CN220134530U - Transmission device and speed reducer with same - Google Patents

Abstract

The application is suitable for the technical field of speed reducers, and provides a transmission device and a speed reducer with the same. The transmission device is used for a speed reducer, the speed reducer comprises a driving part, the transmission device comprises a gear box and a first transmission part, a containing cavity is arranged on the gear box, and the first transmission part is arranged in the containing cavity; the first transmission part comprises a first sun gear and a transmission part, the transmission part can rotate in the accommodating cavity around the axis of the accommodating cavity, and the output end of the driving part is in driving connection with the transmission part; the first sun gear comprises a limiting section, and the transmission piece is axially fixed with the limiting section so as to transmit the power of the transmission piece to the first sun gear; the first sun gear further comprises a transmission section connected with the limiting section, the first transmission part further comprises first planetary gears, and the first planetary gears are meshed with the transmission section and meshed with the cavity wall of the accommodating cavity. The design avoids that the first sun gear can rotate relative to the transmission part, and ensures the stable operation of the transmission device.

Description

Transmission device and speed reducer with same

Technical Field

The application belongs to the technical field of speed reducers, and particularly relates to a transmission device and a speed reducer with the transmission device.

Background

The existing speed reducer comprises a transmission device and a driving device, wherein the driving device is arranged on one side of the transmission device, and an output shaft of the driving device is in driving connection with an input end of the transmission device.

In order to ensure output torque, the existing transmission device is as compact as possible, usually, a planetary gear box is adopted, sun teeth in the planetary gear box are fixedly arranged on a transmission member, the sun teeth are meshed with planetary teeth arranged between the sun teeth and a box wall of the gear box, meanwhile, the planetary teeth are meshed with the box wall of the gear box, and an output end of the driving device is in driving connection with the transmission member in the planetary gear box so as to drive the transmission member to rotate, so that the sun teeth are driven to rotate, and then the planetary teeth are driven to rotate.

However, in order to reduce manufacturing cost, the sun gear in the planetary gear box is usually inserted into the mounting hole on the transmission member in an interference fit manner, so that the sun gear and the transmission member are fixedly connected, but under the condition that the sun gear bears a large torque, the sun gear is easy to rotate relative to the transmission member, that is, the sun gear is easy to slip relative to the transmission member, so that the normal operation of the planetary gear box can be affected.

Disclosure of Invention

The embodiment of the utility model aims to provide a transmission device and a speed reducer with the transmission device, and aims to solve the technical problem that sun gears rotate relative to a transmission part in the prior art.

In order to achieve the above object, according to one aspect of the present utility model, there is provided a transmission device for a speed reducer, the speed reducer including a driving portion, the transmission device including a gear case provided with a housing chamber having a ring gear provided on a chamber wall thereof, and a first transmission portion provided in the housing chamber; the first transmission part comprises first sun teeth and a transmission part which are coaxially arranged, the transmission part is rotatably arranged in the accommodating cavity, the rotation axis of the transmission part is coincident with the axis of the accommodating cavity, and the output end of the driving part is in driving connection with the transmission part; the first sun gear comprises a limiting section, a limiting groove is formed in the transmission piece, the limiting section is arranged in the limiting groove in a penetrating mode, a first transmission structure is arranged on the groove wall of the limiting groove, a second transmission structure is arranged on the outer peripheral surface of the limiting section, one of the first transmission structure and the second transmission structure is a transmission concave part, the other one of the first transmission structure and the second transmission structure is a transmission convex part, and the transmission convex part is arranged in the transmission concave part in a penetrating mode so as to transmit power of the transmission piece to the first sun gear; the first sun gear further comprises a transmission section connected with the limiting section, the first transmission part further comprises first planetary gears, and the first planetary gears are arranged between the transmission section and the cavity wall of the containing cavity, meshed with the transmission section and meshed with the cavity wall of the containing cavity.

Optionally, the first transmission structure is a convex strip, the second transmission structure is a groove, the convex strip can be arranged in the groove in a penetrating way, the convex strip is matched with the groove, the convex strip is a transmission convex part, and the groove is a transmission concave part.

Optionally, the first transmission part further comprises a first carrying member, and the first carrying member is arranged between the first planetary gear and the transmission member; the first transmission part further comprises a first connecting shaft and a first rolling element, the first connecting shaft and the first planetary gear are coaxially arranged, the first end of the first connecting shaft is fixedly arranged on the first carrying element, the first rolling element is sleeved on the periphery of the first connecting shaft and can roll around the periphery of the first connecting shaft, and the first planetary gear is fixedly sleeved on the periphery of the first rolling element.

Optionally, the transmission device further comprises a mounting part and an output part, wherein the mounting part is arranged at one side of the gear box far away from the driving part, and a mounting groove which is correspondingly arranged and communicated with the accommodating cavity is formed in the mounting part; the output part and the first sun gear are coaxially arranged, at least part of the output part is arranged in the mounting groove in a penetrating way, the output part can rotate in the mounting groove around the axis of the first sun gear, the second end of the first connecting shaft is fixedly connected with the output part so as to drive the output part to rotate around the axis of the first sun gear, and the output part is the output end of the transmission device.

Optionally, the transmission device further comprises a connecting bearing, the connecting bearing is arranged between the output part and the groove wall of the mounting groove, the inner ring of the connecting bearing is fixedly sleeved on the outer peripheral surface of the output part, and the outer ring of the connecting bearing is fixedly connected with the groove wall of the mounting groove.

