A hub motor with built-in electromagnetic brake

Abstract

The utility model discloses a kind of hub motors of built-in electromagnetic brake, it includes electromagnetic brake, electromagnetic brake is set in the motor cavity between stator support and one side end cover, including butterfly brake disc, static brake disc and dynamic brake disc, butterfly brake disc is fixedly arranged in casing, static brake disc and dynamic brake disc are set in butterfly brake disc both sides and are set to motor shaft;Brake manual release device is further provided, including the brake release disc on motor shaft, adjusting bolt and limiting elastic element.The utility model seals electromagnetic brake in motor interior, its working environment has been greatly improved, significantly improves the protection level of brake, brake manual release device can quickly release brake locking state, greatly improve the flexibility and emergency handling capability of vehicle use.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a hub motor with a built-in electromagnetic brake. Background Technology

[0002] Traditional hub motors and brakes are typically installed separately, with the brake externally mounted at one end of the motor or connected via a transmission mechanism. This layout has the following drawbacks: it occupies a large space, which is not conducive to the compact design of the vehicle chassis; the brake is exposed to the external environment, making it susceptible to mud, dust, and corrosive substances, resulting in low protection levels and poor reliability; and the installation structure is complex and maintenance is inconvenient.

[0003] Utility model patent CN217362809U discloses a hub motor with a built-in electric brake, including a hub motor and an electric brake. Part of the electric brake is fixed to an end cover, and another part is sleeved on the stator shaft. The electric brake is located in the mounting cavity and between the stator winding and the stator shaft. The electric brake includes a brake seat with a built-in electromagnetic coil, the brake seat being disposed in the mounting cavity and sleeved on the stator shaft; a clutch plate sleeved on the stator shaft and located at one end of the electromagnetic coil, capable of moving axially along the stator shaft under the drive of the brake seat; and a friction plate sleeved on the stator shaft and fixedly connected to the inner wall of the rear end cover. The clutch plate can abut or separate from the friction plate under the action of the brake seat.

[0004] The brake seat has a movable cavity located at one end of the electromagnetic coil. The electric brake also includes: a fixed plate that covers the movable cavity and is fixedly connected to the brake seat, the fixed plate being sleeved on the stator shaft. The friction plate includes: a fixed part that is fixedly connected at one end to the rear end cover and passes through the fixed plate in the movable cavity at the other end; and a friction part that is disposed in the movable cavity and fixedly disposed on the fixed part at the end away from the rear end cover.

[0005] The brake seat is fixed to the stator shaft by a flat key. The electric brake further includes: a plurality of circularly distributed balls disposed on the brake seat away from the stator plate; a ball bearing plate assembly sleeved on the stator shaft and capable of contacting the balls, wherein a groove is provided on the side of the ball bearing plate assembly near the ball bearing plate assembly; and a handle assembly sleeved on the stator shaft, wherein part of the handle mates with the ball bearing plate assembly and the other part passes through the front end cover, for driving the ball bearing plate assembly to rotate horizontally.

[0006] This technical solution enables the electric brake to be built into the motor hub without affecting the functions of the electric brake and the motor. It also makes the hub motor and electric brake more compact and occupies less space.

[0007] However, since the friction plates are fixed to the end cover, when braking, the brake seat drives the clutch plate to abut against the friction plates, requiring the end cover to withstand enormous pressure and thus demanding high strength. Furthermore, the brake seat structure is overly complex and inconvenient to install. Moreover, the brake cannot be manually released after power failure; if the motor malfunctions, it will be necessary to disassemble the motor to release the brake, causing inconvenience for the maintenance of electric vehicles equipped with this motor. Utility Model Content

