Retarder oil cooling circuit and electric drive system cooling assembly

Abstract

The application discloses a reducer oil cooling circuit, which comprises a first oil channel and a second oil channel, the first oil channel is connected with an oil pump and an oil cooler, one end of the second oil channel is connected with the oil cooler, and the other end is connected with the inside of a reducer shell; the second oil channel comprises a first branch, a second branch and a third branch, the first branch is arranged in a main shell, the second branch is arranged in a cover, and the third branch is arranged between the main shell and the cover; one end of the first branch is connected with the oil cooler, the other end is connected with one end of the second branch, the other end of the second branch is connected with one end of the third branch, and the other end of the third branch is connected with the main shell; the first branch is arranged above an output shaft mounting area of the reducer shell, the second branch is arranged above the output shaft mounting area and an intermediate shaft mounting area, and the third branch is arranged above the intermediate shaft mounting area and an input shaft mounting area. The application can improve the integration and light weight of an electric drive system and improve the overall performance of the electric drive system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy vehicles, and particularly relates to a reducer oil cooling circuit and an electric drive system cooling assembly. BACKGROUND

[0002] With the continuous progress of new energy vehicle technology, the electric drive system has higher and higher requirements for heat dissipation performance. Oil cooling, with its high heat dissipation capacity, has become one of the key technologies to improve the performance of the electric machine. Oil cooling directly cools the heat source inside the electric machine and the reducer through oil, and compared with the water cooling scheme, oil cooling can more effectively reduce the thermal resistance and improve the heat dissipation efficiency, thereby ensuring the stable operation of the electric machine at high power and high speed.

[0003] With the requirements of light weight and integration of the electric drive system, the requirement for optimizing the structure design of the oil cooling circuit in the electric drive system is also increased. Therefore, it is necessary to design a reducer oil cooling circuit and an electric drive system cooling assembly capable of improving the integration and light weight of the electric drive system and improving the overall performance of the electric drive system. SUMMARY

[0004] The present application aims to overcome the shortcomings of the prior art and provide a reducer oil cooling circuit and an electric drive system cooling assembly capable of improving the integration and light weight of the electric drive system and improving the overall performance of the electric drive system.

[0005] The technical scheme of the present application provides a reducer oil cooling circuit, which comprises an oil pump and an oil cooler, the oil pump is arranged on the inner side of a reducer housing, the oil cooler is mounted on the outer side of the reducer housing, and further comprises a first oil passage and a second oil passage, the first oil passage connects the oil pump and the oil cooler, one end of the second oil passage is connected to the oil cooler, and the other end of the second oil passage is connected to the inside of the reducer housing.

[0006] The reducer housing comprises a main housing and a cover, and further comprises an output shaft mounting area, an intermediate shaft mounting area and an input shaft mounting area.

[0007] The second oil passage comprises a first branch, a second branch and a third branch, the first branch is arranged in the main housing, the second branch is arranged in the cover, and the third branch is arranged between the main housing and the cover, one end of the first branch is connected to the oil cooler, the other end of the first branch is connected to one end of the second branch, the other end of the second branch is connected to one end of the third branch, the other end of the third branch is connected to the main housing, the first branch is arranged above the output shaft mounting area of the reducer housing, the second branch is arranged above the output shaft mounting area and the intermediate shaft mounting area, and the third branch is arranged above the intermediate shaft mounting area and the input shaft mounting area.

[0008] Further, the first branch section extends along a width direction of the main housing, the first branch section includes a first branch oil path and a second branch oil path, the first branch oil path extends towards a direction away from the cover, the second branch oil path extends towards a direction close to the cover, the first branch oil path is provided with a first oil hole, the second branch oil path is provided with a second oil hole, the first oil hole opens into the intermediate shaft mounting area, and the second oil hole opens into the output shaft mounting area.

[0009] Further, the first oil hole is arranged at an intermediate shaft bearing mounting position of the intermediate shaft mounting area.

[0010] Further, the second oil hole corresponds to a meshing position of an output shaft gear and an intermediate shaft gear.

[0011] Further, the second branch section includes a first vertical section, an extension section and a second vertical section in sequence, the first vertical section extends along a width direction of the cover and is connected with the second branch oil path, the extension section extends along a length direction of the cover, the second vertical section extends along a width direction of the cover and is connected with the third branch section, the extension section is provided with a third oil hole, and the third oil hole opens into the intermediate shaft mounting area.

[0012] Further, the second branch section further includes a third vertical section, one end of the third vertical section is connected with the first vertical section, the other end of the third vertical section is connected with a center through hole of an output shaft of the reducer, the third vertical section is perpendicular to the first vertical section, the third vertical section is provided with a fourth oil hole, and the fourth oil hole opens into the output shaft mounting area.