Optionally, one end of the mounting part, which is close to the gear box, is embedded in the accommodating cavity, and a connecting screw penetrating through the gear box and screwed into the mounting part is arranged on the outer surface of the gear box so as to enable the mounting part to be detachably and fixedly connected with the gear box; or, the output part comprises an output body and a limiting body, wherein the output body at least partially penetrates through the mounting groove and can rotate in the mounting groove around the axis of the first sun gear, the limiting body is arranged at one end of the output body close to the gear box and is arranged in the accommodating cavity, the second end of the first connecting shaft is fixedly connected with the limiting body, and the projection surface of the end surface of the limiting body close to the output body, which is projected onto the notch of the mounting groove close to the accommodating cavity, at least partially covers the notch of the mounting groove close to the accommodating cavity; or, the first transmission parts are at least provided with two transmission parts in the extending direction of the accommodating cavity, the driving parts are in driving connection with transmission parts in the first transmission parts which are arranged close to the driving parts in the two first transmission parts, the second ends of the first connecting shafts in the first transmission parts are fixedly connected with transmission parts in the other first transmission parts so as to drive the transmission parts to rotate, and the second ends of the first connecting shafts in the other first transmission parts are fixedly connected with the output parts so as to drive the output parts to rotate around the axes of the first sun teeth; the transmission device further comprises a positioning part which is coaxially arranged with the accommodating cavity, sequentially penetrates through each first sun tooth, penetrates into the output part and is fixedly connected with the output part.

Optionally, the transmission device further comprises a second transmission part, wherein the second transmission part is arranged in the accommodating cavity and is positioned at one side of the first transmission part, which is close to the driving part; the second transmission part comprises a second sun gear, a second planetary gear, a second carrying piece and a second connecting shaft, the second sun gear and the accommodating cavity are coaxially arranged and rotatably arranged in the accommodating cavity, the rotation axis of the second sun gear is overlapped with the axis of the accommodating cavity, the output end of the driving part is in driving connection with the second sun gear, and the second sun gear is the input end of the transmission device; the second planetary gear is arranged between the second sun gear and the cavity wall of the accommodating cavity, meshed with the second sun gear and meshed with the cavity wall of the accommodating cavity; the second carrying piece is arranged on one side, far away from the transmission piece, of the second planetary gear, the first end of the second connecting shaft is fixedly arranged on the second carrying piece, the second planetary gear is sleeved on the periphery of the second connecting shaft, and the second end of the second connecting shaft is fixedly connected with the transmission piece to drive the transmission piece to rotate.

Optionally, the second transmission part further comprises a second rolling element, the second rolling element is sleeved on the periphery of the second connecting shaft and can roll around the periphery of the second connecting shaft, and the second planetary gear is fixedly sleeved on the periphery of the second rolling element.

According to another aspect of the present application, there is provided a speed reducer comprising a drive portion and the transmission device described above, the drive portion being disposed on one side of the transmission device, the output end of the drive portion being drivingly connected to the second sun gear to drive the output portion to rotate about the axis of the receiving chamber.

Optionally, the speed reducer further comprises a connecting portion, the connecting portion is fixedly mounted on the end face, close to the gear box, of the driving portion, external threads are arranged on the outer peripheral face of the connecting portion along the circumferential direction of the connecting portion, internal threads are arranged on the cavity wall of the accommodating cavity, the external threads are in threaded fit with the internal threads, and the end face, close to the connecting portion, of the gear box is fixedly connected with the connecting portion.

The transmission device provided by the application has the beneficial effects that: compared with the prior art, the transmission part rotates around the axis of the accommodating cavity in the accommodating cavity under the action of the driving part, and the transmission part drives the first sun gear to rotate around the axis of the transmission concave part and the transmission convex part in the accommodating cavity; in the process that the first sun gear drives the first planetary gear to rotate, the first planetary gear applies torque for preventing the first sun gear from rotating to the first sun gear, but under the cooperation of the transmission concave part and the transmission convex part, the first sun gear always and stably follows the rotation of the transmission piece to rotate, and the design avoids that the first sun gear rotates relative to the transmission piece, so that the stable operation of the transmission device is ensured.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a speed reducer according to an embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of a reduction gear provided by an embodiment of the present application;

fig. 3 is a schematic structural diagram of a speed reducer with a hidden gear box and a hidden driving part according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a first transmission part according to an embodiment of the present application;

FIG. 5 is an exploded view of a first transmission part according to an embodiment of the present application;

FIG. 6 is an exploded view of an assembled mounting portion and output portion according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of an assembled driving part (without an encoder), a second transmission part and a transmission part according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of an assembled driving portion (with an encoder) and a second transmission portion according to an embodiment of the present application.

Reference numerals related to the above figures are as follows:

100. a driving section; 110. an output shaft; 200. a gear box; 300. a first transmission part; 310. a first sun gear; 311. a limiting section; 3111. a groove; 312. a transmission section; 320. a transmission member; 321. a convex strip; 330. a first planetary gear; 340. a first carrying member; 350. a first connecting shaft; 360. a first rolling member; 400. a mounting part; 500. an output unit; 510. an output body; 520. a limiting body; 600. connecting a bearing; 700. a limit part; 800. a backing ring; 900. clamping springs; 1000. a connecting screw; 1100. a positioning part; 1200. a second transmission part; 1210. a second sun gear; 1220. a second planetary gear; 1230. a second carrying member; 1240. a second connecting shaft; 1250. a second rolling member; 1300. and a connecting part.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element. Embodiments of the application and features of the embodiments may be combined with each other without conflict. The application will be described in detail below with reference to the drawings in connection with embodiments.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

As described in the background art, in order to make the existing transmission device as compact as possible under the premise of ensuring the output torque, a planetary gear box is generally adopted, a sun gear in the planetary gear box is fixedly installed on a transmission member, the sun gear is meshed with a planet gear arranged between the sun gear and a box wall of the gear box, meanwhile, the planet gear is meshed with the box wall of the gear box, and an output end of a driving device is in driving connection with the transmission member in the planetary gear box to drive the transmission member to rotate, so that the sun gear is driven to rotate, and then the planet gear is driven to rotate. However, in order to reduce manufacturing cost, the sun gear in the planetary gear box is usually inserted into the mounting hole on the transmission member in an interference fit manner, so that the sun gear and the transmission member are fixedly connected, but under the condition that the sun gear bears a large torque, the sun gear is easy to rotate relative to the transmission member, that is, the sun gear is easy to slip relative to the transmission member, so that the normal operation of the planetary gear box can be affected.

