Leg rest driving mechanism and automobile seat

Abstract

The application relates to the technical field of automobile seats, and discloses a leg support driving mechanism and an automobile seat. The leg support driving mechanism is arranged on the automobile seat and can drive the leg support to extend outward or be retracted inward on the automobile seat. The leg support driving mechanism comprises a mounting frame, a motor arranged on the mounting frame, an output shaft of the motor, and a telescopic movement piece arranged on the output shaft and capable of telescopic movement along the output shaft; a load-bearing frame slidably arranged on the mounting frame; and a connecting rod assembly comprising a first connecting rod, a second connecting rod and a third connecting rod which are sequentially hinged, and the length of the second connecting rod is greater than that of the first connecting rod. The motor can drive the load-bearing frame to make telescopic movement relative to the mounting frame through the connecting rod assembly, and the movement stroke of the load-bearing frame is greater than that of the telescopic movement piece. The application has the advantages that the stroke of the leg support on the automobile seat is amplified through the connecting rod assembly, a high-speed motor does not need to be replaced, a lead screw does not need to be lengthened, low cost is achieved, and the structure is simple.

Description

Technical Field

[0001] This invention relates to the field of automotive seat technology, and more particularly to a leg support drive mechanism and an automotive seat. Background Technology

[0002] In recent years, more and more car models have been equipped with leg rests to improve passenger comfort. Leg rests on car seats support the passenger's lower legs, and by adjusting the support position forward and backward, they can accommodate passengers of different body types. Passengers can also adjust the leg rest to a position that feels most comfortable for their feet.

[0003] To meet people's demands for car seat comfort, users often request increased leg rest travel, such as in zero-gravity seats, which fully support the passenger's lower legs, providing a comfortable experience whether sitting or lying down. However, while increasing the leg rest travel, users also require that the leg rest extension time remain unchanged to avoid excessively long extension times that could negatively impact the customer experience. Currently, existing technology typically meets these requirements by replacing the motor with a high-speed one and extending the lead screw. Extending the lead screw travel increases the leg rest travel; replacing it with a high-speed motor ensures that the increased leg rest travel does not affect the extension time. However, high-speed motors are significantly more expensive than ordinary motors, and extending the lead screw introduces uncertainties in stability and reduces its rigidity. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by the present invention is to propose a leg support drive mechanism that does not require replacement of high-speed motor and extension of lead screw, and is low in cost and simple in structure.

[0005] The technical solution adopted by the present invention to solve its technical problem is to propose a leg support driving mechanism, which is disposed on a car seat and can drive the leg support to extend outward or retract inward on the car seat. The leg support driving mechanism includes:

[0006] Mounting bracket, wherein a motor is mounted on the mounting bracket, and a telescopic moving component is mounted on the output shaft of the motor, which can telescopically move along the output shaft;

[0007] A load-bearing frame is slidably mounted on the mounting frame, and the leg support can be configured on the load-bearing frame. When the load-bearing frame slides relative to the mounting frame, the leg support can be extended or retracted.

[0008] A linkage assembly includes a first link, a second link, and a third link. One end of the third link is hinged to the load-bearing frame, and the other end of the third link is hinged to one end of the second link. The end of the second link away from the third link is hinged to the mounting frame. One end of the first link is hinged to the telescopic moving member, and the other end of the first link is hinged to the middle of the second link. The length of the second link is greater than the length of the first link.

[0009] The motor can drive the load-bearing frame to telescopically move relative to the mounting frame through the linkage assembly, and the movement stroke of the load-bearing frame is greater than the movement stroke of the telescopic moving component.

[0010] Furthermore, the output shaft of the motor is provided with a thread, and the telescopic moving part is provided with a threaded hole. The output shaft of the motor is screwed into the threaded hole so that the output shaft of the motor and the telescopic moving part form a lead screw and nut structure.

[0011] Furthermore, the stroke of the load-bearing frame is more than twice the stroke of the telescopic moving part, and the sliding direction of the load-bearing frame is the same as the telescopic moving direction of the telescopic moving part.

[0012] Furthermore, the mounting frame is provided with a first sliding groove, and the load-bearing frame is provided with a sliding member, which is slidably inserted into the first sliding groove.

[0013] Furthermore, the mounting frame is provided with a limiting member, and the load-bearing frame is provided with a second sliding groove, with the limiting member passing through the second sliding groove.

[0014] Furthermore, the mounting frame is symmetrically provided with a first sliding groove on each side, and the load-bearing frame is provided with sliding members corresponding to the two first sliding grooves one by one, and the two sliding members are respectively inserted into the two first sliding grooves;

[0015] The load-bearing frame is symmetrically provided with two second sliding grooves, and the mounting frame is provided with limiting members corresponding to the two second sliding grooves one by one, and the two limiting members are inserted into the two second sliding grooves.

