A five-axis all-wheel drive chassis braking system

Abstract

The invention discloses a five-axis all-wheel drive chassis braking system, comprising a first service brake gas cylinder, a foot brake valve, a first service relay valve, a composite brake air chamber, a second service brake gas cylinder, a foot brake valve, a second service relay valve, a parking brake gas cylinder, a one-way valve, a hand brake valve, and a parking relay valve; the first service brake gas cylinder, the foot brake valve, the first service relay valve, and the composite brake air chamber form a first service brake circuit; the second service brake gas cylinder, the foot brake valve, the second service relay valve, and the composite brake air chamber form a second service brake circuit, and the parking brake gas cylinder, the one-way valve, the hand brake valve, the parking relay valve, and the composite brake air chamber form a parking brake circuit; the invention has good coordination in braking performance, not only has high control accuracy and short braking distance, but also has controllability of the vehicle, avoids wheel locking and vehicle loss of control, so as to improve the driving stability and directional maneuverability of the vehicle.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle braking, and in particular relates to a five-axle all-wheel drive chassis braking system. Background Art

[0002] The five-axle wide-body vehicle is a brand-new project. The heavy-duty wide-body off-road vehicle chassis has poor braking coordination during braking. The braking system design of the five-axle wide-body off-road vehicle chassis must meet the requirements of a braking distance of ≤11.4m at an initial speed of 30km / h, a parking slope of 30% for the service brake system, and a parking slope of 15% for the parking brake system when the vehicle has a gross weight of 43t. The ABS system generally matched with the five-axle vehicle is the 6S-6M system, which has low control accuracy and the indirectly controlled wheels are prone to lock. Summary of the invention

[0003] The invention provides a five-axle all-wheel drive chassis braking system, and aims to solve the problem that the heavy wide-body off-road vehicle chassis has poor braking coordination and the indirect controlled wheels are prone to locking during braking.

[0004] In order to solve the above technical problems, the present invention provides a five-axis all-wheel drive chassis brake system, characterized in that it comprises a first service brake gas cylinder (10), a foot brake valve (23), a first service relay valve (11), a composite brake air chamber, a second service brake gas cylinder (18), a foot brake valve (23), a second service relay valve (3), a parking brake gas cylinder (19), a one-way valve (7), a hand brake valve (22), and a parking relay valve (13); the first service brake gas cylinder (10), the foot brake valve (23), the first service relay valve (11), and the composite brake air chamber constitute a ... The first driving brake circuit; the second driving brake air cylinder (18), the foot brake valve (23), the second driving relay valve (3), and the composite brake air chamber constitute the second driving brake circuit; the parking brake air cylinder (19), the one-way valve (7), the hand brake valve (22), the parking relay valve (13), and the composite brake air chamber constitute the parking brake circuit; each bridge is provided with a composite brake air chamber at a position corresponding to two wheels; the first and second bridges share a set of ABS solenoid valves, and the third, fourth, and fifth bridges are each independently equipped with a set of ABS solenoid valves; the first driving brake air cylinder (10) supplies a set of ABS solenoid valves to the foot brake valve (23); The air inlet of the first driving relay valve (11) is supplied with air, and the air inlet of the first driving relay valve (11) is supplied with air at the same time. An air outlet of the foot brake valve (23) controls the air inlet of the first driving relay valve (11). The air outlet of the first driving relay valve (11) is connected to the air inlet of the corresponding composite brake air chamber through the ABS solenoid valves in the fourth and fifth bridges respectively, so as to brake the fourth and fifth bridges; the second driving brake air storage bottle (18) supplies air to another air inlet of the foot brake valve (23), and supplies air to the air inlet of the second driving relay valve (3). The air outlet of the foot brake valve (23) controls the air inlet of the second driving relay valve (3 ), the air outlet of the second driving relay valve (3) is connected to the air inlet of the composite brake air chamber (20) through the ABS solenoid valves in the first, second and third bridges respectively, so as to brake the first, second and third bridges; the parking brake gas cylinder (19) supplies air to the air inlet of the hand brake valve (22) and the air inlet of the parking relay valve 13 through the one-way valve (7), the air outlet of the hand brake valve (22) controls the other air inlet of the parking relay valve (13), and the air outlet of the parking relay valve (13) is respectively connected to the air inlet on the other side of each composite brake air chamber in the first to fifth bridges for parking braking.

