Electric drive axle assembly

Abstract

The utility model relates to an electric drive axle assembly, belongs to the technical field of automobile production and manufacturing, and solves the technical problem that the power supply efficiency of an electric drive axle assembly in the prior art needs to be further improved. The electric drive axle assembly comprises an axle housing. The two motors are both installed in the axle housing, rotating shafts of the two motors face the two sides respectively and extend out of the axle housing, and the rotating shafts of the two motors are directly connected with the two wheel ends respectively. The two motors in the axle housing respectively drive the wheel ends at the two ends of the axle housing to rotate, so that a differential mechanism and a speed reducer do not need to be arranged, and compared with the prior art, due to no power consumption of the differential mechanism and the speed reducer, the loss of power transmitted to the wheel ends by the electric drive axle assembly is smaller, and therefore the power consumption is reduced. According to the electric drive axle assembly, the efficiency of supplying power to the wheel ends is higher, and in addition, the two motors are installed in the axle housing, so that the whole electric drive axle assembly is more compact in structure and smaller in size, and the required space size during installation is smaller.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile production and manufacturing, and particularly relates to an electric drive axle assembly. Background Art

[0002] As an important component of new energy vehicles, the performance of electric drive axles directly affects the power of new energy vehicles. Traditional electric drive axles include a bridge housing and a drive shaft located in the bridge housing. The drive shaft is driven to rotate by an electric motor installed outside the bridge housing. The motor of this type of electric drive axle assembly is placed outside the bridge housing, the structure is not compact, and the required installation space is large. With the development of technology, coaxial electric drive axle assemblies have appeared in the prior art, and the motor is installed inside the bridge housing, and the motor is used to drive the wheel ends at both ends of the bridge housing to rotate.

[0003] However, all current electric drive axle assemblies need to be equipped with differentials, and some electric drive axle assemblies also need to be equipped with speed reducers. The differentials and speed reducers will consume part of the kinetic energy transmitted to the wheel ends. Based on this, the power supply efficiency of the electric drive axle assembly in the prior art needs to be further improved. Utility Model Content

[0004] The utility model provides an electric drive axle assembly, which is used to solve the technical problem that the power supply efficiency of the electric drive axle assembly in the prior art needs to be further improved.

[0005] The utility model is realized by the following technical scheme: an electric drive axle assembly, comprising:

[0006] Axle housing;

[0007] Two electric motors are both installed inside the bridge housing, the rotating shafts of the two electric motors are respectively oriented to two sides and extend out of the bridge housing, and the rotating shafts of the two electric motors are directly connected to two wheel ends respectively.

[0008] Furthermore, in order to better implement the utility model, the motor includes:

[0009] A stator is inserted into the bridge housing, and the stator is fixedly connected to the bridge housing;

[0010] A rotor is rotatably disposed in the stator, and a rotating shaft of the motor is disposed in the rotor and is linked to the rotor;

[0011] Two bearing seats are provided with bearings, one of which is located in the middle of the bridge housing and the other is located at the end of the bridge housing. The rotating shaft of the motor is plugged into and matched with the bearings of the two bearing seats so that the rotating shaft of the motor is rotatably connected to the bridge housing.

[0012] Furthermore, in order to better implement the present utility model, the bearing seat located in the middle of the bridge housing is a shaft end support seat, and a gap is provided between the shaft end support seats of the two motors.

[0013] Furthermore, in order to better implement the utility model, the motor also includes:

[0014] The terminal is used for connecting electric wires to supply power to the motor, and the terminal is plugged into the middle side wall of the bridge housing.

[0015] Furthermore, in order to better realize the utility model, a convex ring is provided in the middle of the bridge housing, the convex ring corresponds to the shaft end support seat and the gap, a cover plate is covered on the free end of the convex ring, and the terminal is installed on the cover plate.

[0016] Furthermore, in order to better implement the present invention, it also includes:

[0017] An oil cooling assembly is installed outside the bridge housing, and the oil cooling assembly is used to provide oil cooling for the electric motor.

