JP4449722B2 - Carrier molding apparatus and manufacturing method - Google Patents

Description

  The present invention relates to a carrier manufacturing apparatus and manufacturing method for a planetary gear mechanism used in an automatic transmission or the like, and more particularly to a technique for forming a plurality of tongue-shaped leg portions provided on the outer peripheral portion of a carrier body. .

A planetary gear mechanism used for an automatic transmission or the like includes a ring gear, a sun gear, a pinion gear that meshes with the ring gear and the sun gear, and a carrier that supports the pinion gear.
The carrier includes a hollow disk-shaped carrier body that supports the support shaft of the pinion gear, and a plurality of tongue-like leg portions that extend from the outer periphery of the carrier body in the rotation axis direction. Yes.

7 and 8, the carrier 50 includes a carrier material 50a in which a plurality of tongue-like leg portions 52, 52, 52 are radially provided on the outer periphery of a hollow disc-shaped carrier body 51. The portion of the carrier body 51 is press-fitted into the body insertion hole 54 of the die 53 with a punch 55, and the legs 52, 52, 52 are bent by approximately 90 degrees at the time of this press-fitting. There is also a document that discloses a molding method (for example, see Patent Document 1).
In this molding method, the punch 55 is provided with leg receiving portions 55 a, 55 a, 55 a, and the standing wall surfaces of the leg receiving portions 55 a, 55 a, 55 a and the inside of the body insertion hole 54 of the die 53. Leg storage spaces 53a, 53a, 53a are formed between the peripheral surface 54a and the legs 52, 52, 52 to be bent are accommodated in the leg storage spaces 53a, 53a, 53a.
Further, the outer peripheral radius Ra of the carrier main body 51, the outer peripheral radius Rb of the punch 55 (the radius of the portion other than the leg receiving portion 55a), and the inner peripheral radius Rc of the main body insertion hole 54 of the die 53 are set to substantially the same value. To be.
Japanese Patent No. 3385513 Japanese Utility Model Publication No. 61-19225

However, in the above prior art, as shown in FIG. 9A, there is a problem that the flash 52a protruding from the outer peripheral surface in the circumferential direction is generated in the leg portion 52.
As shown in FIG. 9B (enlarged view of the portion 59 in FIG. 8), the punches 55 can be inserted into the body insertion holes 54 of the die 53 so as to be inserted into the inner peripheral surface 54a of the body insertion holes 54 and the punches. Between the outer peripheral surfaces 55b of 55, a slight gap is formed in the circumferential direction. For this reason, the surplus of the leg portion 52 enters the gap, and the flash 52a is generated.
The flash 52a generated in this manner causes variations in the shape of the leg portions 52, 52, and 52, and hinders improvement in product quality. Further, a process for removing the flash 52a from the product is required.
Further, when the flash 52a is detached, there are problems that the flash 52a is driven into the carrier 50 to be molded next, and that the die 53 and the punch 55 are damaged and the mold life is shortened.

Therefore, in order to prevent the occurrence of the flash 52a, it is also considered to form a notch at the connecting portion between the leg 52 and the carrier body 51 (see, for example, Patent Document 2), but stress is applied to the notch. This is not suitable because concentration occurs and there is concern about the occurrence of cracks.
In addition, it is considered to reduce the thickness of the connecting portion to prevent the entry of extra space, but the connecting portion is sufficiently mechanical to prevent the leg 52 from being broken or cracked. This measure is also not suitable because strength is required.

