Automobile seat height adjusting device

Abstract

An automobile seat height adjusting device comprises a driving motor, a shell and a seat fixing and connecting plate, the lower portion of the shell extends to form a worm seat, a worm seat cavity is communicated with a shell cavity, the driving motor is fixed to the shell, the seat fixing and connecting plate is fixed to the shell, and a gear seat cavity is formed in the middle of the seat fixing and connecting plate. A driving wheel receding hole is formed in the center of the left side of the gear seat cavity. The transmission device is characterized in that the transmission device comprises a first-stage transmission mechanism, a second-stage transmission mechanism and a third-stage transmission mechanism, the first-stage transmission mechanism is arranged in a shell cavity and is in transmission connection with a driving motor shaft, the second-stage transmission mechanism is arranged in the shell cavity and is in transmission fit with the first-stage transmission mechanism, and the third-stage transmission mechanism is arranged in a driving wheel receding hole; the right side of the third-level transmission mechanism is matched with the second-level transmission mechanism, and the left side of the third-level transmission mechanism extends out of the driving wheel receding hole. The speed reducer has the advantages of simplifying the structure, reducing the weight, reasonably reducing the size, improving the transmission efficiency, reducing noise and vibration and reducing the fault probability.

Description

Technical Field

[0001] The utility model belongs to the technical field of automotive parts, and particularly relates to an automobile seat height adjusting device. Background Art

[0002] The purpose of adjusting the height of an automobile seat is to enable the driver and passengers to adjust the seat height according to their own needs, such as their height, driving and riding habits, and comfort requirements, for example, to obtain a desired comfortable and safe posture. Adjusting the height of the automobile seat also helps to reduce the fatigue caused by long-term driving and riding. In short, the functions of adjusting the height of the automobile seat include but are not limited to: improving the field of vision, reducing leg fatigue, optimizing the convenience of operation, enhancing comfort, promoting and even ensuring safe driving, and so on.

[0003] There is no lack of technical information about automobile seat adjustment in the published Chinese patent literature. For example, "an electric seat height adjuster for automobiles" recommended by CN208498300U has four-level adjustment, specifically: the first-level transmission is driven by a gearbox to drive an eccentric worm gear; the second-level transmission is driven by the eccentric worm gear to drive a slider; the third-level transmission is driven by the slider to drive an annular gear; the fourth-level transmission is driven by the annular gear to drive an output gear assembly. Another example is that CN110356291A & CN110356292A provide "an electric seat height adjuster for automobiles" and "a seat height adjuster", and the four-level adjustment processes of these two patents are exactly the same as those of the aforementioned CN208498300U. Still another example is "an electric height adjusting device for an automobile seat" introduced by CN111114398A. The four-level transmission process of this patent is: the first-level transmission is driven by a worm (referred to as "screw" in the patent) to drive a reduction gear (substantially a worm gear); the second-level transmission is driven by the reduction gear to drive a moving gear; the third-level transmission is driven by the moving gear to drive a floating disc; the fourth-level reduction is driven by the floating disc to drive an output shaft (for the process of adjusting the height of the automobile seat, refer to the last paragraph of the specification of this patent).

[0004] The following general drawbacks exist not only in the patents listed above: First, in order to achieve or reach the purpose of adjusting the height of the car seat, four-stage transmission is required, so the number of transmission stages is large. The technical problems brought by a large number of transmission stages are complex structure, reduced efficiency, increased noise and vibration, high failure probability, and increased weight and volume. Second, due to the existence of a sliding fit transmission link, sliding fit will exacerbate wear, shorten the service life of components, reduce transmission efficiency, increase energy consumption, intensify noise and vibration, and reduce precision and stability. For example, the sliding fit may become loose or fail under impact or vibration, affecting the stability of the car seat height adjustment device. Third, due to the unreasonable configuration of the second-stage transmission structure, the structure is not compact, the volume is difficult to reduce, the transmission efficiency is low, the load is low, the transmission ratio is small, the transmission (i.e., motion) precision and reliability are relatively low, and the function has great limitations. Fourth, without discrimination, all components such as worm wheels and output gears that cooperate with worm drives are all made of metal worm wheels and metal gears. Although components made of pure metal have the advantages of high strength and good durability, the transmission components made of pure metal do not have self-lubricity, which easily leads to problems such as friction, wear, large noise and vibration during transmission, relatively poor transmission efficiency and service life, inability to reflect heavy and vibration-absorbing performance and buffering effect, poor flexibility in the design process, and lack of economy and cheapness.

[0005] In view of the above existing technologies, it is very necessary to make efforts to improve. The technical solution to be introduced below was generated under this background. Summary of the Utility Model

[0006] The primary task of the present utility model is to provide a car seat height adjustment device that helps reduce the number of transmission stages between the automatic power input and output, simplifies the structure, reduces weight, reasonably reduces the volume, improves transmission efficiency, reduces noise and vibration, and reduces the failure rate.

[0007] Another task of the present utility model is to provide a car seat height adjustment device that is beneficial to abandoning the sliding fit between transmission components, avoiding severe wear between components, increasing the service life of components, improving transmission efficiency, saving energy consumption, further reducing noise and vibration, and improving the cooperation precision and stability between components.

[0008] Another task of the present utility model is to provide a car seat height adjustment device that is conducive to significantly improving the reasonable cooperation effect between the secondary transmission mechanism and the primary transmission mechanism, further reflecting the compactness of the overall structure and the miniaturization of the volume, fully ensuring ideal transmission efficiency, increasing the load and transmission ratio, and having excellent transmission precision and reliability.

[0009] Another task of the utility model is to provide a car seat height adjustment device which is convenient for avoiding blind selection of materials for related transmission components and can achieve a good balance between ensuring strength and durability and embodying self-lubricating property, reducing noise, reducing wear and vibration, reducing weight, and embodying vibration absorbing performance and buffering effect.

