Electric drive system, power device and vehicle

Abstract

The invention provides an electric drive system, a power device and a vehicle. Comprises: a housing (10) having an accommodating cavity (101); the motor (20) is mounted in the accommodating cavity (101); an oil pump (41); the first oil supply channel (50) is connected with an outlet of the oil pump (41) and used for supplying lubricating oil to the motor (20); and the cooler (42) is arranged on the first oil supply channel (50) and is used for cooling the lubricating oil supplied to the motor (20). In the technical scheme of the embodiment of the invention, the lubricating oil pumped out by the oil pump (41) is conveyed to the motor (20) by arranging the first oil supply channel (50), and the cooler (42) is arranged on the first oil supply channel (50), so that only the lubricating oil flowing to the motor (20) is cooled, the cooling capacity generated by the cooler (42) is fully utilized to cool the motor (20), and the utilization rate of the cooling capacity is improved.

Description

Electric drive systems, power units, and vehicles Technical Field

[0001] The present application belongs to the field of electric drive technology, and more specifically, relates to an electric drive system, a power device and a vehicle. Background Art

[0002] The statements herein provide only background information relevant to this application and do not necessarily constitute prior art. Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. The electric drive system is the power source of electric vehicles. Therefore, the smooth operation of the electric drive system is a prerequisite for ensuring the normal operation of electric vehicles.

[0003] To ensure the smooth operation of the electric drive system, it is necessary to ensure that the oil circuit in the electric drive system is smooth so that the electric drive system can be lubricated and cooled by lubricating oil. However, the current electric drive system has a low utilization rate of the cooling capacity of the lubricating oil, which affects the efficiency of the electric drive system.

[0004] Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide an electric drive system and a power device, including but not limited to solving the problem of low cooling capacity utilization of electric drive systems in related technologies.

[0006] In a first aspect, an embodiment of the present application provides an electric drive system, comprising:

[0007] A housing having a receiving cavity;

[0008] The motor is installed in the accommodating cavity;

[0009] An oil pump, used for pumping lubricating oil, wherein the inlet of the oil pump is connected to the accommodating chamber;

[0010] a first oil supply passage connected to the outlet of the oil pump and extending to the motor, for supplying lubricating oil to the motor; and

[0011] The cooler is arranged on the first oil supply channel and is used for cooling the lubricating oil supplied to the motor.

[0012] In the technical solution of the embodiment of the present application, a first oil supply channel is set to deliver the lubricating oil pumped out by the oil pump to the motor, and a cooler is set on the first oil supply channel, so that only the lubricating oil flowing to the motor is cooled, so that the cooling capacity generated by the cooler can be fully utilized to cool the motor, thereby improving the utilization rate of the cooling capacity.

[0013] In some embodiments, the motor includes a rotating shaft having an inner hole formed in the axial direction, and the first oil supply channel includes an oil distribution channel connecting the outlet of the cooler and the inner hole.

[0014] Through the above structural design, an inner hole is set axially in the rotating shaft of the motor, and the oil branch channel of the first oil supply channel connects the cooler and the inner hole of the rotating shaft, so that the cooled lubricating oil can enter the rotating shaft, thereby cooling the rotating shaft.

[0015] In some embodiments, the inner hole passes through the rotating shaft along the axial direction of the rotating shaft.

[0016] Through the above structural design, the inner hole passes through the rotating shaft, so that the lubricating oil can flow through the entire rotating shaft along the axial direction of the rotating shaft, so as to better cool the rotating shaft, improve the cooling effect, and also facilitate processing and manufacturing.

[0017] In some embodiments, the diameter of one end of the inner hole connected to the oil distribution channel is smaller than the diameter of the other end of the inner hole.

[0018] Through the above structural design, since a large centrifugal force will be generated inside the rotating shaft when the motor is running, the diameter of the end of the inner hole connected to the oil distribution channel is set to be smaller, so that the centrifugal force of the lubricating oil at one end of the inner hole close to the oil distribution channel is smaller than that at the other end, so that the lubricating oil in the inner hole can pass through the inner hole more smoothly along the axial direction of the rotating shaft, avoiding or reducing the backflow of the lubricating oil and improving the cooling effect.

[0019] In some embodiments, the housing includes a main housing and an end cover covering the main housing. The end cover is provided with an axial hole, and the rotating shaft is rotatably installed in the axial hole.

[0020] Through the above structural design, the main shell and the end cover are provided to facilitate processing and manufacturing, and also to facilitate the installation and fixation of the motor. In addition, a shaft hole is provided on the end cover, and the rotating shaft is rotatably installed in the shaft hole to stably support the rotating shaft.

[0021] In some embodiments, the casing further includes a sealing cover mounted on the end cover, the sealing cover covers the shaft hole, an oil chamber is formed between the sealing cover and the end cover, the oil chamber is connected to the inner hole, and the oil channel is connected to the oil chamber.

[0022] Through the above structural design, a sealing cover is provided on the end cover to play a good sealing and protective role, prevent impurities from entering the casing, and prevent lubricating oil leakage; and an oil chamber is formed between the sealing cover and the end cover, which can be easily processed and manufactured. The oil channel is connected to the oil chamber, and the oil chamber is connected to the inner hole, so that the oil channel and the inner hole are connected, and the connection is convenient.

[0023] In some embodiments, a connecting pipe is provided in the oil chamber, one end of the connecting pipe is connected to the inner hole, and the other end of the connecting pipe is connected to the oil distribution channel.

[0024] Through the above structural design, a connecting pipe is set in the oil chamber to facilitate connection with the inner hole of the rotating shaft, so as to facilitate guiding the lubricating oil in the oil distribution channel into the rotating shaft, thereby improving the cooling efficiency and improving the utilization rate of the cooling capacity.

[0025] In some embodiments, the connecting tube and the sealing cover are integrally formed.

[0026] Through the above structural design, the connecting pipe and the sealing cover are set as an integrated structure, which improves the connection strength between the connecting pipe and the sealing cover and is also convenient for processing and manufacturing.

[0027] In some embodiments, the connecting pipe passes through the sealing cap, which makes it easy to connect the connecting pipe to the oil distribution channel and facilitates assembly, especially when a pipe fitting can be used as the oil distribution channel, it is convenient to connect the pipe fitting to the connecting pipe.

[0028] In some embodiments, the housing further includes a support plate for supporting the connecting pipe, and the support plate is mounted on the cover.

[0029] Through the above structural design, a support plate is provided to support the connecting pipe so that the connecting pipe can be installed on the cover, which is convenient for assembly.

[0030] In some embodiments, the connecting pipe and the support plate are integrally formed to facilitate processing and manufacturing. For example, the connecting pipe can be directly stamped out of the support plate, which is convenient and efficient to manufacture.

[0031] In some embodiments, the edge of the support plate is clamped between the cover and the end cap.

[0032] Through the above structural design, the edge of the support plate is clamped between the cover and the end cover, so that when the cover is fixed to the end cover, the support plate can be clamped and fixed, thereby supporting the connecting pipe, which facilitates assembly.

[0033] In some embodiments, a receiving groove is provided on the surface of the sealing cover facing the end cover, and the support plate is placed in the receiving groove.

[0034] Through the above structural design, a receiving groove is provided on the cover to accommodate the support plate, which facilitates positioning and installation of the support plate, facilitates assembly, and can improve integration and reduce volume.

[0035] In some embodiments, the sidewall of the accommodating groove extends from the surface of the cover facing the end cap to the surface away from the end cap in a direction away from the rotation axis, and the edge of the support plate is adapted to the accommodating groove.

[0036] Through the above-mentioned structural design, the width of the mouth of the accommodating groove can be set to be smaller than the width of the bottom. In this way, when the support plate is installed in the accommodating groove, the side wall of the accommodating groove can be positioned and clamped to the edge of the support plate, thereby preventing the support plate from falling off and facilitating assembly.

[0037] In some embodiments, the oil branch passage includes a first sub-oil passage opened on the end cover, and the first sub-oil passage is communicated with the oil chamber.

[0038] Through the above structural design, the first sub-oil channel is provided on the end cover, which can facilitate manufacturing, improve integration, and facilitate communication with the inner hole of the rotating shaft through the oil cavity.

[0039] In some embodiments, a connecting oil passage connecting the first sub-oil passage and the oil chamber is opened in the cover.

