CN118391405A - Transmission device - Google Patents

Abstract

The present invention provides a transmission device comprising: the input shaft is provided with a first transmission gear; the planetary carrier comprises a planetary carrier input end disc and a hollow shaft section which are fixedly connected, wherein an input cavity and an output cavity which are sequentially distributed along the axial direction are formed in the inner side of the hollow shaft section, a transmission cavity is formed in the outer side of the hollow shaft section, and a transmission opening which is communicated is formed between the transmission cavity and the input cavity; wherein the input shaft is positioned in the input cavity; the planetary gear is arranged in the transmission cavity, is rotationally connected with an input end plate of the planetary carrier through a planetary shaft, is in transmission connection with the first transmission gear through a transmission opening and is provided with a plurality of rolling pins arranged in the circumferential direction; an inner gear ring having inner teeth engaged with the needle rollers; the output wheel is in transmission connection with the hollow shaft section in the output cavity. The invention solves the problems of large occupied space caused by the arrangement of the hub and the speed reducer side by side.

Description

Transmission device

The present application claims priority from chinese patent application number 2023105719814, filed 5, 17 of 2023. The entire contents of this application are incorporated herein by reference.

Technical Field

The invention relates to the technical field of mechanical transmission, in particular to a transmission device.

Background

The speed reducer for home appliance industries such as sweeping robots and mowing robots mostly adopts a multi-row gear design, and the hub and the speed reducer are arranged side by side, so that the occupied space is large, and the sweeping efficiency of the sweeping robots is reduced.

Disclosure of Invention

The invention provides an ultrathin speed reducer which is arranged in the middle of a hub, so that the occupied space of the traditional hub and the speed reducer which are arranged side by side can be greatly reduced, and the sweeping efficiency of a sweeping robot is improved. .

In order to solve the above problems, the present invention provides a transmission device, including: the input shaft is provided with a first transmission gear; the planetary carrier comprises a planetary carrier input end disc and a hollow shaft section which are fixedly connected, wherein an input cavity and an output cavity which are sequentially distributed along the axial direction are formed in the inner side of the hollow shaft section, a transmission cavity is formed in the outer side of the hollow shaft section, and a transmission opening which is communicated is formed between the transmission cavity and the input cavity; wherein the first transmission gear is positioned in the input cavity; the planetary gear is arranged in the transmission cavity, is rotationally connected with the input end plate of the planetary carrier through a planetary shaft, is in transmission connection with the first transmission gear through the transmission opening, and is provided with a plurality of rolling pins arranged in the circumferential direction; an inner gear ring having inner teeth engaged with the needle rollers; the output wheel is in transmission connection with the hollow shaft section in the output cavity.

The technical effect achieved after the technical scheme is adopted is as follows: the output cavity is a cavity in the hollow shaft section, and the output wheel is driven in the output cavity, so that the diameter of the output wheel can be effectively reduced, the linear speed of the matching position of the output wheel and the hollow shaft section is reduced, and the sealing performance between the output wheel and the hollow shaft section is better under the low linear speed; the input shaft stretches into the input cavity of the hollow shaft section, and the first transmission gear is also positioned at the inner side of the hollow shaft section for transmission, so that the axial size of the whole transmission device can be further reduced, and the application of small-size scenes is realized; the inner teeth of the inner gear ring are matched with the needle rollers, so that the needle rollers perform pure rolling friction on the tooth surfaces of the inner teeth, and compared with involute teeth, the friction force is smaller, and the precision service life is longer; moreover, the needle roller and the internal tooth are meshed for transmission, and the meshing gear clearance is small, so that the transmission error is small, and the device can be used for precise transmission.

Further, the transmission device also comprises a first duplex gear; the first transmission gear is a first gear; the planet wheel comprises a second gear close to the planet carrier input end disc; and two ends of the first duplex gear are respectively meshed with the first gear and the second gear.

The technical effect achieved after the technical scheme is adopted is as follows: the first duplex gear is used for transmitting the power of the first transmission gear to the planet gears and decelerating so as to realize low-speed output.

Further, the drive opening includes a first gear slot proximate the input cavity and a second gear slot proximate the drive cavity; the first duplex gear comprises a third gear and a fourth gear which are coaxially connected, the third gear is arranged in the first gear groove, and the fourth gear is arranged in the second gear groove; the number of teeth of the third gear is larger than that of the fourth gear.

