Braking system, dual wheel steering drive axle and automobile

Abstract

The present invention belongs to the technical field of automobile braking system, and relates to a braking system, a dual-wheel steering drive axle and an automobile, comprising a driving motor mounted steering seat, a first driving motor, a first reduction mechanism, a first brake, a second driving motor, a second reduction mechanism and a second brake, wherein the output shaft of the first driving motor is connected to the input end of the first reduction mechanism, the output end of the first reduction mechanism is connected to the outer wheel, the output shaft of the second driving motor is connected to the input end of the second reduction mechanism, and the output end of the second reduction mechanism is connected to the inner wheel. The braking system of the present application realizes the braking of each of the dual wheels on the same side separately.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile braking systems and relates to a braking system, a double-wheel steering drive axle and an automobile. Background Art

[0002] The existing dual-wheel drive axles are equipped with brakes arranged separately on the left and right wheels. The brake air pressure or brake oil pressure is distributed to the brake cylinders through the brake pedal, the master brake cylinder and the brake pipe. The brake cylinders apply force to the brake disc friction lining or the brake drum brake shoe to produce a braking effect on the brake disc or the brake drum. The ABS needs to calculate the slip rate of the left and right wheel tires to distribute the braking force of the left and right brakes. However, this type of traditional mechanical brake has a complex structure and requires an air compressor or a vacuum booster pump. The whole mechanism occupies a large space and does not have the function of applying different braking forces to each of the four wheels (two rigidly assembled wheels on the left and right sides).

[0003] The existing EMB braking system uses an electric motor without air pressure and hydraulic transmission to drive a set of reduction gears and a worm gear transmission system to directly act on the brake disc. This type of braking system has a simplified structure and occupies less space. However, the corresponding dual-wheel drive rear axle is a rigidly assembled dual-wheel structure, which cannot achieve the braking of each of the dual wheels on the same side separately. Summary of the invention

[0004] The technical problem to be solved by the present invention is: to solve the problem that the existing dual-wheel drive rear axle cannot brake each of the dual wheels on the same side separately, and to provide a braking system, a dual-wheel steering drive axle and a vehicle.

[0005] In order to solve the above technical problems, on the one hand, the present invention provides a braking system. The braking system includes a driving motor mounting steering seat, a first driving motor, a first brake, a second driving motor and a second brake, wherein the first brake, the first driving motor, the second driving motor and the second brake are arranged in an internal space enclosed by an inner wheel and an outer wheel arranged side by side inside and outside, the first driving motor is mounted on the outer side of the lower end of the driving motor mounting steering seat, and the second driving motor is mounted on the inner side of the lower end of the driving motor mounting steering seat;

[0006] The first brake is used for braking the outer wheel, and the second brake is used for braking the inner wheel.

[0007] Optionally, a through hole extending inwardly and outwardly is provided at the lower end of the driving motor mounting steering seat, a first mounting seat is provided at the outer end of the through hole, a second mounting seat is provided at the inner end of the through hole, the housing of the first driving motor is fixed on the first mounting seat, and the housing of the second driving motor is fixed on the second mounting seat.

[0008] Optionally, the braking system further comprises a clutch device connected between the first drive motor and the second drive motor, wherein the clutch device is used to control the engagement and separation of an output shaft of the first drive motor and an output shaft of the second drive motor.

[0009] Optionally, the braking system further includes a first reduction mechanism and a second reduction mechanism, two ends of the first drive motor respectively pass through the housing of the first drive motor, an outer end of an output shaft of the first drive motor is connected to an input end of the first reduction mechanism, and an output end of the first reduction mechanism is connected to an outer wheel;

[0010] Two ends of the second drive motor respectively pass through the housing of the second drive motor, the inner end of the output shaft of the second drive motor is connected to the input end of the second reduction mechanism, and the output end of the second reduction mechanism is connected to the inner wheel;

[0011] The clutch device is connected between the inner end of the output shaft of the first drive motor and the outer end of the output shaft of the second drive motor, and the first brake, the first reduction mechanism, the first drive motor, the clutch device, the second drive motor, the second reduction mechanism and the second brake are arranged in sequence from outside to inside.

