TWI445893B - Deceleration mechanism and a transimission device utilized - Google Patents

Description

Speed reduction mechanism and transmission device therefor

The invention relates to a speed reduction mechanism and a transmission device therefor.

The speed reduction mechanism is widely used in robots, automobiles and other industries. The common speed reduction mechanism usually achieves deceleration by means of two mutually meshing gears with different diameters.

A speed reduction mechanism includes an internal gear formed on an outer casing thereof, a crankshaft having an eccentric portion disposed in the outer casing body, and a cycloidal wheel provided with gear teeth disposed on the eccentric portion. The cycloidal wheel is interlocked with the eccentric portion of the crankshaft, and the input rotation is decelerated to obtain an output rotation by revolving while meshing with the internal gear. However, in order to achieve a high degree of meshing coincidence and obtain a smooth output, the cycloidal wheel of the above-mentioned speed reduction mechanism usually forms closely arranged teeth on its outer circumferential surface, and the number of gear teeth to be set is large and the overall size of the speed reduction mechanism When restricted, the teeth need to be made very small, and the distance between the teeth in the circumferential direction is also very small, even overlapping interference occurs at the root portion, which makes the manufacturing of the cycloidal wheel and its teeth more difficult. The production cost is high and the structure is complicated.

In view of the above, it is necessary to provide a speed reduction mechanism having a simple structure and a low cost and a transmission device therefor.

A speed reduction mechanism includes a base, a transmission device rotatably coupled to the base, and a power unit fixed to the base, the transmission device including an active component and a driven component, and an active The component comprises a driving wheel, the driven component comprises a driven wheel, the diameter of the driven wheel is larger than the diameter of the driving wheel, the power device provides the driving force of the driving wheel, and the transmission device further comprises a transmission component wound on the driving wheel and the driven wheel, the driven wheel a spiral portion is provided, the spiral portion includes a first parallel channel and a second channel, and the transmission member is wound on the driving wheel at least one turn, and is wound and wound on the driven wheel, and the transmission member is wound from the first channel. , from the second channel.

A transmission device includes an active component, a driven component, and a transmission component wound on the active component and the driven component, the driven component includes a driven wheel, and the driven wheel is provided with a spiral portion, and the spiral portion includes a first channel substantially parallel And the second channel, the transmission member is wound on the active component at least one turn, and is wound and wound on the driven component, and the transmission component is wound from the first channel and is wound out from the second channel.

The above-mentioned speed reduction mechanism realizes the speed reduction transmission by the transmission members wound on the driving wheel and the driven wheel, thereby eliminating the complicated structure of the gears, the structure is simple, and the production cost is low. The winding manner of the transmission parts can increase the length of the contact between the transmission member and the driving wheel and the driven wheel, thereby increasing the friction between the transmission member and the driving wheel and the driven wheel, so as to achieve a good transmission.

100‧‧‧Deceleration mechanism

10‧‧‧Base

30‧‧‧Transmission

11‧‧‧First fixed plate

13‧‧‧Second fixed plate

15‧‧‧Connecting board

111‧‧‧First positioning hole

113‧‧‧Second positioning hole

131‧‧‧third positioning hole

133‧‧‧Four locating holes

17‧‧‧ bearing

31‧‧‧Active parts

33‧‧‧ driven parts

35‧‧‧ Transmission parts

37‧‧‧Fixed components

311‧‧‧Active shaft

313‧‧‧Drive wheel

331‧‧‧ driven shaft

333‧‧‧ driven wheel

3331‧‧·Axle

3332‧‧· Wheel shell

3333‧‧‧ card slot

3334‧‧‧Spiral

3335‧‧‧First channel

3336‧‧‧Second channel

371‧‧‧ Positioning parts

373‧‧‧fasteners

375‧‧‧Flexible parts

3731‧‧‧Fixed block

3733‧‧‧ screws

3736‧‧‧First fixing hole

3737‧‧‧Second fixing hole

3738‧‧‧ fastening screws

3735‧‧‧ head

319, 337, 339‧‧‧Flange

1 is a perspective assembled view of a speed reduction mechanism according to an embodiment of the present invention.

2 is an exploded perspective view of the speed reduction mechanism shown in FIG. 1.

Figure 3 is an assembled, isometric view of the transmission used in the reduction mechanism shown in Figure 1.

Figure 4 is an exploded perspective view of the transmission shown in Figure 3.

The speed reduction mechanism of the present invention and the use thereof will be described below with reference to the accompanying drawings and specific embodiments. The transmission is described in further detail.

