Pedal structure

Abstract

The utility model relates to a pedal structure which comprises a pedal assembly and a multi-tooth transmission mechanism, wherein the pedal assembly is connected to a backrest framework assembly in a turnover mode through a pedal rotating shaft, and the multi-tooth transmission mechanism is used for driving the pedal assembly to turn over through a motor. The multi-tooth transmission mechanism comprises a driving tooth coaxially fixed to the output shaft of the motor, a driven tooth coaxially fixed to the pedal rotating shaft and at least one middle tooth meshed between the driving tooth and the driven tooth. According to the pedal structure, multi-tooth type transmission is adopted, the strength of the pedal structure can be guaranteed, more installation position requirements of the pedal structure can be met, arrangement is flexible, and installation is convenient.

Description

Technical Field

[0001] This utility model relates to the field of automotive seat technology, and in particular to a foot pedal structure. Background Technology

[0002] Modern car seats typically include footrests on the backrests of the front seats for rear passengers. (See also...) Figure 1 and Figure 2 As shown, the existing pedal structure includes a pedal assembly 2 mounted on the backrest frame assembly 1 and capable of flipping relative to the backrest frame assembly 1; a motor 3 mounted on the backrest frame assembly 1 and used to drive the pedal assembly 2 to flip; and a transmission mechanism connecting the pedal assembly 2 and the motor 3. The existing transmission mechanism generally uses direct-drive gear transmission, including a driving gear 41 coaxially fixedly connected to the output shaft 31 of the motor 3, and a direct-drive driven gear 42' coaxially fixedly connected to the pedal shaft 21 of the pedal assembly 2. The driving gear 41 and the direct-drive driven gear 42' are meshed together. Using this direct-drive gear transmission method, the available space for the mounting position of the pedal shaft 21 (i.e., the pedal mounting position) is relatively small. Figure 2 As shown, in order not to affect the meshing state of the driving gear 41 and the direct drive driven gear 42', the installation position of the pedal pivot 21 (i.e. the center O2' of the direct drive driven gear 42') must fall on an arc with the center O1 of the driving gear 41 as the center and the distance from O1 to O2' as the radius (i.e., the arc-shaped dotted line shown).

[0003] As people's demands for ride comfort increase, some cars are designed with rear seats that can recline flat to improve the comfort of rear passengers. However, when rear passengers recline, their feet are raised, and correspondingly, the footrests installed in the front seats also need to be raised. Furthermore, in this raised state, the distance between the footrests and the rear seats in the fore-aft direction cannot be too far, otherwise the passengers' feet will not be able to reach the footrests; nor can they be too close, otherwise they will occupy too much space in the thickness direction of the seat. The optimal footrest installation position often falls outside the curved dotted line. To meet the footrest installation position requirements outside the curved dotted line, the size of the direct-drive gear transmission mechanism needs to be increased. However, the installation space on the seat back is limited, especially in the thickness direction, and the limited installation space may not be suitable for installing a larger direct-drive gear transmission mechanism. Although some transmission mechanisms use crank-type four-bar linkage, this transmission method involves the linkage between the links, which has poor stability and is only suitable for situations where the pedal strength requirement is not very high. For pedal structures that need to be raised, the strength requirement is higher, so crank-type four-bar linkage is not suitable. Utility Model Content

[0004] To address the aforementioned issues, this utility model provides a pedal structure that employs a multi-tooth transmission, ensuring both the strength of the pedal structure and adaptability to various installation positions, while also allowing for flexible arrangement.

[0005] This utility model is achieved through the following solution: a foot pedal structure, including a foot pedal assembly that is rotatably connected to the backrest frame assembly via a foot pedal pivot, and a multi-tooth transmission mechanism that drives the foot pedal assembly to rotate via a motor; the multi-tooth transmission mechanism includes an active tooth coaxially fixed to the output shaft of the motor, a passive tooth coaxially fixed to the foot pedal pivot, and at least one intermediate tooth meshing between the active tooth and the passive tooth.

