Electromechanical drive unit for aircraft main landing gear wheel disc brake

FIELD: transport.

SUBSTANCE: invention relates to air transport, specifically to electromechanical drives of aircraft brakes. The unit consists of two modules installed on flange fixed on wheel axle. Each of the modules has body, thrust plunger, screw mechanism located in the body, electric motor connected with screw drive reducing gear. In the inside axial cavity of the screw, electric motor with rotor is installed. On one of electric motor shaft ends, wave former of the first stage of double-stage harmonic reducing gear and wave former incorporating separator of the first stage of harmonic reducing gear are placed. The separator is connected with electric motor body and has the first intermediate rotation bodies interacting with separator incorporating rigid wheel, with inner waved surface. Rigid wheel of the second stage has shaft installed coaxially with electric motor rotor which shaft has wave former of the second stage of harmonic reducing gear, with separator connected with electric motor body which separator has the second intermediate rotation bodies. Part of screw surface incorporating harmonic reducing gear second stage wave former has inside waved surface.

EFFECT: decreased unit dimensions, higher unit efficiency and reliability.

4 cl, 4 dwg

 

The invention relates to electrical engineering and can be applied to the actuators of the brake systems of aircraft.

A device of the Electromechanical drive brakes wheels of the aircraft (application WO No. 01/20188 A1 from 13.09.1999; US patent No. 6581730 B1 from 12.09.2000)consisting of a set of several modules Electromechanical actuator on the support wheels of the main landing gear that are used to create the normal force acting on the disc brake. Each module of the Electromechanical drive is installed in a single housing erikoistuvia mechanism converting the rotational motion of the screw in the forward movement of the nut with pressure Cup and Electromechanical screw drive comprising a motor and gear reducer, with the axis of the motor shaft is perpendicular to the axis erikoistuvia mechanism.

A disadvantage of the known device is its large size and weight, as well as the inconvenience of mounting and Dismounting.

Known drive electromechanism (RU # 2277195 C2 from 07.02.2003) to drive a variety of devices in aircraft, consisting of a set in a single package erikoistuvia mechanism converting the rotational motion of the screw in the forward movement of the nut. The screw is rotationally driven by an electric motor, the axis of which RA is placed parallel to the axis of the screw mechanism, through the planetary gear reducer.

The disadvantage of this electrically driven mechanism in its large size and weight, and low efficiency.

Known module Electromechanical actuator disc brakes landing gear of the aircraft (patent EP No. 093637357 from 12.02.1999). The actuator includes a housing, a plunger with an internal screw thread located in the housing and engaged translational motion while rotating inside screw driven through a gear reducer motor, the axis of which is parallel to the axis and direction of translational movement of the plunger.

Several modules Electromechanical actuator fixed to the flange mounted on the wheel axis.

The disadvantage of such an Electromechanical actuator in the complexity of its design, the design of the flange and the complexity of its installation and maintenance.

A device of the Electromechanical actuator of the braking system of the aircraft (application US No. 2011/0132704 A1 from 26.03.2010).

The device consists of a accommodated in the housing erikoistuvia mechanism, a nut which has two radial bearings and rests on the thrust bearing. The screw is hollow and performs translational motion during rotation of the nut. Nut is rotationally driven via accommodated in the housing of gear reducer elek what radigales, axis which is parallel to the axis erikoistuvia mechanism.

The disadvantage of this device is its complexity, large size and low efficiency due to low efficiency multi-stage gear reducer.

The technical problem of the invention is to reduce the size of the device and increase its reliability and efficiency.

The technical problem is solved in a device of the Electromechanical drive of the disk brake of a wheel of the main landing gear of the aircraft, comprising at least two modules Electromechanical transmission installed on a flange fixed to the wheel axis, each of which has a body, push the plunger acting on the brake disc; located in the housing screw mechanism, a screw which is mounted in a radial-thrust bearing and leaning his face on the thrust bearing has an inner axial cavity and the nut has a lock, excluding its rotation relative to the housing; a motor connected to the drive gear screw, while in the inner the axial cavity of the screw set: electric motor with a rotor at one end of the shaft which is placed volnoobrazovaniye the first stage of two-stage wave gear covering volnoobrazovaniye separator first stage of the wave gear connected to a motor housing having a first body rotation system-easy installation the I, interacting with covering the separator rigid wheel with internal wave surface; a rigid wheel of the second stage is mounted coaxially with the rotor of the motor shaft with volnoobrazovaniye second stage of the wave gear connected to the motor housing separator having a second intermediate body rotation, and the portion of the surface of the screw, covering volnoobrazovaniye second stage of the wave gear has internal wave surface.

