Oil way structure for oil cooling of electric drive dual-motor stator of counterweight truck

Abstract

The utility model discloses an oil circuit structure for oil cooling of counter-weight truck electric drive double motor stators, which comprises a delivery oil duct, an oil pump and a cooler, the delivery oil duct comprises a pump suction section, a pump-out section and a cold oil distribution section, and the oil pump and the cooler are arranged on the outer side of a front shell below an electric drive motor I and an electric drive motor II. One end of the pump suction section is located below the liquid level of lubricating oil at the bottom of the electric drive inner cavity, the other end of the pump suction section is connected with the oil pump, and the pump-out section is arranged between the oil pump and the cooler. Lubricating oil at the bottom of the electric drive inner cavity sequentially flows through the pumping section, the oil pump, the pumping-out section and the cooler and then is conveyed to stators of the first motor and the second motor through the cold oil distribution section. The motor cooling system has the advantages that the stator of the first motor and the stator of the second motor can be cooled through electric drive by means of self-contained lubricating oil, redundant arrangement of a water source water pipe of a traditional water cooling system is omitted, and therefore the development requirements for light weight and small size of a vehicle are better met; setting is simple and reliable.

Description

Technical Field

[0001] The utility model relates to an oil circuit junction for oil cooling stators of electric drive double motors of heavy trucks, belonging to the technical field of electric drive cooling. Background Art

[0002] In the development of new energy electrification, heavy-duty commercial vehicles have to ensure uninterrupted shifting power and integrated lightweighting as the main trend. Therefore, heavy-duty commercial vehicle electric drive products generally use dual motors. In consideration of lightweighting, high-speed motors are further used. Under the same power condition, the motor torque can be reduced, thereby reducing the size of the motor and achieving lightweighting.

[0003] When a high-speed motor is running at high speed, the magnetic flux distribution inside the motor becomes uneven. Since the current generates different magnetic fields in different areas, the iron core generates more eddy current losses in these areas, which are converted into heat energy, causing the motor temperature to rise. If the heat is not dissipated in time, the entire motor will continue to rise through heat conduction. At the same time, the increase in winding temperature will increase the resistance of the copper material, which in turn causes the resistance to generate more heat. Therefore, temperature is an important factor affecting the operating efficiency and performance of the motor.

[0004] Traditional heavy-duty commercial trucks use water-cooled motor stators, which requires the addition of water sources and pipelines. This not only increases costs, but is also contrary to miniaturization and lightweighting.

[0005] This application aims to solve the above-mentioned problems. In order to make the solutions to the above-mentioned problems more targeted, we conducted relevant patent searches, but did not obtain any patent literature related to the oil circuit structure for oil cooling of dual motor stators. Utility Model Content

[0006] The technical problem to be solved by the utility model is: how to utilize the lubricating oil resources of the electric drive itself to construct an oil circuit structure capable of conveying cooling oil to the stators of two motors.

[0007] In view of the above problems, the technical solution proposed by the utility model is:

[0008] An oil circuit structure for oil cooling the stator of a heavy-duty electric drive dual motor comprises an oil delivery passage, an oil pump and a cooler, the oil delivery passage comprises a pump suction section, a pump discharge section and a cold oil distribution section, the oil pump and the cooler are mounted on the outside of a front housing below a first motor and a second motor of the electric drive, one end of the pump suction section is located below the liquid level of the lubricating oil at the bottom of an inner cavity of the electric drive, and the other end is connected to the oil pump, the pump discharge section is arranged between the oil pump and the cooler, the cold oil distribution section is arranged between the cooler and the first motor and the second motor, the lubricating oil at the bottom of the inner cavity of the electric drive flows through the pump suction section, the oil pump, the pump discharge section and the cooler in sequence, and is then respectively delivered to the stators of the first motor and the second motor through the cold oil distribution section.

[0009] Furthermore, the pumping section includes a pipeline section located in the inner cavity of the electric drive and a wall hole section connected to the pipeline section and opened in the wall of the front shell of the electric drive.

