Automobile seat horizontal drive

Abstract

The utility model provides a horizontal driver of car seat, including reduction gearbox, the reduction gearbox is closed through left and right box body and is equipped with worm wheel and worm in cavity, worm wheel is equipped with screw rod thread, the both sides of reduction gearbox are equipped with screw rod hole, the position department of worm of reduction gearbox is closed state, the worm wheel includes cylindrical wheel body, the both ends of wheel body form gyration end surface and axle head, the middle section position of wheel body is provided with the worm wheel tooth of meshing with worm and the worm wheel tooth end and wheel body end face are intervally set, still include wear -resisting ring, wear -resisting ring includes radial support ring, and the axial support spare of supporting between wheel body end face and reduction gearbox cavity inner wall, the cavity end face shape of axial support spare and reduction gearbox both ends corresponds and is non - gyration body modelling, the outer edge of axial support spare and cavity end face adapts to limit the circumferential degree of freedom of wear -resisting ring, the utility model has the advantages of long service life, low working noise.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts, specifically to a car seat leveling drive. Background Technology

[0002] The fore-and-aft adjustment of electric seats relies on a horizontal drive. Existing horizontal drives use a worm gear to reduce speed and then cooperate with a lead screw to achieve displacement. Since the load is applied to the worm gear when the gearbox is working, and the axial support of the worm gear depends on the gearbox, there will inevitably be friction between the end of the worm gear and the inner wall of the gearbox, making it more prone to local wear at the stressed end.

[0003] To address the aforementioned issues, the applicant filed an application on August 7, 2023, disclosing a highly stable gearbox, comprising a gearbox body, a worm gear located within the gearbox body, and a worm cooperating with the worm gear transmission. The gearbox body includes a left housing and a right housing. A threaded hole is formed in the axial direction of the worm gear. A lead screw hole coaxially arranged with the threaded hole is formed on the gearbox body. The worm gear includes a wheel body and shoulders located at both ends of the wheel body. The outer diameter of the shoulder is smaller than the outer diameter of the wheel body. A wear-resistant ring is fitted on the shoulder. The wear-resistant ring includes a radial support ring supported between the outer cylindrical wall of the shoulder and the inner wall of the lead screw hole, an axial support ring supported between the wheel body and the inner wall of the gearbox, and a limiting ring arranged towards the lead screw hole. The limiting ring is located inside the lead screw hole and coaxially arranged with it.

[0004] In recent years, user feedback has indicated that some OEMs have reported noticeable noise during operation. After investigation by the applicant's R&D department, it was found that the gearbox, designed with maintenance in mind, has an open structure corresponding to the worm gear. This structure causes noise to be generated when the worm and worm wheel are working. When the product is used in gasoline vehicles, this noise is masked by engine noise or external noise, making it difficult to detect. However, with the increasing popularity of electric vehicles and improved sound insulation in recent years, the quietness inside vehicles has greatly improved, making the noise generated by the gearbox more noticeable to users. Furthermore, the circumferential positioning part of the axial support ring experiences asymmetrical stress on the wear-resistant ring and the left and right housings under stress, resulting in concentrated stress and potential circumferential positioning failure. Additionally, the left and right housings of the drive unit are bolted together, requiring tapping during manufacturing and screwing the bolts in during assembly. The small size and spacing of adjacent bolts necessitate manual tightening, hindering assembly efficiency. Utility Model Content

[0005] Based on the above problems, the purpose of this utility model is to provide a car seat leveling actuator with a long service life and low operating noise.

[0006] To address the above problems, the following technical solution is provided: A horizontal drive for an automotive seat, comprising a reduction gearbox, wherein the reduction gearbox is formed by a left and a right housing fastened together, and a worm gear and a worm are provided within the cavity. The worm gear has a lead screw thread at its center, and lead screw holes coaxially arranged with the lead screw thread are provided on both sides of the reduction gearbox. The reduction gearbox housing is closed at the position corresponding to the worm, making the entire reduction gearbox a closed structure. The worm gear includes a cylindrical wheel body that meshes with the worm, and the two ends of the wheel body form rotating end faces. The gear body includes a shaft head, a worm gear tooth that meshes with a worm, and the ends of the worm gear teeth are spaced apart from the end face of the gear body; it also includes a wear-resistant ring, which includes a radial support ring supported between the outer cylindrical wall of the shaft head and the inner wall of the lead screw hole, and an axial support member supported between the end face of the gear body and the inner wall of the gearbox cavity. The axial support member corresponds to the shape of the cavity end faces at both ends of the gearbox and has a non-rotational shape. The outer edge of the axial support member is adapted to restrict the circumferential freedom of the wear-resistant ring.

