Speed reducer oil cooling loop and electric drive system cooling assembly

Abstract

The speed reducer oil cooling loop comprises a first oil duct and a second oil duct, the first oil duct is connected with an oil pump and an oil cooler, one end of the second oil duct is connected with the oil cooler, and the other end of the second oil duct is led into a speed reducer shell. The second oil duct comprises a first branch section, a second branch section and a third branch section, the first branch section is arranged in the main shell, the second branch section is arranged in the cover cap, the third branch section is arranged between the main shell and the cover cap, one end of the first branch section is connected with the oil cooler, the other end of the first branch section is connected with one end of the second branch section, and the other end of the second branch section is connected with one end of the third branch section; the other end of the third branch section is connected to the main shell, the first branch section is arranged above the output shaft installation area of the speed reducer shell, the second branch section is arranged above the output shaft installation area and the middle shaft installation area, and the third branch section is arranged above the position between the middle shaft installation area and the input shaft installation area. The integration level and the light weight of the electric drive system can be improved, and the overall performance of the electric drive system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to a reducer oil cooling circuit and an electric drive system cooling assembly. Background Art

[0002] With the continuous advancement of new energy vehicle technology, the requirements for heat dissipation performance of electric drive systems are getting higher and higher. Oil cooling has become one of the key technologies to improve motor performance with its efficient heat dissipation capability. Oil cooling directly cools the heat source inside the motor and reducer through oil. Compared with water cooling solutions, oil cooling can more effectively reduce thermal resistance and improve heat dissipation efficiency, thereby ensuring stable operation of the motor at high power and high speed.

[0003] As the requirements for the lightweight and integrated degree of the electric drive system increase, the requirements for optimizing the structural design of the oil cooling circuit in the electric drive system also increase. Therefore, it is necessary to design a reducer oil cooling circuit and electric drive system cooling assembly that can improve the integration and lightweight of the electric drive system and improve the overall performance of the electric drive system. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a reducer oil cooling circuit and an electric drive system cooling assembly that can improve the integration and lightweight of the electric drive system and improve the overall performance of the electric drive system.

[0005] The technical solution of the present invention provides a reducer oil cooling circuit, comprising an oil pump and an oil cooler, wherein the oil pump is arranged on the inner side of the reducer housing, and the oil cooler is installed on the outer side of the reducer housing, and further comprising a first oil passage and a second oil passage, wherein the first oil passage connects the oil pump and the oil cooler, and one end of the second oil passage is connected to the oil cooler, and the other end leads to the interior of the reducer housing; The reducer housing includes a main housing and a cover, and the reducer housing also includes an output shaft installation area, an intermediate shaft installation area and an input shaft installation area; The second oil passage includes a first branch segment, a second branch segment and a third branch segment, the first branch segment is arranged in the main housing, the second branch segment is arranged in the cover, the third branch segment is arranged between the main housing and the cover, one end of the first branch segment is connected to the oil cooler, and the other end is connected to one end of the second branch segment, the other end of the second branch segment is connected to one end of the third branch segment, and the other end of the third branch segment is connected to the main housing, the first branch segment is arranged above the output shaft mounting area of ​​the reducer housing, the second branch segment is arranged above the output shaft mounting area and the intermediate shaft mounting area, and the third branch segment is arranged above between the intermediate shaft mounting area and the input shaft mounting area.

[0006] Further, the first branch section extends along the width direction of the main housing, and the first branch section includes a first branch oil circuit and a second branch oil circuit, the first branch oil circuit extends in a direction away from the cover, and the second branch oil circuit extends in a direction close to the cover, a first oil hole is provided in the first branch oil circuit, and a second oil hole is provided in the second branch oil circuit, the first oil hole leads to the intermediate shaft installation area, and the second oil hole leads to the output shaft installation area.

[0007] Furthermore, the first oil hole is opened at the intermediate shaft bearing installation position in the intermediate shaft installation area.

[0008] Furthermore, the second oil hole corresponds to the meshing position of the output shaft gear and the intermediate shaft gear.

[0009] Furthermore, the second branch segment includes a first vertical segment, an extension segment and a second vertical segment in sequence, the first vertical segment is along the width direction of the cover and is connected to the second branch oil circuit, the extension segment is along the length direction of the cover, the second vertical segment is along the width direction of the cover and is connected to the third branch segment, the extension segment is provided with a third oil hole, and the third oil hole leads to the intermediate shaft installation area.

