CN106938687B - Motorcycle rear brake transmission mechanism - Google Patents

Abstract

The invention discloses a rear brake transmission mechanism of a motorcycle.A brake pedal lever is arranged on a frame through a main bracket shaft; the brake main pump is fixedly installed on the frame through a brake main pump support. A connecting plate D is fixedly arranged on the brake pedal lever, the upper end of the connecting plate D is rotatably connected with one end of the brake rocker arm through a pin E, a strip-shaped hole is arranged at the end of the brake rocker arm, and the other end of the brake rocker arm is connected with the other end of the brake rocker arm through a pin E ^/ The upper end of the connecting rod is connected with a brake main pump push rod; pin E ^/ The center is vertically intersected with the axis of the braking main pump; the middle part of the brake rocker arm is connected with the vehicle frame through a pin shaft I to form a rotation center of the brake rocker arm. Main support shaft, pin shaft E and pin shaft E ^/ The pin shafts I are parallel to each other. The invention can realize linkage of front and rear braking of the motorcycle, has compact structure, can adapt to the space requirement of the prior motorcycle, and has accurate and reliable braking force transmission.

Description

Motorcycle rear brake transmission mechanism

technical field

The invention relates to the improvement of a motorcycle brake structure, in particular to a motorcycle rear brake transmission mechanism, which belongs to the technical field of motorcycle brakes.

Background technique

Usually the front and rear brakes of motorcycles are designed separately and independently, the front brake is a hand brake, and the rear brake is a foot brake. The normal brake should be based on the foot brake. If the front brake is used alone, the vehicle will easily roll over. When emergency braking is required, the hand brake and the foot brake act simultaneously. But such a braking mode puts forward higher requirements on the driver. In order to reduce driving requirements and improve driving safety, a feasible way is to brake the front and rear wheels, and because there are other parts that need to be operated, the usual practice is to jointly control the front and rear wheel brakes with the foot brake and release the hand brake. . Taking the original rear drum brake as an example, to change it to a disc brake [CBS (Combined-Brake System), which is part of the front and rear wheel linkage braking system], it is necessary to apply the driver's foot to the direction of the brake pedal. The power of stepping down is converted into the upward thrust of the brake main pump push rod.

However, in actual motorcycle design, since the rear of the engine, muffler, muffler mounting plate, cover, etc. correspond to the surroundings of the transmission mechanism, the layout space left for the designer is very limited. Specifically, the space for the up and down movement of the brake pedal connecting rod and the brake main pump push rod is just in the gap between the rear of the engine and the rear fork shaft, and can only move up and down, so the layout space of the linkage mechanism is very limited. The brake rocker arm can only be located at the lower part of the engine, and the right side (relative to the whole vehicle) has a muffler and a muffler mounting plate, and the outside of the right side of the brake main pump is covered by a cover, the brake pedal connecting rod and the brake main pump push rod Care must be taken that no interference with the edge of the cover occurs during the up and down movement. Therefore, the entire connecting rod transmission mechanism needs to be designed quite compactly, and there are many issues to be considered in the design process, such as checking the motion track, checking the limit position, whether the length of the arm and the ratio of the arm meet the thrust requirements of the brake main pump and whether the human force is applied. It depends on the strength requirements of the brake pedal, whether the distance between the whole mechanism and the surrounding parts during the whole movement process meets the design requirements of the motorcycle, etc.

Contents of the invention

In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a motorcycle rear brake transmission mechanism. The motorcycle rear brake transmission mechanism can realize the linkage of the front and rear brakes of the motorcycle. The space requirements of motorcycles are limited, and the braking force transmission is accurate and reliable.

In order to achieve the above object, the technical scheme adopted in the present invention is as follows:

