Seat leg rest adjustment device, seat, and vehicle

Abstract

A seat leg rest adjustment device, a seat and a vehicle. The seat leg rest adjustment device comprises an extension lead screw motor (40), a transmission nut (13), and a mounting bracket (12) and a leg rest bracket (11) which are in a sliding fit, wherein an extension lead screw (41) of the extension lead screw motor (40) is in transmission connection with the transmission nut (13); the sliding direction of the mounting bracket (12) relative to the leg rest bracket (11) is parallel to the extension direction of the extension lead screw (41); and the transmission nut (13) and the motor body are rotatably connected to the leg rest bracket (11) and the mounting bracket (12), respectively, with the projection of the rotation center line on the horizontal plane being perpendicular to the projection of the extension lead screw (41) on the horizontal plane. The rotational degrees of freedom at two assembly connection positions allow for adaptive rotation, which effectively prevents bending deformation of the extension lead screw due to applied forces. Moreover, the structure does not occupy additional space, which allows for reasonable control of the product weight and cost and effectively avoids operating noise generated by a high-power motor.

Description

A seat leg rest adjustment device, a seat and a vehicle

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411548321.5, filed on October 31, 2024, entitled "A Seat Leg Support Adjustment Device, Seat and Vehicle", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of automotive technology, specifically to a seat leg support adjustment device, a seat, and a vehicle. Background Technology

[0004] With the continuous development of intelligent cockpits in the automotive technology field, cars not only bring users convenience in terms of time, but also meet their ever-increasing demands for comfort. Among these, the diversification of seat functions is one of the important indicators of meeting user experience. Taking business vehicles as an example, most traditional business vehicle seats are equipped with leg rest functions. Users can adjust the unfolding angle and extension length of the leg rest through adjustment switches. Different users can make corresponding adjustments according to their own sitting posture, height and body type to obtain good comfort.

[0005] Adjusting the leg rest extension length typically requires a motor-driven lead screw mechanism. When the leg rest is extended, the motor lead screw operates as a cantilever beam. Due to the increasing interior space of vehicles, including but not limited to multi-purpose vehicles (MPVs), the extendable length of seat leg rests is also increasing. This lengthens the lever arm created by the extended leg rest, placing increasingly stringent stress on the lead screw motor. When heavier passengers use the leg rest, excessive stress on the motor lead screw can easily cause deformation, leading to shaking, abnormal noises, and jamming. In severe cases, the leg rest may become unable to retract.

[0006] A typical solution is to increase the diameter of the lead screw to enhance its resistance to deformation and increase the motor power to improve traction. However, this solution increases the space required for the leg rest, thus affecting the overall dimensions of the seat. Furthermore, larger motors and lead screws also increase product cost, weight, and operating noise.

[0007] In view of this, there is an urgent need to provide a solution for the existing leg support adjustment mechanism to overcome the above-mentioned defects. Summary of the Invention

[0008] To address the aforementioned technical problems, this invention provides a seat leg support adjustment device, a seat, and a vehicle. Through structural optimization of the seat leg support adjustment mechanism, while ensuring good leg support adjustment performance, space occupation, cost, and sound quality are reasonably controlled, providing a good technical guarantee for improving passenger comfort.

[0009] The first aspect of the present invention provides a seat leg support adjustment device, comprising an extension screw motor, a transmission nut, and a slidingly fitted mounting bracket and a leg support bracket. The extension screw motor includes a motor body and an extension screw that is throttledly connected to the motor body. The extension screw is throttledly connected to the transmission nut. The sliding direction of the mounting bracket relative to the leg support bracket is parallel to the extension direction of the extension screw. The transmission nut and the motor body are rotatably connected to the leg support bracket and the mounting bracket, respectively, and the projection of the rotation center line on the horizontal plane is perpendicular to the projection of the extension screw on the horizontal plane.

[0010] With this configuration, the transmission nut and motor body that are compatible with the extension screw have rotational freedom. Both assembly connection positions of the extension screw motor can rotate relative to the corresponding side bracket. When the front end of the leg support is subjected to a large bending moment, it can adapt to the rotation based on the rotational freedom of the two assembly connection positions, effectively preventing the extension screw from bending and deforming under stress.

[0011] In addition, compared to the method of overcoming the effect of lead screw deformation by increasing the diameter of the lead screw and increasing the power of the motor, the embodiment of this application will not occupy additional internal space of the leg support.

[0012] Furthermore, the two assembly connection positions of the extension screw motor provide rotational freedom, which not only avoids bending deformation of the extension screw, but also reasonably controls the product's weight and implementation cost, and effectively avoids the working noise generated by high-power motors.

[0013] Based on the first aspect, the present invention also provides a first embodiment of the first aspect: the extending lead screw is rotatably connected to the leg support bracket at a first connection point via a transmission nut, and the motor body is rotatably connected to the mounting bracket at a second connection point. In practical applications, the seat leg support adjustment device further includes a rear support bracket and a front support bracket, the transmission nut being rotatably connected to the rear support bracket relative to the leg support bracket, and the motor body being rotatably connected to the front support bracket relative to the mounting bracket. This reduces the manufacturing and assembly costs of implementing the corresponding functional structure.

