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 invention belongs to the technical field of automobile parts, and in particular relates to a height adjustment device for an automobile seat. Background Art

[0002] The purpose of car seat height adjustment is to allow passengers to adjust the seat height according to their own needs, such as their height, riding habits and comfort needs, for example, to obtain a desired comfortable and safe posture. Adjusting the height of the car seat can also help reduce fatigue caused by long-term driving and riding. In short, the role of car seat height adjustment includes but is not limited to: improving vision, reducing leg fatigue, optimizing operating convenience, improving comfort, promoting and even ensuring safe driving, etc.

[0003] There is no lack of technical information on car seat adjustment in the public Chinese patent documents. For example, CN208498300U recommends "an electric height adjuster for car seats". This patent shows four-level adjustment, specifically: the first-level transmission is driven by the gear box to drive the eccentric worm gear; the second-level transmission is driven by the eccentric worm gear to drive the slider; the third-level transmission is driven by the slider to drive the ring gear; the fourth-level transmission is driven by the ring gear to drive the output gear assembly. For example, CN110356291A & CN110356292A provide "an electric height adjuster for car seats" & "a seat height adjuster". The four-level adjustment process of these two patents is exactly the same as that of the aforementioned CN208498300U. For example, CN111114398A introduces "an electric height adjustment device for a car seat". The four-stage transmission process of this patent is as follows: the first-stage transmission is that the worm (called "screw" in the patent) drives the reduction gear (essentially a worm wheel); the second-stage transmission is that the reduction gear drives the moving gear; the third-stage transmission is that the moving gear drives the floating plate; the fourth-stage reduction is that the floating plate drives the output shaft (the height adjustment process of the car seat can be found in the last paragraph of the patent specification).

[0004] The following common disadvantages exist in the patents not limited to the above examples: First, since four-stage transmission is required to achieve or claim to achieve the purpose of adjusting the height of the car seat, there are many transmission stages, and the technical problems caused by many transmission stages are complex structure, reduced efficiency, increased noise and vibration, high probability of failure, and increased weight and volume; second, due to the existence of a sliding fit transmission link, the sliding fit will increase wear, shorten the service life of components, reduce transmission efficiency and increase energy consumption, increase noise and vibration, and reduce accuracy and stability. For example, the sliding fit may become loose or fail when subjected to 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, This results in a structure that is not compact, difficult to reduce in size, low transmission efficiency, low load and small transmission ratio, relatively low transmission (i.e. movement) accuracy and reliability, and great functional limitations; fourthly, because metal worm wheels and metal gears are indiscriminately used for transmission parts such as worm wheels and output gears that cooperate with worm transmission, although such pure metal parts have the advantages of high strength and good durability, the transmission parts made of pure metal are not self-lubricating and are prone to friction, wear, noise and vibration during the transmission process, relatively poor transmission efficiency and service life, and the heavy weight, vibration absorption performance and buffering effect cannot be reflected, the flexibility in the design process is poor and it is not economical and cheap.

[0005] In view of the above-mentioned existing technologies, it is necessary to strive for improvement. The technical solution to be introduced below is produced in this context. Summary of the invention

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

[0007] Another task of the present invention is to provide a car seat height adjustment device that is beneficial to abandoning the sliding fit between transmission components to avoid severe wear between components, increase the service life of components, improve transmission efficiency, save energy consumption, further reduce noise and vibration, and improve the fit accuracy and stability between components.

[0008] Another task of the present invention is to provide a car seat height adjustment device which is beneficial to significantly improve the reasonable coordination effect between the secondary transmission mechanism and the primary transmission mechanism, thereby further embodying the compactness of the overall structure and the miniaturization of the volume, fully guaranteeing the ideal transmission efficiency, increasing the load and transmission ratio, and having excellent transmission accuracy and reliability.

[0009] Another task of the present invention is to provide a car seat height adjustment device that is easy to avoid blindly selecting the materials of related transmission components and can achieve a good balance between ensuring strength and durability and embodying self-lubricating properties, reducing noise, reducing wear and vibration, reducing weight, and embodying vibration absorption performance and buffering effects.

[0010] In order to embody the primary task of completing the present invention, the technical solution provided by the present invention is: a car seat height adjustment device, including a driving 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 driving motor is fixed to the shell at a position corresponding to the worm seat, and a driving motor shaft of the driving 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 left side of the gear seat cavity A drive wheel clearance hole communicating with the outside is formed at the central position; 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 left side protrudes out of the drive wheel clearance hole.

