Integrated oil-cooled electric drive applied to non-road mechanical vehicle

Abstract

The invention relates to the technical field of oil cooling electric drive, and discloses an integrated oil cooling electric drive applied to a non-road mechanical vehicle, the integrated oil cooling electric drive is composed of an oil cooling flat wire motor, a motor controller, an electronic oil pump, an oil cooler and an oil pan, the oil pan is located below the bottom of the oil cooling flat wire motor, and the motor controller is connected with the electronic oil pump. The electronic oil pump is installed below a rear end cover of the oil-cooled flat wire motor, the oil cooler and the motor controller are located on the rear end cover, a water inlet is formed in the upper end of the motor controller, a DC connector is installed on the right side of the motor controller, and an oil pan is installed at the lowest end of the integrated oil-cooled flat wire motor. And the left end of the integrated oil-cooled electric drive is rotationally connected with a motor output shaft. According to the integrated oil-cooled electric drive and oil-cooled motor applied to the non-road mechanical vehicle, heat dissipation of the non-road vehicle at high speed and high power can be well achieved, meanwhile, a cooling loop can be independently formed, the integrated oil-cooled electric drive does not need to share cooling oil with a gearbox, an oil cooling circulation system is integrated in the integrated oil-cooled electric drive, and self-cooling heat dissipation can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil-cooled electric drives, and specifically to an integrated oil-cooled electric drive applied to non-road mechanical vehicles. Background Art

[0002] Oil-cooled electric drive is a cooling technology for electric vehicle drive systems. Its core lies in using oil as the cooling medium to directly or indirectly dissipate heat from key components inside the motor. Compared with traditional water-cooled electric drives, the refrigerant medium and heat exchange method of the oil-cooled electric drive are different from those of water-cooled motors. Only by controlling the heat of the motor can the maximum output potential of the motor be fully exploited, and at the same time, the reliability of the motor (especially winding insulation) can be improved. In addition, as the motor is developing towards higher speeds, the reliability of the motor bearings faces huge challenges, and the oil-cooled electric drive can well solve the problem of bearing lubrication and cooling. Therefore, each OEM and Tier1 are conducting the development and application of oil-cooled electric drives.

[0003] Currently, all non-road vehicles in the market are water-cooled motors, and the cooling effect of water-cooled motors is not good. Especially when the motor is running at high speed or high power, the water-cooled motor fails to cool the motor stator properly, resulting in either power derating or demagnetization of the permanent magnets, and the maximum performance of the motor cannot be achieved. The oil-cooled motor can well solve the heat dissipation problem of non-road vehicles at high speed and high power. However, a single oil-cooled motor needs to be designed in combination with a gearbox and requires oil extraction from the gearbox, and it cannot form an independent cooling circuit. Therefore, there is an urgent need for an integrated oil-cooled electric drive applied to non-road mechanical vehicles to solve the above technical problems. Summary of the Invention

[0004] The purpose of the present invention is to provide an integrated oil-cooled electric drive applied to non-road mechanical vehicles to solve the problems raised in the above background art, that is, all non-road vehicles in the current market are water-cooled motors, and the cooling effect of water-cooled motors is not good. Especially when the motor is running at high speed or high power, the water-cooled motor fails to cool the motor stator properly, resulting in either power derating or demagnetization of the permanent magnets, and the maximum performance of the motor cannot be achieved. The oil-cooled motor can well solve the heat dissipation problem of non-road vehicles at high speed and high power. However, a single oil-cooled motor needs to be designed in combination with a gearbox and requires oil extraction from the gearbox, and it cannot form an independent cooling circuit.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: An integrated oil-cooled electric drive applied to non-road machinery vehicles, which is composed of an oil-cooled flat wire motor, a motor controller, an electronic oil pump, an oil cooler, and an oil pan. The oil pan is located below the bottom of the oil-cooled flat wire motor. The electronic oil pump is installed below the rear end cover of the oil-cooled flat wire motor. The oil cooler and the motor controller are located on the rear end cover. The upper end of the motor controller is provided with a water inlet, and a DC connector is installed on the right side of the motor controller. The bottom of the integrated oil-cooled electric drive is installed with an oil pan, and the left end of the integrated oil-cooled electric drive is rotatably connected with a motor output shaft. The left side of the electronic oil pump is provided with a water outlet.

[0006] Preferably, the cross-sections of the water inlet and the water outlet are circular, and their specifications are the same.

[0007] Preferably, the oil-cooled flat wire motor introduces a cooling oil circulation system inside the oil-cooled flat wire motor, directly conveys the cooling oil to the vicinity of the heating components of the oil-cooled flat wire motor, and takes away heat through heat exchange.

