JP2516740Y2 - High / low speed switching drive device with hollow motor - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a high / low speed switching drive device used as a fast-forward / slow-feed device of a work table of a machine tool, and more specifically, using a hollow motor as a drive source. The present invention relates to a high / low speed switching drive device.

[Conventional technology]

As a fast-forward / slow-feed device for a machine tool, a device using a gear type harmonic reducer is known. A typical device of this type incorporates two motors,
Fast-forwarding is realized by directly taking out the output of one motor, and slow-forwarding is realized by decelerating and taking out the output of the other motor through harmonic deceleration.

FIG. 3 shows the configuration of this type of device. As shown in the figure, the device 1 has a fast-forwarding motor 2 and a slow-forwarding motor 3 arranged side by side, and an output shaft 3a of this slow-forwarding motor 3 is a wave generator 4a of a gear type harmonic reducer 4. Are linked to. The elastic external gear 4b on the output side of the harmonic reduction gear 4 is connected to the driven shaft 5. On the other hand, a gear 6 is fixed to the output shaft 2a of the fast-forwarding motor 2, and this gear 6 is connected via an idle gear 7 to a gear 4d formed on the outer peripheral surface of the rigid internal gear 4c of the harmonic reducer 4. It is connected. Further, a brake mechanism 8 for fixing the rotation of the output shaft 2a of the fast-forwarding motor is attached to the output shaft 2a. In the apparatus 1 having this configuration, the brake mechanism 8 is opened at the time of fast-forwarding, and the fast-forwarding motor 2 is opened.
Only drive. As a result, the output rotation of the motor is transmitted to the driven shaft 5 side without being decelerated through the gears 6, 7, 4d and the elastic external gear 4b, so that fast-forwarding is performed. On the other hand, at the time of slow feed, by fastening the brake mechanism 8 and fixing the output shaft 2a on the side of the fast-forward motor, the rigid internal gear 4c of the harmonic reducer is fixed, and this harmonic reducer is After setting to the operable state, only the slow feed motor 3 is driven thereafter. As a result, the output rotation of the motor 3 is decelerated via the harmonic reduction gear 4 and the driven shaft 5
It is transmitted to the side of, and slow-forwarding is performed.

[Problems to be solved by the device]

However, in the conventional fast-forward / slow-feed device using the harmonic reducer, the fast-forward and slow-forward motors are required, which increases the product price and the overall size of the device. There is a problem. Further, since the single driven shaft is rotated by the motors arranged side by side, the transmission path of the rotational force from these motors to the driven shaft is also relatively complicated, which makes the rotational force transmission mechanism relatively complex. There is a problem that

An object of the present invention is to realize a high / low speed switching drive device capable of solving such a conventional problem.

[Means for solving the problem]

In order to solve the above problems, the present invention focuses on a hollow motor, and combines the hollow motor and a gear-type harmonic reducer to realize a compact and high-speed switching drive device with a simple structure. I have to. That is, the device of the present invention comprises a hollow motor, a driven shaft extending rotatably through the hollow portion of the hollow motor, and a coaxial arrangement on the outer periphery of the driven shaft. Of the high speed side hollow rotary shaft directly connected to the driven shaft, a gear type harmonic reducer arranged coaxially on the outer periphery of the driven shaft to reduce the speed of rotation input from the hollow motor and output the same, A low speed side hollow rotating shaft coaxially arranged on the outer periphery and connected to the output side of the harmonic reduction gear, and a high speed side clutch means for connecting and disconnecting the driven shaft and the high speed side hollow rotating shaft. , And a low speed side clutch means for connecting and disconnecting the driven shaft and the low speed side hollow rotary shaft.

[Operation] In the device having this structure, the output side of the hollow motor is directly connected to the driven shaft through the high speed side clutch means by engaging the high speed side clutch means and disengaging the low speed side clutch means. Therefore, when the hollow motor is driven in this state, the motor rotation output is directly transmitted to the driven shaft without being decelerated, and the driven shaft rotates at high speed. On the other hand, when the high speed side clutch means is disengaged and the low speed side clutch means is engaged, the output side of the hollow motor is connected to the driven shaft via the harmonic reduction gear. When the hollow motor is driven in this state, the motor rotation output is decelerated and transmitted to the driven shaft, and the driven shaft rotates at a low speed. In this way, by controlling the high speed side clutch means and the low speed side clutch means, the driven shaft can be rotationally driven at high speed or low speed.

〔Example〕

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

FIG. 1 shows a first embodiment of the present invention. As shown in the figure, the device 10 of the present example has a hollow motor 11 and a ball screw 12 as a driven shaft rotatably passing through a hollow portion penetrating the center of the hollow motor. The respective parts of the device are coaxially arranged along the outer circumference of the ball screw 12.

That is, on the outer periphery of the ball screw 12, a cylindrical high-speed rotating shaft 13 is rotatably arranged coaxially with the ball screw 12, and one end 13a side of the high-speed rotating shaft 13 has a hollow motor 1
It is connected to the first roller 11a. A large-diameter flange 13b is formed at the other end of the high-speed rotation shaft 13. A high speed side ball nut 14 meshing with the ball screw 12 is arranged at a position facing the flange, and a hydraulic high speed side clutch for connecting and disconnecting the flange and the nut is arranged between the flange and the nut. Mechanism 15 is arranged.

