CN219221170U - Combined planetary gear reducer and automobile seat using same - Google Patents

Abstract

The utility model discloses a combined planetary gear reducer and an automobile seat using the same, and belongs to the technical field of automobile automatic seats.

Description

Combined planetary gear reducer and automobile seat using same

Technical Field

The utility model relates to the technical field of automatic seats of automobiles, in particular to a combined planetary gear reducer and an automobile seat using the same.

Background

The automobile industry develops rapidly, the riding comfort of the automobile is also better, the seat function is diversified, the degree of automation is also higher, the height and the position of the seat are not required to be manually adjusted, the motor under the control of the automobile machine system is automatically operated, the backrest of the seat is smaller in the residual space on the premise of ensuring the comfort of passengers, and the whole overturning of the backrest of the seat needs enough torque to be pushed, so that the requirement on the volume and the output capacity of the driving device is very high.

The prior patent application with publication number of CN213109089U discloses a high-torque lifting driver based on a duplex planetary gear system, which comprises a motor, a primary transmission mechanism, a planetary gear transmission mechanism and an output gear, wherein the primary transmission mechanism, the planetary gear transmission mechanism and the output gear are arranged in a gear box; the planetary gear transmission mechanism is used as a secondary transmission mechanism and comprises at least one planetary gear, the planetary gear is arranged on the planet carrier through a planetary shaft, the planetary gear is internally meshed with the inner gear ring and externally meshed with the sun gear, and the sun gear is arranged on the central shaft; the planetary gear is a duplex gear, the pinion of the planetary gear is internally meshed with the annular gear, the bull gear of the planetary gear is externally meshed with the sun gear, the output torque of the driver is limited, a plurality of seats can not be turned over simultaneously, the form of the output shaft of the driver is not matched with the seats with different specifications for driving and use, and the manufacturing difficulty and cost of the seats are improved.

Disclosure of Invention

The utility model aims to provide a combined planetary gear reducer, which solves the problems that the output torque of pushing a plurality of seat backs simultaneously is insufficient and the seats with different specifications cannot be matched in a different way for automatic overturning and use.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

the utility model provides a combination formula planetary gear reducer, includes reduction gear body and drive arrangement, drive arrangement with the reduction gear body links to each other, the reduction gear body includes casing, first reduction gear, first order planetary reduction mechanism, second order planetary reduction mechanism, ring gear and end cover, the end cover is connected on the one end of casing, first reduction gear rotates to be connected in the casing, first order planetary reduction mechanism with second order planetary reduction mechanism follows the axis of first reduction gear arranges in proper order, the ring gear sets up on the inner wall of casing, just first order planetary reduction mechanism with second order planetary reduction mechanism respectively with the ring gear meshes, first reduction gear first order planetary reduction mechanism with second order planetary reduction mechanism is hollow, through drive arrangement and multistage planetary reduction mechanism reduce speed, improved the moment of torsion output upper limit of this combination formula planetary reduction gear, through selecting different drive arrangement still can possess self-locking ability.

The second-stage planetary reduction mechanism comprises a second planetary disc, a plurality of second planetary shafts, a hollow cup shaft, an axle center frame and a plurality of second planetary gears, wherein the hollow cup shaft is rotationally connected with the end cover, the hollow cup shaft is arranged on the second planetary disc, the second planetary shafts wind the axle centers of the second planetary discs, the second planetary gears are sleeved on the second planetary shafts in a one-to-one correspondence manner, the axle center frame is coaxially connected with the second planetary discs, the bearing capacity and the upper limit of output torque of the speed reducer body can be improved, the structure is compact, and the occupied installation space is small.

The first-stage planetary reduction mechanism comprises a first planetary disc, a plurality of first planetary shafts, a plurality of first planetary gears and a first sun gear, wherein the first planetary gears are arranged on the first planetary disc, the plurality of first planetary shafts are distributed around the center of the first planetary disc, the plurality of first planetary gears are sleeved on the plurality of first planetary shafts in a one-to-one correspondence manner, the first planetary disc and the first sun gear are hollow, the first planetary disc is rotationally connected on the axle center frame, the first-stage planetary reduction mechanism can limit different torques and installation occasions by superposing a plurality of first-stage planetary reduction mechanisms, and the speed reducer body with different stages is used, so that the installation cost and the manufacturing cost are low.

