CN217944878U - Coaxial drive arrangement and vehicle - Google Patents

Abstract

The utility model provides a coaxial driving device and a vehicle, wherein the coaxial driving device includes: a housing support frame, a driving motor, a composite planet carrier, an NW planetary gear train and a differential gear train; wherein the driving motor is installed on the housing support frame; the composite planetary frame is rotatably installed on the housing support frame; the NW planetary gear train is installed on the composite planetary frame, and the inside of the NW planetary gear train is provided with a center of rotation cavity, the NW planetary gear train is connected to the drive motor; the differential gear train is installed on the composite planet carrier and is located in the center of rotation cavity, and the outer diameter of the differential gear train track is larger than that of the NW planet The inner diameter of the running track of the gear train; the driving motor, the compound planetary carrier, the NW planetary gear train and the differential gear train are arranged coaxially. The utility model is used to improve the problem of large radial and axial dimensions existing in the existing coaxial driving device.

Description

A coaxial drive device and vehicle

technical field

The utility model relates to the field of vehicle drive, in particular to a coaxial drive device and a vehicle.

Background technique

With the further tightening of global carbon emission policies and the promotion of pure electric new energy vehicles in the country, it is necessary to seek electric drive assemblies with better performance and layout to apply to the development of pure electric vehicles. At present, the electric drive powertrain is divided into two categories: parallel shaft and coaxial. The coaxial is easy to arrange, especially the coaxial planetary row has the characteristics of high power density. However, the existing coaxial driving device has the problem of large radial dimension and large axial dimension.

Utility model content

In view of the above shortcomings of the prior art, the utility model provides a coaxial drive device and a vehicle to improve the problem of large radial and axial dimensions existing in the existing coaxial drive device.

In order to achieve the above purpose and other related purposes, the utility model provides a coaxial driving device, including: a housing support frame, a driving motor, a composite planet carrier, an NW planetary gear train and a differential gear train; wherein, the driving motor is installed on the housing support frame; the composite planetary frame is rotatably installed on the housing support frame; the NW planetary gear train is installed on the composite planetary frame, and the inside of the NW planetary gear train is provided with a center of rotation cavity, the NW planetary gear train is connected to the drive motor; the differential gear train is installed on the compound planet carrier and is located in the center of rotation cavity, and the outer diameter of the differential gear train track is larger than that of the NW planet The inner diameter of the running track of the gear train; the drive motor, the compound planetary carrier, the NW planetary gear train and the differential gear train are arranged coaxially.

In one embodiment of the present utility model, the differential gear train includes: a differential planetary gear and a side gear, the differential planetary gear is rotatably mounted on the composite planet carrier, and the differential planetary gear and the The side gear meshes.

In one embodiment of the present utility model, the NW planetary gear train includes: a sun gear, a tower type double-teeth planetary gear and an inner ring gear, the sun gear is connected to the output shaft of the driving motor, and the tower The double-toothed planetary gear meshes with the sun gear, and the ring gear meshes with the double-toothed planetary gear of the tower type.

In one embodiment of the present utility model, the inner ring gear is installed on the housing support frame, and the compound planet carrier is located inside the inner ring gear.

In one embodiment of the present invention, the differential gear train includes several differential planetary gears, the NW planetary gear train includes several tower-type double-tooth planetary gears, and the tower-type double-tooth planetary gears The number corresponds to the number of the differential planetary gears.

In an embodiment of the present utility model, the number of the tower-type double-toothed planetary gears is equal to the number of the differential planetary gears.

In one embodiment of the present invention, each of the tower-type double-toothed planetary gears includes a large planetary gear and a small planetary gear, the large planetary gear and the small planetary gear are coaxially connected, and the large planetary gear and the small planetary gear are coaxially connected. The sun gear is meshed, the small planetary gear is meshed with the ring gear, and the small planetary gear and the differential planetary gear are alternately and equally spaced.

In one embodiment of the present invention, the composite planetary carrier includes a planetary carrier housing, and the planetary carrier housing is provided with a first planetary carrier support position, a large planetary wheel support position, a small planetary wheel support position, a sun gear Support position and differential planetary gear support position.

