Multi-loop rotor cooling oil circuit driving motor
By setting a sleeve in the hollow shaft and setting multiple cooling oil circuits on the rotor, the problem of difficult flow equalization in the multi-loop rotor cooling oil circuit in the prior art is solved, and precise cooling and efficient cooling of the rotor heating area is achieved, thus reducing system costs.
Patent Information
- Application Number
- CN202421842220.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-07-31
AI Technical Summary
The existing multi-loop rotor cooling oil circuit is difficult to achieve flow balance within the motor's full speed range, and the cooling effectiveness and accuracy are insufficient. The immutable rotor oil circuit needs to improve cooling capacity, resulting in high system prices and low economic performance.
A multi-circuit rotor cooling oil circuit drive motor is designed. By setting a sleeve in the hollow shaft and two cooling oil circuits are set on the rotor. The sleeve controls axial movement by pushing the assembly, opening or closing the cooling oil circuit, and actively cools the rotor heating area.
Accurate cooling of the rotor heating area at different speeds is achieved, cooling efficiency is improved, oil diversion is avoided, and the cost of the cooling system is reduced.
Smart Images
Figure CN222868630U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motors, in particular to a multi-circuit rotor cooling oil circuit drive motor. Background Art
[0002] There are generally two forms of oil circuits for oil-cooled motor rotors. One is through small holes on the shaft and is directly thrown to the windings under the action of rotational speed. The other is through small holes on the shaft, end plates and iron cores, and under the action of rotational speed, the oil flows through a local area of the rotor and is thrown to the windings.
[0003] During the operation of the motor, in the low-speed and high-torque part, the copper loss accounts for a large proportion, the stator winding heats up seriously, and needs to be cooled intensively (the stator cooling oil circuit always cools the stator); in the high-speed and low-torque part, the iron loss accounts for a higher proportion, and the rotor core and magnetic steel parts need to be cooled intensively.
[0004] The two oil circuits mentioned above can be arranged at the same time, but due to the large difference in the oil circuit paths and the limitation of the oil pump capacity, it is difficult to achieve balanced flow of the two oil circuits within the full speed range of the motor. The fixed rotor oil circuit cannot be adjusted according to the different working conditions of low speed or high speed mentioned above, and the cooling effectiveness and accuracy are insufficient. In addition, if the fixed rotor oil circuit is forced to meet the demand, the cooling capacity needs to be greatly improved, which means that the price of the cooling system will be greatly increased and the economic cost performance is low. Summary of the invention
[0005] In order to solve the above problems, the purpose of the utility model is to provide a multi-circuit rotor cooling oil circuit drive motor, two rotor cooling oil circuits are arranged on the rotor, and a sleeve is arranged in the hollow shaft. The axial movement position of the sleeve is controlled by pushing the component, and then the corresponding cooling oil circuit is opened or closed, so as to actively cool the heating area of the rotor and improve the cooling efficiency.
[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:
[0007] A multi-circuit rotor cooling oil circuit drive motor comprises a stator and a rotor, wherein the rotor comprises a rotating shaft and a rotor core assembly sleeved on the rotating shaft, and the stator comprises a stator core arranged outside the rotor core assembly, and a stator coil assembled on the stator core, wherein the rotating shaft is a hollow shaft, an oil inlet channel is formed inside one side of the hollow shaft, a push assembly is arranged on the other side of the hollow shaft, and an axial cavity communicating with the oil inlet channel is formed inside the hollow shaft;
[0008] Two cooling oil circuits are constructed on the rotor, and the oil inlet of the cooling oil circuit is arranged on the inner wall of the shaft cavity, and the oil outlet of the cooling oil circuit corresponds to the stator coil; a sleeve is provided in the shaft cavity, and the peripheral wall abuts against the inner wall of the shaft cavity, and a distance is formed between the sleeve and the shaft cavity in the axial direction; one axial side of the sleeve is connected to the oil inlet channel, and one axial side is closed and connected to the pushing component; the sleeve can move axially in the shaft cavity under the action of the pushing component to open the oil inlet of one cooling oil circuit and close the oil inlet of another cooling oil circuit at the same time.
