WO2024114562A1

WO2024114562A1 - Geared hub motor

Info

Publication number: WO2024114562A1
Application number: PCT/CN2023/134272
Authority: WO
Inventors: 臧文叶
Original assignee: 臧文叶
Priority date: 2022-12-01
Filing date: 2023-11-27
Publication date: 2024-06-06
Also published as: CN218829466U

Abstract

A geared hub motor, which comprises a hub (1), a left hub shaft (2), a right hub shaft (3), a housing (4), a motor assembly (5), a reduction gear mechanism, and a shaft coupling (6); the housing (4) is located in an inner cavity of the hub (1); the housing (4) is provided with a motor cavity and a gear cavity which are separated left to right; the right end of the left hub shaft (2) is non-rotatably assembled to and cooperating with the left end of the housing (4); an output gear (10) of the reduction gear mechanism is sleeved on the right hub shaft (3); a motor shaft hole and an output shaft hole are formed in the left and right ends of the gear cavity; an oil seal (17) is arranged between the motor shaft (11) and the motor shaft hole, an oil seal (17) is arranged between an extending end of the output gear (10) and the output shaft hole, and an oil seal (17) is arranged between an inner hole of the output gear (10) and the right hub shaft (3); the shaft coupling (6) is located between the housing (4) and the hub (1), and the shaft coupling (6) is sleeved on the right hub shaft (3). A mechanism of the motor are simple, and same is convenient to install and has an uncomplicated appearance; the structural design facilitates the design of oil seals for sealing, causing the reduction gear mechanism to be able to be lubricated by means of motor oil; no leakage occurs, the lubricating effect is good, and same has a long service life.

Description

Hub gear motor

Technical Field

The utility model relates to a hub gear motor.

Background technique

The wheel hub motor integrates the motor in the wheel hub, and directly drives the wheel hub to rotate through the motor in the wheel hub. At the same time, in order to make the small power motor also output a large torque, a gear reduction mechanism can be added to amplify the torque of the small power motor through the gear reduction mechanism.

For example, Chinese patent CN102410317A discloses a centrifugal clutch and an electric vehicle gear-shifting drive hub having the clutch, which performs gear shifting and speed change through a motor and a gear-shifting gear mechanism in the hub.

The technical problems existing in the prior art are: the structural design is not entirely reasonable, which is not conducive to production and assembly; the structural design is unreasonable, which is not conducive to setting up a sealing structure.

Utility Model Content

The technical problem to be solved by the utility model is to provide a hub gear motor with simple structure and convenient assembly.

The technical solution adopted by the utility model to solve its technical problems is: a hub gear motor, comprising a hub, a left hub shaft, a right hub shaft, a casing, a motor assembly, a reduction gear mechanism and a coupling, wherein the left hub shaft and the right hub shaft are rotatably mounted in the shaft holes on the left and right sides of the hub respectively, the casing is located in the inner cavity of the hub, the casing has a motor cavity and a gear cavity separated by left and right, the motor assembly is mounted in the motor cavity, and the reduction gear mechanism is mounted in the gear cavity; the right end of the left hub shaft is non-rotatably assembled with the left end of the casing; the reduction gear mechanism comprises an input gear and an output gear, the input gear is located on the motor shaft of the motor assembly extending into the gear cavity, and is used to input the power of the motor assembly into the reduction gear mechanism, the output gear is sleeved on the right hub shaft extending into the gear cavity, and is used to output the power reduced by the reduction gear mechanism; the gear The left and right ends of the cavity are provided with a motor shaft hole and an output shaft hole. The motor shaft extends into the gear cavity through the motor shaft hole. An oil seal is arranged between the motor shaft and the motor shaft hole for sealing. The protruding end of the output gear extends through the output shaft hole. An oil seal is arranged between the protruding end of the output gear and the output shaft hole for sealing. An oil seal is arranged between the inner hole of the output gear and the right wheel hub shaft for sealing. The coupling is located between the casing and the wheel hub. The coupling is mounted on the right wheel hub shaft. The left end of the coupling is in transmission cooperation with the protruding end of the output gear extending from the casing, and the other end of the coupling is in transmission cooperation with the wheel hub.

