Longitudinal adjustment mechanism for a vehicle seat, and motor bracket for the longitudinal adjustment mechanism

Abstract

This utility model provides a longitudinal adjustment mechanism for a vehicle seat and a motor bracket. The longitudinal adjustment mechanism includes drive units on both sides, each drive unit including a slide rail, a motor, and a motor bracket. The slide rails on both sides extend along the front-rear direction of the vehicle and are arranged parallel to each other on the vehicle floor. The vehicle seat is supported from below by a support component, allowing it to slide longitudinally. Gearboxes that drive the support component are respectively provided at the front end of the slide rails on both sides. In each drive unit, the motor is connected to the gearbox via a flexible shaft and is mounted on the side of the slide rail from the inside via a motor bracket. The motor outputs power to the gearbox via the flexible shaft, and the gearbox drives the support component, thereby allowing the vehicle seat to slide longitudinally. This invention can solve the problem of the overall arrangement of the motor bracket in complex vehicle floor and seat environments, and can also solve problems such as reduced rigidity, abnormal noise, and unstable operation caused by excessive bracket length in wide seat environments.

Description

Technical Field

[0001] This utility model relates to a longitudinal adjustment mechanism for a vehicle seat and a motor bracket for the longitudinal adjustment mechanism. Background Technology

[0002] The current mainstream vehicle seat longitudinal adjustment mechanism typically employs a slide rail drive mechanism, a combination of dual slide rails, a single motor, and a single bracket. This typically includes: a pair of left and right slide rails extending along the vehicle's longitudinal direction, parallel to each other and positioned opposite each other on the vehicle floor, supporting the left and right ends of the seat from below, allowing it to slide longitudinally; a motor bracket that traverses the space beneath the seat and connects to the pair of slide rails; and a single motor mounted on the motor bracket, with flexible shafts extending to the left and right sides, connected to gearboxes on the pair of slide rails via these shafts. The single motor drives the pair of slide rails through the flexible shafts, thereby causing the vehicle seat to slide longitudinally. The advantage of this longitudinal adjustment mechanism is that by using a single motor to synchronously drive the forward and backward movement of both left and right rails, a balanced distribution of rotational speed can be achieved, ensuring the synchronous precision of the left and right rail operation.

[0003] However, as the passenger vehicle market continues to demand higher levels of seat functionality and comfort, seat designs are becoming increasingly complex, such as integrating comfort functions like ventilation, heating, and massage. Simultaneously, to reduce the impact of vibration on passenger comfort, the design of the vehicle floor structure is also becoming more complex, employing structures such as bends and protrusions. These design trends have all led to a reduction in the effective space under the seats, increasing the difficulty of designing and arranging slide rail drive mechanisms with combinations such as the dual-rail-single-motor-single-support configurations described above.

[0004] Furthermore, modern passenger car seat designs exhibit diverse characteristics, especially in the rear seat sector, where spacious rear seats (so-called "big bench seats" or "wide-open seats") and 40 / 60 split-seat configurations are increasingly common. To accommodate these seat designs, traditional sliding rail drive mechanisms require a significant increase in their lateral dimensions (width), which can easily lead to a larger span of the support and a decrease in structural rigidity. When the drive source is an electric motor, the flexible shaft extends from the motor to both sides, with the free end located on the gearbox side. According to the Euler-Bernoulli beam theory, the amplitude at the free end is A=F / k, where F is the harmonic force acting on the shaft, and k is the shaft stiffness, which depends on the shaft length L, the moment of inertia I, the elastic modulus EE, etc. For a cantilever beam fixed at one end and free at the other, the stiffness k can be approximately expressed as k=48EI / L. 3 Therefore, the relationship between amplitude A and axis length L can be expressed as: A = FL 3 / 48EI. Therefore, the longer the flexible shaft, the greater the amplitude of the free end, and consequently the greater the probability of inducing abnormal noises and reduced stability during operation.

[0005] In response to the problems of current mainstream technologies, as shown in patent documents 1 and 2, a dual-rail dual-electric drive slide rail device is proposed. A motor is set on a pair of left and right slide rails respectively. The motors on both sides exist independently and drive the slide rails synchronously, so that the vehicle seat moves longitudinally.

[0006] Existing technical documents Patent documents Patent Document 1: Chinese Invention No. CN112208400B Patent Document 2: Chinese Utility Model No. CN218750423U However, while technologies like those in Patent Documents 1 and 2 eliminate the traditional motor bracket running under the seat and integrate the motor onto the slide rail, effectively freeing up space under the seat, this results in a greater height for the slide rail drive mechanism, making its vertical design and arrangement still quite challenging. Furthermore, it complicates the structure of the slide rail drive mechanism, making assembly, maintenance, and replacement difficult and costly. Utility Model Content

[0007] The purpose of this invention is to provide a longitudinal adjustment mechanism for a vehicle seat that can solve the above-mentioned problems in the prior art, and a motor bracket for the longitudinal adjustment mechanism.