[0009] Preferably, two groups of through holes are provided on the side wall of the sleeve, which can respectively correspond to the oil inlets of the two cooling oil circuits. The sleeve can move axially under the action of a pushing assembly. When one group of through holes corresponds to the oil inlet of one cooling oil circuit, the other group of through holes is misaligned with the oil inlet of the other cooling oil circuit.
[0010] Preferably, at least one first oil hole corresponding to the stator coil is circumferentially opened on both sides of the hollow shaft, and the first oil holes on both sides extend to the shaft cavity to form a first cooling oil path; at least one second oil hole is circumferentially opened on the hollow shaft between the rotor core assembly and the shaft cavity, and a rotor cooling oil channel communicating with the second oil hole is formed on the rotor core assembly, and the second oil hole and the rotor cooling oil channel form a second cooling oil channel; the two groups of through holes include a first through hole and a second through hole corresponding to the first oil hole and the second oil hole, respectively.
[0011] Preferably, the pushing assembly comprises a conductor seat, a coil and a magnet, an axial hole is formed on the side of the hollow shaft opposite to the oil inlet channel, the conductor seat is axially arranged, one end of which is fixed to the end cover, and the other end extends into the axial hole, the coil is wound on the conductor seat, and the magnet is encapsulated at the end of the sleeve and corresponds to the conductor seat;
[0012] When the rotor speed is less than a certain speed, the coil is energized so that the conductor seat attracts the magnet, and the sleeve moves toward the conductor seat until the magnet abuts against the side wall of the shaft cavity, the first through hole corresponds to the first oil hole, and the second through hole is misaligned with the second oil hole;
[0013] When the rotor speed is greater than a certain speed, the coil is energized in the reverse direction so that the conductor seat pushes the magnet away, and the sleeve moves away from the conductor seat until the sleeve is against the other side wall of the shaft cavity, the first through hole is misaligned with the first oil hole, and the second through hole corresponds to the second oil hole.
[0014] Preferably, the pushing assembly comprises a conductor seat, a coil, a return spring, a connecting frame and a connecting bolt; an axial hole is formed on the side of the hollow shaft opposite to the oil inlet channel; the conductor seat is axially arranged, and one end is fixed to the end cover, and the other end extends into the axial hole; the coil is wound on the conductor seat, the return spring is arranged on the outside of the coil, the connecting frame sleeve is partially sleeved on the outside of the conductor seat and interference-fitted in the axial hole, one end of the return spring is connected to the bottom of the conductor seat, and the other end is connected to the connecting frame; an end plate is encapsulated on one side of the sleeve close to the connecting frame, the connecting bolt is axially fixed to the end plate, and the outer end of the connecting bolt is fixedly connected to the connecting frame;
[0015] In the initial state, the return spring is in a compressed state, and the return spring acts on the connection frame to make the sleeve abut against the side wall of the shaft cavity close to the oil inlet channel, the first through hole is misaligned with the first oil hole, and the second through hole corresponds to the second oil hole;
[0016] After the coil is energized, the conductor seat absorbs the connecting frame to drive the sleeve to move toward the conductor seat, and the sleeve abuts against the side wall of the shaft cavity close to the shaft hole. The first through hole corresponds to the first oil hole, and the second through hole is misaligned with the second oil hole.
[0017] Preferably, the rotor core assembly includes a rotor core and baffles fitted on both sides of the rotor core, the rotor cooling oil channel includes a plurality of rotor core oil channels axially penetrating the rotor core, and at least one rotor core oil inlet channel provided on the rotor core or the baffle, and at least one rotor core oil outlet channel provided on the rotor core or the baffle, and the rotor core oil inlet channel is correspondingly connected to the second oil hole.
[0018] Preferably, the baffle includes a first baffle and a second baffle, the first baffle corresponds to the second oil hole, at least one rotor core oil inlet channel is opened on the inner end surface of the first baffle, annular oil channels corresponding to several rotor core oil channels are constructed on the inner end surfaces of the first baffle and the second baffle, the rotor core oil inlet channel is communicated with the annular oil channel on the first baffle, a plurality of oil injection holes extending to the side wall of the first baffle and corresponding to the stator coil are opened circumferentially on the inner wall of the annular oil channel on the first baffle, a plurality of oil outlet grooves extending to the side wall of the second baffle and corresponding to the stator coil are opened circumferentially on the inner wall of the annular oil channel of the second baffle, the annular oil channel, the oil injection holes and the oil outlet grooves constitute the rotor core oil outlet channel.
