Electric adjusting device for height of automobile seat

Abstract

An electric adjusting device for the height of an automobile seat comprises a worm and gear reduction gearbox body. The driving motor is fixed with a box body of the worm and gear reduction gearbox, and a shaft of the driving motor forms a worm; the worm gear is arranged in the box body cavity and meshed with the worm, and a worm gear eccentric shaft is formed on the left side of the worm gear; the worm gear and worm reduction gearbox is provided with a guide sliding plate, a driving gear, an output gear set and a box cover in sequence from right to left, and is characterized by further comprising a self-lubricating sleeve and a guide sliding plate sliding guide seat, the self-lubricating sleeve is arranged on a worm gear eccentric shaft in a sleeving mode, and the guide sliding plate sliding guide seat is located between the opposite sides of the box cover and a box body of the worm gear and worm reduction gearbox. The guide sliding plate is arranged in the guide sliding plate sliding cavity, and the self-lubricating sleeve is matched with the guide sliding plate and the driving gear along with the worm gear eccentric shaft. The advantages are that the structure is simplified, and manufacturing difficulty and cost are reduced; the friction pair relation of motion conversion is optimized well; transmission efficiency is improved, noise is reduced, and service life is prolonged; the size is small, assembly efficiency is improved, and maintenance cost is reduced.

Description

Technical Field

[0001] This invention belongs to the field of automotive parts technology, specifically relating to an electric height adjustment device for automotive seats. Background Technology

[0002] Car seat height adjustment is a standard feature in modern vehicles, and its positive benefits are not limited to the following aspects: First, it optimizes visibility and improves safety. For the driver, adjusting to a suitable height ensures optimal forward and hood visibility, allows for rearward visibility via the rearview mirror, and enables accurate judgment of the distance between the front of the vehicle and obstacles, effectively reducing blind spots. Second, it helps ensure correct driving posture and precise control. A suitable height allows the driver to naturally grip the steering wheel with slightly bent arms. Third, it enhances safety and provides protection. Seat height directly affects whether the seat belt can pass through the middle of the shoulder and whether the head is within the effective protection range of the headrest. Incorrect posture may lead to seat belt strangulation or whiplash injury in a collision. Fourth, it accommodates different body types and improves comfort. This feature fully considers ergonomic differences. Shorter drivers can raise the seat to "sink" into the car, while taller drivers can lower it for ample headroom. Fifth, it improves ease of getting in and out of the vehicle. Some models automatically move the seat back after the engine is turned off, making it easier to exit the vehicle. When restarted, the seat will automatically return to the memory position. Therefore, for situations where frequent driver changes are required, the one-button memory function eliminates the hassle of repeated adjustments.

[0003] The "Automotive Seat Height Adjustment Device" recommended by Chinese Patent CN222148251U addresses the four common shortcomings of the prior art summarized in its background section and faithfully delivers the corresponding technical effects outlined in its technical effects section. However, CN222148251U still has the following drawbacks: the transmission path is complex and involves many parts. The transmission path consists of: motor shaft (worm), worm gear, sun gear, three planetary gears, output gear seat, and output gear. The composite structure of worm gear and planetary gear system necessitates a large number of independent or combined components, placing extremely stringent requirements on mold and assembly precision. Because the meshing clearance between the three planetary gears and the sun gear and internal gear ring is difficult to be uniform, it easily leads to high noise, jamming, or uneven force distribution, affecting transmission efficiency and lifespan. The complex structure results in high material and manufacturing costs, and the cumbersome assembly process impacts manufacturing efficiency.

[0004] For example, CN105978217A provides a "high-strength motor assembly for raising a seat". The technical solution involved is based on the shortcomings of CN103182959A (seat tilting mechanism for automobile seats) and CN202448774U (a cross slide gear system). Moreover, this patent does not use the structural principle of the aforementioned CN222148251U. While CN105978217A objectively delivers on the technical effects described in its specification, it still suffers from the following shortcomings: First, because the guide plate and the gearbox housing form a sliding pair, and the gearbox housing bears a stringent guiding function, a pair of arc-shaped notches, a pair of limiting grooves, and a pair of strip grooves need to be formed on the side of the gearbox housing facing the gearbox cover. Furthermore, a pair of matching arc-shaped convex surfaces, a pair of limiting protrusions, and a pair of outwardly protruding limiting strips need to be machined on the guide plate. This significantly increases the manufacturing difficulty and cost of the gearbox housing, i.e., the worm gear reducer housing. Second, because the guide plate and the complex wall of the gearbox housing form a sliding pair, in addition to the aforementioned manufacturing difficulties, machining accuracy is difficult to guarantee, resulting in high repair costs after wear, and even the risk of rendering the entire gearbox housing unusable. Third, to ensure reasonable strength and achieve the desired wear resistance, the gearbox housing and guide plate are made of metal. This results in a high coefficient of friction between metal parts and limited lubrication, which can easily affect transmission efficiency and generate noise. Summary of the Invention

[0005] The objective of this invention is to provide an electric height adjustment device for automobile seats that helps to eliminate the sliding pair relationship between the guide plate and the worm gear reducer housing, thereby significantly simplifying the structure of the worm gear reducer housing, reducing manufacturing difficulty and cost; optimizes the motion conversion by changing the friction pair relationship from direct drive of the worm gear eccentric shaft to indirect drive of the guide plate; significantly reduces the frictional resistance of the guide plate, thereby improving transmission efficiency, reducing noise, reducing energy loss, and increasing overall service life; and facilitates good modularity, thereby significantly reducing size, improving processing and assembly efficiency, and reducing maintenance costs.