[0014] For example, in the extension direction of the lead screw, the first connection point and the second connection point are located on two opposite sides. When the leg support is extended, the first connection point is located on the front side and the second connection point is located on the rear side. This arrangement can reduce the load acting on the front side when the leg support is extended, and reasonably control the adverse effects of the bending moment formed by the load on the operating performance of the leg support adjustment device.

[0015] In other practical applications, the motor body of the extension screw motor can also be rotatably connected to the leg support bracket side, and correspondingly, the transmission nut is rotatably connected to the mounting bracket side. In this way, the extension or retraction of the leg support can be achieved by driving the mounting bracket to slide relative to the leg support bracket through the transmission nut.

[0016] Based on the first embodiment of the first aspect, the present invention also provides a second embodiment of the first aspect: the rear support includes a first base plate and two first side walls, the two first side walls being fixedly disposed on two opposite side edges of the first base plate and extending toward the same side, and the first base plate of the rear support being fixedly connected to the leg support bracket, the transmission nut being built into the two first side walls of the rear support and rotatably connected to the corresponding side wall. The overall structure is more compact and reasonable, and facilitates assembly.

[0017] For example, the first base plate of the rear support can be connected to the leg support bracket by fastening screws, which provides better operability.

[0018] Other examples include the rear support being formed by a one-piece stamping process, by welding multiple plates together, or by machining.

[0019] Based on the second embodiment of the first aspect, the present invention also provides a third embodiment of the first aspect: the seat leg support adjustment device further includes two first stepped bolts, and each of the two opposite sides of the transmission nut has a first threaded hole. The two first stepped bolts pass through the first sidewall portion and are threadedly connected to the corresponding first threaded hole, and the first stepped bolts are pivotally connected to the corresponding first sidewall portion. In this way, a pivot can be formed at the first connection point, thereby establishing a rotational connection between the transmission nut and the leg support bracket.

[0020] In other practical applications, the first step bolt is pivotally connected to the first side wall of the rear support via the large diameter section, and a first bushing is nested between the two to achieve good actuation performance.

[0021] Based on the second or third embodiment of the first aspect, the present invention also provides a fourth embodiment of the first aspect: A gap is provided between the two opposing sides of the transmission nut and the two first sidewall portions of the rear support. Thus, when the leg support extension mechanism is subjected to a lateral force, or when the sliding load on both sides is uneven, the transmission nut side can adaptively move laterally relative to the rear support based on the gap between the transmission nut and the rear support, thereby releasing the lateral degree of freedom of the lead screw and preventing the extension lead screw from bending under force. This further ensures the reliability of the leg support extension action.

[0022] Based on the fourth embodiment of the first aspect, the present invention also provides a fifth embodiment of the first aspect: elastic elements are respectively provided between the two opposite sides of the transmission nut and the two first sidewall portions. With this arrangement, based on the support of the spring washers on both sides, the transmission nut can be centrally held between the two first sidewall portions of the rear support, avoiding lateral deviation that could affect the extension or retraction performance of the leg support. When subjected to a lateral force, the transmission nut can press against the spring washer located on one side, releasing the lateral degree of freedom of the lead screw using the gap, and providing a reset force after the lateral force is eliminated, enabling the transmission nut to quickly return to its central position.

[0023] For example, the elastic element is a pre-compressed spring washer. Under normal conditions, two spring washers can be pre-compressed and set between the transmission nut and the rear support, respectively. The spring washer can be in the form of a disc spring or a helical spring.

[0024] Based on the first embodiment of the first aspect, the present invention also provides a sixth embodiment of the first aspect: the front-end bracket as a whole includes a second base plate, two second side walls, and two end plates. The two second side walls are respectively fixedly disposed on two opposite side edges of the second base plate and extend toward the same side. The two end plates are respectively fixedly disposed at the extended ends of the two second side walls and extend toward opposite sides. The two end plates of the front-end bracket are fixedly connected to the mounting bracket. The motor body is housed between the two second side walls of the front-end bracket and is rotatably connected to the corresponding side second side walls. The overall structure is more compact and reasonable, and facilitates assembly operations.

[0025] Based on the sixth embodiment of the first aspect, the present invention also provides a seventh embodiment of the first aspect: the seat leg support adjustment device further includes a motor bracket, the motor body is fixed on the motor bracket, and is rotatably connected to the second side wall of the front bracket through the motor bracket. This improves the compatibility of the motor body configuration.

