Coaxial electric drive axle structure and vehicle

Abstract

The utility model discloses a coaxial electric drive axle structure and a vehicle. The coaxial electric drive axle structure comprises an electric drive axle housing, a differential mechanism, two half shafts and at least one group of driving components, wherein the differential mechanism, the two half shafts and the at least one group of driving components are positioned in the electric drive axle housing; the driving assembly comprises a motor arranged on the outer side of the half shaft in a sleeving mode, a gear shifting planet row, a speed reducer and a gear shifting sliding sleeve. In the gear shifting planet row, a first sun gear is connected with an output shaft of the motor, and a first gear ring can rotate around a half shaft relative to the electric drive axle housing; the gear shifting sliding sleeve is located on the inner side of the gear shifting planet row and the speed reducer, in the gear shifting sliding sleeve, the first sleeve section and the second sleeve section are relatively static in the extending direction of the half shaft, the second sleeve section can rotate around the half shaft, and the second sleeve section is connected with the differential mechanism shell through the speed reducer. The gear shifting sliding sleeve can move in the extending direction of the half shaft so as to switch the connection state with the electric drive axle housing, the first planet carrier and the first gear ring. According to the coaxial electric drive axle, the number of parts can be reduced, the arrangement difficulty is lowered, the system weight is reduced, and the power density is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to drive axle structure technical field, especially a coaxial electric drive axle structure and vehicle. BACKGROUND

[0002] To cope with carbon emission problem, pure electric passenger car has obtained the extensive application, but in the commercial vehicle field, especially heavy truck field, by the limit of mileage, the development is slow. Among them, electric drive axle as high integration degree whole vehicle scheme has become the research mainstream.

[0003] In the prior art, the heavy truck electric drive axle structure adopts the layout form of parallel shaft, two motors are arranged on the front and rear sides of the electric drive axle, greatly occupies the space of front and rear, and the power density is low by parallel shaft cylindrical gear transmission. Compared with the layout of parallel shaft, the integration degree of coaxial electric drive axle is further improved, the volume is further reduced, more space is released for the whole vehicle, thereby the number of batteries can be increased, and the system weight is reduced, so that the driving mileage is improved.

[0004] The heavy truck electric drive axle requires a large side torque, so a double-motor layout form is usually adopted, and the coaxial electric drive axle requires a planetary gear train. The existing heavy truck coaxial electric drive axle is mostly a symmetrical structure, in order to realize uninterrupted power shifting, the two motors and the gearbox are configured in the same way, and independent shifting mechanisms are adopted. For example, in the multi-gear coaxial electric drive axle structure provided by the patent CN218400206U, each motor is designed with a two-gear gearbox, and finally outputs to a differential. The two gearboxes each have three planetary gears, and the torque is improved through a large speed ratio to meet the performance requirements of heavy trucks. The axial size of this scheme is large, which is difficult to arrange on the whole vehicle, and the implementability is poor. At the same time, the weight is large, and the power density is low. SUMMARY

[0005] The utility model provides a kind of coaxial electric drive axle structure and vehicle, above-mentioned coaxial electric drive axle structure can reduce the quantity of parts and components, reduce arrangement difficulty, improve system reliability, reduce system cost and reduce system weight, improve power density.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] A coaxial electric drive axle structure includes an electric drive axle housing, a differential, two half shafts and at least one drive assembly located within the electric drive axle housing.

[0008] The two half shafts are located on both sides of the differential, and the first end of the half shaft is connected to the differential gear of the differential.

[0009] The drive assembly includes a motor, a shifting planetary gear, a reducer and a shifting sleeve that are arranged on the outside of the same half shaft.

