JPH0791544A - Clutch drum for automatic transmission - Google Patents

Abstract

PURPOSE:To shorten the groove processing time, and to eliminate the burring work by forming a narrow part in the edge of an opening of a projecting part of the peripheral wall, of which inner peripheral surface is provided with gear- like projecting and recessed parts, and forming installation grooves in this narrow part with pressing. CONSTITUTION:In a clutch drum 10, plural spline grooves 10d are formed on the inner peripheral surface of the peripheral wall 10c in the axial direction with a predetermined space along the circumferential direction, and these spline grooves 10d form a gear, in which recessed parts and projecting parts are alternately and continuously formed, on the inner peripheral surface of the peripheral wall 10c. A clutch plate 3 and a piston 4 are arranged inside of this clutch drum 10. In this case, a narrow part 10h is formed in the edge of an opening of the projecting parts 10e, and installation grooves 10f are formed in this narrow part by pressing. Generation of burr is thereby eliminated in the periphery of the grooves, and at the time of engaging the clutch plate 3 with the projecting and recessed parts, the narrow part 10h functions as a guide for engagement to facilitate the fitting work.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch drum for an automatic transmission, and more particularly to a technique for improving its assemblability.

[0002]

2. Description of the Related Art Recently, a relatively large number of automobiles equipped with an automatic transmission instead of a manual transmission have been produced. Such automatic transmissions for automobiles have a wet type. A plate clutch device is provided. As a kind of this type of clutch device, for example, one having a structure as shown in FIG. 7 is known. In the figure, reference numeral 1 denotes a clutch drum, and this clutch drum 1 is, for example, a metal plate that is pressed so that the overall shape is a substantially hollow cylindrical shape. On the periphery, cylindrical inner and outer peripheral wall portions 1b and 1c are concentrically arranged and are formed upright.

A plurality of spline grooves 1d are axially formed on the inner peripheral surface of the outer peripheral wall portion 1c at intervals along the peripheral direction, and the inner peripheral surface of the outer peripheral wall portion 1c is formed by the spline grooves 1d. The concave portions (spline grooves) 1d and the convex portions 1e are in the form of a gear that is alternately continuous. A clutch plate 3 and a piston 4 are arranged inside the clutch drum 1. The clutch plate 3 includes a plurality of driven plates 3a having concave and convex teeth formed on the outer peripheral portion thereof, and a plurality of drive plates 3b arranged between the driven plates 3a and having concave and convex teeth formed on the inner peripheral portion thereof. The driven plate 3a is mounted so as to fit into the concave and convex portions 1d and 1e of the drum 1.

A retaining plate 5 is fitted on the outer side of the clutch plate 3, and a snap ring 6 is arranged on the outer side thereof. Snap ring 6
It is fitted in a concave mounting groove 1f provided in the convex portion 1e of the drum 1, and has a function of positioning the clutch plate 3 and the like, and a function of preventing the clutch plate 3 from falling off. By the way, in the clutch device having such a structure, the snap ring 6 is conventionally used.
The mounting groove 1f such as was formed by cutting,
Such groove processing means has the technical problems described below.

[0005]

That is, the mounting groove 1f
Since the convex portion 1e is formed intermittently when forming the groove by cutting, the cutting of the groove 1f is also intermittent cutting,
There was a problem that the cutting conditions were strict, the cutting speed was very low, and the processing took a long time. Further, when the mounting groove 1f is formed by cutting, burrs are generated around the formed groove 1f, and if the mounting groove 1f is left as it is, the fitting of the clutch plate 3 or the like is hindered. There is also a problem that it takes time to assemble the clutch device.

The present invention has been made in view of such conventional problems, and an object of the present invention is to shorten the groove processing time and eliminate the deburring work.
An object of the present invention is to provide a clutch drum for an automatic transmission, which can shorten the assembly time and ensure the ease of assembly work.

[0007]

In order to achieve the above object, the present invention comprises a cylindrical inner and outer peripheral wall portion arranged concentrically, and a predetermined distance in the circumferential direction on the inner peripheral surface of the outer peripheral wall portion. To form a spline groove to provide a gear-shaped uneven portion,
With a plurality of clutch plates mounted on the inner peripheral side of the outer peripheral wall, the outer peripheral wall is positioned on the outer side of the clutch plate and has a ring shape such as a snap ring on the inner peripheral surface of the convex portion of the outer peripheral wall. In a clutch drum for an automatic transmission provided with a mounting groove for a member, a narrow portion is formed on an opening edge side of a convex portion of the outer peripheral wall portion, and the mounting groove is formed in the narrow portion by press working. It is characterized by

The narrow portion can be formed in a taper shape in which the width is temporarily narrowed toward the opening end side of the convex portion.