[0013] Further, the third branch section includes a fifth oil hole and a sixth oil hole, the fifth oil hole opens into the input shaft mounting area, and the sixth oil hole opens into the intermediate shaft mounting area.

[0014] The application further provides an electric drive system cooling assembly, which includes a motor cooling circuit and an electric control cooling circuit, and includes the above-mentioned reducer oil cooling circuit.

[0015] Further, the first branch oil path is communicated with the motor cooling circuit.

[0016] Further, the oil cooler is communicated with the electric control cooling circuit.

[0017] After the above technical solution is adopted, the following beneficial effects are achieved:

[0018] The reducer oil cooling circuit is arranged in the reducer shell in the application, oil can be actively sprayed into each area inside the reducer, and active oil cooling of the reducer is realized. Since the reducer oil cooling circuit is arranged inside the reducer shell, the weight and integration of the reducer shell are facilitated, external oil cooling pipelines are not needed, the overall structure of the electric drive system is compact, and the overall performance of the electric drive system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] The disclosure of the application will become more apparent from the following description with reference to the drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of the application. In the drawings:

[0020] Figure 1 is a perspective view of an electric drive system in an embodiment of the application;

[0021] Figure 2 is an exploded view of the electric drive system in an embodiment of the application, omitting the cover;

[0022] Figure 3 is a schematic view of the internal structure of the main shell in an embodiment of the application;

[0023] Figure 4 is an enlarged view of the local structure of the main shell in an embodiment of the application Figure 1 ;

[0024] Figure 5 is an enlarged view of the local structure of the main shell in an embodiment of the application Figure 2 ;

[0025] Figure 6 is a schematic view of the outer side of the cover in an embodiment of the application;

[0026] Figure 7 is a schematic view of the inner side of the cover in an embodiment of the application;

[0027] Figure 8 is a perspective view of the electric drive system cooling assembly in an embodiment of the application;

[0028] Figure 9 is a top view of the electric drive system cooling assembly in an embodiment of the application.

[0029] Correspondence table of reference signs:

[0030] Oil pump 1, oil cooler 2, first oil passage 4, motor shell 6, electric control shell 7;

[0031] Reducer shell 3: main shell 31, cover 32, water passage 33, output shaft mounting area A, intermediate shaft mounting area B, and input shaft mounting area C;

[0032] The second oil passage 5 comprises a first branch 51, a second branch 52, a third branch 53, a first branch oil passage 511, a second branch oil passage 512, a first vertical section 521, an extension section 522, a second vertical section 523, a third vertical section 524, a first oil hole 5111, a second oil hole 5121, a third oil hole 5221, a fourth oil hole 5241, a fifth oil hole 531, and a sixth oil hole 532.

[0033] The motor cooling circuit 10 and the electric control cooling circuit 20;

[0034] The reducer 30 comprises an output shaft 301.

[0035] The motor 40. DETAILED DESCRIPTION

[0036] The specific embodiments of the present application will be further described in conjunction with the accompanying drawings.

[0037] It is easily understood that, according to the technical solution of the present application, a person skilled in the art can replace various structural modes and implementation modes with each other without changing the essential spirit of the present application. Therefore, the following specific embodiments and the accompanying drawings are only exemplary descriptions of the technical solution of the present application, and should not be regarded as the whole or as a limitation or restriction on the technical solution of the present application.

[0038] In this specification, the orientation terms such as up, down, left, right, front, back, front surface, back surface, top, bottom, etc. mentioned or possibly mentioned are defined with respect to the structure shown in the drawings, and they are relative concepts, so they can be changed accordingly according to different positions and different use states. Therefore, these or other orientation terms should not be interpreted as restrictive terms.

[0039] It should be noted that, Figure 8 and Figure 9 The schematic diagram of the oil cooling circuit and the water cooling circuit after the shell of the electric drive system is removed, which is equivalent to the solidification of oil and cooling water.

[0040] In some embodiments of the present application, as shown in Figures 1-2 The reducer oil cooling circuit comprises an oil pump 1 and an oil cooler 2, the oil pump 1 is arranged on the inner side of a reducer shell 3, the oil cooler 2 is installed on the outer side of the reducer shell 3, and the reducer oil cooling circuit further comprises 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 is connected to the inside of the reducer shell 3.

[0041] The reducer shell 3 comprises a main shell 31 and a cover 32, and the reducer shell 3 further comprises an output shaft mounting area A, an intermediate shaft mounting area B, and an input shaft mounting area C.

