CN112721882B - Brake pedal - Google Patents

Abstract

The invention provides a brake pedal, which belongs to the technical field of automobiles. It solves the problem that the change rate of the pedal lever ratio is small during the braking process of the existing brake pedal. The brake pedal includes a pedal bracket, a pedal arm, a connecting rod, a swing arm and a booster push rod. The pedal arm is hingedly connected to the pedal bracket through the first hinge shaft, and the lower end of the swing arm is hinged to the pedal bracket through the second hinge shaft. One end of the push rod is hingedly connected to the upper end of the swing arm through the hinge shaft 3, the swing arm is provided with an arc-shaped groove, and one end of the connecting rod has a driving member that is slidably arranged in the arc-shaped groove and can push the swing arm to swing. The other end of the rod is attached to the pedal arm. The brake pedal can improve vehicle braking system performance, reduce braking distance and optimize brake pedal feel.

Description

a brake pedal

technical field

The invention belongs to the technical field of automobiles, and particularly relates to a brake pedal.

Background technique

The brake pedal is an important part of the human-machine closed-loop system between the driver and the whole vehicle. The driver perceives the braking feeling of the vehicle through the brake pedal and controls the braking intensity of the vehicle. The pedal arm of the traditional brake pedal directly pushes with the booster. Rod connection, the movement process of the mechanism is that the driver steps on the brake pedal, the pedal arm rotates around the fixed point, directly pushes the booster push rod, and realizes the transmission of pedal force. Therefore, after the pedal structure design is finalized, the lever ratio is a fixed value during the entire pedal stroke process. Due to factors such as the idle stroke of the braking system and the small pressure of the initial braking system pipeline, the pedal force is small in the initial stage of the pedal, but the stroke is small. If the braking force is large, the braking force response is not timely, and the braking distance of the vehicle increases. In the later stage, the pedal force is large, but the stroke is small, which leads to a poor pedal feel when the whole vehicle is braking.

制动踏板在工作过程中，第一转轴与踏板之间的距离Ra、第二转轴与第三销轴之间的距离Rc、第二转轴与第二销轴之间的距离Rd均不变，仅第一转轴与第二销轴之间的距离Rb发生变化，因此制动踏板杠杆比为反比例函数，当第一转轴与第二销轴之间的距离Rb变大时，制动踏板杠杆比变小，当第一转轴与第二销轴之间的距离Rb变小时，制动踏板杠杆比变大，但是在整个制动过程中，第一转轴与第二销轴之间的距离Rb变化非常小，进而使得整个制动踏板杠杆比的变化范围非常有限，进而与传统踏板结构的相比，整车制动过程中的制动响应和踏板感状态变化并无十分明显的差异，对踏板感状态的改善远远不足。At present, China Patent Network has disclosed an anti-intrusion variable lever ratio brake pedal [authorization announcement number: CN206954209U], which includes a pedal, a pedal arm connected to the pedal, a pedal mounting bracket, and a two-force rod and a swing rod. , booster push rod, anti-invasion bracket, the upper end of the pedal arm is connected with the lower end of the anti-intrusion bracket through the first rotating shaft, the upper end of the anti-intrusion bracket is fixed, and the upper side of the pedal arm passes through the first pin shaft and the second force rod. The right end is connected, the left end of the two-force rod is connected with the swing rod through the second pin shaft, the lower end of the swing rod and the pedal mounting bracket are fixed by the rotating shaft, and the uppermost end of the swing rod is connected with the booster push rod through the third pin shaft. A support arm extending toward the anti-intrusion bracket is arranged on the right side of the upper end of the swing rod, and the right end of the support arm is in contact with the anti-intrusion bracket. The distance between the first shaft and the pedal is Ra, the distance between the first shaft and the second pin is Rb, the distance between the second shaft and the third pin is Rc, and the distance between the second shaft and the second pin is Rc. The distance between is Rd and the brake pedal lever ratio is

