Synchronizer-free double-speed hub integrated type electric driving wheel set and vehicle comprising same

Abstract

The utility model discloses a synchronizer-free double-speed hub integrated type electric driving wheel set and a vehicle comprising the same. The electric driving wheel set comprises a front end shell, a middle section shell, a rear end shell, a driving motor, a parallel shaft speed reducing mechanism, a planetary gear train speed reducing mechanism, a gear shifting driving mechanism, a transition flange plate, a suspension upper swing arm support, a suspension lower swing arm support, a braking system and a rim. The power system, the transmission system and the braking system are arranged in the hub, the high-speed driving motor and the gear shifting motor are arranged on the same side and connected with the front end shell at the same time, the high-speed driving motor and the gear shifting motor coincide in the axial direction, the space utilization rate of the electric driving wheel set in the axial direction is increased, and the overall structure is more compact. By means of the structure, the problems of complex design and machining difficulty of a gear shifting synchronizer in a traditional gear shifting mechanism are greatly solved, and the gear shifting reliability is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric drive wheel group, concretely to a kind of double-speed wheel hub integrated electric drive wheel group without synchronizer and vehicle comprising the wheel group. BACKGROUND

[0002] New energy vehicles are mainly driven by electricity, and the driving mode is mainly divided into central driving and distributed driving. The distributed driving mode integrates motor, reducer mechanism and hub into one and places them in the wheel, discards the clutch, transmission system and mechanical differential in the traditional central driving system, simplifies the mechanical transmission structure and reduces the vehicle self weight. In addition, distributed driving occupies less space, and each wheel is driven by an independent motor, making distributed driving more flexible.

[0003] The prior art "a two-gear wheel hub integrated electric drive wheel group and vehicle comprising the electric drive wheel group" (publication number: CN 116512893 A) embeds power system, transmission system and brake system in the hub, and increases the compactness of the structure in the axial direction by arranging the gear shifting drive system and power transmission system coaxially. The engagement sleeve is arranged at the center shaft of the first outer planet carrier, and the radial and axial dimensions of the gear shifting engagement sleeve are small, making the structure more compact and facilitating the arrangement of other components. The invention selects disc brake, and arranges the brake caliper in the radial direction of the wheel rim to fully utilize the radial dimension space of the structure. However, in this structure, the middle shell is a middle shell I and a middle shell II connected to each other, and the structural strength needs to be further improved. In addition, the gear shifting drive mechanism is arranged between the middle shell II and the rim, which on the one hand prolongs the axial length of the electric drive wheel, and on the other hand, the use of conical gear structure drive cannot avoid the problems of low transmission efficiency. UTILITY MODEL CONTENTS

[0004] In order to overcome the shortcomings of the prior art, the utility model provides a double-speed wheel hub integrated electric drive wheel group without synchronizer and vehicle comprising the electric drive wheel group, and the technical scheme of the utility model is as follows:

[0005] As a first aspect of the utility model, it provides a double-speed wheel hub integrated electric drive wheel group without synchronizer, which comprises a front end shell, a middle shell, a rear end shell, a drive motor, a gear shifting drive mechanism, a parallel shaft reduction mechanism, a planetary gear train reduction mechanism, a transition flange plate and a rim connected in sequence.

[0006] The driving motor and the front end shell are located outside the rim; one end of the middle section shell is connected with the front end shell, and the other end penetrates the rim and is connected with the rear end shell; toe openings are arranged at the connection positions of adjacent two shells; the output shaft of the driving motor is connected with the input shaft of the parallel shaft reduction mechanism, and the output power of the driving motor is transmitted to the wheel in sequence through the parallel shaft reduction mechanism, the planetary gear train reduction mechanism, the transition flange and the rim.

[0007] Further, the parallel shaft reduction mechanism comprises a high-speed gear shaft, an intermediate gear shaft, a spline hub, a high-speed gear from driven gear and a low-speed gear from driven gear, the high-speed gear shaft is connected with the output shaft of the driving motor through spline, and is provided with a first high-speed driving gear, the intermediate gear shaft is respectively provided with a first reduction driven gear, a second high-speed gear driving gear and a second low-speed gear driving gear, the first reduction driven gear, the second high-speed gear driving gear and the second low-speed gear driving gear are all fixed on the intermediate gear shaft, the first high-speed driving gear and the first reduction driven gear form a first parallel shaft meshing gear pair, the second high-speed gear driving gear and the high-speed gear from driven gear form a second high-speed gear meshing gear pair, and the second low-speed gear driving gear and the low-speed gear from driven gear form a second low-speed gear meshing gear pair.

