CN214248261U - Gearbox and actuator - Google Patents

Abstract

The utility model discloses a gearbox and an actuator, wherein the gearbox comprises a base, a shell and a planetary transmission mechanism arranged on the base; the shell is provided with an accommodating cavity, an annular side plate for forming the side wall of the accommodating cavity and a bottom plate for forming the bottom wall of the accommodating cavity. The planetary transmission mechanism is accommodated in the accommodating cavity and comprises a planet carrier, a plurality of planetary gears, a rotating shaft and a sun gear meshed among the plurality of planetary gears; the planet gear is rotatably arranged on the planet carrier through a rotating shaft; and a gear ring is arranged on the inner side wall of the annular side plate. The planet carrier is provided with a mounting hole in clearance fit with the rotating shaft, one end of the rotating shaft, which is far away from the base, is provided with a butting part used for butting with the bottom plate, and the rotating shaft is also provided with a limiting part used for limiting the rotating shaft to move towards the direction of the base. The gearbox can effectively solve the problem that the rotating shaft axially moves due to the planetary gear and cannot reset, and avoids the damage of the rotating shaft to the shell after the rotating shaft protrudes out of the planet carrier, so that the stability in the use process is enhanced.

Description

Gearbox and actuator

Technical Field

The utility model relates to a gearbox technical field, especially a gearbox and executor.

Background

A planetary gear speed variator is composed of gear ring, sun gear, planetary gears and axle, and features that according to the movement of gear ring, sun gear and planetary gears, the input and output shafts can be separated from rigid drive, the input and output shafts can be driven in same or opposite directions, and the drive ratio between input and output shafts can be changed.

In the prior art, the planetary gear is generally rotatably mounted on the rotating shaft through a bearing, and then both ends of the rotating shaft are respectively fixed on the planetary carrier. Specifically, in the prior art, the planet carrier is provided with mounting holes which are arranged opposite to two ends of the rotating shaft and are in interference fit with the two ends of the rotating shaft respectively. Because planetary gear can produce the ascending power of scurrying of axial direction at the rotation in-process, this drunkenness can drive the pivot and drunkenness along axial direction, because pivot and mounting hole interference fit, consequently, in case the pivot will cause the pivot to stretch out the planet carrier and hardly realize restoring to the throne after the pivot runs through the direction drunkenness along the mounting hole. After the rotating shaft protrudes out of the planet carrier and can not be reset, the rotating shaft can be abutted against a bottom plate of the shell, the shell is easily damaged along with the continuous outward protrusion of the rotating shaft, and meanwhile, the instability of the rotating process of the planet gear can also be caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a gearbox to solve not enough among the prior art, it can effectually solve the pivot axial float's that planetary gear caused non-resettable problem, avoided the pivot to the damage of casing and strengthened planetary gear's stability in the use after the planet carrier suddenly stretches out.

The utility model provides a gearbox, which comprises a base, a shell matched with the base and a planetary transmission mechanism arranged on the base; the shell is provided with an accommodating cavity with an opening towards the direction of the base, an annular side plate forming the side wall of the accommodating cavity and a bottom plate forming the bottom wall of the accommodating cavity;

the planetary transmission mechanism is accommodated in the accommodating cavity and comprises a planet carrier, a plurality of planetary gears, a rotating shaft and a sun gear meshed among the plurality of planetary gears; the planetary gear is rotatably arranged on the planet carrier through the rotating shaft; a gear ring meshed with the planetary gear is arranged on the inner side wall of the annular side plate;

the planet carrier is provided with a mounting hole in clearance fit with the rotating shaft, one end of the base, far away from the rotating shaft, is provided with a butting part used for butting with the bottom plate, and the rotating shaft is further provided with a limiting part used for limiting the rotating shaft to the shifting of the base in the direction.

Further, the planet carrier comprises a first mounting plate, a second mounting plate and a connecting frame for connecting the first mounting plate and the second mounting plate; the planetary gear is rotatably arranged between the first mounting plate and the second mounting plate;

the first mounting plate and the second mounting plate are both provided with the mounting holes; the limiting part is arranged on the rotating shaft and is abutted against the first mounting plate and/or the second mounting plate.