[0011] To accomplish another task of the present invention, the technical solution provided by the present invention is as follows: the primary transmission mechanism comprises a worm, a worm wheel, a sun gear and a sun gear shaft; the worm is directly formed on the drive motor shaft in the worm seat cavity or one end of the worm is fixedly connected to the front end of the drive motor shaft by an independent component, and the other end is rotatably supported on the front cavity wall of the worm seat cavity; the middle part of the worm is meshed with the worm wheel; the worm wheel is rotatably arranged in the housing cavity and a worm wheel center hole is provided at the center position of the worm wheel; the worm wheel center hole is hollowly sleeved on the sun gear shaft; a sun gear enveloping flange is formed on the side of the sun gear facing the worm wheel; the sun The gear envelope flange is fixed by the worm gear envelope, and a sun gear center hole is formed at the axial center position of the sun gear, which runs from the left side to the right side of the sun gear and communicates with the worm gear center hole. The sun gear center hole is sleeved on the sun gear shaft, and the right end of the sun gear shaft is fixed to the sun gear shaft fixing seat at the center position of the bottom wall of the housing cavity, and the right end of the sun gear shaft passes through the worm gear center hole and the sun gear center hole in sequence and extends to the three-stage transmission mechanism, the two-stage transmission mechanism is meshed with the sun gear, and the two-stage transmission mechanism is also limited between the seat fixing connecting plate and the housing.

[0012] To embody another task of the present invention, the technical solution provided by the present invention is: the two-stage transmission mechanism includes an inner gear ring, a first planetary gear, a second planetary gear and a third planetary gear, and the edge of the inner gear ring is extended with an inner gear ring first limiting ear, an inner gear ring second limiting ear and an inner gear ring third limiting ear in an interval state. When the seat fixing connecting plate is fixed to the shell, the inner gear ring is limited between the seat fixing connecting plate and the shell by the inner gear ring first limiting ear, the inner gear ring second limiting ear and the inner gear ring third limiting ear. An inner gear ring is formed on the cavity wall of the inner gear ring planetary gear cavity of the inner gear ring, and the central area of ​​the inner 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 in a state of being 120° apart from each other in the circumferential direction of the inner gear ring planetary gear cavity and are respectively meshed with the sun gear and the inner gear ring; the three-stage transmission mechanism is simultaneously coordinated with the first planetary gear, the second planetary gear and the third planetary gear.

[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 the position 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 surface of the output gear A supporting shaft head extends to the left from the central position of the seat, and the output gear together with the supporting shaft head extends to the outside of the drive gear clearance hole through the gear seat cavity of the seat fixing connecting plate. In the use state, the output gear is transmission connected with 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. The left side of the support plate abuts against the cavity top wall of the gear seat cavity.

[0014] To accomplish another task of the present invention, the technical solution provided by the present invention 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 tooth 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 tooth transition section constitute an integral structure inseparable from the support plate and the toothless tooth enveloping sleeve respectively.

[0015] In another specific embodiment of the present invention, the drive motor is fixed to the shell in a horizontal cantilever state at a position corresponding to the worm seat, wherein drive motor shell snap-fitting fixing claws are formed at one end of the drive motor shell of the drive motor facing the worm seat and at intervals in the circumferential direction of the drive motor shell, and the drive motor snap-fitting fixing claws are snap-fitted with the worm seat at a position corresponding to the worm seat to achieve fixation with the shell, and the grooves between each two adjacent drive motor snap-fitting fixing claws are compensated and embedded by groove compensation pins formed on the left side of the shell, 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 shell together with the worm seat and the groove compensation pin are integrally molded by plastic.

[0016] In another specific embodiment of the present invention, a sun gear shaft fixing hole is formed in the central position of the sun gear shaft fixing seat, and the sun gear shaft fixing hole is a blind hole with an opening facing left; the sun gear shaft is a stepped shaft having a first segment, a second segment and a third segment, wherein the diameter of the first segment is larger than the diameter of the second segment, and the diameter of the second segment is larger than the diameter of the third segment, the first segment is fixed in the sun gear shaft fixing hole, the sun gear center hole is rotatably sleeved on the second segment, and a sun gear shaft sleeve hole is opened at the central position of the output gear seat, and the sun gear shaft sleeve hole extends to the left to the toothless transition section and is rotatably sleeved on the third segment.

[0017] In another specific embodiment of the present invention, a pair of inner gear ring embedding foot recesses are formed on the outer wall of the shell on one side facing the seat fixing connecting plate and around the circumferential direction of the shell at a distance of 180° from each other, and a pair of inner gear ring embedding feet are formed on the outer wall of the inner gear ring and at positions corresponding to the pair of inner gear ring embedding foot recesses, and the pair of inner gear ring embedding feet are embedded in the pair of inner gear ring embedding foot recesses.

