Cooling motor with temperature protection function

Abstract

This invention relates to the field of aircraft wheel brake cooling technology, specifically to a cooling motor with temperature protection function, comprising: a housing assembly, a stator assembly, a rotor assembly, and an elastic component; one end of the housing assembly is adapted to the interior of the wheel axle, and the other end of the housing assembly is provided with a socket; the stator assembly is disposed within the housing assembly and is electrically connected to the socket via a thermal protection switch assembly; the thermal protection switch assembly is used to automatically disconnect when the temperature is abnormal, stopping the motor from working; the rotor assembly is coaxially disposed within the stator assembly and is rotatably disposed within the housing assembly along the same axis via a bearing, with the output shaft of the rotor assembly extending out of the housing assembly at the end opposite to the socket; the elastic component is disposed between the bearing at the end away from the socket and the inner wall of the bearing mounting groove within the housing assembly. This invention achieves overheat protection for the cooling motor, preventing damage caused by excessively high motor temperatures.

Description

Technical Field

[0001] This invention relates to the field of aircraft wheel brake cooling technology, specifically to a cooling motor with temperature protection function. Background Technology

[0002] When an aircraft with wheel brakes lands, the braking action generates a large amount of heat. It must wait until the brake temperature drops to a safe level before taking off again. However, the cooling time for wheel brakes is often very long. Without a brake cooling system, this would increase the aircraft's turnaround time. Furthermore, during takeoff and landing taxiing, multiple braking maneuvers can also cause the aircraft's brake temperature to become too high, preventing it from reaching takeoff conditions. Current aircraft brake cooling methods rely on ground-based auxiliary equipment, such as air-conditioned vehicles. If some airports lack these vehicles, the aircraft's turnaround time will be extended, significantly reducing operational efficiency. To address these issues, a novel split-type irregularly shaped cooling motor has been invented to solve this problem.

[0003] The existing three-phase asynchronous motor structure includes a socket, a motor rear cover assembly, a housing rear cover assembly, a disc spring, a first bearing, a second bearing, a stator assembly, a rotor assembly, and a front cover assembly. This three-phase asynchronous motor structure can meet the requirements for a motor used for cooling and driving landing gear brakes. This technology significantly improves energy conversion efficiency through the design of the motor stator and rotor structures. However, the brake cooling motor is installed inside the landing gear wheel axle and operates in a high-temperature environment of approximately 200°C for extended periods, which may cause overheating damage to the stator assembly. Furthermore, the brake cooling motor also operates in a vibration and shock environment, and this motor does not have a buffer device at the bearing end on the rotor assembly; the bearing directly impacts the housing, which can cause bearing damage over time.

[0004] Therefore, a cooling motor with temperature protection function is needed to solve the above problems. Summary of the Invention

[0005] In the existing technology, the brake cooling motor is installed inside the landing gear wheel axle and operates in a high-temperature environment of about 200°C for a long time, which may cause the stator assembly to overheat and be damaged. On the other hand, the brake cooling motor also operates in a vibration and impact environment, and the motor does not have a buffer device on the bearing end of the rotor assembly. The bearing directly impacts the housing, which will cause damage to the motor bearing after long-term operation. The present invention provides a cooling motor with temperature protection function to solve the existing problems.

[0006] The first aspect of this invention provides a cooling motor with temperature protection function, employing the following technical solution, including: The housing assembly has one end for internal fitting with the wheel axle, and the other end is provided with a socket; The stator assembly is housed within the housing assembly and is electrically connected to the socket via a thermal protection switch assembly; the thermal protection switch assembly is used to automatically disconnect and stop the motor when the temperature is abnormal. The rotor assembly is coaxially disposed within the stator assembly and is rotatably disposed within the housing assembly along the housing assembly via bearings. The output shaft of the rotor assembly extends out of the housing assembly at the end opposite to the socket. And a resilient component, which is disposed between the bearing at the end away from the socket and the inner wall of the bearing mounting groove in the housing assembly.