[0005] Beneficial effects: The present invention has good coordination in braking performance. By matching the ABS anti-lock braking system of 8S8M control mode (i.e., 8 wheel speed sensors, 8 ABS solenoid valves), the wheel speed sensors control the second, third, fourth, and fifth bridges, and each wheel is independently controlled by a separate wheel speed sensor and an ABS solenoid valve. Not only is the control accuracy high and the braking distance short, but the vehicle is also controllable, avoiding wheel locking and vehicle loss of control, so as to improve the driving stability and directional maneuverability of the vehicle. The controllability on the road surface with different left and right adhesion coefficients is achieved, sufficient braking force can be provided, and the requirements of frequent braking and small thermal decay can be met. At the same time, the braking response time of the first four and five bridges is consistent, the control accuracy is improved, the braking distance is short, and the braking performance is improved to a certain extent. Under the condition of the total weight of the vehicle being 43t, the braking distance of the initial speed of 30km / h is ≤11.4m, the parking slope of the service brake system is 30%, and the parking slope of the parking brake system is 15%. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 Structural schematic diagram of the present invention

[0007] Figure 2 ABS schematic diagram.

[0008] Among them: 1- compressed air pipe assembly; 2- first and second bridge ABS solenoid valves; 3- second driving relay valve; 4- five combination solenoid valves; 5- pressure limiting valve; 6- three combination solenoid valves; 7- one-way valve; 8- battery frame assembly; 9- distribution valve; 10- first driving brake gas cylinder; 11- driving relay valve; 12- auxiliary gas cylinder (20L); 13- parking relay valve; 14- three bridge ABS solenoid valves; 15- auxiliary gas cylinder (40L); 16- condenser module; 17- APU assembly; 18- second driving brake gas cylinder; 19- parking brake gas cylinder; 20- compound brake air chamber; 21- four-circuit protection valve; 22- hand brake valve; 23- foot brake valve; 24- ABS solenoid valve; 25- wheel speed sensor. DETAILED DESCRIPTION

[0009] In order to make the purpose, content and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below.

[0010] The invention provides a five-axle all-wheel drive chassis brake system, comprising a first service brake air cylinder (10), a foot brake valve (23), a first service relay valve (11), a composite brake air chamber (20), a second service brake air cylinder (18), a foot brake valve (23), a second service relay valve (3), a parking brake air cylinder (19), a one-way valve (7), a hand brake valve (22), and a parking relay valve (13);

[0011] The first service brake gas cylinder (10), the foot brake valve (23), the first service relay valve (11), and the composite brake air chamber (20) form a first service brake circuit; the second service brake gas cylinder (18), the foot brake valve (23), the second service relay valve (3), and the composite brake air chamber (20) form a second service brake circuit; the parking brake gas cylinder (19), the one-way valve (7), the hand brake valve (22), the parking relay valve (13), and the composite brake air chamber (20) form a parking brake circuit; the gas cylinders of each circuit are inflated by pumping air through an air compressor, passing through an air dryer and a four-circuit protection valve.

[0012] Each wheel of the second to fifth bridge is equipped with a wheel speed sensor to collect the speed of the wheel.

