What are the common faults of the torque arm of CJY180 shaft mounted reducer

1、 Installation misalignment fault

Serious angle deviation: The angle between the torque arm and the centerline of the load axis deviates from the design range of 90 °± 5 °, causing the box to bear additional bending moments during operation, greatly increasing the risk of cracking of the shell.

Rigid jamming without floating force: During installation, no ± 3 ° fine-tuning space was reserved, and the pin shaft was completely locked, unable to compensate for the normal radial runout of the load shaft, resulting in the bearing being subjected to excessive lateral loads for a long time.

Insufficient rigidity of support seat: The support seat is fixed on a thin steel plate or non rigid frame, and undergoes elastic deformation with reaction force during operation, directly reducing transmission efficiency and exacerbating overall vibration.

2、 Overload fault caused by force

Bending deformation of the arm body: Long term overload or frequent impact load, the reaction force borne by the torque arm exceeds the design margin of 1.2-1.5 times the rated value, and the arm body undergoes irreversible plastic bending.

Fatigue cracking and fracture: Long term alternating loads act on the stress concentrated arm root position, and microcracks that are not regularly inspected gradually propagate, ultimately leading to sudden fracture of the arm body and loss of reactive force constraints.

Reverse force direction installation: The torque arm is installed on the wrong side, and during operation, the arm is fully compressed rather than pulled, which easily leads to instability and bending, completely losing the anti rotation function

3、 Wear and tear stuck fault

Wear of hinge pin shaft: The pin shaft and ear seat hole experience long-term relative micro motion friction, with a clearance of more than 0.5mm. There is a noticeable impact noise during operation, and the overall amplitude of the machine increases to over 0.15mm.

Wear and failure of joint bushings: The built-in rubber or copper bushings wear through, causing the torque arm to lose its floating compensation ability. All additional loads are directly transmitted to the hollow shaft of the reducer, accelerating the sliding of the locking plate between the hollow shaft and the load shaft.

Foreign object jamming: Dust and iron filings enter the hinge joint, causing the torque arm to be unable to adaptively swing with the slight deviation of the shaft, forming a rigid force, and the additional load is directly transmitted to the bearing.

4、 Connection failure type fault

Bolt loosening and fracture: The bolt was not tightened diagonally three times to the rated torque, and gradually loosened due to alternating vibration during operation. In severe cases, the bolt was sheared and fractured, causing the gearbox to rotate on the shaft.

Failure of connection surface adhesion: There are bumps, protrusions, and uncleaned welding slag on the connection surface between the torque arm and the box, and the adhesion gap exceeds 0.1mm. Local stress concentration causes cracking of the ear socket.

Failure of anti loosening measures: Without installing anti loosening gaskets or stop washers, the support seat bolts loosen after long-term operation, and the entire torque arm support system becomes completely unstable.