Hub motor with band-type brake structure

Abstract

The utility model relates to a wheel hub motor with a band-type brake structure, which comprises a shell, a rotor, a planetary reducing mechanism and a band-type brake lock, the band-type brake lock is connected with the rotor, power output by the rotor drives the shell to rotate after being decelerated by the planetary reducing mechanism when the wheel hub motor is powered on, and the band-type brake lock enables the rotor to stop rotating when the wheel hub motor is powered off. The power is braked before being decelerated by the planetary speed reducing mechanism; the shell comprises a first shell body and a second shell body, the edge of the first shell body extends to form a middle part, and the second shell body is installed at the end of the middle part. Compared with the prior art, the band-type brake lock is directly braked on the rotor, so that the band-type brake before speed reduction is realized, the torque required by the band-type brake lock is reduced, the cost is reduced, the volume of the band-type brake lock is also reduced, and the structure is more compact; the middle part is integrally formed on the first shell, and the shell can be mounted by mounting the second shell at the end part of the middle part, so that the shell is simpler in structure, more convenient to mount and better in sealing effect.

Description

Technical Field

[0001] The utility model relates to a hub motor with a brake structure, belonging to the technical field of hub motors. Background Art

[0002] Scooters, balance bikes, and electric vehicles are widely used means of transportation. Among them, all scooters are equipped with wheel hub motors to drive the wheels to rotate, but when the wheel hub motor is accidentally powered off, it is easy to slip, resulting in low safety, limited scope of use, and poor practicality when the means of transportation are used. In the prior art, the above problems are solved by setting a brake assembly to brake the motor housing. At the same time, in order to increase the output torque of the wheel hub motor, the current scooters are usually provided with a deceleration assembly. Then, the brake assembly brakes the motor housing after the deceleration assembly decelerates. At this time, the torque required for braking is very large, and the size and cost of the brake assembly are also large. Utility Model Content

[0003] The utility model aims to provide a hub motor with a brake structure for achieving braking before deceleration and reducing the torque required for the brake lock to brake in view of the shortcomings of the prior art.

[0004] To achieve the purpose, the technical solution adopted by the utility model is:

[0005] A hub motor with a brake structure includes a housing, a rotor, a planetary reduction mechanism, and a brake lock. The brake lock is connected to the rotor. When power is on, the power output by the rotor is decelerated by the planetary reduction mechanism and then drives the housing to rotate. When power is off, the brake lock stops the rotor from rotating, so that the power is braked before being decelerated by the planetary reduction mechanism.

[0006] As a further optimization of the above technical solution: it also includes a stator and a motor shaft, the motor shaft is inserted into the stator, the rotor is sleeved on the outside of the stator, and the stator, the rotor, the brake lock and the planetary reduction mechanism are all arranged in the housing and sleeved on the motor shaft.

[0007] As a further optimization of the above technical solution: the inner circumferential surface of the outer shell is integrally formed with an inner gear ring, the planetary reduction mechanism includes a sun gear and a plurality of planetary gears, the sun gear is sleeved on the motor shaft and can rotate relative to the motor shaft, the end of the sun gear is fixed on the rotor, a plurality of the planetary gears are meshed with the sun gear, and the planetary gears are also meshed with the inner gear ring at the same time, the rotor drives the sun gear to rotate, the sun gear drives the planetary gears to rotate, and the planetary gears transmit the power reduction to the outer shell.

[0008] As a further optimization of the above technical solution: the housing includes a first shell and a second shell, the edge of the first shell extends to form a middle part, and the second shell is installed at an end of the middle part.

[0009] As a further optimization of the above technical solution: a rotor fixing plate is installed on the side of the rotor, the brake lock and the planetary reduction mechanism are respectively located on both sides of the rotor, the brake lock includes an electromagnet, a moving coil and a first friction plate mounted on the motor shaft, the moving coil is fixed to the rotor fixing plate and rotates synchronously with the rotor, the electromagnet has a power-off state and a power-on state, in the power-off state, the first friction plate abuts against the moving coil to stop the rotor from running; in the power-on state, the electromagnet attracts the first friction plate to keep the first friction plate away from the moving coil.

[0010] As a further optimization of the above technical solution: the housing and the motor shaft are connected via a first bearing and a first oil seal, the electromagnet is located in the housing, and the first oil seal seals the connection between the housing and the motor shaft.

[0011] As a further optimization of the above technical solution: the outer circumferential surface of the electromagnet is sleeved with a second bearing and a second oil seal, and the outer shell is sleeved on the outside of the electromagnet and connected to the electromagnet through the second bearing and the second oil seal.