Referring to FIG. 1, a speed reduction mechanism 100 according to an embodiment of the present invention can be applied to a mechanical device such as a robot. The speed reduction mechanism 100 includes a base 10 and a transmission 30 disposed on the base 10.

Referring to FIGS. 1 and 2 , the base 10 includes a first fixed plate 11 and a second fixed plate 13 that are substantially parallel, and a connecting plate 15 that is connected between the first fixed plate 11 and the second fixed plate 13 . A first positioning hole 111 and a second positioning hole 113 are defined in the first fixing plate 11 . A third positioning hole 131 and a fourth positioning hole 133 are defined in the second fixing plate 13 . A bearing 17 is mounted in each of the four positioning holes 111, 113, 131, and 133.

The transmission 30 includes an active component 31, a driven component 33, a transmission member 35, and a stationary assembly 37.

The driving member 31 includes a driving shaft 311 and a driving wheel 313 protrudingly formed outside the driving shaft 311. The two ends of the driving shaft 311 pass through the first positioning hole 111 of the first fixing plate 11 and the bearing 17 of the third positioning hole 131 of the second fixing plate 13, respectively.

Referring to FIGS. 2 to 4 , the driven member 33 includes a driven shaft 331 and a driven wheel 333 that is rotatably sleeved on the driven shaft 331 . The two ends of the driven shaft 331 pass through the second positioning hole 113 of the first fixing plate 11 and the bearing 17 of the fourth positioning hole 133 of the second fixing plate 13, respectively. The driven wheel 333 includes an axle 3331 that is sleeved on the driven shaft 331 and a wheel housing 3332 that is wrapped around the outside of the axle 3331. The wheel housing 3332 is radially provided with a card slot 3333, and a spiral portion 3334 is disposed in the circumferential direction. The spiral portion 3334 extends from the one end of the card slot 3333 to the other end of the card slot 3333. The axle 3331 and the wheel housing 3332 can be made of the same material and are made of different materials. In this embodiment, the material density of the axle 3331 is smaller than the material density of the wheel housing 3332, and the axle 3331 is made of aluminum alloy, and the wheel housing 3332 is used. Made of steel, the driven wheel 333 has both sufficient strength and weight to reduce the moment of inertia of the driven wheel 333. The number of the spiral portions 3334 is three, and is disposed substantially in parallel on the wheel housing 3332. Each spiral 3334 includes a first channel 3335 and a second channel 3336. The distance A between the first channel 3335 and the second channel 3336 is equal to the product of the number of windings of the transmission member 35 on the driving wheel 313 and the diameter of the transmission member 35, so as to prevent the transmission member 35 from interfering during the movement of the speed reducing mechanism 100. . For the purpose of deceleration, the diameter of the driven wheel 333 is larger than the diameter of the driving wheel 313, and the diameter ratio of the two is the transmission ratio. The transmission ratio can be determined according to actual needs. In the present embodiment, the diameter of the driven wheel 333 is six times the diameter of the driving wheel 313. In addition, to ensure a good transmission, the pitch of the first channel 3335 and the second channel 3336 (i.e., the difference in height between the start and end points of the spiral) is equal to the product of the diameter of the transmission member 35 and the transmission ratio.

The number of the transmission members 35 is three, and the substantially "" type is wound around the driving wheel 313 and the driven wheel 333. The three transmission members 35 are located at a portion of the driven wheel 333 and are respectively wound in the three spiral portions 3334 of the wheel housing 3332. Each of the transmission members 35 is wound around the driving wheel 313 at least one turn, and is wound on the driven wheel 333 after being crossed. The transmission member 35 has a drop at the two ends after the driving wheel 313 is wound, so that one end of the transmission member 35 is wound into the first channel 3335 of the spiral portion 3334 of the driven wheel 333, and the other end is wound around the spiral portion 3334 of the driven wheel 333. In the second channel 3336. It can be understood that the number of turns of the transmission member 35 wound on the driving wheel 313 can be determined according to the friction between the transmission member 35 and the driving wheel 313 and the power of the required transmission. In the present embodiment, each transmission member 35 is The driving wheel 313 is wound twice. The transmission member 35 can be a wire rope, a steel belt or the like, and only needs sufficient strength and toughness to ensure a good transmission. In the embodiment, the transmission member 35 is a steel wire rope, and the transmission precision of the steel wire rope is high, no backlash, good rigidity, and good transmission stability.