[0010] In order to embody the primary task of completing the present invention, the present invention provides a technical solution: a vehicle seat height adjustment device, comprising a drive motor, a shell and a seat fixing connecting plate, a worm seat extending from the lower part of the shell, a worm seat cavity of the worm seat communicating with the shell cavity of the shell, a shell cavity opening of the shell cavity facing the seat fixing connecting plate, a drive motor is fixed to the shell at a position corresponding to the worm seat, and a drive motor shaft of the drive motor extends into the worm seat cavity, the seat fixing connecting plate is fixed to the shell at a position corresponding to one side of the shell cavity opening, a gear seat cavity is formed in the middle of the seat fixing connecting plate, and the gear seat cavity A drive wheel clearance hole communicating with the outside is formed at the central position on the left side; a transmission device, characterized in that: the transmission device includes a primary transmission mechanism, a secondary transmission mechanism and a tertiary transmission mechanism, the primary transmission mechanism is arranged in the shell cavity and is connected to the drive motor shaft in the worm seat cavity, the secondary transmission mechanism is arranged in the shell cavity at a position corresponding to the left side of the primary transmission mechanism and is matched with the primary transmission mechanism, the tertiary transmission mechanism is arranged in the drive wheel clearance hole at a position corresponding to the left side of the secondary transmission mechanism, and the right side of the tertiary transmission mechanism is matched with the secondary transmission mechanism, and the drive wheel clearance hole is protruded from the left side.

[0011] To achieve another object of the present utility model, the technical solution provided by the present utility model is as follows: The primary transmission mechanism includes a worm, a worm wheel, a sun gear, and a sun gear shaft. The worm is directly formed on the driving motor shaft within the worm seat cavity or has one end fixedly connected to the front end of the driving motor shaft as an independent component, while the other end is rotatably supported on the front cavity wall of the worm seat cavity. The middle of the worm meshes with the worm wheel, which is rotatably arranged within the housing cavity and has a worm wheel center hole formed at its central position. The worm wheel center hole is sleeved loosely on the sun gear shaft. A sun gear envelope flange is formed on the side of the sun gear facing the worm wheel, and this sun gear envelope flange is fixedly enclosed by the worm wheel. A sun gear center hole that penetrates from the left side to the right side of the sun gear and communicates with the worm wheel center hole is formed at the axial center position of the sun gear. The sun gear center hole is sleeved on the sun gear shaft. The right end of the sun gear shaft is fixedly connected to a sun gear shaft fixing seat at the central position of the bottom wall of the housing cavity. The right end of the sun gear shaft passes through the worm wheel center hole and the sun gear center hole in sequence and extends to the tertiary transmission mechanism. The secondary transmission mechanism is in meshing transmission cooperation with the sun gear and is also limited between the seat fixing connecting plate and the housing.

[0012] To achieve yet another object of the present utility model, the technical solution provided by the present utility model is as follows: The secondary transmission mechanism includes an internal gear ring, a first planetary gear, a second planetary gear, and a third planetary gear. At the edge portion of the internal gear ring, an internal gear ring first limiting ear, an internal gear ring second limiting ear, and an internal gear ring third limiting ear extend at intervals. When the seat fixing connecting plate is fixed to the housing, the internal gear ring is limited between the seat fixing connecting plate and the housing through the internal gear ring first limiting ear, the internal gear ring second limiting ear, and the internal gear ring third limiting ear. An internal gear ring is formed on the cavity wall of the internal gear ring planetary gear cavity of the internal gear ring. The central region of the internal gear ring planetary gear cavity corresponds to the sun gear. The first planetary gear, the second planetary gear, and the third planetary gear are arranged at intervals of 120° in the circumferential direction around the internal gear ring planetary gear cavity and each mesh with the sun gear and the internal gear ring. The tertiary transmission mechanism cooperates with the first planetary gear, the second planetary gear, and the third planetary gear simultaneously.

[0013] In a specific embodiment of the present invention, the three-stage transmission mechanism includes an output gear seat, an output gear and a support plate. A planetary gear matching shaft head is extended on the right side of the output gear seat and at positions corresponding to the first planetary gear, the second planetary gear and the third planetary gear. The planetary gear matching shaft head is matched with the first planetary gear, the second planetary gear and the third planetary gear, and the first planetary gear, the second planetary gear and the third planetary gear drive the output gear seat through the planetary gear matching shaft head. The output gear is formed on the left side of the output gear seat, and a toothless transition section is formed between the output gear and the left side surface of the output gear seat, and on the left side of the output gear A supporting shaft head extends to the left from the central position of the surface, and the output gear together with the supporting shaft head extends to the outside of the drive wheel clearance hole through the gear seat cavity of the seat fixing connecting plate. In use, the output gear is transmission-connected to the height adjustment mechanism arranged in the car seat, and the supporting shaft head is rotatably supported on the seat. The support plate is wrapped around the output gear seat and a toothless transition section sheath is extended from the left central part of the support plate. The toothless transition section sheath is wrapped around the outer wall of the toothless transition section. An output gear seat sheath is extended on the right side of the support plate and at the edge corresponding to the right side surface of the output gear seat, and the left side of the support plate abuts against the top wall of the gear seat cavity.

[0014] In order to embody another task of the utility model, the technical solution provided by the utility model is: the worm wheel is a plastic worm wheel molded by plastic, and is formed with a plastic enveloping step sleeve. When the worm wheel is molded by plastic, the sun gear enveloping flange of the sun gear is enveloped by the plastic enveloping step sleeve so that the sun gear enveloping flange together with the sun gear constitutes an integral structure inseparable from the worm wheel; the support plate is a plastic support plate molded by plastic, and the toothless transition section enveloping sleeve and the output gear seat enveloping edge are integrally molded when the support plate is molded by plastic, and at the same time, the output gear seat and the toothless transition section constitute an integral structure inseparable from the support plate and the toothless transition section enveloping sleeve respectively.

[0015] In another specific embodiment of the present utility model, the drive motor is fixed to the housing in a horizontal cantilever state at a position corresponding to the worm seat. Among them, at one end of the drive motor housing of the drive motor facing the worm seat and spaced along the circumferential direction of the drive motor housing, there are formed drive motor housing fastening claws. The drive motor housing fastening claws are fastened to the worm seat at a position corresponding to the worm seat to achieve fixation with the housing. The grooves between every two adjacent drive motor housing fastening claws are compensated and fixed by the groove compensation feet formed on the left side of the housing. A drive motor power connection socket is provided on the outer wall of the drive motor, and the drive motor is a DC motor with forward and reverse functions, and the DC motor is a brushed DC motor or a brushless DC motor; the housing together with the worm seat and the groove compensation feet are integrally molded by plastic.