[0010] The shift planetary gear set comprises a first sun gear, a first planet carrier and a first ring gear, the first sun gear is connected with the output shaft of the motor, and the first ring gear is rotatable relative to the electric drive axle housing about the half shaft;

[0011] The shift sleeve is located inside the shift planetary gear set and the reducer, the shift sleeve has a first sleeve segment and a second sleeve segment, the first sleeve segment and the second sleeve segment are positionally stationary along the extension direction of the half shaft, the second sleeve segment is rotatable relative to the first sleeve segment about the half shaft, and the second sleeve segment is connected with the differential housing through the reducer;

[0012] The shift sleeve is movable along the extension direction of the half shaft to switch the connection state of the first sleeve segment and the second sleeve segment with the electric drive axle housing, the first planet carrier and the first ring gear, so as to realize gear shifting.

[0013] Optionally, the shift sleeve has a first gear position, a second gear position and a third gear position along the extension direction of the half shaft;

[0014] When the shift sleeve is in the first gear position, the first sleeve segment is connected with the inside of the electric drive axle housing and the first ring gear, and the second sleeve segment is connected with the first planet carrier;

[0015] When the shift sleeve is in the second gear position, the first sleeve segment is connected with the inside of the electric drive axle housing and the first planet carrier, and the second sleeve segment is connected with the first ring gear;

[0016] When the shift sleeve is in the third gear position, the first sleeve segment is connected with the first planet carrier and the first ring gear, and the second sleeve segment is connected with the first planet carrier.

[0017] Optionally, the first sleeve segment and the second sleeve segment are arranged along a first direction, and the first direction is a direction in which the second end of the half shaft points to the first end;

[0018] The outside of the first sleeve segment has a first external spline and a second external spline arranged in sequence and at intervals along the first direction, and the outside of the second sleeve segment has a third external spline, a fourth external spline and a fifth external spline arranged in sequence and at intervals along the first direction;

[0019] The inner side of the electric drive axle housing has a first inner spline, the inner side of the first planet carrier has a second inner spline and a third inner spline, the inner side of the first ring gear has a fourth inner spline and a fifth inner spline, the reducer has a sixth inner spline, and the first inner spline, the second inner spline, the fourth inner spline, the fifth inner spline, the third inner spline and the sixth inner spline are sequentially and spaced arranged along the first direction;

[0020] When the shift sleeve is in the first gear position, the first outer spline is engaged with the first inner spline, the second outer spline is engaged with the fourth inner spline, the fourth outer spline is engaged with the third inner spline, and the fifth outer spline is engaged with the sixth inner spline.

[0021] When the shift sleeve is in the second gear position, the first outer spline is engaged with the first inner spline and the second inner spline, the third outer spline is engaged with the fifth inner spline, and the fifth outer spline is engaged with the sixth inner spline.

[0022] When the shift sleeve is in the third gear position, the first outer spline is engaged with the second inner spline, and the fifth outer spline is engaged with the sixth inner spline.

[0023] Optionally, the first ring gear is connected to the electric drive axle housing through a bearing.

[0024] Optionally, the motor is sleeved outside the planet gears of the shift planetary gear set.

[0025] Optionally, the reducer comprises a first reduction planetary gear set sleeved outside the half shafts;

[0026] The first reduction planetary gear set comprises a second sun gear, a second planet carrier and a second ring gear.

[0027] The second sun gear is connected to the second sleeve segment, the second planet carrier is connected to the differential housing, and the second ring gear is fixedly connected to the electric drive axle housing.

[0028] Optionally, the reducer further comprises a second reduction planetary gear set sleeved outside the half shafts, and the first reduction planetary gear set is connected to the differential housing through the second reduction planetary gear set.

[0029] The second reduction planetary gear set comprises a third sun gear, a third planet carrier and a third ring gear, the third sun gear is connected to the second planet carrier, the third planet carrier is connected to the differential housing, and the third ring gear is fixedly connected to the electric drive axle housing.

[0030] Optionally, it further comprises two wheel-side planetary gear sets.

[0031] Two wheel-side planetary gears correspond to two half shafts, and the second end of the half shaft is connected to the wheel through the corresponding wheel-side planetary gear;

[0032] The wheel-side planetary gear includes a fourth sun gear, a fourth planet carrier and a fourth ring gear, the fourth sun gear is connected to the second end of the half shaft, the fourth planet carrier is used for connecting to the wheel, and the fourth ring gear is fixedly connected to the electric drive axle housing.