Referring to fig. 1 to 5, in order to solve the above-described problems, according to an aspect of the present application, an embodiment of the present application provides a transmission for a decelerator including a driving part 100, the transmission including a gear case 200 and a first transmission part 300, the gear case 200 being provided with a receiving cavity having a cavity wall provided with an inner gear ring, the first transmission part 300 being disposed in the receiving cavity; the first transmission part 300 comprises a first sun gear 310 and a transmission piece 320 which are coaxially arranged, the transmission piece 320 is rotatably arranged in the accommodating cavity, the rotation axis of the transmission piece 320 coincides with the axis of the accommodating cavity, and the output end of the driving part 100 is in driving connection with the transmission piece 320; the first sun gear 310 comprises a limiting section 311, a limiting groove is formed in the transmission piece 320, the limiting section 311 is arranged in the limiting groove in a penetrating mode, a first transmission structure is arranged on the groove wall of the limiting groove, a second transmission structure is arranged on the outer peripheral surface of the limiting section 311, one of the first transmission structure and the second transmission structure is a transmission concave part, the other transmission structure is a transmission convex part, and the transmission convex part is arranged in the transmission concave part in a penetrating mode so as to transmit power of the transmission piece 320 to the first sun gear 310; the first sun gear 310 further includes a transmission section 312 connected to the limiting section 311, and the first transmission portion 300 further includes first planetary teeth 330, where the first planetary teeth 330 are disposed between the transmission section 312 and the cavity wall of the accommodating cavity, and are engaged with the transmission section 312 and the cavity wall of the accommodating cavity.

In the embodiment of the application, the driving part 100 is arranged at one side of the transmission device, the accommodating cavity is coaxially arranged with the gear box 200, the first sun gear 310 is coaxially arranged with the accommodating cavity, the transmission piece 320 is a connecting plate, the transmission piece 320 is coaxially arranged with the accommodating cavity, the limiting groove is coaxially arranged with the limiting section 311, the transmission section 312 is arranged at one side of the limiting section 311 away from the driving part 100, and the transmission section 312 and the limiting section 311 are integrally formed; the axial direction of the first planetary gear 330 is parallel to the axial direction of the first sun gear 310, the first planetary gear 330 can rotate around the axial direction of the first sun gear 310 and also can rotate around the axial direction of the first planetary gear 330, the first planetary gear 330 is provided with three, and the three first planetary gears 330 are uniformly spaced around the circumferential direction of the first sun gear 310, although in other embodiments, the first planetary gear 330 can be provided with one, two or other numbers. Furthermore, the drive projection is adapted to the drive recess.

In a specific application, the transmission member 320 rotates around the axis of the accommodating cavity in the accommodating cavity under the action of the driving part 100, and under the cooperation of the transmission concave part and the transmission convex part, the transmission member 320 drives the first sun gear 310 to rotate around the axis of the transmission member in the accommodating cavity, and the first sun gear 310 is meshed with the first planet gear 330, and meanwhile, the first planet gear 330 is meshed with the cavity wall of the accommodating cavity, so that the first planet gear 330 can rotate around the axis of the first sun gear 310 and also can rotate around the axis of the transmission member; in the process that the first sun gear 310 drives the first planet gear 330 to rotate, the first planet gear 330 applies torque to the first sun gear 310 to prevent the first sun gear 310 from rotating, but under the cooperation of the transmission concave part and the transmission convex part, the first sun gear 310 always and stably rotates along with the rotation of the transmission piece 320, so that the design avoids the rotation of the first sun gear 310 relative to the transmission piece 320, and ensures the stable operation of the transmission device.

Referring to fig. 5, in the present embodiment, the first transmission structure is a protrusion 321, the second transmission structure is a groove 3111, the protrusion 321 may be disposed in the groove 3111, the protrusion 321 is adapted to the groove 3111, the protrusion 321 is a transmission protrusion, and the groove 3111 is a transmission recess.

In the embodiment of the present application, the shape of the protruding strip 321 can be any shape, and only the protruding structure protruding from the wall of the limiting groove is required, and the shape of the corresponding groove 3111 only needs to be arranged corresponding to the shape of the protruding strip 321; the extending direction of the groove 3111 is parallel to the axial direction of the limiting segment 311, the groove 3111 extends from the end surface of the limiting segment 311 away from the transmission segment 312 to the direction close to the transmission segment 312, and the length direction of the protruding strip 321 is parallel to the extending direction of the limiting groove. In order to ensure that the first sun gear 310 can stably rotate along with the rotation of the transmission member 320, a plurality of protruding strips 321 are arranged around the circumferential space of the limiting groove, and a plurality of corresponding grooves 3111 are also arranged around the circumferential space of the limiting section 311, wherein the number of the protruding strips 321 is the same as that of the grooves 3111, and the protruding strips 321 are arranged in a one-to-one correspondence manner. Of course, in other embodiments, the first transmission structure may be the groove 3111, and the second transmission structure may be the protrusion 321.

Referring to fig. 5, as an alternative to the embodiment of the present application, the grooves 3111 are communicated with the tooth grooves in the first solar tooth 310, the extending direction of the grooves 3111 is parallel to the extending direction of the tooth grooves, and the length direction of the protruding strips 321 is parallel to the extending direction of the limit grooves. The groove 3111 designed in this way is convenient to process and manufacture, and processing difficulty and manufacturing cost are reduced. In addition, in this alternative, the outer diameter of the transmission section 312 is larger than the outer diameter of the limiting section 311, and the connection between the transmission section 312 and the limiting section 311 is gradually and smoothly transited.