The technical effect achieved after the technical scheme is adopted is as follows: the planet carrier input end disc avoids the third gear and the fourth gear through the first gear groove and the second gear groove, so that the space is saved, and meanwhile, the power transmission of the third gear and the fourth gear and the power transmission of the planet wheel to the planet carrier input end disc are realized; the number of teeth of the third gear is larger than that of the fourth gear, and the effect of speed reduction is achieved.

Further, the planet carrier input end plate further includes: the planet carrier connecting boss is positioned in the transmission cavity and is fixedly connected with one side of the planet carrier input end disc, which is close to the transmission cavity; the first double gear comprises a first double gear shaft, the first double gear shaft is connected with the planet carrier connecting boss, and the third gear and the fourth gear are arranged on the first double gear shaft.

The technical effect achieved after the technical scheme is adopted is as follows: the planet carrier connecting boss is used for fixing the first duplex gear through the first duplex gear shaft, so that the first duplex gear can stably rotate; and when the planet carrier input end disc is pushed by the planet wheel to rotate, the first duplex gear shaft is pushed by the planet carrier connection boss to revolve, so that interference with the first duplex gear in the movement process of the planet carrier input end disc is avoided.

Further, the transmission device further comprises a planet carrier output ring, wherein the planet carrier output ring is positioned in the transmission cavity, and the planet carrier output ring and the planet carrier input end disc are oppositely arranged; the planet wheel is arranged between the planet carrier output ring and the planet carrier input end disc, the planet shaft is respectively and rotatably connected with the planet carrier output ring and the planet carrier input end disc, and the planet wheel is arranged on the planet shaft.

The technical effect achieved after the technical scheme is adopted is as follows: the planet carrier output ring and the planet carrier input end plate realize the support at two ends of the planet wheel, and the planet wheel can stably drive the planet carrier input end plate to rotate in the rotating process. Specifically, the first transmission gear drives the first duplex gear to rotate, the first duplex gear drives the second gear of the planetary gear to rotate, a plurality of rolling pins connected with the second gear can roll on the inner teeth of the first inner gear ring, revolution of the planetary gear is achieved, and the input end plate of the planet carrier is pushed by the planet shaft to achieve rotation, so that power is output to the output gear in the output cavity.

Further, the planet comprises: a first disc on a side remote from the input end disc of the planet carrier; the two ends of the plurality of rolling pins are respectively connected with the first disc and the second gear in a rotating way.

The technical effect achieved after the technical scheme is adopted is as follows: the first disc and the second gear realize the support to a plurality of roller pin both ends to the roller pin can roll in the hole on first disc and the second gear, and when the ring gear was fixed, first roller pin can roll along the internal tooth of first ring gear to promote planet wheel revolution, further promote the rotation of planet carrier input dish, carry out the output of power.

Further, the transmission device includes: the shell is coated on the outer sides of the planet gears, the annular gear and the planet carrier input end disc, and the shell is used for fixing the annular gear in the rotation direction.

The technical effect achieved after the technical scheme is adopted is as follows: one side of the shell corresponding to the input shaft is used for installing a motor, and the shell cannot move when the motor works; the inner side of the shell is used for limiting the annular gear, and when the shell is fixed, the annular gear can be fixed, so that the planet gears can roll on the inner teeth of the annular gear.

Further, the shell comprises a limiting part arranged along the circumferential direction, the inner gear ring comprises a limiting notch arranged along the circumferential direction, and the limiting part is matched with the limiting notch.

The technical effect achieved after the technical scheme is adopted is as follows: after the limiting part is matched with the limiting notch, the movement of the annular gear in the circumferential direction can be blocked by the limiting part, so that the inner teeth of the annular gear cannot rotate when being pushed by the needle rollers of the planet gears, and the needle rollers can roll along the inner teeth; and the inner gear ring and the shell are kept relatively static, and the seal between the inner gear ring and the shell is static, so that the sealing effect is better.

Further, the housing includes: a first housing and an output end cap; the limiting part comprises a first fixing part and a second fixing part; the first fixing part is connected with the first shell, the second fixing part is connected with the output end cover, and the first fixing part and the second fixing part are connected through a first fastener.