[0007] A further technical solution of the present invention is that the housing assembly includes a front housing and a rear housing, the ends of the front housing and the rear housing are connected by screws; wherein, the stator assembly is coaxially fixed inside the rear housing, the front housing is used to be internally adapted to the wheel axle, and the socket is provided at the end of the rear housing opposite to the front housing.

[0008] A further technical solution of the present invention is that a bracket is connected to one end of the rear housing away from the front housing, wherein the socket is disposed on the bracket.

[0009] A further technical solution of the present invention is that both the front housing and the rear housing are provided with weight reduction grooves, wherein a rectangular groove is provided in the circumferential direction of the rear housing near the end of the front housing, and the rectangular groove is used to reserve a position for installing the thermal protection switch assembly.

[0010] A further technical solution of the present invention is that the thermal protection switch assembly is a mechanical switch structure, which contains a thermal sensitive element. One end of the thermal sensitive element is fixed, and the other end of the thermal sensitive element is connected to the contact of the switch. When the temperature exceeds the disconnection temperature threshold, the thermal sensitive element bends and deforms to automatically push the contact, causing the thermal protection switch assembly to automatically disconnect and the motor to stop working. When the temperature is lower than the recovery temperature threshold, the thermal sensitive element returns to its original shape and drives the contact to move, causing the thermal protection switch assembly to automatically close and the motor to return to its initial state.

[0011] A further technical solution of the present invention is that the elastic component includes: a multi-layer wave spring, which is disposed between the bearing at the end away from the socket and the inner wall of the bearing mounting groove in the housing assembly.

[0012] A further technical solution of the present invention is that the front housing is made of stainless steel and the rear housing is made of aluminum alloy.

[0013] A further technical solution of the present invention is that the bearing is a sealed bearing.

[0014] The beneficial effects of this invention are: 1. Based on the working environment of the brake cooling motor, this invention connects two thermal protection switch assemblies in series on the two-phase windings of the motor's stator assembly, and ensures that the two thermal protection switch assemblies are in close contact with the stator windings. The switches automatically disconnect when the motor temperature is too high and automatically reconnect when the temperature drops, thus achieving overheat protection for the cooling motor and preventing damage caused by excessive motor temperature. Simultaneously, an elastic component is installed between the bearing on the output shaft of the cooling motor and the inner wall of the bearing mounting groove. This elastic component provides initial preload to the rotor assembly and reduces bearing impact, effectively improving bearing life and reducing noise.

[0015] 2. Existing cooling motors all use a motor body + external adapter configuration, while the motor housing of this invention is an irregular structure formed by connecting a front housing and a rear housing. That is, the rear housing serves as the outer shell of the motor, and the front housing serves as the external adapter. This adapts to the installation space while providing support for the stator and rotor assemblies. Furthermore, both the front and rear housings have weight-reduction grooves, thereby effectively reducing the weight of the motor. The cooling motor housing adopts a split design of the front and rear housings, which is simple to operate, convenient for installation and disassembly, and can effectively shorten the maintenance cycle. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of a cooling motor with temperature protection function according to the present invention; Figure 2 This is a cross-sectional view of a cooling motor with temperature protection function according to the present invention; Figure 3 This is a schematic diagram of the installation of the thermal protection switch assembly in the cooling motor according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the installation of multi-layer wave springs in a cooling motor according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the front housing of the cooling motor in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the rear housing of the cooling motor in an embodiment of the present invention.