The fixing assembly 37 includes a positioning member 371, a fastener 373, and an elastic member 375. In this embodiment, the number of the fixing components 37 is two, which are respectively located at opposite ends of the card slot 3333 of the driven wheel 333. The positioning member 371 is fixedly connected to the driven wheel 333 by a screw (not shown), and the two positioning members 371 respectively abut against the two ends of the slot 3333. The fastener 373 includes a fixing block 3731 and a screw 3733 screwed through the positioning member 371 and the fixing block 3731. The fixing block 3731 is provided with a first fixing hole 3736 and a second fixing hole 3737. One end of the transmission member 35 passes through the first fixing hole 3736 of a fixing block 3731, and is bent and then fixed from the second fixing block 3731. The hole 3737 is pierced and fixedly coupled to the fixing block 3731 by a fastening screw 3738. The other end of the transmission member 35 is fixedly coupled to the other fixing block 3731 in the same manner. The screw 3733 has a head 3735. The elastic member 375 is formed by stacking a plurality of disc-shaped elastic pieces, and is sleeved on the screw 3733 and respectively abuts against the head 3735 of the screw 3733 and the positioning member 371.

When the speed reduction mechanism 100 is assembled, the active component 31 of the transmission device 30 is first rotatably connected to the base 10 by a bearing 17, and one end of the drive shaft 311 is connected to the second fixing plate 13 of the base 10 by the flange 319, and the other end is used. It is connected to the power unit (not shown). The driven member 33 is rotatably connected to the base 10 via a bearing 17, and the driven shaft 331 is connected to the first fixing plate 11 of the base 10 via a flange 337, and the other end is connected to the other device by the output flange 339 (not shown). )connection. One end of the transmission member 35 is fixed in the fixing block 3731 of the fixing assembly 37, and after being wound for a length in the first channel 3335 of the spiral portion 3334 of the driven wheel 333, the first channel 3335 is extended from the first channel 3335 and surrounds the driving wheel 313. After the plurality of turns, the driving wheel 313 extends into the second channel 3336 of the spiral portion 3334, and the other end of the transmission member 35 is fixed in the fixing block 3731 of the other fixing member 37. The transmission member 35 forms an intersection between the driving wheel 313 and the driven wheel 333 so as to be wound around the driving wheel 313 and the driven wheel 333 in a substantially "" shape. The two ends of the transmission member 35 are respectively screwed and fixed by the screw 3373 through the positioning member 371 and the fixing block 3731, and the transmission member is secured. 35 is tightly wound around the driving wheel 313 and the driven wheel 333.

When the speed reduction mechanism 100 is in operation, the power unit drives the driving wheel 313 to rotate. For convenience of description, in the present embodiment, it is assumed that the driving wheel 313 is rotated in the X direction (ie, rotated in the clockwise direction), and the movement of one of the transmission members 35 is performed. Description. When the driving wheel 313 is rotated in the X direction, a part of the transmission member 35 wound around the driving wheel 313 is turned into the first channel 3335 of the spiral portion 3334 of the driven wheel 333, and correspondingly the transmission member 35 is located in the second channel. The portion of the 3336 which is close to the driving wheel 313 is pulled out from the second channel 3336 and wound around the driving wheel 313. Since the transmission member 35 is tightly wound around the driving wheel 313 and the driven wheel 333, the transmission member 35 The friction with the two drives the driven wheel 333 to rotate in the opposite direction of the X direction. As the driving wheel 313 continues to rotate, the transmission member 35 located in the first channel 3335 will become longer and longer, and accordingly, the transmission member 35 located in the second channel 3336 will become shorter and shorter. Therefore, after the driving wheel 313 is rotated by a predetermined number of turns in the X direction, the power device automatically adjusts the rotation of the driving wheel 313 in the opposite direction of the X direction. Accordingly, the driven wheel 333 rotates in the X direction, and the rotation principle of the process is performed. The same principle as the above rotation. The driving wheel 313 and the driven wheel 333 have different diameters, and the driving wheel 313 needs to rotate a predetermined number of turns to make the driven wheel 333 rotate one turn, so that the purpose of deceleration can be achieved.

The speed reduction mechanism 100 of the embodiment of the present invention realizes the speed reduction transmission by the transmission member 35 wound on the driving wheel 313 and the driven wheel 333, thereby eliminating the complicated structure of the gear, and the like, and the structure is simple and the production cost is low. The "" type winding method can increase the length of the transmission member 35 in contact with the driving wheel 313 and the driven wheel 333, thereby increasing the frictional force between the transmission member 35 and the driving wheel 313 and the driven wheel 333 to achieve good transmission.