[0010] Furthermore, the second branch segment also includes a third vertical segment, one end of the third vertical segment is connected to the first vertical segment, and the other end is connected to the central through hole of the output shaft of the reducer, and the third vertical segment is perpendicular to the first vertical segment, and a fourth oil hole is provided on the third vertical segment, and the fourth oil hole leads to the output shaft installation area.

[0011] Further, the third branch segment includes a fifth oil hole and a sixth oil hole, the fifth oil hole leads to the input shaft installation area, and the sixth oil hole leads to the intermediate shaft installation area.

[0012] The present invention also provides an electric drive system cooling assembly, including a motor cooling circuit and an electronic control cooling circuit, including the reducer oil cooling circuit described in any one of the above items.

[0013] Furthermore, the first branch oil circuit is in communication with the motor cooling circuit.

[0014] Furthermore, the oil cooler is in communication with the electronically controlled cooling circuit.

[0015] After adopting the above technical solution, the following beneficial effects are achieved: In the present invention, a reducer oil cooling circuit is arranged in the reducer housing, and oil can be actively sprayed into various areas inside the reducer to achieve active oil cooling of the reducer. In addition, since the reducer oil cooling circuit is entirely arranged inside the reducer housing, it is beneficial to the lightweight and integration of the reducer housing, and no external oil cooling pipeline is required, making the overall structure of the electric drive system compact, which is beneficial to improving the overall performance of the electric drive system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings: Figure 1 is a three-dimensional diagram of an electric drive system in one embodiment of the present invention; Figure 2 is an exploded view of an electric drive system in one embodiment of the present invention with a cover omitted; Figure 3 is a schematic diagram of the internal structure of the main housing in one embodiment of the present invention; Figure 4 It is a partial structure enlargement of the main housing in one embodiment of the present invention. Figure 1 ; Figure 5 It is a partial structure enlargement of the main housing in one embodiment of the present invention. Figure 2 ; Figure 6 is a schematic diagram of the outer side of a cover in one embodiment of the present invention; Figure 7 is a schematic diagram of the inner side of a cover in one embodiment of the present invention; Figure 8 is a three-dimensional diagram of a cooling assembly of an electric drive system in one embodiment of the present invention; Fig. 9 1 is a top view of a cooling assembly of an electric drive system in one embodiment of the present invention.

[0017] Reference table of reference numerals: Oil pump 1, oil cooler 2, first oil channel 4, motor housing 6, electronic control housing 7; Reducer housing 3: main housing 31, cover 32, water channel 33, output shaft installation area A, intermediate shaft installation area B and input shaft installation area C; Second oil passage 5: first branch section 51, second branch section 52, third branch section 53, first branch oil passage 511, second branch oil passage 512, first vertical section 521, extension section 522, second vertical section 523, third vertical section 524, first oil hole 5111, second oil hole 5121, third oil hole 5221, fourth oil hole 5241, fifth oil hole 531, sixth oil hole 532; Motor cooling circuit 10, electronically controlled cooling circuit 20; Speed ​​reducer 30: output shaft 301; Motor 40. DETAILED DESCRIPTION

[0018] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0019] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a variety of structural modes and implementation modes that can be replaced by those skilled in the art can be replaced with each other. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction to the technical solution of the invention.

[0020] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to different positions and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0021] It should be noted that Figure 8 and Fig. 9 In order to omit the schematic diagram of the oil cooling circuit and the water cooling circuit behind the housing of the electric drive system, it is equivalent to materializing the oil and cooling water.

[0022] In some embodiments of the present invention, Figure 1-Figure 2 As shown, the reducer oil cooling circuit includes an oil pump 1 and an oil cooler 2, the oil pump 1 is arranged on the inner side of the reducer housing 3, the oil cooler 2 is installed on the outer side of the reducer housing 3, and also includes a first oil passage 4 and a second oil passage 5, the first oil passage 4 connects the oil pump 1 and the oil cooler 2, one end of the second oil passage 5 is connected to the oil cooler 2, and the other end leads to the interior of the reducer housing 3; The reducer housing 3 includes a main housing 31 and a cover 32, and the reducer housing 3 also includes an output shaft installation area A, an intermediate shaft installation area B and an input shaft installation area C; like Figure 8-Figure 9As shown, the second oil passage 5 includes a first branch segment 51, a second branch segment 52 and a third branch segment 53. The first branch segment 51 is arranged in the main housing 31, the second branch segment 52 is arranged in the cover 32, and the third branch segment 53 is arranged between the main housing 31 and the cover 32. One end of the first branch segment 51 is connected to the oil cooler 2, and the other end is connected to one end of the second branch segment 52. The other end of the second branch segment 52 is connected to one end of the third branch segment 53, and the other end of the third branch segment 53 is connected to the main housing 31. The first branch segment 51 is arranged above the output shaft mounting area A of the reducer housing 3, the second branch segment 52 is arranged above the output shaft mounting area A and the intermediate shaft mounting area B, and the third branch segment 53 is arranged above between the intermediate shaft mounting area B and the input shaft mounting area C.