The utility model carefully designs the entire gear box and the motor together and transmits power to the wheel hub through the coupling, which has the effects of simple structure, convenient installation and simple appearance;

The structural design of the utility model is convenient for designing oil seals, so that the reduction gear mechanism in the gear cavity can be lubricated by engine oil, and can ensure that the engine oil in the gear cavity will not leak, with good lubrication effect and long service life. However, due to structural design reasons, CN102410317A in the background technology cannot be designed with oil seals, resulting in that the gear mechanism in the gearbox housing can only be lubricated by lubricating grease, and the lubrication effect is poor;

The power of the motor is reduced through a reduction gear mechanism, so a small-power DC motor can output a large torque, which saves more energy and achieves a long mileage.

It is further defined that a bearing is arranged between the inner hole of the output gear and the right hub shaft for rotational support, and a step structure is provided in the inner hole of the output gear for limiting the bearing and the oil seal in the inner hole of the output gear, and the oil seal is located on the right side of the bearing in the inner hole of the output gear; a bearing is arranged between the protruding end of the output gear and the output shaft hole for rotational support, and a step structure is provided on the protruding end of the output gear for limiting the bearing and the oil seal on the protruding end of the output gear, and the oil seal on the protruding end of the output gear is located on the left side of the bearing; a bearing is arranged between the motor shaft and the motor shaft hole for rotational support, and a step structure is provided in the motor shaft hole for limiting the bearing and the oil seal in the motor shaft hole, and the oil seal is located on the right side of the bearing in the motor shaft hole.

It is further defined that the reduction gear mechanism is meshed with the input gear and the output gear through a The transition gear is used for speed reduction transmission. The transition gear comprises a first transition gear and a second transition gear which are coaxially arranged. The first transition gear is meshed with the input gear for transmission, and the second transition gear is meshed with the output gear for transmission.

It is further defined that the motor shaft and the right wheel hub shaft are coaxial, and the right end of the motor shaft and the left end of the right wheel hub shaft are rotatably nested and matched through a concave-convex nesting structure, the concave-convex nesting structure includes a convex shaft and a concave hole, and the convex shaft is embedded in the concave hole.

The right hub shaft is relatively long, and there will be a lever effect when it is loaded. At the same time, when the output gear and other gears are in meshing transmission, a repulsive force will be generated, which will act on the left end of the right hub shaft, affecting the operating balance of the right hub shaft. This additional technical feature can offset the above-mentioned influence through the concave-convex nested structure to ensure the rotational stability of the hub motor.

It is further defined that bearings are arranged between the right hub shaft and the shaft hole of the hub and between the right hub shaft and the coupling for rotational support, and the bearing portion of the rotationally supporting coupling is embedded in the shaft hole of the hub.

This additional technical feature can ensure that the rotation reference planes of the hub and the coupling are unified, thereby ensuring the rotation stability of the hub motor.

It is further defined that the casing is a split structure, including a left cover, a left shell, a middle shell and a right shell arranged from left to right, the left cover and the left shell are fixed to the left side of the middle shell by bolts passing through the left cover and the left shell, the right shell is fixed to the right side of the middle shell by bolts passing through the right shell, the left shell and the middle shell constitute a motor cavity, the right shell and the middle shell constitute a gear box, the left cover has a center hole, the left hub shaft has a wire outlet hole, the right end of the left hub shaft is embedded in the center hole of the left cover and is fixedly connected to each other.

It is further defined that the wheel hub includes a wheel hub outer ring, a left wheel hub cover and a right wheel hub cover, and the left wheel hub cover and the right wheel hub cover are fixed to the wheel hub outer ring by bolts.

It is further defined that the transmission matching structure between the coupling and the output gear and the transmission matching structure between the coupling and the hub The transmission matching structure between the coupling and the output gear is a concave-convex transmission matching structure, the concave-convex transmission matching structure between the coupling and the output gear is a cross-shaped protrusion and groove arranged on the end surface, and the concave-convex transmission matching structure between the coupling and the wheel hub is a convex shaft and a concave hole arranged in a ring on the end surface.

This additional technical feature can simplify the assembly difficulty and ensure reliable transmission.

The beneficial effects of the utility model are as follows: the entire gear box and the motor are carefully designed together and the power is transmitted to the wheel hub through the coupling, which has the effects of simple structure, convenient installation and simple appearance; the structural design of the utility model is convenient for designing oil seals, so that the reduction gear mechanism in the gear cavity can be lubricated by the engine oil, and it can be ensured that the engine oil in the gear cavity will not leak, the lubrication effect is good, and the service life is long.

