Floating noise-reduction speed-reduction hub motor

Abstract

The utility model relates to a floating noise-reduction speed-reduction hub motor, which comprises a motor shell consisting of an end cover and a brake cover, a motor part serving as a power source and a speed reducer part driven by the motor part are arranged in the motor shell, the speed reducer part is designed with radial and axial floating amounts, and the speed reducer part adopts a planetary gear train structure. And the speed reducer part drives wheels of the motor shell to rotate. According to the utility model, the original structure in the motor is adopted to form a new output speed reducer, and the radial and axial floating quantity design is added in the speed reducing structure, so that the purposes of high reliability and noise reduction are achieved on the basis of improving the torque coefficient.

Description

Technical Field

[0001] The utility model relates to the technical field of hub motors, in particular to a floating noise reduction and speed reduction hub motor. Background Art

[0002] With the development of new energy technologies, the trend of electrification has gradually spread to various industries. Electric two-wheeled vehicles will gradually replace traditional fuel motorcycles. Existing electric vehicles mostly use hub motors as a power source, and there is a further demand for high-power-density hub motors.

[0003] Most existing two-wheel hub motors are radial flux hub motors. The power density of direct-drive hub motors is limited under the same volume. In order to improve the torque coefficient, this scheme adds a reducer on the basis of the radial flux hub motor to achieve the improvement of the power density of the motor under limited volume.

[0004] Existing products on the market have the following defects:

[0005] Currently, most reduction hub motors are composed of a sun gear, planetary gears, and a ring gear. Since the manufacturing cost of the ring gear is higher than that of the sun gear and planetary gears, and in order to ensure that the ring gear has sufficient gear accuracy and cost-effectiveness, the heat treatment method currently used is mostly tempering treatment. However, the load-bearing capacity of the gears treated by the tempering treatment is not as good as that of the quenching treatment, resulting in the need for regular replacement of the gears, which greatly increases the after-sales cost.

[0006] Existing hub motor solutions with planetary reduction gears generally produce high noise levels. Metal pinions and nylon pinions are usually used to reduce noise levels. However, the reliability and lifespan of existing nylon gears are far inferior to those of metal gears, significantly increasing after-sales costs. Utility Model Content

[0007] In response to the shortcomings of the above-mentioned existing production technology, the applicant provides a floating noise reduction reduction hub motor with a reasonable structure, which adopts a gearless structure to improve system reliability and service life, and uses elastic pads to provide floating space to achieve the purpose of noise reduction.

[0008] The technical solutions adopted in this utility model are as follows:

[0009] A floating noise reduction hub motor includes a motor housing composed of an end cover and a brake cover. The motor housing is provided with a motor part as a power source and a reducer part driven by the motor part. The reducer part is designed with radial and axial floating amounts.

[0010] The reducer part adopts a planetary gear train structure, and the reducer part drives the wheels of the motor housing to rotate.

[0011] As a further improvement of the above technical solution:

[0012] The motor part includes a motor shaft, and the reducer part includes a central shaft. The motor shaft and the central shaft are coaxially connected, and the motor shaft drives the central shaft to rotate synchronously.

[0013] The reducer part includes:

[0014] The first sun gear is interference-fitted on the motor shaft.

[0015] The planetary gear meshes with the first sun gear.

[0016] The second sun gear meshes with the planet gears, and the first sun gear drives the planet gears to rotate around the second sun gear.

[0017] The planet shaft extends from the planet wheel to the brake cover and is connected to the brake cover, and the brake cover is connected to the wheel.

[0018] The wheel extends radially to form a floating reference surface, which extends from the circumference of the motor housing into the motor housing and is parallel to the end face of the planetary gear system structure; the floating amount adjustment position is between the floating reference surface and the planetary gear system.

[0019] An elastic gasket is arranged at the floating amount adjustment position, and the elastic gasket is coaxially sleeved on the planetary shaft.

[0020] The utility model is characterized in that a bearing is sleeved on the planet shaft, one side of the elastic gasket abuts against the bearing, and the other side abuts against the floating reference surface.

[0021] The diameter of the planet gear is larger than the diameter of the second sun gear.

[0022] The planetary gear train structure is equipped with a receiving cavity, the planetary gear train structure is located in the sealed receiving cavity, and the receiving cavity is filled with grease.

[0023] The accommodating cavity structure includes:

[0024] Brake cover ribs, located on the inner wall of the brake cover,

[0025] The wheel rib plate is located on the floating reference surface of the wheel.

[0026] The brake cover ribs and the wheel ribs are closed to form an accommodating cavity, the contour of which matches the outer contour of the planetary gear train structure.

[0027] The beneficial effects of the utility model are as follows:

[0028] The utility model has a compact and reasonable structure and is easy to operate. It adopts a gear ring-less configuration to avoid the strength defect problem caused by the poor bearing capacity of the gear ring. The weight of the overall structure is also lighter. The planetary gear and the sun gear are both external gears with mature processing technology. Combined with carburizing and quenching treatment, the cost is not increased much, but the system reliability and life can be significantly improved.