[0023] Specifically, Figure 1 As shown, the electric drive system includes a reducer housing 3, a motor housing 6 and an electric control housing 7. The reducer housing 3 is located on one side of the motor housing 6, and the electric control housing 7 is located above the motor housing 6. The reducer housing 3 includes a main housing 31 and a cover 32. The main housing 31 and the motor housing 6 are integrally formed. The cover 32 is connected to the main housing 31 by multiple bolts. The cavity formed between the cover 32 and the main housing 31 is used to install the reducer 30 (see Figure 8 ).

[0024] like Figure 2 As shown, the oil pump 1 is installed at the inner bottom of the main housing 31. The oil pump 1 is used to pump the oil at the bottom of the reducer housing 3 into the oil cooler 2. The oil cooler 2 is installed on the outer surface of the main housing 31. The oil cooler 2 is used to cool the oil and then input the cooled oil into various parts of the reducer housing 3 for active cooling.

[0025] like Figure 3 As shown, the oil pump 1 pumps the oil into the oil cooler 2 through the first oil passage 4. Figure 2 As shown, the oil cooled by the oil cooler 2 enters the reducer housing 3 through the second oil passage 5 .

[0026] like Figure 8 As shown, the second oil passage 5 includes a first branch section 51, a second branch section 52 and a third branch section 53. Figure 3 As shown, the first branch section 51 is disposed in the main housing 31 , and the first branch section 51 is arranged above the output shaft installation area A of the reducer housing 3 .

[0027] like Figure 6 As shown, the second branch section 52 is provided in the cover 32 , and the second branch section 52 is arranged above the output shaft installation area A and the intermediate shaft installation area B.

[0028] like Figure 3As shown, the third branch section 53 is disposed between the main housing 31 and the cover 32 , and the third branch section 53 is arranged above between the intermediate shaft installation area B and the input shaft installation area C.

[0029] The main housing 31 and the cover 32 of the reducer housing 3 both include an output shaft installation area A, an intermediate shaft installation area B and an input shaft installation area C, and are arranged correspondingly for installing the output shaft system, the intermediate shaft system and the input shaft system.

[0030] like Figure 8 As shown, the first branch section 51, the second branch section 52 and the third branch section 53 are connected in sequence, and are used to deliver the cooled oil to various parts of the reducer 30, thereby increasing the active cooling of the reducer 30. After the oil cools the reducer 30, it flows into the bottom of the reducer housing 3, and is pumped into the oil cooler 2 by the oil pump 1 for cooling again, and the cycle is repeated to achieve the repeated cooling of the reducer 30.

[0031] like Figure 1 As shown, the reducer oil cooling circuit in this embodiment is all arranged inside the reducer housing 3, which is beneficial to the lightweight and integration of the reducer housing 3. No external oil cooling pipeline is required, making the overall structure of the electric drive system compact, which is beneficial to improving the overall performance of the electric drive system.

[0032] Furthermore, if Figure 8-Figure 9 As shown, the first branch section 51 extends along the width direction of the main housing 31, and the first branch section 51 includes a first branch oil circuit 511 and a second branch oil circuit 512. The first branch oil circuit 511 extends in a direction away from the cover 32, and the second branch oil circuit 512 extends in a direction close to the cover 32. A first oil hole 5111 is provided on the first branch oil circuit 511, and a second oil hole 5121 is provided on the second branch oil circuit 512. The first oil hole 5111 leads to the intermediate shaft installation area B, and the second oil hole 5121 leads to the output shaft installation area A.

[0033] Specifically, Fig. 9 As shown, the first branch section 51 divides into two oil circuits, the first branch oil circuit 511 extends toward the left side of the oil cooler 2 to the intermediate shaft installation area B, and sprays oil into the intermediate shaft installation area B through the first oil hole 5111. The second branch oil circuit 512 extends toward the right side of the oil cooler 2.

[0034] like Figure 4 As shown, a second oil hole 5121 is provided on the second branch oil passage 512 , and the second oil hole 5121 leads to the output shaft installation area A.