BRIEF DESCRIPTION OF THE DRAWINGS

The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods;

Figure 1 is a schematic diagram of the overall structure of the utility model;

FIG2 is a schematic diagram of the side structure of the utility model;

Fig. 3 is a cross-sectional view taken along line A-A of Fig. 2;

FIG4 is a schematic diagram of the structure after removing the right hub cover and the right shell;

FIG5 is a schematic structural diagram of the coupling of the present invention from a front perspective;

FIG6 is a schematic structural diagram of the coupling of the present invention from the back side;

7 is a schematic structural diagram of the right hub cover of the utility model;

FIG8 is a schematic diagram of the structure of the output gear of the utility model;

In the figure, 1. wheel hub, 1-1. wheel hub outer ring, 1-2. left wheel hub cover, 1-3. right wheel hub cover, 2. left wheel hub shaft, 3. right wheel hub shaft, 4. casing, 4-1. left cover, 4-2. left casing, 4-3. middle casing, 4-4. right casing, 5. motor assembly, 6. coupling, 7. bolt, 8. outlet hole, 9. input gear, 10. output gear, 11. motor shaft, 12. bump, 13. groove, 14. convex shaft, 15. concave hole, 16. transition gear, 16-1. first transition gear, 16-2. second transition gear, 17. oil seal, 18. bearing.

Detailed ways

As shown in FIGS. 1 to 8 , a hub gear motor comprises a hub 1, a left hub shaft 2, a right hub shaft 3, a casing 4, a motor assembly 5, a reduction gear mechanism and a coupling 6. The left hub shaft 2 and the right hub shaft 3 are rotatably mounted in the shaft holes on the left and right sides of the hub 1, respectively. The casing 4 is located in the inner cavity of the hub 1. The casing 4 has a motor cavity and a gear box separated into left and right parts. The motor assembly 5 is mounted in the motor cavity, and the reduction gear mechanism is mounted in the gear cavity.

The motor assembly includes a stator and a rotor.

In order to ensure that the housing 4 and its internal mechanism will not rotate together with the wheel hub 1 , the right end of the left wheel hub shaft 2 and the left end of the housing 4 are non-rotatably assembled and matched.

As shown in Figure 3, the casing 4 is a split structure, including a left cover 4-1, a left shell 4-2, a middle shell 4-3 and a right shell 4-4 arranged from left to right. The left cover 4-1 and the left shell 4-2 are fixed to the left side of the middle shell 4-3 by bolts 7 passing through the left cover 4-1 and the left shell 4-2, and the right shell 4-4 is fixed to the right side of the middle shell 4-3 by bolts 7 passing through the right shell 4-4. The left shell 4-2 and the middle shell 4-3 constitute a motor cavity, and the right shell 4-4 and the middle shell 4-3 constitute a gear box. The left cover 4-1 has a center hole, and the left hub shaft 2 has a wire outlet hole 8 for the outlet of the cable of the motor assembly 5. The right end of the left hub shaft 2 is embedded in the center hole of the left cover 4-1 and fixedly connected to each other, which can be specifically welded to achieve a non-rotatable assembly between the right end of the left hub shaft 2 and the left end of the casing 4.

As shown in Figures 3 and 4, the reduction gear mechanism includes an input gear 9 and an output gear 10. The input gear 9 is located on the motor shaft 11 of the motor assembly 5 extending into the gear cavity, and is used to input the power of the motor assembly 5 into the reduction gear mechanism. The output gear 10 is mounted on the right hub shaft 3 extending into the gear cavity, and is used to output the power after being reduced by the reduction gear mechanism.

As shown in Figures 3, 4, 5, 6 and 7, the coupling 6 is located between the housing 4 and the wheel hub 1, and the coupling 6 is mounted on the right wheel hub shaft 3. The left end of the coupling 6 is in transmission cooperation with the protruding end of the output gear 10 extending out of the housing 4, and the other end of the coupling 6 is in transmission cooperation with the wheel hub 1.

