Patent Publication Number: US-2023133412-A1

Title: Electric pedal and linkage for the electric pedal

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     The application claims priority to Chinese Patent Application No. 202111284768.2 filed on Nov. 1, 2021, which are hereby incorporated by reference in their entireties. 
     TECHNICAL FIELD 
     The invention relates to the field of vehicle components, and in particular to an electric pedal and a linkage for the electric pedal. 
     BACKGROUND 
     A pedal is a vehicle component usually installed on a side of the vehicle. The pedal is configured to provide a step for users, and to assist the users to get on and off easily. At the same time, a side pedal can protect a side skirt of the vehicle from a direct collision in daily life, so as to protect a vehicle body. There are some vehicles whose chassis is higher from a ground, such as pickup trucks. From an ergonomic point of view, a comfortable lifting distance for people&#39;s feet is in a range from 130 mm to 180 mm. However, a step height of getting on and off the pickup trucks is usually in a range from 380 mm to 450 mm, which is far beyond the comfortable lifting range. Therefore, a pedal is provided to meet market needs, which can reduce the step height and is convenient for the users to get on and off. Furthermore, the pedal does not affect a vehicle driving and use safety. 
     SUMMARY OF THE DISCLOSURE 
     In one aspect of one embodiment the present disclosure, a linkage for an electric pedal is provided. The linkage includes a dual-output motor, a first linkage group, and a second linkage group; a first output terminal of the dual-output motor is connected to the first linkage group, and a second output terminal of the dual-output motor is connected to the second linkage group. 
     In another aspect of one embodiment of the present disclosure, an electric pedal is provided. The electric pedal includes a pedal assembly and the linkage, and the pedal assembly is connected to the linkage. 
     The linkage for the electric pedal provided by the embodiments of the present disclosure utilizes a structure of a double-shaft motor driving at two ends, and has the followings features: the linkage has a stable structure and is convenient to install. Furthermore, the linkage is arranged with a structure of a gear transmission and gears engaging with double shafts, and it has the following features: a simple structure and being reliable to drive. In addition, the electric pedal provided by the embodiments of the present disclosure utilizes a structure of a link assembly, and is capable of being stretchable. Moreover, by arranging the link assembly on a linkage group, a structure of gears matching with links is formed, which has features of a reliable transmission and a simple structure. Furthermore, through the linkage matching with the pedal assembly, it is possible to make the electric pedal synchronously lift, have a stable structure, be highly versatile, and have a reliable transmission. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In order to more clearly describe the technical solutions in the embodiments of the present disclosure, the drawings that need to be used in the description of the embodiments or the related art will be briefly described in the following. Apparently, the drawings in the following description are only some embodiments of the present disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. 
         FIG.  1    is an overall structural view of a linkage for an electric pedal according to one embodiment of the present disclosure. 
         FIG.  2    is a structural view of a first linkage group in the embodiment of  FIG.  1   . 
         FIG.  3    is a top-sectional structural view of the embodiment of  FIG.  2   . 
         FIG.  4    is a structural view of a second linkage group in the embodiment of  FIG.  1   . 
         FIG.  5    is a side-sectional structural view of the embodiment of  FIG.  4   . 
         FIG.  6    is a structural view of the electric pedal according to one embodiment of the present disclosure; 
         FIG.  7    is a structural view of connections corresponding to linkage groups being removed in the embodiment of  FIG.  6   . 
         FIG.  8    is a structural view of another embodiment of the electric pedal of the present disclosure in response to a housing of the first linkage group being removed. 
         FIG.  9    is an enlarged view of the first linkage group in the embodiment of  FIG.  8   . 
         FIG.  10    is a structural view of a first transmission assembly in the embodiment of  FIG.  8   . 
         FIG.  11    is a partial exploded structural view of the embodiment of  FIG.  10   ; 
         FIG.  12    is a side structural view of one embodiment of the electric pedal of the present disclosure in a retracted state; 
         FIG.  13    is a side structural view of the embodiment in  FIG.  12    in an extended state. 
     
    
    
     DETAILED DESCRIPTION 
     Embodiments and drawings of the present disclosure will be described in detail below. It would be understood that the embodiments described below with reference to the drawings are illustrative and are intended to explain the present disclosure, and cannot be construed as a limitation to the present disclosure. Similarly, the following embodiments are only a part of the embodiments of the present disclosure, but not all of embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present disclosure. 