[0006] This utility model adopts a multi-tooth transmission, which can not only ensure the strength of the pedal structure, but also adapt to more installation position requirements of the pedal structure. Moreover, the arrangement of the multiple teeth is flexible and easy to install, which can improve the space utilization of the base platform and save space occupied in the thickness direction of the seat back.

[0007] A further improvement of this invention is that the outer peripheries of the active tooth and the passive tooth are spaced apart from each other, and the projections of the active tooth and the passive tooth in the thickness direction of the backrest frame assembly partially overlap.

[0008] A further improvement of this utility model is that it also includes a mounting bracket for rotatably connecting the two ends of the foot pedal shaft to the backrest side plate of the backrest frame assembly, wherein the motor and the multi-tooth transmission mechanism are arranged on the same side of the mounting bracket.

[0009] A further improvement of this utility model is that the mounting bracket includes an inner bracket and an outer bracket fixedly connected to the inner bracket, and an accommodating space is formed between the inner bracket and the outer bracket for accommodating the multi-tooth transmission mechanism.

[0010] A further improvement of this utility model is that the motor is fixedly connected to the opposite outer side of the outer bracket, and the output shaft of the motor passes through the outer bracket and the accommodating space.

[0011] A further improvement of this utility model is that the corresponding end of the pedal pivot passes through the inner bracket and the accommodating space and is rotatably connected to the outer bracket.

[0012] A further improvement of this utility model is that the pedal pivot extends out of the outer bracket, and a pedal pivot mounting pin for blocking to the outside of the outer bracket is connected to the extended part.

[0013] A further improvement of this utility model is that the intermediate tooth is rotatably connected between the inner support and the outer support via an intermediate tooth pivot.

[0014] A further improvement of this utility model is that the intermediate tooth shaft extends out of the inner bracket, and an intermediate tooth mounting pin for blocking to the inner side of the inner bracket is connected to the extended part.

[0015] A further improvement of this utility model is that the pedal assembly includes two pedal connecting rods respectively fixed to the two ends of the pedal pivot and located on the opposite inner side of the mounting frame. Both ends of the pedal pivot are fitted with torsion springs, one end of which is connected to the mounting frame and the other end is connected to the pedal connecting rod or the pedal pivot. Attached Figure Description

[0016] Figure 1 A schematic diagram of the direct-drive gear transmission mechanism in an existing pedal structure is shown.

[0017] Figure 2 A schematic diagram of the tooth arrangement of the direct-drive gear transmission mechanism in an existing pedal structure is shown.

[0018] Figure 3 A comparative schematic diagram of the multi-tooth transmission mechanism driving the pedal assembly of this utility model is shown when it is deployed and retracted.

[0019] Figure 4 A schematic diagram comparing the tooth arrangement of the multi-tooth transmission mechanism of this utility model with that of the existing direct-drive tooth transmission mechanism is shown.

[0020] Figure 5 A schematic diagram of the overall structure of the pedal structure of this utility model is shown.

[0021] Figure 6 An assembly diagram of the foot pedal structure of this utility model is shown.

[0022] Figure 7 The diagram shows the assembly state of the pedal assembly with the intermediate gear and the driven gear in this utility model.

[0023] Figure 8 The diagram shows the assembly of the pedal assembly with the intermediate gear and the driven gear in this utility model.

[0024] Figure 9 The diagram shows the assembly of the foot pedal structure and the seat back frame of this utility model.

[0025] Figure 10 A schematic diagram showing the combined state of the foot pedal structure and the seat back frame of this utility model is provided.

[0026] In the diagram: 1. Backrest frame assembly; 11. Backrest side panel; 2. Foot pedal assembly; 21. Foot pedal pivot; 22. Foot pedal linkage; 23. Foot pedal pivot mounting pin; 3. Motor; 31. Output shaft; 32. Motor mounting nut; 41. Drive gear; 42. Driven gear; 42'. Direct drive driven gear; 43. Intermediate gear; 431. Intermediate gear pivot; 432. Intermediate gear mounting pin; 5. Mounting bracket; 5a. First mounting bracket; 5b. Second mounting bracket. 2. Mounting bracket; 51a. First inner bracket; 51b. Second inner bracket; 511. First hole; 512. Second hole; 513. Third hole; 52a. First outer bracket; 52b. Second outer bracket; 521. Fourth hole; 522. Fifth hole; 523. Sixth hole; 53. First bushing; 54. Second bushing; 55. Third bushing; 56. Bracket mounting pin; 57. Blind rivet; 58. Mounting screw; 6. Torsion spring. Detailed Implementation