[0010] Furthermore, the pipeline section includes a sedimentation section and a sinking tube section. The sedimentation section is inclined from top to bottom, and has a mounting seat at the upper end. It is installed on the inner wall of the front shell of the electric drive through the mounting seat and docked with the port of the wall hole section. The lower end is connected to the sinking tube section below the lubricating oil level. The sinking tube section is immersed below the lubricating oil level, and has an oil suction port at its outer end.

[0011] Furthermore, the outer periphery of the immersed tube section is covered with a cylindrical filter mesh sleeve.

[0012] Furthermore, one end of the filter mesh sleeve is a closed end, and the other end is a sleeve end, the sleeve end is sleeved on the outer periphery of the immersed tube section, and the sleeve end of the filter mesh sleeve is locked on the outer periphery of the immersed tube section by an annular locking sleeve.

[0013] Furthermore, the inner diameter of the filter mesh sleeve is larger than the outer diameter of the immersed tube section, a circumferentially outwardly protruding gasket edge is provided on the outer periphery of the immersed tube section, and the sleeve end of the filter mesh sleeve is sleeved on the outer periphery of the gasket edge.

[0014] Furthermore, both sides of the closed end of the filter mesh sleeve are closed with inclined surfaces.

[0015] Furthermore, the oil suction port of the immersed tube section is a bevel port.

[0016] Furthermore, the cold oil distribution section includes a main section and distribution section one and distribution section two. The main section is led out from the cooler, goes up to the top in the front shell wall, and then turns forward to the top of motor one and motor two. One ends of the distribution section one and distribution section two are respectively connected to the main section above motor one and motor two, and the other ends of the distribution section one and distribution section two lead to the stators of motor one and motor two respectively.

[0017] Furthermore, the oil pump is an electronic oil pump. Beneficial Effects

[0018] 1. The electric drive can use its own lubricating oil to cool the stators of motor 1 and motor 2, eliminating the redundant setting of water source pipes in the traditional water cooling system, thus better meeting the development requirements of lightweight and miniaturized vehicle;

[0019] 2. The setting is simple and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A three-dimensional schematic diagram of the oil circuit structure being arranged on the front housing of the electric drive;

[0021] Figure 2The three-dimensional schematic diagram of the oil circuit structure being arranged on the front housing of the electric drive, showing the installation positions of the motor 1 and the motor 2 to be reached by the oil circuit structure;

[0022] Figure 3 for Figure 1 A partial enlarged view of

[0023] Figure 4 is a three-dimensional schematic diagram of a pipeline section of the pump suction section;

[0024] Figure 5 is a cross-sectional schematic diagram of a pipeline section of the pump suction section;

[0025] Figure 6 It is a schematic diagram of the entire oil circuit structure.

[0026] In the figure: 1. oil pump; 2. cooler; 3. pump suction section; 31. pipeline section; 311. sedimentation section; 3111. mounting seat; 312. sinker section; 3121. oil suction port; 3122. gasket; 32. wall hole section; 4. pump outlet section; 5. cold oil distribution section; 51. total section; 52. distribution section one; 53. distribution section two; 6. return hole; 7. filter sleeve; 71. closed end; 72. sleeve end; 8. annular locking sleeve; 100. electric drive; 101. motor one; 102. motor two; 103. lubricating oil. DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with the accompanying drawings:

[0028] like Figure 1 , 2 As shown in Figures 3 and 6, an oil circuit structure for oil cooling the stator of a heavy-duty electric drive dual motor includes an oil delivery channel, an oil pump and a cooler 2, wherein the oil delivery channel includes a pump suction section 3, a pump discharge section 4 and a cold oil distribution section 5, the oil pump and the cooler 2 are installed on the outside of the front housing below the motor 1 101 and the motor 2 102 of the electric drive 100, one end of the pump suction section 3 is located below the liquid level of the lubricating oil 103 at the bottom of the inner cavity of the electric drive, and one end is connected to the oil pump 1, the pump discharge section 4 is arranged between the oil pump 1 and the cooler 2, and the cold oil distribution section 5 is arranged between the cooler 2 and the motor 1 101 and the motor 2 102. When in use, the lubricating oil 103 at the bottom of the inner cavity of the electric drive flows through the pump suction section 3, the oil pump 1, the pump out section 4, and the cooler 2 in sequence, and is then transported to the stators of the motor 1 101 and the motor 2 102 by the cold oil distribution section 5. In this way, the electric drive uses its own lubricating oil, and under the pump pressure of the oil pump, it flows through the pump suction section 3, the oil pump 1, and the pump out section 4 through the cooler 2 for cooling, and then is distributed to the motor 1 101 and the motor 2 102 through the cold oil distribution section 5, so as to cool the stators of the motor 101 and the motor 2 102, eliminating the redundant setting of the water source water pipe of the traditional water cooling system, thereby better meeting the development requirements of lightweight and miniaturized vehicle.