     Reference to “embodiments” herein means that a specific feature, structure, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present disclosure. The appearance of the phrase in various places in the disclosure does not necessarily refer to the same embodiment, nor is an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art clearly and implicitly understand that the embodiments described herein can be combined with other embodiments. 
     Referring to  FIG.  1   , which is an overall structural view of a linkage for an electric pedal according to one embodiment of the present disclosure. It should be noted that an electric pedal  20  in the present disclosure may be used to a carrier including a door opening and closing structure. Specifically, the electric pedal  20  may be arranged on a side of a vehicle body  30  (as shown in  FIG.  12   ), so that it is possible to facilitate people getting on and off. Of course, the electric pedal  20  of the embodiments may also be arranged on a rear of the vehicle body  30  or other parts, or even on other carriers except the vehicle, which is not specifically limited herein. A linkage  10  for the electric pedal  20  according to the embodiment of the present disclosure includes, but is not limited to, a dual-output motor  100 , a first linkage group  200 , a second linkage group  300 , transmission members  400 , and connections  500 . In addition, the dual-output motor  100  may be a motor, whose two ends are provided with a first output terminal  102  and a second output terminal  104 , that is to say, the dual-output motor  100  is provided with two sides, and one side of the dual-output motor  100  is provided with the first output terminal  102 , and another side of the dual-output motor  100  is provided with the second output termina 1104 . In addition, the first output terminal  102  and the second output terminal  104  are synchronously output and output directions are the same. In addition, the first output terminal  102  and the second output terminal  104  may output a power through structures of output shafts. It would be understood that in other embodiments of the present disclosure, the output directions of the first output terminal  102  and the second output terminal  104  of the dual-output motor  100  may also be different from each other. The first linkage group  200  and the second linkage group  300  are arranged on two sides of the dual-output motor  100 , that is to say, the first linkage group  200  is connected to the first output terminal  102  of the dual-output motor  100 , and the second linkage group  300  is connected to the second output terminal  104  of the dual-output motor  100 . 
     The first linkage group  200  includes a first input part  210 , a first transmission part  260 , and a first output part  240 . The first input part  210  is connected to the first output terminal  102  of the dual-output motor  100 , in order to transmit a power outputted by the dual-output motor  100  from the first output terminal  102  to the first linkage group  200 . The first transmission part  260  is connected to the first input part  210  and the first output part  240 . The first transmission part  260  is configured to change a direction of a power inputted by the first input part  210  and transmit the power to the first output part  240 . The first output part  240  is configured to output a power converted and transmitted by the first transmission part  260 . 
     The second linkage group  300  includes a second input part  310 , a second transmission part  360 , and a second output part  340 . The second input part  310  is connected to the second output terminal  104  of the dual-output motor  100 , so as to transmit the power outputted by the dual-output motor  100  from the second output terminal  104  to the second linkage group  300 . The second transmission part  360  is connected to the second input part  310  and the second output part  340 . The second transmission part  360  is configured to change a direction of a power inputted by the second input part  310 , and transmit the power to the second output part  340 . The second output part  340  is configured to output the power converted and transmitted by the second transmission part  360 . 
     In this embodiment, the linkage  10  is capable of synchronously outputting a power in the same direction at the two ends of the dual-output motor  100  via matching structures of the dual-output motor  100 , the first linkage group  200 , and the second linkage group  300 , so that it is possible to make the electric pedal  20  provided with the linkage  10  synchronously lift and have a stable structure. It should be understood that in other embodiments of the present disclosure, output directions of the first linkage group  200  and the second linkage group  300  may not be the same direction, which is not specifically limited herein. In the embodiment of the present disclosure, the first linkage group  200  and the second linkage group  300  can realize force transmission and conversion through a gear group structure or through a linkage group structure to achieve force transmission and conversion, or through other structures to achieve force transmission and conversion, which is not specifically limited herein. 
