Coaxial duplex gear integrated electric drive axle

Abstract

The utility model discloses a coaxial duplex gear integrated electric drive axle which comprises a motor, a planetary gear and a differential mechanism. The hollow shaft is transversely arranged in a rotor cavity of the motor and is fixedly connected with a rotor; the right end of the hollow shaft penetrates through the motor and is fixedly connected with a sun gear of a planetary gear; a planetary gear I of the planetary gear is meshed with an inner gear ring of a differential mechanism; an inner hole in the right end of the differential mechanism is fixedly connected with a right half shaft and is linked with a right hub assembly connected with the other end of the right half shaft; an inner hole in the left end of the differential mechanism is fixedly connected with a left half shaft and linked with a left hub assembly connected with the other end of the left half shaft; the left half shaft penetrates through a shaft cavity of the hollow shaft. The motor and the speed reducer are integrated on the axle, so that the output shaft of the motor is coaxial with the wheels, and design and installation of the electric drive axle are facilitated; the power assembly integrated structure design is adopted, the transmission efficiency is improved, and the power transmission distance is reduced; the structure is compact, light weight is facilitated, the weight can be obviously reduced, the size is reduced, the loading weight and the endurance mileage are effectively improved, and high practicability and wide applicability are achieved.

Description

Technical Field

[0001] This invention relates to an electric drive axle, specifically a coaxial double-tooth integrated electric drive axle, belonging to the field of electric vehicle powertrain technology. Background Technology

[0002] Recently, the development of electric commercial vehicles has been rapid, and electric drive axle technology has also received unprecedented development opportunities. However, traditional electric commercial vehicles use electric motors to replace the original engines and transmissions. The solution is that the drive motor provides power, which is transmitted to the ordinary drive axle through the drive shaft, and then to the wheels to realize vehicle movement. The problem with this solution is that it reduces the chassis layout space, especially for pure electric and hybrid models, where the space layout conflict is more prominent.

[0003] Most existing electric drive axles use the following two types:

[0004] 1. Parallel-shaft electric drive axle: In this type of electric drive axle, the motor shaft is parallel to but not coaxial with the wheel shaft. This type of electric drive axle has the following disadvantages:

[0005] a. The motor is integrated into the reducer, which has a complex structure, makes maintenance and replacement difficult, and is costly.

[0006] b. The deceleration mechanism is complex and includes a shifting mechanism, resulting in a large overall weight. This has a significant impact on the performance of the suspension system, and the service life of the axle housing and the safety of the reducer connecting parts are not easily guaranteed.

[0007] c. Due to the excessive size of the motor and reducer, it is very difficult to simultaneously configure drum air brakes and vibration dampers, resulting in poor adaptability.

[0008] 2. Wheel-side electric drive axle: In this type of electric drive axle, the motor is located at the wheel edge, resulting in a short power transmission path and high efficiency. It is used in low-floor buses. This type of electric drive axle has the following disadvantages:

[0009] a. It is impossible to install a gearbox, making it difficult to coordinate high output torque and maximum vehicle speed;

[0010] b. Both the motor and the reducer are unsprung mass, which significantly increases the unsprung mass and affects the ride comfort of the entire vehicle;

[0011] c. The motor operates in a harsh environment with significant vibration and impact.

[0012] Therefore, it is necessary to provide a new coaxial dual-tooth integrated electric drive bridge. Summary of the Invention

[0013] To address the shortcomings of existing technologies, the present invention aims to provide a coaxial dual-tooth integrated electric drive bridge.

[0014] To achieve the above objectives, the present invention adopts the following technical solution:

[0015] A coaxial double-gear integrated electric drive bridge includes a motor, planetary gears and a differential;

[0016] The hollow shaft is placed horizontally inside the rotor cavity of the motor and is fixedly connected to the rotor;

[0017] The right end of the hollow shaft protrudes from the sun gear of the planetary gear fixed to the motor, and the planet gear I of the planetary gear is connected to the internal gear ring of the differential.

[0018] The right end of the differential is fixed to the right half-shaft, and the right wheel hub assembly is linked to the other end of the right half-shaft.

[0019] The left end inner hole of the differential is fixed to the left half shaft, and the left wheel hub assembly is linked to the other end of the left half shaft.

[0020] The left half-shaft passes through the shaft cavity of the hollow shaft.

[0021] Motor housing I of the above-mentioned motor extends to motor housing II at the left end and motor housing III at the right end;

[0022] The planetary gear is located inside the housing cavity of motor housing III.

[0023] Furthermore, the aforementioned left wheel hub assembly is connected to the left axle housing of the left half-shaft via a rolling bearing, the left axle housing is fixedly connected to the motor housing II via bolts, the motor housing III is fixedly connected to the gearbox housing via bolts, the gearbox housing is fixedly connected to the right axle housing of the right half-shaft via bolts, and the right axle housing is connected to the right wheel hub assembly via a rolling bearing.