[0012] Optionally, the clutch device is a synchronizer, which includes an electric shift fork, a coupling sleeve, an engagement sleeve and a coupling tooth, wherein the electric shift fork is fixed in a through hole of the driving motor mounting steering seat, the coupling tooth is fixed to the inner end of the output shaft of the first driving motor, the coupling sleeve is provided with an inner spline hole, the coupling tooth is provided with a first outer spline that matches the spline of the inner spline hole, the engagement sleeve is fixed to the outer end of the output shaft of the second driving motor, the engagement sleeve is provided with a second outer spline, and the coupling sleeve is constantly engaged with the second outer spline through the inner spline hole to rotate synchronously with the output shaft of the second driving motor;

[0013] When the electric shift fork pushes the coupling sleeve outward, the coupling sleeve is spline-connected with the coupling teeth to couple the output shaft of the first drive motor with the output shaft of the second drive motor; when the electric shift fork pushes the coupling sleeve inward, the coupling sleeve is disengaged from the coupling teeth to separate the output shaft of the first drive motor from the output shaft of the second drive motor.

[0014] Optionally, the first brake comprises a first brake caliper and a first brake disc fixed to the outer wheel;

[0015] The first brake caliper includes a first caliper body, a first outer friction plate, a first inner friction plate, a first caliper body bracket, a first guide pin shaft, a first thrust mechanism and a first electric cam mechanism. The first outer friction plate is fixed on the outer cavity wall of the inner cavity of the first caliper body opposite to the outer surface of the first brake disc. The first inner friction plate is located between the inner surface of the first brake disc and the inner cavity wall of the inner cavity of the first caliper body opposite to the first brake disc. The first brake disc is located between the first outer friction plate and the first inner friction plate. The first caliper body bracket is fixed to the vehicle body. The first caliper body is slidably connected to the first guide pin shaft. On the first caliper body bracket, the first thrust mechanism is arranged on the first caliper body, the outer end of the first thrust mechanism is connected to the first inner friction plate, and the inner end of the first thrust mechanism protrudes from the first caliper body; the first electric cam mechanism is used to push the inner end of the first thrust mechanism so that the first thrust mechanism pushes the first inner friction plate to move outward and presses against the inner surface of the first brake disc and maintains it, and the first electric cam mechanism continues to apply a force so that the first thrust mechanism generates a reverse force to drive the first caliper body to move inward until the first outer friction plate is pressed against the outer surface of the first brake disc.

[0016] Optionally, the first thrust mechanism includes a first cylinder and a first piston, the first cylinder is disposed in the first caliper body, the first cylinder is enclosed with hydraulic oil, a first sliding column slidably connected in the first cylinder is disposed on the inner side of the first inner friction plate, a first end of the first piston is slidably connected in the first cylinder, and a second end of the first piston protrudes from the first caliper body;

[0017] The first electric cam mechanism includes a first motor and a first cam. The output shaft of the first motor is connected to the center of the base circle of the first cam. When the first motor rotates, it can drive the first cam to rotate, so that the first cam pushes the second end of the first piston.

[0018] Optionally, the second brake comprises a second brake caliper and a second brake disc fixed on the inner wheel;

[0019] The second brake caliper includes a second caliper body, a second outer friction plate, a second inner friction plate, a second caliper body bracket, a second guide pin shaft, a second thrust mechanism and a second electric cam mechanism. The second inner friction plate is fixed on the outer cavity wall of the inner cavity of the second caliper body opposite to the inner surface of the second brake disc. The second outer friction plate is located between the inner and outer surfaces of the second brake disc and the inner and outer cavity walls of the inner cavity of the second caliper body opposite to the second brake disc. The second brake disc is located between the second outer friction plate and the second inner friction plate. The second caliper body bracket is fixed to the vehicle body. The second caliper body is slidably connected to the second caliper body through the second guide pin shaft. On the second caliper body bracket, the second thrust mechanism is arranged on the second caliper body, the outer end of the second thrust mechanism is connected to the second outer friction plate, and the outer end of the second thrust mechanism protrudes from the second caliper body; the second electric cam mechanism is used to push the outer end of the second thrust mechanism so that the second thrust mechanism pushes the second outer friction plate to move inward and presses against the outer surface of the second brake disc and maintains it, and the second electric cam mechanism continues to apply a force so that the second thrust mechanism generates a reverse force to drive the second caliper body to move outward until the second inner friction plate is pressed against the inner surface of the second brake disc.