  The present invention has been made in view of the above points, and proposes a carrier manufacturing apparatus and a manufacturing method that prevent the occurrence of flash while sufficiently securing the mechanical strength of the connecting portion between the leg and the carrier body. To do.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, as described in claim 1, the leg portion of the carrier material in which a plurality of tongue-like leg portions are radially formed on the outer periphery of the hollow disc-shaped carrier body is arranged in a radial direction from the connection portion with the carrier body. A carrier molding apparatus for molding a carrier having a shape in which legs are extended in the direction of the rotation axis from a carrier body by bending inward, and a body insertion hole into which a portion of the carrier body is inserted A die having a plurality of recesses formed radially outward from the inner peripheral surface of the main body insertion hole, a carrier main body holding portion for holding a portion of the carrier main body, and a carrier main body holding portion from the die A leg receiving portion that protrudes radially outward and is inserted into each concave portion of the die and is formed in a range between the convex portions in the circumferential direction and accommodates the bent leg portion. And have That includes punch and, to an outer peripheral surface of the convex portion in the punch, the radial distance between the wall surface of the leg receiving portion is larger than the thickness of the leg portion of the carrier, molding apparatus carrier It is what.
According to a second aspect of the present invention, a positioning portion corresponding to a groove portion formed from the carrier main body to the end of the leg portion of the carrier material protrudes from the lower surface of the carrier main body holding portion, The material is designed to be positioned with respect to the punch.

According to a third aspect of the present invention , the carrier body portion of the carrier material in which a plurality of tongue-shaped leg portions are radially formed on the outer periphery of the hollow disk-shaped carrier body is punched into the die body insertion hole. The carrier is manufactured by press-fitting in such a manner that the legs are bent radially inward from the connection with the carrier body, and the legs are extended from the carrier body in the direction of the rotation axis. The inner peripheral surface of the main body insertion hole has a circular shape that matches the outer peripheral shape of the carrier main body, and the inner peripheral surface is radially outward in a range between the leg portions in the circumferential direction. A plurality of recesses are formed in the punch, and a plurality of protrusions engaged with the recesses are formed outward in the radial direction on the punch, and between the protrusions in the circumferential direction. The leg receiving part has a radius within the range Is Katachi設toward direction inwardly, the radial distance between the outer peripheral surface and the leg receiving portion of the wall surface of the convex portion is larger than the thickness of the leg portion of the carrier, the said respective convex portions each While the carrier body is inserted into the recess, the carrier body is press-fitted into the body insertion hole, and the carrier is manufactured by bending the legs so as to be accommodated in the leg receiving parts.
According to a fourth aspect of the present invention, the punch includes a carrier main body holding portion that holds a portion of the carrier main body in the carrier material, and a lower surface of the carrier main body holding portion is provided with a leg from the carrier main body in the carrier material. A positioning portion corresponding to the groove portion formed toward the end of the portion is provided so as to be positioned with respect to the punch.

In the inventions according to claims 1 to 4, when the convex portion is inserted into the concave portion, the side surface of the leg portion is pressed by the standing side surface of the convex portion, and the leg portion and the connecting portion of the leg portion The spread of excess meat can be prevented and the occurrence of flash can be suppressed.
And thereby, variation in the shape of the leg can be prevented, and the product quality can be improved. Further, a process for removing the flash from the product is not necessary.
Further, there is no problem such as deterioration of product quality due to detachment of the flash and shortening of the life of the die or punch, and the life of the apparatus can be extended.
In addition, it is possible to prevent the occurrence of flash without reducing the thickness of the connecting part of the leg part with the carrier body or forming a notch in the connecting part, so that sufficient mechanical strength of the connecting part is ensured. can do.

Embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the carrier molding apparatus according to the present invention includes a die 10 and a punch 20, and a plurality of tongue-shaped leg portions 3, 3 on the outer periphery of a hollow disc-shaped carrier body 2. The carrier material 1a formed with 3 is press-fitted into the main body insertion hole 11 of the die 10 with a punch 20, and the legs 3, 3 and 3 are bent approximately 90 degrees during this press-fitting.

As shown in FIG. 2, the carrier material 1 a is configured by disposing tongue-shaped leg portions 3, 3, 3 radially on a hollow disc-shaped carrier body 2.
As shown in FIG. 1, the carrier material 1 a configured in this way is set in a carrier body holding portion of a punch 20 installed in a press apparatus such as a hydraulic press. Positioning portions corresponding to the grooves 3a, 3a, 3a formed from the carrier body 2 to the ends of the legs 3, 3, 3 project from the lower surface of the carrier body holding portion, and the carrier material 1a is punched. 20 to be positioned.