     In this embodiment, the transmission members  400  includes a first transmission member  420  and a second transmission member  440 . The first transmission member  420  may be arranged between the first linkage group  200  and the dual-output motor  100 , and the second transmission member  440  may be arranged between the second linkage group  300  and the dual-output motor  100 , in order to synchronously transmit an power outputted by the dual-output motor  100  to the first linkage group  200  and the second linkage group  300  arranged on the two sides. The first input part  210  of the first linkage group  200  is provided with a first fixed protrusion  212 , and the second input part  310  of the second linkage group  300  is provided with the second fixed protrusion  312 . A first junction  422  is arranged between the first transmission member  420  and the first input part  210 , and the first junction  422  is provided with a thread structure. Similarly, a second junction  442  is arranged between the second transmission member  440  and the second input part  310 , and the second junction  442  is also provided with the thread structure. When assembling, it is possible to realize a connection of the first transmission member  420  and the first input part  210  by inserting a screw to press the first protrusion  212 . Similarly, it is also possible to realize a connection of the second transmission member  440  and the second input part  310  by inserting a screw to press the second protrusion  312 . In other embodiments of the present disclosure, the first linkage group  200  may also be connected to the first transmission member  420  by bolted connections, locking connections, and the like. Similarly, the first linkage group  300  may also be connected to the second transmission member  440  by the same way as that of the first linkage group  200  connected to the first transmission member  440 , which will not be repeated herein. In the embodiment of the present disclosure, the linkage  10  may be assembled on different carriers by replacing the transmission members  400  with different specifications, thereby improving a versatility of the linkage  10  and the electric pedal  20  with the linkage  10 . 
     In this embodiment, the linkage  10  further includes the connections  500 . The connections  500  may be fixing brackets. The connections  500  are configured to fix the dual-output motor  100 , the first linkage group  200 , and the second linkage group  300  on the vehicle body  30 . It should be understood that the connections  500  are elements configured to fix the linkage  10  on the carrier. In other embodiments of the present disclosure, the connections  500  may also be other elements that may be capable of connecting and fixing. It would be understood that the connections  500  may be omitted in other embodiments, for example, when the linkage  10  is matching with the carrier provided with connecting and fixing structure, or when the electric pedal  20  is arranged with a component structured to connect and fix. 
     It should be noted that terms “including” and “having” in the embodiments of the present disclosure and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but includes unlisted steps or units in some embodiments, or also includes other steps or components inherent to these processes, methods, products or equipment in some embodiments. 
     Further, referring to  FIG.  2    to  FIG.  5   ,  FIG.  2    is a structural view of the first linkage group  200  in the embodiment in  FIG.  1   , and  FIG.  3    is a top-sectional structural view in the embodiment of  FIG.  2   . In some embodiments, the first transmission part  260  includes a first switching gear  220  and a first transmission gear  230 . More specially, in some embodiments, the first transmission gear  230  includes a first sub-transmission gear  230   a  and a second sub-transmission gear  230   b,  and the first output part  240  includes a first sub-output part  240   a  and a second sub-output part  240   b.  The first input part  210  is configured to transmit the power outputted by the dual-output motor  100  from the first output terminal  102  to the first switching gear  220  of the first linkage group  200 . The first switching gear  220  is driven to rotate by the first input part  210 , so that the first switching gear  220  may transmit the power to the first sub-transmission gear  230   a.  The first sub-transmission gear  230   a  is connected to the first switching gear  220 . More specifically, the first sub-transmission gear  230   a  and the second sub-transmission gear  230   b  are connected in parallel on the same plane, and a plurality of gear teeth of the first sub-transmission gear  230   a  are engaged with a plurality of gear teeth of the second sub-transmission gear  230   b,  so as to drive the second sub-transmission gear  230   b  to rotate and a rotational direction of the second sub-transmission gear  230   b  is opposite to that of the first sub-transmission gear  230   a.  For example, when the first sub-transmission gear  230   a  rotates in an anticlockwise direction (the embodiment shown in  FIG.  2    is viewed from top to bottom), to drive the second sub-transmission gear  230   b  to rotate in a clockwise direction (the embodiment shown in  FIG.  2    is viewed from top to bottom)), so that it is possible to make the first sub-transmission gear  230   a  and the second sub-transmission gear  230   b  rotate in opposite directions. The first sub-transmission gear  230   a  is connected to the first sub-output part  240   a,  and the second sub-transmission gear  230   b  is connected to the second output part  240   b,  so that it is possible to make the first sub-output part  240   a  and the second output part  240   b  rotate in opposite directions. It should be understood that when the dual-output motor  100  changes the output direction of a force of the first output terminal  102 , rotational directions of components of the first linkage group  200  may also change accordingly. It should be noted that the number of the switching gear  220  of the first linkage group  200  may be one or more. Similarly, the number of the sub-transmission gear  230   a  or the sub-transmission gear  230   b  may be one or more. The first switching gear  220  and the first sub-transmission gear  230   a  may be connected at a non-vertical angle. The first sub-transmission gear  230   a  and the second sub-transmission gear  230   b  may be connected in the different planes or at a non-parallel angle. It should be noted that the number and positional relationship of each of gears is not limited herein. 