[0019] The utility model adopts the above technical solution, by setting a sleeve in the hollow shaft, setting two cooling oil circuits on the rotor, setting two groups of through holes on the sleeve to correspond to the oil inlets of the two cooling oil circuits, and the sleeve can move axially in the hollow shaft, opening one cooling oil circuit while closing the other cooling oil circuit, focusing on cooling the heating area of the rotor that needs to be cooled, and improving the cooling efficiency. It should be noted here that multiple cooling oil circuits can be set to correspond to multiple groups of through holes according to needs.
[0020] At different speeds, the heat generated in different areas of the rotor is not the same. At low speeds, the rotor heats up moderately, while at high speeds, the heat inside the rotor is severe. Therefore, it is necessary to identify the areas that need cooling and establish corresponding cooling oil circuits for each area.
[0021] Two cooling oil circuits are arranged on the rotor. The first cooling oil circuit is arranged on the rotating shaft directly aligned with the stator coil, and the second cooling oil circuit passes through the inside of the rotor core. Therefore, at low speed, the rotor heats up not seriously, but the stator coil heats up relatively seriously. The push component control sleeve opens the first cooling oil circuit to focus on cooling the stator coil, and closes the second cooling oil circuit at the same time to avoid oil diversion and improve cooling efficiency. At high speed, the rotor heats up relatively seriously. The push component control sleeve opens the second cooling oil circuit to pass through the inside of the rotor to focus on cooling the rotor, and closes the first cooling oil circuit at the same time to avoid oil diversion and improve cooling efficiency.
[0022] In addition, the pushing component in this case uses an axial electromagnetic type and an axial electromagnetic spring type to control the sleeve, and it can also be other structural methods that can effectively drive the sleeve to move left and right. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 This is a schematic diagram of the front structure of a multi-circuit rotor cooling oil circuit drive motor.
[0024] Figure 2 for Figure 1 Schematic diagram of the AA section structure.
[0025] Figure 3 Schematic diagram of the three-dimensional structure of the rotor.
[0026] Figure 4 It is a schematic diagram of the three-dimensional structure of the rotating shaft.
[0027] Figure 5 This is a schematic diagram of the cooperation between the first push component and the sleeve.
[0028] Figure 6 This is a schematic diagram of the front structure of another multi-circuit rotor cooling oil circuit drive motor.
[0029] Figure 7 for Figure 7Schematic diagram of the CC cross-sectional structure.
[0030] Figure 8 Schematic diagram of the cooperation between the second push assembly and the sleeve.
[0031] Fig. 9 It is a schematic diagram of the three-dimensional structure of the rotor core.
[0032] Fig.10 It is a schematic diagram of the three-dimensional structure of the first baffle.
[0033] Fig.11 It is a schematic diagram of the three-dimensional structure of the second baffle. DETAILED DESCRIPTION
[0034] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.
[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more, unless otherwise clearly defined.
[0037] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0038] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0039] like Figures 1 to 11 A multi-circuit rotor cooling oil circuit drive motor shown in the figure comprises a stator and a rotor, wherein the rotor comprises a rotating shaft 1 and a rotor core assembly sleeved on the rotating shaft 1, and the stator comprises a stator core arranged outside the rotor core assembly, and a stator coil assembled on the stator core, wherein the rotating shaft 1 is a hollow shaft, an oil inlet channel 2 is formed inside one side of the hollow shaft, a pushing assembly is arranged on the other side of the hollow shaft, and an axial cavity 3 communicating with the oil inlet channel 2 is formed inside the hollow shaft;
[0040] Two cooling oil circuits are constructed on the rotor, and the oil inlet of the cooling oil circuit is arranged on the inner wall of the shaft cavity 3, and the oil outlet of the cooling oil circuit corresponds to the stator coil; a sleeve 4 whose circumferential wall abuts against the inner wall of the shaft cavity 3 is provided in the shaft cavity 3, and a distance is formed axially between the sleeve 4 and the shaft cavity 3; one axial side of the sleeve 4 is connected to the oil inlet channel 2, and one axial side is closed and connected to the pushing component; the sleeve 4 can move axially in the shaft cavity 3 under the action of the pushing component to open the oil inlet of one cooling oil circuit and close the oil inlet of another cooling oil circuit.
