CN117097060A

CN117097060A - Integrated oil-cooled bridge

Info

Publication number: CN117097060A
Application number: CN202310895157.4A
Authority: CN
Inventors: 杨宇; 徐清清; 张冠楠; 张毅
Original assignee: United Automotive Electronic Systems Co Ltd
Current assignee: United Automotive Electronic Systems Co Ltd
Priority date: 2023-07-19
Filing date: 2023-07-19
Publication date: 2023-11-21

Abstract

The invention belongs to the technical field of new energy automobile power devices, and particularly relates to an integrated oil-cooled bridge, which comprises the following components: the integrated shell, and motor, controller and speed reducer installed on the integrated shell, and the motor is matched with the speed reducer in a transmission way, and the motor is electrically connected with the controller; the integrated shell is provided with an oil cooling channel, the oil cooling channel comprises a first main channel and a second main channel, corresponding oil ways are arranged on the motor and the speed reducer and are respectively connected with the first main channel and the second main channel, so that cooling oil cools a rotor and a stator of the motor along the oil ways and lubricates bearings on the speed reducer. The invention fully utilizes the advantage of oil cooling, optimizes the cooling design on the basis of the traditional stator-rotor oil cooling design, cools the motor, the speed reducer and the differential mechanism, and lubricates all bearings on the motor, the speed reducer and the differential mechanism so as to improve the output performance of the bridge, prolong the service life of the bridge and have higher reliability and practicability.

Description

Integrated oil-cooled bridge

Technical Field

The invention belongs to the technical field of power devices of new energy automobiles, and particularly relates to an integrated oil-cooled bridge.

Background

An electric bridge (also known as an electric drive system) is the power system of an electric vehicle for driving the vehicle. The bridge is generally composed of three parts, namely a motor, a speed reducer and a motor controller. During driving, the motor controller inverts direct current provided by the battery into three-phase alternating current to be supplied to the motor, the motor converts the three-phase electric energy into mechanical energy of a motor rotor through electromagnetic action, and the speed reducer converts the mechanical energy of the motor rotor into rotating speed and torque required by a vehicle to drive the vehicle through a proper speed ratio. At present, more mainstream bridges are designed by independently separating three parts, and the three parts are assembled into an assembly through bolt machinery after being assembled respectively or partially. This conventional solution, in turn, results in a heavy and bulky bridge assembly. Meanwhile, the bridge mainly adopts a cooling mode of a water-cooled motor, the cooling efficiency is low, and the motor performance is not superior.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present invention aims to provide an integrated oil-cooled bridge, which is designed with three-in-one high integration, optimizes the oil-cooled flow passage inside the bridge, and can lubricate the corresponding bearing system while cooling the motor, the speed reducer and the differential mechanism, so as to improve the output performance of the bridge.

To achieve the above and other related objects, the present invention provides an integrated oil-cooled bridge comprising: the integrated shell, and motor, controller and speed reducer installed on the integrated shell, and the motor is in transmission fit with the speed reducer, and the motor is electrically connected with the controller; the integrated shell is provided with an oil cooling channel, the oil cooling channel comprises a first main channel and a second main channel, and the motor and the speed reducer are provided with corresponding oil ways which are respectively connected with the first main channel and the second main channel, so that cooling oil cools a rotor and a stator of the motor along the oil ways and lubricates bearings on the speed reducer.

According to a specific embodiment of the invention, the motor comprises: a stator fixed within the integrated housing, and the stator comprising: the stator iron core is adhered and fixed with the inner wall of the integrated shell, and the two ends of the stator iron core are respectively provided with a first oil injection ring and a second oil injection ring; the stator core is circumferentially provided with a first through hole for communicating the first oil injection ring and the second oil injection ring; the stator winding is fixed on the stator core, and two ends of the stator winding are respectively arranged corresponding to the first oil injection ring and the second oil injection ring; and the rotor is in rotating fit with the stator.

According to an embodiment of the present invention, the first main flow channel is formed on an outer wall of the integrated housing and is disposed corresponding to the stator core; a first oil outlet is arranged on the first main runner and communicated with the second oil spraying ring; the cooling oil flows into the second oil injection ring from the first oil outlet along the first main flow channel.

According to a specific embodiment of the invention, the first oil injection ring and the second oil injection ring adopt all or part of sealing-free structures; the first oil spraying ring, the second oil spraying ring and the first through hole are in quasi-sealing fit.

According to an embodiment of the invention, the rotor comprises: the first end of the rotating shaft is matched with a first rotating bearing, the second end of the rotating shaft is matched with a second rotating bearing, and the shaft body is matched with a third rotating bearing; a first oil pipeline is formed in the rotating shaft along the first end; the rotor iron core is coaxially and fixedly connected with the rotating shaft; the rotating discs are fixed at two ends of the rotor core; the iron core is circumferentially provided with a second through hole, a first connecting hole is formed between the rotating shaft and the rotating disc, and penetrates through one attached side of the rotating shaft and the rotating disc to be communicated with the first oil pipeline and the second through hole.

According to a specific embodiment of the present invention, a second connecting hole is provided on the rotating shaft at a position corresponding to the third bearing, and penetrates through one side of the first oil passage, so that cooling oil can flow out to the third bearing along the second connecting hole.

According to an embodiment of the invention, the first main flow channel further extends in a direction towards the second end of the rotation shaft.

According to a specific embodiment of the present invention, a second oil outlet is further provided on the first main runner, and the second oil outlet is located above the second rotating bearing; and a plug is arranged at the outlet of the second oil outlet, and the cooling oil flows out of the second oil outlet along the first main runner and drops onto the second rotating bearing.