[0018] In another specific embodiment of the present invention, an inner gear ring retaining stack ring is formed on the left side of the worm wheel and around the worm wheel, protruding from the left side of the worm wheel. The inner gear ring retaining stack ring is located on the outside of the plastic enveloping step sleeve and the left side of the plastic enveloping step sleeve is in contact with the right side of the inner gear ring.

[0019] In a more specific embodiment of the present invention, a group of shell connecting screw holes are provided on the seat fixing connecting plate, each of which is provided with a shell fixing connecting screw, a first limiting ear screw hole is provided on the first limiting ear of the inner gear ring, a second limiting ear screw hole is provided on the second limiting ear of the inner gear ring, and a third limiting ear screw hole is provided on the third limiting ear of the inner gear ring, and a shell fixing connecting screw seat is formed on the outer wall of the shell and at a position corresponding to the shell fixing connecting screw, and a screw matching threaded hole is formed in the axial center of the shell fixing connecting screw seat, through which the shell fixing connecting screw passes through the first, second and third limiting The ear screw hole is screwed into the screw matching threaded hole to fix the seat fixing connecting plate to the shell, and at the same time, the inner gear ring is limited between the right side surface of the seat fixing connecting plate and the left side surface of the shell; a pair of anti-rotation embedded feet holes are opened on the seat fixing connecting plate, and a pair of anti-rotation embedded feet are extended at the position of the shell cavity opening of the shell and at the position corresponding to the anti-rotation embedded feet hole, and the anti-rotation embedded feet are inserted into the pair of anti-rotation embedded feet holes; seat fixing wings are also folded on the left and right sides of the seat fixing connecting plate, and seat fixing wing fixing holes are opened on the seat fixing wings. When in use, the seat fixing wing fixing holes are fixed to the seat at the position corresponding to the height adjustment mechanism in the car seat through fasteners.

[0020] One of the technical effects of the technical solution provided by the present invention is that, since a primary, secondary and tertiary transmission mechanism is adopted in the structural system of the transmission device, the number of transmission stages from the power input of the driving motor as the power to the tertiary transmission mechanism as the power output is reduced compared with the prior art, so that the structure can be simplified, the weight can be reduced, the volume can be reasonably reduced, the transmission efficiency can be improved, the noise and vibration can be reduced, and the probability of failure can be reduced; secondly, since there is no sliding fit between the primary transmission mechanism and the secondary transmission mechanism and between the secondary transmission mechanism and the tertiary transmission mechanism, there is no severe wear between the transmission components, so that the service life of the components can be improved, the transmission efficiency can be improved, the energy consumption can be reduced, the noise and vibration can be further reduced, and the fitting accuracy and stability between the components can be improved; thirdly, since the structural system of the secondary transmission mechanism uses a sun gear driven by the primary transmission mechanism and connected to the sun gear, The first, second and third planetary gears are meshed with each other, thereby significantly improving the reasonable coordination effect between the secondary transmission mechanism and the primary transmission mechanism, further embodying the compactness of the structure and the miniaturization of the volume, fully guaranteeing the ideal transmission efficiency, increasing the load and transmission ratio, and embodying the ultimate transmission accuracy and transmission reliability; fourthly, since the worm wheel in the primary transmission mechanism and the support plate in the tertiary transmission mechanism are respectively formed by plastic molding, and the sun gear enveloping flange of the sun gear is enveloped by the plastic enveloping step sleeve of the worm wheel, and the output gear seat and the toothless transition section are enveloped by the support plate, thereby avoiding blind selection of materials for related transmission components, and ensuring a good balance between the strength and durability of the transmission components and the self-lubrication, noise reduction, avoidance of component friction damage, overall weight reduction, vibration absorption performance, and impact resistance and buffering. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of an embodiment of the present invention; Figure 2 for Figure 1 Cross-sectional view after assembly. DETAILED DESCRIPTION

[0022] In order to more clearly understand the technical essence and beneficial effects of the present invention, the applicant provides a detailed description in the form of embodiments below. However, the description of the embodiments is not a limitation of the present invention. Any equivalent changes made based on the concept of the present invention that are merely formal and not substantial should be regarded as within the scope of the technical solution of the present invention.

[0023] In the following description, all concepts related to up, down, left, right, front and back directions or orientations are based on the current Figure 1 The position states shown are for example only and should not be understood as a special limitation on the technical solution provided by the present invention.