[0008] The purpose of this utility model is to provide a hub motor with a built-in electromagnetic brake, which overcomes the shortcomings of existing built-in brakes, such as complex structure and lack of manual brake release after power failure.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A hub motor with a built-in electromagnetic brake includes an electromagnetic brake. The hub motor also includes a housing, a rotor, a stator, a stator support, a motor shaft, and two end caps covering the left and right ends of the housing, respectively. The stator is mounted on the stator support, which is fixedly sleeved on the motor shaft. The rotor is mounted on the inner wall of the housing. The housing and the end caps form a motor cavity. The electromagnetic brake is mounted inside the motor cavity. The electromagnetic brake is located within the motor cavity between the stator support and one end cover. It includes a disc brake, a stationary brake, and a moving brake. The disc brake is fixedly mounted inside the housing. The stationary and moving brakes are fitted onto the motor shaft and positioned on either side of the disc brake. The stationary brake is located on the side closest to the inner wall of the end cover, and the moving brake is located on the side closest to the stator support. The stationary brake is fixed to the stator support by a fixing component, and the moving brake is slidably fitted onto the fixing component. A braking elastic element and an excitation coil are also provided. One end of the braking elastic element is mounted on the stator support, and the other end presses against or is fixed to the moving brake. The braking elastic element is positioned between the moving brake and the stator support. The excitation coil is mounted on the stator support and close to the moving brake.

[0010] The stator bracket is provided with mounting holes for the braking elastic element. One end of the braking elastic element is placed in the mounting hole, and the other end is pressed against or fixed to the dynamic brake disc.

[0011] The stator support has at least three mounting holes, the braking elastic element is a brake spring, and the moving brake disc is made of magnetic material.

[0012] The stator bracket is equipped with a mounting slot for the excitation coil, and the excitation coil is installed in the mounting slot.

[0013] The fixing component that secures the static brake disc to the stator bracket is the positioning bolt, and the moving brake disc is slidably fitted onto the positioning bolt; at least three positioning bolts are provided.

[0014] The positioning bolt is fitted with a positioning bushing. One end of the positioning bushing abuts against the stationary brake disc, and the other end abuts against the stator bracket. The moving brake disc is slidably fitted onto the positioning bushing.

[0015] It is also equipped with a manual brake release device, including a brake release disc, an adjusting bolt, and a limiting elastic element mounted on the motor shaft; the motor shaft is provided with a waist-shaped through-hole groove, and the end face of the motor shaft located on the side of the stationary brake disc is provided with an internal threaded hole, which communicates with the waist-shaped through-hole groove; the brake release disc is located in the waist-shaped through-hole groove, and the adjusting bolt passes through the internal threaded hole and connects to the brake release disc; the moving brake disc is located between the brake release disc and the stator support; the limiting elastic element is located between the stator support and the brake release disc.

[0016] A retaining ring is provided between the brake release disc and the dynamic brake disc. The retaining ring is sleeved on the motor shaft, and the limiting elastic element is provided between the stator bracket and the retaining ring.

[0017] The limiting elastic element is a limiting spring, which is sleeved on the motor shaft.

[0018] The disc brake is fixed to the housing by bolts, and an elastic washer is placed between the bolts and the disc brake.

[0019] In view of the above technical features, the present invention has the following beneficial effects: 1. The electromagnetic brake of the present invention is built into the motor cavity, which effectively reduces the space ratio of the braking system in the whole vehicle and avoids the structural space required for additional installation of the brake outside the motor, making the whole vehicle structure more compact; 2. The brake is sealed inside the motor, which greatly improves its working environment and significantly improves the protection level of the brake, making it more resistant to the corrosion of harsh external environments such as dust, oil, and water vapor, and enhancing the reliability and durability of the system; 3. The present invention provides a manual brake release device without changing the original hub motor structure. This device is easy to operate. When the vehicle is locked and needs to be moved or when it needs to be moved due to special circumstances such as power failure, the brake lock can be easily released through this manual release device without disassembling the hub motor, which greatly improves the flexibility of vehicle use and emergency handling capabilities. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the hub motor of this utility model in the energized state; Figure 2 yes Figure 1 Schematic diagram of part A in the middle; Figure 3 yes Figure 1 Schematic diagram of Part B in the middle section; Figure 4 This is a schematic diagram of the hub motor of this utility model in the power-off state; Figure 5 yes Figure 4 Schematic diagram of the structure of part C; Figure 6 This is a schematic diagram of the connection relationship between the stator bracket and the brake disc in this utility model. Figure 1 ; Figure 7 This is a schematic diagram of the connection relationship between the stator bracket and the brake disc in this utility model. Figure 2 ; Figure 8 This is an exploded structural diagram of the hub motor of this utility model; Figure 9 This is an exploded structural diagram of the manual brake release device in this utility model; Figure 10 This is an exploded view of the connection between the butterfly brake disc and the housing of this utility model.

