WO2023123819A1

WO2023123819A1 - Three-in-one electric drive integrated system

Info

Publication number: WO2023123819A1
Application number: PCT/CN2022/092707
Authority: WO
Inventors: 裴正强; 刘霞; 刘怀金; 司特; 田晓凯
Original assignee: 精进电动科技股份有限公司
Priority date: 2021-12-27
Filing date: 2022-05-13
Publication date: 2023-07-06
Also published as: CN114244023A

Abstract

Disclosed in the present invention is a three-in-one electric drive integrated system for a new-energy vehicle. An oil cooling loop and a water cooling loop are provided among an electric motor, a retarder and a controller. Oil in the retarder is thrown from a low level to a high level under the action of rotation of a gear in the retarder, some of the oil is guided to an electric motor shaft of the electric motor to serve as cooling oil, the electric motor shaft is provided with an oil injection hole, and the cooling oil is sprayed onto a stator winding region and a bearing region under the action of a centrifugal force of rotation of the electric motor shaft so as to achieve the oil cooling for a stator winding of the electric motor and the lubrication for a bearing, while the cooling oil inside the electric motor flows back to the retarder to form an oil cooling circulation. In addition, the circulation water cooling loop is provided among the electric motor, the retarder and the controller, and a heat exchange is created between the water cooling loop and the oil cooling loop at the electric motor and an oil pan of the retarder to cool a housing and the cooling oil by means of cooling water, so as to achieve an oil-water composite cooling effect on the three-in-one electric drive integrated system, thereby increasing the torque capacity and power capacity of the electric motor.

Description

A three-in-one electric drive integrated system

Cross References to Related Applications

This application claims the priority of the Chinese patent application with the application number 202111618967.2 filed on December 27, 2021, and the title of the invention is "a three-in-one electric drive integrated system", the entire contents of which are incorporated herein by reference. Applying.

technical field

The invention belongs to the technical field of motor equipment, and in particular relates to a three-in-one electric drive integrated system that can be used for new energy vehicles.

Background technique

At present, with the rapid development of the new energy vehicle market, the demand for lightweight, integrated and efficient pure electric systems is getting higher and higher. Among them, the cooling treatment of the three-in-one electric drive integrated system composed of motor, reducer and controller is mainly water cooling or oil cooling.

The water-cooling method is mainly to transfer the heat inside the motor to the water channel of the housing through the stator core and the motor housing, and then take away the heat with the help of cooling water flowing through the water channel of the housing. However, since the heat in the stator winding area needs to pass through the insulating layer in the slot, the motor stator can be transferred to the motor housing and taken away by the cooling water. Not only the heat transfer path is long, but also the stator winding cannot be directly cooled, resulting in low cooling efficiency. too ideal.

The oil cooling method uses the non-magnetic and non-conductive properties of the cooling oil itself to directly enter the interior of the motor, so that it is in direct contact with the heat source to quickly remove the heat. However, after a large amount of experimental data, it is known that in the case of using oil cooling, the oil temperature of the entire system will always remain at a relatively high temperature of 80-85°C during the motor’s working process, resulting in a limited overall cooling power and still cooling effect. Not ideal.

In addition, in the case of increasingly high power/torque density requirements, the current conventional three-in-one electric drive integrated system still has the risk of shaft current failure.

Contents of the invention

In view of the above problems, the present invention discloses a three-in-one electric drive integrated system to overcome the above problems or at least partly solve the above problems.

In order to achieve the above object, the present invention adopts the following technical solutions:

A three-in-one electric drive integrated system, including a motor, a reducer and a controller, wherein the motor and the reducer are coaxial and share the same shell, and the three-in-one electric drive integrated system uses two cooling methods to work synchronously, It includes an oil cooling circuit and a water cooling circuit respectively; wherein, the cooling water in the water cooling circuit is powered by an external power source and enters the controller through the water inlet of the controller, and then enters the motor casing of the motor, and After coming out of the motor casing, it flows into the reducer through the external water connection pipe to provide cooling for the lubricating oil of the reducer; the oil cooling circuit circulates inside the three-in-one electric drive integrated system, Rely on the rotation of the reducer gear to agitate the lubricating oil to lubricate the internal parts of the reducer, and a part of the flung lubricating oil is collected, and then enters the motor shaft of the motor through the external oil connection pipe, and relies on the motor The centrifugal force generated by the rotation of the shaft throws the oil out of the oil injection holes on the motor shaft, thereby cooling the winding ends and providing lubrication to the bearings.