[0006] The present invention achieves its objective by providing an electric height adjustment device for an automobile seat, comprising: a worm gear reducer housing; a drive motor fixed to the worm gear reducer housing, the drive motor shaft being configured as a worm and extending into the housing cavity of the worm gear reducer housing; a worm wheel rotatably disposed within the housing cavity and meshing with the worm, and an eccentric shaft formed on the left side of the worm wheel; a guide plate, a drive gear, an output gear set, and a housing cover arranged sequentially from right to left; the eccentric shaft meshing with the guide plate and the drive gear sequentially from right to left; the right side of the drive gear meshing with the guide plate and meshing with the output gear set, the output gear set extending into the housing cavity; and a guide plate, a drive gear ... The cover is located on the left side of the center position and engages with the height adjustment mechanism inside the car seat during use. The cover is fixed to the left side of the worm gear reducer housing. The feature is that it further includes a self-lubricating sleeve and a guide plate sliding guide seat. The self-lubricating sleeve is fitted onto the worm gear eccentric shaft and rotates with it. The guide plate sliding guide seat is located between the cover and the worm gear reducer housing on opposite sides and is fixed between the cover and the worm gear reducer housing when the cover and the worm gear reducer housing are fixed. The guide plate sliding guide seat forms a guide sliding plate sliding cavity. The guide plate is slidably disposed within the guide plate sliding cavity. The self-lubricating sleeve engages with the worm gear eccentric shaft, the guide plate, and the drive gear.

[0007] In a specific embodiment of the present invention, a worm gear pivot support shaft is disposed within the housing cavity of the worm gear reducer and at the center of the bottom wall of the housing cavity, perpendicular to the bottom wall of the housing cavity. The worm gear is rotatably mounted on the worm gear pivot support shaft through a worm gear shaft hole formed at its center. A worm gear eccentric shaft center hole is formed at the axial center of the worm gear eccentric shaft and at a position corresponding to the worm gear shaft hole. The left end of the worm gear pivot support shaft is supported on the output gear set after passing through the worm gear shaft hole and the worm gear eccentric shaft center hole in sequence.

[0008] In another specific embodiment of the present invention, a damping torsion spring is fitted on the worm gear pivot support shaft at a position corresponding to the right side of the worm gear. A damping torsion spring cavity recessed into the right side surface of the worm gear is formed at the center of the right side of the worm gear. A damping torsion spring arm embedding compensation groove and a damping torsion spring positioning foot insertion hole are formed on the right side of the worm gear. The damping torsion spring cooperates with the damping torsion spring cavity. The damping torsion spring arm is fitted into the damping torsion spring arm embedding compensation groove. The damping torsion spring arm positioning foot formed at the end of the damping torsion spring arm is embedded in the damping torsion spring positioning foot insertion hole, and the damping torsion spring positioning foot insertion hole is a blind hole. The damping torsion spring is non-metallic, and the non-metallic material is polyurethane elastomer, high glass reinforced polyamide (PA), or silicone resin-based uncured rubber.

[0009] In another specific embodiment of the present invention, at the junction of the right end of the worm gear eccentric shaft and the left side of the worm gear, and on the outer wall of the circumferential direction surrounding the worm gear eccentric shaft, self-lubricating sleeve positioning blocks protruding from the surface of the worm gear eccentric shaft are formed at intervals. On the right end face of the self-lubricating sleeve, at the position corresponding to the self-lubricating sleeve positioning blocks, a number of self-lubricating sleeve positioning block mating notches are formed, equal to the number of self-lubricating sleeve positioning blocks. The self-lubricating sleeve mating notches mate with the self-lubricating sleeve positioning blocks. Furthermore, a self-lubricating sleeve opening is formed on the self-lubricating sleeve for the self-lubricating sleeve to tighten around the worm gear eccentric shaft by contraction and deformation when it is fitted onto the worm gear eccentric shaft.

[0010] In another specific embodiment of the present invention, the shape of the guide slide sliding cavity of the guide slide sliding guide seat matches the shape of the outer contour of the guide slide. A sliding sleeve through hole is opened in the middle of the guide slide, and a drive gear limiting claw guide groove extends upward and downward from the sliding sleeve through hole. A drive gear center hole is opened at the center of the drive gear, and a drive gear limiting claw extends from the upper and lower parts of the right side of the drive gear at the position corresponding to the drive gear limiting claw guide groove. The drive gear limiting claw probes into the drive gear limiting claw guide groove. The self-lubricating sleeve cooperates with the sliding sleeve through hole and the drive gear center hole.

[0011] In another specific embodiment of the present invention, an arcuate flange cavity is formed at the upper and lower parts of the guide slide sliding cavity and at corresponding positions, and a rectangular flange cavity is formed at the front and rear sides of the guide slide sliding cavity and at corresponding positions. The arcuate flange cavity and the rectangular flange cavity are positioned alternately. An arcuate flange is formed at the upper and lower parts of the guide slide and at corresponding positions, and a rectangular flange is formed at the front and rear sides of the guide slide and at corresponding positions. The arcuate flange and the rectangular flange are positioned alternately. The arcuate flange and the arcuate flange cavity slide together, and the rectangular flange and the rectangular flange cavity slide together.