[0033] Optionally, two groups of driving assemblies are included, and the two groups of driving assemblies correspond to two half shafts, and the driving assembly is sleeved outside the corresponding half shaft.

[0034] The utility model also provides a vehicle comprising any one of the coaxial electric drive axle structures provided in the above technical solutions.

[0035] The utility model provides a kind of coaxial electric drive axle structure and vehicle, in the coaxial electric drive axle structure, gear shifting execution mechanism connected between motor and differential only includes shift planetary gear and speed reducer, the first ring gear of shift planetary gear can rotate relative to electric drive axle housing around half shaft, shift sleeve is divided into first sleeve section and second sleeve section, by the movement of shift sleeve along the extension direction of half shaft, the connection state of shift sleeve and electric drive axle housing, the first planet carrier and the first ring gear of shift planetary gear can be switched, to further realize the switching of gear position.The coaxial electric drive axle structure described above, adopt coaxial architecture form, can reduce external dimension, improve system integration and vehicle utilization rate, and, only have shift planetary gear and speed reducer in gear shifting execution mechanism, can reduce the use amount of planetary gear, reduce the number of parts, can reduce arrangement difficulty, improve system reliability and reduce system cost, and reduce system weight, improve power density. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is a structure schematic view of the coaxial electric drive axle structure provided by the utility model embodiment;

[0037] Figure 2 It is another structure schematic view of the coaxial electric drive axle structure provided by the utility model embodiment;

[0038] Figure 3 It is a state schematic view of the driving assembly provided by the utility model embodiment;

[0039] Figure 4 It is another state schematic view of the driving assembly provided by the utility model embodiment;

[0040] Figure 5 It is another state schematic view of the driving assembly provided by the utility model embodiment;

[0041] Figure 6Another state diagram of the driving assembly is provided for the embodiment of the utility model.

[0042] Figure 7 Another state diagram of the driving assembly is provided for the embodiment of the utility model.

[0043] Figure 8 Another structure diagram of the coaxial electric drive bridge structure is provided for the embodiment of the utility model.

[0044] Icon:

[0045] 1 - differential; 2 - half shaft; 3 - motor; 31 - output shaft; 4 - gear shifting planetary gear set; 41 - first sun gear; 42 - first planet carrier; 43 - first ring gear; 431 - ring gear transmission shaft; 5 - speed reducer; 51 - first speed reduction planetary gear set; 52 - second speed reduction planetary gear set; 6 - gear shifting sleeve; 61 - first sleeve segment; 62 - second sleeve segment; 7 - grounding shaft; 8 - wheel edge planetary gear set. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the utility model will be apparently and completely described in combination with the drawings in the embodiments of the utility model. Apparently, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the person skilled in the art without creative labor fall within the protection scope of the utility model.

[0047] Please refer to Figure 1 , Figure 2 and Figure 3 , the utility model provides a coaxial electric drive bridge structure, including electric drive bridge shell and the differential 1, two half shafts 2 and at least a group of driving assembly in electric drive bridge shell,

[0048] Two half shafts 2 are located at the two sides of differential 1, and the first end of half shaft 2 is connected with the differential gear of differential 1.

[0049] Driving assembly includes the motor 3, gear shifting planetary gear set 4, speed reducer 5 and gear shifting sleeve 6 of setting in the outside of same half shaft 2,

[0050] Gear shifting planetary gear set 4 includes first sun gear 41, first planet carrier 42 and first ring gear 43, first sun gear 41 is connected with the output shaft 31 of motor 3, and first ring gear 43 can rotate around half shaft 2 relative to electric drive bridge shell.

[0051] The shift sleeve 6 is located on the inner side of the shift planetary gear set 4 and the reducer 5, and the shift sleeve 6 has a first sleeve segment 61 and a second sleeve segment 62, the first sleeve segment 61 is positionally stationary relative to the second sleeve segment 62 along the extension direction of the half shaft 2, and the second sleeve segment 62 is rotatable relative to the first sleeve segment 61 about the half shaft 2, and the second sleeve segment 62 is connected with the differential 1 housing through the reducer 5;

[0052] The shift sleeve 6 is movable along the extension direction of the half shaft 2 to switch the connection state of the first sleeve segment 61 and the second sleeve segment 62 with the electric drive axle housing, the first carrier 42 and the first ring gear 43, so as to realize gear shifting.

