Drive-by-wire wet brake system and underground dumper

Abstract

The utility model discloses a drive-by-wire wet brake system which comprises an oil tank, a gear pump, a prefill valve, an energy accumulator, an electro-hydraulic proportional valve, a foot brake valve, a reverse shuttle valve, a brake pipeline and a plurality of wet brakes, an oil inlet of the gear pump is communicated with the oil tank, and an oil outlet of the gear pump is communicated with an oil inlet of the prefill valve. An oil outlet of the prefill valve is communicated with an energy accumulator, a control port of the prefill valve is respectively communicated with oil inlets of the electro-hydraulic proportional valve and the foot brake valve, oil outlets of the electro-hydraulic proportional valve and the foot brake valve are both communicated with an oil inlet of the reverse shuttle valve, and an oil outlet of the reverse shuttle valve is communicated with the brake pipeline. And the brake pipeline is respectively communicated with brake oil ports of the plurality of wet brakes. The electro-hydraulic proportional valve can be used for controlling the braking pipeline to actively brake the vehicle, so that the potential safety hazard of the vehicle is reduced, and the personnel safety is ensured.

Description

Technical Field

[0001] This utility model relates to the field of braking system technology. More specifically, this utility model relates to a drive-by-wire wet braking system and an underground dump truck. Background Technology

[0002] Currently, the tunnel environment in China is complex and narrow, with poor lighting, uneven terrain, and the road surface is often accompanied by mud and water accumulation. Therefore, the braking system of underground transport vehicles is required to have reliable braking performance and drive-by-wire control in order to ensure the safety of personnel and vehicles.

[0003] Traditional dump trucks' disc brakes have a small friction area, high unit pressure, high operating temperature, and poor heat dissipation, which can easily generate sparks when working underground. In contrast, the fully hydraulic braking system has become the standard configuration of the braking system for explosion-proof vehicles underground due to its advantages such as high reliability and maintenance-free operation. Currently, the most common fully hydraulic wet braking system is a single-circuit open hydraulic braking system, which is usually driven by a gear pump driven by the power system. The hydraulic oil passes through a one-way valve and enters the brake to control the braking of each tire.

[0004] During prolonged use, the aforementioned single-circuit open braking system may experience emergencies such as wear of the foot valve due to external working conditions, resulting in the inability to brake normally while the vehicle is in motion, thus greatly increasing the safety hazards of the vehicle. Utility Model Content

[0005] The purpose of this utility model is to provide a wire-controlled wet braking system and an underground dump truck. When the foot valve wears down and fails to brake properly, the electro-hydraulic proportional valve can be used to control the brake line to actively brake the vehicle, reducing vehicle safety hazards and ensuring personnel safety.

[0006] To achieve these objectives and other advantages according to this utility model, a drive-by-wire wet braking system is provided, comprising: an oil tank, a gear pump, a filling valve, an accumulator, an electro-hydraulic proportional valve, a foot brake valve, a reverse shuttle valve, a brake line, and multiple wet brakes. The oil inlet of the gear pump is connected to the oil tank, the oil outlet of the gear pump is connected to the oil inlet of the filling valve, the oil outlet of the filling valve is connected to the accumulator, the control port of the filling valve is connected to the oil inlets of the electro-hydraulic proportional valve and the foot brake valve respectively, the oil outlets of the electro-hydraulic proportional valve and the foot brake valve are both connected to the oil inlet of the reverse shuttle valve, the oil outlet of the reverse shuttle valve is connected to the brake line, and the brake line is connected to the brake ports of the multiple wet brakes respectively.

[0007] Preferably, the system further includes: a radiator and an overflow valve assembly, wherein the oil inlet of the radiator is connected to the bypass port of the filling valve, the oil outlet of the radiator is connected to the oil inlet of the overflow valve assembly, the oil outlet of the overflow valve assembly is connected to the forced circulation oil inlets of the plurality of wet brakes respectively, the oil return port of the overflow valve assembly is connected to the oil tank, and the forced circulation oil outlets of the plurality of wet brakes are all connected to the oil tank.

[0008] Preferably, it further includes: a system pressure sensor and a brake pressure sensor, the filling valve is also provided with a first detection port, and the system pressure sensor is provided at the first detection port for detecting system pressure;

[0009] A second detection port is provided on the brake pipeline, and the brake pressure sensor is located at the second detection port to detect the brake pressure.

[0010] Preferably, the filling valve is further provided with a third detection port, and a low-pressure alarm switch for the vehicle is provided at the third detection port.