Referring to fig. 2 to 4, the first transmission portion 300 in the present embodiment further includes a first carrying member 340, the first carrying member 340 is disposed between the first planetary gear 330 and the transmission member 320, and an end of the limiting section 311 away from the transmission section 312 passes through the first carrying member 340; the first transmission part 300 further includes a first connecting shaft 350 and a first rolling member 360, the first connecting shaft 350 and the first planetary gear 330 are coaxially disposed, a first end of the first connecting shaft 350 is fixedly mounted on the first mounting member 340, the first rolling member 360 is sleeved on the outer periphery of the first connecting shaft 350 and can roll around the circumference of the first connecting shaft 350, and the first planetary gear 330 is fixedly sleeved on the outer periphery of the first rolling member 360.

In the embodiment of the present application, the first carrying member 340 is a first carrying plate, the first carrying plate and the first sun gear 310 are coaxially arranged, a first through hole is arranged on the first carrying plate, and one end of the limiting section 311, which is far away from the transmission section 312, passes through the first through hole to pass through the first carrying member 340; the number of the first connecting shafts 350 is the same as that of the first planetary teeth 330, the first connecting shafts are arranged in a one-to-one correspondence manner, the first carrying pieces 340 are provided with mounting holes for the first ends of the first connecting shafts 350 to pass through, and the first ends of the first connecting shafts 350 are fixedly arranged in the mounting holes in a penetrating manner in an interference fit manner; the first rolling member 360 is a needle bearing, an inner ring of the needle bearing is fixedly sleeved on the outer periphery of the first connecting shaft 350, and of course, in other embodiments, the first rolling member 360 may also be a needle or a ball, and corresponding fixing members for rolling the needle or the ball are fixedly mounted on the inner ring of the first planetary gear 330. The first rolling member 360 converts sliding friction between the first planetary gear 330 and the first coupling shaft 350 into rolling friction, thereby not only reducing friction noise, but also improving the transmission efficiency of the transmission device, and further extending the service life of the transmission device.

Referring to fig. 1 to 3 and 6, the transmission device in the present embodiment further includes a mounting portion 400 and an output portion 500, the mounting portion 400 is disposed at a side of the gear case 200 away from the driving portion 100, and a mounting groove corresponding to and communicating with the accommodating chamber is disposed on the mounting portion 400; the output part 500 is coaxially arranged with the first sun gear 310, the output part 500 is at least partially penetrated in the mounting groove and can rotate in the mounting groove around the axis of the first sun gear 310, the second end of the first connecting shaft 350 is fixedly connected with the output part 500 so as to drive the output part 500 to rotate around the axis of the first sun gear 310, and the output part 500 is an output end of the transmission device.

In the embodiment of the present application, the mounting portion 400 is fixedly connected with the gear case 200, the mounting groove and the accommodating cavity are through grooves, the mounting groove and the accommodating cavity are coaxially arranged, the notch of the mounting groove close to the accommodating cavity and the notch of the accommodating cavity close to the mounting groove are correspondingly arranged and are communicated with each other, the end face of the output portion 500 close to the first connecting shaft 350 is provided with a mounting hole, the second end of the first connecting shaft 350 is fixedly arranged in the mounting hole in a penetrating manner in an interference fit manner, and one end of the output portion 500 away from the first connecting shaft 350 is in driving connection with an external object.

In a specific application, in the process that the first sun gear 310 drives the first planet gear 330 to rotate, the first connecting shaft 350 drives the output part 500 to rotate, the output part 500 drives an external object to rotate, the external object applies a torque for preventing the output part 500 from rotating to the output part 500, the torque is transmitted to the first sun gear 310 through the first planet gear 330, but under the cooperation of the transmission concave part and the transmission convex part, the first sun gear 310 always and stably follows the rotation of the transmission member 320 to rotate, so that the first sun gear 310 is prevented from rotating relative to the transmission member 320 under the condition of bearing a large torque, and the stable operation of the transmission device is ensured.

Referring to fig. 2 and 6, as an alternative manner in the embodiment of the present application, the transmission device further includes a connection bearing 600, the connection bearing 600 is disposed between the output part 500 and a groove wall of the installation groove, an inner ring of the connection bearing 600 is fixedly sleeved on an outer circumferential surface of the output part 500, and an outer ring of the connection bearing 600 is fixedly connected with the groove wall of the installation groove.

In this alternative manner, the connection bearing 600 is a ball bearing, the inner ring of the connection bearing 600 is fixedly sleeved on the outer peripheral surface of the output portion 500 in an interference fit manner, and the outer ring of the connection bearing 600 is fixedly embedded in the mounting groove in an interference fit manner. The output 500 can be rotated about the axis of the first solar tooth 310 in the mounting groove by using the connection bearing 600 of the present application.

In this alternative, a limiting portion 700 is fixedly sleeved on the outer peripheral surface of the output portion 500, and an end surface of the limiting portion 700 close to the connection bearing 600 is attached to an end surface of the connection bearing 600 far from the gear case 200. In this alternative manner, one end of the output part 500 away from the gear case 200 is located outside the mounting groove, the end face of the connecting bearing 600 away from the gear case 200 is flush with the end face of the mounting part 400 away from the gear case 200, the limiting part 700 is located outside the mounting groove, the limiting part 700 is a limiting ring, the limiting ring can be fixedly sleeved on the outer peripheral surface of the output part 500 in an interference fit manner, and the end face of the limiting part 700 close to the connecting bearing 600 and the end face of the connecting bearing 600 away from the gear case 200 can also be fixedly connected in a welding manner; the provided limiting part 700 reduces the possibility of axial movement of the connection bearing 600 along the axial direction of the output part 500, and ensures smooth operation of the connection bearing 600.

