JP3304460B2 - Clutch drum and method of manufacturing the same - Google Patents

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 for a multi-plate clutch of a vehicle or the like and a method of 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 spline-coupled to a clutch drum 1 composed of a side wall 3 and a flange 2 connected to the side wall 3, and a spline 2b of the flange 2 of the clutch drum 1. A plurality of separator plates 6; snap rings 6a for positioning the separator plates 6 in the axial direction; frictional members 7 alternately arranged with the separator plates 6; The piston 5 is slidably fitted to the clutch hub 8 to which the driving force is transmitted, and 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. When hydraulic pressure is supplied from an oil passage 4 b 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.

[0003] The clutch drum 1 of such a multi-plate clutch A is integrally formed by pressing in view of productivity and the like. As a manufacturing method, conventionally, as shown in FIG. Cylinder part 2a
Since the length of the material 100 whose diameter extends in the circumferential direction by the drawing process differs depending on the location and the outer circumference needs to be the same length to a predetermined dimension, in the outer circumference trimming process,
The inner peripheral surface 120a of the trim punch 120 and the outer peripheral surface of the cylinder portion 2a of the raw material 100 are positioned in the radial direction by a spigot.
Is pressed to cut the outer periphery to a predetermined size by the trim punch 120 and the trim die 130, and as shown in FIG. 12, the spline portion 2 of the clutch drum 1 is
A method of forming a cylindrical portion 140 to be b, and then forming a spline 2b in the cylindrical portion 140 in a corrugation step (not shown) has been performed.

[0004]

However, in the above-described conventional manufacturing method, the positioning of the material in the outer peripheral trimming step is performed by the spigot between the inner peripheral surface 120a of the trim punch 120 and the outer peripheral surface of the cylinder portion 2a of the raw material 100. However, this spigot requires a predetermined gap since the outer peripheral surface of the cylinder portion 2a needs to be fitted to the inner peripheral surface of the trim punch 120, and thus, in practice, the positioning of the material 100 is reliably performed. Since it is not formed, the dimensions of the outer periphery of the raw material 100 may be different in the circumferential direction by the gap. Further, in the flange-up step, since the raw material 100 is further formed into the drawn cylindrical portion 140, a difference in length of the raw material in the circumferential direction causes a dimensional error of the end face 2c. The end face 2c of the spline portion 2b after all the processes are inferior in dimensional accuracy, needs to be cut by lathe processing, and has a problem that productivity is poor and production cost is extremely disadvantageous.

[0005] In order to solve the above-mentioned conventional problems, the present invention reduces the number of machining operations in the production of a clutch drum, thereby increasing the productivity and reducing the production cost. An object of the present invention is to provide a drum and a method for manufacturing the drum.

[0006]

In order to solve the above-mentioned problems, a clutch drum according to the present invention comprises an annular plate-like side wall (3) and a cylindrical member extending in the axial direction from the outer peripheral side of the side wall. 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 cut to a predetermined size.
It is characterized in that it is formed to the completion accuracy by press working after cutting.

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

[0008]

In the clutch drum of the present invention having the above construction, the end face of the flange portion is cut to a predetermined size.
After forming, it is formed to the required precision by pressing, eliminating the need for conventional machining such as a lathe, thus improving productivity and reducing production costs. Therefore, for example, when used in a multi-plate clutch of an automatic transmission, it is possible to prevent burrs from adversely affecting other mechanisms. Also, the end of the flange
After cutting to the specified dimensions, the surface is tapered to the outer diameter side of the end face.
Surface and then pressed to complete accuracy by pressing.
Part of the material when compressing the end face
Problems such as burrs may occur due to protrusion
To improve the dimensional accuracy
Can be.