[0021] In the diagram: 1-Housing; 2-Rotor; 3-Stator; 4-Stator bracket; 5-Motor shaft; 6-End cover; 61-Butterfly brake disc; 62-Static brake disc; 63-Dynamic brake disc; 64-Excitation coil; 65-Brake elastic element; 66-Positioning bolt; 67-Positioning bushing; 71-Brake release disc; 72-Adjusting bolt; 73-Limiting elastic element; 74-Stop ring; 8-Oval through-hole groove; 9-Elastic washer; 91-Bolt. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that these drawings and embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that some components known to those skilled in the art but not related to the main content of the invention may be omitted in the drawings or description. Additionally, for ease of description, some components in the drawings may be omitted, enlarged, or reduced, but this does not represent the actual size or complete structure of the product.

[0023] A hub motor with a built-in electromagnetic brake, such as Figure 1-10 As shown, it includes an electromagnetic brake, a housing 1, a rotor 2, a stator 3, a stator support 4, a motor shaft 5, and two end caps 6 covering the left and right ports of the housing 1 respectively. The stator 3 is mounted on the stator support 4, and the stator support 4 is fixedly mounted on the motor shaft 5. The rotor 2 is mounted on the inner wall of the housing 1. The housing 1 and the end caps 6 together form a motor cavity 10. The electromagnetic brake is mounted inside the motor cavity 10.

[0024] like Figure 1 , Figure 4As shown, the electromagnetic brake is installed in the motor cavity 10 between the stator support 4 and one end cover 6. It includes a disc brake 61, a stationary brake 62, and a moving brake 63. The disc brake 61 is fixedly installed in the housing 1. The stationary brake 62 and the moving brake 63 are sleeved on the motor shaft 5 and located on both sides of the disc brake 61. The stationary brake 62 is located on the side near the inner wall of the end cover 6, and the moving brake 63 is located on the side near the stator support 4. The stationary brake 62 is fixedly installed on the stator support 4 by a fixing component, and the moving brake 63 is slidably sleeved on the fixing component. The moving brake 63 is made of a magnetically attractive material, generally an iron brake disc.

[0025] Preferably, the fixing component that fixes the static brake disc 62 to the stator bracket 4 is the positioning bolt 66, and the moving brake disc 63 is slidably sleeved on the positioning bolt 66.

[0026] Furthermore, such as Figure 7 , Figure 8 As shown, a positioning bushing 67 is fitted onto the positioning bolt 66. One end of the positioning bushing 67 abuts against the stationary brake disc 62, and the other end abuts against the stator bracket 4. The moving brake disc 63 is slidably fitted onto the positioning bushing 67. The positioning bushing 67 limits the distance between the stationary brake disc 62 and the stator bracket 4. Simultaneously, its surface can be designed to be relatively smooth to facilitate the sliding of the moving brake disc 63. At least three positioning bolts 66 are provided, evenly fixed to the side of the stator bracket 4.

[0027] like Figure 8 , Figure 9 As shown, a braking elastic element 65 and an excitation coil 64 are also provided. One end of the braking elastic element 65 is provided on the stator support 4, and the other end is pressed against or fixed to the moving brake disc 63. The braking elastic element 65 is compressed and provided between the moving brake disc 63 and the stator support 4. The excitation coil 64 is provided on the stator support 4 and close to the moving brake disc 63.

[0028] Furthermore, the stator bracket 4 is provided with mounting holes 42 for the braking elastic element 65. One end of the braking elastic element 65 is disposed in the mounting hole 42, and the other end abuts against or is fixed to the moving brake disc 63. The stator bracket 4 is provided with at least three mounting holes 42, and the braking elastic element 65 is a brake spring. Generally, multiple mounting holes 42 are evenly provided in the circumferential direction on the side end of the stator bracket 4, and multiple brake springs are provided, so that the force exerted on the moving brake disc 63 is uniform.