[0020] Optionally, the second thrust mechanism comprises a second cylinder and a second piston, the second cylinder is arranged in the second caliper body, the second cylinder is enclosed with hydraulic oil, a second sliding column slidably connected in the second cylinder is arranged on the inner side of the second inner friction plate, a first end of the second piston is slidably connected in the second cylinder, and a second end of the second piston protrudes from the second caliper body;

[0021] The second electric cam mechanism includes a second motor and a second cam. The output shaft of the second motor is connected to the center of the base circle of the second cam. When the second motor rotates, it can drive the second cam to rotate, so that the second cam pushes the second end of the second piston.

[0022] Optionally, the first reduction mechanism and the second reduction mechanism are two-stage planetary gear reduction mechanisms;

[0023] The first reduction mechanism includes a first primary planetary gear reduction mechanism and a first secondary planetary gear reduction mechanism, the sun gear of the first primary planetary gear reduction mechanism is connected to the outer end of the output shaft of the first drive motor, the planet carrier of the first primary planetary gear reduction mechanism is connected to the sun gear of the first secondary planetary gear reduction mechanism, and the planet carrier of the first secondary planetary gear reduction mechanism is connected to the outer wheel;

[0024] The second reduction mechanism includes a second-stage planetary gear reduction mechanism and a second-stage planetary gear reduction mechanism, the sun gear of the second-stage planetary gear reduction mechanism is connected to the inner end of the output shaft of the second drive motor, the planet carrier of the second-stage planetary gear reduction mechanism is connected to the sun gear of the second-stage planetary gear reduction mechanism, and the planet carrier of the second-stage planetary gear reduction mechanism is connected to the inner wheel.

[0025] The braking system provided by the embodiment of the present invention drives the outer wheel through the first drive motor and the first planetary reduction mechanism, drives the inner wheel through the second drive motor and the second planetary reduction mechanism, and the outer wheel and the inner wheel are braked by the first brake and the second brake respectively, so as to realize the braking of each wheel of the double wheels on the same side separately. In this way, the braking force can be separately distributed to the four wheels on the left and right sides (both the left and right sides are double wheels), which greatly improves the braking stability of the whole vehicle and the uniform wear of the tires of a single wheel.

[0026] On the other hand, an embodiment of the present invention also provides a dual-wheel steering drive axle, which includes an inner wheel, an outer wheel and the above-mentioned braking system, the inner wheel is arranged side by side on the inner side of the outer wheel, the upper end of the driving motor steering seat is installed through the gap between the inner wheel and the outer wheel, the output end of the first reduction mechanism is connected to the rim of the outer wheel, and the output end of the second reduction mechanism is connected to the rim of the inner wheel.

[0027] On the other hand, an embodiment of the present invention further provides a vehicle, which includes the above-mentioned braking system or dual-wheel steering drive axle. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of a braking system provided by an embodiment of the present invention;

[0029] Figure 2 is a schematic diagram of a first brake of a braking system provided by an embodiment of the present invention;

[0030] Figure 3 is another schematic diagram of a first brake of a braking system provided by an embodiment of the present invention;

[0031] Figure 4 is a schematic diagram of a second brake of a braking system provided by an embodiment of the present invention;

[0032] Figure 5 2 is another schematic diagram of the second brake of the braking system provided in one embodiment of the present invention.

[0033] The reference numerals in the specification are as follows:

[0034] 1. Drive motor mounted steering seat; 2. First drive motor; 3. First reduction mechanism; 31. First primary planetary gear reduction mechanism; 32. First secondary planetary gear reduction mechanism;

[0035] 4. first brake; 41. first caliper body; 42. first outer friction plate; 43. first inner friction plate; 431. first sliding column; 44. first caliper body bracket; 45. first guide pin shaft; 46. first thrust mechanism; 461. first piston; 462. hydraulic oil; 47. first electric cam mechanism; 471. first motor; 472. first cam;

[0036] 5. Second drive motor; 6. Second reduction mechanism; 61. Second primary planetary gear reduction mechanism; 62. Second secondary planetary gear reduction mechanism;

[0037] 7. second brake; 71. second caliper body; 72. second outer friction plate; 721. second sliding column; 73. second inner friction plate; 74. second caliper body bracket; 75. second guide pin shaft; 76. second thrust mechanism; 761. second piston; 762. hydraulic oil; 77. second electric cam mechanism; 771. second motor; 772. second cam;

[0038] 8. Synchronizer; 81. Electric shift fork; 82. Coupling sleeve; 83. Engaging sleeve; 84. Coupling teeth; 9. First brake disc; 10. Second brake disc; 11. Outer wheel; 12. Inner wheel. DETAILED DESCRIPTION