[0016] Furthermore, the load-bearing frame is plate-shaped, the second sliding groove is formed on the panel of the load-bearing frame, and the load-bearing frame extends a first lug to each side of the mounting frame, and the two sliding members are respectively disposed on the two first lugs.

[0017] The mounting bracket is provided with two second lugs, and the two limiting members are respectively disposed on the two second lugs.

[0018] Furthermore, the load-bearing frame is made of metal, and the load-bearing frame has a connecting block, which is made of plastic; the end of the third link away from the second link is hinged to the connecting block.

[0019] Furthermore, the distance between the hinge points at both ends of the first connecting rod is 63 mm, and the distance between the hinge points at both ends of the second connecting rod is 120 mm;

[0020] The telescopic movement stroke of the telescopic moving component is 35 mm, and the sliding stroke of the load-bearing frame is 140 mm.

[0021] The technical solution adopted by the present invention to solve its technical problem is to also propose an automobile seat, including the above-mentioned leg support drive mechanism.

[0022] Compared with the prior art, the present invention has at least the following beneficial effects:

[0023] In this invention, a linkage assembly is provided between the motor and the load-bearing frame. When the motor drives the telescopic moving component to extend and retract, it drives the load-bearing frame to extend and retract along the mounting frame via the linkage assembly. The leg support is mounted on the load-bearing frame, so the motor drives the leg support through the telescopic moving component and the linkage assembly, realizing the extension and retraction of the leg support. The linkage assembly consists of a first link, a second link, and a third link hinged sequentially, with the second link being longer than the first link, thus amplifying the stroke. For example, if the motor drives the telescopic moving component to move 35 mm, after transmission through the linkage assembly, the sliding stroke of the load-bearing frame can reach 140 mm, meaning the leg support can extend to 140 mm. This amplifies the leg support's stroke without requiring a high-speed motor or an extended screw, while maintaining the same extension and retraction time. The entire leg support drive mechanism has a simple structure and low cost. The stroke ratio between the telescopic moving component and the leg support can be adjusted by adjusting the lengths of the links in the linkage assembly, making it widely applicable. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the leg support drive mechanism of the present invention;

[0025] Figure 2 for Figure 1 A structural diagram from another perspective;

[0026] Figure 3 This is a plan view of the leg support drive mechanism;

[0027] Figure 4 This is an exploded view of the leg support drive mechanism;

[0028] Figure 5 for Figure 1 A schematic diagram of the structure after removing the mounting bracket.

[0029] In the picture:

[0030] 1. Mounting bracket; 10. First slide groove; 11. Limiting component; 12. Second lug;

[0031] 2. Motor; 20. Output shaft; 21. Telescopic drive component; 211. Screw hole;

[0032] 3. Load-bearing frame; 30. Connecting block; 31. Sliding component; 32. Second slide groove; 33. First lug;

[0033] 4. Linkage assembly; 41. First link; 42. Second link; 43. Third link. Detailed Implementation

[0034] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of the present invention. However, the present invention is not limited to these embodiments.

[0035] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0036] Furthermore, in this invention, descriptions involving terms such as "first," "second," and "a" are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0039] like Figure 1 and Figure 3 As shown, a leg rest drive mechanism is configured on a car seat and can drive the leg rest to extend outward or retract inward on the car seat. It can adapt to passengers of different body types and heights, and passengers can adjust the position of the leg rest according to their own foot feel, thereby improving passenger comfort.

[0040] The leg support drive mechanism in this embodiment mainly includes: a mounting frame 1, a motor 2, a load-bearing frame 3, and a linkage assembly 4. The linkage assembly 4 mainly includes a first link 41, a second link 42, and a third link 43 that are hinged in sequence. The telescopic movement of the telescopic moving part driven by the motor 2 is transmitted to the load-bearing frame 3 through the linkage assembly 4. The load-bearing frame 3 slides on the mounting frame 1 to adjust the leg support.

[0041] A motor 2 is mounted on the mounting bracket 1, and a telescopic moving part that can extend and retract along the output shaft 20 of the motor 2 is mounted on the output shaft 20. Specifically, the output shaft 20 of the motor 2 is threaded, and the telescopic moving part is threaded with a threaded hole 211. The output shaft 20 of the motor 2 is screwed into the threaded hole 211, so that the output shaft 20 of the motor 2 and the telescopic moving part form a screw-nut structure. During operation, the motor 2 drives the output shaft 20 to rotate, and the thread on the output shaft 20 drives the telescopic moving part to extend and retract along the output shaft 20. Compared with other telescopic movement mechanisms, the screw-nut structure used in this embodiment provides smooth movement and ensures a higher level of passenger comfort.