Further, the oil cooling circuit includes a first oil cooling circuit section and an oil collecting groove, the first oil cooling circuit section is located inside the motor shaft of the motor and arranged along the axial direction of the motor shaft, the oil collecting groove It is arranged on the casing of the motor, and communicates with the inside of the motor, and is used to collect the oil inside the motor; the oil injection hole is radially arranged on the motor shaft, and the oil injection hole One end communicates with the first oil cooling circuit section, and the other end points to the stator winding area and the bearing area of the motor; the water cooling circuit includes a first water cooling circuit section, and the first water cooling circuit section is located in the motor housing and form heat exchange with the cooling oil inside the oil sump.

Further, the motor casing adopts a stretched casing, and a hollow structure is provided inside the stretched casing, and the hollow structure serves as the first water cooling circuit section.

Further, the oil cooling circuit also includes a second oil cooling circuit section, and the water cooling circuit also includes a second water cooling circuit section; the second oil cooling circuit section is located inside the speed reducer and is used to decelerate the The interior of the reducer is cooled; the second water-cooling circuit section is located in the casing of the reducer, and heat exchange is formed between the second water-cooling circuit section and the second oil-cooling circuit section.

Further, the second oil cooling circuit section communicates with the first oil cooling circuit section to form an internal circulation loop.

Further, a deflector is provided inside the reducer; the deflector is located at the connection position between the second oil cooling circuit and the first oil cooling circuit, and is used to control the flow of the second oil cooling circuit section. A part of the cooling oil is diverted and diverted so that it enters the first oil cooling circuit section.

Further, a movable connection is adopted between the deflector and the housing of the reducer, which is used to adjust the amount of cooling oil entering the first oil cooling circuit section.

Further, the reducer is provided with an oil pan for collecting cooling oil inside the reducer; the second water cooling circuit section is located at the oil pan.

Further, the water cooling circuit includes a third water cooling circuit segment; the controller is connected to the motor, and the third water cooling circuit segment is located in the controller.

Further, the three-in-one electric drive integrated system also includes a conductive brush; the conductive brush is connected to the rear end cover of the motor, and forms a sliding contact with the outer surface of the motor shaft along the diameter direction of the motor shaft .

Advantage of the present invention and beneficial effect are:

In the three-in-one electric drive integrated system of the present invention, by setting an oil cooling circuit and a water cooling circuit between the motor, the reducer and the controller, the oil inside the reducer is reduced from the lower to the lower by the rotation of the internal gear of the reducer. The liquid level is thrown to a higher level, and a part of the oil is drained into the motor shaft of the motor. An oil injection hole is set on the motor shaft, and the cooling oil is sprayed to the stator winding area by using the centrifugal force of the motor shaft rotation, forming a motor stator winding. cooling and lubricating the bearings, while the cooling oil inside the motor flows back to the reducer through the oil sump, thus forming an oil cooling cycle inside the three-in-one electric drive integrated system, that is, the inside of the motor communicates with the inside of the reducer Relational oil cooling cycle. At the same time, a circulating water cooling circuit is set between the motor, reducer and controller, and the heat exchange formed between the water cooling circuit and the oil cooling circuit located in the oil pan of the motor and reducer, forms the cooling water to the shell and the cooling oil. Cooling and cooling, thereby forming the oil-water composite cooling effect of the three-in-one electric drive integrated system, improving the heat dissipation capacity of the motor, increasing the torque capacity and power capacity of the motor, and making the three-in-one electric drive integrated system small in size and easy to integrate Vehicle layout, effectively reducing costs.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiment. The drawings are only for the purpose of illustrating a preferred embodiment and are not to be considered as limiting the invention. Also throughout the drawings, the same reference numerals are used to designate the same components. In the attached picture:

Fig. 1 is a schematic diagram of the appearance structure in the front view direction of the three-in-one electric drive integrated system of this embodiment;

Fig. 2 is a schematic diagram of the appearance structure in the right view direction of the three-in-one electric drive integrated system of this embodiment;

Fig. 3 is a schematic cross-sectional view of the three-in-one electric drive integrated system in Fig. 1;

Fig. 4 is a schematic diagram of the appearance and structure of the motor housing in the three-in-one electric drive integrated system of this embodiment;

Fig. 5 is a schematic diagram of the partial structure inside the reducer in the three-in-one electric drive integrated system of this embodiment;

Fig. 6 is a partial structural schematic diagram of the second water-cooling circuit section in the three-in-one electric drive integrated system of this embodiment;

Fig. 7 is a partial structural schematic diagram of the third water-cooling circuit section in the three-in-one electric drive integrated system of this embodiment;

Fig. 8 is a partial structural diagram of the positional relationship among the motor shaft, the oil circuit connecting pipe and the conductive brush in the three-in-one electric drive integrated system of this embodiment;

Fig. 9 is a schematic diagram of an oil cooling circuit and a water cooling circuit in the three-in-one electric drive integrated system of this embodiment.

specific embodiment

In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in FIG. 1 to FIG. 4 , the three-in-one electric drive integrated system of this embodiment includes a motor 1 , an oil cooling circuit 2 and a water cooling circuit 3 . Wherein, the inside of the oil cooling circuit 2 is provided with flowing cooling oil, and has a first oil cooling circuit section 21 . The first oil cooling circuit segment 21 is located inside the motor shaft 11 of the motor 1 and arranged along the axial direction of the motor shaft 11 , so that cooling oil flows into the inside of the motor shaft 11 . At the same time, an oil injection hole 111 is provided on the motor shaft 11, and one end of the oil injection hole 111 communicates with the first oil cooling circuit section 21, and the other end points to the stator winding area 12 inside the motor 1, so as to transfer the cooling oil from the The stator winding region 12 is introduced into the first oil cooling circuit section 21 . The inside of the water-cooling circuit 3 is provided with flowing cooling water, and heat exchange is formed between the water-cooling circuit 3 and the oil-cooling circuit 2, so as to realize the cooling treatment of the cooling oil by the cooling water.

In this embodiment, the cooling oil is guided into the motor shaft by arranging the first oil cooling circuit section inside the motor shaft of the motor, and an oil injection hole communicating with the first oil cooling circuit section is provided on the motor shaft, thereby During the high-speed rotation of the motor shaft, the cooling oil in the first oil cooling circuit section is sprayed to the stator winding area through the oil injection hole through the centrifugal force, so as to realize the direct oil cooling treatment of the stator winding inside the motor. At the same time, by virtue of the heat exchange formed between the water-cooling circuit and the oil-cooling circuit, the cooling water cools and lowers the temperature of the cooling oil, thereby obtaining a lower oil temperature in the oil-cooling circuit. In this way, while using the motor shaft to accurately drain the cooling oil to the inside of the motor and use the cooling oil to form a direct and precise cooling of the heat source area inside the motor, at the same time, the cooling water with a higher heat exchange rate is used to cool the cooling oil. Therefore, the cooling oil is quickly cooled, and the cooling effect of the cooling oil on the inside of the motor is improved, and finally a better cooling effect for the three-in-one electric drive integrated system is obtained.

As shown in FIG. 3 , a plurality of oil injection holes 111 are provided on the motor shaft 11 of this embodiment, including the oil injection holes 111 pointing to the stator winding area 12 and also including the oil injection holes 111 pointing to the bearing. In this way, not only can the precise oil cooling treatment be carried out on the stator winding area, but also the bearing can be cooled and lubricated to improve the oil cooling effect on the entire motor interior, in addition, it can also have a good lubricating effect on the bearing, which can reduce bearing failure risk and improve the work efficiency of the three-in-one electric drive integrated system.