[0039] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] like Figures 1 to 5 As shown, the braking system provided by the embodiment of the present invention includes a drive motor mounted steering seat 1, a first drive motor 2, a first brake 4, a second drive motor 5 and a second brake 7. The first brake 4, the first reduction mechanism 3, the first drive motor 2, the second drive motor 5, the second reduction mechanism 6 and the second brake 7 are arranged in an internal space formed by an inner wheel 12 and an outer wheel 11 arranged side by side inside and outside. The first drive motor 2 is installed on the outer side of the lower end of the drive motor mounted steering seat 1, and the second drive motor 5 is installed on the inner side of the lower end of the drive motor mounted steering seat 1.

[0041] The first brake 4 is used for braking the outer wheel 11 , and the second brake 7 is used for braking the inner wheel 12 .

[0042] In one embodiment, a through hole extending inwardly and outwardly is provided at the lower end of the driving motor mounting steering seat 1, a first mounting seat (not shown in the figure) is provided at the outer end of the through hole, a second mounting seat (not shown in the figure) is provided at the inner end of the through hole, the housing of the first driving motor 2 is fixed on the first mounting seat, and the housing of the second driving motor 5 is fixed on the second mounting seat.

[0043] In one embodiment, the braking system further includes a clutch device connected between the first drive motor 2 and the second drive motor 5 , and the clutch device is used to control the coupling and separation of the output shaft of the first drive motor 2 and the output shaft of the second drive motor 5 .

[0044] In one embodiment, the braking system also includes a first reduction mechanism 3 and a second reduction mechanism 6, the two ends of the first drive motor 2 respectively pass through the housing of the first drive motor 2, the outer end of the output shaft of the first drive motor 2 is connected to the input end of the first reduction mechanism 3, and the output end of the first reduction mechanism 3 is connected to the outer wheel 11.

[0045] Both ends of the second drive motor 5 extend out of the housing of the second drive motor 5 , the inner end of the output shaft of the second drive motor 5 is connected to the input end of the second reduction mechanism 6 , and the output end of the second reduction mechanism 6 is connected to the inner wheel 12 .

[0046] The clutch device is connected between the inner end of the output shaft of the first drive motor 2 and the outer end of the output shaft of the second drive motor 5, and the first brake 4, the first reduction mechanism 3, the first drive motor 2, the clutch device, the second drive motor 5, the second reduction mechanism 6 and the second brake 7 are arranged in sequence from the outside to the inside.

[0047] In one embodiment, the clutch device is a synchronizer 8, which includes an electric shift fork 81, a coupling sleeve 82, an engagement sleeve 83 and a coupling tooth 84. The electric shift fork 81 is fixed in the through hole of the drive motor mounting steering seat 1, and the engagement tooth 84 is fixed to the inner end of the output shaft of the first drive motor 2. The coupling sleeve 82 is provided with an internal spline hole, and the engagement tooth 84 is provided with a first external spline that matches the spline of the internal spline hole. The engagement sleeve 83 is fixed to the outer end of the output shaft of the second drive motor 5, and the engagement sleeve 83 is provided with a second external spline. The coupling sleeve 82 is constantly engaged with the second external spline through the internal spline hole to rotate synchronously with the output shaft of the second drive motor 5.

[0048] When the electric shift fork 81 pushes the coupling sleeve 82 outward, the coupling sleeve 82 is spline-connected with the coupling teeth 84, so that the output shaft of the first drive motor 2 is coupled with the output shaft of the second drive motor 5. When the electric shift fork 81 pushes the coupling sleeve 82 inward, the coupling sleeve 82 is disengaged from the coupling teeth 84, so that the output shaft of the first drive motor 2 is separated from the output shaft of the second drive motor 5.

[0049] In one embodiment, if Figures 2 to 3 As shown, the first brake 4 includes a first brake caliper and a first brake disc 9 fixed on the outer wheel.

