JPH0740107Y2 - Indexing device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an indexing device having a fluid supply / discharge facility.

2. Description of the Related Art Generally, in an indexing device, a hydraulic chuck or the like may be provided on the indexing table in order to lock a work, but such a hydraulic chuck or the like is installed on a rotating indexing table. Therefore, it is necessary to install special fluid supply and discharge equipment for supplying and discharging hydraulic pressure.

Conventionally, as an indexing device having such a fluid supply / discharge facility, for example, an indexing table that rotates by receiving rotation of a motor that is decelerated by a speed reducer, and a stationary casing that rotatably supports the indexing table. , A substantially columnar feed / discharge member that is mounted on the rotary shaft of the indexing table, has an internal feed / discharge passage, and has a lower end portion that penetrates the casing, and is fitted to the lower end of the feed / discharge member that protrudes from the casing. In addition, there is known a joint block which is prevented from rotating by the casing, has one end opened to the side surface, and the other end formed therein with a fluid passage that can communicate with the supply / discharge passage of the supply / discharge member.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in such an indexing device, since a substantially cylindrical feed / discharge member vertically penetrates the center of the indexing device,
The entire structure is complicated and large due to restrictions on the location of the motor and reducer, and the connection between the one end opening of the fluid passage of the joint block and the piping is directly under the stationary casing, so maintenance is not required. There is a problem that it becomes troublesome.

It is an object of the present invention to provide an indexing device which has a simple structure and a small size and which can be easily inspected and maintained.

Means for Solving the Problems The object of the present invention is to provide a reduction gear of an indexing device, a shaft fixed to a casing, a ring body fixed to an indexing table and having inner teeth formed on an inner periphery thereof, and a motor. A gear having external teeth that eccentrically rotate in response to rotation and meshes with the internal teeth of the ring body on the outer periphery, and has a supply / discharge passage inside the rotary shaft of the indexing table and the tip of the shaft. Is attached to the casing and the shaft, and one end of the casing and the shaft is opened to the side surface of the casing, and the other end forms a fluid passage that can communicate with the supply / discharge passage of the feeding / discharging member. This can be achieved by forming a rotary joint with the discharge member and the tip of the shaft.

Operation First, in the present invention, a fluid passage is formed in the casing and the shaft of the speed reducer, and the tip end portion of the shaft is fitted to the supply / discharge member attached to the indexing table to supply and discharge the fluid passage. The passage can be communicated with each other, and the rotary joint is constituted by the supply / discharge member and the tip of the shaft. As a result, the rotary joint will be placed near the indexing table in the indexing device.
It is no longer necessary to vertically penetrate the feeding / discharging member in the central portion of the indexing device as in the prior art. Moreover, the fluid supply / discharge to / from the rotary joint at this time is performed through the fluid passages formed in the casing and the shaft, which are required in the structure of the indexing device, and it is not necessary to provide a special fluid supply / discharge member. As a result, the degree of freedom in arranging the motor and the speed reducer is increased, and the entire structure is simplified and the size can be reduced. Further, in this invention, one end of the fluid passage is opened to the side surface of the casing, and the one end opening is made a connection point with the external pipe, so that inspection and maintenance are easy.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 is a base of the indexing device 2, on which a casing 4 having a storage chamber 3 formed therein is fixed. The casing 4
An eccentric oscillating planetary gear reducer 8 is housed in the storage chamber 3 of the motor, and a motor 9 which is fixed to the casing 4 immediately below the speed reducer 8 and imparts a rotational force to the speed reducer 8.
Are arranged. The speed reducer 8 has a shaft 12 fixed to the casing 4, and the shaft 12 has a flange portion.
A body 15 composed of 13 and three connecting shafts 14, a disc body 16 attached to the upper ends of the connecting shafts 14, and a joint body 17 fixed to the upper surface of the central portion of the disc body 16. Has been done. Two gears 19 each having a hole 18 into which a connecting shaft 14 is loosely fitted are disposed between the flan portion 13 and the disc body 16, and external teeth 20 are formed on the outer circumference of these gears 19. Has been done. Reference numeral 22 denotes a cam shaft having two eccentric cams 23 in the central portion and arranged alternately with the connecting shaft 14 in the circumferential direction, and both end portions of these cam shafts 22 are flange portions of the shaft 12, respectively.
It is rotatably supported by bearings 24 and 25 on the disk 13 and the disk 16. The eccentric cams 23 of the cam shafts 22 are inserted into the gear 19 with the needle bearings 26 interposed therebetween. Reference numeral 27 denotes an external gear fixed to each cam shaft 22, and these external gears 27 mesh with an external gear 29 formed at the tip of an output shaft 28 of the motor 9. Reference numeral 31 denotes a ring body surrounding the shaft 12 and the gear 19, and the ring body 31 is rotatably supported by the shaft 12 via a pair of bearings 32. This ring body
Inner teeth 33 that mesh with all the outer teeth 20 are formed by a large number of pins on the inner periphery of 31. The number of inner teeth 33 is slightly larger than the number of outer teeth 20. As a result, when the cam shaft 22 rotates, the gear 19 eccentrically swings while meshing with the inner teeth 33. 36
Is a substantially disk-shaped indexing table, and this indexing table 36 is provided with the casing 4 so as to close the upper end opening of the storage chamber 3.
And is fixed to the ring body 31. As a result, the indexing table 36 is attached to the shaft 12 of the speed reducer 8.
It is rotatably supported by the ring body 31 and receives a rotation from the speed reducer 8 to rotate by a predetermined amount.
A substantially column-shaped supply / discharge member 41 is mounted on the rotary shaft of the indexing table 36, and the lower end of the supply / discharge member 41 is fitted with a joint body 17 positioned at the tip (upper end) of the shaft 12. Dowel 40
Is fitted to. Further, inside the supply / discharge member 41,
At least a pair of supply / discharge passages 42, 43 for supplying / discharging fluid to / from a fluid chuck or the like (not shown) used when locking the work on the indexing table 36 are formed.
One end of each of 2, 43 is open to the outer peripheral surface of the feeding / discharging member 41 facing the fitting hole 40, and the other end is open to the upper end surface.
The other end openings of the supply / discharge passages 42 and 43 are connected to the fluid chuck and the like by piping. Further, at least a pair of fluid passages 45 and 46 are formed in the casing 4 and the shaft 12, one end of each of the fluid passages 45 and 46 is opened to a side surface of the casing 4, and these one end openings are not shown. The piping leading to the fluid source is connected. Further, the other ends of the fluid passages 45 and 46 are provided with fitting holes for the joint body 17.
In addition to opening in 40, the other end opening is always provided in the supply / discharge passage regardless of relative rotation between the indexing table 36 and the shaft 12.
One end of 42, 43 communicates with the opening. Thus, the supply / discharge member 41 and the joint body 17 provided at the tip of the shaft 12 form a rotary joint 47.

