CN212422891U

CN212422891U - Electric height-adjusting device of automobile seat

Info

Publication number: CN212422891U
Application number: CN202022018710.0U
Authority: CN
Inventors: 邹耀忠
Original assignee: Jiangsu Zhongming Xianghe Seiko Co ltd
Current assignee: Jiangsu Zhongming Xianghe Seiko Co ltd
Priority date: 2020-09-15
Filing date: 2020-09-15
Publication date: 2021-01-29
Anticipated expiration: 2030-09-15

Abstract

The utility model provides an electronic height-adjusting device of car seat, includes the gearbox casing, and its one end is open mouthful setting and inside has the casing chamber, and one-level drive assembly is established to the casing intracavity, and driving motor is established to one side of gearbox casing, connects the worm on it, and the worm is connected with one-level drive assembly, establishes second grade drive assembly on the one-level drive assembly, and second grade drive assembly is connected with one-level drive assembly, establishes the connecting plate on the second grade drive assembly, and the connecting plate is fixed, characteristics with the gearbox casing: the first-stage transmission assembly comprises a reduction gear meshed with the worm and a rotating wheel coaxially connected with the reduction gear, and the rotating wheel is of an oval structure; the secondary transmission component comprises a movable tooth gear sleeve arranged in the cavity of the shell, a movable tooth transmission member arranged on the movable tooth gear sleeve and an output shaft arranged on the movable tooth transmission member, and the movable tooth transmission member is connected with the rotating wheel to form secondary speed reduction and transmit power to the output shaft. The bearing capacity is high, the transmission is stable and noiseless; the structure is compact, the assembly is convenient, and the volume is small; the cost is reduced.

Description

Electric height-adjusting device of automobile seat

Technical Field

The utility model belongs to the technical field of the car seat accessory, concretely relates to car seat's electronic height-adjusting device.

Background

Nowadays, as economic society develops, automobiles are more and more favored by people as transportation tools for people to go out conveniently in daily life and become necessities for family life. Whereas passenger or commercial vehicles such as automobiles are often equipped with a seat riser for raising and lowering passenger seats. Most of the existing seat adjusters are electrically operated, and manufacturers usually set knobs on vehicles for manual pushing or rotation of vehicle occupants to lift and lower the seats. The electric seat adjuster generally adopts a structure that a motor provides power, the power is reduced in two stages and then output by an output shaft, so that the power with high rotating speed and low torque of the motor is converted into the output power with low rotating speed and high torque. The specific working mode is as follows: the motor drives the worm to rotate, primary speed reduction is realized through the cooperation of the worm and the gear wheel and the eccentric wheel on the worm wheel drive the moving gear to be matched with the internal gear arranged on the output shaft to realize secondary speed reduction, and the seat of the vehicle is attached to the frame of the seat adjuster and supported on the frame of the seat adjuster, so that the seat and the frame of the seat adjuster move up and down together.

The published chinese patent documents do not contain technical information about the car seat height adjusting device, and there are, by way of example, a "car seat height adjusting mechanism" shown in CN104723910B, "a" car seat power height adjuster "disclosed in CN208498300U," a "gear assembly for a seat adjuster" described in CN11483360A, and the like, typically, "a seat height adjuster" as recommended in CN110356292A, which provides a height adjuster with a worm wheel having advantages of high strength and fatigue durability, the gear box includes a primary gear transmission close to the square motor rear cover assembly and a secondary gear transmission on a side of the primary gear transmission away from the square motor rear cover assembly, the primary gear transmission includes an armature worm and an eccentric worm wheel assembly, the armature worm and the eccentric worm wheel assembly are engaged with each other, helical teeth of the eccentric worm wheel assembly are semi-enveloping teeth, second grade gear drive is including sliding the slider in the gear box, the dish moves ring gear and output gear subassembly in the gear box, eccentric worm wheel subassembly is rotatory and drive the slider and slide in the gear box and ring gear's rule dish moves, ring gear's dish moves the rotatory second grade gear drive that realizes of drive output gear subassembly internal gearing difference tooth, eccentric worm wheel subassembly compares traditional worm wheel and has increased about 36% number of teeth in order to improve one grade of drive ratio, realize that less motor (low moment of torsion) provides higher electronic increaser output torque, thereby the intensity of reinforcing eccentric worm wheel subassembly skewed tooth satisfies the fatigue durability requirement, prolong motor life. However, the technical scheme has the following defects: one, because the technical scheme adopts the eccentric worm gear assembly to drive the sliding block to slide and the regular coiling of the ring gear, and the related eccentric worm gear assembly or the cam structure can also refer to the cam structure applied to a high-adjustment product of the seat shown in 'CN 210234717U', and because the eccentric worm gear (or the cam) is in point or line contact with the driven piece, the contact area is small, the stress is concentrated and the abrasion is easy, the power loss is large, the transmission efficiency is low, the contour machining precision requirement of the eccentric worm gear (or the cam) is high, the production difficulty is large, and the cost is high; secondly, the output gear assembly is adopted to realize second-stage gear transmission in a manner of internal-meshing differential gear rotation, namely, the internal gear and the external gear are arranged to be mutually meshed for transmission, the internal gear and the external gear are usually metal gears, so that the requirement on machining precision is high, once machining errors occur, the seat shakes and shakes when the height of the seat is adjusted, meanwhile, the internal gear and the external gear often make noise and abnormal sound when the seat is in joint transmission, and passengers consider that parts are damaged due to the shaking or the abnormal sound, so that unnecessary troubles are caused; thirdly, the height adjusting device adopting the cam transmission structure and the two-stage transmission mode of the meshing of the inner gear and the outer gear also has the defects of complex structure, large volume, high production cost and complex assembly.

