JPH07136721A - Production of carrier - Google Patents

Abstract

PURPOSE:To provide a method for producing a carrier by which rising of working cost is prevented and the highly strong carrier is press formed. CONSTITUTION:A base material 5 for carrier is blanked so plural tongue like leg parts 3 are positioned having equal interval between them on the outer circumference 2a of a hollow disk like carrier main body 2 and both side surfaces 3a of root parts 3b of leg parts 3 and the outer circumference 2a of carrier main body 2 are connected with a smooth curve. An inner circumference having about equal diameter to the outer circumference 2a of carrier main body 2 is formed on a die which is used for press forming the base material 5 for carrier. The outer circumference 7a engaging with the inner circumference of die with a little clearance between them is formed on a punch 7 and leg part receiving parts 8 with grooves having equal depth to the thickness of leg parts 3 are formed on the outer circumference 7a corresponding to the leg parts 3. The leg parts 3 of base material 5 for carrier are bent to be housed by the leg part receiving parts 8 of punch 7 using the die and punch 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a carrier which constitutes a planetary gear unit used in an automatic transmission or the like.

[0002]

2. Description of the Related Art Generally, a planetary gear device is used for an automatic transmission of an automobile, and the planetary gear device includes a ring gear, a sun gear, a pinion meshing with the ring gear and the sun gear, and a carrier supporting the pinion. It is configured.

FIG. 10 shows a carrier 1 of such a planetary gear device. The carrier 1 is composed of a hollow disk-shaped carrier body 2 that supports a pinion support shaft, and a plurality of tongue-shaped legs 3 that extend axially from the outer peripheral end of the carrier body 2.

As shown in FIG. 11, the carrier 1 has a plate-like blank (a blank so that a plurality of tongue-shaped legs 3 are located at equal intervals on the outer circumference of a hollow disk-like carrier body 2). The carrier material 5 is punched out from (not shown). After that, the legs 3 of the carrier material 5 are bent using a die and a punch as shown in FIGS. 10 and 12 to 13 to form the carrier 1.

The leg portion 3 is bent and formed by pressing, but in the conventional carrier 1, as shown in FIG. 12, the outer diameter R ₁ of the carrier body 2 is larger than the inner diameter R _{2 of the} leg portion. During this bending, abrupt pulling force and compressive force act on the carrier body 2 and the leg portions 3 near the bent portions. Therefore, the conventional carrier 1 relaxes the tensile force and the compressive force acting in the vicinity of the bent portion and prevents the bent portion from being damaged by cracks or the like, so that the leg portion 3 and the carrier 2 are connected to each other. The notch 11 is formed so that the leg can be easily bent (Jitsuko Sho 61).
-19225).

[0006]

However, such a conventional carrier 1 is subject to a large shearing force or the like from the support shaft of the pinion (the hole 4 portion with which the support shaft is engaged) which acts during power transmission. It has been pointed out that due to this, stress concentration occurs in the vicinity of the notch 11 and a crack may be generated from the notch 11 toward the inside of the carrier body 2 in the radial direction.

In order to solve such a problem,
A method of manufacturing a carrier having a desired shape by cutting a forging material can be considered, but this method causes a new problem that the processing cost becomes high.

Therefore, an object of the present invention is to provide a manufacturing method capable of molding a high-strength carrier without causing an increase in processing cost.

[0009]

The present invention has been devised in view of the above-mentioned problems of the prior art, and has a plurality of tongue-shaped members on the outer periphery (2a) of the hollow disk-shaped carrier body (2). The carrier material (5) is formed so that the legs (3) of the carrier are radially provided, and the legs (3) of the carrier material (5) are bent by the die (6) and the punch (7) to obtain a desired shape. In the method of manufacturing a carrier (1), a side surface (3a) of the leg (3) and an outer circumference (2a) of the carrier body (2).
The carrier material (5) is punched and molded so as to be connected with a smooth curve, and the die (6) has an inner peripheral surface (6) having substantially the same diameter as the outer periphery (2a) of the carrier body (2).
On the other hand, the punch (7) is formed with an outer peripheral surface (7a) which engages with the inner peripheral surface (6a) of the die (6) with a slight clearance, and the outer peripheral surface (a) is formed. 7
A leg receiving portion (8) having a groove depth substantially the same as the plate thickness of the leg portion (3) is formed in a) corresponding to the leg portion (3), and these dies (6) and punches (7) are formed. By said carrier material (5)
The leg portions (3) are bent and formed so as to be accommodated in the leg receiving portions (8).

