CN219237000U

CN219237000U - Brake assembly and all-terrain vehicle thereof

Info

Publication number: CN219237000U
Application number: CN202320845939.2U
Authority: CN
Inventors: 俞正明; 全金峰; 吴勇; 高雪良
Original assignee: Pinghu Xinyi Automotive Parts Manufacturing Co ltd
Current assignee: Pinghu Xinyi Automotive Parts Manufacturing Co ltd
Priority date: 2023-04-17
Filing date: 2023-04-17
Publication date: 2023-06-23
Anticipated expiration: 2033-04-17

Abstract

The utility model relates to a brake assembly and an all-terrain vehicle. The brake assembly and the all-terrain vehicle belong to the technical field of all-terrain vehicles; the brake assembly and the all-terrain vehicle thereof comprise pedal wheel brake plates, the lower surfaces of the pedal wheel brake plates are provided with spot brake structures, each spot brake structure comprises an upper pressure rod, a telescopic shell and a lower pressure rod, the upper ends of the upper pressure rods are fixedly connected with elastic connecting pads, and when the pedal wheel brake plates are stepped down, the spot brake structures can be intermittently telescopic, so that a one-step brake mode is automatically controlled, manual operation is replaced, the operation is simpler, and the requirements on drivers are lower.

Description

Brake assembly and all-terrain vehicle thereof

Technical Field

The utility model belongs to the technical field of all-terrain vehicles, and particularly relates to a brake assembly and an all-terrain vehicle.

Background

All-terrain vehicles are vehicles capable of running on any terrain, and can freely walk on terrain where ordinary vehicles are difficult to maneuver. Commonly known as beach vehicles in China. Because of its structure very similar to a motorcycle and many parts are common to a motorcycle, it is also known as a "four-wheel motorcycle". The vehicle model has multiple purposes and is not limited by road conditions.

However, the phenomenon that the all-terrain vehicle is easy to tip over when the all-terrain vehicle is suddenly braked on a bumpy road surface, and a driver drives the all-terrain vehicle in order to avoid the phenomenon of turning over, the all-terrain vehicle is usually braked in a spot braking mode, namely: the brake is slowly stepped on and the stepping is put down, but the psychological quality and experience of a driver need to be checked when the driver is operated on a bumpy road, and the requirement on the driver is high.

Therefore, a brake assembly and an all-terrain vehicle thereof are provided for solving the above drawbacks.

Disclosure of Invention

The utility model aims to solve the problems and provide the brake assembly and the all-terrain vehicle with simple structure and reasonable design.

The utility model realizes the above purpose through the following technical scheme:

the utility model provides a brake subassembly, includes pedal wheel brake board, pedal wheel brake board's lower surface is provided with some structure of stopping, some structure of stopping includes depression bar, flexible shell, lower depression bar, the upper end fixedly connected with elastic connection pad of going up the depression bar, the fixed bottom surface that sets up at pedal wheel brake board of elastic connection pad, the lower extreme activity of going up the depression bar stretches into the inside of flexible shell, the one end fixedly connected with top board that the activity of going up the depression bar stretches into flexible shell inside, the upper end activity of lower depression bar stretches into the inside of flexible shell, the fixed holding down plate that is provided with of one end activity of lower depression bar stretches into the flexible shell, the inside fixed welding of flexible shell has the baffle, the baffle is located between top board and the holding down plate, form first cavity between baffle and the holding down plate, the fixed welding of lower surface of holding down plate has first spring, the lower extreme fixed welding of first spring is on the bottom surface inner wall of flexible shell, one side of second cavity is provided with pressure mechanism, the opposite side of second cavity is provided with pressure release mechanism, one side of first cavity is provided with pressure release subassembly.

As a further optimization scheme of the utility model, the inflating mechanism comprises an inflator pump which is fixedly arranged on the outer surface of the telescopic shell and is communicated with the inside of the second chamber.