[0053] In the coaxial electric drive axle structure, the shift execution mechanism connected between the motor 3 and the differential 1 only includes the shift planetary gear set 4 and the reducer 5, the first ring gear 43 of the shift planetary gear set 4 is rotatable relative to the electric drive axle housing about the half shaft 2, the shift sleeve 6 is divided into the first sleeve segment 61 and the second sleeve segment 62, and the connection state of the shift sleeve 6 with the electric drive axle housing, the first carrier 42 and the first ring gear 43 of the shift planetary gear set 4 can be switched through the movement of the shift sleeve 6 along the extension direction of the half shaft 2, and then the gear shifting is realized. In the coaxial electric drive axle structure, the coaxial architecture form is adopted, the overall size can be reduced, the system integration and the vehicle utilization rate can be improved, and in the shift execution mechanism, only the shift planetary gear set 4 and the reducer 5 are provided, the use amount of the planetary gear set can be reduced, the number of parts can be reduced, the arrangement difficulty can be reduced, the system reliability can be improved, the system cost can be reduced, the system weight can be reduced, and the power density can be improved.

[0054] Specifically, in the coaxial electric drive axle, the motor 3 outputs power to the first sun gear 41 of the shift planetary gear set 4, the first carrier 42 or the first ring gear 43 can be switched through the movement of the shift sleeve 6, the torque is transmitted to the differential 1 housing through the reducer 5, and the differential 1 distributes the torque to the wheels at both ends of the electric drive axle through the two half shafts 2.

[0055] Specifically, in the coaxial electric drive axle structure, as shown in Figure 1 , two groups of driving assemblies can be included, the two groups of driving assemblies are correspondingly arranged with the two half shafts 2, and the driving assembly can be sleeved outside the corresponding half shaft 2. Alternatively, as shown in Figure 2 , the coaxial electric drive axle structure includes one group of driving assemblies, and the driving assembly is sleeved outside one of the half shafts 2, for example, Figure 2 , the driving assembly is sleeved outside the left half shaft 2.

[0056] Specifically, the movement of the shift sleeve 6 along the extension direction of the half shaft 2 can have a first gear position, a second gear position and a third gear position; accordingly, the vehicle speed can be adjusted by 3 gears.

[0057] When the shift sleeve 6 is in the first gear position, the first sleeve segment 61 is connected with the inner side of the electric drive axle housing and the first ring gear 43, and the second sleeve segment 62 is connected with the first planet carrier 42, which corresponds to the first gear of the vehicle speed; at this time, the first ring gear 43 is fixedly connected with the electric drive axle housing, the first planet carrier 42 is fixedly connected with the reducer 5, the output shaft 31 of the motor 3 drives the first sun gear 41 to rotate, the first sun gear 41 meshes with the planet gears on the first planet carrier 42, the first ring gear 43 does not rotate, and then the first planet carrier 42 rotates and is output through the second sleeve segment 62;

[0058] When the shift sleeve 6 is in the second gear position, the first sleeve segment 61 is connected with the inner side of the electric drive axle housing and the first planet carrier 42, and the second sleeve segment 62 is connected with the first ring gear 43, which corresponds to the second gear of the vehicle speed; at this time, the first planet carrier 42 is fixedly connected with the electric drive axle housing, the first ring gear 43 is fixedly connected with the reducer 5, the output shaft 31 of the motor 3 drives the first sun gear 41 to rotate, the first sun gear 41 drives the planet gears on the first planet carrier 42 to rotate, the first planet carrier 42 does not rotate, and then the planet gears drive the first ring gear 43 to rotate, and the first ring gear 43 is output through the second sleeve segment 62;