[0007] The present invention is further configured such that the lead screw hole passes through the fastening surfaces of the left and right housings; the left housing is provided with a riveting post on the side facing the right housing; the right housing is provided with a riveting hole for passing through the riveting post, and after the left and right housings are fastened together, the end of the riveting post is riveted to the right housing by upsetting.

[0008] The present invention is further configured such that both the left and right boxes are made of metal.

[0009] The present invention is further configured such that the worm is provided with support shafts at both ends, and one of the support shafts has a transmission hole exposed to the gearbox on its end face, and an annular oil reservoir ring is provided at the end face of the junction of the worm and the support shaft.

[0010] The present invention is further provided that the inner ring wall and the outer ring wall of the oil storage ring are provided with support ribs arranged at intervals along their axial direction, and the top surface of the support ribs is lower than the ring opening of the oil storage ring.

[0011] The present invention is further configured such that the axial support member has four apex corners in the projection direction of the lead screw hole axis, and anti-rotation grooves for accommodating the apex corners are provided at both ends of the left and right housings.

[0012] The present invention is further configured such that there are four riveting posts, located at the four top corners of the side of the left housing facing the right housing.

[0013] In this embodiment, the wear-resistant ring is made of polyoxymethylene (POM) or polybutylene terephthalate (PBT).

[0014] The present invention is further configured such that positioning protrusions are provided at both ends of the gearbox facing the lead screw hole in the axial direction; shock-absorbing rubber sleeves are fitted on the end faces and side positions of both ends of the gearbox, and the shock-absorbing rubber sleeves are provided with positioning recesses for accommodating the positioning protrusions; the shock-absorbing rubber sleeves are provided with through holes coaxially opened with the lead screw hole.

[0015] The above structure can improve the fixing firmness between the shock-absorbing rubber sleeve and the gearbox.

[0016] The present invention is further configured such that the positioning protrusions are arranged in a circle with the center of the lead screw hole as the center, and are arranged corresponding to the four apex positions of the gearbox end face.

[0017] The present invention is further configured such that the gearbox housing corresponding to the worm gear position is convex upwards, and the shock-absorbing rubber sleeve has a thickened area on the side of the gearbox corresponding to the worm gear position, and the thickened area is at the same height as the convex position.

[0018] The beneficial effects of this utility model are:

[0019] 1. The wear-resistant ring achieves circumferential positioning by adapting to the end faces of the cavities at both ends of the gearbox through axial support components. Under load, stress is more dispersed, resulting in a longer service life and effectively reducing noise. With the optimization and improvement of the internal structure and the filling of long-life grease, maintenance-free operation can be achieved, eliminating the existing open-type oil inlet and preventing grease loss. One particularly important point is that when using existing technology in fuel vehicles, engine noise is often higher than drive noise and is not easily noticed. However, with the popularization of electric vehicles, the quietness of the interior space has been greatly improved, so drive noise will become extremely noticeable. Therefore, the closed structure can effectively reduce noise and improve the user experience.

[0020] 2. The left and right boxes are fixed by riveting, which is convenient for production and assembly and has a high degree of firmness, effectively simplifying the production process while ensuring service life.

[0021] 3. The metal enclosure ensures strength while effectively isolating noise;

[0022] 4. It can increase the amount of grease stored at the end of the worm gear, achieving long-term lubrication; after setting the oil reservoir ring, the radial support effect at the end of the worm gear will be deteriorated, so setting the support rib can compensate for its strength.

[0023] 5. The anti-rotation groove and the top corner effectively improve the positioning accuracy and support rigidity, constraining the two degrees of freedom of the axial support in the direction of the screw hole axis while restricting its circumferential degree of freedom.

[0024] 6. Riveting can achieve the same stability as screw fixing;

[0025] 7. The positioning protrusion can improve the fixing firmness between the shock-absorbing rubber sleeve and the gearbox. The thickened area can improve the buffering performance at this position and also help improve the sound insulation and noise reduction effect. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0027] Figure 2 This utility model Figure 1 A magnified structural diagram of part A.

[0028] Figure 3 This utility model Figure 2 A schematic diagram of the explosion structure.

[0029] Figure 4 This utility model Figure 3 A magnified structural diagram of part B.