[0041] In the above technical solution, a sleeve is arranged in the hollow shaft and two cooling oil circuits are arranged on the rotor. The sleeve can move axially in the hollow shaft, opening one cooling oil circuit while closing the other cooling oil circuit, thereby focusing on cooling the heat-generating area of the rotor that needs to be cooled, thereby improving the cooling efficiency.
[0042] It should be noted here that, in this case, there are two cooling oil circuits, and multiple cooling oil circuits can be set to correspond to multiple groups of through holes according to needs.
[0043] like Figure 2 and Figure 7As shown, two groups of through holes are provided on the side wall of the sleeve 4, which can correspond to the oil inlets of the two cooling oil circuits respectively. The sleeve 4 can move axially under the action of the pushing component. When one group of through holes corresponds to the oil inlet of one cooling oil circuit, the other group of through holes is misaligned with the oil inlet of another cooling oil circuit. In this technical solution, through holes are provided on the sleeve to correspond to the oil inlets of the cooling oil circuits. When one group of through holes corresponds to the oil inlet of one cooling oil circuit, the cooling oil circuit is opened, and the other group of through holes is misaligned with the oil inlet of another cooling oil circuit, and the cooling oil circuit is closed. It should be noted that it is also possible to open and close the oil inlet of the cooling oil circuit in other forms, such as making the sleeve into a relatively short round block to move in a hollow shaft, but this form has a large movement range and is relatively difficult to control.
[0044] like Figure 4 , Figure 5 and Figure 8 As shown, at least one first oil hole 5 corresponding to the stator coil is circumferentially opened on both sides of the hollow shaft, and the first oil holes 5 on both sides extend to the shaft cavity 3 to form a first cooling oil circuit; at least one second oil hole 6 is circumferentially opened on the hollow shaft between the rotor core assembly and the shaft cavity 3, and a rotor cooling oil channel communicating with the second oil hole 6 is formed on the rotor core assembly, and the second oil hole 6 and the rotor cooling oil channel form a second cooling oil channel; the two groups of through holes include a first through hole 7 and a second through hole 8 corresponding to the first oil hole 5 and the second oil hole 6, respectively. In this technical solution, the first cooling oil circuit is formed on both sides of the rotating shaft, which can directly cool the stator coil; the second cooling oil channel is formed in the rotor core assembly, which can pass through and cool the rotor core.
[0045] like Figure 2 and Figure 5 As shown, the pushing assembly includes a conductor seat 9, a coil 10 and a magnet 11. An axial hole 12 is formed on the side of the hollow shaft opposite to the oil inlet channel 2. The conductor seat 9 is axially arranged, and one end is fixed to the end cover, and the other end extends into the axial hole 12. The coil 10 is wound on the conductor seat 9, and the magnet 11 is encapsulated at the end of the sleeve 4 and corresponds to the conductor seat 9.
[0046] When the rotor speed is less than a certain speed, the coil 10 is energized so that the conductor seat 9 attracts the magnet 11, and the sleeve 4 moves toward the conductor seat 9 until the magnet 11 abuts against the side wall of the shaft cavity 3, the first through hole 7 corresponds to the first oil hole 5, and the second through hole 8 is misaligned with the second oil hole 6;
[0047] When the rotor speed is greater than a certain speed, the coil 10 is energized in the reverse direction so that the conductor seat 9 pushes away the magnet 11, and the sleeve 4 moves away from the conductor seat 9 until the sleeve 4 rests against the other side wall of the shaft cavity 3, the first through hole 7 is misaligned with the first oil hole 5, and the second through hole 8 corresponds to the second oil hole 6.
[0048] In the above technical solution, a critical speed can be set, with a relatively low speed and a relatively high speed on both sides of the critical speed. When the motor rotor speed is less than the critical speed, the coil is energized, and an electromagnetic field in the opposite direction to that of the magnet is generated on the conductor seat. Opposites attract each other, and the sleeve is sucked to the uppermost side. At this time, the first cooling oil circuit is opened and the second cooling oil circuit is closed, focusing on cooling the stator coil to improve the cooling efficiency. When the motor rotor speed is greater than the critical speed, the current of the coil is reversed, the magnetism is reversed, and the sleeve is pushed to the lowermost side. At this time, the second cooling oil circuit is opened and the first cooling oil circuit is closed, focusing on cooling the inside of the rotor to improve the cooling efficiency. It should be noted that through magnetic attraction, the sleeve rotates synchronously with the shaft.