In addition, the spiral portion 3334 for accommodating the transmission member 35 on the driven wheel 333 is disposed as the first channel 3335 and the second channel 3336 which are substantially parallel, and the same transmission member 35 has a The portion is located in the first channel 3335, and the other portion is located in the second channel 3336. The distance between the first channel 3335 and the second channel 3336 is A, so that the transmission member 35 does not overlap at the intersection, which can be avoided. During the rotation process, the transmission member 35 wears due to its own contact, and the service life of the transmission member 35 is prolonged.

Further, the elastic member 375 maintains the transmission member in a tension state by the elastic restoring force. When the transmission member 35 is loosened beyond the elastic restoring force of the elastic member 375 after being used for a long time, the screw can be tightened. The 3733 compresses the elastic member 375 so that the transmission member 35 is again tightened, thereby preventing the occurrence of slippage and the like.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

30‧‧‧Transmission

35‧‧‧ Transmission parts

311‧‧‧Active shaft

313‧‧‧Drive wheel

331‧‧‧ driven shaft

333‧‧‧ driven wheel

3331‧‧·Axle

3332‧‧· Wheel shell

3333‧‧‧ card slot

371‧‧‧ Positioning parts

373‧‧‧fasteners

375‧‧‧Flexible parts

3731‧‧‧Fixed block

3733‧‧‧ screws

3736‧‧‧First fixing hole

3737‧‧‧Second fixing hole

3738‧‧‧ fastening screws

Claims (13)

A speed reduction mechanism includes a base and a transmission device rotatably coupled to the base, the transmission device comprising an active component and a driven component, the active component comprising a driving wheel, the driven component comprising a driven wheel, the driven wheel having a diameter larger than the The diameter of the driving wheel is improved in that the transmission device further comprises a transmission member wound on the driving wheel and the driven wheel, the driven wheel is provided with a spiral portion, and the spiral portion comprises a first channel substantially parallel and a second portion In the channel, the transmission member is wound on the driving wheel by at least one turn, and is wound and wound on the driven wheel. The transmission member is wound from the first channel and is wound out from the second channel. The speed reduction mechanism of claim 1, wherein the transmission device further comprises a fixing assembly for fixing the end of the transmission member, the fixing assembly being fixedly coupled to the driven wheel. The speed reduction mechanism of claim 2, wherein the fixing assembly comprises a positioning member fixed to the driven wheel and a fastener connected to the positioning member, the fastener being fixedly coupled to the transmission member. The speed reduction mechanism of claim 3, wherein the fixing assembly further comprises an elastic member, the fastener comprises a screw, the screw has a head, the elastic member is sleeved on the fastener, and is clamped on the fastener Between the head of the fastener and the positioning member. The speed reduction mechanism of claim 2, wherein the driven wheel is provided with a card slot, the number of the fixing components is two, and the positioning components of each fixing component are respectively clamped at opposite ends of the card slot, The two ends of the transmission member are respectively fixed to the two fixing components. The speed reduction mechanism of claim 1, wherein the transmission member is a wire rope. The speed reduction mechanism of claim 1, wherein the driven wheel comprises an axle and a wheel housing that is wrapped around the outside of the axle, the material density of the axle being less than the material density of the wheel housing. A transmission device comprising an active component and a driven component, the improvement being: the transmission The utility model further includes a transmission member wound on the active component and the driven component, the driven component comprising a driven wheel, the driven wheel is provided with a spiral portion, and the spiral portion comprises a first channel and a second channel substantially parallel. The transmission member is wound on the active component at least one turn, and is wound and wound on the driven wheel. The transmission member is wound from the first channel and is wound out from the second channel. The transmission device of claim 8, wherein the transmission device further comprises a fixing assembly for fixing the end of the transmission member, the fixing assembly being fixedly coupled to the driven wheel. The transmission device of claim 9, wherein the fixing assembly comprises a positioning member fixed to the driven wheel and a fastener connected to the positioning member, the fastener being fixedly coupled to the transmission member. The transmission device of claim 10, wherein the fixing assembly further comprises an elastic member, the fastener comprises a screw, the screw has a head, the elastic member is sleeved on the fastener, and is clamped on the fastener Between the head of the fastener and the positioning member. The transmission device of claim 10, wherein the driven wheel is provided with a card slot, the number of the fixing components is two, and the positioning members of each fixing component are respectively clamped at opposite ends of the card slot, The two ends of the transmission member are respectively fixed to the two fixing components. The transmission device of claim 8, wherein the transmission member is a wire rope.