The second-stage planetary reduction mechanism further comprises a centering gasket, and the centering gasket is sleeved on the axle center frame and used for improving the stability of the output of the driving device.

The driving device comprises a motor and a second reduction gear, the motor is arranged on one side wall of the shell, the second reduction gear is arranged on an output shaft of the motor, the second reduction gear is meshed with the first reduction gear, a first-stage reduction mechanism is added, and the output capacity of the speed reducer body can be improved.

The second reduction gear is a worm gear, the first reduction gear is a duplex gear, and the capacity is improved and the structural volume is reduced.

The end cover comprises an end cover bearing and a buckle plate, wherein the end cover bearing is arranged on the end cover, the buckle plate is arranged on the edge of the end cover and extends along the axial direction of the end cover, and the stability of the output of the speed reducer body is improved.

The inner wall of the shell is provided with a groove, the outer wall of the inner gear ring is provided with a bulge, and the bulge is matched with the groove to prevent the reducer body from shaking in the output process.

The planetary reduction gear further comprises a plurality of first-stage planetary reduction mechanisms, the plurality of first-stage planetary reduction mechanisms are sequentially arranged along the axis of the first reduction gear, and the output range of the reducer body is enlarged.

The second purpose of the utility model is to provide an automobile seat, which solves the problems that a plurality of seats cannot be automatically pushed to turn over in a narrow space of an automobile and the manufacturing cost of a driver is high.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

the utility model provides an automobile seat, includes combination formula planetary gear reducer, pivot, bracket and back, the pivot with combination formula planetary gear reducer registrates, and with back fixed connection, combination formula planetary gear reducer detachably connects on the bracket, through the bracket with the pivot can with combination planetary gear reducer is used for the seat drive of different specifications and different quantity to use, and simple to operate practices thrift automobile seat's manufacturing cost.

The beneficial effects of the utility model are as follows:

(1) The combined planetary gear reducer is provided with the driving device and the reducer body, worm and gear transmission is adopted between the driving device and the reducer body so as to improve output torque, the reducer body is internally provided with a first-stage planetary reduction mechanism and a second-stage planetary reduction mechanism, the output torque of the reducer is further improved through the two-stage planetary reduction mechanism, the reducer can push a plurality of seats to rotate simultaneously, the first-stage planetary reduction mechanism and the second-stage planetary reduction mechanism are coaxially arranged and meshed with the same annular gear, the reducer body is compact in structure, small in occupied space and high in output torque, the first-stage planetary reduction mechanism and the second-stage planetary reduction mechanism are hollow, and can be installed on seats of different specifications through solid rotating shafts to be used as driving devices through shells, so that the cost of producing automobile seats is reduced.

(2) The second planetary reduction mechanism on the combined planetary gear reducer comprises a plurality of second planetary gears, a hollow cup shaft and an axle center frame, wherein the first planetary reduction mechanism can be sleeved on the axle center frame to rotate, the hollow cup shaft can be rotationally connected to the end cover, one end of the axle center frame extends out of the shell, the hollow cup shaft and the axle center frame are supported by a bearing, so that the first planetary reduction mechanism and the first planetary reduction mechanism are stably and reliably driven, the solid shaft is matched with the hollow cup shaft to be installed, the application range of the combined planetary gear reducer is enlarged, and a plurality of first planetary reduction mechanisms can be sleeved on the axle center frame along the axis of the solid shaft to improve the output torque, so that the combined planetary gear reducer is convenient to use aiming at different loads, the manufacturing difficulty of an automobile seat is reduced, and materials are saved.

(3) The automobile seat comprises a rotating shaft, a bracket and a combined type planetary gear reducer, wherein the combined type planetary gear reducer is detachably connected to the bracket, the rotating shaft is clamped in a hollow cup shaft of the combined type planetary gear reducer, the bracket is fixed below the seat, the installation of the combined type planetary gear reducer is convenient, the seat is connected through the replacement of different rotating shafts, the planetary gear reducer can drive one or a plurality of seats to overturn simultaneously, the driving capability is strong, the use of the seats with different specifications and numbers is met, and the manufacturing cost of the seat is reduced.

