A vehicle drive motor with built-in planetary gear reduction unit

Abstract

The present invention provides a vehicle drive motor with a built-in planetary gear reduction unit, which integrates a reduction unit in the inner cavity of the drive motor, makes the vehicle body layout simple and convenient, reduces the vehicle body design cost, and reduces the manufacturing cost. A first end cover and a second end cover are respectively fixed at both ends of the casing, a stator part is fixed on the radial ring wall of the inner cavity of the casing, a rotor core is arranged in the radial inner ring area of ​​the stator core of the stator part, the rotor core is fixed at the radial outer peripheral position of the rotating hub, the radial inner ring of the rotating hub is fixedly mounted on the corresponding axial position of the inner end of the motor shaft, the outer end of the motor shaft is supported by the mounting hole arrangement of the first end cover, the outer ring surface of the area corresponding to the inner cavity of the motor shaft is also provided with a planet carrier through an oil seal sleeve, a plurality of planetary shafts are arranged on the planet carrier, each planetary shaft is respectively provided with a corresponding planetary gear, a sun gear is fixed on the outer ring surface of the inner end of the motor shaft, and the sun gear is meshed and connected with the planetary gears arranged around it.

Description

Technical Field

[0001] The present invention relates to the technical field of drive motors, and in particular to a vehicle drive motor with a built-in planetary gear reduction unit. Background Art

[0002] The existing vehicle drive motor includes a corresponding structure of a stator, a rotor, a housing, an end cover, and an output shaft. When deceleration is required during use, an additional reducer structure needs to be configured, which requires the drive motor and the reduction box to be arranged at the same time when the vehicle body is arranged, so that sufficient space needs to be reserved inside the vehicle body, which in turn makes the vehicle body design cost high and the production cost high. Summary of the invention

[0003] In view of the above problems, the present invention provides a vehicle drive motor with a built-in planetary gear reduction unit, which integrates the reduction unit in the inner cavity of the drive motor, making the vehicle body layout simple and convenient, reducing the vehicle body design cost and reducing the manufacturing cost.

[0004] A vehicle drive motor with a built-in planetary gear reduction unit, characterized in that it includes a casing, a first end cover, and a second end cover, the first end cover and the second end cover are respectively fixedly provided at two ends of the casing, a stator part is fixedly provided on a radial annular wall arranged in an inner cavity of the casing, a rotor core is arranged in a radial inner ring area of ​​a stator core of the stator part, the rotor core is fixedly provided at a radial outer peripheral position of a rotating hub, the radial inner ring of the rotating hub is fixedly sleeved on an axial position corresponding to the inner end of a motor shaft, the outer end side of the motor shaft is convex from the mounting hole arrangement of the first end cover, the outer annular surface of the motor shaft corresponding to the inner cavity is also provided with a planetary carrier through a bearing sleeve, and the planetary carrier is ringed with The dry planetary shafts are each respectively provided with a corresponding planetary gear. A sun gear is fixedly arranged on the outer ring surface of the inner end of the motor shaft. The sun gear and the ring-distributed planetary gear are meshed and connected. The radial outer end of the planetary carrier is fixedly connected to the corresponding end surface of the second end cover through a connecting frame. The axial position of the inner end of the motor shaft is concave to form a central mounting inner concave hole. One end of the transmission shaft is positioned in the central mounting inner concave hole through a bearing. The other end of the transmission shaft is positioned in the second mounting hole arrangement of the second end cover through a bearing. The transmission shaft is used for an external linkage device. A radially outwardly protruding gear ring structure is also arranged in the axial direction of the transmission shaft. The inner ring teeth of the gear ring structure mesh with the planetary gear arrangement.

[0005] It is further characterized by:

[0006] The motor shaft and the wheel hub are connected by a flat key sleeve to ensure that when one of them rotates, the other component will rotate synchronously;

[0007] The end surface of the other end of the transmission shaft is concave to form an internal spline, and the linkage device is inserted into the internal spline through the corresponding connecting shaft, so that the transmission shaft can be connected to the linkage device without occupying external space, further ensuring that the volume of the entire structure is small enough;

[0008] A flange structure is provided at the position where the connection frame and the inner end surface of the second end cover are connected, and the flange structure is fixed to the corresponding end surface of the second end cover by bolts;