In this alternative, two connection bearings 600 are provided, the two connection bearings 600 are disposed at intervals along the axial direction of the first sun gear 310, and the two connection bearings 600 are disposed between the output part 500 and the groove wall of the installation groove; in order to avoid the contact between the two connecting bearings 600 and thus ensure the smooth running of the two connecting bearings 600, two backing rings 800 are arranged between the two connecting bearings 600 along the axial direction of the first sun gear 310, the two backing rings 800 are coaxially arranged with the first sun gear 310, the end surfaces of the two backing rings 800, which are far away from each other, are respectively attached to the end surfaces of the connecting bearings 600, which are correspondingly arranged, close to the backing rings 800, and the backing rings 800 are copper rings, and in other embodiments, the backing rings 800 can also be rings made of plastic materials; in addition, in order to avoid the two connecting bearings 600 from moving along the axial direction of the first sun gear 310, a clamping spring 900 is arranged between the two backing rings 800, a clamping groove is formed on the groove wall of the mounting groove around the circumference of the mounting groove, the clamping spring 900 is embedded in the clamping groove, and the end surfaces of the two backing rings 800, which are close to each other, are respectively attached to the two end surfaces of the clamping spring 900, so that the clamping spring 900 is tightly attached to the two backing rings 800.

Referring to fig. 2 and 3, as an alternative to the embodiment of the present application, one end of the mounting part 400, which is close to the gear case 200, is embedded in the receiving chamber, and a connection screw 1000, which penetrates the gear case 200 and is screwed into the mounting part 400, is provided on the outer surface of the gear case 200, so that the mounting part 400 is detachably and fixedly connected with the gear case 200. In this alternative manner, the accommodating cavity includes a connecting cavity section and a transmission cavity section, the transmission cavity section is disposed on one side of the connecting cavity section away from the mounting portion 400, the transmission cavity section and the connecting cavity section are coaxially disposed, an inner gear ring is disposed on a cavity wall of the transmission cavity section around a circumference of the transmission cavity section, the first transmission portion 300 is disposed in the transmission cavity section, a cavity wall of the connecting cavity section is smoothly disposed, and one end of the mounting portion 400 close to the gear case 200 is embedded in the connecting cavity section; in order to enhance the connection strength between the mounting part 400 and the gear case 200, four connecting screws 1000 are provided, the four connecting screws 1000 are arranged at intervals around the circumference of the gear case 200, and the provided connecting screws 1000 enable the mounting part 400 to be detachably and fixedly connected with the gear case 200, so that the assembly difficulty and the manufacturing cost of the transmission device are reduced.

Referring to fig. 2, 3 and 6, as an alternative manner in the embodiment of the present application, the output part 500 includes an output body 510 and a limiting body 520, where the output body 510 is at least partially penetrated in the installation groove and can rotate around the axis of the first sun gear 310 in the installation groove, the limiting body 520 is disposed at one end of the output body 510 near the gear case 200, the limiting body 520 is disposed in the accommodating cavity, the second end of the first connecting shaft 350 is fixedly connected with the limiting body 520, and a projection surface of the end surface of the limiting body 520 near the output body 510 projected onto a notch of the installation groove near the accommodating cavity at least partially covers the notch of the installation groove near the accommodating cavity.

In this alternative mode, output body 510 and spacing body 520 coaxial setting, and for integrated into one piece manufacturing, the one end that spacing body 520 was kept away from to output body 510 is located the mounting groove outside, spacing body 520 is located the transmission chamber section, be provided with the mounting hole on the terminal surface that spacing body 520 kept away from output body 510, the second end of first connecting axle 350 adopts interference fit's mode to fix to wear to establish in this mounting hole, the external diameter of spacing body 520 is greater than the mounting groove and is close to the groove diameter that holds the chamber notch, also be greater than the external diameter of output body 510 simultaneously, the terminal surface that the connecting bearing 600 that is close to spacing body 520 set up among two connecting bearings 600 kept away from the terminal surface butt that another connecting bearing 600 is close to output body 510 with spacing body 520. The output part 500 thus provided is not only convenient to be connected with the first transmission part 300, so as to rotate around the axis of the first sun gear 310 in the mounting groove, but also can be stably limited at a desired position, thereby ensuring stable operation of the device.

Referring to fig. 2 and 3, as an alternative way in the embodiment of the present application, at least two first transmission parts 300 are provided along the extending direction of the accommodating cavity, the driving part 100 is in driving connection with the transmission member 320 in the first transmission part 300 provided near the driving part 100 of the two first transmission parts 300, the second end of the first connection shaft 350 in the first transmission part 300 is fixedly connected with the transmission member 320 in the other first transmission part 300 to drive the transmission member 320 to rotate, and the second end of the first connection shaft 350 in the other first transmission part 300 is fixedly connected with the output part 500 to drive the output part 500 to rotate around the axis of the first solar tooth 310; the transmission device further comprises a positioning part 1100, the positioning part 1100 is coaxially arranged with the accommodating cavity, and the positioning part 1100 sequentially penetrates through each first sun tooth 310, penetrates into the output part 500 and is fixedly connected with the output part 500.

In this alternative, the two first transmission parts 300 provided have the effect of reducing the output rotation speed and improving the output torque; the positioning portion 1100 is a positioning column, a through hole is formed in each first solar tooth 310 along the axial direction of the first solar tooth 310, the positioning portion 1100 is arranged in the through hole in a penetrating manner in a clearance fit manner, a fixing hole is formed in the end face, far away from the output body 510, of the limiting body 520, and the positioning portion 1100 is fixedly arranged in the fixing hole in a penetrating manner in an interference fit manner, so that the positioning portion 1100 is fixedly connected with the output portion 500. The positioning portion 1100 provided plays a role in centering during the assembly of the two first transmission portions 300, and avoids the eccentricity of the two first sun gears 310.

