Heat dissipation structure of hub driving device

Abstract

The utility model discloses a heat dissipation structure of a hub driving device. The heat dissipation structure comprises a shell and a driving motor. The driving motor comprises a stator shell, a rotor and a motor shaft, one end of the motor shaft extends out of the stator shell and is connected with a driving gear, and a reduction gear set is arranged on one side of the driving gear; one end of the stator shell is fixedly connected with a first supporting frame, the other end of the stator shell is fixedly connected with a second supporting frame, and a first supporting shaft and a second supporting shaft are arranged on the first supporting frame and the second supporting frame; the first supporting shaft is rotationally sleeved with a speed reduction output gear, and the driving gear is connected with a speed reduction driven gear through a speed reduction gear set. A driven gear ring is arranged on the inner side of the shell and meshed with the power output gear. Cooling oil is filled in the shell, and a plurality of spoilers are arranged on the inner wall of the shell. The driving motor is simple in structure and good in heat dissipation effect, the working stability of the driving motor can be improved, and the failure rate of the driving motor is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric two -wheeled vehicle drive technical field especially relates to a heat radiation structure of wheel hub drive device. BACKGROUND

[0002] Electric two -wheeled vehicle as a kind of convenient, economic means of transportation, widely used in people's daily traffic. The existing electric two -wheeled vehicle, mainly adopts side hanging type / central type motor or wheel hub motor as driving mechanism provides driving force. Wheel hub motor, also known as wheel -in motor, its characteristics are that power, transmission and brake device are integrated into wheel hub, so that the mechanical part of electric vehicle can be greatly simplified;But, the wheel hub motor mainly through outer rotor directly transmits torque to rear wheel, therefore, rear wheel output torque is limited by motor power, poor climbing ability;Under heavy load condition, motor overheats seriously, motor is easy to burn. And side hanging type / central type motor power is transmitted to rear axle after speed reduction mechanism, although it can improve the climbing ability of electric vehicle, but since side hanging motor is installed on the side of frame, after installation, the whole protrudes on the side of electric vehicle, so that motor and speed reduction mechanism occupy very large space, which not only easily leads to unstable vehicle gravity center, but also affects appearance. And the existing central motor is installed between two-wheeled vehicle rear fork, although it can reduce the volume of two-wheeled vehicle, but central motor needs independent transmission mechanism to transmit power to rear wheel hub or axle, the overall structure is relatively complex, not only requires high installation space, and will affect the transmission efficiency of power.

[0003] Therefore, the applicant designs a new driving device, by embedding driving motor in transmission shell, then driving transmission shell by driving motor, and integrating speed reduction mechanism in transmission shell to increase output torque;In this way, after connecting transmission shell with two-wheeled vehicle hub, it can realize large torque output. But, since driving motor is located in transmission shell, so that the heat generated by driving motor during work cannot be dissipated in time, especially when large torque output, driving motor heating is particularly serious, which seriously affects the stability of driving motor work, easily causes driving motor failure rate to rise, shortens the service life of driving motor.

[0004] Therefore, it is urgent to design a heat radiation structure suitable for the driving device designed by the applicant, to fully dissipate heat for the driving device, to improve the stability of driving motor work, reduce the failure rate of driving motor, and improve the service life of driving motor. UTILITY MODEL CONTENTS

[0005] The hub driving device's heat dissipation structure of the utility model has the advantages of simple structure, good heat dissipation effect, improved stability of driving motor operation, reduced failure rate of driving motor and prolonged service life of driving motor.