The technical effect achieved after the technical scheme is adopted is as follows: after the shell is split into a first shell and an output end cover, components such as a planet wheel, an annular gear, a planet carrier input end disc and the like can be conveniently installed in the shell; the limiting part is a first fixing part and a second fixing part, namely the limiting part is used as a first fastener to connect the first shell and the position of the output end cover, and the fixing position is not required to be set at other positions, so that the limiting part simultaneously achieves the two effects of limiting and connecting the first shell and the output end cover, and the inner space of the shell is saved.

Further, the first shell comprises a circumferential shell and a motor plate which are fixedly connected, and the motor plate and the output end cover are oppositely arranged; wherein, the motor board is equipped with the dismouting hole, the dismouting hole with spacing portion sets up relatively.

The technical effect achieved after the technical scheme is adopted is as follows: one side of the motor plate, which is far away from the input end disc of the planet carrier, is used for installing a motor, and an input shaft of the motor penetrates through the motor plate to drive the first transmission gear; the first fastener is a screw, the dismounting hole is convenient for extending into dismounting tools such as a screw driver and the like to rotate the screw, and dismounting of the planet carrier input end disc and the second flange is realized.

Further, the transmission device further includes: the first sealing piece and the fender are located on the outer side of the output wheel, and the fender is fixed to the dismounting hole through the first sealing piece.

The technical effect achieved after the technical scheme is adopted is as follows: the fender is fixed in on the output end cover through first sealing member, and output end cover is fixed at transmission during operation, makes the fender more stable on the one hand, is static seal between on the other hand first sealing member and the dismouting hole, and its sealed effect is better.

Further, the transmission device further includes: and the second sealing piece is arranged between the first shell and the output end cover.

The technical effect achieved after the technical scheme is adopted is as follows: the second sealing piece is used for sealing between the first shell and the output end cover, so that foreign matters are prevented from entering the interior of the shell; the first shell and the output end cover are relatively static, and the sealing between the first shell and the output end cover is static, so that the sealing effect is better.

Further, the transmission device further includes: a third seal and/or a first bearing is provided between the first housing and the hollow shaft section.

The technical effect achieved after the technical scheme is adopted is as follows: the first shell is supported on the hollow shaft section through a first bearing, the first shell and the hollow shaft section are sealed through a third sealing piece, and the first shell and the hollow shaft section can rotate relatively through the third sealing piece and/or the first bearing.

Further, the output wheel comprises a bracket and an outer gear ring which are fixed with each other, the outer gear ring is positioned in the output cavity, and the outer gear ring is meshed with the inner teeth of the hollow shaft section through outer teeth; the support is located outside the shell.

The technical effect achieved after the technical scheme is adopted is as follows: after the outer gear ring is meshed with the inner gear ring, the output wheel can rotate along with the input end disc of the planet carrier, specifically, the support of the output wheel rotates along with the outer gear ring to output power, and the support is used for directly rolling in contact with the ground outside the shell or is sleeved with a wear-resistant material layer outside the support so as to roll on the ground better.

Further, the planet carrier input end plate further includes: a baffle plate positioned between the input chamber and the output chamber; the transmission further includes: the support sleeve is positioned in the outer gear ring, and the support sleeve and the partition plate are of an integrated structure or are fixed through a second fastening piece.

The technical effect achieved after the technical scheme is adopted is as follows: the support sleeve is used for supporting the outer gear ring, so that the transmission of the outer gear ring and the inner gear ring is more stable; the partition plate is used for fixing the support sleeve, so that the strength of the support sleeve is improved, and the support sleeve is stably positioned at the position of the axle center; the second fastener realizes the disassembly and replacement of the supporting sleeve.

In summary, each of the above technical solutions of the present application may have one or more of the following advantages or beneficial effects: i) The output cavity is a cavity in the hollow shaft section, and the output wheel is driven in the output cavity, so that the diameter of the output wheel can be effectively reduced, the linear speed of the matching position of the output wheel and the hollow shaft section is reduced, and the sealing performance between the output wheel and the hollow shaft section is better under the low linear speed; ii) the inner teeth of the inner gear ring are matched with the needle rollers, so that the needle rollers perform pure rolling friction on the tooth surfaces of the inner teeth, the friction force is smaller than that of involute teeth, the precision service life is longer, and the needle rollers and the inner teeth are adopted for transmission, so that the meshing tooth gaps are smaller, the transmission error is small, and the device can be used for precision transmission; iii) The limiting part limits the annular gear, so that the needle rollers can roll along the internal teeth to realize revolution of the planet gears and rotation of an input end plate of the planet carrier, and the input end plate of the planet carrier drives the output wheel to output power in the output cavity; iv) static seal is arranged between the inner gear ring and the shell, and static seal is also arranged between the mud guard and the shell, so that the sealing effect is better; v) the disassembly hole for installing the mudguard can also be used for disassembling and assembling the first fastener, so that the first shell and the output end cover can be disassembled and assembled conveniently.