The motorcycle rear brake transmission mechanism includes a brake pedal and a brake main pump. One end of the brake pedal is provided with a pedal, and the other end is rotatably installed on the frame through the main bracket shaft; The main pump bracket is fixedly installed on the vehicle frame, and the brake main pump has two outputs, which are respectively connected to the brake actuators of the front and rear wheels; It faces upward and is rotatably connected to one end of the brake rocker arm through the pin shaft E fixed on the connecting plate D. One end of the brake rocker arm is provided with a bar-shaped hole, and the pin shaft E is located in the bar-shaped hole. The other end of the brake rocker arm passes through the pin Axis E ^/ is rotatably connected to the lower end of the connecting rod, and the upper end of the connecting rod is connected to the push rod of the brake main pump; the pin axis E ^/ central axis intersects and is perpendicular to the axis of the brake main pump; The frame can be rotatably connected to form the rotation center of the brake rocker arm; there is a spring hanging plate on the brake pedal, the lower end of the return spring is hung on the spring hanging plate, and the upper end is hung on the frame; the lower end of the rear brake switch spring is hung On the spring hanging plate, the upper end is hung on the rear brake switch, and the rear brake switch is fixed with the vehicle frame by the rear brake switch bracket; the main support shaft, the bearing pin E, the bearing pin E ^/ , and the bearing pin I are parallel to each other.

The upper end of the connecting plate D is tilted outward, and the brake rocker arm is arranged along the front and rear direction of the vehicle body so that the brake rocker arm and the brake pedal are located in different planes in space, and the rear end of the brake rocker arm is bent toward the outside of the vehicle body and then The length direction of the vehicle body is bent in parallel, and the rotation plane of the brake rocker arm and the brake pedal is located in the width direction of the vehicle body, wherein the brake rocker arm is located on the outside of the vehicle body, and the brake pedal is located on the inside of the vehicle body. In the present invention, the brake rocker arm and the brake pedal rod are staggered and not on the same plane, which not only avoids the interference between the parts, but also realizes the precise force transmission from the brake pedal to the brake main pump.

A connecting rod limiting bracket is fixed on the vehicle frame, the connecting rod limiting bracket is U-shaped, the U-shaped opening faces the vehicle frame and is welded on the vehicle frame through two ends, and the connecting rod passes through the middle cavity of the connecting rod limiting bracket R However, the upper end of the return spring is hung on the hanging hole on the connecting rod limit bracket. The specific structure of the connecting rod limit bracket R can not only hang the return spring, but also act as a protective plate and a left and right limit device for the connecting rod, so that the connecting rod can move more reliably.

The pin shaft I is fixed to the connecting plate J, the connecting plate J is fixed to the limit rod, and the limit rod is parallel to the axis of the main bracket and fixed on the vehicle frame; the limit rod is located above the brake pedal and between the pin shaft I and Between the pin axis E ^/ , it is used to limit the maximum angle of the brake pedal swinging up through the contact with the brake pedal; the return spring and the rear brake switch spring pass through the limit rod.

The connecting end of the pin shaft I and the connecting plate J has a thin section for easy connection to form a stepped shaft, the connecting plate J is provided with a connecting hole corresponding to the thin section of the pin shaft I, and the thin section of the pin shaft I is inserted into the corresponding connecting hole and Welding connection; the connecting end of the limit rod and the connection plate J has a thin section for easy connection to form a stepped shaft, the connection plate J is provided with a connecting hole corresponding to the thin section of the limit rod, and the thin section of the limit rod is inserted into the corresponding connection holes and solder connections.

The connecting rod has an arc-shaped structure, and the arc-shaped structure of the connecting rod meets the following conditions: when the brake rocker arm rotates around the pin axis I and pushes the connecting rod to move, the movement track of the upper end of the connecting rod is a straight line, which coincides with the axis of the main brake pump .

A ring sleeve is welded on the bracket of the main brake pump. The ring sleeve covers the push rod of the main brake pump to restrict the movement of the push rod of the main brake pump. The upper and lower edges of the ring sleeve are turned outward to form a smooth structure, so that the push rod The rod can flexibly move up and down in a straight line without being caught.

The upper end of the connecting rod is connected with the push rod of the main brake pump through the connecting plate of the main brake pump; The moving main pump connecting plate is rotatably connected, and the lower end of the brake main pump push rod passes through the connecting hole on the upper end of the braking main pump connecting plate and is locked by a nut.

The rear brake transmission mechanism of the present invention realizes the precise force transmission from the rear brake pedal to the brake main pump in the form of "three-dimensional traffic" under the constraints of limited space layout position and strict leverage ratio conditions, and ensures that all The installation firmness of parts, the realization of various additional functions and the reliability of braking. In the case that the force cannot be directly transmitted to the brake main pump push rod through the brake pedal or the rotating shaft, the force transmission through the connecting plate D on the brake pedal→brake rocker→connecting rod→brake main pump push rod The path realizes the transmission of the pedal force, and the function of the mechanism is reliable and the force transmission is accurate.