[0016] In yet another specific embodiment of the present utility model, a sun gear shaft insertion hole is formed at the central position of the sun gear shaft fixing seat. The sun gear shaft insertion hole is a blind hole with an opening facing left; the sun gear shaft is a stepped shaft having a first section, a second section, and a third section. Among them, the diameter of the first section is greater than that of the second section, and the diameter of the second section is greater than that of the third section. The first section is inserted and fixed in the sun gear shaft insertion hole, the sun gear center hole is rotatably sleeved on the second section, and a sun gear shaft hollow hole is opened at the central position of the output gear seat. The sun gear shaft hollow hole extends leftward to the toothless transition section and is rotatably sleeved on the third section.

[0017] In still another specific embodiment of the present utility model, on the outer wall of the housing on the side facing the seat fixing connecting plate and spaced 180° from each other along the circumferential direction of the housing, a pair of internal gear ring embedding foot cavities are formed. And on the outer wall of the internal gear ring and at positions corresponding to the pair of internal gear ring embedding foot cavities, a pair of internal gear ring embedding feet are formed. The pair of internal gear ring embedding feet are fitted with the pair of internal gear ring embedding foot cavities.

[0018] In still another specific embodiment of the present utility model, on the left side of the worm gear and surrounding the worm gear, an internal gear ring resisting stack ring protruding from the left side surface of the worm gear is formed. The internal gear ring resisting stack ring is located outside the plastic envelope stepped sleeve, and the left side surface of the plastic envelope stepped sleeve is in contact with the right side surface of the internal gear ring.

[0019] In a further specific embodiment of the present utility model, a set of housing connection screw holes are provided on the seat fixing connection plate, and housing fixing connection screws are respectively disposed on the set of housing fixing connection screw holes. A first limiting ear screw hole is provided on the first limiting ear of the internal gear ring, a second limiting ear screw hole is provided on the second limiting ear of the internal gear ring, and a third limiting ear screw hole is provided on the third limiting ear of the internal gear ring. On the outer wall of the housing and at positions corresponding to the housing fixing connection screws, housing fixing connection screw seats are formed. An axially central screw mating threaded hole is formed in the housing fixing connection screw seat. The housing fixing connection screws respectively pass through the first, second, and third limiting ear screw holes and are screwed into the screw mating threaded hole to fix the seat fixing connection plate to the housing, and at the same time, the internal gear ring is limited between the right side surface of the seat fixing connection plate and the left side surface of the housing. A pair of anti-rotation fitting foot holes are provided on the seat fixing connection plate, and a pair of anti-rotation fitting feet extend at positions corresponding to the anti-rotation fitting foot holes at the opening of the housing cavity of the housing. The anti-rotation fitting feet are inserted into the pair of anti-rotation fitting foot holes. Seat fixing wings are respectively folded and extended on the left and right sides of the seat fixing connection plate, and seat fixing wing fixing holes are provided on the seat fixing wings. In the use state, the seat fixing wing fixing holes are fixed to the seat through fasteners at positions corresponding to the height adjustment mechanism in the vehicle seat.

[0020] One of the technical effects of the technical solution provided by the present utility model is that, since a first-stage, a second-stage, and a third-stage transmission mechanism are adopted in the structural system of the transmission device, the number of transmission stages between the power input of the driving motor as the power source and the third-stage transmission mechanism as the power output is reduced compared with the prior art, thereby simplifying the structure, reducing the weight, reasonably reducing the volume, improving the transmission efficiency, reducing the noise and vibration, and reducing the probability of failure; second, since there is no sliding fit between the first-stage transmission mechanism and the second-stage transmission mechanism, and between the second-stage transmission mechanism and the third-stage transmission mechanism, there is no severe wear between the transmission components, thereby improving the service life of the components, improving the transmission efficiency, reducing the energy consumption, further reducing the noise and vibration, and improving the fitting accuracy and stability between the components; third, since the structural system of the second-stage transmission mechanism uses the first, second, and third planetary gears driven by the sun gear of the first-stage transmission mechanism and meshing with the sun gear together, the reasonable matching effect between the second-stage transmission mechanism and the first-stage transmission mechanism is significantly improved, further reflecting the compactness of the structure and the miniaturization of the volume, fully ensuring the ideal transmission efficiency, increasing the load and the transmission ratio, and reflecting the ultimate transmission accuracy and transmission reliability; fourth, since the worm wheel in the first-stage transmission mechanism and the support disk in the third-stage transmission mechanism are respectively formed by plastic molding, and the sun gear envelope flange of the sun gear is enveloped by the plastic envelope step sleeve of the worm wheel, and the output gear seat and the toothless transition section are enveloped by the support disk, the selection of the materials of the relevant transmission components is avoided blindly, and a good balance effect among ensuring the strength and durability of the transmission components, reflecting the self-lubrication, reducing the noise, avoiding the friction damage of the components, reducing the overall weight, improving the vibration absorption performance, and improving the anti-impact buffering, etc. can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of an embodiment of the present utility model;

[0022] Figure 2 is Figure 1 A cross-sectional view after assembly. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] In order to be able to more clearly understand the technical essence and beneficial effects of the present utility model, the applicant will make a detailed description in the following in the form of embodiments. However, the description of the embodiments is not a limitation on the technical solution of the present utility model. Any equivalent transformation that is merely formal rather than substantial based on the concept of the present utility model should be regarded as falling within the scope of the technical solution of the present utility model.

[0024] In the following description, any concepts related to the directionality or orientation such as up, down, left, right, front, and back are based on the current position state shown by Figure 1 Therefore, it cannot be understood as a special limitation on the technical solution provided by the present utility model.