According to a specific embodiment of the present invention, a third oil outlet is further provided on the first main runner; and the cooling oil flows out of the third oil outlet along the first main runner and is sprayed onto a high-voltage wire electrically connected with the motor and the controller.

According to a specific embodiment of the present invention, the decelerator includes: the driving gear is coaxially and rotatably arranged with the rotating shaft; the driven gear is in transmission fit with the driving gear; the first end of the intermediate shaft is matched with a first intermediate bearing, and the second end of the intermediate shaft is matched with a second intermediate bearing; the intermediate shaft and the driven wheel are coaxially and rotatably arranged; the speed reducer comprises a speed reducer shell, a first oil duct, a second oil duct and a third oil duct; the outlet of the first oil duct is communicated with the first oil duct, and the outlet of the second oil duct is arranged corresponding to the matching position of the driving gear and the driven gear; and a second oil channel is formed in the middle shaft along the direction from the first end to the second end, and the outlet of the third oil channel is communicated with the second oil channel.

According to a specific embodiment of the present invention, the second main flow channel is provided with a first outlet, a second outlet, and a third outlet, and is correspondingly connected to the inlet of the first oil channel, the inlet of the second oil channel, and the inlet of the third oil channel.

According to a specific embodiment of the present invention, a first gap is formed between the outlet of the first oil duct and the first oil duct, and the position of the first gap corresponds to the first rotation bearing; wherein the cooling oil flows out from the first gap to the first rolling bearing along the first oil passage.

According to a specific embodiment of the present invention, a second gap is formed between the outlet of the third oil duct and the second oil duct, and the position of the second gap corresponds to the first intermediate bearing; wherein the cooling oil flows out from the second gap to the first intermediate bearing along the third oil passage.

According to a specific embodiment of the present invention, further comprising: the differential mechanism is in transmission fit with the intermediate shaft; the differential comprises a gear assembly, an output shaft and a differential shell, wherein the gear assembly is respectively in transmission fit with the intermediate shaft and the output shaft, and the output shaft is used for being connected with an external device.

According to a specific embodiment of the invention, a first end of the output shaft is matched with a first differential bearing; the third oil duct is formed with a sub-oil duct at the first end of the intermediate shaft along the cross section direction of the intermediate shaft, and a first oil hole is formed in the differential housing, is correspondingly arranged with the first differential bearing and is communicated with the sub-oil duct, so that cooling oil drops onto the first differential bearing along the first oil hole.

According to a specific embodiment of the invention, the second end of the output shaft is matched with a second differential bearing; the integrated shell is internally provided with a second oil hole which is respectively arranged corresponding to the first oil injection ring and the second differential bearing, so that the cooling oil flows from the second oil hole to the second differential bearing along the first oil injection ring.

According to a specific embodiment of the invention, an oil pool is arranged at the bottom of the integrated shell and is used for collecting the cooling oil; the bottom of the integrated shell is inclined along the direction in which two ends of the motor converge towards the center and the direction in which the motor approaches the speed reducer, so that the oil pool is formed.

According to a specific embodiment of the present invention, an oil return hole or an oil return channel is correspondingly provided on a path of the bottom of the integrated housing along a direction from two ends of the motor to the center, and/or on a path of the motor toward the direction of the speed reducer, so that cooling oil can flow into the oil pool.

According to one embodiment of the invention, the cooling oil cooling device further comprises a heat exchanger and an oil pump, wherein the oil pump pumps oil from the oil pool and inputs the oil into the heat exchanger to cool down to form the cooling oil.

According to one embodiment of the invention, the bottom of the integrated shell is provided with an oil suction port at the center of two ends of the motor, and an oil suction duct is prolonged and arranged in connection with the oil suction port; the other end of the oil suction channel is connected with the oil pump.

According to a specific embodiment of the invention, the integrated shell is further provided with a water cooling channel; and cooling water flows through the controller, the second rotating bearing and the heat exchanger along the water cooling channel and flows out of the heat exchanger.

According to one embodiment of the invention, the controller comprises a cooling plate, and a water inlet and a water outlet are formed in the cooling plate; the integrated shell is provided with a water inlet hole and a water outlet hole which correspond to the water inlet and the water outlet respectively; wherein, the cooling water flows into the cold plate from the water inlet hole and flows out from the water outlet hole.

According to a specific embodiment of the present invention, a cover shell is further disposed on a side of the integrated housing, which is close to the second rotating bearing, and a first channel is disposed on the cover shell and is matched with the water outlet hole, so that cooling water flows into the first channel; and the first passage is provided outside the second rolling bearing.

According to an embodiment of the invention, the first channel is arranged circumferentially around the second rotational bearing.

According to a specific embodiment of the present invention, a second channel is further provided on the integrated housing, and the second channel is connected to the first channel and the heat exchanger, and is located outside the stator punching key of the motor.

The invention provides an integrated oil-cooled bridge, which fully utilizes the advantages of oil cooling, optimizes the cooling design on the basis of the traditional stator-rotor oil cooling design, cools a motor, a speed reducer and a differential mechanism, prolongs the service life of the bridge and has high reliability; and lubricate all bearings on motor, reduction gear and differential mechanism, promote the output performance of electric bridge correspondingly, and the lubricating oil mass realizes initiative adjustable through the oil pump to with assembly rotational speed decoupling, strong adaptability. Meanwhile, a water cooling channel is correspondingly added, so that the cooling design is optimized, the controller, namely the stator punching key, is cooled, oil circulation in the bridge is facilitated through the heat exchanger, and the oil cooling efficiency is improved. The integrated oil-cooled bridge three-in-one highly integrated design adopts the integrated shell, so that the number of matching surfaces and the number of connecting pieces can be reduced, and the size and the weight of the assembly are reduced. The oil cooling flow channel and the water cooling channel are integrated inside the shell, an external pipeline is not required to be integrated, the outer boundary is neat and compact, the reliability is good, and the practicability is high.

