JP2667620B2 - Manufacturing method of clutch sleeve - 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 clutch sleeve provided in a transmission or the like of an automobile.

[0002]

2. Description of the Related Art A clutch sleeve provided in a transmission of an automobile or the like has spline teeth on its inner peripheral surface to be engaged with a synchronizer ring and a clutch gear, and a clutch engagement guide is provided at an end of the spline teeth. A chamfered portion serving as a surface is formed, and a rounded chamfered portion is formed inside the chamfered portion. Conventionally, after cutting the end of the spline teeth using a cutting tool to form a mountain-shaped chamfer having both left and right surfaces inclined at a predetermined angle, the inner peripheral surface and the tip of the chamfer are formed into an arc shape by a polishing tool. Beveling has been done.

[0003] Further, as disclosed in Japanese Patent Application Laid-Open No. 56-33172, for example, a clutch sleeve is formed by cold plastic working to form a chamfer portion at the end of a spline tooth. It has been practiced to form a reverse taper portion for preventing the clutch from slipping off by bulging the excess thickness of the chamfer portion to the side of the spline teeth.

[0004]

As described above, in the case where the ends of the spline teeth are cut by a cutting tool to form a chamfer portion or the like, it is difficult to cut the chamfer portion at an appropriate angle. In addition, since the burr is formed by the above cutting process, a process for removing the burr is required, which causes a problem that the number of working steps increases and the manufacturing cost increases.

On the other hand, as shown in the above-mentioned publication, in a configuration in which a chamfer portion is formed by performing cold plastic working on an end portion of a spline tooth, a clutch is formed at the same time when the chamfer portion is formed. While it has the advantage of being able to form a reverse tapered portion for retaining, the formation of the chamfer portion at the end of the spline tooth results in the compression of the end of the spline tooth and shortening its effective length. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a clutch sleeve capable of easily forming a chamfer portion at an end thereof while ensuring a sufficient effective length of spline teeth. The purpose of the present invention is to provide a manufacturing method.

[0007]

The invention according to claim 1 is
After forming a blank formed by cutting spline teeth on the inner peripheral surface, in a state where the blank is set in a press die having a chamfer forming portion, the blank is pressed against the chamfer forming portion to form a spline tooth. In the method for manufacturing a clutch sleeve that presses the end, at the same time that the chamfer portion is pressed at the end of the spline teeth, the backup molding portion provided outside the chamfer molding portion of the pressing die is formed. By swelling the outer end of the spline teeth correspondingly, press-working the backup part that reinforces the spline teeth,
A gear stopper forming portion provided inside the chamfer forming portion of the pressing die presses a concave portion serving as a gear stopper portion between outer portions of adjacent spline teeth. .

According to a second aspect of the present invention, in the method for manufacturing a clutch sleeve according to the first aspect, the chamfer portion is pressed at the end of the spline teeth, and at the same time, the chamfer forming portion of the pressing die is formed. The inner peripheral surface of the end portion of the spline tooth is chamfered by a chamfered molded portion provided on the side.

[0009]

According to the first aspect of the present invention, the end of the spline tooth is adjacent to the chamfer portion serving as a guide surface when the clutch is engaged, and the backup portion for reinforcing the end of the spline tooth. The gear stopper portion located between the outer portions of the spline teeth is simultaneously formed by press working,
Due to the flow of material when forming the gear stopper,
The effective length of the spline teeth is sufficiently ensured.

According to the second aspect of the present invention, the end of the spline tooth is adjacent to the chamfer portion serving as a guide surface at the time of clutch engagement, and the backup portion for reinforcing the end of the spline tooth. The gear stopper portion located between the outer portions of the spline teeth and the chamfered portion located in the inner portion of the chamfer portion are simultaneously formed by press working.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows a press working apparatus used to process a blank 1 to form a clutch sleeve according to the present invention. This press machine is used for blank 1
And a mandrel 3 for processing the lower end of the blank 1 held by the die 2
And a knockout sleeve 4 for pushing up the processed blank 1, a punch 5 for processing the upper end of the blank 1, and a regulating member 6 for restraining the upper end surface of the blank 1 during processing.

The die 2 is supported by a die holder 7 so as to be able to move up and down, and is biased upward by a compression coil spring 8. And under normal conditions,
The die 2 is held at a raised position where a step a formed on the upper outer peripheral surface of the die 2 contacts a protrusion b formed on an upper inner peripheral surface of the die holder 7.

The mandrel 3 is supported by a mandrel holder 9 so as to be able to move up and down, and is urged upward by a compression coil spring 10 so that a step c formed on the outer peripheral surface of the mandrel 9 at normal times is fixed to the mandrel holder. It is configured to be locked at a raised position in contact with a protrusion d formed on the inner peripheral surface of the inner peripheral surface 9. The knockout sleeve 4 is slidably supported along the peripheral surface of the mandrel 3, and is pushed up by a knockout pin 11 at the end of the press working, so that the die 2
Is released from the holding state of the blank 1 held therein.

