초록 ▼

A bidirection brake for a rotary device prevents a reverse load or an overrunning load at the output of the rotary device from rotating the output in either direction. The brake includes a pair of opposing plates having pockets formed in their surfaces which contain movable balls. A reverse load or

A bidirection brake for a rotary device prevents a reverse load or an overrunning load at the output of the rotary device from rotating the output in either direction. The brake includes a pair of opposing plates having pockets formed in their surfaces which contain movable balls. A reverse load or an overrunning load causes relative motion between the plates which in turn causes the balls to move to shallower parts of the pockets thereby forcing the plates axially apart. As the plates move apart, they each engage respective skewed roller assemblies which inhibit the rotation of the plates and the shafts which are connected to the plates. The breakout and running friction of the skewed roller assemblies are almost equal so that the brake operates smoothly when it is engaged and when it is released.

대표청구항 ▼

A bidirectional brake comprising: a. housing means; b. rotational shaft means which are supported within the housing means and which have an input end and an output end; c. braking plate means which are connected to the shaft means for rotation therewith; d. a roller assembly which is supported with

A bidirectional brake comprising: a. housing means; b. rotational shaft means which are supported within the housing means and which have an input end and an output end; c. braking plate means which are connected to the shaft means for rotation therewith; d. a roller assembly which is supported within the housing means and which includes a planar member which is rotatable about a first axis, the roller assembly further including roller means which are connected to the planar member such that an axis of rotation of the roller means is generally parallel to the planar member and forms an acute angle with an imaginary radial line extending from the first axis to a circumferential edge of the planar member; and e. means for moving the braking plate means into engagement with the roller assembly when a reverse or overrunning load is applied to the output end of the shaft means, in a manner that the braking plate means engages the roller means thereby generating a first force component which is normal to the roller axis of rotation and which rotates the roller means, and a second force component which is directed along the axis of rotation of the roller means for generating frictional drag to limit the rotation of the braking plate and the shaft means connected thereto.