Drawings

FIG. 1 is a schematic diagram of a transmission device according to an embodiment of the present invention;

FIG. 2 is a schematic illustration of the transmission of FIG. 1;

FIG. 3 is a cross-sectional view taken along the direction A-A in FIG. 1;

FIG. 4 is a cross-sectional view taken along the direction B-B in FIG. 1;

FIG. 5 is a cross-sectional view taken along the direction C-C in FIG. 1;

FIG. 6 is a schematic view of the internal structure of the transmission of FIG. 1;

FIG. 7 is an exploded view of FIG. 6;

fig. 8 is an exploded view of the other view of fig. 6.

Reference numerals illustrate:

100-transmission device; 101-a transmission cavity; 102-a planet carrier output ring; 103-a fender; 110-an input shaft; 111-a first transmission gear; 120-a planet carrier input disc; 122-hollow shaft section; 122 a-an input chamber; 122 b-an output chamber; 123-a first gear slot; 124-a second gear slot; 125-a planet carrier connection boss; 126-a separator; 127-supporting sleeve; 130-planet wheels; 131-rolling pins; 132-a second gear; 133-a first disc; 134-planetary shaft; 140-an inner gear ring; 150-an output wheel; 151-a stent; 152-an outer ring gear; 160-a first double gear; 161-third gear; 162-fourth gear; 163-a first duplicate gear shaft; 170-a housing; 171-a limit part; 171 a-a first securing portion; 171 b-a second securing portion; 172-a first housing; 172 a-a circumferential housing; 172 b-motor plate; 173-an output end cap; 174-dismounting holes; 175—a first seal; 176-a second seal; 177-a third seal; 178-first bearing.

Detailed Description

The invention aims to provide a transmission device which is used for improving the output effect of an inner gear ring used for output in a speed reducer with a planetary structure.

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

Referring to fig. 1-8, the present invention provides a transmission 100 comprising: an input shaft 110, the input shaft 110 being provided with a first transmission gear 111; the planetary carrier input end plate 120 and the hollow shaft section 122 are fixedly connected, an input cavity 122a and an output cavity 122b which are sequentially distributed along the axial direction are arranged on the inner side of the hollow shaft section 122, a transmission cavity 101 is arranged on the outer side of the hollow shaft section 122, and a transmission opening communicated with the transmission cavity 101 and the input cavity 122a is formed; wherein the first transmission gear 111 is located in the input cavity 122a; the planet wheel 130 is arranged in the transmission cavity 101, the planet wheel 130 is rotationally connected with the planet carrier input end plate 120 through a planet shaft 134, the planet wheel 130 is in transmission connection with the first transmission gear 111 through a transmission opening, and the planet wheel 130 is provided with a plurality of rolling pins 131 which are circumferentially arranged; an inner gear ring 140, the inner gear ring 140 having inner teeth engaged with the needle rollers 131; the output wheel 150, the output wheel 150 is in transmission connection with the hollow shaft section 122 in the output cavity 122 b.

In this embodiment, the output cavity 122b is a cavity inside the hollow shaft section 122, and the output wheel 150 is driven in the output cavity 122b, so that the diameter of the output wheel 150 can be effectively reduced, and the linear speed of the matching position of the output wheel 150 and the hollow shaft section 122 is reduced, and the sealing performance between the output wheel 150 and the hollow shaft section 122 is better at low linear speed; the input shaft 110 extends into the input cavity 122a of the hollow shaft section 122, and the first transmission gear 111 is also positioned at the inner side of the hollow shaft section 122 for transmission, so that the overall axial size of the transmission device 100 can be further reduced, and the application of small-size scenes can be realized; the inner teeth of the inner gear ring 140 are matched with the needle rollers 131, so that the needle rollers 131 perform pure rolling friction on the tooth surfaces of the inner teeth, and therefore, compared with involute teeth, the friction force is smaller, and the precision life is longer; further, since the needle roller 131 and the internal teeth are engaged to perform transmission, the backlash of the engagement is small, and thus the transmission error is small, and the device can be used for precision transmission.