In view of the above-mentioned prior art, there is a need for a reasonable improvement of the structure of the electric height-adjusting device of the existing car seat. The applicant has therefore made an advantageous design, in the context of which the solution to be described below is made.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a simple structure, reliable practical, thereby help becoming transmission's second grade speed reduction mode by cam drive mode and improving transmission efficiency and ensure long-time operation stationarity and reliability, thereby have the mode of being convenient for abandon the rotatory final power take off of inner gearing differential tooth and effectively solve the problem of car seat shake and casing abnormal sound, thereby be favorable to simplifying the structure and reduce the volume and reduce the car seat's of the product degree of difficulty and alleviate manufacturing cost electronic heightening device.

In order to achieve the above purpose, the utility model provides a technical scheme is: the utility model provides an automobile seat's electronic height-adjusting device, is including a gear box casing, and this gear box casing one end is open mouthful setting and its inside hollow casing chamber that is formed with, is provided with one-level transmission assembly in this casing intracavity, and is provided with a driving motor in one side of this gear box casing, and this driving motor is connected with a worm and this worm is connected and constitutes one-level speed reduction with one-level transmission assembly be provided with second grade transmission assembly on the one-level transmission assembly, this second grade transmission assembly is connected and constitutes the second grade speed reduction with the transmission of one-level transmission assembly the cover is equipped with a connecting plate on the second grade transmission assembly, and this connecting plate and gear box casing fixed mounting be in the same place, its characterized in that: the primary transmission assembly comprises a reduction gear meshed with the worm and a rotating wheel which is arranged on one side of the reduction gear, away from the gear box shell, and is coaxially connected with the reduction gear, and the rotating wheel is in an elliptical shape; the secondary transmission component comprises a movable tooth gear sleeve fixedly installed in the cavity of the shell, a movable tooth transmission member arranged on the movable tooth gear sleeve and an output shaft arranged on the movable tooth transmission member and fixed with the movable tooth transmission member, and the movable tooth transmission member and the rotating wheel are in transmission connection through a movable tooth transmission mode to form secondary speed reduction and transmit power to the output shaft.

In a specific embodiment of the present invention, the oscillating tooth transmission member is formed with an internally hollow oscillating tooth carrier at a side facing the rotating wheel, the rotating wheel is disposed in an internally hollow oscillating tooth carrier cavity of the oscillating tooth carrier and can be rotated therein, a plurality of roller oscillating tooth receiving grooves are uniformly formed on the oscillating tooth carrier and along a circumferential direction thereof, the roller oscillating tooth receiving grooves penetrate through a thickness direction of the oscillating tooth carrier and are respectively provided with a roller oscillating tooth in the roller oscillating tooth receiving grooves, a kinematic pair is formed between the plurality of roller oscillating teeth and the rotating wheel to realize an oscillating tooth transmission connection, axial end faces of a long axis of the rotating wheel are respectively contacted with the roller oscillating tooth in an operating state, an oscillating tooth platform disk is formed at a side of the oscillating tooth transmission member far away from the rotating wheel, an oscillating tooth platform disk center hole is formed at a center position of the oscillating tooth platform disk, and one end of the output shaft facing the oscillating tooth platform disc is provided with an output shaft riveting part which is embedded into the central hole of the oscillating tooth platform disc and is riveted and fixed inside.

In another specific embodiment of the present invention, a movable-teeth gear sleeve cavity is formed inside the movable-teeth gear sleeve, the movable-teeth gear carrier is disposed in the movable-teeth gear sleeve cavity, and a plurality of roller movable-teeth guide grooves for sliding the roller movable teeth are formed on an inner peripheral side wall of the movable-teeth gear sleeve cavity, and the plurality of roller movable-teeth guide grooves together form an envelope curve of a roller movable-teeth circle; the movable-tooth gear sleeve is provided with a circle of limiting bosses on the surface of one side facing the movable-tooth platform disc and along the circumferential direction of the movable-tooth platform disc, the movable-tooth platform disc is provided with a circle of limiting grooves on the surface of one side facing the movable-tooth gear sleeve and at the positions corresponding to the circle of limiting bosses, and the limiting bosses are arranged in the limiting grooves.