[0012] In a further specific embodiment of the present invention, the output gear set includes an output gear seat and an output gear. A gear ring cavity is formed on the right side of the output gear seat. An internal gear ring is formed on the side wall of the gear ring cavity and around the circumference of the side wall of the gear ring cavity. A sealing gasket cavity recessed into the bottom wall of the gear ring cavity is formed at the center of the bottom wall of the gear ring cavity. A worm gear pivot support shaft support hole is opened at the center of the sealing gasket cavity. The output gear is formed at the center of the left side of the output gear seat. The output gear extends to the left side of the cover and a support shaft head extends at the center of the left end face of the output gear. The support shaft head is rotatably supported on the car seat in the use state. The left end of the worm gear pivot support shaft is supported in the worm gear pivot support shaft support hole. The drive gear meshes with the internal gear ring.

[0013] In a further specific embodiment of the present invention, an output gear clearance hole is provided in the center of the cover, and the output gear extends to the left side of the cover through the output gear clearance hole. An output gear positioning and backlash elimination sleeve is fitted on the output gear and at the junction of the output gear and the output gear seat. A sealing gasket is provided in the sealing gasket cavity, and a sealing ring is provided on the left side of the sealing gasket. The sealing ring makes the sealing gasket and the cavity wall of the sealing gasket cavity form a sealing relationship. A support shaft through hole is provided in the center of the sealing gasket, and the left end of the worm gear pivot support shaft passes through the support shaft through hole and is supported in the worm pivot support shaft support hole.

[0014] In yet another specific embodiment of the present invention, a set of cover fixing seats are spaced apart on the outer wall of the worm gear reducer housing. Each of the cover fixing seats has a cover fixing seat screw hole. A set of guide seat fixing ears extends spaced apart on the guide slide sliding guide seat at positions corresponding to the set of cover fixing seats. Each of the guide seat fixing ears has a guide seat fixing ear screw through hole at a position corresponding to the cover fixing seat screw hole. A set of cover fixing screws is provided on the cover at a position corresponding to the guide seat fixing ear screw hole on the set of guide seat fixing ears. The cover is fixed to the left side of the worm gear reducer housing by screwing the cover through the guide seat fixing ear screw through hole into the cover fixing seat screw hole. In the case of use, a cover fixing wing extends at the front and rear of the cover at corresponding positions. A fixing wing fixing hole is provided on the cover fixing wing. In the case of use, the fixing wing fixing hole is fixed to the car seat by fasteners at a position corresponding to the height adjustment mechanism in the car seat.

[0015] In yet another specific embodiment of the present invention, a worm support shaft head is formed at the rear end of the worm of the drive motor, and the worm support shaft head is rotatably supported on the cavity wall of the housing cavity; the drive motor is a DC motor with forward and reverse rotation functions.

[0016] The technical advantages of the present invention are as follows: By adding a sliding guide seat and slidably mounting the guide slide within the sliding cavity of the sliding guide seat, the existing structure of forming a sliding pair between the guide slide and the worm gear reducer housing is eliminated. This significantly simplifies the structure of the worm gear reducer housing and reduces manufacturing difficulty and cost. Furthermore, the self-lubricating sleeve, which rotates with the worm gear eccentric shaft, is fitted onto the worm gear eccentric shaft, thus optimizing the friction pair relationship in motion conversion by having the worm gear eccentric shaft drive the guide slide through the self-lubricating sleeve. The self-lubricating sleeve significantly reduces the frictional resistance of the guide slide, thereby improving transmission efficiency, reducing noise, minimizing energy loss, and extending overall service life. Finally, the good modular assembly of the components reduces volume, improves assembly efficiency, and lowers maintenance costs during use. Attached Figure Description

[0017] Figure 1 This is an assembly structure diagram of the present invention; Figure 2 for Figure 1 The diagram shows the structure of the worm gear as viewed from the right side. Figure 3 for Figure 1 The diagram shows the structure of the drive gear and output gear set viewed from the right side. Figure 4 for Figure 1 The diagram shows the cooperation relationship between the guide slide plate and the guide slide plate sliding guide seat; Figure 5 for Figure 1 A schematic diagram after assembly.

[0018] In the diagram: 1. Worm gear reducer housing; 11. Housing cavity; 111. Worm gear pivot support shaft; 1111. Damping torsion spring; 11111. Damping torsion spring arm; 11112. Damping torsion spring arm positioning foot; 12. Housing cover fixing seat; 121. Housing cover fixing seat screw hole; 13. Motor base; 2. Drive motor; 21. Worm; 211. Worm support shaft head; 3. Worm gear; 31. Worm gear eccentric shaft; 311. Worm gear eccentric shaft center hole; 312. Self-lubricating sleeve positioning block; 32. Worm gear shaft hole; 33. Damping torsion spring cavity; 34. Damping torsion spring arm embedded compensation groove; 35. Damping torsion spring positioning foot insertion hole; 4. Guide slide plate; 41. Sleeve through hole; 411. Drive gear limit claw guide groove; 42. 43. Guide slide arc flange; 5. Drive gear; 51. Drive gear center hole; 52. Drive gear limiting claw; 6. Output gear set; 61. Output gear seat; 611. Gear ring cavity; 612. Internal gear ring; 613. Sealing gasket cavity; 6131. ​​Worm gear pivot support shaft support hole; 6132. Sealing gasket; 61321. Sealing ring; 61322. Support shaft through hole; 62. Output gear; 621. Support shaft head; 622. Output gear positioning and backlash elimination sleeve; 7. Cover; 71. Output gear clearance hole; 72. Cover fixing screw; 73. Cover fixing wing; 731. Fixing hole for fixing wing; 8. Self-lubricating sleeve; 81. Self-lubricating sleeve positioning block mating notch; 82. Self-lubricating sleeve opening; 9. Guide slide sliding guide seat; 91. 911. Guide slide plate sliding cavity; 912. Guide slide plate arc flange cavity; 92. Guide slide plate rectangular flange cavity; 92. Guide seat fixing ear; 921. Guide seat fixing ear screw through hole. Detailed Implementation