On the other hand, the hollow motor 11 is sandwiched between the above high speed side clutch mechanism.
A gear type harmonic reducer 16 is coaxially arranged adjacent to the hollow motor 11 at a position opposite to the side where the 15 is arranged. The harmonic speed reducer 16 is a so-called cup type speed reducer, and the end of the wave generator 16a is connected to the end 13a of the high-speed rotating shaft. On the closed end face side of the cup-shaped elastic external gear 16b arranged on the outer periphery of the wave generator 16a, a cylindrical low-speed rotating shaft 17 is integrally formed, and the end of the low-speed rotating shaft 17 has a large diameter. A flange 17a is formed. On the other hand, the rigid internal gear 16c of the harmonic reducer is connected to a housing 18 that integrally surrounds the hollow motor 11 and the harmonic reducer 16, and this housing 18 is a base 19
Is connected to the side of.

Next, at the position facing the flange 17a of the low speed rotation shaft, the low speed side ball nut meshed with the ball screw 12 is provided.
20 is arranged, and between the flange 17a and the nut 20, a hydraulic low speed side clutch mechanism 21 for connecting and disconnecting these is arranged.

The operation of the device 10 having this configuration will be described. First, by a hydraulic control mechanism (not shown), the high speed side clutch mechanism 15 is engaged,
When the low speed side clutch mechanism 21 is opened, the flange 13a of the high speed rotation shaft 13 is connected to the high speed side nut 14 via the high speed side clutch mechanism 15. When the hollow motor 11 is driven in this state, the output rotation of the hollow motor 11 is transmitted from the high speed rotation shaft 13 to the high speed side nut 14 via the high speed side clutch mechanism 15, and the nut 14 rotates at high speed. As a result, the ball screw 12 moves at high speed in the axial direction. On the other hand, when the high speed side clutch mechanism 15 is disengaged and the low speed side clutch mechanism 21 is fastened, the flange 17a of the low speed rotation shaft 17 is connected to the low speed side nut 20 via the low speed side clutch mechanism 21. In this case, the output rotation of the hollow motor 11 is input to the wave generator 16a of the harmonic speed reducer 16, decelerated by the speed reducer, and taken out via the elastic external gear 16b. The output rotation reduced in this way is transmitted to the low speed side nut 20 via the low speed rotation shaft 17 and the clutch mechanism 21, and the nut 20 rotates at a low speed. As a result, the ball screw 12 moves at a low speed in the axial direction.

As described above, in the device of this example, the ball screw 12, which is the driven shaft, can be moved at high speed and low speed in the axial direction by controlling the clutch mechanism on the high speed side and the low speed side. Therefore, if the moving table of the machine tool is supported by the ball screw 12, fast-moving and slow-moving of the moving table can be realized.

Next, FIG. 2 shows an apparatus according to another embodiment of the present invention. The configuration of the device of this example is basically the same as the configuration of the device shown in FIG. However, in this example, a rotating shaft 31 that rotates integrally with the high-speed side and low-speed side ball nuts 14 and 20 is used as the driven shaft instead of the ball screw. Further, these high speed side and low speed side nuts 14 and 20 are rotatably supported on the base 19 side via ball bearings 32 and 33, respectively.

In the device of this example having this configuration, the high speed side and the low speed side clutch mechanisms 15 and 21 are controlled in the same manner as in the case of the device of FIG. And can be rotated at low speed.

[Effect of device]

As described above, in the present invention, the hollow motor is mounted coaxially with the harmonic reducer, the driven shaft is arranged so as to penetrate through the centers thereof, and the high speed side clutch mechanism and the low speed side clutch mechanism are arranged. Then, the driven shaft is driven at high speed and low speed by controlling these clutch mechanisms. Therefore, according to the present invention, unlike the conventional case, the driven shaft can be driven at high speed and low speed by a single motor, so that compared to the case of requiring two motors as in the conventional case. The advantages are that the structure is simple, the entire device can be made compact, and the manufacturing cost is low.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing an apparatus of one embodiment of the present invention, FIG. 2 is a partial sectional view showing an apparatus of another embodiment of the present invention, and FIG. 3 is a partial sectional view showing a conventional apparatus. is there. Explanation of code 10… Device 11… Hollow motor 12… Ball screw (driven shaft) 13… High-speed rotating shaft 14… High-speed side ball nut 15… High-speed side clutch mechanism 16… Gear type harmonic reducer 17… Low-speed rotating shaft 20 ... Low speed side ball nut 21 ... Low speed side clutch mechanism 31 ... Rotary shaft (driven shaft) 32, 33 ... Ball bearing

Claims (1)

(57) [Scope of utility model registration request] 1. A hollow motor, a driven shaft extending rotatably through a hollow portion of the hollow motor, and a coaxially arranged outer periphery of the driven shaft, which is directly connected to an output side of the hollow motor. A high speed side hollow rotating shaft, and a harmonic reducer coaxially arranged on the outer periphery of the driven shaft, for reducing the rotation input from the hollow motor and outputting the same, and coaxially on the outer periphery of the driven shaft. A low speed side hollow rotary shaft connected to the output side of the harmonic reducer, a high speed side clutch means for connecting and disconnecting the driven shaft and the high speed side hollow rotary shaft, and the driven shaft. And a low speed side clutch means for connecting and disconnecting between the low speed side hollow rotary shaft and the low speed side hollow rotary shaft.