JP2013007473A - Method for manufacturing separator plate and core plate, and wet-type multiple disc clutch using separator plate and core plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a separator plate and a core plate reduced in warping.SOLUTION: The method for manufacturing an annular separator plate having an axially penetrating through-hole on the inner periphery and provided with a plurality of splines on the outer periphery includes punching through a plate and annularly forming a plurality of the holes of complementary shape to the shape of the splines; punching through the plate and forming the through-hole inside the plurality of annular holes; and annularly punching through the plate between the radial outer edge and inner edge of the annular holes to take out the separator plate.

Description

  The present invention relates to a separator plate and a core plate manufacturing method used for a wet multi-plate clutch and the like, and a wet multi-plate clutch using the separator plate and the core plate.

  An annular separator plate is used as a driven plate of a friction engagement device such as a wet multi-plate clutch. An annular core plate is used as the drive plate. The separator plate to which the friction material is not fixed is provided with a through hole penetrating in the axial direction on the inner periphery, and a plurality of splines are provided on the outer periphery. The core plate is used as a friction plate having a friction material fixed on the surface in the axial direction, and has an annular outer periphery, and a plurality of splines are provided on the inner periphery. Conventionally, such a separator plate or core plate is formed by pulling the shape of the separator plate or core plate at once from a plate material.

  However, when the separator plate or the core plate is formed by a single punching process, the plate material is warped. For this reason, when used in a wet multi-plate clutch, the warpage of the separator plate or the core plate causes uneven contact between the plates, causing judder, which may affect the operation of the wet multi-plate clutch.

  In addition, when punching the separator plate or core plate with a punch and a die, curved convex portions and curved concave portions are continuously arranged on the circumference around the spline. Is likely to occur. In order to prevent the occurrence of burrs, it is conceivable to reduce the clearance at the corners R of each corner. However, if the clearance is reduced, the wear of the mold tends to progress, resulting in a problem that the mold is consumed. .

  Accordingly, an object of the present invention is to provide a method for manufacturing a separator plate and a core plate that reduces warpage, suppresses the generation of judder, and increases the torque capacity.

In order to achieve the above object, the method for producing the separator plate of the present invention comprises:
A method of manufacturing an annular separator plate having a through hole penetrating in the axial direction on the inner periphery and provided with a plurality of splines on the outer periphery,
Punching a steel plate and forming a plurality of holes having a shape complementary to the shape of the spline in an annular shape;
Punching out the plate material, forming the through hole inside the annular plurality of holes,
Between the radially outer edge and the inner edge of the plurality of holes, punching the plate material in an annular shape, and taking out the separator plate;
It is characterized by having.

In addition, in order to achieve the above object, the core plate manufacturing method of the present invention includes:
A method of manufacturing an annular core plate having a substantially annular outer periphery and having a plurality of splines on the inner periphery,
Punching a plate material and forming a plurality of holes having a shape complementary to the shape of the spline in an annular shape;
Punching the plate material, forming the annular outer periphery radially outward of the plurality of holes;
Between the radially outer edge and the inner edge of the plurality of holes, punching the plate material in an annular shape, and taking out the core plate;
It is characterized by having.

According to the present invention described above, the following effects can be obtained.
Since the punching of the spline and the through hole is separated as a separate process rather than once, the warpage generated in the formed separator plate and core plate can be reduced.

  In addition, between the radially outer edge and the inner edge of the hole arranged in an annular shape, the plate material is punched in an annular shape and the separator plate and the core plate are taken out, so there is no R portion (curved surface portion) of the tooth tip, The tooth lateral area is secured, contributing to an increase in torque capacity. Moreover, since it cuts out by the notch on a periphery, a curved surface part becomes a convex part and a burr | flash is suppressed. As a result, it becomes a cause of judder generation and contributes to stabilization of the overall clutch clearance that affects the clutch response.

  In addition, the design can be improved as compared with the prior art, and the effect of facilitating differentiation in appearance can be expected.