[0025] Please refer to Figure 1 and Figure 2 which shows a drive motor 1, a housing 2 and a seat fixing connecting plate 3. A worm seat 21 extends from the lower part of the housing 2. The worm seat cavity 211 of the worm seat 21 communicates with the housing cavity 22 of the housing 2. The housing cavity opening 221 of the housing cavity 22 faces the seat fixing connecting plate 3. The drive motor 1 is fixed to the housing 2 at a position corresponding to the aforementioned worm seat 21, and the drive motor shaft 11 of the drive motor 1 extends into the aforementioned worm seat cavity 211. The seat fixing connecting plate 3 is fixed to the aforementioned housing 2 at a position on one side corresponding to the aforementioned housing cavity opening 221. A gear seat cavity 31 ( Figure 2 detailed illustration) is formed in the middle of the seat fixing connecting plate 3. A drive wheel relief hole 311 communicating with the outside is formed at the central position on the left side of the gear seat cavity 31; a transmission device 4 is shown. As the technical key point of the technical solution provided by the present invention: the aforementioned transmission device 4 includes a first-stage transmission mechanism 41, a second-stage transmission mechanism 42 and a third-stage transmission mechanism 43. The first-stage transmission mechanism 41 is arranged in the aforementioned housing cavity 22 and is in transmission connection with the aforementioned drive motor shaft 11 in the aforementioned worm seat cavity 211. The second-stage transmission mechanism 42 is arranged in the housing cavity 22 at a position corresponding to the left side of the first-stage transmission mechanism 41 and is in transmission cooperation with the aforementioned first-stage transmission mechanism 41. The third-stage transmission mechanism 43 is arranged in the aforementioned drive wheel relief hole 311 at a position corresponding to the left side of the second-stage transmission mechanism 42, and the right side of the third-stage transmission mechanism 43 is matched with the aforementioned second-stage transmission mechanism 42, and the left side protrudes out of the aforementioned drive wheel relief hole 311.

[0026] It can be seen from the above description that since the transmission mechanisms of the structural system of the transmission device 4 of the present invention adopt the first-stage, second-stage and third-stage transmission mechanisms 41, 42, 43, one transmission mechanism is reduced compared with the four-stage transmission design mode that is to a certain extent affected by traditional design concepts, that is, the generally recognized four-stage transmission is changed to a three-stage transmission, thus faithfully realizing many corresponding technical effects among the technical effects mentioned by the applicant above.

[0027] Continue to see Figure 1 and Figure 2 The aforementioned first-stage transmission mechanism 41 includes a worm 411, a worm wheel 412, a sun gear 413 and a sun gear shaft 414. In this embodiment, the aforementioned worm 411 is directly formed on the aforementioned drive motor shaft 11 in the aforementioned worm seat cavity 211. Since the worm 411 is directly formed on the aforementioned drive motor shaft 11 in this embodiment, the end of the drive motor shaft 11 is namely Figure 1The front end of the shown position state is rotatably supported on a support bearing 212 provided on the front cavity wall of a worm seat cavity 211 where a worm seat 21 is provided. The worm 411 meshes with a worm wheel 412. The worm wheel 412 is rotatably provided in the aforementioned housing cavity 22, and a worm wheel center hole 4121 is provided at the central position of the worm wheel 412 ( Figure 2 as shown). The worm wheel center hole 4121 is sleeved on a sun gear shaft 414 in a clearance fit. On the side of the sun gear 413 facing the worm wheel 412, a sun gear enveloping flange 4131 is formed. The sun gear enveloping flange 4131 is enveloped and fixed by the aforementioned worm wheel 412. At the axial central position of the sun gear 413, a sun gear center hole 4132 is formed, which penetrates from the left side to the right side of the sun gear 413 and communicates with the aforementioned worm wheel center hole 4121. The sun gear center hole 4132 is rotatably sleeved on the aforementioned sun gear shaft 414. The right end of the sun gear shaft 414 is fixed to a sun gear shaft fixing seat 2221 at the central position of the bottom wall 222 ( Figure 2 marked) of the housing cavity 22. The right end of the sun gear shaft 414 passes through the aforementioned worm wheel center hole 4121 and sun gear center hole 4132 in sequence and extends to the aforementioned three-stage transmission mechanism 43. The aforementioned two-stage transmission mechanism 42 is in meshing transmission cooperation with the aforementioned sun gear 413, and the two-stage transmission mechanism 42 is also defined between the aforementioned seat fixing connecting plate 3 and the aforementioned housing 2.

[0028] As another implementation manner, the aforementioned worm 411 can be configured as an independent component, and one end of the worm 411 of the independent component is fixedly connected to the aforementioned end (i.e., "front end") of the drive motor shaft 11. The fixed connection manner preferably adopts key fixation. Of course, a coupling or other equivalent manner can also be used for connection. The other end of the worm 411, i.e., the front end, is rotatably supported on a support bearing 212 provided on the front cavity wall of the aforementioned worm seat cavity 211, and the middle part (the worm thread in the middle) of the worm 411 meshes with the worm wheel 412.

[0029] As can be seen from the above description, since the two-stage transmission mechanism 42 is in meshing transmission cooperation with the sun gear 413, there is no sliding fit situation in the prior art, thus objectively verifying the various advantages involved in the second technical effect in the technical effect column of the applicant above.

[0030] Continue to see Figure 1 and Figure 2, the aforementioned secondary transmission mechanism 42 includes an internal gear ring 421, a first planetary gear 422, a second planetary gear 423, and a third planetary gear 424. At the edge of the internal gear ring 421, an internal gear ring first limiting ear 4211, an internal gear ring second limiting ear 4212, and an internal gear ring third limiting ear 4213 extend at intervals. When the aforementioned seat fixing connecting plate 3 is fixed to the aforementioned housing 2, the internal gear ring 421 is limited between the aforementioned seat fixing connecting plate 3 and the aforementioned housing 2 through the internal gear ring first limiting ear 4211, the internal gear ring second limiting ear 4212, and the internal gear ring third limiting ear 4213. On the inner wall of the internal gear ring planetary gear cavity 4214 of the internal gear ring 421, an internal gear ring 42141 is formed. The central region of the internal gear ring planetary gear cavity 4214 corresponds to the aforementioned sun gear 413. That is to say, the aforementioned sun gear 413 is located at the central position of the internal gear ring planetary gear cavity 4214. The first planetary gear 422, the second planetary gear 423, and the third planetary gear 424 are arranged at intervals of 120° in the circumferential direction around the internal gear ring planetary gear cavity 4214 and are respectively meshed with the aforementioned sun gear 413 and the internal gear ring 42141; the aforementioned tertiary transmission mechanism 43 is simultaneously engaged with the first planetary gear 422, the second planetary gear 423, and the third planetary gear 424.