Further, as shown in FIG. 1, the punch 20 is a cylindrical member, and leg receiving portions 20a, 20a, 20a are formed on the outer peripheral surface 20b in the cylindrical axis direction. The leg receiving portions 20a, 20a, 20a are formed at locations corresponding to the legs 3, 3, 3 of the carrier material 1a.
Further, as shown in FIG. 3, the leg receiving portions 20 a, 20 a, and 20 a are leg portions between the inner peripheral surface 11 a of the body insertion hole 11 of the die 10 when the punch 20 is inserted into the die 10. The housing spaces 10a, 10a, 10a are formed, and the leg portions 3, 3, 3 bent to the leg housing spaces 10a, 10a, 10a are accommodated.

  Further, as shown in FIG. 4, in the punch 20, a portion other than the leg receiving portion 20 a and a portion that is not inserted into the concave portions 11 c, 11 c, and 11 c among the convex portions 20 c, 20 c, and 20 c described later The carrier main body holding portion 20h is configured to face one side surface of the carrier main body 2 and hold a portion of the carrier main body 2.

As shown in FIG. 1, when the carrier material 1a is set on the punch 20, the punch 20 is moved to the die 10 installed in the press apparatus (or the die 10 is moved to the punch 20). The carrier body 2 is inserted into the body insertion hole 11.
On the other hand, the leg portions 3, 3, 3 are in contact with the inner peripheral surface 11 a of the main body insertion hole 11, and are rooted toward the leg receiving portions 20 a, 20 a, 20 a of the punch 20 (connection portions with the carrier main body 2). ) Is bent.
In this case, the lower surface of the carrier body 2 is in contact with and held by the upper surface of a columnar knockout plate 7 (see FIG. 4) provided in the body insertion hole 11.
As described above, as shown in FIG. 2, the carrier 1 is formed by extending the legs 3, 3, 3 from the carrier body 2 in the direction of the rotation axis.

Further, as shown in FIGS. 1 and 3, in the punch 20, the portions where the leg receiving portions 20a, 20a and 20a are not formed protrude outward in the radial direction from the leg receiving portions 20a, 20a and 20a. Convex portions 20c, 20c, and 20c having a substantially fan shape in a plan view shown in FIG. The convex portions 20c, 20c, and 20c are formed at three locations between the leg receiving portions 20a, 20a, and 20a.
The body insertion hole 11 of the die 10 is formed in a circular shape that matches the outer peripheral shape of the carrier body 2 to be inserted. That is, a slight gap is formed between the inner peripheral surface 11 a of the main body insertion hole 11 and the outer peripheral surface of the carrier main body 2. The slight gap refers to a gap that allows the carrier body 2 (carrier material 1a) to move in the axial direction within the body insertion hole 11.
The main body insertion hole 11 is formed with a plurality of concave portions 11c, 11c, and 11c into which the convex portions 20c, 20c, and 20c of the punch 20 are inserted. As shown in FIG. 3, the recesses 11 c, 11 c, and 11 c have a shape that enters from the inner peripheral surface 11 a of the main body insertion hole 11 toward the outer side in the radial direction. In addition, the inner peripheral surfaces 11d, 11d, and 11d of the concave portions 11c, 11c, and 11c are configured in a fan shape corresponding to the fan-shaped outlines of the peripheral surfaces of the convex portions 20c, 20c, and 20c in plan view. .
With the above configuration, as shown in FIGS. 3 and 4, when the carrier material 1 a is pressed, the convex portions 20 c, 20 c, and 20 c of the punch 20 are inserted into the concave portions 11 c, 11 c, and 11 c of the die 10. ing.

In the above configuration, as shown in FIGS. 1 and 3, when the center of the cylindrical axis of the punch 20 is the center C, the outer peripheral radius R2 of the convex portions 20c, 20c, 20c is the outer periphery of the carrier body 2. The relationship is larger than the radius R1.
Further, the inner peripheral radius R4 of the concave portions 11c, 11c, and 11c is substantially the same as the outer peripheral radius R2 of the convex portions 20c, 20c, and 20c, and the concave portions 11c, 11c, and 11c have the convex portions 20c, 20c, and 11c. 20c can be moved.
In addition, the outer peripheral radius R1 of the carrier main body 2 is substantially the same as the inner peripheral radius R3 of the main body insertion hole 11 of the die 10, and the carrier main body 2 is movable within the die 10.
Further, as shown in FIGS. 4 and 5, the radial distance between the outer peripheral surface 20b of the convex portion 20c and the standing wall surface 20d of the leg receiving portion 20a, that is, the leg receiving portion 20a in plan view. The distance W1 corresponding to the groove depth is larger than the radial distance W2 of the leg housing space 10a. Further, the radial distance W2 of the leg accommodating space 10a is substantially the same as the plate thickness W3 of the leg 3. Thereby, the groove depth (distance W1) of the leg receiving part 20a is deeper than the plate thickness W3 of the leg 3.

