JP3243765U - Hollow type reduction mechanism - Google Patents

Abstract

The present invention provides a hollow speed reduction mechanism that can achieve high torque, high precision, and high rigidity. A hollow type speed reduction mechanism includes a base, a motor 30, a wave gear device 40, and a transmission mechanism. The base has a first opening. The motor is mounted on the base and has a drive shaft 32. The drive shaft is inserted into the base. The strain wave gearing device is mounted on the base and has a waveform generator 45. The waveform generator is inserted into the base through a first opening in the base and has a first axial hole 48 . The transmission mechanism is disposed in the base and connected to the drive shaft of the motor and the input end 46 of the waveform generator, and receives the driving force of the motor to rotate the waveform generator. [Selection diagram] Figure 3

Description

The present invention relates to a speed reduction mechanism, and more particularly, to a hollow type speed reduction mechanism that can maintain high torque, high precision, and high rigidity.

In the hollow rotary table disclosed in Patent Document 1, the first input shaft rotates and simultaneously drives and rotates the second input shaft via a planetary gear. Subsequently, the second input shaft rotates and at the same time causes the third input shaft to operate in conjunction with the rotation. The third input shaft simultaneously rotates and interlocks the input gear. As the input gear rotates, it simultaneously engages the output gear and rotates the outer ring of the cross roller bearing. However, the problem is that the overall volume is relatively large due to the arrangement of the planetary gears.

In the hollow rotary table reducer disclosed in Patent Document 2, by starting the motor, the main drive shaft interlocks the large chain ring of the reduction transmission mechanism via the main gear, and at the same time connects the small chain ring of the reduction transmission mechanism. The passive gear of the main drive shaft is interlocked via the Subsequently, after the speed is reduced by the reduction transmission mechanism, the workpiece platform connected to the passive shaft rotates. The problem with Patent Document 2 is that the reduction ratio is limited and the overall volume is relatively large.

In the hollow wave gear device disclosed in Patent Document 3, when the hollow motor is started, the hollow shaft rotates the wave generator. At the same time, the difference in the number of teeth between the internal gear and the external gear produces a deceleration effect, causing the external gear to rotate the output shaft. However, in Patent Document 3, since the wiring passes through the hollow shaft, the wiring is likely to be damaged due to thermal energy generated in the rotating motor. In addition, since the hollow motor is directly connected to the wave generator, the sealing structure to prevent lubricating oil from leaking into the motor is relatively complicated, and the cost thereof is high.

CN109268480 publication TWM314810 publication TWI563195 publication

The main purpose of the present invention is to provide a hollow speed reduction mechanism that can realize high torque, high precision, high rigidity, high reduction ratio, and small volume.

A hollow speed reduction mechanism for solving the above-mentioned problems includes a base, a motor, a wave gear device, and a transmission mechanism. The base has a first opening. The motor is attached to the base and has a drive shaft. The drive shaft is inserted into the base. The strain wave gearing device is mounted on the base and has a waveform generator. The drive shafts of the waveform generator and motor are non-coaxial. The waveform generator has an input end, an output end and a first axial hole. The first axial hole passes through the input end and the output end. The input end of the waveform generator is inserted into the base through the first opening in the base. The transmission mechanism is disposed in the base and connected to the drive shaft of the motor and the input end of the waveform generator, and rotates the waveform generator by the driving force of the motor.

In detail, once the motor is started, the transmission mechanism uses the driving force of the motor to rotate the waveform generator, so the principle of strain wave gearing not only maintains high torque, high precision and high rigidity, but also reduces the overall volume. This makes it possible to output high torque without using a high-output motor. In addition, since it is not necessary to arrange the motor and waveform generator on the same axis, it is possible to alleviate assembly work restrictions, improve assembly work efficiency, facilitate maintenance, and simplify the sealed structure. However, oil leakage can be prevented.

In a relatively preferred case, the transmission mechanism has a first transmission unit and a second transmission unit. The first transmission unit is connected to the drive shaft of the motor and rotated by the drive force of the motor. The second transmission unit is connected to the input end of the waveform generator and interlocks with the first transmission unit.

In a relatively preferred case, the first transmission unit and the second transmission unit are meshing gears. The second transmission unit rotates the waveform generator in conjunction with the first transmission unit.