[0008] The first aspect of this utility model provides a longitudinal adjustment mechanism for a vehicle seat, wherein the longitudinal adjustment mechanism includes drive units located on both lateral sides of the vehicle seat. Each drive unit on both sides includes a slide rail, a motor, and a motor bracket. The slide rails on both sides extend along the longitudinal direction of the vehicle and are arranged parallel to each other on the vehicle floor. The vehicle seat is supported from below by a support member so that it can slide longitudinally. Gearboxes for driving the support members are respectively provided at the front end of the slide rails on both sides. In each drive unit, the motor is connected to the gearbox via a flexible shaft and is mounted on the side of the slide rail from the inside via the motor bracket. The motor outputs power to the gearbox through the flexible shaft, thereby the gearbox drives the support member, and thus the support member causes the vehicle seat to slide longitudinally.

[0009] In the longitudinal adjustment mechanism of the vehicle seat described above, the gearbox may have a power input hole with a lateral opening, and the motor bracket may have a through hole that is coaxial with the power input hole of the gearbox in the installed state. In the installed state, one end of the flexible shaft is inserted into the interior of the motor, and the other end of the flexible shaft extends out of the motor, passes through the through hole of the motor bracket, and is inserted into the power input hole of the gearbox.

[0010] In the longitudinal adjustment mechanism of the vehicle seat described above, the motor bracket may also be made of plastic.

[0011] In the longitudinal adjustment mechanism of the vehicle seat described above, the motor bracket may have multiple reinforcing ribs formed inside around the through hole, thereby forming a honeycomb rib structure.

[0012] In the longitudinal adjustment mechanism of the vehicle seat described above, the mounting surface of the motor bracket opposite to the motor may have two bracket-side mounting holes and four protrusions with shapes similar to the mounting base of the motor. The two bracket-side mounting holes are arranged in a point-symmetric manner with respect to the axis of the through hole, and their positions correspond to the motor-side mounting holes formed on the motor. Two protrusions are provided on both sides of each bracket-side mounting hole. The two protrusions are arranged in a line-symmetric manner with respect to the axis connecting the axis of the through hole and the axis of the bracket-side mounting hole. The motor is pre-positioned relative to the motor bracket by engaging with the mounting base through the protrusions, and then is formally fixed to the motor bracket by passing screws through the motor-side mounting holes and screwing them into the bracket-side mounting holes.

[0013] In the longitudinal adjustment mechanism of the vehicle seat described above, rivets protruding upwards can be integrally formed on the slide rail at intervals along the length of the slide rail and parallel to the gearbox. The motor bracket has a first groove for engaging the gearbox and a second groove for engaging the rivets on the side connected to the slide rail. The motor bracket is pushed from the inside toward the slide rail, causing the gearbox to be embedded in the first groove and the rivets to be embedded in the second groove, thereby engaging the motor bracket with the slide rail. The portion of the motor bracket that connects the first groove and the second groove protrudes from the slide rail inwards and covers the slide rail and the gearbox from the side.

[0014] In the longitudinal adjustment mechanism of the vehicle seat described above, a portion of the cross-section of the gearbox may be dovetail-shaped when viewed from the side, the first groove may be a dovetail groove whose shape corresponds to the cross-sectional shape of the gearbox, the rivet may be an irregularly shaped rivet, and the second groove may be an irregularly shaped groove whose shape corresponds to the shape of the rivet.

[0015] In the longitudinal adjustment mechanism of the vehicle seat described above, the rivet may have a rod portion protruding upward from the slide rail and a cap portion formed at the top of the rod portion, and a crushing rib is formed along the height direction in the portion of the second groove that engages with the cap portion of the rivet.

[0016] The second aspect of this utility model provides a motor bracket for the longitudinal adjustment mechanism of the vehicle seat described in any of the above embodiments.

[0017] Utility Model Effect (1) The longitudinal adjustment mechanism of the vehicle seat includes drive units located on both sides of the vehicle seat. Each drive unit on both sides includes a slide rail, a motor and a motor bracket. The slide rails on both sides extend along the front-rear direction of the vehicle and are arranged parallel to each other on the floor of the vehicle. The vehicle seat is supported from below by a support member so that it can slide longitudinally. A gearbox for driving the support member is provided at the front end of the slide rails on both sides. In each drive unit, the motor is connected to the gearbox through a flexible shaft and is mounted on the side of the slide rail from the inside through the motor bracket. The motor outputs power to the gearbox through the flexible shaft, so that the gearbox drives the support member, thereby allowing the vehicle seat to slide longitudinally.