Drawings

FIG. 1 is a perspective view of an integrated oil-cooled bridge according to an embodiment of the present invention;

FIG. 2 is a perspective view of an embodiment of an integrated housing according to the present invention;

FIG. 3 is a schematic diagram illustrating a distribution of an embodiment of an oil cooling channel according to the present invention;

FIG. 4 is a schematic view of a portion of another embodiment of a cold runner provided by the present invention;

FIG. 5 is a partial cross-sectional view of an embodiment of a motor provided by the present invention;

FIG. 6 is a partial cross-sectional view of another embodiment of an electrode provided by the present invention;

FIG. 7 is a partial cross-sectional view of an embodiment of a speed reducer provided by the present invention;

FIG. 8 is a partial cross-sectional view of one embodiment of a reduction and differential provided by the present invention;

FIG. 9 is a perspective view of another embodiment of an integrated housing provided by the present invention;

FIG. 10 is a schematic diagram illustrating a water cooling channel according to an embodiment of the present invention;

FIG. 11 is a schematic diagram illustrating a water cooling channel according to another embodiment of the present invention.

Detailed Description

Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.

It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the illustrations, not according to the number, shape and size of the components in actual implementation, and the form, number and proportion of each component in actual implementation may be arbitrarily changed, and the layout of the components may be more complex.

Referring to fig. 1-11, an integrated oil-cooled bridge, comprising: the motor 10, the controller 20, the speed reducer 30 and the integrated housing 40 have corresponding mounting positions formed on the integrated housing 40 to mount the motor 10, the controller 20 and the speed reducer 30. Wherein, as shown in fig. 2, the integrated housing 40 is hollow, and the motor 10 and the decelerator 30 are respectively embedded into the integrated housing 40 from both sides of the integrated housing 40 and form a driving fit. The top of the integrated housing 40 is also formed with a recess for installing the controller 20, and the controller 20 is electrically connected with the motor 10 to control the start-stop and rotation speed of the motor 10 according to the control signal. The bridge in the embodiment is arranged in an integrated way, so that the integral structure is greatly simplified, the system parts are reduced, and the volume and the weight of the bridge are reduced.

Further, an oil cooling channel 41 is provided inside the integrated housing 40, and extends along the positions of the stator 11 and the rotor 12 of the motor 10, and oil channels matched with the oil cooling channel 41 are formed on the stator 11 and the rotor 12 so that cooling oil can cool the motor 10. Meanwhile, the cooling oil can lubricate the bearing on the rotor 12 along the oil path, so that the rotation performance of the motor 10 is improved. Specifically, as shown in fig. 3, the oil cooling flow path 41 includes a first main flow path 411 and a second main flow path 412, which are respectively provided corresponding to the oil paths on the stator 11 and the rotor 12, and the cooling oil can act on the stator 11 and the rotor 12 from different flow paths. In this embodiment, the cold oil channel 41 is integrated on and in the housing of the bridge, so that more pipelines are not arranged, and the whole structure of the bridge is complex, and the cooling paths are staggered and messy.

In a specific embodiment, as shown in fig. 6, the stator 11 of the electric machine 10 is fixed in the integrated housing 40, and the stator 11 includes a stator core 111 and a stator winding 112. The stator core 111 is fixed to the integrated housing 40 and is bonded to the inner wall of the integrated housing 40. The two ends of the stator core 111 are also provided with a first oil injection ring 113 and a second oil injection ring 114 respectively, and a first through hole 1111 is formed in the circumferential direction of the stator core 111 to communicate the first oil injection ring 113 and the second oil injection ring 114 to form an oil path. The stator winding 112 is fixed on the stator core 111, and two ends of the stator winding are respectively corresponding to the first oil spraying ring 113 and the second oil spraying ring 114.

Specifically, the first main flow passage 411 is formed on the outer wall of the integrated housing 40, and is disposed at a distribution position corresponding to the stator core 111, preferably parallel to the stator core 111. In addition, a first oil outlet 4111 is formed on the first main flow channel 411 and penetrates the integrated housing 40 to communicate the first main flow channel 411 with the second oil injection ring 114. The cooling oil can flow into the second oil spray ring 114 from the first oil outlet hole 4111 along the first main flow passage 411. And the second spray ring 114 can spray cooling oil onto the ends of the stator windings 112 under the action of oil pressure. Meanwhile, the cooling oil can also flow into the first oil spraying ring 113 along the first through hole 1111 on the stator core 111, and is sprayed onto the other end of the stator winding 112 through the first oil spraying ring 113, thereby completing cooling of the stator winding 112.

The spray hole angles on the first spray ring 113 and the second spray ring 114 can be adjusted to uniformly spray cooling oil on the stator winding 112, thereby improving the cooling effect. The first oil spraying ring 113 and the second oil spraying ring 114 can adopt a completely sealing-free structure or a partially sealing-free structure, and a quasi-sealing fit is formed between the first oil spraying ring 113 and the second oil spraying ring 114 and the first through hole 1111 on the stator core 111, so that cooling oil is better conveyed. Meanwhile, when the cooling oil flows through the first through holes 1111, the stator core 111 is correspondingly cooled, and since the first through holes 1111 are circumferentially provided so that the cooling oil can be sufficiently contacted with the stator core 111, the cooling effect is greatly improved.