During the working process of the brake pedal, the distance Ra between the first rotating shaft and the pedal, the distance Rc between the second rotating shaft and the third pin shaft, and the distance Rd between the second rotating shaft and the second pin shaft remain unchanged, Only the distance Rb between the first shaft and the second pin changes, so the brake pedal lever ratio is an inversely proportional function. When the distance Rb between the first shaft and the second pin becomes larger, the brake pedal lever ratio becomes smaller, when the distance Rb between the first shaft and the second pin becomes smaller, the brake pedal lever ratio becomes larger, but during the entire braking process, the distance Rb between the first shaft and the second pin changes It is very small, so that the change range of the entire brake pedal lever ratio is very limited, and compared with the traditional pedal structure, there is no obvious difference in the braking response and pedal feeling state changes during the braking process of the whole vehicle. The improvement of the state of feeling is far from enough.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the above problems in the prior art, and propose a brake pedal. The technical problem to be solved by the present invention is: how to solve the problem that the pedal lever ratio changes in a small range during the braking process.

The object of the present invention can be realized through the following technical solutions:

A brake pedal includes a pedal bracket, a pedal arm, a connecting rod, a swing arm and a booster push rod, the pedal arm is hingedly connected to the pedal bracket through a first hinge shaft, and the lower end of the swing arm is connected to the pedal through a second hinge shaft The bracket is hingedly connected, and one end of the booster push rod is hingedly connected to the upper end of the swing arm through the hinge shaft 3. A drive member inside the arc-shaped groove and capable of pushing the swing arm to swing, and the other end of the connecting rod is fixed on the pedal arm.

驾驶员脚踩踏板，使得踏板臂向前摆动，由于连杆的另一端与踏板臂连接并且使得连杆定位在踏板臂上，连杆随踏板臂同步动作，连杆整体向前移动，同时连杆与摆臂相连接的一端向上抬起，使得驱动件沿着圆弧形槽向上滑动，进而推动摆臂向前摆动，带动助力器推杆向前移动。在整个制动过程中，踏板臂的转动半径Ra、铰接轴一与驱动件之间的直线距离Rb、铰接轴二与铰接轴三之间的直线距离Rc均不变，由于驱动件沿着圆弧形槽向上滑动，而铰接轴二位置始终保持不变，使得铰接轴二与驱动件之间的直线距离Rd逐渐变大，进而使得制动踏板杠杆比逐渐变大，本结构中的铰接轴二与驱动件之间的直线距离Rd变化范围远大于现有技术中第一转轴与第二销轴之间的距离Rb的变化范围，并且本结构的制动踏板杠杆比是与Rd相关的正比例函数，当铰接轴二与驱动件之间的直线距离Rd越大时，制动踏板杠杆比越大，进而显著提高了踏板杠杆比的变化范围，明显改善整车制动过程中的踏板感状态变化，提高车辆制动系统性能、降低制动距离和优化制动踏板感。In this structure, the turning radius of the pedal arm is Ra, the linear distance between the first hinge shaft and the driving member is Rb, the linear distance between the second hinge shaft and the third hinge shaft is Rc, and the distance between the second hinge shaft and the driving member is Rc. The straight line distance is Rd and the brake pedal lever ratio is