[0018] Therefore, the dual-rail, dual-motor design and compact motor bracket overcome the traditional motor bracket's requirement for a large installation space, demonstrating greater adaptability in the space arrangement under the seat. Moreover, because the motor is connected to the slide rail through the compact motor bracket, the distance between the motor and the slide rail is significantly shortened, effectively reducing the cantilever length of the motor bracket and the flexible shaft (flexible drive shaft), thereby optimizing the abnormal noise and vibration numbness during slide rail operation.

[0019] Furthermore, traditional motor brackets are generally over 400mm in length. In contrast, the motor bracket of this invention is smaller in size. The length can be designed to be 110-60mm depending on the transmission efficiency of the motor and the flexible shaft; the width can be designed to be 90-40mm depending on the size of the gearbox and the rivets (described later) and the distance between them; and the height can be designed to be 80-30mm depending on the height of the motor used. The smaller overall profile is more advantageous for the final assembly of the vehicle body frame. Simultaneously, the smaller size of the motor bracket corresponds to a shorter flexible shaft, resulting in less vibration during motor operation, thus reducing noise and rattling.

[0020] (2) The gearbox has a power input hole with a transverse opening, and the motor bracket has a through hole that is coaxial with the power input hole of the gearbox in the installed state. In the installed state, one end of the flexible shaft is inserted into the interior of the motor, and the other end of the flexible shaft extends out from the motor, passes through the through hole of the motor bracket, and is inserted into the power input hole of the gearbox.

[0021] Therefore, because the motor and the slide rail gearbox are connected by a compact motor bracket, the distance between the motor and the slide rail gearbox is greatly shortened, effectively reducing the cantilever length of the flexible transmission shaft and the motor bracket, thereby optimizing the abnormal noise and vibration numbness phenomena during the operation of the slide rail.

[0022] (3) The motor bracket is made of plastic. Therefore, the motor bracket is easy to manufacture, has low cost, and is lightweight.

[0023] (4) The motor bracket has multiple reinforcing ribs formed inside around the through hole, thus forming a honeycomb rib structure. As a result, the motor bracket is easy to manufacture, has low cost, light weight, and high strength.

[0024] (5) The motor is pre-positioned relative to the motor bracket by engaging with the mounting base via the boss, and then formally fixed to the motor bracket by passing a screw through the mounting hole on the motor side and screwing it into the mounting hole on the bracket side. Thus, based on the boss, screw, and mounting hole, high-precision assembly with high concentricity can be achieved through simple operations.

[0025] (6) Push the motor bracket from the inside toward the slide rail so that the gearbox is embedded in the first groove and the rivet is embedded in the second groove, thereby engaging the motor bracket with the slide rail. The part of the motor bracket that connects the first groove and the second groove protrudes from the slide rail to the inside and covers the slide rail and the gearbox from the side.

[0026] Therefore, it is fixed by two parallel slots. The first slot is used to firmly fix the motor bracket and gearbox, and the second slot is used to assist in fixing the motor bracket and slide rail and to prevent the motor bracket from rotating. The motor bracket protects the slide rail from the side. When the seat is impacted from the outside, the motor bracket can withstand the impact force and torque, protecting the slide rail and motor shaft from damage and reducing maintenance costs.

[0027] (7) When viewed from the side, a portion of the cross-section of the gearbox is dovetail-shaped, the first groove is a dovetail groove whose shape corresponds to the cross-sectional shape of the gearbox, the rivet is an irregularly shaped rivet, and the second groove is an irregularly shaped groove whose shape corresponds to the shape of the rivet. This further enhances the fixing strength between the motor bracket and the slide rail bracket.

[0028] (8) A crushing rib is formed along the height direction at the portion in the second groove that engages with the cap of the rivet. Thus, the crushing rib can absorb assembly tolerances in the vertical direction and prevent the motor bracket from wobbling.

[0029] (9) The motor bracket of this utility model can be used in the longitudinal adjustment mechanism of the vehicle seat described in any of the above.

[0030] Therefore, the motor bracket can be applied to the following scenarios: (a) complex seats and body functions are highly integrated, and the space under the seat is limited; (b) seats with a large lateral length, such as large benches or wide-legged seats; (c) other adjustment mechanisms that need to be driven by motors in a limited space.

[0031] According to this utility model, a longitudinal adjustment mechanism for vehicle seats and a motor bracket can be obtained. The structure is simple and compact, the external dimensions are small, and multiple functions that are helpful for manufacturing and assembly are integrated. The cost is low, and it is easy to assemble, repair, and replace. It can solve the problem of the overall arrangement of motor brackets in complex vehicle chassis and seat environments. It can also solve the problems of reduced rigidity, abnormal noise, and unstable operation caused by excessively long brackets in wide seat environments.