In a relatively preferred case, the ratio of the number of teeth of the first transmission unit and the second transmission unit is 1:1, 1:2 or 2:1, so that it can be adjusted according to actual needs.

In a relatively preferred case, the first transmission unit and the second transmission unit are pulleys. Since the first transmission unit and the second transmission unit are surrounded by a belt, the second transmission unit rotates the waveform generator while interlocking with the first transmission unit via the belt.

In a relatively preferred case, the first transmission unit and the second transmission unit are meshing bevel gears. The second transmission unit rotates the waveform generator in conjunction with the first transmission unit.

In a relatively preferred case, the first transmission unit is a worm. The second transmission unit is a worm wheel. Since the first transmission unit and the second transmission unit mesh with each other, the second transmission unit can rotate the waveform generator while interlocking with the first transmission unit.

In a relatively favorable case, the arrangement of the waveform generator and the drive shaft varies depending on the different constructions of the parts forming the first transmission unit and the second transmission unit. In other words, the axial direction of the waveform generator should be parallel to the axial direction of the drive shaft, the axial direction of the waveform generator should be perpendicular to the axial direction of the drive shaft, or the axial direction of the waveform generator should be parallel to the axial direction of the drive shaft. It can be placed perpendicular to the direction.

In a relatively preferred case, the second transmission unit has a second shaft bore. The second axial hole and the first axial hole of the waveform generator are coaxially interconnected and form a wiring passageway with the second opening of the base. Since the electrical wiring does not come into contact with the motor and passes through the wiring path, it will not be damaged by the heat of the motor.

The detailed structure, features, assembly or usage method of the hollow speed reduction mechanism according to the present invention will be clarified through the detailed description of the embodiments below. It should be noted that the following detailed description and the embodiments disclosed by the present invention are merely examples for explaining the present invention, and it is understood by those with common sense in the field related to the present invention that the scope of the claims of the present invention cannot be limited. If so, you should be able to understand it.

FIG. 1 is a perspective view showing a hollow speed reduction mechanism according to a first embodiment of the present invention. 1 is an exploded perspective view showing a hollow speed reduction mechanism according to a first embodiment of the present invention; FIG. FIG. 1 is a sectional view showing a hollow speed reduction mechanism according to a first embodiment of the present invention. FIG. 3 is a sectional view showing a hollow speed reduction mechanism according to a second embodiment of the present invention. FIG. 7 is a sectional view showing a hollow speed reduction mechanism according to a third embodiment of the present invention. FIG. 7 is a sectional view showing a hollow speed reduction mechanism according to a fourth embodiment of the present invention.

Hereinafter, the hollow type speed reduction mechanism according to the present invention will be explained based on the drawings. Note that in the specification and drawings, directional terms are expressed based on the direction in the drawings. The same reference numerals indicate features of the construction of the same or similar parts.

(First embodiment)
As shown in FIGS. 1 and 2, the hollow speed reduction mechanism 10 according to the first embodiment of the present invention includes a base 20, a motor 30, a wave gearing device 40, and a transmission mechanism 50.

The base 20 is composed of a pedestal 21 and a fixed plate 27. The pedestal 21 has a bottom portion 22, a peripheral wall surface 23, and a storage chamber 24. The peripheral wall surface 23 is arranged to surround the outer peripheral edge of the bottom portion 22 . The storage chamber 24 is formed between the peripheral wall surface 23 and the bottom portion 22, and has an upward opening. The bottom portion 22 has a second opening 25 and a third opening 26 adjacent to each other. The second opening 25 and the third opening 26 penetrate the top and bottom surfaces of the bottom portion 22 and are connected to the storage chamber 24 .
The fixing plate 27 is fixed to the top surface of the pedestal 21 with screws and shields the storage chamber 24. The fixing plate 27 has a first opening 28 and a mounting groove 29. The first opening 28 penetrates the top and bottom surfaces of the fixing plate 27, connects to the storage chamber 24, and is arranged coaxially with the second opening 25. The mounting groove 29 is annularly arranged around the first opening 28 .

The motor 30 is fixed to the bottom surface of the bottom part 22 of the pedestal 21 with a screw, and has a drive shaft 32. The drive shaft 32 is inserted into the storage chamber 24 from the third opening 26.