[0024] Furthermore, the aforementioned left half-shaft is connected to the motor housing II via bearing I in a rolling connection;

[0025] The left end of the hollow shaft is connected to the motor housing II via bearing II, and the right end is connected to the motor housing III via bearing III.

[0026] The sun gear is meshed with planet gear II, planet gear II is fixedly connected to the planet shaft, the planet shaft is fixedly connected to planet gear I, and planet gear I is meshed with the internal gear ring.

[0027] The left end of the planetary shaft is rollingly connected to the planetary carrier via bearing VII, and the right end of the planetary shaft is rollingly connected to the differential via needle roller bearing.

[0028] The right end of the hollow shaft is connected to the planet carrier of the planetary gear via a rolling bearing V.

[0029] Furthermore, the number of the aforementioned planetary axes, planetary gear I, and planetary gear II are each three, evenly distributed along the circumference.

[0030] The planet carrier and differential of the aforementioned planetary gears are fixedly connected by several connecting rods.

[0031] Furthermore, there are three connecting rods, evenly distributed circumferentially.

[0032] The advantages of this invention are:

[0033] The present invention discloses a coaxial double-gear integrated electric drive axle, which fully integrates the motor, reducer and motor controller on the axle, so that the axis of the motor output shaft is coaxial with the axis of the wheel, which is beneficial to the design and installation of the electric drive axle.

[0034] It adopts an integrated powertrain structure design, which improves transmission efficiency and reduces power transmission distance; the structure is compact and easy to adopt lightweight design, which can significantly reduce weight and size, effectively improve load capacity and driving range, and has strong practicality and wide applicability. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the integrated electric drive bridge.

[0036] Figure 2 This is a schematic diagram of the internal structure of an integrated electric drive bridge.

[0037] Figure 3 This is a schematic diagram of a planetary gear.

[0038] The markings in the attached diagram have the following meanings: 1. Left wheel hub assembly, 2. Left axle housing, 3. Left half shaft, 4. Bearing I, 5. Motor housing II, 6. Bearing II, 7. Motor housing, 8. Stator, 9. Rotor, 10. Hollow shaft, 11. Lock nut, 12. Bearing III, 13. Motor housing III, 14. Thrust bearing, 15. Bearing IV, 16. Bearing V, 17. Gearbox housing, 18. Connecting rod, 19. Needle roller bearing, 20. Differential, 21. Bearing VI, 22. Right axle housing, 23. Right half shaft, 24. Right wheel hub assembly, 25. Needle roller bearing, 26. Planetary gear I, 27. Internal gear ring, 28. Planetary shaft, 29. Planetary gear II, 30. Bearing VII, 31. Planet carrier, 32. Sun gear, 33. Bolt. Detailed Implementation

[0039] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0040] A coaxial double-gear integrated electric drive bridge consists of a motor, planetary gears, a differential, and a hollow shaft.

[0041] Motor structure:

[0042] The motor is horizontally positioned, with the stator 8 housed inside the motor housing I7 and the rotor 9 housed inside the stator 8 cavity. The hollow shaft 10 is horizontally positioned inside the rotor cavity and is fixedly connected to the rotor 9 by a lock nut 11.

[0043] Motor housing I7 has motor housing II5 extending from its left end and motor housing III13 extending from its right end. The connection method is as follows: motor housing II5 is fixedly connected to motor housing I7 by bolts; motor housing I7 is fixedly connected to motor housing III13 by bolts. Motor housing II5 is fixedly connected to stator 8.

[0044] The left end of the motor housing II5 is connected to the hollow shaft 10 via bearing II6; the right end of the hollow shaft 10 is connected to the motor housing III13 via bearing III12.

[0045] Planetary gear structure components:

[0046] The planetary gears are housed within the motor housing III13. The planetary gears consist of a planet carrier, a sun gear, planet gears II, planet gears I, and planet shafts.

[0047] The right end of the hollow shaft 10 is rollingly connected to the planet carrier 31 via bearing V16, and simultaneously, the right end of the hollow shaft 10 is splinedly connected to the sun gear 32. The sun gear 32 is meshed with planet gear II29; planet gear II29 is fixedly connected to the planet shaft 28; the left end of the planet shaft 28 is rollingly connected to the planet carrier 31 via bearing VII30; the planet shaft 28 is fixedly connected to planet gear I26; and planet gear I26 is meshed with the internal gear ring 27 of the differential 20.

[0048] Preferably, there are three planetary axes, three planetary gears I and three planetary gears II, which are evenly distributed along the circumference.