[0049] like Figure 7 and Figure 8 As shown, the pushing assembly includes a conductor seat 9, a coil 10, a reset spring 13, a connecting frame 14 and a connecting bolt 15. An axial hole 12 is formed on the side of the hollow shaft opposite to the oil inlet channel 2. The conductor seat 9 is axially arranged, and one end is fixed to the end cover, and the other end extends into the axial hole 12. The coil 10 is wound on the conductor seat 9, and the reset spring 13 is arranged on the outside of the coil 10. The connecting frame 14 sleeve is partially sleeved on the outside of the conductor seat 9 and interference-fitted in the axial hole 12. One end of the reset spring 13 is connected to the bottom of the conductor seat 9, and the other end is connected to the connecting frame 14; an end plate 16 is encapsulated on one side of the sleeve 4 close to the connecting frame 14, and the connecting bolt 15 is axially fixed to the end plate 16, and the outer end of the connecting bolt 15 is fixedly connected to the connecting frame 14;
[0050] In the initial state, the return spring 13 is in a compressed state, and the return spring 13 acts on the connecting frame 14 to make the sleeve 4 abut against the side wall of the shaft cavity 3 close to the oil inlet channel 2, the first through hole 7 is misaligned with the first oil hole 5, and the second through hole 8 corresponds to the second oil hole 6;
[0051] After the coil 10 is energized, the conductor seat 9 absorbs the connecting frame 14 to drive the sleeve 4 to move toward the conductor seat 9. The sleeve 4 abuts against the side wall of the shaft cavity 3 close to the shaft hole 12. The first through hole 7 corresponds to the first oil hole 5, and the second through hole 8 is offset from the second oil hole 6.
[0052] In the above technical solution, when the motor rotor speed is greater than the critical speed, the coil can be de-energized. When it is in a non-working state, due to the action of the reset spring, the axial sleeve is at the far left. At this time, the second cooling oil circuit is opened and the first cooling oil circuit is closed, focusing on cooling the inside of the rotor to improve the cooling efficiency. When the motor rotor speed is less than the critical speed, the coil is energized to work, and the axial electromagnetic force overcomes the spring force to pull the axial sleeve to the bottom. At this time, the first cooling oil circuit is opened and the second cooling oil circuit is closed, focusing on cooling the stator coil to improve the cooling efficiency. It should be noted that the connection frame is installed in the shaft hole with interference fit, so that the sleeve rotates synchronously with the shaft.
[0053] like Figures 9-11 As shown, the rotor core assembly includes a rotor core 17 and baffles fitted on both sides of the rotor core 17, and the rotor cooling oil passage includes a plurality of rotor core oil passages 18 axially penetrating the rotor core 17, and at least one rotor core oil inlet passage 19 provided on the rotor core 17 or the baffle, and at least one rotor core oil outlet passage provided on the rotor core 17 or the baffle, and the rotor core oil inlet passage 19 is correspondingly communicated with the second oil hole 6. In this technical solution, a rotor cooling oil passage is provided on the rotor core, and the rotor core oil inlet passage of the second cooling oil passage can be provided on the baffles on both sides or on the rotor core, but if there are more than three cooling oil passages constructed on the rotor core, the rotor core oil inlet passages of other cooling oil passages need to be provided on the rotor core.
[0054] Further, the baffle plate includes a first baffle plate 21 and a second baffle plate 22, the first baffle plate 21 corresponds to the second oil hole 6, at least one rotor core oil inlet channel 19 is opened on the inner end surface of the first baffle plate 21, and annular oil channels 23 corresponding to a plurality of rotor core oil channels 18 are constructed on the inner end surfaces of the first baffle plate 21 and the second baffle plate 22, the rotor core oil inlet channel 19 is communicated with the annular oil channel 23 on the first baffle plate 21, a plurality of oil injection holes 24 extending to the side wall of the first baffle plate 21 and corresponding to the stator coil are opened circumferentially on the inner wall of the annular oil channel 23 on the first baffle plate 21, a plurality of oil outlet grooves 25 extending to the side wall of the second baffle plate 22 and corresponding to the stator coil are opened circumferentially on the inner wall of the annular oil channel 23 of the second baffle plate 22, and the annular oil channel 23, the oil injection holes 24 and the oil outlet grooves 25 constitute the rotor core oil outlet channel. In this technical solution, the rotor core oil inlet channel of the second cooling oil channel is arranged on a baffle to avoid damaging the structure of the rotor core. In addition, a step is formed between the oil spray hole and the annular oil channel on the first baffle in this case. When the oil passes through the annular oil channel, part of it is blocked by the step and enters the rotor cooling oil channel, and then enters the oil outlet groove on the second baffle and is sprayed out. The oil outlet groove is arranged to have the same width as the annular oil channel, which can improve the spraying effect, so that the stator coil can be sprayed and cooled from both baffles.