[0029] The stator bracket 4 is provided with a mounting slot 41 for the excitation coil 64, and the excitation coil 64 is installed in the mounting slot 41.

[0030] like Figure 2As shown, when the excitation coil 64 is energized, the magnetic force it generates will attract the moving brake disc 63 to the side of the stator bracket 4. The moving brake disc 63 and the disc brake disc 61 are separated, so the electric vehicle is in a driving or moving state.

[0031] like Figure 5 As shown, when the excitation coil 64 is de-energized, the magnetic force disappears, and the moving brake disc 63 slides along the positioning bushing 67 toward the disc brake disc 61 under the elastic force of the braking elastic element 65. Under the elastic force of the braking elastic element 65, the moving brake disc 63 and the stationary brake disc 62 tightly clamp the disc brake disc 61, thus braking the electric vehicle.

[0032] Because the static brake disc 62 is fixed, the disc brake 61 is a floating disc brake; otherwise, the disc brake 61 would have a very short lifespan and poor braking performance. Figure 10 As shown, the butterfly brake disc 61 is fixedly connected to the housing 1 by bolts 91. An elastic washer 9 is provided between the bolts 91 and the butterfly brake disc 61, and the elastic washer 9 provides the butterfly brake disc 61 with a margin of movement.

[0033] Existing electric vehicles are locked up and cannot be pushed once the power is cut off, meaning the tires cannot turn. To push them, the wheel hubs must be removed to release the brakes.

[0034] This utility model also includes a manual brake release device, such as... Figure 6-8 As shown, it includes a brake release disc 71, an adjusting bolt 72, and a limiting elastic element 73 mounted on the motor shaft 5; the motor shaft 5 is provided with an oblong through-hole groove 8, such as... Figure 1 As shown, the end face of the motor shaft 5 located on one side of the stationary brake disc 62 is provided with an internal threaded hole, which communicates with the oblong through-hole groove 8. The brake release disc 71 is set in the oblong through-hole groove 8, and the adjusting bolt 72 passes through the internal threaded hole and connects to the brake release disc 71. The moving brake disc 63 is located between the brake release disc 71 and the stator bracket 4, that is, the brake release disc 71 is located between the moving brake disc 63 and the stationary brake disc 62; Figure 2 As shown, the limiting elastic element 73 is positioned between the stator bracket 4 and the brake release disc 71, holding the brake release disc 71 in place to prevent it from contacting the moving brake disc 63. When the electric vehicle is powered off and locked, the adjusting bolt 72 can be rotated inward to push the brake release disc 71 toward the moving brake disc 63, overcoming the resistance of the limiting elastic element 73 and squeezing the moving brake disc 63 toward the stator bracket 4. This separates the moving brake disc 63 from the disc brake 61, releasing the brake and allowing the tires to rotate.

[0035] Preferably, such as Figure 9As shown, in order to apply force evenly to the moving brake disc 63 and prevent deformation of the moving brake disc 63, a retaining ring 74 is provided between the brake release disc 71 and the moving brake disc 63. The retaining ring 74 is sleeved on the motor shaft 5, and a limiting elastic element 73 is provided between the stator bracket 4 and the retaining ring 74. The limiting elastic element 73 is a limiting spring, which is sleeved on the motor shaft 5. In this way, the force exerted by the brake release disc 71 on the moving brake disc 63 is evenly applied to the moving brake disc 63 by the retaining ring 74.

[0036] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. All equivalent changes and modifications made within the scope of the claims of this utility model should be considered within the technical scope of this utility model.