[0018] Furthermore, in order to better implement the utility model, the oil cooling assembly includes:

[0019] An oil pump is installed on the middle outer wall of the axle housing, and the oil pump and the convex ring are respectively arranged on both sides of the axle housing;

[0020] Two oil pipes are connected to the oil outlet of the oil pump, an oil inlet is provided at both ends of the bridge housing, and the free ends of the two oil pipes are connected to the two oil inlets respectively;

[0021] An oil return port is provided on the side wall of the gap, an oil flow channel is provided on the shaft end support seat, and the gap between the rotor and the stator and the oil flow channel are connected to the oil return port and the oil inlet;

[0022] The oil inlet end of the oil pump is connected to the oil return port.

[0023] Furthermore, in order to better realize the utility model, the bearing seat located at the end of the bridge housing is a shaft support seat, there is a gap between the end faces of the stator and the rotor and the shaft support seat, and the oil inlet is opened on the side wall of the gap.

[0024] Furthermore, in order to better implement the present invention, a mounting portion is fixedly provided at the end of the rotating shaft of the motor, and the mounting portion is used to be directly connected to the wheel end.

[0025] Furthermore, in order to better implement the present utility model, the mounting portion includes:

[0026] The mounting plate is integrally formed with the rotating shaft of the motor, and a through hole for passing a bolt is opened on the mounting plate, and a bolt for directly connecting with the wheel end is passed through the through hole.

[0027] Compared with the prior art, the utility model has the following beneficial effects:

[0028] The electric drive axle assembly provided by the utility model comprises an axle housing and two motors, the two motors are both installed inside the axle housing, and the rotating shafts of the two motors face both sides and extend out of the axle housing, and the rotating shafts of the two motors are directly connected to the two wheel ends respectively.

[0029] Through the above structure, the rotating shafts of the two motors in the bridge housing are directly connected to the wheel ends, that is, the two motors respectively drive the wheel ends at both ends of the bridge housing to rotate. In this way, there is no need to set a differential and a reducer. Compared with the prior art, since there is no power consumption of the differential and the reducer, the power loss transmitted to the wheel end by the electric drive bridge assembly is smaller. Therefore, the electric drive bridge assembly is more efficient in supplying power to the wheel end. In addition, the two motors are installed inside the bridge housing, so the structure of the entire electric drive bridge assembly is more compact and the space required for installation is smaller. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a structural schematic diagram of an electric drive axle assembly provided by an embodiment of the utility model;

[0032] Figure 2 yes Figure 1 A cross-sectional view of the electric drive axle assembly shown;

[0033] Figure 3 It is a structural schematic diagram of the oil flow channel in the embodiment of the utility model.

[0034] In the figure:

[0035] 100-bridge housing, 110-convex ring, 120-cover plate, 130-oil return port, 200-motor, 210-stator, 220-rotor, 230-rotating shaft, 231-mounting plate, 240-shaft end support seat, 241-oil flow channel, 250-shaft middle support seat, 260-terminal, 300-oil cooling assembly, 310-oil pump, 320-oil pipe, 400-bolt, 500-bridge end mounting support. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0037] Example:

[0038] The electric drive axle assembly provided by the utility model is as follows Figure 1 and Figure 2 As shown, it includes a bridge housing 100 and two electric motors 200, wherein:

[0039] The bridge housing 100 is a tubular structure, and like the existing bridge housing 100, bridge end mounting brackets 500 for mounting and sealing are provided at both ends. The two motors 200 are both mounted inside the bridge housing 100, and the rotating shafts 230 of the two motors 200 extend out of the bridge housing 100 toward both sides, that is, the rotating shafts 230 of the two motors 200 extend out of the bridge housing 100 from the openings at both ends of the bridge housing 100. Moreover, the rotating shafts 230 of the two motors 200 are directly connected to the two wheel ends, respectively, so that the power output by the motors 200 is directly transmitted to the wheel ends.