The punch 5 is held by a punch holder 12 and is configured to be driven up and down by a lifting drive unit (not shown). The regulating member 6 is formed of a cylindrical member having an insertion hole 13 for the punch 5, and is supported by a guide means (not shown) so as to be able to move up and down. When the punch 5 is lowered, the punch 5 is inserted into the insertion hole 13 of the regulating member 6, so that the regulating member 6 is driven to move up and down together with the punch 5.

As shown in FIGS. 2 and 3, the blank 1 is formed of a cylindrical member having spline teeth 14 having a trapezoidal cross section formed on the inner peripheral surface by broaching or the like. A groove 15 is formed along the outer surface of the spline teeth 14. Projections 16 projecting outward from the main body of the blank 1 are formed at both upper and lower ends of the spline teeth 14.

As shown in FIGS. 4 to 6, on the outer periphery of the upper end of the mandrel 3, concave grooves 17 having a trapezoidal section into which the spline teeth 14 of the blank 1 are fitted are formed at predetermined intervals. At the lower end of the groove 17, a chamfer forming part 18 formed of a V-shaped groove for forming a chamfer on the lower end surface of the spline tooth 14, and the spline tooth 1 are formed.
An arc-shaped chamfering forming portion 19 for chamfering the inner peripheral surface at the lower end portion of 4 is formed.

Further, on the outer side of the chamfer forming portion 18, a backup forming portion 20 formed of a concave portion for forming a backup portion for reinforcing the outer peripheral surface of the lower end portion of the spline tooth 14 is formed. The adjacent spline teeth 1
A gear stopper forming portion 21 is formed between the backup portion 4 and a protrusion for forming a gear stopper portion described later.

The lower end of the punch 5 has the same shape as the concave groove 17 formed in the upper end of the mandrel 3, the chamfer forming part 18, the chamfer forming part 19, and the backup forming part 20. Each part is arranged vertically symmetrically with each part of the mandrel 3.

A method for manufacturing a clutch sleeve using the press working apparatus having the above configuration will be described below. First,
As shown in FIG. 1, by inserting the blank 1 into the die 2 locked at the raised position, the lower end of the blank 1 is placed on the upper end of the mandrel 3 as shown in FIG. In this way, by lowering the punch 5, the lower end of the punch 5 is fitted into the upper end of the blank 1 and press working is performed.

That is, the lower end of the punch 5 is fitted into the insertion hole 13 of the regulating member 6 as the punch 5 descends, and the punch 5 and the regulating member 6 descend in an integrated state, so that the punch 5 and the regulating member 6 fall into the die 2. The set blank 1 is pushed down by the regulating member 6. As a result, mandrel 3
Is pressed downward by the blank 1 and the compression spring 10
Will fall against the urging force of

The lower end of the mandrel 3 is
When the lower end of the blank 1 is pressed against the upper end of the mandrel 3 while the outer peripheral portion of the blank 1 is restrained by the die 2 when the lower end of the blank 1 is restrained by the die 2, the upper end of the blank 1 The lower end of the punch 5 is press-fitted, whereby the upper and lower ends of the spline teeth 14 and the peripheral edge thereof are pressed.

That is, the lower end surface of the spline tooth 14 is pressed by the chamfer molding portion 18 formed of the V groove provided at the tip end portion of the mandrel 3 as shown in FIG.
As shown in FIG. 7, a chamfer portion 24 is formed in which the left and right sides of the lower end of the spline tooth 14 are inclined at a predetermined angle. At the same time that the chamfer portion 24 is pressed, the bulging portion corresponding to the backup forming portion 20 formed of a concave portion provided on the outside of the chamfer forming portion 18 of the mandrel 3 is formed at the end of the spline tooth 14. The backup part 25 which reinforces the said spline tooth 14 by being formed in a part outside part is formed.

At the same time that the chamfer portion 24 is pressed, the chamfer forming portion 1 of the mandrel 3 is pressed.
The inner peripheral surface of the lower end portion of the spline tooth 14 is pressed by the chamfered molded portion 19 provided on the inner portion of
An arc-shaped chamfer 26 is formed in this portion. Further, at the same time when the chamfer portion 24 is pressed, the backup molding portions 18 adjacent to each other of the mandrel 3 are formed.
The gear stopper forming portion 21 formed of a projection provided therebetween forms a concave portion serving as the gear stopper portion 27 between the outer portions of the adjacent spline teeth 14.

At the same time that the lower end of the blank 1 is pressed by the mandrel 3,
The upper end of the blank 1 is pressed by the punch 5 so that the chamfer 24,
The backup portion 25, the chamfered portion 26, and the gear stopper portion 27 are pressed.

When the pressing is completed, the knockout sleeve 4 is pushed up by the knockout pin 11 with the punch 5 and the regulating member 6 raised, so that the blank 1 is pushed out of the die 2 and taken out. Finish broaching. Thereafter, the blank 1 is subjected to a rolling process or the like, thereby forming a reverse tapered portion 22 for preventing the clutch of the gear from coming off on the side surface of the spline teeth 14 as shown in FIG.