[0032] Other structures, functions, and effects of this utility model will become clear from the following description of the embodiments. Attached Figure Description

[0033] Figure 1 This is a schematic exploded perspective view of the main structure of the longitudinal adjustment mechanism of this utility model.

[0034] Figure 2 This is a schematic diagram of the longitudinal adjustment mechanism of this utility model in its installed state.

[0035] Figure 3 This is the front view of the motor bracket of this utility model.

[0036] Figure 4 This is a top view of the motor bracket of this utility model.

[0037] Figure 5 This is a side view of the motor bracket of this utility model, and it is a view observed from the motor side.

[0038] Figure 6 This is a perspective view of the motor bracket of this utility model.

[0039] Figure 7 This is a side view of the boss on the motor bracket of this utility model, and it is a view observed from the motor side.

[0040] Figure 8 This is a schematic diagram of the first slot and the gearbox.

[0041] Figure 9 This is a schematic diagram of the second groove and the rivet.

[0042] Figure 10 This is a schematic diagram of the crushing reinforcement.

[0043] Figure 11This is a diagram illustrating the installation steps of the longitudinal adjustment mechanism of this utility model.

[0044] Explanation of reference numerals in the attached figures 1. Slide rail 2 Motor bracket 21 Through holes 22 Mounting holes on the side of the bracket 3. Flexible shaft 4 motors 41 Mounting base 42 Motor-side mounting holes 5 screws 6 bosses 7 Gearbox 71 Power Input Port 72. Top of the gearbox 8 Rivets 9 First slot 10 Second slot 11. Crushing reinforcement Detailed Implementation

[0045] The following is for reference Figures 1 to 11 The present invention provides a detailed description of the longitudinal adjustment mechanism for a vehicle seat and the motor bracket for the longitudinal adjustment mechanism.

[0046] Figure 1 This is a schematic exploded perspective view (parts exploded view) of the main structure of the longitudinal adjustment mechanism of this utility model. Figure 2 This is a schematic diagram of the longitudinal adjustment mechanism of this utility model in its installed state. Figure 3 This is a front view of the motor bracket of this utility model. The left side of the figure is the motor side, and the right side of the figure is the slide rail side. Figure 4 This is a top view of the motor bracket of this utility model. The left side of the figure is the motor side, and the right side of the figure is the slide rail side. Figure 5 This is a side view of the motor bracket of this utility model, and it is a view observed from the motor side. Figure 6 This is a perspective view of the motor bracket of this utility model. Figure 7 This is a side view of the boss on the motor bracket of this utility model, and it is a view observed from the motor side. Figure 8 This is a schematic diagram of the first slot and gearbox. The left side shows the assembled state, and the right side shows the disassembled state. Figure 9 This is a schematic diagram of the second slot and the rivet. The left side shows the assembled state, and the right side shows the disassembled state. Figure 10 This is a schematic diagram of the crushing reinforcement. Figure 11This is an illustration of the installation steps of the longitudinal adjustment mechanism of this utility model. (a) shows the assembly state in which the first assembly is formed, (b) shows the assembly state in which the second assembly is formed, (c) shows a perspective view of the state after the first assembly and the second assembly are connected, (d) shows a cross-sectional view of the connection relationship between the flexible shaft and the motor, motor bracket and slide rail, (e) shows a side view of the pre-positioning state of the first assembly and the second assembly, and (f) shows a perspective view of the state after the first assembly and the second assembly are formally fixed.

[0047] In this invention, the longitudinal adjustment mechanism is a mechanism for adjusting the longitudinal position of the vehicle seat (in other words, the position in the front-rear direction of the vehicle body), but it is not limited to this and can also be an adjustment mechanism for any seat that needs to adjust the longitudinal position.

[0048] In the following description, although the vehicle body, vehicle floor, vehicle seats, support components that allow longitudinal sliding of the seats, components connecting the gearbox to the support components, and components of the synchronous drive motor are omitted from the description and illustrations, these components can be any suitable components and mechanisms in the prior art. For example, the support component that allows longitudinal sliding of the seats can be a track, bracket, chain, linkage, etc.

[0049] The longitudinal adjustment mechanism of the vehicle seat in this embodiment includes drive units located on both sides (both sides in the vehicle width direction) of the vehicle seat. Only one drive unit is shown in the figure. The structure of the other drive unit is mirror-symmetrical with respect to the longitudinal center axis of the vehicle operation. Therefore, the detailed description of the other drive unit is omitted.