[0026] Based on the seventh embodiment of the first aspect, the present invention also provides an eighth embodiment of the first aspect: the seat leg rest adjustment device further includes two second-step bolts; the motor bracket includes a third base plate and two third sidewalls; the two third sidewalls are respectively fixedly disposed on two opposite side edges of the third base plate and extend toward the same side; the motor body is disposed between the two third sidewalls of the motor bracket and fixed to the third base plate; the third sidewalls are provided with second threaded holes; the two second-step bolts respectively pass through the two second sidewalls of the front end bracket and are threadedly connected to the corresponding second threaded holes, and the second-step bolts are pivotally connected to the corresponding second sidewalls. Thus, a pivot shaft forming a second connection point is created, thereby establishing a rotational connection of the motor body relative to the mounting bracket.

[0027] In other practical applications, the second step bolt is pivotally connected to the second side wall of the front support through the large diameter section, and a second bushing is nested between the two to obtain good actuation performance.

[0028] Based on the first aspect, or the first embodiment of the first aspect, or the second embodiment of the first aspect, or the third embodiment of the first aspect, or the fourth embodiment of the first aspect, or the fifth embodiment of the first aspect, or the sixth embodiment of the first aspect, or the seventh embodiment of the first aspect, or the eighth embodiment of the first aspect, the present invention also provides a ninth embodiment of the first aspect: the mounting bracket and the leg support bracket are slidably adapted to each other by a sliding assembly, the sliding assembly including a sliding groove and a sliding rail, the sliding rail being embedded in the groove of the sliding groove, and the two being able to slide relative to each other; one of the sliding groove and the sliding rail is fixed to the leg support bracket, and the other is fixed to the mounting bracket. It has the characteristics of simple structure and high reliability.

[0029] Based on the first aspect, or the first embodiment of the first aspect, or the second embodiment of the first aspect, or the third embodiment of the first aspect, or the fourth embodiment of the first aspect, or the fifth embodiment of the first aspect, or the sixth embodiment of the first aspect, or the seventh embodiment of the first aspect, or the eighth embodiment of the first aspect, the present invention also provides a tenth embodiment of the first aspect: the seat leg rest adjustment device further includes an unfolding screw motor and a linkage mechanism, the motor body of the unfolding screw motor is connected to the seat basin of the seat, the unfolding screw of the unfolding screw motor is connected and adapted to the input end of the linkage mechanism, and the output end of the linkage mechanism is connected and adapted to the leg rest bracket. Thus, it also has a reliable leg rest unfolding function.

[0030] A second aspect of the invention provides a seat comprising a seat basin and a leg rest, the leg rest being connected to the seat basin via a leg rest adjustment device, the leg rest adjustment device being as described above.

[0031] A third aspect of the invention provides a vehicle including the seat as described above. Based on this seat leg rest adjustment device, on the one hand, bending deformation of the extension screw due to force can be avoided, ensuring the performance of the leg rest extension or retraction; on the other hand, it can avoid additional space occupation, meeting the comfort requirements of the vehicle interior. Attached Figure Description

[0032] Figure 1 is a schematic diagram of a seat provided in an embodiment of this application;

[0033] Figure 2 is a schematic diagram of the leg rest of the seat shown in Figure 1 in the unfolded state;

[0034] Figure 3 is a schematic diagram of the usage state adjustment of a leg rest provided in an embodiment of this application;

[0035] Figure 4 is a cross-sectional view of the seat leg rest adjustment device provided in an embodiment of this application;

[0036] Figure 5 is an exploded view of the seat leg rest adjustment device provided in the embodiment of this application;

[0037] Figure 6 is a schematic diagram of a usage state of the seat leg support adjustment device provided in an embodiment of this application;

[0038] Figure 7 is another perspective view of the usage state shown in Figure 6;

[0039] Figure 8 is a schematic diagram of the assembly relationship of an extension screw motor provided in an embodiment of this application;

[0040] Figure 9 is a partial sectional view of EE in Figure 7;

[0041] Figure 10 is an enlarged schematic diagram of part G in 9;

[0042] Figure 11 is a partial cross-sectional view of FF in Figure 7;

[0043] Figure 12 is an enlarged schematic diagram of part I in 11.

[0044] In the diagram: Seat 100, Leg rest 10, Leg rest bracket 11, Mounting bracket 12, Transmission nut 13, First threaded hole 131, Leg rest body 14, Leg rest foam 141, Foam bracket 142, Sliding assembly 15, Slide groove 151, Slide rail 152, Rear end bracket 16, First base plate 16a, First side wall 16b, First fastening screw 161, First bushing 162, Front end bracket 17, Second base plate 17a, Second side wall 17b, End plate 17c, Second fastening screw 171, Second bushing 172, Motor bracket 18, Third base plate 18a, Third side wall 18b, Second threaded hole 181, First step bolt 191, Second step bolt 192, Spring washer 193, Seat basin 20, Linkage mechanism 30, Extending screw motor 40, Extending screw 41, Motor body 42, Deployment screw motor 50, Deployment screw 51. Specific Implementation

[0045] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0046] Please refer to Figures 1 and 2, where Figure 1 is a schematic diagram of a seat provided in an embodiment of this application, and Figure 2 is a schematic diagram of the seat shown in Figure 1 with the leg rests extended. For the sake of simplicity, the backrest of the seat is not shown in the figures.

