Loader braking system

Abstract

The utility model discloses a loader braking system, and belongs to the technical field of engineering machinery. The loading machine braking system overcomes the defect that in the prior art, due to the failure of a traditional loading machine braking system, vehicle braking cannot be achieved even if a brake is stepped down. The main structure of the device comprises an air storage assembly, an air outlet of the air storage assembly is connected with an electric control brake valve and an air brake valve, the electric control signal end of the electric control brake valve is connected with an electric control pedal through a controller, and air outlets of the electric control brake valve and the air brake valve are connected with air inlets in the two ends of a pressure selection assembly respectively. An air outlet of the pressure selection assembly is connected with the rear axle brake caliper and the front axle brake caliper through the booster pump. The utility model is mainly applied to engineering machinery such as loaders and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to engineering machinery technical field, concretely speaking, especially relate to a loader braking system. BACKGROUND

[0002] The braking system is the key component for the safe operation of engineering machinery, and its design is directly related to the safety and operating performance of the vehicle. At present, the braking system of the loader mainly adopts the air pressure braking technology, and each component of the service braking system includes a brake pedal, an air pressure brake and an air tank, etc. During the driving of the vehicle, the driver steps on the brake pedal to realize the deceleration or stop of the vehicle through the service braking system.

[0003] The braking system in the prior art is an independent system, as shown in the figure, which has certain limitations. If the vehicle speed is too fast or the driver fails to step on the brake in time under the tense situation, or the braking system itself fails to realize the braking of the vehicle even if the brake is stepped on, a serious safety accident may be caused. Therefore, it is urgent to improve the existing braking system to solve the above problems and improve the safety and reliability of the vehicle. Figure 2 UTILITY MODEL CONTENTS

[0004] The utility model solves the technical problem of overcoming the deficiency of the prior art and provides a loader braking system.

[0005] In order to realize the above-mentioned purpose, the utility model is realized by adopting the following technical scheme:

[0006] A loader braking system, comprising a gas storage assembly, the gas outlets of the gas storage assembly are respectively connected with an electric control brake valve and an air brake valve, the electric control signal end of the electric control brake valve is connected with an electric control pedal through a controller, the gas outlets of the electric control brake valve and the air brake valve are respectively connected with the two end gas inlets of a pressure selection assembly, and the gas outlet of the pressure selection assembly is respectively connected with a rear axle brake caliper and a front axle brake caliper through a force booster.

[0007] Preferably, an electric control pedal angle sensor is arranged on the electric control pedal, the controller acquires the electric signal to control the opening and closing size of the electric control brake valve through the electric control pedal angle sensor, compares the outlet pressure of the electric control brake valve and the air brake valve through the pressure selection assembly, selects the larger one to transmit the pressure to the force booster, and realizes the braking.

[0008] Preferably, the gas storage assembly comprises a gas tank, an oil-water separator combination valve and an air compressor which are connected in series.

[0009] Preferably, the gas tank is further connected with a gas pressure gauge and a safety valve.

[0010] Preferably, the pressure selection assembly is a shuttle valve.​

[0011] Preferably, both the electrically controlled braking valve and the shuttle valve are installed on the rear axle braking actuator side.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. When the loader needs to brake, it can be braked by pressing the left brake, the right brake, or both brakes simultaneously. If both brakes are pressed simultaneously, the shuttle valve compares the outlet pressures of the electric brake valve and the air brake valve, and selects the greater pressure to transmit to the booster pump, thereby achieving the braking effect. Through the setting of the electric brake valve and the air brake valve, combined with the connection between the controller and the electric pedal, precise control of the braking process is achieved. The electric pedal angle sensor can provide real-time feedback of the pedal position information to the controller, so that the braking pressure can be precisely adjusted according to the driver's intention, thereby improving the response speed and linearity of the braking force of the braking system.