In another specific embodiment of the present invention, a reduction gear spline groove is formed at the center of the reduction gear, and a rotating wheel spline groove is formed at the center of the rotating wheel, and a spline shaft is sequentially embedded in the reduction gear spline groove and the rotating wheel spline groove to realize the coaxial connection between the reduction gear and the rotating wheel; the rotating wheel is provided with a rotating wheel boss on the surface of one side facing the reduction gear and protruding outside in the circumferential direction corresponding to the spline groove of the rotating wheel, a spacing disc is arranged between two opposite side faces of the reduction gear and the rotating wheel and outside in the circumferential direction of the rotating wheel boss, a spacing disc center hole is arranged at the center of the spacing disc, a spacing disc inner ring step is formed at the peripheral side edge of the spacing disc center hole, and a buffer sleeve with the cross section in the shape of Contraband is sleeved on the spacing disc inner ring step.

In another specific embodiment of the present invention, the movable-tooth gear sleeve has a spacer accommodating cavity formed on a surface of a side facing the spacer, and the spacer is disposed in the spacer accommodating cavity; the movable-tooth gear sleeve fixing device is characterized in that a movable-tooth gear sleeve step is formed in a shell cavity of the gearbox shell, the movable-tooth gear sleeve is supported on the movable-tooth gear sleeve step, a plurality of movable-tooth gear sleeve fixing blocks are arranged on the surface of the outer periphery of the movable-tooth gear sleeve and are arranged at intervals in a protruding mode in the circumferential direction, a movable-tooth sleeve fixing groove is formed in the position, corresponding to the movable-tooth gear sleeve fixing blocks, of the gearbox shell, and each movable-tooth gear sleeve fixing block is clamped in the corresponding movable-tooth sleeve fixing groove, so that the movable-tooth gear sleeve and the gearbox shell are fixedly connected.

In yet another specific embodiment of the present invention, a connecting plate center hole is formed at a position corresponding to the output shaft on the connecting plate, a connecting plate inner boss is formed at an outer side of the connecting plate center hole in the circumferential direction, and the oscillating tooth platform plate is accommodated at an inner side of the connecting plate inner boss; the gearbox shell is characterized in that a plurality of limiting grooves are arranged on the connecting plate at intervals, limiting blocks are respectively arranged on one side surface of the gearbox shell facing the connecting plate in a protruding mode at positions corresponding to the limiting grooves, the limiting blocks are embedded in the limiting grooves, a plurality of connecting plate screw holes are arranged on the connecting plate and on the outer side of the boss in the connecting plate at intervals, shell screw holes are respectively formed in one side surface of the gearbox shell facing the connecting plate and at positions corresponding to the connecting plate screw holes, fixing screws are arranged on the connecting plate screw holes in a matched mode, and the fixing screws are screwed into the shell screw holes so that the gearbox shell is fixedly connected with the connecting plate.

The present invention further provides a method for assembling a gear box, comprising the steps of inserting a connecting plate into a box, inserting a connecting plate into the box, inserting a bushing into the connecting plate, inserting the bushing into the box, and inserting the bushing into the box, wherein the bushing is formed with a bushing platform plate facing the movable tooth driving member, and the bushing platform plate is disposed between the connecting plate and the movable tooth platform plate.

In a more specific embodiment of the present invention, an output shaft gear is formed on the shaft body of the output shaft which is not received in the bushing, and a support shaft is formed in the middle of the output shaft gear and away from the connecting plate in the axial direction of the output shaft.

In yet another specific embodiment of the present invention, the driving motor is connected to a motor transmission shaft, the motor transmission shaft is inserted into the gear box housing and the worm is fixedly connected to the motor transmission shaft, a worm accommodating groove is formed in one side of the housing cavity of the gear box housing, the worm accommodating groove is connected to the housing cavity, and the worm is accommodated in the worm accommodating groove.

In a still more specific embodiment of the present invention, a spline shaft supporting groove is formed on a bottom plate of the gear case housing opposite to the open port side surface and at a position corresponding to the spline shaft, the spline shaft is rotatably supported by the spline shaft supporting groove, and the spline shaft is formed with a spline shaft positioning post toward the output shaft along an axial direction of the spline shaft at a middle position away from an end surface of the spline shaft supporting groove, and an output shaft positioning hole is provided on the output shaft and at a position corresponding to the spline shaft positioning post, the spline shaft positioning post being received in the output shaft positioning hole.