[0019] In order to better understand the technical essence and beneficial effects of the present invention, the applicant provides a detailed description below by way of embodiments. However, the description of the embodiments is not intended to limit the present invention. Any formal but not substantive equivalent transformations made based on the concept of the present invention should be considered within the scope of the present invention.

[0020] In the following description, all directional or positional concepts involving up, down, left, right, front, and back are based on the current position. Figure 1The location and state are examples, and therefore should not be construed as a specific limitation on the technical solution provided by the present invention.

[0021] Please see Figure 1 The diagram shows a worm gear reducer housing 1; a drive motor 2 is shown, which is fixed to the worm gear reducer housing 1 in a horizontal position by means of a motor mount 13 formed on the worm gear reducer housing 1, and the drive motor shaft of the drive motor 2 is configured as a worm 21 and extends into (i.e., located) the housing cavity 11 of the worm gear reducer housing 1; a worm wheel 3 is shown, which is rotatably disposed in the aforementioned housing cavity 11 and meshes with the aforementioned worm 21, and a worm wheel eccentric shaft 31 is formed on the left side of the worm wheel 3. The diagram shows a guide plate 4, a drive gear 5, an output gear set 6, and a cover 7 arranged sequentially from right to left. The aforementioned worm gear eccentric shaft 31 engages with the guide plate 4 and the drive gear 5 sequentially from right to left. The right side of the drive gear 5 engages with the guide plate 4, and the drive gear 5 meshes with the output gear set 6. The output gear set 6 extends to the left side of the center position of the cover 7 and engages with the height adjustment mechanism inside the car seat in the use state. The cover 7 is fixed to the left side of the aforementioned worm gear reducer housing 1.

[0022] The key technical points of the technical solution provided by the present invention are as follows: the aforementioned electric height adjustment device for automobile seats also includes a self-lubricating sleeve 8 and a guide plate sliding guide seat 9. The self-lubricating sleeve 8 is sleeved on the aforementioned worm gear eccentric shaft 31 and rotates with the rotation of the worm gear eccentric shaft 31. The guide plate sliding guide seat 9 is located between the cover 7 and the worm gear reducer housing 1 on opposite sides and is fixed between the cover 7 and the worm gear reducer housing 1 when the cover 7 and the worm gear reducer housing 1 are fixed. The guide plate sliding guide seat 9 forms a guide sliding plate sliding cavity 91. The aforementioned guide plate 4 is slidably disposed in the guide plate sliding cavity 91. The aforementioned self-lubricating sleeve 8 cooperates with the worm gear eccentric shaft 31, the guide plate 4, and the drive gear 5. This cooperation is essentially a friction cooperation.

[0023] In this embodiment, the aforementioned worm gear reducer housing 1 and worm gear 3 are preferably, but not absolutely limited to, made of plastic. The aforementioned self-lubricating sleeve 8 is preferably, but not absolutely limited to, using a high-strength copper alloy (such as aluminum bronze) as the base, with a fixed lubricant such as graphite or molybdenum disulfide embedded within it.

[0024] The aforementioned self-lubricating sleeve 8, acting as an intermediate bushing, is fitted onto the worm gear eccentric shaft 31, transferring the sliding friction that originally occurred between the worm gear eccentric shaft 31 and the drive gear 5 and the guide slide plate 4 to the self-lubricating sleeve 8 and the drive component. Because the self-lubricating sleeve 8 is self-lubricating, it can provide a stable and low-friction sliding interface with little or no external grease. In terms of transmission efficiency and wear resistance, the material constituting the self-lubricating sleeve 8 has a low coefficient of friction and good anti-friction properties, effectively reducing energy loss during the reciprocating sliding process of the eccentric component. This allows the driving force of the drive motor 1 to be transmitted to the output gear set 6 more efficiently, improving the mechanical efficiency of the electric height adjustment device for the car seat. Furthermore, the self-lubricating sleeve 8, as a replaceable and easily replaceable component, bears the majority of the friction, which is much more economical than the direct wear of the more valuable and structurally complex eccentric block or worm gear shaft 31, thus significantly extending the service life of the core components.

[0025] See you later Figure 1 A worm gear pivot support shaft 111 is provided (i.e. "fixed") in the housing cavity 11 of the aforementioned worm gear reducer housing 1 and at the center of the bottom wall of the housing cavity 11, perpendicular to the bottom wall of the housing cavity. The aforementioned worm gear 3 is rotatably mounted on the worm gear pivot support shaft 111 through a worm gear shaft hole 32 formed at its center. A worm gear eccentric shaft center hole 311 is provided at the axial center of the aforementioned worm gear eccentric shaft 31 and at the position corresponding to the aforementioned worm gear shaft hole 32. The left end of the aforementioned worm gear pivot support shaft 111 is supported on the aforementioned output gear set 6 after passing through the worm gear shaft hole 32 and the worm gear eccentric shaft center hole 311 in sequence.