[0040] Through the above structural design, a connecting oil channel connected to the oil chamber is provided on the cover, and the connecting oil channel is connected to the first sub-oil channel, which can facilitate processing and manufacturing.

[0041] In some embodiments, a first oil hole and a second sub-oil channel communicating with the first oil hole and the first sub-oil channel are formed on the main shell; and the cooler is communicated with the first oil hole.

[0042] Through the above structural design, the first oil hole and the first sub-oil channel are set on the main housing, and the first sub-oil channel is connected to the second sub-oil channel, so that the oil channel can be integrated into the housing to improve the integration level, and the housing can also protect the oil channel.

[0043] In some embodiments, the oil distribution channel includes a connecting pipe connecting the oil chamber and the cooler.

[0044] Through the above structural design, a connecting pipe is provided to connect the cooler and the oil chamber, which has a simple structure, is easy to process and manufacture, and reduces costs.

[0045] In some embodiments, a ring sleeve is provided on the cover, the oil channel is connected to the ring sleeve, the rotating shaft extends into the ring sleeve, an oil seal ring is provided in the ring sleeve, and the oil seal ring is sleeved on the rotating shaft.

[0046] Through the above structural design, a ring sleeve is provided on the cover, the oil channel is connected to the ring sleeve, and the rotating shaft is extended into the ring sleeve, which can provide a certain support for the rotating shaft, and an oil seal ring is provided in the ring sleeve and sleeved on the rotating shaft, which can play a good sealing role, so that the lubricating oil in the ring sleeve enters the inner hole of the rotating shaft, preventing the lubricating oil from leaking, and improving the utilization rate of the cooling capacity and the cooling effect.

[0047] In some embodiments, an oil seal is installed in the shaft hole, and the oil seal is sleeved on the rotating shaft.

[0048] Through the above structural design, installing an oil seal in the shaft hole can play a good sealing role, allowing the lubricating oil in the oil chamber to enter the inner hole of the rotating shaft, preventing the lubricating oil in the oil chamber from leaking from the shaft hole, thereby improving the utilization rate of cooling capacity and cooling effect.

[0049] In some embodiments, a first bearing is provided in the shaft hole, the first bearing is sleeved on the rotating shaft, and an oil seal is provided on at least one side of the first bearing.

[0050] Through the above structural design, a first bearing is arranged in the shaft hole, which can well support the end of the rotating shaft so that it can rotate flexibly; and an oil seal is arranged on the side of the first bearing, which can play a good sealing role, so that the lubricating oil in the oil chamber enters the inner hole of the rotating shaft, preventing the lubricating oil in the oil chamber from leaking from the shaft hole, thereby improving the utilization rate of the cooling capacity and the cooling effect.

[0051] In some embodiments, a plurality of oil outlet holes are radially opened at the end of the rotating shaft, and each oil outlet hole is connected to the inner hole.

[0052] Through the above structural design, an oil outlet hole is opened at the end of the rotating shaft. When the rotating shaft rotates, part of the lubricating oil can be thrown out from the oil outlet hole to cool other parts of the motor and the stator, thereby improving the cooling effect.

[0053] In some embodiments, the motor includes a stator, which is installed in a casing. A second oil hole is opened on the casing at a position corresponding to the stator, and the outlet of the cooler is connected to the second oil hole.

[0054] Through the above structural design, a second oil hole is provided on the casing and is connected to the outlet of the cooler, so that the lubricating oil cooled by the cooler can enter the casing from the second oil hole to cool the stator.

[0055] In some embodiments, the cooler is mounted on the casing, and the outlet of the cooler is correspondingly connected to the second oil hole.

[0056] Through the above structural design, the outlet of the cooler is connected to the second oil hole, which can shorten the path so that the cooled lubricating oil can directly enter the second oil hole, thereby cooling the stator, simplifying the structure and reducing costs.

[0057] In some embodiments, the electric drive system also includes a transmission and a second oil supply channel. The transmission is connected to the motor and installed in the accommodating cavity. The second oil supply channel is connected to the outlet of the oil pump and is used to supply lubricating oil to the transmission.

[0058] Through the above structural design, a transmission is provided to be connected to the motor, so that the electric drive system is integrated with the transmission, the volume of the electric drive system is reduced, a second oil supply channel is provided, and the second oil supply channel is connected to the outlet of the oil pump, so that part of the lubricating oil pumped out by the oil pump can directly lubricate the transmission through the second oil supply channel to ensure a good lubrication effect of the transmission, and the cooled lubricating oil enters the motor instead of directly lubricating the transmission, so as to improve the utilization rate of cooling capacity.

[0059] In some embodiments, the second oil supply channel includes an oil guide pipe, one end of the oil guide pipe is connected to the outlet of the oil pump, and the other end of the oil guide pipe extends to the transmission.

[0060] Through the above structural design, an oil guide pipe is provided, which has a simple structure and can conveniently guide the lubricating oil pumped out by the oil pump to the transmission.

[0061] In some embodiments, the first oil supply passage is connected to an end of the motor away from the transmission.

[0062] Through the above structural design, the first oil supply channel is connected to the end of the motor away from the transmission, so that the lubricating oil cooled by the first oil supply channel can enter the motor from the end away from the transmission, thereby avoiding the transmission's consumption of cold energy in the lubricating oil and improving the utilization rate of cold energy.

[0063] In some embodiments, the accommodating chamber includes a first chamber and a second chamber, the motor is installed in the first chamber, and the transmission is installed in the second chamber.

[0064] By adopting the above solution, the accommodating chamber is divided into a first chamber and a second chamber, which can separate the motor and the transmission to avoid mutual influence between the motor and the transmission, and can better install and support the motor and the transmission to ensure stable operation of the motor and the transmission.

[0065] In some embodiments, the housing further includes a control box, which is located on one side of the first chamber. An accommodating space is formed between the control box and the first chamber, and the oil pump and the cooler are located in the accommodating space.

[0066] Through the above structural design, a control box is set on the casing to improve the integration and reduce the volume of the electric drive system; and the oil pump and cooler are arranged in the accommodating space between the control box and the first chamber, which can fully utilize the space, improve the integration and reduce the volume.

[0067] In some embodiments, the electric drive system further includes a filter for filtering the lubricating oil flowing out of the oil pump, the filter is connected to the outlet of the oil pump, and the cooler is connected to the filter.

[0068] Through the above structural design, a filter is set to filter impurities in the lubricating oil, so that the lubricating oil flows more smoothly, which is convenient for cooling the motor and preventing impurities from affecting the operation of the motor; and the filter is set between the oil pump and the cooler, which can avoid the loss of cooling capacity by the filter and improve the utilization rate of cooling capacity.

[0069] In a second aspect, an embodiment of the present application provides a power device, comprising the electric drive system as described in the above embodiment.

[0070] In a third aspect, an embodiment of the present application provides a vehicle comprising the electric drive system as described in the above embodiment.

[0071] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or exemplary technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0073] FIG1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0074] FIG2 is a schematic diagram of the three-dimensional structure of an electric drive system according to some embodiments of the present application;

[0075] FIG3 is a schematic front view of a partial structure of the electric drive system of FIG2 ;

[0076] FIG4 is a left-side structural diagram of the electric drive system in FIG3 ;

[0077] FIG5 is a schematic diagram of the right side structure of the electric drive system in FIG2;

[0078] FIG6 is a schematic cross-sectional view of the structure along line AA in FIG5 ;

[0079] FIG7 is an enlarged view of portion B in FIG6 ;

[0080] FIG8 is a block diagram of an oil circuit of an electric drive system according to some embodiments of the present application;

[0081] FIG9 is a schematic structural diagram of an electric drive system according to some other embodiments of the present application;

[0082] FIG10 is a block diagram of an oil circuit of an electric drive system according to some other embodiments of the present application;

[0083] FIG11 is a block diagram of an oil circuit of an electric drive system according to some further embodiments of the present application;

[0084] FIG12 is a schematic cross-sectional view of an electric drive system according to some embodiments of the present application;

[0085] FIG13 is an enlarged view of portion C in FIG12 ;

[0086] FIG14 is a schematic cross-sectional view of an end cover of a casing according to yet other embodiments of the present application;

[0087] FIG15 is a schematic cross-sectional view of an electric drive system according to some further embodiments of the present application;

[0088] FIG16 is a schematic cross-sectional view of an electric drive system according to some other embodiments of the present application;

[0089] FIG17 is a schematic cross-sectional view of an electric drive system according to some other embodiments of the present application;

[0090] FIG18 is a schematic cross-sectional structural diagram of an electric drive system according to some other embodiments of the present application.

