Auxiliary braking system and engineering machine

Abstract

The application provides an auxiliary braking system and engineering machinery, which are applied to the technical field of braking, and the auxiliary braking system comprises an energy accumulator, a brake valve, a brake cylinder, an electromagnetic valve and a shuttle valve; a first oil path, the energy accumulator is connected with the brake cylinder through the brake valve and the shuttle valve; a second oil path, the energy accumulator is connected with the brake cylinder through the electromagnetic valve and the shuttle valve; when the brake valve fails, the electromagnetic valve is opened, and auxiliary braking is performed through the second oil path. Through the auxiliary braking system, when service braking is normal, braking is performed through the brake valve. When the brake valve fails, braking is performed through the second oil path of the electromagnetic valve.

Description

Technical Field

[0001] This application relates to the field of braking technology, and more particularly to an auxiliary braking system and engineering machinery. Background Technology

[0002] Graders are large construction machinery commonly used in road construction, mining, and other engineering projects. The braking system of a grader typically includes both service brakes and parking brakes. The service brake controls the rear axle brakes through components such as the brake pedal, brake valve, and accumulator, enabling the vehicle to decelerate and stop during operation. The parking brake, on the other hand, ensures the stability of the grader when stationary, effectively preventing it from slipping or rolling.

[0003] When the service brake fails during vehicle operation, the parking brake can be used as an auxiliary braking method. However, in emergency situations, the parking brake (i.e., handbrake) has limited braking force as an auxiliary braking force, poor braking effect, and cannot meet the user's safety needs.

[0004] Therefore, improving the braking effect of the parking brake when the service brake fails is an urgent problem to be solved. Utility Model Content

[0005] This application provides an auxiliary braking system and engineering machinery, which can improve the braking effect of the parking brake when the service brake fails.

[0006] In a first aspect, this application provides an auxiliary braking system, comprising: an accumulator, a brake valve, a brake cylinder, a solenoid valve, and a shuttle valve;

[0007] The first oil circuit connects the accumulator to the brake cylinder via the brake valve and the shuttle valve.

[0008] The second oil circuit connects the accumulator to the brake cylinder via the solenoid valve and the shuttle valve.

[0009] When the brake valve malfunctions, the solenoid valve opens, and auxiliary braking is achieved through the second oil circuit.

[0010] Optionally, the shuttle valve is a two-way shuttle valve.

[0011] Optionally, a pressure reducing valve is provided between the solenoid valve and the shuttle valve.

[0012] Optionally, the auxiliary braking system further includes an emergency braking button connected to the solenoid valve. When the emergency braking button is pressed, the solenoid valve opens.

[0013] Optionally, the brake valve is connected to an electronically controlled sensor, which is used to detect the state of the brake valve.

[0014] Optionally, the auxiliary braking system may also include a hydraulic oil tank, a double gear pump, a filter, an overflow valve, and a filling valve;

[0015] The dual gear pump delivers oil from the hydraulic tank through the filter and the overflow valve to the brake valve in one path, and through the filling valve to the accumulator in the other path.

[0016] Optionally, the solenoid valve is connected to a controller, which controls the opening or closing of the solenoid valve.

[0017] Optionally, the auxiliary braking system further includes a handbrake switch sensor, which is connected to the controller and is used to detect the activation state of the handbrake.

[0018] Optionally, the auxiliary braking system further includes a speed sensor connected to the controller, the speed sensor being used to detect the vehicle's speed.

[0019] In a second aspect, this application provides a piece of construction machinery, which includes an auxiliary braking system as described in any of the first aspects.

[0020] This application provides an auxiliary braking system and engineering machinery. The auxiliary braking system includes an accumulator, a brake valve, a brake cylinder, a solenoid valve, and a shuttle valve. A first hydraulic circuit connects the accumulator to the brake cylinder via the brake valve and shuttle valve. A second hydraulic circuit connects the accumulator to the brake cylinder via the solenoid valve and shuttle valve. In the event of a brake valve malfunction, the solenoid valve opens, providing auxiliary braking through the second hydraulic circuit. With this auxiliary braking system, braking is performed through the brake valve when the service brake is functioning normally. In some scenarios, if the brake valve malfunctions, braking is performed through the second hydraulic circuit of the solenoid valve. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0022] Figure 1 A schematic diagram of an auxiliary braking system provided in this application;

[0023] Figure 2 A schematic diagram of an auxiliary braking system provided in this application Figure 2 ;

[0024] Figure 3 A schematic diagram of an auxiliary braking system provided in this application Figure 3 ;

[0025] Figure 4A schematic diagram of an auxiliary braking system provided in this application Figure 4 .