[0059] When the shift sleeve 6 is in the third gear position, the first sleeve segment 61 is connected with the first planet carrier 42 and the first ring gear 43, and the second sleeve segment 62 is connected with the first planet carrier 42, which corresponds to the third gear of the vehicle speed; at this time, the first planet carrier 42 is fixedly connected with the first ring gear 43, the first planet carrier 42 is fixedly connected with the reducer 5, the output shaft 31 of the motor 3 drives the first sun gear 41 to rotate, the first sun gear 41 drives the planet gears on the first planet carrier 42 to rotate, the rotation of the planet gears drives the first planet carrier 42 and the first ring gear 43 to rotate synchronously, and the first planet carrier 42 is output through the second sleeve segment 62.

[0060] In the coaxial electric drive axle, the shift planetary gear set 4 can realize the switching of the third gear of the vehicle speed by moving the shift sleeve 6 along the extension direction of the half shaft 2. The three gears can more easily match the optimal gearbox speed ratio, which is beneficial to improve the system efficiency and reduce the power consumption.

[0061] In the embodiment of the utility model, the first sleeve segment 61 and the second sleeve segment 62 are arranged along the first direction, and the first direction is the direction in which the second end of the half shaft 2 points to the first end;

[0062] The outer side of the first sleeve segment 61 has the first external spline and the second external spline which are arranged in sequence and at intervals along the first direction, and the outer side of the second sleeve segment 62 has the third external spline, the fourth external spline and the fifth external spline which are arranged in sequence and at intervals along the first direction;

[0063] The inner side of the electric drive axle housing has a first inner spline, the inner side of the first planet carrier 42 has a second inner spline and a third inner spline, the inner side of the first ring gear 43 has a fourth inner spline and a fifth inner spline, the reducer 5 has a sixth inner spline, and the first inner spline, the second inner spline, the fourth inner spline, the fifth inner spline, the third inner spline and the sixth inner spline are sequentially and spaced apart in a first direction.

[0064] Specifically, when the shift sleeve 6 is in the first gear position, the first outer spline is engaged with the first inner spline, the second outer spline is engaged with the fourth inner spline, the fourth outer spline is engaged with the third inner spline, and the fifth outer spline is engaged with the sixth inner spline, as shown in FIG. 2, so that the first sleeve segment 61 is connected with the inner side of the electric drive axle housing and the first ring gear 43, and the second sleeve segment 62 is connected with the first planet carrier 42. Figure 3

[0065] When the shift sleeve 6 is between the first gear position and the second gear position, the inner splines on the first ring gear 43 and the first planet carrier 42 are not engaged with the outer splines on the shift sleeve 6, as shown in FIG. 3, so that the vehicle is in a neutral state between the first gear and the second gear. Figure 4

[0066] When the shift sleeve 6 is in the second gear position, the first outer spline is engaged with the first inner spline and the second inner spline, the third outer spline is engaged with the fifth inner spline, and the fifth outer spline is engaged with the sixth inner spline, as shown in FIG. 4, so that the first sleeve segment 61 is connected with the inner side of the electric drive axle housing and the first planet carrier 42, and the second sleeve segment 62 is connected with the first ring gear 43. Figure 5

[0067] When the shift sleeve 6 is between the second gear position and the third gear position, the inner splines on the first ring gear 43 and the first planet carrier 42 are not engaged with the outer splines on the shift sleeve 6, as shown in FIG. 5, so that the vehicle is in a neutral state between the second gear and the third gear. Figure 6

[0068] When the shift sleeve 6 is in the third gear position, the first outer spline is engaged with the second inner spline, and the fifth outer spline is engaged with the sixth inner spline, as shown in FIG. 6, so that the first sleeve segment 61 is connected with the first planet carrier 42 and the first ring gear 43, and the second sleeve segment 62 is connected with the first planet carrier 42. Figure 7

[0069] In the coaxial electric drive axle structure described above, the electric drive axle housing, the first planet carrier 42 and the first ring gear 43 all have inner splines, and the shift sleeve 6 has a plurality of outer splines that can match the inner splines. When the shift sleeve 6 moves in the extension direction of the half shaft 2, the outer splines can be matched with different inner splines to switch the connection state of the shift sleeve 6 with the electric drive axle housing, the first planet carrier 42 and the first ring gear 43, thereby realizing gear shifting. The structure is simple and easy to implement. ​​​​​

[0070] Specifically, as shown in Figure 3 The first ring gear 43 can include a ring gear transmission shaft 431, which can be sleeved on the outside of the shift sleeve 6, and the ring gear transmission shaft 431 can be provided with a third internal spline and a fourth internal spline.