[0008] Further, the high-speed gear from driven gear and the low-speed gear from driven gear are both sleeved on the spline hub through needle roller bearings or sliding bearings, the spline hub is provided with a spline at the middle position and is provided with shaft shoulders at both ends, one end of the high-speed gear from driven gear and the low-speed gear from driven gear is axially limited by the shaft shoulders at both ends of the spline, and the other end is axially limited on the spline hub through the combination of the snap spring and the snap spring washer, one side of the snap spring washer is provided with an oil guide groove and directly contacts with the high-speed gear from driven gear and the low-speed gear from driven gear.

[0009] The high-speed gear shaft, the intermediate gear shaft and the spline hub are all arranged between the front end shell and the middle section shell and are supported by deep groove ball bearings.

[0010] Further, the planetary gear train speed reduction mechanism comprises a sun gear shaft, a planetary gear, a planetary shaft, a ring gear, an inner planet carrier, an outer planet carrier; one side of the sun gear shaft is provided with an external spline, which is engaged with the internal spline provided on the spline hub, the outer ring is engaged with the planetary gear, the planetary gear is sleeved on the planetary shaft through a needle bearing, and rotates relative to the planetary shaft, the inner planet carrier and the outer planet carrier are both provided with holes matched with the planetary shaft, the two ends of the planetary shaft are respectively supported in the matched holes of the outer planet carrier and the inner planet carrier through interference and clearance fit, and the inner planet carrier and the outer planet carrier are respectively supported on the middle shell and the rear end shell through tapered roller bearings; the transition flange and the outer planet carrier are connected through splines. In addition, in order to reduce the wear between the two ends of the sun gear and the planetary gear and the inner planet carrier and the outer planet carrier during meshing movement, a higher-hardness gasket after heat treatment is arranged between the sun gear shaft, the planetary gear and the inner planet carrier and the outer planet carrier.

[0011] Further, the shift driving mechanism comprises a shift engagement sleeve, a shift fork, a shift lever and a shift motor, the shift engagement sleeve is provided with an internal spline, which is engaged with the external spline of the spline hub, the high-speed gear driven gear and the low-speed gear driven gear are both provided with engagement teeth connected with the shift engagement sleeve, when the internal spline of the shift engagement sleeve is simultaneously engaged with the high-speed gear driven gear engagement teeth and the external spline of the spline hub, the power flow is the driving motor, the high-speed gear shaft, the intermediate gear shaft, the high-speed gear driven gear, the engagement sleeve, the spline hub, the planetary gear train speed reduction mechanism, the transition flange and the rim, which is the high-speed gear; when the internal spline of the shift engagement sleeve is simultaneously engaged with the low-speed gear driven gear engagement teeth and the external spline of the spline hub, the power flow is the driving motor, the high-speed gear shaft, the intermediate gear shaft, the low-speed gear driven gear, the shift engagement sleeve, the spline hub, the planetary gear train speed reduction mechanism, the transition flange and the rim, which is the low-speed gear, and when the internal spline of the shift engagement sleeve is only engaged with the external spline of the spline hub, and the high-speed gear driven gear engagement teeth and the low-speed gear driven gear engagement teeth are both separated, it is the neutral position.

[0012] Further, the shift fork is clamped in the groove on the outer surface of the shift sleeve, the shift fork and the shift lever are provided with a ball screw pair at the contact position to realize transmission, the shift lever is supported on the middle shell through two angular contact ball bearings, and the two angular contact ball bearings are axially limited by a snap spring, thereby limiting the axial displacement of the shift lever. At the contact position of the shift lever and the shift motor, the connection is made through a flat key, the output power of the driving device is transmitted to the ball screw pair position through the shift lever, the power drives the shift lever to rotate under the action of the two angular contact ball bearings, and then at the matching position of the shift lever and the shift fork, the shift fork is driven to move axially relative to the shift lever by the force between the ball screw pairs, thereby driving the reciprocating axial movement of the shift sleeve. The shift motor and the driving motor are arranged on the same side and connected with the front end shell, so that the shift motor and the driving motor are coaxially arranged, which can fully improve the axial space utilization rate of the electric driving wheel set and make the overall structure more compact.