[0012] Compared with the prior art, the utility model enables the brake lock to directly brake on the rotor, realizes braking before deceleration, reduces the torque required for the brake lock to brake, reduces the cost, and reduces the volume of the brake lock, making the structure more compact; the middle part is integrally formed on the first shell, and the second shell is installed at the end of the middle part to complete the installation of the outer shell, making the outer shell structure simpler, more convenient to install, and the sealing effect is also better; the inner gear ring is integrally formed on the inner circumferential surface of the first shell, strengthens the synchronization of the transmission connection between the planetary reduction mechanism and the outer shell, reduces the volume of the planetary reduction mechanism and the space occupied, and reduces the overall radial height of the motor; the outer shell can be directly connected to the motor shaft through the first bearing and the first oil seal to ensure the sealing effect; the outer shell can also be set on the electromagnet through the second bearing and the second oil seal, so as to make the internal structure of the motor more compact and shorten the axial length of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic cross-sectional structure diagram of the first embodiment of the utility model.

[0014] Figure 2 It is a schematic cross-sectional structure diagram of the second embodiment of the utility model. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with the accompanying drawings and specific implementations. Figure 1-2 As shown, a hub motor with a brake structure includes a housing, a rotor 4, a planetary reduction mechanism 6 and a brake lock 5. The brake lock 5 is connected to the rotor 4. When the power is on, the power output by the rotor 4 is decelerated by the planetary reduction mechanism 6 and then drives the housing to rotate. When the power is off, the brake lock 5 stops the rotor 4 from rotating, so that the power is braked before being decelerated by the planetary reduction mechanism 6. The utility model allows the brake lock 5 to directly brake on the rotor 4, realizes braking before deceleration, reduces the torque required for the brake lock 5 to brake, reduces the cost, and reduces the volume of the brake lock 5, making the structure more compact.

[0016] In the above technical solution, the stator 3 and the motor shaft 1 are also included. The motor shaft 1 is inserted into the stator 3, and the rotor 4 is sleeved on the outside of the stator 3. The stator 3, the rotor 4, the brake lock 5 and the planetary reduction mechanism 6 are all arranged in the shell and sleeved on the motor shaft 1. The shell includes a first shell 2 and a second shell 7. The edge of the first shell 2 extends to form a middle part 21, and the second shell 7 is installed at the end of the middle part 21. The middle part 21 is integrally formed on the first shell 2, and the installation of the shell can be completed by installing the second shell 7 at the end of the middle part 21, so that the shell structure is simpler, the installation is more convenient, and the sealing effect is also better.

[0017] In the above technical solution: the inner circumference of the shell is integrally formed with an inner gear ring 22, and the inner gear ring 22 is specifically located on the inner circumference of the first shell 2. The inner gear ring 22 is integrally formed on the inner circumference of the first shell 2, which strengthens the synchronization of the transmission connection between the planetary reduction mechanism 6 and the shell, reduces the volume and space occupied by the planetary reduction mechanism 6, and reduces the radial height of the motor as a whole. The planetary reduction mechanism 6 includes a sun gear 61 and a plurality of planetary gears 62, the sun gear 61 is sleeved on the motor shaft 1 and can rotate relative to the motor shaft 1, and the end of the sun gear 61 is fixed on the rotor 4. A plurality of planetary gears 62 mesh with the sun gear 61, and the planetary gears 62 also mesh with the inner gear ring 22. The rotor 4 drives the sun gear 61 to rotate, and the sun gear 61 drives the planetary gear 62 to rotate, and the planetary gear 62 transmits power to the first shell 2 and the shell. When the motor is driven at high speed, the planetary gear 62 provides a larger reduction transmission ratio to achieve a reduction transmission between the rotor 4 and the shell, thereby improving the power density and output torque of the hub motor, so that the motor has a higher speed and a larger power density.

[0018] In the above technical solution: a rotor fixing plate 41 is installed on the side of the rotor 4. The brake lock 5 and the planetary reduction mechanism 6 are respectively located on both sides of the rotor 4. The brake lock 5 includes an electromagnet 51, a moving coil 52 and a first friction plate 53 sleeved on the motor shaft 1. The moving coil 52 is fixed to the rotor fixing plate 41 and rotates synchronously with the rotor 4. The electromagnet 51 has a power-off state and a power-on state. In the power-off state, the first friction plate 53 abuts against the moving coil 52 to stop the rotor 4 from running; in the power-on state, the electromagnet 51 attracts the first friction plate 53 to keep the first friction plate 53 away from the moving coil 52. The specific structure of the brake lock 5 is the same as the structure of the brake assembly in the patent application number "202220274589.4" and the patent name "wheel hub motor and scooter having the same".