[0042] AsFigures 8-9 As shown, the second oil passage 5 includes a first branch 51, a second branch 52, and a third branch 53. The first branch 51 is disposed in the main housing 31, the second branch 52 is disposed in the cover 32, and the third branch 53 is disposed between the main housing 31 and the cover 32. One end of the first branch 51 is connected to the oil cooler 2, and the other end is connected to one end of the second branch 52. The other end of the second branch 52 is connected to one end of the third branch 53, and the other end of the third branch 53 is connected to the main housing 31. The first branch 51 is arranged above the output shaft mounting area A of the reducer housing 3, the second branch 52 is arranged above the output shaft mounting area A and the intermediate shaft mounting area B, and the third branch 53 is arranged above the area between the intermediate shaft mounting area B and the input shaft mounting area C.

[0043] Specifically, such as Figure 1 As shown, the electric drive system includes a reducer housing 3, a motor housing 6, and an electronic control housing 7. The reducer housing 3 is located to one side of the motor housing 6, and the electronic 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 is integrally formed with the motor housing 6, and 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 ).

[0044] like Figure 2 As shown, the oil pump 1 is installed on 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 side 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.

[0045] like Figure 3 As shown, oil pump 1 pumps oil into oil cooler 2 through 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.

[0046] like Figure 8 As shown, the second oil passage 5 includes a first branch 51, a second branch 52, and a third branch 53. Wherein, as... Figure 3 As shown, the first support section 51 is disposed in the main housing 31, and the first support section 51 is arranged above the output shaft mounting area A of the reducer housing 3.

[0047] like Figure 6 As shown, the second branch 52 is disposed in the cover 32, and the second branch 52 is arranged above the output shaft mounting area A and the intermediate shaft mounting area B.

[0048] like Figure 3As shown, the third branch section 53 is arranged between the main housing 31 and the cover 32, and is arranged above the intermediate shaft mounting area B and the input shaft mounting area C.

[0049] The main housing 31 and the cover 32 of the reducer housing 3 each include an output shaft mounting area A, an intermediate shaft mounting area B, and an input shaft mounting area C, and are arranged correspondingly.

[0050] As shown, Figure 8 The first branch section 51, the second branch section 52, and the third branch section 53 are sequentially communicated, so that the oil that has been cooled can be transported to each part 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 by the oil pump 1 into the oil cooler 2 for cooling, and so on, thereby achieving repeated cooling of the reducer 30.

[0051] As shown, Figure 1 The reducer oil cooling circuit in the embodiment is arranged entirely inside the reducer housing 3, which is conducive to the lightweight and integration of the reducer housing 3, and does not require external oil cooling pipelines, so that the overall structure of the electric drive system is compact, and the overall performance of the electric drive system is improved.

[0052] Further, as shown, Figures 8-9 The first branch section 51 extends along the width direction of the main housing 31, and includes a first branch oil passage 511 and a second branch oil passage 512. The first branch oil passage 511 extends away from the cover 32, and the second branch oil passage 512 extends toward the cover 32. The first branch oil passage 511 is provided with a first oil hole 5111, and the second branch oil passage 512 is provided with a second oil hole 5121. The first oil hole 5111 opens into the intermediate shaft mounting area B, and the second oil hole 5121 opens into the output shaft mounting area A.

[0053] Specifically, as shown, Figure 9 The first branch section 51 divides into two oil passages. The first branch oil passage 511 extends to the intermediate shaft mounting area B toward the left side of the oil cooler 2, and sprays oil into the intermediate shaft mounting area B through the first oil hole 5111. The second branch oil passage 512 extends toward the right side of the oil cooler 2.

[0054] As shown, Figure 4 The second branch oil passage 512 is provided with a second oil hole 5121, and the second oil hole 5121 opens into the output shaft mounting area A.

[0055] The arrangement of the first branch section 51 can actively cool the output shaft mounting area A and the intermediate shaft mounting area B.

[0056] Preferably, the first oil hole 5111 is arranged at the middle shaft bearing mounting position of the middle shaft mounting area B.

[0057] Preferably, the second oil hole 5121 is arranged at the meshing position of the output shaft gear and the middle shaft gear.