[0013] Further, the shift motor is a DC brushless motor that can realize control of angular displacement, so the rotation angle of the shift motor can be accurately controlled, and then the relative position relationship between the shift fork and the shift lever can be accurately controlled.

[0014] Specifically, during vehicle driving, the high-speed driven gear and the low-speed driven gear are combined with teeth to be inverted conical, and the shift motor is provided with a brake function.

[0015] Specifically, oil sealing devices are arranged between the front end shell and the high-speed gear shaft, between the middle shell and the shift lever, and between the rear end shell and the outer planet carrier, and the middle shell is provided with a vent plug.

[0016] Further, the transition flange plate and the outer planet carrier are connected through spline connection and pre-tightened by double-headed studs and hexagonal flange nut. To prevent the hexagonal flange nut from loosening due to the influence of the internal and external spline engagement gap between the transition flange plate and the outer planet carrier when the electric driving wheel set is reversed, the connection spline type between the transition flange plate and the outer planet carrier is set to be conical spline, so as to solve the problem of loosening of the hexagonal flange nut.

[0017] As a second aspect of the utility model, still provide the vehicle containing the double speed wheel hub integrated electric drive wheel group of no synchronizer, the double speed wheel hub integrated electric drive wheel group of no synchronizer is connected to the suspension system of vehicle through the suspension upper swing arm support fixed to the upper end of midsection shell and the suspension lower swing arm support fixed to the lower end of midsection shell respectively. Still include brake system, the brake system includes brake caliper, brake disc and brake caliper support, the brake caliper is fixedly connected on the rear end shell through the brake caliper support.

[0018] Further, the utility model still includes whole vehicle controller, the drive motor and gear shifting motor of each wheel are connected respectively with the whole vehicle controller, adjust the rotational speed of drive motor, control the action of gear shifting motor.

[0019] Compared with the prior art, the utility model has the beneficial effects that:

[0020] 1, the utility model embeds power system, transmission system and brake system in the wheel hub, arranges high-speed drive motor and gear shifting motor on the same side, and connects them with the front end shell, so that they coincide in axial direction, improves the space utilization in axial direction of electric drive wheel group, and makes the overall structure more compact.

[0021] 2, the gear shifting motor of the utility model is a DC brushless motor capable of realizing control of angular displacement, so the rotation angle of the gear shifting motor can be accurately controlled, and the relative position relationship between the gear shifting fork and the gear shifting lever can be accurately controlled. By adjusting the speed of drive motor in neutral position, smooth gear shifting is realized, the function of gear shifting synchronizer in traditional gear shifting mechanism is replaced, the complex design and processing difficulty of gear shifting synchronizer in traditional gear shifting mechanism are greatly reduced, and the reliability of gear shifting is improved.

[0022] 3, the transmission system is a two-gear three-stage reduction mechanism, wherein, the first-stage parallel shaft meshing gear pair is arranged on one side to offset the high-speed drive motor, so as to leave more space for the arrangement of the suspension lower swing arm, to ensure that the high-speed drive motor does not interfere when the downstroke of the automobile suspension reaches the maximum, and to ensure that the vehicle center faces 80% of the ground clearance requirement on the other side. On the other hand, the speed ratio of the second-stage high-speed gear meshing gear pair is small, that is, the diameter of the second-stage high-speed gear driving gear is large, and the drive motor is a high-speed drive motor. If the second-stage high-speed gear driving gear is directly connected with the drive motor, a large dynamic load will be generated, so the first-stage parallel shaft meshing gear pair is arranged to reduce the rotational speed of the drive motor, and greatly reduce the dynamic load impact degree caused by the high rotational speed of the drive motor on the second-stage high-speed gear driving gear.

[0023] 4, the shift drive form is electric control and electric drive, the precision and controllability of shifting can be ensured, the shifting fork and the shifting lever are in contact with each other, and transmission is realized by means of a ball screw pair, compared with trapezoidal or rectangular thread transmission, the ball screw pair can greatly reduce the wear caused by thread transmission, the ball screw pair has higher transmission efficiency, and has higher margin for rotational speed.