     Please continue to refer to  FIG.  4    and  FIG.  5   ,  FIG.  4    is a structural view of the second linkage group in the embodiment of  FIG.  1   , and  FIG.  5    is a side-sectional structural view in the embodiment in  FIG.  4   . In this embodiment, a structure of the second linkage group  300  is substantially the same as that of the first linkage group  200 . In the linkage  10 , the first linkage group  200  and the second linkage group  300  are arranged on the two sides of the dual-output motor  100  to form a stable output structure and keep the first linkage group  200  and the second linkage group  300  output synchronously. 
     In this embodiment, the second transmission part  360  includes a second switching gear  320  and a first transmission gear  330 . More specially, in some embodiments, the second switching gear  320  includes a third sub-switching gear  320   a  and a fourth sub-switching gear  320   b,  the second transmission gear  330  includes a third sub-transmission gear  330   a  and a fourth sub-transmission gear  330   b,  and the second output part  340  includes a third sub-output part  340   a  and a fourth sub-output part  340   b.  The second input part  310  drives the third sub-adapting gear  320   a  to rotate, the third sub-switching gear  320   a  and the fourth sub-switching gear  320   b  are perpendicularly connected and gear teeth of the third sub-switching gear  320   a  and the fourth sub-switching gear  320   b  are engaged with each other, so as to drive the fourth sub-transmission gear  330   b  to rotate, thereby changing a force transmitting direction. The fourth sub-switching gear  320   b  is connected to the third sub-transmission gear  330   a,  thereby driving the third sub-transmission gear  330   a  to rotate. In addition, the third sub-transmission gear  330   a  is horizontally connected to the fourth sub-transmission gear  330   b  on the same plane and gear teeth of the third sub-transmission gear  330   a  and the fourth sub-transmission gear  330   b  are engaged with each other, so as to drive the third sub-transmission gear  330   a  and the fourth sub-transmission gear  330   b  to rotate in opposite directions. The third sub-transmission gear  330   a  is connected to the third sub-output part  340   a,  the fourth sub-transmission gear  330   b  is connected to the fourth sub-output part  340   b,  so that it is possible to drive the third output part  340   a  and the fourth output part  340   b  to rotate in opposite directions. 
     It should be noted that the outputs of the first output terminal  102  and the second output terminal  104  of the dual-output motor  100  are synchronized and the output directions are the same, so as to make of the first input part  210  and the second input part  310  have the same rotational directions. Furthermore, rotational directions of the first sub-output part  240   a  and the fourth sub-output part  340   b  are the same, and a rotational direction of the second sub-output part  240   b  is the same as that of the third sub-output part  340   a.  It should be understood that in other embodiments of the present disclosure, the rotational directions of the first output terminal  102  and the second output terminal  104  of the dual-output motor  100  can also be opposite. In addition, the number of the second switching gear  320  may be provided with two gears or a plurality of gears, and the second transmission gear  330  may be provided with two or a plurality of gears. The third sub-switching gear  320   a  and the fourth sub-switching gear  320   b  may be connected at a non-vertical angle, the third sub-transmission gear  330   a  and the fourth sub-transmission gear  330   b  may be connected in different planes, or connected non-horizontally. The number and positional relationship of the second switching gear  320  and the second transmission gear  330  are not specifically limited herein. 
     It should be noted that in the embodiments of the present disclosure, the first linkage group  200  and the second linkage group  300  are configured to transmit the power outputted by the dual-output motor  100  and change a power direction. The structures of the first linkage group  200  and the second linkage group  300  are not limited herein It should be understood that the first linkage group  200  and the second linkage group  300  may be gear sets or link assemblies capable of transmitting the power, which is not specifically limited herein. 
     Materials of the first linkage group  200  and the second linkage group  300  may be stainless steel, rigid plastic, resin or aluminum alloy, or the like, and a housing of the first linkage group  200  may be fixedly connected to a housing of the second linkage group  300  by means of screw-fixing, snap-fitting, or pasting-fixing, or the like. 