[0030] The labels in the diagram have the following meanings: 10-Gearbox; 11-Left housing; 111-Riveting post; 12-Right housing; 121-Riveting hole; 13-Cavity; 14-Lead screw hole; 15-Anti-rotation groove; 16-Positioning protrusion; 20-Worm gear; 21-Lead screw thread; 22-Wheel body; 221-Rotating end face; 222-Shaft head; 223-Worm gear tooth; 30-Worm; 31-Support shaft; 32-Transmission hole; 33-Oil reservoir ring; 331-Support rib; 40-Wear-resistant ring; 41-Radial support ring; 42-Axial support component; 421-Peak angle; 50-Shock-absorbing rubber sleeve; 51-Positioning recess; 52-Through hole; 53-Thickened area. Detailed Implementation

[0031] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0032] refer to Figures 1 to 4 ,like Figures 1 to 4A car seat horizontal actuator is shown, including a reduction gearbox 10. The reduction gearbox 10 is formed by a left housing 11 and a right housing 12 fastened together, and a worm gear 20 and a worm 30 are provided in the cavity 13. The worm gear 20 has a lead screw thread 21 at its center. The reduction gearbox 10 has lead screw holes 14 on both sides, which are coaxially arranged with the lead screw thread 21. The housing of the reduction gearbox 10 is closed at the position corresponding to the worm 30, making the entire reduction gearbox 10 a closed structure. The worm gear 20 includes a cylindrical wheel body 22 that meshes with the worm 30. The wheel body 22 has a rotating end face 221 and a shaft head 222 at both ends. The wheel body 22 has a worm gear tooth 223 that meshes with the worm 30 at the middle section, and the end of the worm gear tooth 223 is spaced apart from the end face of the wheel body 22. It also includes a wear-resistant ring 40, which includes a radial support ring 41 supported between the outer cylindrical wall of the shaft head 222 and the inner wall of the lead screw hole 14, and an axial support member 42 supported between the end face of the wheel body 22 and the inner wall of the cavity 13 of the gearbox 10. The axial support member 42 corresponds to the shape of the end face of the cavity 13 at both ends of the gearbox 10 and has a non-rotational shape. The outer edge of the axial support member 42 is adapted to restrict the circumferential degree of freedom of the wear-resistant ring 40.

[0033] In the above structure, the wear-resistant ring 40 is circumferentially positioned by adapting to the end faces of the cavities 13 at both ends of the gearbox 10 through the axial support member 42. Under load, the stress is more dispersed, the service life is longer, and noise is effectively reduced. With the optimization and improvement of the internal structure and the filling of long-life grease, maintenance-free operation can be achieved, eliminating the existing open-type oil inlet and preventing grease loss. One particularly important point is that when using existing technology in fuel vehicles, the engine noise is often higher than the drive noise and is not easily noticed. However, with the popularization of electric vehicles, the quietness of the interior space has been greatly improved, so the drive noise will become extremely noticeable. Therefore, the closed structure can effectively reduce noise and improve the user experience.

[0034] In this embodiment, the lead screw hole 14 passes through the fastening surfaces of the left housing 11 and the right housing 12; the left housing 11 is provided with a riveting post 111 on the side facing the right housing 12; the right housing 12 is provided with a riveting hole 121 for passing through the riveting post 111; after the left housing 11 and the right housing 12 are fastened together, the end of the riveting post 111 is riveted to the right housing 12 by upsetting.

[0035] In the above structure, the left box 11 and the right box 12 are fixed by riveting, which is convenient for production and assembly and has high firmness, effectively simplifying the production process while ensuring service life.

[0036] In this embodiment, both the left box 11 and the right box 12 are made of metal.

[0037] The above structure ensures strength while effectively isolating noise.

[0038] In this embodiment, the worm gear 30 is provided with support shafts 31 at both ends, and one of the support shafts 31 has a transmission hole 32 exposed to the gearbox 10 on its end face. The end face of the worm gear 30 at the junction with the support shaft 31 is provided with an annularly opened oil storage ring 33.

[0039] The above structure can increase the amount of grease stored at the end of the worm gear 30, thus achieving long-term lubrication.

[0040] In this embodiment, the inner and outer ring walls of the oil storage ring 33 are provided with support ribs 331 arranged at intervals along their axial direction, and the top surface of the support ribs 331 is lower than the ring opening of the oil storage ring 33.

[0041] In the above structure, the radial support effect at the end of the worm 30 will be worse after the oil storage ring 33 is set. Therefore, the support rib 331 can compensate for its strength.

[0042] In this embodiment, the axial support member 42 is provided with four apex corners 421 in the projection direction of the axis of the lead screw hole 14, and anti-rotation grooves 15 for accommodating the apex corners 421 are provided at both ends of the left housing 11 and the right housing 12.

[0043] In the above structure, the axial support member 42 is constrained in two degrees of freedom in the direction of the screw hole 14 axis, while its circumferential degree of freedom is also restricted.

[0044] In this embodiment, there are four riveting posts 111, located at the four apex positions 421 on the side of the left housing 11 facing the right housing 12.

[0045] The above structure can achieve the same stability as screw fixing.

[0046] In this embodiment, the wear-resistant ring 40 is made of polyoxymethylene (POM) or polybutylene terephthalate (PBT).

[0047] In the above structure, the wear-resistant ring 40 is preferably made of polybutylene terephthalate (PBT).