As shown in Figures 5, 6, 7 and 8, the transmission matching structure between the coupling 6 and the output gear 10 and the transmission matching structure between the coupling 6 and the right hub cover 1-3 of the wheel hub 1 are concave-convex transmission matching structures. The concave-convex transmission matching structure between the coupling 6 and the output gear 10 is respectively a cross-shaped protrusion 12 and a groove 13 arranged on the end surface, and the concave-convex transmission matching structure between the coupling 6 and the right hub cover 1-3 of the wheel hub 1 is respectively a convex shaft 14 and a concave hole 15 arranged in a ring shape on the end surface.

As shown in Figures 3 and 4, the reduction gear mechanism performs reduction transmission through a transition gear 16 that meshes with the input gear 9 and the output gear 10 respectively. The transition gear 16 includes a first transition gear 16-1 and a second transition gear 16-2 that are coaxially arranged. The first transition gear 16-1 meshes with the input gear 9 for transmission, and the second transition gear 16-2 meshes with the output gear 10 for transmission.

As shown in FIG3 , the left and right ends of the gear cavity are provided with a motor shaft hole and an output shaft hole. The motor shaft 11 extends into the gear cavity through the motor shaft hole. An oil seal 17 is arranged between the motor shaft 11 and the motor shaft hole for sealing. A bearing 18 is arranged between the motor shaft 11 and the motor shaft hole for rotation support. A step structure is arranged in the motor shaft hole for limiting the bearing 18 and the oil seal 17 in the motor shaft hole. The oil seal 17 is located on the right side of the bearing 18 in the motor shaft hole.

As shown in Figures 3 and 4, the protruding end of the output gear 10 protrudes through the output shaft hole, an oil seal 17 is arranged between the protruding end of the output gear 10 and the output shaft hole for sealing, a bearing 18 is arranged between the protruding end of the output gear 10 and the output shaft hole for rotational support, and a step structure is provided on the protruding end of the output gear 10 for limiting the bearing 18 and the oil seal 17 on the protruding end of the output gear 10. The oil seal 17 is located on the left side of the bearing 18 on the protruding end of the output gear 10.

As shown in FIG3 , an oil seal 17 is provided between the inner hole of the output gear 10 and the right wheel hub shaft 3 for sealing. A bearing 18 is provided between the inner hole of the output gear 10 and the right wheel hub shaft 3 for rotation support. The inner hole of the output gear 10 has a step structure for limiting the bearing 18 and the oil seal 17 in the inner hole of the output gear 10. The oil seal 17 is located on the right side of the bearing 18 in the inner hole of the output gear 10.

As shown in FIG. 2 , the wheel hub 1 includes a wheel hub outer ring 1 - 1 , a left wheel hub cover 1 - 2 and a right wheel hub cover 1 - 3 , and the left wheel hub cover 1 - 2 and the right wheel hub cover 1 - 3 are fixed to the wheel hub outer ring 1 - 1 by bolts 7 .

As shown in Figure 3, the motor shaft 11 and the right wheel hub shaft 3 are coaxial, and the right end of the motor shaft 11 and the left end of the right wheel hub shaft 3 are rotatably nested through a concave-convex nesting structure, which includes a convex shaft 14 and a concave hole 15, and the convex shaft 14 is embedded in the concave hole 15.

Bearings 18 are provided between the right hub shaft 3 and the shaft hole of the hub 1 and between the right hub shaft 3 and the coupling 6 for rotational support. The bearing 18 for rotationally supporting the coupling 6 is partially embedded in the shaft hole of the hub 1 .

A bearing 18 is also provided between the left hub shaft 2 and the shaft hole of the hub 1 for rotational support, and an oil seal 17 is also provided between the left hub shaft 2 and the shaft hole of the hub 1 as well as between the right hub shaft 3 and the shaft hole of the hub 1 for sealing. The oil seal 17 here is only used for waterproofing and dustproofing.

In the description of the present invention, it should be noted that the terms "left" and "right" indicate directions or positional relationships based on the directions or positional relationships shown in FIG3 . They are only for the convenience of describing the present invention and simplifying the description and should not be construed as limitations on the present invention. Those skilled in the art can understand the specific meanings of the above terms based on specific circumstances.