[0024] 5, the high-speed shift driven gear and the low-speed shift driven gear are combined with the tooth processing into an inverted cone shape, and the shift motor is provided with a brake holding function, so that the problem of gear shifting during vehicle driving can be effectively avoided.

[0025] 6, the high-speed and low-speed gears of the electric drive wheel set are realized by controlling the meshing and separation of the inner spline of the joint sleeve and the high-speed gear tooth and the low-speed gear tooth, the needs of the vehicle for higher speed and larger climbing degree under two different working conditions are met, the vehicle can better adapt to complex driving conditions, meanwhile, the output torque is improved, the motor always works in the high-efficiency interval, the power economy of the vehicle is improved, and the driving distance is prolonged.

[0026] 7, due to the influence of the meshing gap between the transition flange plate and the outer planet carrier, the hexagonal flange nut is loose, the connection spline type between the transition flange plate and the outer planet carrier is set as a tapered spline, and the problem that the connection nut is loose due to the influence of the spline meshing gap is effectively solved.

[0027] 8, in order to ensure the smoothness of vehicle shifting and keep the power output uninterrupted during the shifting process, the vehicle is arranged to adopt at least four-wheel drive mode, the front axle of the vehicle adopts a single ratio electric drive wheel set, the speed ratio of which is the same as the high-speed gear ratio of the electric drive wheel set, and the rear axle of the vehicle adopts the two-gear hub integrated electric drive wheel set, that is, the front axle keeps uniform speed driving during the shifting process of the rear axle, so that the power output is uninterrupted during the shifting process of the vehicle, and the speed of the rear axle driving motor during the shifting process of the vehicle can be adjusted by collecting the speed of the front axle driving motor. In addition, during the climbing process of the vehicle, the center of gravity moves backward, the axle load of the front axle is lower than that of the rear axle, so the two-gear hub integrated electric drive wheel set is arranged on the rear axle, and is switched to the low-speed gear large-speed-ratio mode, so as to ensure that the rear axle has enough driving force under the condition of large ground adhesion during the climbing process. This mode can fully utilize the advantage that the rear axle has large ground adhesion when the center of gravity of the vehicle moves during climbing, and meets the demand of the vehicle for large climbing degree.

[0028] 9, the utility model makes full use of the axial and radial dimensions of the structure, the structure is compact, the overall arrangement is more flexible, the weight is light, the integration degree is high, the transmission is efficient, the setting of the shifting mechanism greatly improves the climbing, ditch crossing and obstacle crossing ability of the vehicle, and is especially suitable for four-wheel drive off-road vehicles with rugged working surfaces. Attached Figure Description

[0029] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0030] Figure 1 This is the overall assembly drawing of the electric drive wheel assembly of this utility model;

[0031] Figure 2 This is a cross-sectional view of section AA of the electric drive wheel assembly of this utility model;

[0032] Figure 3 This is a cross-sectional view of the electric drive wheel assembly BB of this utility model;

[0033] Figure 4 This is a cross-sectional view of the electric drive wheel assembly of this utility model (CC section).

[0034] Figure 5 This is a structural diagram of the electric drive wheel assembly transmission system of this utility model;

[0035] Figure 6 This is a structural diagram of the high-speed gear transmission of the electric drive wheel assembly of this utility model;

[0036] Figure 7 This is a structural diagram of the electric drive wheel assembly in neutral gear of this utility model;

[0037] Figure 8 This is a structural diagram of the low-speed transmission of the electric drive wheel assembly of this utility model;

[0038] Figure 9 This is an exploded view of the wheel-side transmission structure of the electric drive wheel assembly of this utility model;

[0039] Among them, 1-drive motor, 2-shift motor, 3-upper control arm bracket of suspension, 4-lower control arm bracket of suspension, 5-front end housing, 6-middle section housing, 7-rear end housing, 8-high speed gear shaft, 9-intermediate gear shaft, 10-spline hub, 11-high speed driven gear, 12-low speed driven gear, 13-shift engagement sleeve, 14-shift fork, 15-shift lever, 16-sun gear shaft, 17-planetary gear, 18-planetary gear shaft, 19-inner planetary carrier, 20-outer planetary carrier, 21-transition flange, 22-double-ended stud, 23-hexagonal flange nut, 24-brake caliper, 25-brake caliper bracket, 26-brake disc, 27-rim, 28-gear ring. Detailed Implementation