As described above, the mandrel 3 and the punch 5
At the same time as the chamfer portions 24 are pressed at the upper and lower ends of the spline teeth 14 of the blank 1 by a press die made of the blank 1, the chamfer portions 2 are formed by the backup molding portion 20 provided on the mandrel 3 and the punch 5.
Since the backup portion 25 is formed by bulging the outer portion of 4, the backup portion 25 can effectively reinforce the upper and lower end portions of the spline tooth 14.

Therefore, the chamfer portion 24 can be easily formed into an appropriate shape by press working without causing the chamfer portion 24 to return, and the chamfer portion 24 is large when the clutch sleeve and the clutch gear are engaged. By reinforcing the upper and lower ends of the spline teeth 14 on which the load acts by the backup portion 25,
Damage to the spline teeth 14 can be effectively prevented.

Further, since the gear stopper 27 is pressed between the outer portions of the spline teeth 14 at the same time as the formation of the chamfer 24, the recess formed by the gear stopper 27 is formed. By supplying the material guided laterally to the backup portion 25 and the forming portion of the spline teeth 14, the effect of reinforcing the spline teeth 14 by the backup portion 25 is improved, and the effective length thereof is effectively increased. By increasing the number of teeth, the tooth surface engaged with the clutch gear or the like can be sufficiently secured.

Further, when the chamfered portion 24 is formed and the arc-shaped chamfered portion 26 is pressed on the inner peripheral surface of the end portion of the spline teeth 14, a synchronizer ring, a clutch gear and the like are formed. It is possible to form an engagement guide surface having a proper shape that allows the clutch sleeve to be easily engaged with the gear, and thus the shift feeling of the transmission can be improved.

In the above embodiment, the blank 1 is formed by the mandrel 3 and the punch 5 constituting the pressing die.
Although the upper and lower ends of the blank 1 are simultaneously pressed, the upper end and the lower end of the blank 1 may be pressed in separate steps.

[0031]

As described above, according to the first aspect of the present invention, the chamfer portions are pressed at the upper and lower ends of the spline teeth of the blank by the press die, and at the same time, the press die is backed up. The molding portion causes the outer portion of the chamfer portion to bulge to form a backup portion, and the gear stopper molding portion provided on the side portion of the chamfer molding portion of the pressing die forms adjacent spline teeth. Since the concave portion serving as the gear stopper portion is formed by pressing between the outer portions of the spline teeth, the upper and lower ends of the spline teeth are effectively reinforced by the backup portion, and the chamfer portion is formed by conventional cutting and pressing. It is possible to increase the strength as compared with the one formed with The Nfa portion can be easily formed to the proper shape by press working. In addition, since the effective length of the spline teeth can be increased by forming the concave portion including the gear stopper portion between the outer portions of the adjacent spline teeth, when the chamfer portion is pressed, There is an advantage that the effective length of the spline teeth can be prevented from decreasing due to the compression of the ends of the spline teeth, and the tooth surface engaged with the clutch gear or the like can be sufficiently secured.

The invention according to claim 2 is characterized in that an arc-shaped chamfered portion is pressed on the inner peripheral surface of the end of the spline teeth simultaneously with the formation of the chamfer portion. There is an advantage in that the clutch gear can be easily engaged with the gear and the like, and the engagement guide surface having an appropriate shape that can improve the shift feeling of the transmission can be easily formed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a specific example of a press device used for manufacturing a clutch sleeve according to the present invention.

FIG. 2 is a plan view of a blank constituting the clutch sleeve.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a partial front view showing a main part of the mandrel.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is a sectional view taken along line CC of FIG. 4;

FIG. 7 is a cross-sectional view showing a press working state of a blank by a press device.

FIG. 8 is a perspective view showing a state of a blank subjected to press working.

[Explanation of symbols]

 Reference Signs List 1 blank 3 mandrel (press mold) 5 punch (press mold) 18 chamfer molding section 19 chamfer molding section 20 backup molding section 21 gear stopper molding section 24 chamfer section 25 backup section 27 gear stopper section 26 chamfer section

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshio Nakamura 718 Koike, Nishigo-cho, Hirata-shi, Shimane Prefecture Inside of Matsuda Seiki Co., Ltd. −33172 (JP, B2)

Claims (2)

(57) [Claims] 1. After forming a blank formed by cutting spline teeth on an inner peripheral surface, the blank is pressed against the chamfer forming part in a state where the blank is set in a press die having a chamfer forming part. In the method of manufacturing a clutch sleeve for press-working the ends of the spline teeth, the chamfer portion is press-worked at the ends of the spline teeth and provided at the outer portion of the chamfer forming portion of the pressing die. end outer side portion of the spline teeth so as to correspond to the backup molding portion by bulging was, both when the backup portion for reinforcing the spline teeth pressing the side of the chamfer forming portion of the press die
Adjacent parts are formed by the gear stopper forming part
Concave portion serving as a gear stopper between the outer portions of the spline teeth
A method of manufacturing a clutch sleeve, characterized in that the clutch sleeve is pressed . 2. A chamfer forming part provided inside a chamfer forming part of a pressing die at the same time as the chamfering part is pressed at an end of the spline tooth. The method for manufacturing a clutch sleeve according to claim 1 , wherein the clutch sleeve is configured to be processed.