[0058] Further, as shown in the figure, the second branch 52 comprises a first vertical segment 521, an extension segment 522 and a second vertical segment 523 in sequence, the first vertical segment 521 is arranged along the width direction of the cover 32 and connected with the second branch oil passage 512, the extension segment 522 is arranged along the length direction of the cover 32, the second vertical segment 523 is arranged along the width direction of the cover 32 and connected with the third branch 53, and the extension segment 522 is provided with a third oil hole 5221 (see the figure) which penetrates into the middle shaft mounting area B. Figures 8-9 Figure 7 Further, as shown in the figure, the second branch 52 comprises a first vertical segment 521, an extension segment 522 and a second vertical segment 523 in sequence, the first vertical segment 521 is arranged along the width direction of the cover 32 and connected with the second branch oil passage 512, the extension segment 522 is arranged along the length direction of the cover 32, the second vertical segment 523 is arranged along the width direction of the cover 32 and connected with the third branch 53, and the extension segment 522 is provided with a third oil hole 5221 (see the figure) which penetrates into the middle shaft mounting area B.

[0059] Specifically, the first vertical segment 521, the extension segment 522 and the second vertical segment 523 are connected in sequence to form a "door" shape, the first vertical segment 521 is connected with the second branch oil passage 512, and the second vertical segment 523 is connected with the third branch 53, so as to connect the entire reducer oil cooling circuit in series.

[0060] Figure 6 For the outer side of the cover 32, the profile of the second branch 52 can be seen. Figure 7 For the inner side of the cover 32, the interface of the second branch 52 and the insertion of the third branch 53 on the cover 32 can be seen.

[0061] Further, as shown in the figure, the second branch 52 further comprises a third vertical segment 524, one end of the third vertical segment 524 is connected with the first vertical segment 521, the other end is connected with the central through hole of the output shaft 301 (see the figure) of the reducer 30, and the third vertical segment 524 is perpendicular to the first vertical segment 521, the third vertical segment 524 is provided with a fourth oil hole 5241 (see the figure) which penetrates into the output shaft mounting area A.

[0062] Further, as shown in the figure, the second branch 52 further comprises a third vertical segment 524, one end of the third vertical segment 524 is connected with the first vertical segment 521, the other end is connected with the central through hole of the output shaft 301 (see the figure) of the reducer 30, and the third vertical segment 524 is perpendicular to the first vertical segment 521, the third vertical segment 524 is provided with a fourth oil hole 5241 (see the figure) which penetrates into the output shaft mounting area A. Figures 8-9 Figure 4 Further, as shown in the figure, the second branch 52 further comprises a third vertical segment 524, one end of the third vertical segment 524 is connected with the first vertical segment 521, the other end is connected with the central through hole of the output shaft 301 (see the figure) of the reducer 30, and the third vertical segment 524 is perpendicular to the first vertical segment 521, the third vertical segment 524 is provided with a fourth oil hole 5241 (see the figure) which penetrates into the output shaft mounting area A. Figure 7

[0063] Further, as shown in the figure, the second branch 52 further comprises a third vertical segment 524, one end of the third vertical segment 524 is connected with the first vertical segment 521, the other end is connected with the central through hole of the output shaft 301 (see the figure) of the reducer 30, and the third vertical segment 524 is perpendicular to the first vertical segment 521, the third vertical segment 524 is provided with a fourth oil hole 5241 (see the figure) which penetrates into the output shaft mounting area A.

[0064] ​​​In addition, the fourth oil hole 5241 arranged on the third vertical section 524 is communicated to the output shaft mounting area A, and the output bearing can be actively cooled.

[0065] Further, as shown in Figure 5 The third branch section 53 includes a fifth oil hole 531 and a sixth oil hole 532, the fifth oil hole 531 is communicated to the input shaft mounting area C, and the sixth oil hole 532 is communicated to the intermediate shaft mounting area B.

[0066] 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.

[0067] As shown in Figure 9 The sixth oil hole 532 is communicated to the upper side of the intermediate shaft gear, and the oil falls on the intermediate shaft gear to cool the meshing part of the intermediate shaft gear and the output shaft gear.

[0068] The fifth oil hole 531 drips into the input shaft gear to cool the meshing part between the input shaft gear and the intermediate shaft gear.

[0069] Through the arrangement of the reducer oil cooling circuit in the embodiment, active cooling of each bearing and gear in the reducer can be realized, the cooling position is more accurate, and the cooling effect is better. Moreover, since the reducer oil cooling circuit is arranged in the interior of the reducer housing, the light weight and high integration degree of the reducer housing can be facilitated, and the overall performance of the electric drive system can be improved.

[0070] In another embodiment of the application, as shown in Figures 8-9 The electric drive system cooling assembly includes a motor cooling circuit 10 and an electric control cooling circuit 20, and the reducer oil cooling circuit in any of the above embodiments.