[0091] Among them, the main marks of the drawings in the figure are:

[0092] 1000-Vehicle; 1001-Electric Drive System; 1002-Controller; 1003-Battery;

[0093] 10-housing; 101-accommodating chamber; 1011-first chamber; 1012-second chamber; 11-main housing; 111-partitioning portion; 1111-opening; 12-end cover; 121-shaft hole; 122-oil seal; 13-sealing cover; 130-oil chamber; 131-conduit portion; 132-accommodating groove; 133-groove; 134-ring; 135-oil seal ring; 14-cover; 141-mounting groove; 15-control box; 16-accommodating space;

[0094] 20-motor; 21-stator; 22-rotor; 221-rotating shaft; 2211-inner hole; 2212-oil outlet hole;

[0095] 30-Transmission;

[0096] 41- oil pump; 42- cooler; 43- filter;

[0097] 50 - first oil supply channel; 51 - oil branch channel; 511 - first sub-oil channel; 512 - connecting oil channel; 513 - second sub-oil channel; 514 - first oil hole; 515 - connecting pipe; 52 - second oil hole;

[0098] 60-second oil supply channel; 61-oil guide pipe;

[0099] 71-connecting pipe; 72-support plate;

[0100] 81-first bearing; 82-second bearing; 83-third bearing. DETAILED DESCRIPTION

[0101] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0102] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0103] In the description of the embodiments of this application, the technical terms "first," "second," etc., are used solely to distinguish between different objects and should not be understood to indicate or imply relative importance, or to implicitly specify the quantity, specific order, or primary-secondary relationship of the technical features indicated. Therefore, a feature designated "first" or "second" may explicitly or implicitly include one or more of such features.

[0104] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments in any suitable manner.

[0105] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0106] In the description of the embodiments of this application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more (including two groups), and "multiple sheets" refers to two or more (including two sheets). "Several" means one or more, unless otherwise specifically defined.

[0107] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0108] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0109] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, when an element is referred to as being “fixed to” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0110] In the description of the embodiments of this application, unless otherwise specified or limited, the technical term "adjacent" refers to proximity in position. For example, if there are three components A1, A2, and B, and the distance between A1 and B is greater than the distance between A2 and B, then A2 is closer to B than A1, that is, A2 is adjacent to B, or B is adjacent to A2. For another example, when there are multiple components C, the multiple components C are C1, C2, ..., C N , when one of the C components, such as C2, is closer to the B component than other C components, then B is adjacent to C2, or it can be said that C2 is adjacent to B.

[0111] Drive systems that use electric motors as their power source are generally referred to as electric drives. The motor is integrated into the housing of the electric drive to form an electric drive system. The motor consists of a stator and a rotor. The stator drives the rotor to rotate, converting electrical energy into mechanical energy, thereby outputting torque. As the stator drives the rotor, it also generates heat, necessitating cooling of the motor. To ensure proper operation of the motor, lubricating oil is required to dissipate heat from the stator and rotor and lubricate the rotor.

[0112] In some cases, the motor doesn't directly output power; a transmission is incorporated into the motor housing. For example, in applications requiring high torque, a speed reducer is often incorporated into the motor housing to boost torque and output power through the speed reducer. Speed ​​reducers are also used in applications requiring lower drive speeds. Furthermore, in applications requiring higher speeds, a speed increaser is also required to increase the output speed. In other words, some electric drive systems incorporate a transmission. A transmission, also known as a gearbox, is a mechanism used to change the speed and torque of the motor. It can adjust the transmission ratio between the output and input shafts in fixed or step-by-step fashion. A transmission consists of a speed change mechanism and a control mechanism, and some vehicles also have a power take-off mechanism. The transmission mechanism typically uses conventional gears, although some use planetary gears. Conventional gear transmissions typically utilize sliding gears and synchronizers. Friction and wear occur during transmission operation, requiring lubrication to minimize wear.

[0113] As can be seen above, to ensure the smooth operation of the electric drive assembly, good lubrication and cooling are required. Therefore, the electric drive system is equipped with an oil circuit, a cooler, and an oil pump to pump the lubricating oil to achieve circulation, provide good lubrication, and remove the heat generated during operation.

[0114] The lubrication oil circuit in current electric drive systems typically pressurizes the oil through an oil pump, cools it down through a cooler, and then enters components like the transmission and motor for lubrication and cooling. However, this design consumes cooling energy as the oil passes through each component, resulting in low cooling capacity utilization and requiring a high-power cooler.

[0115] Cooling capacity is a concept of energy or a unit of energy. Cooling capacity is the total energy value of the target space's heat consumed by refrigeration equipment or heat transfer facilities (such as chillers) in a unit time or period of time through cooling, or the total energy value of the heat extracted from the target space.

[0116] Based on the above considerations, in order to solve the problem of low cooling capacity utilization of the electric drive system, an embodiment of the present application provides an electric drive system, which connects the oil pump outlet by setting a first oil supply channel to guide the lubricating oil to the motor, thereby lubricating the motor; and a cooler is set on the first oil supply channel, so that only the lubricating oil in the first oil supply channel can be cooled, so that the cooled lubricating oil is used to lubricate and cool the motor, thereby improving the cooling effect and improving the cooling capacity utilization.

[0117] The electric drive system disclosed in the embodiments of the present application can be used as a power source for power devices, such as power tools, electric bicycles, electric vehicles, ships, spacecraft, etc. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0118] For the convenience of explanation, a power device is provided in accordance with an embodiment of the present application, and the power device is described by taking a vehicle as an example.

[0119] Please refer to Figure 1, which is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a new energy vehicle, which can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. The interior of the vehicle 1000 is provided with an electric drive system 1001, which can be provided at the bottom, head, or tail of the vehicle 1000 to drive the vehicle 1000 to move forward. The vehicle 1000 can also include a controller 1002 and a battery 1003. The controller 1002 is used to control the operation of the electric drive system 1001, and the battery 1003 is used to power the electric drive system 1001.

[0120] Please refer to Figures 2 to 8. Figure 2 is a schematic diagram of the three-dimensional structure of the electric drive system 1001 of some embodiments of the present application. Figure 3 is a schematic diagram of the front structure of the electric drive system 1001 after removing the cover 14 of some embodiments of the present application. Figure 4 is a schematic diagram of the left structure of the electric drive system 1001 of some embodiments of the present application after removing the cover 14. Figure 5 is a schematic diagram of the right structure of the electric drive system 1001 of some embodiments of the present application. Figure 6 is a schematic diagram of the cross-sectional structure of the electric drive system 1001 of some embodiments of the present application, and its section line is the center line AA of Figure 5. Figure 7 is an enlarged view of part B in Figure 6. Figure 8 is a block diagram of the oil circuit of the electric drive system 1001 of some embodiments of the present application.

[0121] An electric drive system 1001 includes a housing 10, a motor 20, an oil pump 41, a first oil supply passage 50, and a cooler 42. A housing 10 is provided with a chamber 101. The motor 20 is mounted in the chamber 101, so that the housing 10 supports and protects the motor 20. The inlet of the oil pump 41 is connected to the chamber 101 so that the lubricating oil in the chamber 101 can flow back into the oil pump 41, where the lubricating oil is pressurized and pumped by the oil pump 41. The first oil supply passage 50 is connected to the outlet of the oil pump 41 and extends to the motor 20 to guide the lubricating oil pumped by the oil pump 41 to the motor 20. The cooler 42 is provided on the first oil supply passage 50 to cool the lubricating oil in the first oil supply passage 50. This allows all the cooled lubricating oil to flow to the motor 20 to lubricate and cool the motor 20, thereby reducing cooling loss and improving cooling utilization.

[0122] The housing 10 is the housing of the drive system. The oil pump 41 is a pump component used to pressurize the lubricating oil and pump the lubricating oil. The oil pump 41 can be a gear pump, a vane pump, a piston pump, a centrifugal pump, etc., which are not limited here.