Further, the rotor 12 is in a rotary fit with the stator 11, when the controller 20 outputs current, the rotor 12 is driven to start rotating under the action of the magnetic field, and outputs power, and the rotor 12 includes a rotary shaft 121, a rotor core 122 and a rotary disk 123. The first end of the rotating shaft 121 is matched with a first rotating bearing 1211, the second end is matched with a second rotating bearing 1212, the shaft body is matched with a third rotating bearing 1213, a first oil channel 1214 is formed in the rotating shaft 121, and the first oil channel 1214 extends along the direction from the first end to the second end of the rotating shaft 121.

The rotor core 122 is fixed coaxially with the rotation shaft 121, and second through holes 1221 are provided in the circumferential direction of the rotor core 122, and the rotor disks 123 are fixed to both ends of the rotor core 122. Meanwhile, in order to cool the rotor core 122, a first connection hole 1215 is provided between the rotation shaft 121 and the rotation disc 123, penetrating through a side where the rotation shaft 121 and the rotation disc 123 are attached to communicate the first oil passage 1214 and the second passage 1221, so that cooling oil can flow into the rotor core 122 through the first oil passage 1214.

In an embodiment, the first main flow channel 411 extends in a direction approaching the second end of the rotation shaft 121, and the extending portion of the first main flow channel 411 is provided with a second oil outlet 4112 and a third oil outlet 4113. As shown in fig. 5, the second oil outlet 4112 is located above the second rolling bearing 1212, and a plug is disposed at the outlet to prevent the cooling oil from being sprayed out from the second oil outlet 1212, and under the action of the plug and gravity, the cooling oil can slowly flow out from the second oil outlet 4112 and drop onto the second rolling bearing 1212 for lubrication. In this embodiment, the controller 20 is connected to the motor 10 through a UVWN high-voltage line, and the third oil outlet 4113 is disposed opposite to the high-voltage line, as shown in fig. 4, preferably the third oil outlet 4113 may be formed as four spray holes or provided with a spray device, and the cooling oil is sprayed out through the third oil outlet 4113 to cool the high-voltage line. It should be noted that, the connection between the controller 20 and the motor 10 through the high voltage line is only a preferred embodiment, and the third oil outlet 4113 may be adjusted according to practical requirements, for example, if there is no N phase, three spray holes may be set to correspond to the UVW high voltage line.

In one embodiment, as shown in fig. 7, the speed reducer 30 includes: the driving gear 31 is rotatably provided coaxially with the rotation shaft 121 of the rotor 12, and is fixed to a first end of the rotation shaft 121. The driven gear 32 is meshed with the driving gear 31 to form a transmission fit, and the radius of the driven gear 32 is larger than that of the driving gear 31 so as to reduce the rotating speed obtained from the rotating shaft 121 and realize a deceleration effect. The intermediate shaft 33 is coaxially rotatably disposed with the driven wheel 32, and a first end and a second end of the intermediate shaft 33 are respectively fitted with a first intermediate bearing 331 and a second intermediate bearing 332, and a second oil passage 333 is formed along the first end to the second end of the intermediate shaft 33.

Preferably, the driven gear 32 may be disposed on the first end of the intermediate shaft 33, and the direction of the first end to the second end of the intermediate shaft 33 is consistent with the direction of the first end to the second end of the rotation shaft 121 in this embodiment. In addition, there is a mating reducer housing 34 between the components of the reducer 30, and a portion of the reducer housing 34 is disposed outside the driven wheel 32 and is in mounting engagement with the integrated housing 40. The part of the reducer casing is respectively provided with a first oil duct 341, a second oil duct 342 and a third oil duct 343, so as to be connected with the second main flow passage 412, and the cooling oil can flow to various positions in the reducer 30 along the first oil duct 341, the second oil duct 342 and the third oil duct 343 for cooling and lubricating.

The first oil passage 341 is used for guiding cooling oil into the first oil passage 1214 of the rotating shaft 121, and therefore, an outlet of the first oil passage 341 is communicated with the first oil passage 1214. The second oil passage 342 is used to introduce cooling oil to the meshing position of the driving gear 31 and the driven gear 32, so as to lubricate to improve the rotation performance, and therefore, the outlet of the second oil passage 342 is disposed opposite to the driving gear 31 and/or the driven gear 32. The third oil passage 343 is for introducing cooling oil into the second oil passage 333 of the intermediate shaft 33, and therefore, the outlet of the third oil passage 343 communicates with the second oil passage 333.

Specifically, the second main flow channels 412 are correspondingly distributed on the outer wall of the integrated housing 40, and extend toward the first end of the rotating shaft 121. Meanwhile, the second main flow passage 412 is provided with a first outlet, a second outlet, and a third outlet (not shown) corresponding to the first oil passage 341, the second oil passage 342, and the third oil passage 343 on the speed reducer housing 34, respectively. In the present embodiment, the first outlet and the first oil passage 341, the second outlet and the second oil passage 342, and the third outlet and the third oil passage 343 are hermetically connected by press fit so that the cooling oil flows into the speed reducer 30.

In the present embodiment, the second main flow passage 412 is connected to the oil passage in the speed reducer case 34 only in the form of an outlet, but the present invention is not limited to this, and may be adjusted according to actual needs. For example, the second main flow channel 412 is a device or a line on the avoidance bridge, and may branch into a plurality of branches to avoid, and then be connected to an oil path on the reducer housing 34.