Further, the rotating shaft is provided with a first shaft body and a second shaft body which are coaxially arranged, and the size of the cross section of the first shaft body is smaller than that of the cross section of the second shaft body; one end of part of the second shaft body, which is connected with the first shaft body, forms the limiting part; the limiting part is abutted against one side, deviating from the base direction, of the first mounting plate or abutted against one side, deviating from the base direction, of the second mounting plate.

Further, the mounting hole on the first mounting panel deviates from for the opening orientation the blind hole of base, spacing portion is located be close to in the pivot the one end of base, and spacing portion butt is in the blind hole of first mounting panel.

Further, the first shaft body and the second shaft body are integrally formed.

Further, the first mounting plate, the second mounting plate and the connecting frame are integrally formed.

Furthermore, a positioning ring is arranged on the outer side wall of the rotating shaft, and the limiting part is arranged on one side, close to the base, of the positioning ring.

Further, the surface roughness of the annular protrusion is smaller than the surface roughness of the plate body.

An actuator comprises the gearbox and the motor, and an output shaft of the motor drives the sun gear to rotate.

Compared with the prior art, the embodiment of the utility model provides a set the pivot to with the mounting hole clearance fit on the planet carrier, consequently at the axial float power that the planetary gear rotation in-process produced cancel the automatic re-setting that the back pivot can also relax to the effectual pivot axial float's that has solved the planetary gear and caused the non-resettable problem, avoided the pivot to the damage of casing and strengthened the stability of planetary gear in the use after the planet carrier suddenly stretches out.

Drawings

Fig. 1 is a perspective view of an actuator disclosed in an embodiment of the present invention;

FIG. 2 is a schematic diagram of a first construction of a transmission according to an embodiment of the present invention;

FIG. 3 is a second schematic diagram of a transmission according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a third construction of a transmission according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a casing in the transmission disclosed in the embodiment of the present invention;

fig. 6 is a schematic structural diagram of a transmission case according to an embodiment of the present invention after a cover plate is removed from a case body;

fig. 7 is a schematic structural diagram of a planetary transmission mechanism in the transmission disclosed by the embodiment of the invention;

FIG. 8 is an exploded view of FIG. 7;

fig. 9 is a schematic view of a first structure of a transmission according to an embodiment of the present invention, in which a planetary gear is installed behind a planetary carrier;

FIG. 10 is a second schematic diagram of a transmission according to an embodiment of the present invention, wherein the planetary gear is mounted on the carrier;

fig. 11 is a schematic structural diagram of a planet carrier in the transmission disclosed by the embodiment of the invention;

fig. 12 is a schematic structural view of a rotating shaft in a transmission disclosed in an embodiment of the present invention;

fig. 13 is a schematic structural view of a primary planetary gear and a primary planet carrier, which are disclosed in the embodiment of the present invention, after being mounted and fixed;

description of reference numerals: 1-a base, 11-a positioning protrusion,

2-shell, 20-containing cavity, 21-annular side plate, 211-positioning groove, 22-top plate, 220-output end through hole, 221-rotation limiting platform, 222-plate body, 223-annular protrusion, 224-axial clamping groove, 23-clamping piece, 231-clamping groove, 232-rotation limiting hole, 233-elastic clamping foot, 24-fastening piece, 25-rotation limiting groove,

3-a gear ring, 4-a planet gear, 5-an output end, 51-an internal spline, 6-a planet carrier, 60-a mounting hole, 61-a first mounting plate, 610-a central through hole, 62-a second mounting plate, 63-a connecting frame, 7-a rotating shaft, 71-an abutting part, 72-a limiting part, 73-a first rotating shaft, 74-a second rotating shaft, 8-a sun gear,

100-motor, 101-first-stage planet carrier, 102-first-stage planet gear, 103-first-stage rotating shaft and 104-first-stage sun gear.

Detailed Description

The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

The embodiment of the utility model provides a: as shown in fig. 1-13, a gearbox is disclosed, comprising a base 1, a housing 2 cooperating with said base 1 and a planetary transmission; the housing 2 has a housing cavity 20 opened toward the base 1, and the planetary transmission mechanism is housed in the housing cavity 20.