The utility model provides one of the technical scheme's technical effect, because change the second grade speed reduction mode among the transmission into the oscillating tooth transmission mode by the cam drive mode, compare in the cam drive mode cam only with form the less area of contact of point or line contact between the follower, because the running wheel is oval shape and its axial both ends terminal surface of major axis contacts with the roller oscillating tooth respectively in this oscillating tooth transmission mode, like this at most half roller oscillating tooth contacts with the running wheel, bearing capacity is high, transmission efficiency greatly increased, the continuous contact form of the oscillating tooth transmission conjugate tooth of roller oscillating tooth and running wheel, avoided the impact of nibbling out, the transmission is steady noiseless; secondly, because an internal-meshing differential-tooth rotating final power output mode is abandoned, a mode that a movable tooth transmission part is directly riveted and fixed with an output shaft is adopted, and the movable-tooth transmission mode enables an output mechanism and a movable-tooth gear carrier to be integrated, so that a kinematic chain between a rotating wheel and the output shaft is shortened, the structure is simple, the hierarchy is clear, the transmission efficiency is high, and the problems of seat shaking and abnormal sound generated in a gear box shell in the process of height adjustment of the seat are further solved stably and reliably; thirdly, compared with the cam transmission structure and the internal engagement differential tooth rotating structure in the original two-stage speed reduction mode, the structure is simple, novel and compact, the production and the assembly are convenient, and the radial and axial sizes of the rotating wheel and the movable tooth transmission part are very small, so that the volume is greatly reduced; and fourthly, because an internal-meshing differential-tooth rotating structure in a two-stage speed reduction mode is abandoned, gears do not need to be produced or gear teeth do not need to be machined on parts, and compared with a more precise machining mode of a cam, the driving wheel adopts a self-balancing elliptical shape, the machining process is simple on the whole, the production process is greatly simplified, and the cost is reduced.

Drawings

Fig. 1 is a perspective structural view of an embodiment of the present invention.

Fig. 2 is an exploded perspective view of a transmission mechanism according to an embodiment of the present invention.

Fig. 3 is a sectional view of a planar structure of a transmission mechanism according to an embodiment of the present invention.

Fig. 4 is a rear view of the oscillating tooth transmission assembly according to an embodiment of the present invention.

In the figure: 1. the gear box comprises a gear box shell, 11 parts of a shell cavity, 111 parts of a movable-tooth gear sleeve step, 12 parts of a spline shaft supporting groove, 13 parts of a movable-tooth sleeve fixing groove, 14 parts of a worm accommodating groove, 15 parts of a driving motor, 151 parts of a motor transmission shaft, 16 parts of a worm, 17 parts of a shell screw hole, 18 parts of a limiting block;

2. the gear box comprises a primary transmission assembly, 21 speed reducing gears, 211 speed reducing gear spline grooves, 22 spline shafts, 221 spline shaft positioning columns, 23 spacing discs, 231 spacing disc center holes, 232 spacing disc inner ring steps, 24 buffering sleeves, 25 rotating wheels, 251 rotating wheel spline grooves and 252 rotating wheel bosses;

3. the secondary transmission assembly comprises a secondary transmission assembly, 31, a movable gear sleeve, 311, a movable gear sleeve cavity, 312, a roller movable tooth guide groove, 313, a movable gear sleeve fixing block, 314, a spacing disc accommodating cavity, 315, a limiting boss, 32, a movable tooth transmission piece, 321, a movable gear carrier, 3211, a movable gear carrier inner cavity, 3212, a roller movable tooth accommodating groove, 322, a roller movable tooth, 323, a movable tooth platform disc, 3231, a limiting groove, 3232, a movable tooth platform disc central hole, 33, an output shaft, 331, an output shaft riveting part, 332, an output shaft gear, 333, a support shaft, 334, an output shaft positioning hole, 34, a bushing, 341, a bushing inner cavity, 342 and a bushing platform plate;

4. the connecting plate, 41, connecting plate centre bore, 42, connecting plate boss, 43, spacing groove, 44, connecting plate screw hole, 441, set screw.

Detailed Description

The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, but the description of the embodiments is not intended to limit the technical solutions, and any changes made in the form of the present invention rather than the essential changes should be considered as the protection scope of the present invention.

In the following description, any concept relating to the directions or orientations of up, down, left, right, front, and rear is given with respect to the position of the drawing being described, and thus should not be construed as particularly limiting the technical solution provided by the present invention.

Referring to fig. 1 to 4, an electric height-adjusting device for a car seat is shown, in order to achieve the above object, the present invention provides a technical solution: the utility model provides an electronic height-adjusting device of car seat, including = there is a

gear box casing

1, 1 one end of this gear box casing is open mouthful setting and its inside hollow casing chamber 11 that is formed with, be provided with one-level transmission assembly 2 in this casing chamber 11, and be provided with a driving motor 15 in one side of this gear box casing 1, this driving motor 15 is connected with a worm 16 and this worm 16 is connected with the transmission of one-level transmission assembly 2 and constitutes one-level speed reduction, be provided with second grade transmission assembly 3 on aforementioned one-level transmission assembly 2, this second grade transmission assembly 3 is connected with the transmission of one-level transmission assembly 2 and constitutes second grade speed reduction, be equipped with a connecting plate 4 on aforementioned second grade transmission assembly 3, and this connecting plate 4 is in the same place with gear box casing 1 fixed mounting.