In one embodiment of the present invention, the housing support frame includes: a housing, on which are provided a second planet carrier support position, a first motor rotor support position, a second motor rotor support position, internal teeth Ring support position and motor stator support position.

A vehicle, the vehicle is provided with the coaxial drive device.

The coaxial drive device of the utility model, the differential gear train is located in the slewing center cavity of the NW planetary gear train, and the differential gear train is embedded inside the planetary gear train to achieve a smaller axial size, which is beneficial to the whole vehicle The layout of the driving half shaft is beneficial to the layout of the front wheel steering gear. At the same time, because the outer diameter of the running track of the differential gear train is larger than the inner diameter of the running track of the NW planetary gear train, the radial size of the entire device becomes smaller, and the smaller radial size can bring higher ground clearance and more freedom. The Z-direction layout space is more convenient to integrate the motor controller.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic diagram of the principle of the coaxial driving device described in the present invention in an embodiment;

Fig. 2 is a schematic diagram of the principle of the NW planetary gear train described in the present invention in an embodiment;

Fig. 3 is a schematic diagram of the principle of the differential gear train described in the present invention in an embodiment;

Fig. 4 is the arrangement diagram of the planetary gear described in the utility model;

Fig. 5 is a schematic diagram of the principle of the composite planetary carrier described in the present invention in an embodiment;

Fig. 6 is a schematic diagram of the principle of the housing support frame in an embodiment of the present invention;

Component designation description

1. Coaxial drive device; 2. NW planetary gear train; 21. Sun gear; 22. Tower type double gear planetary gear; 221. Large planetary gear; 222. Small planetary gear; 23. Internal gear; 3. Differential gear train; 31. Differential planetary gear; 32. Half shaft gear; 33. Ball joint; 4. Composite planetary carrier; 41. Planetary carrier shell; 42. First planetary carrier support position; 43. Small planetary wheel Support position; 44, large planetary wheel support position; 45, sun gear support position; 46, differential planetary wheel support position; 5, drive motor; 51, motor stator; 52, motor rotor; 6, housing support frame; 61 , the second planet carrier support position; 62, the first motor rotor support position; 63, the second motor rotor support position; 64, the inner ring gear support position; 65, the motor stator support position.

Detailed ways

The implementation of the present utility model is described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The utility model can also be implemented or applied through other different specific implementation modes, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the utility model. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other. It should also be understood that the terminology used in the embodiments of the present utility model is for describing a specific implementation, but not for limiting the protection scope of the present utility model. The test methods for which specific conditions are not indicated in the following examples are usually in accordance with conventional conditions, or in accordance with the conditions suggested by each manufacturer.

It should be noted that terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit this specification. The practicable range of the utility model, and the change or adjustment of its relative relationship, without any substantial change in the technical content, shall also be regarded as the practicable scope of the utility model.

Please refer to Fig. 1 to Fig. 4, in order to achieve the above purpose and other related purposes, the utility model provides a coaxial driving device 1, including: a housing support frame 6, a driving motor 5, a composite planet carrier 4, and an NW planetary gear system 2 and differential gear train 3; wherein, the drive motor 5 is installed on the housing support frame 6; the composite planet carrier 4 is rotatably installed on the housing support frame 6; the NW planetary gear train 2 is installed on the housing support frame 6 On the composite planet carrier 4, the NW planetary gear train 2 is provided with an inner cavity of the center of rotation, and the NW planetary gear train 2 is connected to the drive motor 5; the differential gear train 3 is installed on the composite planetary gear train 2 On the frame 4 and located in the center cavity of the gyration, the outer diameter of the track of the differential gear train 3 is greater than the inner diameter of the track of the NW planetary gear train 2; the drive motor 5, the compound planetary carrier 4, the The NW planetary gear train 2 and the differential gear train 3 are arranged coaxially.

Please refer to FIG. 3 , in one embodiment of the present utility model, the differential gear train 3 includes: a differential planetary gear 31 and a side gear 32 , and the differential planetary gear 31 is rotatably mounted on the compound planetary carrier 4 Above, the differential planetary gear 31 meshes with the side gear 32 .