[0029] Adopting a certain floating design in the installation of planetary gears or sun gears can effectively reduce noise. The utility model adds a rubber pad to the planetary shaft to achieve the purpose of a certain floating amount of the planetary gear during the meshing process. The gear meshing state can be adaptively adjusted to obtain better noise performance.

[0030] The utility model adopts the original part of the motor housing as the design basis of the reducer part, which greatly reduces the use of new parts. The planetary carrier is composed of wheels, covers and planetary shafts, and no separate planetary carrier is required. The motor structure is simplified, the equipment is prevented from being too heavy and the structure is too complicated, and the power density of the motor is increased within a limited volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a cross-sectional view of the overall structure of the utility model.

[0032] Figure 2 It is the motor part and the reducer part of the utility model.

[0033] Figure 3 This is a schematic diagram of the structure of the reducer portion of the utility model.

[0034] Figure 4 This is a schematic diagram of the coordination between the brake cover and the planetary gear train structure of the present invention.

[0035] Figure 5 This is a schematic diagram of the structure of the wheel and planetary gear train of the present invention.

[0036] Figure 6 This is a schematic diagram of another embodiment of the motor shaft of the present invention, which adopts an integrated shaft.

[0037] Among them: 1. End cover; 2. Brake cover; 3. Motor part; 4. Reducer part; 5. Wheel; 6. Accommodation cavity;

[0038] 301, motor shaft; 302, stator assembly; 303, rotor assembly; 304, stator bracket;

[0039] 401, central shaft; 402, first sun gear; 403, planetary gear; 404, second sun gear; 405, planetary shaft; 406, elastic gasket; 407, bearing;

[0040] 501, floating datum;

[0041] 601. Brake cover rib plate; 602. Wheel rib plate. DETAILED DESCRIPTION

[0042] The specific implementation of the present utility model will be described below with reference to the accompanying drawings.

[0043] like Figures 1-6As shown, the floating noise reduction hub motor of this embodiment includes a motor housing composed of an end cover 1 and a brake cover 2. The motor housing is provided with a motor part 3 as a power source and a reducer part 4 driven by the motor part 3. The reducer part 4 is designed with radial and axial floating amounts.

[0044] The reducer part 4 adopts a planetary gear 403 structure, and the reducer part 4 drives the wheel 5 of the motor housing to rotate.

[0045] The motor part 3 includes a motor shaft 301 , and the reducer part 4 includes a central shaft 401 . The motor shaft 301 and the central shaft 401 are coaxially connected, and the motor shaft 301 drives the central shaft 401 to rotate synchronously.

[0046] The reducer part 4 includes:

[0047] The first sun gear 402 is interference-fitted on the motor shaft 301.

[0048] The planetary gear 403 meshes with the first sun gear 402.

[0049] The second sun gear 404 meshes with the planet gear 403, and the first sun gear 402 drives the planet gear 403 to rotate around the second sun gear 404.

[0050] The planet shaft 405 extends from the planet wheel 403 to the brake cover 2 and is connected to the brake cover 2 , and the brake cover 2 is connected to the wheel 5 .

[0051] The wheel 5 extends radially to form a floating reference surface 501, which extends from the circumference of the motor housing into the motor housing and is parallel to the end surface of the planetary gear 403 system structure; the floating amount adjustment position is between the floating reference surface 501 and the planetary gear 403 system.

[0052] An elastic gasket 406 is provided at the floating amount adjustment position, and the elastic gasket 406 is coaxially sleeved on the planetary shaft 405 .

[0053] The feature is that a bearing 407 is sleeved on the planetary shaft 405 , and one side of the elastic gasket 406 abuts against the bearing 407 , and the other side abuts against the floating reference surface 501 .

[0054] The diameter of the planet gear 403 is greater than the diameter of the second sun gear 404 .

[0055] The planetary gear 403 system structure is equipped with an accommodating chamber 6 . The planetary gear 403 system structure is located in the sealed accommodating chamber 6 , and the accommodating chamber 6 is filled with grease.

[0056] The structure of the accommodating cavity 6 includes:

[0057] Brake cover 2 rib plate, located on the inner wall of brake cover 2,

[0058] The wheel rib plate 602 is located on the floating reference surface 501 of the wheel 5.

[0059] The ribs of the brake cover 2 and the wheel ribs 602 are closed to form an accommodating cavity 6 , the contour of which matches the outer contour of the planetary gear 403 system structure.

[0060] The specific structure and working principle of the utility model are as follows:

[0061] The hub motor of the present invention comprises a motor part 3 and a reducer part 4 , and both the motor part 3 and the reducer part 4 are located in the motor housing.

[0062] The motor part 3 includes a central shaft 401 and a motor shaft 301 which are coaxially connected. A stator bracket 304, a stator assembly 302, and a rotor assembly 303 are sleeved on the motor shaft 301. A wheel 5 is installed on the outside, and a bearing 407 is installed at the transmission connection.

[0063] The reducer part 4 includes a sun gear and planetary gears 403 . The two sun gears are sleeved on the central shaft 401 and the motor shaft 301 . Each of the two planetary gears 403 is engaged with the two sun gears. Each planetary shaft 405 is connected to the disc brake cover 2 .