Referring to fig. 2, 7 and 8, as an alternative to the embodiment of the present application, the transmission device further includes a second transmission part 1200, and the second transmission part 1200 is disposed in the accommodating cavity and is located at a side of the first transmission part 300 adjacent to the driving part 100; the second transmission part 1200 comprises a second sun gear 1210, a second planet gear 1220, a second carrying member 1230 and a second connecting shaft 1240, wherein the second sun gear 1210 is coaxially arranged with the accommodating cavity and rotatably arranged in the accommodating cavity, the rotation axis of the second sun gear 1210 is coincident with the axis of the accommodating cavity, the output end of the driving part 100 is in driving connection with the second sun gear 1210, and the second sun gear 1210 is the input end of the transmission device; the second planetary teeth 1220 are disposed between the second sun teeth 1210 and the cavity walls of the receiving cavity and engage the second sun teeth 1210 and the cavity walls of the receiving cavity; the second carrying member 1230 is disposed on a side of the second planetary gear 1220 away from the transmission member 320, a first end of the second connecting shaft 1240 is fixedly mounted on the second carrying member 1230, the second planetary gear 1220 is sleeved on the outer periphery of the second connecting shaft 1240, and a second end of the second connecting shaft 1240 is fixedly connected with the transmission member 320 to drive the transmission member 320 to rotate.

In this alternative, the second sun gear 1210 is coaxially disposed with the accommodating cavity, the axial direction of the second planet gear 1220 is parallel to the axial direction of the second sun gear 1210, the second planet gear 1220 can rotate around the axis of the second sun gear 1210 and also can rotate around the axis of the second planet gear 1220, the second planet gears 1220 are three, and the three second planet gears 1220 are uniformly spaced around the circumference of the second sun gear 1210, although in other embodiments, the second planet gears 1220 can be one, two or other numbers. The second carrying member 1230 is a second carrying plate, the second carrying plate and the second sun gear 1210 are coaxially arranged, a second penetrating through hole is formed in the second carrying plate, a mounting hole is formed in the end face, close to the driving part 100, of the second sun gear 1210, and the output end of the driving part 100 penetrates through the second penetrating through hole and penetrates into the mounting hole in an interference fit manner, so that the output end of the driving part 100 is fixedly connected with the second sun gear 1210; the number of the second connecting shafts 1240 is the same as that of the second planetary teeth 1220, the second connecting shafts 1240 are arranged in a one-to-one correspondence manner, the second carrying members 1230 are provided with mounting holes for the first ends of the second connecting shafts 1240 to penetrate through, the first ends of the second connecting shafts 1240 are fixedly penetrated in the mounting holes in an interference fit manner, the end faces, close to the second planetary teeth 1220, of the transmission members 320 are provided with mounting holes for the second ends of the second connecting shafts 1240 to penetrate through, and the second ends of the second connecting shafts 1240 are fixedly penetrated in the mounting holes in an interference fit manner. The second transmission 1200 provided has the effect of reducing the output rotation speed and increasing the output torque, so that the transmission can operate more smoothly.

In this alternative manner, the second transmission portion 1200 further includes a second carrying member 1230, a second connecting shaft 1240, and a second rolling member 1250, where the second carrying member 1230 is disposed on a side of the second planetary gear 1220 away from the transmission member 320, a first end of the second connecting shaft 1240 is fixedly mounted on the second carrying member 1230, the second rolling member 1250 is sleeved on an outer periphery of the second connecting shaft 1240 and can roll around a circumference of the second connecting shaft 1240, the second planetary gear 1220 is fixedly sleeved on an outer periphery of the second rolling member 1250, and a second end of the second connecting shaft 1240 is fixedly connected with the transmission member 320 to drive the transmission member 320 to rotate.

In this alternative, the second rolling member 1250 is a needle bearing, and an inner ring of the needle bearing is fixedly sleeved on the outer periphery of the second connecting shaft 1240, although in other embodiments, the second rolling member 1250 may also be a needle or a ball, and correspondingly, a fixing member for rolling the needle or the ball is fixedly installed on an inner ring of the second planetary gear 1220. The second rolling member 1250 converts sliding friction between the second planetary gear 1220 and the second coupling shaft 1240 into rolling friction, which not only reduces friction noise, but also improves the transmission efficiency of the transmission device, and further prolongs the service life of the transmission device.

Referring to fig. 1 to 8, according to an aspect of the present application, there is provided a decelerator including a driving part 100 and the above-mentioned transmission device, the driving part 100 being disposed at one side of the transmission device, an output end of the driving part 100 being drivingly connected with a second solar tooth 1210 to drive the output part 500 to rotate about an axis of the receiving chamber. In the embodiment of the present application, the driving portion 100 is a driving motor, and the output shaft 110 of the driving motor is coaxially disposed with and fixedly connected to the second sun gear 1210, however, in other embodiments, the driving portion 100 may also be a driving motor, and the output shaft 110 of the driving motor is coaxially disposed with and fixedly connected to the second sun gear 1210. In addition, the side of the driving part 100 remote from the transmission may be provided with an encoder.

In a specific application, the second sun gear 1210 rotates under the driving action of the output end of the driving part 100, so as to drive the second planet gear 1220 to rotate around the axis of the accommodating cavity, the second planet gear 1220 drives the second carrying member 1230 to rotate around the axis of the accommodating cavity, under the action of the second connecting shaft 1240, the transmission member 320 positioned below rotates around the axis of the accommodating cavity, under the action of the transmission concave part positioned below and the transmission convex part positioned below, the transmission member 320 drives the first sun gear 310 positioned below to rotate around the axis of the accommodating cavity, the first planet gear 310 drives the first planet gear 330 positioned below to rotate around the axis of the accommodating cavity, the first planet gear 330 drives the first carrying member 340 positioned below to rotate around the axis of the accommodating cavity, under the action of the first connecting shaft 350 positioned below, the transmission member 320 positioned above rotates around the axis of the accommodating cavity, under the action of the transmission concave part positioned above and the transmission convex part positioned above rotates around the axis of the accommodating cavity, the transmission member 320 drives the first sun gear 310 positioned above rotates around the axis of the accommodating cavity, the first planet gear 330 is driven around the axis of the first planet gear 330 positioned above the accommodating cavity, and the first planet gear 330 is driven around the axis of the first planet gear 330 positioned above the first connecting shaft.