Please refer to Fig. 2 and Fig. 4, in one embodiment of the present utility model, the NW planetary gear train 2 includes: a sun gear 21, a tower type double-toothed planetary gear 22 and an inner ring gear 23, and the sun gear 21 Connected to the output shaft of the driving motor 5 , the tower type double tooth planetary gear 22 meshes with the sun gear 21 , and the inner ring gear 23 meshes with the tower type double tooth planetary gear 22 .

Please refer to Fig. 1 to Fig. 4, the NW planetary gear train 2 is arranged coaxially with the differential gear train 3, the compound planetary carrier 4 and the driving motor 5, and the differential gear train 3 is arranged in the cavity of the center of rotation. The NW planetary gear train 2 includes a sun gear 21 , a tower type double gear planetary gear 22 and an inner ring gear 23 . The sun gear 21 is connected with the motor rotor 52 in a manner of integral rotation. The connection method includes splines, that is, the sun gear is arranged on the motor rotor in the form of splines, and the sun gear is processed on the integral shaft, that is, the sun rotor. The tower type double toothed planetary gear 22 comprises a large planetary gear 221 and an asteroid 222, the number of which is equal to the number of the differential planetary gear 31 of the differential gear train 3, the preferred number is 3, and it is evenly arranged in the circumferential direction. The wheel 221 and the small planetary gear 222 are connected in a manner of integral rotation, the large planetary gear 221 and the sun gear 21 are meshed with each other, and the small planetary wheel 222 is meshed with the ring gear 23, and both sides of the planetary wheel are supported by rolling bearings. On the upper side, the two sides are respectively arranged on the tower type planetary wheel support position 43 and the tower type planetary wheel support position 44. The inner ring gear 23 is arranged on the housing support frame 6 in a fixed connection in the circumferential direction and the axial direction. In order to realize the floating load sharing when meshing with the small planetary gear 222, the ring gear floating mode is adopted, that is, the diameter of the inner ring gear To allow some float. The compound planet carrier 4 is located inside the ring gear 23 .

Please refer to Fig. 1, Fig. 3 and Fig. 4, in one embodiment of the present invention, the differential gear train 3 includes several differential planetary gears 31, and the NW planetary gear train 2 includes several tower-type twin gears Coupled planetary gears 22 , the number of tower type double planetary gears 22 corresponds to the number of differential planetary gears 31 . Correspondingly, the number of the differential planetary gears 31 may be an integer multiple of the number of the tower-type double-toothed planetary gears 22, and the integer is greater than or equal to 1.

Please refer to Fig. 1 to Fig. 4, the differential gear train 3 is arranged coaxially with the NW planetary gear train 2, the compound planetary carrier 4 and the drive motor 5, which is supported on the compound planetary carrier 4 through sliding bearings, and is located in the NW The inner cavity of the center of rotation of the planetary gear train 2 includes differential planetary gears 31, side gears 32 and ball joints 33. The number of differential planetary gears 31 is equal to the number of tower-type double-toothed planetary gears 22, and the preferred number is 3. And in the circumferential direction, it is alternately and equidistantly arranged with the tower type double-toothed planetary gear 22, which is supported on the differential planetary gear support hole 46 and the ball joint 33 of the compound planetary carrier 4 in a relative rotation manner, and the connection method can be a rolling bearing Or a sliding bearing, preferably a sliding bearing, the half shaft gear 32 meshes with all the differential planetary gears 31, the meshing tooth shape is preferably a straight bevel gear, and the power output from the drive motor 5 is output to the wheel end, or the power from the driving motor 5 is output to the wheel end, or The energy feedback value at the wheel end drives the motor 5 . By adopting the design that the number of planetary gears is equal to the number of differential star wheels, the planetary gears of the two can be arranged at equal angular intervals in the circumferential direction to achieve better dynamic balance; at the same time, the planetary gears of the planetary row can be Avoiding the interference of the composite planetary carrier, using the window space of the planetary wheel of the differential to achieve a smaller radial size.

