Hydraulic transmission system for snow removing roller brush of new energy vehicle

Abstract

The utility model belongs to the technical field of transmission equipment, concretely relates to a kind of for new energy vehicle snow removal roller brush hydraulic transmission system;Including hydraulic transmission system and oil supplement system, the hydraulic transmission system includes main pump drive motor, quantitative plunger hydraulic pump, main overflow valve, flush valve and roller brush hydraulic motor;Main pump drive motor drives quantitative plunger hydraulic pump, quantitative plunger hydraulic pump and roller brush hydraulic motor are connected by high-pressure pipeline and low-pressure pipeline and are driven, main overflow valve and flush valve are also connected in parallel between high-pressure pipeline and low-pressure pipeline, flush valve backflow is communicated with oil tank;The oil supplement system includes oil supplement pump, oil supplement overflow valve and oil supplement pump drive motor;Oil supplement pump drive motor drives oil supplement pump, one end of oil supplement pump is communicated with oil tank, other end is communicated with low-pressure pipeline, and oil supplement overflow valve is arranged between low-pressure pipeline and oil supplement pump.The utility model can greatly reduce the space required for installation, improve hydraulic transmission efficiency, reduce energy consumption, and have wide adaptation range.

Description

Technical Field

[0001] This utility model belongs to the field of transmission equipment technology, specifically relating to a hydraulic transmission system for snow removal roller brushes in new energy vehicles. Background Technology

[0002] Hydraulic snow removal brushes are typically mounted on traditional gasoline-powered vehicles via a power take-off (PTO). However, most new energy vehicles are now purely electric. Directly mounting hydraulically driven snow removal brushes on these vehicles results in a large size, low efficiency, and difficulty in obtaining power, failing to fully utilize the advantages of new energy vehicles. Meanwhile, purely electric motor-driven brushes present safety concerns and are still in the exploratory stage. Therefore, it is necessary to develop a hydraulic transmission solution specifically for snow removal brushes in new energy vehicles, combining the advantages of both electric and hydraulic systems. Utility Model Content

[0003] The purpose of this utility model is to solve the problems existing in the above-mentioned background technology and provide a hydraulic transmission system for snow removal roller brushes in new energy vehicles, which can greatly reduce the space required for installation, improve hydraulic transmission efficiency, reduce energy consumption, and has a wide range of applications.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: a hydraulic transmission system for a snow removal roller brush in a new energy vehicle, comprising a hydraulic transmission system and an oil replenishment system. The hydraulic transmission system includes a main pump drive motor, a fixed displacement piston hydraulic pump, a main relief valve, a flushing valve, and a roller brush hydraulic motor. The main pump drive motor drives the fixed displacement piston hydraulic pump to provide a power source for the hydraulic system. The fixed displacement piston hydraulic pump and the roller brush hydraulic motor are connected and driven by high-pressure and low-pressure pipelines. A main relief valve and a flushing valve are also connected in parallel between the high-pressure and low-pressure pipelines. The flushing valve's return flow is connected to the oil tank. The oil replenishment system includes an oil replenishment pump, an oil replenishment relief valve, and an oil replenishment pump drive motor. The oil replenishment pump drive motor drives the oil replenishment pump to provide a power source for the oil replenishment system. One end of the oil replenishment pump is connected to the oil tank, and the other end is connected to the low-pressure pipeline, replenishing the hydraulic oil in the oil tank to the low-pressure pipeline. The oil replenishment relief valve is located between the low-pressure pipeline and the oil replenishment pump, and the return flow of the oil replenishment relief valve is connected to the oil tank.

[0005] Furthermore, the main pump drive motor is a permanent magnet synchronous motor.

[0006] Furthermore, the quantitative plunger hydraulic pump is a quantitative plunger pump.

[0007] Furthermore, the main relief valve is a pilot-operated relief valve used to limit the pressure of the hydraulic system.

[0008] Furthermore, the oil replenishment pump is a gear oil pump.

[0009] Furthermore, the oil replenishment relief valve is a standard direct-acting relief valve, and a replenishment pressure of 2-3 MPa can be set according to system requirements. Furthermore, the oil replenishment pump drive motor is a low-power motor that drives the oil replenishment pump at a constant speed.

[0010] The beneficial effects of this utility model are: 1) This utility model, through the design of a closed hydraulic system, can greatly reduce the space required for installation and improve the efficiency of hydraulic transmission compared with traditional hydraulic transmission. In addition, the valve switching is eliminated, and the fixed displacement piston pump and hydraulic motor are directly connected, which can effectively reduce system heat generation. Furthermore, since it is an electrically driven control pump, the output torque and speed can be monitored to adjust the output strategy of the drive motor in a timely manner, control the speed of the roller brush to match the current snow removal needs, quickly respond to the driver's operation, and reduce energy consumption. Compared with the closed hydraulic system composed of traditional variable pumps, the cost is lower and can reach or exceed the closed hydraulic system of transmission variable pumps. It can be easily adapted to a large number of new energy vehicles on the market, with a wide range of applications and certain practical and promotional value. Attached Figure Description

[0011] Figure 1 This is a connection diagram of the present invention.