[0050] The first brake caliper includes a first caliper body 41, a first outer friction plate 42, a first inner friction plate 43, a first caliper body bracket 44, a first guide pin shaft 45, a first thrust mechanism 46 and a first electric cam mechanism 47. The first outer friction plate 42 is fixed on the outer cavity wall of the inner cavity of the first caliper body 41 opposite to the outer surface of the first brake disc 9. The first inner friction plate 43 is located between the inner surface of the first brake disc 9 and the inner cavity wall of the inner cavity of the first caliper body 41 opposite to the first brake disc 9. The first brake disc 9 is located between the first outer friction plate 42 and the first inner friction plate 43. The first caliper body bracket 44 is fixed on the vehicle body. The first caliper body 41 is slidably connected to the first guide pin shaft 45. On the first caliper body bracket 44, the first thrust mechanism 46 is arranged on the first caliper body 41, the outer end of the first thrust mechanism 46 is connected to the first inner friction plate 43, and the inner end of the first thrust mechanism 46 protrudes from the first caliper body 41; the first electric cam mechanism 47 is used to push the inner end of the first thrust mechanism 46, so that the first thrust mechanism 46 pushes the first inner friction plate 43 to move outward and press against the inner surface of the first brake disc 9 and maintain it, and the first electric cam mechanism 47 continues to apply a force so that the first thrust mechanism 46 generates a reverse hydraulic force to drive the first caliper body 41 to move inward until the first outer friction plate 42 is pressed against the outer surface of the first brake disc 9.

[0051] In one embodiment, the first thrust mechanism 46 includes a first cylinder (not shown in the figure) and a first piston 461. The first cylinder is disposed in the first caliper body 41. The first cylinder encloses hydraulic oil 462. A first sliding column 431 slidably connected in the first cylinder is disposed on the inner side of the first inner friction plate 43. The first end of the first piston 461 is slidably connected in the first cylinder, and the second end of the first piston 461 protrudes from the first caliper body 41.

[0052] The first electric cam mechanism 47 includes a first motor 471 and a first cam 472. The output shaft of the first motor 471 is connected to the center of the base circle of the first cam 472. When the first motor 471 rotates, it can drive the first cam 472 to rotate, so that the first cam 472 pushes the second end of the first piston 461.

[0053] The electric cam mechanism of the present invention can automatically control the lift of the brake cam and the clamping force of the friction plate on the brake disc according to the depth of the brake pedal to generate different braking forces. The entire mechanism has a simple and reliable structure and occupies very little space.

[0054] In one embodiment, if Figures 4 to 5 As shown, the second brake 7 includes a second brake caliper and a second brake disc 10 fixed on the inner wheel.

[0055] The second brake caliper includes a second caliper body 71, a second outer friction plate 72, a second inner friction plate 73, a second caliper body bracket 74, a second guide pin shaft 75, a second thrust mechanism 76 and a second electric cam mechanism 77. The second inner friction plate 73 is fixed on the outer cavity wall of the inner cavity of the second caliper body 71 opposite to the inner surface of the second brake disc 10. The second outer friction plate 72 is located between the inner and outer surfaces of the second brake disc 10 and the inner and outer cavity walls of the inner cavity of the second caliper body 71 opposite to the second brake disc 10. The second brake disc 10 is located between the second outer friction plate 72 and the second inner friction plate 73. The second caliper body bracket 74 is fixed to the vehicle body. The second caliper body 71 is slidably connected to the vehicle body through the second guide pin shaft 75. The second thrust mechanism 76 is connected to the second caliper body bracket 74, and is arranged on the second caliper body 71. The outer end of the second thrust mechanism 76 is connected to the second outer friction plate 72, and the outer end of the second thrust mechanism 76 protrudes from the second caliper body 71; the second electric cam mechanism 77 is used to push the outer end of the second thrust mechanism 76, so that the second thrust mechanism 76 pushes the second outer friction plate 72 to move inward and presses and maintains the outer surface of the second brake disc 10, and the second electric cam mechanism 77 continues to apply a force so that the second thrust mechanism 76 generates a reverse force to drive the second caliper body 71 to move outward until the second inner friction plate 73 is pressed against the inner surface of the second brake disc 10.

[0056] In one embodiment, the second thrust mechanism 76 includes a second cylinder and a second piston 761, the second cylinder is disposed in the second caliper body 71, the second cylinder is enclosed with hydraulic oil 762, a second sliding column 721 slidably connected in the second cylinder is disposed on the inner side of the second inner friction plate 73, the first end of the second piston 761 is slidably connected in the second cylinder, and the second end of the second piston 761 protrudes from the second caliper body 71.

[0057] The second electric cam mechanism 77 includes a second motor 771 and a second cam 772. The output shaft of the second motor 771 is connected to the center of the base circle of the second cam 772. When the second motor 771 rotates, it can drive the second cam 772 to rotate, so that the second cam 772 pushes the second end of the second piston 761.