As a further optimization scheme of the utility model, the pressure release mechanism comprises a pressure release hole, a pressure release plate, a guide rod and a second spring, wherein the pressure release hole is formed in the telescopic shell and communicated between the outer part of the telescopic shell and the second cavity, the pressure release hole comprises a second round hole section and a first round hole section, the diameter of the second round hole section is larger than that of the first round hole section, the second round hole section is communicated with the outer part of the telescopic shell, the first round hole section is communicated with the second cavity, the pressure release plate is movably arranged in the second round hole section, the second spring is fixedly welded on the inner wall of one side of the second round hole section, which is close to the first round hole section, the guide rod is fixedly welded on the middle part of one side of the pressure release plate, which is close to the first round hole section, the guide rod movably penetrates through the middle part of the first round hole section, and an inclined plane is arranged at the corner of one side of the pressure release plate, which is close to the first round hole section.

As a further optimization scheme of the utility model, the switch assembly comprises a pressing column, an inflator switch, a communication hole, a telescopic groove, a third spring and a limiting plate, wherein the communication hole penetrates through the inner surface and the outer surface of the telescopic shell at the same time, one end of the communication hole penetrating through the inner surface of the telescopic shell is communicated with the inside of the first chamber, the inflator switch is arranged on the inflator, the inflator switch is clamped at one end of the communication hole, which is close to the outside of the telescopic shell, the pressing column is movably arranged in the communication hole, one end of the pressing column is movably attached to the surface of the inflator switch, the other end of the pressing column extends into the first chamber, one end of the pressing column, which extends into the first chamber, is hemispherical, the telescopic groove is arranged on the inner wall of the communication hole, the limiting plate is fixedly welded at the outer ring of the pressing column, which is close to one end of the inflator switch, one end of the third spring is fixedly welded at one side of the limiting plate, the other end of the third spring is fixedly welded on the inner wall of one side of the telescopic groove, which is far away from the first chamber, and one end of the pressing column extends into the first chamber, and corresponds to the lower part of the upper pressing plate.

The utility model also discloses an all-terrain vehicle, which comprises the brake assembly as described in any one of the above, and further comprises:

the all-terrain vehicle comprises an all-terrain vehicle body, wherein a pedal is arranged at the lower end of the all-terrain vehicle body, the lower end of the lower pressure rod is arranged on the pedal, and the pedal wheel brake plate is positioned above the pedal.

As a further optimization scheme of the utility model, a protection component for protecting the pedal wheel brake plate is arranged above the pedal, the protection component comprises a supporting seat, a protection plate and a support rod, the supporting seat is fixedly welded on the upper surface of the pedal, the upper end of the supporting seat is rotationally connected with one end of the protection plate through a rotating shaft, the support rod is fixedly welded on one surface of the protection plate, which is close to the pedal wheel brake plate, of the protection plate, the support rod corresponds to one end of the protection plate, which is far away from the rotating shaft, and the protection plate is positioned on one side of the pedal wheel brake plate.

As a further optimization scheme of the utility model, two handles are arranged on the all-terrain vehicle body, two front wheels and two rear wheels are also arranged on the all-terrain vehicle body, a first wheel brake and a second wheel brake are respectively arranged on the two handles, the first wheel brake is used for controlling the rear wheel brake, and the second wheel brake is used for controlling the front wheel brake.

The utility model has the beneficial effects that: when the pedal wheel brake plate is stepped, the point brake structure can stretch intermittently, so that a one-step one-place brake mode is automatically controlled, manual operation is replaced, the operation on a bumpy road surface is simpler, and the requirement on a driver is lower.

When the driver steps on the pedal wheel brake plate, the pedal wheel brake plate compresses the elastic connection pad and then continuously drives the upper pressing rod to press down, so that the upper pressing rod contacts the switch assembly, the switch assembly controls the opening of the pressurizing mechanism, the second chamber is continuously inflated after the opening of the pressurizing mechanism, higher air pressure is generated in the second chamber, the air pressure pushing action drives the lower pressing plate to descend, the lower pressing rod descends when the lower pressing plate descends, and the operation of stepping on the brake is realized.

Along with the continuous rising of atmospheric pressure in the second cavity, after the atmospheric pressure exceeds the threshold value of settlement in the second cavity, gas can be discharged through relief mechanism to make the gas in the second cavity obtain releasing, at this moment, the holding down plate resets, and relief mechanism resets after with unnecessary gas discharge, and first spring promotes the holding down plate to reset, because the pump still continuously fills gas in the second cavity, the holding down rod can intermittent type formula push down, realizes the purpose of intermittent type formula step on the brake.