The driver steps on the pedal, so that the pedal arm swings forward. Since the other end of the connecting rod is connected with the pedal arm and the connecting rod is positioned on the pedal arm, the connecting rod moves synchronously with the pedal arm, and the connecting rod moves forward as a whole. The end of the rod connected to the swing arm is lifted upwards, so that the driving member slides up along the arc-shaped groove, thereby pushing the swing arm to swing forward, and driving the push rod of the booster to move forward. During the whole braking process, the rotation radius Ra of the pedal arm, the straight-line distance Rb between the hinge shaft 1 and the driving member, and the straight-line distance Rc between the hinge shaft 2 and the hinge shaft 3 remain unchanged. The arc-shaped groove slides upward, and the position of the second hinge shaft remains unchanged, so that the linear distance Rd between the second hinge shaft and the driving member gradually increases, thereby making the lever ratio of the brake pedal gradually increase. The hinge shaft in this structure The variation range of the linear distance Rd between the two and the driving member is much larger than the variation range of the distance Rb between the first rotating shaft and the second pin shaft in the prior art, and the brake pedal lever ratio of this structure is proportional to Rd function, when the linear distance Rd between the second hinge shaft and the driving part is larger, the lever ratio of the brake pedal is larger, which in turn significantly increases the variation range of the lever ratio of the pedal and significantly improves the pedal feel during the braking process of the whole vehicle. Changes to improve vehicle braking system performance, reduce braking distance and optimize brake pedal feel.

In the above-mentioned brake pedal, the circular arc groove is arranged along the length direction of the swing arm, and the convex side of the circular arc groove faces the connecting rod.

Through the arrangement of this structure, during the forward swing of the pedal arm, it is ensured that the driving member slides upward along the arc-shaped hole or the arc-shaped groove, so that the end of the connecting rod connected with the swing arm is lifted upwards.

In the above-mentioned brake pedal, the connecting rod is disposed inclined downward, and the end of the connecting rod connected with the swing arm faces downward. Through the arrangement of this structure, in the initial stage of the pedal arm swinging forward, the connecting rod is inclined downward and the pedal lever is relatively small, which can effectively reduce the pedal stroke and realize rapid braking; when the pedal arm swings forward In the middle section, the connecting rod is in a horizontal state and the pedal lever becomes larger. At this time, the minimum pedal force can be applied to obtain a greater braking effect; in the rear section of the pedal arm swinging forward, the connecting rod is inclined upward at this time. Setting, the pedal force required for braking gradually increases, so that the pedal feel state is significantly improved.

In the above-mentioned brake pedal, the driving member is a pin shaft, and the pin shaft is inserted into the arc-shaped groove. Through the arrangement of the structure, in the process of the pedal arm swinging forward, the pin shaft slides up along the arc-shaped groove and also pushes the swing arm to swing forward.

In the above-mentioned brake pedal, the brake pedal further comprises an arc-shaped plastic part embedded in the arc-shaped groove, an arc-shaped slideway is provided on the plastic part, and the pin shaft Set through the arc-shaped chute. Through the arrangement of this structure, the pin shaft slides along the arc-shaped slideway to avoid direct contact between the pin shaft and the hole wall of the arc-shaped hole, which causes the pin shaft and the hole wall of the arc-shaped hole to be easily worn. After the inner wall of the channel is worn, take out the plastic part from the arc-shaped hole and replace it with a new plastic part.

In the above-mentioned brake pedal, an oil storage groove is provided on the inner wall of the arc-shaped slideway and the pin shaft abuts against, and the oil storage groove is arranged along the arc direction of the arc-shaped slideway. Through the arrangement of this structure, after the brake pedal is assembled, the oil storage tank is filled with lubricating oil to provide lubrication for the sliding of the pin shaft in the arc-shaped slideway, so that the sliding of the pin shaft is smoother, and at the same time, the pin shaft and the pin shaft are reduced. Wear of plastic parts.

In the above-mentioned brake pedal, the brake pedal further comprises a fourth hinge shaft, a fifth hinge shaft and a fixing bracket, one end of the connecting rod is connected to the pedal arm through the fourth hinge shaft, and the upper end of the fixing bracket is fixed on the pedal arm. On the first hinge shaft or the pedal arm, the middle part of the connecting rod is connected with the lower end of the fixed bracket through the fifth hinge shaft. Through the arrangement of this structure, the pedal arm, the fixed bracket and the connecting rod are in a triangular structure, and the triangle has stability, so that the connecting rod will not rotate around the hinge axis 4 , and when the pedal arm swings forward, the fixed bracket synchronizes with the pedal arm Swing, the connecting rod moves forward as a whole, and at the same time, the pin shaft slides up along the arc-shaped groove, so that the end of the connecting rod and the swing arm is lifted upwards; in addition, the fixed bracket also supports the connecting rod and strengthens the structural strength to prevent the connecting rod from breaking.