Further, according to the method of manufacturing a clutch drum of the present invention, a disk-shaped plate is deeply drawn and a side wall portion, a cylinder portion extending axially from the side wall portion, and an annular plate portion extending radially from the cylinder portion are provided. Then, the outer peripheral end of the annular plate portion is cut into a predetermined size, and the annular plate portion whose outer peripheral end is cut is bent in the axial direction to form a cylindrical portion. Since the end face is compressed and formed to the completion accuracy, it is not necessary to cut the end face by machining, thereby improving the productivity and reducing the production cost.

In the step of cutting the outer peripheral end portion of the annular plate portion to a predetermined size, the ridge between the annular plate portion and the cylinder portion is positioned by abutting a holding pilot having a tapered surface. When cutting is performed after the above, the dimensional accuracy of the end face can be further improved.

Further, if a step of forming a tapered surface at the end of the end surface is provided as a process prior to the step of compressing the end surface and forming it to the completion accuracy, the tapered surface becomes a relief portion of the material, and when the end surface is compressed, Problems such as generation of burrs due to a part of the material protruding to the outside do not occur, and the dimensional accuracy can be further improved.

[0012]

Next, an embodiment 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 cylindrical flange portion 2 extending in the axial direction 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 portion 2b to which separator plate 6 is spline-coupled
And a snap ring groove 2e into which a snap ring 6a is fitted for positioning 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 has an action as a relief portion of the material at the time of press working of the end face 2c as described later.

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

First, in the punching step shown in FIG. 3, the raw material 10 is sandwiched and fixed between the stripper 12 and the die 13,
A piercing punch 11 and a die 13 are used to punch a hole in the center of the material 10 to form an inner peripheral surface 10a, and a lifter 14 and a forming punch 15 for forming the material 10 into a uniform thickness. Form 10b. At this time, a step 10c is formed in the raw material 10.

Next, in a drawing step shown in FIG. 4, a pin 21 is fitted to the inner peripheral surface 10a of the material 10 formed by the punching step, thereby positioning the material 10 in the radial direction, and It is clamped and fixed between the lifter 23. Then, 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 ridge 22a of the punch 22 and the ridge 25a of the die 25
Has a relatively large diameter, and the bent portions between the cylindrical portion 20a and the flat portion 20b and the flat portion 20c are not narrowed down sharply. Absent.

Next, in a forming step shown in FIG. 5, a pin 31 is fitted to the inner peripheral surface 10a of the material 10 to position the material 10 in the radial direction, and is clamped and fixed between the punch 32 and the lifter 33. Then, the material 10 squeezed by the squeezing process
In order to further squeeze the material, the outer peripheral side of
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 shape extending radially outward from the cylinder portion 2a. The plate part 30a is formed.

Next, in the outer periphery trimming step shown in FIG. 6, the length of the material 10 formed in each of the above-described steps in the circumferential direction differs depending on the location.
It is necessary to make the outer circumference of Oa the same length of a predetermined dimension. For that purpose, 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 upper ridge edge portion 40a of the cylinder portion 2a formed in the radial direction by the molding step, Thereafter, the material 10 is moved between the presser pilot 42 and the lower holder 43.
And fix it. 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 inside of the material 10 is also cut into a desired size of the clutch drum by the piercing punch 45 and the piercing die 44 to form the inner peripheral surface 40b.

Next, in the face pressing step shown in FIG. 7, the pins 51 are fitted into the inner peripheral surface 40b of the material 10 to position the material 10 in the radial direction, and between the face pressing punch 82 and the lifter 53. The outer peripheral surface 40 of the material 10 is clamped and fixed, and the die 54 having the tapered surface 54a and the face 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 perform positioning of the material 10 in the radial direction. 62 and fixed. Then, a punch 63 and a molding die 64
Thus, the cylindrical portion 60a to be the spline portion 2b of the clutch drum 1 is formed. At this time, since the material 10 is sandwiched and fixed between the presser pilot 61 and the lifter 62, the material 10 does not tilt and the outer peripheral surface 40c has a uniform radial dimension in the outer trim process. It does not become uneven again.