Almost all parts in this application embody the design features of "three-dimensional transportation". Specifically, the design of "three-dimensional transportation" is roughly divided into four layers: the rotation of the brake pedal around the axis of the main bracket and the welding between the brake pedal The spring hanging plate on the top pulls the return spring and the movement of the rear brake switch spring constitutes the lowest layer of traffic (the layer closest to the center plane of the vehicle); the connecting plate D welded on the brake pedal pulls the brake rocker arm around The rotation of pin shaft 1 constitutes the second layer of traffic; the left end of the brake rocker drives the connecting rod and the brake main pump connecting plate, the up and down movement of the brake main pump push rod constitutes the third layer of traffic; the connecting rod limit bracket and Other components in the M8 nut installed on it constitute the uppermost assembly relationship.

Among them, the first layer and the second layer are staggered from each other through the upper end of the connecting plate D to the right (outer side), and the traffic on the third layer is staggered from the second layer through the rightward bending shape (outer side) of the left end of the brake rocker arm. and a certain distance from the main support axis of the first layer, so that the relative movement between the first layer and the third layer will not interfere. The distance between the uppermost layer and the third layer is relatively short. Considering that the upper limit position of the pin axis E ^/ may interfere with the limit bracket of the connecting rod, a gap is opened at the lower edge of the limit bracket of the connecting rod, and the arc on the connecting rod It is also to let go of the bolt head protruding from the M8 nut on the connecting rod limit bracket.

The design of the transmission mechanism of the present invention is quite compact, which satisfies the checking of the motion trajectory, the checking of the limit position, the length of the force arm and the ratio of the force arm to meet the thrust requirements of the brake main pump and the force requirements applied by people to the brake pedal. The distance between the process and the surrounding parts meets the motorcycle design requirements and so on.

Description of drawings

Figure 1 - Schematic diagram of the three-dimensional structure of the present invention.

Fig. 2 - the orthographic projection structure diagram of the present invention.

Figure 3—right view of Figure 2.

Fig. 4 - the position relationship diagram of the pin shaft I, the brake rocker arm, the connecting plate J and the limit rod of the present invention.

Figure 5 - Schematic diagram of the structure of the connecting plate D of the present invention.

Figure 6 - Schematic diagram of the structure of the brake rocker arm of the present invention.

Figure 7-6 top view.

Fig. 8 - Schematic diagram of the ring sleeve structure of the present invention.

Fig. 9 - Schematic diagram of the bracket structure of the main brake pump of the present invention.

Fig. 10 - the position relationship diagram of the present invention on the whole vehicle and the surrounding components (without cover).

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

Referring to Fig. 1, Fig. 2 and Fig. 3, as can be seen from the figure, the rear brake transmission mechanism of the motorcycle of the present invention comprises a brake pedal 1 and a main brake pump 2, and one end of the brake pedal 1 is provided with a pedal 3 , and the other end is rotatably installed on the vehicle frame 5 through the main support shaft 4 . The main brake pump 2 is fixedly installed on the vehicle frame 5 through the main brake pump bracket 6. Specifically, the body of the main brake pump 2 is installed on the main brake pump bracket 6 through two M6 bolts. The bracket 6 is also fixedly connected with the vehicle frame 5 through two M6 bolts, wherein the upper installation point is the inherent installation point of the vehicle body parts, and the lower connection point is installed on the vehicle body through the connecting plate welded on the frame pipe fittings. on the shelf. The main brake pump 2 has two outputs, which are respectively connected to the brake actuators of the front and rear wheels.