[0123] The motor 20 is a power source component of the drive system. The motor 20 refers to an electromagnetic device that realizes electric energy conversion or transmission according to the law of electromagnetic induction.

[0124] The first oil supply passage 50 is a passage in the drive system for guiding the flow of lubricating oil.

[0125] The cooler 42 refers to a device for cooling the lubricating oil. The cooler 42 may be an air cooling device, a heat exchanger, a semiconductor refrigeration device, etc., which is not limited here.

[0126] In the technical solution of the embodiment of the present application, a first oil supply channel 50 is provided to deliver the lubricating oil pumped out by the oil pump 41 to the motor 20, and a cooler 42 is provided on the first oil supply channel 50, so that only the lubricating oil flowing to the motor 20 is cooled, so that the cooling capacity generated by the cooler 42 can be fully utilized to cool the motor 20, thereby improving the utilization rate of the cooling capacity.

[0127] In some embodiments, as shown in FIG6 , a motor 20 includes a rotor 22 and a stator 21. The rotor 22 is located within the stator 21 and is driven by the stator 21 to rotate, thereby achieving power output. Both the rotor 22 and the stator 21 are mounted within the housing 10 , which supports and protects the rotor 22 and the stator 21 .

[0128] In some embodiments, referring to FIG6 , the rotor 22 includes a rotating shaft 221 , which is a shaft member disposed at the center of the rotor 22 . The rotating shaft 221 is provided to transmit power and is rotatably mounted within the housing 10 . The housing 10 supports the rotating shaft 221 , thereby supporting the rotor 22 .

[0129] In some embodiments, referring to FIG6 , the rotating shaft 221 is provided with an inner hole 2211. The inner hole 2211 is a hole structure provided in the rotating shaft 221. The inner hole 2211 extends axially along the rotating shaft 221. The first oil supply passage 50 is connected to the inner hole 2211 of the rotating shaft 221, thereby allowing cooled lubricating oil to enter the rotating shaft 221 to cool the rotor 22.

[0130] In some embodiments, as shown in FIG6 , the first oil supply passage 50 includes an oil distribution passage 51 that connects the outlet of the cooler 42 with the inner bore 2211. The oil distribution passage 51 is provided to connect the cooler 42 with the inner bore 2211 of the rotating shaft 221, thereby directing cooled lubricating oil into the rotating shaft 221, cooling the rotor 22 and facilitating assembly. The oil distribution passage 51 is a channel structure used to guide the flow of lubricating oil.

[0131] In some embodiments, the inner hole 2211 passes through the rotating shaft 221 along the axial direction of the rotating shaft 221, that is, the two ends of the inner hole 2211 extend to the two end surfaces of the rotating shaft 221 respectively, so that the inner hole 2211 forms a through hole structure extending along the axial direction of the rotating shaft 221, so that the lubricating oil can enter from one end of the rotating shaft 221 and flow out from the other end, so that the lubricating oil flows through the entire rotating shaft 221 along the axial direction of the rotating shaft 221, so as to better cool the rotating shaft 221, improve the cooling effect, and also facilitate processing and manufacturing.

[0132] In some embodiments, referring to Figures 6 and 7 , the diameter of the end of inner hole 2211 connected to oil distribution passage 51 is smaller than the diameter of the other end of inner hole 2211. Because a significant centrifugal force is generated within rotating shaft 221 during operation of motor 20, and inner hole 2211 is a through-hole structure provided within rotating shaft 221, centrifugal force is also exerted on the lubricating oil at both ends of inner hole 2211. This results in a certain amount of back pressure on the end of inner hole 2211 near oil distribution passage 51. When the diameter of the end of the inner hole 2211 connected to the oil distribution channel 51 is set to be smaller, the centrifugal force of the lubricating oil at one end of the inner hole 2211 close to the oil distribution channel 51 will be smaller than the centrifugal force of the lubricating oil at the other end of the inner hole 2211. This will make it easier for the lubricating oil to flow out from the end of the inner hole 2211 away from the oil distribution channel 51, thereby forming a negative pressure in the inner hole 2211, and the farther the axial distance from the oil distribution channel 51 along the rotating shaft 221, the greater the negative pressure, so that the lubricating oil can smoothly pass through the inner hole 2211 along the axial direction of the rotating shaft 221, avoiding or reducing the backflow of the lubricating oil and improving the cooling effect.

[0133] In some embodiments, referring to Figures 2, 5, and 6, the housing 10 includes a main housing 11 and an end cover 12. The end cover 12 covers the main housing 11 and defines a shaft hole 121. A rotating shaft 221 is rotatably mounted in the shaft hole 121. The main housing 11 and the end cover 12 are provided to facilitate manufacturing and installation of the motor 20. The shaft hole 121 is defined in the end cover 12. The rotating shaft 221 is rotatably mounted in the shaft hole 121 to provide stable support for the rotating shaft 221.

[0134] In some embodiments, referring to Figures 2, 5, and 6, the housing 10 further includes a cover 13, which is mounted on the end cover 12 and covers the shaft hole 121, thereby forming an oil chamber 130 between the cover 13 and the end cover 12, the oil chamber 130 being connected to the inner hole 2211, and the oil channel 51 being connected to the oil chamber 130. The cover 13 is provided on the end cover 12 to provide a good sealing and protective effect, thereby preventing impurities from entering the housing 10 and preventing lubricating oil from leaking. Forming the oil chamber 130 between the cover 13 and the end cover 12 facilitates processing and manufacturing, and the oil channel 51 is connected to the oil chamber 130, which is connected to the inner hole 2211, so that the oil channel 51 is connected to the inner hole 2211, and the connection is convenient.

[0135] In some embodiments, the oil distribution channel 51 can also be directly connected to the inner hole 2211 of the rotating shaft 221. For example, when a pipe fitting is used as the oil distribution channel 51, the pipe fitting can be connected to the inner hole 2211 of the rotating shaft 221. In this way, there is no need to set a cover 13, thereby simplifying the structure and reducing costs.

[0136] In some embodiments, as shown in Figures 2, 6, and 7, a connecting tube 71 is provided within the oil chamber 130. This connecting tube 71 is a tubular structure that guides the flow of lubricating oil. One end of the connecting tube 71 is connected to the inner hole 2211, and the other end of the connecting tube 71 is in communication with the oil distribution passage 51. Providing the connecting tube 71 within the oil chamber 130 facilitates connection with the inner hole 2211 of the rotating shaft 221, facilitating the directing of lubricating oil from the oil distribution passage 51 into the rotating shaft 221. This improves cooling efficiency and increases cooling capacity utilization.

[0137] In some embodiments, the connecting tube 71 is inserted into the inner hole 2211 to facilitate connection and enable the connecting tube 71 to communicate with the inner hole 2211 .

[0138] In some embodiments, the connecting tube 71 and the inner hole 2211 are clearance-fitted to facilitate the insertion of the connecting tube 71 into the inner hole 2211 , and to avoid and reduce friction between the rotating shaft 221 and the connecting tube 71 when the rotating shaft 221 rotates.

[0139] In some embodiments, the connecting tube 71 may also use a rotatable connector, and the connecting tube 71 may be interference fit with the inner hole 2211 to achieve good sealing.

[0140] In some embodiments, the connecting tube 71 and the inner hole 2211 are clearance-fitted, and the diameter of the end of the inner hole 2211 connected to the oil distribution channel 51 is smaller than the diameter of the other end of the inner hole 2211. This allows the lubricating oil to flow out more easily from the end of the inner hole 2211 away from the oil distribution channel 51, reducing or preventing the lubricating oil from flowing back through the gap between the connecting tube 71 and the inner surface of the inner hole 2211, thereby reducing the cooling loss of the lubricating oil and improving the cooling efficiency.

[0141] In some embodiments, the connecting tube 71 and the cover 13 are integrally formed. Providing the connecting tube 71 and the cover 13 as an integral structure improves the connection strength between the connecting tube 71 and the cover 13 and also facilitates processing and manufacturing.

[0142] In some embodiments, the connecting tube 71 and the sealing cover 13 can be manufactured separately, and then the connecting tube 71 can be fixed to the sealing cover 13 by welding or other methods.