Claims

1. A hub motor with a built-in electromagnetic brake, comprising an electromagnetic brake, the hub motor further comprising a housing (1), a rotor (2), a stator (3), a stator support (4), a motor shaft (5), and two end caps (6) respectively covering the left and right ports of the housing (1), the stator (3) being disposed on the stator support (4), the stator support (4) being fixedly sleeved on the motor shaft (5); the rotor (2) being disposed on the inner wall of the housing (1); the housing (1) and the end caps (6) forming a motor cavity (10); the electromagnetic brake being disposed inside the motor cavity (10); Its features are: The electromagnetic brake is installed in the motor cavity (10) between the stator support (4) and one end cover (6). It includes a disc brake (61), a stationary brake (62), and a moving brake (63). The disc brake (61) is fixedly installed inside the housing (1). The stationary brake (62) and the moving brake (63) are sleeved on the motor shaft (5) and located on both sides of the disc brake (61). The stationary brake (62) is located on one side near the inner wall of the end cover (6), and the moving brake (63) is located near the stator support (4). On the side; the stationary brake disc (62) is fixedly mounted on the stator support (4) by a fixing component, and the moving brake disc (63) is slidably mounted on the fixing component; a braking elastic element (65) and an excitation coil (64) are also provided. One end of the braking elastic element (65) is mounted on the stator support (4), and the other end is pressed against or fixed to the moving brake disc (63). The braking elastic element (65) is located between the moving brake disc (63) and the stator support (4); the excitation coil (64) is mounted on the stator support (4) and close to the moving brake disc (63).

2. The hub motor with a built-in electromagnetic brake as described in claim 1, characterized in that: The stator bracket (4) is provided with mounting holes (42) for the brake elastic element (65). One end of the brake elastic element (65) is set in the mounting hole (42), and the other end is pressed against or fixed to the dynamic brake disc (63).

3. The hub motor with a built-in electromagnetic brake as described in claim 2, characterized in that: The stator bracket (4) is provided with at least three mounting holes (42), the brake elastic element (65) is a brake spring, and the moving brake disc (63) is made of magnetic material.

4. The hub motor with a built-in electromagnetic brake as described in claim 1, characterized in that: The stator bracket (4) is provided with a mounting slot (41) for the excitation coil (64), and the excitation coil (64) is installed in the mounting slot (41).

5. The hub motor with a built-in electromagnetic brake as described in claim 1, characterized in that: The fixing component that fixes the static brake disc (62) to the stator bracket (4) is the positioning bolt (66), and the moving brake disc (63) is slidably sleeved on the positioning bolt (66); at least three positioning bolts (66) are provided.

6. The hub motor with a built-in electromagnetic brake as described in claim 5, characterized in that: The positioning bolt (66) is fitted with a positioning bushing (67). One end of the positioning bushing (67) abuts against the stationary brake disc (62), and the other end abuts against the stator bracket (4). The moving brake disc (63) is slidably fitted on the positioning bushing (67).

7. The hub motor with a built-in electromagnetic brake as described in claim 1, characterized in that: It is also equipped with a manual brake release device, including a brake release disc (71), an adjusting bolt (72) and a limiting elastic element (73) set on the motor shaft (5); a waist-shaped through hole groove (8) is provided on the motor shaft (5), and an internal thread hole is provided on the end face of the motor shaft (5) located on the side of the stationary brake disc (62). The internal thread hole is connected to the waist-shaped through hole groove (8). The brake release disc (71) is set in the waist-shaped through hole groove (8). The adjusting bolt (72) passes through the internal thread hole and is connected to the brake release disc (71). The moving brake disc (63) is located between the brake release disc (71) and the stator support (4); the limiting elastic element (73) is set between the stator support (4) and the brake release disc (71).

8. The hub motor with a built-in electromagnetic brake as described in claim 7, characterized in that: A retaining ring (74) is provided between the brake release disc (71) and the moving brake disc (63). The retaining ring (74) is sleeved on the motor shaft (5). The limiting elastic element (73) is provided between the stator bracket (4) and the retaining ring (74).

9. The hub motor with a built-in electromagnetic brake as described in claim 8, characterized in that: The limiting elastic element (73) is a limiting spring, which is sleeved on the motor shaft (5).

10. The hub motor with a built-in electromagnetic brake as described in claim 1, characterized in that: The disc brake (61) is fixedly connected to the housing (1) by bolts (91), and an elastic washer (9) is provided between the bolts (91) and the disc brake (61).

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