JP5704966B2 - Equipment for manufacturing pulley shaft with parking gear - Google Patents

Description

  The present invention relates to a technique for manufacturing a pulley shaft with a parking gear.

  A vehicle is equipped with a parking brake, and it is known that a parking gear, which is one of the components of the parking brake, is attached to a pulley shaft of a CVT (continuously variable transmission) (for example, Patent Documents). 1 (FIG. 1).)

Patent document 1 is demonstrated based on the following figure.
FIG. 10 is a diagram for explaining a manufacturing process of a conventional pulley shaft with a parking gear. As shown in FIG. 10A, a cylindrical material 101 is prepared, and as shown in FIG. Then, a hot forged product 105 composed of the pulley portion 103 and the disc portion 104 that is planned to be the parking gear portion is formed.

The hot forged product 105 is moved to a cold forging machine, and the parking gear portion 106 is formed as shown in (c) (first cold forging step).
Next, the parking gear part 106 is cold-finished, so that a chamfer 107 is applied as shown in (d) (second cold forging step). Thus, the pulley shaft 108 with a parking gear is completed.

Moreover, the parking gear part is also finished by machining (see, for example, Patent Document 2 (FIGS. 8 to 10)).
FIG. 11 is a diagram for explaining a manufacturing process of a conventional counter driven with a parking lock, and a hot forging product 111 having a shape as shown in FIG. Next, as shown in (b), the cold forging product 113 is obtained by modeling the counter driven part 112 with a cold forging machine.
And the parking lock part 114 is cut out by machining as shown in (c).

  In the technique of Patent Document 1, since the parking gear portion 106 is formed in the first cold forging process, the second cold forging process is essential for finishing. Therefore, in the technique of Patent Document 1, it is necessary to perform the hot forging process, the first cold forging process, and the second cold forging process in this order.

  In the technique of Patent Document 2, since the parking lock portion 114 is not formed by cold forging, machining is essential for gear cutting. Therefore, the technique of Patent Document 2 needs to perform a hot forging process, a cold forging process, and a machining process in this order.

  In the technique of Patent Document 2, it is necessary to prepare a machine tool for the machining process, and gear cutting with the machine tool cuts teeth one by one, so that the processing time becomes long. In order to maintain productivity, it is necessary to prepare a high-performance machine tool or to prepare a plurality of machine tools, which increases equipment costs.

In that respect, since the technique of Patent Document 1 is all forging, all the teeth can be formed in one shot, which is advantageous in terms of productivity.
However, it is necessary to prepare a mold for the hot forging process, a mold for the first cold forging process, and a mold for the second cold forging process, which increases the mold cost.

  Therefore, there is a need for a manufacturing technique for a pulley shaft with a parking gear that can reduce mold costs while maintaining good productivity.

Japanese Patent No. 2939226 Japanese Patent No. 2555290

  It is an object of the present invention to provide a manufacturing technique of a pulley shaft with a parking gear that can reduce mold costs while maintaining good productivity.

  The present inventors pay attention to the fact that the parking gear portion has been shaped or cut out by cold forging or machining in the past, and if it is shaped by hot forging until the rough (rough) forming of the parking gear portion, It has been found that forging can be dedicated to finishing and the number of cold forging processes can be reduced.

  However, in the conventional technology in which the gear part is formed by cold forging or later, the rotational direction position (orientation) of the hot forged product is not a problem, but the process until the rough (rough) forming of the parking gear part is heated. When forming by cold forging, it becomes a problem to set a hot forged product in a cold forging machine. Therefore, in the present invention, the hot forged product is set in the cold forging machine after being positioned by the rotary positioning mechanism.

The invention according to claim 1 is an apparatus for manufacturing a pulley shaft with a parking gear formed by integrally forming a parking gear on a pulley shaft,
By hot forging a rod-shaped material, a hot forging machine that forms a pulley portion on the shaft portion and a parking gear portion on the pulley portion;
A rotation positioning mechanism for determining a position in a rotation direction with respect to the parking gear portion;
A cold forging machine that finishes the parking gear portion by performing cold forging on the hot forged product in which the position in the rotational direction is determined;
A loader for transporting a hot forged product whose position in the rotational direction is determined from the rotational positioning mechanism to the cold forging machine ,
The rotational positioning mechanism includes a rotating body that supports the hot forged product, and a driving unit that rotates the rotating body around a vertical axis.
The loader has a rail laid parallel to a line passing through the center of the rotary positioning mechanism and the center of the cold forging machine, a slider mounted on the rail, and moves the slider along the rail. It consists of a moving cylinder, an arm mounted on the slider, and a finger that is provided at the tip of the arm and sandwiches the positioned hot forged product, and moves in parallel without rotating the hot forged product. It is characterized by.

