JP2001212641A - Preform of clutch drum for double clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a preform for forming a clutch drum capable of manufacturing at a low cost a clutch drum for a double clutch having a No.1 drum portion W1 which opens in one axial direction, a No.2 drum portion W2 which opens in the other axial direction, and a common hub portion W3 which fixes both the drum portions W1, W2. SOLUTION: A preform WF comprises a frame WFa in the air corresponding to a hub portion W3, a circular plate portion WFb which corresponds to a joint portion of both the drum portions W1, W2 and which is built up as a single piece in the periphery of the middle portion of the frame Wfa, and an annular ring portion WFc which is built up as a single piece in the periphery of the circular plate portion and which has thicker wall thickness than the circular plate portion, having a bigger cubic capacity than the total cubic volume of the peripheral walls W1a, W2a of both the drum portions W1, W2. By exerting parting of the annular ring portion WFc and by forming the peripheral walls W1a, W2a of each drum portion W1, W2 with each half portion W1a', W2a', both the drum portion W1, W2 and the hub portion W3 can be formed as a single piece.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a preform used as a material for forming a clutch drum for a double clutch in which a pair of hydraulic clutches are arranged back to back.

[0002]

2. Description of the Related Art Conventionally, as an automatic transmission for a vehicle, FIG.
As shown in FIG. 1, a first and a second pair of hydraulic clutches C1, C
It is known to incorporate a double clutch in which two are arranged back to back. In this embodiment, a first drum portion a1 for a first hydraulic clutch C1 and a second drum portion a2 for a second hydraulic clutch C2 are separately formed, and both drum portions a1 are formed.
1, a2 are welded back-to-back so that the first drum part a1 and the second drum part a2 are opened in one and the other in the axial direction, respectively. The two drum portions a1 and a2 are welded to a common hub portion b which is serrated and engaged on the power transmission shaft.

[0003]

In the above-mentioned prior art, the first and second drum portions a1 and a2 are separately formed.
Welding of the two drum parts a1 and a2 to the hub part b becomes necessary, which increases the manufacturing cost and
The concentricity of the two drum portions a1 and a2 is likely to be out of order due to thermal distortion due to welding.

In view of the above, the present invention provides a preform for manufacturing a high-precision double clutch clutch drum ensuring the concentricity of the first and second drum portions at low cost. Is an issue.

[0005]

Means for Solving the Problems In order to solve the above problems,
According to the present invention, there is provided a first drum portion that opens in one axial direction,
For forming a clutch drum for a double clutch having a second drum portion which is arranged back to back with respect to the drum portion and which opens in the other axial direction, and a common hub portion which fixes both the first and second drum portions. A preform as a material, a disc portion corresponding to a joint portion between a first shaft and a second drum portion, integrally formed on a hollow shaft portion corresponding to a hub portion and an outer periphery of an intermediate portion of the shaft portion. And formed integrally on the outer periphery of the disk part,
An annular portion having a thickness greater than that of the disk portion and having a volume equal to or greater than the total volume of the peripheral wall portions of the two drum portions.

According to the preform of the present invention, the annular portion is split in the axial direction, and the first and second drum portions are axially split at one and the other half of the split annular portion in the axial direction. The peripheral wall can be formed. Therefore, the first and second drum portions and the hub portion can be integrally formed from a single preform, so that a welding process is not required, and a high-precision double clutch for which the concentricity of both drum portions is secured. The clutch drum can be manufactured at low cost.

By the way, serration teeth for serration engagement of the hub with the power transmission shaft are formed on the inner periphery of one end of the hub. In this case, it is preferable that one end of the preform is formed in a stepped shape having a thickness greater than that of the other part so as to secure a wall for forming serration teeth at one end of the shaft.

