JPH06193647A - Clutch drum and manufacture thereof - Google Patents

Abstract

PURPOSE:To enhance the productivity and reduce the manufacturing cost by decreasing the machining in the manufacture of a clutch drum. CONSTITUTION:A clutch drum is composed of an annular and plate-like side wall part 3 and a cylindrical flange part 2 extended in the axial direction from the outer peripheral side of the side wall part 3, and the side wall part 3 and the flange part 2 are formed in one body by press-working, and the end surface 2c of the flange part 2 is formed by press-working so as to have perfect precision.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch drum used in a multi-plate clutch for vehicles and the like and a method for manufacturing the same.

[0002]

2. Description of the Related Art Generally, an automatic transmission mounted on a vehicle has a multi-plate clutch A as shown in FIG.
The multi-plate clutch A is fixed to a drive shaft 4 and is splined to a clutch drum 1 including a side wall portion 3 and a flange portion 2 connected to the side wall portion 3, and a spline portion 2b of the flange portion 2 of the clutch drum 1. A plurality of separator plates 6, a snap ring 6a for positioning the separator plates 6 in the axial direction, a friction material 7 alternately arranged with the separator plates 6, and a spline coupling to the friction material 7 to form a drive shaft 4 A piston 5 slidably fitted to the clutch hub 8 to which the driving force from the clutch hub 8 is transmitted, and to the cylinder portion 2a of the flange portion 2 of the clutch drum 1 and the cylinder portion 4a formed integrally with the drive shaft 4. And a return spring 9 fixed to the drive shaft 4 and pressing the piston 5, and when the hydraulic pressure is supplied from an oil passage 4b formed in the drive shaft 4, the piston 5 Moves against the return spring 4, presses the separator plate 6 and the friction member 7, thereby transmitting the driving force to the clutch hub 8.

The clutch drum 1 of such a multi-plate clutch A is integrally molded by a press due to problems of productivity and the like. As a conventional manufacturing method, as shown in FIG. Cylinder part 2a
In the outer peripheral trimming step, since the length of the material 100 that has been squeezed is different depending on the location in the circumferential direction due to the squeezing step and the outer circumference needs to have the same length to a predetermined dimension
The inner peripheral surface 120a of the trim punch 120 and the outer peripheral surface of the cylinder portion 2a of the material 100 are positioned in the radial direction by the spigot, and the stripper 140 is used to position the material 100.
12, the trim punch 120 and the trim die 130 are used to cut the outer periphery to a predetermined dimension, and as shown in FIG. 12, the spline portion 2 of the clutch drum 1 is formed by the punch 150 and the molding die 160 in the flange-up step.
A method has been performed in which the tubular portion 140 to be b is molded, and thereafter, a spline is molded on the tubular portion 140 in a corrugation process (not shown) to form the spline portion 2b.

[0004]

However, in the above conventional manufacturing method, the positioning of the material in the outer peripheral trim step is performed by the inlay between the inner peripheral surface 120a of the trim punch 120 and the outer peripheral surface of the cylinder portion 2a of the material 100. Although this spigot is used, a predetermined gap is required because the outer peripheral surface of the cylinder portion 2a needs to be fitted to the inner peripheral surface of the trim punch 120. Therefore, in actuality, the positioning of the material 100 is ensured. Since it is not formed, the dimension of the outer circumference of the material 100 may be different in the circumferential direction by the gap. Further, in the flange-up step, since the material 100 is further formed into the squeezing tubular portion 140, a difference in the length of the material extending in the circumferential direction results in a dimensional error of the end surface 2c. The end surface 2c of the spline portion 2b after finishing all has poor dimensional accuracy and needs to be ground by lathe processing, resulting in poor productivity and a great disadvantage in terms of manufacturing cost.

Therefore, in order to solve the above-mentioned conventional problems, the present invention reduces the machining during the manufacturing of the clutch drum, so that the productivity is high and the manufacturing cost can be reduced. An object of the present invention is to provide a drum and a manufacturing method thereof.