[0143] In some embodiments, referring to Figures 2 and 6 , the oil channel 51 includes a first sub-oil channel 511, which is connected to the oil chamber 130. The first sub-oil channel 511 is provided on the end cover 12. In other words, the first sub-oil channel 511 connected to the oil chamber 130 is directly machined and manufactured on the end cover 12. In this way, when the end of the rotating shaft 221 extends into the oil chamber 130, it can be connected to the first sub-oil channel 511, which facilitates assembly and manufacturing, improves integration, and facilitates communication with the inner hole 2211 of the rotating shaft 221 through the oil chamber 130. The first sub-oil channel 511 refers to a channel structure provided in the end cover 12 for guiding the flow of lubricating oil.

[0144] In some embodiments, a connecting oil passage 512 is provided in the cover 13, and the connecting oil passage 512 connects the first sub-oil passage 511 with the oil chamber 130. Providing a connecting oil passage 512 in the cover 13 to connect the first sub-oil passage 511 with the oil chamber 130 can facilitate manufacturing. At this time, the first sub-oil passage 511 on the end cover 12 is not directly connected to the oil chamber 130, but is connected to the first sub-oil passage 511, and the first sub-oil passage 511 is connected to the oil chamber 130. This structure is convenient for processing and manufacturing, and is convenient for the design of the oil passage 51. In addition, this structure can make the rotating shaft 221 closer to the cover 13, thereby improving the integration and reducing the volume of the electric drive system 1001. The connecting oil passage 512 refers to a channel structure provided in the cover 13 for guiding the flow of lubricating oil.

[0145] In some embodiments, a conduit portion 131 may be provided on the cover 13 , and a connecting oil passage 512 may be provided in the conduit portion 131 to facilitate the processing and manufacturing of the connecting oil passage 512 .

[0146] In some embodiments, the main housing 11 is provided with a first oil hole 514 and a second sub-oil passage 513. The second sub-oil passage 513 connects the first oil hole 514 with the first sub-oil passage 511, and the cooler 42 is connected to the first oil hole 514. Providing the first oil hole 514 and the second sub-oil passage 513 in the main housing 11 and connecting the first sub-oil passage 511 with the second sub-oil passage 513 allows the oil distribution passage 51 to be integrated into the housing 10, thereby improving the integration level. The housing 10 also provides protection for the oil distribution passage 51.

[0147] The second sub-oil channel 513 refers to a channel structure provided in the main housing 11 for guiding the flow of lubricating oil.

[0148] The first oil hole 514 refers to a channel structure provided in the main housing 11 for guiding the flow of lubricating oil.

[0149] In some embodiments, pipes may also be provided outside the main housing 11 to connect the cooler 42 and the first sub-oil channel 511 for ease of manufacture and assembly.

[0150] In some embodiments, the cooler 42 may be mounted on the main housing 11 , and the outlet of the cooler 42 may be directly connected to the first oil hole 514 to shorten the oil circuit and reduce the loss of cooling capacity of the lubricating oil.

[0151] 6 , a first bearing 81 is disposed in the shaft hole 121 and is sleeved on the rotating shaft 221. The first bearing 81 disposed in the shaft hole 121 can well support the end of the rotating shaft 221 so that the rotor 22 can rotate flexibly.

[0152] In some embodiments, referring to FIG6 , the end of the rotating shaft 221 is provided with a plurality of oil outlet holes 2212. Each oil outlet hole 2212 is radially arranged and communicates with the inner hole 2211. The oil outlet holes 2212 are provided at the end of the rotating shaft 221. As the rotating shaft 221 rotates, some lubricating oil can be ejected from the oil outlet holes 2212 to cool other parts of the rotor 22 and the stator 21, thereby improving the cooling effect.

[0153] In some embodiments, an oil outlet hole 2212 may be provided at one end of the rotating shaft 221 close to the oil distribution channel 51 , so as to lubricate and cool the end of the motor 20 close to the oil distribution channel 51 .

[0154] In some embodiments, an oil outlet hole 2212 may be provided at the end of the rotating shaft 221 away from the oil distribution channel 51 , so as to lubricate and cool the end of the motor 20 away from the oil distribution channel 51 .

[0155] In some embodiments, oil outlet holes 2212 may be provided at opposite ends of the rotating shaft 221 , respectively, to lubricate and cool the opposite ends of the motor 20 .

[0156] In some embodiments, referring to Figures 2, 4, and 6, a second oil hole 52 is provided in the housing 10. The second oil hole 52 is located at a position corresponding to the stator 21, and the outlet of the cooler 42 is connected to the second oil hole 52. The second oil hole 52 is provided in the housing 10 and is connected to the outlet of the cooler 42 so that lubricating oil cooled by the cooler 42 can enter the housing 10 through the second oil hole 52 to cool the stator 21. The second oil hole 52 is a channel structure provided in the housing 10 for guiding the flow of lubricating oil.

[0157] In some embodiments, the cooler 42 is mounted on the housing 10, and the outlet of the cooler 42 is connected to the second oil hole 52. Connecting the outlet of the cooler 42 to the second oil hole 52 can shorten the path so that the cooled lubricating oil can directly enter the second oil hole 52, thereby cooling the stator 21. It can also simplify the structure and reduce costs.

[0158] In some embodiments, the outlet of the cooler 42 may also be connected to the second oil hole 52 through a pipe.

[0159] In some embodiments, when the housing 10 includes a main housing 11 , the second oil hole 52 is provided on the main housing 11 for ease of processing and manufacturing.

[0160] In some embodiments, the second oil hole 52 may be extended along the radial direction of the main shell 11 to shorten the oil path, reduce cooling loss, and improve cooling utilization.

[0161] In some embodiments, the first oil hole 514 and the second oil hole 52 may overlap, that is, one oil hole is provided on the main housing 11 to serve as both the first oil hole 514 and the second oil hole 52. Of course, the first oil hole 514 and the second oil hole 52 may also be provided separately.

[0162] In some embodiments, the electric drive system 1001 further includes a transmission 30, which is connected to the motor 20 and is mounted in the accommodating cavity 101. The transmission 30 is provided to connect to the motor 20, thereby integrating the transmission 30 into the electric drive system 1001 and reducing the size of the electric drive system 1001.

[0163] In some embodiments, the electric drive system 1001 further includes a second oil supply channel 60, which is connected to the outlet of the oil pump 41 and is used to supply lubricating oil to the transmission 30. Providing the second oil supply channel 60 and connecting it to the outlet of the oil pump 41 allows a portion of the lubricating oil pumped by the oil pump 41 to directly lubricate the transmission 30 through the second oil supply channel 60, thereby ensuring good lubrication of the transmission 30. Furthermore, the cooled lubricating oil enters the motor 20 without directly lubricating the transmission 30, thereby improving cooling capacity utilization.

[0164] In some embodiments, second oil supply passage 60 includes an oil conduit 61, one end of which is connected to the outlet of oil pump 41 and the other end of which extends to transmission 30. Providing oil conduit 61 to guide lubricating oil pumped by oil pump 41 to transmission 30 provides a simple structure and facilitates assembly and design.

[0165] In some embodiments, a channel may also be provided on the housing 10 to guide the lubricating oil to flow to the transmission 30 .

[0166] In some embodiments, referring to FIG6 , the housing chamber 101 includes a first chamber 1011 and a second chamber 1012. The motor 20 is mounted in the first chamber 1011, and the transmission 30 is mounted in the second chamber 1012. Separating the housing chamber 101 into the first chamber 1011 and the second chamber 1012 separates the motor 20 from the transmission 30 to prevent mutual interference between the motor 20 and the transmission 30. Furthermore, the motor 20 and the transmission 30 can be better mounted and supported, ensuring stable operation.

[0167] In some embodiments, a partition 111 is provided in the housing 10. The partition 111 divides the accommodating chamber 101 into a first chamber 1011 and a second chamber 1012 to prevent mutual interference between the motor 20 in the first chamber 1011 and the transmission 30 in the second chamber 1012. The partition 111 is provided with an opening 1111, through which the rotating shaft 221 passes, thereby connecting to the transmission 30. In this way, the rotating shaft 221 can be supported by the partition 111 to ensure smooth rotation.

[0168] In some embodiments, a second bearing 82 is installed in the opening 1111 . The second bearing 82 is sleeved on the rotating shaft 221 to stably support the rotating shaft 221 so that the rotating shaft 221 can rotate smoothly.