[0026] Please see Figure 2 And combined Figure 1 A damping torsion spring 1111 is fitted onto the aforementioned worm gear pivot bearing shaft 111 at a position corresponding to the right side of the aforementioned worm gear 3. A damping torsion spring cavity 33 is formed at the center of the right side of the aforementioned worm gear 3, recessed into the right side surface of the worm gear 3. A damping torsion spring arm insertion compensation groove 34 and a damping torsion spring positioning foot insertion hole 35 are formed on the right side of the worm gear 3. The damping torsion spring 1111 cooperates with the damping torsion spring cavity 33, and the damping torsion spring arm 11111 of the damping torsion spring 1111 engages with the damping torsion spring 1111. The damping torsion spring arm is fitted into the compensation groove 34, and the damping torsion spring arm positioning foot 11112 formed at the end of the damping torsion spring arm 11111 is fitted into the damping torsion spring positioning foot insertion hole 35, and the damping torsion spring positioning foot insertion hole 35 is a blind hole; in this embodiment, the aforementioned damping torsion spring 1111 is non-metallic, and the non-metallic material is preferably polyurethane elastomer, high glass fiber reinforced polyamide (PA) or silicone resin-based uncured rubber. In this embodiment, a damping torsion spring 1111 made of silicone resin-based uncured rubber is selected.

[0027] When the drive motor 2 operates and causes the worm gear 21 to rotate, the damping element, namely the damping torsion spring 1111, applies frictional resistance. This frictional resistance forms a damping torque opposite to the direction of motion, making the movement of the worm wheel 3 smooth and gentle, avoiding impacts, vibrations, or bouncing caused by the start-stop of the drive motor 2 or sudden load changes.

[0028] Depend on Figure 1 As shown, at the junction of the right end of the aforementioned worm gear eccentric shaft 31 and the left side of the aforementioned worm gear 3 (i.e., the base of the "worm gear eccentric shaft 31") and on the outer wall of the circumference of the aforementioned worm gear eccentric shaft 31, self-lubricating sleeve positioning blocks 312 protruding from the surface of the worm gear eccentric shaft 31 are formed at intervals. On the right end face of the aforementioned self-lubricating sleeve 8 and at the position corresponding to the self-lubricating sleeve positioning blocks 312, a number of self-lubricating sleeve positioning block mating notches 81 equal to the number of self-lubricating sleeve positioning blocks 312 are formed. The self-lubricating sleeve positioning block mating notches 81 mate with the self-lubricating sleeve positioning blocks 312. Furthermore, a self-lubricating sleeve opening 82 is formed on the self-lubricating sleeve 8 for the self-lubricating sleeve 8 to tighten around the worm gear eccentric shaft 31 by contraction and deformation when it is fitted onto the worm gear eccentric shaft 31.

[0029] Please see Figure 4 And combined Figure 1 The shape of the guide slide cavity outline (i.e., "outline") of the guide slide slide cavity 91 of the aforementioned guide slide slide guide seat 9 matches the shape of the outer outline of the aforementioned guide slide 4. A sliding sleeve through hole 41 is opened in the middle of the guide slide 4. A drive gear limiting claw guide groove 411 extends upward and downward from the sliding sleeve through hole 41. A drive gear center hole 51 is opened at the center of the aforementioned drive gear 5. A drive gear limiting claw 52 extends from the upper and lower parts of the right side of the drive gear 5 and at the position corresponding to the aforementioned drive gear limiting claw guide groove 411. The drive gear limiting claw 52 extends into the drive gear limiting claw guide groove 411. The aforementioned self-lubricating sleeve 8 cooperates with the aforementioned sliding sleeve through hole 41 and drive gear center hole 51.

[0030] At the upper and lower parts of the aforementioned guide slide sliding cavity 91, and at corresponding positions, there is a guide slide arc-shaped flange cavity 911. At the front and rear sides of the guide slide sliding cavity 91, and at corresponding positions, there is a guide slide rectangular flange cavity 912. The guide slide arc-shaped flange cavity 911 and the guide slide rectangular flange cavity 912 are in a one-to-one positional relationship. At the upper and lower parts of the aforementioned guide slide 4, and at corresponding positions, there is a guide slide arc-shaped flange 42. At the front and rear sides of the guide slide 4, and at corresponding positions, there is a guide slide rectangular flange 43. The guide slide arc-shaped flange 42 and the guide slide rectangular flange 43 are in a one-to-one positional relationship. The guide slide arc-shaped flange 42 slides with the guide slide arc-shaped flange cavity 911, and the guide slide rectangular flange 43 slides with the guide slide rectangular flange cavity 912.