In a specific embodiment, the transmission 100 further includes a first double gear 160; the first transmission gear 111 is a first gear; the planet gears 130 include a second gear 132 adjacent the planet carrier input end disk 120; the first duplex gear 160 is engaged with the first gear and the second gear 132 at both ends thereof, respectively. The first duplex gear 160 is used for transmitting the power of the first transmission gear 111 to the planet gear 130, and decelerating, so as to realize low-speed output.

In a particular embodiment, the drive opening includes a first gear slot 123 proximate the input cavity 122a and a second gear slot 124 proximate the drive cavity 101; the first duplex gear 160 comprises a third gear 161 and a fourth gear 162 which are coaxially connected, the third gear 161 is arranged in the first gear groove 123, and the fourth gear 162 is arranged in the second gear groove 124; the number of teeth of the third gear 161 is greater than the number of teeth of the fourth gear 162. Wherein, the planet carrier input end disc 120 avoids the third gear 161 and the fourth gear 162 through the first gear groove 123 and the second gear groove 124, so that the power transmission of the third gear 161 and the fourth gear 162 and the power transmission of the planet wheel 130 to the planet carrier input end disc 120 are realized while saving space; the number of teeth of the third gear 161 is larger than that of the fourth gear 162, and the effect of deceleration is achieved.

In a specific embodiment, the carrier input disc 120 further comprises: the planet carrier connecting boss 125, the planet carrier connecting boss 125 is located in the transmission cavity 101 and is fixedly connected with one side of the planet carrier input end plate 120, which is close to the transmission cavity 101; the first duplicate gear 160 includes a first duplicate gear shaft 163, the first duplicate gear shaft 163 is connected with the planet carrier connection boss 125, and the third gear 161 and the fourth gear 162 are disposed on the first duplicate gear shaft 163. The planet carrier connecting boss 125 fixes the first duplicate gear 160 through the first duplicate gear shaft 163, so that the first duplicate gear 160 can stably rotate; and, the planet carrier connecting boss 125 and the first duplicate gear shaft 163 are connected as a whole, so that when the planet carrier input end plate 120 is pushed by the planet gears 130 to rotate, the first duplicate gear shaft 163 is pushed by the planet carrier connecting boss 125 to revolve, thereby avoiding interference with the first duplicate gear 160 in the movement process of the planet carrier input end plate 120.

Preferably, the carrier connecting boss 125 may be located at a side of the fourth gear 162 away from the third gear 161, or may be located between the fourth gear 162 and the third gear 161, which is not limited herein.

In a specific embodiment, the transmission 100 further includes a planet carrier output ring 102, the planet carrier output ring 102 being located in the transmission cavity 101, the planet carrier output ring 102 being disposed opposite the planet carrier input end plate 120; the planetary gear 130 is disposed between the carrier output ring 102 and the carrier input disc 120, and the planetary shaft 134 is rotatably connected to the carrier output ring 102 and the carrier input disc 120, respectively, and the planetary gear 130 is mounted on the planetary shaft 134. The planet carrier output ring 102 and the planet carrier input end plate 120 support two ends of the planet wheel 130, and the planet wheel 130 can stably drive the planet carrier input end plate 120 to rotate in the rotating process. Specifically, the first transmission gear 111 drives the first double gear 160 to rotate, the first double gear 160 drives the second gear 132 of the planetary gear 130 to rotate, so that the plurality of needle rollers 131 connected to the second gear 132 can roll on the inner teeth of the first ring gear 140 to realize revolution of the planetary gear 130, and the planet carrier input end plate 120 is pushed by the planet shaft 134 to realize rotation, so that power is output to the output wheel 150 in the output cavity 122 b.

Preferably, the planet carrier output ring 102 is attached to the planet carrier attachment boss 125 and attached by fasteners that are staggered in sequence along the circumference of the planet carrier output ring 102 with the planet axle 134 to provide more stable movement of all of the planet gears 130.