Wherein the cooling oil flows into the first oil passage 1214 along the first oil passage 341 to cool down the rotation shaft 121 from the inside, and flows into the second through hole 1221 of the rotor core 122 along the first connection hole 1215. The cooling oil can better contact with the rotor core 122 through the second through holes 1221, so as to enhance the cooling effect, and when the rotor core 122 is driven to rotate by the rotating shaft 121, the cooling oil splashes to the two ends of the stator winding 112 along the two ends of the second through holes 1221 under the action of centrifugal force, so as to further enhance the cooling of the stator winding 112.

The cooling oil passes through the second oil passage 342 and is sprayed onto the driving gear 31 from the outlet, thereby improving the driving performance of the driving gear 31 and the driven gear 32. Preferably, a spraying device can be arranged at the outlet of the second oil duct 342 to promote the splashing effect of the cooling oil.

In addition, in the present embodiment, the first oil passage 341 and the first oil passage 1214 are not sealed, and a first gap is formed at the connection portion, so that when the cooling oil flows into the first oil passage 1214, part of the cooling oil flows out from the first gap and lubricates the first rotating bearing 1211, thereby correspondingly improving the rotating performance of the rotor 12. Further, a second connecting hole 1216 is further formed in the rotating shaft 121 at a position of the third rotating bearing 1213, and is communicated with the first oil passage 1214 and penetrates through one side of the first oil passage 1214, so that the cooling oil in the first oil passage 1214 can also flow out of the second connecting hole 1216, lubricate the third rotating bearing 1213, and further improve the rotating performance of the rotor 12.

In this embodiment, as shown in fig. 8, the third oil passage 343 on the reducer housing 34 is connected to the second oil passage 333 in the intermediate shaft 33, and a second gap is formed at the connection, corresponding to the position of the first intermediate bearing 331. When the cooling oil flows into the third oil duct 343, most of the cooling oil enters the second oil duct 333 to cool the intermediate shaft 33, and a small part of the cooling oil drops onto the first intermediate bearing 331 along the second gap to lubricate the running fit between the first intermediate bearing 331 and the intermediate shaft 33, thereby improving the power output performance of the bridge.

Further, the second oil passage 333 penetrates through the first end and the second end of the intermediate shaft 33, the cooling oil flows in from the first end of the intermediate shaft 33, and is sprayed onto the inner wall of the integrated housing 40 from the second end, and the corresponding position of the inner wall of the integrated housing is provided with a shoulder, so that the cooling oil drops onto the second intermediate bearing 332 along the shoulder, and the second intermediate bearing 332 is lubricated. Or the connection angle of the third oil passage 343 and the second oil passage 333 may be adjusted so that the cooling oil is sprayed onto the inner wall of the second oil passage 333 along the third oil passage 343, and flows to the first intermediate bearing 331 and the second intermediate bearing 332 at both ends, respectively.

Therefore, the cooling oil cools and lubricates the bearing system in the speed reducer 30 along the second main flow passage 412 on the integrated housing 40 and the oil path in the speed reducer 30, so that the power output performance of the speed reducer 30 is greatly improved, the friction loss between gears is reduced, and meanwhile, the influence of overheating of the rotating shaft on the service life is avoided.

In a specific embodiment, the integrated oil-cooled bridge provided in this embodiment is applied to a vehicle, and therefore, the bridge further includes a differential 50 to output different torques. The differential cooperates with the intermediate shaft of the reducer 30 to obtain power input, and the differential 50 includes a gear assembly, an output shaft, and a cooperating differential housing. The intermediate shaft 33, the gear assembly and the output shaft are in transmission fit, and the power of the speed reducer 30 is regulated and then output through the output shaft. In application, the first end and the second end of the output shaft are respectively matched with a first differential bearing and a second differential bearing, so that transmission and power output are realized. In order to improve the output performance of the differential mechanism, the differential mechanism is also provided with corresponding oil ways.

Specifically, the third oil passage 343 is formed with a sub-oil passage 3431 at the first end of the intermediate shaft 33 along the cross-sectional direction thereof, and a part of the cooling oil may flow into the sub-oil passage. Correspondingly, the differential shell is provided with a corresponding first oil hole which is opposite to the position of the first differential bearing and is communicated with the sub oil duct 3431, so that the first differential bearing can be lubricated by cooling oil. Further, due to the driving engagement between the motor 10, the reduction gear 30, and the differential 50, they are in communication within the integrated housing 40. Therefore, the second oil holes are respectively formed in the integrated housing 40 corresponding to the positions of the first oil injection ring 113 and the second differential bearing, and the cooling oil sprayed by the first oil injection ring 113 splashes to the second oil holes and flows out to the second differential bearing along the second oil holes to lubricate the second differential bearing.

The cooling oil in the embodiment cools and lubricates the motor 10, the speed reducer 30 and the differential 50 along the oil cooling channel 41 and the corresponding oil path respectively, so as to correspondingly improve the power output performance of the electric bridge and prolong the service life of the electric bridge.

It should be noted that, the cooling flow passage 41 of the cooling oil and the cooling lubrication of the motor 10, the reducer 20, and the differential 50 by the oil passage are not limited to the hole site and the pipe in the embodiment, and the cooling oil may be delivered to each bearing system of the motor 10, the reducer 30, and the differential 50 by grooving or drilling the oil passage, and the like, and the structure similar to the oil delivery is within the scope of the present application.