[0014] 2. By placing the electronically controlled braking valve and shuttle valve near the rear axle braking actuator, the rear axle brakes first during braking, preventing the vehicle from braking the front axle first and causing the vehicle to tilt forward. This improves braking response and vehicle stability, thereby enhancing the safety performance of the construction machinery and the driver's driving comfort.

[0015] 3. The introduction of the pressure selection component ensures that the greater pressure generated by either electric braking or air braking can be selected and transmitted to the booster pump. This ensures that sufficient braking force can be provided under any circumstances, while avoiding the situation where the braking system itself fails and the vehicle cannot be braked even when the brake is applied, thus further enhancing the safety and reliability of braking.

[0016] 4. The series connection of the air storage tank, oil-water separator combination valve and air compressor in the air storage component not only ensures a stable gas supply, but also extends the service life of the entire hydraulic system through oil-water separation and reduces the risk of failure caused by oil-water mixture.

[0017] 5. The design of the electronically controlled pedal allows for more precise adjustment of braking intensity, enabling drivers to easily achieve ideal deceleration or stopping effects under different road conditions, while reducing fatigue during long-distance driving;

[0018] 6. The air tank is equipped with a pressure gauge and a safety valve, which can visually monitor the air pressure in the system and automatically release pressure in case of overpressure, protecting the entire hydraulic system from damage caused by excessive pressure;

[0019] In summary, the utility model discloses a redundant brake system and the arrangement element position are added to improve the response speed of brake system, and then reduce the risk of safety accident caused by brake system problem, ensure the safety of vehicle and the driver, and the introduction of electric control pedal, controller and electric control brake valve can provide technical support for subsequent research unmanned system, realize remote brake control. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the system diagram of the utility model;

[0021] Figure 2 It is the brake system diagram in prior art.

[0022] In the drawing: 1, electric control pedal;2, controller;3, electric control brake valve;4, shuttle valve;5, air brake valve;6, force pump;7, rear axle brake caliper;8, air tank;9, oil-water separator combination valve;10, air compressor;11, air pressure gauge;12, safety valve;13, front axle brake caliper. DETAILED DESCRIPTION

[0023] The utility model will be further described below through specific embodiment and combining with the drawings.

[0024] Example 1:

[0025] As Figure 1 Indicated, a loader brake system includes air storage assembly, and the air outlet of air storage assembly is connected with electric control brake valve 3 and air brake valve 5 respectively, and electric control brake valve 3 and air brake valve 5 are connected in parallel, and the electric control signal end of electric control brake valve 3 is connected with electric control pedal 1 through controller 2, specifically, electric control pedal 1 is connected with controller 2 by electric signal, and the control signal of controller 2 is connected to electric control brake valve 3;The air outlet of electric control brake valve 3 and air brake valve 5 is connected with the air inlet of both ends of pressure selection assembly respectively, and the air outlet of pressure selection assembly is connected with rear axle brake caliper 7 and front axle brake caliper 13 through force pump 6 respectively.

[0026] In the embodiment, to avoid brake system failure to cause even if stepping on the brake also cannot realize vehicle braking, by increasing electric control pedal 1, pressure selection assembly and pipeline, thereby realizing double pedal brake, and comparing the pressure of electric control brake valve 3 pressure and mechanical air brake valve 5 end pressure through pressure selection assembly, and then making brake response in time.

[0027] Example 2:

[0028] A loader brake system, different from the embodiment 1, is characterized in that an electric control pedal angle sensor is arranged on the electric control pedal 1, the controller 2 obtains an electric signal to control the opening and closing size of the electric control brake valve 3 through the electric control pedal angle sensor, and the pressure selection assembly compares the outlet pressure of the electric control brake valve 3 and the air brake valve 5, selects the larger one, and transmits the pressure to the force pump 6 to realize braking; at the same time, the introduction of the electric control pedal 1, the controller 2 and the electric control brake valve 3 can provide technical support for subsequent research on unmanned system and realize remote brake control.

[0029] Further, the air storage assembly comprises the air storage tank 8, the oil-water separator combined valve 9 and the air compressor 10 connected in sequence.