[0006] In order to solve the above technical problems, the utility model adopts the technical scheme as follows: a hub driving device's heat dissipation structure, including shell and driving motor, the driving motor is located in the shell, it includes stator casing, rotor and motor shaft, both ends of motor shaft are rotatably connected with stator casing, and its one end extends stator casing, characterized by: the one end of motor shaft extending stator casing is connected with a driving gear, the driving gear one side is equipped with reduction gear set, the one end of stator casing close to driving gear is fixedly connected with first support frame, the other end is fixedly connected with second support frame, wherein, the first support frame is located in the one side of driving gear away from stator casing, first support shaft and second support shaft are equipped on first support frame and second support frame respectively, first support shaft and second support shaft respectively extend from both ends of shell and are rotatably connected with shell, reduction output gear is rotatably sleeved on first support shaft, the reduction output gear is double gear, and it includes reduction driven gear and power output gear, the driving gear is connected with reduction driven gear through reduction gear set, the position corresponding power output gear is equipped with a driven gear ring on the inner side of shell, the driven gear ring is sleeved on power output gear and is engaged with power output gear, the shell is filled with cooling oil, a plurality of spoiler is equipped on the inner wall of shell around a week, and the gap between spoiler and stator casing has.

[0007] Further, the reduction gear set is connected with stator casing through reduction shaft, wherein, one end of reduction shaft is connected with stator casing, and the other end is connected with stator casing through third support frame, the reduction gear set includes reduction input gear and reduction transmission gear, wherein, the reduction input gear is engaged with driving gear, and reduction transmission gear is engaged with reduction driven gear.

[0008] Further, the first support frame is in the form of a cylindrical structure, and is covered on the driving gear, the open end of the first support frame is outwardly folded to form a connecting flange, and the first support frame is connected with the stator casing through the flange, the side of the first support frame close to the reduction gear set is formed with a notch, the reduction input gear is inserted into the first support frame through the notch and engaged with the driving gear, and the first support shaft is connected with the closed end of the first support frame.

[0009] Further, the second support frame includes a support ring and a support plate, and the support plate has a spacing with the end face of the stator casing, the second support shaft is connected with the support plate, and the support ring penetrates through the shell and is rotatably connected with the shell through a sealing bearing.

[0010] Furthermore, the end of the motor shaft extending out of the stator housing is connected to the stator housing and the first support shaft is connected to the outer casing via sealed bearings.

[0011] Furthermore, on the end face where the stator housing is connected to the second support frame, several guide grooves are distributed around it, and the guide grooves extend from the inside of the support ring to the outside of the support ring.

[0012] Furthermore, the outer casing includes a first casing and a second casing connected together, and both the inner sides of the first casing and the inner sides of the second casing are provided with spoilers.

[0013] Furthermore, the spoilers on the first and second housings are staggered.

[0014] Furthermore, the adjacent sides of the first housing and the second housing are both folded outward to form an annular connecting disc. The first housing and the second housing are connected by the two connecting discs, and a sealing ring is provided between the two connecting discs. The two connecting discs are fitted together to form a connecting flange for connection with the wheel hub.

[0015] Compared with the prior art, the present invention has the following advantages: by filling the space between the housing and the drive motor with cooling oil, the heat generated by the drive motor during operation can be quickly transferred to the housing, thereby achieving rapid heat dissipation and better heat dissipation effect; at the same time, the cooling oil can lubricate the gears, making the drive motor and gears more stable in operation, and can greatly reduce the failure rate of the drive motor and extend the service life of the drive motor. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 for Figure 1 A schematic diagram of its decomposed structure.

[0018] Figure 3 This is a schematic diagram of the drive unit after the outer casing has been removed.

[0019] Figure 4 for Figure 3 A schematic diagram of its decomposed structure.

[0020] Figure 5 Schematic diagram of the installation structure of the first support frame and the third support frame.

[0021] Figure 6 This is a schematic diagram of the installation structure of the second support frame.

[0022] In the diagram: 1—Drive motor, 2—Drive gear, 31—Reduction input gear, 32—Reduction transmission gear, 4—Reduction shaft, 5—First support frame, 61—Support ring, 62—Support plate, 7—First support shaft, 8—Second support shaft, 91—Reduction driven gear, 92—Power output gear, 101—First housing, 102—Second housing, 11—Driven gear ring, 12—Third support frame. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Example: See Figures 1 to 6 A heat dissipation structure for a hub drive device includes a housing and a drive motor 1. The drive motor 1 is located inside the housing and includes a stator housing, a rotor, and a motor shaft. Both ends of the motor shaft are rotatably connected to the stator housing, with one end extending out of the stator housing. In practice, the end of the motor shaft extending out of the stator housing is connected to the stator housing via a sealed bearing (a bearing with an oil seal). As one embodiment, the drive motor 1 is a permanent magnet motor, with coil windings installed inside the stator housing and permanent magnets installed on the rotor.