As shown in fig. 2 to 6, the housing 2 specifically includes a ring-shaped side plate 21 forming a side wall of the housing cavity 20 and a top plate 22 forming a bottom wall of the housing cavity 20. Annular curb plate 21 is connected fixedly with base 1, and annular curb plate 21 cover is established the outside of base 1 to fix through a plurality of fasteners 24 on the lateral wall of base 1, specifically, fastener 24 can be screw or bolt of threaded connection on base 1, and fastener 24 wears to establish casing 2. In order to improve the mounting stability of the housing 2 and the base 1, a positioning groove 211 with an opening facing away from the top plate 22 is provided on one side of the annular side plate 21 away from the top plate 22. Correspondingly, a positioning protrusion 11 matched with the positioning groove 211 is arranged on the base 1, and the positioning of the shell 2 and the base 1 is realized through the matching of the positioning protrusion 11 and the positioning groove 211. Specifically, the positioning protrusion 11 and the positioning groove 211 may be configured to be in an interference fit.

In the prior art, the base 1 and the housing 2 are generally connected and fixed only by using a screw or a bolt fastener 24, in the rotating process of the planetary transmission mechanism, because the planetary gear 6 in the planetary transmission mechanism can be meshed and rotated with the gear ring 3 arranged on the inner side wall of the annular side plate 21, in the rotating process of the planetary transmission mechanism, acting force acts on the housing 2 to enable the housing 2 and the base 1 to rotate relatively, and the acting force applied to the housing 2 by the planetary transmission mechanism is transmitted to the bolt or the screw connecting the base 1 and the housing 2 through the housing 2, so that the connection of the bolt or the screw is loosened, and the housing 2 and the base 1 fall off. In the present embodiment, the positioning groove 211 and the positioning protrusion 11 are matched to limit the circumferential rotation of the housing 2, so that when the acting force generated in the rotation process of the planetary gear train acts on the housing 2, the acting force is blocked by the positioning protrusion 11, thereby preventing the acting force from acting on the bolt or the screw, and further stabilizing the connection and fixation of the housing 2 and the base 1.

The shell 2 and the base 1 are finally fixedly connected through a fastener. Specifically, a first threaded hole is formed in the annular side plate 21 of the shell 2, a second threaded hole matched with the first threaded hole is formed in the base 1, and one end of a bolt or a screw penetrates through the first threaded hole and is finally fixed to the second threaded hole. In this embodiment, in order to more stably realize the connection and fixation between the casing 2 and the base 1, the casing 2 and the base 1 are connected and fixed by a plurality of fastening members 24, and the plurality of fastening members 24 are annularly arranged on the outer side wall of the annular side plate 21 and are annularly mounted and fixed on the base 1.

As shown in fig. 5, the inner side wall of the annular side plate 21 is further provided with ring gears 3 arranged in an annular shape, and the ring gears 3 are disposed in the cavity of the accommodating cavity 20 and are used for meshing with planetary gears 4 disposed on a planetary transmission mechanism accommodated in the accommodating cavity 20.

Further, in the process of molding the gear ring 3 on the inner side of the housing 2, in order to avoid the rotation of the housing 2 in the mold structure, a rotation limiting groove 25 is further provided on the outer side wall of the housing 2. The arrangement of the rotary limiting groove 25 can limit the shell 2 to rotate in the die structure, and products are prevented from rotating along with the tooth-shaped mechanism of the gear ring 3 in the shell 2.

An output end through hole 220 communicated with the accommodating cavity 20 is formed in the top plate 22 of the housing 2, the output end 5 of the planetary transmission mechanism finally penetrates through the accommodating cavity 20 through the output end through hole 220, the output end 5 of the planetary transmission mechanism is externally connected with a driven mechanism, and the driven mechanism is used for receiving the output torque of the gearbox to generate rotating force. The output 5 of the planetary transmission can be connected and fixed with the input shaft of the driven mechanism through spline fit, so that the output 5 can be provided with an internal spline 51 or an external spline. The spline fit structure arranged between the output end 5 and the input shaft of the driven mechanism is only used for transmitting torsional force, and the driven mechanism and the gearbox cannot be connected and fixed in the axial direction.