It is a front view of the board | plate material which shows the 1st process of the manufacturing method of the separator plate of this invention. It is a front view of the board | plate material which shows the 2nd process of the manufacturing method of the separator plate of this invention. It is a front view of the board | plate material which shows the 3rd process of the manufacturing method of the separator plate of this invention. It is a front view of the separator plate manufactured by the manufacturing method of the separator plate of this invention. FIG. 4 is a front view of the hole shown in FIGS. 1 to 3. It is an axial direction fragmentary sectional view of the wet multi-plate clutch in which the separator plate and core plate of the present invention were used.

BEST MODE FOR CARRYING OUT THE INVENTION

  In the present invention, the punching of the spline and the through-hole is not performed in a single process, but is separated and punched in a separate process, so that the warpage generated in the formed separator plate and core plate can be reduced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same portions are described with the same reference numerals. In addition, it is needless to say that the embodiments described below are intended to illustrate the present invention and not to limit the present invention.

  1 to 4 are front views showing a method for manufacturing a separator plate according to the present invention. FIG. 1 shows the first step, in which a plurality of holes 2 penetrating in the axial direction are punched into a prepared blank plate material, that is, a steel plate 1 by punching. The plurality of holes 2 are formed in an annular shape (circular shape) at the same pitch in the circumferential direction as shown in FIG. Pierced holes 70 for punch alignment are provided through predetermined positions of the steel plate 1 (center positions of the plurality of holes 2 arranged in an annular shape).

  FIG. 5 is an enlarged view of the hole 2 shown in FIGS. 1 to 3. The hole 2 has a trapezoidal shape, and includes an inner edge, that is, an upper base 9, and an outer edge that is parallel to the upper base 9 and longer than the upper base 9, that is, a lower base 10. The four corners of the trapezoid are each formed as a curved surface. The corner 5 and the corner 6 are formed as curved surfaces having the same curvature, and the corner 7 and the corner 8 are also formed as curved surfaces having the same curvature.

  The curvatures of the corners 5 and 6 are larger than the curvatures of the corners 7 and 8. As can be seen from the process described later, the corners 7 and 9 correspond to the corners of the valleys of the splines 12 formed in the separator plate 30 (FIG. 4). The half of the hole 2 on the upper bottom 9 side has a shape complementary to the shape of the spline 12.

  After the first step in FIG. 1, the second step shown in FIG. 2 is performed. Here, the through-hole 3 in the axial direction, which is a circular hole having the same center as the annular hole 2 formed in the first step, is punched out by punching or pressing. Thus, since the first step of punching out the holes 2 for forming the splines and the second step of punching out the through holes 3 are not performed simultaneously, but are performed separately as separate steps, the warp generated in the formed separator plate. Can be reduced.

  After the first step and the second step, the third step shown in FIG. 3 is performed. In FIG. 3, the steel plate 1 is punched out annularly along the annular line 4 between the radially outer edge and the inner edge of the plurality of holes 2 arranged in an annular shape, and the separator plate 30 is taken out from the steel plate 1. Punching is performed by pressing or punching. The separator plate 30 thus taken out is shown in FIG. 4 and has a shape in which the spline 12 is provided on the outer periphery of the annular main body 13 and the through hole 3 is provided on the inner periphery. The line 4 is preferably located in the middle in the radial direction of the plurality of holes 2.

  In FIG. 3, since the punch and die for punching the outline of the line 4 use a simple circular die having a predetermined clearance, the cost can be reduced because it is cheaper than a conventional tool for punching a large-diameter spline. Become. Moreover, the outline of the line 4 is punched with a punch in the same direction as the hole 2, so that the hole 2 has a die reference dimension with respect to the punch reference dimension, and the punched surface has a contour in which the shearing surface is replaced. Can do. As a result, the sagging direction associated with punching is arranged vertically, thereby canceling deformation caused by punching and contributing to improvement in flatness. When the line 4 is punched out, a flat product can be obtained by stripping with an appropriate pressure as in the case of the hole 2 and the through hole 3.