[0006]

In order to solve the above-mentioned problems, the clutch drum of the present invention comprises an annular plate-shaped side wall portion (3) and a tubular shape extending axially from the outer peripheral side of the side wall portion. The side wall portion (3) and the flange portion (2) are integrally formed by press working, and the end surface (2c) of the flange portion is formed by press working to completion accuracy. It is characterized by

Further, according to the method of manufacturing the clutch drum of the present invention, the disk-shaped plate is deep-drawn and the side wall portion (3), the cylinder portion (2a) axially extending from the side wall portion, and the diameter from the cylinder portion. The step of forming an annular plate portion (30a) extending in the direction, the step of cutting the outer peripheral end portion of the annular plate portion to a predetermined size, and the step of cutting the outer peripheral end portion of the annular plate portion. A step of bending the tubular portion (60a) by bending it in the direction, and a step of compressing the end surface (70a) of the tubular portion and shaping it to completion accuracy,
And the step of forming the spline portion (2b) by forming the tubular portion formed to the completion accuracy into a spline shape.

[0008]

In the clutch drum of the present invention having the above-described structure, the end surface of the flange portion is formed to the completion accuracy by press working, so that it is not necessary to grind it by machining such as a lathe as in the conventional case. Since the productivity can be improved and the production cost can be reduced, and the occurrence of burrs due to machining can be reduced, for example, when the multi-disc clutch of the automatic transmission is used,
It is possible to prevent the burr from adversely affecting other mechanisms.

Further, according to the method of manufacturing the clutch drum of the present invention, the disk-shaped plate is deep-drawn and the side wall portion, the cylinder portion axially extending from the side wall portion, and the annular plate portion radially extending from the cylinder portion. After that, the outer peripheral end of the annular plate is cut to a predetermined size, and the annular plate whose outer peripheral end is cut is bent in the axial direction to form a tubular part, and then the tubular part Since the end face of is compressed and molded to completion accuracy, it is not necessary to machine the end face, and the productivity is improved and the production cost can be reduced.

Further, in the step of cutting the outer peripheral end portion of the annular plate portion into a predetermined size, the ridge between the annular plate portion and the cylinder portion is positioned by contacting a pressing pilot having a tapered surface. If the cutting is performed after performing, the dimensional accuracy of the end face can be further improved.

Further, if a step of forming a tapered surface at the tip of the end surface is provided as a step prior to the step of compressing the end surface and forming it to completion accuracy, the tapered surface becomes a relief portion of the material, and when the end surface is compressed, The problem that a part of the raw material protrudes to the outside and causes burrs does not occur, and the dimensional accuracy can be further improved.

[0012]

Embodiments Next, embodiments relating to the clutch drum of the present invention will be described with reference to FIG. The clutch drum 1 includes a side wall portion 3 and a tubular flange portion 2 extending axially from the side wall portion 3. The flange portion 2 includes a cylinder portion 2a having an inner peripheral surface on which a piston slides, and a plurality of cylinder portions 2a. Spline part 2b where the separator plate 6 is splined
And a snap ring groove 2e into which a snap ring 6a is fitted in order to position the separator plate 6 in the axial direction. The end surface 2c of the flange portion 2b is formed by press working. A tapered surface 2d formed by press working is formed, and as described later, it has a function as a relief portion for the material when the end surface 2c is pressed.

Next, an embodiment relating to the method of manufacturing the clutch drum of the present invention will be described with reference to FIGS.

First, in the drawing step shown in FIG. 3, the material 10 is clamped and fixed by the stripper 12 and the die 13,
The piercing punch 11 and the die 13 punch a hole in the center of the material 10 to form an inner peripheral surface 10a, and the lifter 14 and the forming punch 15 form a flat surface portion for molding the material 10 to a uniform thickness. Form 10b. At this time, the step portion 10c is formed on the material 10.

