Motor cooling system and vehicle driving assembly

Abstract

The utility model relates to the technical field of vehicle cooling and lubrication, and provides a motor cooling system and a vehicle driving assembly. The utility model relates to a motor cooling system, which comprises an oil liquid pumping part and a motor cooling part connected with the oil liquid pumping part, the motor cooling part is provided with a rotor cooling loop for conveying oil to a rotor of the motor, and part of the rotor cooling loop is formed in an oil duct of the rotating component; the rotating component is a rotor shaft of the rotor or a rotating shaft of the oil pumping part, an adjusting valve is arranged on the rotating component, and the opening degree of the adjusting valve can be increased along with the increase of the rotating speed of the rotating component or reduced along with the reduction of the rotating speed of the rotating component, so that the flow of oil passing through the oil duct is adjusted. According to the motor cooling system, the dragging torque of the rotor can be reduced, the transmission efficiency of the driving assembly can be improved, and meanwhile, the cost reduction design can be realized, so that the product performance of the driving assembly and the quality of the whole vehicle can be improved.

Description

Technical Field

[0001] This utility model relates to the field of vehicle cooling and lubrication technology, and in particular to an electric motor cooling system. It also relates to a vehicle drive assembly equipped with the electric motor cooling system. Background Technology

[0002] Currently, multi-functional electric drive systems are gaining popularity due to their high integration, which reduces the space required for vehicle installation and makes communication between sub-modules more direct. Moreover, since one of the key aspects of low energy consumption in new energy vehicles is the transmission efficiency of the vehicle's power system and an excellent thermal management system, multi-functional electric drive systems mainly focus on oil-cooled motors, dry oil pans, low-temperature oil cooler bypass, precision lubrication, shared oil cooling for control and power modules, and direct cooling of the vehicle's three electric components and cabin air conditioning refrigerant.

[0003] Current electric drive systems typically include multiple cooling and lubrication circuits in their oil cooling systems, each used to cool different electric drive components. These circuits may include, for example, a reducer cooling and lubrication circuit for cooling the reducer, a rotor cooling and lubrication circuit for cooling the motor rotor, and a stator cooling and lubrication circuit for cooling the motor stator.

[0004] In practical applications, electric drive systems require no cooling flow to the motor rotor under low-speed (low-to-medium load) conditions. However, the fixed-ratio throttling orifice design in traditional oil-cooled systems results in redundant cooling flow at the rotor to meet the stator's cooling requirements. This increases the rotor's drag torque, affecting the overall transmission efficiency under low-speed (low-to-medium load) conditions. While existing technologies can address this by adding solenoid valves to the rotor's cooling and lubrication circuit, this significantly increases the cost of individual components and the control system, leading to a disproportionate investment and return. Utility Model Content

[0005] In view of this, the present invention aims to propose a motor cooling system that can improve the transmission efficiency of the drive assembly while also achieving cost reduction.

[0006] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0007] An electric motor cooling system includes an oil pumping unit and an electric motor cooling unit connected to the oil pumping unit;

[0008] The motor cooling unit has a rotor cooling circuit that supplies oil to the rotor of the motor, and a portion of the rotor cooling circuit is formed in the oil passage of the rotating component.

[0009] The rotating part is a rotor shaft of the rotor or a rotating shaft of the oil pumping part, and an adjusting valve is arranged on the rotating part, the opening degree of the adjusting valve can be increased with the increase of the rotating speed of the rotating part, or decreased with the decrease of the rotating speed of the rotating part, so as to adjust the flow of the oil through the oil passage.

[0010] Further, the adjusting valve comprises a valve seat arranged in the oil passage, a valve hole arranged on the valve seat, a valve core slidingly arranged on the valve seat, and an elastic part arranged between the valve core and the rotating part; when the rotating part rotates, the valve core can compress the elastic part and move away from the valve hole, so that the valve hole is communicated with the rotor cooling circuit.

[0011] Further, the valve hole is a plurality of valve holes arranged in a circumferential direction of the rotating part, and the valve core is arranged in each valve hole, and the elastic part is arranged between each valve core and the rotating part.

[0012] Further, the valve seat is provided with a sliding groove arranged through the rotating part in a radial direction, the valve core is slidingly arranged in the sliding groove, and the elastic part is located in the sliding groove.