[0031] As can be seen from the content of the previous paragraph, in the present utility model, since three planetary gears are adopted for the secondary transmission mechanism 42, namely the first planetary gear 422, the second planetary gear 423, and the third planetary gear 424, and these three planetary gears are simultaneously meshed with the sun gear 413 and the internal gear ring 42141, the third technical effect mentioned by the applicant in the technical effect column above is thus faithfully achieved.

[0032] Continue to see Figure 1 and Figure 2, the aforementioned three-stage transmission mechanism 43 includes an output gear seat 431, an output gear 432, and a support disk 433. On the right side of the output gear seat 431 and at positions corresponding to the aforementioned first planetary gear 422, second planetary gear 423, and third planetary gear 424, there extend planetary gear mating shaft heads 4311 respectively. Since a first shaft head mating hole 4221 is provided in the center of the aforementioned first planetary gear 422, a second shaft head mating hole 4231 is provided in the center of the second planetary gear 423, and a third shaft head mating hole 4241 is provided in the center of the third planetary gear 424, there are three planetary gear mating shaft heads 4311 shown in the figure. The three planetary gear mating shaft heads 4311 respectively cooperate with the first shaft head mating hole 4221 of the first planetary gear 422, the second shaft head mating hole 4231 of the second planetary gear 423, and the third shaft head mating hole 4241 of the third planetary gear 424. And at the same time, the first planetary gear 422, second planetary gear 423, and third planetary gear 424 drive the output gear seat 431 through the planetary gear mating shaft heads 4311. The output gear 432 is formed on the left side of the output gear seat 431, and a toothless transition section 4321 (also called "smooth column section") is formed between the output gear 432 and the left side surface of the output gear seat 431. And at the central position of the left side surface of the output gear 432, a support shaft head 4322 extends leftward. The output gear 432 together with the support shaft head 4322 extends through the gear seat cavity 31 of the aforementioned seat fixing connecting plate 3 to the outside of the aforementioned drive wheel relief hole 311. In the use state, the aforementioned output gear 432 is in transmission connection with the height adjustment mechanism provided in the vehicle seat, and the aforementioned support shaft head 4322 is rotatably supported on the seat. The support disk 433 envelopes the aforementioned output gear seat 431, and a toothless transition section sheath 4331 extends from the central part on the left side of the support disk 433. The toothless transition section sheath 4331 envelopes the outer wall of the aforementioned toothless transition section 4321. On the right side of the support disk 433 and at the edge part corresponding to the right side surface of the output gear seat 431, an output gear seat envelope edge 4332 extends. The left side of the support disk 433 abuts against the top wall of the aforementioned gear seat cavity 31.

[0033] Continue to see Figure 1 and Figure 2, the aforementioned worm gear 412 is a plastic worm gear formed by plastic molding, and is provided with a plastic envelope step sleeve 4122. While the worm gear 412 is formed by plastic molding, the sun gear envelope flange 4131 of the aforementioned sun gear 413 is enveloped by the plastic envelope step sleeve 4122, so that the sun gear envelope flange 4131 together with the aforementioned sun gear 413 forms an inseparable integral structure with the worm gear 412; the aforementioned support disk 433 is a plastic support disk formed by plastic molding, and the toothless transition section sheath 4331 and the output gear seat envelope edge 4332 are integrally formed when the support disk 433 is formed by plastic molding, and while being integrally formed, the aforementioned output gear seat 431 and the toothless transition section 4321 are respectively formed into inseparable integral structures with the support disk 433 and the toothless transition section sheath 4331.

[0034] As can be seen from the above description, since the worm gear 412 in the structural system of the first transmission mechanism 41 and the support disk 433 in the structural system of the third transmission mechanism 43 are formed by plastic molding, the fourth technical effect described by the applicant in the above technical effect column is objectively realized.

[0035] Continue to see Figure 1 and Figure 2 , still taking the Figure 1 position state as an example, the aforementioned driving motor 1 is fixed to the aforementioned housing 2 in a horizontal cantilever state at a position corresponding to the rear side of the aforementioned worm gear seat 21. Among them, at one end of the driving motor housing of the driving motor 1 facing the aforementioned worm gear seat 21 and at intervals around the circumferential direction of the driving motor housing, there are driving motor housing fastening fixing claws 12, and the driving motor housing fastening fixing claws 12 are fastened to the worm gear seat 21 at the position corresponding to the worm gear seat 21 to achieve fixation with the aforementioned housing 2. The groove 121 between two adjacent driving motor housing fastening fixing claws 12 is compensated and fixed by the groove compensation insert foot 23 formed on the left side of the housing 2. A driving motor power connection socket 13 is provided on the outer wall of the driving motor 1, and the driving motor 1 is a DC motor with a forward and reverse function.

[0036] In this embodiment, the aforementioned DC motor is a brushed DC motor. However, if a brushless DC motor is used to replace the brushed DC motor in the form of transformation, it should be regarded as equivalent; the aforementioned housing 2 together with the aforementioned worm gear seat 21 and the aforementioned groove compensation insert foot 23 are integrally formed by plastic molding.

[0037] At the central position of the aforementioned sun gear shaft fixing seat 2221, there is formed a sun gear shaft insertion hole 22211 ( Figure 2As shown, the sun gear shaft insertion hole 22211 is a blind hole with an opening facing left; the aforementioned sun gear shaft 414 is a stepped shaft having a first section 4141, a second section 4142, and a third section 4143. Among them, the diameter of the first section 4141 is greater than that of the second section 4142, and the diameter of the second section 4142 is greater than that of the third section 4143. The middle part and the right end of the aforementioned first section 4141 are inserted and fixed in the aforementioned sun gear shaft insertion hole 22211, and the left end of the first section 4141 protrudes from the left side surface of the sun gear shaft fixing seat 2221. And the aforementioned worm wheel center hole 4121 corresponds to the left end of the first section 4141. The aforementioned sun gear center hole 4132 is rotatably sleeved on the aforementioned second section 4142. A sun gear shaft clearance hole 4312 is provided at the center position of the aforementioned output gear seat 431 ( Figure 2 As shown, the sun gear shaft clearance hole 4312 extends leftward to the aforementioned toothless transition section 4321 and is rotatably sleeved on the aforementioned third section 4143.