[0047] The seat 100 provided in this embodiment has a leg support function, and its leg support 10 is connected to the seat basin 20. As shown in Figure 1, the leg support 10 is located on the front side of the seat basin 20 and is in a generally vertical retracted state to avoid affecting the occupant's sitting or movement across the seat. As shown in Figure 2, the occupant can control the extension and expansion of the leg support 10 through an adjustment switch (not shown in the figure) to support the occupant's legs and meet the requirements of seating comfort.

[0048] In actual use, passengers can make corresponding adjustments according to their own sitting posture, height, and body type by adjusting the unfolding angle and extension length of the leg rest 10. Please also refer to Figure 3, which is a schematic diagram of the adjustment of the leg rest in use according to an embodiment of this application. In order to illustrate the linkage mechanism 30 used for the unfolding action of the leg rest 10, only a partial skeleton structure of the seat basin 20 is shown in the figure.

[0049] When the leg support function is activated, the unfolding angle of the leg support 10 relative to the seat basin 20 can be adjusted as shown by arrow A in Figure 3, and the extension length of the leg support 10 relative to the leg support bracket 11 can be adjusted as shown by arrow B in Figure 3. In specific implementation, the adjustment of the unfolding angle of the leg support 10 is achieved by the linkage mechanism 30, which drives the leg support 10 (including the leg support bracket 11) to unfold or return to its original position under the drive of the unfolding drive component.

[0050] Here, the unfolding drive component can be implemented in different structural forms, such as, but not limited to, the unfolding lead screw motor 50. Please also refer to Figure 4, which is a cross-sectional view of the seat leg rest adjustment device provided in an embodiment of this application.

[0051] The unfolding lead screw 51 of the unfolding lead screw motor 50 is connected and adapted to the input end of the linkage mechanism 30. The rotation of the unfolding lead screw 51 drives the linkage mechanism 30 to move, and through the output end of the linkage mechanism 30, it drives the leg rest 10 to unfold or retract. Here, the linkage mechanism 30 can determine the linkage structure and the size of each linkage according to the overall design requirements of the seat to realize the unfolding or retraction of the leg rest 10. This embodiment of the application does not limit this.

[0052] The extension length of the leg rest 10 can also be adjusted using an extension screw motor 40. The extension screw 41 of the extension screw motor 40 is connected and adapted to the mounting bracket 12 of the leg rest 10. The mounting bracket 12 can slide relative to the leg rest bracket 11, thereby extending or retracting the leg rest 10. As shown in Figures 3 and 4, after the leg rest 10 is extended, the extension screw 41 is in a cantilever beam state. Due to the increasing interior space, the extendable length of the leg rest is also increasing, and the lever arm formed after the leg rest 10 is extended is correspondingly longer, making the stress state of the screw motor increasingly demanding.

[0053] When heavier occupants use the leg rest, excessive force on the motor lead screw can easily cause deformation of the extension lead screw, affecting its actuation performance. To overcome this problem, related technologies employ methods such as increasing the diameter of the extension lead screw and increasing motor power. This strengthens the lead screw's resistance to deformation and improves traction, thus mitigating deformation and its impact. In practical applications, both increasing the lead screw diameter and motor power increase the internal space required for the leg rest, potentially affecting the overall dimensions of the seat. Furthermore, it increases product development costs, weight, and operating noise.

[0054] Based on this, this application provides a seat leg rest adjustment device, which includes an extension screw motor, a transmission nut, and a slidingly fitted mounting bracket and a leg rest bracket. The extension screw motor includes a motor body and an extension screw drivenly connected to the motor body. The extension screw is drivenly connected to the transmission nut. The sliding direction of the mounting bracket relative to the leg rest bracket is parallel to the extension direction of the extension screw. The transmission nut and the motor body are rotatably connected to the leg rest bracket and the mounting bracket, respectively, and the projection of the rotation center line on the horizontal plane is perpendicular to the projection of the extension screw on the horizontal plane. With this configuration, the assembly of the transmission nut and the motor body adapted to the extension screw has rotational freedom. Both assembly connection positions of the extension screw motor can rotate relative to the bracket on the corresponding side. When the front end of the leg rest is subjected to a large bending moment, it can adapt to the rotation based on the rotational freedom of the two assembly connection positions, effectively preventing the extension screw from bending and deforming under stress.

[0055] Furthermore, compared to methods that overcome the effects of lead screw deformation by increasing the lead screw diameter and motor power, the embodiments of this application do not require additional internal space for the leg support. In addition, by providing rotational freedom based on the two assembly connection points of the extension lead screw motor, bending deformation of the extension lead screw can be avoided, while also reasonably controlling the product's weight and implementation cost, and effectively mitigating the operating noise generated by high-power motors.