[0071] Specifically, as shown in Figure 3 The inside of the electric drive axle housing can be provided with a grounding shaft 7, which can be sleeved on the outside of the shift sleeve 6, and the inside of the grounding shaft 7 can be provided with a first internal spline.

[0072] In the embodiment of the utility model, the first ring gear 43 and the electric drive axle housing can be connected through a bearing, realizing that the first ring gear 43 can rotate around the half shaft 2 relative to the electric ring axle housing.

[0073] In the embodiment of the utility model, as shown in Figure 3 The motor 3 can be sleeved on the outside of the planetary gear of the shift planetary gear set 4, that is, the stator, rotor and output shaft 31 of the motor 3 are sleeved on the outside of the planetary gear of the shift planetary gear set 4, which can make the structure of the drive assembly more compact, reduce the size of the electric drive axle assembly in the axial direction, reduce the arrangement difficulty and improve the power density.

[0074] In the embodiment of the utility model, as shown in Figure 1 The reducer 5 can include a first reduction planetary gear set 51 sleeved on the outside of the half shaft 2; the first reduction planetary gear set 51 includes a second sun gear, a second planet carrier and a second ring gear; the second sun gear is connected with the second sleeve segment 62, the second planet carrier is connected with the differential 1 housing, and the second ring gear is fixedly connected with the electric drive axle housing, realizing the connection of the reducer 5, the second sleeve segment 62 and the differential 1.

[0075] In the coaxial electric drive axle structure, the shift execution mechanism connected between the motor 3 and the differential 1 only has two planetary gear sets, compared with the prior art, the number of parts is reduced, the size and weight of the intermediate drive assembly are reduced, and the power density is improved.

[0076] Furthermore, the second sun gear can have a sixth internal spline, and the sixth internal spline can be engaged with a fifth external spline on the second sleeve segment 62, realizing the connection of the reducer 5 and the second sleeve segment 62.

[0077] In the embodiment of the utility model, as shown in Figure 8 The reducer 5 can further include a second reduction planetary gear set 52 sleeved on the outside of the half shaft 2, and the first reduction planetary gear set 51 is connected with the differential 1 housing through the second reduction planetary gear set 52, as shown in Figure 8As shown; the second reduction planetary gear set 52 includes a third sun gear, a third planet carrier and a third ring gear. The third sun gear is connected to the second planet carrier, the third planet carrier is connected to the differential 1 housing, and the third ring gear is fixedly connected to the electric drive axle housing.

[0078] Optionally, the coaxial electric drive axle structure may also include two wheel-side planetary gear sets, such as... Figure 1 and Figure 2 As shown; the two wheel-side planetary gear sets 8 can correspond one-to-one with the two half-shafts 2, and the second end of the half-shaft 2 is connected to the wheel through the corresponding wheel-side planetary gear set 8; wherein, the wheel-side planetary gear set 8 includes a fourth sun gear, a fourth planet carrier and a fourth gear ring, the fourth sun gear is connected to the second end of the half-shaft 2, the fourth planet carrier is used to connect to the wheel, and the fourth gear ring is fixedly connected to the electric drive axle housing.

[0079] For example, such as Figure 1 As shown, the second ends of the two half-shafts 2 can be connected to the wheels on the left and right sides of the coaxial electric drive axle structure through two wheel-side planetary gear sets 8.