[0031] Please see Figure 3 And combined Figure 1 The aforementioned output gear set 6 includes an output gear seat 61 and an output gear 62. A gear ring cavity 611 is formed on the right side of the output gear seat 61. An internal gear ring 612 is formed on the side wall of the gear ring cavity 611 and around the side wall in the circumferential direction. A sealing gasket cavity 613 is formed at the center of the bottom wall of the gear ring cavity 611, recessed into the bottom wall of the gear ring cavity. A worm gear pivot bearing shaft support hole 6131 is formed at the center of the sealing gasket cavity 613. The output gear 62 is located at the center of the left side of the output gear seat 61. The output gear 62 extends to the left side of the aforementioned cover 7 and a support shaft head 621 extends at the center of the left end face of the output gear 62. The support shaft head 621 is rotatably supported on the car seat in the use state. The left end of the aforementioned worm gear pivot support shaft 111 is supported in the aforementioned worm pivot support shaft support hole 6131. ​​The aforementioned drive gear 5 meshes with the aforementioned internal gear ring 612.

[0032] Please see Figure 1 , Figure 3 and Figure 5An output gear clearance hole 71 is provided in the center of the aforementioned cover 7. The aforementioned output gear 62 extends to the left side of the cover 7 through the output gear clearance hole 71. An output gear positioning and backlash elimination sleeve 622 is fitted on the output gear 62 and at the junction of the output gear 62 and the output gear seat 61. A sealing gasket 6132 is provided in the aforementioned sealing gasket cavity 613, and a sealing ring 61321 is provided on the left side of the sealing gasket 6132. The sealing ring 61321 makes the sealing gasket 6132 and the cavity wall (cavity bottom wall) of the sealing gasket cavity 613 form a sealing relationship. A support shaft through hole 61322 is provided in the center of the sealing gasket 6132. The left end of the aforementioned worm gear pivot support shaft 111 passes through the support shaft through hole 61322 and is supported in the aforementioned worm gear pivot support shaft support hole 6131.

[0033] Depend on Figure 1 As shown, a set of cover fixing seats 12 are spaced apart on the outer wall of the aforementioned worm gear reducer housing 1. Each of the cover fixing seats 12 has a cover fixing seat screw hole 121. On the aforementioned guide slide sliding guide seat 9, a set of guide seat fixing ears 92 extend at intervals corresponding to the set of cover fixing seats 12. On the set of guide seat fixing ears 92, a guide seat fixing ear screw through hole 921 is provided at the position corresponding to the cover fixing seat screw hole 121. On the aforementioned cover 7, the guide seat fixing ear screw holes corresponding to the set of guide seat fixing ears 92 are also provided. A set of cover fixing screws 72 is provided at position 921. The cover 7 is fixed to the left side of the worm gear reducer housing 1 by screwing the cover fixing screws 72 through the guide seat fixing ear screw through hole 921 into the cover fixing seat screw hole 121. The cover 7 is fixed to the left side of the worm gear reducer housing 1 by screwing the cover fixing screws 72 through the guide seat fixing ear screw through hole 921. The cover fixing wing 73 extends from the front and rear of the cover 7 and at corresponding positions. The cover fixing wing fixing hole 731 is provided with fixing wing fixing hole 731. In use, the fixing wing fixing hole 731 is fixed to the car seat by fasteners at the position corresponding to the height adjustment mechanism in the car seat.

[0034] See you later Figure 1 A worm support shaft head 211 is formed at the rear end of the worm 21 of the aforementioned drive motor 2, and the worm support shaft head 211 is rotatably supported on the cavity wall of the aforementioned housing cavity 11.

[0035] In this embodiment, the aforementioned drive motor 2 is a brushed DC motor with forward and reverse rotation functions. However, if a brushless DC motor is used instead of a brushed DC motor by means of a form change, then it should be considered equivalent.

[0036] Applicant combined Figures 1 to 5To describe the operation of this invention, it should first be noted that: Typically, the control switch for the electric height adjustment device of a car seat is located on the side of the seat, and this control switch can be either manual or automatic. Although the control methods differ, the function and principle are the same. For manual adjustment, the seat height is adjusted using a wrench or knob; for automatic adjustment, the seat height is adjusted using a button. Taking the driver's seat as an example, the adjustment principle is to ensure that the driver's line of sight is at a suitable distance from the instrument panel, that the pedals can be easily reached, and that the knees and feet are naturally bent, thereby improving driving comfort and safety.

[0037] The drive motor 2 operates, driving the worm gear 21, which in turn drives the worm wheel 3. The worm wheel 3's eccentric shaft 31 drives the self-lubricating sleeve 8. Since the self-lubricating sleeve 8, fitted onto and driven by the worm wheel eccentric shaft 31, engages with the sliding sleeve through hole 41, the self-lubricating sleeve 8 causes the guide slide plate 4 to move back and forth (i.e., slide back and forth). This means the rectangular flange 43 of the guide slide plate 4 corresponds to the rectangular flange cavity 912 of the guide slide plate sliding cavity 91 of the guide slide plate sliding guide seat 9, causing the guide slide plate 4 to move back and forth (i.e., "move back and forth"). Because the arcuate flange 42 of the guide slide plate 4 corresponds to the arcuate flange cavity 911 of the guide slide plate sliding cavity 91, the guide slide plate 4 as a whole moves along an elliptical trajectory. Simultaneously, the self-lubricating sleeve 8 drives the drive gear 5 to revolve around the internal gear ring 612 on the cavity wall of the gear ring cavity 611 of the output gear set 6. Simultaneously, a pair of drive gear limiting claws 52 on the drive gear 5 move up and down in the drive gear limiting claw guide groove 411, thereby limiting the rotation of the drive gear 5. During its revolution, the drive gear 5 drives the output gear seat 61 to rotate through the internal gear ring 612, and the output gear 62 rotates accordingly, driving the height adjustment mechanism inside the car seat to raise the car seat to the required level, which substantially meets the aforementioned requirements. Because the structure of this invention has a strong self-locking property for the output gear set 6, the seat can be reliably locked in the raised position. If it is necessary to lower the car seat, that is, to adjust the car seat in the opposite direction (lower) relative to the aforementioned raising, the lowering adjustment process is the reverse of the aforementioned process, depending on the reverse operation of the drive motor 2. Specifically, it is simply a matter of reversing the operation of the manual or automatic adjustment control switch relative to the aforementioned operation, and therefore the applicant will not elaborate further.