[0013] Further, the valve core comprises a first core body and a second core body abutting each other, the elastic part comprises a first elastic member arranged between the first core body and the rotating part, and a second elastic member arranged between the first core body and the rotating part; when the rotating part rotates, the first core body can compress the first elastic member, the second core body can compress the second elastic member, and the first core body and the second core body slide away from each other, so that the valve hole is communicated with the rotor cooling circuit.

[0014] Further, the first core body and the second core body are provided with a plug-in structure, when the first core body and the second core body approach each other, the first core body and the second core body are connected by the plug-in structure.

[0015] Further, the valve hole is arranged along the center line of the rotating part, the sliding groove comprises a first sliding groove and a second sliding groove arranged on both sides of the valve hole in a radial direction of the rotating part; the first core body and the first elastic member are located in the first sliding groove, the second core body and the second elastic member are located in the second sliding groove, and the first sliding groove and the second sliding groove are both inclined relative to the valve hole.

[0016] Further, when the rotating component is a rotating shaft of the oil pumping part, a groove in communication with the oil passage is arranged on the rotating shaft, the groove is arranged along the circumference of the rotating shaft, and the valve seat is arranged in the groove; when the rotating component is a rotor shaft of the rotor, a groove is arranged on the end of the rotor shaft connected with the external transmission component, the groove is formed between the rotor shaft and the external transmission component and arranged along the circumference of the rotor shaft, and the valve seat is arranged in the groove.

[0017] Further, the valve seat is interference-pressed in the groove; and / or the external transmission component is a speed reducer connected with the motor.

[0018] Compared with the prior art, the motor cooling system has the following advantages:

[0019] The motor cooling system is based on the setting form that the opening degree of the adjusting valve can increase with the increase of the rotating component speed or decrease with the decrease of the rotating component speed, so that the rotor can not be provided with oil when the rotor has no cooling and lubrication requirement in the low rotating speed working condition of the motor, and the rotor can be provided with oil when the rotor has cooling and lubrication requirement in the high rotating speed working condition of the motor. Compared with the setting form of the electromagnetic valve in the conventional technology, the precise cooling and lubrication requirement of the drive assembly heat management can be met through the mechanical structure, which not only helps to reduce the drag torque of the rotor and improve the transmission efficiency of the drive assembly, but also helps to realize the cost reduction design, thereby helping to improve the product quality of the drive assembly.

[0020] In addition, the adjusting valve mainly comprises a valve seat, a valve hole, a valve core and an elastic part, so that the structure is simple, the use reliability of the adjusting valve is improved, the manufacturing cost of the adjusting valve is reduced, and the position of the valve core changes with the change of the rotating component speed, so that the oil flow in the oil passage can be precisely controlled according to the rotating component speed, that is, the oil supply amount of the rotor can be precisely controlled.

[0021] Secondly, the valve hole is a plurality of valve holes arranged along the circumference of the rotating component, and the valve core is arranged in each valve hole, and the elastic part is arranged between each valve core and the rotating component, so that the structure is simple and the cost reduction design is facilitated. The sliding groove is arranged on the valve seat and arranged along the radial direction of the rotating component, the valve core is arranged in the sliding groove, and the elastic part is arranged in the sliding groove, so that the sliding stability of the valve core can be ensured, and the use reliability of the adjusting valve is improved. The first core body and the second core body are connected through the insertion structure when the first core body and the second core body are close to each other, so that the sealing reliability of the valve core to the valve hole when the rotor has no cooling and lubrication requirement can be ensured.

[0022] In addition, the first sliding groove and the second sliding groove are both arranged obliquely relative to the valve hole, so that stamping can be formed when the oil pressure is large, the first core body and the second core body are separated from each other, and then the valve hole is communicated with the rotor cooling circuit to supply oil to the rotor, thereby facilitating to meet the rotor cooling and lubrication requirement under the low-speed high-torque working condition of the motor. The valve seat is arranged in the groove, thereby facilitating to improve the integration of the whole system and reduce the space arrangement requirement. The valve seat is press-fitted in the groove, thereby facilitating to ensure the structural stability of the whole adjusting valve.

[0023] Another purpose of the utility model lies in providing a vehicle driving assembly, wherein the vehicle driving assembly is provided with a motor and the motor cooling system as described above.