The invention according to claim 1 requires a rotational positioning mechanism and a loader. However, the rotational positioning mechanism and the loader are much cheaper than a cold forging machine or a cold forging die. Accordingly, an inexpensive pulley gear manufacturing apparatus with a parking gear is provided.
The loader carefully transports the hot forged product from the rotary positioning mechanism to the cold forging machine without inadvertent rotation.

It is a principle diagram of a continuously variable transmission incorporating a pulley shaft with a parking gear. It is sectional drawing of a pulley shaft with a parking gear. It is a layout of the manufacturing apparatus of the pulley shaft with a parking gear which concerns on this invention. It is a side view of the hot forging product modeled by the method of the present invention. FIG. 5 is a view taken in the direction of arrow 5 in FIG. 4. It is a front view of a rotation positioning mechanism. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 6. It is a figure explaining the conveyance process and cold forging process by a loader. It is a manufacturing flow figure of the pulley shaft with a parking gear concerning the present invention. It is a figure explaining the manufacturing process of the conventional pulley shaft with a parking gear. It is a figure explaining the manufacturing process of the conventional counter driven with a parking lock.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

Embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the continuously variable reduction gear (CVT) 10 includes a driving pulley 11, a driven pulley 12, and a belt 13 wound around these pulleys 11 and 12.

The driving pulley 11 includes a pulley shaft 20 with a parking gear, and a movable pulley 14 fitted to a shaft portion 21 of the pulley shaft 20 with a parking gear so as to be movable in the axial direction.
The driven pulley 12 includes a pulley shaft 15 and a movable pulley 16 fitted to the pulley shaft 15 so as to be movable in the axial direction.

As shown in FIG. 2, the pulley shaft 20 with a parking gear includes a shaft portion 21, a pulley portion 22 that is bulged outward from the shaft portion 21, and a parking lot that is integrally formed with the pulley portion 22. And a gear 23. The parking gear 23 indicates a gear after the parking gear portion is finished in the cold forging process.
A preferred example of a manufacturing apparatus for manufacturing the pulley shaft 20 with a parking gear having such a structure will be described below.

  As shown in FIG. 3, a pulley shaft manufacturing apparatus 30 with a parking gear is a hot forging machine that forms a pulley portion on a shaft portion and forms a parking gear portion on a pulley portion by hot forging a rod-shaped material. 31, a rotation positioning mechanism 40 that determines a position in the rotation direction with respect to the parking gear portion, a transport means 32 that conveys the hot forging product W <b> 1 from the hot forging machine 31 to the rotation positioning mechanism 40, and a position in the rotation direction The cold forging machine 70 finishes the parking gear section by performing cold forging on the hot forging product W2 determined, and the hot forging product W2 rotates carelessly from the rotary positioning mechanism 40 to the cold forging machine 70. And a loader 60 that is carefully transported without causing any damage.

Since the hot forging machine 31 is a well-known apparatus, description of a structure is abbreviate | omitted and the shape of the hot forging goods W1 obtained is demonstrated.
As shown in FIG. 4, the hot forged product W <b> 1 includes a shaft portion 21, a pulley portion 22 formed to bulge outward from the shaft portion 21, and a parking gear portion integrally formed with the pulley portion 22. 25.

As shown in FIG. 5, the parking gear portion 25 includes a wide tooth 26 and a narrow tooth bottom 27 formed between the tooth 26 and the tooth 26.
The parking gear portion 25 having such a shape is also formed by hot forging.

  In FIG. 3, the hot forging product W <b> 1 is picked up from the hot forging machine 31 by the transport means 32 such as a robot, and this hot forging product W <b> 1 is placed on the rotary positioning device 40. At this time, the rotational direction position (azimuth) of the hot forged product W1 does not matter.

  As shown in FIG. 6, the rotary positioning device 40 has a table 41 and a hole 44 that is supported by the table 41 so as to be rotatable about a vertical axis via bearings 42 and 43 and accommodates a hot forged product W <b> 1 at the top. A rotating body 45 provided, driving means 46 such as a motor for rotating the rotating body 45, cylinder means 48 attached to a bracket 47 extending from the table 41, and a rod 50 extending from a piston rod 49 of the cylinder means 48 And an arrow-shaped member 51 that is attached to the rod 50 so as to be movable in the axial direction, and an elastic member 52 that urges the arrow-shaped member 51 toward the parking gear portion 25. The elastic member 52 is preferably a compression coil spring.

  The arrow-shaped member 51 is moved by the cylinder means 48 on a large scale, and moves along the rod 50 on a small scale.

The operation of the rotary positioning device 40 will be described with reference to FIG.
As shown to (a), the hot forging W1 is set to a rotary body (FIG. 6, code | symbol 45), without determining a rotation direction position (azimuth | direction). When the cylinder means (FIG. 6, reference numeral 48) is extended, the tip of the arrow-shaped member 51 hits the tooth 26 with high probability. Next, the hot forged product W1 is slowly rotated.