Of course, in other embodiments, according to the difference in the internal structure of the motor and the need for oil cooling in different areas inside the motor, the position and quantity of the oil injection holes set on the motor shaft can be adjusted, so that Through the matching structure of the first oil cooling circuit section and the oil injection hole, the precise oil cooling and lubrication treatment of different areas inside the motor can be realized.

As shown in FIG. 4 , in this embodiment, the water-cooling circuit 3 includes a first water-cooling circuit section 31, and the first water-cooling circuit section 31 is located on the motor housing 13, and the oil-cooling circuit 2 also includes an oil sump 22, which collects The oil groove 22 is also arranged on the motor housing 13, and communicates with the inside of the motor 1 through the oil guide hole provided on the motor end cover, and is used to collect the cooling oil inside the motor, so as to prevent the cooling oil inside the motor from being too high. Many and flood the air gap. The first water-cooling circuit section 31 flows through the position where the oil collecting tank 22 is located to form heat exchange with the cooling oil inside the oil collecting tank 22 .

At this time, through the heat exchange treatment formed by the first water cooling circuit section in the water cooling circuit and the cooling oil collected in the oil collection tank, the cooling and cooling treatment of the cooling oil inside the motor after the oil cooling treatment is achieved, and the water cooling treatment of the cooling oil is realized. At the same time, by arranging the first water-cooling circuit section on the motor housing, the water-cooling circuit can also be used to achieve water-cooling treatment on the motor housing, thereby improving the water-cooling utilization rate and improving the cooling effect on the motor.

Preferably, in this embodiment, the motor casing 13 is a stretched casing, and a hollow structure is provided inside the stretched casing, so that the hollow structure inside the motor casing 13 is used as the first water cooling circuit section 31, That is to say, the interlayer of the motor casing is used as the first water cooling circuit section. In this way, not only can the weight of the entire motor casing be reduced, and the lightweight design of the motor can be realized, but also the first water-cooling circuit section is placed inside the motor casing to achieve an integrated design of the motor casing and the first water-cooling circuit section , Improve the integration of the three-in-one electric drive integrated system.

Among them, in this embodiment, by setting a plurality of axial hollow passages distributed along its circumferential direction on the motor housing, and then by connecting the two ends of the adjacent hollow passages to the multiple hollow passages and blocking them , so as to form the first water-cooling circuit segment that continuously reciprocates along the axial direction of the motor housing as shown in FIG. 4 . At the same time, a motor water inlet 131 and a motor water outlet 132 are provided on the motor housing, so as to realize the circulating flow of cooling water flowing through the motor housing. Of course, in other embodiments, depending on the structure of the motor, other ways can also be used to design the first water-cooling circuit section, such as coiled tubes wound outside the motor housing, or even independent heat exchangers The structural form is fixed on the motor housing through a detachable connection, so as to achieve cooling treatment for the oil cooling circuit.

As shown in FIG. 1 , the three-in-one electric drive integrated system of this embodiment also includes a reducer 4 , and the reducer 4 and the motor 1 are connected by a coaxial common casing. In this way, not only can the integrated design of the motor and the reducer be realized, but also the coaxial precision of the connection between the motor and the reducer can be improved, the structural rigidity of the motor and reducer assembly can be improved, and vibration noise can be reduced.

As shown in FIG. 5 and FIG. 6 , in this embodiment, the oil cooling circuit 2 further includes a second oil cooling circuit segment 23 , and the water cooling circuit 3 further includes a second water cooling circuit segment 32 . Wherein, the second oil cooling circuit section 23 is located inside the reducer 4 and is used for cooling the inside of the reducer 4 . The second water-cooling circuit section 32 is located in the housing of the speed reducer 4, and heat exchange is formed between the second water-cooling circuit section 32 and the second oil-cooling circuit section 23, so that the cooling water in the second water-cooling circuit section forms a pair of cooling water for the second oil. Cooling treatment of cooling oil in the cold circuit section.

