Dynamic brake

Patent metadata

Field	Value
Publication number	US-9051981-B2
Application number	US-201313781796-A
Country	US
Kind code	B2
Filing date	Mar 1, 2013
Priority date	Mar 1, 2013
Publication date	Jun 9, 2015
Grant date	Jun 9, 2015

Abstract

A power-off brake for stopping a rotating shaft comprises a solenoid including a coil and armature, an opposing plate axially spaced from the armature, and a ball carrier rotor between the armature and opposing plate. The ball carrier rotor rotates with the shaft and carries spherical balls in recesses angularly space about the shaft. The armature and opposing plate have respective braking surfaces. In one embodiment, at least one braking surface is ramped to urge the plurality of balls radially outward against an internal surface of a surrounding outer race as the armature is forced toward the opposing plate under spring loading when current to the solenoid coil is shut off. In another embodiment, the braking surfaces are not ramped, such that the balls are merely clamped between the braking surfaces upon solenoid deactivation. Increased rolling friction stops rotation of the ball carrier rotor and the shaft without problematic wear.

First claim

What is claimed is:

1. A brake mechanism for stopping rotation of a shaft, the brake mechanism comprising:
a solenoid including a coil and an armature, wherein the armature is attracted in a first direction toward the coil when the coil is energized by current;
at least one spring biasing the armature in a second direction opposite the first direction;
an opposing plate spaced from the armature in the second direction;
a ball carrier rotor arranged between the armature and t…

Assignees

• Moog Inc

Inventors

• Gitnes Seth

Classifications

• F16D2121/22

  Mechanical Engineering · mapped topic

• F16D2065/022

  Mechanical Engineering · mapped topic

• F16D49/00 Primary

  Mechanical Engineering · mapped topic

• F16D59/02 Primary

  Mechanical Engineering · mapped topic