Wave gearing 40 has a housing 41 , a flexspline 42 , a circular spline 43 and a waveform generator 45 . The housing 41 is fixed to the mounting groove 29 of the fixed plate 27 of the base 20 with screws. The flexspline 42 is mounted within the housing 41 and fixed to the fixed plate 27 of the base 20 with screws. The circular spline 43 is installed between the housing 41 and the flexspline 42 and has a cross roller bearing 44 between it and the housing 41, so that it can rotate together with the flexspline 42 toward the housing 41.
The circular spline 43 and the flex spline 42 partially mesh with each other due to the difference in the number of teeth. Waveform generator 45 is mounted within flexspline 42 and has a flexible bearing 49 therebetween so that it can rotate toward flexspline 42 . Waveform generator 45 has an input end 46 , an output end 47 and a first axial hole 48 . The first shaft hole 48 passes through the input end 46 and the output end 47. The input end 46 of the waveform generator 45 is inserted into the base 20 through the first opening 28 in the base 20 .
As shown in FIG. 3, the waveform generator 45 and the drive shaft 32 of the motor 30 are arranged non-coaxially. That is, the rotation center of the waveform generator 45 and the rotation center of the drive shaft 32 of the motor 30 are located on different axes. In this embodiment, the axial direction A2 of the waveform generator 45 is parallel to the axial direction A1 of the drive shaft 32.

The transmission mechanism 50 is stored in the storage chamber 24 of the base 20 and includes a first transmission unit 51 and a second transmission unit 52. In this embodiment, the first transmission unit 51 and the second transmission unit 52 are gears.
As shown in FIGS. 2 and 3, the first transmission unit 51 is connected to the drive shaft 32 of the motor 30 and rotated by the driving force of the motor 30. The second transmission unit 52 meshes with the first transmission unit 51 and is connected to the input end 46 of the waveform generator 45, and is driven by the first transmission unit 51 to rotate the waveform generator 45. The second transmission unit 52 has a second shaft hole 53. The first axial hole 48 of the waveform generator 45, the second axial hole 53, and the second opening 25 of the base 20 are arranged coaxially and connected to each other to form the wiring passage 12. Electrical wiring (not shown in the figure) passes through the wiring passageway 12.

Specifically, when the motor 30 is started, the first transmission unit 51 interlocks the second transmission unit 52 with the driving force of the motor 30. A second transmission unit 52 interlocking with the first transmission unit 51 rotates the waveform generator 45 . The rotating waveform generator 45 causes the circular spline 43 to correspond to the flexspline 42 and rotates. The difference in the number of teeth between the circular spline 43 and the flex spline 42 makes it possible to achieve a high reduction ratio and output high torque.

(Second embodiment)
As shown in FIG. 4, the differences between the first embodiment and the second embodiment are as follows. In the second embodiment, the transmission mechanism 60 includes a first transmission unit 61, a second transmission unit 62, and a belt 63. The first transmission unit 61 and the second transmission unit 62 are pulleys. The belt 63 is arranged between the first transmission unit 61 and the second transmission unit 62. The second transmission unit 62 rotates the waveform generator 45 while interlocking with the first transmission unit 61 via a belt 63 .

(Third embodiment)
As shown in FIG. 5, the differences between the first embodiment and the third embodiment are as follows. In the third embodiment, the transmission mechanism 70 includes a first transmission unit 71 and a second transmission unit 72. The first transmission unit 71 and the second transmission unit 72 are bevel gears. Since the axial direction A2 of the waveform generator 45 and the axial direction A1 of the drive shaft 32 intersect at right angles, the first transmission unit 71 and the second transmission unit 72 can be meshed with each other. Due to the above-described structural features, the second transmission unit 72 can rotate the waveform generator 45 in conjunction with the first transmission unit 71.

(Fourth embodiment)
As shown in FIG. 6, the differences between the first embodiment and the fourth embodiment are as follows. In the fourth embodiment, the transmission mechanism 80 includes a first transmission unit 81 and a second transmission unit 82. The first transmission unit 81 is a worm. The second transmission unit 82 is a worm wheel. Since the axial direction A2 of the waveform generator 45 is perpendicular to the axial direction A1 of the drive shaft 32, the first transmission unit 81 and the second transmission unit 82 can be meshed. Due to the above-described structural features, the second transmission unit 82 can rotate the waveform generator 45 in conjunction with the first transmission unit 81.