[0038] In summary, the technical solution provided by this invention makes up for the shortcomings of the prior art, successfully completes the invention task, and accurately realizes the technical effects described by the applicant in the above technical effects column.

Claims

1. An electric height adjustment device for a car seat, comprising a worm gear reducer housing (1); a drive motor (2) fixed to the worm gear reducer housing (1), the drive motor shaft of the drive motor (2) being configured as a worm (21) and extending into the housing cavity (11) of the worm gear reducer housing (1); a worm wheel (3) rotatably disposed within the housing cavity (11) and meshing with the worm (21), an eccentric shaft (31) being formed on the left side of the worm wheel (3); and a guide slide plate arranged sequentially from right to left. 4) A drive gear (5), an output gear set (6), and a housing cover (7), wherein the worm gear eccentric shaft (31) engages with the guide slide plate (4) and the drive gear (5) sequentially from right to left, and the right side of the drive gear (5) engages with the guide slide plate (4) and the drive gear (5) meshes with the output gear set (6), the output gear set (6) extends to the left side of the center position of the housing cover (7) and engages with the height adjustment mechanism inside the car seat in the use state, the housing cover (7) is fixed to the left side of the worm gear reducer housing (1), characterized in that: It also includes a self-lubricating sleeve (8) and a guide plate sliding guide seat (9). The self-lubricating sleeve (8) is sleeved on the worm gear eccentric shaft (31) and rotates with the rotation of the worm gear eccentric shaft (31). The guide plate sliding guide seat (9) is located between the cover (7) and the worm gear reducer housing (1) on opposite sides and is fixed between the cover (7) and the worm gear reducer housing (1) when the cover (7) and the worm gear reducer housing (1) are fixed. The guide plate sliding guide seat (9) forms a guide sliding plate sliding cavity (91). The guide plate (4) is slidably disposed in the guide plate sliding cavity (91). The self-lubricating sleeve (8) cooperates with the worm gear eccentric shaft (31), the guide plate (4), and the drive gear (5).

2. The electric height adjustment device for automobile seats according to claim 1, characterized in that: A worm gear pivot support shaft (111) is provided in the housing cavity (11) of the worm gear reducer housing (1) and at the center of the bottom wall of the housing cavity (11) in a state perpendicular to the bottom wall of the housing cavity. The worm gear (3) is rotatably mounted on the worm gear pivot support shaft (111) through a worm gear shaft hole (32) formed at its center. A worm gear eccentric shaft center hole (311) is provided at the axial center of the worm gear eccentric shaft (31) and at the position corresponding to the worm gear shaft hole (32). The left end of the worm gear pivot support shaft (111) is supported on the output gear set (6) after passing through the worm gear shaft hole (32) and the worm gear eccentric shaft center hole (311) in sequence.

3. The electric height adjustment device for automobile seats according to claim 2, characterized in that: A damping torsion spring (1111) is fitted on the worm gear pivot support shaft (111) at a position corresponding to the right side of the worm gear (3). A damping torsion spring cavity (33) is formed in the center of the right side of the worm gear (3), recessed into the right side surface of the worm gear (3). A damping torsion spring arm embedding compensation groove (34) and a damping torsion spring positioning foot insertion hole (35) are formed on the right side of the worm gear (3). The damping torsion spring (1111) cooperates with the damping torsion spring cavity (33). The damping torsion spring arm (11111) of the damping torsion spring (1111) is fitted into the damping torsion spring arm embedded in the compensation groove (34), and the damping torsion spring arm positioning foot (11112) at the end of the damping torsion spring arm (11111) is embedded in the damping torsion spring positioning foot insertion hole (35), and the damping torsion spring positioning foot insertion hole (35) is a blind hole; the damping torsion spring (1111) is non-metallic, and the non-metallic material is polyurethane elastomer, high glass reinforced polyamide or silicone resin-based uncured rubber.

4. The electric height adjustment device for automobile seats according to claim 1, characterized in that: At the junction of the right end of the worm gear eccentric shaft (31) and the left side of the worm gear (3), and on the outer wall of the worm gear eccentric shaft (31) in the circumferential direction, there are self-lubricating sleeve positioning blocks (312) protruding from the surface of the worm gear eccentric shaft (31) at intervals. On the right end face of the self-lubricating sleeve (8) and at the position corresponding to the self-lubricating sleeve positioning blocks (312), there are self-lubricating sleeve positioning block mating notches (81) in the same number as the number of self-lubricating sleeve positioning blocks (312). The self-lubricating sleeve positioning block mating notches (81) mate with the self-lubricating sleeve positioning blocks (312). Furthermore, a self-lubricating sleeve opening (82) is formed on the self-lubricating sleeve (8) for the self-lubricating sleeve (8) to tighten around the worm gear eccentric shaft (31) by contraction and deformation when it is fitted onto the worm gear eccentric shaft (31).

