Stator cooling device and electric drive system

Abstract

The utility model discloses a stator cooling device, which comprises an oil injection pipe, the oil injection pipe comprises a main oil duct and oil holes, the main oil duct is arranged in the oil injection pipe along the axial direction of the oil injection pipe, and a plurality of oil holes penetrate out of the main oil duct to the outer wall surface of the oil injection pipe along the radial direction. The oil injection device further comprises a motor end cover, a sealing ring and a sealing cover, one end of the oil injection pipe is connected with the motor end cover through the sealing ring, an oil inlet of the main oil way is communicated with an oil way on the motor end cover, the sealing cover is detachably connected with the motor end cover, and the oil inlet of the main oil way is exposed after the sealing cover is detached. The utility model further discloses an electric drive system. The angle of the oil injection pipe can be adjusted conveniently, installation is convenient, and when the oil injection pipe is plugged, the assembly does not need to be disassembled, and operation can be achieved only by disassembling the sealing cover.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of motor cooling device especially relates to a stator cooling device and electric drive system. BACKGROUND

[0002] The electric drive system includes driving motor and generator, in order to guarantee the normal operation of motor, need cooling to motor's rotor and stator. Among them, the stator of motor usually adopts oil injection pipe, and oil is sprayed on the stator for cooling. The existing oil injection pipe is difficult to install, and the oil injection angle cannot be adjusted after installation.

[0003] The stator of double motor needs multiple oil injection pipes to cool respectively in different parts of double motor. However, when only one motor needs to be cooled, the existing method needs to disassemble the assembly to block the oil injection pipe of the motor that does not need to be cooled. However, this method is complex to operate and takes more time.

[0004] Therefore, it is necessary to design a stator cooling device and electric drive system which is easy to install, angle-adjustable and easy to block. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming the insufficient prior art, and provides a stator cooling device and electric drive system which is easy to install, angle-adjustable and easy to block.

[0006] The utility model discloses a technical scheme provides a kind of stator cooling device, including oil injection pipe, the oil injection pipe includes main oil passage and oil hole, the main oil passage is along the axial direction of the oil injection pipe and is arranged in the inside of the oil injection pipe, multiple oil holes are radially from the main oil passage to the outer wall surface of the oil injection pipe, further including motor end cover, sealing ring and sealing cover, one end of the oil injection pipe is connected with the motor end cover by sealing ring, the oil inlet of the main oil passage is communicated with the oil way on the motor end cover, the sealing cover is detachably connected with the motor end cover, the oil inlet of the main oil passage is exposed after the sealing cover is detached.

[0007] Further, the motor end cover is provided with a plug-in slot, the plug-in slot includes an oil pipe mounting hole, a sealing ring accommodating cavity, an oil passage communication cavity and a sealing cover mounting cavity from inside to outside in sequence, the oil injection pipe passes through the oil pipe mounting hole, the sealing ring is mounted in the sealing ring accommodating cavity, the oil injection pipe passes through the sealing ring and is closely matched with the sealing ring, the oil inlet is located in the oil passage communication cavity, and the sealing cover is mounted in the sealing cover mounting cavity.

[0008] Further, the sealing cover is axially inserted with one end of the oil injection pipe, and the sealing cover can drive the oil injection pipe to rotate.

[0009] Further, a pointer is arranged on the sealing cover, and a scale is arranged on the outer wall of the sealing cover mounting cavity.

[0010] Further, a hexagonal groove is arranged in the center of the outer wall surface of the sealing cover.

[0011] Further, the oil holes are arranged in multiple rows along the axial direction of the oil injection pipe, each row comprises multiple groups, and each group comprises at least two oil holes.

[0012] The utility model also provides a kind of electric drive system, including electric drive shell, motor rotor, rotor shaft and rotor bearing, the motor rotor is installed on the rotor shaft, the rotor shaft is connected with the electric drive shell by the rotor bearing, still include the stator cooling device of any one of the above, the rotor bearing includes first bearing, second bearing and third bearing, the first bearing is installed in one end of the rotor shaft and located in one side of the motor rotor, the second bearing is installed in the other side of the motor rotor, and the third bearing is installed in the other end of the rotor shaft.