Drawings

FIG. 1 is an isometric view of a compound planetary gear reducer provided by the present utility model;

FIG. 2 is a partially exploded view of a compound planetary gear reducer provided by the present utility model;

FIG. 3 is a fully exploded view of the compound planetary gear reducer provided by the present utility model;

FIG. 4 is an exploded view of the reducer body provided by the present utility model;

FIG. 5 is a block diagram of a housing provided by the present utility model;

FIG. 6 is an isometric view of a second stage planetary reduction mechanism provided by the present utility model;

FIG. 7 is an exploded view of the second stage planetary reduction mechanism provided by the present utility model;

FIG. 8 is an exploded view of the first stage planetary reduction mechanism provided by the present utility model;

FIG. 9 is an isometric view of a first reduction gear provided by the present utility model;

fig. 10 is a structural view of the ring gear provided by the present utility model;

FIG. 11 is an exploded view of an end cap provided by the present utility model;

fig. 12 is a schematic structural diagram of the second embodiment.

Reference numerals:

1. a combination planetary gear reducer; 11. a speed reducer body; 111. a housing; 1111. a stepped hole; 1112. a groove; 1113. a platform; 112. a motor bearing; 113. a top gap nut; 114. a first reduction gear; 1141. a first outer ring gear; 1142. a second outer ring gear; 115. a first-stage planetary reduction mechanism; 1151. a first planetary disc; 1152. a first planet axle; 1153. a first planetary gear; 1154. a first sun gear; 116. a second-stage planetary reduction mechanism; 1161. a second planetary disc; 1162. a second planetary shaft; 1163. a hollow cup shaft; 1164. an axle center frame; 1165. a second planetary gear; 1166. aligning gaskets; 117. an inner gear ring; 1171. a toothed ring; 1172. internal teeth; 1173. a protrusion; 118. an end cap; 1181. a cover body; 1182. an end cap bearing; 1183. a buckle plate; 12. a driving device; 121. a motor; 122. a second reduction gear; 123. a cable connector; 2. a rotating shaft; 3. a connecting piece; 4. a bracket; 5. an end face bearing cap.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, based on the examples in the application, which a person of ordinary skill in the art would obtain without inventive faculty, are within the scope of the utility model.

Example 1

As shown in fig. 1-11, a combined planetary gear reducer 1 comprises a reducer body 11 and a driving device 12, the driving device 12 is connected with the reducer body 11, the reducer body 11 comprises a shell 111, a first reduction gear 114, a first-stage planetary reduction mechanism 115, a second-stage planetary reduction mechanism 116, an annular gear 117 and an end cover 118, the end cover 118 is connected to one end of the shell 111, the first reduction gear 114 is rotatably connected in the shell 111, the first-stage planetary reduction mechanism 115 and the second-stage planetary reduction mechanism 116 are sequentially arranged along the axis of the first reduction gear 114, the annular gear 117 is arranged on the inner wall of the shell 111, the first-stage planetary reduction mechanism 115 and the second-stage planetary reduction mechanism 116 are respectively meshed with the annular gear 117, the middle part of the combined planetary gear reducer 1 is hollow, different rotary shafts 2 can be matched to drive seats with different specifications and numbers to complete overturning, and the self-locking of a backrest motor 121 can be realized by changing different driving devices 12, so that the load of the driving system is improved, and the safety life of the driving system is prolonged.

Further, the second-stage planetary reduction mechanism 116 comprises a second planetary disc 1161, a plurality of second planetary shafts 1162, a hollow cup shaft 1163, an axle center frame 1164 and a plurality of second planetary gears 1165, the hollow cup shaft 1163 is rotatably connected to the end cover 118, the hollow cup shaft 1163 is arranged on the second planetary disc 1161, the plurality of second planetary shafts 1162 are arranged around the axle center of the second planetary disc 1161, the second planetary shafts 1162 are connected with the second planetary disc 1161 in an interference fit mode, the axes of the second planetary shafts 1162 are parallel to the axes of the second planetary disc 1161, the plurality of second planetary gears 1165 are sleeved on the plurality of second planetary shafts 1162 in a one-to-one correspondence mode, the axle center frame 1164 is coaxially connected with the second planetary disc 1161, the plurality of second planetary gears 1165 are respectively meshed with the first sun gear 1154, one-stage planetary reduction and torque increase are achieved, and stability of transmission of the hollow cup shaft 1163 is improved through meshing relation with the plurality of second planetary gears 1165.