[0040] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0041] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0042] Example 1: A synchronizer-free dual-speed hub integrated electric drive wheel set

[0043] As shown in Figures 1-9 A synchronizer-free dual-speed hub integrated electric drive wheel set, comprising a drive motor 1, a front-end housing 5, a middle-section housing 6, a rear-end housing 7, a parallel-shaft reduction mechanism 101, a planetary gear train reduction mechanism 102, a gear shifting drive mechanism 201, a transition flange plate 21 and a rim 27.

[0044] The drive motor 1 and the front-end housing 5 are located outside the rim 27, and the drive motor 1 and the front-end housing 5 are in an integrated structure. One end of the middle-section housing 6 is connected to the front-end housing 5, and the other end penetrates through the rim 27 and is connected to the rear-end housing 7. Toe openings are provided at the connection positions of adjacent two housings to ensure the transmission accuracy of the coaxial arrangement of the transmission mechanism. The output shaft of the drive motor 1 is connected to the input shaft of the parallel-shaft reduction mechanism. The output power of the drive motor 1 is transmitted to the wheel in sequence through the parallel-shaft reduction mechanism 101, the planetary gear train reduction mechanism 102, the transition flange plate 21 and the rim 27.

[0045] The parallel axis reduction mechanism 101 comprises a primary parallel axis meshing gear pair, a secondary high-speed gear meshing pair and a secondary low-speed gear meshing pair, and the main components are a high-speed gear shaft 8, an intermediate gear shaft 9, a spline hub 10, a high-speed gear driven gear 11 and a low-speed gear driven gear 12. The high-speed gear shaft 8 is connected with the output shaft of the driving motor 1 through spline connection and is provided with a primary high-speed driving gear. The intermediate gear shaft 9 is sequentially provided with a primary reduction driven gear, a secondary high-speed gear driving gear and a secondary low-speed gear driving gear, respectively. The primary reduction driven gear, the secondary high-speed gear driving gear and the secondary low-speed gear driving gear are all fixed on the intermediate gear shaft 9. The primary high-speed driving gear and the primary reduction driven gear constitute the primary parallel axis meshing gear pair. The secondary high-speed gear driving gear and the high-speed gear driven gear 11 constitute the secondary high-speed gear meshing pair. The secondary low-speed gear driving gear and the low-speed gear driven gear 12 constitute the secondary low-speed gear meshing pair. Since the speed ratio of the secondary high-speed gear meshing pair is small, that is, the diameter of the secondary high-speed gear driving gear is large, and the driving motor 1 is a high-speed driving motor, if the secondary high-speed gear driving gear is directly connected with the driving motor 1, a large dynamic load will be generated. Therefore, the primary parallel axis meshing gear pair is arranged to reduce the rotating speed of the driving motor 1 and greatly reduce the dynamic load impact of the high rotating speed of the driving motor 1 on the secondary high-speed gear driving gear.

[0046] The high-speed gear driven gear 11 and the low-speed gear driven gear 12 are both sleeved on the spline hub 10 through needle bearings or sliding bearings. The spline hub 10 is provided with a spline at the middle position and is provided with shaft shoulders at both ends of the spline. One end of the high-speed gear driven gear 11 and the low-speed gear driven gear 12 is axially limited by the shaft shoulders at both ends of the spline, and the other end is axially limited on the spline hub 10 through the combination of a snap spring and a snap spring washer. One side of the snap spring washer is provided with an oil guide groove which directly contacts with the high-speed gear driven gear 11 and the low-speed gear driven gear 12 and can reduce the abrasion. The other side of the snap spring washer contacts with the snap spring. The snap spring washer and the spline hub are circumferentially fixed through a key to avoid the abrasion problem caused by the rotation of the snap spring washer and the snap spring. The high-speed gear shaft 8, the intermediate gear shaft 9 and the spline hub 10 are arranged between the front end shell 5 and the middle shell 6 and are supported by deep groove ball bearings.

