JPH0536605Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a chuck device for chucking a bevel gear in which the front and rear portions of meshing teeth are formed into conical surfaces.

[Conventional technology]

A bevel gear 1 used as a differential gear of an automobile differential device, for example, has meshing teeth 2 as shown in FIG.
It has a structure in which the front and rear portions are formed into conical surfaces 3 and 4. Such a bevel gear 1 is formed by highly precisely processing meshing teeth 2 on the bevel gear 1 formed into a predetermined external shape using a dedicated gear cutting machine.

When cutting the gears of the bevel gear 1, a loader device is used to attach or remove the bevel gear 1 from a gear cutting machine.

The loader device includes a pair of loader arms, and chuck claws 6 and 7 as shown in FIG. 7 are attached to the loader arms. The chuck pawls 6 and 7 have an outer diameter surface 5 of the bevel gear 1, a front conical surface (hereinafter simply referred to as a conical surface) 3, and a rear conical surface (hereinafter simply referred to as a back conical surface) 4 on opposing tip sides, respectively. Recesses 8 and 9 for holding are formed.

During machining, move the loader arm toward the center (approach)
After gripping and centering the bevel gear 1 with the recesses 8 and 9 of the pair of chuck claws 6 and 7, the loader arm is moved backward and the back surface 1a of the bevel gear 1 is aligned with the reference surface of a gear cutting machine (not shown). After fixing, the chuck claws 6 and 7 are separated to release the bevel gear 1 and escape. After processing is completed, the chuck claws 6 and 7 grip the bevel gear 1 again, and the loader arm is moved forward.
The bevel gear 1 is removed from the gear cutting machine and transported to the next process.

[The problem that the idea attempts to solve]

Recesses 8 in the chuck claws 6 and 7 of the loader device,
Reference numeral 9 has a shape that matches the external shape of the bevel gear 1 in order to center the bevel gear 1 and to attach and remove it from the gear cutting machine. Therefore, chuck pawls 6 and 7 are specially designed to match the bevel gear 1. On the other hand, the bevel gear 1 used in automobile differentials has a standardized shape, there are only a few types, and each gear is manufactured on a dedicated line.

However, in recent years, with the diversification of vehicle models, the types of bevel gears 1 have also been diversified, and the angles of the conical surface 13 and back conical surface 14 have been changed as shown in FIG. 8 with respect to the standardized bevel gear 1. Bevel gears 10 with improved strength by increasing the length of the tooth bottom 11 have also begun to be manufactured. This irregularly shaped bevel gear 10 has an outer diameter surface 12 wider than the standard bevel gear 1, and a conical surface 1.
3 and the width of the back conical surface 14 are also changed.

The irregularly shaped bevel gear 10 is not manufactured on a dedicated line, but is manufactured using a standard bevel gear 1 line. Therefore, the irregularly shaped bevel gear 10 is loaded into and taken out of the processing machine by being checked by a standard loader device. In this case, as shown in FIG. 9, although the standard chuck claws 6 and 7 can sufficiently chuck the irregularly shaped bevel gear 10
The movement stroke of the loader arm is different when checking the irregularly shaped bevel gear 10 and when checking the irregularly shaped bevel gear 10. That is, the stroke when chucking the irregularly shaped bevel gear 10 is shorter than when chucking the standard bevel gear 1. Therefore, when controlling automatically,
Since the chuck completion signal cannot be obtained at a fixed position in the stroke of the loader arm and a complicated detection mechanism is required, conventionally a special chuck that matches the shape of the irregularly shaped bevel gear 10 as shown in Fig. 10 has been used. Nail 1
5, 16, and standard chuck claws 6,
7 and odd-shaped chuck claws 15 and 16 were changed to make the stroke of the loader arm constant. Therefore, chuck claws 6, 7 and 15, 16
It took a long time to replace the machine, and because the machine was replaced frequently, the processing machine stopped for a long time, resulting in poor productivity.