[0038] On the outer wall of the aforementioned housing 2 on the side facing the aforementioned seat fixing connecting plate 3 and in a state of being spaced 180° from each other around the circumference of the housing 2, a pair of internal gear ring embedding foot cavities 24 are formed. And on the outer wall of the aforementioned internal gear ring 421 and at positions corresponding to the pair of internal gear ring embedding foot cavities 24, a pair of internal gear ring embedding feet 4215 are formed. The pair of internal gear ring embedding feet 4215 are fitted with the pair of internal gear ring embedding foot cavities 24.

[0039] Continue to see Figure 1 Figure 2 , on the left side of the aforementioned worm wheel 412 and around the circumference of the worm wheel 412, an internal gear ring resisting stack ring 4123 protruding from the left side surface of the worm wheel 412 is formed. The internal gear ring resisting stack ring 4123 is located outside the aforementioned plastic envelope stepped sleeve 4122, and the left side surface of the plastic envelope stepped sleeve 4122 contacts the right side surface of the aforementioned internal gear ring 421.

[0040] A set of housing connection screw holes 32 are provided in the aforesaid seat fixing connection plate 3, and housing fixing connection screws 321 are respectively arranged on the set of housing fixing connection screw holes 32. A first limiting ear screw hole 42111 is provided in the aforesaid first limiting ear 4211 of the internal gear ring, a second limiting ear screw hole 42121 is provided in the aforesaid second limiting ear 4212 of the internal gear ring, and a third limiting ear screw hole 42131 is provided in the aforesaid third limiting ear 4213 of the internal gear ring. On the outer wall of the aforesaid housing 2 and at a position corresponding to the aforesaid housing fixing connection screw 321, a housing fixing connection screw seat 25 is formed. An axially central screw mating threaded hole 251 is formed in the housing fixing connection screw seat 25. The aforesaid housing fixing connection screws 321 respectively pass through the first, second, and third limiting ear screw holes 42111, 42121, 42131 and are screwed into the aforesaid screw mating threaded hole 251 to fix the seat fixing connection plate 3 to the housing 2, and at the same time limit the aforesaid internal gear ring 421 between the right side surface of the seat fixing connection plate 3 and the left side surface of the housing 2; A pair of anti-rotation fitting holes 33 are provided in the seat fixing connection plate 3, and a pair of anti-rotation fittings 26 extend at the position of the cavity opening 221 of the housing cavity of the aforesaid housing 2 and at a position corresponding to the anti-rotation fitting holes 33. The anti-rotation fittings 26 are inserted into the pair of anti-rotation fitting holes 33; Seat fixing wings 34 are respectively folded and extended on the left and right sides of the seat fixing connection plate 3. Seat fixing wing fixing holes 341 are provided in the seat fixing wings 34. In the use state, the seat fixing wing fixing holes 341 are fixed to the seat by fasteners at positions corresponding to the height adjustment mechanism in the vehicle seat.

[0041] Preferably, before screwing the seat fixing connection plate 3 with the screw mating threaded hole 251 of the aforesaid housing fixing connection seat 25 through the aforesaid housing fixing connection screw 321, gear grease (i.e., "gear lubricating grease") is applied to the aforesaid first, second, and third planetary gears 422, 423, 424 and the sun gear 413.

[0042] Preferably, on the left side of the aforesaid support disc 433 and at a position surrounding the periphery of the toothless transition section sheath 4331, a pair of fixing wing abutting stacks 4333 protruding from the left side surface of the support disc 433 are formed. The left side surfaces of the pair of fixing wing abutting stacks 4333 are in abutting contact with the right side surfaces of the aforesaid seat fixing wings 34.

[0043] The applicant combines Figure 1 and Figure 2To describe the operation process of the present utility model, it is first necessary to clarify that: under normal circumstances, the operation control switch of the vehicle seat height adjustment device is usually set on the side of the seat, and the operation control switch has manual adjustment and automatic adjustment. Although the control methods of manual adjustment and automatic adjustment are different, their functions and principles are the same. If it is manual adjustment, the seat height is adjusted by a wrench or a knob; if it is automatic adjustment, the seat height is adjusted by a button. Taking the driver's seat as an example, the adjustment principle is to adjust it to ensure an appropriate distance between the line of sight and the instrument panel, be able to easily reach the pedal, and keep the knees and feet naturally bent, so as to improve driving comfort and safety.

[0044] If the vehicle seat is to be raised, then by operating the control switch for the above-mentioned manual or automatic adjustment, the driving motor 1 works clockwise. The worm 411 of the structural system of the first-stage transmission mechanism 41 is driven by the driving motor shaft 11. The worm 411 drives the worm gear 412 meshing with it, and the worm gear 412 drives the sun gear 413. Since the second-stage transmission mechanism 42 is in transmission cooperation with the sun gear 413 of the first-stage transmission mechanism 41, during the process that the aforementioned worm gear 412 drives the sun gear 413 to rotate through the sun gear envelope flange 4131, the sun gear 413 simultaneously drives the first planetary gear 422, the second planetary gear 423 and the third planetary gear 424, so that the first, second and third planetary gears 422, 423, 424 move around the internal gear ring 42141. Since the third-stage transmission mechanism 43 is in cooperation with the second-stage transmission mechanism 42, specifically: the three planetary gear mating shaft heads 4311 on the right side of the output gear seat 431 of the structural system of the third-stage transmission mechanism 43 are respectively placed into the first shaft head mating hole 4221 of the first planetary gear 422, the second shaft head mating hole 4231 of the second planetary gear 423 and the third shaft head mating hole 4241 of the third planetary gear 424. Therefore, while the first, second and third planetary gears 422, 423, 424 rotate around the aforementioned internal gear ring 42141, they drive the output gear seat 431, and thus the output gear seat 431 drives the output gear 432 which is integrally structured with it. The output gear 432 drives the height adjustment mechanism in the vehicle seat, that is, the height adjustment mechanism in the aforementioned vehicle seat, so that the vehicle seat rises to the required level and basically meets the aforementioned requirements. Since the process of reverse adjustment of the vehicle seat, that is, lowering adjustment, is opposite to the aforementioned raising adjustment process, specifically: as long as the control switch for manual or automatic adjustment is operated in the reverse direction relative to the aforementioned operation to make the driving motor 1 work counterclockwise, it can be achieved. Therefore, the applicant will not elaborate further.