[0056] To better understand the technical solutions and effects of this application, without loss of generality, the specific embodiments will be described in detail below with reference to the accompanying drawings. Please refer to Figures 5, 6, and 7, wherein Figure 5 is an exploded view of the assembly of the seat leg support adjustment device provided in the embodiment of this application, Figure 6 is a schematic diagram of one usage state of the seat leg support adjustment device provided in the embodiment of this application, and Figure 7 is another angle view of the usage state shown in Figure 6.

[0057] As shown in Figure 5, the leg rest 10 includes a leg rest body 14 fixed to the mounting bracket 12. The leg rest body 14 includes an integrated leg rest foam 141 and a foam support 142, which are assembled and fixed to the mounting bracket 12 via the foam support 142. In use, the leg rest foam 141 provides good comfort.

[0058] In other possible implementations, the leg support body 14 may also adopt other structural forms, such as, but not limited to, a leg support plate assembled and fixed with the mounting bracket 12, or other leg support bodies with a certain degree of elastic cushioning assembled and fixed with the mounting bracket 12. This application does not limit the specific implementation.

[0059] The seat leg rest adjustment device also includes a leg rest bracket 11 that is slidably adapted to the mounting bracket 12, as well as an extension screw motor 40 and a transmission nut 13. The extension screw 41 of the extension screw motor 40 is connected to the transmission nut 13. The mounting bracket 12 is slidably adapted to the leg rest bracket 11. As shown in Figures 6 and 7, the motor body 42 of the extension screw motor 40 is connected to the mounting bracket 12 side, and the transmission nut 13 is connected to the leg rest bracket 11 side. The sliding direction of the mounting bracket 12 relative to the leg rest bracket 11 is parallel to the extension direction of the extension screw 41. It should be understood that "parallel" here refers to approximately parallelism, including within the allowable range of geometric tolerances.

[0060] Thus, after the extension screw motor 40 starts, the rotational driving force is transmitted to the transmission nut 13 through the extension screw 41. Based on the screw-nut transmission principle, the relative rotation is converted into the linear motion of the screw. This motion can be achieved by the motor body 42 of the extension screw motor 40 driving the mounting bracket 12 to slide relative to the leg support bracket 11, thereby extending or retracting the leg support. As shown in Figure 7, the transmission nut 13 is adapted to the extended end of the extension screw 41, that is, the rear end position of the extension screw 41. It can be understood that the leg support shown in Figure 7 is at its maximum extended length.

[0061] In other possible implementations, the extension screw motor 40 and the transmission nut 13 can also be arranged in opposite directions between the mounting bracket 12 and the leg support bracket 11 (not shown in the figure). That is, the motor body of the extension screw motor 40 is rotatably connected to the leg support bracket 11, and the transmission nut 13 is rotatably connected to the mounting bracket 12. Based on the screw and nut transmission principle, the mounting bracket 12 can be driven to slide relative to the leg support bracket 11 through the transmission nut 13, thus achieving the extension or retraction of the leg support. The specific implementation can be selected according to the overall design of the seat and the available space, and this application embodiment does not limit it.

[0062] In this embodiment, the extension screw 41 is rotatably connected to the leg support bracket 11 at the first connection point C via the transmission nut 13, and the motor body 42 is rotatably connected to the mounting bracket 12 at the second connection point D. Relatively speaking, in the extension direction of the extension screw 41, the first connection point C and the second connection point D are located on opposite sides. When the leg support is extended, the first connection point C is located at the front, and the second connection point D is located at the rear. The projection of the rotation center line between the transmission nut 13 and the leg support bracket 11 onto the horizontal plane, and the projection of the rotation connection line between the motor body 42 and the mounting bracket 12 onto the horizontal plane, are both perpendicular to the projection of the extension screw 41 onto the horizontal plane.

[0063] Thus, in the longitudinal plane, both ends of the extending lead screw motor 40 have rotational freedom at their respective connection points. When the leg rest 10 bears a large load and the extended portion deforms downwards accordingly, the bending force can be adaptively released in the longitudinal plane based on the rotational freedom at both ends of the extending lead screw motor 40, preventing the motor lead screw from bending under stress, thereby ensuring the reliability of the leg rest extension action. Specifically, please refer to Figure 4, where the extending lead screw 41 can be adjusted in the longitudinal plane to the posture shown by mark 41′. Here, the directional term "longitudinal" is defined with the seat as the descriptive reference, that is, the direction extending forward and backward along the seat.

[0064] Referring to Figures 6 and 7, the mounting bracket 12 and the leg support bracket 11 are slidably fitted together via a sliding assembly 15. This sliding assembly 15 includes a groove 151 and a slide rail 152. The slide rail 152 can be fitted into the groove 151, and the two can slide relative to each other to form the sliding assembly 15. In a specific implementation, the groove 151 is fixed to the leg support bracket 11, and the slide rail 152 is fixed to the mounting bracket 12, thereby achieving the slidable fit between the mounting bracket 12 and the leg support bracket 11.

