Active air-cooled brake device for aircraft wheels

Abstract

The application discloses an active air-cooled brake device for an aviation wheel and particularly relates to the field of aviation machinery. The device comprises a brake shell, a heat sink, a cylinder seat assembly and a bearing which are sequentially sleeved on the brake shell, a first gear and a fan which are sequentially sleeved on the bearing and are connected, a motor fixed on the side wall of the cylinder seat assembly, a second gear in transmission connection with the output shaft of the motor and in engagement with the first gear. Based on the above brake device, the high-temperature hot air flow in the reverse direction can be avoided from causing thermal deformation of the piston or influencing the stability of the hydraulic medium during the cooling operation.

Description

Technical Field

[0001] This application relates to the field of aviation machinery, and in particular to an active air-cooled braking device for aircraft wheels. Background Technology

[0002] The aircraft wheel braking system is a critical component during taxiing, turning, takeoff, and landing braking. It generates braking torque through the friction between brake discs, converting the aircraft's kinetic energy into internal energy to bring it to a stop within a certain distance. During braking, the friction between the moving and stationary discs generates a significant amount of heat, affecting the wheel structure, tire life, and the aircraft's restart time. Therefore, the brake discs must be cooled as quickly as possible after braking. While the outer surface of the brake discs dissipates heat directly through air convection, the brake discs used in the heat storage assembly are made of carbon fiber composite material, which has poor thermal conductivity. This prevents the heat from being quickly dissipated from the inner surface of the brake discs, resulting in a slower temperature drop inside the heat storage assembly. This significantly impacts the aircraft's takeoff and landing efficiency and the lifespan of the aircraft wheels.

[0003] Currently, to reduce the adverse effects of excessively high brake temperatures on aircraft, engineering applications generally involve installing cooling fans on the outside of the aircraft wheels. Airflow is conducted to the braking system through weight-reduction holes in the spokes to dissipate heat. This method has two significant drawbacks: first, the airflow through the fan is affected by the area of ​​the weight-reduction holes in the spokes; second, the airflow direction is from the brake disc to the cylinder block assembly. The high-temperature airflow that first passes through the brake disc can affect the thermal deformation of the piston and the stability of the hydraulic fluid when it comes into contact with the cylinder block assembly. Summary of the Invention

[0004] The main objective of this application is to provide an active air-cooled braking device for aircraft wheels, which aims to solve the problem that existing cooling devices are prone to causing cylinder block assembly failure.

[0005] To achieve the above objectives, this application provides an active air-cooled braking device for aircraft wheels, including a brake housing, on which a heat sink, a cylinder block assembly, and a bearing are sequentially fitted; a first gear and a fan are sequentially fitted on the bearing, and the first gear and the fan are connected; a motor is fixed on the side wall of the cylinder block assembly, and the output shaft of the motor is driven by a second gear, which meshes with the first gear.

[0006] Optionally, it also includes an air collector shroud, which is connected to the hub of the wheel and located outside the fan.

[0007] Optionally, the brake housing includes a limiting plate, which is sequentially connected to a first cylinder, a second cylinder, and a third cylinder, with the outer diameters of the first, second, and third cylinders decreasing sequentially; the heat storage is fitted onto the first cylinder, the cylinder seat assembly is fitted onto the second cylinder, and the bearing is fitted onto the third cylinder.

[0008] Optionally, the fan includes a ring sleeve with multiple fan blades connected circumferentially along the ring sleeve; the ring sleeve is fitted onto the bearing and connected to the first gear via a connector.

[0009] Optionally, the connector includes multiple keys, which are distributed sequentially along the end face of the first gear in the circumferential direction, and a keyway adapted to the keys is provided on the outer wall of the ring sleeve.