[0045] In summary, the technical solution provided by the present utility model makes up for the deficiencies in the prior art, successfully completes the invention task, and faithfully realizes the technical effects described by the applicant in the above technical effect column.

Claims

1. A vehicle seat height adjustment device, comprising a drive motor (1), a housing (2) and a seat fixing connecting plate (3), wherein a worm seat (21) extends from the lower part of the housing (2), a worm seat cavity (211) of the worm seat (21) communicates with a housing cavity (22) of the housing (2), a housing cavity opening (221) of the housing cavity (22) faces the seat fixing connecting plate (3), and the drive motor (1) is fixed to the housing (2) at a position corresponding to the worm seat (21). The drive motor shaft (11) of the drive motor (1) extends into the worm seat cavity (211), the seat fixing connecting plate (3) is fixed to the housing (2) at a position corresponding to one side of the housing cavity opening (221), a gear seat cavity (31) is formed in the middle of the seat fixing connecting plate (3), and a drive wheel clearance hole (311) communicating with the outside is formed at the central position of the left side of the gear seat cavity (31); a transmission device (4), characterized in that: The described transmission device (4) includes a primary transmission mechanism (41), a secondary transmission mechanism (42), and a tertiary transmission mechanism (43). The primary transmission mechanism (41) is disposed within the housing cavity (22) and is in driving connection with the drive motor shaft (11) within the worm seat cavity (211). The secondary transmission mechanism (42) is disposed within the housing cavity (22) at a position corresponding to the left side of the primary transmission mechanism (41) and is in driving cooperation with the primary transmission mechanism (41). The tertiary transmission mechanism (43) is disposed within the drive wheel relief hole (311) at a position corresponding to the left side of the secondary transmission mechanism (42), and the right side of the tertiary transmission mechanism (43) cooperates with the secondary transmission mechanism (42), while the left side extends out of the drive wheel relief hole (311).

2. The vehicle seat height adjustment device according to claim 1, characterized in that: The described primary transmission mechanism (41) includes a worm (411), a worm wheel (412), a sun gear (413), and a sun gear shaft (414). The worm (411) is directly formed on the drive motor shaft (11) within the worm seat cavity (211) or has one end fixedly connected to the front end of the drive motor shaft (11) as an independent component, and the other end is rotatably supported on the front cavity wall of the worm seat cavity (211). The middle of the worm (411) meshes with the worm wheel (412). The worm wheel (412) is rotatably disposed within the housing cavity (22), and a worm wheel center hole (4121) is provided at the central position of the worm wheel (412). The worm wheel center hole (4121) is sleeved on the sun gear shaft (414). One side of the sun gear (413) facing the worm wheel (412) is formed with a sun gear envelope flange (4131), and the sun gear envelope flange (4131) is fixedly enveloped by the worm wheel (412). A sun gear center hole (4132) that penetrates from the left side to the right side of the sun gear (413) and communicates with the worm wheel center hole (4121) is formed at the axial center of the sun gear (413). The sun gear center hole (4132) is sleeved on the sun gear shaft (414). The right end of the sun gear shaft (414) is fixed to the sun gear shaft fixing seat (2221) at the central position of the bottom wall (222) of the housing cavity (22). The right end of the sun gear shaft (414) passes through the worm wheel center hole (4121) and the sun gear center hole (4132) in sequence and extends to the tertiary transmission mechanism (43). The secondary transmission mechanism (42) is in driving cooperation with the sun gear (413) in a meshing manner, and the secondary transmission mechanism (42) is also limited between the seat fixing connecting plate (3) and the housing (2).

3. The vehicle seat height adjustment device according to claim 2, wherein: The described secondary transmission mechanism (42) includes an internal gear ring (421), a first planetary gear (422), a second planetary gear (423), and a third planetary gear (424). At the edge of the internal gear ring (421), an internal gear ring first limiting ear (4211), an internal gear ring second limiting ear (4212), and an internal gear ring third limiting ear (4213) extend at intervals. When the seat fixing connection plate (3) is fixed to the housing (2), the internal gear ring (421) is limited between the seat fixing connection plate (3) and the housing (2) through the internal gear ring first limiting ear (4211), the internal gear ring second limiting ear (4212), and the internal gear ring third limiting ear (4213). On the cavity wall of the internal gear ring planetary gear cavity (4214) of the internal gear ring (421), an internal gear ring (42141) is formed. The central area of the internal gear ring planetary gear cavity (4214) corresponds to the sun gear (413). The first planetary gear (422), the second planetary gear (423), and the third planetary gear (424) are arranged at intervals of 120° in the circumferential direction around the internal gear ring planetary gear cavity (4214) and each mesh with the sun gear (413) and the internal gear ring (42141). The tertiary transmission mechanism (43) cooperates with the first planetary gear (422), the second planetary gear (423), and the third planetary gear (424) simultaneously.

4. The vehicle seat height adjustment device according to claim 3, characterized in that: The three-stage transmission mechanism (43) comprises an output gear seat (431), an output gear (432) and a support plate (433). A planetary gear matching shaft head (4311) is extended on the right side of the output gear seat (431) and at positions corresponding to the first planetary gear (422), the second planetary gear (423) and the third planetary gear (424). The planetary gear matching shaft head (4311) is connected to the first planetary gear (422), the second planetary gear (423) and the third planetary gear (424). ) and the third planetary gear (424) are matched and the first planetary gear (422), the second planetary gear (423) and the third planetary gear (424) drive the output gear seat (431) through the planetary gear matching shaft head (4311), the output gear (432) is formed on the left side of the output gear seat (431), and a toothless transition section (4321) is formed between the output gear (432) and the left side surface of the output gear seat (431), and the output gear (432) is connected to the output gear seat (431). ) is provided with a support shaft head (4322) extending to the left from the central position of the left side of the seat, and the output gear (432) together with the support shaft head (4322) extends to the outside of the drive wheel clearance hole (311) through the gear seat cavity (31) of the seat fixing connecting plate (3). In the use state, the output gear (432) is transmission-connected with the height adjustment mechanism arranged in the car seat, and the support shaft head (4322) is rotatably supported on the seat, and the support plate (433) is enclosed in the output gear (432). A toothless transition section sheath (4331) is extended from the gear seat (431) and the left central portion of the support plate (433). The toothless transition section sheath (4331) is wrapped around the outer wall of the toothless transition section (4321). An output gear seat sheath edge (4332) is extended on the right side of the support plate (433) and at the edge portion corresponding to the right side surface of the output gear seat (431). The left side of the support plate (433) abuts against the top wall of the gear seat cavity (31).