[0024] The vehicle driving assembly is provided with the motor cooling system as described above, the precise cooling and lubrication requirement of the driving assembly thermal management can be met through a mechanical structure, the drag torque of the rotor can be reduced, the transmission efficiency is improved, the cost reduction design is realized, and thus the vehicle quality is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] The drawings that form a part of the utility model are used to provide a further understanding of the utility model, the illustrative embodiment of the utility model and the description thereof are used to explain the utility model, and do not constitute an improper limitation on the utility model. In the drawings:

[0026] Figure 1 It is a structure schematic view of the motor cooling system according to the embodiment of the utility model;

[0027] Figure 2 It is another structure schematic view of the motor cooling system according to the embodiment of the utility model;

[0028] Figure 3 It is a structure schematic view of the first example of the adjusting valve according to the embodiment of the utility model;

[0029] Figure 4 It is a structure schematic view of the adjusting valve according to the embodiment of the utility model;

[0030] Figure 5 It is a structure schematic view of the adjusting valve when closed according to the embodiment of the utility model;

[0031] Figure 6 It is a structure schematic view of the adjusting valve when opened according to the embodiment of the utility model;

[0032] Figure 7 It is a structure schematic view of the second example of the adjusting valve according to the embodiment of the utility model;

[0033] Figure 8The third example structure schematic view of the adjusting valve is described in the embodiment of the utility model.

[0034] Mark explanation:

[0035] 1, oil pump part; 2, oil storage tank; 3, oil filter; 4, oil cooler; 5, controller;

[0036] 6, rotating part; 60, oil passage; 61, rotor shaft; 62, external transmission part; 63, recess;

[0037] 7, adjusting valve; 71, valve seat; 72, valve hole; 73, valve core; 731, first core body; 732, second core body; 74, elastic part; 741, first elastic member; 742, second elastic member; 75, sliding groove; 751, first sliding groove; 752, second sliding groove;

[0038] 8, cooling main circuit; 81, rotor cooling circuit; 82, stator cooling circuit; 83, speed reducer cooling circuit;

[0039] 9, whole vehicle cooling liquid circuit. DETAILED DESCRIPTION

[0040] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0041] In the following description, specific details are set forth in order to provide a thorough understanding of embodiments of the application. However, persons of ordinary skill in the art will readily recognize that embodiments of the application can be practiced without these specific details. In other instances, well-known structures, devices, circuits, and processes have not been described in detail so as not to unnecessarily obscure aspects of the application.

[0042] In the description of the utility model, it should be noted that if the terms indicating orientation or position relationship such as "up", "down", "inner", "outer" appear, it is based on the orientation or position relationship shown in the drawing, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model. In addition, if the terms "first", "second" appear, they are also used for description purposes only and cannot be understood as indicating or implying relative importance.

[0043] Moreover, in the description of the utility model, unless otherwise explicitly limited, the terms "mounting", "connecting", "connection" and "connecting piece" should be understood broadly. For example, it can be fixed connection, or detachable connection, or integrally connected, it can be mechanical connection, or electrical connection, it can be directly connected, or indirectly connected through intermediate medium, or internal communication of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood in combination with specific circumstances.

[0044] The utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0045] Embodiment one

[0046] The embodiment relates to a motor cooling system, which can improve the transmission efficiency of a drive assembly and realize cost reduction design, thereby solving the problems that the throttle hole design is not conducive to precise control of cooling flow at the motor rotor in traditional technology, and the use of electromagnetic valve leads to high cost.

[0047] As shown in the whole structure, Figures 1 to 3 The motor cooling system of the embodiment comprises an oil pumping part 1 and a motor cooling part connected with the oil pumping part 1. The motor cooling part has a rotor cooling circuit 81 for delivering oil to the rotor of the motor, and part of the rotor cooling circuit 81 is formed in the oil channel 60 of the rotating part 6.

[0048] In addition, the rotating part 6 is the rotor shaft 61 of the rotor or the rotating shaft of the oil pumping part 1, and the adjusting valve 7 is arranged on the rotating part 6. The opening degree of the adjusting valve 7 can increase with the increase of the rotating speed of the rotating part 6, or decrease with the decrease of the rotating speed of the rotating part 6, so as to adjust the flow of oil through the oil channel 60.