In the above-mentioned brake pedal, the fixing bracket includes an inverted U-shaped frame body, the frame body is fixed on the hinge shaft 1, and both outer ends of the frame body have clamping arms, and the two clamping arms It is arranged in a V shape, and the outer ends of the clamping arms are provided with mounting plates, and the two mounting plates are both connected to the hinge shaft 5 . Through the arrangement of the structure, the structural strength of the connecting rod is further improved, so that the connecting rod is less likely to be broken, and the movement of the connecting rod is guaranteed to be stable.

In the above-mentioned brake pedal, two opposite sides of the frame body are provided with mounting holes with notches, and both ends of the first hinge shaft are embedded in the corresponding mounting holes. With the arrangement of this structure, the fixing bracket is conveniently installed on the first hinge shaft.

In the above-mentioned brake pedal, the connecting rod includes a rod portion, two ends of the rod portion are provided with connecting blocks, both of the two connecting blocks are provided with a vacant slot, and the swing arm is at least partially located in one of the two connecting blocks. In the give-away slot, the drive member is fixed at one end of the connecting rod and the drive member is arranged through the give-away groove; the pedal arm is at least partially located in another give-away groove, and the hinge shaft passes through the pedal arm and The give way slot setting. Through the arrangement of the structure, the connection between the connecting rod, the pedal arm and the swing arm is stable, and the connecting rod has better structural strength, so that the connecting rod can bear the force better.

Compared with the prior art, the brake pedal of the present invention has the following advantages: in the whole braking process, the turning radius Ra of the pedal arm, the linear distance Rb between the first hinge shaft and the driving part, the second hinge shaft and the hinge shaft The straight-line distance Rc between the three remains unchanged. Since the driving member slides up along the arc-shaped groove, and the position of the second hinge shaft remains unchanged, the linear distance Rd between the second hinge shaft and the driving member gradually increases. Then, the lever ratio of the brake pedal is gradually increased, and the variation range of the linear distance Rd between the second hinge shaft and the driving member in this structure is much larger than the variation of the distance Rb between the first rotating shaft and the second pin shaft in the prior art range, and the brake pedal lever ratio of this structure is a proportional function related to Rd. When the straight line distance Rd between the second hinge shaft and the driving part is larger, the brake pedal lever ratio is larger, thereby significantly improving the pedal lever. The change range of the ratio can significantly improve the pedal feel state change during the braking process of the whole vehicle, improve the performance of the vehicle braking system, reduce the braking distance and optimize the brake pedal feel.

Description of drawings

FIG. 1 is a schematic view of the three-dimensional structure of the present invention.

Figure 2 is a right side view of the present invention with the pedal bracket removed.

FIG. 3 is a schematic three-dimensional structure diagram of the present invention with the pedal bracket removed.

FIG. 4 is a schematic view of the structure of the present invention with the pedal bracket removed.

FIG. 5 is a schematic three-dimensional structure diagram of the fixing bracket of the present invention.

In the figure, 1, pedal bracket; 2, pedal arm; 3, connecting rod; 30, rod; 31, connecting block; 31a, giving way slot; 4, swing arm; 40, arc groove; 5, booster Push rod; 6, hinge shaft one; 7, hinge shaft two; 8, fixed bracket; 80, frame body; 81, clamp arm; 82, mounting plate; 83, mounting hole; 83a, notch; 9, pin shaft; 10 , hinge shaft three; 11, plastic parts; 11a, arc-shaped slideway; 11b, oil storage tank; 12, hinge shaft four; 13, hinge shaft five.