This invention attempts to provide a chuck device that can chuck a standard bevel wheel and a modified bevel gear without replacing the chuck pawl and without changing the stroke of the loader arm.

[Means to solve the problem]

The chuck device in the present invention is a chuck device for chucking a bevel gear in which the front and rear portions of the meshing teeth are formed into conical surfaces, and has a support surface on the tip side that supports the outer diameter surface and the back conical surface of the bevel gear. The formed pair of chuck pawls, a pair of auxiliary pawls that are slidably attached to each chuck pawl along the radial direction and support the front conical surface of the bevel gear on the tip side, and the chuck pawls and the auxiliary pawls. It is equipped with a pair of springs which are compressed and interposed between the springs and which cause the auxiliary pawl to protrude at all times.

[Effect]

In the chuck device having the above structure, when the chuck pawls are brought close to each other to chuck the bevel gear, in the case of a standard bevel gear, the chuck pawl and the auxiliary pawl come into contact with the bevel gear almost simultaneously and chuck the bevel gear. In addition, in the case of irregularly shaped bevel gears, first the chuck pawl hits the back conical surface of the irregularly shaped bevel gear, then the irregularly shaped bevel gear moves in the axial direction, the conical surface hits the auxiliary pawl, and then the auxiliary pawl comes into contact with the spring. When the chuck claw moves a predetermined stroke, the chuck is completed.

In this way, even if the shape of the bevel gear changes due to the auxiliary pawl being inserted into the chuck pawl, the chuck can be reliably chucked without changing the movement stroke of the chuck pawl (loader arm).

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 5.

In FIG. 1, reference numerals 20 and 21 denote a pair of chuck pawls that chuck the bevel gear 1, and a horizontal support surface 22, which supports a part of the outer diameter surface 5 of the bevel gear 1, at the center line side tip surface of each pawl, 23 and tapered support surfaces 24 and 25 that support the back conical surface 4 are formed. The chuck claws 20, 21 are attached to a pair of loader arms (not shown) that move symmetrically in the front-rear direction and the up-down direction. Reference numerals 26 and 27 designate storage boxes attached to the front surfaces of the chuck claws 20 and 21, which are hollow boxes with one side open, and are each attached with the open side facing the center line side. 28 and 29 are the respective storage boxes 26 and 2
A pair of auxiliary pawls are slidably housed in the bevel gear 7, and tapered pressing surfaces 30 and 31 for pressing the conical surface 3 of the bevel gear 1 are formed on the rear end surface. This auxiliary claw 28,2
9 includes a bottom portion 26a of each storage box 26, 27;
Adjustment screws 32, 3 slidably passed through 27a
3 are screwed together, and the heads 32a, 33a of the adjustment screws 32, 33 engage with the storage boxes 26, 27, thereby regulating the protruding positions of the auxiliary claws 28, 29. Incidentally, by changing the screwing amount of the adjustment screws 32 and 33, the amount of protrusion of the auxiliary claws 28 and 29 can be adjusted as desired. 34 and 35 are each adjustment screw 3
The auxiliary claws 28, 29 are always projected by springs wound around the auxiliary claws 2, 33 and compressed between the auxiliary claws 28, 29 and the storage boxes 26, 27.

When chucking the standard bevel gear 1, the chuck device moves the loader arm a predetermined stroke to bring the chuck pawls 20, 21 close to the bevel gear 1, and as shown in FIG.
21 and the auxiliary pawls 28, 29 contact the bevel gear 1 at approximately the same time, and the horizontal support surface 2 of the chuck pawls 20, 21
2, 23 and tapered support surfaces 24, 25 are the bevel gear 1
The tapered pressing surfaces 30 and 31 of the auxiliary pawls 28 and 29 hold the conical surface 3 and chuck the bevel gear 1.