[0008]

FIG. 1 shows a clutch drum for a double clutch. The clutch drum includes a first drum portion W1 that opens in one axial direction and a first drum portion W1.
A second drum portion W2, which is arranged back to back and opens in the other axial direction, and both first and second drum portions W1, W2
And a common hub portion W3 for fixing the same. First
And the peripheral wall portions W1a, W2a of the second drum portions W1, W2.
Of the spline teeth W1 for engaging the clutch plate
b, W2b are formed, and the spline teeth W1b, W
Ring grooves W1c and W2c for mounting a snap ring for retaining the clutch plate are formed at the end of the drum 2b on the drum opening end side. Further, the hub portion W3 includes the second drum portion W
Serration teeth W3a on the inner periphery of one end on the second side, oil holes W3b and W3b for operating the clutches opened in the first and second drum portions W1 and W2, and oil holes W3c and W3c for lubrication.
And ring grooves W3d and W3d for mounting a sealing O-ring of a clutch piston, and ring grooves W3e and W3e for mounting a snap ring for a retainer of a piston spring.
Are formed.

In manufacturing the clutch drum, first, a preform WF shown in FIG. 2A is manufactured. The preform WF corresponds to a hollow shaft portion WFa corresponding to the hub portion W3 and a joining portion of the first and second drum portions W1 and W2 integrally formed on the outer periphery of an intermediate portion of the shaft portion WFa. The total volume of the disk portion WFb and the peripheral wall portions W1a and W2a of the first and second drum portions W1 and W2, which are formed integrally with the outer periphery of the disk portion WFb and are thicker than the disk portion WFb. An annular portion WFc having the above volume is provided. The method of manufacturing the preform WF is arbitrary, for example, as shown in FIG.
The billet shown in (A) is hot-pressed as shown in FIGS. 3 (B), (C) and (D).
As shown in (1), forging is performed in a stepwise manner, and finally, a surplus portion WFa ′ in the shaft portion WFa is punched to manufacture a preform WF. Here, the serration forming portion W3 at one end of the shaft portion WFa
a 'is formed in a stepped shape thicker than other portions. For example,
As shown in FIG. 4, the other half of the shaft portion WFa (lower half).
A radial direction in which the lower die 100 for restraining the outer circumference and the half (upper half) outer circumference on one end side of the shaft portion WFa are restrained, and the inner diameter of a portion corresponding to the serration forming portion W3a 'is larger than the other portion. Using an upper die 101 composed of a plurality of split dies that can be freely opened and closed, a lower punch 102 pushed into the lower half inner periphery of the shaft WFa, and an upper punch 103 pushed into the upper half inner periphery of the shaft WFa, FIG. Shaft W from the material shown in (C)
The two halves of Fa are respectively extruded backward to a required length, and the upper end of the shaft WFa is attached to the upper punch 10 at the final stage of this molding.
3 is crushed by the shoulder 103a to form a serrated portion W3a 'having a stepped shape. After the shaft portion WFa is formed to have the same diameter over the entire length, the serration forming portion W3 is formed.
The serration forming portion W3a 'may be formed in a stepped shape by cutting the outer peripheral surface of the shaft portion other than a'.

After manufacturing the preform WF, first,
As shown in FIG. 2B, the oil hole W is formed in the shaft portion WFa by machining.
3b, W3c and a ring groove W3d are formed. Next, as shown in FIG. 2C, the serration-formed portion W of the shaft portion WFa is formed.
FIG. 2D shows a hub processing step of forming serration teeth W3a on the inner periphery of 3a 'and processing the shaft portion WFa into a shape conforming to the hub portion W3, and the annular portion WFc of the preform WF.
As shown in FIG. 2 (E), the splitting step of splitting in the axial direction as shown in FIG. 2 and the one half W1a ′ in the axial direction of the split annular portion WFc and the other half W2a ′ in the axial direction are performed as shown in FIG. 1 and the shape conforming to the peripheral wall portions W1a, W2a of the second drum portions W1, W2, that is, spline teeth W1b, W2b on the inner periphery.
And a drum machining step of machining into a cylindrical shape having a hub portion W3 and spline teeth W1b, W
2b and ring grooves W3e, W1c, W2c, respectively, and the peripheral wall portions W1a, W2 of the drum portions W1, W2.
The end on the open end side of a is cut to obtain the clutch drum shown in FIG.