5. The electric height adjustment device for automobile seats according to claim 1, characterized in that: The shape of the guide slide sliding cavity (91) of the guide slide sliding guide seat (9) matches the shape of the outer contour of the guide slide (4). A sliding sleeve through hole (41) is opened in the middle of the guide slide (4). A drive gear limiting claw guide groove (411) extends upward and downward from the sliding sleeve through hole (41). A drive gear center hole (51) is opened at the center of the drive gear (5). A drive gear limiting claw (52) extends from the upper and lower parts of the right side of the drive gear (5) and at the position corresponding to the drive gear limiting claw guide groove (411). The drive gear limiting claw (52) inserts into the drive gear limiting claw guide groove (411). The self-lubricating sleeve (8) cooperates with the sliding sleeve through hole (41) and the drive gear center hole (51).

6. The electric height adjustment device for automobile seats according to claim 5, characterized in that: A guide slide arc-shaped flange cavity (911) is formed at the upper and lower parts of the guide slide cavity (91) at corresponding positions. A guide slide rectangular flange cavity (912) is formed at the front and rear sides of the guide slide cavity (91) at corresponding positions. The guide slide arc-shaped flange cavity (911) and the guide slide rectangular flange cavity (912) are in a one-to-one positional relationship. A guide slide arc-shaped flange (42) is formed at the upper and lower parts of the guide slide (4) at corresponding positions. A guide slide rectangular flange (43) is formed at the front and rear sides of the guide slide (4) at corresponding positions. The guide slide arc-shaped flange (42) and the guide slide rectangular flange (43) are in a one-to-one positional relationship. The guide slide arc-shaped flange (42) slides with the guide slide arc-shaped flange cavity (911), and the guide slide rectangular flange (43) slides with the guide slide rectangular flange cavity (912).

7. The electric height adjustment device for automobile seats according to claim 2, characterized in that: The output gear set (6) includes an output gear seat (61) and an output gear (62). A gear ring cavity (611) is formed on the right side of the output gear seat (61). An internal gear ring (612) is formed on the side wall of the gear ring cavity (611) and around the circumference of the side wall of the gear ring cavity. A sealing gasket cavity (613) recessed into the bottom wall of the gear ring cavity (611) is formed at the center position. A worm gear pivot bearing shaft support hole (6131) is opened at the center position of the sealing gasket cavity (613). An output gear (62) is located at the center of the left side of the output gear seat (61). The output gear (62) extends to the left side of the cover (7) and a support shaft head (621) extends at the center of the left end face of the output gear (62). The support shaft head (621) is rotatably supported on the car seat in use. The left end of the worm gear pivot support shaft (111) is supported in the worm pivot support shaft support hole (6131). The drive gear (5) meshes with the internal gear ring (612).

8. The electric height adjustment device for automobile seats according to claim 7, characterized in that: An output gear clearance hole (71) is provided in the center of the cover (7). The output gear (62) extends through the output gear clearance hole (71) to the left side of the cover (7). An output gear positioning clearance elimination sleeve (622) is fitted on the output gear (62) and at the junction of the output gear (62) and the output gear seat (61). A sealing gasket (6132) is provided in the sealing gasket cavity (613), and a sealing ring (61321) is provided on the left side of the sealing gasket (6132). The sealing ring (61321) makes the sealing gasket (6132) and the cavity wall of the sealing gasket cavity (613) form a sealing relationship. A support shaft through hole (61322) is provided in the center of the sealing gasket (6132). The left end of the worm gear pivot support shaft (111) passes through the support shaft through hole (61322) and is supported in the worm gear pivot support shaft support hole (6131).

9. The electric height adjustment device for automobile seats according to claim 1, characterized in that: A set of cover fixing seats (12) are spaced apart on the outer wall of the worm gear reducer housing (1). Each of the cover fixing seats (12) has a cover fixing seat screw hole (121). A set of guide seat fixing ears (92) extends from the guide slide sliding guide seat (9) at intervals corresponding to the set of cover fixing seats (12). Each of the guide seat fixing ears (92) has a guide seat fixing ear screw through hole (921) at the position corresponding to the cover fixing seat screw hole (121). The cover (7) has guide seat fixing ear screw holes (92) corresponding to the set of guide seat fixing ears (92). A set of cover fixing screws (72) is provided at position 921. The cover (7) is fixed to the left side of the worm gear reducer housing (1) by screwing the cover fixing screws (72) through the guide seat fixing ear screw through hole (921) into the cover fixing seat screw hole (121). The cover (7) is fixed to the left side of the worm gear reducer housing (1). There is a cover fixing wing (73) extending from the front and rear of the cover (7) at corresponding positions. The cover fixing wing (73) is provided with a fixing wing fixing hole (731). In the use state, the fixing wing fixing hole (731) is fixed to the car seat by fasteners at the position corresponding to the height adjustment mechanism in the car seat.

10. The electric height adjustment device for automobile seats according to claim 1, characterized in that: A worm support shaft head (211) is formed at the rear end of the worm (21) of the drive motor (2), and the worm support shaft head (211) is rotatably supported on the cavity wall of the housing cavity (11); the drive motor (2) is a DC motor with forward and reverse rotation function.

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