[0064] When the motor is running, the stator assembly 302 is energized, and the rotor assembly 303 is driven to rotate through the changing magnetic field. The rotor assembly 303 drives the motor shaft 301 that cooperates with it to rotate. The motor shaft 301 drives the first sun gear 402 that is installed with an interference fit to rotate. The first sun gear 402 drives the planetary gears 403. The planetary gears 403 rotate around the sun gear, driving the planetary carrier to rotate to output power.

[0065] The planetary carrier mainly comprises a disc brake cover 2 and a wheel 5. When the disc brake cover 2 is driven by the planetary wheel 403, the wheel 5 rotates synchronously to output power.

[0066] One of the improvements of the present invention is that a rubber pad is installed on the planetary shaft 405. The rubber pad is located between a set of bearings 407 and the axial end face of the wheel 5 and is clamped by the bearings 407 and the wheel 5. This allows the planetary gear 403 assembly to float in both axial and radial directions during operation, allowing the gears to engage adaptively and reducing noise during operation.

[0067] The disc brake cover 2 and the wheel 5 are respectively provided with a brake cover 2 rib plate and a wheel rib plate 602. These rib plates match the shapes of the planetary gears 403 and the sun gear to form a closed accommodating chamber 6 dedicated to accommodating the planetary gear 403 group. The lubrication used for the planetary gear 403 group only needs to be added to the accommodating chamber 6, which greatly reduces the consumption of grease.

[0068] As an alternative embodiment, the combined structure of the motor shaft 301 and the first sun gear 402 may also be replaced with an integrally formed motor shaft 301 to improve the strength of the structure and extend its service life.

[0069] The advantage of the utility model is that the original structure inside the motor is used to form a new output reducer, and radial and axial floating amount designs are added to the reduction structure to meet the purpose of improving the torque coefficient while achieving high reliability and noise reduction.

[0070] The above description is an explanation of the utility model, not a limitation of the utility model. The scope of the utility model is defined by the claims. Any form of modification can be made within the scope of protection of the utility model.

Claims

1. A floating noise reduction speed reduction hub motor, comprising a motor housing consisting of an end cover (1) and a brake cover (2), characterized in that: The motor housing is provided with a motor part (3) serving as a power source and a reducer part (4) driven by the motor part (3). The reducer part (4) is designed with radial and axial floating amounts. The reducer part (4) adopts a planetary gear (403) system structure. The reducer part (4) drives the wheel (5) of the motor housing to rotate.

2. The floating noise reduction reduction hub motor according to claim 1, characterized in that: The motor part (3) includes a motor shaft (301), and the reducer part (4) includes a central shaft (401). The motor shaft (301) and the central shaft (401) are coaxially connected, and the motor shaft (301) drives the central shaft (401) to rotate synchronously.

3. The floating noise reduction reduction hub motor according to claim 2, characterized in that: The reducer part (4) comprises: The first sun gear (402) is interference-mounted on the motor shaft (301). The planetary gear (403) is meshed with the first sun gear (402). The second sun gear (404) is meshed with the planet gear (403), and the first sun gear (402) drives the planet gear (403) to rotate around the second sun gear (404). The planetary shaft (405) extends from the planetary wheel (403) to the brake cover (2) and is connected to the brake cover (2). The brake cover (2) is connected to the wheel (5).

4. The floating noise reduction reduction hub motor according to claim 3, characterized in that: The wheel (5) extends radially to form a floating reference surface (501), which extends from the circumference of the motor housing into the motor housing and is parallel to the end surface of the planetary gear (403) system structure; the floating amount adjustment position is between the floating reference surface (501) and the planetary gear (403) system.

5. The floating noise reduction reduction hub motor according to claim 4, characterized in that: An elastic gasket (406) is provided at the floating amount adjustment position, and the elastic gasket (406) is coaxially sleeved on the planetary shaft (405).

6. The floating noise reduction reduction hub motor according to claim 5, characterized in that: A bearing (407) is sleeved on the planetary shaft (405), and one side of the elastic gasket (406) abuts against the bearing (407) and the other side abuts against the floating reference surface (501).

7. The floating noise reduction reduction hub motor according to claim 5, characterized in that: The diameter of the planetary gear (403) is greater than the diameter of the second sun gear (404).

8. The floating noise reduction reduction hub motor according to claim 4, characterized in that: The planetary gear (403) system structure is equipped with an accommodating chamber (6). The planetary gear (403) system structure is located in the sealed accommodating chamber (6), and the accommodating chamber (6) is filled with grease.

9. The floating noise reduction reduction hub motor according to claim 8, characterized in that: The accommodating cavity (6) structure comprises: The brake cover (2) rib plate is located on the inner wall of the brake cover (2). The wheel rib plate (602) is located on the floating reference surface (501) of the wheel (5). The brake cover (2) rib plate and the wheel rib plate (602) are closed to form an accommodating cavity (6), and the contour of the accommodating cavity (6) is consistent with the outer contour of the planetary gear (403) system structure.

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