[0013] Each bridge is equipped with a compound brake chamber at the position corresponding to the two wheels; the first and second bridges share a set of ABS solenoid valves, which are installed near the second bridge; the third, fourth and fifth bridges are equipped with a set of ABS solenoid valves respectively;

[0014] The first service brake circuit acts on the fourth and fifth bridges. The first service brake air storage cylinder (10) supplies air to an air inlet 11 of a foot brake valve (23) and at the same time supplies air to an air inlet 1 of a first service relay valve (11). An air outlet 21 of the foot brake valve (23) controls an air inlet 4 of the first service relay valve (11). The air outlet 2 of the first service relay valve (11) is connected to the air inlet (11) of the composite brake air chamber (20) through the ABS solenoid valves in the fourth and fifth bridges, respectively, to brake the fourth and fifth bridges.

[0015] The second service brake circuit acts on the first, second and third bridges. The second service brake air storage cylinder (18) supplies air to another air inlet 12 of the foot brake valve (23) and supplies air to the air inlet 1 of the second service relay valve (3). The air outlet 22 of the foot brake valve (23) controls the air inlet 4 of the second service relay valve (3). The air outlet 2 of the second service relay valve (3) is connected to the air inlet 11 of the composite brake air chamber (20) through the ABS solenoid valves in the first, second and third bridges respectively; the first, second and third bridges are braked;

[0016] The parking brake gas storage cylinder (19) supplies air to the air inlet 11 of the hand brake valve (22) and the air inlet 1 of the parking relay valve 13 through the one-way valve (7). The air outlet 21 of the hand brake valve (22) controls the air inlet 4 of the parking relay valve (13). The air outlet 2 of the parking relay valve (13) is respectively connected to the air inlet (12) on the other side of the composite brake air chamber (20) in the first, second, third, fourth and fifth bridges for parking braking.

[0017] The system pressure of the air compressor is 10 bar, and the entire circuit pressure of the first service brake circuit and the second service brake circuit is 10 bar; in the second service brake circuit, a distribution valve (9) is connected between the outlet 22 of the foot brake valve (23) and the inlet 4 of the second service relay valve (3), and the pressure response time of the outlet 22 of the foot brake valve (23) is adjusted, thereby controlling the inlet 4 of the second service relay valve (3); in the parking brake circuit, the outlet pressure of the parking brake gas cylinder (19) is 10 bar, and a pressure limiting valve (5) for reducing the parking circuit pressure is matched between the four-circuit protection valve (21) and the parking brake gas cylinder (19).

[0018] The present invention can realize service braking, parking braking, emergency braking and auxiliary braking; service braking is used to slow down and stop the car; parking braking is used to stop the car in place or on a slope; emergency braking is used to brake by using a compression spring when a pressure accumulator fails to have a low pressure; auxiliary braking uses a retarder brake.

[0019] The present invention can provide sufficient braking force, can meet the requirements of frequent braking with small thermal decay, and at the same time, the braking response time of the front four and five bridges is consistent, the braking distance is short, and the braking performance is improved to a certain extent.

[0020] By matching the ABS anti-lock braking system of 8S8M control mode (i.e. 8 wheel speed sensors, 8 ABS solenoid valves), the wheel speed sensors control the second, third, fourth and fifth bridges, and each wheel is independently controlled by a separate wheel speed sensor and an ABS solenoid valve. Not only is the control accuracy high and the braking distance short, but the vehicle is also controllable, avoiding wheel locking and vehicle loss of control, so as to improve the driving stability and directional controllability of the vehicle. The principle of ABS system is shown in Figure 2 .

[0021] The number of teeth on the ABS bridge gear ring must be consistent; the air pipe from the ABS solenoid valve to the brake air chamber should be as short as possible and the longest should not exceed 1.5m.

[0022] The service brake system is designed as a dual-circuit brake system. When one circuit fails, the braking performance of the other circuit can still be normal, ensuring the safety of the vehicle. In order to avoid the brake nodding phenomenon, the first service brake circuit is designed to act on the fourth and fifth bridges, and the second service brake circuit acts on the first, second and third bridges.

[0023] The parking brake adopts a spring energy storage type and is equipped with a spring brake air chamber.

[0024] The emergency brake shares the same system with the parking brake and can brake the vehicle in an emergency.