[0025] One end of the motor shaft extending out of the stator housing is connected to a drive gear 2. A reduction gear set is provided on one side of the drive gear 2. The reduction gear set is connected to the stator housing via a reduction shaft 4, wherein one end of the reduction shaft 4 is connected to the stator housing, and the other end is connected to the stator housing via a third support frame 12. The reduction gear set includes a reduction input gear 31 and a reduction transmission gear 32, wherein the reduction input gear 31 meshes with the drive gear 2. A first support frame 5 is fixedly connected to one end of the stator housing near the drive gear 2, and a second support frame is fixedly connected to the other end, wherein the first support frame 5 is located on the side of the drive gear 2 away from the stator housing. A first support shaft 7 and a second support shaft 8 are respectively provided on the first support frame 5 and the second support frame, respectively, extending from both ends of the housing and rotatably connected to the housing. The first support shaft 7 is also connected to the housing via a sealed bearing. The first support frame 5 has a cylindrical structure and covers the drive gear 2, with its open end folded outward to form a connecting flange, through which it is connected to the stator housing. The first support frame 5, located near the reduction gear set, has a notch formed on its side. The reduction input gear 31 extends into the first support frame 5 through this notch and meshes with the drive gear 2. The first support shaft 7 is connected to the closed end of the first support frame 5. The second support frame includes a support ring 61 and a support plate 62, with a gap between the support plate 62 and the end face of the stator housing. The second support shaft 8 is connected to the support plate 62. The support ring 61 penetrates the housing and is rotatably connected to the housing through a sealed bearing. In implementation, a wire hole is provided on the support plate 62, through which the wire of the drive motor 1 extends, and a sealing plug is provided between the wire and the wire hole.

[0026] A reduction output gear is rotatably mounted on the first support shaft 7. This reduction output gear is a double gear, comprising a reduction driven gear 91 and a power output gear 92. The driving gear 2 is connected to the reduction driven gear 91 via a reduction gear set. The reduction transmission gear 32 meshes with the reduction driven gear 91. Inside the housing, a driven gear ring 11 is provided corresponding to the position of the power output gear 92. This driven gear ring 11 is mounted on the power output gear 92 and meshes with it.

[0027] The housing is filled with cooling oil (usually engine oil). A filling hole with a filler plug is also provided on the housing for easy addition and replacement of cooling oil. By filling with cooling oil, the heat generated by the drive motor 1 can be quickly transferred to the housing for heat dissipation; this improves the operational stability of the drive motor 1 and gears, significantly reduces the failure rate of the drive motor 1, and extends its service life. Simultaneously, the oil also lubricates the gears, reducing wear between them and extending the overall lifespan of the drive unit.

[0028] Several baffles are arranged around the inner wall of the outer casing, with gaps between the baffles and the stator housing. This allows the cooling oil to rotate and flow when the outer casing rotates, resulting in more uniform oil temperature and better heat conduction. In implementation, the outer casing includes a first housing 101 and a second housing 102 connected together, with baffles arranged on the inner sides of both housings. The baffles on the first housing 101 and the second housing 102 are staggered. Adjacent sides of the first housing 101 and the second housing 102 are folded outwards to form annular connecting discs. The first housing 101 and the second housing 102 are connected by two connecting discs, with a sealing ring between them. The two connecting discs are fitted together to form a connecting flange for connection to the hub.

[0029] On the end face where the stator housing is connected to the second support frame, there are several guide grooves (arranged radially along the end face of the stator housing) distributed around it, and the guide grooves extend from the inner side of the support ring 61 to the outer side of the support ring 61. In this way, the cooling oil flows better, thereby improving the heat dissipation effect.