[0065] In other specific implementations, the slide groove 151 and the slide rail 152 can also be configured in reverse between the leg support bracket 11 and the mounting bracket 12 (not shown in the figure). In other words, the slide rail 152 is fixed on the leg support bracket 11, and the corresponding slide groove 151 is fixed on the mounting bracket 12, which can also achieve sliding adaptation between the mounting bracket 12 and the leg support bracket 11.

[0066] In other possible implementations, the sliding fit between the mounting bracket 12 and the leg support bracket 11 can also adopt different structural forms, as long as a reliable sliding fit relationship between the mounting bracket 12 and the leg support bracket 11 is satisfied. This application does not limit the specific implementation.

[0067] To achieve good manufacturability, in a specific implementation, the transmission nut 13 and the motor body 42 can be connected by connecting brackets to form corresponding rotational connections. Please refer to Figures 5, 7, and 8, where Figure 8 is a schematic diagram of the assembly relationship of an extension screw motor provided in an embodiment of this application.

[0068] In this embodiment, at the first connection point C, the transmission nut 13 is rotatably connected to the leg support bracket 11 via the rear end bracket 16; at the second connection point D, the motor body 42 is rotatably connected to the mounting bracket 12 via the front end bracket 17, thereby reducing the manufacturing and assembly costs of the corresponding functional structure. Here, relative to the extension direction of the lead screw of the extension screw motor 40, the rear end bracket 16 is a bracket located closer to the rear end, and the front end bracket 17 is a bracket located closer to the front end.

[0069] The rear support 16 can be assembled onto the leg support 11 using the first fastening screw 161. Please refer to Figures 8, 9 and 10 together, where Figure 9 is a partial sectional view of EE in Figure 7, and Figure 10 is an enlarged schematic diagram of part G in 9.

[0070] The rear support bracket 16 is generally U-shaped, comprising a first base plate 16a and two first sidewalls 16b. The two first sidewalls 16b are fixedly disposed on two opposite sides of the first base plate 16a and extend towards the same side. In a specific implementation, the rear support bracket 16 can be formed using a one-piece stamping process. In other implementations, it can be formed by welding multiple plates or by machining. Comparatively, the one-piece stamping process of the rear support bracket 16 offers better manufacturability and meets the design requirements of lightweight design trends.

[0071] As shown in Figure 9, the first fastening screw 161 passes through the first base plate portion 16a of the rear end bracket 16 and fixes it to the leg support bracket 11, forming a detachable fixed connection, which facilitates assembly, disassembly, and maintenance. The transmission nut 13 can be built into the space between the two first side wall portions 16b of the rear end bracket 16, and the two opposite sides of the transmission nut 13 are provided with first threaded holes 131. Two first stepped bolts 191 pass through the two first side wall portions 16b of the rear end bracket 16 respectively and are threadedly connected to the first threaded holes 131 on the corresponding side of the transmission nut 13. Each first stepped bolt 191 is pivotally connected to the first side wall portion 16b of the rear end bracket 16, forming the pivot of the first connection point C. Thus, a rotational connection between the transmission nut 13 and the leg support bracket 11 is constructed.

[0072] Specifically, the first stepped bolt 191 is pivotally connected to the first side wall portion 16b of the rear support 16 via its root large-diameter section. To improve the stability and reliability of the pivotal rotation, as shown in Figure 10, a first bushing 162 is nested between the root large-diameter section of the first stepped bolt 191 and the first side wall portion 16b of the rear support 16.

[0073] The front bracket 17 can also be assembled onto the mounting bracket 12 using the second fastening screw 171. Please refer to Figures 8, 11 and 12, where Figure 11 is a partial sectional view of FF in Figure 7, and Figure 12 is an enlarged schematic diagram of part I in 11.

[0074] The front-end bracket 17 is generally U-shaped. This U-shaped front-end bracket 17 includes a second base plate 17a, two second sidewalls 17b, and two end plates 17c. The two second sidewalls 17b are respectively fixedly disposed on two opposite sides of the second base plate 17a and extend towards the same side. The two end plates 17c are respectively fixedly disposed at the extended ends of the two second sidewalls 17b and extend towards opposite sides. In a specific implementation, the front-end bracket 17 can be formed using an integral stamping process. As shown in Figure 11, the second fastening screw 171 passes through the two outwardly turned end plates 17c of the front-end bracket 17 and fixes it to the mounting bracket 12, forming a detachable fixed connection.

[0075] To improve the configuration compatibility of the motor body 42, it can be fixed to the motor bracket 18. The motor bracket 18 is generally U-shaped, and includes a third base plate 18a and two third sidewalls 18b. The two third sidewalls 18b are respectively fixedly disposed on two opposite side edges of the third base plate 18a and extend towards the same side. The motor body 42 can be built into the two third sidewalls 18b of the motor bracket 18 and can be assembled onto the third base plate 18a of the motor bracket 18 by fastening screws. The motor body 42 and the motor bracket 18 can be housed between the two second sidewall portions 17b of the front end bracket 17. The two third sidewall portions 18b of the motor bracket 18 have second threaded holes 181. Two second stepped bolts 192 pass through the two second sidewall portions 17b of the front end bracket 17 and are threadedly connected to the second threaded holes 181 of the corresponding third sidewall portions 18b of the motor bracket 18. Each second stepped bolt 192 is pivotally connected to the second sidewall portion 17b of the front end bracket 17, forming a pivot at the second connection point D. This establishes a rotatable connection between the motor body 42 and the mounting bracket 12.