[0008] Preferably, the DC connector is used to connect the DC power supply and the oil-cooled electric drive to realize the transmission and conversion of electric energy.

[0009] Preferably, the motor controller controls the motor to work according to the set direction, speed, angle, and response time by actively working.

[0010] Preferably, the oil cooler adopts a water-cooled oil cooler, which uses water as a medium to exchange heat with oil.

[0011] Preferably, the motor output shaft is used to transmit torque and rotational motion of the oil-cooled flat wire motor. The motor output shaft is connected to the oil-cooled flat wire motor to realize power transmission.

[0012] Preferably, cooling water flows in from the water inlet of the motor controller. After cooling the motor controller, it flows to the oil cooler to cool the cooling oil from the electronic oil pump.

[0013] Preferably, the electronic oil pump sucks oil from the oil pan at the bottom of the oil-cooled flat wire motor, flows to the oil cooler after being pressurized, and flows to the end winding of the oil-cooled flat wire motor after being cooled by the cooling water of the oil cooler.

[0014] Compared with the prior art, the present invention has the following beneficial effects: Compared with traditional water-cooled motors, the oil-cooled electric drive has higher heat dissipation efficiency and reliability, especially outstanding in meeting the heat dissipation requirements of high-power density and high-speed motors; and for the integrated oil-cooled electric drive applied to non-road mechanical vehicles, the oil-cooled motor can well solve the heat dissipation problems of non-road vehicles at high speeds and high powers, and can form a separate cooling circuit. Moreover, this integrated oil-cooled electric drive does not need to share the cooling oil with the transmission, and integrates an oil cooling circulation system inside, which can self-cool and dissipate heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Other features, objects, and advantages of the present application will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings: Figure 1 It is a schematic diagram of the overall structure of the integrated oil-cooled electric drive applied to non-road mechanical vehicles according to the present invention; Figure 2 It is a schematic diagram of the partial structure of the integrated oil-cooled electric drive applied to non-road mechanical vehicles according to the present invention; In the figure: 1, electric oil pump; 2, water outlet; 3, oil cooler; 4, oil-cooled flat wire motor; 5, water inlet; 6, motor controller; 7, DC connector; 8, oil sump; 9, motor output shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The present application will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related invention, rather than limiting the invention. In addition, it should be noted that for the sake of description, only the parts related to the invention are shown in the drawings. In the drawings of the embodiments of the present invention: different types of hatching lines in the figure are not marked according to the national standard, nor are the materials of the components required, but are used to distinguish the cross-sectional views of the components in the figure.

[0017] Please refer to Figure 1-2 , an integrated oil-cooled electric drive applied to non-road mechanical vehicles, which is composed of an oil-cooled flat wire motor 4, a motor controller 6, an electric oil pump 1, an oil cooler 3, and an oil sump 8. The oil sump 8 is located below the bottom of the oil-cooled flat wire motor 4. The electric oil pump 1 is installed below the rear end cover of the oil-cooled flat wire motor 4. The oil cooler 3 and the motor controller 6 are located on the rear end cover. The upper end of the motor controller 6 is provided with a water inlet 5, and a DC connector 7 is installed on the right side of the motor controller 6. The bottom end of the integrated oil-cooled electric drive is provided with an oil sump 8, and the left end of the integrated oil-cooled electric drive is rotatably connected to a motor output shaft 9. A water outlet 2 is provided at the left side position of the electric oil pump 1.

[0018] Among them, the cross-sections of the water inlet 5 and the water outlet 2 are circular, and their specifications are the same.

[0019] Among them, the oil-cooled flat wire motor 4 introduces a cooling oil circulation system inside the oil-cooled flat wire motor 4, directly delivers the cooling oil to the vicinity of the heat-generating components of the oil-cooled flat wire motor 4, and takes away heat through heat exchange.

[0020] Among them, the DC connector 7 is used to connect the DC power supply and the oil-cooled electric drive to achieve the transmission and conversion of electrical energy.

[0021] Among them, the motor controller 6 actively works to control the motor to work according to the set direction, speed, angle, and response time.

[0022] Among them, the oil cooler 3 adopts a water-cooled oil cooler, which uses water as a medium to exchange heat with oil.

[0023] Among them, the motor output shaft 9 is used to transmit torque and rotational motion of the oil-cooled flat wire motor 4. The motor output shaft 9 is connected to the oil-cooled flat wire motor 4 to achieve power transmission.