[0049] At this time, as arranged above, the opening degree of the adjusting valve 7 can increase with the increase of the rotating speed of the rotating part 6, or decrease with the decrease of the rotating speed of the rotating part 6, so that the rotor is not provided with oil when the rotor has no cooling and lubrication requirement under the low rotating speed working condition of the motor, and the rotor is provided with oil when the rotor has cooling and lubrication requirement under the high rotating speed working condition of the motor. Compared with the setting form of the electromagnetic valve in the traditional technology, the precise cooling and lubrication requirement of the thermal management of the drive assembly can be met through mechanical structure, which not only helps to reduce the drag torque of the rotor and improve the transmission efficiency of the drive assembly, but also helps to realize cost reduction design.

[0050] Based on the above overall introduction, in detail, in the specific implementation, the motor cooling system of the embodiment is part of the entire oil cooling system in the drive assembly, which not only includes the rotor cooling circuit 81 for cooling and lubricating the rotor, but also includes the stator cooling circuit 82 for cooling and lubricating the motor stator and the reducer cooling circuit 83 for cooling and lubricating the reducer. The rotor cooling circuit 81, the stator cooling circuit 82, and the reducer cooling circuit 83 are all constituent parts of the cooling main circuit 8 of the oil cooling system.

[0051] At this time, as shown in Figs. 1 to 3, Figure 1 Figure 2 As shown in Figs. 1 to 3, the motor cooling system and the oil cooling system can share the cooling main circuit 8, which is provided with the oil storage tank 2, the oil filter 3, the oil cooler 4, and the oil liquid pumping part 1. In the specific structure, the output ends of the rotor cooling circuit 81, the stator cooling circuit 82, and the reducer cooling circuit 83 are all connected with the input end of the oil storage tank 2. The input end of the oil filter 3 is connected with the output end of the oil storage tank 2. The output end of the oil filter 3 is connected with the input end of the oil liquid pumping part 1. The output end of the oil liquid pumping part 1 is connected with the input end of the oil cooler 4. The output end of the oil cooler 4 is connected with the input ends of the rotor cooling circuit 81, the stator cooling circuit 82, and the reducer cooling circuit 83.

[0052] In addition, in the embodiment, the motor cooling system and the oil cooling system can also use the controller 5 and the temperature sensor. In this way, the speed of the oil liquid pumping part 1 and the motor can be controlled by the controller 5 according to the oil temperature detected by the temperature sensor, and the precise cooling and lubrication demand of the drive assembly thermal management can be met based on the setting of the adjusting valve 7. At the same time, the oil liquid pumping part 1 of the embodiment can use the oil pump known to those skilled in the art. The motor drive system of the embodiment refers to the drive assembly including the motor and the reducer, such as the electric drive assembly or the oil-electric hybrid drive assembly known to those skilled in the art.

[0053] It should be further pointed out that the temperature sensor is mainly used to detect the oil temperature and transmit the oil temperature signal to the controller 5. The oil filter 3 is mainly used to filter the oil liquid delivered from the oil storage tank to ensure that clean oil liquid is provided to the oil liquid pumping part 1. The oil liquid pumping part 1 is mainly used to pressurize and circulate the oil liquid for the entire cooling system. The oil cooler 4 is mainly used to exchange heat between the oil liquid and the cooling liquid in the vehicle cooling liquid circuit 9, and deliver the cooled oil liquid to the subsequent part. The heated cooling liquid will enter the front-end cooler of the vehicle cooling liquid circuit 9 for the next cycle of work. In the specific implementation, the controller 5 can be cooled by the cooling liquid. Moreover, in the embodiment, when the rotating part 6 is the rotor shaft 61, the controller 5 can be the motor controller 5.

[0054] ​In this embodiment, as a preferred implementation form, the adjusting valve 7 is combined with the oil passage 60 Figures 3 to 6 As shown in the figure, the adjusting valve 7 includes a valve seat 71 located in the oil passage 60, a valve hole 72 arranged on the valve seat 71, a valve core 73 slidingly arranged on the valve seat 71, and an elastic part 74 arranged between the valve core 73 and the rotating part 6. When the rotating part 6 rotates, the valve core 73 can compress the elastic part 74 and move away from the valve hole 72, so that the valve hole 72 is in communication with the rotor cooling circuit 81.

[0055] It can be understood that the adjusting valve 7 is mainly composed of the valve seat 71, the valve hole 72, the valve core 73 and the elastic part 74, which can make the structure simple, improve the use reliability of the adjusting valve 7, and reduce the manufacturing cost of the adjusting valve 7. The arrangement of the elastic part 74 also facilitates the change of the position of the valve core 73 with the change of the rotating speed of the rotating part 6, so as to accurately control the oil flow in the oil passage 60 according to the rotating speed of the rotating part 6, that is, to accurately control the oil supply amount of the rotor.