Next, in the end face compression step shown in FIG.
The blank 10 is clamped and fixed between the presser pilot 71 and the lifter 72, and the cylinder 2 a is sandwiched between the punch 75 and the die 74.
And the cylindrical portion 60a, and the punch 75 and the die 7
The compression punch 75 is inserted through the opening between
is compressed to form the cylinder portion 2a and the cylindrical portion 60a to a predetermined length. At this time, since the material 10 is compressed in the vertical direction in the figure by the compression punch 75, the compression punch 75
The material 10 is about to flow out of the gap between the die 73 and the punch 73 and the die 74. However, since the tapered surface 50a is formed by the surface pressing process, the tapered surface 50a serves as a relief for the material 10 and is formed on the surface of the end surface 70a. No burrs are generated.

Finally, in the corrugation step shown in FIG. 10, the pin 81 is fitted on the inner peripheral surface 40b of the material 10 and the material 10 is held by the lifter 82 and the die 84. The die 84 has the clutch drum 1
A plurality of concave portions 84a corresponding to the spline shape of the outer peripheral surface of the spline portion 2a are formed, and a plurality of convex portions 83 corresponding to the spline shape of the inner peripheral surface of the spline portion 2b corresponding to the plurality of concave portions 84a. The cam punch 83 formed with is contacted with the cylindrical portion 70a. Next, when a cam driver 85 having a tapered surface 85a that slides on the tapered surface 83b of the cam punch 83 is pushed downward in the drawing, the cam punch 83 is formed by the tapered surfaces 83b and 85a.
While pressing 0 downward in the figure, the cylindrical part 70a moves rightward in the figure, and the cylindrical part 70a becomes a spline shape by the concave part 84a and the convex part 83a, and the spline part 2b is formed.

The present invention is not limited to the above embodiments, but can be variously modified based on the technical idea described in the claims of the present invention. It is not excluded from.

[Brief description of the 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 according to the present invention.

FIG. 3 is a view showing a punching step of the method for manufacturing a clutch drum according to the present invention.

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

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

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

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

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

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

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

FIG. 11 is a diagram showing an outer periphery trimming step of a conventional clutch drum manufacturing method.

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

[Explanation of symbols]

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

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16D 11/00-23/14 B21D 19/00 B21D 22/28 B21D 53/28

Claims (5)

(57) [Claims] 1. An annular plate-shaped side wall portion, and a cylindrical flange portion extending in an axial direction from an outer peripheral side of the side wall portion, wherein the side wall portion and the flange portion are integrally formed by press working. The end face of the flange is cut to a predetermined size.
A clutch drum characterized in that it is formed to a completion accuracy by press working after cutting. 2. An end face of the flange portion has a predetermined size.
After cutting, form a tapered surface on the end face outer diameter side, and then
It is featured that it is formed to the accuracy of completion by press working
The clutch drum according to claim 1, wherein A step of deep drawing the disk-shaped plate to form a side wall, a cylinder extending axially from the side wall, and an annular plate extending radially from the cylinder; A step of cutting the outer peripheral end of the annular plate to a predetermined size, a step of bending the annular plate having the outer peripheral end cut in the axial direction to form a cylindrical part, A method for manufacturing a clutch drum, comprising: a step of compressing an end face to form a spline portion, and a step of forming a cylindrical portion formed to the completion accuracy into a spline shape and forming a spline portion. 4. A step of cutting an outer peripheral end portion of the annular plate portion into a predetermined size by bringing a presser pilot having a tapered surface into contact with a ridge between the annular plate portion and the cylinder portion. The method for manufacturing a clutch drum according to claim 3 , wherein cutting is performed after positioning is performed. 5. A before the step of forming the finished accuracy compressing an end surface of the tubular portion, wherein it in claim 3, characterized in that a step of forming a tapered surface at the tip of the end face Method of manufacturing clutch drum.