Please refer to Fig. 2 and Fig. 3, in one embodiment of the present utility model, each described tower type double gear planetary gear 22 comprises large planetary gear 221 and small planetary gear 222, and described large planetary gear 221 and described small planetary gear The planetary gears 222 are coaxially connected, the large planetary gear 221 is meshed with the sun gear 21 , and the small planetary gear 222 is meshed with the ring gear 23 . A gap is formed between two adjacent differential planetary wheels 31 , several differential planetary wheels 31 form several gaps, and the small planetary wheels are at least partially located in the corresponding gaps. When the number of the tower type double-toothed planetary gear 22 was equal to the number of the differential planetary gear 31, that is, the number of the small planetary gear was equal to the differential planetary gear 222, the small planetary gear 222 and the differential speed The planetary wheels 31 are alternately arranged at equal intervals.

Please refer to Fig. 5 , in one embodiment of the present utility model, the composite planetary carrier 4 includes a planetary carrier housing 41, and the planetary carrier housing 41 is provided with a first planetary carrier support position 42, a large planetary wheel support position 44, asteroid wheel support position 43, sun gear support position 45 and differential planetary wheel support position 46.

Please refer to Fig. 1, Fig. 3 and Fig. 5, the composite planetary carrier 4 is coaxially arranged on the NW planetary gear train 2, the differential gear train 3 and the driving motor 5, and is supported on the housing support system 6 in a relative rotation manner , the connection method is preferably a rolling bearing, and basically coincides with the NW planetary gear train 2 and the differential gear train 3 in the axial dimension, which includes the planet carrier housing 41, the planet carrier support position 42, the tower planetary gear support Position 43, tower type planetary gear support position 44, sun gear support position 45 and differential planetary gear support position 46, the support form of all support positions is preferably rolling bearing support. The planet carrier housing 41 provides the integration of all support positions, the planet carrier support position 42 and the sun gear support position 45 are coaxially arranged on the NW planetary gear train 2, the differential gear train 3 and the drive motor 5, and the planet carrier support position 42 is arranged with The rolling bearing is connected with the housing support system 6, the sun gear support 45 is connected with the sun gear 21 in a rolling bearing, the number of tower planetary gear support 43 and tower planetary gear 44 is equal to that of the tower double gear planetary gear 22 It is coaxially arranged and supported on both sides of the tower-type double-teeth planetary gear 22 . The number of differential planetary gear support positions 46 is equal to the number of differential planetary gears 31 , providing support for the differential planetary gear 31 .

Please refer to Fig. 1 and Fig. 6, the drive motor 5 is coaxially arranged on the NW planetary gear train 2, the differential gear train 3 and the compound planet carrier 4, which includes a motor stator 51 and a motor rotor 52, and the motor stator 51 is supported by the motor stator The position 65 is set on the shell support system 6 in a coaxial fixed manner, and the connection method is preferably an interference connection. The motor rotor 52 is set on the shell support system in a relative rotation manner through the motor rotor support position 62 and the motor rotor support position 63 6, the support form is preferably a rolling bearing connection.

Please refer to Fig. 6. In one embodiment of the present utility model, the housing support frame 6 includes: a housing on which a second planet carrier support position 61, a first motor rotor support position 62, a second Two motor rotor support positions 63 , ring gear support positions 64 and motor stator support positions 65 . The housing can be composed of 2 to 4 sub-housings, preferably 3 parts.

Comparing Fig. 1 and Fig. 2, it can be seen that the utility model is compared with the existing driving device. Since the NW planetary gear train 2 is adopted, the differential gear train 3 and the composite planet carrier 4 share the axial dimension, and the differential gear train 3 is arranged on the NW planetary gear train. The gear train 2 is in the inner cavity of the center of rotation and is set on the compound planetary carrier 4 at the same time. The compound planetary carrier 4 is set on the shell support system 6, which not only meets the needs of the tower type double-toothed planetary gear 22 and the differential planetary gear 31's revolution around the axis of the coaxial drive device 1 and the support requirements of its own axis rotation can also achieve a smaller axial dimension, which is conducive to achieving higher power density and facilitating the powertrain layout of the vehicle.

Comparing Fig. 1 with Fig. 4, since the number of tower-type double-toothed planetary gears 22 and differential planetary gears 31 are equal, preferably 3, uniform and equidistant arrangement in the circumferential direction can be realized, which greatly reduces the internal rotation of the drive device The amount of dynamic unbalance of parts, based on the known, dynamic unbalance will produce dynamic unbalanced force when rotating, causing additional fatigue and failure to related parts, so it is beneficial to improve the durability and reliability of parts on the power transmission path, and at the same time, based on the known, The vibration generated by the dynamic unbalanced force will cause the NVH problem, so the utility model is beneficial to the improvement of the NVH property.