[0030] Further, the pressure selection assembly is a shuttle valve 4, and the electric control brake valve 3 and the shuttle valve 4 are both installed on the side of the rear axle brake execution end, so that the rear axle brake is first performed when braking, the vehicle is prevented from tilting forward due to the front axle brake, the brake response and the vehicle stability are improved, and the safety performance of the engineering machinery and the driving comfort of the driver are improved.

[0031] The working principle of the utility model is as follows:

[0032] The compressed air generated by the air compressor 10 passes through the oil-water separator combined valve 9 to remove the oil and water contained in the compressed air, so as to ensure that the gas entering the brake system is clean and dry, and then the gas is sent to the air storage tank 8, the air pressure gauge 11 on the air storage tank 8 displays the current air pressure state, and the safety valve 12 is automatically opened when the air pressure exceeds the safety range to prevent overpressure;

[0033] When the driver steps on the electric control pedal 1, the electric control pedal angle sensor installed thereon detects the angle change of the pedal and sends the corresponding electric signal to the controller 2, the controller 2 calculates the required braking force according to the received signal and sends an instruction to the electric control brake valve 3 to adjust the valve opening and closing degree, so as to control the gas flow and pressure from the air storage tank 8 to the electric control brake valve 3.

[0034] When the brakes on both sides are stepped on to brake, the electric control brake valve 3 and the air brake valve 5 respectively receive the gas from the gas storage tank 8, the gas outlets of the two valves are connected to the shuttle valve 4, the function of the shuttle valve 4 is to compare the pressure output by the electric control brake valve 3 and the air brake valve 5, then select the larger pressure value to pass to the subsequent force pump 6, after the force pump 6 receives the maximum pressure from the shuttle valve 4, it further amplifies this pressure and distributes it to the rear axle brake caliper 7 and the front axle brake caliper 13; finally, the front axle brake caliper 13 and the rear axle brake caliper 7 receive the high-pressure gas provided by the force pump 6, and then clamp the brake pads in the brake disc or drum brake by mechanical means, achieving the action of deceleration or stopping of the vehicle.

[0035] In summary, the working principle of the loader brake hydraulic system combines electronic control system and traditional air brake technology, when the loader needs to brake, it can brake by stepping on the left brake, or stepping on the right brake, or stepping on both brakes, not only improving the braking efficiency and response speed, but also enhancing the stability and durability of the whole system.

Claims

1. A loader brake system comprising an air reservoir assembly, characterized by: The air outlet of the air storage assembly is connected with an electric brake valve (3) and an air brake valve (5) respectively, the electric control signal end of the electric brake valve (3) is connected with an electric control pedal (1) through a controller (2), the air outlets of the electric brake valve (3) and the air brake valve (5) are connected with the air inlets of two ends of a pressure selection assembly respectively, and the air outlet of the pressure selection assembly is connected with a rear axle brake caliper (7) and a front axle brake caliper (13) through a force booster pump (6).

2. The loader brake system of claim 1, characterized in that: An electric control pedal angle sensor is arranged on the electric control pedal (1), the controller (2) obtains an electric signal through the electric control pedal angle sensor to control the opening and closing size of the electric brake valve (3), and the outlet pressure of the electric brake valve (3) and the air brake valve (5) is compared through the pressure selection assembly, the pressure selection assembly selects the greater one to transmit the pressure to the force booster pump (6), and realizes braking.

3. The loader brake system of claim 1, wherein: The air storage assembly comprises an air storage tank (8), an oil-water separator combined valve (9) and an air compressor (10) connected in sequence.

4. The loader brake system of claim 3, characterized in that: The air storage tank (8) is further connected with an air pressure gauge (11) and a safety valve (12).

5. The loader brake system of any of claims 1-4, wherein: The pressure selection assembly is a shuttle valve (4).

6. The loader brake system of claim 5, characterized in that: The electric brake valve (3) and the shuttle valve (4) are both installed on one side of a rear axle brake execution end.

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