Preferably, the shaft hole of the hollow cup shaft 1163 is provided with a flat opening and is used for being matched with a shaft shoulder on the rotating shaft 2 to transmit power, a pillow block formed by protruding outwards on the edge of the shaft hole is sleeved on the pillow block through an end cover bearing 1182, so that the radial bearing capacity of the hollow cup shaft 1163 is improved, and the rotating of the rotating shaft 2 is stable and reliable.

Preferably, the second planetary disc 1161 is sleeved on the axle center frame 1164, a sleeve is arranged on the axle center frame 1164, the sleeve extends along the axial direction of the second planetary disc 1161, the first-stage planetary reduction mechanism 115 and the annular gear 117 are sleeved on the sleeve, the sleeve is used as the rotation center of the first-stage planetary reduction mechanism 115 and the annular gear 117, and the sleeve also serves as a passage for the rotating shaft 2 to pass through the reducer body 11.

Preferably, the first-stage planetary reduction mechanism 115 includes a first planetary disc 1151, a plurality of first planetary shafts 1152, a plurality of first planetary gears 1153 and a first sun gear 1154, the first planetary gears 1153 are disposed on the first planetary disc 1151, the plurality of first planetary shafts 1152 are distributed around the center of the first planetary disc 1151, the plurality of first planetary shafts 1152 are equally spaced to increase the carrying capacity and service life of the first-stage planetary reduction mechanism 115 by uniform load, the plurality of first planetary gears 1153 are sleeved on the plurality of first planetary shafts 1152 in a one-to-one correspondence manner, the first planetary disc 1151 and the first sun gear 1154 are hollow, and the first planetary disc 1151 is rotatably connected to the axle carrier 1164 with the axle carrier 1164 as a rotation center.

Preferably, the second-stage planetary reduction mechanism 116 further comprises a aligning spacer 1166, the aligning spacer 1166 is sleeved on the axle center frame 1164, the aligning spacer 1166 is installed at the end of the sleeve, which is close to the second planetary disc 1161, the aligning spacer 1166 is sleeved on the sleeve, one end of the aligning spacer 1166 is in interference with the second planetary disc 1161, the other end of the aligning spacer is in interference with the second-stage planetary reduction mechanism 116, and through superposition of the number of the aligning spacers 1166, the axial clearance of each reduction mechanism in the reducer body 11 can be controlled, and axial movement and vibration are prevented.

Preferably, the driving device 12 includes a motor 121, a second reduction gear 122 and a cable connector 123, the motor 121 is disposed on a side wall of the housing 111, the second reduction gear 122 is disposed on an output shaft of the motor 121, the second reduction gear 122 is engaged with the first reduction gear 114, and the cable connector 123 is disposed on a side wall of the motor 121 to connect a cable when being conveniently installed.

The second reduction gear 122 is a worm gear, the first reduction gear 114 is a duplex gear, the first reduction gear 114 includes a first external gear 1141 and a second external gear 1142, the first external gear 1141 is larger than the second external gear 1142, the second external gear 1142 may be a straight tooth or an oblique tooth, the first external gear 1141 is a worm gear engaged with the worm of the second reduction gear 122, so that the output torque can be increased, and the self-locking capability is provided, and the force of the backrest of the seat directly acts on the motor 121.

Preferably, the end cover 118 includes an end cover bearing 1182, a buckle plate 1183 and a cover body 1181, the end cover bearing 1182 is arranged on the end cover 118, an outer ring of the end cover bearing 1182 is sleeved in a through hole in the middle of the cover body 1181, an inner ring of the end cover bearing 1182 is sleeved on the sleeve, the buckle plate 1183 is arranged on the edge of the end cover 118 and extends along the axial direction of the end cover 118, the buckle plate 1183 is inserted into the boss 1173 and used for further clamping the annular gear 117 to prevent the annular gear 117 from bouncing, a plurality of mounting legs extend outwards from the edge of the cover body 1181 and are matched with the connecting piece 3 to connect the reducer body 11 to the bracket 4.