Detailed ways

The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

Example 1

As shown in Figures 1, 2 and 3, the brake pedal includes a pedal bracket 1, a pedal arm 2, a connecting rod 3, a swing arm 4 and a booster push rod 5. The pedal arm 2 is connected to the pedal through a hinge shaft 1 6 The bracket 1 is hingedly connected, the lower end of the swing arm 4 is hingedly connected to the pedal bracket 1 through the second hinge shaft 7, one end of the booster push rod 5 is hingedly connected to the upper end of the swing arm 4 through the third hinge shaft 10, and the swing arm 4 is provided with a circular arc The arc-shaped groove 40 is arranged along the length direction of the swing arm 4, the convex side of the arc-shaped groove 40 faces the connecting rod 3, the connecting rod 3 is inclined downward, and the connecting rod 3 is connected with the swing arm 4 One end of the connecting rod 3 faces downward; one end of the connecting rod 3 is connected with a driving member. In this embodiment, the driving member is a pin shaft 9, and the pin shaft 9 passes through the arc-shaped groove 40. The brake pedal also includes a hinge shaft four 12, a hinge The shaft five 15 and the fixed bracket 8, the other end of the connecting rod 3 is connected with the pedal arm 2 through the hinge shaft four 12, the upper end of the fixed bracket 8 is fixed on the hinge shaft one 6 or the pedal arm 2, and the middle of the connecting rod 3 passes through the hinge shaft. The fifth 15 is connected with the lower end of the fixing bracket 8 .

在整个制动过程中，踏板臂2的转动半径Ra、铰接轴一6与销轴9之间的直线距离Rb、铰接轴二7与铰接轴三10之间的直线距离Rc均不变，由于销轴9沿着圆弧形槽40向上滑动，而铰接轴二7位置始终保持不变，使得铰接轴二7与销轴9之间的直线距离Rd逐渐变大，进而使得制动踏板杠杆比逐渐变大，本结构中的铰接轴二7与销轴9之间的直线距离Rd变化范围远大于现有技术中第一转轴与第二销轴之间的距离Rb的变化范围，并且本结构的制动踏板杠杆比是与Rd相关的正比例函数，当铰接轴二7与销轴9之间的直线距离Rd越大时，制动踏板杠杆比越大，进而显著提高了踏板杠杆比的变化范围，明显改善整车制动过程中的踏板感状态变化，提高车辆制动系统性能、降低制动距离和优化制动踏板感。The pedal arm 2, the fixing bracket 8 and the connecting rod 3 are in a triangular structure, and the triangle has stability, so that the connecting rod 3 will not rotate around the hinge shaft 4 12, and the driver steps on the pedal, so that the pedal arm 2 swings forward and is fixed. The bracket 8 and the connecting rod 3 move synchronously with the pedal arm 2, the connecting rod 3 moves forward as a whole, and at the same time the pin shaft 9 slides up along the arc-shaped groove 40, so that the end of the connecting rod 3 connected with the swing arm 4 is lifted upwards , and then push the swing arm 4 to swing forward, and drive the booster push rod 5 to move forward. As shown in Figure 4, the turning radius of the pedal arm 2 is Ra, the straight line distance between the hinge shaft 1 6 and the pin shaft 9 is Rb, the straight line distance between the hinge shaft 2 7 and the hinge shaft 3 10 is Rc, the hinge shaft The straight-line distance between the two 7 and the pin 9 is Rd, and the lever ratio of the brake pedal is

During the whole braking process, the turning radius Ra of the pedal arm 2, the straight-line distance Rb between the hinge shaft 1 6 and the pin shaft 9, and the straight-line distance Rc between the hinge shaft 2 7 and the hinge shaft 3 10 remain unchanged. The pin shaft 9 slides upward along the arc-shaped groove 40, and the position of the second hinge shaft 7 remains unchanged, so that the linear distance Rd between the second hinge shaft 7 and the pin shaft 9 gradually increases, thereby making the brake pedal lever ratio Gradually increasing, the variation range of the linear distance Rd between the second hinge shaft 7 and the pin shaft 9 in this structure is much larger than the variation range of the distance Rb between the first rotating shaft and the second pin shaft in the prior art, and this structure The brake pedal lever ratio is a proportional function related to Rd. When the linear distance Rd between the hinge shaft 2 7 and the pin shaft 9 is larger, the brake pedal lever ratio is larger, and the change of the pedal lever ratio is significantly improved. It can significantly improve the pedal feel state change during the braking process of the whole vehicle, improve the performance of the vehicle braking system, reduce the braking distance and optimize the brake pedal feel.