[0027] To address the issues of existing pedal transmission mechanisms failing to balance pedal strength and installation location requirements, this invention provides a pedal structure employing a multi-tooth transmission. This structure ensures pedal strength while accommodating various installation positions and offering flexible layout options. The following detailed description, in conjunction with accompanying drawings, illustrates this pedal structure.

[0028] See Figure 3 and Figure 4 and cooperate Figure 1 As shown, a foot pedal structure includes a foot pedal assembly 2 rotatably connected to a backrest frame assembly 1 via a foot pedal pivot 21, and a multi-tooth transmission mechanism that drives the foot pedal assembly 2 to rotate via a motor 3. The multi-tooth transmission mechanism includes an active tooth 41, a passive tooth 42, and an intermediate tooth 43. The active tooth 41 is coaxially fixed to the output shaft 31 of the motor 3, the passive tooth 42 is coaxially fixed to the foot pedal pivot 21, and the intermediate tooth 43 meshes between the active tooth 41 and the passive tooth 42. Preferably, the active tooth 41 and the intermediate tooth 43 are gears, while the passive tooth 42 is preferably a toothed plate. It only needs to be adapted to the rotation angle range of the foot pedal assembly 2, and does not need to be a full rotation, thus saving space occupied in the seat thickness direction.

[0029] This pedal structure employs a multi-tooth transmission, which offers greater stability than a crank-connecting rod transmission, ensuring the strength requirements of the pedal structure. Furthermore, the addition of the intermediate tooth 43 allows for more flexible installation options and accommodates various pedal positions. Specifically... Figure 4To illustrate: The blue, red, and green circles in the diagram represent the active tooth 41, passive tooth 42, and intermediate tooth 43 in the multi-tooth transmission mechanism of this solution. The blue and black circles represent the active tooth 41 and direct-drive passive tooth 42' when using a direct-drive gear transmission mechanism. Position O2 is the set installation position of the pedal structure, i.e., the position of the pedal shaft 21. Since the specifications and installation position of the motor 3 used to drive the pedal structure are usually determined (i.e., the position of O1 and the size of R1 are determined), the radius R2' of the direct-drive passive tooth 42' is uniquely determined to meet the installation position requirements of the pedal structure and the meshing relationship between the active tooth 41 and the direct-drive passive tooth 42', and there are no other possible choices. As is common knowledge, given a fixed motor specification, the minimum transmission ratio requirement of the gear transmission mechanism can be derived based on the limit of the motor's load capacity. This uniquely determined direct-drive passive tooth 42' may be too small to meet the minimum transmission ratio requirement, or although it meets the minimum transmission ratio requirement, its large size may prevent it from fitting the seat shape. With this Figure 4 For example, it can be clearly seen from the figure that the multi-tooth transmission mechanism of this solution, through the addition of the intermediate tooth 43, allows the center of the passive tooth 42 to fall at position O2, satisfying the installation position requirements of the pedal structure. Moreover, the passive tooth 42 can be selected to meet the minimum transmission ratio requirement (i.e., R2 / R1). However, in order to meet the installation position requirements of the pedal structure, the direct-drive passive tooth 42' can only use a larger radius R2', resulting in the width W1 occupied by the direct-drive gear transmission mechanism in the seat thickness direction being greater than the width W2 occupied by the multi-tooth transmission mechanism of this solution in the seat thickness direction.