[0024] See also Figure 1 and Figure 2 , showing 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, a worm seat cavity 211 of the worm seat 21 is communicated with the housing cavity 22 of the housing 2, a 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 corresponding to one side of the aforementioned housing cavity opening 221, and a gear seat cavity 31 ( Figure 2 Detailed description), the central position of the left side of the gear seat cavity 31 is formed with a drive wheel clearance hole 311 communicating with the outside world; a transmission device 4 is shown, as the technical key points of the technical solution provided by the present invention: the aforementioned 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 arranged in the aforementioned housing cavity 22 and is transmission-connected with the aforementioned drive motor shaft 11 in the aforementioned worm seat cavity 211, the secondary transmission mechanism 42 is arranged in the housing cavity 22 at a position corresponding to the left side of the primary transmission mechanism 41 and is transmission-coordinated with the aforementioned primary transmission mechanism 41, the tertiary transmission mechanism 43 is arranged in the aforementioned drive wheel clearance 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 is coordinated with the aforementioned secondary transmission mechanism 42, and the aforementioned drive wheel clearance hole 311 is protruded from the left side.

[0025] From the above description, it can be seen that since the transmission mechanism of the structural system of the transmission device 4 of the present invention adopts the first-stage, second-stage and third-stage transmission mechanisms 41, 42 and 43, one transmission mechanism is reduced compared to the four-stage transmission design mode which is influenced by the traditional design concept to a certain extent, that is, the recognized four-stage transmission is changed into a three-stage transmission, thereby faithfully realizing many corresponding technical effects among one of the technical effects mentioned above by the applicant.

[0026] See you next time Figure 1 and Figure 2 The primary transmission mechanism 41 comprises a worm 411, a worm wheel 412, a sun gear 413 and a sun gear shaft 414. In this embodiment, the worm 411 is directly formed on the drive motor shaft 11 in the worm housing cavity 211. Since the worm 411 is directly formed on the drive motor shaft 11 in this embodiment, the end of the drive motor shaft 11 is Figure 1The front end portion of the position state shown is rotatably supported on a support bearing 212 on the front cavity wall of a worm seat cavity 211 in which a worm seat 21 is provided, and the worm 411 is meshed with a worm wheel 412, and the worm wheel 412 is rotatably provided in the aforementioned housing cavity 22 and has a worm wheel center hole 4121 ( Figure 2 41. As shown in the figure, the worm gear center hole 4121 is loosely sleeved on the sun gear shaft 414, and a sun gear enveloping flange 4131 is formed on the side of the sun gear 413 facing the worm gear 412. The sun gear enveloping flange 4131 is enveloping and fixed by the aforementioned worm gear 412. A sun gear center hole 4132 is formed at the axial center position of the sun gear 413, which passes from the left side to the right side of the sun gear 413 and communicates with the aforementioned worm gear center hole 4121. The sun gear center hole 4132 is rotatably sleeved on the aforementioned sun gear shaft 414, and the right end of the sun gear shaft 414 is connected to the cavity bottom wall 222 of the housing cavity 22 ( Figure 2 The sun gear shaft fixing seat 2221 is fixed at the central position of the seat (marked), and the right end of the sun gear shaft 414 passes through the aforementioned worm gear center hole 4121 and the 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 meshed with the aforementioned sun gear 413, and the two-stage transmission mechanism 42 is also limited between the aforementioned seat fixing connecting plate 3 and the aforementioned shell 2.

[0027] As another embodiment, the aforementioned worm 411 can be constructed as an independent component, and one end of the worm 411 of the independent component is fixedly connected to the aforementioned end (i.e., the "front end") of the drive motor shaft 11. The fixed connection method is preferably fixed by a flat key, and of course, a coupling or other equivalent methods can also be used. The other end of the worm 411, i.e., the front end, is rotatably supported on a supporting bearing 212 arranged on the front cavity wall of the aforementioned worm seat cavity 211, and the middle part of the worm 411 (the worm thread in the middle part) is meshed with the worm wheel 412.

[0028] From the above description, it can be seen that since the secondary transmission mechanism 42 and the sun gear 413 are meshed in transmission cooperation, there is no sliding cooperation situation in the prior art, which objectively confirms the advantages involved in the second technical effect in the above technical effect column of the applicant.