[0047] The planetary gear train reduction mechanism 102 comprises a sun gear shaft 16, a planetary gear 17, a planetary gear shaft 18, a ring gear 28, an inner planet carrier 19, and an outer planet carrier 20. The sun gear shaft 16 is provided with an external spline on one side, which is engaged with an internal spline of the spline hub 10. The outer ring is engaged with the planetary gear 17. The planetary gear 17 is hollowed on the planetary shaft by a needle bearing and rotates relative to the planetary shaft. The inner planet carrier 19 and the outer planet carrier 20 are both provided with holes matched with the planetary gear shaft 18. The two ends of the planetary gear shaft 18 are supported in the matched holes of the outer planet carrier 20 and the inner planet carrier 19 by interference and clearance fit. The inner planet carrier 19 and the outer planet carrier 20 are supported on the middle section housing 6 and the rear end housing 7 by tapered roller bearings, respectively. In addition, in order to reduce the wear between the sun gear shaft 16 and the planetary gear 17 and the inner planet carrier 19 and the outer planet carrier 20 during the meshing movement, a high-hardness gasket after heat treatment is arranged between the sun gear shaft 16, the planetary gear 17, and the inner planet carrier 19 and the outer planet carrier 20.

[0048] The shift driving mechanism 201 comprises a shift engagement sleeve 13, a shift fork 14, a shift lever 15, and a shift motor 2. The shift engagement sleeve 13 is provided with an internal spline, which is engaged with an external spline of the spline hub 10. The high-speed gear driven gear 11 and the low-speed gear driven gear 12 are both provided with engagement teeth connected with the shift engagement sleeve. When the internal spline of the shift engagement sleeve 13 is simultaneously engaged with the high-speed gear driven gear engagement teeth and the external spline of the spline hub 10, the power flow is the driving motor 1, the high-speed gear shaft 8, the intermediate gear shaft 9, the high-speed gear driven gear 11, the shift engagement sleeve 13, the spline hub 10, the planetary gear train reduction mechanism 201, the transition flange plate 21, and the rim 27, which is the high-speed gear. When the internal spline of the shift engagement sleeve 13 is simultaneously engaged with the low-speed gear driven gear 12 engagement teeth and the external spline of the spline hub 10, the power flow is the driving motor 1, the high-speed gear shaft 8, the intermediate gear shaft 9, the low-speed gear driven gear 12, the shift engagement sleeve 13, the spline hub 10, the planetary gear train reduction mechanism 201, the transition flange plate 21, and the rim 27, which is the low-speed gear. When the internal spline of the shift engagement sleeve 13 is only engaged with the external spline of the spline hub 10, and the high-speed gear driven gear 11 engagement teeth and the low-speed gear driven gear 12 engagement teeth are both separated, it is the neutral position.

[0049] The shift fork 14 is clamped in the groove on the outer surface of the shift sleeve 13, the shift fork 14 and the shift rod 15 are provided with a ball screw pair at the contact position to realize transmission, the shift rod 15 is supported on the middle shell 6 through two angular contact ball bearings and is axially limited by the snap spring on the two angular contact ball bearings, thereby limiting the axial displacement of the shift rod 15. The shift rod 15 is connected with the shift motor 2 at the contact position through a flat key, the output power of the shift motor 2 is transmitted to the ball screw pair position through the shift rod, the power drives the shift rod 15 to rotate under the action of the two angular contact ball bearings, and then at the matching position of the shift rod 15 and the shift fork 14, the shift fork 14 is driven to move axially relative to the shift rod 15 by the force between the ball screw pairs, thereby driving the reciprocating axial movement of the shift sleeve 13. The shift motor 2 and the drive motor 1 are arranged on the same side and are connected with the front end shell 5, so that the shift motor 2 and the drive motor 1 are coaxially arranged, which can fully improve the axial space utilization rate of the electric drive wheel set and make the overall structure more compact.