[0010] Compared with the prior art, the beneficial effects of this application are as follows: The active air-cooled braking device for aircraft wheels of the present invention uses a fan sleeved on the brake housing via a bearing, located on the landing gear shaft near the cylinder block assembly. During cooling operations, the airflow first passes through the slightly cooler piston before reaching the high-temperature heat storage assembly, avoiding thermal deformation of the piston or affecting the stability of the hydraulic medium caused by the hot airflow blowing in the opposite direction. Furthermore, the airflow is not affected by the size of the weight reduction holes in the spokes or by the obstruction of the brake device itself, allowing the hot air inside the cavity to be quickly discharged, greatly shortening the temperature drop time of the heat storage assembly and improving cooling efficiency. By fixing the motor to the horizontal end of the cylinder block assembly, the fan is driven to rotate via the second gear and the first gear, thereby achieving the cooling operation of the brake device without interfering with the piston's operation of the heat storage assembly or affecting the output of the braking torque. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of an active air-cooled braking device for aircraft wheels according to this application; Figure 2 for Figure 1 Exploded view; Figure 3 A schematic diagram of the brake main wheel assembly; Figure 4 This is a schematic diagram showing the installation on the landing gear axle; Figure 5 This is a schematic diagram of the brake housing.

[0012] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0014] The first embodiment of the present invention provides an active air-cooled braking device for aircraft wheels, such as... Figure 1-3As shown, the device includes a brake housing 1, on which a heat sink 2, a cylinder block assembly 3, and a bearing 4 are sequentially mounted; a first gear 5 and a fan 6 are sequentially mounted on the bearing 4, and the first gear 5 and the fan 6 are connected; a motor 7 is fixed on the side wall of the cylinder block assembly 3, and the output shaft of the motor is driven by a second gear 8, which meshes with the first gear 5.

[0015] Understandably, the cylinder block assembly 3 includes a cylinder block and a piston. During operation, braking is achieved through the cooperation of the heat storage 2 with the wheel assembly and the brake housing 1. During braking, the airflow generated by the rotation of the fan 6 passes through the piston and the heat storage 2 in sequence and is discharged to achieve cooling.

[0016] In this embodiment, the fan 6 is sleeved on the brake housing 1 via the bearing 4 and is located at the end of the landing gear shaft near the cylinder block assembly. During cooling operations, the airflow will first pass through the piston, which has a slightly lower temperature, before reaching the high-temperature heat storage 2 assembly. This avoids the high-temperature hot airflow from blowing in the opposite direction causing thermal deformation of the piston or affecting the stability of the hydraulic medium. Furthermore, the airflow is not affected by the size of the weight reduction holes in the spokes or by the obstruction of the brake device itself, allowing the hot air in the cavity to be quickly discharged, greatly shortening the temperature drop time of the heat storage 2 assembly and improving cooling efficiency. By fixing the motor to the horizontal end of the cylinder block assembly, the fan 6 is driven to rotate via the second gear 8 and the first gear 5, thereby achieving the cooling operation of the brake device without interfering with the piston's operation of the heat storage 2 assembly or affecting the output of the braking torque.

[0017] Furthermore, such as Figure 4 As shown, it also includes a fan shroud 9, which is connected to the hub of the wheel assembly 10 and located outside the fan 6. The fan shroud 9 is machined from 3A21 aluminum alloy and is attached to the wheel hub by four sets of M6 screws.

[0018] For example, such as Figure 5 As shown, the brake housing 1 includes a limiting plate 11, which is sequentially connected to a first cylinder 12, a second cylinder 13, and a third cylinder 14, with the outer diameters of the first cylinder 12, second cylinder 13, and third cylinder 14 decreasing sequentially. A heat sink 2 is fitted onto the first cylinder 12, a cylinder seat assembly 3 is fitted onto the second cylinder 13, and a bearing 4 is fitted onto the third cylinder 14. For example, the axial length of the brake housing 1 is 350 mm, the outer diameters of the first cylinder 12, second cylinder 13, and third cylinder 14 are 280 mm, 255 mm, and 205 mm, respectively, and the wall thicknesses are 13 mm, 9.5 mm, and 5 mm, respectively. Six sets of pressure cups are distributed circumferentially on the outer side of the first cylinder 12 to limit the displacement of the heat sink 2, and eight M10 threaded holes are distributed circumferentially on the stepped surface formed by the first cylinder 12 and second cylinder 13 for connecting the cylinder seat assembly.