[0050] like Figure 1 , Figure 2 , Figure 11 As shown in (d), the drive unit includes a slide rail 1, a motor 4, and a motor bracket 2. The slide rail 1 extends along the front-rear direction of the vehicle and is parallel to and opposite to the slide rail on the other side (not shown) on the vehicle floor (not shown). It supports the vehicle seat (not shown) from below via a support member (not shown), allowing it to slide longitudinally. Gearboxes 7 for driving the support members are respectively provided at the front ends of the slide rails on both sides. The motor 4 is connected to the gearboxes 7 via a flexible shaft 3 and is driven from the inside via the motor bracket 2 (…). Figure 1 In the slide rail, the side where the motor is installed is the front side, therefore in Figure 1 The inner side is the right side, and for the other side of the slide rail, the inner side is the left side. It is installed on the side of slide rail 1. Motor 4 outputs power to gearbox 7 via flexible shaft 3, thereby gearbox 7 drives support components, which in turn allow the vehicle seat to slide longitudinally.

[0051] like Figure 11As shown in (d), the gearbox 7 has a power input hole 71 that opens laterally. The power input hole 71 can be a square hole, but it can be of any shape and construction as long as it can accept power input from the motor. The motor bracket 2 has a through hole 21, which is a round hole, coaxial with the power input hole 71 of the gearbox 7 in the installed state. In the installed state, one end of the flexible shaft 3 is inserted into the interior of the motor 4, and the other end of the flexible shaft 3 extends out from the motor 4, passes through the through hole 21 of the motor bracket 2, and is inserted into the power input hole 71 of the gearbox 7.

[0052] Furthermore, although it is described here that the gearbox 7 is a front-mounted type of slide rail with the front end of the slide rail 1, it can also be a rear-mounted type with the gearbox at the rear end of the slide rail, or a central type with the gearbox in the middle of the slide rail. The installation position and connection structure of the motor bracket can be adjusted accordingly to the position of the gearbox, and the motor bracket of this utility model can also be applied.

[0053] Furthermore, as described above, a slide rail is installed on the vehicle floor and supports the seat longitudinally via a support member. The slide rail can be installed above or below the floor, and the support member protrudes upward from the floor to support the seat.

[0054] In addition, such as Figure 5 As shown, the motor bracket 2 is a plastic part manufactured using a conventional injection molding process. Multiple reinforcing ribs 6 are formed inside around the through hole 21, thus forming a honeycomb-like structure. The material, manufacturing method, and internal structure of the motor bracket are not limited to this.

[0055] In addition, such as Figure 5 , Figure 7 As shown, on the mounting surface of the motor bracket 2 opposite to the motor 4 ( Figure 1 The right side of the motor 4 has two bracket-side mounting holes 22 and four protrusions 6 with shapes similar to the mounting base 41 of the motor 4. The two bracket-side mounting holes 22 are arranged symmetrically with respect to the axis of the through hole 21, and their positions correspond to the motor-side mounting holes 42 formed on the motor 4. Two protrusions 6 are provided on both sides of each bracket-side mounting hole 22. The two protrusions 6 are arranged symmetrically with respect to the axis connecting the axis of the through hole 21 and the axis of the bracket-side mounting hole 22. The motor 4 is pre-positioned relative to the motor bracket 2 by engaging with the mounting base 42 through the four protrusions 6. Then, by... Figure 1 The screw 5 shown passes through the motor-side mounting hole 41 and is screwed into the bracket-side mounting hole 22 to be formally fixed to the motor bracket 2.

[0056] In addition, such as Figure 2 , Figure 6 , Figure 8 , Figure 9As shown, on the slide rail 1, rivets 8 are integrally formed at intervals along the length of the slide rail 1 and parallel to the gearbox 7, protruding upwards. The motor bracket 2 is located on the side connected to the slide rail 1. Figure 1 The left side of the slide rail 1 has a first groove 9 for engaging the gearbox 7 and a second groove 10 for engaging the rivet 8. During assembly, the motor bracket 2 is pushed from the inside (right side of the figure) towards the slide rail 1, causing the gearbox 7 to engage in the first groove 9 and simultaneously causing the rivet 8 to engage in the second groove 10, thereby engaging the motor bracket 2 with the slide rail 1. Figure 11 As shown in (d), the portion of the motor bracket 2 that connects the first slot 9 and the second slot 10 protrudes inward from the slide rail 1 and covers the slide rail 1 and gearbox 7 from the side.

[0057] In addition, such as Figure 8 As shown, in a side view, a portion of the cross-section of the gearbox 7, such as the top 72 of the gearbox 7, is dovetail-shaped. The first groove 9 is a dovetail groove whose shape corresponds to the cross-sectional shape of the gearbox 7. This design allows the gearbox 7 to be securely fitted into the first groove 9. Figure 9 As shown, rivet 8 is an irregularly shaped rivet, and the second groove 10 is an irregularly shaped groove corresponding to the shape of rivet 8. This design allows rivet 8 to be securely fitted into the second groove 10. Furthermore, the two parallel grooves 9 and 10 of the motor bracket 2 simultaneously engage with the two components 7 and 8 on the slide rail 1, thereby preventing the rotation of the motor bracket 2 through the second groove 10 and absorbing external impacts to protect the gearbox 7.