The reference numerals in parentheses are for comparison with the drawings, but do not limit the structure of the present invention.

[0011]

As described above, according to the present invention, the side surface of the leg portion of the carrier material and the outer periphery of the carrier body are connected by a smooth curve to improve the bending rigidity of the root portion of the leg portion to be bent and formed. By increasing the size and accommodating the bent leg portion in the leg receiving portion provided on the punch so that the leg portion can be smoothly bent, the compressive force and the pulling force acting at the time of bending and forming can be applied to the leg portion. Since it can be relaxed at the root portion and defects such as defective deformation and cracks in the bent portion can be prevented, it is possible to manufacture a carrier capable of performing stable power transmission for a long period of time. In addition, according to the present invention, since the carrier can be press-molded, the processing cost does not increase.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a carrier 1 showing an embodiment of the present invention. As shown in this figure, a plurality of tongue-shaped leg portions 3 are formed on the outer peripheral end of the hollow disk-shaped carrier body 2 at equal intervals in the circumferential direction. The side surface 3a of the leg portion 3 and the outer circumference 2a of the carrier body 2 are connected by a smooth curve. Further, the hollow disk-shaped carrier body 2 is provided with a plurality of holes 4 for engaging a pinion support shaft (not shown).

The carrier 1 having such a shape is manufactured as follows.

First, a carrier blank 5 having a shape as shown in FIG. 2 is punched out from a plate blank (not shown) by a press. This carrier material 5 has a plurality of tongue-shaped legs 3 arranged at equal intervals on the outer periphery of the hollow disk-shaped carrier body 2 and increases the rigidity of the root portion 3b of the legs 3.
The side surfaces 3a of the leg portion 3 and the outer periphery 2a of the carrier body 2 are punched so as to be connected by a smooth curve (for example, R5 to R20).

Next, the carrier material 5 is applied to the structure shown in FIGS.
Inserted between the die 6 and punch 7 shown in
The legs 3 of the carrier material 5 are bent by the punch 7 (see FIGS. 1, 8 and 9). The die 6 is formed with an inner peripheral surface 6a having a diameter substantially the same as the outer diameter of the carrier body 2.
On the other hand, the punch 7 that engages with the die 6 is formed with an outer peripheral surface 7a that engages with the inner peripheral surface 6a of the die 6 with a slight gap, and the outer peripheral surface 7a corresponds to the leg portion 3 of the carrier material 5. Then, the leg receiving portion 8 is formed. As shown in detail in FIG. 5, the leg receiving portion 8 of the punch is formed to have a groove depth similar to the plate thickness of the leg portion 3, and the width dimension W ₁ of the groove bottom portion is set to the leg portion 3. Formed to have a width dimension W _{0 of}
The connection point P between the leg 3 and the carrier body 2 is connected to the circumferential end of the groove bottom 8a by a smooth rising wall 8b having a flat or curved surface.

As shown in FIG. 3, the radius of the curved surface of the inner peripheral edge 6b of the die 6 is set to be smaller than the conventional radius (the radius of the conventional R10 is defined as R5), while the groove of the punch 7 is formed. The radius of the curved surface of the bottom end edge 8c is set to 1/2 (R2.5) of the curved surface radius on the side of the die 6 (see FIGS. 5 to 6).
(Refer to FIG. 7), the defective bending portion 3c as shown in FIG. 7 is prevented from occurring. Further, by setting the curved surface radius of the outer peripheral edge 7b of the punch 7 to 0.5R (see FIGS. 5 to 6), the contact area between the punch 7 and the carrier material 5 is widened and the flatness of the carrier body 2 is increased. I try to improve. Furthermore. The rising wall end edge 8d of the punch 7 is formed so as to have a curved surface radius (R4) larger than the other parts of the punch 7, and steps are formed on the curved surfaces of the groove bottom end edge 8c, the outer peripheral edge 7b and the rising wall end edge 8d. By smoothly connecting the carrier material 5 so that it does not cause bending, when the leg portion 3 of the carrier material 5 is bent, the root portion 3 of the leg portion 3 is bent.
b does not interfere with the punch 7. In addition, a recess 9a is formed in the center of the end surface of the knockout plate 9.
Is formed to increase the contact pressure between the knockout plate 9 and the carrier material 5 when the legs 3 of the carrier material 5 are bent and formed. In this embodiment, the punch 7 is used.
A detent pin 10 is fixed to the end face of the carrier material 5, and the detent pin 10 is engaged with the hole 4 of the carrier material 5 to position the carrier material 5 with respect to the punch 7.