Claims

A hub gear motor, characterized in that it comprises a hub, a left hub shaft, a right hub shaft, a housing, a motor assembly, a reduction gear mechanism and a coupling, wherein the left hub shaft and the right hub shaft are rotatably mounted in shaft holes on the left and right sides of the hub, respectively, the housing is located in the inner cavity of the hub, the housing has a motor cavity and a gear cavity separated on the left and right sides, the motor assembly is mounted in the motor cavity, and the reduction gear mechanism is mounted in the gear cavity;

The right end of the left wheel hub shaft is non-rotatably assembled with the left end of the housing;

The reduction gear mechanism includes an input gear and an output gear. The input gear is located on the motor shaft of the motor assembly extending into the gear cavity, and is used to input the power of the motor assembly into the reduction gear mechanism. The output gear is sleeved on the right hub shaft extending into the gear cavity, and is used to output the power after being reduced by the reduction gear mechanism.

The left and right ends of the gear cavity are provided with a motor shaft hole and an output shaft hole. The motor shaft extends into the gear cavity through the motor shaft hole. An oil seal is arranged between the motor shaft and the motor shaft hole for sealing. The extended end of the output gear extends through the output shaft hole. An oil seal is arranged between the extended end of the output gear and the output shaft hole for sealing. An oil seal is arranged between the inner hole of the output gear and the right wheel hub shaft for sealing.

The coupling is located between the casing and the wheel hub, the coupling is sleeved on the right wheel hub shaft, the left end of the coupling is drivingly matched with the protruding end of the output gear protruding from the casing, and the other end of the coupling is drivingly matched with the wheel hub.
The hub gear motor according to claim 1 is characterized in that: a bearing is arranged between the inner hole of the output gear and the right hub shaft for rotation support, and a step structure is provided in the inner hole of the output gear for limiting the bearing and the oil seal in the inner hole of the output gear, and the oil seal is located on the right side of the bearing in the inner hole of the output gear;

A bearing is arranged between the extended end of the output gear and the output shaft hole for rotation support. A step structure is provided on the extended end of the output gear for limiting the bearing and the oil seal on the extended end of the output gear. The oil seal on the extended end of the output gear is located on the left side of the bearing.

A bearing is arranged between the motor shaft and the motor shaft hole for rotation support. A step structure is provided in the motor shaft hole for limiting the bearing and the oil seal in the motor shaft hole. The oil seal is located on the right side of the bearing in the motor shaft hole.
The hub gear motor according to claim 1 is characterized in that: the reduction gear mechanism performs reduction transmission through a transition gear respectively meshing with the input gear and the output gear, the transition gear comprises a first transition gear and a second transition gear coaxially arranged, the first transition gear meshes with the input gear for transmission, and the second transition gear meshes with the output gear for transmission.
The hub gear motor according to claim 1 is characterized in that: the motor shaft and the right hub shaft are coaxial, and the right end of the motor shaft and the left end of the right hub shaft are rotatably nested through a concave-convex nesting structure, the concave-convex nesting structure includes a convex shaft and a concave hole, and the convex shaft is embedded in the concave hole.
The hub gear motor according to claim 1 is characterized in that bearings are arranged between the right hub shaft and the axial hole of the hub and between the right hub shaft and the coupling for rotational support, and the bearing portion of the rotational support coupling is embedded in the axial hole of the hub.
The hub gear motor according to claim 1 is characterized in that: the housing is a split structure, including a left cover, a left shell, a middle shell and a right shell arranged from left to right, the left cover and the left shell are fixed to the left side of the middle shell by bolts passing through the left cover and the left shell, the right shell is fixed to the right side of the middle shell by bolts passing through the right shell, the left shell and the middle shell constitute a motor cavity, the right shell and the middle shell constitute a gear cavity, the left cover has a center hole, the left hub shaft has a wire outlet hole, the right end of the left hub shaft is embedded in the center hole of the left cover and is fixedly connected to each other.
The hub gear motor according to claim 1 is characterized in that: the hub comprises a hub outer ring, a left hub cover and a right hub cover, and the left hub cover and the right hub cover are fixed to the hub outer ring by bolts.
The hub gear motor according to claim 1 is characterized in that: the transmission matching structure between the coupling and the output gear and the transmission matching structure between the coupling and the wheel hub are concave-convex transmission matching structures, the concave-convex transmission matching structure between the coupling and the output gear are respectively cross-crossed protrusions and grooves arranged on the end surface, and the concave-convex transmission matching structure between the coupling and the wheel hub are respectively annularly arranged protruding shafts and concave holes arranged on the end surface.