Automobile seat horizontal drive

Abstract

The utility model provides a horizontal driver of car seat, including the reduction gearbox that is formed through left, right box body buckle, be equipped with the cavity, worm wheel and worm in the reduction gearbox, worm screw thread is equipped with in the worm wheel center, the both sides of reduction gearbox are equipped with the worm hole of coaxial arrangement with worm screw thread, the worm wheel includes the wheel body of engagement with worm, be equipped with worm wheel tooth on the wheel body, both ends of wheel body are equipped with the shaft head, the shaft head and wheel body junctions are equipped with the gasket of with wheel body end face abut, still include wear -resisting ring, wear -resisting ring includes the radial support ring of support between the outer cylindrical wall of shaft head and worm hole inner wall, and the axial support spare of support between gasket and reduction gearbox cavity inner wall, the axial support spare and the cavity end face shape of both ends of reduction gearbox correspond and present non -rotating body modelling, the axial support spare and the outer edge of cavity end face fit 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 actuator. Existing horizontal actuators 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. In particular, due to production cost considerations, the worm gear teeth are cut through the gearbox. Under the premise of controlling the size of the gearbox, when the worm gear is subjected to axial load, the worm gear teeth are prone to scraping against the inner wall of the gearbox, which increases the friction during operation, accelerates the wear of the gearbox, and also easily accumulates heat, increases operating noise, and shortens the life of the gearbox.

[0003] To address the aforementioned issues, the applicant filed an application on November 19, 2019, disclosing a horizontal drive reduction gearbox for automotive seats. The gearbox includes a reduction gearbox containing a worm gear and a worm shaft. The worm gear has a lead screw thread at its center. Lead screw holes, coaxially aligned with the lead screw thread, are located on both sides of the reduction gearbox. The worm gear includes a wheel body adapted to the worm shaft. Each wheel body has a shaft end at both ends. A shim abutting against the end face of the wheel body is located at the junction of the shaft end and the wheel body. A wear-resistant ring, fitted onto the shaft end, is located on the side of the shim facing away from the wheel body end face. The wear-resistant ring includes a radial support ring supported between the outer cylindrical wall of the shaft end and the inner wall of the lead screw hole, and an axial support ring supported between the shim and the inner wall of the reduction gearbox. This invention, by using a shim to separate the wheel body from the wear-resistant ring, avoids scratching between the wheel body end face and the wear-resistant ring, preventing wear and effectively distributing stress, thus reducing wear and noise.

[0004] In recent years, user feedback has revealed that the gasket engages with the tooth groove via a locating ear, and the wear ring adapts to the mating surfaces of the left and right housings via a circumferential locating part. Load is then borne by the sliding friction between the gasket and the wear ring, with only one sliding surface. Over time and with changes in load direction, the locating ear is prone to disengagement from the tooth groove due to the reciprocating changes in the axial clearance of the worm gear. Subsequently, the locating ear is flattened by axial compression, leading to the failure of the circumferential constraint between the locating ear and the worm gear. The flattened locating ear then becomes susceptible to... This can easily lead to excessive flatness of the gasket, which exacerbates the wear on the wear ring and causes a sharp decrease in service life. At the same time, when the circumferential positioning part is under stress, the force on the wear ring in the circumferential direction is not symmetrical with that on the left and right housings, which can easily lead to deformation of the wear ring or failure of the circumferential positioning part. Furthermore, the left and right housings of the driver are fixed with bolts, which requires tapping in the manufacturing process and screwing the bolts in during assembly. The small size and spacing of adjacent bolts mean that they can only be tightened manually, which makes it difficult to improve 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 includes a reduction gearbox formed by a left and right housing. The reduction gearbox has a cavity housing a worm gear and a worm. The worm gear has a lead screw thread at its center. The reduction gearbox has lead screw holes coaxially arranged with the lead screw thread on both sides. The worm gear includes a wheel body that meshes with the worm. The wheel body has worm gear teeth. Both ends of the wheel body have shaft ends. At the junction of the shaft ends and the wheel body, there are washers that abut against and rotate relative to the end faces of the wheel body. The drive also includes a wear-resistant ring. The wear-resistant ring includes a radial support ring supported between the outer cylindrical wall of the shaft end and the inner wall of the lead screw hole, and an axial support member supported between the washers and the inner wall of the reduction gearbox cavity. The axial support member corresponds to the shape of the cavity end faces at both ends of the reduction 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 gearbox housing formed after the left housing and the right housing are fastened together is in a closed state at the position corresponding to the worm gear, so that the entire gearbox presents a closed structure.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] The present invention is further configured such that the gasket is made of stainless steel or spring steel, and the wear-resistant ring is made of polyoxymethylene (POM) or polybutylene terephthalate (PBT).

[0015] 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.

[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 beneficial effects of this utility model are:

[0018] 1. By setting shims to separate the wheel body from the wear ring, relative sliding can occur between the shims and the wheel body, while relative rotation can also occur between the shims and the wear ring, forming two sliding surfaces to reduce wear. This also avoids the drawbacks of existing shims with positioning ears. The wear 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, service life is longer, and noise is effectively reduced.

[0019] 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.

[0020] 3. With the optimization and improvement of the internal structure, there is no need to set up an additional oil filling port, which also avoids the loss of grease;

[0021] 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.