[0009]

According to the clutch drum having the above structure, since the mounting groove for the ring-shaped member such as the snap ring is formed by press working, burrs do not occur around the groove and the working time is shortened. In addition, since the narrow portion is provided in the convex portion where the mounting groove is formed and the mounting groove is formed in this narrow portion by press working, even if swelling occurs due to press working, this will not occur. It is possible to prevent an obstacle when mounting a clutch plate or the like.

Further, since the narrow portion is formed on the opening edge side of the convex portion, this narrow portion functions as a fitting guide when the clutch plate or the like is fitted to the uneven portion,
The fitting work becomes very easy. Furthermore, the clearance between the clutch plate and the concavo-convex portion into which they are fitted is a cause of noise, so it is desirable that it be as small as possible. Even if the clearance is very small, the assemblability does not deteriorate.

Further, according to the second aspect of the invention, since the narrow portion is formed in a taper shape in which the width is temporarily narrowed toward the opening end side of the convex portion, the work of fitting the clutch plate or the like is further facilitated. It will be easier.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. 1 to 6 show an embodiment of a clutch drum for an automatic transmission according to the present invention. In the following description, the same or corresponding parts as those of the above-described conventional example are designated by the same reference numerals. Figure 1
FIG. 3 is a cross-sectional view of a wet multi-plate clutch device using a clutch drum according to the present invention, and this clutch device has a clutch drum 10.

The clutch drum 10 is, for example, a metal plate that is pressed so that the overall shape is a substantially hollow cylindrical shape, and is concentrically arranged on the inner and outer peripheral edges of the ring-shaped main body 10a. Circumferential inner and outer peripheral wall portions 10b, 10c
Are formed upright. On the inner peripheral surface of the outer peripheral wall 10c,
A plurality of spline grooves 10d are formed in the axial direction at predetermined intervals along the circumferential direction.
Due to d, the inner peripheral surface of the outer peripheral wall portion 10c has a gear shape in which concave portions (spline grooves 10d) and convex portions 10e are alternately continuous.

A mounting groove 10f for the snap ring 6 is formed on the convex portion 10e. This groove 10
f is a convex portion 10e that alternates with the concave portion 10d in the circumferential direction.
It is provided only in the area and is divided by the recess 10d. Inside the clutch drum 10, a clutch plate 3 and a piston 4 are arranged. The clutch plate 3 includes a plurality of driven plates 3a having concave and convex teeth formed on the outer peripheral portion, and a plurality of drive plates 3b arranged between the driven plates 3a and having concave and convex teeth formed on the inner peripheral portion. Consists of
Driven plate 3a and retaining plate 5
Are mounted so as to fit into the concave and convex portions 10d and 10e of the drum 10.

The clutch plate 3 thus constructed
Is mounted on the inner peripheral side of the outer peripheral wall portion 10c of the clutch drum 10, and is positioned by fitting the snap ring 6 in the mounting groove 10f located on the outer side thereof. The basic configuration of the clutch device as described above is the same as the conventional device described above, but in the device of the present embodiment,
In particular, the structure of the clutch drum 10 has the salient features described below. That is, the clutch drum 1 of this embodiment
At 0, as shown in detail in FIGS.
A narrow portion 10h is formed on the opening edge side of the convex portion 10e provided on the inner periphery of c, and the mounting groove 1 is formed in the narrow portion 10h.
0f is formed by press working.

In this embodiment, the narrow portion 10h is formed stepwise with respect to the convex portion 10e, and the convex portion 10h is formed.
In order to gently connect e and the narrow portion 10h, a tapered portion 10g is formed between them. Mounting groove 1
The processing state when 0f is formed by press working is shown in FIG. When the mounting groove 10f is formed by press working, a punch 12 having a groove width and a groove length of the groove 10f to be formed and a die 14 having a recess corresponding to the punch 12 are used. 12 and die 1
It is formed by sandwiching the narrow portion 10h between the punch 12 and the punch 4 and pressing the punch 12 toward the die 14 side.