As the technical essential of the utility model: the primary transmission assembly 2 comprises a reduction gear 21 engaged with the worm 16 and a rotating wheel 25 arranged on one side of the reduction gear 21 far away from the gearbox shell 1 and coaxially connected with the reduction gear, wherein the rotating wheel 25 is in an elliptic shape; the secondary transmission assembly 3 includes an oscillating-tooth gear sleeve 31 fixedly installed in the housing cavity 11, an oscillating-tooth transmission member 32 disposed on the oscillating-tooth gear sleeve 31, and an output shaft 33 disposed on the oscillating-tooth transmission member 32 and fixed thereto, the oscillating-tooth transmission member 32 and the rotating wheel 25 are in transmission connection in an oscillating-tooth transmission manner to form a secondary speed reduction and transmit power to the output shaft 33, so that a secondary speed reduction is formed between the primary transmission assembly 2 and the secondary transmission assembly 3.

Please refer to fig. 3 and 4, the movable gear carrier 321 is formed on one side of the movable gear transmission member 32 facing the rotary wheel 25, the rotary wheel 25 is disposed in the hollow movable gear carrier inner cavity 3211 of the movable gear carrier 321 and can rotate therein, a plurality of roller movable gear accommodating grooves 3212 are uniformly formed on the movable gear carrier 321 and along the circumferential direction, the roller movable gear accommodating grooves 3212 penetrate the thickness direction of the movable gear carrier 321 and are respectively provided with a roller movable gear 322 in the roller movable gear accommodating grooves 3212, a kinematic pair is formed between the plurality of roller movable gears 322 and the rotary wheel 25 to realize movable gear transmission connection, in the working state, the axial end surfaces of the two ends of the long axis of the rotary wheel 25 are respectively contacted with the roller movable gear 322, and a movable gear platform disc 323 is formed at one end of the movable gear transmission member 32 far away from the rotary wheel 25, a center hole 3232 of the oscillating-tooth platform plate 323 is formed at a center position of the oscillating-tooth platform plate 323, and an output shaft riveting portion 331 is formed at an end of the output shaft 33 facing the oscillating-tooth platform plate 323, and the output shaft riveting portion 331 is inserted into the center hole 3232 of the oscillating-tooth platform plate and is riveted and fixed therein.

In this embodiment, a movable-tooth gear sleeve cavity 311 is formed inside the movable-tooth gear sleeve 31, the movable-tooth gear carrier 321 is disposed in the movable-tooth gear sleeve cavity 311, and a plurality of roller movable-tooth guide grooves 312 for the sliding of the roller movable teeth 322 are formed on the inner peripheral side wall of the movable-tooth gear sleeve cavity 311, and the plurality of roller movable-tooth guide grooves 312 together form an envelope curve of the roller movable teeth 322 circle; the above-mentioned movable-teeth gear sleeve 31 is formed with a circle of limit bosses 315 on a side surface facing the movable-teeth platform plate 323 and along a circumferential direction thereof, and the above-mentioned movable-teeth platform plate 323 is formed with a circle of limit grooves 3231 on a side surface facing the movable-teeth gear sleeve 31 and at positions corresponding to the circle of limit bosses 315, and the limit bosses 315 are disposed in the limit grooves 3231.

It should be noted that in the present embodiment, a two-stage speed reduction mode of roller oscillating tooth transmission is adopted between the primary transmission assembly 2 and the secondary transmission assembly 3, and in addition to the oscillating tooth transmission mode of roller oscillating tooth transmission, oscillating tooth transmission modes such as push rod oscillating tooth transmission, swing oscillating tooth transmission, sleeve oscillating tooth transmission and the like can be adopted, and the related technical information of the above different oscillating tooth transmission modes can refer to the oscillating tooth transmission theory published by mechanical industry publisher 1993 in 4 months.

Further, a reduction gear spline groove 211 is formed in the center of the reduction gear 21, a rotating wheel spline groove 251 is formed in the center of the rotating wheel 25, and a spline shaft 22 is sequentially embedded in the reduction gear spline groove 211 and the rotating wheel spline groove 251 to realize coaxial connection between the reduction gear 21 and the rotating wheel 25; a rotating wheel boss 252 is convexly arranged on one side surface of the rotating wheel 25 facing the reduction gear 21 and on the circumferential outer side corresponding to the rotating wheel spline groove 251, a spacing disc 23 is arranged between two opposite side surfaces of the reduction gear 21 and the rotating wheel 25 and on the circumferential outer side of the rotating wheel boss 252, a spacing disc center hole 231 is arranged at the center position of the spacing disc 23, a spacing disc inner ring step 232 is formed at the circumferential edge position of the spacing disc center hole 231, and a buffer sleeve 24 with the shape of Contraband in cross section is sleeved on the spacing disc inner ring step 232.

