Patent ID: 9579805
Date: 2017-02-28
CPC Classifications: B25J

Claim:
1. A brake device of a robot arm, disposed in a housing of a driving module of the robot arm, the driving module comprising a motor, a shaft, a solenoid valve, an operating rod, the motor sheathing on the shaft of the driving module, the motor driving the shaft of the driving module to rotate, the operatin rod being retractably installed on the solenoid valve the solenoid valve controlling the operating rod to retract or extend, the brake device sheathing on an end of the shaft of the driving module near the motor, and the brake device comprising: a prepressing plate formed in a ring shape and fixed on the housing; a ratchet disposed on a side of the prepressing plate and fixed on the shaft of the driving module for rotating along with the shaft of the driving module; a brake resilient plate fixed on the other side of the prepressing plate; a brake disc covering the brake resilient plate and slidable relative to the brake resilient plate, a friction force being formed between the brake disc and the brake resilient plate; a plurality of guiding pins fixed on the brake disc and passing through a plurality of holes formed on the prepressing plate and toward the ratchet; a plurality of recovering springs, each of the plurality of recovering springs sheathing on each of the plurality of guiding pins; a combining plate slidably sheathing on the plurality of guiding pins, the plurality of recovering springs abutting between the brake disc and the combining plate; a combining pin fixed on the combining plate and moving along with the combining plate, the combining pin selectively entering into or leaving from a rotating path of the ratchet; and a control plate for controlling a movement of the combining plate, the control plate comprising a supporting shaft fixed on the prepressing plate, two supporting arms respectively extending from two ends of the supporting shaft and toward two sides of the shaft of the driving module, the two supporting arms being located above the combining plate, and one of the two supporting arms being located in a retracting path of the operating rod; wherein when the solenoid valve controls the operating rod to retract, the two supporting arms release the combining plate, such that the plurality of recovering springs pushes the combining plate to enter into the rotating path of the ratchet and combine with the ratchet, so as to stop the shaft of the driving module from rotating.