[0076] Similarly, both the front bracket 17 and the motor bracket 18 can be formed by one-piece stamping, which has good machinability and meets the design requirements of the trend of lightweighting.

[0077] Specifically, the second stepped bolt 192 is pivotally connected to the second side wall portion 17b of the front end bracket 17 via its root large diameter section. To improve the stability and reliability of the pivotal rotation, as shown in Figure 12, a second bushing 172 is nested between the root large diameter section of the second stepped bolt 192 and the second side wall portion 17b of the front end bracket 17.

[0078] It should be noted that the rotational connection between the transmission nut 13 and the leg support bracket 11, and the rotational connection between the motor body 42 and the mounting bracket 12, are not limited to the connecting brackets shown in the figure. The structural form of the corresponding connecting bracket can be determined according to the overall design requirements of the product, as long as the corresponding rotational freedom can be achieved and the bending force can be adaptively released in the longitudinal plane.

[0079] Furthermore, in other possible implementations, the transmission nut 13 can be directly rotatably connected to the leg support bracket 11, and the motor body 42 can also be directly rotatably connected to the mounting bracket 12. For example, but not limited to, the above functions can be achieved through structural adjustments of the leg support bracket 11 and the mounting bracket 12. This application does not limit the scope of the embodiments.

[0080] To avoid bending deformation of the extension screw 41 due to lateral forces or uneven sliding loads on both sides during the extension or retraction of the leg rest, a lateral movement degree of freedom can be provided at the first connection point C of the extension screw motor 40. Here, the directional term "lateral" is defined with the seat as the descriptive reference, that is, the direction extending left and right along the seat.

[0081] As shown in Figures 9 and 10, there are gaps H between the two opposite sides of the transmission nut 13 and the two first sidewall portions 16b of the rear support 16. Figure 10 shows the gap configuration between the left side of the transmission nut 13 in Figure 9 and the corresponding first sidewall portion 16b of the rear support 16. It should be understood that the gap configuration between the right side of the transmission nut 13 and the corresponding first sidewall portion 16b of the rear support 16 is symmetrical with the gap configuration shown in Figure 10. In this way, when the leg support extension mechanism is subjected to a lateral force or uneven sliding load on both sides, based on the gap H between the transmission nut 13 and the rear support 16, the transmission nut 13 can adaptively move laterally relative to the rear support 16. That is, by releasing the lateral degree of freedom of the lead screw, the extension lead screw 41 is prevented from bending under force. This further ensures the reliability of the leg support extension action.

[0082] The size of this gap can be configured according to the functional requirements of the seat. In a specific implementation, optionally, spring washers 193 can be provided between the two opposite sides of the transmission nut 13 and the two first sidewalls 16b of the rear support 16. Under normal conditions, the two spring washers 193 can be pre-compressed between the sides of the transmission nut 13 and the first sidewalls 16b of the rear support 16. Based on the support of the spring washers 193 on both sides, the transmission nut 13 is centered between the two first sidewalls 16b of the rear support 16, preventing lateral deviation from affecting the extension or retraction of the leg rest. When subjected to a lateral force, the transmission nut 13 can press against the spring washer 193 on one side, releasing the lateral freedom of the lead screw using the gap, and providing a reset force after the lateral force is eliminated, enabling the transmission nut 13 to quickly return to its centered position. It has good self-adaptive capabilities.

[0083] In a specific implementation, the spring washer 193 can be fitted onto the second-step bolts 192 on both sides. The spring washer 193, as an elastic element, can be in the form of a disc spring or a coil spring, depending on the specific requirements. This application does not limit the specific implementation.

[0084] In addition to the aforementioned implementation of the seat leg rest adjustment device, this application embodiment also provides a vehicle, which includes a seat 100, a seat basin 20, and a leg rest 10. The leg rest 10 and the seat basin 20 are connected by the seat leg rest adjustment device as described above. Based on this seat leg rest adjustment device, on the one hand, it can avoid bending deformation of the extension screw under force, ensuring the performance of the leg rest extension or retraction operation; on the other hand, it can avoid additional space occupation, meeting the comfort requirements of the vehicle interior space.

[0085] It should be understood that other functional components of the vehicle can be implemented using existing technology, so they will not be described in detail here.

[0086] Furthermore, the ordinal numbers "first" and "second," etc., used herein are only for describing the composition or structure of the same function in the technical solution. It is understood that the use of the aforementioned ordinal numbers does not constitute a limitation on the understanding of the technical solution for which protection is sought in this application.