[0026] Explanation of reference numerals in the attached figures:

[0027] 1-Accumulator; 2-Brake valve; 3-Brake cylinder; 4-Solenoid valve; 5-Shuttle valve; 6-Pressure reducing valve; 7-Hydraulic oil tank; 8-Double gear pump; 9-Filter; 10-Relief valve; 11-Filling valve; 12-Controller; 13-Handbrake switch sensor; 14-Speed ​​sensor.

[0028] The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0029] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0030] Common braking configurations in the hydraulic systems of motor graders:

[0031] Service brakes: brake pedal + brake valve + accumulator + brake assembly (rear axle), mainly achieved by controlling the rear axle brakes.

[0032] Parking brake (ordinary handbrake): Handbrake (operating mechanism) + handbrake cable + brake drum (transmission drum brake). When parking, braking is achieved by controlling the transmission brake drum via a steel cable.

[0033] The primary function of the parking brake is to ensure the stability of the grader when it is stationary, effectively preventing the vehicle from accidentally sliding or rolling. In emergencies, the parking brake can also be used as an auxiliary braking method, in conjunction with the service brake, to improve braking performance. For example, if the user cannot stop the vehicle by pressing the brake pedal while it is in motion, the user can use the parking brake (handbrake) to apply the brakes. However, the parking brake's braking force is insufficient, resulting in poor braking performance.

[0034] In view of this, this application proposes an auxiliary braking system that can assist the parking brake system in braking the moving construction machinery when the service brake fails, thereby improving the braking effect.

[0035] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0036] Figure 1 A schematic diagram of an auxiliary braking system provided in this application is shown below. Figure 1 As shown, it includes: accumulator 1, brake valve 2, brake cylinder 3, solenoid valve 4, and shuttle valve 5;

[0037] The first oil circuit connects the accumulator 1 to the brake cylinder 3 via the brake valve 2 and the shuttle valve 5.

[0038] The second oil circuit connects the accumulator 1 to the brake cylinder 3 via the solenoid valve 4 and the shuttle valve 5.

[0039] When brake valve 2 malfunctions, solenoid valve 4 opens, assisting braking through the second oil circuit.

[0040] In some scenarios, if brake valve 2 malfunctions (e.g., internal blockage or jamming), the user cannot brake by pressing the brake pedal, meaning the first hydraulic circuit cannot drive the brake cylinder. In this case, solenoid valve 4 is opened to drive brake cylinder 3 through the second hydraulic circuit for auxiliary braking.

[0041] In some scenarios, the vehicle is in the parking brake position, but the vehicle is still rolling or moving. In this case, the solenoid valve 4 is opened to push the brake cylinder 3 through the second oil circuit to perform auxiliary braking.

[0042] In some embodiments, an emergency brake button can be provided. When the user finds that the brake pedal cannot brake, he can press the emergency brake button to open the solenoid valve 4.

[0043] Two oil circuits are connected to the brake cylinder via shuttle valve 5. Shuttle valve 5 has two oil inlets and a sliding valve core inside. The movement of the valve core is controlled by the pressure difference between the two sides. When the pressures on both sides are different, the valve core is pushed to the side with higher pressure, thereby closing the oil circuit on the other side and ensuring that the hydraulic fluid flows to the side with higher pressure. When brake valve 2 in the first oil circuit fails, the pressure in the first oil circuit is low. After the second oil circuit of solenoid valve 4 opens, the shuttle valve will guide the fluid to the side of the second oil circuit with higher pressure.

[0044] In some embodiments, the shuttle valve can be a bidirectional shuttle valve with two ports, allowing fluid to flow in two directions. The shuttle valve can also be an electrically controlled shuttle valve, where the liquid flow direction is controlled by an electrical signal. The shuttle valve can also be a slider shuttle valve.

[0045] When the first oil circuit is working normally, the shuttle valve can also prevent accidental activation, such as accidental triggering of the second oil circuit. However, the pressure in the first oil circuit is greater than that in the second oil circuit, so the service brake can still be operated normally.

[0046] The shuttle valve's oil circuit design makes the switching between driving and auxiliary braking lines more flexible and precise, avoiding oil circuit interference problems, ensuring that the system can switch efficiently under different operating conditions, and improving the system's response speed and stability.

[0047] The main function of the first oil circuit is to use the pressurized oil stored in the accumulator 1 to provide power to the brake cylinder 3 through the cooperation of the brake valve 2 and the shuttle valve 5, so as to perform the braking operation.