In the embodiment described above, the ratio of the number of teeth of the first transmission unit 51, 71, 81 and the second transmission unit 52, 72, 82 is 1:1, 1:2, or 2:1;
A high reduction ratio can be achieved without requiring an increase in the volume of the base 20. Specifically, when the ratio of the number of teeth of the first transmission unit 51, 71, 81 and the second transmission unit 52, 72, 82 is 1:1, a constant speed transmission effect can be produced. When the ratio of the number of teeth of the first transmission unit 51, 71, 81 and the second transmission unit 52, 72, 82 is 1:2, a deceleration effect can be produced. When the ratio of the number of teeth of the first transmission unit 51, 71, 81 and the second transmission unit 52, 72, 82 is 2:1, an acceleration effect can be produced.

To summarize the above, the hollow type reduction mechanism 10 according to the present invention can not only maintain high torque, high precision and high rigidity according to the principle of the wave gearing device 40 after changing the speed in two stages, but also has a small volume and high rigidity. It is possible to realize a reduction ratio and output high torque without using a high-output motor. Due to the above-mentioned structural features, the hollow speed reduction mechanism 10 according to the present invention can be applied to technical fields such as optical inspection, protractor and precision transmission. Further, since it is not necessary to arrange the motor 30 and the waveform generator 45 coaxially, restrictions on assembly work can be relaxed, efficiency of assembly work can be improved, and maintenance can be facilitated. Further, the hollow speed reduction mechanism 10 according to the present invention has a wiring passage 12 consisting of a first shaft hole 48, a second shaft hole 53, and a second opening 25. Since the electrical wiring does not come into contact with the motor 30 and passes through the wiring passage 12, it will not be damaged by the heat of the motor 30.

10 Hollow reduction mechanism 12 Wiring passage 20 Base 21 Pedestal 22 Bottom 22 Surrounding wall surface 24 Storage chamber 25 Second opening 26 Third opening 27 Fixed plate 28 First opening 29 Mounting groove 30 Motor 32 Drive shaft 40 Wave gear device 41 Housing 42 Flex Spline 43 Circular Spline 44 Cross Roller Bearing 45 Waveform Generator 46 Input End 47 Output End 48 First Shaft Hole 49 Flexible Bearing 50 Transmission Mechanism 51 First Transmission Unit 52 Second Transmission Unit 53 Second Shaft Hole 60 Transmission mechanism 61 First transmission unit 62 Second transmission unit 63 Belt 70 Transmission mechanism 71 First transmission unit 72 Second transmission unit 80 Transmission mechanism 81 First transmission unit 82 Second transmission unit A1 Axial direction of drive shaft A2 Waveform Generator axial direction

Claims (5)

Equipped with a base, motor, wave gearing and transmission mechanism,
the base has a first opening;
the motor is mounted on the base and has a drive shaft, the drive shaft is inserted into the base;
The wave gear device is mounted on the base and has a waveform generator, the waveform generator and the drive shaft of the motor are arranged non-coaxially, and the waveform generator is connected to an input end, an output end and a first shaft hole. the first shaft hole passes through the input end and the output end, and the input end is inserted into the base from the first opening of the base,
The transmission mechanism is disposed within the base, and is connected to the drive shaft of the motor and the input end of the waveform generator, and receives the driving force of the motor to rotate the waveform generator. characterized by
Hollow type reduction mechanism. The transmission mechanism has a first transmission unit and a second transmission unit, the first transmission unit is connected to the drive shaft of the motor and rotates by the driving force of the motor, and the second transmission unit is The hollow speed reduction mechanism according to claim 1, wherein the hollow speed reduction mechanism is connected to the input end of the waveform generator and interlocks with the first transmission unit. 3. The first transmission unit and the second transmission unit are gears that mesh with each other, and the second transmission unit rotates the waveform generator in conjunction with the first transmission unit. hollow type reduction mechanism. The hollow speed reduction mechanism according to claim 3, wherein the ratio of the number of teeth of the first transmission unit and the second transmission unit is 1:1, 1:2 or 2:1. The first transmission unit and the second transmission unit are pulleys, and the first transmission unit and the second transmission unit are surrounded by and connected to each other by a belt, and the second transmission unit is connected to the second transmission unit through the belt. The hollow speed reduction mechanism according to claim 2, wherein the waveform generator is rotated in conjunction with the first transmission unit.

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