[0058] The second electric cam mechanism 77 can automatically control the lift of the second cam 772 and the clamping force of the second outer friction plate 72 and the second inner friction plate 73 on the second brake disc 10 according to the depth of the brake pedal, thereby generating braking forces of different sizes. The entire mechanism has a simple and reliable structure and occupies very little space. During the deceleration and braking process, on the one hand, when the brake pedal is stepped on, the motor of the electric cam mechanism (the first electric cam mechanism 47 and / or the second electric cam mechanism 77) rotates, driving the respective cams to rotate, pushing the respective inner and outer friction plates to move, clamping the respective brake discs, and generating braking forces. The magnitude of the braking force is calculated according to the slip rate of each wheel by the ABS, thereby controlling the stroke of the cam, and applying different appropriate optimal braking forces to the brake disc corresponding to each wheel. On the other hand, the first drive motor and the second drive motor can also generate appropriate reverse braking forces of the drive motor according to the braking feedback power generation strategy of the whole vehicle, so that the whole vehicle can complete deceleration and parking braking. The electric brake cam is used as the power of the brake, eliminating the entire set of air supply and storage devices such as the air compressor, which greatly reduces the cost, increases the layout space, simplifies the number of parts, and improves the reliability and durability of the vehicle's parts.

[0059] In one embodiment, the first reduction mechanism 3 and the second reduction mechanism 6 are two-stage planetary gear reduction mechanisms.

[0060] The first reduction mechanism 3 includes a first-stage planetary gear reduction mechanism 31 and a first-stage planetary gear reduction mechanism 32, the sun gear of the first-stage planetary gear reduction mechanism 31 is connected to the outer end of the output shaft of the first drive motor 2, the planet carrier of the first-stage planetary gear reduction mechanism 31 is connected to the sun gear of the first-stage planetary gear reduction mechanism 32, and the planet carrier of the first-stage planetary gear reduction mechanism 32 is connected to the outer wheel 11.

[0061] The second reduction mechanism 6 includes a second first-stage planetary gear reduction mechanism 61 and a second second-stage planetary gear reduction mechanism 62, the sun gear of the second first-stage planetary gear reduction mechanism 61 is connected to the inner end of the output shaft of the second drive motor 5, the planet carrier of the second first-stage planetary gear reduction mechanism 61 is connected to the sun gear of the second second-stage planetary gear reduction mechanism 62, and the planet carrier of the second second-stage planetary gear reduction mechanism 62 is connected to the inner wheel 12.

[0062] The braking system provided by the embodiment of the present invention drives the outer wheel through the first drive motor and the first planetary reduction mechanism, drives the inner wheel through the second drive motor and the second planetary reduction mechanism, and the outer wheel and the inner wheel are braked by the first brake and the second brake respectively, so as to realize the braking of each wheel of the double wheels on the same side separately. In this way, the braking force can be separately distributed to the four wheels on the left and right sides (both the left and right sides are double wheels), which greatly improves the braking stability of the whole vehicle and the uniform wear of the tires of a single wheel.

[0063] In other embodiments, the clutch device may also be a clutch or a brake.

[0064] In addition, an embodiment of the present invention further provides a dual-wheel steering drive axle, which includes an inner wheel 12, an outer wheel 11 and the braking system of the above embodiment. The inner wheel 12 is arranged side by side on the inner side of the outer wheel 11, the upper end of the driving motor mounting steering seat 1 passes through the gap between the inner wheel 12 and the outer wheel 11, the output end of the first reduction mechanism 3 is connected to the rim of the outer wheel 11, and the output end of the second reduction mechanism 6 is connected to the rim of the inner wheel 12.

[0065] The second drive motor 5 and the first drive motor 2 are symmetrically arranged on the inner and outer sides of the drive motor mounting steering seat 1, which has the following advantages:

[0066] (1) Eliminate the vibration when the two motors are combined when the two wheels are in motion.

[0067] (2) When the dual wheels are in dynamic state, the rotational inertia of the two motors is the same, which reduces vibration.

[0068] (3) When both wheels are at rest, the wheel loads of the outer wheel 11 and the inner wheel 12 are the same, so that the outer wheel 11 and the inner wheel 12 wear evenly.

[0069] (4) When steering two wheels, avoid the torque of the two motors affecting the steering.

