Asymmetry brake with torque limit

摘要

An electric fail-safe is operable to move a first ramp between distinct positions. The first ramp is associated with the second ramp. There are balls intermediate the first and second ramps. When the electric fail-safe brake is in an actuated condition, the second ramp forces stationary brake disks to engage rotating brake disks which rotate with a shaft to cause braking of the shaft. There is a keeper associated with the second ramp which abuts a stop surface to limit the amount of torque applied to the rotary and stationary disks after a predetermined amount of braking force has occurred. A brake with a test switch is also disclosed.

主权项

1. A brake for incorporation into a mechanical movement system comprising:
an electric fail-safe brake that may be provided with power, or disconnected from power, and said electric fail-safe brake being operable to move a first ramp between distinct positions when provided with power in a first condition and when not provided with power in a second condition, and said first ramp being associated with a second ramp, and there being balls intermediate said first and second ramps, and wherein when said electric fail-safe brake is in an actuated one of said first and second conditions, said second ramp forces stationary brake disks to engage rotating brake disks which rotate with a shaft to cause braking of the shaft; and there being a keeper associated with said second ramp which abuts a stop surface to limit the amount of torque applied to said rotary and stationary disks after a predetermined amount of braking force has occurred; wherein a hub is associated with said shaft and a ramp spring biases said second ramp away from said hub with said keeper limiting the amount of compression of said ramp spring.