Since the number of the tower-type double-toothed planetary gears 22 and the differential planetary gears 31 are equal and arranged alternately, the tower-type double-toothed planetary gears 22 can avoid the housing at the differential planetary gear support position 46, thereby achieving a smaller Based on the known, smaller radial size means higher power density, better powertrain layout space, higher ground clearance, better integration space, such as with motor controller or Integration of chargers.

A vehicle, the vehicle is provided with the coaxial drive device.

In the coaxial driving device of the utility model, the differential gear train 3 is located in the rotary center cavity of the NW planetary gear train 2, and the differential gear train 3 is embedded inside the planetary gear train to achieve a smaller axial dimension. The smaller axial dimension has It is beneficial to the layout of the driving half shaft of the whole vehicle and the layout of the front wheel steering gear. At the same time, since the outer diameter of the running track of the differential gear train 3 is larger than the inner diameter of the running track of the NW planetary gear train 2, the radial size of the entire device becomes smaller, and the smaller radial size can bring a higher ground clearance. Freer Z-direction layout space, more convenient to integrate motor controller. Therefore, the utility model effectively overcomes some practical problems in the prior art and thus has high utilization value and use significance.

The above-mentioned embodiments only illustrate the principles and effects of the present utility model, but are not intended to limit the present utility model. Anyone familiar with this technology can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the utility model should still be covered by the claims of the utility model.

Claims (10)

1. A coaxial drive, comprising:

a housing support frame;

the driving motor is arranged on the shell supporting frame;

the composite planet carrier is rotatably arranged on the shell support frame;

the NW planetary gear train is arranged on the compound planet carrier, a rotation center inner cavity is arranged in the NW planetary gear train, and the NW planetary gear train is connected with the driving motor;

the differential gear train is arranged on the composite planet carrier and positioned in the rotary central cavity, and the outer diameter of the running track of the differential gear train is larger than the inner diameter of the running track of the NW planetary gear train;

wherein the drive motor, the compound planet carrier, the NW planet row gear train and the differential gear train are coaxially arranged.

2. The coaxial drive of claim 1, wherein the differential gear train comprises: differential planet wheel and side gear, differential planet wheel rotate install in on the compound planet carrier, differential planet wheel with side gear meshes.

3. The coaxial drive of claim 2, wherein the NW planetary gear train comprises: the sun gear is connected with an output shaft of the driving motor, the tower type duplex gear planetary gear is meshed with the sun gear, and the inner gear ring is meshed with the tower type duplex gear planetary gear.

4. The coaxial drive of claim 3, wherein the ring gear is mounted on the housing support bracket and the compound planet carrier is located inside the ring gear.

5. The coaxial drive of claim 3, wherein the differential gear train comprises a number of differential planets, the NW planetary gear train comprises a number of tower-type double-tooth planets, and the number of tower-type double-tooth planets corresponds to the number of differential planets.

6. The coaxial drive of claim 5, wherein the number of tower-type double-tooth planet wheels is equal to the number of differential planet wheels.

7. The coaxial driving device as recited in claim 6, wherein each of the tower-type dual-tooth planetary gears comprises a large planetary gear and a small planetary gear, the large planetary gear is coaxially connected with the small planetary gear, the large planetary gear is meshed with the sun gear, the small planetary gear is meshed with the inner gear ring, and the small planetary gear and the differential planetary gear are alternately arranged at equal intervals.

8. The coaxial drive of claim 1, wherein the compound planet carrier comprises a planet carrier housing having a first planet carrier support location, a large planet support location, a small planet support location, a sun support location, and a differential planet support location disposed thereon.

9. The coaxial drive of claim 1, wherein the housing support bracket comprises: the motor comprises a shell, wherein a second planet carrier supporting position, a first motor rotor supporting position, a second motor rotor supporting position, an inner gear ring supporting position and a motor stator supporting position are arranged on the shell.

10. A vehicle, characterized in that the vehicle is provided with a coaxial drive according to any one of claims 1-9.

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