[0169] In some embodiments, the rotating shaft 221 may be supported by the first bearing 81 and the second bearing 82 so that the rotating shaft 221 can rotate smoothly.

[0170] In some embodiments, the end cover 12 is provided at one end of the main shell 11, and the casing 10 also includes a cover 14, which is installed at the other end of the main shell 11, and the two ends of the rotating shaft 221 are respectively supported on the end cover 12 and the cover 14 to stably support the rotating shaft 221, and also facilitate the processing and production of the main shell 11, and then facilitate the production of the casing 10, and also facilitate the installation of the motor 20.

[0171] In some embodiments, the cover 14 is located at an end of the main housing 11 away from the motor 20 , so that the cover 14 covers the transmission 30 to provide good protection and facilitate the processing and manufacturing of the housing 10 .

[0172] In some embodiments, a mounting groove 141 is defined on the cover 14 , and the rotating shaft 221 is supported in the mounting groove 141 to support the rotating shaft 221 .

[0173] In some embodiments, a third bearing 83 is installed in the installation groove 141 , and the third bearing 83 is sleeved on the rotating shaft 221 to support the rotating shaft 221 to ensure smooth rotation.

[0174] In some embodiments, the first bearing 81, the second bearing 82 and the third bearing 83 can cooperate to support the rotation to ensure smooth rotation of the rotating shaft 221. It is understandable that only the first bearing 81 and the third bearing 83 can be provided to protect the support rotation.

[0175] In some embodiments, when the inner hole 2211 in the rotating shaft 221 is a through hole and the third bearing 83 is installed in the mounting groove 141 of the cover 14 , the lubricating oil flowing out of the inner hole 2211 of the rotating shaft 221 can lubricate the third bearing 83 .

[0176] In some embodiments, the first oil supply passage 50 is connected to the end of the motor 20 away from the transmission 30. Connecting the first oil supply passage 50 to the end of the motor 20 away from the transmission 30 allows the lubricating oil cooled by the first oil supply passage 50 to enter the motor 20 from the end away from the transmission 30, thereby preventing the transmission 30 from consuming the cooling energy in the lubricating oil and improving the utilization of cooling energy.

[0177] In some embodiments, the transmission 30 is connected to the end of the rotating shaft 221 away from the oil chamber 130, so that the cooled lubricating oil can enter from the end of the rotating shaft 221 away from the transmission 30, avoiding the transmission 30 from consuming the cooling capacity in the lubricating oil and improving the utilization rate of the cooling capacity.

[0178] In some embodiments, referring to FIG. 2 and FIG. 3 , the housing 10 further includes a control box 15 to improve integration and reduce the volume of the electric drive system 1001 .

[0179] In some embodiments, the control box 15 is located on one side of the first chamber 1011, forming an accommodation space 16 between the control box 15 and the first chamber 1011. The oil pump 41 and the cooler 42 are located in the accommodation space 16. Placing the oil pump 41 and the cooler 42 in the accommodation space 16 between the control box 15 and the first chamber 1011 can fully utilize the space, improve integration, and reduce the size. It is understood that the oil pump 41 and the cooler 42 can also be located in other locations of the housing 10.

[0180] In some embodiments, the electric drive system 1001 also includes a filter 43, which is connected to the outlet of the oil pump 41, and the cooler 42 is connected to the filter 43. The filter 43 is used to filter the lubricating oil flowing out of the oil pump 41. The filter 43 is provided to filter impurities in the lubricating oil so that the lubricating oil flows more smoothly, which facilitates cooling the motor 20 and prevents impurities from affecting the operation of the motor 20. Placing the filter 43 between the oil pump 41 and the cooler 42 can avoid the loss of cooling capacity by the filter 43 and improve the utilization rate of cooling capacity. In addition, when a transmission 30 is provided, a filter 43 is provided to filter impurities in the lubricating oil, which can also make the impurities in the lubricating oil entering the transmission 30 smaller, so as to better lubricate the transmission 30.

[0181] The filter 43 refers to a structure for filtering the lubricating oil, and the filter 43 may be a filter screen, a filter cartridge, or the like.

[0182] In some embodiments, referring to Figures 6 and 8 , the lubricating oil returning from the first chamber 1011 and the second chamber 1012 flows into the oil pump 41. After being pressurized by the oil pump 41, it is divided into two paths. One path of the lubricating oil flows into the cooler 42 for cooling. A portion of the cooled lubricating oil flows into the shaft 221 of the rotor 22 to cool the rotor 22. Since the transmission 30 is connected to the shaft 221, the lubricating oil flowing out of the rotor 22 flows into the transmission 30 to lubricate the portion of the transmission 30 connected to the shaft 221 of the rotor 22. The other portion of the cooled lubricating oil flows into the stator 21 to cool the stator 21, and then flows back from the first chamber 1011 to the oil pump 41. The other path of the lubricating oil, pressurized by the oil pump 41, flows directly into the second chamber 1012 to lubricate the transmission 30, and then flows back from the second chamber 1012 to the oil pump 41. The lubricating oil cooled by the cooler 42 directly enters the motor 20, cooling it and improving the utilization of cooling capacity. The lubricating oil used to lubricate the transmission 30 is directly pressurized by the oil pump 41 and directed to the transmission 30 without being cooled by the cooler 42. This ensures good lubrication of the transmission 30 and prevents the cooled lubricating oil from absorbing the cooling capacity of the lubricating oil before entering the motor 20, improving the utilization of cooling capacity.

[0183] Please refer to FIG. 9 , which is a schematic cross-sectional view of an electric drive system 1001 according to some embodiments of the present application.

[0184] In some embodiments, the connecting pipe 71 passes through the cover 13. This makes it easy to connect the connecting pipe 71 to the oil distribution channel 51, which is convenient for assembly. In particular, when a pipe fitting can be used as the oil distribution channel 51, it is convenient to connect the pipe fitting to the connecting pipe 71.

[0185] In some embodiments, the connecting tube 71 and the sealing cover 13 are integrally formed, and the connecting tube 71 passes through the sealing cover 13 . This structure can be easily processed and manufactured, and is convenient for connecting the connecting tube 71 with pipe fittings.

[0186] In some embodiments, the oil channel 51 includes a connecting pipe 515, which connects the oil chamber 130 and the cooler 42. Providing the connecting pipe 515 to connect the cooler 42 and the oil chamber 130 has a simple structure, is easy to manufacture, and reduces costs.

[0187] In some embodiments, when a connecting pipe 71 is provided in the oil chamber 130 , the communicating pipe 515 may be connected to the connecting pipe 71 to facilitate assembly.

[0188] In some embodiments, when the connecting pipe 71 passes through the cover 13 and the oil distribution channel 51 includes a connecting pipe 515 , the connecting pipe 515 can be connected to the connecting pipe 71 , which is convenient for connection.

[0189] Please refer to FIG. 10 , which is a block diagram of an oil circuit of an electric drive system 1001 according to some embodiments of the present application.

[0190] In some embodiments, the lubricating oil returning from the first chamber 1011 and the second chamber 1012 flows into the oil pump 41. After being pressurized by the oil pump 41, it is divided into two paths. One path of the lubricating oil enters the cooler 42 for cooling. A portion of the cooled lubricating oil enters the rotating shaft 221 of the rotor 22 to cool the rotor 22. The lubricating oil flowing out of the rotor 22 enters the second chamber 1012 and flows back to the oil pump 41. The other portion of the cooled lubricating oil enters the stator 21 to cool it, and then flows back from the first chamber 1011 to the oil pump 41. The other path of the lubricating oil, pressurized by the oil pump 41, flows directly into the second chamber 1012 to lubricate the transmission 30, and then flows back from the second chamber 1012 to the oil pump 41. Since the lubricating oil cooled by the cooler 42 directly enters the motor 20, it cools the motor 20, thereby improving the utilization of cooling energy. The lubricating oil for lubricating the transmission 30 is directly pressurized from the oil pump 41 and is guided to the transmission 30 without being cooled by the cooler 42 to ensure good lubrication of the transmission 30. It can also avoid absorbing the cold energy of the lubricating oil before the cooled lubricating oil enters the motor 20, thereby improving the utilization rate of the cold energy.

[0191] Please refer to FIG. 11 , which is a block diagram of the oil circuit of the electric drive system 1001 according to some embodiments of the present application.