[0056] In this embodiment, since the rotating part 6 is mainly the rotor shaft 61 or the rotating shaft of the oil pumping part 1, the valve seat 71 is preferably arranged in the form of a cylinder to facilitate its arrangement and installation in the rotating part 6, and the oil passage 60 of the rotating part 6 is preferably arranged along the center line of the rotation of the rotating part 6. In this way, it can be facilitated to compress the elastic part 74 with the increase of the rotating speed of the rotating part 6, so that the opening of the valve hole 72 increases, and vice versa, so that the opening of the valve hole 72 decreases with the decrease of the rotating speed of the rotating part 6. As a preferred implementation form, when the rotating part 6 is the rotating shaft of the oil pumping part 1, a groove 63 is arranged on the rotating shaft and in communication with the oil passage 60, the groove 63 is arranged along the circumference of the rotating shaft, and the valve seat 71 is arranged in the groove 63.

[0057] At the same time, as a preferred implementation form, when the rotating part 6 is the rotor shaft 61 of the rotor, the end of the rotor shaft 61 connected with the external transmission part 62 is provided with a groove 63, the groove 63 is formed between the rotor shaft 61 and the external transmission part 62 and arranged along the circumference of the rotor shaft 61, and the valve seat 71 is arranged in the groove 63. Of course, whether the rotating part 6 is the rotor shaft 61 or the rotating shaft of the oil pumping part 1, the valve seat 71 is arranged in the groove 63, which facilitates to improve the integration of the whole system and reduce the space arrangement requirement.

[0058] In specific implementation, in this embodiment, as a preferred implementation form, the valve seat 71 is interference-fitted in the groove 63 to facilitate to ensure the structural stability of the adjusting valve 7. Secondly, the above-mentioned external transmission part 62 is preferably a reducer connected with the motor, that is, the groove 63 is specifically formed between the rotor shaft 61 and the transmission shaft of the reducer, and the rotor shaft 61 and the transmission shaft of the reducer can be connected through a spline structure. The advantage of this arrangement is that it can achieve the purpose of cost reduction.

[0059] Need to mention, based on the groove 63 design in the oil channel 60 of the rotating part 6, the arrangement and use of the adjusting valve 7 of the embodiment needs to depend on the rotating part 6 to some extent, that is, the rotating part 6 actually constitutes the shell of the adjusting valve 7, and the guiding movement of the valve core 73 can also be realized by the limitation of the groove 63, so that the integration of the adjusting valve 7 in the rotating part 6 can be realized, the overall integration of the system is improved, the occupied space in the system is reduced, the arrangement difficulty of the adjusting valve 7 is reduced, and the cost reduction design is realized.

[0060] In addition, in the embodiment, as a first preferred exemplary structure, as shown in Figure 3 and Figure 4 , the valve hole 72 is arranged circumferentially spaced apart, and each valve hole 72 is provided with a valve core 73, and each valve core 73 and the rotating part 6 is provided with an elastic part 74. In this way, not only the structure is simple, but also the cost reduction design is facilitated.

[0061] To be specific, the above-mentioned valve hole 72 can be preferably arranged as four circumferentially spaced apart along the rotating part 6, each valve hole 72 is communicated with the groove 63, and each valve core 73 can compress the corresponding elastic part 74 with the increase of the rotating speed of the rotating part 6, that is, close to the rotating part 6, so that the opening of each valve hole 72 increases, which not only facilitates the arrangement of each valve core 73 and each elastic part 74, simplifies the structure of the adjusting valve 7, but also can disperse the oil pressure. The above-mentioned elastic part 74 can use the spring product commonly used by those skilled in the art.

[0062] In the embodiment, Figure 5 that is, each valve core 73 can compress the corresponding elastic part 74 with the increase of the rotating speed of the rotating part 6, so that the opening of each valve hole 72 increases, Figure 6 that is, the structure diagram of each valve core 73 closing the valve hole 72 under the action of the corresponding elastic part 74 when the rotating speed of the rotating part 6 is zero or low.