[0013] Further, the electric drive shell includes right shell and left shell, the first bearing chamber is arranged on the left shell, the third bearing chamber is arranged on the right shell, the first bearing is installed in the first bearing chamber, and the third bearing is installed in the third bearing chamber.

[0014] Further, the rotor cooling oil channel is arranged in the center of the rotor shaft along the axial direction, and the rotor cooling oil channel penetrates into the first bearing, the second bearing and the third bearing.

[0015] Further, the oil guide ring is arranged on one end of the rotor shaft, and a small hole is arranged in the center of the oil guide ring.

[0016] After the above technical scheme is adopted, the following beneficial effects are achieved:

[0017] In the utility model, before the oil injection pipe is connected with the motor end cover, the oil injection pipe is first adjusted to a proper angle, and then is sealingly connected with the motor end cover. When it is necessary to block the oil injection pipe, the sealing cover is removed, and then the oil inlet is blocked. The utility model is convenient for adjusting the angle of the oil injection pipe, and is convenient to install. When the oil injection pipe is blocked, the assembly does not need to be disassembled, and only the sealing cover needs to be disassembled to operate. BRIEF DESCRIPTION OF DRAWINGS

[0018] Referring to the drawings, the disclosure of the utility model will become more easily understood. It should be understood that these drawings are only for illustrative purposes, and are not intended to limit the scope of protection of the utility model. In the drawings:

[0019] Figure 1 is the schematic view of the stator cooling device in an embodiment of the utility model;

[0020] Figure 2 is an enlarged view of the oil injection pipe, the sealing ring and the sealing cover in an embodiment of the utility model;

[0021] Figure 3 is a schematic view of the oil injection pipe and the motor end cover connection in an embodiment of the utility model;

[0022] Figure 4 is a sectional view of the oil injection pipe and the motor end cover connection in an embodiment of the utility model;

[0023] Figure 5 is a local enlarged view of the sealing cover and the motor end cover connection in an embodiment of the utility model;

[0024] Figure 6 is a local enlarged view of the sealing cover and the sealing ring in an embodiment of the utility model;

[0025] Figure 7 is a schematic view of the internal structure of the electric drive system in an embodiment of the utility model;

[0026] Figure 8 is a schematic view of the motor in an embodiment of the utility model;

[0027] Figure 9 is a sectional view of the oil guide ring in an embodiment of the utility model;

[0028] Figure 10 is a sectional view of the rotor shaft in an embodiment of the utility model;

[0029] Figure 11 is a local enlarged view of the right shell in an embodiment of the utility model.

[0030] Correspondence table of reference signs:

[0031] Oil injection pipe 1: main oil passage 11, oil hole 12, oil inlet 111;

[0032] Motor end cover 2: plug-in slot 21, oil pipe mounting hole 211, sealing ring accommodating cavity 212, oil passage communication cavity 213, sealing cover mounting cavity 214;

[0033] Sealing ring 3;

[0034] Sealing cover 4: pointer 41, hexagonal recess 42;

[0035] Motor stator 5, motor rotor 6, rotor shaft 7;

[0036] Rotor bearing 8: first bearing 81, second bearing 82, third bearing 83;

[0037] Oil guide ring 9: small hole 91;

[0038] Right housing 10: Third bearing chamber 101, intermediate bearing chamber 102, connecting oil passage 103;

[0039] Left housing 20: First bearing chamber 201. Detailed Implementation

[0040] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0041] It is readily understood that, based on the technical solution of this utility model, various structural and implementation methods can be interchanged by those skilled in the art without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0042] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0043] In some embodiments of this utility model, such as Figures 1-4 As shown, the stator cooling device includes an oil injection pipe 1, which includes a main oil passage 11 and oil holes 12. The main oil passage 11 is along the axial direction of the oil injection pipe 1 and is located inside the oil injection pipe 1. Multiple oil holes 12 extend radially from the main oil passage 11 to the outer wall of the oil injection pipe 1. The device also includes a motor end cover 2, a sealing ring 3, and a sealing cap 4. One end of the oil injection pipe 1 is connected to the motor end cover 2 through the sealing ring 3. The oil inlet 111 of the main oil passage 11 is connected to the oil passage on the motor end cover 2. The sealing cap 4 is detachably connected to the motor end cover 2. After the sealing cap 4 is removed, the oil inlet 111 of the main oil passage 11 is exposed.