[0011] Preferably, a fourth detection port is also provided on the brake pipeline, and a brake taillight switch is provided at the fourth detection port.

[0012] Preferably, a high-pressure oil filter is also provided between the oil tank and the gear pump, and a low-pressure oil filter is also provided between the forced circulation oil outlet of the plurality of wet brakes and the oil tank.

[0013] Preferably, the oil tank is also equipped with a temperature sensor and a liquid level sensor.

[0014] Preferably, at least one accumulator is provided, and all of the accumulators are connected to the oil outlet of the filling valve.

[0015] Preferably, the plurality of wet brakes include: a front axle left wet brake, a front axle right wet brake, a middle axle left wet brake, a middle axle right wet brake, a rear axle left wet brake, and a rear axle right wet brake.

[0016] The front axle left wet brake and the front axle right wet brake are connected in parallel to form a front axle brake group. The middle axle left wet brake and the middle axle right wet brake are connected in parallel to form a middle axle brake group. The rear axle left wet brake and the rear axle right wet brake are connected in parallel to form a rear axle brake group. The front axle brake group is located upstream of the middle axle brake group, and the middle axle brake group is located upstream of the rear axle brake group.

[0017] This utility model also provides an underground dump truck, which is equipped with the above-mentioned wire-controlled wet braking system.

[0018] This utility model offers at least the following advantages: The drive-by-wire wet braking system provided in this application employs a dual-valve parallel control system of a foot brake valve and an electro-hydraulic proportional valve to control the brake line. Even if the foot brake valve wears down, preventing the vehicle from braking normally, the electro-hydraulic proportional valve can be used to control the brake line for active braking, reducing vehicle safety hazards and ensuring driver safety. Furthermore, the addition of the electro-hydraulic proportional valve allows for direct control of braking and brake release via a controller, making it well-suited for autonomous vehicles and reducing the occurrence of accidental braking or forgetting to brake due to driver error.

[0019] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the oil circuit connection of the wire-controlled wet braking system described in an embodiment of this utility model;

[0021] Figure 2 This is a schematic diagram showing the connection between the wet brake assembly and the axle assembly according to an embodiment of the present invention;

[0022] Figure 3 for Figure 2 Schematic diagram of the cross section at point AA;

[0023] In the diagram: 1-First accumulator, 2-Low pressure alarm switch, 4-Filling valve, 5-High pressure filter, 6-Gear pump, 7-Fuel tank, 8-Temperature sensor, 9-Level sensor, 10-Radiator, 11-Overflow valve assembly, 12-Low pressure filter, 13-Left wet brake of front axle, 14-Left wet brake of middle axle, 15-Left wet brake of rear axle, 16-Right wet brake of rear axle, 17-Right wet brake of middle axle, 18-Right wet brake of front axle, 19-Brake pressure sensor, 20-Brake taillight switch, 21-Reverse shuttle valve, 22-Electro-hydraulic proportional valve, 23-Foot brake valve, 24-System pressure sensor, 25-Second accumulator, 26-Brake oil port, 27-Forced circulation inlet, 28-Forced circulation outlet, 29-Wet brake assembly, 30-Axle assembly. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0025] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this utility model, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] like Figure 1 As shown, this utility model provides a wire-controlled wet braking system, including: an oil tank 7, a gear pump 6, a filling valve 4, an accumulator, an electro-hydraulic proportional valve 22, a foot brake valve 23, a reverse shuttle valve 21, a brake pipeline, and multiple wet brakes. The oil inlet of the gear pump 6 is connected to the oil tank 7, the oil outlet of the gear pump 6 is connected to the oil inlet (P port) of the filling valve 4, the oil outlet (A1 port) of the filling valve 4 is connected to the accumulator, the control port (PB port) of the filling valve 4 is connected to the oil inlet (P port) of the electro-hydraulic proportional valve 22 and the foot brake valve 23 respectively, the oil outlet (B port) of the electro-hydraulic proportional valve 22 and the foot brake valve 23 are both connected to the oil inlet (A1 and A2 ports) of the reverse shuttle valve 21, the oil outlet (B port) of the reverse shuttle valve 21 is connected to the brake pipeline, and the brake pipeline is connected to the brake oil ports 26 of the multiple wet brakes respectively.

[0027] Specifically, the function of the filling valve 4 connected to the accumulator is to fill the accumulator with liquid. When the pressure is below the set lower limit, the filling valve 4 fills the accumulator with liquid. When the set upper limit pressure is reached, the filling valve 4 stops filling the accumulator with liquid, thus always keeping the pressure of the accumulator within a certain range to meet the requirements of the vehicle braking system. Inside the filling valve 4, there is a passage between the oil outlet (A1 port) and the control port (PB port) of the filling valve 4, allowing the hydraulic oil in the accumulator to enter the electro-hydraulic proportional valve 22 and the foot brake valve 23 through the filling valve 4.