In a specific embodiment, the planet 130 includes: a first disc 133 on a side remote from the carrier input disc 120; the plurality of needle rollers 131 are circumferentially arranged between the first disc 133 and the second gear 132, and two ends of the plurality of needle rollers 131 are respectively and rotatably connected with the first disc 133 and the second gear 132. The first disc 133 and the second gear 132 support two ends of the plurality of needle rollers 131, and the needle rollers 131 can roll in holes on the first disc 133 and the second gear 132, when the inner gear ring 140 is fixed, the first needle rollers 131 can roll along inner teeth of the first inner gear ring 140, so as to push the planet gears 130 to revolve, further push the planet carrier input end disc 120 to rotate, and output power.

Preferably, a pin sleeve (not shown in the figure) can be sleeved outside the needle roller 131, namely, the needle roller 131 is respectively in rotary connection with the first disc 133 and the second gear 132 through the pin sleeve, and the pin sleeve plays a role in protecting the needle roller 131, so that the needle roller 131 is prevented from being rubbed, and the precision life of the needle roller 131 is prolonged.

In a specific embodiment, the transmission 100 includes: the casing 170, the casing 170 covers the planetary gear 130, the ring gear 140, and the carrier input disc 120, and the casing 170 fixes the ring gear 140 in the rotational direction. Wherein, one side of the housing 170 corresponding to the input shaft 110 is used for installing a motor, and the housing 170 does not move when the motor works; the inner side of the housing 170 is used for limiting the ring gear 140, and when the housing 170 is fixed, the ring gear 140 can be fixed, so that the planet gears 130 can roll on the inner teeth of the ring gear 140.

Preferably, the housing 170 includes a limiting portion 171 circumferentially disposed, the ring gear 140 includes a limiting notch circumferentially disposed, the limiting portion 171 and the limiting notch cooperate, and movement of the ring gear 140 in the circumferential direction is blocked by the limiting portion 171, so that the inner teeth of the ring gear 140 are not rotated when being pushed by the needle rollers 131 of the planet gears 130, and the needle rollers 131 can roll along the inner teeth; and, the inner gear ring 140 and the shell 170 are kept relatively static, and the seal between the inner gear ring 140 and the shell 170 is static, so that the sealing effect is better.

In a specific embodiment, the housing 170 includes: a first housing 172 and an output end cap 173; the stopper 171 includes a first fixing portion 171a and a second fixing portion 171b; the first fixing portion 171a is connected to the first housing 172, the second fixing portion 171b is connected to the output end cap 173, and the first fixing portion 171a and the second fixing portion 171b are connected by a first fastener. After the housing 170 is split into the first housing 172 and the output end cover 173, the planetary gear 130, the ring gear 140, the planet carrier input disc 120 and other components are conveniently assembled into the housing 170; the limiting part 171 is divided into the first fixing part 171a and the second fixing part 171b, that is, the limiting part 171 is used as a first fastener to connect the first housing 172 and the output end cover 173, and no fixing position is required to be arranged at other positions, so that the limiting part 171 achieves the effects of limiting and connecting the first housing 172 and the output end cover 173 at the same time, and the internal space of the housing 170 is saved.

Preferably, the first fixing portion 171a and the second fixing portion 171b are overlapped in the axial direction, a through hole is provided in the first fixing portion 171a, a screw hole is provided in the second fixing portion 171b, the through hole corresponds to the screw hole, and the first fastener is installed at a side close to the motor and connects the first fixing portion 171a and the second fixing portion 171b.

In a specific embodiment, the first housing 172 includes a fixedly coupled circumferential housing 172a and a motor plate 172b, the motor plate 172b being disposed opposite the output end cap 173; the motor plate 172b has a mounting/dismounting hole 174, and the mounting/dismounting hole 174 is provided opposite to the stopper 171. Wherein, the side of the motor plate 172b far from the planet carrier input end plate 120 is used for installing a motor, and the input shaft 110 of the motor passes through the motor plate 172b to drive the first transmission gear 111; the first fastener, such as a screw, and the mounting and dismounting hole 174 facilitates insertion of a mounting and dismounting tool, such as a screwdriver, into the screw for mounting and dismounting the carrier input disc 120 and the second flange.

Preferably, the width diameter of the motor is smaller than the diameter of the motor plate 172b, and the mounting and dismounting hole 174 is exposed to the circumferential side of the motor, so that the first fastener can be operated to mount and dismount the first housing 172 and the output end cap 173 even in the case where the motor is not dismounted.