[0071] Specifically, as shown in Figure 8 The first branch oil way 511 is directly connected with the motor cooling circuit 10 to input oil into the motor cooling circuit 10, and the motor cooling circuit 10 cools the stator and bearing of the motor.

[0072] Further, as shown in Figure 8 The oil cooler 2 is communicated with the electric control cooling circuit 20. As shown in Figure 2 The main housing 31 is provided with a water channel 33, and the oil cooler 2 is communicated with the electric control cooling circuit 20 through the water channel 33. The electric control cooling circuit 20 is water-cooled, the cooling water first cools the oil in the oil cooler 2, then flows into the electric control cooling circuit 20 to cool the motor controller, and finally flows into the water cooling system of the whole vehicle for circulation.

[0073] In this embodiment, the motor cooling circuit 10 is in communication with the reducer oil cooling circuit, and the oil cooler 2 is in communication with the electric control cooling circuit 20, which together realize the cooling of the entire electric drive system.

[0074] As shown in Figure 1 The entire electric drive system is externally connected without a cooling pipeline, the motor cooling circuit 10 is arranged in the motor shell 6, and the electric control cooling circuit 20 is arranged in the electric control shell 7. The light weight and high integration of the entire electric drive system are realized, and the performance of the electric drive system is improved.

[0075] The above is only the principle and preferred embodiment of the present application. It should be noted that, for those skilled in the art, on the basis of the principles of the present application, several other variations can also be made, which should be considered as the protection scope of the present application.

Claims

1. A reducer oil cooling circuit comprising an oil pump provided on an inner side of a reducer housing and an oil cooler mounted on an outer side of the reducer housing, characterized in that, Further comprising a first oil passage connecting the oil pump and the oil cooler, and a second oil passage having one end connected to the oil cooler and the other end opening into the inside of the reducer housing; The reducer housing comprises a main housing and a cover, and further comprises an output shaft mounting area, an intermediate shaft mounting area and an input shaft mounting area; The second oil passage comprises a first branch, a second branch and a third branch, the first branch is arranged in the main housing, the second branch is arranged in the cover, and the third branch is arranged between the main housing and the cover, one end of the first branch is connected to the oil cooler, the other end is connected to one end of the second branch, the other end of the second branch is connected to one end of the third branch, and the other end of the third branch is connected to the main housing, the first branch is arranged above the output shaft mounting area of the reducer housing, the second branch is arranged above the output shaft mounting area and the intermediate shaft mounting area, and the third branch is arranged above the intermediate shaft mounting area and the input shaft mounting area; The first branch extends along the width direction of the main housing, the first branch comprises a first branch oil passage and a second branch oil passage, the first branch oil passage extends in a direction away from the cover, and the second branch oil passage extends in a direction close to the cover, a first oil hole is arranged on the first branch oil passage, a second oil hole is arranged on the second branch oil passage, the first oil hole opens into the intermediate shaft mounting area, and the second oil hole opens into the output shaft mounting area; The second branch comprises a first vertical section, an extension section and a second vertical section in sequence, the first vertical section extends along the width direction of the cover and is connected to the second branch oil passage, the extension section extends along the length direction of the cover, and the second vertical section extends along the width direction of the cover and is connected to the third branch, a third oil hole is arranged on the extension section, and the third oil hole opens into the intermediate shaft mounting area; The second branch further comprises a third vertical section, one end of the third vertical section is connected to the first vertical section, the other end is connected to a central through hole of the output shaft of the reducer, and the third vertical section is perpendicular to the first vertical section, a fourth oil hole is arranged on the third vertical section, and the fourth oil hole opens into the output shaft mounting area.

2. The oil cooling circuit of the reduction gear according to claim 1, characterized by The first oil hole is arranged at the intermediate shaft bearing mounting position of the intermediate shaft mounting area.

3. The oil cooling circuit of the reduction gear according to claim 1, characterized by The second oil hole corresponds to the meshing position of the output shaft gear and the intermediate shaft gear.

4. The oil cooler circuit for a retarder according to claim 1, characterized in that, The third branch comprises a fifth oil hole and a sixth oil hole, the fifth oil hole opens into the input shaft mounting area, and the sixth oil hole opens into the intermediate shaft mounting area.

5. An electric drive system cooling assembly comprising an electric machine cooling circuit and an electric control cooling circuit, characterized in that, The reducer oil cooling circuit comprises the reducer oil cooling circuit according to any one of claims 1-4.

6. The electric drive system cooling assembly of claim 5, wherein, The first branch oil passage is in communication with the motor cooling circuit.

7. The electric drive system cooling assembly of claim 5, wherein, The oil cooler is in communication with the electronic control cooling circuit.

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