As shown in fig. 6, in order to conveniently achieve the axial connection and fixation of the transmission and the driven mechanism, in this embodiment, a clamping member 23 for connecting and fixing the transmission and the driven mechanism is provided on an outer side wall of the top plate 22, and the clamping member 23 is detachably mounted and fixed on the top plate 22. The clamping piece 23 is provided with a plurality of clamping grooves 231 used for being fixedly connected with a driven mechanism, and the clamping grooves 231 are arranged in a plurality of annular shapes on the clamping piece 23. The plurality of engaging grooves 231 are annularly arranged with the output end through hole 220 as a center. Correspondingly, be provided with the joint foot with joint groove 231 looks adaptation on being driven mechanism, realize being fixed on casing 2 by the drive mechanism installation through the cooperation of joint groove and joint foot.

In this embodiment, in order to facilitate the installation and fixation of the clip 23, a plurality of rotation limiting tables 221 extending away from the annular side plate 21 are disposed on the top plate 22, a rotation limiting hole 232 adapted to the rotation limiting tables 221 is disposed on the clip 23, and the clip 23 is limited to rotate in the circumferential direction by the cooperation of the rotation limiting hole 232 and the rotation limiting tables 221.

In order to fix the clamping member and the housing 2 in the axial direction, an axial clamping groove 224 is formed in the side wall of the rotation limiting table 221, and an elastic clamping pin 233 adapted to the axial clamping groove 224 is arranged on the clamping member 23. The detachable installation and fixation of the clamping piece 23 and the shell 2 are realized through the matching of the elastic clamping foot 233 and the rotation limiting table 221. The rotation limiting table 221 is provided with a plurality of in this embodiment, and the rotation limiting table 221 surrounds the output end through hole 220 is annularly arranged, and the installation of the realization clamping piece 23 that the rotation limiting table 221 can be more stable is fixed.

As shown in fig. 7 to 11, the planetary gear mechanism includes a carrier 6, a plurality of planetary gears 4, a rotating shaft 7, and a sun gear 8 engaged between the plurality of planetary gears 4; the planetary gear 4 is rotatably mounted on the planet carrier 6 through the rotating shaft 7. The output end 5 is arranged on the planet carrier 6. The sun gear 8 is used for being connected and fixed with the motor, the plurality of planetary gears 4 are installed on the planet carrier 6 in an annular rotating mode, the sun gear 8 is located at the center position of the planetary gears 4 which are arranged in an annular mode and meshed with each planetary gear 4, and meanwhile the planetary gears 4 are also meshed with the gear ring 3. Therefore, in the process that the motor drives the sun gear 8 to rotate, the sun gear 8 rotates the planet gear 4, so that the planet gear 4 rotates relative to the gear ring 3 to drive the planet carrier 6 to rotate, and the driving force of the motor is transmitted to the output end 5 of the planet carrier 6. In this embodiment, the planetary gear 4 is a helical gear, and the ring gear 3 is a helical gear that is matched with the planetary gear 4, so that the helical gear can realize more stable transmission.

As shown in fig. 11, in particular, the planet carrier 6 includes a first mounting plate 61, a second mounting plate 62, and a connecting frame 63 connecting the first mounting plate 61 and the second mounting plate 62. First mounting panel 61 and second mounting panel 62 parallel arrangement, link 63 is provided with a plurality ofly and is the annular setting, and the both ends of link 63 are connected fixedly with first mounting panel 61 and second mounting panel 62 respectively. The first mounting plate 61 is disposed closer to the motor 100 than the second mounting plate 62, a center through hole 610 for the sun gear 8 to pass through is provided on the first mounting plate 61, and the output terminal 5 is disposed on the second mounting plate 62.

The connecting carriers 63 arranged in a ring shape are provided at intervals, and the interval formed between two adjacent connecting carriers 63 is used for mounting the planetary gears 4. In the present embodiment, in order to improve the stability of the entire carrier 6, the first mounting plate 61, the second mounting plate 62 and the connecting frame 63 are integrally formed. In another embodiment, in order to facilitate mold-opening molding, the planet carrier may be formed as a separate body, and specifically, the first mounting plate 61 and the connecting frame 63 are integrally formed and then fixedly connected to the second mounting plate 62 of the separate body.