  In the above embodiment, the method for manufacturing the separator plate has been described. However, the present invention can also be used to manufacture an annular core plate having a substantially annular outer periphery and provided with a plurality of splines on the inner periphery. . The configuration of the hole 2 in FIG. 5 is changed so that the trapezoid is reversed in the radial direction, the lengths of the upper bottom portion 9 and the lower bottom portion 10 are reversed, and the lower bottom portion 10 is shorter than the upper bottom portion 9. For the other steps, the above method can be applied in the same manner.

  FIG. 6 is an axial partial cross-sectional view of a wet multi-plate clutch of a wet multi-plate clutch using the separator plate and the core plate of the present invention. The wet multi-plate clutch 50 includes a clutch housing 51, an axially movable piston 53 that is oil-tightly fitted to a closed end portion of the clutch housing 51 by an O-ring 54, and a plurality of fittings fitted to the hub 52 by splines. The friction plates, that is, the friction plates 57, and the separator plates 56 that are alternately arranged with the friction plates 57 and are fitted to the spline portions 55 provided on the inner periphery of the clutch housing 51 are provided.

  A backing plate 58 fixed by a stopper ring 59 is provided at the open end of the clutch housing 51. Each friction plate 57 is formed by adhering and fixing the friction material 61 to both axial surfaces of the core plate made by the manufacturing method of the present invention.

  The wet multi-plate clutch 50 performs an engagement / release operation as follows. FIG. 6 shows the released state of the wet multi-plate clutch 50. The piston 53 moves to the right in FIG. 6 by the hydraulic pressure generated by the oil supplied to the oil chamber 60 defined between the closed end portion of the clutch housing 50 and the piston 53.

  When the piston 53 moves in the axial direction to the right in the figure, it abuts against the separator plate 56 and further moves while pressing it. Finally, all the separator plates 56 and the friction plates 57 are sandwiched and pressed between the backing plates 58 and engaged. As a result, the wet multi-plate clutch 50 is engaged, and power can be transmitted. Next, by releasing the hydraulic pressure in the oil chamber 60, the piston 53 is returned to the initial position by a return spring (not shown), and the wet multi-plate clutch 50 returns to the released state.

  The separator plate of the present invention is used for a wet multi-plate clutch disposed between friction plates. Further, the core plate of the present invention can be used in a wet multi-plate clutch as a friction plate having a friction material fixed on both sides or one side in the axial direction.

1 Steel plate 2 Hole 3 Through hole 4 Line 12 Spline 30 Separator plate 50 Wet multi-plate clutch

Claims (5)

A method of manufacturing an annular separator plate having a through hole penetrating in the axial direction on the inner periphery and provided with a plurality of splines on the outer periphery,
Punching a plate material and forming a plurality of holes having a shape complementary to the shape of the spline in an annular shape;
Punching out the plate material, forming the through hole inside the annular plurality of holes,
Between the radially outer edge and the inner edge of the plurality of holes, punching the plate material in an annular shape, and taking out the separator plate;
The manufacturing method of the separator plate which has this.   A wet multi-plate clutch using a separator plate manufactured by the manufacturing method according to claim 1. A method of manufacturing an annular core plate having a substantially annular outer periphery and having a plurality of splines on the inner periphery,
Punching a plate material and forming a plurality of holes having a shape complementary to the shape of the spline in an annular shape;
Punching the plate material, forming the annular outer periphery radially outward of the plurality of holes;
Between the radially outer edge and the inner edge of the plurality of holes, punching the plate material in an annular shape, and taking out the core plate;
The manufacturing method of the core plate which has this.   A wet multi-plate clutch using a core plate manufactured by the manufacturing method according to claim 3.   A wet multi-plate clutch using a separator plate manufactured by the manufacturing method of claim 1 and a core plate manufactured by the manufacturing method of claim 3.

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