Drawings

FIG. 1 is a schematic illustration of a brake assembly and an all-terrain vehicle thereof according to the present utility model;

FIG. 2 is an enlarged schematic view of the structure of FIG. 1A in accordance with the present utility model;

FIG. 3 is a schematic illustration of a service wheel brake plate structure of the present utility model;

FIG. 4 is a schematic structural view of the point brake of the present utility model;

FIG. 5 is an enlarged view of the utility model at B in FIG. 4;

fig. 6 is an enlarged view of fig. 4 at C in accordance with the present utility model.

In the figure: all-terrain vehicle body 1, running-board 2, front wheel 3, rear wheel 4, handlebar 5, first wheel is stopped 6, second wheel is stopped 7, pedal wheel is stopped board 8, axis of rotation 9, supporting seat 10, protection shield 11, bracing piece 12, some structure 13 of stopping, elastic connection pad 14, upward depression bar 15, upward depression plate 16, baffle 17, inflator 18, first cavity 19, holding down plate 20, down lever 21, first spring 22, second cavity 23, telescopic shell 24, pressure release hole 25, second spring 26, first round hole section 27, second round hole section 28, guide bar 29, pressure release plate 30, inclined plane 31, pressure post 32, inflator switch 33, telescopic slot 34, third spring 35, limiting plate 36, intercommunicating pore 37.

Detailed Description

The following detailed description of the present application is provided in conjunction with the accompanying drawings, and it is to be understood that the following detailed description is merely illustrative of the application and is not to be construed as limiting the scope of the application, since numerous insubstantial modifications and adaptations of the application will be to those skilled in the art in light of the foregoing disclosure.

Example 1

As shown in fig. 1 to 6, a brake assembly comprises a pedal wheel brake plate 8, wherein in order to solve the problem that a reasonable brake mode that a driver needs to be tested on psychological quality and experience of the driver when the driver steps on a brake is needed, a point brake structure 13 is arranged on the lower surface of the pedal wheel brake plate 8, when the pedal wheel brake plate 8 is stepped on, the point brake structure 13 can intermittently stretch, so that the automatic control of the one-step-on-one-brake mode is realized, the manual operation is replaced, the operation on the bumpy road is simpler, and the requirement on the driver is lower.

Specifically, the point structure of stopping 13 includes upward depression bar 15, flexible shell 24, lower depression bar 21, upward the upper end fixedly connected with elastic connection pad 14 of depression bar 15, elastic connection pad 14's upper end fixed setting is in the bottom surface of pedal wheel brake board 8, upward the lower extreme activity of depression bar 15 stretches into flexible shell 24's inside, upward the one end fixedly connected with top board 16 of depression bar 15 activity stretches into flexible shell 24 inside, the upper end activity of depression bar 21 stretches into flexible shell 24 inside is provided with holding down plate 20, flexible shell 24's inside fixedly welded has baffle 17, baffle 17 is located between top board 16 and the holding down plate 20, form first cavity 19 between top board 16 and the baffle 17, form second cavity 23 between baffle 17 and the holding down plate 20, the fixed welding of lower surface of holding down plate 20 has first spring 22, the lower extreme fixed welding of first spring 22 is on flexible shell 24's bottom surface, one side of second cavity 23 is provided with pressure charging mechanism, the opposite side of second cavity 23 is provided with pressure releasing mechanism, one side of first cavity 19 is provided with switch assembly.

When the driver steps on the pedal wheel brake plate 8, the pedal wheel brake plate 8 compresses the elastic connection pad 14 and then continuously drives the upper pressing rod 15 to press downwards, so that the upper pressing rod 16 contacts the switch assembly, the switch assembly controls the opening of the pressurizing mechanism, the second chamber 23 is continuously inflated after the opening of the pressurizing mechanism, higher air pressure is generated in the second chamber 23, the lower pressing rod 20 is driven to descend under the action of air pressure pushing, the lower pressing rod 21 descends under the descending of the lower pressing plate 20, and the operation of stepping on the brake is realized.

And along with the continuous rising of atmospheric pressure in second cavity 23, after the atmospheric pressure in second cavity 23 exceeds the threshold value of settlement, gas can be discharged through pressure release mechanism to make the gas in second cavity 23 obtain releasing, at this moment, holding down plate 20 resets, and pressure release mechanism resets after discharging unnecessary gas, and first spring 22 promotes holding down plate 20 to reset, because pump 18 still continuously fills gas into second cavity 23, and pressure release lever 21 can intermittent type formula push down, realizes the purpose of intermittent type formula step on the brake.