Next, in the drawing step shown in FIG. 4, the pin 21 is fitted to the inner peripheral surface 10a of the material 10 formed by the drawing step to position the material 10 in the radial direction, and the punch 22 and It is clamped and fixed to the lifter 23. The outer peripheral side of the material 10 is sandwiched between the stopper 24 and the die 25, and the cylindrical portion 20a is formed by the relative movement of the punch 22 and the die 25 in the axial direction. At this time, the edge 22a of the punch 22 and the edge 25a of the die 25 are
Has a relatively large diameter, and the bent portions between the tubular portion 20a and the flat surface portion 20b and the flat surface portion 20c are not sharply narrowed, so that the material 10 is not wrinkled. Absent.

Next, in the forming step shown in FIG. 5, the pin 31 is fitted to the inner peripheral surface 10a of the material 10 to position the material 10 in the radial direction, and the material is sandwiched and fixed by the punch 32 and the lifter 33. And the material 10 squeezed by the drawing process
In order to further squeeze
4 and the die 35, the punch 32 and the die 35 are relatively moved in the axial direction to form the side wall portion 3 and the cylinder portion 2a of the clutch drum 1, and an annular ring extending radially outward from the cylinder portion 2a. The plate portion 30a is formed.

Next, in the outer peripheral trim step shown in FIG. 6, since the length of the material 10 molded by the above-mentioned steps is different depending on the location, the annular plate portion 3 is formed.
It is necessary to make the outer circumference of 0a the same length with a predetermined size. Therefore, first, the material 10 is positioned in the radial direction by bringing the tapered surface 41a of the tapered pilot 41 into contact with the ridge edge portion 40a of the cylinder portion 2a formed in the radial direction in the upper direction in the drawing. After that, the material 10 is pressed between the presser pilot 42 and the lower holder 43.
Pinch and fix. Then, the outer periphery of the material 10 is cut into a predetermined size by the trim punch 46 and the trim die 47 to form the outer peripheral surface 40c. At this time, the inner side of the blank 10 is also cut by the piercing punch 45 and the piercing die 44 into the desired size of the clutch drum.

Next, in the surface pressing step shown in FIG. 7, the pin 51 is fitted to the inner peripheral surface 40b of the material 10 to position the material 10 in the radial direction, and the surface pressing punch 82 and the lifter 53 are positioned between the surface pressing punch 82 and the lifter 53. The outer peripheral surface 40 of the blank 10 is clamped by the die 54 having the tapered surface 54a and the surface pressing punch 52.
A tapered surface 50a is formed on c.

Next, in the flange-up step shown in FIG. 8, the pin portion 61a of the presser pilot 61 is fitted to the inner peripheral surface 40b of the material 10 to position the material 10 in the radial direction, and the presser pilot 61 and the lifter. It is clamped and fixed between 62. And punch 63 and molding die 64
The cylindrical portion 60a to be the spline portion 2b of the clutch drum 1 is formed by and. At this time, since the material 10 is clamped and fixed between the presser pilot 61 and the lifter 62, the material 10 does not tilt, and it is preferable that the outer circumferential surface 40c has a uniform radial dimension in the trimming step. It does not become non-uniform again.

Next, in the end face compression step shown in FIG.
The material 10 is clamped and fixed by the presser pilot 71 and the lifter 72, and the cylinder portion 2a is provided between the punch 75 and the die 74.
And the cylindrical portion 60a, and the punch 75 and the die 7
4, the compression punch 75 is inserted through the opening between the end face 70 and
By compressing a, the cylinder portion 2a and the tubular portion 60a are formed into a predetermined length. At this time, since the material 10 is compressed in the vertical direction in the drawing by the compression punch 75, the compression punch 75
The material 10 tries to flow out from the gap between the punch 73 and the die 74, but since the taper surface 50a is formed by the surface pressing step, the taper surface 50a serves as a relief portion for the material 10 and is formed on the surface of the end surface 70a. No burr etc. will occur.