Next, the operation of the embodiment of the present invention will be described.

Now, assume that the motor 9 is operating and the output shaft 28 thereof is rotating. The rotation of the output shaft 28 is transmitted to the cam shafts 22 to rotate the cam shafts 22, but since the eccentric cams 23 of the cam shafts 22 are fitted to the gear 19,
The gear 19 does not rotate by the rotation of the camshaft 22, but only performs eccentric revolution. Here, since the number of teeth of the inner teeth 33 of the ring body 31 is slightly larger than the number of teeth of the outer teeth 20 of the gear 19, the rotation of the output shaft 28 of the motor 9 is decelerated and output to the gear 19 at a high ratio. .
Then, the indexing table 36 receives the rotation of the gear 19, that is, the rotation from the speed reducer 8, and rotates by a predetermined amount to perform the indexing. It is necessary to supply / discharge the fluid to / from the fluid chuck or the like even while the indexing table 36 is rotating, but since the rotary joint 47 is provided in the middle of the fluid passages 45, 46 and the supply / discharge passages 42, 43 as described above. The fluid is constantly supplied to and discharged from the fluid chuck or the like regardless of the rotation of the indexing table 36. Here, in this embodiment, the rotary joint 47 is installed in the vicinity of the indexing table 36 in the indexing device 2 because the rotary joint 47 is configured as described above. It is no longer necessary to penetrate vertically in the central part of the device 2. Moreover, since the fluid is supplied to and discharged from the rotary joint 47 through the fluid passages 45 and 46 formed in the casing 4 and the shaft 12, which are required in the structure of the indexing device 2, the fluid is supplied and discharged. There is no need to provide a special member. As a result, the degree of freedom in arranging the motor 9 and the speed reducer 8 is increased, and the entire structure can be simplified and downsized. Moreover, in this embodiment, the fluid passage having the connection point with the external pipe opened on the side surface of the casing 4 is used.
Since it is one end of 45 and 46, inspection and maintenance is easy.

In the above-described embodiment, the fluid passages 45, 46 and the supply / discharge passages 42, 43 are always communicated with each other. However, in this invention, the fluid passages 45, 46 and the supply passages 42, 43 are connected to each other depending on the rotation position of the indexing table 36. The rotary passages 47 and 43 may be connected or disconnected to allow the rotary joint 47 to perform a valve action.
Further, in the above-described embodiment, the indexing table 36 is rotatably supported by the speed reducer 8. However, in the present invention, it may be rotatably supported by the casing 4.

Effects of the Invention As described above, according to the present invention, the entire structure can be simplified and downsized, and the inspection and maintenance can be facilitated.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line II of FIG. 2 ... Indexing device, 4 ... Casing 8 ... Reducer, 9 ... Motor 12 ... Shaft, 19 ... Gear 20 ... Outer teeth, 31 ... Ring body 33 ... Inner teeth, 36 ... Indexing table 41 …… Supply / discharge member, 42,43 …… Supply / discharge passage 45,46 …… Fluid passage, 47 …… Rotary joint

Claims (1)

[Scope of utility model registration request] 1. A stationary casing, a speed reducer housed in the casing, a motor attached to the casing for applying a rotational force to the speed reducer, and a casing or a speed reducer rotatably supported by the speed reducer. In an indexing device including an indexing table that rotates and rotates by a predetermined amount, the speed reducer has a shaft fixed to a casing and internal teeth formed on an inner periphery fixed to the indexing table. A ring body and a gear having eccentric rotation in response to the rotation of the motor and having outer teeth on the outer periphery that mesh with the inner teeth of the ring body, and a supply / discharge passage is internally provided on the rotating shaft of the indexing table. And a feed / discharge member fitted with the tip of the shaft is attached, and further, one end is opened to the side surface of the casing in the casing and the shaft, and the other end communicates with the supply / discharge passage of the feed / discharge member. Forming a potential fluid path, indexing device being characterized in that so as to constitute a rotary joint by the leading end portion of the supply-discharge member and the shaft.