The switch assembly comprises a pressing column 32, an inflator switch 33, a communication hole 37, a telescopic groove 34, a third spring 35 and a limiting plate 36, wherein the communication hole 37 simultaneously penetrates through the inner surface and the outer surface of the telescopic shell 24, one end of the communication hole 37 penetrates through the inner surface of the telescopic shell 24 to be communicated with the inside of the first chamber 19, the inflator switch 33 is arranged on the inflator 18, the inflator switch 33 is clamped at one end, close to the outer surface of the telescopic shell 24, of the communication hole 37, the pressing column 32 is movably arranged in the communication hole 37, one end of the pressing column 32 is movably attached to the surface of the inflator switch 33, the other end of the pressing column 32 stretches into the first chamber 19, one end, stretching into the first chamber 19, of the pressing column 32 stretches into the hemispherical shape, the telescopic groove 34 is arranged on the inner wall of the communication hole 37, the limiting plate 36 is fixedly welded at the outer ring, close to one end of the pressing column 32, the third spring 35 is fixedly welded at one side, close to the inflator switch 33, the other end of the third spring 35 is fixedly welded at one side, close to the inner wall of the telescopic groove 34, close to the first chamber 19, one end, stretching into the first chamber 19 corresponds to the lower side of the upper pressing plate 16, one end of the pressing column 32 is pressed into the pressing column 32, one end of the pressing column 32 is pressed into the upper pressing plate 16, the upper pressing plate 32 is pressed into the upper pressing plate 32, the upper pressing plate 32 is reset plate 32 is pressed into the upper pressing plate 16, and the upper pressing plate 32 is reset, and the pressing plate 32 is pressed into the pressing plate 32 is pressed when the pressing plate 32 is pressed, and the pressing plate is pressed into the upper pressing plate 16, and is pressed.

The inflation mechanism specifically comprises an inflator 18, the inflator 18 is fixedly arranged on the outer surface of the telescopic shell 24, the inflator 18 is communicated with the inside of the second chamber 23, and the inflator 18 inflates the second chamber 23 when opened.

The pressure release mechanism comprises a pressure release hole 25, a pressure release plate 30, a guide rod 29 and a second spring 26, wherein the pressure release hole 25 is arranged on the telescopic shell 24, the pressure release hole 25 is communicated between the outside of the telescopic shell 24 and the second chamber 23, the pressure release hole 25 comprises a second round hole section 28 and a first round hole section 27, the diameter of the second round hole section 28 is larger than that of the first round hole section 27, the second round hole section 28 is communicated with the outside of the telescopic shell 24, the first round hole section 27 is communicated with the second chamber 23, the pressure release plate 30 is movably arranged in the second round hole section 28, the second spring 26 is fixedly welded on one side of the pressure release plate 30 close to the first round hole section 27, the second spring 26 is fixedly welded on the inner wall of one side of the second round hole section 28 close to the first round hole section 27, the guide rod 29 is fixedly welded at the middle part of one surface of the pressure relief plate 30, which is close to the first round hole section 27, the guide rod 29 movably penetrates through the middle part of the first round hole section 27, an inclined surface 31 is arranged at the corner of one surface of the pressure relief plate 30, which is close to the first round hole section 27, when the gas pressure in the second chamber 23 is too high and exceeds the tension of the second spring 26 on the pressure relief plate 30, the pressure relief plate 30 is pushed to the end, far away from the first round hole section 27, of the second round hole section 28 by the gas, so that the pressure relief hole 25 is opened, at the moment, the gas in the second chamber 23 is released, the pressure relief plate 30 loses the thrust of the gas after the gas in the second chamber 23 is released, and the second spring 26 pulls the pressure relief plate 30 to reset.

It should be noted that, the diameter of the guide rod 29 is smaller than that of the first circular hole section 27, and the purpose of the guide rod 29 is to avoid that the pressure relief plate 30 is not easy to reset into the pressure relief hole 25 when extending out of the pressure relief hole 25 too long, and the guide rod 29 and the inclined surface 31 have a certain guiding function in combination.