[0028] The accumulator has a single inlet and outlet port. When the system oil pressure is higher than the accumulator's internal oil pressure, the accumulator stores oil; when the accumulator's internal pressure is higher than the system oil pressure, the accumulator releases oil. The filling valve 4 also has a return port (T port). A passage is provided between the filling valve 4's outlet port (A1 port) and its return port (T port). When the accumulator releases oil, excess hydraulic oil can return to the oil tank 7 through the filling valve 4.

[0029] like Figure 3As shown, the wet brake includes a brake oil port 26, a forced circulation oil inlet 27, and a forced circulation oil outlet 28. The brake oil port 26 is used for hydraulic oil pressure to enter and cause the wet brake to brake. The forced circulation oil inlet 27 and the forced circulation oil outlet 28 are used for the entry and discharge of cooling oil, respectively.

[0030] In the above embodiment, when the vehicle actively brakes, the foot brake valve 23 is pressed. At this time, hydraulic oil passes through the brake oil port 26 of the wet brake and enters the oil tank 7 through the reverse shuttle valve 21, and the wet brake participating in the braking performs braking.

[0031] When the vehicle is braked by wire, the electro-hydraulic proportional valve 22 switches, and the hydraulic oil enters the oil tank 7 through the brake oil port 26 of the wet brake and the reverse shuttle valve 21, and the wet brake that participates in braking performs braking.

[0032] When the vehicle releases the brakes, the hydraulic oil pressure from the accumulator passes through the foot brake valve 23 and the electro-hydraulic proportional valve 22, and enters the brake line through the reverse shuttle valve 21. The wet brake then releases the brake through the brake oil port 26 of the wet brake.

[0033] As can be seen from the above description, the drive-by-wire wet braking system provided in this application uses a foot brake valve 23 and an electro-hydraulic proportional valve 22 connected in parallel to control the brake line. Even if the foot brake valve 23 wears down and the vehicle cannot brake normally, the electro-hydraulic proportional valve 22 can be used to control the brake line for active braking, reducing vehicle safety hazards and ensuring driver safety. Furthermore, the addition of the electro-hydraulic proportional valve 22 allows for direct control of braking and brake release via a controller, making it well-suited for autonomous vehicles and reducing the occurrence of situations where the driver forgets to brake due to human error.

[0034] In another embodiment, the wire-controlled wet braking system further includes: a radiator 10 and an overflow valve assembly 11. The oil inlet of the radiator 10 is connected to the bypass port (O port) of the filling valve 4, the oil outlet of the radiator 10 is connected to the oil inlet of the overflow valve assembly 11, the oil outlet of the overflow valve assembly 11 is connected to the forced circulation oil inlets 27 of multiple wet brakes respectively, the oil return port of the overflow valve assembly 11 is connected to the oil tank 7, and the forced circulation oil outlets 28 of multiple wet brakes are all connected to the oil tank 7.

[0035] Specifically, a passage is provided between the oil inlet (P port) and the bypass port (O port) of the filling valve 4, so that the hydraulic oil in the oil tank 7 can enter the radiator 10 through the filling valve 4.

[0036] The oil inlet and outlet of the overflow valve assembly 11 can be the same port to simplify the structure of the overflow valve and reduce the complexity of manufacturing and installation.

[0037] In the above embodiment, when the accumulator is finished being filled, the oil inlet (P port) of the filling valve 4 is connected to its bypass port (O port). At this time, the hydraulic oil inside the oil tank 7 enters the radiator 10 through the filling valve 4. The radiator 10 cools down the high temperature hydraulic oil of the system. The cooled hydraulic oil enters multiple wet brakes through the overflow valve group 11. The high temperature generated by the brakes is carried away by forced circulation. Then the hydraulic oil returns to the oil tank 7, completing the cooling of the brakes.

[0038] When the radiator 10 is blocked or the wet brake forced circulation oil inlet and / or outlet is blocked, causing the pipeline pressure to rise, the oil inlet (P port) of the relief valve assembly 11 is connected to its oil return port (T port). After the hydraulic oil is cooled by the radiator 10, it directly enters the oil tank 7 through the relief valve assembly 11, ensuring the stability of the system pressure and preventing damage to various components due to high system pressure.