[0030] During operation, the coil windings are energized, driving the rotor to rotate. The rotor then drives the motor shaft, which in turn drives the drive gear 2. The drive gear 2, via a reduction gear set, drives the reduction output gear. Through the engagement of the reduction output gear and the driven gear ring 11, power (torque) is output to the outer casing, causing it to rotate. Thus, after this drive unit is assembled with the frame (rear fork) and wheel hub, it is supported by two support shafts, and the outer casing drives the wheel hub to rotate, propelling the two-wheeled vehicle. Filling the outer casing with cooling oil quickly transfers the heat from the drive motor 1 to the casing, achieving heat dissipation. When the casing rotates, the baffles on the inner side of the casing cause the cooling oil to flow, resulting in a more uniform oil temperature and effectively improving heat dissipation.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of this utility model that do not depart from the spirit and scope of this technical solution should be covered within the scope of the claims of this utility model.

Claims

1. A heat dissipation structure for a hub drive device, comprising a housing and a drive motor; the drive motor is located inside the housing and includes a stator housing, a rotor, and a motor shaft, both ends of the motor shaft being rotatably connected to the stator housing, and one end extending out of the stator housing; characterized in that: One end of the motor shaft extending out of the stator housing is connected to a drive gear, and a reduction gear set is provided on one side of the drive gear. A first support frame is fixedly connected to one end of the stator housing near the drive gear, and a second support frame is fixedly connected to the other end. The first support frame is located on the side of the drive gear away from the stator housing. A first support shaft and a second support shaft are respectively provided on the first and second support frames, extending from both ends of the housing and rotatably connected to the housing. A reduction output gear is rotatably sleeved on the first support shaft. This reduction output gear is a double gear, including a reduction driven gear and a power output gear. The drive gear is connected to the reduction driven gear through the reduction gear set. Inside the housing, a driven gear ring is provided corresponding to the position of the power output gear. This driven gear ring is sleeved on the power output gear and meshes with it. The housing is filled with cooling oil, and several baffles are provided around the inner wall of the housing, with gaps between the baffles and the stator housing.

2. The heat dissipation structure of a hub drive device according to claim 1, characterized in that: The reduction gear set is connected to the stator housing via a reduction shaft, wherein one end of the reduction shaft is connected to the stator housing, and the other end is connected to the stator housing via a third support frame; the reduction gear set includes a reduction input gear and a reduction transmission gear, wherein the reduction input gear meshes with the driving gear, and the reduction transmission gear meshes with the reduction driven gear.

3. The heat dissipation structure of a hub drive device according to claim 2, characterized in that: The first support frame has a cylindrical structure and is mounted on the drive gear. Its open end is folded outward to form a connecting flange, and is connected to the stator housing through the flange. The side of the first support frame near the reduction gear set has a notch. The reduction input gear extends into the first support frame through the notch and meshes with the drive gear. The first support shaft is connected to the closed end of the first support frame.

4. The heat dissipation structure of a hub drive device according to claim 1, characterized in that: The second support frame includes a support ring and a support plate, and there is a gap between the support plate and the end face of the stator housing. The second support shaft is connected to the support plate. The support ring passes through the housing and is rotatably connected to the housing through a sealed bearing.

5. The heat dissipation structure of a hub drive device according to claim 4, characterized in that: The end of the motor shaft extending out of the stator housing is connected to the stator housing, and the first support shaft is connected to the outer casing, all via sealed bearings.

6. The heat dissipation structure of a hub drive device according to claim 4, characterized in that: On the end face where the stator housing is connected to the second support frame, there are several guide grooves distributed around it, and the guide grooves extend from the inside of the support ring to the outside of the support ring.

7. The heat dissipation structure of a hub drive device according to claim 1, characterized in that: The outer shell includes a first shell and a second shell connected together, and both the inner sides of the first shell and the inner sides of the second shell are provided with spoilers.

8. The heat dissipation structure of a hub drive device according to claim 7, characterized in that: The spoilers on the first and second shells are staggered.

9. The heat dissipation structure of a hub drive device according to claim 7, characterized in that: The first housing and the second housing are both folded outward on their adjacent sides to form annular connecting discs. The first housing and the second housing are connected by the two connecting discs, and a sealing ring is provided between the two connecting discs. The two connecting discs are fitted together to form a connecting flange for connection to the wheel hub.

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