In order to realize the transmission and structural arrangement of the braking force in a limited space, the present invention fixes a connecting plate D7 on the brake pedal 1. One end of the arm 9 is rotatably connected, and one end of the brake rocker 9 is provided with a bar-shaped hole 10, the pin shaft E8 is located in the bar-shaped hole 10, and the other end of the brake rocker 9 is rotatably connected with the lower end of the connecting rod 12 through the pin shaft E ^/ 11 , the upper end of the connecting rod 12 is connected with the brake main pump push rod 13; the central axis of the pin shaft E ^/ 11 intersects and is perpendicular to the axis of the brake main pump 2; the middle position of the brake rocker arm 9 is connected with the vehicle frame 5 through the pin shaft I14 to form The rotation center of the brake rocker arm; the brake pedal 1 is provided with a spring hanging plate 15, the lower end of the return spring 16 is hung on the spring hanging plate 15, and the upper end is hung on the vehicle frame; the lower end of the rear brake switch spring 17 is hung on the On the spring hanging plate 15, the upper end is hung on the rear brake switch 18, and the rear brake switch 18 is fixed with the vehicle frame 5 by the rear brake switch bracket 19; the main support shaft 4, pin E8, pin E ^/ 11, pin The axes I14 are parallel to each other.

The upper end of the connecting plate D7 is tilted outward, and the brake rocker arm 9 is arranged along the front and rear direction of the vehicle body so that the brake rocker arm 9 and the brake pedal rod 1 are located in different planes in space, and the rotation plane of the brake rocker arm and the brake pedal rod Located in the width direction of the vehicle body, the brake rocker arm is located on the outside of the vehicle body, and the brake pedal is located on the inside of the vehicle body. In the present invention, the brake rocker arm and the brake pedal rod are staggered and not on the same plane, which not only avoids the interference between the parts, but also realizes the precise force transmission from the brake pedal to the brake main pump.

On the vehicle frame 5, a connecting rod limiting bracket 20 is fixed, and the connecting rod limiting bracket 20 is U-shaped. The U-shaped opening faces the vehicle frame and is welded on the vehicle frame 5 by two ends. 20 through the middle cavity, and the upper end of the return spring 16 is hung on the hanging hole on the connecting rod limit bracket 20 . The connecting rod limit bracket 20 of the present invention has a specific structure, and has three functions: 1) Weld the M8 nut at the original hole position R1, so that the installation position and installation strength of the original parts remain unchanged; the M8 nut is used to install the small foot rest state of the vehicle The original design of this model has a hole for installing the footrest and M8 welding nuts here. After the drum brake is changed to a disc brake with front and rear linkage, the installation hole is required to be reserved, so the connecting rod The limit bracket 20 needs to be redesigned; 2) act as a spring hanging plate, so that there is a connection at the upper end of the return spring of the rear brake pedal; 3) act as a protective plate and a left and right limit device for the connecting rod 12, so that the connecting rod 12 can Accurate up and down movements. The connecting rod limit bracket 20 is welded on the vehicle frame through two contact points with the vehicle frame. The lower end of the return spring 16 is hung on the lower hole of the spring hanging plate 15, and the upper end is hung on the hole of the connecting rod limit bracket 20. The lower end of the rear brake switch spring 17 is hung at the upper hole of the spring hanging plate 15, the upper end is hung at the spring hanging point of the lower end of the rear brake switch 18, and the rear brake switch 18 is installed on the rear brake switch bracket 19 through a nut , the rear brake switch bracket 19 is then welded on the vehicle frame 5 pipe fittings.

The pin shaft I14 is fixed to the connecting plate J21, and the connecting plate J21 is fixed to the limit rod 22. The limit rod 22 is parallel to the main support shaft 4 and fixed on the vehicle frame; the limit rod 22 is located above the brake pedal 1 and Located between the pin shaft I14 and the pin shaft E ^/ 11, it is used to limit the maximum angle of the brake pedal swing upwards through contact with the brake pedal 1; the return spring 16 and the rear brake switch spring 17 start from the limit Rod 22 passes over it. See Figure 4 for the specific structure.

In order to connect more reliably, the pin shaft I14 of the present invention is welded together with the connecting plate J21 in a stepped positioning manner, and the connecting plate J21 and the limit rod 22 on the vehicle frame are also welded together in a stepped positioning manner. Specifically, the connecting end of the pin shaft I and the connecting plate J has a thin section for easy connection to form a stepped shaft, the connecting plate J is provided with a connecting hole corresponding to the thin section of the pin shaft I, and the thin section of the pin shaft I is inserted into the corresponding connecting hole. holes and solder connections. The connecting end of the limiting rod and the connecting plate J has a thin section for easy connection to form a stepped shaft, the connecting plate J is provided with a connecting hole corresponding to the thin section of the limiting rod, and the thin section of the limiting rod is inserted into the corresponding connecting hole and Solder connection. The symbol T in Fig. 4 represents the connection position of two steps.