To improve the reliability of the Electromechanical drive motor is a brushless, direct current, variable speed rotation of the rotor.

To reduce the size of the Electromechanical drive and increase its efficiency maximum frequency of rotation of the rotor of the electric motor is in the range of 7000...20000 min-1.

To increase and uniform distribution of the total force pressing plungers to push the disk in the flange fixed to the wheel axis can be set up to nine modules Electromechanical transmission of the proposed design, which is not possible using the known structural modules.

Effect : reduce the size of the device and improving its efficiency is achieved through a range of new features:

in the inner axial cavity of wintersteller: electric motor with a rotor, at one end of the shaft which is placed volnoobrazovaniye the first stage of two-stage wave gear covering volnoobrazovaniye separator first stage of the wave reduction gear connected to the motor housing, with the first intermediate body rotation, interacting with covering the separator rigid wheel with internal wave surface at the same time tight wheel of the second stage is mounted coaxially with the rotor of the motor shaft with volnoobrazovaniye second stage of the wave gear connected to the motor housing separator having a second body of rotation, and the portion of the surface of the screw, covering volnoobrazovaniye second stage of the wave gear has internal wave surface;

the motor is a brushless, direct current, variable speed rotation of the rotor;

the maximum frequency of rotation of the rotor of the electric motor is in the range of 7000...20000 min-1;

in the flange fixed to the wheel axis, is set to nine modules Electromechanical transmission.

Distinguishing signs or symptoms that they are equivalent is not found in the scientific, technical and patent information that demonstrates compliance with the invention, the criterion of "novelty".

The set of distinctive features is not what eduit explicitly in the prior art, therefore, the invention meets the criterion of "inventive step".

Figure 1 shows the design of the Electromechanical actuator disc brakes.

Figure 2 is a view As in figure 1, showing the placement of six modules Electromechanical actuator in the flange of the disk brake.

Figure 3 - module design of the Electromechanical drive.

Figure 4 - cross section b-b In figure 3.

The Electromechanical drive device of the disk brake 1 of the wheel of the main landing gear of the plane (Fig.1-4) consists of at least two modules 2 mounted on the flange 3 axis 4 of the wheel; each module 2 has a housing 5, a pressure plunger 6, acting on the disk 7 brake 1; located in the housing 5 screw mechanism 8, the screw 9 which is mounted in a radial-axial bearing 10 and leaning his face on the thrust bearing 11 has an internal axial cavity 12 and the nut 13 has a groove 14 for the end of the stopper 15, posted the housing 5 and precluding rotation of the nut 13 relative to the housing 5; a motor 16 connected with the gear 17 of the drive screw 9, while in the inner axial cavity 12 of the screw 9 mounted motor 16 with the rotor 18, at one end of the shaft 19, which is placed volnoobrazovaniye 20 of the first stage 21 two-wave reduction gear 17; covering volnoobrazovaniye 20 separator 22 pervouchine 21 wave gear 17, coupled to the housing 23 of the electric motor 16 having the first intermediate body rotation 24, interacting with covering the separator 22 rigid wheel 25 with internal wave surface 26; a rigid wheel 25 is mounted coaxially with the rotor 18 of the motor 16, the shaft 27 with volnoobrazovaniye 28 second stage 29 of the wave gear 17 connected to the housing 23 of the electric motor 16 of the separator 30 having the second intermediate body rotation 31 and the portion of the surface of the screw 9, covering volnoobrazovaniye 28 second stage 29 has an internal wave surface 32. The motor 16 is a brushless, direct current, variable speed rotation of the rotor 18.