The hub processing, splitting and drum processing steps are performed using a spinning machine shown in FIG.
The spinning machine comprises a headstock 2 fixed on a bed 1, a tailstock 4 supported on the bed 1 by a hydraulic cylinder 3 so as to be advanced and retracted in the X-axis direction facing the headstock 2, and a bed 1 And a movable table 5 supported by a driving source (not shown) so as to be moved in the X-axis direction. The movable table 5 supports a roller 6 for spinning on the movable table 5.
A pair of roller supports 7, 7 are arranged to face each other in the Y-axis direction orthogonal to the X-axis, and each roller support 7 is advanced and retracted in the Y-axis direction by a motor 7a via a feed screw mechanism 7b. .

The headstock 2 and the tailstock 4 have spindles 2 respectively.
a, 4a are pivotally supported, and the spindle 2a of the headstock 2
Is driven by a motor 2b on the bed 1 via a belt 2c. The spindle 2 of the headstock 2
a, as shown in FIG. 5, the shaft part WFa of the preform WF.
And a hub forming mandrel 8 having an outer tooth profile 8a corresponding to the serration teeth W3a formed on the inner circumference of the hub portion W3, and a peripheral wall portion W of the first drum portion W1.
A first drum forming mandrel 9 having an outer tooth profile 9a corresponding to the spline teeth W1b formed on the inner circumference of the first drum 1a
₁ and connected to the spindle 4a of the tailstock 4, a second drum forming mandrel 9 having a tooth 9a of the outer periphery corresponding to the spline teeth W2b that formed on the inner periphery of the peripheral wall portion W2a of the second drum portion W2 _Two are connected. The spindle 4a of the tailstock 4 is further provided with a second drum forming mandrel 9 ₂ by a hydraulic cylinder (not shown) incorporated in the spindle 4a.
, A guide pin 10 is provided which protrudes and retracts in the X-axis direction. At the tip of the guide pin 10, a center hole 10a is formed in which a center pin 8b protruding from the tip of the hub forming mandrel 8 can be fitted. Also, the guide pin 10
Is larger than the inner diameter of the shaft portion WFa of the preform WF, so that the shaft portion WFa can be pressed by the guide pin 10 in the axial direction.

In the hub processing step, as shown in FIG. 6A, after the preform WF is externally set on the hub forming mandrel 8 at the shaft portion WFa, the guide pin 10
The tailstock 4 is advanced in the X-axis direction toward the headstock 2 in a state in which the center pin 8b of the hub forming mandrel 8 is fitted into the center hole 10a of the guide pin 10, and in this state, the main spindle is rotated. While rotating the spindle 2a of the table 2, the pair of roller supports 7, 7 is advanced inward in the Y-axis direction, and the rollers 6 supported by the roller supports 7
Fa is made to contact the outer peripheral surface of Fa. Then, the roller 6 is moved in the X-axis direction by the movement of the movable base 5 toward the serration forming portion W3a 'of the shaft portion WFa, and the serration forming portion W3a'.
Is subjected to a spinning process with rollers 6. According to this, the shape of the tooth shape 8a of the hub forming mandrel 8 is transferred to the inner periphery of the serration forming portion W3a ', and the serration teeth W3a are formed.

[0014] Then, the tailstock 4 while immerses guide pin 10 relative to the second drum forming mandrels 9 ₂ advanced further in the X-axis direction, as shown in FIG. 6 (B), the preform WF The disk portion WFb is pressed from both sides in the X-axis direction by the first and second drum forming mandrels 9 ₁ and 9 ₂ , and in this state, the spindle 2 a of the headstock 2 is rotated,
Roller 6 is preformed WF by the movement of each roller support 7
In the Y-axis direction toward the annular portion WFc. According to this, the roller 6 bites into the annular portion WFc, and the annular portion WFc is split in the X-axis direction.