The connecting rod 12 is an arc-shaped structure, and the arc-shaped structure of the connecting rod 12 meets the following conditions: when the brake rocker arm rotates around the pin axis I and pushes the connecting rod to move, the motion track of the upper end of the connecting rod is a straight line, which is in line with the brake main pump. The axes coincide. At the same time, the arc shape of the connecting rod can also avoid the requirement of the bolt head protruding from the M8 nut (generally, at least 5~10mm of the mounting nut should be exposed after the bolt is tightened).

A ring sleeve 23 is welded on the brake main pump bracket 6, and the ring sleeve 23 covers the brake main pump push rod 13 to restrict the movement of the brake main pump push rod. The upper and lower edges of the ring sleeve 23 are turned outward to form a smooth Structure, so that the push rod can flexibly move up and down in a straight line without being caught.

The upper end of the connecting rod 12 is connected with the main brake pump push rod 13 through the connecting plate 24 of the main brake pump; The bearing pin is rotatably connected with the main brake pump connecting plate 24, and the lower end of the main brake pump push rod 13 passes through the connecting hole at the upper end of the main brake pump connecting plate 24 and is locked by a nut.

The brake pedal 1 of the present invention adopts a traditional installation method, that is, it passes through the main bracket shaft 4 and is installed on the vehicle frame with a washer and a cotter pin, and can rotate around the main bracket shaft 4, while the brake pedal 1 welded on Connecting plate D7 and spring hanging plate 5 are additional. The brake pedal 1 makes the brake rocker arm 9 rotate around the axis of the pin shaft I14 through the connecting plate D7 and the pin shaft E8 fixedly connected to the connecting plate D7. The outer end of the pin shaft E8 is provided with a cotter pin and a gasket, wherein the function of the cotter pin is to prevent the brake rocker arm 9 from falling off from the pin shaft E8, and the function of the gasket is to prevent friction and control between the cotter pin and the brake rocker arm 9. Axial play. The left end of the brake rocker shown in the figure is connected with the lower end of the connecting rod 12 through the same pin shaft E ^/ , washer and cotter pin, and the brake rocker arm 9 and the connecting rod 12 can rotate relatively around the pin shaft E ^/ 11. The upper end of the connecting rod 12 is connected together with the main brake pump connecting plate 24 with a pin, and the connecting rod 12 and the main brake pump connecting plate 24 can rotate relatively around the axis of the pin shaft, and the main brake pump connecting plate 24 It is fixedly connected with the master brake pump push rod 13 by a nut. During installation, the brake main pump push rod 13 needs to pass through the collar 23 welded on the brake main pump bracket 6 first, and then install the brake main pump push rod 13 and the brake main pump connecting plate 24 together with nuts .

Fig. 10 is a positional relationship diagram of the present invention on the whole vehicle and the surrounding parts (without cover).

Description of the mode of action of the present invention:

1. In the initial state, the pulling force of the return spring 16 makes the spring hanging plate 15 and the connecting rod limit bracket 20 close to each other. The brake pedal 1 rotates together in the counterclockwise direction of the front view until the upper surface of the brake pedal 1 contacts the lower surface of the limit rod 22 , then all components are in a state of static equilibrium.

2. When the driver depresses the brake pedal with his feet, the brake pedal 1 will overcome the pulling force of the return spring 16 and rotate clockwise in the front view, and at the same time, the spring hanging plate 15 will also pull the rear brake move the lower end of the switch spring 17, then the rear brake switch spring 17 will pull the lower end of the rear brake switch 18 and then trigger the rear brake switch 17, and the rear brake light is on.

3. When the driver depresses the brake pedal with his feet, the clockwise rotation of the brake pedal 1 also drives the connecting plate D7 to move downward. Since the pin shaft E8 is fixedly connected to the connecting plate D7, The rotation center of the pin shaft E8 is the same as that of the brake pedal 1 as the main support shaft 4, while the rotation center of the brake rocker arm 9 is the pin shaft I14, and the pin shaft E8 will drive the brake rocker arm during its downward movement. The right end of 9 moves downward, then the pin shaft E8 will produce a relative movement away from the pin shaft I14 during this process, so the hole position where the right end of the brake rocker arm 9 passes through the pin shaft E must be a bar hole (see Figure 6 ), and it must be designed so that when the pin shaft E8 moves to the right end of the bar hole, the brake main pump push rod 13 has moved upward to the limit position, that is, the situation that the brake main pump push rod 13 moves upward to the limit position must precede Bearing pin E8 moves to the rightmost situation of bar hole to take place, otherwise will produce the phenomenon of " brake not dead ".