[0055] In this specific embodiment, in order to address the problem that the existing rotor cooling oil circuits are insufficient in effectiveness and accuracy and cannot actively cool the areas of the rotor that need cooling, the above scheme arranges a sleeve in the hollow shaft, and two cooling oil circuits are arranged on the rotor, one directly cools the stator coil, and the other passes through the inside of the rotor core and then cools the stator coil. Two groups of through holes are arranged on the sleeve to correspond to the oil inlets of the two cooling oil circuits. The sleeve can move axially in the hollow shaft under the action of the pushing component, and while opening one cooling oil circuit, the other cooling oil circuit is closed, thereby focusing on cooling the hot areas of the rotor that need cooling, thereby improving the cooling efficiency.
[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0057] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.
Claims
1. A multi-circuit rotor cooling oil circuit drive motor, comprising a stator and a rotor, wherein the rotor comprises a rotating shaft (1) and a rotor core assembly sleeved on the rotating shaft (1), and the stator comprises a stator core arranged outside the rotor core assembly, and a stator coil mounted on the stator core, characterized in that: The rotating shaft (1) is a hollow shaft, an oil inlet channel (2) is formed inside one side of the hollow shaft, a pushing assembly is provided on the other side of the hollow shaft, and an axial cavity (3) communicating with the oil inlet channel (2) is formed inside the hollow shaft; Two cooling oil circuits are constructed on the rotor, the oil inlets of the cooling oil circuits are arranged on the inner wall of the shaft cavity (3), and the oil outlets of the cooling oil circuits correspond to the stator coils; a sleeve (4) is arranged in the shaft cavity (3) with a peripheral wall abutting against the inner wall of the shaft cavity (3), and a spacing is formed between the sleeve (4) and the shaft cavity (3) in the axial direction; one axial side of the sleeve (4) is in communication with the oil inlet channel (2), and one axial side is closed and connected to the pushing component; the sleeve (4) can be axially moved in the shaft cavity (3) under the action of the pushing component to open the oil inlet of one cooling oil circuit and close the oil inlet of another cooling oil circuit at the same time.
2. A multi-circuit rotor cooling oil circuit drive motor according to claim 1, characterized in that: Two groups of through holes are provided on the side wall of the sleeve (4), which can respectively correspond to the oil inlets of the two cooling oil circuits. The sleeve (4) can move axially under the action of the pushing component. When one group of through holes corresponds to the oil inlet of one cooling oil circuit, the other group of through holes is misaligned with the oil inlet of the other cooling oil circuit.
3. A multi-circuit rotor cooling oil circuit drive motor according to claim 2, characterized in that: At least one first oil hole (5) corresponding to the stator coil is circumferentially formed on both sides of the hollow shaft, and the first oil holes (5) on both sides extend to the shaft cavity (3) to form a first cooling oil path; at least one second oil hole (6) is circumferentially formed on the hollow shaft between the rotor core assembly and the shaft cavity (3); a rotor cooling oil channel communicating with the second oil hole (6) is formed on the rotor core assembly, and the second oil hole (6) and the rotor cooling oil channel form a second cooling oil channel; the two groups of through holes include a first through hole (7) and a second through hole (8) corresponding to the first oil hole (5) and the second oil hole (6), respectively.