The planetary gear 4 is rotatably mounted between a first mounting plate 61 and a second mounting plate 62. In the prior art, the planetary gear 4 is rotatably mounted on the rotating shaft 7 through a bearing, and then both ends of the rotating shaft 7 are fixed on the first mounting plate 61 and the second mounting plate 62, respectively. In the prior art, the first mounting plate 61 and the second mounting plate 62 are both provided with mounting holes 60, and both ends of the rotating shaft 7 are in interference fit with the corresponding mounting holes 60 respectively. In the prior art, the planetary gear 4 can generate a shifting force in the axial direction during the rotation process, the shifting force can drive the rotating shaft 7 to shift along the axial direction, and the rotating shaft 7 is in interference fit with the mounting hole 60, so that once the rotating shaft 7 shifts along the penetrating direction of the mounting hole 60, the rotating shaft 7 protrudes out of the planet carrier 6 and the reset is difficult to realize. The rotating shaft 7 protrudes out of the planet carrier 6 and then abuts against the top plate of the housing 2, and the housing 2 is easily damaged along with the outward protrusion of the rotating shaft 7.

The play of the planetary gear 4 during rotation is inevitable, and in order to solve the above problem, in the present embodiment, the rotating shaft 7 and the mounting hole 60 are arranged to be in clearance fit, the clearance fit is arranged so that the rotating shaft 7 can move up and down in the axial direction in the mounting hole 60, and the installation of the rotating shaft 7 on the planet carrier 6 can be conveniently realized due to the clearance fit arranged between the rotating shaft 7 and the mounting hole 60. Of course, the rotating shaft 7 must move within a certain range in a small range, and therefore, a limiting structure for preventing the rotating shaft 7 from moving excessively is arranged in both axial directions of the rotating shaft. Specifically, an abutting portion 71 for abutting against the top plate 22 of the housing 2 is provided at an end of the rotating shaft 7 away from the base 1, and a limiting portion 72 for limiting the movement of the rotating shaft 7 in the direction of the base 1 is further provided on the rotating shaft 7. The abutment portion 71 abuts against the top plate 22 to limit the rotation shaft 7 in a direction away from the base 1 on the rotation shaft 7, and the limit portion 72 limits the rotation shaft 7 in a direction close to the base 1 on the rotation shaft. The abutment portion 71 and the stopper portion 72 cooperate to limit the rotation shaft 7 in two directions in the axial direction, and allow the rotation shaft 7 to move up and down within a certain range. Because the rotating shaft 7 is in clearance fit with the mounting hole in the planet carrier 6, the rotating shaft 7 can be reset easily and automatically after the axial float force generated in the rotation process of the planetary gear 4 is cancelled, so that the problem that the rotating shaft 7 cannot reset due to axial float caused by the planetary gear 4 is solved effectively, and deformation and abrasion caused by the planetary gear 4 in the long-time use process are avoided.

In the present embodiment, the abutting portion 71 is configured to abut against the planet carrier 6, specifically, the abutting portion 71 may be configured to abut against the first mounting plate 61, or the abutting portion 71 may be configured to abut against the second mounting plate 62, or two abutting portions 71 may be configured to abut against the first mounting plate 61 and the second mounting plate 62 at the same time.

As shown in fig. 12, in the present embodiment, the rotating shaft 7 has a first shaft body 73 and a second shaft body 74 which are coaxially arranged, and the size of the cross section of the first shaft body 73 is smaller than that of the cross section of the second shaft body 74, the first shaft body 73 and the second shaft body 74 both have a cylindrical structure, the diameter of the cross section circle of the first shaft body 73 is smaller than that of the cross section circle of the second shaft body 74, and the first shaft body 73 and the second shaft body 74 are coaxially arranged. The first shaft 73 is integrally formed with the second shaft 74, and the first shaft 73 actually protrudes from one end of the second shaft 74.