To reduce the size of the Electromechanical drive and increase its efficiency maximum frequency of rotation of the rotor 18 of the motor 16 is in the range of 7000...20000 min-1.

When performing braking is activated, the motor 16 rotates the rotor 18 to the shaft 19 (Fig 3), the load from the shaft 19 through volnoobrazovaniye 20 of the first stage 21 and the separator 22, which is connected with the motor housing 16, through the intermediate body of rotation 24 of the first stage 21 is transmitted to the hard wheel 25 of the first stage 21 of wave transmission, and through the shaft 27, volnoobrazovaniye 28 second stage 29 of wave transmission, and the screw 9 is converted into a force acts is relevant to the nut 13, push the plunger 6 and the brake disk 7 1. The axial force acting on the screw 9 screw mechanism 8 in the direction opposite to the movement of the pressure plunger 6, is perceived thrust bearing 11. Information about the position of the rotor 18, is required to control the electric motor 16, is formed in the control system (not shown) according to the signals of the sensor 33 of the rotor position. To implement the reverse is the reversal of the motor 16.

1. The Electromechanical drive device of the disk brake of a wheel of the main landing gear of the aircraft, comprising at least two modules that are installed on the flange, fixed to the wheel axis, each of which has a body, push the plunger acting on the brake disc, located in the housing screw mechanism, a screw which is mounted in a radial-thrust bearing and leaning his face on the thrust bearing has an inner axial cavity and the nut has a lock, excluding its rotation relative to the housing, the drive gear screw, a motor connected to the drive gear screw, characterized in that in the internal the axial cavity of the screw installed the motor with the rotor at one end of the shaft which is placed volnoobrazovaniye the first stage of two-stage wave gear covering volnoobrazovaniye separa is the PR of the first stage of the wave gear connected to the motor housing, with the first intermediate body rotation, interacting with covering the separator rigid wheel with internal wave surface, with a hard wheel of the second stage is mounted coaxially with the rotor of the motor shaft with volnoobrazovaniye second stage of the wave gear connected to the motor housing separator having a second intermediate body rotation, and the portion of the surface of the screw, covering volnoobrazovaniye second stage of the wave gear has internal wave surface.

2. The device according to claim 1, characterized in that the electric motor is a brushless, direct current, variable speed rotation of the rotor.

3. The device according to claim 2, characterized in that the maximum frequency of rotation of the rotor of the electric motor is in the range of 7000...20000 min-1.

4. The device according to claim 1, characterized in that the flange is attached to the axis of the wheel, is set to nine modules Electromechanical transmission.



 

Same patents:

FIELD: transport.

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FIELD: transport.

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FIELD: transport.

SUBSTANCE: invention relates to air transport, specifically to electromechanical drives of aircraft brakes. The unit consists of two modules installed on flange fixed on wheel axle. Each of the modules has body, thrust plunger, screw mechanism located in the body, electric motor connected with screw drive reducing gear. In the inside axial cavity of the screw, electric motor with rotor is installed. On one of electric motor shaft ends, wave former of the first stage of double-stage harmonic reducing gear and wave former incorporating separator of the first stage of harmonic reducing gear are placed. The separator is connected with electric motor body and has the first intermediate rotation bodies interacting with separator incorporating rigid wheel, with inner waved surface. Rigid wheel of the second stage has shaft installed coaxially with electric motor rotor which shaft has wave former of the second stage of harmonic reducing gear, with separator connected with electric motor body which separator has the second intermediate rotation bodies. Part of screw surface incorporating harmonic reducing gear second stage wave former has inside waved surface.

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6 cl, 9 dwg

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FIELD: mechanical engineering.

SUBSTANCE: disk brake comprises support that is rigidly connected to the brake and embraces one or more brake disks, at least one stop plate, and set of braking linings. The brake disks are mounted on the rotating hub without permitting rotation with respect to the hub and for permitting movement in the axial direction with respect to the hub by means of springs for transmitting brake moment from the brake disk to the hub. The braking linings are mounted for permitting movement in the axial direction inside the support that undergoes loading on the brake linings. The support has an opening through which the brake lining can be inserted or removed.

EFFECT: enhanced reliability.

13 cl, 15 dwg

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