Brake actuator for an aircraft wheel hydraulic brake

Patent metadata

Field	Value
Publication number	US-9476473-B2
Application number	US-201514645792-A
Country	US
Kind code	B2
Filing date	Mar 12, 2015
Priority date	Apr 1, 2014
Publication date	Oct 25, 2016
Grant date	Oct 25, 2016

Abstract

A brake actuator comprising a sleeve ( 1 ), a piston ( 3 ) sealingly slidably mounted in the sleeve to apply a braking force, the piston being provided with an internal cage ( 21 ), and a wear compensating device ( 10 ) which defines a retracted position of the piston in the sleeve by means of an axially mobile stop which is able to be moved forward by the piston during the application of a braking force and/in frictional relationship with a fixed part ( 12 ) of the wear compensating device attached to the sleeve. The mobile stop comprises a radially deformable bushing ( 16 ) which cooperates with an olive ( 15 ) which is attached to a distal end of the fixed part of the wear compensating device. The bushing comprises means for guiding its proximal end ( 17 ) against an internal face of the internal cage ( 21 ).

First claim

The invention claimed is:

1. A brake actuator for an aircraft wheel hydraulic brake, designed to be received in one of the cavities ( 200 ) of a ring of the brake, the actuator comprising
a sleeve ( 1 ) capable of being sealingly received in the cavity of the ring;
a piston ( 3 ) sealingly slidably mounted in the sleeve along a sliding axis (X) to apply a braking force when a pressurized fluid is introduced into the cavity, the piston being provided with an internal cage ( 21 );
a wear compensating device ( 10 ) which defines, with the internal cage, a retracted position of the piston in the sleeve by means of an axially mobile stop which is able to be moved forward by the internal cage during the application of a braking force and/in frictional relationship with a fixed part ( 12 ) of the wear compensating device attached to the sleeve, the mobile stop comprising a radially deformable bushing ( 16 ) which cooperates with an olive ( 15 ) so as to be deformed by said olive which is attached to a distal end of the fixed part of the wear compensating device, a distal end of the internal cage ( 21 ) coming into abutment with the distal end of the bushing ( 16 ) when a braking force is applied; and
a resilient member ( 24 ) for returning the piston to the retracted position defined by the bearing of the piston against the internal cage, the internal cage in turn bearing against the bushing;
wherein the bushing ( 16 ) comprises guiding means for guiding the bushing's proximal end ( 17 ) against an internal face of the internal cage ( 21 ), the bushing being guided both in the region of its internal wall in contact with the olive ( 15 ) and in the region of its proximal end in contact with the internal cage ( 21 ).

2. The brake actuator according to claim 1 , in which the proximal end ( 17 ) of the bushing ( 16 ) is shaped so as to be widened radially in the direction of the internal face of the internal cage ( 21 ) in order to extend so as to fit against said internal face.

3. A hydraulic brake for an aircraft wheel comprising at least one brake actuator according to claim 2 .

4. A hydraulic brake for an aircraft wheel comprising at least one brake actuator according to claim 1 .

Assignees

• Messier Bugatti Dowty

Inventors

• Gonzalez Vincent
• Bussiere Jacques

Classifications

• B64C25/42

  Arrangement or adaptation of brakes · CPC title

• F16D55/40

  actuated by a fluid-pressure device arranged in or one the brake · CPC title

• F16D65/543

  comprising a plastically-deformable member · CPC title

• F16D2121/04

  acting on a piston-type actuator, e.g. for liquid pressure · CPC title

• B64C25/44 Primary

  Actuating mechanisms · CPC title