[0039] As can be seen from the above description, by setting up the radiator 10 and the overflow valve group 11, even if the frequent braking during normal vehicle operation causes the components and brake valves in the system to heat up severely, the cooling circuit composed of the radiator 10 and the overflow valve group 11 can dissipate heat, preventing the components and brake valves in the system from overheating due to frequent braking and causing brake failure and danger, thereby ensuring the stable performance of the braking system.

[0040] In another embodiment, the wire-controlled wet braking system further includes a system pressure sensor 24 and a brake pressure sensor 19. The filling valve 4 is also provided with a first detection port (PL port). The system pressure sensor 24 is located at the first detection port for detecting system pressure. The brake pipeline is provided with a second detection port. The brake pressure sensor 19 is located at the second detection port for detecting brake pressure.

[0041] In the above embodiments, the system pressure sensor 24 can be used to detect system pressure, and the brake pressure sensor 19 can be used to detect brake pressure. The data from the sensors can reflect the current status of the vehicle's braking system to the driver, so as to avoid the brake system malfunction going unnoticed.

[0042] In another embodiment, the filling valve 4 is further provided with a third detection port (SL port), and a low-pressure alarm switch 2 is provided at the third detection port. The low-pressure alarm switch is used to remind the driver that the parking brake release operation cannot be performed when the system pressure is lower than the set minimum release pressure. This embodiment allows the driver to accurately grasp the pressure status of the vehicle's braking system by setting a low-pressure alarm switch.

[0043] In another embodiment, a fourth detection port is also provided on the brake line, and a brake taillight switch 20 is provided at the fourth detection port. The brake taillight switch 20 is used to control the vehicle's brake taillights to alert other vehicles during vehicle braking. This embodiment, by providing the brake taillight switch 20, can release braking information to the outside world, avoid rear-end collisions, and improve vehicle driving safety.

[0044] In another embodiment, a high-pressure oil filter 5 is further provided between the oil tank 7 and the gear pump 6, and a low-pressure oil filter 12 is further provided between the forced circulation oil outlet 28 of the multiple wet brakes and the oil tank 7. The high-pressure oil filter 5 can prevent impurities in the oil tank 7 from entering the hydraulic pipeline and causing pipeline blockage, while the low-pressure oil filter 12 can filter out impurities carried out of the system by the hydraulic oil, preventing them from mixing into the oil tank 7 and ensuring the normal operation of the braking system.

[0045] In another embodiment, the oil tank 7 is further equipped with a temperature sensor 8 and a level sensor 9. The temperature sensor 8 can be used to measure the temperature of the hydraulic oil in the oil tank 7, and the level sensor 9 can be used to measure the amount of hydraulic oil in the oil tank 7. This embodiment, by setting the temperature sensor 8 and the level sensor 9, allows the driver to accurately monitor the temperature and amount of the hydraulic oil in the vehicle's braking system.

[0046] In another embodiment, at least one accumulator is provided, and all of the accumulators are connected to the oil outlet of the filling valve.

[0047] Specifically, the number of accumulators can be set according to the system pressure requirements. When multiple accumulators are used, they can be connected in series or in parallel. Of course, the process and assembly of series connection are simpler than those of parallel connection. For example, two accumulators can be connected in series, including a first accumulator 1 and a second accumulator 25, both of which are connected to the oil outlet of the filling valve 4. By setting two accumulators, the system pressure can be more stably maintained within the set range.

[0048] In another embodiment, the plurality of wet brakes include: a front axle left wet brake 13, a front axle right wet brake 18, a middle axle left wet brake 14, a middle axle right wet brake 17, a rear axle left wet brake 15, and a rear axle right wet brake 16.

[0049] The front axle left wet brake 13 and the front axle right wet brake 18 are connected in parallel to form a front axle brake group; the middle axle left wet brake 14 and the middle axle right wet brake 17 are connected in parallel to form a middle axle brake group; and the rear axle left wet brake 15 and the rear axle right wet brake 16 are connected in parallel to form a rear axle brake group. The front axle brake group is located upstream of the middle axle brake group, and the middle axle brake group is located upstream of the rear axle brake group.

[0050] like Figure 2As shown, the wet brake assembly 29 is generally installed on both sides of the axle assembly 30. Specifically, the front axle left wet brake 13 and the front axle right wet brake 18 are symmetrically installed on both sides of the front axle assembly, the middle axle left wet brake 14 and the middle axle right wet brake 17 are symmetrically installed on both sides of the middle axle assembly, and the rear axle left wet brake 15 and the rear axle right wet brake 16 are symmetrically installed on both sides of the rear axle assembly. The brake lines for connecting to the front axle left wet brake 13 and the front axle right wet brake 18 are also symmetrically distributed, as are the lines for connecting to the middle axle left wet brake 14 and the middle axle right wet brake 17, and the lines for connecting to the rear axle left wet brake 15 and the rear axle right wet brake 16.