[0024] Among them, the cooling water flows in from the water inlet 5 of the motor controller 6. After cooling the motor controller 6, it flows to the oil cooler 3 to cool the cooling oil from the electronic oil pump 1.

[0025] Among them, the electronic oil pump 1 sucks oil from the oil pan 8 at the bottom of the oil-cooled flat wire motor 4, flows to the oil cooler 3 after being pressurized, and after being cooled by the cooling water of the oil cooler 3, it flows to the end winding of the oil-cooled flat wire motor 4.

[0026] The working principle and usage process of the present invention: The integrated oil-cooled electric drive is composed of an oil-cooled flat wire motor 4, a motor controller 6, an electronic oil pump 1, an oil cooler 3, and an oil pan 8; When the motor controller 6 drives the oil-cooled flat wire motor 4 to work, the electronic oil pump 1 sucks oil from the oil pan 8 at the bottom of the oil-cooled flat wire motor 4, flows to the oil cooler 3 after being pressurized, and after being cooled by the cooling water of the oil cooler 3, it flows to the end winding of the oil-cooled flat wire motor 4. The cooling oil dripping from the winding flows back to the oil pan 8 from the bottom of the oil-cooled flat wire motor 4, thus completing the internal circulation of the cooling oil; The cooling water flows in from the water inlet 5 of the motor controller 6. After cooling the motor controller 6, it flows to the oil cooler 3 to cool the cooling oil from the electronic oil pump 1.

[0027] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0028] The above description is only a preferred embodiment of the present application and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) disclosed in the present application that have similar functions.

Claims

1. An integrated oil-cooled electric drive applied to non-road mechanical vehicles, characterized in that: The integrated oil-cooled electric drive consists of an oil-cooled flat wire motor (4), a motor controller (6), an electric oil pump (1), an oil cooler (3), and an oil pan (8). The oil pan (8) is located below the bottom of the oil-cooled flat wire motor (4). The electric oil pump (1) is installed below the rear end cover of the oil-cooled flat wire motor (4). The oil cooler (3) and the motor controller (6) are located on the rear end cover. An inlet (5) is provided at the upper end of the motor controller (6), and a DC connector (7) is installed on the right side of the motor controller (6). The oil pan (8) is installed at the lowermost end of the integrated oil-cooled electric drive, and a motor output shaft (9) is rotatably connected to the left end of the integrated oil-cooled electric drive. An outlet (2) is provided at the left side of the electric oil pump (1).

2. The integrated oil-cooled electric drive applied to non-road mechanical vehicles according to claim 1, wherein: The cross-sections of the inlet (5) and the outlet (2) are circular, and their specifications are the same.

3. The integrated oil-cooled electric drive applied to non-road mechanical vehicles according to claim 1, wherein: The oil-cooled flat wire motor (4) introduces a cooling oil circulation system inside the oil-cooled flat wire motor (4) to directly transport the cooling oil near the heat-generating components of the oil-cooled flat wire motor (4) and take away heat through heat exchange.

4. The integrated oil-cooled electric drive applied to non-road mechanical vehicles according to claim 1, wherein: The DC connector (7) is used to connect the DC power supply and the oil-cooled electric drive to achieve the transmission and conversion of electrical energy.

5. The integrated oil-cooled electric drive applied to non-road mechanical vehicles according to claim 1, wherein: The motor controller (6) actively operates to control the motor to work in accordance with the set direction, speed, angle, and response time.

6. The integrated oil-cooled electric drive applied to non-road mechanical vehicles according to claim 1, wherein: The oil cooler (3) is a water-cooled oil cooler, which uses water as a medium to exchange heat with oil.

7. An integrated oil-cooled electric drive applied to non-road mechanical vehicles according to claim 1, characterized in that: The motor output shaft (9) is used to transmit torque and rotational motion of the oil-cooled flat wire motor (4). The motor output shaft (9) is connected to the oil-cooled flat wire motor (4) to achieve power transmission.

8. The integrated oil-cooled electric drive applied to non-road mechanical vehicles according to claim 1, characterized in that: Cooling water flows in from the inlet (5) of the motor controller (6). After cooling the motor controller (6), it flows to the oil cooler (3) to cool the cooling oil from the electric oil pump (1).

9. The integrated oil-cooled electric drive applied to non-road mechanical vehicles according to claim 1, wherein: The electric oil pump (1) sucks oil from the oil pan (8) at the bottom of the oil-cooled flat wire motor (4), pressurizes it and flows to the oil cooler (3). After being cooled by the cooling water in the oil cooler (3), it flows to the end winding of the oil-cooled flat wire motor (4).

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