[0058] In addition, such as Figure 9 As shown, the rivet 8 has a shank protruding upward from the slide rail 1 and a cap formed at the top of the shank. Figure 10 As shown, a crushing rib 11 is formed along the height direction in the portion of the second groove 10 that engages with the head of the rivet 8. This crushing rib is used to adjust the assembly tolerance in the vertical direction of the seat and prevent the motor bracket from wobbling.

[0059] Next, refer to Figure 11 The assembly steps of one side drive unit of the longitudinal adjustment mechanism described above are explained. The steps of the other side drive unit are the same, so the explanation is omitted.

[0060] Step (1): As Figure 11 As shown in (a), with the first groove 9 and the second groove 10 of the motor bracket 2 aligned with the gearbox 6 and the rivet 8 of the slide rail 1 respectively, the motor bracket 2 is pushed from the inside toward the slide rail 1, so that the gearbox 7 is embedded in the first groove 9 and the rivet 8 is embedded in the second groove 10. Thus, the motor bracket 2 and the slide rail 1 are engaged and connected to form the first assembly. Step (2): As Figure 11As shown in (b), one end of the flexible shaft 3 is inserted into the motor 4 until it is in place, so that the other end of the flexible shaft 3 protrudes from the motor 4, thereby forming the second assembly; Step (3): As Figure 11 As shown in (c), (d), and (e), the other end of the flexible shaft 3 is inserted into the power input hole 71 of the gearbox 7 by passing the other end through the through hole 21 of the motor bracket 2, and the mounting base 41 of the motor 4 is engaged with the boss 6 on the motor bracket 2 for pre-positioning, and the motor side mounting hole 41 of the motor 4 is aligned with the bracket side mounting hole 21 of the motor bracket 2, thereby combining the second assembly with the first assembly. Step (4): As Figure 11 As shown in (f), the screw 5 for fixing the motor passes through the motor-side mounting hole 41 from the inside and is screwed into the bracket-side mounting hole 21. Then the screw 5 is tightened to complete the assembly of one side drive unit.

[0061] By repeating the steps (1) to (4) above, the same assembly can be performed on the other side of the drive unit.

[0062] After the drive units on both sides are assembled, the drive units are installed on the floor of the vehicle, and the seats are supported from below by the support components, thus completing the assembly of the longitudinal adjustment mechanism.

[0063] Next, the technical effects that can be obtained from the longitudinal adjustment mechanism of the vehicle seat according to the present invention and the motor bracket for the longitudinal adjustment mechanism will be explained.

[0064] (1) The longitudinal adjustment mechanism of the vehicle seat includes drive units located on both sides of the vehicle seat. Each drive unit includes a slide rail 1, a motor 4 and a motor bracket 2. The slide rails 1 on both sides extend along the front-rear direction of the vehicle and are arranged parallel to each other on the floor of the vehicle. The vehicle seat is supported from below by a support member so that it can slide longitudinally. A gearbox 7 for driving the support member is provided at the front end of the slide rails 1 on both sides. In each drive unit, the motor 4 is connected to the gearbox 7 through a flexible shaft 3 and is installed on the side of the slide rail 1 from the inside through the motor bracket 2. The motor 4 outputs power to the gearbox 7 through the flexible shaft 3, so that the gearbox 7 drives the support member, thereby allowing the vehicle seat to slide longitudinally.

[0065] As mentioned above, the dual-rail, dual-motor design and compact motor bracket overcome the traditional motor bracket's requirement for a large installation space, demonstrating greater adaptability in the space arrangement under the seat. Moreover, because the motor is connected to the slide rail through the compact motor bracket, the distance between the motor and the slide rail is significantly shortened, effectively reducing the cantilever length of the motor bracket and the flexible shaft (flexible drive shaft), thereby optimizing the abnormal noise and vibration numbness during slide rail operation.

[0066] Moreover, traditional motor brackets are generally over 400mm in length, compared to which... Figure 3 , Figure 4 As shown, the motor bracket of this utility model is small in size. Its length can be designed to be 110~60mm depending on the transmission efficiency of the motor and flexible shaft; its width can be designed to be 90~40mm depending on the size of the gearbox and rivets and the distance between them; and its height can be designed to be 80~30mm depending on the height of the motor used. The smaller overall profile is more advantageous for the final assembly of the vehicle body frame. At the same time, the smaller size of the motor bracket corresponds to a shorter flexible shaft, resulting in less vibration during motor operation, thus reducing abnormal noise and rattling.