[0044] Specifically, such as Figure 1 As shown, Figure 1 It includes two motors, and multiple oil injection pipes 1 are installed on the motor end cover 2, which are distributed at different parts on the outside of the motor stator 5 of the two motors to achieve cooling of the motor stator 5 of the dual motors.

[0045] like Figure 2 As shown, the fuel injection pipe 1 includes two ends, one end ( Figure 2 The right end of the middle section is connected to the motor end cover 2, and the other end ( Figure 2 The left end of the nozzle is connected to the mounting structure inside the motor housing, which serves to stably support the fuel injection pipe 1. The fuel injection pipe 1 is a long strip-shaped pipe with multiple oil holes 12 on its surface. When in use, the oil holes 12 spray oil to cool the motor stator 5.

[0046] As shown in Figure 3 , the black arrow indicates the flow direction of the oil. The oil flows from the oil passage of the motor end cover 2 into the oil injection pipe 1, and is sprayed out from the oil hole 12 of the oil injection pipe 1.

[0047] As shown in Figure 2 and Figure 4 , the sealing ring 3 is installed at the right end of the oil injection pipe 1, and is connected with the motor end cover 2 through the sealing ring 3, and the part of the oil injection pipe 1 located at the right side of the sealing ring 3 is inserted into the inside of the motor end cover 2. Among them, the oil inlet 111 is located at the right side of the sealing ring 3, and the oil inlet 111 is in communication with the oil passage of the motor end cover 2, so that the oil flows from the oil passage of the motor end cover 2 into the main oil channel 11 of the oil injection pipe 1 through the oil inlet 111.

[0048] The sealing cover 4 is located at the right side of the oil inlet 111, and the sealing cover 4 is used to block the right end of the main oil channel 11 and the opening on the outer wall of the motor end cover 2. When the sealing cover 4 is sealingly connected with the motor end cover 2, the oil can only enter the main oil channel 11 from the oil inlet 111, and the oil cannot flow out from the opening on the outer wall of the motor end cover 2. When the motor does not need to be cooled, the sealing cover 4 is opened from the outside of the motor end cover 2, so that the oil inlet 111 is exposed, and the staff inserts a rubber plug or other blocking member into the opening on the motor end cover 2 to block the oil inlet 111, so that the oil cannot enter the main oil channel 11 of the oil injection pipe 1.

[0049] The stator cooling device in the embodiment is assembled first by sleeving the sealing ring 3 on the right end of the oil injection pipe 1, and the sealing ring 3 is located at the left side of the oil inlet 111, and then the left end of the oil injection pipe 1 is inserted into the inside of the motor end cover 2 from the opening of the motor end cover 2. At this time, the sealing ring 3 has not yet cooperated with the motor end cover 2, and the angle between the oil hole 12 and the motor stator 5 is adjusted by rotating the oil injection pipe 1, so that the oil sprayed out of the oil hole 12 can be accurately sprayed onto the motor stator 5. After adjusting to the appropriate angle, the sealing ring 3 is connected with the motor end cover 2, and finally the sealing cover 4 is covered to block the opening of the motor end cover 2.

[0050] The embodiment is convenient for adjusting the angle of the oil injection pipe and easy to install, and when the oil injection pipe is blocked, the assembly does not need to be disassembled, and only the sealing cover needs to be disassembled.