Referring to fig. 2, 7 and 8, the speed reducer in the present embodiment further includes a connection portion 1300, the connection portion 1300 is fixedly mounted on an end face of the driving portion 100 near the gear case 200, an external thread is provided on an outer peripheral face of the connection portion 1300 along a circumferential direction of the connection portion 1300, an internal thread is provided on a cavity wall of the accommodating cavity, the external thread is in threaded engagement with the internal thread, and an end face of the gear case 200 near the connection portion 1300 is fixedly connected with the connection portion 1300; meanwhile, a fixing screw is provided on an end surface of the connection part 1300 remote from the driving part 100, passes through the connection part 1300, and is screwed into the driving part 100, so that the connection part 1300 is detachably and fixedly connected with the driving part 100.

In the embodiment of the application, a limiting space is arranged on the cavity wall of the accommodating cavity around the circumference of the accommodating cavity, the limiting space extends from the end face of the gear box 200, which is close to the driving part 100, towards the interior of the accommodating cavity, the limiting space and the accommodating cavity are coaxially arranged, the diameter of the limiting space is larger than the groove diameter of the accommodating cavity, the internal thread is arranged on the inner wall of the limiting space, and the end face of the gear box 200, which is close to the connecting part 1300, is fixedly connected with the connecting part 1300 in an argon arc welding mode; by adopting the connection mode, the assembly difficulty of the gear box 200 and the driving part 100 is reduced, the assembly efficiency is improved, and the connection strength of the gear box 200 and the driving part 100 is enhanced. In addition, in order to strengthen the connection strength of the connection part 1300 and the driving part 100, four fixing screws are arranged, the four fixing screws are arranged at intervals around the circumference of the connection part 1300, and the arranged fixing screws enable the connection part 1300 to be detachably and fixedly connected with the driving part 100, so that the assembly difficulty and the manufacturing cost of the connection part 1300 and the driving part 100 are reduced. Of course, in other embodiments, the connection portion 1300 may also be fixedly mounted on the end surface of the driving portion 100 near the gear case 200 by welding.

Referring to fig. 7 and 8, as an alternative way in the embodiment of the present application, a shielding piece is disposed between the connection portion 1300 and the second carrying member 1230, the end surface of the shielding piece close to the connection portion 1300 is attached to the end surface of the connection portion 1300 far from the driving portion 100 so as to cover the fixing screw, the shielding piece is disposed in the limiting space, and the diameter of the shielding piece is greater than the groove diameter of the accommodating cavity and smaller than the diameter of the limiting space.

In summary, implementing the transmission device and the speed reducer with the transmission device provided by the embodiment has at least the following beneficial technical effects: the transmission piece 320 rotates around the axis of the accommodating cavity in the accommodating cavity under the action of the driving part 100, and under the cooperation of the transmission concave part and the transmission convex part, the transmission piece 320 drives the first sun gear 310 to rotate around the axis of the transmission piece in the accommodating cavity, and the first sun gear 310 is meshed with the first planet gear 330, and meanwhile, the first planet gear 330 is meshed with the cavity wall of the accommodating cavity, so that the first planet gear 330 can rotate around the axis of the first sun gear 310 and also can rotate around the axis of the transmission piece; in the process that the first sun gear 310 drives the first planet gear 330 to rotate, the first planet gear 330 applies torque to the first sun gear 310 to prevent the first sun gear 310 from rotating, but under the cooperation of the transmission concave part and the transmission convex part, the first sun gear 310 always and stably rotates along with the rotation of the transmission piece 320, so that the design avoids the rotation of the first sun gear 310 relative to the transmission piece 320, and ensures the stable operation of the transmission device.

The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application.

Claims (10)

1. The transmission device is characterized in that the transmission device is used for a speed reducer, the speed reducer comprises a driving part (100), the transmission device comprises a gear box (200) and a first transmission part (300), a containing cavity is formed in the gear box (200), an annular gear is arranged on the cavity wall of the containing cavity, and the first transmission part (300) is arranged in the containing cavity; the first transmission part (300) comprises first sun teeth (310) and a transmission piece (320) which are coaxially arranged, the transmission piece (320) is rotatably arranged in the accommodating cavity, the rotation axis of the transmission piece (320) coincides with the axis of the accommodating cavity, and the output end of the driving part (100) is in driving connection with the transmission piece (320);

the first sun gear (310) comprises a limiting section (311), a limiting groove is formed in the transmission piece (320), the limiting section (311) is arranged in the limiting groove in a penetrating mode, a first transmission structure is arranged on the groove wall of the limiting groove, a second transmission structure is arranged on the outer peripheral surface of the limiting section (311), one of the first transmission structure and the second transmission structure is a transmission concave portion, the other one of the first transmission structure and the second transmission structure is a transmission convex portion, and the transmission convex portion is arranged in the transmission concave portion in a penetrating mode so as to transmit power of the transmission piece (320) to the first sun gear (310);

The first sun gear (310) further comprises a transmission section (312) connected with the limiting section (311), the first transmission part (300) further comprises first planetary gears (330), and the first planetary gears (330) are arranged between the transmission section (312) and the cavity wall of the containing cavity, meshed with the transmission section (312) and meshed with the cavity wall of the containing cavity.

2. The transmission device according to claim 1, wherein the first transmission structure is a protruding strip (321), the second transmission structure is a groove (3111), the protruding strip (321) is inserted into the groove (3111), the protruding strip (321) is adapted to the groove (3111), the protruding strip (321) is the transmission protruding portion, and the groove (3111) is the transmission recessed portion.