[0067] (2) In the installed state, one end of the flexible shaft 3 is inserted into the inside of the motor 4, and the other end of the flexible shaft 3 extends out from the motor 4, passes through the through hole 21 of the motor bracket 2 and is inserted into the power input hole 71 of the gearbox 7.

[0068] As described above, the motor and the gearbox of the slide rail are connected by a compact motor bracket, which greatly reduces the distance between the motor and the gearbox of the slide rail, effectively reducing the cantilever length of the flexible transmission shaft and the motor bracket, thereby optimizing the abnormal noise and vibration numbness phenomenon during the operation of the slide rail.

[0069] (3) The motor bracket is made of plastic, which makes the motor bracket easy to manufacture, low in cost and light in weight.

[0070] (4) The motor bracket 2 has multiple reinforcing ribs formed inside around the through hole 21, thus forming a honeycomb rib structure. As a result, the motor bracket is easy to manufacture, has low cost, light weight and high strength.

[0071] (5) The motor 4 is pre-positioned relative to the motor bracket 2 by engaging with the mounting base 41 via the boss 6, and then is formally fixed to the motor bracket 2 by passing the screw 5 through the mounting hole 41 on the motor side and screwing it into the mounting hole 22 on the bracket side. Thus, based on the boss 6, the screw 5, and the mounting holes 22 and 41, high-precision assembly with high concentricity can be achieved through simple operation.

[0072] (6) Push the motor bracket 2 from the inside toward the slide rail 1, so that the gearbox 7 is embedded in the first groove 9, and at the same time, the rivet 8 is embedded in the second groove 10, thereby engaging the motor bracket 2 with the slide rail 1. The part of the motor bracket 2 that connects the first groove 9 and the second groove 10 ( Figure 3 , Figure 4 The left side portion of the slide rail 1 protrudes inward from the slide rail 1 and covers the slide rail 1 and gearbox 7 from the side.

[0073] As described above, the motor is fixed by two parallel slots. The first slot securely fixes the motor bracket to the gearbox, while the second slot assists in fixing the motor bracket to the slide rail and prevents the motor bracket from rotating. The motor bracket protects the slide rail from the side. When the seat is impacted from the outside, the motor bracket can withstand the impact force and torque, protecting the slide rail and motor shaft from damage and reducing maintenance costs.

[0074] (7) When viewed from the side, a portion 72 of the cross-section of the gearbox 7 is dovetail-shaped, the first groove 9 is a dovetail groove whose shape corresponds to the cross-sectional shape of the gearbox 7, the rivet 8 is an irregularly shaped rivet, and the second groove 10 is an irregularly shaped groove whose shape corresponds to the shape of the rivet 8. This can further improve the fixing strength between the motor bracket and the slide rail bracket.

[0075] (8) A crushing rib 11 is formed along the height direction in the part of the second groove 10 that is fitted with the head of the rivet 8. Thus, the crushing rib can absorb the assembly tolerance in the vertical direction and prevent the motor bracket from shaking.

[0076] (9) The motor bracket of this utility model can be used in the longitudinal adjustment mechanism of the vehicle seat described in any of the above. Thus, the motor bracket is applicable to the following scenarios: (a) complex seats and body functions are highly integrated, and the space under the seat is limited; (b) the seat is a large bench or a seat with a large lateral length, etc.; (c) other adjustment mechanisms that need to be driven by a motor in a limited space.

[0077] According to this utility model, a longitudinal adjustment mechanism for vehicle seats and a motor bracket can be obtained. The structure is simple and compact, the external dimensions are small, and multiple functions that are helpful for manufacturing and assembly are integrated. The cost is low, and it is easy to assemble, repair, and replace. It can solve the problem of the overall arrangement of motor brackets in complex vehicle chassis and seat environments. It can also solve the problems of reduced rigidity, abnormal noise, and unstable operation caused by excessively long brackets in wide seat environments.

[0078] More specifically, the motor bracket according to this utility model can achieve the following effects: (a) The traditional motor bracket that runs across the underside of the seat has been eliminated, freeing up space between the underside of the seat and the top of the vehicle floor, thus increasing the freedom of design and arrangement of the vehicle seats; (b) Unlike patent documents 1 and 2, the motor is not integrated on the slide rail, which would increase the height of the seat in the vertical direction. The manufacturing and maintenance costs of the integrated structure are high. The motor bracket of this utility model is only an improvement on the traditional motor bracket, which can improve the design and layout freedom of the vehicle seat and reduce the modification cost. (c) It can reduce the size of the motor bracket. Specifically, the length can be designed to be 110~60mm according to the transmission efficiency of the motor and the flexible shaft, the width can be designed to be 90~40mm according to the size of the gearbox and the rivet and the distance between them, and the height can be designed to be 80~30mm according to the height of the motor used. At the same time, it integrates a number of functions that help assembly and manufacturing, such as small size and high strength, anti-rotation, bearing external force, protecting the slide rail and gearbox, improving concentricity, and low cost, which greatly improves the operability of production assembly operations. (d) In the transmission system driven by the flexible shaft, the distance between the motor and the gearbox is shortened, the cantilever length of the motor bracket and the flexible shaft (flexible transmission shaft) is effectively reduced, thereby optimizing the abnormal noise and vibration numbness phenomenon during the operation of the slide rail. (e) The motor bracket can be positioned in the front, rear, or center according to the location of the gearbox, thereby increasing the freedom of design and arrangement of vehicle seats.