Due to the difference in cross-sectional dimension between the first shaft body 73 and the second shaft body 74, a step is formed at the junction between the first shaft body 73 and the second shaft body 74, and the stopper portion 73 is formed on a shoulder portion of the step. The limiting portion 72 is formed at one end of a part of the second shaft 74 connected with the first shaft 73. The stopper portion 72 is provided at one end of the second shaft body 74, and the end of the stopper portion 72 is the end of the second shaft body 74 connected to the first shaft body 73. The limiting portion 72 abuts against one side of the first mounting plate 61 departing from the direction of the base 1 or the limiting portion 72 abuts against one side of the second mounting plate 62 departing from the direction of the base 1.

In another embodiment, a positioning ring is disposed on the outer side wall of the rotating shaft 7, and the limiting portion 72 is disposed on a side of the positioning ring close to the base 1. The positioning ring is abutted against one side of the first mounting plate 61 departing from the direction of the base 1 or the positioning ring is abutted against one side of the second mounting plate 62 departing from the direction of the base 1.

Of course, in another embodiment, the mounting hole 60 on the first mounting plate 61 is a blind hole with an opening facing away from the base 1, the position-limiting portion 72 is located at one end of the rotating shaft 7 close to the base 1, and the position-limiting portion 72 abuts against the blind hole of the first mounting plate 61. In the present embodiment, one end of the rotating shaft 7 directly abuts on the first mounting plate 61.

The rotating shaft 7 abuts against the top plate 22 of the housing 2 when receiving an axially acting force during rotation of the carrier 6, and the top plate 22 is provided with a plate body 222 and an annular projection 223 projecting inward from the plate body 222 and abutting against the abutting portion 71. The annular projection 223 is annularly provided and the annular projection 223 coincides with the movement locus of the abutment portion 71 of the rotating shaft 7 during rotation. The planet carrier 6 will also have a tendency to move after being acted by force during rotation, and the arrangement of the annular projection 223 can reduce the contact area of the planet carrier 6 and the top plate 22, so that the friction resistance during rotation is smaller. More preferably, the surface roughness of the annular protrusion 223 is smaller than the surface roughness of the plate body 222. The annular projection 223 is provided with a smoother surface so that the frictional resistance during rotation is smaller.

The above description of the embodiment has been given of a transmission having a primary planetary gear transmission, but the structure of the above embodiment can be applied to a transmission having a secondary planetary gear transmission. Specifically, the gearbox with the secondary planetary transmission comprises a primary planetary transmission unit and a secondary planetary transmission unit, wherein the primary planetary transmission unit is fixedly connected with the motor, the primary planetary transmission unit drives the secondary planetary transmission unit, and the output end of the secondary planetary transmission unit drives the driven mechanism. The secondary planetary transmission unit comprises a planet carrier 6, a plurality of planetary gears 4, a rotating shaft 7 and a sun gear 8 meshed among the plurality of planetary gears 4; the planetary gear 4 is rotatably mounted on the planet carrier 6 through the rotating shaft 7.

As shown in fig. 8 and 13, the primary planetary gear unit includes a primary planet carrier 101, a plurality of primary planetary gears 102, a primary rotation shaft 103, and a primary sun gear 104 engaged between the plurality of primary planetary gears 102; the primary planet gear 104 is rotatably mounted on the primary planet carrier 101 through the primary rotating shaft 103. The primary planetary gears 104 mesh with the ring gear 3 on the housing 2. The primary sun gear 104 is used for being fixedly connected with a motor shaft of the motor 100, and the sun gear 8 of the secondary planetary transmission unit is fixed on the primary planet carrier 101. Motor 100 drives one-level sun gear 104 and rotates, one-level sun gear 104 drives one-level planetary gear 102 and rotates simultaneously all one-level planetary gear 102 and ring gear 3 meshing drive one-level planet carrier 101 and rotate around one-level pivot 103, one-level planet carrier 101 rotates and drives sun gear 8 and rotate, sun gear 8 drives planetary gear 4 and rotates around pivot 7, planetary gear 4 and ring gear 3 mesh simultaneously, planetary gear 4's rotation can drive planet carrier 6 and rotate, planet carrier 6 passes through output 5 transmission to by actuating mechanism with rotatory power in the rotation process.