When the brake rocker arm 9 is rotated clockwise by the pin shaft E8, the left end of the brake rocker arm 9 drives the connecting rod 12 to move upward, and the connecting rod 12 pushes the brake main pump connecting plate 24 and the brake main pump through the pin shaft. The push rod 13 moves upwards along the axis of the main brake pump 2. During this process, the lower end of the connecting rod 12 moves in a circular arc around the pin shaft I14 along with the brake rocker arm 9. The upper end of the connecting rod 12 and the main brake pump The pump connecting plate 24 and the main brake pump push rod 13 are restricted by the ring sleeve 23 and the brake main pump bracket 6 (see Fig. 9) and can only move linearly along the axis of the brake main pump 2. The ring sleeve 23 and the brake main pump The gap between the corresponding surface of the main pump bracket 6 and the push rod is designed to be 0.5-1mm, and the ring sleeve 23 is designed with an outward flanging (see Figure 8) to ensure that the brake main pump push rod 13 can flexibly move up and down in a straight line not get hung up.

4. When the driver does not need to brake the rear wheels, the downward pressure on the brake pedal disappears. At this time, the brake pedal and the pedal are under the combined action of the return spring and the return spring inside the main brake pump. Back to the initial state, the return resistance that this mechanism needs to overcome at this time is only the clockwise torque generated by the friction force and the gravity of the brake pedal and pedal (the torque generated by the gravity of other components can be ignored), so the return The spring must be designed for its tension (the spring tension of the rear brake switch is very weak, and its tension torque can be ignored), and the counterclockwise torque generated must be greater than the reverse torque generated by the gravity of the brake pedal and pedal rod, so as to ensure The brake pedal and pedal can return to the original state.

Lever ratio design and other positional relationships

When considering the positional relationship of each component, first of all, it is necessary to ensure that the pin axis E ^/ central axis at the left end of the brake rocker arm intersects with the axis of the main brake pump at 90°, so as to ensure the direction of the force applied to the push rod It coincides with the axis of the brake main cylinder to ensure that the piston in the brake main cylinder does not produce eccentric wear. However, the axis of the actual brake main pump push rod is allowed to have an included angle of less than 5° with the axis of the brake main pump, so the left end pin E of the brake rocker arm ^/ circular motion around the pin I is allowed, but To ensure that the upper and lower limit positions of the shaft center of the pin shaft E ^/ are on the front view, the midpoint of the line between the two projection points and the line of the projection point on the pin shaft I front view will be perpendicular to the axis of the brake main pump.

In the design of the leverage ratio, the design goal is that after the brake pedal is depressed by 25mm, the push rod of the brake main pump can move upwards by 13mm (the design maximum stroke of the push rod of the brake main pump). Assume that the force center of the brake pedal is d, the rotation center of the brake pedal is a (that is, the axis of the main bracket), the axis of the pin E is c, and the rotation center of the brake rocker is b (that is, the axis of the pin I). axis), the pin axis E ^/ center lower limit position is e, and the lever ratio ac:ad in the figure is i ₁ , and be:bc is i ₂ , then i ₁ ×i ₂ =13:25. Due to the relatively fixed position of the pin axis E ^/ and the limitation of the leverage ratio, the rotation center of the brake rocker arm (that is, the pin axis I) cannot be designed at the center of the limit rod, but must be moved forward for a certain distance.

When the left end of the brake rocker arm drives the connecting rod to move upward, the washer and the pin shaft that rise together with the left end of the brake rocker arm will interfere with the lower end of the connecting rod limit bracket when moving upward to the limit position, so the connecting rod There is also a gap on the lower side of the limit bracket corresponding to the upper limit position of the washer (see Figure 2), to ensure that the washer at the left end of the brake rocker arm will not interfere with other parts during the upward movement.