In addition, in the initial stage of the pedal arm 2 swinging forward, the connecting rod 3 is inclined downward, and the pedal lever is relatively small, which can effectively reduce the pedal stroke and realize rapid braking; in the middle section of the pedal arm 2 swinging forward , at this time, the connecting rod 3 is in a horizontal state, and the pedal lever becomes larger. At this time, the minimum pedal force can be applied to obtain a greater braking effect; in the rear section of the pedal arm 2 swinging forward, the connecting rod 3 is in the Incline up the setting, the pedal force required for braking gradually increases, so that the pedal feel is significantly improved.

As shown in FIGS. 3 and 5 , the fixing bracket 8 includes an inverted U-shaped frame body 80 . The frame body 80 is fixed on the hinge shaft 1 6 . Both outer ends of the frame body 80 have clamping arms 81 . The two clamping arms 81 It is arranged in a V shape, the outer ends of the clamp arms 81 are provided with mounting plates 82, and the two mounting plates 82 are connected to the hinge shaft five 15; the opposite sides of the frame body 80 are provided with mounting holes 83 with a gap 83a, and the hinge shaft is provided with mounting holes 83. Both ends of a 6 are embedded in the corresponding mounting holes 83 .

As shown in FIG. 1 , FIG. 2 and FIG. 3 , the connecting rod 3 includes a rod portion 30 , and both ends of the rod portion 30 are provided with connecting blocks 31 . The two connecting blocks 31 are both provided with an abdication slot 31 a , and the swing arm 4 is at least partially Located in one of the let-away grooves 31a, the pin shaft 9 is fixed at one end of the connecting rod 3 and the pin shaft 9 is arranged through the let-away groove 31a; the pedal arm 2 is at least partially located in the other let-away groove 31a, and the hinge shaft three 10 It is provided through the pedal arm 2 and the escape groove 31a.

As shown in FIG. 2 and FIG. 3 , the brake pedal also includes an arc-shaped plastic part 11 embedded in the arc-shaped groove 40 , and an arc-shaped slideway 11 a is opened on the plastic part 11 , and the pin shaft 9 It is arranged through the arc-shaped slideway 11a. During the braking process, the pin shaft 9 slides along the arc-shaped slideway 11a to avoid the direct contact between the pin shaft 9 and the hole wall of the arc-shaped groove 40, resulting in the pin shaft 9 and the The hole wall of the arc-shaped groove 40 is very easy to wear. When the inner wall of the arc-shaped slideway 11a is worn, the plastic part 11 is taken out from the arc-shaped groove 40 and replaced with a new plastic part 11; An oil storage tank 11b is opened on the inner wall of the channel 11a and the pin shaft 9 which abuts against. The oil storage tank 11b is arranged along the arc direction of the arc-shaped slideway 11a. After the brake pedal is assembled, the oil storage tank 11b is filled with lubricating oil. The sliding of the pin shaft 9 in the arc-shaped slideway 11a is provided with lubrication, so that the sliding of the pin shaft 9 is smoother, and the wear of the pin shaft 9 and the plastic parts 11 is also reduced.

Example 2

The content of this embodiment is basically the same as that of the above-mentioned Embodiment 1, the difference is that: the driving member in this embodiment includes a rotating shaft arranged on the connecting rod 3 and a roller sleeved on the rotating shaft, and the roller is located in the arc-shaped groove 40, And the roller rolls along the groove wall of the arc groove 40 .