Further, the cooling oil in the present embodiment may form an oil circulation, and the cooling oil is delivered to the motor 10, the speed reducer 30, and the bearing system of the differential 50 through the oil cooling passage 41 and the oil passage provided. In addition, the bottom of the integrated housing 40 is centered on the position of the decelerator 30, and the periphery is inclined toward the center to form an oil pool (not shown), into which the cooling oil finally drops or flows under the action of gravity. Specifically, the oil sump is located on the central axis of the motor 10 in the length direction and below the decelerator 30 to better collect the cooling oil in the integrated housing. Wherein, a corresponding oil return hole or oil return channel is arranged on the oil return path at the bottom of the integrated housing 40, so that the cooling oil can pass through. The cooling oil at the two ends of the rotor is collected through oil return holes or oil return channels and flows into the oil pool. In addition, as shown in fig. 9, the bottom of the integrated housing 40 is further provided with an oil suction port 43 and an oil suction channel 44, wherein the oil suction port 43 may be disposed at the center of both ends of the motor 10 so as to communicate with oil return paths of both ends of the rotor, and cooling oil may pass through the oil suction port 43. Meanwhile, the oil suction channel 44 extends the oil suction port 43, the other end of the oil suction channel is connected with an oil pump, and under the negative pressure effect of the oil pump, cooling oil can be pumped by the oil pump directly through the oil suction port 43 and the oil suction channel 44, so that oil circulation is realized. Furthermore, the negative pressure of the oil can be pumped by the oil pump in vacuum, so that the return of cooling oil at two ends of the motor is accelerated, the oil storage at the end part is reduced, and the risk of oil storage entering the motor air gap is reduced. In addition, the negative pressure accelerates the oil return flow speed, and the section of the oil return passage can be reduced to a certain extent, which is beneficial to reducing the envelope size. Meanwhile, the oil return flow speed is accelerated, the oil circulation is accelerated, and the oil filling amount of the cooling oil can be reduced.

An oil pump and a heat exchanger 60 are also arranged in the integrated shell 40, the oil pump pumps oil from an oil pool, and the oil pump cools down through the heat exchanger 60, so that cooling oil is formed again and conveyed into the motor 10, the speed reducer 30 and the differential 50 along an oil cold runner, and an oil circulation is formed. Preferably, a filter screen is arranged between the oil tank and the oil pump, and impurities or parts in the oil tank are filtered correspondingly.

In a specific embodiment, as shown in fig. 10, the integrated housing 40 is further provided with a water cooling channel 42, and cooling water is taken from the vehicle and flows through the controller 20, the second rotating bearing 1212 and the heat exchanger 60 along the water cooling channel 42, and then flows back to the whole vehicle to form a water cycle. The cooling water may cool down the oil input into the heat exchanger 60 to form cooling oil when flowing through the heat exchanger 60.

Wherein, the controller 20 assembly has a cold plate, and the cold plate is provided with a water inlet and a water outlet, and a water inlet 421 and a water outlet are provided at the installation position of the controller 20 corresponding to the water inlet and the water outlet, and cooling water can flow into the cold plate along the water inlet 421 and the water outlet to cool the controller 20. In this embodiment, the water inlet and the water outlet on the cold plate are connected with the water inlet 421 and the water outlet on the integrated housing in a pressing and sealing manner, and may be connected with each other through other, for example, the integrated housing 40 may be provided with a water inlet pipe and a water outlet pipe, which may be inserted into the water inlet and the water outlet of the cold plate of the controller 20, and the actual connection structure is not excessively limited.

In addition, as shown in fig. 4, a cover shell 45 is further disposed on a side of the integrated housing 40 near the second rotary bearing 1212, i.e. on the rotating side of the motor 10, and a first channel is disposed on the cover shell 45 and is matched with the water outlet hole, so that the cooling water flows out of the cold plate and then flows into the first channel to cool the second rotary bearing 1212. Preferably, the first channel is circumferentially arranged along the second rotary bearing 1212 to provide more complete cooling, and the first channel may be arranged in other ways.

As shown in fig. 11, a second channel 422 is further formed on the integrated housing 40 along the direction of the stator punching key of the motor 10 and is communicated with the first channel and the heat exchanger 60, and cooling water can well cool the stator punching key through the second channel 422, so as to avoid the risk of loosening the stator punching key under the high temperature condition.

The water cooling channel in this embodiment can not only cool down the control panel, and carries out the cooling effect to second rolling bearing and electron towards the key along the water route that sets up, finally can also cool down the oil in the heat exchanger, promotes to form the oil circulation in the electric bridge, promotes the power take off performance of electric bridge and increase of service life correspondingly.

In summary, the integrated oil-cooled bridge provided by the invention fully utilizes the advantages of oil cooling, optimizes the cooling design on the basis of the traditional stator-rotor oil cooling design, cools the motor, the speed reducer and the differential, prolongs the service life of the bridge, and has high reliability; and lubricate all bearings on motor, reduction gear and differential mechanism, promote the output performance of electric bridge correspondingly, and the lubricating oil mass realizes initiative adjustable through the oil pump to with assembly rotational speed decoupling, strong adaptability. Meanwhile, a water cooling channel is correspondingly added, so that the cooling design is optimized, the controller, namely the stator punching key, is cooled, oil circulation in the bridge is facilitated through the heat exchanger, and the oil cooling efficiency is improved. The integrated oil-cooled bridge three-in-one highly integrated design adopts the integrated shell, so that the number of matching surfaces and the number of connecting pieces can be reduced, and the size and the weight of the assembly are reduced. The oil cooling flow channel and the water cooling channel are integrated inside the shell, an external pipeline is not required to be integrated, the outer boundary is neat and compact, the reliability is good, and the practicability is high.