Next, as shown in FIG. 6C, the roller 6 is moved to one side in the X-axis direction (the headstock 2 side) by the movement of the movable base 5. According to this, one half W1a 'of the split annular portion WFc in the X-axis direction is connected to the first drum forming mandrel 9 _1.
Is spinning along the outer peripheral surface machining of the peripheral wall portion W1a of the first drum portion W1 having an inner peripheral spline teeth W1b the shape is transferred to the first drum forming mandrels 9 ₁ tooth 9a is molded.

Next, as shown in FIG. 6D, the roller 6 is moved in the X-axis direction (to the tailstock 4 side) by the movement of the movable base 5. According to this, the axial other half W2a dehiscence been ring portion WFc 'is spinning along the outer circumferential surface of the second drum forming mandrel 9 _2, the second drum forming mandrels 9 ₂ The peripheral wall portion W2a of the second drum portion W2 having the inner peripheral spline teeth W2b to which the shape of the tooth shape 9a is transferred is formed.

In the embodiment shown in FIG. 6, the hub working step, the splitting step and the drum working step are performed by using the same roller 6. However, a plurality of types of rollers can be freely mounted on the roller support base 7. The hub working step, the splitting step, and the drum working step may be performed using respective dedicated rollers.

[0018]

As is apparent from the above description, if the preform of the present invention is used, both the first and second drum portions and the hub portion can be integrally formed, so that a welding step is not required, and both A high-precision clutch drum for a double clutch that ensures the concentricity of the drum section can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a clutch drum for a double clutch manufactured using a preform of the present invention.

2A is a cross-sectional view of a preform, and FIG.
(E) The figure which shows each process which manufactures a clutch drum from a preform

FIGS. 3A to 3D show manufacturing steps of a preform.

FIG. 4 is a cross-sectional view showing a preform manufacturing apparatus.

FIG. 5 is a plan view of a spinning machine used in a clutch drum manufacturing process.

6A is a diagram showing a hub machining process, FIG. 6B is a diagram showing a split process, FIG. 6C is a diagram showing a machining process of a first drum portion, and FIG. 6D is a diagram showing a machining process of a second drum portion.

FIG. 7 is a sectional view showing a double clutch using a clutch drum manufactured by a conventional method.

[Explanation of symbols]

 W1 First drum section W2 Second drum section W3 Hub section WF Preform WFa Shaft section WFb Disc section WFc Annular section W3a Serration teeth W3a 'Serration forming section (one end of shaft section)

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Masahiko Yamauchi 1-10-1 Shinsayama, Sayama City, Saitama Prefecture Inside Honda Engineering Co., Ltd. (72) Inventor Nobuaki Hojo 1-10-1 Shinsayama, Sayama City, Saitama Prefecture Hong Within Koda Engineering Co., Ltd. (72) Inventor Kono Matsumoto 1-10-1, Shinsayama, Sayama-shi, Saitama F-Term within Honda Engineering Co., Ltd. (Reference) 3J057 AA04 AA09 BB04 CA01 DA18 FF03 FF07 HH02 JJ04 4E087 CB01 HA11

Claims (2)

[Claims] A first drum portion that opens in one axial direction;
A clutch clutch drum for a double clutch is formed which has a second drum portion which is disposed back-to-back with respect to the first drum portion and which opens in the other axial direction, and a common hub portion which fixes both the first and second drum portions. A hollow shaft portion corresponding to a hub portion, and a circle corresponding to a joint portion of the first and second drum portions formed integrally with an outer periphery of an intermediate portion of the shaft portion. A double clutch, comprising: a plate portion; and an annular portion formed integrally with the outer periphery of the disc portion and having a thickness greater than the disc portion and having a volume equal to or greater than the total volume of the peripheral walls of both drum portions. Preforms for clutch drums. 2. A preform for a clutch drum for a double clutch, wherein one end of said shaft portion is formed in a stepped shape having a greater thickness than another portion.