     The linkage  10  for the electric pedal  20  provided by the embodiments of the present disclosure utilizes a structure of the double-shaft motor driving at the two ends, and has the following feature: a stable structure, and being convenient to install. Furthermore, the linkage  10  is arranged with a structure of gears transmission and gears engaging with shafts, and it has the followings features: a simple structure and being reliable to drive. 
     It should be noted that terms such as “first”, “second”, and the like are used herein for purposes of description, and are not intended to indicate or imply relative importance or significance or to imply the number of indicated technical features. Thus, the feature defined with “first”, “second”, and the like may include one or more of such a feature. In the description of the present disclosure, “a plurality of” means two or more, such as two, three, and the like, unless specified otherwise. 
     Referring to  FIG.  6    and  FIG.  7   ,  FIG.  6    is a structural view of the electric pedal according to one embodiment of the present disclosure, and  FIG.  7    is a structural view of the connections corresponding to the linkage groups being removed in the embodiment of  FIG.  6   . In some embodiments, the electric pedal  20  includes the linkage  10 , a first transmission assembly  600 , a second transmission assembly  700 , and a pedal element  800 . The first transmission assembly  600  and the second transmission assembly  700  are telescopic link assemblies. Furthermore, the first transmission assembly  600  is connected to the first linkage group  200 , and the second transmission assembly  700  is connected to the second linkage group  300 . In the case, an extension and retraction of the first transmission assembly  600  and the second transmission assembly  700  are controlled by changing the output power directions of the first linkage group  200  and the second linkage group  300 . The first transmission assembly  600  and the second transmission assembly  700  are also connected to the pedal element  800 , so that the electric pedal  20  can control an expansion and retraction of the pedal element  800  by controlling the expansion and retraction of the first transmission assembly  600  and the second transmission assembly  700 . In a specific implementation embodiment, the linkage  10  may be fixed on an inner side of the vehicle body  30  through the connections  500 , and the pedal element  800  may be located on an outer side of the vehicle body  30 , so that an expansion and retraction of the electric pedal  20  may be controlled by controlling the expansion and retraction of the first transmission assembly  600  and the second transmission assembly  700 . At the same time, it is possible to make the linkage  10  reduce space of the outer side of vehicle body  30 . 
     At present, a base structure of a conventional electric pedal is metal, steel or aluminum alloy, and the conventional electric pedal is driven by a single motor. When opening a vehicle door, a system of the conventional electric pedal detects a switch of the vehicle door, so that a bracket is driven to expand and retract via the single motor, and the conventional electric pedal is lowered to a suitable position, thus it is convenient for people to get on and off. However, the features of the conventional electric pedal: only one motor is arranged on one side of the vehicle body, the single motor is installed together with a multi-link structure, and a bracket, which is not connected to an end of the motor, keeps extend and retract synchronously through a bracket linkage. In this case, a design of the conventional electric pedal has the following disadvantages: during a process of the pedal lifting up and down, it is easy to make two sides of a multi-link bracket be out of sync, which causes the pedal surface to tilt. 
     The electric pedal  20  provided by the embodiments of the present disclosure is driven by a dual-shaft drive structure of the dual-output motor  100  and matches with a structure of the gears matching with the links to realize synchronous and stable lifting of the electric pedal  20 . The disclosure provides an electric side pedal provided with a unique and stable structure and being high performance to cost ratio. Furthermore, a transmission structure of the electric pedal is provided with a simple installation, a stable structure and a low failure rate, to ensure that a motor torque is uniformly transmitted from a middle position to a front telescopic bracket and a rear telescopic bracket, that is to say, the front telescopic bracket may be the first transmission assembly  600 , and the rear telescopic bracket may be the second transmission assembly  700 . 