[0051] Further, as shown in Figure 4As shown, the motor end cover 2 is provided with a plug groove 21. The plug groove 21 includes, from the inside out, an oil pipe mounting hole 211, a sealing ring receiving cavity 212, an oil circuit connecting cavity 213, and a sealing cover mounting cavity 214. The oil injection pipe 1 passes through the oil pipe mounting hole 211, the sealing ring 3 is installed in the sealing ring receiving cavity 212, the oil injection pipe 1 passes through the sealing ring 3 and is tightly fitted with the sealing ring 3, the oil inlet 111 is located in the oil circuit connecting cavity 213, and the sealing cover 4 is installed in the sealing cover mounting cavity 214.

[0052] Specifically, the insertion groove 21 extends from the outside to the inside along the thickness direction of the motor end cover 2, and the opening on the aforementioned motor end cover 2 is the location of the sealing cover mounting cavity 214.

[0053] When installing the fuel injection pipe 1, the fuel injection pipe 1 is inserted into the interior of the motor end cover 2 through the fuel pipe mounting hole 211. The diameter of the fuel pipe mounting hole 211 is smaller than the inner diameter of the sealing ring receiving cavity 212. The sealing ring 3 enters the sealing ring receiving cavity 212 and fits tightly with the sealing ring receiving cavity 212. The stepped surface between the fuel pipe mounting hole 211 and the sealing ring receiving cavity 212 prevents the sealing ring 3 from moving axially and positions the relative position of the fuel injection pipe 1 and the motor end cover 2.

[0054] The inner diameter of the oil passage connecting cavity 213 is larger than the inner diameter of the sealing ring receiving cavity 212. The oil passage connecting cavity 213 is connected to the oil passage of the motor end cover 2. The oil inlet 111 is located in the oil passage connecting cavity 213. The oil flows from the oil passage of the motor end cover 2 into the oil passage connecting cavity 213, and then from the oil passage connecting cavity 213 into the oil inlet 111. It enters the main oil passage 11 from the oil inlet 111 and finally sprays out from the oil hole 12.

[0055] The inner diameter of the sealing cover mounting cavity 214 is larger than that of the oil passage connecting cavity 213, forming a stop surface between the sealing cover mounting cavity 214 and the oil passage connecting cavity 213 to limit the position of the sealing cover 4. The sealing cover 4 is detachably connected to the sealing cover mounting cavity 214 and is used to seal the port of the fuel injection pipe 1 and the oil passage connecting cavity 213. When cooling of the motor stator is not required, the sealing cover 4 is removed, exposing the sealing cover mounting cavity 214 and the oil passage connecting cavity 213. The operator uses a rubber plug to seal the oil inlet 111 or the pipeline into the oil passage connecting cavity 213 to prevent oil from entering the main oil passage 11.

[0056] Better, such as Figure 4 As shown, the sealing cover 4 is axially inserted into one end of the fuel injection pipe 1, and the sealing cover 4 can drive the fuel injection pipe 1 to rotate.

[0057] Before the oil injection pipe 1 is assembled with the motor end cover 2, the sealing cover 4 is inserted into the port of the oil injection pipe 1, and then the oil injection pipe 1 is inserted into the motor end cover 2. Before the sealing ring 3 is tightly matched with the motor end cover 2, the rotation of the oil injection pipe 1 is driven by the sealing cover 4, so that the angle adjustment of the oil hole 12 is realized. When the oil hole 12 is adjusted to the position, the sealing cover 4 is completely pressed into the sealing cover mounting cavity 214 in the axial direction, and the sealing ring 3 is also driven into the sealing ring containing cavity 212. When it is required to block the oil inlet 111, since the sealing ring 3 is tightly connected with the motor end cover 2 at this time, the oil injection pipe 1 remains stationary when the sealing cover 4 is opened, and the sealing cover 4 is separated from the oil injection pipe 1.

[0058] Further, as shown in the Figures 5-6 , the sealing cover 4 is provided with a pointer 41, and the outer wall of the sealing cover mounting cavity 214 is provided with a scale.

[0059] When the sealing cover 4 is driven to rotate, the rotation angle of the oil injection pipe 1 can be displayed through the pointer 41 and the scale, which is convenient for the operator to operate.

