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US 5,944,148 AGranted
No-back brake
AssigneeThe Boeing Company
InventorsKwan-Ho Bae, Michael J. Cacciola
Life of this patent
Estimating the term…
Abstract
Cooperating brake discs, rotors, and stators all are located at the same side of a pair of cam plate flanges. The cam plate flanges are coupled to an inner sleeve and input gear, respectively, with balls and ball ramp sockets for forcing apart the cam plate flanges when an output side is driven relative to an input side. The brake is effective to prevent relative rotation of the output side relative to the input side, but is released by rotation of an input gear for driving the inner sleeve.
Claims9
A bidirectional no-back brake comprising:
- a stationary housing;
- an inner, torque-transmitting sleeve extending through the housing;
- a cam assembly including an output cam mounted for conjoint rotation with the inner sleeve, an input cam rotatably mounted on the inner sleeve, the input and output cams having cooperating cam surfaces facing each other, and means disposed between the cam surfaces for forcing the input and output cams relatively apart when the output cam rotates relative to the input cam in either direction from a central position;
- an input component encircling the inner sleeve for application of torque to rotate the inner sleeve;
- a first lost motion coupling permitting limited lost motion between the input component and the output cam by way of the inner sleeve;
- a second lost motion coupling permitting limited lost motion between the input component and the input cam;
- and
- a brake assembly located at the side of the input cam opposite the output cam and including stator elements non-rotatable relative to the housing, a rotor element rotatable conjointly with the input cam and brake disc elements fitted between the stator elements and a rotor element, the brake assembly elements being operable to provide increasing braking force when compressed together, and the brake elements being compressed together automatically as a result of the input and output cams being forced apart by rotation of the output cam relative to the input cam from the central position, the braking force of the brake assembly being applied between the housing and the inner sleeve by way of the lost motion couplings, the lost motion couplings being constructed and arranged relatively such that the input and output cams are biased in a direction toward the central position by externally applied rotation of the input component.
5 more elements
A bidirectional no-back brake comprising:
- a stationary housing;
- an inner, torque-transmitting sleeve extending through the housing;
- a cam assembly including an output cam mounted for conjoint rotation with the inner sleeve, an input cam rotatably mounted on the inner sleeve, the input and output cams having cooperating cam surfaces facing each other, and means disposed between the cam surfaces for forcing the input and output cams relatively apart when the output cam rotates relative to the input cam in either direction from a central position;
- an input component encircling the inner sleeve for application of torque to rotate the inner sleeve;
- a first lost motion copuling permitting limited lost motion between the input component and the output cam by way of the inner sleeve;
- a second lost motion coupling permitting limited lost motion between the input component and the input cam;
- and
- a brake assembly including at least one stator element non-rotatable relative to the housing, at least one rotor element rotatable conjointly with the input cam and at least one brake disc element fitted between the stator element and rotor element, the brake assembly elements being located solely at the side of the input cam opposite the output cam and being operable to provide increasing braking force when compressed together, and the brake elements being compressed together automatically as a result of the input and output cams being forced apart by rotation of the output cam relative to the input cam from the central position, the braking force of the brake assembly being applied between the housing and the inner sleeve by way of the lost motion couplings, the lost motion couplings being constructed and arranged relatively such that the input and output cams are biased in a direction toward the central position by externally applied rotation of the input component.
5 more elements
Dependencies are inferred from the claim text.