Example 3

The content of this embodiment is basically the same as that of the above-mentioned Embodiment 1. The difference is that the fixed bracket 8 is eliminated in this embodiment, and one end of the connecting rod 3 is fixed to the pedal arm 2 by welding or other fixed connection methods.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention pertains can make various modifications or additions to the described specific embodiments or substitute in similar manners, but will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Claims (9)

1. A brake pedal comprises a pedal support (1), a pedal arm (2), a connecting rod (3), a swing arm (4) and a booster push rod (5), wherein the pedal arm (2) is hinged with the pedal support (1) through a first hinged shaft (6), the lower end of the swing arm (4) is hinged with the pedal support (1) through a second hinged shaft (7), one end of the booster push rod (5) is hinged with the upper end of the swing arm (4) through a third hinged shaft (10), the brake pedal is characterized in that the swing arm (4) is provided with an arc-shaped groove (40), one end of the connecting rod (3) is provided with a driving piece which is arranged in the arc-shaped groove (40) in a sliding manner and can push the swing arm (4) to swing, the other end of the connecting rod (3) is fixed on the pedal arm (2), the brake pedal further comprises a fourth hinged shaft (12), a fifth hinged shaft (15) and a fixed support (8), one end of the connecting rod (3) is connected with the pedal arm (2) through a fourth hinged shaft (12), the upper end of the fixed support (8) is fixed on the first hinged shaft (6) or the pedal arm (2), and the middle of the connecting rod (3) is connected with the lower end of the fixed support (8) through a fifth hinged shaft (15).

2. A brake pedal according to claim 1, characterized in that the circular arc groove (40) is provided along the length of the swing arm (4) and the outer convex side of the circular arc groove (40) is directed towards the connecting rod (3).

3. A brake pedal according to claim 2, characterized in that the connecting rod (3) is arranged obliquely downwards, and the end of the connecting rod (3) connected with the swing arm (4) is directed downwards.

4. A brake pedal according to claim 1, wherein the driving member is a pin (9), the pin (9) being inserted in the circular groove (40).

5. The brake pedal according to claim 4, further comprising a circular arc-shaped plastic member (11) embedded in the circular arc-shaped groove (40), wherein the plastic member (11) is provided with a circular arc-shaped slideway (11a), and the pin shaft (9) is inserted into the circular arc-shaped slideway (11 a).

6. The brake pedal according to claim 5, wherein an oil storage groove (11b) is formed in the inner wall, which is attached to the pin shaft (9), of the arc-shaped slideway (11a), and the oil storage groove (11b) is arranged along the arc direction of the arc-shaped slideway (11 a).

7. A brake pedal according to claim 1, wherein the fixing bracket (8) comprises a bracket body (80) in an inverted U shape, the bracket body (80) is fixed on the first hinge shaft (6), the two outer ends of the bracket body (80) are provided with clamping arms (81), the two clamping arms (81) are arranged in a V shape, the outer ends of the clamping arms (81) are provided with mounting plates (82), and the two mounting plates (82) are connected on the fifth hinge shaft (15).

8. The brake pedal according to claim 7, wherein the frame body (80) is provided with mounting holes (83) having notches (83a) at opposite sides thereof, and both ends of the first hinge shaft (6) are embedded in the corresponding mounting holes (83).

9. The brake pedal according to claim 1, wherein the connecting rod (3) comprises a rod portion (30), connecting blocks (31) are arranged at two ends of the rod portion (30), each of the two connecting blocks (31) is provided with a relief groove (31a), the swing arm (4) is at least partially positioned in one of the relief grooves (31a), the driving member is fixed at one end of the connecting rod (3) and is arranged to penetrate through the relief groove (31 a); the pedal arm (2) is at least partially positioned in another abdicating groove (31a), and the articulated shaft four (12) penetrates through the pedal arm (2) and the abdicating groove (31 a).

Images