Further, the above-mentioned movable gear sleeve 31 is formed with a spacing disc accommodating cavity 314 on a side surface facing the spacing disc 23, and the spacing disc 23 is disposed in the spacing disc accommodating cavity 314; a movable-tooth gear sleeve step 111 is formed in the housing cavity 11 of the gear box housing 1, the movable-tooth gear sleeve 31 is supported on the movable-tooth gear sleeve step 111, a plurality of movable-tooth gear sleeve fixing blocks 313 are arranged on the surface of the outer periphery of the movable-tooth gear sleeve 31 at intervals and in a protruding manner around the circumferential direction, movable-tooth sleeve fixing grooves 13 are respectively formed in positions on the gear box housing 1 corresponding to the movable-tooth gear sleeve fixing blocks 313, and the movable-tooth gear sleeve fixing blocks 313 are respectively clamped in the corresponding movable-tooth sleeve fixing grooves 13, so that the movable-tooth gear sleeve 31 is fixedly connected with the gear box housing 1.

Referring to fig. 1 and 2, a connecting plate center hole 41 is formed in the connecting plate 4 at a position corresponding to the output shaft 33, a connecting plate inner boss 42 is formed at an outer side of the connecting plate center hole 41 in a circumferential direction, and the oscillating tooth platform plate 323 is accommodated at an inner side of the connecting plate inner boss 42; a plurality of limit grooves 43 are spaced apart from each other on the connecting plate 4, a limit block 18 is protruded from a surface of the gear case 1 facing the connecting plate 4 at a position corresponding to the limit groove 43, the limit block 18 is fitted into the limit groove 43, a plurality of connecting plate screw holes 44 are spaced apart from each other on the connecting plate 4 and outside the boss 42 in the connecting plate, a case screw hole 17 is opened in a surface of the gear case 1 facing the connecting plate 4 at a position corresponding to the connecting plate screw hole 44, a fixing screw 441 is provided on the connecting plate screw hole 44, and the fixing screw 441 is screwed into the case screw hole 17 to fixedly connect the gear case 1 and the connecting plate 4. The number of the aforementioned connecting plate screw holes 44 and fixing screws 441 is four in the present embodiment, and the connecting plate screw holes 44 are arranged in a diagonally intersecting manner.

In the present embodiment, the output shaft 33 passes through the connecting plate center hole 41 of the connecting plate 4 and a bushing 34 is provided between the output shaft 33 and the connecting plate center hole 41, a bushing inner cavity 341 is formed inside the bushing 34, and the output shaft 33 is received in the bushing inner cavity 341, the bushing 34 is formed with a bushing platform plate 342 on a side facing the oscillating tooth transmission member 32, and the bushing platform plate 342 is provided between both side surfaces of the connecting plate 4 opposite to the oscillating tooth platform plate 323.

Further, an output shaft gear 332 is formed on a shaft body of the output shaft 33 not accommodated in the bush 34, and a support shaft 333 is formed in the middle of the output shaft gear 332 and away from the connecting plate 4 in the axial direction of the output shaft 33.

Further, the driving motor 15 is connected with a motor transmission shaft 151 in a transmission manner, the motor transmission shaft 151 is inserted into the gearbox housing 1, the worm 16 is fixedly connected to the motor transmission shaft 151, a worm accommodating groove 14 is formed in one side of the housing cavity 11 of the gearbox housing 1, the worm accommodating groove 14 is communicated with the housing cavity 11, and the worm 16 is accommodated in the worm accommodating groove 14.

Preferably, a spline shaft supporting groove 12 is formed on a bottom plate of the gear case housing 1 opposite to the opening side surface and at a position corresponding to the spline shaft 22, the spline shaft 22 is rotatably supported in the spline shaft supporting groove 12, a spline shaft positioning hole 221 is formed at a middle position of an end surface of the spline shaft 22 away from the spline shaft supporting groove 12 and toward the output shaft 33 in the axial direction of the spline shaft 22, and an output shaft positioning hole 334 is opened on the output shaft 33 and at a position corresponding to the spline shaft positioning hole 221, the spline shaft positioning hole 334 being received in the output shaft positioning hole 334.

The working principle is as follows: by fixedly connecting the connecting plate 4 with the car seat, the end of the output shaft 33 is rotatably supported on the car seat and the output gear 253 is in transmission connection with the height adjusting mechanism in the car seat, when the rider adjusts the height of the car seat, the electric button drives the driving motor 15 to move, at this time, the motor transmission shaft 151 and the worm 16 rotate, and the worm 16 further drives the reduction gear 21 engaged therewith to rotate, at this time, one-time speed reduction of the output power of the driving motor 15 is completed, and then the reduction gear 21 drives the spline shaft 22 and the rotating wheel 25 to move, at this time, the rotating wheel 25 regularly coils in the inner cavity 3211 of the oscillating gear rack and generates radial thrust, so as to force the oscillating teeth 322 contacting with the working surface of the roller wheel 25 to move, at this time, the surface of the oscillating teeth 322 not contacting with the rotating wheel 25 rolls along the roller oscillating teeth guide groove 312 of the oscillating gear sleeve 31, meanwhile, the oscillating-tooth platform disc 323 is driven to rotate by pushing the oscillating-tooth gear rack 321, the roller oscillating teeth 322 contacted with the rotating wheel 25 move at a working position along the roller oscillating-tooth guide grooves 312 under the pushing of the oscillating-tooth gear rack 321 so as to wait for being contacted with the rotating wheel 25, the regular low-speed rotation of the oscillating-tooth transmission piece 32 is realized, the secondary speed reduction of the output power is finished, and finally the output shaft 33 is driven to rotate by the oscillating-tooth platform disc 323, and the height adjustment operation of the automobile seat is realized.