[0080] In the aforementioned coaxial electric drive axle structure, the differential 1 distributes torque to the fourth sun gear of the wheel-side planetary gear set 8 at both ends of the electric drive axle. The fourth ring gear of the wheel-side planetary gear set 8 is fixed, and the fourth planet carrier outputs torque, enabling the transmission of torque to the wheels. Placing the wheel-side planetary gear set 8, which is used for deceleration, next to the wheels reduces the number of parts in the drive assembly in the middle of the electric drive axle structure, reduces the axial dimension of the drive assembly, and makes the structure more compact.

[0081] This utility model also provides a vehicle, including any of the coaxial electric drive axle structures provided in the above technical solutions.

[0082] In this embodiment of the utility model, such as Figure 1 As shown, the coaxial electric drive bridge can include two sets of drive components, i.e., a dual-motor layout for driving; or it can include one set of drive components, such as... Figure 2 and Figure 8 As shown, a single-motor layout is used for driving.

[0083] Specifically, such as Figure 1 As shown, when the coaxial electric drive bridge adopts a dual-motor layout, it can include motor A and motor B; Figure 1 The specific working process of a vehicle with a coaxial electric drive axle structure can be summarized as follows:

[0084] After power is applied and the vehicle is started, motors A and B can be simultaneously engaged in first gear (the shift sleeve in the two drive components is in the first gear position), and the vehicle starts moving.

[0085] When the vehicle speed reaches the 2-gear shifting speed, motor A is engaged to neutral (in the drive assembly where motor A is located, the shift sleeve is between the first gear position and the second gear position), and is regulated to the 2-gear motor speed, and then is engaged to 2-gear (in the drive assembly where motor A is located, the shift sleeve is in the second gear position).

[0086] When the vehicle speed reaches the 3-gear shifting speed, motor A is engaged to neutral (in the drive assembly where motor A is located, the shift sleeve is between the second gear position and the third gear position), and is regulated to the 3-gear motor speed, and then is engaged to 3-gear (in the drive assembly where motor A is located, the shift sleeve is in the third gear position).

[0087] When the vehicle is in the cruise control state, and the motor torque is lower than threshold 1, motor A and motor B are simultaneously engaged to neutral, the vehicle is in neutral sliding, and the electric consumption is reduced.

[0088] When the brake pedal is depressed, no matter what gear the motor is in, the two motors are simultaneously engaged to 3-gear, and kinetic energy recovery is performed.

[0089] In the embodiment of the utility model, when the coaxial electric drive bridge adopts the double-motor layout, the double motors are shifted in turn, and the functions of uninterrupted power, neutral sliding, brake kinetic energy recovery, and reduced electric consumption can be realized.

[0090] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the utility model without departing from the spirit and scope of the utility model. Thus, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and the equivalent technology, the utility model also intends to include these modifications and variations.

Claims

1. A coaxial electrically driven axle structure, characterized by The electric drive axle housing and the differential, two half shafts and at least one set of drive components located inside the electric drive axle housing; The two half shafts are located on both sides of the differential, and the first end of the half shaft is connected with the differential gear of the differential; The drive assembly includes a motor, a shift planetary gear set, a reducer and a shift sleeve arranged outside the same half shaft; The shift planetary gear set includes a first sun gear, a first planet carrier and a first ring gear, the first sun gear is connected with the output shaft of the motor, and the first ring gear is rotatable relative to the electric drive axle housing around the half shaft; The shift sleeve is located inside the shift planetary gear set and the reducer, the shift sleeve has a first sleeve segment and a second sleeve segment, the first sleeve segment and the second sleeve segment are positionally stationary along the extension direction of the half shaft, the second sleeve segment is rotatable relative to the first sleeve segment around the half shaft, and the second sleeve segment is connected with the differential housing through the reducer; The shift sleeve is movable along the extension direction of the half shaft to switch the connection state of the first sleeve segment and the second sleeve segment with the electric drive axle housing, the first planet carrier and the first ring gear, so as to realize gear shifting.

