Brakes – Operators – Speed-responsive
Patent
1986-01-02
1988-02-09
Reger, Duane A.
Brakes
Operators
Speed-responsive
303112, B60T 852
Patent
active
047236370
ABSTRACT:
In a vehicular brake system such as for use in a commercial aircraft, a torque limiter for maintaining the torque supplied by the braked wheels below a predetermined maximum value. The torque limiter includes a plurality of torque pistons which sense the torque of the wheels and operate in response to a torque value greater than the desired value to isolate the metered brake fluid within the brake cylinders and subsequently reduce the pressure of the brake fluid within the brake cylinders to release the brakes and decrease torque. The torque pistons are mounted in a piston carrier and extend from the piston carrier to engage notches formed in a torque arm housing that at least partially surrounds the piston carrier. Torque piston movement is initiated by relative rotational movement between the piston carrier and torque arm housing caused by an excessive reaction torque from the vehicle structure to the torque produced by the brakes. A valve means is associated with each torque piston such that upon a predetermined degree of movement of the torque pistons, the valve means isolates the brake cylinders from the metered brake fluid input and upon subsequent motion of the torque pistons an expansion chamber is created which accepts a portion of the fluid trapped in the brake cylinders thereby relieving pressure in the brake cylinders and releasing the brakes to reduce brake torque.
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Reger Duane A.
The Boeing Company
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