[0087] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A seat leg support adjustment device, comprising an extension screw motor, a transmission nut, and a slidingly fitted mounting bracket and a leg support bracket, wherein the extension screw motor comprises a motor body and an extension screw pulsatingly connected to the motor body, the extension screw being pulsatingly connected to the transmission nut, and the sliding direction of the mounting bracket relative to the leg support bracket being parallel to the extension direction of the extension screw; the transmission nut and the motor body are respectively rotatably connected to the leg support bracket and the mounting bracket, and the projection of the rotation center line on the horizontal plane is perpendicular to the projection of the extension screw on the horizontal plane.

2. The seat leg rest adjustment device according to claim 1, wherein, The extension screw is rotatably connected to the leg support bracket at the first connection point via the transmission nut, and the motor body is rotatably connected to the mounting bracket at the second connection point.

3. The seat leg rest adjustment device according to claim 2, wherein, In the extension direction of the lead screw, the first connection point and the second connection point are located on two opposite sides. When the leg support is extended, the first connection point is located on the front side and the second connection point is located on the rear side.

4. The seat leg rest adjustment device according to claim 2 or 3, wherein, The seat leg support adjustment device also includes a rear support bracket and a front support bracket. The transmission nut is rotatably connected to the leg support bracket via the rear support bracket, and the motor body is rotatably connected to the mounting bracket via the front support bracket.

5. The seat leg rest adjustment device according to claim 4, wherein, The rear support includes a first base plate and two first side walls. The two first side walls are respectively fixedly disposed on two opposite sides of the first base plate and extend toward the same side. The first base plate of the rear support is fixedly connected to the leg support bracket. The transmission nut is built into the two first side walls of the rear support and is rotatably connected to the first side wall on the corresponding side.

6. The seat leg rest adjustment device according to claim 5, wherein, The seat leg support adjustment device also includes two first step bolts. The two opposite sides of the transmission nut are provided with first threaded holes. The two first step bolts pass through the first side wall and are threadedly connected to the corresponding first threaded holes. The first step bolts are pivotally connected to the corresponding first side wall. The first step bolts are pivotally connected to the first side wall through the large diameter section, and a first bushing is nested between the two.

7. The seat leg rest adjustment device according to claim 5 or 6, wherein, There are gaps between the two opposite sides of the transmission nut and the two first sidewall portions; elastic elements are respectively provided between the two opposite sides of the transmission nut and the two first sidewall portions.

8. The seat leg rest adjustment device according to claim 7, wherein, The elastic element is a pre-compressed spring washer.

9. The seat leg rest adjustment device according to any one of claims 4-8, wherein, The front-end bracket includes a second base plate, two second side walls, and two end plates. The two second side walls are fixedly disposed on two opposite sides of the second base plate and extend toward the same side. The two end plates are fixedly disposed at the extended ends of the two second side walls and extend toward opposite sides. The two end plates of the front-end bracket are fixedly connected to the mounting bracket. The motor body is housed between the two second side walls of the front-end bracket and is rotatably connected to the corresponding second side wall.

10. The seat leg rest adjustment device according to claim 9, wherein, The seat leg support adjustment device also includes a motor bracket, the motor body is fixed on the motor bracket, and is rotatably connected to the second side wall of the front bracket through the motor bracket.

11. The seat leg rest adjustment device according to claim 10, wherein, The seat leg rest adjustment device also includes two second step bolts. The motor bracket includes a third base plate and two third side walls. The two third side walls are respectively fixedly disposed on two opposite sides of the third base plate and extend toward the same side. The motor body is disposed between the two third side walls of the motor bracket and fixed to the third base plate. The third side wall has a second threaded hole. The two second step bolts pass through the second side wall of the front end bracket and are threadedly connected to the corresponding second threaded hole. The second step bolt is pivotally connected to the corresponding second side wall. The second step bolt is pivotally connected to the second side wall through its large diameter section, and a second bushing is nested between the two.

12. The seat leg rest adjustment device according to any one of claims 1 to 11, wherein, The mounting bracket and the leg support bracket are slidably adapted to each other via a sliding assembly, the sliding assembly including a groove and a rail, the rail being fitted into the groove of the groove and the two being able to slide relative to each other; one of the groove and the rail is fixed to the leg support bracket and the other is fixed to the mounting bracket.

13. The seat leg rest adjustment device according to any one of claims 1 to 12, wherein, The seat leg support adjustment device also includes an unfolding screw motor and a linkage mechanism. The motor body of the unfolding screw motor is connected to the seat basin of the seat, the unfolding screw of the unfolding screw motor is connected and adapted to the input end of the linkage mechanism, and the output end of the linkage mechanism is connected and adapted to the leg support bracket.

14. A seat comprising a seat basin and a leg rest, wherein the leg rest is connected to the seat basin via a seat leg rest adjustment device, wherein the seat leg rest adjustment device is the seat leg rest adjustment device according to any one of claims 1 to 13.

15. A vehicle comprising a seat, the seat being the seat of claim 14.

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