By press-forming the carrier material 5 with the die 6, punch 7 and knock plate 9 thus formed, the legs 3 of the carrier material 5 can be smoothly bent. When the legs 3 are bent, Since the generated compressive and tensile stresses can be relaxed by the root portion 3b of the leg portion 3, defects such as defective deformation and cracks in the bent portion can be effectively prevented. Therefore, the carrier 1 molded by the manufacturing method of this embodiment does not generate cracks due to stress concentration during power transmission, and can support the pinion and transmit power for a long time.

In addition, in this embodiment, since the carrier 1 can be manufactured only by press molding, the carrier 1 can be formed at a lower cost than the method of forming the carrier 1 by cutting the carrier material 5 after forging. It can be manufactured.

In the above embodiment, the radius of curvature of the root portion 3b of the carrier material 5, the die 6 and the punch 7 are used.
The above numerical values are merely examples, and are appropriately set depending on the outer diameter dimension of the carrier 1, the plate thickness, the width dimension of the leg portion 3, and the like, and do not limit the present invention in any way.

The carrier 1 of the present invention is also used as a Simpson type carrier, but in the case of the Simpson type carrier, a pinion (not shown) is incorporated from between the leg portions 3, 3, so that the pinion is a leg portion. The shape (curved shape) of the root portion 3b of the leg portion 3 is determined so as not to interfere with No.

[Brief description of drawings]

FIG. 1 is a perspective view of a carrier showing an embodiment of the present invention.

FIG. 2 is a plan view of the carrier material.

FIG. 3 is a molding state diagram of the carrier material.

FIG. 4 is a front view of the tip of the punch.

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

6 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 7 is a molding failure state diagram.

FIG. 8 is a front view of the carrier.

9 is a sectional view taken along the line BB of FIG.

FIG. 10 is a perspective view of a conventional carrier.

FIG. 11 is a plan view of the carrier material.

FIG. 12 is a front view of the carrier.

FIG. 13 is a cross-sectional view taken along line CC of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 carrier 2 carrier main body 2a outer circumference 3 legs 3a side surface 5 carrier material 6 die 6a inner peripheral surface 7 punch 7a outer peripheral surface 8 leg receiving portion

Front page continuation (72) Inventor Akihiro Kuroyanagi 10 Takane, Fujii-cho, Anjo City, Aichi Prefecture Aisin AW Co., Ltd. (72) Hiroshi Kato 10 Takane, Fujii-cho, Anjo City, Aichi Prefecture Aisin Ai W Co., Ltd.

Claims (1)

[Claims] 1. A carrier material is punched and molded so that a plurality of tongue-shaped legs are radially provided on the outer periphery of a hollow disk-shaped carrier body, and the legs of the carrier material are bent by a die and a punch to obtain a desired shape. In the method of manufacturing a carrier in the shape of, the carrier material is molded so that the side surface of the leg portion and the outer circumference of the carrier body are connected with a smooth curve, and the die is substantially the same as the outer circumference of the carrier body. While forming an inner peripheral surface having a diameter, the punch has an outer peripheral surface that engages with the inner peripheral surface of the die with a slight clearance, and the outer peripheral surface has substantially the same plate thickness as the leg portion. Is formed corresponding to the leg portion, and the leg portion of the carrier material is bent and formed by these dies and punches so as to be accommodated in the leg portion. Manufacturing method Law.