The characteristics of the present invention: the brake pedal transmission mechanism realizes the precise power transmission from the rear brake pedal to the brake main pump in the form of "three-dimensional traffic" under the constraints of limited space layout and strict leverage ratio conditions, And ensure the firmness of the installation of each part, the realization of each additional function and the reliability of braking. In the case that the force cannot be directly transmitted to the brake main pump push rod through the brake pedal or the rotating shaft, the force transmission through the connecting plate D on the brake pedal→brake rocker→connecting rod→brake main pump push rod The path realizes the transmission of the pedal force, and the function of the mechanism is reliable and the force transmission is accurate.

The structural characteristics and functions of some components will be further described below in conjunction with the accompanying drawings.

Connecting plate D, see Figure 5: the main function of this piece is to transmit the torque from the brake pedal and convert it into a downward pulling force on the right end of the brake rocker arm. The lower end of the connecting plate D is provided with an arc surface for fitting the brake pedal, the upper end is flat for fitting the brake rocker arm, and the upper end is provided with a round hole for assembling the pin shaft E; the upper end is bent against the inner side of the vehicle body to A step is formed between the upper and lower ends, and the step is designed to compensate for the height difference between the brake pedal and the brake rocker arm.

Pin shaft E/pin shaft E ^/ : This piece is used to withstand the shear force of two adjacent connecting plates. One end of the pin shaft has a stepped structure to ensure the assembly in place, and the other end has a round hole for passing through the cotter pin. The distance to the step surface must ensure accuracy, otherwise it will shake from side to side and affect the assembly effect.

Brake rocker arm, see Figure 6 and Figure 7: This part is the main force transmission component, and the bushing added in the middle is used to lengthen the contact area with the pin shaft I to ensure that it can only rotate relative to the pin shaft I without shaking left and right. The length and position of the hole on the right are very important, which has been emphatically described above. The left end of the brake rocker arm (the rear end of the motorcycle) is bent toward the outside of the vehicle body and then parallelly bent along the length of the vehicle body to form a step. The force gradually transitions to the right part of the vehicle. The goal is that when the force is transmitted to the lower end of the connecting rod, the direction of the force does not deviate from the axis of the main brake cylinder in the left and right positions.

Connecting rod: This part is mainly used to withstand and transmit the pressure between the brake rocker arm and the connecting plate of the main brake pump. Its thickness should not be too much less than the inner opening of the connecting plate of the main brake pump, so as not to cause left and right shaking. The bent shape of the middle part is to let go of the position of the welding nut on the limit bracket of the connecting rod during the movement, and at the same time make the movement track of the upper end of the connecting rod as far as possible on the axis of the main brake pump.

Ring sleeve, see Figure 8: This piece is mainly used to limit the swing of the main brake pump push rod from front to back, left and right, and only allows the brake main pump push rod to reciprocate up and down, and the clearance between the brake main pump push rod is 0.5-1mm. The main body is C-shaped, and the flange on the boundary ensures that the push rod can move up and down in a straight line flexibly without being caught by burrs or threads.

Brake main pump bracket, see Figure 9: This part is mainly used to install and fix the brake main pump. The middle part is raised to form a cavity below, so that the overall design is a bridge-like lap shape, and the cavity is for the lower part to pass through. The main cable, oil pipe, etc. give way to the space, and the two ends are fixed to the frame by bolts, and the installation hole at one end is designed as a strip hole to absorb the welding tolerance of the frame; two holes are provided at the raised position in the middle to install by bolts For the brake main pump, two nuts are welded on the back of the two holes, and the distance between the two holes should be equal to the installation hole distance of the brake main pump. The side of the lower end of the brake main pump bracket is turned over to form a ring sleeve fixing plate. The ring sleeve fixing plate is roughly vertical and perpendicular to the vehicle body. The ring sleeve fixing plate is used to limit the forward swing of the push rod and weld the ring sleeve . Most of the borders of the main body are reinforced with flanging, and the three curved parts are also reinforced with 45° ribs.