[0019] In the first embodiment:

[0020] like Figure 1 As shown, the housing and the motor shaft 1 are connected via the first bearing 71 and the first oil seal 72, the electromagnet 51 is located in the housing, and the first oil seal 72 seals the connection between the housing and the motor shaft 1, with good sealing effect. Specifically, the second housing 7 and the motor shaft 1 are connected via the first bearing 71 and the first oil seal 72.

[0021] In the second embodiment:

[0022] like Figure 2 As shown, the outer circumference of the electromagnet 51 is sleeved with a second bearing 73 and a second oil seal 74, and the outer shell is sleeved on the outer side of the electromagnet 51 and connected to the electromagnet 51 through the second bearing 73 and the second oil seal 74. Specifically, the second housing 7 is sleeved on the outer side of the electromagnet 51. Since the outer shell is directly sleeved on the outer side of the electromagnet 51, the internal structure of the motor is more compact and the axial length of the motor is shortened.

[0023] The preferred specific embodiments of the present utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the present utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the present utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should fall within the protection scope of the present utility model.

Claims

1. A hub motor with a brake structure, comprising a housing, a rotor (4), and a planetary reduction mechanism (6), characterized in that The invention also comprises a brake lock (5), wherein the brake lock (5) is connected to the rotor (4). When power is on, the power output by the rotor (4) is decelerated by the planetary reduction mechanism (6) and then drives the housing to rotate. When power is off, the brake lock (5) stops the rotor (4) from rotating, so that the power is braked before being decelerated by the planetary reduction mechanism (6).

2. The hub motor with a brake structure according to claim 1, characterized in that It also includes a stator (3) and a motor shaft (1), wherein the motor shaft (1) is inserted into the stator (3), the rotor (4) is sleeved on the outside of the stator (3), and the stator (3), the rotor (4), the brake lock (5) and the planetary reduction mechanism (6) are all arranged in the housing and sleeved on the motor shaft (1).

3. The hub motor with a brake structure according to claim 2, characterized in that The inner circumferential surface of the shell is integrally formed with an inner gear ring (22); the planetary reduction mechanism (6) comprises a sun gear (61) and a plurality of planetary gears (62); the sun gear (61) is sleeved on the motor shaft (1) and can rotate relative to the motor shaft (1); the end of the sun gear (61) is fixed on the rotor (4); a plurality of planetary gears (62) are meshed with the sun gear (61); the planetary gears (62) are also meshed with the inner gear ring (22); the rotor (4) drives the sun gear (61) to rotate; the sun gear (61) drives the planetary gears (62) to rotate; the planetary gears (62) transmit power reduction to the shell.

4. The hub motor with a brake structure according to claim 2, characterized in that The housing comprises a first shell (2) and a second shell (7), wherein the edge of the first shell (2) extends to form a middle portion (21), and the second shell (7) is mounted at the end of the middle portion (21).

5. A hub motor with a brake structure according to any one of claims 2 to 4, characterized in that A rotor fixing plate (41) is installed on the side of the rotor (4), and the brake lock (5) and the planetary reduction mechanism (6) are respectively located on both sides of the rotor (4). The brake lock (5) comprises an electromagnet (51), a moving coil (52) and a first friction plate (53) sleeved on the motor shaft (1). The moving coil (52) is fixed to the rotor fixing plate (41) and rotates synchronously with the rotor (4). The electromagnet (51) has a power-off state and a power-on state. In the power-off state, the first friction plate (53) abuts against the moving coil (52) to stop the rotor (4); in the power-on state, the electromagnet (51) attracts the first friction plate (53) to keep the first friction plate (53) away from the moving coil (52).

6. The hub motor with a brake structure according to claim 5, characterized in that The housing is connected to the motor shaft (1) via a first bearing (71) and a first oil seal (72); the electromagnet (51) is located inside the housing; and the first oil seal (72) seals the connection between the housing and the motor shaft (1).

7. The hub motor with a brake structure according to claim 5, characterized in that The outer peripheral surface of the electromagnet (51) is sleeved with a second bearing (73) and a second oil seal (74); the outer shell is sleeved on the outside of the electromagnet (51) and connected to the electromagnet (51) via the second bearing (73) and the second oil seal (74).

Images