[0029] See you next time Figure 1 and Figure 2The aforementioned secondary transmission mechanism 42 includes an inner gear ring 421, a first planetary gear 422, a second planetary gear 423 and a third planetary gear 424. The edge of the inner gear ring 421 is extended with an inner gear ring first limiting ear 4211, an inner gear ring second limiting ear 4212 and an inner gear ring third limiting ear 4213 in an interval state. When the aforementioned seat fixing connecting plate 3 is fixed to the aforementioned shell 2, the inner gear ring 421 is limited between the aforementioned seat fixing connecting plate 3 and the aforementioned shell 2 by the inner gear ring first limiting ear 4211, the inner gear ring second limiting ear 4212 and the inner gear ring third limiting ear 4213. An inner gear ring 42141 is formed on the cavity wall of 214, and the central area of ​​the aforementioned inner gear ring planetary gear cavity 4214 corresponds to the aforementioned sun gear 413, that is, the aforementioned sun gear 413 is located at the central position of the inner gear ring planetary gear cavity 4214, and the first planetary gear 422, the second planetary gear 423 and the third planetary gear 424 are arranged in a state of being 120° apart from each other in the circumferential direction of the inner gear ring planetary gear cavity 4214 and are respectively engaged with the aforementioned sun gear 413 and the inner gear ring 42141; the aforementioned three-stage transmission mechanism 43 is simultaneously coordinated with the aforementioned first planetary gear 422, the second planetary gear 423 and the third planetary gear 424.

[0030] From the content of the previous paragraph, it can be seen that the present invention adopts three planetary gears for the secondary transmission mechanism 42, namely the first planetary gear 422, the second planetary gear 423 and the third planetary gear 424, and makes the three planetary gears mesh with the sun gear 413 and the inner ring gear 42141 at the same time, thereby faithfully realizing the third technical effect mentioned by the applicant in the above technical effect column.

[0031] See you next time Figure 1 and Figure 2The aforementioned three-stage transmission mechanism 43 includes an output gear seat 431, an output gear 432 and a support plate 433. On the right side of the output gear seat 431 and at positions corresponding to the aforementioned first planetary gear 422, the second planetary gear 423 and the third planetary gear 424, a planetary gear matching shaft head 4311 is extended. Since a first shaft head matching hole 4221 is provided in the center of the aforementioned first planetary gear 422, a second shaft head matching hole 4231 is provided in the center of the second planetary gear 423, and a third shaft head matching hole 4231 is provided in the center of the third planetary gear 424. A third shaft head matching hole 4241 is provided, so there are three planetary gear matching shaft heads 4311 shown in the figure, and the three planetary gear matching shaft heads 4311 are respectively matched with the first shaft head matching hole 4221 of the first planetary gear 422, the second shaft head matching hole 4231 of the second planetary gear 423 and the third shaft head matching hole 4241 of the third planetary gear 424, and at the same time, 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, and the output gear 432 is formed on the left side of the output gear seat 431, and a toothless transition section 4321 (also called a "smooth column section") is formed between the output gear 432 and the left side of the output gear seat 431, and a support shaft head 4322 extends to the left at the central position of the left side of the output gear 432. The output gear 432 together with the support shaft head 4322 extends to the outside of the aforementioned drive gear clearance hole 311 through the gear seat cavity 31 of the aforementioned seat fixing connecting plate 3. In the use state, the aforementioned output gear 432 and the height adjustment mechanism set in the car seat Transmission connection, and the aforementioned supporting shaft head 4322 is rotatably supported on the seat, the support plate 433 is wrapped around the aforementioned output gear seat 431 and a toothless transition section sheath 4331 is extended from the left central part of the support plate 433, the toothless transition section sheath 4331 is wrapped around the outer wall of the toothless transition section 4321, and an output gear seat wrapping edge 4332 is extended on the right side of the support plate 433 and at the edge corresponding to the right side surface of the output gear seat 431, and the left side of the support plate 433 abuts against the top wall of the gear seat cavity 31.

[0032] See you next time Figure 1 and Figure 2The 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 constitute an integral structure inseparable from the worm wheel 412; the support plate 433 is a plastic support plate molded by plastic, and the toothless tooth 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 tooth transition section 4321 constitute an integral structure inseparable from the support plate 433 and the toothless tooth enveloping sleeve 4331 respectively.

[0033] From the above description, it can be seen that since the worm gear 412 in the structural system of the first transmission mechanism 41 and the support plate 433 in the structural system of the third transmission mechanism 43 are made of plastic molding, the fourth technical effect described by the applicant in the technical effect column above is objectively achieved.

[0034] See you next time Figure 1 and Figure 2 , still Figure 1 Taking the position state as an example, the aforementioned drive 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 seat 21, wherein, at one end of the drive motor housing of the drive motor 1 facing the aforementioned worm seat 21 and spaced around the circumferential direction of the drive motor housing, there are drive motor housing snap-fitting fixing claws 12, and the drive motor snap-fitting fixing claws 12 are snapped with the worm seat 21 at a position corresponding to the worm seat 21 to achieve fixation with the aforementioned housing 2, and the grooves 121 between each two adjacent drive motor snap-fitting fixing claws 12 are compensated and embedded by the left groove compensation pin 23 formed on the housing 2, and 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 rotation functions.