In a specific embodiment, the transmission 100 further comprises: the first seal 175 and the fender 103, the fender 103 is located outside the output wheel 150, and the fender 103 is fixed to the attachment/detachment hole 174 via the first seal 175. The fender 103 is fixed on the output end cover 173 through the first sealing member 175, and the output end cover 173 is fixed when the transmission device 100 works, so that on one hand, the fender 103 is more stable, and on the other hand, a static seal is formed between the first sealing member 175 and the dismounting hole 174, and the sealing effect is better.

Preferably, the mudguard 103 comprises a first baffle surrounding the motor; the first baffle is attached to the side wall of the motor, sealing between the first baffle and the motor is achieved, and foreign matters are prevented from entering the dismounting hole 174 from between the first baffle and the side wall of the motor.

Preferably, a protruding portion is disposed on a side of the first baffle facing the mounting hole 174, the protruding portion extends into the mounting hole 174, and the first sealing member 175 seals between the protruding portion and an inner wall of the mounting hole 174, so that foreign matters are prevented from entering the mounting hole 174 from an inner side of the fender 103.

Further, the protruding portion is, for example, a cylindrical structure, and the inner wall of the first sealing member 175 is, for example, a circular hole matching with the protruding portion, so as to seal between the protruding portion and the first sealing member 175 and fix the fender 103. The mud guard 103 may be further connected to the motor plate 172b by a fastener, which is not limited herein.

Preferably, the first sealing member 175 is further provided with a flange surrounding the outer periphery of the dismounting hole, the flange being engaged with the outer periphery of the dismounting hole, the flange facilitating the snap-action of the first sealing member 175, enabling the quick mounting and dismounting of the first sealing member 175.

In a specific embodiment, the transmission 100 further comprises: a second seal 176, the second seal 176 being disposed between the first housing 172 and the output end cap 173. Wherein the second seal 176 is used for sealing between the first housing 172 and the output end cap 173, preventing foreign matters from entering the interior of the housing 170; the first housing 172 and the output end cap 173 are relatively stationary, and the seal therebetween is a static seal, which provides a better sealing effect.

Preferably, the transmission 100 further comprises: the third seal 177 and/or the first bearing 178, the third seal 177 and/or the first bearing 178 are disposed between the first housing 172 and the hollow shaft section 122. The first housing 172 is supported on the hollow shaft section 122 through a first bearing 178, the first housing 172 and the hollow shaft section 122 are sealed through a third sealing member 177, and the first housing 172 and the hollow shaft section 122 can rotate relatively through the third sealing member 177 and/or the first bearing 178.

Preferably, the output wheel 150 comprises a support 151 and an outer gear ring 152 fixed to each other, the outer gear ring 152 being located in the output cavity 122b, the outer gear ring 152 being meshed with the inner teeth of the hollow shaft section 122 by outer teeth; the bracket 151 is located outside the housing 170. After the outer ring gear 152 is meshed with the inner ring gear 140, the output wheel 150 may rotate along with the carrier input end disc 120, specifically, the support 151 of the output wheel 150 rotates along with the outer ring gear 152 to output power, the support 151 is used for directly rolling in contact with the ground outside the housing 170 or a wear-resistant material layer is sleeved outside the support 151 so as to roll on the ground better.

Preferably, the fender 103 includes a second barrier surrounding the stand 151 with a gap between the second barrier and the stand 151 for accommodating the wear-resistant material layer and ensuring rolling of the stand 151 and the wear-resistant material layer.

In a specific embodiment, the carrier input disc 120 further comprises: a diaphragm 126, the diaphragm 126 being located between the input chamber 122a and the output chamber 122 b; the transmission 100 further includes: the support sleeve 127, the support sleeve 127 is located in the outer gear ring 152, and the support sleeve 127 and the partition plate 126 are of an integral structure or fixed through a second fastener. The support sleeve 127 is used for supporting the outer gear ring 152, so that the transmission of the outer gear ring 152 and the inner gear ring 140 is more stable; the partition plate 126 is used for fixing the support sleeve 127, so that the strength of the support sleeve 127 is improved, and the support sleeve 127 is stably positioned at the axial center; the second fastener enables the removal and replacement of the support sleeve 127.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.