[0030] It should be noted that the intermediate tooth 43 used is not limited to that shown in the figure. It can be larger or smaller, as long as it can simultaneously mesh between the active tooth 41 and the passive tooth 42. Of course, the size of the passive tooth 42 can also be appropriately enlarged to improve the transmission ratio and adapt to the higher requirements of the footrest structure strength, provided that the seat shape is met. Furthermore, the number of intermediate teeth is not limited to one, as long as all intermediate teeth sequentially mesh between the active tooth 41 and the passive tooth 42, and at least one intermediate tooth does not fall on the line connecting the centers of the active tooth 41 and the passive tooth 42. In summary, the multi-tooth transmission mechanism of this solution increases the flexibility of the arrangement of the teeth and can meet the requirements of more footrest installation positions and the transmission ratio of the entire transmission mechanism. Preferably, the flexibility of the multi-tooth mechanism is used to optimize the spatial layout, and the backrest frame assembly is adjusted as much as possible in the height direction to avoid direct interference in the thickness direction. This allows for partial overlap of the projections of the active tooth and the passive tooth in the thickness direction of the backrest frame assembly, such as... Figure 4The area indicated by the double arrows can absorb some of the space occupied by the transmission gear mechanism in the thickness direction of the backrest frame assembly through this overlap, in order to meet the requirements of a thinner seat design.

[0031] The above concept can be extended to any pedal installation position.

[0032] For instructions on the installation of the multi-tooth transmission mechanism and motor 3, please refer to [link / reference]. Figure 9 and Figure 10 As shown, the foot pedal structure also includes a mounting bracket 5 for rotatably connecting the two ends of the foot pedal shaft 21 to the backrest side plate 11 of the backrest frame assembly 1, and the motor 3 and the multi-tooth transmission mechanism are arranged on the same side of the mounting bracket 5.

[0033] Specifically, in coordination Figures 5-8As shown, the mounting frame 5 includes a first mounting frame 5a and a second mounting frame 5b. The first mounting frame 5a can simultaneously support and arrange the motor 3 and the multi-tooth transmission mechanism. The first mounting frame 5a includes a first inner support 51a and a first outer support 52a fixedly connected to the first inner support 51a. An accommodating space Q is formed between the first inner support 51a and the first outer support 52a for accommodating the multi-tooth transmission mechanism. The motor 3 is fixedly connected to the opposite outer side of the first outer support 52a. The first inner bracket 51a has a first hole 511, a second hole 512, and a third hole 513 respectively. The first outer bracket 52a has a fourth hole 521, a fifth hole 522, and a sixth hole 523 respectively. The corresponding end of the pedal shaft 21 passes through the second hole 512 and the accommodating space Q and is rotatably connected to the fifth hole 522. The output shaft 31 passes through the fourth hole 521 and the accommodating space Q and is rotatably connected to the first hole 511. The intermediate tooth 43 is sleeved and fixed on an intermediate tooth shaft 431. The two ends of the intermediate tooth shaft 431 are rotatably connected to the third hole 513 and the sixth hole 523 respectively. The first inner bracket 51a and the first outer bracket 52a are detachably fixedly connected by bracket mounting pins 56 at a position avoiding the accommodating space Q. The first hole 511 is fitted with a first bushing 53 for the output shaft 31 to be inserted into. The diameter of the fourth hole 521 is adapted to the diameter of the drive gear 41 so that the drive gear 41 passes through together with the output shaft 31. The second hole 512 and the fifth hole 522 are each fitted with a second bushing 54 for the corresponding end of the pedal shaft 21 to be inserted into. The third hole 513 and the sixth hole 523 are each fitted with a third bushing 55 for the corresponding end of the intermediate gear shaft 431 to be inserted into. The bushings make the corresponding rotational connection more reliable. Regarding the connection of the motor 3, screws are pre-installed on the base of the motor 3. Holes for the screws to pass through are opened on the first outer bracket 52a and the first inner bracket 51a at positions avoiding the accommodating space Q. After the screws pass through the corresponding holes of the first outer bracket 52a and the first inner bracket 51a, they are locked by the motor mounting nut 32. This connection method facilitates the installation and removal of the motor 3, and while installing the motor 3, it also enables the connection of a fixed point between the first outer bracket 52a and the first inner bracket 51a.

[0034] Preferably, the pedal axle 21 extends through the fifth hole 522, and a pedal axle mounting pin 23 is connected to the extended portion to prevent it from coming out of the fifth hole 522. The intermediate tooth axle 431 extends through the first hole 511, and an intermediate tooth mounting pin 432 is connected to the extended portion to prevent it from coming out of the first hole 511.