To sum up, the technical solution provided by the present invention remedies the defects in the prior art, successfully completes the invention task, and faithfully embodies the technical effects mentioned in the above technical effect column by the applicant.

Claims

1. An electric height adjusting device of an automobile seat comprises a gearbox shell (1), wherein one end of the gearbox shell (1) is arranged in an open port manner, a hollow shell cavity (11) is formed in the gearbox shell, a primary transmission assembly (2) is arranged in the shell cavity (11), a driving motor (15) is arranged on one side of the gearbox shell (1), the driving motor (15) is connected with a worm (16), the worm (16) is in transmission connection with the primary transmission assembly (2) to form primary speed reduction, a secondary transmission assembly (3) is arranged on the primary transmission assembly (2), the secondary transmission assembly (3) is in transmission connection with the primary transmission assembly (2) to form secondary speed reduction, a connecting plate (4) is sleeved on the secondary transmission assembly (3), and the connecting plate (4) is fixedly installed with the gearbox shell (1), the method is characterized in that: the primary transmission assembly (2) comprises a reduction gear (21) meshed with the worm (16) and a rotating wheel (25) which is arranged on one side of the reduction gear (21) far away from the gearbox shell (1) and is coaxially connected with the reduction gear, and the rotating wheel (25) is in an oval shape; the secondary transmission assembly (3) comprises a movable-tooth gear sleeve (31) fixedly installed in the shell cavity (11), a movable-tooth transmission piece (32) arranged on the movable-tooth gear sleeve (31) and an output shaft (33) arranged on the movable-tooth transmission piece (32) and fixed with the movable-tooth transmission piece, and the movable-tooth transmission piece (32) is in transmission connection with the rotating wheel (25) in a movable-tooth transmission mode to form secondary speed reduction and transmit power to the output shaft (33).

2. The electric height adjusting device of the car seat as claimed in claim 1, wherein the oscillating tooth transmission member (32) is formed with an internally hollow oscillating tooth carrier (321) at a side facing the rotating wheel (25), the rotating wheel (25) is arranged in an internally hollow oscillating tooth carrier cavity (3211) of the oscillating tooth carrier (321) and can be rotated therein, a plurality of roller oscillating tooth receiving grooves (3212) are uniformly formed on the oscillating tooth carrier (321) along a circumferential direction thereof at intervals, the roller oscillating tooth receiving grooves (3212) penetrate through a thickness direction of the oscillating tooth carrier (321) and are respectively provided with an oscillating tooth (322) in the roller oscillating tooth receiving groove (3212), a kinematic pair is formed between the plurality of roller oscillating teeth (322) and the rotating wheel (25) to realize the oscillating tooth transmission connection, end faces at both axial ends of a long axis of the rotating wheel (25) are respectively contacted with the roller oscillating tooth (322) in a working state, and one end of the movable tooth transmission piece (32) far away from the rotating wheel (25) is provided with a movable tooth platform disc (323), the central position of the movable tooth platform disc (323) is provided with a movable tooth platform disc central hole (3232), one end of the output shaft (33) facing the movable tooth platform disc (323) is provided with an output shaft riveting part (331), and the output shaft riveting part (331) is embedded into the movable tooth platform disc central hole (3232) and is riveted and fixed inside.

3. The electric height adjusting device of the car seat as claimed in claim 2, wherein a movable-teeth gear sleeve cavity (311) is formed inside the movable-teeth gear sleeve (31), the movable-teeth gear carrier (321) is arranged inside the movable-teeth gear sleeve cavity (311), and a plurality of roller movable-teeth guide grooves (312) for the roller movable teeth (322) to slide are formed on the inner peripheral side wall of the movable-teeth gear sleeve cavity (311), and the plurality of roller movable-teeth guide grooves (312) together form an envelope curve of the circle group of the roller movable teeth (322); the movable-tooth gear sleeve (31) is provided with a circle of limiting boss (315) on one side surface facing the movable-tooth platform disc (323) and along the circumferential direction of the movable-tooth platform disc, the movable-tooth platform disc (323) is provided with a circle of limiting groove (3231) on one side surface facing the movable-tooth gear sleeve (31) and at a position corresponding to the circle of limiting boss (315), and the limiting boss (315) is arranged in the limiting groove (3231).