4. A multi-circuit rotor cooling oil circuit drive motor according to claim 3, characterized in that: The pushing assembly comprises a conductor seat (9), a coil (10) and a magnet (11); an axial hole (12) is formed on the side of the hollow shaft opposite to the oil inlet passage (2); the conductor seat (9) is axially arranged, with one end fixed to the end cover and the other end extending into the axial hole (12); the coil (10) is wound on the conductor seat (9); and the magnet (11) is encapsulated at the end of the sleeve (4) and corresponds to the conductor seat (9); When the rotor speed is less than a certain speed, the coil (10) is energized so that the conductor seat (9) attracts the magnet (11), and the sleeve (4) moves toward the conductor seat (9) until the magnet (11) abuts against the side wall of the shaft cavity (3), the first through hole (7) corresponds to the first oil hole (5), and the second through hole (8) is offset from the second oil hole (6); When the rotor speed is greater than a certain speed, the coil (10) is energized in the reverse direction so that the conductor seat (9) pushes away the magnet (11), and the sleeve (4) moves away from the conductor seat (9) until the sleeve (4) abuts against the other side wall of the shaft cavity (3), the first through hole (7) is misaligned with the first oil hole (5), and the second through hole (8) corresponds to the second oil hole (6).
5. A multi-circuit rotor cooling oil circuit drive motor according to claim 3, characterized in that: The pushing assembly comprises a conductor seat (9), a coil (10), a return spring (13), a connecting frame (14) and a connecting bolt (15); an axial hole (12) is formed on the side of the hollow shaft opposite to the oil inlet channel (2); the conductor seat (9) is axially arranged, one end of which is fixed to the end cover, and the other end of which extends into the axial hole (12); the coil (10) is wound on the conductor seat (9); the return spring (13) is arranged on the outside of the coil (10); the connecting frame (14) is partially sleeved on the outside of the conductor seat (9) and interference-fitted in the axial hole (12); one end of the return spring (13) is connected to the bottom of the conductor seat (9), and the other end is connected to the connecting frame (14); an end plate (16) is encapsulated on one side of the sleeve (4) close to the connecting frame (14); the connecting bolt (15) is axially fixed to the end plate (16), and the outer end of the connecting bolt (15) is fixedly connected to the connecting frame (14); In the initial state, the return spring (13) is in a compressed state, and the return spring (13) acts on the connection frame (14) to make the sleeve (4) abut against the side wall of the shaft cavity (3) close to the oil inlet channel (2), the first through hole (7) and the first oil hole (5) are offset, and the second through hole (8) and the second oil hole (6) correspond to each other; After the coil (10) is energized, the conductor seat (9) absorbs the connection frame (14) to drive the sleeve (4) to move toward the conductor seat (9), and the sleeve (4) abuts against the side wall of the shaft cavity (3) close to the shaft hole (12), the first through hole (7) corresponds to the first oil hole (5), and the second through hole (8) is offset from the second oil hole (6).
6. A multi-circuit rotor cooling oil circuit drive motor according to claim 3, characterized in that: The rotor core assembly comprises a rotor core (17) and baffles fitted on both sides of the rotor core (17); the rotor cooling oil passage comprises a plurality of rotor core oil passages (18) axially penetrating the rotor core (17); at least one rotor core oil inlet passage (19) disposed on the rotor core (17) or the baffle; and at least one rotor core oil outlet passage disposed on the rotor core (17) or the baffle; the rotor core oil inlet passage (19) correspondingly communicates with the second oil hole (6).
7. A multi-circuit rotor cooling oil circuit drive motor according to claim 6, characterized in that: The baffle plate comprises a first baffle plate (21) and a second baffle plate (22); the first baffle plate (21) corresponds to the second oil hole (6); at least one rotor core oil inlet passage (19) is provided on the inner end surface of the first baffle plate (21); annular oil passages (23) corresponding to the plurality of rotor core oil passages (18) are constructed on the inner end surfaces of the first baffle plate (21) and the second baffle plate (22); the rotor core oil inlet passage (19) is in communication with the annular oil passage (23) on the first baffle plate (21). The inner wall of the annular oil passage (23) on the first baffle (21) is provided with a plurality of oil injection holes (24) extending to the side wall of the first baffle (21) and corresponding to the stator coils, and the inner wall of the annular oil passage (23) on the second baffle (22) is provided with a plurality of oil outlet grooves (25) extending to the side wall of the second baffle (22) and corresponding to the stator coils. The annular oil passage (23), the oil injection holes (24) and the oil outlet grooves (25) constitute the oil outlet channel of the rotor core.