The above is the configuration relating to the carrier molding apparatus and the manufacturing method according to the present invention.
That is, as shown in FIGS. 1 to 4, the leg portions 3, 3 of the carrier material 1a in which a plurality of tongue-like leg portions 3, 3, 3 are radially formed on the outer periphery of the hollow disc-shaped carrier body 2. Reference numeral 3 denotes a carrier forming apparatus for bending and forming a carrier having a desired shape.
The molding apparatus is formed with a main body insertion hole 11 into which a portion of the carrier main body 2 is inserted, and an inner circumferential surface 11a of the main body insertion hole 11 radially outward. A die 10 having a plurality of recesses 11c, 11c, 11c formed in a range between the legs 3, 3, 3; a carrier body holding portion 20h for holding one side surface of the carrier body 2; A plurality of protrusions projecting outward in the radial direction from the carrier body holding portion 20h and having the outer peripheral shape substantially the same as the inner peripheral shape of the concave portions 11c, 11c, 11c are engaged with the concave portions 11c, 11c, 11c. 20c, 20c, 20c and the convex portions 20c, 20c, 20c in the circumferential direction, the convex portions 20c, 20c, 20c are formed in a range between the concave portions 11c, 11c, 11c. The leg receiving spaces 10a, 10a, 10a for receiving the bent legs 3, 3, 3 are formed with the inner peripheral surface 11a of the body insertion hole 11 of the die 10 in a state of being engaged with the die 10. The punch 20 having the leg receiving portions 20a, 20a, and 20a and either one or both of the die 10 and the punch 20 are moved, and the carrier material 1a is inserted into the body insertion hole 11 of the die 10 by the punch 20 The molding apparatus is provided with an actuator such as a hydraulic press for press-fitting with a.

  A portion of the carrier body 2 of the carrier material 1a in which a plurality of tongue-like leg portions 3, 3, 3 are radially formed on the outer periphery of the hollow disk-shaped carrier body 2 is placed in the body insertion hole 11 of the die 10. In the method of manufacturing the carrier, the leg portions 3, 3 and 3 are bent into the desired carrier 1 shape by press-fitting into the punch 20, and the inner peripheral surface 11a of the main body insertion hole 11 is The inner peripheral surface 11a has a plurality of recesses 11c and a plurality of recesses 11c that are radially outward in a range between the legs 3, 3, and 3 in the circumferential direction. 11c and 11c are formed, and the punch 20 is formed with a plurality of convex portions 20c, 20c, and 20c that are engaged with the concave portions 11c, 11c, and 11c toward the radially outer side, Each said convex part 2 in the circumferential direction leg receiving portions 20a, 20a, and 20a are formed radially inward in a range between c, 20c, and 20c, and the convex portions 20c, 20c, and 20c are formed in the concave portions 11c, 11c, and 11c, respectively. While the carrier is inserted, the carrier body 2 is press-fitted into the body insertion hole 11, and the carrier is bent and molded so that the legs 3, 3, and 3 are received in the legs receiving portions 20a, 20a, and 20a. It is a method.