[0048] When the vehicle needs to brake, the user presses the pedal, and the hydraulic oil in the first hydraulic circuit flows to the brake cylinder, pushing the brake cylinder to act on the braking system, thereby achieving braking of the vehicle. This hydraulic circuit is commonly used for normal service braking operations.

[0049] The main function of the second hydraulic circuit is to provide a backup hydraulic oil source. When the first hydraulic circuit fails to work properly or additional braking is required, the second hydraulic circuit can provide backup pressure support to ensure the reliability and redundancy of the braking system.

[0050] The second hydraulic circuit can be activated when the system malfunctions or additional braking is required, providing a backup hydraulic supply to ensure that the braking system can continue to operate effectively and to prevent brake failure due to a failure of the main hydraulic circuit.

[0051] In some embodiments, the brake valve is connected to an electronically controlled sensor, which detects the state of the brake valve to open the solenoid valve 4. The electronically controlled sensor can be a position sensor, detecting the position of the brake valve spool to ensure it has reached the predetermined position. The position sensor is directly connected to the brake valve spool or seat. The movement of the spool is monitored by the sensor's sensor element, which provides real-time feedback on spool position changes. If the spool does not move to the predetermined position (e.g., due to mechanical jamming or blockage), the sensor detects the anomaly and sends a signal to the control system. The electronically controlled sensor can also be a flow sensor, detecting whether the oil flow through the brake valve is normal.

[0052] The accumulator and solenoid valve series design effectively utilizes the hydraulic oil source of the service brakes without requiring an additional oil supply. This simplifies system design, reduces the complexity of the oil source and piping, and consequently lowers the overall system cost.

[0053] In one specific scenario, the brake pedal fails while the vehicle is in motion, forcing the user to use the handbrake. Alternatively, after applying the handbrake, the vehicle may roll backwards on a slope at a certain speed. In both scenarios, the braking force of the handbrake is insufficient, resulting in a short braking distance.

[0054] When the driver pulls the handbrake lever, the operating mechanism tightens the steel cable of the handbrake cable. The cable transmits tension, controlling the movement of the brake drum. When the handbrake cable tightens, the brake drum in the transmission begins to operate. The brake drum is typically made of friction material (such as brake pads) in contact with its surface. The friction material inside the brake drum contacts the drum wall, generating friction, which in turn achieves a braking effect. At this time, the braking system uses friction to hold the vehicle in place, preventing it from slipping. Once the brake drum contacts the friction material and generates sufficient friction, the vehicle is fixed, the handbrake locks, and the vehicle does not move when parked. However, if the vehicle has a certain speed (e.g., greater than 5 km / h), the solenoid valve needs to be activated to apply hydraulic braking through a second hydraulic circuit, assisting the mechanical braking of the handbrake.

[0055] Figure 2 A schematic diagram of an auxiliary braking system provided in this application Figure 2 ,like Figure 2 As shown, a pressure reducing valve 6 is installed between the solenoid valve and the shuttle valve. The main function of the pressure reducing valve 6 is to limit the pressure entering the shuttle valve, ensuring that the pressure in the shuttle valve does not exceed the set safety value. The pressure reducing valve can regulate the pressure of the hydraulic oil, preventing damage to the shuttle valve or other components due to excessive pressure, and protecting the normal operation of the entire hydraulic system.

[0056] The addition of a pressure-reducing valve allows the system to automatically adjust when the pressure is too high, preventing damage to the brake cylinder from excessive pressure. The pressure-reducing valve can be set to a suitable pressure range to ensure safe system operation, and the pressure value can be adjusted according to actual needs, improving the system's flexibility and adaptability.

[0057] Figure 3 A schematic diagram of an auxiliary braking system provided in this application Figure 3 ,like Figure 3 As shown, the auxiliary braking system also includes a hydraulic oil tank 7, a double gear pump 8, a filter 9, an overflow valve 10, and a filling valve 11.

[0058] The dual gear pump 8 divides the oil from the hydraulic tank 7 into two paths after passing through the filter 9 and the overflow valve 10. One path is delivered to the brake valve 2, and the other path is delivered to the accumulator 1 through the filling valve 11.

[0059] The hydraulic oil tank 7 stores hydraulic oil and provides the necessary oil source to supply the entire hydraulic system, providing hydraulic oil to the double gear pump 8.

[0060] The double gear pump 8 is used to draw hydraulic fluid from the hydraulic tank, pressurize it, and deliver the fluid to different components of the system.

[0061] Filter 9 is used to clean the hydraulic oil, removing impurities and contaminants to ensure that the hydraulic oil does not damage or affect the normal operation of the system before entering other system components.