[0063] In addition, as a second preferred exemplary structure, in the embodiment, as shown in Figure 7 , the valve seat 71 is provided with a sliding groove 75 arranged through the rotating part 6 in the radial direction, the valve core 73 is slidably arranged in the sliding groove 75, and the elastic part 74 is located in the sliding groove 75. It can be understood that the arrangement of the adjusting valve 7 can facilitate to ensure the sliding stability of the valve core 73 and improve the use reliability of the adjusting valve 7.

[0064] In a preferred embodiment, the valve core 73 comprises a first core body 731 and a second core body 732 abutting each other, and the elastic part 74 comprises a first elastic member 741 arranged between the first core body 731 and the rotating member 6, and a second elastic member 742 arranged between the first core body 731 and the rotating member 6. When the rotating member 6 rotates, the first core body 731 can compress the first elastic member 741, the second core body 732 can compress the second elastic member 742, and the first core body 731 and the second core body 732 can slide away from each other, so that the valve hole 72 communicates with the rotor cooling circuit 81.

[0065] Here, the valve core 73 and the elastic part 74 are designed as separate bodies, and the abutting position of each core body is located at the rotation center line position of the rotating member 6, which facilitates the compression of the corresponding elastic member by centrifugal force when the rotating member 6 rotates, thereby achieving the opening of the valve hole 72 and the increase of the opening degree.

[0066] In addition, as a preferred embodiment, the first core body 731 and the second core body 732 are provided with a plug-in structure, and when the first core body 731 and the second core body 732 approach each other, the first core body 731 and the second core body 732 are connected by the plug-in structure. Based on the design of the plug-in structure, the abutting position of the first core body 731 and the second core body 732 can be avoided from being broken by excessive oil pressure when the rotor has no cooling and lubrication requirement, which facilitates to ensure the sealing reliability of the valve core 73 to the valve hole 72 under this working condition.

[0067] It should be noted that the first elastic member 741 and the second elastic member 742 of the present embodiment can preferably be springs. The plug-in structure of the present embodiment can include a plug-in slot arranged on the first core body 731 and a plug-in protrusion arranged on the second core body 732, and the plug-in protrusion is inserted into the plug-in slot to achieve the plug-in design described above.

[0068] In addition, based on the structure and arrangement of the sliding groove 75, the first core body 731, the second core body 732, the first elastic member 741 and the second elastic member 742, as a third preferred exemplary structure, as shown in Figure 8 the valve hole 72 is arranged along the rotation center line of the rotating member 6, and the sliding groove 75 comprises a first sliding groove 751 and a second sliding groove 752 arranged on both sides of the valve hole 72 along the radial direction of the rotating member 6. In the specific structure, the first core body 731 and the first elastic member 741 are located in the first sliding groove 751, the second core body 732 and the second elastic member 742 are located in the second sliding groove 752, and the first sliding groove 751 and the second sliding groove 752 are both arranged obliquely relative to the valve hole 72.

[0069] The first chute 751 and the second chute 752 are both arranged obliquely relative to the valve hole 72, so that when the oil pressure is large, stamping can be formed to make the first core 731 and the second core 732 slide away from each other, and then the valve hole 72 is communicated with the rotor cooling circuit 81 to supply oil to the rotor, which is beneficial to meet the rotor cooling and lubrication demand under the low-speed high-torque working condition of the motor.

[0070] To better understand the relationship between the different cooling and lubrication requirements of the rotor and the oil pumping part 1 and the regulating valve 7 in the present embodiment, the following will be described in detail when the rotating part 6 is the rotor shaft 61 of the rotor or the rotating shaft of the oil pumping part 1. Moreover, the following table shows the corresponding cooling and lubrication requirements of the rotor under different working conditions, and the working states required by the oil pumping part 1 and the regulating valve 7 under the working condition.

[0071]

[0072]

[0073] In combination with the table, when the rotating part 6 is the rotating shaft of the oil pumping part 1, any one of the three example structures of the regulating valve 7 can be used, and the controller 5 can be used to control the rotating speed of the rotating shaft of the oil pumping part 1 to adjust the opening degree of the regulating valve 7. Specifically, under the whole vehicle boosting and charging working condition, the temperature at the rotor is high, and the rotor needs to be cooled, at this time, the controller 5 is used to control the increase of the rotating speed of the rotating shaft of the oil pumping part 1 to open the regulating valve 7, and if the temperature at the rotor increases, the opening degree of the regulating valve 7 will also increase with the increase of the rotating speed of the rotating shaft, thereby realizing precise cooling and lubrication of the rotor. Under the low-speed high-torque working condition of the motor, the temperature at the rotor is high, and the rotor needs to be cooled, at this time, the controller 5 is used to control the increase of the rotating speed of the rotating shaft of the oil pumping part 1 to open the regulating valve 7, and if the temperature at the rotor increases, the opening degree of the regulating valve 7 will also increase with the increase of the rotating speed of the rotating shaft, thereby realizing precise cooling and lubrication of the rotor.