[0029] The lubricating oil used to cool the motor stator flows back into the housing of the electric drive through the reflux hole 6 provided on the front housing wall below the stator.

[0030] like Figure 3 As shown in FIG. 5 , further, the pump suction section 3 includes a pipe section 31 located in the inner cavity of the electric drive and a wall hole section 32 connected to the pipe section 31 and opened in the wall of the front shell of the electric drive 100. The pipe section 31 includes a settling section 311 and a sinking tube section 312. The settling section 311 is inclined from top to bottom, and has a mounting seat 3111 at the upper end. The mounting seat 3111 is installed on the inner wall of the front shell of the electric drive 100 and docked with the port of the wall hole section 32. The lower end is connected to the sinking tube section 312 below the liquid level of the lubricating oil. The sinking tube section 312 is immersed below the liquid level of the lubricating oil 103, and has an oil suction port 3121 at its outer end. In this way, it is not necessary to set the oil pump at a position too low close to the bottom of the electric drive 100 to avoid interference when the electric drive is installed, and it is convenient to set a filter component on the sinking tube section 312 later.

[0031] The outer periphery of the above-mentioned immersed tube section 312 is covered with a cylindrical filter mesh sleeve 7. One end of the filter mesh sleeve 7 is a closed end 71, and the other end is a sleeve end 72, which is sleeved on the outer periphery of the immersed tube section 312, and the sleeve end 72 of the filter mesh sleeve 7 is locked on the outer periphery of the immersed tube section 312 by an annular locking sleeve 8, so that the filter mesh sleeve 7 is firmly fixed.

[0032] In order to allow a large amount of lubricating oil to enter, the inner diameter of the filter mesh sleeve 7 is larger than the outer diameter of the sinking tube section 312, so that an oil-passing gap is formed between the filter mesh sleeve 7 and the outer periphery of the sinking tube section 312. In order to facilitate installation, a circumferentially outwardly protruding gasket edge 3122 is provided on the outer periphery of the sinking tube section 312, and the sleeve end 72 of the filter mesh sleeve 7 is sleeved on the outer periphery of the gasket edge 3122.

[0033] The closed end 71 of the filter screen sleeve 7 is closed with inclined surfaces on both sides, which is conducive to pinching and closing the closed end 71 of the filter screen sleeve 7 during processing.

[0034] The oil suction port 3121 of the immersed tube section 312 is a beveled port, which can also increase the inlet of lubricating oil.

[0035] like Figure 2 , 6As shown, the cold oil distribution section 5 includes a main section 51 and a distribution section 1 52 and a distribution section 2 53. The main section 51 is led out from the cooler 2, goes up to the top in the front shell wall, and then turns forward to the top of the motor 1 101 and the motor 2 102. One ends of the distribution section 1 52 and the distribution section 2 53 are respectively connected to the main section 51 above the motor 1 101 and the motor 2 102, and the other ends of the distribution section 1 52 and the distribution section 2 53 lead to the stators of the motor 1 101 and the motor 2 102 respectively.

[0036] Preferably, the oil pump is an electronic oil pump.

[0037] The above embodiments are only used to more clearly describe the present invention and cannot be regarded as limiting the protection scope of the present invention. Any modifications in equivalent forms should be regarded as falling within the protection scope of the present invention.