When chucking the irregularly shaped bevel gear 10, the loader arm is moved a predetermined stroke and the chuck pawl 2 is
0 and 21 are brought closer to the irregularly shaped bevel gear 10, as shown in FIGS. 3 and 4, the chuck pawls 20 and 2
The tapered support surfaces 24 and 25 of 1 contact the back conical surface 14 of the irregularly shaped bevel gear 10, and then the irregularly shaped bevel gear 10 moves in the axial direction and the conical surface 13 contacts the tapered pressing surface 30 of the auxiliary pawls 28 and 29. 31, and thereafter the auxiliary claw 2
8 and 29 are relatively retreated, and the storage box 26,
27 and the chuck pawls 20, 21 move to the stroke end, the horizontal support surfaces 22, 23 and the tapered support surfaces 24, 25 of the chuck pawls 20, 21
holds a part of the outer diameter surface 12 and the back conical surface 14 of the irregularly shaped bevel gear 10, and the tapered pressing surfaces 30, 31 of the auxiliary pawls 28, 29 hold the conical surface 13 and chuck the irregularly shaped bevel gear 10.

When the irregular bevel gear 10 is opened, the chuck pawls 20, 2
1 separates from the irregular bevel gear 10, the auxiliary pawl 28,
29 is the storage box 2 with springs 34 and 35.
6, 27 and returns to its original state.

In addition, when the irregular bevel gear 10 is chucked, the auxiliary pawl 2
8, 29 and the deformed bevel gear 10 is small and the auxiliary pawls 28, 29 are required to have high rigidity, as shown in FIG.
A large number of steel balls 36 are accommodated in the auxiliary claw 27.
When the steel balls 8, 29 enter the storage boxes 26, 27 by a predetermined amount, the steel balls 36, 36, . In this case, the auxiliary claws 28, 29
The number of steel balls 36 accommodated is increased or decreased depending on the amount of retraction.
Also, if the steel ball 36 is used, the auxiliary claws 28, 29
can swing slightly, so even if there is an error in the shape of the irregularly shaped bevel gear 10, this can be absorbed.

Further, in the above embodiment, the auxiliary claws 28, 29 are provided outside the chuck claws 20, 21, but grooves may be formed in the chuck claws 20, 21, and the auxiliary claws may be provided within these grooves.

[Effect of idea]

According to this invention, it is possible to reliably chuck a standard bevel gear and a modified bevel gear without changing the stroke of the chuck pawl (loader arm). Therefore, the chuck completion signal can always be obtained in the same state, facilitating automatic control.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the chuck device according to the present invention, Fig. 2 is a cross-sectional view of a standard bevel gear when chucked, Figs. 3 and 4 are cross-sectional views of irregularly shaped bevel gears when chucked, and Fig. 5. 6 is a schematic diagram showing an example of a standard bevel gear, FIG. 7 is a sectional diagram of a conventional chuck device, FIG. 8 is a schematic diagram showing an irregularly shaped bevel gear, and FIG. FIG. 9 is a sectional view of the irregularly shaped bevel gear when it is chucked, and FIG. 10 is a sectional view of a chuck device exclusively for the irregularly shaped gear. 20, 21...Chuck claw, 22, 23...Horizontal support surface, 24, 25...Taper support surface, 27,
28...Auxiliary claw, 30, 31...Tapered pressing surface,
34, 35...Spring.

Claims (1)

[Scope of utility model registration request] A chuck device for chucking a bevel gear in which the front and rear portions of the meshing teeth are formed into conical surfaces, and includes a pair of chuck pawls having a support surface on the tip side that supports the outer diameter surface and the rear conical surface of the bevel gear. and a pair of auxiliary pawls that are slidably attached to each chuck pawl along the radial direction and support the front conical surface of the bevel gear on the tip side, and a pair of auxiliary pawls that are compressed and interposed between the chuck pawls and the auxiliary pawls. ,
A chuck device for a bevel gear characterized by comprising a pair of springs that cause an auxiliary pawl to protrude at all times.