[0042] The load-bearing frame 3 is slidably mounted on the mounting frame 1, and the leg rest can be configured on the load-bearing frame 3. When the load-bearing frame 3 slides relative to the mounting frame 1, it can cause the leg rest to extend or retract. In actual use, the leg rest can be fixedly connected to the load-bearing frame 3. Since the leg rest supports the passenger's lower legs during use and does not bear a large weight, the load-bearing frame 3 does not need to have a high support strength.

[0043] Specifically, the mounting frame 1 is provided with a first sliding groove 10, and the load-bearing frame 3 is provided with a sliding member 31. The sliding member 31 is slidably inserted into the first sliding groove 10. The sliding member 31 and the first sliding groove 10 cooperate to restrict the sliding direction of the load-bearing frame 3 and ensure reliable extension and retraction of the leg support. Furthermore, the mounting frame 1 is provided with a limiting member 11, and the load-bearing frame 3 is provided with a second sliding groove 32. The limiting member 11 is inserted into the second sliding groove 32. The mounting frame 1 is symmetrically provided with a first sliding groove 10 on each side, and the load-bearing frame 3 is provided with a sliding member 31 corresponding to the two first sliding grooves 10 one by one. The two sliding members 31 are respectively inserted into the two first sliding grooves 10. The load-bearing frame 3 is symmetrically provided with two second sliding grooves 32, and the mounting frame 1 is provided with limiting members 11 corresponding to the two second sliding grooves 32. The two limiting members 11 are inserted into the two second sliding grooves 32. Both the limiting members 11 and the sliding members 31 are symmetrically arranged and paired to ensure that the load-bearing frame 3 is balanced during sliding and to avoid deviation and jamming.

[0044] The load-bearing frame 3 is plate-shaped, and the second sliding groove 32 is opened on the panel of the load-bearing frame 3. The load-bearing frame 3 extends a first lug 33 to both sides of the mounting frame 1, and two sliding members 31 are respectively set on the two first lugs 33. The mounting frame 1 is provided with two second lugs 12, and two limiting members 11 are respectively set on the two second lugs 12.

[0045] In this embodiment, to ensure reliable sliding of the load-bearing frame 3 on the mounting frame 1, two sliding members 31 on both sides of the load-bearing frame 3 are adapted to the first sliding grooves 10 on both sides of the mounting frame 1; and two limiting members 11 on the mounting frame 1 are adapted to the two second sliding grooves 32 on the panel of the load-bearing frame 3. That is, the load-bearing frame 3 slides in multiple directions through both sides and the panel side, ensuring reliable movement and preventing the load-bearing frame 3 from detaching from the mounting frame 1, thus ensuring reliable extension and retraction of the leg supports.

[0046] like Figure 1 and Figures 4-5 As shown, the linkage assembly 4 includes a first link 41, a second link 42, and a third link 43. One end of the third link 43 is hinged to the load-bearing frame 3, and the other end of the third link 43 is hinged to one end of the second link 42. The end of the second link 42 away from the third link 43 is hinged to the mounting frame 1. One end of the first link 41 is hinged to the telescopic moving part, and the other end of the first link 41 is hinged to the middle of the second link 42. The length of the second link 42 is greater than the length of the first link 41. In actual use, the motor 2 can drive the load-bearing frame 3 to telescopically move relative to the mounting frame 1 through the linkage assembly 4. The stroke of the load-bearing frame 3 is greater than the stroke of the telescopic moving part. That is, the stroke is amplified through the linkage mechanism so that the stroke of the load-bearing frame 3 (i.e., the stroke of the leg support) meets the user requirements.

[0047] Specifically, in this embodiment, the stroke of the load-bearing frame 3 is more than twice the stroke of the telescopic moving part, and the sliding direction of the load-bearing frame 3 is the same as the telescopic moving direction of the telescopic moving part. The proportion of the stroke amplified by the linkage mechanism can be adjusted according to actual needs by adjusting the length ratio of each link in the linkage assembly 4. The load-bearing frame 3 is made of metal and has a connecting block 30 made of plastic. The end of the third link 43 furthest from the second link 42 is hinged to the connecting block 30, facilitating the connection between the plastic and metal parts.

[0048] As an optimal ratio for the links in the linkage assembly 4: in this embodiment, the distance between the hinge points at both ends of the first link 41 is 63 mm, and the distance between the hinge points at both ends of the second link 42 is 120 mm. With this length configuration, the telescopic motion stroke of the telescopic moving part is 35 mm, and the sliding stroke of the support frame 3 (i.e., the stroke of the leg rest) is 140 mm. The stroke of the leg rest is increased without needing to replace the motor 2 or extend the lead screw, while the unfolding and retracting times remain unchanged.