[0018] In the diagram: 1. Front housing; 2. Rear housing; 3. Wave spring; 4. Thermal protection switch assembly; 5. Stator assembly; 6. Rotor assembly; 7. Front bearing; 8. Rear bearing; 9. Bracket; 10. Cable; 11. Socket. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] An embodiment of the present invention, a cooling motor with temperature protection function, is as follows: Figure 1 As shown, it includes: a housing assembly, a stator assembly 5, a rotor assembly 6, and an elastic component; one end of the housing assembly is used for internal adaptation with the wheel axle, and the other end of the housing assembly is provided with a socket 11; the stator assembly 5 is disposed inside the housing assembly, and the stator assembly 5 is electrically connected to the socket 11 through a thermal protection switch assembly 4. In this embodiment, the socket 11 is connected to the winding of the stator assembly 5 through a cable 10, that is, the cable 10 extends through the outer circumference of the rear housing 2 to the rear end of the cooling motor, and the thermal protection switch assembly 4 is connected between the cable 10 and the winding. The thermal protection switch assembly 4 is used to automatically disconnect when the temperature is abnormal, and the motor stops working; the rotor assembly 6 is coaxially disposed inside the stator assembly, and the rotor assembly 6 is coaxially and rotatably disposed inside the housing assembly through a bearing, specifically, as shown in... Figure 2 As shown, in this embodiment, the rotor assembly 6 is provided with two bearings, namely a front bearing 7 and a rear bearing 8. The front bearing 7 is installed at the front end of the output shaft of the rotor assembly 6, and the rear bearing 8 is installed at the rear end of the output shaft of the rotor assembly 6. A small air gap is left between the rotor assembly 6 and the stator assembly 5, which can effectively reduce electromagnetic loss. The output shaft of the rotor assembly extends out of the housing assembly at the end away from the socket 11. The elastic component is disposed between the bearing at the end away from the socket 11 and the inner wall of the bearing mounting groove in the housing assembly.

[0021] For example, such as Figure 1 and Figure 2 As shown, in one specific embodiment, the housing assembly includes: a front housing 1 and a rear housing 2, the ends of which are connected by screws to form an irregularly shaped outer shell for cooling the motor; wherein, as... Figure 2 As shown, the stator assembly 5 is coaxially fixed to the rear housing 2 by set screws to prevent the stator assembly 5 from rotating or moving axially inside the rear housing 2. The front housing 1 is used for internal adaptation with the wheel axle, and the socket 11 is located at the end of the rear housing 2 opposite to the front housing 1. Specifically, the front housing 1 is made of stainless steel to ensure the structural strength of the cooling motor, and the rear housing 2 is made of high-strength aluminum alloy. Furthermore, as... Figure 4 and Figure 5As shown, both the front housing 1 and the rear housing 2 are provided with weight-reducing grooves to effectively reduce the weight of the cooling motor while ensuring strength.

[0022] For example, in one specific embodiment, a bracket 9 is connected to the end of the rear housing 2 opposite to the front housing 1. That is, the rear housing 2 has a threaded hole, and the bracket 9 is fixed to the rear housing 2 by screws. The bracket 9 is made of stainless steel and is lightweight while ensuring structural strength. The bracket 9 has a reserved electrical connector interface for installing a socket 11 for the motor. The socket 11 is connected to the windings on the stator assembly 11 via a cable 10.

[0023] For example, in one specific embodiment, both the front housing 1 and the rear housing 2 are provided with weight-reduction grooves, wherein, as shown... Figure 6 As shown, a rectangular groove is provided circumferentially at one end of the rear housing 2 near the front housing 1. The rectangular groove is used to reserve a position for installing the thermal protection switch assembly 4.

[0024] For example, in one specific embodiment, the thermal protection switch assembly 4 is a mechanical switch structure, which contains a heat-sensitive element. One end of the heat-sensitive element is fixed, and the other end is connected to the switch contact. When the temperature exceeds the disconnection temperature threshold, the heat-sensitive element bends and deforms to automatically push the contact, causing the thermal protection switch assembly 4 to automatically disconnect, and the motor stops working. When the temperature is lower than the recovery temperature threshold, the heat-sensitive element returns to its original shape, causing the contact to move and causing the thermal protection switch assembly 4 to automatically close, and the motor returns to its initial state. Figure 3 As shown, in this embodiment, two thermal protection switch assemblies 4 are provided, and the two thermal protection switch assemblies 4 are respectively connected in series to the two windings of the stator assembly 5.