[0079] The embodiments of the longitudinal adjustment mechanism for the vehicle seat and the motor bracket of the present invention have been described in detail above. However, it should be noted that the above detailed description is not intended to limit the scope of protection of the present invention, but only to make the technical solution of the present invention easier to understand.

[0080] Furthermore, the embodiments described above are only some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

Claims

1. A longitudinal adjustment mechanism for a vehicle seat, characterized in that, The longitudinal adjustment mechanism includes drive units located on both lateral sides of the vehicle seat. Each drive unit on both sides includes a slide rail, a motor, and a motor bracket. The slide rails on both sides extend along the longitudinal direction of the vehicle and are arranged parallel to each other on the vehicle floor. The vehicle seat is supported from below by support members, allowing it to slide longitudinally. Gearboxes for driving the support members are respectively provided at the front end of the slide rails on both sides. In each of the aforementioned drive units The motor is connected to the gearbox via a flexible shaft and is mounted on the side of the slide rail from the inside via the motor bracket. The motor outputs power to the gearbox via the flexible shaft, thereby the gearbox drives the support component, and the support component causes the vehicle seat to slide longitudinally.

2. The longitudinal adjustment mechanism for a vehicle seat as described in claim 1, characterized in that, The gearbox has a power input port that opens laterally. The motor bracket has a through hole that is coaxial with the power input hole of the gearbox in the installed state. In the installed state, one end of the flexible shaft is inserted into the interior of the motor, and the other end of the flexible shaft extends out of the motor, passes through the through hole of the motor bracket, and is inserted into the power input hole of the gearbox.

3. The longitudinal adjustment mechanism for a vehicle seat as described in claim 1 or 2, characterized in that, The motor bracket is made of plastic.

4. The longitudinal adjustment mechanism for a vehicle seat as described in claim 2, characterized in that, The motor bracket has multiple reinforcing ribs formed inside around the through hole, thus forming a honeycomb rib structure.

5. The longitudinal adjustment mechanism for a vehicle seat as described in claim 2, characterized in that, The motor bracket has two bracket-side mounting holes and four bosses with shapes similar to the motor mounting base on its mounting surface opposite to the motor. The two bracket-side mounting holes are arranged symmetrically with respect to the axis of the through hole, and their positions correspond to the motor-side mounting holes formed on the motor. Two bosses are provided on both sides of each bracket-side mounting hole, and the two bosses are arranged linearly symmetrically with respect to the axis connecting the axis of the through hole and the axis of the bracket-side mounting hole. The motor is pre-positioned relative to the motor bracket by engaging with the mounting base via the boss, and then is formally fixed to the motor bracket by passing screws through the mounting holes on the motor side and screwing them into the mounting holes on the bracket side.

6. The longitudinal adjustment mechanism for a vehicle seat as described in claim 2, characterized in that, On the slide rail, rivets protruding upwards are integrally formed at intervals parallel to the gearbox along the length direction of the slide rail. The motor bracket has a first groove for engaging the gearbox and a second groove for engaging the rivets on the side connected to the slide rail. The motor bracket is pushed from the inside toward the slide rail, causing the gearbox to engage with the first groove and the rivet to engage with the second groove, thereby locking the motor bracket and the slide rail together. The portion of the motor bracket that connects the first slot and the second slot protrudes inward from the slide rail and covers the slide rail and the gearbox from the side.

7. The longitudinal adjustment mechanism for a vehicle seat as described in claim 6, characterized in that, When viewed from the side, a portion of the cross-section of the gearbox is dovetail-shaped, and the first groove is a dovetail groove whose shape corresponds to the cross-sectional shape of the gearbox. The rivet is an irregularly shaped rivet, and the second groove is an irregularly shaped groove whose shape corresponds to that of the rivet.

8. The longitudinal adjustment mechanism for a vehicle seat as described in claim 6, characterized in that, The rivet has a shank protruding upward from the slide rail and a cap formed at the top of the shank. The portion of the second groove that engages with the cap of the rivet has a crushing rib formed along its height.

9. An electric machine support, characterized in that A longitudinal adjustment mechanism for a vehicle seat according to any one of claims 1-8.

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