3. The transmission according to claim 1, wherein the first transmission part (300) further comprises a first carrier (340), the first carrier (340) being arranged between the first planetary teeth (330) and the transmission (320); the first transmission part (300) further comprises a first connecting shaft (350) and a first rolling element (360), the first connecting shaft (350) and the first planetary gear (330) are coaxially arranged, the first end of the first connecting shaft (350) is fixedly arranged on the first carrying element (340), the first rolling element (360) is sleeved on the periphery of the first connecting shaft (350) and can roll around the periphery of the first connecting shaft (350), and the first planetary gear (330) is fixedly sleeved on the periphery of the first rolling element (360).

4. A transmission according to claim 3, characterized in that the transmission further comprises a mounting portion (400) and an output portion (500), the mounting portion (400) being arranged on a side of the gearbox (200) remote from the drive portion (100), the mounting portion (400) being provided with a mounting groove arranged in correspondence with and communicating with the receiving chamber; the output part (500) and the first sun gear (310) are coaxially arranged, the output part (500) is at least partially arranged in the mounting groove in a penetrating way, and can rotate around the axis of the first sun gear (310) in the mounting groove, the second end of the first connecting shaft (350) is fixedly connected with the output part (500) so as to drive the output part (500) to rotate around the axis of the first sun gear (310), and the output part (500) is the output end of the transmission device.

5. The transmission device according to claim 4, further comprising a connection bearing (600), wherein the connection bearing (600) is disposed between the output part (500) and the groove wall of the installation groove, an inner ring of the connection bearing (600) is fixedly sleeved on the outer circumferential surface of the output part (500), and an outer ring of the connection bearing (600) is fixedly connected with the groove wall of the installation groove.

6. The transmission device according to claim 4, wherein one end of the mounting portion (400) close to the gear case (200) is embedded in the accommodating cavity, and a connecting screw (1000) penetrating through the gear case (200) and screwed into the mounting portion (400) is arranged on the outer surface of the gear case (200) so as to detachably and fixedly connect the mounting portion (400) with the gear case (200); or alternatively, the first and second heat exchangers may be,

the output part (500) comprises an output body (510) and a limiting body (520), wherein the output body (510) is at least partially arranged in the mounting groove in a penetrating way, and can rotate in the mounting groove around the axis of the first sun gear (310), the limiting body (520) is arranged at one end, close to the gear box (200), of the output body (510), the limiting body (520) is arranged in the accommodating cavity, the second end of the first connecting shaft (350) is fixedly connected with the limiting body (520), and a projection surface, close to the end surface of the output body (510), of the limiting body (520) is projected onto a notch, close to the accommodating cavity, of the mounting groove at least partially covers the notch, close to the accommodating cavity, of the mounting groove; or alternatively, the first and second heat exchangers may be,

the first transmission part (300) is at least provided with two transmission parts along the extending direction of the accommodating cavity, the driving part (100) is in driving connection with the transmission parts (320) in the first transmission part (300) which are arranged close to the driving part (100) in the two first transmission parts (300), the second end of the first connecting shaft (350) in the first transmission part (300) is fixedly connected with the transmission parts (320) in the other first transmission part (300) so as to drive the transmission parts (320) to rotate, and the second end of the first connecting shaft (350) in the other first transmission part (300) is fixedly connected with the output part (500) so as to drive the output part (500) to rotate around the axis of the first sun gear (310); the transmission device further comprises a positioning part (1100), the positioning part (1100) and the accommodating cavity are coaxially arranged, and the positioning part (1100) sequentially penetrates through each first sun tooth (310), penetrates into the output part (500) and is fixedly connected with the output part (500).

7. The transmission according to any one of claims 4 to 6, further comprising a second transmission portion (1200), the second transmission portion (1200) being arranged within the receiving cavity and being located on a side of the first transmission portion (300) adjacent to the driving portion (100);

the second transmission part (1200) comprises a second sun gear (1210), a second planetary gear (1220), a second carrying piece (1230) and a second connecting shaft (1240), the second sun gear (1210) is coaxially arranged with the accommodating cavity and rotatably arranged in the accommodating cavity, the rotation axis of the second sun gear (1210) coincides with the axis of the accommodating cavity, the output end of the driving part (100) is in driving connection with the second sun gear (1210), and the second sun gear (1210) is the input end of the transmission device; the second planetary gear (1220) is arranged between the second sun gear (1210) and the cavity wall of the accommodating cavity, is meshed with the second sun gear (1210) and is meshed with the cavity wall of the accommodating cavity; the second carrying member (1230) is arranged on one side, far away from the transmission member (320), of the second planetary gear (1220), the first end of the second connecting shaft (1240) is fixedly arranged on the second carrying member (1230), the second planetary gear (1220) is sleeved on the periphery of the second connecting shaft (1240), and the second end of the second connecting shaft (1240) is fixedly connected with the transmission member (320) so as to drive the transmission member (320) to rotate.

8. The transmission device according to claim 7, wherein the second transmission part (1200) further comprises a second rolling element (1250), the second rolling element (1250) is sleeved on the outer periphery of the second connecting shaft (1240) and can roll around the circumference of the second connecting shaft (1240), and the second planetary gear (1220) is fixedly sleeved on the outer periphery of the second rolling element (1250).

9. A reducer, characterized in that it comprises a driving portion (100) and a transmission device according to any one of claims 7 to 8, said driving portion (100) being arranged on one side of said transmission device, an output end of said driving portion (100) being in driving connection with said second sun gear (1210) for driving said output portion (500) to rotate about an axis of said housing cavity.

10. The speed reducer according to claim 9, further comprising a connecting portion (1300), wherein the connecting portion (1300) is fixedly mounted on an end face of the driving portion (100) close to the gear case (200), an external thread is provided on an outer peripheral surface of the connecting portion (1300) along a circumferential direction of the connecting portion (1300), an internal thread is provided on a cavity wall of the accommodating cavity, the external thread is in threaded engagement with the internal thread, and an end face of the gear case (200) close to the connecting portion (1300) is fixedly connected with the connecting portion (1300).