[0040] Through the above structure, the rotating shafts 230 of the two motors 200 in the bridge housing 100 are directly connected to the wheel ends, that is, the two motors 200 respectively drive the wheel ends at both ends of the bridge housing 100 to rotate. In this way, there is no need to set a differential and a reducer. Compared with the prior art, since there is no power consumption of the differential and the reducer, the power loss transmitted to the wheel end by the electric drive bridge assembly is smaller. Therefore, the electric drive bridge assembly is more efficient in supplying power to the wheel end. In addition, the two motors 200 are installed inside the bridge housing 100, so the structure of the entire electric drive bridge assembly is more compact, the volume is smaller, and the space required for installation is smaller.

[0041] Optionally, the motor 200 includes a stator 210, a rotor 220 and a bearing seat, wherein:

[0042] The stator 210 is disposed in the bridge housing 100. It should be noted that the stator 210 in this embodiment has a long strip-shaped outline, which extends from the middle of the bridge housing 100 to the end of the bridge housing 100, that is, the stators 210 of the two motors 200 are respectively located on both sides of the center of the bridge housing 100. The stator 210 is fixedly connected to the bridge housing 100. Specifically, the connection between the stator 210 and the bridge housing 100 can be a mechanical connection (such as a bolt connection, a pin connection or a slot connection), or a welding connection, and of course, a crimping connection (that is, using an external force to press the stator 210 and the bridge housing 100 together to form a relatively stable fixed connection).

[0043] The rotor 220 is rotatably inserted into the stator 210. The rotating shaft 230 of the motor 200 is inserted into the rotor 220 and linked with the rotor 220. Like a conventional motor, the rotor 220 drives the rotating shaft 230 to rotate. The connection between the rotor 220 and the rotating shaft 230 can be a latch connection, a key connection, etc. The rotor 220 is adapted to the stator 210, that is, the rotor 220 is also in a long strip structure.

[0044] There are two bearing seats, one of which is located in the middle of the bridge housing 100, and the other is located at the end of the bridge housing 100. The rotating shaft 230 of the motor 200 is plugged into the bearings of the two bearing seats. Specifically, the rotating shaft 230 is inserted into the inner ring of the bearing and has an interference fit with the inner ring of the bearing, so that the rotating shaft 230 of the motor 200 is rotatably connected with the bridge housing 100, and the bearings of the above-mentioned bearing seats support the rotation of the rotating shaft 230. It is defined that on the same rotating shaft 230, the bearing seat located in the middle of the bridge housing 100 is the shaft end support seat 240, which supports the end of the rotating shaft 230, and the bearing seat located at the end of the bridge housing 100 is the shaft center support seat 250, and the shaft center support seat 250 supports the middle of the rotating shaft 230. With the help of the above-mentioned shaft center bearing seat and shaft end support seat 240, the rotating shaft 230 of the motor 200 can be rotated smoothly in the bridge housing 100.

[0045] Through the above structure, the bridge housing 100 actually serves as a common housing for the two motors 200, thereby making the structure more compact and making the structure of the electric drive bridge assembly simpler.

[0046] Optimally, a gap is provided between the shaft end support seats 240 (i.e., the two bearing seats located in the middle of the bridge housing 100) of the two motors 200 in this embodiment, that is, the two motors 200 are spaced apart in the bridge housing 100, so that the two motors 200 can operate independently and reduce interference caused by each other.

[0047] Of course, the motor 200 further includes a terminal 260 , which is mounted on the middle side wall of the bridge housing 100 . The terminal 260 is used to supply power to the motor 200 so that the motor 200 can be powered on and run.

[0048] As an optional implementation of this embodiment, the terminal 260 in this embodiment directly penetrates the middle side wall of the bridge housing 100 and is connected to the above-mentioned motor 200. As the best implementation of this embodiment, in this embodiment, if Figure 1 and Figure 2 As shown, a convex ring 110 is provided in communication with the middle of the bridge housing 100, and the convex ring 110 corresponds to the two shaft end support seats 240 and the gap, and a cover plate 120 is covered on the free end of the convex ring 110. In this case, the convex ring 110 and the cover plate 120 actually constitute a part of the bridge housing 100, and the terminal 260 is installed on the cover plate 120. The cover plate 120 can be disassembled on the convex ring 110. When wiring and maintenance are required, the cover plate 120 is removed from the convex ring 110, so that wiring and maintenance can be more convenient.