[0192] In some embodiments, the lubricating oil returning from the first chamber 1011 and the second chamber 1012 flows into the oil pump 41. After being pressurized by the oil pump 41, it is divided into two paths. One path of the lubricating oil enters the cooler 42 for cooling. The cooled lubricating oil then enters the motor 20 to cool the motor 20. The motor 20 includes a stator 21 and a rotor 22. A portion of the cooled lubricating oil enters the rotating shaft 221 of the rotor 22 to cool the rotor 22. The lubricating oil flowing out of the rotor 22 enters the first chamber 1011 and flows back to the oil pump 41. The other portion of the cooled lubricating oil enters the stator 21 to cool the stator 21, and then flows back from the first chamber 1011 to the oil pump 41. The other path of lubricating oil, pressurized by the oil pump 41, directly enters the second chamber 1012 to lubricate the transmission 30, and then flows back from the second chamber 1012 to the oil pump 41. The lubricating oil cooled by the cooler 42 directly enters the motor 20, cooling it and improving the utilization of cooling capacity. The lubricating oil used to lubricate the transmission 30 is directly pressurized by the oil pump 41 and directed to the transmission 30 without being cooled by the cooler 42. This ensures good lubrication of the transmission 30 and prevents the cooled lubricating oil from absorbing the cooling capacity of the lubricating oil before entering the motor 20, improving the utilization of cooling capacity.

[0193] Please refer to Figures 12 and 13. Figure 12 is a schematic cross-sectional view of the electric drive system 1001 according to some embodiments of the present application. Figure 13 is an enlarged view of section C in Figure 12.

[0194] In some embodiments, the housing 10 further includes a support plate 72 mounted on the cover 13. The support plate 72 supports the connecting pipe 71. In other words, the connecting pipe 71 is mounted on the support plate 72 and supported by the support plate 72. The support plate 72 is mounted on the cover 13 to support the connecting pipe 71 in the oil chamber 130, facilitating assembly.

[0195] In some embodiments, the connecting tube 71 and the support plate 72 are integrally formed to facilitate processing and manufacturing. For example, the connecting tube 71 can be directly stamped out on the support plate 72, which is convenient and efficient to manufacture.

[0196] In some embodiments, the connecting tube 71 and the supporting plate 72 may be manufactured separately, and then the connecting tube 71 may be fixed to the supporting plate 72 by welding or other methods.

[0197] In some embodiments, referring to Figures 12 and 13 , a receiving groove 132 is defined on the surface of the cover 13 facing the end cap 12, and the support plate 72 is positioned within the receiving groove 132. Providing the receiving groove 132 on the cover 13 to accommodate the support plate 72 facilitates positioning and installation of the support plate 72, facilitating assembly, improving integration, and reducing size.

[0198] In some embodiments, a groove 133 is provided on the cover 13 corresponding to the middle area of ​​the support plate 72, so that the support plate 72 can be covered in the groove 133 and connected to the groove 133, so that the lubricating oil flowing out of the connecting oil channel 512 will enter the groove 133 and then enter the inner hole 2211 of the rotating shaft 221, which is convenient for assembly.

[0199] In some embodiments, referring to Figures 12 and 13, from the surface of the cover 13 facing the end cap 12 to the surface away from the end cap 12, the sidewalls of the accommodating groove 132 extend in a direction away from the rotating shaft 221. That is, along the depth direction of the accommodating groove 132, the sidewalls of the accommodating groove 132 extend in a direction away from the rotating shaft 221. Then, the width of the mouth of the accommodating groove 132 is set to be smaller than the width of the bottom of the accommodating groove 132, and the edge of the support plate 72 is adapted to the accommodating groove 132. By setting the width of the mouth of the accommodating groove 132 smaller than the width of the bottom of the accommodating groove 132, when the support plate 72 is fitted into the accommodating groove 132, the sidewalls of the accommodating groove 132 can position and hold the edge of the support plate 72, thereby preventing the support plate 72 from falling off and facilitating assembly.

[0200] The mouth of the accommodating groove 132 refers to an end of the accommodating groove 132 away from the bottom surface of the accommodating groove 132. The bottom of the accommodating groove 132 refers to the bottom of the accommodating groove 132 in the depth direction.

[0201] Please refer to FIG. 14 , which is a schematic cross-sectional view of the end cover 12 of the housing 10 according to some embodiments of the present application.

[0202] In some embodiments, the edge of the support plate 72 is clamped between the cover 13 and the end cap 12. Clamping the edge of the support plate 72 between the cover 13 and the end cap 12 allows the support plate 72 to be clamped and fixed when the cover 13 is fixed to the end cap 12, thereby supporting the connecting tube 71, facilitating assembly. Of course, the support plate 72 can also be fixed to the cover 13 using screws or other structures.

[0203] Please refer to FIG. 15 , which is a schematic cross-sectional view of the electric drive system 1001 according to some embodiments of the present application. The figure only shows a partial structure of the electric drive system 1001 .

[0204] In some embodiments, the cover 13 is provided with a sleeve 134. The sleeve 134 is an annular support structure with a central space. The oil distribution channel 51 is connected to the sleeve 134, that is, the oil distribution channel 51 is connected to the central space of the sleeve 134. The rotating shaft 221 extends into the sleeve 134, and the sleeve 134 is provided with an oil seal ring 135, which is sleeved on the rotating shaft 221. The sleeve 134 is provided on the cover 13, the oil distribution channel 51 is connected to the sleeve 134, and the rotating shaft 221 extends into the sleeve 134, which can provide a certain support for the rotating shaft 221. The oil seal ring 135 is provided in the sleeve 134 and sleeved on the rotating shaft 221, which can provide a good sealing effect, allowing the lubricating oil in the sleeve 134 to enter the inner hole 2211 of the rotating shaft 221, preventing lubricating oil leakage, and improving the utilization rate of cooling capacity and cooling effect.

[0205] Please refer to FIG. 16 , which is a schematic cross-sectional view of the electric drive system 1001 according to some embodiments of the present application. The figure only shows a partial structure of the electric drive system 1001 .

[0206] In some embodiments, an oil seal 122 is installed in the shaft hole 121. The oil seal 122 is an annular sealing structure. The oil seal 122 is sleeved on the rotating shaft 221. Installing the oil seal 122 in the shaft hole 121 provides a good seal, allowing the lubricating oil in the oil chamber 130 to enter the inner hole 2211 of the rotating shaft 221, preventing the lubricating oil in the oil chamber 130 from leaking out of the shaft hole 121, thereby improving the utilization rate of cooling energy and the cooling effect.

[0207] In some embodiments, when the first bearing 81 is disposed in the shaft hole 121, an oil seal 122 is disposed on at least one side of the first bearing 81. Providing the oil seal 122 on the side of the first bearing 81 provides a good seal, allowing the lubricating oil in the oil chamber 130 to enter the inner hole 2211 of the rotating shaft 221, thereby preventing the lubricating oil in the oil chamber 130 from leaking from the shaft hole 121, thereby improving the utilization rate of cooling energy and the cooling effect.

[0208] In some embodiments, oil seals 122 may be provided on both sides of the first bearing 81 to ensure a good sealing effect.

[0209] Please refer to FIG. 17 , which is a schematic cross-sectional structural diagram of an electric drive system 1001 according to some embodiments of the present application. The figure only shows a partial structure of the electric drive system 1001 .

[0210] In some embodiments, an oil seal 122 is provided on the side of the first bearing 81 away from the motor 20 . This structure not only provides a good sealing effect but also facilitates the assembly of the oil seal 122 .

[0211] Please refer to FIG. 18 , which is a schematic cross-sectional view of the electric drive system 1001 according to some embodiments of the present application. The figure only shows a partial structure of the electric drive system 1001 .

[0212] In some embodiments, an oil seal 122 is provided on the side of the first bearing 81 close to the motor 20. This structure not only provides a good sealing effect, but also allows part of the lubricating oil in the oil chamber 130 to flow to the first bearing 81 to lubricate the first bearing 81.