The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

In the description herein, numerous specific details are provided, such as examples of components and/or methods, to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that an embodiment of the invention can be practiced without one or more of the specific details, or with other apparatus, systems, components, methods, components, materials, parts, and so forth. In other instances, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the invention.

Reference throughout this specification to "one embodiment," "an embodiment," or "a particular embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment, and not necessarily all embodiments, of the present invention. Thus, the appearances of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics of any specific embodiment of the present invention may be combined in any suitable manner with one or more other embodiments. It will be appreciated that other variations and modifications of the embodiments of the invention described and illustrated herein are possible in light of the teachings herein and are to be considered as part of the spirit and scope of the invention.

It will also be appreciated that one or more of the elements shown in the figures may also be implemented in a more separated or integrated manner, or even removed because of inoperability in certain circumstances or provided because it may be useful depending on the particular application.

In addition, any labeled arrows in the drawings/figures should be considered only as exemplary, and not limiting, unless otherwise specifically indicated. Furthermore, the term "or" as used herein is generally intended to mean "and/or" unless specified otherwise. Combinations of parts or steps will also be considered as being noted where terminology is foreseen as rendering the ability to separate or combine is unclear.

As used in the description herein and throughout the claims that follow, unless otherwise indicated, "a", "an", and "the" include plural references. Also, as used in the description herein and throughout the claims that follow, unless otherwise indicated, the meaning of "in …" includes "in …" and "on …".

The above description of illustrated embodiments of the invention, including what is described in the abstract, is not intended to be exhaustive or to limit the invention to the precise forms disclosed herein. Although specific embodiments of, and examples for, the invention are described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the present invention, as those skilled in the relevant art will recognize and appreciate. As noted, these modifications can be made to the present invention in light of the foregoing description of illustrated embodiments of the present invention and are to be included within the spirit and scope of the present invention.

The systems and methods have been described herein in general terms as being helpful in understanding the details of the present invention. Furthermore, various specific details have been set forth in order to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that an embodiment of the invention can be practiced without one or more of the specific details, or with other apparatus, systems, assemblies, methods, components, materials, parts, and/or the like. In other instances, well-known structures, materials, and/or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the invention.

Thus, although the invention has been described herein with reference to particular embodiments thereof, a latitude of modification, various changes and substitutions are intended in the foregoing disclosures, and it will be appreciated that in some instances some features of the invention will be employed without a corresponding use of other features without departing from the scope and spirit of the invention as set forth. Therefore, many modifications may be made to adapt a particular situation or material to the essential scope and spirit of the present invention. It is intended that the invention not be limited to the particular terms used in following claims and/or to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Accordingly, the scope of the invention should be determined only by the following claims.

Claims

1. An integrated oil cooled bridge comprising: the integrated shell, and motor, controller and speed reducer installed on the integrated shell, and the motor is in transmission fit with the speed reducer, and the motor is electrically connected with the controller;

the integrated shell is provided with an oil cooling channel, the oil cooling channel comprises a first main channel and a second main channel, and the motor and the speed reducer are provided with corresponding oil ways which are respectively connected with the first main channel and the second main channel, so that cooling oil cools a rotor and a stator of the motor along the oil ways and lubricates bearings on the speed reducer.

2. The integrated oil cooled bridge of claim 1, wherein the motor comprises:

a stator fixed within the integrated housing, and the stator comprising:

the stator iron core is adhered and fixed with the inner wall of the integrated shell, and the two ends of the stator iron core are respectively provided with a first oil injection ring and a second oil injection ring;

the stator core is circumferentially provided with a first through hole for communicating the first oil injection ring and the second oil injection ring;

the stator winding is fixed on the stator core, and two ends of the stator winding are respectively arranged corresponding to the first oil injection ring and the second oil injection ring;

And the rotor is in rotating fit with the stator.

3. The integrated oil-cooled bridge of claim 2, wherein the first primary flowpath is formed on an outer wall of the integrated housing and is disposed in correspondence with the stator core; a first oil outlet is arranged on the first main runner and communicated with the second oil spraying ring; the cooling oil flows into the second oil injection ring from the first oil outlet along the first main flow channel.

4. The integrated oil cooled bridge of claim 2, wherein the first oil spray ring and the second oil spray ring are entirely or partially unsealed; the first oil spraying ring, the second oil spraying ring and the first through hole are in quasi-sealing fit.

5. The integrated oil cooled bridge of claim 2, wherein the rotor comprises:

the first end of the rotating shaft is matched with a first rotating bearing, the second end of the rotating shaft is matched with a second rotating bearing, and the shaft body is matched with a third rotating bearing; a first oil pipeline is formed in the rotating shaft along the first end;

the rotor iron core is coaxially and fixedly connected with the rotating shaft;

the rotating discs are fixed at two ends of the rotor core;

The iron core is circumferentially provided with a second through hole, a first connecting hole is formed between the rotating shaft and the rotating disc, and penetrates through one attached side of the rotating shaft and the rotating disc to be communicated with the first oil pipeline and the second through hole.

6. The integrated oil-cooled bridge of claim 5, wherein a second connecting hole is formed in the rotating shaft at a position corresponding to the third bearing, and penetrates through one side of the first oil passage, so that cooling oil can flow out to the third bearing along the second connecting hole.

7. The integrated oil cooled bridge of claim 5, wherein the first primary flow passage further extends in a direction proximate the second end of the rotational axis.