[0035] The arrangement of the first branch section 51 enables the output shaft mounting region A and the intermediate shaft mounting region B to be actively cooled.

[0036] Preferably, the first oil hole 5111 is opened at the intermediate shaft bearing installation position of the intermediate shaft installation area B.

[0037] Preferably, the second oil hole 5121 corresponds to the meshing position of the output shaft gear and the intermediate shaft gear.

[0038] Furthermore, if Figure 8-Figure 9 As shown, the second branch section 52 includes a first vertical section 521, an extension section 522 and a second vertical section 523 in sequence. The first vertical section 521 is along the width direction of the cover 32 and is connected to the second branch oil passage 512. The extension section 522 is along the length direction of the cover 32. The second vertical section 523 is along the width direction of the cover 32 and is connected to the third branch section 53. The extension section 522 is provided with a third oil hole 5221 (see Figure 7 ), the third oil hole 5221 leads to the intermediate shaft installation area B.

[0039] Specifically, the first vertical section 521, the extension section 522 and the second vertical section 523 are connected in sequence to form a "door" shape. The first vertical section 521 is connected to the second branch oil circuit 512, and the second vertical section 523 is connected to the third branch section 53, thereby connecting the entire reducer oil cooling circuit in series.

[0040] Figure 6 On the outer side of the cover 32 , the protruding contour of the second branch section 52 can be seen. Figure 7 The inner side of the cover 32 shows the interface of the second branch section 52 and the third branch section 53 plugged into the cover 32 .

[0041] The extension section 522 is provided with a third oil hole 5221 , which leads to the intermediate shaft installation area B, and can actively cool the intermediate bearing.

[0042] Furthermore, if Figure 8-Figure 9 As shown, the second branch section 52 further includes a third vertical section 524, one end of the third vertical section 524 is connected to the first vertical section 521, and the other end is connected to the output shaft 301 of the reducer 30 (see Figure 4 ) is connected to the central through hole of the third vertical section 524, and the third vertical section 524 is perpendicular to the first vertical section 521, and a fourth oil hole 5241 is provided on the third vertical section 524 (see Figure 7 ), the fourth oil hole 5241 leads to the output shaft installation area A.

[0043] Among them, since the output shaft 301 is connected to the rotor shaft of the motor 40, oil can be input into the rotor shaft of the motor 40 through the third vertical section 524 and the output shaft 301. When the rotor shaft rotates, the oil is input into the rotor to cool the rotor of the motor 40.

[0044] In addition, the fourth oil hole 5241 provided on the third vertical section 524 leads to the output shaft installation area A, so that the output bearing can be actively cooled.

[0045] Furthermore, if Figure 5 As shown, the third branch section 53 includes a fifth oil hole 531 and a sixth oil hole 532 . The fifth oil hole 531 leads to the input shaft installation area C, and the sixth oil hole 532 leads to the intermediate shaft installation area B.

[0046] Specifically, the fifth oil hole 531 is close to one side of the cover 32 , and the sixth oil hole 532 is close to one side of the main housing 31 .

[0047] like Fig. 9 As shown, the sixth oil hole 532 leads to the top of the intermediate shaft gear, and the oil drops onto the intermediate shaft gear to cool the meshing portion between the intermediate shaft gear and the output shaft gear.

[0048] The fifth oil hole 531 drips onto the input shaft gear to cool the meshing portion between the input shaft gear and the intermediate shaft gear.

[0049] Through the arrangement of the reducer oil cooling circuit in this embodiment, active cooling of each bearing and gear in the reducer can be achieved, so that the cooling position is more accurate and the cooling effect is better. In addition, since the reducer oil cooling circuit is arranged inside the reducer housing, it is conducive to the lightweight and high integration of the reducer housing, and the overall performance of the electric drive system can be improved.

[0050] In some other embodiments of the present invention, Figure 8-Figure 9 As shown, the electric drive system cooling assembly includes a motor cooling circuit 10 and an electronic control cooling circuit 20, including the reducer oil cooling circuit in any of the above embodiments.

[0051] Specifically, Figure 8 As shown, the first branch oil circuit 511 is directly connected to the motor cooling circuit 10, and the oil is input into the motor cooling circuit 10, and the motor cooling circuit 10 cools the stator and bearings of the motor.

[0052] Furthermore, if Figure 8 As shown, the oil cooler 2 is connected to the electronically controlled cooling circuit 20. Figure 2 As shown, a water channel 33 is provided on the main housing 31, and the oil cooler 2 is connected to the electronic control cooling circuit 20 through the water channel 33. The electronic control cooling circuit 20 is water-cooled, and the cooling water first cools the oil in the oil cooler 2, then flows into the electronic control cooling circuit 20 to cool the motor controller, and finally flows into the water cooling system of the whole vehicle for circulation.