[0049] An optional implementation of this embodiment is as follows: an oil cooling assembly 300 for providing oil cooling for the motor 200 is also installed outside the bridge housing 100. The oil cooling assembly 300 can take away part of the heat generated by the motor 200 during operation, thereby dissipating heat and cooling the running motor 200.

[0050] Optionally, the oil cooling assembly 300 in this embodiment includes an oil pump 310 and two oil pipes 320. The oil pump 310 is installed on the middle outer wall of the above-mentioned bridge housing 100. The oil pump 310 and the above-mentioned flange 110 are respectively located on both sides of the bridge housing 100. It should be noted that the oil pump 310 in this embodiment is a pump body with a built-in cooling system. This type of pump body belongs to the prior art, so it will not be described in detail here. The two oil pipes 320 are both connected to the oil outlet end of the oil pump 310, so that the oil pump 310 can inject cooling oil into the oil pipes 320. An oil inlet is respectively provided on the side walls at both ends of the bridge housing 100, and the free ends of the two oil pumps 310 are respectively connected to the two oil inlets, so that the cooling oil can enter the interior of the bridge housing 100 from the above-mentioned oil inlet through the diversion effect of the oil pipe 320. Figure 3 As shown, an oil return port 130 is provided on the side wall of the gap, and oil flow channels 241 are provided on the two shaft end support seats 240. As in the prior art, there is a gap between the rotor 220 and the stator 210 of the motor 200, and the gap between the rotor 220 and the stator 210 and the oil flow channel 241 connect the oil return port 130 and the oil inlet. The oil inlet end of the oil pump 310 is connected to the oil return port 130.

[0051] In this way, the oil pump 310 injects the cooling oil into the oil pipe 320, and then the cooling oil enters the bridge housing 100 from the oil inlet, and then the cooling oil passes through the gap between the stator 210 and the rotor 220 of the motor 200, taking away part of the heat generated when the motor 200 is running, and then the cooling oil flows to the above-mentioned oil flow channel 241, and then flows through the oil flow channel 241 to the gap between the two shaft end support seats 240, and finally flows back to the oil pump 310 from the oil return port 130. In this way, a closed cooling oil circulation flow path is formed. The cooling oil flowing back to the oil pump 310 is cooled by the cooling system of the oil pump 310, and the motor 200 is cooled in this way.

[0052] Of course, the oil pipe 320 in the above-mentioned oil cooling assembly 300 can also be a pipe attached to the outer wall of the bridge housing 100. One end of the oil pipe 320 is connected to the oil outlet end of the oil pump 310, and the other end of the oil pipe 320 is connected to the oil inlet end of the oil pump 310. The oil pump 310 is used to make the cooling oil circulate in the oil pipe 320, and the heat generated by the engine operation is transferred to the cooling oil through the bridge housing 100 and the oil pipe 320.

[0053] Preferably, in this embodiment, there is a gap between the shaft support seat 250 located at the end of the bridge housing 100 and the end faces of the stator 210 and the rotor 220, and the oil inlet is opened on the side wall of the gap, so that the cooling oil sent into the bridge housing 100 by the oil pipe 320 first reaches the gap, and then flows from the gap into the gap between the stator 210 and the rotor 220. The shaft support seat 250 in this embodiment is installed with an oil seal structure to avoid oil leakage. It is worth noting that the bearing seat installed with the oil seal structure has been commonly used in the prior art, so it will not be described in detail here.

[0054] In order to make the rotating shaft 230 of the motor 200 directly connected to the wheel end, an optional implementation of this embodiment is as follows: a mounting portion is fixedly provided at the end of the rotating shaft 230 of the motor 200 (the end located outside the bridge housing 100), and the mounting portion is directly connected to the wheel end. Optionally, the mounting portion includes a mounting plate 231, which is integrally formed with the rotating shaft 230 of the motor 200, and a through hole for passing the bolt 400 is opened on the mounting plate 231, and the bolt 400 for direct connection with the wheel end is inserted in the through hole. Of course, the mounting plate 231 can also be fixed to the end of the rotating shaft 230 by welding.