[0049] In practical use, this embodiment uses a linkage assembly 4 between the motor 2 and the support frame 3. When the motor 2 drives the telescopic moving part to extend and retract, the linkage assembly 4 drives the support frame 3 to extend and retract along the mounting frame 1. The leg support is mounted on the support frame 3, so the motor 2 drives the leg support through the telescopic moving part and the linkage assembly 4, thus extending and retracting the leg support. The linkage assembly 4 consists of a first link 41, a second link 42, and a third link 43, which are hinged in sequence. The length of the second link 42 is greater than the length of the first link 41, thus amplifying the stroke. This amplifies the leg support's stroke without requiring replacement of the high-speed motor 2 or extension of the lead screw, while maintaining the same extension and retraction time. The entire leg support drive mechanism is simple in structure and low in cost. The stroke ratio between the telescopic moving part and the leg support can be adjusted by adjusting the length of each link in the linkage assembly 4, making it widely applicable.

[0050] Furthermore, the linkage assembly 4 of this embodiment can be applied to the development of new car seats, as well as to the improvement of old car seats, so as to amplify the travel of the leg rest on the original car seat.

[0051] In this solution, the travel of the leg rest on the car seat is amplified through the linkage assembly 4, without the need to replace the high-speed motor 2 or extend the lead screw, thus achieving low cost and simple structure.

Claims

1. A leg rest drive mechanism, disposed on a car seat, and capable of driving the leg rest to extend outward or retract inward on the car seat, characterized in that... The leg support drive mechanism includes: Mounting bracket, wherein a motor is mounted on the mounting bracket, and a telescopic moving component is mounted on the output shaft of the motor, which can telescopically move along the output shaft; A load-bearing frame is slidably mounted on the mounting frame, and the leg support can be configured on the load-bearing frame. When the load-bearing frame slides relative to the mounting frame, the leg support can be extended or retracted. A linkage assembly includes a first link, a second link, and a third link. One end of the third link is hinged to the load-bearing frame, and the other end of the third link is hinged to one end of the second link. The end of the second link away from the third link is hinged to the mounting frame. One end of the first link is hinged to the telescopic moving member, and the other end of the first link is hinged to the middle of the second link. The length of the second link is greater than the length of the first link. The motor can drive the load-bearing frame to telescopically move relative to the mounting frame through the linkage assembly, and the movement stroke of the load-bearing frame is greater than the movement stroke of the telescopic moving component.

2. The leg support drive mechanism according to claim 1, characterized in that, The output shaft of the motor is provided with a thread, and the telescopic moving part is provided with a threaded hole. The output shaft of the motor is screwed into the threaded hole so that the output shaft of the motor and the telescopic moving part form a lead screw and nut structure.

3. The leg support drive mechanism according to claim 1, characterized in that, The stroke of the load-bearing frame is more than twice the stroke of the telescopic moving part, and the sliding direction of the load-bearing frame is the same as the telescopic moving direction of the telescopic moving part.

4. The leg support drive mechanism according to claim 1, characterized in that, The mounting frame is provided with a first sliding groove, and the load-bearing frame is provided with a sliding member, which is slidably inserted into the first sliding groove.

5. The leg support drive mechanism according to claim 4, characterized in that, The mounting frame is provided with a limiting member, and the load-bearing frame is provided with a second sliding groove, with the limiting member passing through the second sliding groove.

6. The leg support drive mechanism according to claim 5, characterized in that, The mounting frame is symmetrically provided with a first sliding groove on each side, and the load-bearing frame is provided with sliding members that correspond one-to-one with the two first sliding grooves. The two sliding members are respectively inserted into the two first sliding grooves. The load-bearing frame is symmetrically provided with two second sliding grooves, and the mounting frame is provided with limiting members corresponding to the two second sliding grooves one by one, and the two limiting members are inserted into the two second sliding grooves.

7. The leg support drive mechanism according to claim 6, characterized in that, The load-bearing frame is plate-shaped, and the second sliding groove is formed on the panel of the load-bearing frame. The load-bearing frame extends a first lug to each side of the mounting frame, and the two sliding members are respectively disposed on the two first lugs. The mounting bracket is provided with two second lugs, and the two limiting members are respectively disposed on the two second lugs.

8. The leg support drive mechanism according to claim 1, characterized in that, The load-bearing frame is made of metal and has a connecting block made of plastic; the end of the third link away from the second link is hinged to the connecting block.

9. The leg support drive mechanism according to claim 1, characterized in that, The distance between the hinge points at both ends of the first connecting rod is 63 mm, and the distance between the hinge points at both ends of the second connecting rod is 120 mm; The telescopic movement stroke of the telescopic moving component is 35 mm, and the sliding stroke of the load-bearing frame is 140 mm.

10. A car seat, characterized in that, Includes the leg support drive mechanism as described in any one of claims 1-9.

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