[0048] In this embodiment, the gearbox 10 has positioning protrusions 16 at both ends facing the lead screw hole 14 in the axial direction; the end faces and side faces of the gearbox 10 are fitted with shock-absorbing rubber sleeves 50, the shock-absorbing rubber sleeves 50 have positioning recesses 51 for accommodating the positioning protrusions 16; the shock-absorbing rubber sleeves 50 have through holes 52 that are coaxially opened with the lead screw hole 14.

[0049] The above structure can improve the fixing firmness between the shock-absorbing rubber sleeve 50 and the gearbox 10.

[0050] In this embodiment, the positioning protrusions 16 are arranged in a circle with the center of the lead screw hole 14 as the center, and are positioned corresponding to the four apex corners 421 of the end face of the gearbox 10.

[0051] In this embodiment, the gearbox 10 has an upwardly convex shape corresponding to the position of the worm gear 30, and the shock-absorbing rubber sleeve 50 has a thickened area 53 on the side of the gearbox 10 where the worm gear 30 is located, and the thickened area 53 is at the same height as the upwardly convex position.

[0052] In the above structure, improving the buffering capacity at this location can also help improve the sound insulation and noise reduction effect.

[0053] In this embodiment, Figure 1 The medium-length bar structure is a lead screw, and the thread on its upper part is a simplified drawing, so it is not shown.

[0054] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model. These improvements and modifications assumed above should also be considered within the protection scope of the present utility model.

Claims

1. A horizontal drive for an automotive seat, comprising a reduction gearbox, wherein the reduction gearbox is formed by a left housing and a right housing fastened together and a worm gear and a worm are provided within the cavity, the worm gear having a lead screw thread at its center, and lead screw holes coaxially arranged with the lead screw thread on both sides of the reduction gearbox, characterized in that: The gearbox housing is closed at the worm gear position, giving the entire gearbox a closed structure. The worm gear includes a cylindrical wheel body that meshes with the worm gear. The two ends of the wheel body form a rotating end face and a shaft head. The middle section of the wheel body is provided with worm gear teeth that mesh with the worm gear, and the ends of the worm gear teeth are spaced apart from the end face of the wheel body. It also includes a wear-resistant ring, which includes a radial support ring supported between the outer cylindrical wall of the shaft head and the inner wall of the lead screw hole, and an axial support member supported between the end face of the wheel body and the inner wall of the gearbox cavity. The axial support member corresponds to the shape of the cavity end faces at both ends of the gearbox and has a non-rotating shape. The outer edge of the axial support member is adapted to restrict the circumferential freedom of the wear-resistant ring.

2. The automotive seat leveling actuator according to claim 1, characterized in that: The lead screw hole passes through the interlocking surfaces of the left and right housings; the left housing has a riveting post on the side facing the right housing; the right housing has a riveting hole for the riveting post to pass through, and after the left and right housings are interlocked, the end of the riveting post is riveted to the right housing by upsetting.

3. The automotive seat leveling actuator according to claim 2, characterized in that: Both the left and right boxes are made of metal.

4. The automotive seat leveling actuator according to claim 1, characterized in that: The worm gear has support shafts at both ends, and one of the support shafts has a transmission hole that protrudes from the gearbox on its end face. The end face at the junction of the worm gear and the support shaft is provided with an annular oil reservoir ring.

5. The automotive seat leveling actuator according to claim 4, characterized in that: The inner and outer ring walls of the oil storage ring are provided with support ribs arranged at intervals along their axial direction, and the top surface of the support ribs is lower than the opening of the oil storage ring.

6. The automotive seat leveling actuator according to claim 1, characterized in that: The axial support has four apex corners in the projection direction of the lead screw hole axis, and anti-rotation grooves for accommodating the apex corners are provided at both ends of the left and right housings.

7. The automotive seat leveling actuator according to claim 2, characterized in that: There are four riveting posts, located at the four corners of the left box facing the right box.

8. The automotive seat leveling actuator according to claim 1, characterized in that: The gearbox has positioning protrusions at both ends facing the lead screw hole in the axial direction; the end faces and sides of the gearbox are fitted with shock-absorbing rubber sleeves, and the shock-absorbing rubber sleeves have positioning recesses for accommodating the positioning protrusions; the shock-absorbing rubber sleeves have through holes coaxial with the lead screw hole.

9. A car seat leveling actuator according to claim 8, characterized in that: The positioning protrusions are arranged in a circle with the center of the lead screw hole as the center, and are positioned at the four apex positions of the gearbox end face.

10. A car seat leveling actuator according to claim 8 or 9, characterized in that: The gearbox housing is convex at the worm gear position, and the shock-absorbing rubber sleeve has a thickened area on the side of the gearbox where the worm gear is located, with the thickened area being at the same height as the convex position.

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