At this time, while the oil cooling circuit performs oil cooling treatment on the motor through the first oil cooling circuit section, it forms cooling treatment on the reducer through the second oil cooling circuit section, and the second water cooling circuit section in the water cooling circuit cools the first oil cooling circuit section. The second oil cooling circuit section is water-cooled, thereby greatly reducing the temperature of the cooling oil in the second oil cooling circuit section, and improving the cooling effect on the reducer.

As shown in FIG. 5 and FIG. 6 , the reducer 4 of this embodiment is provided with an oil pan 41 . The oil pan 41 is used to collect the cooling oil inside the speed reducer 4 as a part of the second oil cooling circuit section 23 , and a part of the second water cooling circuit section 32 is located at the oil pan 41 .

At this time, through the cooling treatment of the cooling oil inside the oil pan by the second water-cooling circuit section, cooling and cooling of the cooling oil in the second oil-cooling circuit section is achieved. Among them, the second water-cooling circuit section adopts the design directly arranged inside the reducer housing, such as direct casting or adopts the structural design of slotting and sealing, so that not only can the cooling water in the second water-cooling circuit section be reduced The heat exchange distance of the cooling oil in the oil sump improves the heat exchange efficiency, and can also reduce the space occupied by the second water cooling circuit section, and improve the integration of the entire three-in-one electric drive integrated system.

Of course, in other embodiments, other methods can also be used to cool the second oil cooling circuit section by the second water cooling circuit section, for example, the cooling oil in the second oil cooling circuit section is led out to the reducer by means of external pipelines. Externally, the second water-cooling circuit section in the form of a heat exchanger or coil performs heat exchange treatment on the second oil-cooling circuit section.

Preferably, as shown in FIG. 1 and FIG. 5 , an oil connection pipe 24 is provided between the motor 1 and the reducer 4 in this embodiment. One end of the oil connection pipe 24 extends to the motor shaft 11 of the motor 1 and is connected to the end cover of the first oil cooling circuit section 21, and the other end is located at the housing of the reducer 4 to form a connection with the second oil cooling circuit The road section 23 communicates, thereby connecting the second oil cooling circuit section 23 with the first oil cooling circuit section 21 .

At this time, the cooling oil with lubricating function is selected to be injected into the reducer, and during the normal operation of the reducer, part of its internal gears will be soaked in the cooling oil inside the oil pan. In this way, when the reducer is rotating, the internal gears can take the cooling oil inside the oil pan and throw it to different positions inside the reducer, so as to lubricate the internal parts of the reducer. In this case, The inner cavity of the entire reducer can be regarded as the second oil cooling circuit section, in which part of the cooling oil will enter the oil circuit connecting pipe under the swing of the gear, and then enter the first oil cooling circuit section through the oil circuit connecting pipe, that is, Enter the motor shaft of the motor, and then realize the direct oil cooling and lubrication treatment of the inside of the motor.

The second oil cooling circuit section is connected with the first oil cooling circuit section by setting the oil circuit connecting pipe, so that the motor oil cooling system and the reducer oil cooling system are integrated into one, forming a three-in-one electric drive integrated system internal oil cooling cycle. In this way, not only can the integration of the entire three-in-one electric drive integrated system be further improved, especially the integration of the cooling structure of the three-in-one electric drive integrated system, but also can be formed by means of the first water-cooling circuit section and the second water-cooling circuit section. The water cooling treatment of different areas of the entire oil cooling circuit improves the cooling effect of the cooling oil, thereby improving the cooling effect of the entire 3-in-1 electric drive integrated system.