[0050] The electric drive wheel set can also realize a shift process control strategy, because the shift motor 2 is a direct current brushless motor that can realize controlled angular displacement, the rotation angle of the shift motor can be accurately controlled, and then the relative position relationship between the shift fork 14 and the shift rod 15 can be accurately controlled. When the electric drive wheel set is switched from high speed gear to low speed gear, the vehicle controller VCU sends a shift signal to the driver of the shift motor, the driver of the shift motor drives the shift motor 2 to rotate after receiving the signal, the shift fork is driven to move axially by the ball screw pair between the shift rod 15 and the shift fork 14, and then the shift sleeve 13 is pushed out of the high speed gear driven gear 11 to enter the neutral position. At this time, the rotation speed of the shift sleeve 13 is consistent with the rotation speed of the spline hub 10, and there is a speed difference between the rotation speed of the low speed gear driven gear, therefore, the motor controller MCU needs to adjust the speed of the drive motor 1, so that the rotation speed of the low speed gear driven gear 12 is basically consistent with the rotation speed of the shift sleeve 13, then the shift motor 2 rotates again, the shift sleeve 13 is axially moved by the shift fork 14, so that the inner spline of the shift sleeve 13 and the engagement tooth of the low speed gear driven gear 12 are smoothly engaged, thereby realizing the smooth switching of the electric drive wheel set from high speed gear to low speed gear. By adjusting the speed of the drive motor in the neutral position, the advantages of the wheel motor are utilized to realize smooth shifting, replacing the function of the synchronizer in the transmission shift mechanism. When the electric drive wheel set is switched from low speed gear to high speed gear, the working mode is consistent with the above-mentioned working mode of switching from high speed gear to low speed gear.

[0051] Specifically, to prevent the vehicle from slipping out of gear during driving, the engagement teeth of the high-speed driven gear 11 and the low-speed driven gear 12 are machined into an inverted conical shape, and the shift motor 2 is configured to have a brake function.

[0052] Specifically, oil sealing devices are provided between the front housing 5 and the high-speed gear shaft 8, between the middle housing 6 and the shift lever 15, and between the rear housing 7 and the outer planetary carrier 20; the middle housing 6 is provided with a vent plug.

[0053] Specifically, the transition flange 21 and the outer planetary carrier 20 are connected by a spline, secured by a double-ended stud 22 and a hexagonal flange nut 23. To prevent the hexagonal flange nut 23 from loosening due to the interlocking gap between the inner and outer splines of the transition flange 21 and the outer planetary carrier 20 during forward and reverse rotation, the spline type connecting the transition flange 21 and the outer planetary carrier 20 is set to a tapered spline to solve the problem of the hexagonal flange nut 23 loosening.

[0054] Example 2: A vehicle including an electric wheel set

[0055] Including the synchronizerless dual-speed hub integrated electric drive wheel assembly provided in Example 1, such as Figure 1 As shown, the upper control arm support 3 is fixed to the upper end of the middle housing 6, and the lower control arm support 4 is fixed to the lower end of the middle housing 6. The upper control arm support 3 and the lower control arm support 4 are connected to the vehicle suspension system. A braking system is also included, comprising a brake caliper 24, a brake disc 26, and a brake caliper bracket 25. The brake caliper 24 is fixedly connected to the rear housing 7 via the brake caliper bracket 25.

[0056] This utility model also includes a vehicle controller, which is connected to the high-speed drive motors of each wheel respectively. The vehicle controller sends different speed signals to each motor controller, thereby driving the drive motor to run at different speeds to cope with the speed difference between the left and right drive wheels when the vehicle is turning, as well as the speed difference when the front and rear axle speed ratios are different.

[0057] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A synchronizerless dual-speed hub-integrated electric drive wheel set, characterized by The application relates to a wheel driving device, which comprises a front end shell, a middle section shell, a rear end shell, a driving motor, a gear shifting driving mechanism, a parallel shaft reduction mechanism, a planetary gear train reduction mechanism, a transition flange and a wheel rim. The driving motor and the front end shell are located outside the wheel rim; one end of the middle section shell is connected with the front end shell, and the other end penetrates through the wheel rim and is connected with the rear end shell; toe openings are arranged at the connecting positions of the adjacent two shells; the output shaft of the driving motor is connected with the input shaft of the parallel shaft reduction mechanism, and the output power of the driving motor is transmitted to the wheel through the parallel shaft reduction mechanism, the planetary gear train reduction mechanism, the transition flange and the wheel rim.