[0035] In this embodiment, the DC motor is a brushed DC motor. However, if a brushless DC motor is used to replace the brushed DC motor, it should be considered equivalent. The housing 2, the worm seat 21 and the groove compensation foot 23 are integrally molded by plastic.

[0036] A sun gear shaft insertion hole 22211 ( Figure 2), the sun gear shaft fixing hole 22211 is a blind hole with its opening facing left; the aforementioned sun gear shaft 414 is a stepped shaft having a first segment 4141, a second segment 4142 and a third segment 4143, wherein the diameter of the first segment 4141 is greater than the diameter of the second segment 4142, and the diameter of the second segment 4142 is greater than the diameter of the third segment 4143, the middle part and the right end of the aforementioned first segment 4141 are fixed in the aforementioned sun gear shaft fixing hole 22211, and the left end of the first segment 4141 protrudes out of 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 segment 4141, the aforementioned sun gear center hole 4132 is rotatably sleeved on the aforementioned second segment 4142, and a sun gear shaft sleeve hole 4312 ( Figure 2 As shown), the sun gear shaft idler hole 4312 extends leftward to the aforementioned toothless transition section 4321 and is rotatably idle on the aforementioned third segment 4143.

[0037] A pair of inner gear ring embedded foot recesses 24 are formed on the outer wall of the shell 2 on one side facing the seat fixing connecting plate 3 and around the circumferential direction of the shell 2 at a distance of 180° from each other, and a pair of inner gear ring embedded feet 4215 are formed on the outer wall of the inner gear ring 421 and at positions corresponding to the pair of inner gear ring embedded foot recesses 24, and the pair of inner gear ring embedded feet 4215 are embedded with the pair of inner gear ring embedded foot recesses 24.

[0038] See Figure 1 Figure 2 On the left side of the aforementioned worm wheel 412 and surrounding the worm wheel 412, there is an inner gear ring retaining stack ring 4123 protruding from the left side of the worm wheel 412. The inner gear ring retaining stack ring 4123 is located on the outside of the aforementioned plastic enveloping step sleeve 4122 and the left side of the plastic enveloping step sleeve 4122 is in contact with the right side of the aforementioned inner gear ring 421.

[0039] A group of shell connecting screw holes 32 are provided on the aforementioned seat fixing connecting plate 3, and each of the group of shell fixing connecting screw holes 32 is provided with a shell fixing connecting screw 321, a first limiting ear screw hole 42111 is provided on the aforementioned first limiting ear 4211 of the inner gear ring, a second limiting ear screw hole 42121 is provided on the aforementioned second limiting ear 4212 of the inner gear ring, and a third limiting ear screw hole 42131 is provided on the aforementioned third limiting ear 4213 of the inner gear ring, and a shell fixing connecting screw seat 25 is formed on the outer wall of the aforementioned shell 2 and at a position corresponding to the aforementioned shell fixing connecting screw 321, and a screw matching threaded hole 251 is formed in the axial center of the shell fixing connecting screw seat 25, through which the aforementioned shell fixing connecting screw 321 passes through the first, second and third limiting ear screw holes 42111, 42121, 42131 and screw into the aforementioned screw to cooperate with the threaded hole 251 to fix the seat fixing connecting plate 3 to the shell 2, and at the same time limit the aforementioned internal gear ring 421 between the right side of the seat fixing connecting plate 3 and the left side of the shell 2; a pair of anti-rotation foot holes 33 are provided on the seat fixing connecting plate 3, and a pair of anti-rotation feet 26 are extended at the position of the shell cavity opening 221 of the aforementioned shell 2 and at the position corresponding to the anti-rotation foot holes 33, and the anti-rotation feet 26 are inserted into the pair of anti-rotation foot holes 33; seat fixing wings 34 are also folded on the left and right sides of the seat fixing connecting plate 3, and seat fixing wing fixing holes 341 are provided on the seat fixing wings 34. When in use, the seat fixing wing fixing holes 341 are fixed to the seat at the position corresponding to the height adjustment mechanism in the car seat by fasteners.

[0040] Preferably, before the seat fixing connecting plate 3 is screwed together with the screw matching threaded hole 251 of the aforementioned shell fixing connecting seat 25 through the aforementioned shell fixing connecting screw 321, gear grease (i.e. "gear grease") is applied to the aforementioned first, second and third planetary gears 422, 423, 424 and the sun gear 413.

[0041] Preferably, a pair of fixed wing abutment rings 4333 protruding from the left side of the support plate 433 are formed on the left side of the aforementioned support plate 433 and at a position surrounding the periphery of the aforementioned toothless tooth sleeve 4331, and the left side of the pair of fixed wing abutment rings 4333 are in abutment contact with the right side of the aforementioned seat fixing wing 34.