[0051] In the above embodiments, by setting the front axle left wet brake 13, the front axle right wet brake 18, the middle axle left wet brake 14, the middle axle right wet brake 17, the rear axle left wet brake 15, and the rear axle right wet brake 16, and making the brakes and the pipelines connected to the brakes symmetrically distributed left and right, it is ensured that the oil pressure reaches the left and right wet brakes at the same time, preventing the risk of vehicle misalignment caused by asymmetrical pipeline distribution or deviation in length. At the same time, it ensures that the pipelines of the left and right wheels are aligned, thereby ensuring good consistency of vehicle braking response and also ensuring that the brake management layout is neat and convenient for process assembly.

[0052] This utility model also provides an underground dump truck, which is equipped with the above-mentioned wire-controlled wet braking system. Therefore, the underground dump truck has the same advantages as the wire-controlled wet braking system described in the above embodiments.

[0053] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A drive-by-wire wet braking system, characterized in that, include: The system includes an oil tank, a gear pump, a filling valve, an accumulator, an electro-hydraulic proportional valve, a foot brake valve, a reverse shuttle valve, brake lines, and multiple wet brakes. The oil inlet of the gear pump is connected to the oil tank, the oil outlet of the gear pump is connected to the oil inlet of the filling valve, the oil outlet of the filling valve is connected to the accumulator, the control port of the filling valve is connected to the oil inlets of the electro-hydraulic proportional valve and the foot brake valve, respectively, the oil outlets of the electro-hydraulic proportional valve and the foot brake valve are both connected to the oil inlet of the reverse shuttle valve, the oil outlet of the reverse shuttle valve is connected to the brake lines, and the brake lines are connected to the brake oil ports of the multiple wet brakes.

2. The steerable wet braking system as described in claim 1, characterized in that, Also includes: The system includes a radiator and an overflow valve assembly. The oil inlet of the radiator is connected to the bypass port of the filling valve, the oil outlet of the radiator is connected to the oil inlet of the overflow valve assembly, the oil outlet of the overflow valve assembly is connected to the forced circulation oil inlets of the plurality of wet brakes, the oil return port of the overflow valve assembly is connected to the oil tank, and the forced circulation oil outlets of the plurality of wet brakes are all connected to the oil tank.

3. The steerable wet braking system as described in claim 1, characterized in that, Also includes: The system includes a pressure sensor and a brake pressure sensor. The filling valve is also provided with a first detection port, and the system pressure sensor is located at the first detection port for detecting system pressure. A second detection port is provided on the brake pipeline, and the brake pressure sensor is located at the second detection port to detect the brake pressure.

4. The steerable wet braking system as described in claim 1, characterized in that, The filling valve is also equipped with a third detection port, and a low-pressure alarm switch for the vehicle is installed at the third detection port.

5. The steerable wet braking system as described in claim 1, characterized in that, The brake line is also equipped with a fourth detection port, and a brake taillight switch is installed at the fourth detection port.

6. The steerable wet braking system as described in claim 2, characterized in that, A high-pressure oil filter is also installed between the oil tank and the gear pump, and a low-pressure oil filter is also installed between the forced circulation oil outlet of the multiple wet brakes and the oil tank.

7. The steerable wet braking system as described in claim 1, characterized in that, The oil tank is also equipped with a temperature sensor and a liquid level sensor.

8. The steerable wet braking system as described in claim 1, characterized in that, At least one accumulator is provided, and all of the accumulators are connected to the oil outlet of the filling valve.

9. The steerable wet braking system as described in claim 1, characterized in that, The plurality of wet brakes include: front axle left wet brake, front axle right wet brake, middle axle left wet brake, middle axle right wet brake, rear axle left wet brake, and rear axle right wet brake. The front axle left wet brake and the front axle right wet brake are connected in parallel to form a front axle brake group. The middle axle left wet brake and the middle axle right wet brake are connected in parallel to form a middle axle brake group. The rear axle left wet brake and the rear axle right wet brake are connected in parallel to form a rear axle brake group. The front axle brake group is located upstream of the middle axle brake group, and the middle axle brake group is located upstream of the rear axle brake group.

10. An underground dump truck, characterized in that, The underground dump truck is equipped with a drive-by-wire wet braking system as described in any one of claims 1 to 9.

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