Then, according to the molding of the carrier 1 by the molding apparatus and the manufacturing method described above, it is possible to prevent flash from being generated at the leg 3 as shown in FIG.
That is, as shown in FIG. 5, when the convex portion 20c is inserted into the concave portion 11c, the side surface 3b of the leg portion 3 is pressed by the standing side surface 20g of the convex portion 20c, and the leg portion 3 and the leg portion 3 are pressed. It is possible to prevent the surplus of the connecting portion from spreading.
In this way, by suppressing the occurrence of flash, variations in the shapes of the legs 3, 3, and 3 can be prevented, and the product quality can be improved. Further, a process for removing the flash from the product is not necessary.
Further, there is no problem that the product quality is deteriorated due to the detachment of the burr and the life of the die 10 and the punch 20 is shortened.
Further, since the thickness of the connecting portion of the legs 3, 3 and 3 with the carrier body 2 can be reduced and the occurrence of flash can be prevented without forming a notch in the connecting portion. Sufficient strength can be ensured.

The figure shown about the structure of the shaping | molding apparatus of a carrier. The figure shown about a carrier material and the shape of a carrier. The top view which shows the state by which the punch was inserted in the die | dye at the time of shaping | molding. Side surface sectional drawing which shows the state which inserted the recessed part of the die | dye in the convex part of a punch. The figure shown about the state in the bending process of a leg part. The figure shown about the leg part which does not generate | occur | produce a flash. The figure shown about the structure of the shaping | molding apparatus of the conventional carrier. The top view which shows the state by which the punch was inserted in the dice | dies of the conventional structure. (A) is a figure shown about the leg part which flash generate | occur | produced, (b) The figure which shows about the mechanism of generation | occurrence | production of flash.

DESCRIPTION OF SYMBOLS 1 Carrier 2 Carrier main body 3 Leg part 10 Dies 11 Main body insertion hole 11c Concave part 20h Carrier main body holding part 20c Convex part 20 Punch

Claims (4)

The legs of the carrier material, in which a plurality of tongue-shaped legs are radially formed on the outer periphery of the hollow disk-shaped carrier body, are bent radially inward from the connection with the carrier body, and A carrier molding apparatus for molding a carrier having a shape in which legs are extended in the direction of the rotation axis ,
A body insertion hole into which a portion of the carrier body is inserted;
A die having a plurality of recesses formed radially outward from the inner peripheral surface of the body insertion hole;
A carrier body holding part for holding a portion of the carrier body;
A plurality of convex portions protruding radially outward from the carrier body holding portion and inserted into the concave portions of the die;
A punch having a leg receiving part that is formed in a range between the convex parts in the circumferential direction and accommodates the bent leg part ; and
The radial distance between the outer peripheral surface of the convex part in the punch and the wall surface of the leg receiving part is larger than the plate thickness of the leg part of the carrier,
Carrier molding device. On the lower surface of the carrier main body holding portion, a positioning portion corresponding to a groove portion formed from the carrier main body to the end of the leg portion of the carrier material is projected, so that the carrier material is positioned with respect to the punch. Has become,
The carrier molding apparatus according to claim 1, wherein A portion of the carrier body of the carrier material in which a plurality of tongue-shaped leg portions are radially formed on the outer periphery of the hollow disk-shaped carrier body is press-fitted into the body insertion hole of the die by a punch, thereby A method of manufacturing a carrier that is bent inward in the radial direction from a connection portion with a carrier body and has a carrier shape in which legs are extended from the carrier body in the rotation axis direction,
The inner peripheral surface of the main body insertion hole has a circular shape that matches the outer peripheral shape of the carrier main body, and the inner peripheral surface is radially outward in a range between the leg portions in the circumferential direction. A plurality of recesses are formed,
In the punch, a plurality of convex portions engaged with the concave portions are formed outward in the radial direction, and the leg receiving portion has a radius within a range between the convex portions in the circumferential direction. The radial distance between the outer peripheral surface of the convex portion and the wall surface of the leg receiving portion is greater than the plate thickness of the leg portion of the carrier,
A method for manufacturing a carrier, wherein the carrier main body is press-fitted into the main body insertion hole while the convex portions are inserted into the concave portions, and the leg portions are bent so as to be accommodated in the leg receiving portions. The punch includes a carrier body holding portion for holding a portion of the carrier body in the carrier material,
On the lower surface of the carrier main body holding portion, a positioning portion corresponding to a groove portion formed from the carrier main body to the end of the leg portion of the carrier material is projected, so that the carrier material is positioned with respect to the punch. Has become,
The method for producing a carrier according to claim 3.

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