[0062] The relief valve 10 is a pressure regulating device that protects the system from overpressure. A maximum pressure value is set in the relief valve 10. When the system pressure exceeds this value, the relief valve automatically opens, allowing excess hydraulic oil to flow back through the valve, thereby maintaining the normal operating pressure of the system.

[0063] The function of the filling valve 11 is to control the flow of hydraulic oil into the accumulator 1. When the accumulator needs to be filled, the filling valve opens, allowing hydraulic oil to flow into the accumulator to ensure that the accumulator can store the required pressure oil.

[0064] The coordinated operation of multiple components ensures the system's efficiency, security, and stability.

[0065] Figure 4 A schematic diagram of an auxiliary braking system provided in this application Figure 4 ,like Figure 4 As shown, solenoid valve 4 is connected to controller 12, which is used to control the opening or closing of solenoid valve.

[0066] In some embodiments, the auxiliary braking system further includes a handbrake switch sensor 13, which is connected to the controller 12 and is used to detect the activation state of the handbrake. In some embodiments, the solenoid valve 4 is opened only when the handbrake sensor detects that the handbrake is in an active state.

[0067] In some embodiments, the auxiliary braking system further includes a speed sensor 14 connected to the controller 12, which is used to detect the vehicle's speed. In some embodiments, the solenoid valve is only opened when the handbrake is activated and the device has a certain speed. When the handbrake is engaged and has a certain speed, it may indicate a failure of the service brakes or a situation where the vehicle rolls away from its stop. The auxiliary braking system can assist in braking and improve the braking effect.

[0068] In any of the above embodiments, the solenoid valve can be replaced with an electro-hydraulic proportional valve to achieve linear control of the braking pressure. For example, the electromagnet inside the valve drives the valve core to move over time to gradually increase the flow rate of the system.

[0069] In some embodiments, the second hydraulic circuit can use a separate accumulator. The second hydraulic circuit, via a separate accumulator, can operate independently of the first hydraulic circuit. This effectively avoids hydraulic circuit interference and improves the system's accuracy and reliability. The accumulator used in the second hydraulic circuit is for emergency use; therefore, its capacity and pressure can be preset to ensure sufficient braking force is provided during emergency auxiliary braking.

[0070] This application also provides a type of construction machinery, which may be a road roller, grader, excavator, new energy vehicle, etc., and the construction machinery includes the auxiliary braking system as described in any of the above embodiments.

[0071] Finally, it should be noted that other embodiments of this application will readily conceive of by those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and alterations may be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. An auxiliary braking system characterized by, include: Accumulators, brake valves, brake cylinders, solenoid valves, and shuttle valves; The first oil circuit connects the accumulator to the brake cylinder via the brake valve and the shuttle valve. The second oil circuit connects the accumulator to the brake cylinder via the solenoid valve and the shuttle valve. When the brake valve malfunctions, the solenoid valve opens, and auxiliary braking is achieved through the second oil circuit.

2. The auxiliary braking system of claim 1, wherein, The shuttle valve is a two-way shuttle valve.

3. The supplemental braking system of claim 1, wherein, A pressure reducing valve is provided between the solenoid valve and the shuttle valve.

4. The supplemental braking system of claim 1, wherein, The auxiliary braking system also includes an emergency braking button, which is connected to the solenoid valve. When the emergency braking button is pressed, the solenoid valve opens.

5. An auxiliary braking system according to any one of claims 1 to 4, characterised in that, The brake valve is connected to an electronically controlled sensor, which is used to detect the state of the brake valve.

6. An auxiliary braking system according to any one of claims 1 to 4, characterised in that, The auxiliary braking system also includes a hydraulic oil tank, a double gear pump, a filter, an overflow valve, and a filling valve; The dual gear pump delivers oil from the hydraulic tank through the filter and the overflow valve to the brake valve in one path, and through the filling valve to the accumulator in the other path.

7. An auxiliary braking system according to any one of claims 1 to 4, characterised in that, The solenoid valve is connected to a controller, which is used to control the opening or closing of the solenoid valve.

8. The supplemental braking system of claim 7, wherein, The auxiliary braking system also includes a handbrake switch sensor, which is connected to the controller and is used to detect the activation state of the handbrake.

9. The supplemental braking system of claim 8, wherein, The auxiliary braking system also includes a speed sensor connected to the controller, which is used to detect the vehicle's speed.

10. A working machine, characterized in that The construction machinery includes the auxiliary braking system as described in any one of claims 1-9.

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