The utility model also discloses an all-terrain vehicle, which comprises any one of the brake components and further comprises:

the all-terrain vehicle comprises an all-terrain vehicle body 1, wherein a pedal plate 2 is arranged at the lower end of the all-terrain vehicle body 1, the lower end of a pressing rod 21 is arranged on the pedal plate 2, and a pedal wheel brake plate 8 is arranged above the pedal plate 2.

Be provided with two handles 5 on the all-terrain vehicle body 1, still be provided with two front wheels 3 and two rear wheels 4 on the all-terrain vehicle body 1, be provided with first wheel on two handles 5 respectively and stop 6 and second wheel and stop 7, first wheel is stopped 6 and is used for controlling rear wheel 4 brake, second wheel is stopped 7 and is used for controlling front wheel 3 brake.

The utility model uses the first wheel brake 6, the second wheel brake 7 and the pedal wheel brake plate 8 at the same time, can realize the sudden braking of the rear wheel 4, the sudden braking of the front wheel 3 and the spot braking of the front wheel 3 and the rear wheel 4, and is convenient to use.

Considering that the pedal plate 2 is pedal by people, in order to avoid the foot to touch the pedal wheel brake plate 8 by mistake, a protection component for protecting the pedal wheel brake plate 8 is arranged above the pedal plate 2, the protection component comprises a supporting seat 10, a protection plate 11 and a supporting rod 12, the supporting seat 10 is fixedly welded on the upper surface of the pedal plate 2, the upper end of the supporting seat 10 is rotationally connected with one end of the protection plate 11 through a rotating shaft 9, the supporting rod 12 is fixedly welded on one surface of the protection plate 11, which is close to the pedal wheel brake plate 8, the supporting rod 12 corresponds to one end of the protection plate 11, which is far away from the rotating shaft 9, the protection plate 11 is positioned on one side of the pedal wheel brake plate 8, and the protection plate 11 can rotate by taking the rotating shaft 9 as a shaft to block the upper part of the pedal wheel brake plate 8, so that the foot of people can tread the protection plate 11, and error collision to the pedal wheel brake plate 8 is avoided, the situation can be used on a gentle road surface when the road surface is in a gentle, the pedal wheel brake plate 8 is generally not needed, and the foot can be pushed to open when needed.

It should be noted that, the elastic connection pad 14 is provided to avoid the phenomenon that the inclination of the pedal wheel brake plate 8 cannot be changed when the pedal wheel brake plate 8 is stepped on, and the connection mode between the pressing rod 21 and the pedal plate 2 is the connection mode between the existing brake plate and the pedal plate 2, which is a common brake mechanism, and will not be described in detail herein, the utility model only changes the connection position between the lower part of the original pedal wheel brake plate 8 and the pressing rod 21, thereby realizing the purpose of automatic intermittent brake.

The foregoing examples illustrate only a few embodiments of the utility model and are described in detail herein without thereby limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model.

Claims

1. The utility model provides a brake subassembly, includes pedal wheel brake board (8), its characterized in that, the lower surface of pedal wheel brake board (8) is provided with some structure of stopping (13), some structure of stopping (13) are including last depression bar (15), flexible shell (24), depression bar (21) down, the upper end fixedly connected with elastic connection pad (14) of last depression bar (15), the fixed bottom surface that sets up in pedal wheel brake board (8) of elastic connection pad (14), the inside of flexible shell (24) is stretched into in the activity of the lower extreme of last depression bar (15), the inside one end fixedly connected with top board (16) of flexible shell (24) is stretched into in the activity of top board (15), the inside one end of flexible shell (24) is stretched into in the activity of depression bar (21) down is provided with depression bar (20), the inside fixedly welded with baffle (17) of flexible shell (24), baffle (17) are located between top board (16) and depression bar (20), the inside one end fixedly welded with baffle (17) and the inside one end of depression bar (24) is stretched into in the inside one end of flexible shell (24), the inside one end of depression bar (20) is stretched into one side, one side of first cavity (20) and second cavity (20) are formed between top board (17), the lower end of the first spring (22) is fixedly welded on the inner wall of the bottom surface of the telescopic shell (24), one side of the second chamber (23) is provided with a pressurizing mechanism, the other side of the second chamber (23) is provided with a pressure release mechanism, and one side of the first chamber (19) is provided with a switch assembly.