[0009] The area formed by the connecting frame, the second end cover, the motor shaft, and the transmission shaft is a closed area for arranging the corresponding structure of the planetary gear reduction unit, so as to ensure that the components of the planetary gear reduction unit are conveniently lubricated;

[0010] Each stator core is provided with an axially penetrating wire slot, and the stator coil is arranged in the wire slot;

[0011] A rotor end plate is fixedly disposed on the end surface of the rotor core facing the second end cover, and the rotor end plate ensures that the rotor core can be installed conveniently and quickly;

[0012] When the product is suitable for hybrid power, the mounting hole position of the first end cover is set as an inner concave structure, and a sealing plate is arranged outside the position of the first end cover corresponding to the mounting hole. The motor shaft passes through the center hole of the sealing plate and then protrudes outward. The sealing plate is also provided with an outer convex guide sleeve along the length area of ​​the motor shaft. The radial outer end of the sealing plate is fixedly connected to the corresponding position of the first end cover by bolts of a ring cloth. An oil seal structure is arranged in the transition area between the sealing plate and the outer convex guide sleeve. The inner ring of the oil seal structure is sleeved on the corresponding position of the motor shaft to ensure sealing.

[0013] When the product is suitable for pure electric use, the outer end of the motor shaft is positioned in the mounting hole of the first end cover through a bearing, the mounting hole is a blind hole, and the outer end of the motor shaft does not protrude outward.

[0014] After adopting the above technical solution, the planetary gear reduction unit is placed on the power output side of the motor, the planet carrier is fixed to the second end cover, the sun gear and the motor rotor share a motor shaft, and the power of the motor is output by the ring gear; the power of the motor rotor is input from the sun gear, the motor shaft is connected to the hub sleeve, and is meshed with the planetary gear; the planet carrier is fixed to the second end cover, and the planetary gear reduction unit is separated from the stator and rotor of the motor, which is convenient for lubrication of the planetary gear reduction unit; the ring gear structure and the transmission shaft are an integrated structure; without increasing the volume of the power system, the built-in planetary gear reduction can output a larger torque and strong power; the built-in planetary gear speed can also be used to meet the high speed requirements of the motor under different operating conditions; with the same torque output, the weight and volume of the power system can be greatly reduced compared with a single motor; the reduction unit is built-in, making the power system structure more compact than an external gearbox; with the same torque output, compared with a single motor, the amount of materials such as magnetic steel and enameled wire is less, and the comprehensive cost is effectively reduced; it enables the reduction unit to be integrated in the inner cavity of the drive motor, making the vehicle body layout simple and convenient, reducing the vehicle body design cost and reducing the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the cross-sectional structure of the hybrid drive motor of the present invention;

[0016] Figure 2 It is a schematic diagram of the cross-sectional structure of the front view of the pure electric drive motor of the present invention;

[0017] The names corresponding to the serial numbers in the figure are as follows:

[0018] Casing 1, first end cover 2, mounting hole 21, second end cover 3, second mounting hole 31, inner cavity 4, stator part 5, stator core 51, stator coil 52, rotor core 6, hub 7, motor shaft 8, oil seal 9, planetary carrier 10, planetary shaft 11, planetary gear 12, sun gear 13, connecting frame 14, flange structure 141, center mounting inner recessed hole 15, transmission shaft 16, gear ring structure 17, inner ring gear 171, spline 18, rotor end plate 19, sealing plate 20, outer convex guide sleeve 201, oil seal structure 202, bearing 22, bearing 23. DETAILED DESCRIPTION