5. The vehicle seat height adjustment device according to claim 4, characterized in that: The worm wheel (412) is a plastic worm wheel molded by plastic, and is formed with a plastic enveloping step sleeve (4122). When the worm wheel (412) is molded by plastic, the sun gear enveloping flange (4131) of the sun gear (413) is enveloped by the plastic enveloping step sleeve (4122), so that the sun gear enveloping flange (4131) together with the sun gear (413) constitutes an integral structure inseparable from the worm wheel (412); the support plate (433) is a plastic support plate molded by plastic, and the toothless transition section enveloping sleeve (4331) and the output gear seat enveloping edge (4332) are integrally formed when the support plate (433) is molded by plastic, and at the same time, the output gear seat (431) and the toothless transition section (4321) constitute an integral structure inseparable from the support plate (433) and the toothless transition section enveloping sleeve (4331), respectively.

6. The vehicle seat height adjustment device according to claim 1, characterized in that: The described drive motor (1) is fixed to the housing (2) in a horizontally-mounted cantilever state at a position corresponding to the worm seat (21). Among them, at one end of the drive motor housing of the drive motor (1) facing the worm seat (21) and at intervals around the circumferential direction of the drive motor housing, drive motor housing fastening claws (12) are formed. The drive motor housing fastening claws (12) are fastened to the worm seat (21) at a position corresponding to the worm seat (21) to achieve fixation with the housing (2). The grooves (121) between every two adjacent drive motor housing fastening claws (12) are compensated and fixed by the left-side groove compensation feet (23) formed on the housing (2). A drive motor power connection socket (13) is provided on the outer wall of the drive motor (1), and the drive motor (1) is a DC motor with forward and reverse functions, and the DC motor is a brushed DC motor or a brushless DC motor; the housing (2), together with the worm seat (21) and the groove compensation feet (23), is integrally injection-molded from plastic.

7. The vehicle seat height adjustment device according to claim 4, characterized in that: A sun gear shaft insertion and fixation hole (22211) is formed at the central position of the sun gear shaft fixing seat (2221). The sun gear shaft insertion and fixation hole (22211) is a blind hole with an opening facing left; the sun gear shaft (414) is a stepped shaft having a first section (4141), a second section (4142), and a third section (4143). Among them, the diameter of the first section (4141) is larger than the diameter of the second section (4142), and the diameter of the second section (4142) is larger than the diameter of the third section (4143). The first section (4141) is inserted and fixed in the sun gear shaft insertion and fixation hole (22211), and the sun gear center hole (4132) is rotatably sleeved on the second section (4142). A sun gear shaft clearance hole (4312) is provided at the central position of the output gear seat (431). The sun gear shaft clearance hole (4312) extends leftward to the toothless transition section (4321) and is rotatably sleeved on the third section (4143).

8. The vehicle seat height adjustment device according to claim 3, characterized in that: On the outer wall of the housing (2) on the side facing the seat fixing connecting plate (3) and at intervals around the circumferential direction of the housing (2) in a state of being separated from each other by 180°, a pair of internal gear ring embedding foot cavities (24) are formed. On the outer wall of the internal gear ring (421) and at positions corresponding to the pair of internal gear ring embedding foot cavities (24), a pair of internal gear ring embedding feet (4215) are formed. The pair of internal gear ring embedding feet (4215) are fitted with the pair of internal gear ring embedding foot cavities (24).

9. The vehicle seat height adjustment device according to claim 5, characterized in that: On the left side of the worm gear (412) and around the periphery of the worm gear (412), an internal gear ring resisting stack ring (4123) protruding from the left side surface of the worm gear (412) is formed. The internal gear ring resisting stack ring (4123) is located outside the plastic envelope stepped sleeve (4122), and the left side surface of the plastic envelope stepped sleeve (4122) is in contact with the right side surface of the internal gear ring (421).

10. The vehicle seat height adjustment device according to claim 8, wherein: A set of housing connection screw holes (32) are provided in the seat fixing connection plate (3). Housing fixing connection screws (321) are respectively provided on these housing fixing connection screw holes (32). A first limiting ear screw hole (42111) is provided on the first limiting ear (4211) of the internal gear ring. A second limiting ear screw hole (42121) is provided on the second limiting ear (4212) of the internal gear ring. A third limiting ear screw hole (42131) is provided on the third limiting ear (4213) of the internal gear ring. On the outer wall of the housing (2) and at positions corresponding to the housing fixing connection screws (321), housing fixing connection screw seats (25) are formed. An axially central screw mating threaded hole (251) is formed in the housing fixing connection screw seats (25). The housing fixing connection screws (321) respectively pass through the first, second, and third limiting ear screw holes (42111, 42121, 42131) and are screwed into the screw mating threaded hole (251) to fix the seat fixing connection plate (3) to the housing (2), and at the same time, the internal gear ring (421) is limited between the right side surface of the seat fixing connection plate (3) and the left side surface of the housing (2). A pair of anti-rotation embedding foot holes (33) are provided in the seat fixing connection plate (3). At the position of the housing cavity opening (221) of the housing (2) and at positions corresponding to the anti-rotation embedding foot holes (33), a pair of anti-rotation embedding feet (26) extend. The anti-rotation embedding feet (26) are inserted into the pair of anti-rotation embedding foot holes (33). Seat fixing wings (34) are respectively folded and extended on the left and right sides of the seat fixing connection plate (3). Seat fixing wing fixing holes (341) are provided in the seat fixing wings (34). In the use state, the seat fixing wing fixing holes (341) are fixed to the seat through fasteners at positions corresponding to the height adjustment mechanism in the vehicle seat.

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