     In a specific application scenario provided by the embodiment of the present application, the dual-output motor  100 , the first linkage group  200 , and the second linkage group  300  are arranged on the connections  500 , that is to say, in some embodiments, the connections  500  include a first connection  510 , a second connection  520 , and a third connection  530 . Furthermore, the dual-output motor  100  is arranged on the first connection  510 , the first linkage group  200  is arranged on the second connection  520 , and the second linkage group  300  is arranged on the third connection  530 . More specifically, the connections  500  are fixed on the carrier, and the first linkage group  200  and the second linkage group  300  are arranged on the two sides of the dual-output motor  100  and are connected to the dual-output motor  100 , in other words, the first linkage group  200  is connected to the first output terminal  102  of the dual-output motor  100 , and the second linkage group  300  is connected to the second output terminal  104 . When the dual-output motor  100  located in the middle position of the electric pedal  20  is energized, a torsional force is transmitted to the first linkage group  200  and the second linkage group  300 , that is to say, the torsional force is transmitted to the first linkage group  200  via the first output terminal  102  of the dual-output motor  100 , and the torsional force is transmitted to the second linkage group  300  via the second output terminal  104  of the dual-output motor  100  at the same time, so as to make a direction of the torsional force change, thereby driving the first transmission assembly  600  and the second transmission assembly  700  to move, and driving the pedal element  800  to extend or retract. At the same time, in the embodiments of the present disclosure, it is possible to adapt to a variety of vehicle models by changing specifications of the transmission elements  400  and the connections  500 , and be highly versatile. The dual-output motor  100  is located in a middle position of the vehicle body  30 , so as to save space of a bracket, reduce a total weight of the bracket, and be conveniently to install. In addition, the electric pedal  20  has a simple structure and is easy to maintain. 
     Further, referring to  FIG.  8    and  FIG.  9   ,  FIG.  8    is a structural view of another embodiment of the electric pedal of the present disclosure in response to a housing of the first linkage group being removed, and  FIG.  9    is an enlarged view of the first linkage group in the embodiment of  FIG.  8   . As shown in  FIG.  8   , the electric pedal  20  is in a retracted state, and the first transmission assembly  600  and the second transmission assembly  700  are in a retracted state at the same time. In this embodiment, the first linkage group  200  further includes a first sub-switching gear  220   a,  a second sub-switching gear  220   b,  the first sub-transmission gear  230   a,  and the second sub-transmission gear  230   b.  The first sub-switching gear  220   a  is driven to rotate by the first input part  210 , and drives the second sub-switching gear  220   b  that is perpendicularly connected to the first sub-switching gear  220   a  to rotate, thereby driving the first sub-transmission gear  230   a  that is coaxially connected to the second sub-switching gear  220   b  to rotate; in this case, the second sub-transmission gear  230   b,  which is connected in parallel to the first sub-transmission gear  230   a  on a same plane, is driven to rotate in an opposite direction, thereby outputting forces in an opposite direction by the first sub-output part  240   a  and the second sub-output part  240   b,  thereby controlling the an extension or a contraction of the first transmission assembly  600 , and thereby controlling the pedal element  800  to extend or contract. Structures of the first linkage group  200  and the second linkage group  300  are substantially the same, and the number of gears and the positional relationship are not specifically limited herein. 
     Further, referring to  FIG.  10    and  FIG.  11   ,  FIG.  10    is a structural view of the first transmission assembly in the embodiment of  FIG.  8   , and  FIG.  11    is a partial exploded structural view of the embodiment in  FIG.  10   . In some embodiments, the first transmission assembly  600  includes a first link  610 , a second link  620 , a third link  630 , a fourth  640 , and a first bearing component  650 . The first link  610  and the second link  620  are pivotally connected, and the third connecting rod  630  and the fourth link  640  are pivotally connected. In addition, the first link  610  and the third link  630  are connected to the first linkage group  200 , and the second link  620  and the fourth link  640  are connected to the first bearing component  650 , so as to connect to the pedal element  800 , so that it is possible to control a power transmission to an opposite direction of the first link  610  and the third link  630 , thereby controlling the extension and retraction of the transmission assembly  600 . It should be noted that in this embodiment, the first link  610  is pivotally connected to the second link  620  by a bolt  601 , and the third link  630  is also pivotally connected to the fourth link  640  via a second bolt  602 . In other embodiments of the present disclosure, links are also pivotally connected by links connecting to annulus and the like, which is not specifically limited herein. 