[0025] For example, in one specific embodiment, the elastic component includes a multi-layer wave spring 3, which is disposed between the bearing at the end away from the socket 11 and the inner wall of the bearing mounting groove in the housing assembly. In this embodiment, the front bearing 7 is installed in the bearing mounting groove on the front housing 1, and the rear bearing 8 is installed in the bearing mounting groove on the rear housing 2. That is, the multi-layer wave spring 3 is disposed between the front bearing 7 and the inner wall of the bearing mounting groove in the front housing 1. Both the front bearing 7 and the rear bearing 8 are sealed bearings to prevent foreign objects from entering the interior of the stator assembly 5 and causing damage to the motor. It should be noted that the purpose of setting the multi-layer wave spring 3 is to provide preload for the bearing and to prevent the bearing from directly impacting the housing and causing damage in a vibration environment. In this embodiment, the spring wire of the multi-layer wave spring 3 is designed with a wave-like structure. When subjected to external force, the protruding spring wire deforms under the force, converting part of the impact kinetic energy into elastic potential energy, thus preventing the bearing from directly impacting the inner wall of the front housing 1 and causing damage. Working principle refer to Figure 1 , Figure 2 This invention discloses a cooling motor with temperature protection. By incorporating a thermal protection switch assembly 4, the power supply can be disconnected when the motor temperature is abnormal, preventing overheating and damage. Additionally, multi-layered wave springs are installed between the front bearing and the front housing of the motor, providing initial preload to the rotor assembly and mitigating bearing impact, effectively improving bearing life and reducing noise. After the cooling motor is powered on via socket 11, the stator assembly 5 is energized, forming a rotating magnetic field. Under the principle of electromagnetic induction, this drives the rotor assembly 6 to rotate. The cooling motor works in conjunction with a fan to provide braking and cooling. Furthermore, this motor adopts a split-shell structure, breaking away from conventional cooling motor designs and significantly reducing overall weight.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cooling motor with temperature protection function, characterized in that, include: The housing assembly has one end for internal fitting with the wheel axle, and the other end is provided with a socket; The stator assembly is housed within the housing assembly and is electrically connected to the socket via a thermal protection switch assembly; the thermal protection switch assembly is used to automatically disconnect and stop the motor when the temperature is abnormal. The rotor assembly is coaxially disposed within the stator assembly and is rotatably disposed within the housing assembly along the housing assembly via bearings. The output shaft of the rotor assembly extends out of the housing assembly at the end opposite to the socket. And a resilient component, which is disposed between the bearing at the end away from the socket and the inner wall of the bearing mounting groove in the housing assembly.

2. A cooling motor with temperature protection function according to claim 1, characterized in that, The housing assembly includes a front housing and a rear housing, the ends of which are connected by screws; wherein, the stator assembly is coaxially fixed inside the rear housing, the front housing is used for internal adaptation with the wheel axle, and the socket is provided at the end of the rear housing opposite to the front housing.

3. A cooling motor with temperature protection function according to claim 2, characterized in that, A bracket is connected to the end of the rear housing that is away from the front housing, and the socket is located on the bracket.

4. A cooling motor with temperature protection function according to claim 1, characterized in that, Both the front and rear housings are provided with weight reduction grooves. The rear housing has a rectangular groove circumferentially opened near the end of the front housing. The rectangular groove is used to reserve a position for the installation of the thermal protection switch assembly.

5. A cooling motor with temperature protection function according to claim 1, characterized in that, The thermal protection switch assembly is a mechanical switch structure with a heat-sensitive element inside. One end of the heat-sensitive element is fixed, and the other end is connected to the switch contact. When the temperature exceeds the disconnection temperature threshold, the heat-sensitive element bends and deforms to automatically push the contact, causing the thermal protection switch assembly to automatically disconnect and the motor to stop working. When the temperature is lower than the recovery temperature threshold, the heat-sensitive element returns to its original shape, causing the contact to move and the thermal protection switch assembly to automatically close, and the motor returns to its initial state.

6. A cooling motor with temperature protection function according to claim 1, characterized in that, The elastic component includes a multi-layered wave spring, which is disposed between the bearing at the end away from the socket and the inner wall of the bearing mounting groove within the housing assembly.

7. A cooling motor with temperature protection function according to claim 2, characterized in that, The front housing is made of stainless steel, while the rear housing is made of aluminum alloy.

8. A cooling motor with temperature protection function according to claim 1, characterized in that, The bearing is a sealed bearing.

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