2. A brake assembly according to claim 1, wherein: the inflation mechanism comprises an inflator pump (18), the inflator pump (18) is fixedly arranged on the outer surface of the telescopic shell (24), and the inflator pump (18) is communicated with the inside of the second chamber (23).

3. A brake assembly according to claim 1, wherein: the pressure release mechanism comprises a pressure release hole (25), a pressure release plate (30), a guide rod (29) and a second spring (26), the pressure release hole (25) is formed in a telescopic shell (24), the pressure release hole (25) is communicated between the outside of the telescopic shell (24) and a second cavity (23), the pressure release hole (25) comprises a second round hole section (28) and a first round hole section (27), the diameter of the second round hole section (28) is larger than that of the first round hole section (27), the second round hole section (28) is communicated with the outside of the telescopic shell (24), the first round hole section (27) is communicated with the second cavity (23), the pressure release plate (30) is movably arranged in the second round hole section (28), the second spring (26) is fixedly welded on one side of the second round hole section (28) close to the first round hole section (27), the guide rod (29) is fixedly welded on one side inner wall of the second round hole section (28) close to the first round hole section (27), the guide rod (29) is fixedly arranged on the middle part of the guide rod (30) close to the first round hole section (27), and the pressure release plate (30) is movably arranged on the middle part of the guide rod (27) close to the first round hole section (27).

4. A brake assembly according to claim 1, wherein: the switch assembly comprises a pressing column (32), an inflator switch (33), a communication hole (37), a telescopic groove (34), a third spring (35) and a limiting plate (36), wherein the communication hole (37) simultaneously penetrates through the inner surface and the outer surface of the telescopic shell (24), one end of the communication hole (37) penetrating through the inner surface of the telescopic shell (24) is communicated with the inside of the first cavity (19), the inflator switch (33) is mounted on the inflator (18), the inflator switch (33) is clamped at one end, close to the outer part of the telescopic shell (24), of the communication hole (37), the pressing column (32) is movably arranged in the communication hole (37), one end of the pressing column (32) is movably attached to the surface of the inflator switch (33), the other end of the pressing column (32) stretches into the first cavity (19), one end, stretching into the first cavity (19), of the pressing column (32) is hemispherical, the telescopic groove (34) is arranged on the inner wall of the communication hole (37), the limiting plate (36) is fixedly welded at one end, close to the inflator switch (33), one end, close to the outer ring (35) of the inflating switch (33) is welded at one end, close to the first side, and the other end, close to the third spring (35) is fixedly welded at one side, close to the inner wall of the first cavity (35), one end of the pressing column (32) extending into the first chamber (19) corresponds to the lower part of the upper pressing plate (16).

5. An all-terrain vehicle, characterized in that: a brake assembly as claimed in any one of claims 1 to 4, further comprising:

the all-terrain vehicle comprises an all-terrain vehicle body (1), wherein a pedal plate (2) is arranged at the lower end of the all-terrain vehicle body (1), the lower end of a pressing rod (21) is arranged on the pedal plate (2), and a pedal wheel brake plate (8) is arranged above the pedal plate (2).

6. An all-terrain vehicle as claimed in claim 5, wherein: the pedal wheel brake device is characterized in that a protection component used for protecting the pedal wheel brake plate (8) is arranged above the pedal plate (2), the protection component comprises a supporting seat (10), a protection plate (11) and a support rod (12), the supporting seat (10) is fixedly welded on the upper surface of the pedal plate (2), the upper end of the supporting seat (10) is rotationally connected with one end of the protection plate (11) through a rotating shaft (9), the support rod (12) is fixedly welded on one surface, close to the pedal wheel brake plate (8), of the protection plate (11), the support rod (12) corresponds to one end, away from the rotating shaft (9), of the protection plate (11), and the protection plate (11) is located on one side of the pedal wheel brake plate (8).

7. An all-terrain vehicle as claimed in claim 5, wherein: be provided with two handlebar (5) on all-terrain vehicle body (1), still be provided with two front wheels (3) and two rear wheels (4) on all-terrain vehicle body (1), be provided with first wheel (6) and second wheel (7) of stopping on two handlebar (5) respectively, first wheel (6) of stopping are used for controlling rear wheel (4) brake, second wheel (7) of stopping are used for controlling front wheel (3) brake.