2. The coaxial electrically driven axle structure of claim 1, wherein, The shift sleeve has a first gear position, a second gear position and a third gear position along the extension direction of the half shaft; When the shift sleeve is in the first gear position, the first sleeve segment is connected with the inner side of the electric drive axle housing and the first ring gear, and the second sleeve segment is connected with the first planet carrier; When the shift sleeve is in the second gear position, the first sleeve segment is connected with the inner side of the electric drive axle housing and the first planet carrier, and the second sleeve segment is connected with the first ring gear; When the shift sleeve is in the third gear position, the first sleeve segment is connected with the first planet carrier and the first ring gear, and the second sleeve segment is connected with the first planet carrier.

3. The coaxial electrically driven axle structure of claim 2, wherein, The first sleeve segment and the second sleeve segment are arranged along a first direction, and the first direction is a direction in which the second end of the half shaft points to the first end; The outer side of the first sleeve segment has a first outer spline and a second outer spline arranged in sequence and spaced apart along the first direction, and the outer side of the second sleeve segment has a third outer spline, a fourth outer spline and a fifth outer spline arranged in sequence and spaced apart along the first direction; The inner side of the electric drive axle housing has a first inner spline, the inner side of the first planet carrier has a second inner spline and a third inner spline, the inner side of the first ring gear has a fourth inner spline and a fifth inner spline, and the reducer has a sixth inner spline, and the first inner spline, the second inner spline, the fourth inner spline, the fifth inner spline, the third inner spline and the sixth inner spline are arranged in sequence and spaced apart along the first direction; When the shift sleeve is in the first gear position, the first outer spline is engaged with the first inner spline, the second outer spline is engaged with the fourth inner spline, the fourth outer spline is engaged with the third inner spline, and the fifth outer spline is engaged with the sixth inner spline; When the shift sleeve is in the second gear position, the first outer spline is engaged with the first and second inner splines, the third outer spline is engaged with the fifth inner spline, and the fifth outer spline is engaged with the sixth inner spline. When the shift sleeve is in the third gear position, the first outer spline is engaged with the second inner spline, and the fifth outer spline is engaged with the sixth inner spline.

4. The coaxial electrically driven axle structure of claim 1, wherein, The gear ring is connected to the electric drive axle housing through a bearing.

5. The coaxial electrically driven axle structure of claim 1, wherein, The motor is sleeved outside the planet gears of the shift planetary gear set.

6. The coaxial electrically driven axle structure of claim 1, wherein, The speed reducer comprises a first speed reduction planetary gear set sleeved outside the half shafts. The first speed reduction planetary gear set comprises a second sun gear, a second planet carrier, and a second ring gear. The second sun gear is connected to the second sleeve segment, the second planet carrier is connected to the differential housing, and the second ring gear is fixedly connected to the electric drive axle housing.

7. The coaxial electrically driven axle structure of claim 6, wherein, The speed reducer further comprises a second speed reduction planetary gear set sleeved outside the half shafts, and the first speed reduction planetary gear set is connected to the differential housing through the second speed reduction planetary gear set. The second speed reduction planetary gear set comprises a third sun gear, a third planet carrier, and a third ring gear.

8. The coaxial electrically driven axle structure according to any one of claims 1-6, characterized in that, The third sun gear is connected to the second planet carrier, the third planet carrier is connected to the differential housing, and the third ring gear is fixedly connected to the electric drive axle housing. Two wheel-side planetary gear sets are further included. The two wheel-side planetary gear sets correspond to the two half shafts one-to-one, and the second ends of the half shafts are connected to the wheels through the corresponding wheel-side planetary gear sets.

9. The coaxial electrically driven axle structure of claim 8, wherein, The wheel-side planetary gear set comprises a fourth sun gear, a fourth planet carrier, and a fourth ring gear.

10. A vehicle characterized by comprising: The fourth sun gear is connected to the second end of the half shaft, the fourth planet carrier is used for connecting to the wheel, and the fourth ring gear is fixedly connected to the electric drive axle housing. Two groups of drive assemblies are included, and the two groups of drive assemblies correspond to the two half shafts one-to-one. The coaxial electric drive axle structure as claimed in any one of claims 1-9 is included.

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