[0042] Applicant combination Figure 1 and Figure 2To describe the action process of the present invention, it is necessary to first state that: usually, the operating control switch of the height adjustment device of the automobile seat is usually set on the side of the seat, and the operating control switch is divided into manual adjustment and automatic adjustment. Although the control methods of manual adjustment and automatic adjustment are different, the functions and principles are the same. If it is manual adjustment, the seat height is adjusted by a wrench or knob; if it is automatic adjustment, the seat height is adjusted by a button. The principle of adjustment, taking the driving seat as an example, is to ensure that the line of sight is kept at an appropriate distance from the instrument panel, the pedals can be easily touched, and the knees and feet are kept naturally bent to improve driving comfort and safety.

[0043] If the car seat is to be raised, the manual or automatic adjustment control switch is operated, and the drive motor 1 works clockwise, and the drive motor shaft 11 drives the worm 411 of the structural system of the primary transmission mechanism 41, and the worm 411 drives the worm wheel 412 meshing with it, and the worm wheel 412 drives the sun gear 413. Since the secondary transmission mechanism 42 is in transmission cooperation with the sun gear 413 of the primary transmission mechanism 41, in the process that the worm wheel 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 inner gear ring 42141. Since the three-stage transmission mechanism 43 is matched with the two-stage transmission mechanism 42, specifically: the three planetary gear matching shaft heads 4311 on the right side of the output gear seat 431 of the structural system of the three-stage transmission mechanism 43 are respectively inserted into the first shaft head matching hole 4221 of the first planetary gear 422, the second shaft head matching hole 4231 of the second planetary gear 423 and the third shaft head matching hole 4241 of the third planetary gear 424, so that the first, second and third planetary gears 422, 423, 424 rotate around the aforementioned inner gear ring 42141 and simultaneously drive the output gear seat 431, so that the output gear seat 431 drives the output gear 432 which is an integral structure therewith, and the output gear 432 drives the height adjustment mechanism arranged in the car seat, that is, the height adjustment mechanism in the aforementioned car seat, so that the car seat is raised upward to the required degree and basically meets the aforementioned requirements. Since the process of reverse adjustment of the car seat, i.e., lowering adjustment, is opposite to the aforementioned raising adjustment process, specifically, it can be achieved by operating the manual or automatic adjustment control switch in the opposite direction relative to the aforementioned operation to make the drive motor 1 work counterclockwise, the applicant will not elaborate on it.

[0044] In summary, the technical solution provided by the present invention makes up for the shortcomings of the existing technology, successfully completes the invention task, and faithfully realizes the technical effects stated by the applicant in the technical effect column above.

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 transmission device (4) comprises a primary transmission mechanism (41), a secondary transmission mechanism (42) and a tertiary transmission mechanism (43); the primary transmission mechanism (41) is arranged in the housing cavity (22) and is transmission-connected to the drive motor shaft (11) in the worm seat cavity (211); the secondary transmission mechanism (42) is arranged in the housing cavity (22) at a position corresponding to the left side of the primary transmission mechanism (41) and is transmission-coordinated with the primary transmission mechanism (41); the tertiary transmission mechanism (43) is arranged in the drive wheel clearance hole (311) at a position corresponding to the left side of the secondary transmission mechanism (42); the right side of the tertiary transmission mechanism (43) is coordinated with the secondary transmission mechanism (42), while the left side protrudes out of the drive wheel clearance hole (311).

2. The vehicle seat height adjustment device according to claim 1, characterized in that: The primary transmission mechanism (41) comprises 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) in the worm seat cavity (211) or has one end fixedly connected to the front end of the drive motor shaft (11) by an independent component, and the other end is rotatably supported on the front cavity wall of the worm seat cavity (211); the worm (411) The middle part of the sun gear (413) meshes with the worm wheel (412), the worm wheel (412) is rotatably arranged in the housing cavity (22) and a worm wheel center hole (4121) is provided at the center position of the worm wheel (412), the worm wheel center hole (4121) is loosely sleeved on the sun gear shaft (414), and a sun gear enveloping flange (4131) is formed on the side of the sun gear (413) facing the worm wheel (412), and the sun gear enveloping flange (4131) The worm wheel (412) is enveloping and fixing the sun gear (413). A sun gear center hole (4132) is formed at the axial center position of the sun gear (413) and passes through from the left side of the sun gear (413) to the right side and communicates with the worm wheel center hole (4121). 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 center position of the cavity 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 three-stage transmission mechanism (43). The two-stage transmission mechanism (42) is meshed with the sun gear (413) in transmission cooperation, and the two-stage 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, characterized in that: The secondary transmission mechanism (42) comprises an inner gear ring (421), a first planetary gear (422), a second planetary gear (423) and a third planetary gear (424); an inner gear ring first limiting ear (4211), an inner gear ring second limiting ear (4212) and an inner gear ring third limiting ear (4213) are extended in a spaced manner from the edge of the inner gear ring (421); when the seat fixing connecting plate (3) is fixed to the shell (2), the inner gear ring (421) is limited between the seat fixing connecting plate (3) and the shell (2) by the inner gear ring first limiting ear (4211), the inner gear ring second limiting ear (4212) and the inner gear ring third limiting ear (4213). An inner gear ring (42141) is formed on the cavity wall of the inner gear ring planetary gear cavity (4214) of the inner gear ring (421), and the central area of ​​the inner 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 in a state of being 120° apart from each other in the circumferential direction of the inner gear ring planetary gear cavity (4214) and are respectively meshed with the sun gear (413) and the inner gear ring (42141); the three-stage transmission mechanism (43) is simultaneously matched with the first planetary gear (422), the second planetary gear (423) and the third planetary gear (424).