Further, as shown in FIG. 1 and FIG. 5 , a water connection pipe 33 is provided between the motor 1 and the reducer 4 in this embodiment. One end of the water connection pipe 33 extends to the motor water outlet 132 to form communication with the first water cooling circuit section 31, and the other end is located at the housing of the reducer 4 to form communication with the second water cooling circuit section 32, thereby cooling the first water back to The road section 31 communicates with the second water cooling circuit section 32 .

At this time, the water cooling system of the motor and the water cooling system of the reducer are integrated into one by setting a water connection pipe to connect the first water cooling circuit section and the second water cooling circuit section. In this way, not only the integration degree of the whole three-in-one electric drive integrated system, especially the integration degree of the cooling structure of the three-in-one electric drive integrated system can be further improved, but also the utilization rate of cooling water can be improved.

In addition, in this embodiment, for the motor and the reducer that adopt the coaxial common shell design, the oil sump of the motor casing and the reducer oil pan are further designed to be connected, so that the second oil cooling circuit section and the reducer are connected again. The first oil cooling circuit section is connected, so that the second oil cooling circuit section and the first oil cooling circuit section form a circulation loop, that is, the oil cooling circuit forms a circulation loop, which further improves the integration of the oil cooling system in the three-in-one electric drive integrated system .

Of course, in other embodiments, depending on the design and operating conditions, an oil hole communicating with the outside world can also be opened at the corresponding position of the oil collection tank to lead and introduce the cooling oil in the oil collection tank, so as to achieve the cooling of the cooling oil. operations such as supplementation, replacement, and detection.

In addition, as shown in FIG. 3 , in this embodiment, based on the coaxial common shell design of the motor 1 and the reducer 4 , the oil cooling circuit 2 further includes a third oil cooling circuit segment 25 . The third oil cooling circuit section 25 is located at the front end of the motor shaft 11, and one end communicates with the second oil cooling circuit section 23, that is, communicates with the inner cavity of the reducer 4, and the other end passes through the oil injection hole provided on the motor shaft 11 111 communicates with the front end bearing area of the motor 1 .

In this way, through the third oil cooling circuit section set at the front end of the motor shaft, not only can the cooling oil be drained to the front end bearing of the motor to achieve cooling and lubrication for the front end bearing, but also the drainage distance for the cooling oil can be shortened, improving the efficiency of the front end bearing. Bearing cooling and lubrication efficiency. Of course, in other embodiments, according to the size of the motor shaft in the motor, especially the length dimension, the length dimension relationship between the first oil cooling circuit section and the third oil cooling circuit section set inside it can be adjusted, so as to achieve The effect of direct oil cooling inside the motor.

As shown in FIG. 5 , a deflector 42 is provided inside the speed reducer 4 of this embodiment. The deflector 42 is located in the upper area of the reducer 4 where the cooling oil is thrown out of the gear, and is used for draining and shunting the cooling oil thrown out by the gear, so that part of the cooling oil can enter the oil circuit connecting pipe 24, thereby entering the The first oil cooling circuit section 21 . At this time, the deflector is used to form a diversion operation for the cooling oil inside the reducer, so as to realize the purpose of diverting part of the cooling oil to the inside of the motor, and achieve the cooling oil between the first oil cooling circuit section and the second oil cooling circuit section. diversion effect.

Further, a flexible connection may also be adopted between the deflector and the housing of the reducer, for example, the rotational connection between the deflector and the housing of the reducer is performed through a rotating shaft. In this way, the deflector can be controlled to swing back and forth inside the housing of the reducer by adjusting the rotating shaft, thereby adjusting the flow of cooling oil formed by the cooperation between the deflector and the housing of the reducer to the first oil cooling circuit section and the second oil cooling circuit section. The proportional relationship of channel cross-sectional dimensions for separate drainage and diversion in the oil cooling circuit section, and then adjust the proportional relationship of cooling oil volume for oil cooling treatment of the motor and reducer, balance the oil cooling treatment of the motor and reducer, and finally achieve the whole three-in-one Improvement of the oil cooling treatment effect of the electric drive integrated system.