[0213] According to some embodiments of the present application, the present application provides an electric drive system 1001, including a housing 10, a motor 20, a transmission 30, an oil pump 41, a first oil supply channel 50, a second oil supply channel 60 and a cooler 42. A housing 10 is provided in the housing 10. The motor 20 and the transmission 30 are both installed in the housing 101, and the transmission 30 is connected to the motor 20. The inlet of the oil pump 41 is connected to the housing 101. The first oil supply channel 50 is connected to the outlet of the oil pump 41, and the first oil supply channel 50 extends to the motor 20 to guide the lubricating oil pumped by the oil pump 41 to the motor 20. The cooler 42 is provided on the first oil supply channel 50. The second oil supply channel 60 is connected to the outlet of the oil pump 41, and the second oil supply channel 60 extends to the transmission 30. The lubricating oil returning from the accommodating chamber 101 flows into the oil pump 41. After being pressurized by the oil pump 41, it is divided into two paths. One path of the lubricating oil enters the cooler 42 for cooling. A portion of the cooled lubricating oil enters the rotating shaft 221 of the rotor 22 to cool the rotor 22. Since the transmission 30 is connected to the rotating shaft 221, the lubricating oil flowing out of the rotor 22 enters the transmission 30 to lubricate the portion of the transmission 30 connected to the rotating shaft 221 of the rotor 22. The other portion of the cooled lubricating oil enters the stator 21 to cool the stator 21, and then flows back from the accommodating chamber 101 to the oil pump 41. The other path of lubricating oil, pressurized by the oil pump 41, enters the accommodating chamber 101 directly to lubricate the transmission 30, and then flows back from the accommodating chamber 101 to the oil pump 41. Since the lubricating oil cooled by the cooler 42 directly enters the motor 20, it cools the motor 20 and improves the utilization rate of the cooling capacity. The lubricating oil for lubricating the transmission 30 is directly pressurized from the oil pump 41 and is guided to the transmission 30 without being cooled by the cooler 42 to ensure good lubrication of the transmission 30. It can also avoid absorbing the cold energy of the lubricating oil before the cooled lubricating oil enters the motor 20, thereby improving the utilization rate of the cold energy.

[0214] According to some embodiments of the present application, the present application also provides a power device, including the electric drive system 1001 described in any of the above solutions.

[0215] According to some embodiments of the present application, the present application also provides a vehicle, comprising the electric drive system 1001 described in any of the above solutions.

[0216] According to some embodiments of the present application, the present application also provides a vehicle, which may include a power device as described in the above solution.

[0217] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An electric drive system, characterized in that: include: A housing having a receiving cavity; a motor, installed in the accommodating cavity; an oil pump for pumping lubricating oil, wherein the inlet of the oil pump is connected to the accommodating chamber; a first oil supply passage, connected to the outlet of the oil pump and extending to the motor, for supplying lubricating oil to the motor; as well as, A cooler is provided on the first oil supply channel and is used for cooling the lubricating oil supplied to the motor.

2. The electric drive system according to claim 1, wherein: The motor includes a rotating shaft, and an inner hole is formed in the rotating shaft along the axial direction. The first oil supply channel includes an oil distribution channel, and the oil distribution channel connects the outlet of the cooler and the inner hole.

3. The electric drive system according to claim 2, wherein: The inner hole passes through the rotating shaft along the axial direction of the rotating shaft.

4. The electric drive system according to claim 3, wherein: The diameter of one end of the inner hole connected to the oil distribution channel is smaller than the diameter of the other end of the inner hole.

5. The electric drive system according to any one of claims 2 to 4, characterized in that: The housing comprises a main housing and an end cover covering the main housing. The end cover is provided with an axial hole, and the rotating shaft is rotatably installed in the axial hole.

6. The electric drive system according to claim 5, characterized in that: The housing further comprises a sealing cover mounted on the end cover, the sealing cover covers the shaft hole, an oil cavity is formed between the sealing cover and the end cover, the oil cavity is communicated with the inner hole, and the oil distribution channel is communicated with the oil cavity.

7. The electric drive system according to claim 6, wherein: A connecting pipe is provided in the oil chamber, one end of the connecting pipe is connected to the inner hole, and the other end of the connecting pipe is communicated with the oil distribution channel.

8. The electric drive system according to claim 7, wherein: The connecting pipe and the sealing cover are integrally formed.

9. The electric drive system according to claim 7 or 8, characterized in that: The connecting pipe passes through the sealing cover.

10. The electric drive system according to claims 7-9, characterized in that: The housing further includes a support plate for supporting the connecting pipe, and the support plate is mounted on the cover.

11. The electric drive system according to claim 10, wherein: The connecting pipe and the supporting plate are integrally formed.

12. The electric drive system according to claim 10 or 11, characterized in that: The edge of the support plate is clamped between the sealing cover and the end cover.

13. The electric drive system according to any one of claims 10 to 12, characterized in that: A receiving groove is provided on the surface of the sealing cover facing the end cover, and the supporting plate is placed in the receiving groove.

14. The electric drive system according to claim 13, wherein: From the surface of the cover facing the end cover to the surface away from the end cover, the side wall of the accommodating groove extends in a direction away from the rotating shaft, and the edge of the support plate is adapted to the accommodating groove.

15. The electric drive system according to any one of claims 6 to 14, characterized in that: The oil distribution channel includes a first sub-oil channel opened on the end cover, and the first sub-oil channel is communicated with the oil chamber.

16. The electric drive system according to claim 15, wherein: The sealing cover is provided with a connecting oil passage connecting the first sub-oil passage and the oil chamber.

17. The electric drive system according to claim 15 or 16, wherein: The main housing is provided with a first oil hole and a second sub-oil channel communicating with the first oil hole and the first sub-oil channel; the cooler is communicated with the first oil hole.

18. The electric drive system according to any one of claims 6 to 17, wherein: The oil distribution channel includes a connecting pipe connecting the oil chamber and the cooler.

19. The electric drive system according to any one of claims 6 to 18, wherein: The sealing cover is provided with a ring sleeve, the oil distribution channel is communicated with the ring sleeve, the rotating shaft extends into the ring sleeve, an oil seal ring is provided in the ring sleeve, and the oil seal ring is sleeved on the rotating shaft.

20. The electric drive system according to any one of claims 5 to 19, wherein: An oil seal is installed in the shaft hole, and the oil seal is sleeved on the rotating shaft.

21. The electric drive system according to claim 20, wherein: A first bearing is provided in the shaft hole, the first bearing is sleeved on the rotating shaft, and the oil seal is provided on at least one side of the first bearing.

22. The electric drive system according to any one of claims 2 to 21, characterized in that: A plurality of oil outlet holes are radially opened at the end of the rotating shaft, and each of the oil outlet holes is communicated with the inner hole.

23. The electric drive system according to any one of claims 1 to 22, characterized in that: The motor includes a stator, a second oil hole is opened on the housing at a position corresponding to the stator, and the outlet of the cooler is connected to the second oil hole.

24. The electric drive system according to claim 23, wherein: The cooler is mounted on the casing, and the outlet of the cooler is correspondingly communicated with the second oil hole.

25. The electric drive system according to any one of claims 1 to 24, characterized in that: The electric drive system also includes a transmission and a second oil supply channel. The transmission is connected to the motor and installed in the accommodating cavity. The second oil supply channel is connected to the outlet of the oil pump. The second oil supply channel is used to supply lubricating oil to the transmission.

26. The electric drive system according to claim 25, wherein: The second oil supply channel includes an oil guide pipe, one end of which is connected to the outlet of the oil pump, and the other end of which extends to the transmission.

27. The electric drive system according to any one of claims 25-26, characterized in that: The first oil supply passage is connected to an end of the motor away from the transmission.

28. The electric drive system according to any one of claims 25 to 27, wherein: The accommodating chamber includes a first chamber and a second chamber, the motor is installed in the first chamber, and the transmission is installed in the second chamber.

29. The electric drive system according to claim 28, wherein: The housing further includes a control box, which is located at one side of the first chamber. An accommodating space is formed between the control box and the first chamber, and the oil pump and the cooler are located in the accommodating space.

30. The electric drive system according to any one of claims 1 to 29, wherein: The electric drive system further includes a filter for filtering the lubricating oil flowing out of the oil pump. The filter is connected to the outlet of the oil pump, and the cooler is connected to the filter.

31. A power device, characterized in that: Comprising the electric drive system according to any one of claims 1-30.

32. A vehicle, characterized in that: Comprising the electric drive system according to any one of claims 1-30.

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