For transmissions with two-stage planetary transmission, the rotary shaft 7 of the two-stage planetary transmission unit is merely arranged with one end abutting against the housing 2. And the primary rotating shaft 103 on the primary planetary transmission unit is arranged to abut against the planet carrier 6 of the secondary planetary transmission belt unit or the primary rotating shaft 103 is arranged to be in interference fit with the mounting hole on the primary planet carrier 101 to realize fixed mounting.

The utility model discloses a further embodiment discloses an executor, including foretell gearbox and motor 100 the output shaft drive of motor 100 sun gear 8 rotates.

The utility model discloses another embodiment still discloses a device, including gearbox, motor 100 and driven piece, the gearbox is as above-mentioned gearbox, be provided with output 5 on the planet carrier 6, be provided with on the driven piece with the input of 5 looks adaptations of output, just the driven piece joint is in the joint groove 231 of joint spare 23.

The structure, features and effects of the present invention have been described in detail above according to the embodiment shown in the drawings, and the above description is only the preferred embodiment of the present invention, but the present invention is not limited to the implementation scope shown in the drawings, and all changes made according to the idea of the present invention or equivalent embodiments modified to the same changes should be considered within the protection scope of the present invention when not exceeding the spirit covered by the description and drawings.

Claims (10)

1. A gearbox comprises a base, a shell matched with the base and a planetary transmission mechanism arranged on the base; the shell is provided with an accommodating cavity with an opening towards the direction of the base, an annular side plate forming the side wall of the accommodating cavity and a bottom plate forming the bottom wall of the accommodating cavity;

the planetary transmission mechanism is accommodated in the accommodating cavity and comprises a planet carrier, a plurality of planetary gears, a rotating shaft and a sun gear meshed among the plurality of planetary gears; the planetary gear is rotatably arranged on the planet carrier through the rotating shaft; a gear ring meshed with the planetary gear is arranged on the inner side wall of the annular side plate;

the planet carrier is characterized in that the planet carrier is provided with a mounting hole in clearance fit with the rotating shaft, one end of the rotating shaft, which is far away from the base, is provided with a butting part used for butting with the bottom plate, and the rotating shaft is also provided with a limiting part used for limiting the rotating shaft to move towards the base.

2. The transmission of claim 1, wherein the planet carrier comprises a first mounting plate, a second mounting plate, and a connecting cage connecting the first and second mounting plates; the planetary gear is rotatably arranged between the first mounting plate and the second mounting plate;

the first mounting plate and the second mounting plate are both provided with the mounting holes; the limiting part is arranged on the rotating shaft and is abutted against the first mounting plate and/or the second mounting plate.

3. The gearbox of claim 2, wherein the rotating shaft is provided with a first shaft body and a second shaft body which are coaxially arranged, and the size of the cross section of the first shaft body is smaller than that of the cross section of the second shaft body; one end of part of the second shaft body, which is connected with the first shaft body, forms the limiting part; the limiting part is abutted against one side, deviating from the base direction, of the first mounting plate or abutted against one side, deviating from the base direction, of the second mounting plate.

4. The gearbox of claim 2, wherein the mounting hole of the first mounting plate is a blind hole with an opening facing away from the base, the limiting portion is located at one end of the rotating shaft close to the base, and the limiting portion abuts against the blind hole of the first mounting plate.

5. A gearbox according to claim 3, characterised in that the first shaft body is integrally formed with the second shaft body.

6. The transmission of claim 2, wherein the first mounting plate, the second mounting plate, and the connecting bracket are integrally formed.

7. The gearbox of claim 2, wherein a positioning ring is disposed on an outer side wall of the rotating shaft, and the limiting portion is disposed on a side of the positioning ring close to the base.

8. A gearbox according to claim 1 wherein said base plate is provided with a plate body and an annular projection projecting inwardly from the plate body for abutment with said abutment.

9. The transmission of claim 8, wherein the annular protrusion has a surface roughness less than a surface roughness of the plate body.

10. An actuator comprising a gearbox according to any of claims 1 to 9 and an electric motor, the output shaft of which drives the sun gear in rotation.

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