Preferably, the inner wall of the shell 111 is provided with a groove 1112, the outer wall of the annular gear 117 is provided with a protrusion 1173, the protrusion 1173 is matched with the groove 1112 and used for fixing the annular gear 117, the annular gear 117 is prevented from rotating along with the planetary gear mechanism in the rotation process, so that power output is attenuated, the inner teeth 1172 in the annular gear 117 are simultaneously used as meshing teeth of the first planetary gear 1153 and the second planetary gear 1165, the structure of the reducer body 11 is simplified, the production cost is reduced, the toothed ring 1171 of the annular gear 117 is integrally forged and formed, and the structural strength is high and is not easy to wear.

The casing 111 further includes a stepped hole 1111 and a platform 1113, the stepped hole 1111 is located at the center of the casing 111, the end face bearing cover 5 is installed in the stepped hole 1111 and used for axial positioning and supporting of the rotating shaft 2, the platform 1113 is used for connecting the motor 121, a through hole is formed in the platform 1113, and a motor bearing 112 is installed in the through hole and used for improving stability of rotation of an output shaft of the motor 121.

The automobile seat comprises a combined type planetary gear reducer 1, a rotating shaft 2, a carrier 4 and a backrest, wherein the rotating shaft 2 is sleeved with the combined type planetary gear reducer and fixedly connected with the backrest, and the combined type planetary gear reducer is detachably connected to the carrier 4.

The combined planetary reducer 1 is mounted on the carrier 4 through the connecting piece 3, the cross section of the carrier 4 is set to be U-shaped, the combined planetary reducer 1 is mounted between the U-shapes, the rotating shaft 2 is inserted into the combined planetary reducer 1 from one end of the combined planetary reducer 1, the rotating shaft 2 is coaxially clamped with the hollow cup shaft 1163, one end of the rotating shaft 2 penetrating through the combined planetary reducer 1 extends out of the carrier 4 and is clamped by the end face bearing cover 5 in a threaded connection mode, and the rotating shaft 2 is prevented from backing and shaking.

Preferably, a top gap nut 113 is mounted on one end of the housing 111 opposite to the motor 121, the top gap nut 113 is in threaded connection with the housing 111, one end of the top gap nut 113 is abutted against an output shaft of the motor 121, and by adjusting the position of the top gap nut 113, the motor shaft is reduced from bouncing along the axial direction when rotating, and the transmission stability is improved.

The working process of the combined planetary gear reducer is as follows:

the driving device 12 drives the second reduction gear 122 to rotate through power provided by the motor 121, the second reduction gear 122 is meshed with the first reduction gear 114 to drive the first reduction gear 114 to start to rotate, first-stage reduction torque increase is achieved, the second outer gear ring 1142 of the first reduction gear 114 is meshed with a plurality of first planetary gears 1153 of the first-stage planetary reduction mechanism 115 as a sun gear to push the first planetary gears 1151 to rotate, the first sun gear 1154 on the first planetary gears 1151 rotates simultaneously, the first sun gear 1154 is meshed with a plurality of second planetary gears 1165 on the second-stage planetary reduction mechanism 116 to drive the hollow cup shaft 1163 to rotate, the first planetary gears 1153 and the second planetary gears 1165 are meshed with the inner gear ring 117 in an external and internal mode, the hollow cup shaft 1163 is connected with the rotating shaft 2, power of the motor 121 is transmitted to a backrest of a seat through the rotating shaft 2 after three-stage rotating speed, and the backrest is pushed to automatically overturn and lift

Example two

As shown in fig. 12, the same features as those of the reference embodiment are not repeated, and the difference is that: the combined planetary gear reducer 1 further comprises a plurality of first-stage planetary reduction mechanisms 115, the plurality of first-stage planetary reduction mechanisms 115 are sequentially arranged along the axis of the first reduction gear 114, the output torque of the combined planetary gear reducer 1 is increased by superposing the plurality of first-stage planetary reduction mechanisms 115, the plurality of first-stage planetary reduction mechanisms 115 are all meshed with the annular gear 117, the integral planetary gear reducer 1 is compact in structure and small in installation occupation space, torque output can be controlled by controlling the number of the first-stage planetary reduction mechanisms 115, and the planetary gear reducer 1 can be used for overturning seats with different specifications or numbers, so that the applicable occasion is enlarged.

Variations and modifications to the above would be obvious to persons skilled in the art to which the utility model pertains from the foregoing description and teachings. Therefore, the utility model is not limited to the specific embodiments disclosed and described above, but some modifications and changes of the utility model should be also included in the scope of the claims of the utility model. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present utility model in any way.