The above-mentioned embodiments of the present invention are only examples for illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, other variations and modifications in various forms can be made on the basis of the above description. All the implementation manners cannot be exhaustively listed here. All obvious changes or changes derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims (6)

1. Motorcycle rear brake transmission mechanism, including brake pedal and brake main pump, one end of the brake pedal is provided with a pedal, and the other end is rotatably installed on the frame through the main bracket shaft; the brake main pump passes through The bracket of the main brake pump is fixedly installed on the frame. The main brake pump has two outputs, respectively connected to the brake actuators of the front and rear wheels; The upper end of D faces upward and is rotatably connected to one end of the brake rocker arm through the pin shaft E fixed on the connecting plate D. One end of the brake rocker arm is provided with a bar-shaped hole, and the pin shaft E is located in the bar-shaped hole. The pin shaft E ^/ is rotatably connected to the lower end of the connecting rod, and the upper end of the connecting rod is connected to the push rod of the brake main pump; the pin shaft E ^/ central axis intersects and is perpendicular to the axis of the brake main pump; the middle position of the brake rocker arm passes through the pin shaft I It is connected with the frame to form the rotation center of the brake rocker arm; there is a spring hanging plate on the brake pedal, the lower end of the return spring is hung on the spring hanging plate, and the upper end is hung on the frame; the lower end of the rear brake switch spring is hung On the spring hanging plate, the upper end is hung on the rear brake switch, and the rear brake switch is fixed to the vehicle frame through the rear brake switch bracket; the main bracket axis, pin axis E, pin axis E ^/ , and pin axis I are parallel to each other; The upper end of the connecting plate D is tilted outward, and the brake rocker arm is arranged along the front and rear direction of the vehicle body so that the brake rocker arm and the brake pedal are located in different planes in space, and the rear end of the brake rocker arm is bent toward the outside of the vehicle body and then The length direction of the body is bent in parallel, and the rotation plane of the brake rocker arm and the brake pedal is located in the width direction of the body, wherein the brake rocker is located on the outside of the body, and the brake pedal is located on the inside of the body; A connecting rod limiting bracket is fixed on the frame, the connecting rod limiting bracket is U-shaped, the U-shaped opening faces the frame and is welded on the frame through both ends, and the connecting rod passes through the middle cavity of the connecting rod limiting bracket , the upper end of the return spring is hung on the hanging hole on the connecting rod limit bracket. 2. The motorcycle rear brake transmission mechanism according to claim 1, characterized in that: the pin shaft I is fixed to the connecting plate J, the connecting plate J is fixed to the limit rod, the limit rod is parallel to the axis of the main bracket and Fixed on the frame; the limit rod is located above the brake pedal and between the pin shaft I and the pin shaft E ^/ , and is used to limit the maximum angle of the brake pedal to swing upward through contact with the brake pedal; The return spring and the rear brake switch spring pass over the limit lever. 3. The motorcycle rear brake transmission mechanism according to claim 2, characterized in that: the connecting end of the pin shaft I and the connecting plate J has a thin section for easy connection to form a stepped shaft, and the connecting plate J is provided with a pin The connecting hole corresponding to the thin section of the shaft I, the thin section of the pin shaft I is inserted into the corresponding connecting hole and welded; There is a connection hole corresponding to the thin section of the limit rod, and the thin section of the limit rod is inserted into the corresponding connection hole and welded. 4. The motorcycle rear brake transmission mechanism according to claim 1, characterized in that: the connecting rod is an arc-shaped structure, and the arc-shaped structure of the connecting rod meets the following conditions: the brake rocker arm rotates around the pin axis I and pushes the connecting rod When moving, the motion trajectory of the upper end of the connecting rod is straight, and the straight line coincides with the axis of the brake main pump. 5. The motorcycle rear brake transmission mechanism according to claim 1, characterized in that: a ring sleeve is welded on the bracket of the main brake pump, and the ring sleeve covers the push rod of the main brake pump inside it to restrain the braking force. During the movement of the push rod of the main pump, the upper and lower edges of the ring are turned outward to form a smooth structure, so that the push rod can flexibly move up and down in a straight line without being caught. 6. The motorcycle rear brake transmission mechanism according to claim 1, characterized in that: the upper end of the connecting rod is connected with the main brake pump push rod through the main brake pump connecting plate; the main brake pump connecting plate has an opening Downward U-shaped, the upper end of the connecting rod is located in the U-shaped opening and is rotatably connected with the brake main pump connecting plate through the pin N, and the lower end of the brake main pump push rod passes through the connecting hole at the upper end of the brake main pump connecting plate Then lock it with a nut.

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