[0049] The planetary carrier 31 and the differential are fixedly connected by several connecting rods. The left end of the connecting rod 18 is fixedly connected to the planetary carrier 31 by bolts 33, and the right end is fixedly connected to the differential 20. The right end of the planetary shaft 28 is rollingly connected to the differential 20 by a needle roller bearing 25.

[0050] Preferably, there are 3 connecting rods, which are evenly distributed circumferentially.

[0051] Differential structure components:

[0052] The differential 20 is located inside the gearbox housing 17.

[0053] The motor housing III13 and the gearbox housing 17 are fixedly connected by bolts.

[0054] The gearbox housing 17 is fixedly connected to the right axle housing 22 by bolts; the right axle housing 22 is connected to the right wheel hub assembly 24 by bearing rolling connection.

[0055] The right half-shaft 23 is located inside the right axle housing 22. The inner hole at the right end of the differential 20 is connected to the left end of the right half-shaft 23 by spline engagement. The right end of the right half-shaft 23 is fixedly connected to the right wheel hub assembly 24.

[0056] The left half-shaft 3 is located inside the left axle housing 2. The left end of the left axle housing 2 is connected to the left wheel hub assembly 1 by a bearing. The right end of the left axle housing 2 is fixedly connected to the motor housing II5 by bolts.

[0057] The inner hole at the left end of the differential 20 is connected to the right end of the left half-shaft 3 via a spline engagement; the left half-shaft 3 is fixedly connected to the left wheel hub assembly 1 through the planetary carrier and the shaft cavity of the hollow shaft. The left half-shaft 3 is connected to the left end of the motor housing II5 via a rolling connection through the bearing I4.

[0058] Operation process:

[0059] The rotor 9 of the motor rotates, driving the hollow shaft 10 to rotate. The hollow shaft 10 drives the sun gear 32 to rotate through the spline at the right end. The sun gear 32 drives the planet gear II 29 to rotate around the planet shaft 28 through gear meshing. The planet gear II 29 and the planet gear I 26 are fixedly connected through the planet shaft 28. The planet shaft 28 drives the planet gear I 26 to rotate. The planet gear I 26, through meshing with the internal gear ring 27, drives the differential 20 to rotate. The differential 20 outputs power to the left wheel hub assembly 1 and the right wheel hub assembly 24 through the left half shaft 3 and the right half shaft 23 respectively.

[0060] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A coaxial double-tooth integrated electric drive bridge, characterized in that, Includes the motor, planetary gears, and differential; The hollow shaft is placed horizontally inside the rotor cavity of the motor and is fixedly connected to the rotor; The right end of the hollow shaft protrudes from the sun gear of the planetary gear fixed to the motor, and the planet gear I of the planetary gear is connected to the internal gear ring of the differential. The right end of the differential is fixed to the right half-shaft, and the right wheel hub assembly is linked to the other end of the right half-shaft. The left end inner hole of the differential is fixed to the left half shaft, and the left wheel hub assembly is linked to the other end of the left half shaft. The left half-shaft passes through the shaft cavity of the hollow shaft.

2. The electric drive bridge according to claim 1, characterized in that, Motor housing I of the motor extends to motor housing II at its left end and motor housing III at its right end. The planetary gear is located inside the housing cavity of motor housing III.

3. The electric drive bridge according to claim 2, characterized in that, The left wheel hub assembly is connected to the left axle housing of the left half-shaft by a rolling bearing. The left axle housing is fixedly connected to the motor housing II by bolts. The motor housing III is fixedly connected to the gearbox housing by bolts. The gearbox housing is fixedly connected to the right axle housing of the right half-shaft by bolts. The right axle housing is connected to the right wheel hub assembly by a rolling bearing.

4. The electric drive bridge according to claim 3, characterized in that, The left half-shaft is connected to the motor housing II via bearing I in a rolling connection. The left end of the hollow shaft is connected to the motor housing II via bearing II, and the right end is connected to the motor housing III via bearing III.

5. The electric drive bridge according to claim 1, characterized in that, The sun gear is meshed with planet gear II, planet gear II is fixedly connected to the planet shaft, the planet shaft is fixedly connected to planet gear I, and planet gear I is meshed with the internal gear ring. The left end of the planetary shaft is rollingly connected to the planetary carrier via bearing VII, and the right end of the planetary shaft is rollingly connected to the differential via needle roller bearing. The right end of the hollow shaft is connected to the planet carrier of the planetary gear via a rolling bearing V.

6. The electric drive bridge according to claim 5, characterized in that, The number of planetary axes, planetary gear I and planetary gear II are three each, and they are evenly distributed along the circumference.

7. The electric drive bridge according to claim 1, characterized in that, The planet carrier and differential of the planetary gear are fixedly connected by several connecting rods.

8. The electric drive bridge according to claim 7, characterized in that, The number of connecting rods is 3, which are evenly distributed along the circumference.

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