[0025] Auxiliary braking uses retarder braking, which converts the vehicle's kinetic energy into heat energy to brake the vehicle.

[0026] The design of the present invention can provide sufficient braking force, can meet the requirements of frequent braking with small thermal decay, and at the same time, the braking response time of the front four and five bridges is consistent, the braking distance is short, and the braking performance is improved to a certain extent.

[0027] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A five-axis all-wheel drive chassis braking system, characterized in that: The invention comprises a first service brake gas cylinder (10), a foot brake valve (23), a first service relay valve (11), a composite brake air chamber, a second service brake gas cylinder (18), a foot brake valve (23), a second service relay valve (3), a parking brake gas cylinder (19), a one-way valve (7), a hand brake valve (22), and a parking relay valve (13); the first service brake gas cylinder (10), the foot brake valve (23), the first service relay valve (11), and the composite brake air chamber constitute a first service brake circuit; the second service brake gas cylinder (18), the foot brake valve (23), the second service relay valve (3), and the composite brake air chamber constitute a second service brake circuit. A parking brake air cylinder (19), a one-way valve (7), a hand brake valve (22), a parking relay valve (13), and a compound brake air chamber form a parking brake circuit; a compound brake air chamber is provided at positions corresponding to two wheels on each bridge; the first and second bridges share a set of ABS solenoid valves, and the third, fourth, and fifth bridges are each independently equipped with a set of ABS solenoid valves; the first service brake air cylinder (10) supplies air to an air inlet of a foot brake valve (23), and at the same time supplies air to an air inlet of a first service relay valve (11); an air outlet of the foot brake valve (23) controls an air inlet of the first service relay valve (11), and an air outlet of the first service relay valve (11) is connected to the air outlet of the first service relay valve (11) through four The ABS solenoid valves in the first, second and third axles are connected to the air inlets of the corresponding composite brake air chambers to brake the fourth and fifth axles; the second service brake air cylinder (18) supplies air to the other air inlet of the foot brake valve (23) and the air inlet of the second service relay valve (3); the air outlet of the foot brake valve (23) controls the other air inlet of the second service relay valve (3); the air outlet of the second service relay valve (3) is connected to the air inlet of the composite brake air chamber (20) through the ABS solenoid valves in the first, second and third axles respectively to brake the first, second and third axles; the parking brake air cylinder (19) supplies air to the air inlet of the hand brake valve (22) and the parking brake valve (22) through the one-way valve (7) at the same time. The air inlet of the driving relay valve (13) is used for air supply, the air outlet of the hand brake valve (22) controls the other air inlet of the parking relay valve (13), and the air outlet of the parking relay valve (13) is respectively connected to the air inlet on the other side of each composite brake air chamber in the first to fifth bridges for parking brake; the air compressor inflates the air storage cylinders of each circuit after passing through the air dryer and the four-circuit protection valve, and a wheel speed sensor is provided on each wheel of the second to fifth bridge; the distribution valve (9) is connected between the air outlet of the foot brake valve (23) and the other air inlet of the second driving relay valve (3); and a pressure limiting valve (5) is matched between the four-circuit protection valve (21) and the parking brake air storage cylinder (19).

2. The five-axle all-wheel drive chassis braking system according to claim 1, characterized in that: The ABS solenoid valve shared by the first and second bridges is installed near the second bridge.

3. The five-axis all-wheel drive chassis braking system according to claim 1, characterized in that: The system pressure of the air compressor is 10Bar.

4. The five-axle all-wheel drive chassis braking system according to claim 1, characterized in that: It also includes auxiliary gas cylinders to inflate the gas cylinders in each circuit.

5. The five-axis all-wheel drive chassis braking system according to claim 1, characterized in that: The compound brake chamber adopts a spring brake chamber.

6. The five-axle all-wheel drive chassis braking system according to claim 1, characterized in that: The air pipe from the ABS solenoid valve to the compound brake air chamber should be as short as possible and the longest length should not exceed 1.5m.

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