 3 formed at the tip of a large-diameter shaft portion 2, and a plurality of teeth 4 extending in the axial direction on the outer periphery of the small-diameter shaft portion 3.

The tailstock 10 is provided movably with respect to the mandrel 1, and has a disk portion 11 at its tip.

The forming roller 20 has a conical roller portion 21.
And a circular roller portion 22 formed on the large end surface of the conical roller portion 21. An arc surface 23 is provided at an outer peripheral corner of the large end surface of the conical roller portion 21.

The molding roller 20 is provided so as to be freely adjustable in the radial direction of the tailstock 10 and is simultaneously moved in the axial direction of the mandrel 1. The forming rollers 20 are arranged at predetermined intervals in the circumferential direction on the same plane.

The blank 30 formed by the above-mentioned forming apparatus may be a disk having a boss 31 as shown in FIG. 1 or a disk as shown in FIG. The boss portion 31 may be formed on the inner diameter portion of the portion 32, and the cylindrical portion 33 having an inner diameter smaller than the outer diameter of the small diameter shaft portion 3 of the mandrel 1 may be provided on the outer diameter portion of the disk portion 32. . Further, the boss 31 of the blank 3 shown in FIG. 1 is omitted, or the boss 3 of the blank 30 shown in FIG.
1 may be omitted.

When a disc-shaped blank 30 as shown in FIG. 1 is used, a spherical surface 24 is provided on the end face of the circular roller portion 22 of the forming roller 20.

When the blank 30 having the boss 31 is used, a hole 5 into which the boss 31 is loosely fitted is provided on the end face of the small diameter shaft 3 of the mandrel 1.

Now, as shown in FIG. 2 (I), the disk portion 32 of the blank 30 having the cylindrical portion 33 is sandwiched between the mandrel 1 and the tailstock 10 so that the mandrel 1 and the tailstock 10 can be sandwiched. The blank 30 is rotated in one direction by the rotation, and the plurality of forming rollers 20 are inscribed circle D _{1 of the} arc surface 23.
Tailstock 10 so that is equal to the outer diameter of the cylindrical portion of the product.
After the position of the forming roller 20 is adjusted in the radial direction, when the forming roller 20 is moved in the axial direction of the mandrel 1 with the circular roller portion 22 first, the cylindrical portion 33 provided on the outer peripheral portion of the blank 30 is The mandrel 1 is pushed inward in the radial direction of the mandrel 1 by the circular arc surface 23, and is brought into close contact with the outer peripheral surface of the small-diameter shaft 3, and is extended in the axial direction of the small-diameter shaft 3.

As shown in FIG. 2 (II), when the distal end of the cylindrical portion 33 is extended to a position where it comes into contact with the end face of the large-diameter shaft portion 2, the distal end of the cylindrical portion 33 is moved in the radial direction of the mandrel 1. The flange 34 extends outward.

At this time, the circular roller portion 22 of the forming roller 20 limits the outward extension of the flange portion 34 and forms the outer diameter surface of the flange portion 34.

The excess thickness flows into a gap formed between the outer periphery of the mandrel 1 and the circular roller portion 22 of the forming roller 20, forming a burr 35. By removing the burr 35 by turning or the like, as shown in FIG. 7, a transmission element 40 in which teeth 44 are formed on the inner periphery of the cylindrical portion 43 and a flange 45 is formed on the outer periphery of the cylindrical portion 43. Is molded.

In the molding of the flanged transmission element 40 as described above, if a plurality of projections 6 extending in the axial direction are provided on the end face of the large-diameter shaft portion 2 of the mandrel 1, as shown in FIG. As shown in FIG. 4, a groove 46 extending in the radial direction can be simultaneously formed on the end face of the flange 45, and the groove 46 can be used as a passage for lubricating oil.

When the disk-shaped blank 30 shown in FIG. 1 is used, the outer diameter of the blank 30 is pushed by the spherical surface 24 of the molding roller 20 whose position is adjusted in the radial direction of the tailstock 10. The end portion of the mandrel 1 is bent at the corner of the outer periphery, and pressed against the outer periphery of the mandrel 1 by the arcuate surface 23 and extended in the axial direction of the mandrel 1 to form a cylindrical portion. Is formed.

When the transmission element 40 is formed as described above, the forming roller 20 moves in the axial direction of the mandrel 1 while rotating by contact with the blank 30, so that the surface of the product is not abraded and the plastic working is performed. Therefore, it is possible to obtain a high-quality, high-strength transmission element with high strength.

FIGS. 5A and 5B show another embodiment of the present invention. The mandrel 1 in this embodiment is composed of a stepped shaft provided with a small-diameter shaft portion 3 at the tip of a large-diameter shaft portion 2,
A plurality of teeth 4 extending in the axial direction are provided on the outer peripheral surface of the small diameter shaft portion 3.

On the other hand, a cylindrical portion 7 is formed on the outer peripheral portion of the end face of the large-diameter shaft portion 3, and a plurality of teeth 8 are formed on the inner peripheral surface of the cylindrical portion 7 in the axial direction.

The forming roller 20 whose position is adjusted in the radial direction of the tailstock member 10 has a conical shape, and an arc surface 25 is provided at an outer peripheral corner of a large end surface thereof.

A blank 30 having a cylindrical portion 33 is sandwiched between the mandrel 1 and the tailstock 10, and the blank 30 is rotated in one direction together with the mandrel 1 and the tailstock 10. By moving the forming roller 20 whose position is adjusted in the radial direction in the axial direction of the mandrel 1, the cylindrical portion 33 provided on the outer peripheral portion of the blank 30 is moved radially inside the mandrel 1 by the arc surface 25 of the forming roller 20. The small-diameter shaft portion 3 is pushed into the small-diameter shaft portion 3, and is pushed in the axial direction of the small-diameter shaft portion 3.