[0055] There are multiple through holes, which are evenly distributed around the central axis of the mounting plate 231 (ie, the central axis of the rotating shaft 230 ), and each through hole is penetrated by one of the bolts 400 .

[0056] In addition, a plurality of connecting posts may be integrally formed on the mounting plate 231 , each of which is provided with an external thread to form a stud, and the wheel end may be directly mounted using the connecting posts.

[0057] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope recorded in the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An electric drive axle assembly, characterized in that: include: Axle housing (100); The two motors (200) are both installed inside the bridge housing (100), the rotating shafts (230) of the two motors (200) are respectively oriented toward two sides and extend out of the bridge housing (100), and the rotating shafts (230) of the two motors (200) are respectively directly connected to the two wheel ends.

2. The electric drive axle assembly according to claim 1, characterized in that: The electric motor (200) comprises: A stator (210) is inserted into the axle housing (100), and the stator (210) is fixedly connected to the axle housing (100); A rotor (220) is rotatably disposed in the stator (210), and a rotating shaft (230) of the motor (200) is disposed in the rotor (220) and is linked to the rotor (220); Two bearing seats are provided with bearings, one of which is located in the middle of the bridge housing (100) and the other is located at the end of the bridge housing (100). The rotating shaft (230) of the motor (200) is plug-fitted with the bearings of the two bearing seats so that the rotating shaft (230) of the motor (200) is rotatably connected to the bridge housing (100).

3. The electric drive axle assembly according to claim 2, characterized in that: The bearing seat located in the middle of the bridge housing (100) is a shaft end support seat (240), and a gap is provided between the shaft end support seats (240) of the two motors (200).

4. The electric drive axle assembly according to claim 3, characterized in that: The electric motor (200) further comprises: The terminal (260) is used to connect electric wires to supply power to the motor (200), and the terminal (260) is plugged into the middle side wall of the bridge housing (100).

5. The electric drive axle assembly according to claim 4, characterized in that: A convex ring (110) is provided in the middle of the bridge housing (100), the convex ring (110) corresponds to the shaft end support seat (240) and the gap, a cover plate (120) is covered on the free end of the convex ring (110), and the terminal (260) is installed on the cover plate (120).

6. The electric drive axle assembly according to claim 5, characterized in that: Also includes: An oil cooling assembly (300) is installed outside the bridge housing (100), and the oil cooling assembly (300) is used to provide oil cooling for the electric motor (200).

7. The electric drive axle assembly according to claim 6, characterized in that: The oil cooling assembly (300) comprises: An oil pump (310) is installed on the middle outer wall of the axle housing (100), and the oil pump (310) and the convex ring (110) are respectively arranged on two sides of the axle housing (100); Two oil pipes (320) are connected to the oil outlet of the oil pump (310), an oil inlet is provided at both ends of the bridge housing (100), and the free ends of the two oil pipes (320) are respectively connected to the two oil inlets; An oil return port (130) is provided on the side wall of the gap, an oil flow channel (241) is provided on the shaft end support seat (240), and the gap between the rotor (220) and the stator (210) and the oil flow channel (241) are connected to the oil return port (130) and the oil inlet; The oil inlet end of the oil pump (310) is connected to the oil return port (130).

8. The electric drive axle assembly according to claim 7, characterized in that: The bearing seat located at the end of the bridge housing (100) is a shaft support seat (250), and there is a gap between the end faces of the stator (210) and the rotor (220) and the shaft support seat (250), and the oil inlet is opened on the side wall of the gap.

9. The electric drive axle assembly according to any one of claims 1 to 8, characterized in that: A mounting portion is fixedly provided at the end of the rotating shaft (230) of the motor (200), and the mounting portion is used to be directly connected to the wheel end.

10. The electric drive axle assembly according to claim 9, characterized in that: The mounting portion comprises: A mounting plate (231) is formed integrally with the rotating shaft (230) of the motor (200), and a through hole for passing a bolt (400) is provided on the mounting plate (231), wherein the bolt (400) for direct connection with the wheel end is passed through the through hole.

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