At this time, the plastic flow of the material causes swelling on the surface side of the outer peripheral wall portion 10c and the side surface side of the mounting groove 10f. However, in the case of this embodiment, the narrow portion 1
Since 0h has a width narrower than that of the convex portion 10e in advance, even if a bulge occurs on the side surface side, it does not become larger than the width of the convex portion 10e. That is,
The width of the narrow portion 10h is set so that, even if a rise occurs on the side surface side, it does not become larger than the width of the convex portion 10e in consideration of the rise of the material when the mounting groove 10f is formed by pressing. It is set.

The bulge generated on the surface side of the outer peripheral wall portion 10c may be removed if necessary. Now, according to the clutch drum 10 configured as described above, the mounting groove 10f of the ring-shaped member such as the snap ring 6 is
Since it is formed by press working, burrs do not occur around the groove 10f, the deburring work is unnecessary, and the working time is shorter than the cutting work.

Further, the convex portion 10 in which the mounting groove 10f is formed
e is provided with a narrow portion 10h, and the narrow portion 1h
Since the mounting groove 10f is formed at 0h by press working,
Even if swelling occurs due to the press working, it is prevented that this becomes an obstacle when the clutch plate 3 and the like are mounted. Further, since the narrow portion 10h is formed on the opening edge side of the convex portion 10e, when the clutch plate 3 and the like are fitted to the concave and convex portions 10d and 10e, the narrow portion 1h is formed.
0h functions as a guide for fitting, which makes fitting work very easy.

Furthermore, with the clutch plate 3 and the like,
The clearance between the concave and convex portions 10d and 10e, into which these are fitted, is a cause of noise, and therefore it is desirable that the clearance be as small as possible. Assemblability is very poor. However, in the clutch drum 10 of the present embodiment, the narrow portion 10h is provided on the opening edge side of the convex portion 10e.
As a result, the assembling property does not deteriorate even if the clearance of the convex portion 10e is extremely reduced, and the assembling workability is ensured satisfactorily, and at the same time, the generation of noise can be significantly reduced. .

FIG. 7 shows another embodiment of the clutch drum according to the present invention, and only the characteristic points will be described below. In the embodiment shown in the figure, the narrow width portion 10h 'provided on the opening edge side of the convex portion 10e is formed in a taper shape in which the width is temporarily narrowed toward the opening end side of the convex portion 10e. When the narrow portion 10h 'is formed in such a shape,
Clutch plate 3 along the taper of narrow portion 10h '
And the like, the work of fitting the clutch plate 3 and the like becomes easier.

[0022]

As described above in detail in the embodiments,
According to the clutch drum for an automatic transmission according to the present invention,
The groove processing time can be shortened and the deburring work can be eliminated, and the assembling time can be shortened and the assembling work can be facilitated.

[Brief description of drawings]

FIG. 1 is a sectional view showing a clutch device using a clutch drum according to the present invention.

FIG. 2 is a perspective view showing an embodiment of a clutch drum according to the present invention.

FIG. 3 is a top view of a main part of FIG.

FIG. 4 is an enlarged view of a main part of FIG.

5 is a cross-sectional view of the main parts of FIG.

FIG. 6 is an explanatory view of a processed state when forming a groove with the clutch drum of the present invention.

FIG. 7 is a perspective view of a main part showing another embodiment of the clutch drum according to the present invention.

FIG. 8 is a sectional view showing an example of a conventional clutch device.

[Explanation of symbols]

 3 Clutch plate 6 Snap ring 10 Clutch drum 10a Body part 10b Inner peripheral wall part 10c Outer peripheral wall part 10d Spline groove 10e Convex part 10f Mounting groove 10g Tapered part 10h Narrow part

Claims (2)

[Claims] 1. A concentric cylindrical inner and outer peripheral wall portion is provided, and spline grooves are formed at predetermined intervals in a circumferential direction on an inner peripheral surface of the outer peripheral wall portion to form a gear-shaped uneven portion. Provided,
With a plurality of clutch plates mounted on the inner peripheral side of the outer peripheral wall, the outer peripheral wall is positioned on the outer side of the clutch plate and has a ring shape such as a snap ring on the inner peripheral surface of the convex portion of the outer peripheral wall. In a clutch drum for an automatic transmission provided with a mounting groove for a member, a narrow portion is formed on the opening edge side of the convex portion of the outer peripheral wall portion, and the mounting groove is formed in the narrow portion by press working. A clutch drum for an automatic transmission, which is characterized in that 2. The clutch drum for an automatic transmission according to claim 1, wherein the narrow portion is formed in a taper shape in which the width is temporarily narrowed toward the opening end side of the convex portion.