When the distal end of the cylindrical portion 33 is extended to a position where it comes into contact with the end face of the large-diameter shaft portion 2, the distal end of the cylindrical portion 33 extends radially outward to form a flange portion 34. As shown in FIG. 5 (II), the outward extension of the flange portion 34 is restricted by the inner peripheral surface of the cylindrical portion 7 of the mandrel 1, and the flange portion 34 comes into close contact with the inner peripheral surface of the cylindrical portion 7.

The surplus is formed by the forming roller 20 and the cylindrical portion 7.
To form burrs 35 between the end surfaces of the ridges.

For this reason, by removing the burr 35 by turning or the like, as shown in FIG. 6, a transmission element in which teeth 44 and 47 are formed on the inner periphery of the cylindrical portion 43 and the outer periphery of the flange 45 is formed. 40 is molded.

[0036]

As described above, in the present invention, the position of the forming roller having the circular roller portion formed on the large end surface of the conical roller portion is adjusted in the radial direction of the tailstock, and the forming roller is rotated by the shaft of the mandrel. The cylindrical part of the blank which is moved in one direction and rotated in one direction is pressed against the outer peripheral surface of the small diameter shaft part of the mandrel, and is pushed and stretched in the axial direction of the small diameter shaft part until it comes into contact with the end face of the large diameter shaft part. Since the outer diameter surface of the flange moving radially outward along the end face of the radial shaft portion is formed by the circular roller of the forming roller, the toothed transmission element having the flange can be formed very efficiently. .

In addition, since the molding is performed by plastic working, the fiber flow of the material is not cut, and a transmission element excellent in strength can be obtained.

Further, the forming roller was formed into a conical shape in which an arc surface was formed at the outer peripheral corner of the large end surface, a cylindrical portion was provided at the outer peripheral portion of the end surface of the large diameter shaft portion of the mandrel, and teeth were formed on the inner surface of the cylindrical portion. Thereby, a toothed transmission element having a flange, teeth formed on the outer diameter surface of the flange, and teeth provided on the inner periphery of the cylindrical portion can be formed extremely efficiently.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a molding apparatus used in a molding method according to the present invention.

FIGS. 2 (I) and (II) are diagrams showing stepwise a blank molding state.

FIG. 3 is a sectional view showing another example of the molding apparatus.

4 is a partially cutaway front view of a transmission element formed by the forming apparatus of FIG. 3;

5A and 5B show still another example of the molding apparatus; FIG. 5I is a sectional view showing a state before blank molding, and FIG. 5B is a sectional view showing a state after blank forming.

FIG. 6 is a partially cutaway perspective view of a transmission element formed by the forming apparatus of FIG. 5;

FIG. 7 is a sectional view showing a clutch drum of a clutch for an automatic transmission.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mandrel 2 Large diameter shaft part 3 Small diameter shaft part 4 Teeth 6 Projection part 7 Cylindrical part 8 Teeth 10 Tailstock 20 Forming roller 21 Conical roller part 22 Circular roller part 23, 25 Arc surface 30 Blank

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B21D 22/16 B21D 53/28 B21H 5/00

Claims (3)

(57) [Claims] 1. A mandrel for clamping a blank with a tailstock comprises a stepped shaft having a small diameter shaft portion at the tip of a large diameter shaft portion, and teeth extending in the axial direction are formed on the outer peripheral surface of the small diameter shaft portion. A plurality of forming rollers provided so as to be capable of adjusting the position in the radial direction of the tailstock member include a conical roller portion having an arcuate surface formed at an outer peripheral corner of a large diameter end, and a large conical roller portion. A circular roller portion for forming a flange provided on an end face, and a small-diameter shaft portion of the mandrel and a tailstock clamp a disc-shaped blank having a disc-shaped or cylindrical portion on an outer diameter portion. While the blank is rotated in one direction, a plurality of forming rollers whose positions are adjusted in the radial direction of the tailstock are moved in the axial direction of the mandrel with the circular roller portion first, and the arc surface of the conical roller portion The cylindrical part formed on the outer periphery of the blank A tooth that presses inward in the direction and extends in the axial direction to a position where it comes into contact with the end face of the large-diameter shaft portion, and forms the outer diameter surface of the flange extending in the outer diameter direction along the end surface of the large-diameter shaft portion with a circular roller portion. Manufacturing method of a transmission element with a shaft. 2. The method for manufacturing a toothed transmission element according to claim 1, wherein a radially projecting portion is formed on an end face of the large-diameter shaft portion of the mandrel. 3. A mandrel for clamping a blank with a tailstock comprises a stepped shaft having a small-diameter shaft portion formed at the tip of a large-diameter shaft portion, the outer periphery of the small-diameter shaft portion and the end face of the large-diameter shaft portion. A plurality of axially extending teeth are formed on an inner periphery of a cylindrical portion formed on an outer peripheral portion, and a plurality of forming rollers are provided so as to be freely adjustable in a radial direction of the tailstock and rotatably supported. The large end face has a conical shape with an arcuate surface formed at the outer corner, and the tailstock and the mandrel sandwich a disc-shaped blank having a disc-shaped or cylindrical portion in the outer diameter portion, and the blank is clamped. While rotating in one direction, the forming roller whose position is adjusted in the radial direction of the tailstock is moved in the axial direction of the mandrel, and while the cylindrical portion provided on the outer peripheral portion of the blank is pushed inward in the radial direction, it is enlarged. Push in the axial direction until it touches the end face of the radial shaft Of manufacturing the toothed transmission element as described above.