2. A synchronizerless dual speed hub integrated electric drive wheel set according to claim 1, characterized in that, The parallel shaft reduction mechanism comprises a high-speed gear shaft, an intermediate gear shaft, a spline hub, a high-speed gear driven gear and a low-speed gear driven gear; the high-speed gear shaft is connected with the output shaft of the driving motor through spline connection and is provided with a primary high-speed driving gear; the intermediate gear shaft is provided with a primary reduction driven gear, a secondary high-speed gear driving gear and a secondary low-speed gear driving gear; the primary reduction driven gear, the secondary high-speed gear driving gear and the secondary low-speed gear driving gear are fixed on the intermediate gear shaft; the primary high-speed driving gear and the primary reduction driven gear form a primary parallel shaft meshing gear pair; the secondary high-speed gear driving gear and the high-speed gear driven gear form a secondary high-speed gear meshing pair; and the secondary low-speed gear driving gear and the low-speed gear driven gear form a secondary low-speed gear meshing pair.

3. A synchronizerless dual speed hub integrated electric drive wheel set according to claim 2, characterized in that, The high-speed gear driven gear and the low-speed gear driven gear are both hollowed on the spline hub through needle roller bearings or sliding bearings; the spline hub is provided with a spline at the middle position and is provided with shaft shoulders at both ends; one end of the high-speed gear driven gear and the low-speed gear driven gear is axially limited by the shaft shoulders at both ends of the spline; the other end is axially limited on the spline hub through the combination of a snap spring and a snap spring washer; one side of the snap spring washer is provided with an oil guide groove and directly contacts the high-speed gear driven gear and the low-speed gear driven gear; the high-speed gear shaft, the intermediate gear shaft and the spline hub are arranged between the front end shell and the middle section shell and are supported by deep groove ball bearings.

4. A synchronizerless dual speed hub integrated electric drive wheel set according to claim 3, characterized in that, The planetary gear train reduction mechanism comprises a sun gear shaft, a planetary gear, a planetary shaft, a ring gear, an inner planet carrier and an outer planet carrier; one side of the sun gear shaft is provided with an external spline and is engaged with an internal spline arranged on the spline hub; the outer circle is engaged with the planetary gear; the planetary gear is hollowed on the planetary shaft through needle roller bearings and rotates relative to the planetary shaft; the inner planet carrier and the outer planet carrier are both provided with holes matched with the planetary shaft; the both ends of the planetary shaft are supported in the matched holes of the outer planet carrier and the inner planet carrier through interference and clearance matching; the inner planet carrier and the outer planet carrier are supported on the middle section shell and the rear end shell through tapered roller bearings; The transition flange is connected with the outer planet carrier through spline connection.

5. A synchronizerless dual speed hub integrated electric drive wheel set according to claim 4, characterized in that, The shift driving mechanism comprises a shift engagement sleeve, a shift fork, a shift lever and a shift motor, the shift engagement sleeve is provided with internal splines and engages with the external splines of the spline hub, the high-speed gear driven gear and the low-speed gear driven gear are both provided with engagement teeth connected with the shift engagement sleeve.

6. A synchronizerless dual speed hub integrated electric drive wheel set according to claim 5, characterized in that, The shift fork is clamped in the groove on the outer surface of the shift engagement sleeve, the shift fork and the shift lever are provided with a ball screw pair at the contact position, the shift lever is supported on the middle shell through two angular contact ball bearings and is axially limited by the snap spring to limit the axial displacement of the shift lever, and the shift lever is connected with the shift motor through a flat key at the contact position.

7. A synchronizerless dual speed hub integrated electric drive wheel set according to claim 6, characterized in that, The shift motor and the driving motor are arranged on the same side and are connected with the front end shell.

8. A synchronizerless dual speed hub integrated electric drive wheel set according to claim 6, characterized in that, The shift motor is a direct current brushless motor.

9. A synchronizerless dual speed hub integrated electric drive wheel set according to claim 7, characterized in that, The engagement teeth of the high-speed gear driven gear and the low-speed gear driven gear are inverted conical.

10. A vehicle characterized by comprising: The double-speed hub integrated electric drive wheel set without synchronizer comprises a double-speed hub integrated electric drive wheel set without synchronizer according to any one of claims 1-9, and is connected to the frame of the vehicle through the suspension upper swing arm support fixed to the upper end of the middle shell and the suspension lower swing arm support fixed to the lower end of the middle shell. The vehicle controller is connected with the driving motor and the shift motor of each wheel respectively, adjusts the rotating speed of the driving motor and controls the action of the shift motor.

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