[0070] In addition, an embodiment of the present invention further provides a car, which includes the braking system or the dual-wheel steering drive axle of the above embodiment.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A braking system, characterized in that: The invention comprises a driving motor mounting steering seat, a first driving motor, a first brake, a second driving motor and a second brake, wherein the first brake, the first driving motor, the second driving motor and the second brake are arranged in an internal space enclosed by an inner wheel and an outer wheel arranged side by side inside and outside, the first driving motor is mounted on the outer side of the lower end of the driving motor mounting steering seat, and the second driving motor is mounted on the inner side of the lower end of the driving motor mounting steering seat; The first brake is used for braking the outer wheel, and the second brake is used for braking the inner wheel; The brake system further includes a clutch device connected between the first drive motor and the second drive motor, the clutch device being used to control the engagement and separation of the output shaft of the first drive motor and the output shaft of the second drive motor; The braking system further includes a first reduction mechanism and a second reduction mechanism, wherein two ends of the first drive motor respectively pass through a housing of the first drive motor, an outer end of an output shaft of the first drive motor is connected to an input end of the first reduction mechanism, and an output end of the first reduction mechanism is connected to an outer wheel; Two ends of the second drive motor respectively pass through the housing of the second drive motor, the inner end of the output shaft of the second drive motor is connected to the input end of the second reduction mechanism, and the output end of the second reduction mechanism is connected to the inner wheel; The clutch device is connected between the inner end of the output shaft of the first drive motor and the outer end of the output shaft of the second drive motor.

2. The braking system according to claim 1, characterized in that: The lower end of the driving motor mounting steering seat is provided with a through hole extending inwardly and outwardly, the outer end of the through hole is provided with a first mounting seat, the inner end of the through hole is provided with a second mounting seat, the housing of the first driving motor is fixed on the first mounting seat, and the housing of the second driving motor is fixed on the second mounting seat.

3. The braking system according to claim 1, characterized in that: The first brake, the first reduction mechanism, the first drive motor, the clutch device, the second drive motor, the second reduction mechanism and the second brake are arranged in sequence from outside to inside.

4. The braking system according to claim 3, characterized in that: The clutch device is a synchronizer, and the synchronizer includes an electric shift fork, a coupling sleeve, an engagement sleeve and a coupling tooth. The electric shift fork is fixed in the through hole of the driving motor mounting steering seat, the coupling tooth is fixed to the inner end of the output shaft of the first driving motor, the coupling sleeve is provided with an inner spline hole, the coupling tooth is provided with a first outer spline that matches the spline of the inner spline hole, the engagement sleeve is fixed to the outer end of the output shaft of the second driving motor, the engagement sleeve is provided with a second outer spline, and the coupling sleeve is constantly engaged with the second outer spline through the inner spline hole to rotate synchronously with the output shaft of the second driving motor; When the electric shift fork pushes the coupling sleeve outward, the coupling sleeve is spline-connected with the coupling teeth to couple the output shaft of the first drive motor with the output shaft of the second drive motor; when the electric shift fork pushes the coupling sleeve inward, the coupling sleeve is disengaged from the coupling teeth to separate the output shaft of the first drive motor from the output shaft of the second drive motor.

5. The braking system according to claim 1, characterized in that: The first brake includes a first brake caliper and a first brake disc fixed to the outer wheel; The first brake caliper includes a first caliper body, a first outer friction plate, a first inner friction plate, a first caliper body bracket, a first guide pin shaft, a first thrust mechanism and a first electric cam mechanism. The first outer friction plate is fixed on the outer cavity wall of the inner cavity of the first caliper body opposite to the outer surface of the first brake disc. The first inner friction plate is located between the inner surface of the first brake disc and the inner cavity wall of the inner cavity of the first caliper body opposite to the first brake disc. The first brake disc is located between the first outer friction plate and the first inner friction plate. The first caliper body bracket is fixed to the vehicle body. The first caliper body is slidably connected to the first guide pin shaft. On the first caliper body bracket, the first thrust mechanism is arranged on the first caliper body, the outer end of the first thrust mechanism is connected to the first inner friction plate, and the inner end of the first thrust mechanism protrudes from the first caliper body; the first electric cam mechanism is used to push the inner end of the first thrust mechanism so that the first thrust mechanism pushes the first inner friction plate to move outward and presses against the inner surface of the first brake disc and maintains it, and the first electric cam mechanism continues to apply a force so that the first thrust mechanism generates a reverse force to drive the first caliper body to move inward until the first outer friction plate is pressed against the outer surface of the first brake disc.