[0022] 5. With the optimization and improvement of the internal structure, there is no need to set up an additional oil filling port (refer to the existing patent in the background technology, the reduction gearbox at the worm gear position is open), which also avoids the loss of grease; an especially important point is that when the existing technology is used 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. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0024] Figure 2 This utility model Figure 1 A magnified structural diagram of part A.

[0025] Figure 3 This utility model Figure 2 A schematic diagram of the explosion structure.

[0026] Figure 4 This utility model Figure 3 A magnified structural diagram of part B.

[0027] 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-Worm gear tooth; 222-Shaft head; 30-Worm; 31-Support shaft; 32-Transmission hole; 33-Oil reservoir ring; 331-Support rib; 40-Shim; 50-Wear ring; 51-Radial support ring; 52-Axial support component; 521-Penetration angle; 60-Shock-absorbing rubber sleeve; 61-Positioning recess; 62-Through hole. Detailed Implementation

[0028] 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.

[0029] refer to Figures 1 to 4 ,like Figures 1 to 4The illustrated automotive seat horizontal actuator includes a reduction gearbox 10 formed by a left housing 11 and a right housing 12 fastened together. The reduction gearbox 10 has a cavity 13 housing a worm gear 20 and a worm 30. The worm gear 20 has a central lead screw thread 21. The reduction gearbox 10 has lead screw holes 14 on both sides, coaxially aligned with the lead screw thread 21. The worm gear 20 includes a wheel body 22 meshing with the worm 30. The wheel body 22 has worm gear teeth 221. Both ends of the wheel body 22 have shaft ends 222, which are connected to the wheel body 22. At the junction of the two parts, there are shims 40 that abut against and rotate relative to the end face of the wheel body 22; it also includes a wear-resistant ring 50, which includes a radial support ring 51 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 52 supported between the shim 40 and the inner wall of the cavity 13 of the gearbox 10. The axial support member 52 corresponds to the shape of the end face of the cavity 13 at both ends of the gearbox 10 and is a non-rotational body. The outer edge of the axial support member 52 is adapted to restrict the circumferential freedom of the wear-resistant ring 50.

[0030] In the above structure, the wheel body 22 and the wear ring 50 are separated by a shim 40, allowing relative sliding between the shim 40 and the wheel body 22, while also allowing relative rotation between the shim 40 and the wear ring 50, forming two sliding surfaces to reduce wear. This also avoids the drawbacks of existing shims 40 with positioning ears (refer to the prior art patent in the background section). The wear ring 50 is circumferentially positioned by the axial support 52 and the end faces of the cavities 13 at both ends of the gearbox 10. Under load, the stress is more dispersed, resulting in a longer service life and effectively reducing noise.

[0031] 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.

[0032] 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.

[0033] In this embodiment, both the left box 11 and the right box 12 are made of metal.

[0034] In this embodiment, the gearbox 10 formed by the left housing 11 and the right housing 12 being fastened together is in a closed state at the position corresponding to the worm gear 30, so that the entire gearbox 10 presents a closed structure.

[0035] In the above structure, with the optimization and improvement of the internal structure, there is no need to set an additional oil filling port (refer to the existing patent in the background technology, the reduction gearbox at the worm gear position is open), and the loss of grease is also avoided. An especially important point is that when the existing technology is used 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.

[0036] 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.

[0037] The above structure can increase the amount of grease stored at the end of the worm 30, thus achieving long-term lubrication.

[0038] 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.

[0039] 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.

[0040] In this embodiment, the axial support member 52 is provided with four apex corners 521 in the projection direction of the axis of the lead screw hole 14, and anti-rotation grooves 15 for accommodating the apex corners 521 are provided at both ends of the left housing 11 and the right housing 12.

[0041] In the above structure, the axial support 52 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.

[0042] In this embodiment, there are four riveting posts 111, located at the four corners of the left box 11 facing the right box 12.

[0043] In this embodiment, the gasket 40 is made of stainless steel or spring steel, and the wear ring 50 is made of polyoxymethylene (POM) or polybutylene terephthalate (PBT).

[0044] In the above structure, the gasket 40 is preferably made of stainless steel; the wear ring 50 is preferably made of polybutylene terephthalate (PBT).

[0045] 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 60, the shock-absorbing rubber sleeves 60 have positioning recesses 61 for accommodating the positioning protrusions 16; the shock-absorbing rubber sleeves 60 have through holes 62 that are coaxially opened with the lead screw hole 14.

[0046] The above structure can improve the fixing firmness between the shock-absorbing rubber sleeve 60 and the gearbox 10.

[0047] 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 at the four apex corners 521 of the end face of the gearbox 10.

[0048] 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.

[0049] 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 formed by a left housing and a right housing fastened together, wherein the reduction gearbox has a cavity that accommodates a worm gear and a worm, the worm gear has a lead screw thread at its center, and the reduction gearbox has lead screw holes on both sides coaxially arranged with the lead screw thread, characterized in that: The worm gear includes a wheel body that meshes with a worm, the wheel body having worm gear teeth, and shaft ends at both ends of the wheel body. A washer is provided at the junction of the shaft end and the wheel body, abutting against and rotating relative to 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 end and the inner wall of the lead screw hole, and an axial support member supported between the washer 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 2, characterized in that: The gearbox housing formed by the left and right housings being fastened together is closed at the position corresponding to the worm gear, making the entire gearbox a closed structure.

5. 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.

6. The automotive seat leveling actuator according to claim 5, 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.

7. 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.

8. A car 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.

9. A car 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.

10. A car seat leveling actuator according to claim 9, 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.

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