Claims (10)

1. The utility model provides a combination formula planetary gear reducer, includes reduction gear body (11) and drive arrangement (12), drive arrangement (12) with reduction gear body (11) link to each other, its characterized in that: the speed reducer body (11) comprises a shell (111), a first reduction gear (114), a first-stage planetary reduction mechanism (115), a second-stage planetary reduction mechanism (116), an annular gear (117) and an end cover (118), wherein the end cover (118) is connected to one end of the shell (111), the first reduction gear (114) is rotationally connected to the shell (111), the first-stage planetary reduction mechanism (115) and the second-stage planetary reduction mechanism (116) are sequentially arranged along the axis of the first reduction gear (114), the annular gear (117) is arranged on the inner wall of the shell (111), the first-stage planetary reduction mechanism (115) and the second-stage planetary reduction mechanism (116) are respectively meshed with the annular gear (117), and the first reduction gear (114), the first-stage planetary reduction mechanism (115) and the second-stage planetary reduction mechanism (116) are hollow.

2. The combination planetary gear reducer of claim 1, wherein:

the second-stage planetary reduction mechanism (116) comprises a second planetary disc (1161), a plurality of second planetary shafts (1162), a hollow cup shaft (1163), an axle center frame (1164) and a plurality of second planetary gears (1165), wherein the hollow cup shaft (1163) is rotationally connected to the end cover (118), the hollow cup shaft (1163) is arranged on the second planetary disc (1161), the second planetary shafts (1162) are arranged around the axle center of the second planetary disc (1161), the second planetary gears (1165) are correspondingly sleeved on the second planetary shafts (1162) one by one, and the axle center frame (1164) is coaxially connected with the second planetary disc (1161).

3. The combination planetary gear reducer of claim 2, wherein:

the first-stage planetary reduction mechanism (115) comprises a first planetary disc (1151), a plurality of first planetary shafts (1152), a plurality of first planetary gears (1153) and a first sun gear (1154), wherein the first planetary gears (1153) are arranged on the first planetary disc (1151), the plurality of first planetary shafts (1152) are distributed around the center of the first planetary disc (1151), the plurality of first planetary gears (1153) are sleeved on the plurality of first planetary shafts (1152) in a one-to-one correspondence manner, the first planetary disc (1151) and the first sun gear (1154) are hollow, and the first planetary disc (1151) is rotationally connected on the axle center frame (1164).

4. A combination planetary gear reducer according to claim 3, characterized in that:

the second-stage planetary reduction mechanism (116) further comprises a centering gasket (1166), and the centering gasket (1166) is sleeved on the axle center frame (1164).

5. The combination planetary gear reducer of claim 4, wherein:

the driving device (12) comprises a motor (121) and a second reduction gear (122), the motor (121) is arranged on one side wall of the shell (111), the second reduction gear (122) is arranged on an output shaft of the motor (121), and the second reduction gear (122) is meshed with the first reduction gear (114).

6. The combination planetary gear reducer of claim 5, wherein:

the second reduction gear (122) is a worm gear and the first reduction gear (114) is a double gear.

7. The combination planetary gear reducer of claim 1, wherein:

the end cover (118) comprises an end cover bearing (1182) and a pinch plate (1183), wherein the end cover bearing (1182) is arranged on the end cover (118), and the pinch plate (1183) is arranged on the edge of the end cover (118) and extends along the axial direction of the end cover (118).

8. The combination planetary gear reducer of claim 7, wherein:

a groove (1112) is formed in the inner wall of the shell (111), a protrusion (1173) is formed in the outer wall of the annular gear (117), and the protrusion (1173) is matched with the groove (1112).

9. The combination planetary gear reducer according to any one of claims 1-8, wherein:

the planetary reduction gear system further comprises a plurality of first-stage planetary reduction mechanisms (115), and the plurality of first-stage planetary reduction mechanisms (115) are sequentially arranged along the axis of the first reduction gear (114).

10. An automobile seat, characterized in that: comprising a combined planetary gear reducer according to any one of claims 1-9, a rotating shaft (2), a carrier (4) and a backrest, said rotating shaft (2) being in register with said combined planetary gear reducer and being fixedly connected to said backrest, said combined planetary gear reducer being detachably connected to said carrier (4).

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