[0074] At the same time, under the low-speed low-torque working condition of the motor, the temperature at the rotor is low, and the rotor does not need to be cooled, at this time, the controller 5 is used to control the decrease or 0 of the rotating speed of the rotating shaft of the oil pumping part 1 to close the regulating valve 7, thereby reducing the drag torque of the rotor and improving the transmission efficiency of the driving assembly. Under the high-speed low-torque working condition of the motor, the temperature at the rotor is high, and the rotor needs to be cooled, at this time, the controller 5 is used to control the increase of the rotating speed of the rotating shaft of the oil pumping part 1 to open or increase the opening degree of the regulating valve 7, thereby realizing precise cooling and lubrication of the rotor.

[0075] However, when the rotating component 6 is the rotor shaft 61, the regulating valve 7 using the first and second example structures can only meet the cooling and lubrication requirements of the rotor under low-speed, low-torque and high-speed, low-torque motor conditions. Specifically, under low-speed, low-torque motor conditions, the rotor temperature is low and there is no cooling requirement. At this time, the controller 5 controls the speed of the rotor shaft 61 to decrease or become zero, causing the regulating valve 7 to close, reducing the rotor's drag torque and improving the transmission efficiency of the drive assembly. Under high-speed, low-torque motor conditions, the rotor temperature is high and there is a cooling requirement. At this time, the controller 5 controls the increase of the rotor shaft 61 speed, causing the regulating valve 7 to open or increase its opening degree to achieve precise cooling and lubrication of the rotor.

[0076] Since the rotating component 6 is the rotor shaft 61, if the regulating valve 7 of the third example structure is used, the cooling and lubrication requirements of the rotor can be met under the following conditions: low speed and low torque of the motor, high speed and low torque of the motor, and low speed and high torque of the motor. The control process of the regulating valve 7 with the third example structure under the low speed and low torque and high speed and low torque conditions is the same as that of the regulating valve 7 with the first and second example structures, and will not be described again. However, under the low speed and high torque condition, the rotor temperature is high, requiring cooling. At this time, the regulating valve 7 is opened by increasing the rotational speed of the rotor shaft 61 controlled by the controller 5. If the rotor temperature increases, the opening degree of the regulating valve 7 will also increase with the increase in the rotational speed of the rotor shaft 61, thereby achieving precise cooling and lubrication of the rotor.

[0077] It should still be mentioned that this embodiment includes... Figures 3 to 8 The structures shown for control valve 7 are primarily schematic and do not necessarily represent the exact dimensions of control valve 7 and its related structures as shown in the attached diagram. Figures 3 to 8 Consistency, especially Figure 7 and Figure 8 The design concept of the regulating valve 7 with different example structures is shown in the figure.

[0078] The motor cooling system in this embodiment, compared to the traditional solenoid valve setup, can meet the precise cooling and lubrication requirements of the drive assembly's thermal management through a mechanical structure. This allows for precise cooling and lubrication of the rotor, reducing rotor drag torque, improving drive assembly transmission efficiency, and ultimately enhancing product reliability. Consequently, product performance, competitiveness, vehicle range, and customer satisfaction are all improved. Furthermore, by placing the regulating valve 7 within the oil passage 60 of the rotating component 6, no additional space is required, reducing layout complexity and control costs, offering significant advantages in integration and cost. The precise cooling and lubrication of the rotor further improves motor transmission efficiency and extends high-load operating time.

[0079] Example 2

[0080] The embodiment relates to a vehicle driving assembly, and the vehicle driving assembly is provided with a motor and the motor cooling system in the embodiment one.

[0081] The vehicle driving assembly in the embodiment can realize precise cooling and lubrication control of driving assembly thermal management, reduce rotor drag torque, improve transmission efficiency, and facilitate cost reduction, so that the vehicle endurance mileage and the vehicle quality can be improved.