[0035] For the second mounting bracket 5b, it is preferable to adopt the same structure as the first mounting bracket 5a. This facilitates the standardization of parts and adds an option for the installation of the motor 3 and the multi-tooth transmission mechanism. It is even possible to set two sets of motors 3 and multi-tooth transmission mechanisms, which are respectively installed on the first mounting bracket 5a and the second mounting bracket 5b. The rotation drive of the pedal shaft 21 is achieved by the cooperation of the two sets of motors 3 and multi-tooth transmission mechanisms. It should be noted that when only one set of motors 3 and multi-tooth transmission mechanisms is set, the first mounting bracket 5a or the second mounting bracket 5b for installing the set of motors 3 and multi-tooth transmission mechanisms is not required. Only the second bushing 54 for inserting the other end of the pedal shaft 21 needs to be embedded in the second hole 512 and the fifth hole 522.

[0036] In some preferred embodiments, the pedal assembly includes two pedal links 22, respectively fixed to the two ends of the pedal shaft 21 and located on opposite inner sides of the mounting bracket 5. Each end of the pedal shaft 21 is fitted with a torsion spring 6, and the two cantilever arms of the torsion spring 6 are respectively engaged with the corresponding pedal link 22 and the mounting bracket 5. The torsion spring 6 applies force to the cantilever arms, which is then transmitted through the pedal shaft 21 to the driven gear 42, eliminating gaps between the multi-tooth transmission mechanism and making the pedal link 22 rotate more smoothly relative to the mounting bracket 5.

[0037] The following description, using an embodiment where only the motor 3 and the multi-tooth transmission mechanism are installed at the first mounting bracket 5a, illustrates the assembly sequence of the multi-tooth transmission mechanism:

[0038] (1) such as Figure 8 As shown, the two pedal links 22 are welded together with the pedal shaft 21, and a torsion spring 6 is provided and installed on one end of the pedal shaft 21, so that the inner cantilever of the torsion spring 6 is hooked onto the adjacent pedal link 22.

[0039] (2) Provide a first bushing 53, a second bushing 54 and a third bushing 55, which are respectively installed on the first hole 511, the second hole 512 and the third hole 513 of the first inner bracket 51a and pressed together. After welding and fixing the intermediate tooth 43 and the intermediate tooth shaft 431 together, they are connected to the first inner bracket 51a by the intermediate tooth mounting nail 432. Then, the first inner bracket 51a is installed as a whole on the pedal shaft 21 at the outer position of the torsion spring 6, and the outer cantilever of the torsion spring 6 is hung on the first inner bracket 51a.

[0040] (3) Weld the passive gear 42 to the pedal shaft 21 and mesh it with the intermediate gear 43 to form a shape as shown. Figure 7 The shown is a rotating shaft welding assembly.

[0041] (4) such as Figure 6 As shown, a second bushing 54 and a third bushing 55 are provided and respectively installed on the fifth hole 522 and the sixth hole 523 of the first outer bracket 52a.

[0042] (5) Fix the active gear 41 to the output shaft 31, and then install the motor 3 and the first outer bracket 52a together with the first inner bracket 51a of the rotating shaft welding assembly through the motor mounting nut 32. At the same time, make the output shaft 31 and the active gear 41 pass through the fourth hole 521 together, so that the active gear 41 is located in the accommodating space Q and meshes with the intermediate gear 43, while the output shaft 31 continues to pass through the accommodating space Q and inserts into the first bushing 53 in the first hole 511. Then, use the bracket mounting nail 56 to lock the first inner bracket 51a and the first outer bracket 52a together.

[0043] (6) Provide another torsion spring 6 and install it on the end of the rotating shaft welding assembly away from the motor 3, and hook the inner cantilever of the torsion spring 6 onto the adjacent pedal link 22.