[0012] In the diagram: 1. Main pump drive motor; 2. Fixed displacement plunger hydraulic pump; 3. Main relief valve; 4. Flushing valve; 5. Roller brush hydraulic motor; 6. Oil replenishment pump; 7. Oil replenishment relief valve; 8. Oil replenishment pump drive motor; 9. Oil tank. Detailed Implementation

[0013] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0014] Example: Figure 1 As shown, the present invention discloses a hydraulic transmission system for a snow removal roller brush in a new energy vehicle. The hydraulic system mainly consists of a main pump drive motor 1 connected to a fixed-displacement plunger hydraulic pump 2 and a replenishing pump 6, forming a closed-loop hydraulic drive system. The main pump drive motor 1 controls the A and B ports of the fixed-displacement plunger hydraulic pump 2 via an electrical system, directly connecting them to the A and B ports of the roller brush hydraulic motor 5. The fixed-displacement plunger hydraulic pump 2 is connected in parallel with a flushing valve 4, which discharges low-pressure side oil at a certain ratio, returning it to the oil tank 9 via the radiator for system cooling. The replenishing pump drive motor 8 is connected to the replenishing pump 6, and the high-pressure port of the replenishing pump 6 is connected to the low-pressure side of the main circuit, replenishing the hydraulic system to compensate for internal leakage in hydraulic components and the flushing flow of the flushing valve 4. A main relief valve 3 is provided between the A and B ports of the fixed-displacement plunger hydraulic pump 2, with the relief port connected to the B port of the system (low-pressure side), to protect the hydraulic system from high-pressure damage and limit the maximum power of the entire drive system, while also protecting the main pump drive motor 1. Meanwhile, one-way valves are connected in parallel on both sides of the hydraulic motor 5 of the roller brush to prevent cavitation.

[0015] In the oil replenishment system, the oil replenishment pump 6 is driven by a separate small motor. The high-pressure port of the oil replenishment overflow valve 7 is connected to the high-pressure port of the oil replenishment pump 6, and the overflow port is connected to the oil tank 9 to maintain the low-pressure side of the closed system at a pressure of about 2-3 MPa, which is used to replenish the system and maintain the continuous and stable operation of the system.

[0016] This system can also be driven by an asynchronous motor, achieving roughly the same effect and significantly reducing the cost of the drive motor. However, this results in a decrease in system control precision due to the inherent characteristics of asynchronous motors, such as increased size, narrower speed range, and uneven power output. Other improvement methods include using an asynchronous motor to drive a closed-loop variable displacement piston pump, which can maintain the motor operating in its high-efficiency range. Displacement and pressure response control are achieved through the variable displacement pump, but this again increases costs and reduces control flexibility. Replacing the fixed displacement piston pump with a fixed displacement gear pump in the system can achieve even lower costs, but this increases system heat generation and reduces system pressure. The pulsation of the gear pump is unavoidable, thus increasing noise.

[0017] This invention utilizes a closed-loop hydraulic system design, which significantly reduces the installation space required and improves hydraulic transmission efficiency compared to traditional hydraulic transmission. Furthermore, by eliminating valve switching and directly connecting a fixed-displacement piston pump and a hydraulic motor, system heat generation is effectively reduced. Since the pump is electrically driven, the output torque and speed can be monitored to adjust the drive motor's output strategy in real time, controlling the brush speed to match current snow removal needs, quickly responding to driver operations, and reducing energy consumption. Compared to traditional closed-loop hydraulic systems composed of variable displacement pumps, this design offers lower costs and achieves or surpasses the performance of traditional variable displacement pump closed-loop hydraulic systems. It is easily adaptable to a large number of new energy vehicles on the market, has a wide range of applications, and possesses significant practical and promotional value.

[0018] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A hydraulic transmission system for snow removal roller brushes in new energy vehicles, characterized in that: The system includes a hydraulic transmission system and a replenishment system. The hydraulic transmission system includes a main pump drive motor, a fixed displacement piston hydraulic pump, a main relief valve, a flushing valve, and a roller brush hydraulic motor. The main pump drive motor drives the fixed displacement piston hydraulic pump, providing a power source for the hydraulic system. The fixed displacement piston hydraulic pump and the roller brush hydraulic motor are connected and driven by high-pressure and low-pressure pipelines. A main relief valve and a flushing valve are also connected in parallel between the high-pressure and low-pressure pipelines. The flushing valve's return flow is connected to the oil tank. The replenishment system includes a replenishment pump, a replenishment relief valve, and a replenishment pump drive motor. The replenishment pump drive motor drives the replenishment pump, providing a power source for the replenishment system. One end of the replenishment pump is connected to the oil tank, and the other end is connected to the low-pressure pipeline, replenishing the hydraulic oil in the oil tank to the low-pressure pipeline. The replenishment relief valve is located between the low-pressure pipeline and the replenishment pump, and the return flow of the replenishment relief valve is connected to the oil tank.

2. The hydraulic transmission system for a snow removal roller brush in a new energy vehicle according to claim 1, characterized in that: The main pump drive motor is a permanent magnet synchronous motor.

3. The hydraulic transmission system for a snow removal roller brush in a new energy vehicle according to claim 1, characterized in that: The quantitative plunger hydraulic pump is a quantitative plunger pump.

4. The hydraulic transmission system for a snow removal roller brush in a new energy vehicle according to claim 1, characterized in that: The main relief valve is a pilot-operated relief valve used to limit the pressure of the hydraulic system.

5. A hydraulic transmission system for a snow removal roller brush in a new energy vehicle according to claim 1, characterized in that: The oil replenishment pump is a gear oil pump.

6. A hydraulic transmission system for a snow removal roller brush in a new energy vehicle according to claim 1, characterized in that: The oil replenishment relief valve is a standard direct-acting relief valve, and an oil replenishment pressure of 2-3 MPa can be set according to system requirements.

7. A hydraulic transmission system for a snow removal roller brush in a new energy vehicle according to claim 1, characterized in that: The oil replenishment pump drive motor is a low-power motor that drives the oil replenishment pump at a constant speed.

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