     Specifically, referring to  FIG.  2   , the first transmission assembly  600  is connected to the first linkage group  200  in a first accommodating groove  250  defined by the first linkage group  200 . The first link  610  is connected to the first sub-output part  240   a,  and the third link  630  is connected to the second output part  240   b.  More specifically, the first sub-output part  240   a  penetrates a first hole of the first link  610  to make the first link  610  clamped in a first groove of the first sub-output part  240   a,  and the second sub-output part  240   b  penetrates a second hole of the third link  630  to make the third link  630  clamped in a second groove of the second sub-output part  240   b,  so that it is possible that the first transmission assembly  600  is driven to move by the first linkage group  200 . Further, the electric pedal  20  controls the output directions of the first sub-output part  240   a  and the second sub-output part  240   b  through the dual-output motor  100 , thereby controlling the extension and retraction of the first transmission assembly  600 , so that it is possible to control the extension and retraction of the pedal element  800 . 
     It should be noted that, in the embodiment of the present disclosure, side walls of the first link  610 , the second link  620 , the third link  630 , and the fourth link  640  may be hollow so as to reduce weight, thereby reducing a weight of the electric pedal  20  and prolonging a service life of the electric pedal  20 . Elastic bumps are respectively arranged on the side walls of the first link  610 , the second link  620 , the third link  630 , and the fourth link  640 , so as to improve a stability of the first transmission assembly  600  being in the extended state, and at the same time, collisions between the above links can be buffered during the transition of the first transmission assembly  600  from the retracted state to the extended state. 
     The second transmission assembly  700  in the embodiment of the present disclosure includes a fifth link  710 , a sixth link  720 , a seventh link  730 , an eighth link  740 , and a second bearing component  750 . The second transmission assembly  700  and the first transmission assembly  600  have substantially the same structures. The second transmission assembly  700  is connected to the second linkage group  300  in a second accommodating groove  350  defined by the second linkage group  300 , and the connection way of the second transmission assembly  700  being connected to the second linkage group  300  is substantially the same as that of the first transmission assembly  600  being connected to the linkage group  200 , which is not repeated herein. 
     Referring to  FIG.  12    and  FIG.  13   ,  FIG.  12    is a side structural view structural view of one embodiment of the electric pedal of the present disclosure in a retracted state, and  FIG.  13    is a structural side view of the embodiment in  FIG.  12    in an extended state. In some embodiments, the linkage  10  of the embodiment is arranged on the inner side of the vehicle body  30 , and the pedal element  800  is arranged on the outer side of the vehicle body  30 . In this case, the linkage  10  controls the extension and retraction of the first transmission assembly  600  and the second transmission assembly  700 , thereby controlling the extension and retraction of the pedal element  800 . In this way, the linkage  10  is arranged on the inner side of the vehicle body  30 , and the dual-output motor  100  is arranged on a middle of the linkage  10 . Furthermore, when the pedal element  800  is retracted, only the pedal element  800  is exposed on the outer side of the vehicle body  30 , so as to save the space, raise the stability, and protect the vehicle body  30 . 
     In the description of the present disclosure, it is to be understood that terms such as “top”, “bottom”, “right”, “front”, “rear”, “left”, “inner”, “outer”, and the like, refer to the orientations and locational relations illustrated in the accompanying drawings. Thus, these terms used here are only for describing the present disclosure and explain a relative positional relationship and movement between the components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, a directional indication will change accordingly. 
     The linkage  10  for the electric pedal  20  provided by the embodiments of the present disclosure utilizes the structure of the double-shaft motor  100  driving at the two ends, and has the followings features: a stable structure and is convenient to install. Furthermore, the linkage  10  is arranged with a structure of the gears transmission and the gears engaging with the shafts, and it has the following features: a simple structure and being reliable to drive. In addition, the electric pedal  20  provided by the embodiments of the present disclosure utilizes the structures of the first transmission assembly  600  and the second transmission assembly  700 , and is capable of being stretchable. Moreover, by arranging the first transmission assembly  600  in the first linkage group  200  and arranging the second linkage assembly  700  in the second linkage group  300 , a structure of gears matching with links is formed, which has the features of the reliable transmission and the simple structure. Furthermore, through the linkage  10  matching with the pedal assembly  800 , it is possible to make the electric pedal  20  synchronously lift, have a stable structure, be highly versatile, and the reliable transmission. 
     The descriptions of the present disclosure are only a part of the embodiments of the present disclosure, which do not limit the scope of protection of the present disclosure. Any equivalent device or equivalent process transformation made using the content of the descriptions and drawings of the present disclosure, or directly or indirectly used in other related technical fields, is included in the scope of patent protection of the present disclosure.