[0082] The above merely describes the preferred embodiments of the utility model and is not intended to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An electric machine cooling system, characterized in that: comprising an oil pumping unit (1), and an electric machine cooling unit connected with the oil pumping unit (1); the electric machine cooling unit has a rotor cooling circuit (81) for delivering oil to a rotor of an electric machine, and part of the rotor cooling circuit (81) is formed in an oil passage (60) of a rotating part (6); the rotating part (6) is a rotor shaft (61) of the rotor or a rotating shaft of the oil pumping unit (1), and an adjusting valve (7) is arranged on the rotating part (6), an opening degree of the adjusting valve (7) can be increased with an increase of a rotating speed of the rotating part (6), or decreased with a decrease of the rotating speed of the rotating part (6), so as to adjust a flow of the oil passing through the oil passage (60).

2. The electric machine cooling system according to claim 1, characterized in that: the adjusting valve (7) comprises a valve seat (71) arranged in the oil passage (60), a valve hole (72) arranged on the valve seat (71), a valve core (73) slidingly arranged on the valve seat (71), and an elastic part (74) arranged between the valve core (73) and the rotating part (6); when the rotating part (6) rotates, the valve core (73) can compress the elastic part (74) and move away from the valve hole (72), so as to make the valve hole (72) communicate with the rotor cooling circuit (81).

3. The electric machine cooling system according to claim 2, characterized in that: the valve hole (72) is a plurality of valve holes (72) arranged in a circumferential direction of the rotating part (6) at intervals, and the valve core (73) is arranged in each of the valve holes (72), and the elastic part (74) is arranged between each of the valve cores (73) and the rotating part (6).

4. The electric machine cooling system according to claim 2, characterized in that: the valve seat (71) is provided with a sliding groove (75) arranged through in a radial direction of the rotating part (6), the valve core (73) is slidingly arranged in the sliding groove (75), and the elastic part (74) is located in the sliding groove (75).

5. The electric machine cooling system according to claim 4, characterized in that: the valve core (73) comprises a first core body (731) and a second core body (732) abutting each other, the elastic part (74) comprises a first elastic member (741) arranged between the first core body (731) and the rotating part (6), and a second elastic member (742) arranged between the first core body (731) and the rotating part (6); when the rotating part (6) rotates, the first core body (731) can compress the first elastic member (741), the second core body (732) can compress the second elastic member (742), and the first core body (731) and the second core body (732) slide away from each other, so as to make the valve hole (72) communicate with the rotor cooling circuit (81).

6. The electric machine cooling system according to claim 5, characterized in that: ​ ​ ​ ​ ​ ​ ​ ​ ​ The first core body (731) and the second core body (732) are provided with a plug-in structure, and the first core body (731) and the second core body (732) are connected by the plug-in structure when the first core body (731) and the second core body (732) are close to each other.

7. The motor cooling system of claim 5, wherein: The valve hole (72) is arranged along the rotation center line of the rotating part (6), and the sliding groove (75) comprises a first sliding groove (751) and a second sliding groove (752) which are respectively arranged on the two sides of the valve hole (72) along the radial direction of the rotating part (6); The first core body (731) and the first elastic member are located in the first sliding groove (751), the second core body (732) and the second elastic member are located in the second sliding groove (752), and the first sliding groove (751) and the second sliding groove (752) are both arranged obliquely relative to the valve hole (72).

8. The motor cooling system of any one of claims 2 to 7, wherein: When the rotating part (6) is a rotating shaft of the oil pumping part (1), the rotating shaft is provided with a groove (63) which communicates with the oil channel (60), the groove (63) is arranged along the circumferential direction of the rotating shaft, and the valve seat (71) is arranged in the groove (63); When the rotating part (6) is a rotor shaft (61) of the rotor, the end of the rotor shaft (61) which is connected with the external transmission part (62) is provided with a groove (63), the groove (63) is formed between the rotor shaft (61) and the external transmission part (62) and arranged along the circumferential direction of the rotor shaft (61), and the valve seat (71) is arranged in the groove (63).

9. The motor cooling system of claim 8, wherein: The valve seat (71) is interference-fitted in the groove (63); and / or, The external transmission part (62) is a speed reducer connected with the motor.

10. A vehicle drive assembly, comprising: The vehicle drive assembly is provided with a motor and the motor cooling system of any one of claims 1 to 9.

Images