Claims

1. An oil circuit structure for oil cooling the stators of the electric drive dual motors of a heavy truck, characterized by: The invention comprises an oil delivery passage, an oil pump (1) and a cooler (2), wherein the oil delivery passage comprises a pumping section (3), a pumping section (4) and a cold oil distribution section (5), wherein the oil pump and the cooler (2) are mounted on the outside of a front housing below a motor 1 (101) and a motor 2 (102) of an electric drive (100), wherein one end of the pumping section (3) is located below the liquid level of lubricating oil (103) at the bottom of an inner cavity of the electric drive, and the other end is connected to the oil pump (1), wherein the pumping section (4) is arranged between the oil pump (1) and the cooler (2), and wherein the cold oil distribution section (5) is arranged between the cooler (2) and the motor 1 (101) and the motor 2 (102), wherein the lubricating oil (103) at the bottom of the inner cavity of the electric drive flows through the pumping section (3), the oil pump (1), the pumping section (4) and the cooler (2) in sequence, and is then respectively delivered to the stators of the motor 1 (101) and the motor 2 (102) by the cold oil distribution section (5).

2. The oil circuit structure for oil cooling the stators of the electric drive dual motors of heavy trucks according to claim 1 is characterized in that: The pumping section (3) comprises a pipeline section (31) located in the inner cavity of the electric drive, and a wall hole section (32) communicated with the pipeline section (31) and opened in the front housing wall of the electric drive (100).

3. The oil circuit structure for oil cooling the stators of the electric drive dual motors of heavy trucks according to claim 2 is characterized in that: The pipeline section (31) comprises a settling section (311) and a sinking tube section (312); the settling section (311) is inclined from top to bottom, and has a mounting seat (3111) at the upper end, and is mounted on the inner wall of the front housing of the electric drive (100) through the mounting seat (3111) to dock with the port of the wall hole section (32); the lower end is connected to the sinking tube section (312) below the liquid level of the lubricating oil; the sinking tube section (312) is immersed below the liquid level of the lubricating oil (103), and has an oil suction port (3121) at the outer end.

4. The oil circuit structure for oil cooling the stators of the electric drive dual motors of a heavy truck according to claim 3 is characterized in that: The outer circumference of the immersed tube section (312) is covered with a cylindrical filter mesh sleeve (7).

5. The oil circuit structure for oil cooling the stators of the electric drive dual motors of heavy trucks according to claim 4 is characterized in that: One end of the filter mesh sleeve (7) is a closed end, and the other end is a sleeve end (72), the sleeve end (72) is sleeved on the outer circumference of the immersed tube section (312), and the sleeve end (72) of the filter mesh sleeve (7) is locked on the outer circumference of the immersed tube section (312) by an annular locking sleeve (8).

6. The oil circuit structure for oil cooling the stators of the electric drive dual motors of a heavy truck according to claim 5 is characterized in that: The inner diameter of the filter mesh sleeve (7) is larger than the outer diameter of the immersed tube section (312); a circumferentially outwardly convex gasket edge (3122) is provided on the outer periphery of the immersed tube section (312); and the sleeve end (72) of the filter mesh sleeve (7) is sleeved on the outer periphery of the gasket edge (3122).

7. The oil circuit structure for oil cooling the stators of the electric drive dual motors of a heavy truck according to claim 5 is characterized in that: The closed end (71) of the filter mesh sleeve (7) is closed with inclined surfaces on both sides.

8. The oil circuit structure for oil cooling the stators of the electric drive dual motors of a heavy truck according to claim 6 is characterized in that: The oil suction port (3121) of the immersed tube section (312) is a bevel port.

9. The oil circuit structure for oil cooling the stator of the electric drive dual motor of a heavy truck according to any one of claims 1 to 8, characterized in that: The cold oil distribution section (5) comprises a main section (51) and a distribution section 1 (52) and a distribution section 2 (53). The main section (51) is led out from the cooler (2), goes up to the top in the front shell wall, and then turns forward to the top of the motor 1 (101) and the motor 2 (102). One end of the distribution section 1 (52) and the distribution section 2 (53) are respectively connected to the main section (51) above the motor 1 (101) and the motor 2 (102), and the other end of the distribution section 1 (52) and the distribution section 2 (53) are respectively connected to the stators of the motor 1 (101) and the motor 2 (102).

10. The oil circuit structure for oil cooling the stator of the electric drive dual motor of a heavy truck according to any one of claims 1 to 8, characterized in that: The oil pump is an electronic oil pump.

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