[0019] A vehicle drive motor with a built-in planetary gear reduction unit, see Figure 1It includes a casing 1, a first end cover 2, and a second end cover 3. The first end cover 2 and the second end cover 3 are respectively fixed at both ends of the casing 1. A stator part 5 is fixed on the annular wall of the inner cavity 4 of the casing 1. A rotor core 6 is arranged in the radial inner ring area of ​​the stator core 51 of the stator part 5. The rotor core 6 is fixed to the radial outer peripheral position of the hub 7. The radial inner ring of the hub 7 is fixedly sleeved on the inner end corresponding to the axial position of the motor shaft 8. The outer end of the motor shaft 8 is supported by the mounting hole 21 of the first end cover 2. A planet carrier 10 is also sleeved on the outer ring surface of the motor shaft 8 corresponding to the inner cavity 4 through an oil seal 9. A plurality of planet shafts 11 are arranged on the planet carrier 10. Each planet shaft 11 is respectively sleeved with a corresponding The outer ring surface of the inner end of the motor shaft 8 is fixed with a sun gear 13, and the sun gear 13 is meshed with the ring-distributed planetary gear 12. The radial outer end of the planetary carrier 10 is fixed to the corresponding end surface of the second end cover 3 through a connecting frame 14. The axial position of the inner end of the motor shaft 8 is concave to form a central mounting inner concave hole 15. One end of the transmission shaft 16 is positioned in the central mounting inner concave hole 15 through a bearing 22, and the other end of the transmission shaft 16 is positioned in the second mounting hole 31 of the second end cover 3 through a bearing 23. The transmission shaft 16 is used for an external linkage device. A radially outwardly convex gear ring structure 17 is also arranged on the axial direction of the transmission shaft 16, and the inner ring teeth 171 of the gear ring structure 17 are meshed with the planetary gear 12.

[0020] The motor shaft 8 and the wheel hub 7 are connected by a flat key sleeve to ensure that when one of them rotates, the other component will rotate synchronously;

[0021] The end surface of the other end of the transmission shaft 16 is concave to form an internal spline 18, and the linkage device is inserted into the internal spline 18 through the corresponding connecting shaft, so that the transmission shaft 16 can be connected to the linkage device without occupying external space, further ensuring that the volume of the entire structure is small enough;

[0022] A flange structure 141 is provided at the position where the connection frame 14 and the inner end surface of the second end cover 3 are connected. The flange structure 141 is fixed to the corresponding end surface of the second end cover 3 by bolts.

[0023] The area formed by the connecting frame 14, the second end cover 3, the motor shaft 8 and the transmission shaft 16 is a closed area for arranging the corresponding structure of the planetary gear reduction unit, ensuring that the components of the planetary gear reduction unit are conveniently lubricated;

[0024] Each stator core 51 is provided with an axially penetrating wire slot (not shown in the figure, belonging to the existing mature structure), and the stator coil 52 is arranged in the wire slot;

[0025] A rotor end plate 19 is fixedly disposed on the end surface of the rotor core 6 facing the second end cover 3 , and the rotor end plate 19 ensures that the rotor core 6 can be installed conveniently and quickly.

[0026] Specific embodiment 1, see Figure 1: When the product is suitable for hybrid power, the mounting hole 21 of the first end cover 2 is arranged as a concave structure, and a sealing plate 20 is arranged on the outside of the first end cover 2 corresponding to the mounting hole 21. The motor shaft 8 passes through the center hole of the sealing plate 20 and then bulges outward. The sealing plate 20 is also provided with an outwardly convex guide sleeve 201 along the length area of ​​the motor shaft 8. The radial outer end of the sealing plate 20 is fixedly connected to the corresponding position of the first end cover 2 by annular bolts, and an oil seal structure 202 is arranged in the transition area between the sealing plate 20 and the outwardly convex guide sleeve 201. The inner ring of the oil seal structure 202 is fitted on the corresponding position of the motor shaft 8 to ensure sealing.

[0027] Specific embodiment 2, see Figure 2 The outer end of the motor shaft 8 is positioned in the mounting hole 21 of the first end cover 2 through a bearing. The mounting hole 21 is a blind hole, and the outer end of the motor shaft 8 does not protrude outward.

[0028] Its working principle is as follows: the planetary gear reduction unit is placed on the power output side of the motor, the planet carrier is fixed to the second end cover, the sun gear and the motor rotor share a motor shaft, and the power of the motor is output by the ring gear; the power of the motor rotor is input from the sun gear, the motor shaft is connected to the hub sleeve, and is meshed with the planetary gear; the planet carrier is fixed to the second end cover and isolates the planetary gear reduction unit from the stator and rotor of the motor to facilitate lubrication of the planetary gear reduction unit; the ring gear structure and the drive shaft are an integrated structure.

[0029] In the first specific embodiment, during actual use, when the motor is powered on, power is input at the convex end of the motor shaft, and power is transmitted at the other end of the transmission shaft through an external structure; without increasing the volume of the power system, a larger torque can be output through the built-in planetary gearbox reduction, and the power is strong; the built-in planetary gearbox speed increase can also be used to meet the high speed requirements of the motor under different operating conditions; when outputting the same torque, the weight and volume of the power system can be greatly reduced compared to a single motor; the reduction unit is built-in, making the power system structure more compact than an external gearbox; when outputting the same torque, less materials such as magnetic steel and enameled wire are used compared to a single motor, and the overall cost is effectively reduced.