6. The braking system according to claim 5, characterized in that: The first thrust mechanism comprises a first cylinder and a first piston, wherein the first cylinder is disposed in the first caliper body, the first cylinder is enclosed with hydraulic oil, a first sliding column slidably connected in the first cylinder is disposed on the inner side of the first inner friction plate, a first end of the first piston is slidably connected in the first cylinder, and a second end of the first piston protrudes from the first caliper body; The first electric cam mechanism includes a first motor and a first cam. The output shaft of the first motor is connected to the center of the base circle of the first cam. When the first motor rotates, it can drive the first cam to rotate, so that the first cam pushes the second end of the first piston.

7. The braking system according to claim 1 or 5, characterized in that: The second brake includes a second brake caliper and a second brake disc fixed to the inner wheel; The second brake caliper includes a second caliper body, a second outer friction plate, a second inner friction plate, a second caliper body bracket, a second guide pin shaft, a second thrust mechanism and a second electric cam mechanism. The second inner friction plate is fixed on the outer cavity wall of the inner cavity of the second caliper body opposite to the inner surface of the second brake disc. The second outer friction plate is located between the inner and outer surfaces of the second brake disc and the inner and outer cavity walls of the inner cavity of the second caliper body opposite to the second brake disc. The second brake disc is located between the second outer friction plate and the second inner friction plate. The second caliper body bracket is fixed to the vehicle body. The second caliper body is slidably connected to the second caliper body through the second guide pin shaft. On the second caliper body bracket, the second thrust mechanism is arranged on the second caliper body, the outer end of the second thrust mechanism is connected to the second outer friction plate, and the outer end of the second thrust mechanism protrudes from the second caliper body; the second electric cam mechanism is used to push the outer end of the second thrust mechanism so that the second thrust mechanism pushes the second outer friction plate to move inward and presses against the outer surface of the second brake disc and maintains it, and the second electric cam mechanism continues to apply a force so that the second thrust mechanism generates a reverse force to drive the second caliper body to move outward until the second inner friction plate is pressed against the inner surface of the second brake disc.

8. The braking system according to claim 7, characterized in that: The second thrust mechanism comprises a second cylinder and a second piston, wherein the second cylinder is arranged in the second caliper body, the second cylinder is enclosed with hydraulic oil, a second sliding column slidably connected in the second cylinder is arranged on the inner side of the second inner friction plate, a first end of the second piston is slidably connected in the second cylinder, and a second end of the second piston protrudes from the second caliper body; The second electric cam mechanism includes a second motor and a second cam. The output shaft of the second motor is connected to the center of the base circle of the second cam. When the second motor rotates, it can drive the second cam to rotate, so that the second cam pushes the second end of the second piston.

9. The braking system according to claim 1, characterized in that: The first reduction mechanism and the second reduction mechanism are two-stage planetary gear reduction mechanisms; The first reduction mechanism includes a first primary planetary gear reduction mechanism and a first secondary planetary gear reduction mechanism, the sun gear of the first primary planetary gear reduction mechanism is connected to the outer end of the output shaft of the first drive motor, the planet carrier of the first primary planetary gear reduction mechanism is connected to the sun gear of the first secondary planetary gear reduction mechanism, and the planet carrier of the first secondary planetary gear reduction mechanism is connected to the outer wheel; The second reduction mechanism includes a second-stage planetary gear reduction mechanism and a second-stage planetary gear reduction mechanism, the sun gear of the second-stage planetary gear reduction mechanism is connected to the inner end of the output shaft of the second drive motor, the planet carrier of the second-stage planetary gear reduction mechanism is connected to the sun gear of the second-stage planetary gear reduction mechanism, and the planet carrier of the second-stage planetary gear reduction mechanism is connected to the inner wheel.

10. A dual-wheel steering drive axle, characterized in that: It comprises an inner wheel, an outer wheel and a braking system as claimed in any one of claims 1 to 9, wherein the inner wheel is arranged side by side on the inner side of the outer wheel, the upper end of the driving motor mounting steering seat passes through the gap between the inner wheel and the outer wheel, the output end of the first reduction mechanism is connected to the rim of the outer wheel, and the output end of the second reduction mechanism is connected to the rim of the inner wheel.

11. A car, characterized in that: It comprises the braking system according to any one of claims 1 to 9 or the dual-wheel steering drive axle according to claim 10.

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