8. The integrated oil-cooled bridge of claim 7, wherein a second oil outlet is further provided in the first main flow passage and above the second rolling bearing; and a plug is arranged at the outlet of the second oil outlet, and the cooling oil flows out of the second oil outlet along the first main runner and drops onto the second rotating bearing.

9. The integrated oil-cooled bridge of claim 7, wherein the first primary runner is further provided with a third oil outlet; and the cooling oil flows out of the third oil outlet along the first main runner and is sprayed onto a high-voltage wire electrically connected with the motor and the controller.

10. An integrated oil cooled bridge according to claim 3, wherein the decelerator comprises:

the driving gear is coaxially and rotatably arranged with the rotating shaft;

the driven gear is in transmission fit with the driving gear;

the first end of the intermediate shaft is matched with a first intermediate bearing, and the second end of the intermediate shaft is matched with a second intermediate bearing; the intermediate shaft and the driven wheel are coaxially and rotatably arranged;

the speed reducer comprises a speed reducer shell, a first oil duct, a second oil duct and a third oil duct;

the outlet of the first oil duct is communicated with the first oil duct, and the outlet of the second oil duct is arranged corresponding to the matching position of the driving gear and the driven gear; and a second oil channel is formed in the middle shaft along the direction from the first end to the second end, and the outlet of the third oil channel is communicated with the second oil channel.

11. The integrated oil-cooled bridge of claim 10, wherein the second main flow passage is provided with a first outlet, a second outlet, and a third outlet, respectively, and is correspondingly connected to the inlet of the first oil passage, the inlet of the second oil passage, and the inlet of the third oil passage.

12. The integrated oil cooled bridge of claim 11 wherein a first gap is formed between the outlet of the first oil gallery and the first oil passage, and wherein the first gap is located in correspondence with the first rotational bearing; wherein the cooling oil flows out from the first gap to the first rolling bearing along the first oil passage.

13. The integrated oil cooled bridge of claim 11, wherein a second gap is formed between the outlet of the third oil gallery and the second oil gallery, and the second gap is located in correspondence with the first intermediate bearing; wherein the cooling oil flows out from the second gap to the first intermediate bearing along the third oil passage.

14. The integrated oil cooled bridge of claim 13, further comprising: the differential mechanism is in transmission fit with the intermediate shaft;

the differential comprises a gear assembly, an output shaft and a differential shell, wherein the gear assembly is respectively in transmission fit with the intermediate shaft and the output shaft, and the output shaft is used for being connected with an external device.

15. The integrated oil cooled bridge of claim 14, wherein the first end of the output shaft is fitted with a first differential bearing;

the third oil duct is formed with a sub-oil duct at the first end of the intermediate shaft along the cross section direction of the intermediate shaft, and a first oil hole is formed in the differential housing, is correspondingly arranged with the first differential bearing and is communicated with the sub-oil duct, so that cooling oil drops onto the first differential bearing along the first oil hole.

16. The integrated oil cooled bridge of claim 14, wherein the second end of the output shaft is fitted with a second differential bearing;

the integrated shell is internally provided with a second oil hole which is respectively arranged corresponding to the first oil injection ring and the second differential bearing, so that the cooling oil flows from the second oil hole to the second differential bearing along the first oil injection ring.

17. The integrated oil cooled bridge of claim 1, wherein a bottom of the integrated housing is provided with an oil sump for collecting the cooling oil; the bottom of the integrated shell is inclined along the direction in which two ends of the motor converge towards the center and the direction in which the motor approaches the speed reducer, so that the oil pool is formed.

18. The integrated oil-cooled bridge of claim 17, wherein the integrated housing bottom is correspondingly provided with oil return holes or oil return channels along a path along which two ends of the motor converge toward the center and/or along a path along which the motor approaches the speed reducer, so that cooling oil can flow into the oil pool.

19. The integrated oil cooled bridge of claim 17 further comprising a heat exchanger and an oil pump, and wherein the oil pump draws oil from the oil sump and inputs the oil to the heat exchanger for cooling to form the cooling oil.

20. The integrated oil-cooled bridge of claim 19, wherein the integrated housing bottom has oil suction ports at the centers of the two ends of the motor, and oil suction channels are provided in extension with the oil suction ports; the other end of the oil suction channel is connected with the oil pump.

21. The integrated oil cooled bridge of claim 19, wherein the integrated housing is further provided with a water cooling channel; and cooling water flows through the controller, the second rotating bearing and the heat exchanger along the water cooling channel and flows out of the heat exchanger.

22. The integrated oil cooled bridge of claim 21, wherein the controller includes a cooling plate, and wherein the cooling plate has a water inlet and a water outlet; the integrated shell is provided with a water inlet hole and a water outlet hole which correspond to the water inlet and the water outlet respectively; wherein, the cooling water flows into the cold plate from the water inlet hole and flows out from the water outlet hole.

23. The integrated oil cooled bridge of claim 22, wherein a cover is further provided on a side of the integrated housing adjacent to the second rotating bearing, and a first channel is provided on the cover to cooperate with the water outlet hole, so that cooling water flows into the first channel; and the first passage is provided outside the second rolling bearing.

24. The integrated oil cooled bridge of claim 23, wherein the first channel is circumferentially disposed about the second rotational bearing.

25. The integrated oil cooled bridge of claim 23, wherein the integrated housing further has a second channel disposed thereon that communicates with the first channel and the heat exchanger, and wherein the second channel is disposed outside of the stator key of the motor.