As shown in FIG. 1 and FIG. 7 , the three-in-one electric drive integrated system of this embodiment is further provided with a controller 5 , and the controller 5 is installed and fixed on the motor housing 13 . At the same time, the water cooling circuit 3 also includes a third water cooling circuit section 34 , and the third water cooling circuit section 34 is located in the controller 5 for water cooling the controller 5 .

At this time, by setting the controller on the motor, a three-in-one drive system design consisting of the motor, reducer and controller is formed to meet the needs of the new energy vehicle market for lightweight, integrated and efficient pure electric systems , Improve the integrated design of the entire three-in-one electric drive integrated system, reduce the volume, facilitate the layout of the vehicle, and reduce the weight and cost of the vehicle.

Further, as shown in FIG. 1, FIG. 4 and 6, a controller water inlet 51 is provided on the controller 5 for introducing cooling water into the third water-cooling circuit section 34, that is, one end of the third water-cooling circuit section 34 and the control The water inlet 51 of the motor is connected, and the other end of the third water cooling circuit section 34 is connected to the water inlet 131 of the motor through the connecting pipe 52 after spiraling and bending inside the controller 5, so that the third water cooling circuit section 34 and the first water cooling circuit section 34 are connected to each other. The road section 31 forms a connection, and at the same time, the communication of the first water cooling circuit section 31 and the second water cooling circuit section 32 through the waterway connecting pipe 33 realizes the communication of the entire water cooling circuit 3, that is, the third water cooling circuit section 34, the first water cooling circuit section 34 and the second water cooling circuit section 32. The water-cooling circuit section 31 and the second water-cooling circuit section 32 are connected in series accordingly, and the reducer 4 is provided with a reducer water outlet 43, and the reducer water outlet 43 communicates with the second water-cooling circuit section 32 for The cooling water in the water cooling circuit 3 is drawn out.

In this way, not only can the piping design of the entire water-cooling circuit be optimized, and the integration of the water-cooling system in the entire three-in-one electric drive integrated system can be improved, but also the utilization rate of the cooling water of the entire water-cooling system can be improved, thereby improving the utilization rate of the entire three-in-one electric drive integrated system. Cooling effect of electric drive integrated system.

As shown in FIG. 8 , a conductive brush 14 is also provided in the motor 1 of this embodiment. The conductive brush 14 is connected to the rear end cover of the motor 1 and forms a sliding contact with the outer surface of the protruding end of the motor shaft 11 along the diameter direction of the motor shaft 11 . In this way, by setting the conductive brush, the shaft current can be reduced, the electrical corrosion of the bearing can be reduced, and the service life and working stability of the entire three-in-one electric drive integrated system can be improved.

In addition, as shown in FIG. 2 , a grounding point 133 and a hoisting hole 134 are provided on the motor casing 13 of this embodiment, which are respectively used for grounding connection and hoisting operation of the motor. In other embodiments, depending on the design and operating conditions, venting plugs and oil draining plugs can also be provided at different positions for exhausting and preventing insulation failure and oil replacement caused by internal gas condensation.

As shown in FIG. 9 , in this embodiment, the cooling water is output from the water tank to the controller housing, and then flows through the motor housing and the reducer housing in turn and then returns to the water tank, thereby forming a circulating water cooling circuit. The cooling oil in the reducer oil tank is thrown from low liquid level to high liquid level by the rotation of the reducer gear itself, part of the cooling oil is drained into the motor shaft, and the cooling oil located in the motor shaft is in the motor shaft. During the rotation process, the oil is sprayed to the motor stator through the oil injection hole to form a direct oil cooling of the motor stator, and the cooling oil inside the motor housing is returned to the reducer oil tank, thus forming a circulating oil cooling circuit. At the same time, the cooling of the reducer oil tank is formed at the reducer housing and the cooling of the motor stator is formed at the motor housing, thereby forming the oil-water composite cooling of the three-in-one electric drive integrated system.