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 gear 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. 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 tooth 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 tooth transition section (4321) constitute an integral structure inseparable from the support plate (433) and the toothless tooth enveloping sleeve (4331), respectively.

6. The vehicle seat height adjustment device according to claim 1, characterized in that: The drive motor (1) is fixed to the housing (2) in a horizontal cantilever state at a position corresponding to the worm seat (21), wherein drive motor housing snap-fit ​​fixing claws (12) are formed 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, the drive motor snap-fit ​​fixing claws (12) are snap-fitted to the worm seat (21) at a position corresponding to the worm seat (21) to achieve fixation to the housing (2), the grooves (121) between each two adjacent drive motor snap-fit ​​fixing claws (12) are compensated and embedded by a left groove compensation foot (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 rotation 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 foot (23) are integrally molded by plastic.

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

8. The vehicle seat height adjustment device according to claim 3, characterized in that: A pair of inner gear ring embedded foot recesses (24) are formed on the outer wall of the shell (2) on the side facing the seat fixing connecting plate (3) and around the circumferential direction of the shell (2) at a distance of 180 degrees from each other, and a pair of inner gear ring embedded feet (4215) are formed on the outer wall of the inner gear ring (421) and at positions corresponding to the pair of inner gear ring embedded foot recesses (24), and the pair of inner gear ring embedded feet (4215) are embedded with the pair of inner gear ring embedded foot recesses (24).

9. The vehicle seat height adjustment device according to claim 3, characterized in that: An inner toothed ring retaining stack ring (4123) is formed on the left side of the worm wheel (412) and around the worm wheel (412), and protrudes from the left side of the worm wheel (412). The inner toothed ring retaining stack ring (4123) is located on the outside of the plastic enveloping step sleeve (4122), and the left side of the plastic enveloping step sleeve (4122) contacts the right side of the inner toothed ring (421).

10. The vehicle seat height adjustment device according to claim 8, characterized in that: A group of shell connecting screw holes (32) are provided on the seat fixing connecting plate (3), each of which is provided with a shell fixing connecting screw (321). A first limiting ear screw hole (42111) is provided on the first limiting ear (4211) of the inner gear ring, a second limiting ear screw hole (42121) is provided on the second limiting ear (4212) of the inner gear ring, and a third limiting ear screw hole (42131) is provided on the third limiting ear (4213) of the inner gear ring. A shell fixing connecting screw seat (25) is formed on the outer wall of the shell (2) and at a position corresponding to the shell fixing connecting screw (321). A screw matching threaded hole (251) is formed in the axial center of the shell fixing connecting screw seat (25), and the shell fixing connecting screw (321) passes through the first, second and third limiting ear screw holes (42111, 42121) respectively. 21, 42131) and screwing the screw into the threaded hole (251) to fix the seat fixing connecting plate (3) to the shell (2), and at the same time limiting the inner gear ring (421) between the right side of the seat fixing connecting plate (3) and the left side of the shell (2); a pair of anti-rotation pin holes (33) are provided on the seat fixing connecting plate (3), and a pair of anti-rotation pins (26) are extended at the position of the shell cavity opening (221) of the shell (2) and at the position corresponding to the anti-rotation pin holes (33), and the anti-rotation pins (26) are inserted into the pair of anti-rotation pin holes (33); seat fixing wings (34) are folded on the left and right sides of the seat fixing connecting plate (3), and seat fixing wing fixing holes (341) are provided on the seat fixing wings (34). In a use state, the seat fixing wing fixing holes (341) are fixed to the seat at a position corresponding to the height adjustment mechanism in the car seat through fasteners.

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