Claims (15)

1. A transmission, comprising:

the input shaft is provided with a first transmission gear;

the planetary carrier comprises a planetary carrier input end disc and a hollow shaft section which are fixedly connected, wherein an input cavity and an output cavity which are sequentially distributed along the axial direction are formed in the inner side of the hollow shaft section, a transmission cavity is formed in the outer side of the hollow shaft section, and a transmission opening which is communicated is formed between the transmission cavity and the input cavity; wherein the first transmission gear is positioned in the input cavity;

The planetary gear is arranged in the transmission cavity, is rotationally connected with the input end plate of the planetary carrier through a planetary shaft, is in transmission connection with the first transmission gear through the transmission opening, and is provided with a plurality of rolling pins arranged in the circumferential direction;

An inner gear ring having inner teeth engaged with the needle rollers;

The output wheel is in transmission connection with the hollow shaft section in the output cavity.

2. The transmission of claim 1, further comprising a first double gear; the first transmission gear is a first gear; the planet wheel comprises a second gear close to the planet carrier input end disc; and two ends of the first duplex gear are respectively meshed with the first gear and the second gear.

3. The transmission of claim 2, wherein the transmission opening includes a first gear slot proximate the input cavity and a second gear slot proximate the transmission cavity; the first duplex gear comprises a third gear and a fourth gear which are coaxially connected, the third gear is arranged in the first gear groove, and the fourth gear is arranged in the second gear groove; the number of teeth of the third gear is larger than that of the fourth gear.

4. A transmission according to claim 3, wherein the planet carrier input disc further comprises: the planet carrier connecting boss is positioned in the transmission cavity and is fixedly connected with one side of the planet carrier input end disc, which is close to the transmission cavity;

The first double gear comprises a first double gear shaft, the first double gear shaft is connected with the planet carrier connecting boss, and the third gear and the fourth gear are arranged on the first double gear shaft.

5. The transmission of claim 4, further comprising a planet carrier output ring located in the transmission cavity, the planet carrier output ring disposed opposite the planet carrier input disc;

The planet wheel is arranged between the planet carrier output ring and the planet carrier input end disc, the planet shaft is respectively and rotatably connected with the planet carrier output ring and the planet carrier input end disc, and the planet wheel is arranged on the planet shaft.

6. A transmission according to any one of claims 2-5, wherein the planet comprises: a first disc on a side remote from the input end disc of the planet carrier;

the two ends of the plurality of rolling pins are respectively connected with the first disc and the second gear in a rotating way.

7. The transmission according to any one of claims 1-5, characterized in that the transmission comprises: the shell is coated on the outer sides of the planet gears, the annular gear and the planet carrier input end disc, and the shell is used for fixing the annular gear in the rotation direction.

8. The transmission of claim 7, wherein the housing includes a circumferentially disposed limit portion, the ring gear includes a circumferentially disposed limit notch, and the limit portion mates with the limit notch.

9. The transmission of claim 8, wherein the housing comprises: a first housing and an output end cap; the limiting part comprises a first fixing part and a second fixing part; the first fixing part is connected with the first shell, the second fixing part is connected with the output end cover, and the first fixing part and the second fixing part are connected through a first fastener.

10. The transmission of claim 9, wherein the first housing comprises a fixedly connected circumferential housing and a motor plate disposed opposite the output end cap;

Wherein, the motor board is equipped with the dismouting hole, the dismouting hole with spacing portion sets up relatively.

11. The transmission of claim 10, further comprising: the first sealing piece and the fender are located on the outer side of the output wheel, and the fender is fixed to the dismounting hole through the first sealing piece.

12. The transmission of claim 9, further comprising: and the second sealing piece is arranged between the first shell and the output end cover.

13. The transmission of claim 9, further comprising: a third seal and/or a first bearing is provided between the first housing and the hollow shaft section.

14. The transmission of claim 7, wherein the output wheel comprises a carrier and an outer gear ring secured to each other, the outer gear ring being located in the output cavity, the outer gear ring being meshed with the inner teeth of the hollow shaft section by outer teeth; the support is located outside the shell.

15. The transmission of claim 14, wherein the planet carrier input disc further comprises: a baffle plate positioned between the input chamber and the output chamber;

the transmission further includes: the support sleeve is positioned in the outer gear ring, and the support sleeve and the partition plate are of an integrated structure or are fixed through a second fastening piece.