Finally, in the corrugation step shown in FIG. 10, the pin 81 is fitted to the inner peripheral surface 40b of the material 10 and the material 10 is held by the lifter 82 and the die 84. The clutch drum 1 is attached to the die 84.
A plurality of concave portions 84a corresponding to the spline shape on the outer peripheral surface of the spline portion 2a are formed, and a plurality of convex portions 83 corresponding to the spline shape on the inner peripheral surface of the spline portion 2b corresponding to the plurality of concave portions 84a. The cam punch 83 in which is formed is brought into contact with the tubular portion 70a. Next, when the cam driver 85 having the taper surface 85a that slides on the taper surface 83b of the cam punch 83 is pushed down in the drawing, the cam punch 83 is formed by the taper surfaces 83b and 85a.
While pressing 0 downward in the drawing, the cylindrical portion 70a is moved to the right in the drawing and the cylindrical portion 70a is splined by the concave portion 84a and the convex portion 83a to form the spline portion 2b.

The present invention is not limited to the above embodiments, but various modifications can be made based on the technical idea described in the claims of the present invention. Does not exclude from.

[Brief description of drawings]

FIG. 1 is a sectional view of a hydraulic servo to which a clutch drum of the present invention is applied.

FIG. 2 is a sectional view of a clutch drum of the present invention.

FIG. 3 is a diagram showing a drawing process of the method for manufacturing the clutch drum of the present invention.

FIG. 4 is a diagram showing a drawing step of the method for manufacturing the clutch drum of the present invention.

FIG. 5 is a diagram showing a molding step of the method for manufacturing the clutch drum of the present invention.

FIG. 6 is a diagram showing an outer periphery trim step of the clutch drum manufacturing method of the present invention.

FIG. 7 is a diagram showing a surface pressing step of the method for manufacturing the clutch drum of the present invention.

FIG. 8 is a diagram showing a flange-up step of the method for manufacturing the clutch drum of the present invention.

FIG. 9 is a view showing an end face compression step of the method for manufacturing the clutch drum of the present invention.

FIG. 10 is a diagram showing a corrugation step of the clutch drum manufacturing method of the present invention.

FIG. 11 is a view showing an outer peripheral trim step of a conventional clutch drum manufacturing method.

FIG. 12 is a diagram showing a flange-up step of a conventional clutch drum manufacturing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Clutch drum 2 ... Flange 2c ... End face of flange 3 ... Side wall

Claims (4)

[Claims] 1. An annular plate-shaped side wall portion and a tubular flange portion extending axially from the outer peripheral side of the side wall portion, wherein the side wall portion and the flange portion are integrally formed by press working. The clutch drum is characterized in that the end surface of the flange portion is molded to completion accuracy by press working. 2. A step of deep-drawing a disk-shaped plate to form a side wall portion, a cylinder portion axially extending from the side wall portion, and an annular plate portion radially extending from the cylinder portion; A step of cutting the outer peripheral end of the annular plate part to a predetermined size, a step of axially bending the annular plate part having the outer peripheral end cut to form a tubular part, and an end face of the tubular part A method for manufacturing a clutch drum, comprising: a step of compressing the molded product to a completion accuracy; and a step of forming a cylindrical portion molded to the completion accuracy into a spline shape and molding the spline portion. 3. In the step of cutting the outer peripheral end of the annular plate portion to a predetermined size, a ridge edge between the annular plate portion and the cylinder portion is brought into contact with a pressing pilot having a tapered surface. The method for manufacturing a clutch drum according to claim 2, wherein the positioning is performed and then the cutting is performed. 4. The method according to claim 2, further comprising a step of forming a tapered surface at a tip end of the end surface before the step of compressing the end surface of the tubular portion and forming it to completion accuracy. Manufacturing method of clutch drum.