  Then, as shown to (b), the front-end | tip of the arrow-shaped member 51 approachs the tooth bottom 27, and restrict | limits subsequent rotation. At this time, the driving means (FIG. 6, reference numeral 46) is stopped. As a result, a hot forged product W2 whose position in the rotational direction is determined is obtained.

  In FIG. 3, the hot forged product W <b> 2 whose position in the rotational direction is determined is transported to the cold forging machine 70 by the loader 60. The loader 60 includes, for example, a rail 61 laid on the floor, a slider 62 that moves on the rail 61, a moving cylinder 63 that moves the slider 62, a lifting member 64 that is held up and down by the slider 62, A lifting cylinder 65 that moves the lifting member 64 up and down, an arm 66 that extends horizontally from the lifting member 64, and fingers 67 and 67 provided at the tip of the arm 66.

The subsequent operation will be described with reference to FIG.
As shown in FIG. 8A, the hot forged product W2 is transported without rotating around the vertical axis while the parking gear portion 25 is sandwiched between the fingers 67 and 67.

  The cold forging machine 70 includes a tooth finishing die 71 and a pusher 72 as shown in FIG. The parking gear 25 is accurately set on the tooth finish die 71 by the fingers 67 and 67. By setting it accurately, the phase of the tooth finishing die 71 and the phase of the parking gear portion 25 match.

  As shown in (c), the push forge 72 pushes the hot forged product W <b> 2 strongly toward the tooth finish die 71. The teeth 26 are finished by this cold forging, and the pulley shaft 20 with a parking gear shown in FIG. 2 is obtained.

The manufacturing procedure described above is reproduced based on the flowchart.
As shown in FIG. 9, a rod-shaped material is made by cutting a round bar into an appropriate length (ST01).
This rod-shaped material is put on a hot forging machine to form a pulley shaft including a parking gear (ST02: hot forging process).
The obtained hot forged product is transported to a rotary positioning mechanism by a robot or the like (ST03: transport process).

The hot forging product is changed to a predetermined rotational position (orientation) by the rotational positioning mechanism (ST04: positioning step).
The hot forged product whose position has been determined is carefully transported to the cold forging machine with a loader (ST05: precision transport process).
A parking gear part is finished with a cold forging machine (ST06: cold forging process).

  The forging process only needs a hot forging process and a cold forging process. No machining is necessary. Therefore, the manufacturing method of the pulley shaft with a parking gear which can reduce metal mold | die cost, maintaining productivity favorable is provided.

  In this embodiment, the rotational positioning mechanism employs a method of fitting the arrow-shaped member to the tooth bottom. With this method, the structure is simple. However, the arrow member may be changed to a non-contact type sensor (image sensor or the like).

  The present invention is suitable for a pulley shaft with a parking gear incorporated in a continuously variable transmission.

DESCRIPTION OF SYMBOLS 10 ... Continuously variable transmission, 20 ... Pulley shaft with parking gear, 21 ... Shaft part, 22 ... Pulley part, 23 ... Parking gear, 25 ... Parking gear part, 30 ... Manufacturing apparatus of pulley shaft with parking gear, 31 ... Heat Inter-forging machine, 32 ... conveying means, 40 ... rotating positioning mechanism, 45 ... rotating body, 46 ... driving means, 60 ... loader, 61 ... rail, 62 ... slider, 63 ... moving cylinder, 66 ... arm, 67 ... finger, 70 ... Cold forging machine, W1 ... Hot forging product, W2 ... Hot forging product with a determined position in the rotational direction.

Claims (1)

A pulley shaft manufacturing apparatus with a parking gear formed by integrally forming a parking gear on a pulley shaft,
By hot forging a rod-shaped material, a hot forging machine that forms a pulley portion on the shaft portion and a parking gear portion on the pulley portion;
A rotation positioning mechanism for determining a position in a rotation direction with respect to the parking gear portion;
A cold forging machine that finishes the parking gear portion by performing cold forging on a hot forged product whose position in the rotational direction is determined;
A loader for transporting a hot forged product whose position in the rotational direction is determined from the rotational positioning mechanism to the cold forging machine ,
The rotational positioning mechanism includes a rotating body that supports the hot forged product, and a driving unit that rotates the rotating body around a vertical axis.
The loader has a rail laid parallel to a line passing through the center of the rotary positioning mechanism and the center of the cold forging machine, a slider mounted on the rail, and moves the slider along the rail. It consists of a moving cylinder, an arm mounted on the slider, and a finger that is provided at the tip of the arm and sandwiches the positioned hot forged product, and moves in parallel without rotating the hot forged product. An apparatus for producing a pulley shaft with a parking gear.

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