[0053] In this embodiment, the motor cooling circuit 10 is connected to the reducer oil cooling circuit, and the oil cooler 2 is connected to the electronic control cooling circuit 20, so as to jointly realize the cooling of the entire electric drive system.

[0054] like Figure 1 As shown, there is no external cooling pipeline outside the entire electric drive system, the motor cooling circuit 10 is arranged in the motor housing 6, and the electric control cooling circuit 20 is arranged in the electric control housing 7. The entire electric drive system is lightweight and highly integrated, which can improve the performance of the electric drive system.

[0055] The above description is only the principle and preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this field, several other modifications can be made based on the principle of the present invention, which should also be considered as the protection scope of the present invention.

Claims

1. A reducer oil cooling circuit, comprising an oil pump and an oil cooler, wherein the oil pump is arranged on the inner side of the reducer housing, and the oil cooler is installed on the outer side of the reducer housing, characterized in that: It also includes a first oil passage and a second oil passage, wherein the first oil passage connects the oil pump and the oil cooler, and one end of the second oil passage is connected to the oil cooler and the other end leads to the interior of the reducer housing; The reducer housing includes a main housing and a cover, and the reducer housing also includes an output shaft installation area, an intermediate shaft installation area and an input shaft installation area; The second oil passage includes a first branch segment, a second branch segment and a third branch segment, the first branch segment is arranged in the main housing, the second branch segment is arranged in the cover, the third branch segment is arranged between the main housing and the cover, one end of the first branch segment is connected to the oil cooler, and the other end is connected to one end of the second branch segment, the other end of the second branch segment is connected to one end of the third branch segment, and the other end of the third branch segment is connected to the main housing, the first branch segment is arranged above the output shaft mounting area of ​​the reducer housing, the second branch segment is arranged above the output shaft mounting area and the intermediate shaft mounting area, and the third branch segment is arranged above between the intermediate shaft mounting area and the input shaft mounting area.

2. The reducer oil cooling circuit according to claim 1, characterized in that: The first branch section extends along the width direction of the main housing, and the first branch section includes a first branch oil circuit and a second branch oil circuit. The first branch oil circuit extends in a direction away from the cover, and the second branch oil circuit extends in a direction close to the cover. A first oil hole is provided in the first branch oil circuit, and a second oil hole is provided in the second branch oil circuit. The first oil hole leads to the intermediate shaft installation area, and the second oil hole leads to the output shaft installation area.

3. The reducer oil cooling circuit according to claim 2, characterized in that: The first oil hole is opened at the intermediate shaft bearing installation position in the intermediate shaft installation area.

4. The reducer oil cooling circuit according to claim 2, characterized in that: The second oil hole corresponds to the meshing position between the output shaft gear and the intermediate shaft gear.

5. The reducer oil cooling circuit according to claim 2, characterized in that: The second branch segment includes a first vertical segment, an extension segment and a second vertical segment in sequence, the first vertical segment is along the width direction of the cover and is connected to the second branch oil circuit, the extension segment is along the length direction of the cover, the second vertical segment is along the width direction of the cover and is connected to the third branch segment, the extension segment is provided with a third oil hole, and the third oil hole leads to the intermediate shaft installation area.

6. The reducer oil cooling circuit according to claim 5, characterized in that: The second branch segment also includes a third vertical segment, one end of the third vertical segment is connected to the first vertical segment, and the other end is connected to the central through hole of the output shaft of the reducer, and the third vertical segment is perpendicular to the first vertical segment. A fourth oil hole is provided on the third vertical segment, and the fourth oil hole leads to the output shaft installation area.

7. The reducer oil cooling circuit according to claim 1, characterized in that: The third branch section includes a fifth oil hole and a sixth oil hole. The fifth oil hole leads to the input shaft installation area, and the sixth oil hole leads to the intermediate shaft installation area.

8. An electric drive system cooling assembly, comprising a motor cooling circuit and an electric control cooling circuit, characterized in that: It comprises the reducer oil cooling circuit as described in any one of claims 1 to 7.

9. The electric drive system cooling assembly according to claim 8, characterized in that: The first branch oil circuit is in communication with the motor cooling circuit.

10. The electric drive system cooling assembly according to claim 8, characterized in that: The oil cooler is in communication with the electronically controlled cooling circuit.

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