[0019] This embodiment takes into account that moving the fan to the same side as the cylinder block would significantly reduce the space for the motor and fan blades on the cylinder block if the same diameter brake housing were used, resulting in a serious waste of the internal volume of the impeller. Therefore, the brake housing 1 in this embodiment has a variable diameter, which has the advantages of: ample space for the structural design of the motor, transmission gears, and fan blades; and avoidance of wasted internal volume of the impeller, saving space.

[0020] For example, the cylinder block is machined from 2A14 aluminum alloy. The outer diameter of the cylinder block is selected according to the piston diameter, and the inner diameter is 255mm. Eight M10 threaded holes are distributed circumferentially on the cylinder block wall, and eight screws are fitted to them. The screws are fixed in place with the threaded holes on the stepped surface formed by the first cylinder 12 and the second cylinder 13.

[0021] Furthermore, the fan 6 includes a ring 61, with multiple fan blades 62 connected circumferentially along the ring 61. The ring 61 is fitted onto the bearing 4 and connected to the first gear 5 via a connector. For example, the connector includes multiple keys, which are sequentially distributed along the end face of the first gear 5 circumferentially. A keyway adapted to the keys is provided on the outer wall of the ring 61. The fan 6 is machined from 2A14 aluminum alloy, the size of the fan blades 62 is determined according to the selected inner cavity volume of the impeller, and the bore diameter of the ring 61 is 225mm.

[0022] In an exemplary embodiment, the motor can be a Mitsubishi HG-KR23 motor, mounted on the horizontal wall of the cylinder block assembly using four sets of M6 screws. The motor shaft and the second gear 8 are connected by a key to transmit rotational speed. The bearing 4 is a non-standard deep groove ball bearing 4 with an outer diameter of 225mm and an inner diameter of 205mm. The inner ring of the bearing 4 is mounted on the third cylinder 14. The first gear 5 is machined from TC11 titanium alloy. The number of teeth and module of the first gear 5 can be selected according to the motor speed. The mounting hole diameter of the first gear 5 is 225mm, and it is installed in conjunction with the bearing 4. The second gear 8 is also machined from TC11 titanium alloy. The number of teeth and module of the second gear 8 can be selected according to the motor speed. The mounting hole diameter of the second gear 8 is determined by the diameter of the motor shaft. The second gear 8 is fixed to the motor shaft by a key connection. The meshing of the second gear 8 and the first gear 5 transmits torque to the fan blade 62, causing the fan blade 62 to rotate at high speed and quickly expel the high temperature inside the brake device cavity to the outside.

[0023] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. An active air-cooled braking device for aircraft wheels, characterized in that, include: A brake housing, on which a heat sink, a cylinder block assembly, and a bearing are sequentially fitted; A first gear and a fan are sequentially fitted onto the bearing, and the first gear and the fan are connected. A motor is fixed on the side wall of the cylinder block assembly, and the output shaft of the motor is driven by a second gear, which meshes with the first gear.

2. The active air-cooled braking device for aircraft wheels according to claim 1, characterized in that, It also includes a fan shroud, which is connected to the hub of the wheel and located outside the fan.

3. The active air-cooled braking device for aircraft wheels according to claim 1, characterized in that, The brake housing includes a limiting plate, and the limiting plate is sequentially connected to a first cylinder, a second cylinder, and a third cylinder, the outer diameters of the first cylinder, the second cylinder, and the third cylinder decreasing sequentially. The heat storage chamber is fitted onto the first cylinder, the cylinder seat assembly is fitted onto the second cylinder, and the bearing is fitted onto the third cylinder.

4. The active air-cooled braking device for aircraft wheels according to claim 1, characterized in that, The fan includes a ring sleeve, and multiple fan blades are connected circumferentially along the ring sleeve; The ring sleeve is fitted onto the bearing, and the ring sleeve is connected to the first gear through a connector.

5. The active air-cooled braking device for aircraft wheels according to claim 4, characterized in that, The connector includes multiple keys, which are distributed sequentially along the end face of the first gear in the circumferential direction. The outer wall of the ring sleeve is provided with a keyway that matches the keys.

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