[0030] While keeping the main size of the motor unchanged, the internal space of the motor is used to arrange the planetary gear reduction unit. The planetary carrier part of the planetary gear is fixed to the motor end cover, and the motor rotor is connected to the sun gear. After being decelerated by the planetary gear, the power is output by the ring gear, which not only meets the power requirements, but also effectively reduces the weight and volume of the motor. It has a compact structure and good power and economy.

[0031] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0032] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A vehicle drive motor with a built-in planetary gear reduction unit, characterized in that: It comprises a casing, a first end cover and a second end cover, wherein the first end cover and the second end cover are respectively fixedly arranged at two ends of the casing, a stator part is fixedly arranged on a radial annular wall arranged in an inner cavity of the casing, a rotor core is arranged in a radial inner ring area of ​​a stator core of the stator part, the rotor core is fixedly arranged in a radial outer peripheral position of a rotating hub, the radial inner ring of the rotating hub is fixedly sleeved in an axial position corresponding to the inner end of a motor shaft, the outer end of the motor shaft is supported in a mounting hole arrangement of the first end cover, a planet carrier is also provided in an outer ring surface of a region corresponding to the inner cavity of the motor shaft through an oil seal sleeve, a plurality of planetary shafts are arranged on the planet carrier, and each planetary shaft is respectively sleeved There are corresponding planetary gears, the outer ring surface of the inner end of the motor shaft is fixedly provided with a sun gear, the sun gear and the ring-distributed planetary gears are meshed and connected, the radial outer end of the planet carrier is fixedly connected to the corresponding end surface of the second end cover through a connecting frame, the axial position of the inner end of the motor shaft is concave to form a central mounting inner concave hole, one end of the transmission shaft is positioned in the central mounting inner concave hole through a bearing, and the other end of the transmission shaft is positioned in the second mounting hole arrangement of the second end cover through a bearing, the transmission shaft is used for an external linkage device, and a radially outwardly convex gear ring structure is also arranged in the axial direction of the transmission shaft, and the inner ring teeth of the gear ring structure mesh with the planetary gear arrangement; When the product is suitable for hybrid power, the mounting hole position of the first end cover is set as an inner concave structure, a sealing plate is set on the outer side of the position of the first end cover corresponding to the mounting hole, the motor shaft passes through the center hole of the sealing plate and then convexes outward, the sealing plate is also provided with an outward convex guide sleeve along the length area of ​​the motor shaft, the radial outer end of the sealing plate is fixedly connected to the corresponding position of the first end cover by bolts of a ring cloth, an oil seal structure is set in the transition area between the sealing plate and the outward convex guide sleeve, and the inner ring of the oil seal structure is sleeved on the corresponding position of the motor shaft; When the product is suitable for pure electric use, the outer end of the motor shaft is positioned in the mounting hole of the first end cover through a bearing, the mounting hole is a blind hole, and the outer end of the motor shaft does not protrude outward.

2. A vehicle drive motor with a built-in planetary gear reduction unit as claimed in claim 1, characterized in that: The motor shaft and the rotating hub are connected via a flat key sleeve.

3. The vehicle drive motor with a built-in planetary gear reduction unit as claimed in claim 1, characterized in that: The end surface of the other end of the transmission shaft is concave to form a spline.

4. The vehicle drive motor with a built-in planetary gear reduction unit as claimed in claim 1, characterized in that: A flange structure is provided at a position where the connection frame and the inner end surface of the second end cover are connected, and the flange structure is fixed to the corresponding end surface of the second end cover by bolts.

5. The vehicle drive motor with a built-in planetary gear reduction unit as claimed in claim 1, characterized in that: The area formed by the connection frame, the second end cover, the motor shaft, and the transmission shaft is a closed area.

6. The vehicle drive motor with a built-in planetary gear reduction unit as claimed in claim 1, characterized in that: Each stator core is provided with an axially penetrating wire slot, and the stator coil is arranged in the wire slot.

7. The vehicle drive motor with a built-in planetary gear reduction unit as claimed in claim 1, characterized in that: A rotor end plate is fixedly disposed on the end surface of the rotor core facing the second end cover.

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