[0060] Further, as shown in the Figure 5 , a hexagonal groove 42 is formed in the center of the outer wall surface of the sealing cover 4. The hexagonal groove 42 is used for inserting a hexagonal wrench, which is convenient for the operator to operate.

[0061] Preferably, the oil hole 12 is provided with a plurality of rows along the axial direction of the oil injection pipe 1, each row includes a plurality of groups, and each group includes at least two oil holes 12.

[0062] Each group of oil holes 12 corresponds to different parts of the motor stator 5, which can more accurately and efficiently cool the motor stator 5.

[0063] In some embodiments of the utility model, as shown in the Figure 7 , the electric drive system comprises an electric drive shell, a motor rotor 6, a rotor shaft 7 and a rotor bearing 8, the motor rotor 6 is installed on the rotor shaft 7, the rotor shaft 7 is connected with the electric drive shell through the rotor bearing 8, further comprising the stator cooling device of any one of the above, the rotor bearing 8 comprises a first bearing 81, a second bearing 82 and a third bearing 83, the first bearing 81 is installed on one end of the rotor shaft 7 and located on one side of the motor rotor 6, the second bearing 82 is installed on the other side of the motor rotor 6, and the third bearing 83 is installed on the other end of the rotor shaft 7.

[0064] Among them, as shown in the Figure 8 , the first bearing 81 and the second bearing 82 are respectively located on the left and right sides of the motor rotor 6, and the right end of the rotor shaft 7 extends to the right side of the second bearing 82.

[0065] The existing rotor shaft has only two bearings, so that the right end of the rotor shaft is a cantilever structure, resulting in poor NVH performance.

[0066] In this embodiment, a third bearing 83 is added to the right end of the rotor shaft 7, so that the working state of the rotor shaft 7 is more stable, and the NVH performance is improved.

[0067] Further, as shown in Figure 7 , the electric drive shell includes a right shell 10 and a left shell 20, the left shell 20 is provided with a first bearing chamber 201, and the right shell 10 is provided with a third bearing chamber 101, the first bearing 81 is installed in the first bearing chamber 201, and the third bearing 83 is installed in the third bearing chamber 101.

[0068] In this embodiment, the left shell 20 is the front motor end cover 2, which is used to install a plurality of oil injection pipes 1, so that the oil injection pipes 1 can extend into the upper part of the motor stator 5. The first bearing 81 and the third bearing 83 are respectively installed at the left and right ends of the rotor shaft 7, the first bearing 81 is installed in the first bearing chamber 201, and the third bearing 83 is installed in the third bearing chamber 101, so as to realize the stable support of the rotor shaft 7.

[0069] Preferably, the center of the rotor shaft 7 is provided with a rotor cooling oil channel in the axial direction, and the rotor cooling oil channel penetrates into the first bearing 81, the second bearing 82 and the third bearing 83, so as to realize the cooling and lubrication of the three bearings.

[0070] The rotor cooling oil channel realizes the cooling of the motor rotor 6, and part of the oil is brushed onto the motor stator 5 during the rotation of the motor rotor 6, so as to realize the cooling of the inner side of the motor stator 5.

[0071] Further, as shown in Figure 7 and Figure 9 , one end of the rotor shaft 7 is provided with an oil guide ring 9, and a small hole 91 is formed in the center of the oil guide ring 9.

[0072] Specifically, the oil guide ring 9 is installed at the left end of the rotor shaft 7, the inner cavity of the oil guide ring 9 is communicated with the rotor cooling oil channel of the rotor shaft 7, and the center small hole 91 of the oil guide ring 9 enables the oil to enter the first bearing chamber 201, and reduces the oil entering the motor rotor 6, so that more oil can enter the bearings, especially the third bearing 83. Since the heat generation of the motor rotor 6 accounts for a small proportion, it does not affect the cooling of the motor rotor 6.

[0073] Preferably, as shown in Figure 10 , the rotor cooling oil channel 71 of the rotor shaft 7 is a stepped hole, which can reduce the manufacturing difficulty.