The above descriptions are only specific implementations of the present invention. Under the above teaching of the present invention, those skilled in the art can make other improvements or modifications on the basis of the above embodiments. Those skilled in the art should understand that the above specific description is only to better explain the object of the present invention, and the protection scope of the present invention should be determined by the protection scope of the claims.

Claims

A three-in-one electric drive integrated system is characterized in that it includes a motor, a reducer and a controller, wherein the motor and the reducer are connected by a coaxial common shell, and the three-in-one electric drive integrated system uses two The two cooling methods work synchronously, including an oil cooling circuit and a water cooling circuit respectively; wherein, the cooling water in the water cooling circuit is powered by an external power source and enters the controller from the water inlet of the controller, and then enters the motor. Motor housing, and after coming out of the motor housing, it flows into the reducer through an external water connection pipe to provide cooling for the lubricating oil of the reducer; the oil cooling circuit is in the three-in-one electric drive The internal circulation of the integrated system relies on the rotation of the reducer gear to stir the lubricating oil to lubricate the internal parts of the reducer, and a part of the flung lubricating oil is collected, and then enters the motor of the motor through the external oil connection pipe The shaft relies on the centrifugal force generated when the motor shaft rotates to throw the oil from the oil spray hole on the motor shaft, thereby cooling the stator windings and providing lubrication to the bearings.
The three-in-one electric drive integrated system according to claim 1, wherein the oil cooling circuit includes a first oil cooling circuit section and an oil sump, and the first oil cooling circuit section is located on the motor shaft of the motor inside and arranged along the axial direction of the motor shaft, the oil collecting groove is arranged on the casing of the motor and communicated with the inside of the motor for collecting the oil inside the motor; the oil injection Holes are provided along the radial direction of the motor shaft, one end of the oil injection hole communicates with the first oil cooling circuit section, and the other end points to the stator winding area and bearing area of the motor; the water cooling circuit includes the first A water-cooling circuit section, the first water-cooling circuit section is located on the motor housing and forms heat exchange with the cooling oil inside the oil collection tank.
The three-in-one electric drive integrated system according to claim 2, wherein the motor housing adopts a stretched shell, and a hollow structure is provided inside the stretched shell, and the hollow structure serves as the Describe the first water cooling circuit section.
The three-in-one electric drive integrated system according to claim 2, wherein the oil cooling circuit further includes a second oil cooling circuit segment, and the water cooling circuit further includes a second water cooling circuit segment; the second oil cooling circuit The cooling circuit section is located inside the reducer, and is used to cool the inside of the reducer; the second water cooling circuit section is located in the housing of the reducer, and the second water cooling circuit section is connected to the Heat exchange is formed between the second oil cooling circuit sections.
The three-in-one electric drive integrated system according to claim 4, wherein the second oil cooling circuit section communicates with the first oil cooling circuit section to form an inner circulation circuit.
The three-in-one electric drive integrated system according to claim 5, wherein a deflector is provided inside the reducer; the deflector is located between the second oil cooling circuit section and the first The connection position of the oil cooling circuit section is used to divert and divert a part of the cooling oil of the second oil cooling circuit section so that it enters the first oil cooling circuit section.
The three-in-one electric drive integrated system according to claim 6, characterized in that, the deflector is connected to the housing of the reducer with a movable connection, which is used to prevent the oil from entering the first oil cooling circuit section. Adjust the amount of cooling oil.
The three-in-one electric drive integrated system according to claim 4, wherein the reducer is provided with an oil pan for collecting cooling oil inside the reducer; the second water-cooling circuit section flows through The oil pan forms heat exchange with the cooling oil inside the oil pan.
The three-in-one electric drive integrated system according to any one of claims 1-8, wherein the water-cooling circuit includes a third water-cooling circuit section; the controller is connected to the motor, and the first Three water cooling loop segments are located on the controller.
According to the three-in-one electric drive integrated system according to any one of claims 1-8, it is characterized in that the three-in-one electric drive integrated system also includes a conductive brush; the conductive brush and the rear end cover of the motor connected and in sliding contact with the outer surface of the motor shaft along the diameter of the motor shaft.