[0044] (7) Provide two second bushings 54 and install them on the second hole 512 of the second inner bracket 51b and the fifth hole 522 of the second outer bracket 52b respectively. Then install the second inner bracket 51b and the second outer bracket 52b sequentially on the pedal shaft 21 at the outer position of the torsion spring 6, and lock the second inner bracket 51b and the second outer bracket 52b together with the bracket mounting nail 56. At the same time, hang the other cantilever of the torsion spring 6 on the second inner bracket 51b.

[0045] (8) Insert the foot pedal pivot mounting pins 23 into both ends of the pivot welding assembly and block the opposite sides of the second inner bracket 51b and the second outer bracket 52b, forming as shown in the figure. Figure 5 The pedal structure shown.

[0046] (9) such as Figure 9 As shown, the foot pedal structure is finally placed between the two backrest side plates 11 of the backrest frame assembly 1. The second inner bracket 51b and the second outer bracket 52b on the foot pedal structure are installed and fixed to the rear end of the two backrest side plates 11 respectively by mounting screws 58. At the same time, the second inner bracket 51b and the second outer bracket 52b on the foot pedal structure are installed and fixed to the front end of the two backrest side plates 11 respectively by pop rivets 57, forming the combined state shown in 10.

[0047] After assembly, the motor 3 is powered on. The driving gear 41 drives the intermediate gear 43 to rotate, the intermediate gear 43 drives the driven gear 42 to rotate, and the driven gear 42 drives the foot pedal shaft 21 to rotate together, thereby realizing the flipping movement of the foot pedal assembly 2 relative to the backrest frame assembly 1. Figure 3 As shown, Figure 3The upper image shows the pedal assembly 2 in the unfolded state, and the lower image shows the pedal assembly 2 in the retracted state.

[0048] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. Those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention, and the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. A pedal structure, characterized in that, It includes a foot pedal assembly that is rotatably connected to the backrest frame assembly via a foot pedal pivot, and a multi-tooth transmission mechanism that drives the foot pedal assembly to rotate via a motor. The multi-tooth transmission mechanism includes a driving tooth coaxially fixed to the output shaft of the motor, a driven tooth coaxially fixed to the pedal shaft, and at least one intermediate tooth meshing between the driving tooth and the driven tooth.

2. The pedal structure as described in claim 1, characterized in that, The outer peripheries of the active tooth and the passive tooth are spaced apart from each other, and the projections of the active tooth and the passive tooth in the thickness direction of the backrest frame assembly partially overlap.

3. The pedal structure as described in claim 1, characterized in that, It also includes a mounting bracket for rotatably connecting the two ends of the foot pedal shaft to the backrest side plate of the backrest frame assembly, wherein the motor and the multi-tooth transmission mechanism are arranged on the same side of the mounting bracket.

4. The pedal structure as described in claim 3, characterized in that, The mounting bracket includes an inner bracket and an outer bracket fixedly connected to the inner bracket, and an accommodating space is formed between the inner bracket and the outer bracket for accommodating the multi-tooth transmission mechanism.

5. The pedal structure as described in claim 4, characterized in that, The motor is fixedly connected to the opposite side of the outer bracket, and the output shaft of the motor passes through the outer bracket and the accommodating space.

6. The pedal structure as described in claim 5, characterized in that, The corresponding end of the pedal pivot passes through the inner bracket and the accommodating space and is rotatably connected to the outer bracket.

7. The pedal structure as described in claim 6, characterized in that, The pedal pivot extends out of the outer bracket, and a pedal pivot mounting pin for blocking the outside of the outer bracket is connected to the protruding part.

8. The pedal structure as described in claim 4, characterized in that, The intermediate tooth is rotatably connected between the inner support and the outer support via an intermediate tooth pivot.

9. The pedal structure as described in claim 8, characterized in that, The intermediate tooth shaft extends out of the inner bracket, and the protruding part is connected to an intermediate tooth mounting pin for blocking to the inside of the inner bracket.

10. The pedal structure as described in claim 3, characterized in that, The pedal assembly includes two pedal links fixed to the two ends of the pedal shaft and located on opposite inner sides of the mounting frame. Both ends of the pedal shaft are fitted with torsion springs, one end of which is connected to the mounting frame and the other end is connected to the pedal link or the pedal shaft.

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