4. The electric height adjusting device of the car seat as claimed in claim 1, wherein a reduction gear spline groove (211) is formed at the center of the reduction gear (21), a rotating wheel spline groove (251) is formed at the center of the rotating wheel (25), and a spline shaft (22) is sequentially embedded in the reduction gear spline groove (211) and the rotating wheel spline groove (251) to realize the coaxial connection of the reduction gear (21) and the rotating wheel (25); the rotating wheel (25) is provided with a rotating wheel boss (252) on the surface of one side facing the reduction gear (21) and protruding on the outer side in the circumferential direction corresponding to the spline groove (251) of the rotating wheel, a spacing disc (23) is arranged between two opposite side faces of the reduction gear (21) and the rotating wheel (25) and on the outer side in the circumferential direction of the rotating wheel boss (252), a spacing disc central hole (231) is formed in the central position of the spacing disc (23), a spacing disc inner ring step (232) is formed in the position of the peripheral side edge of the spacing disc central hole (231), and a buffer sleeve (24) with the cross section in the shape of 'Contraband' is sleeved on the spacing disc inner ring step (232).

5. The electric height-adjusting device of the car seat as claimed in claim 4, wherein the loose-teeth gear sleeve (31) is formed with a spacer disk accommodating chamber (314) on a side surface facing the spacer disk (23), and the spacer disk (23) is disposed in the spacer disk accommodating chamber (314); a movable-tooth gear sleeve step (111) is formed in a shell cavity (11) of the gear box shell (1), the movable-tooth gear sleeve (31) is supported on the movable-tooth gear sleeve step (111), a plurality of movable-tooth gear sleeve fixing blocks (313) are arranged on the surface of the outer periphery of the movable-tooth gear sleeve (31) at intervals and in a protruding mode around the circumferential direction, movable-tooth sleeve fixing grooves (13) are respectively formed in positions, corresponding to the movable-tooth gear sleeve fixing blocks (313), on the gear box shell (1), and the movable-tooth gear sleeve fixing blocks (313) are respectively clamped in the corresponding movable-tooth sleeve fixing grooves (13), so that the movable-tooth gear sleeve (31) is fixedly connected with the gear box shell (1).

6. The electric height adjusting apparatus for the vehicle seat according to claim 2, wherein a link plate center hole (41) is formed at a position corresponding to the output shaft (33) on the link plate (4), a link plate inner boss (42) is formed at an outer side in a circumferential direction of the link plate center hole (41), and the oscillating tooth platform plate (323) is received at an inner side of the link plate inner boss (42); a plurality of limiting grooves (43) are arranged on the connecting plate (4) at intervals, a limiting block (18) is respectively arranged on one side surface of the gearbox shell (1) facing the connecting plate (4) in a protruding way and at the position corresponding to the limiting grooves (43), the limiting block (18) is embedded in the limiting groove (43), a plurality of connecting plate screw holes (44) are arranged on the connecting plate (4) and at intervals on the outer side of the connecting plate inner boss (42), a shell screw hole (17) is respectively arranged on one side surface of the gearbox shell (1) facing the connecting plate (4) and at the position corresponding to the connecting plate screw hole (44), a fixing screw (441) is arranged on the connecting plate screw hole (44), and the fixing screw (441) is screwed into the housing screw hole (17) to fixedly connect the gearbox housing (1) and the connecting plate (4).

7. An electric height adjusting device of a car seat according to claim 6, characterized in that the output shaft (33) passes through the connecting plate center hole (41) of the connecting plate (4) and a bushing (34) is provided between the output shaft (33) and the connecting plate center hole (41), the bushing (34) is internally formed with a bushing inner cavity (341), and the output shaft (33) is received in the bushing inner cavity (341), the bushing (34) is formed with a bushing platform plate (342) at a side facing the oscillating tooth transmission member (32), and the bushing platform plate (342) is provided between both side surfaces of the connecting plate (4) opposite to the oscillating tooth platform plate (323).

8. An electric height adjusting device of an automobile seat according to claim 7, characterized in that an output shaft gear (332) is formed on a shaft body of the output shaft (33) not accommodated in the bush (34), and a support shaft (333) is formed in the middle of the output shaft gear (332) and away from the connecting plate (4) in the axial direction of the output shaft (33).

9. The electric height adjusting device of the car seat as claimed in claim 1, wherein the driving motor (15) is connected with a motor transmission shaft (151) in a transmission manner, the motor transmission shaft (151) is arranged in the gearbox housing (1) in a penetrating manner, the worm (16) is fixedly connected with the motor transmission shaft (151), a worm accommodating groove (14) is formed in one side of the housing cavity (11) of the gearbox housing (1), the worm accommodating groove (14) is communicated with the housing cavity (11), and the worm (16) is accommodated in the worm accommodating groove (14).

10. An electric height adjuster of a vehicle seat according to claim 4, wherein a spline shaft supporting groove (12) is formed on a bottom plate of said gear housing (1) opposite to the open port side surface and at a position corresponding to said spline shaft (22), said spline shaft (22) is rotatably supported in said spline shaft supporting groove (12), and a spline shaft positioning post (221) is formed on said output shaft (33) and at a position corresponding to said spline shaft positioning post (221), a spline shaft positioning hole (334) is bored at a central position of an end surface of said spline shaft (22) away from said spline shaft supporting groove (12) and toward said output shaft (33) in an axial direction of said spline shaft (22), said spline shaft positioning post (221) being received in said output shaft positioning hole (334).