[0074] Optionally, as shown in Figure 11As shown, the right shell 10 is further provided with an intermediate bearing chamber 102, and the intermediate bearing chamber 102 and the third bearing chamber 101 are communicated through a communication oil channel 103, and the oil can enter into the intermediate bearing chamber 102 from the third bearing chamber 101 through the communication oil channel 103, so that the bearing lubrication and cooling of the intermediate gear are realized.

[0075] The utility model discloses can realize the cooling and lubrication of motor rotor, motor stator and bearing of electric drive system, and the installation and adjustment of staff are convenient, still have promoted NVH performance. For the electric drive system of double motor, when not needing to cool one motor stator, not needing to disassemble entire assembly, only needing to take down sealing cap, the operation of staff is convenient.

[0076] The above only is the principle and preferable embodiment of the utility model. It should be pointed out, for ordinary skilled person in the art, on the basis of the principle of the utility model, can also make several other variations, also should be regarded as the protection scope of the utility model.

Claims

1. A stator cooling device comprising an oil jet pipe including a main oil passage and oil holes, the main oil passage being provided in the inside of the oil jet pipe in the axial direction of the oil jet pipe, and the oil holes being provided in the outer wall surface of the oil jet pipe in the radial direction from the main oil passage, characterized in that, The motor end cover, the sealing ring and the sealing cover are further included, one end of the oil injection pipe is connected with the motor end cover through the sealing ring, the oil inlet of the main oil passage is communicated with the oil passage on the motor end cover, the sealing cover is detachably connected with the motor end cover, and the oil inlet of the main oil passage is exposed after the sealing cover is detached.

2. The stator cooling arrangement of claim 1, wherein The motor end cover is provided with a plug-in groove, the plug-in groove includes an oil pipe mounting hole, a sealing ring accommodating cavity, an oil passage communication cavity and a sealing cover mounting cavity from inside to outside, the oil injection pipe passes through the oil pipe mounting hole, the sealing ring is mounted in the sealing ring accommodating cavity, the oil injection pipe passes through the sealing ring and is tightly matched with the sealing ring, the oil inlet is located in the oil passage communication cavity, and the sealing cover is mounted in the sealing cover mounting cavity.

3. The stator cooling arrangement of claim 2, characterized in that The sealing cover is axially plugged with one end of the oil injection pipe, and the sealing cover can drive the oil injection pipe to rotate.

4. The stator cooling arrangement of claim 3, wherein The sealing cover is provided with a pointer, and the outer wall of the sealing cover mounting cavity is provided with a scale.

5. The stator cooling arrangement of claim 4, wherein, A hexagonal groove is formed in the center of the outer wall surface of the sealing cover.

6. The stator cooling arrangement of claim 1, wherein The oil holes are arranged in multiple rows along the axial direction of the oil injection pipe, each row includes multiple groups, and each group includes at least two oil holes.

7. An electric drive system comprising an electric drive housing, an electric machine rotor, a rotor shaft and a rotor bearing, the electric machine rotor being mounted on the rotor shaft, the rotor shaft being connected with the electric drive housing via the rotor bearing, characterized in that The stator cooling device of any one of claims 1-6 is further included, the rotor bearing includes a first bearing, a second bearing and a third bearing, the first bearing is installed at one end of the rotor shaft and located on one side of the motor rotor, the second bearing is installed on the other side of the motor rotor, and the third bearing is installed at the other end of the rotor shaft.

8. The electric drive system of claim 7, wherein, The electric drive shell includes a right shell and a left shell, the left shell is provided with a first bearing chamber, the right shell is provided with a third bearing chamber, the first bearing is installed in the first bearing chamber, and the third bearing is installed in the third bearing chamber.

9. The electric drive system of claim 7, wherein, The center of the rotor shaft is provided with a rotor cooling oil passage in the axial direction, and the rotor cooling oil passage penetrates into the first bearing, the second bearing and the third bearing.

10. The electric drive system of claim 9, wherein, One end of the rotor shaft is provided with an oil guide ring, and a small hole is formed in the center of the oil guide ring.

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