Overload protection device

Abstract

The present invention provides an overload protection device capable of keeping a rotation transmission at cut-off state, preventing the occurrence of vibrations or noises caused by the transmission of pushing force, accurately setting of the activation torque, and maintaining a reliable operation of retention mechanism. The retention mechanism (165) for keeping cut-off during overload in the overload protection device consisting of a pushing center flange (110), a hub flange (131), steel balls (120), and a pushing board (140) for rotation transmission, is composed of a release buckle (146) installed on the center flange (110) side of pushing board (140), and a retention ball (145) equipped on the inner circumference side of the center flange (110).

Description

technical field [0001] The present invention relates to an overload protection device for isolating rotation transmission when an overload occurs in a torque transmission mechanism. Background technique [0002] In the past, as an overload protection device that interrupts the rotation transmission when an overload occurs in the torque transmission mechanism, there is a central flange that holds the torque transmission element in a plurality of through holes provided in the axial direction of the rotating shaft, and the central flange. The flange is axially oppositely arranged and has a hub flange (hub flange) with a concave portion engaged with the above-mentioned torque transmission element, and is arranged opposite to the above-mentioned central flange on the side opposite to the axial direction of the hub flange and the above-mentioned torque transmission element A pressing plate that presses in the direction of the above-mentioned hub flange. [0003] These overload pr...

AI Technical Summary

Problems solved by technology

[0010] However, the problem with this existing overload protection device 500 is that the steel ball 520 is always in the state of being pushed by the spring 550 after the rotation transmission is cut off, so when the rotation is continuously input, every time the steel ball 520 and the hub flange When the V-shaped cavity 532 of 531 is aligned (at least one rotation occurs once), the steel ball 520 is accommodated in the V-shaped cavity 532 and the rotation is transmitted again. However, if the overload is not eliminated at this time, the rotation transmission will be cut off again as described above, resulting in a large Large vibration and noise, and accelerate the wear of the various components of the overload protection device and aggravate equipment loss

[0022] But the problem with this overload protection device is that the pushing force transmitted to the steel ball is transmitted from the spring through the pushing sleeve, holding ball and pushing plate, which will cause vibration and noise due to passing through many components

[0023] And because there are many components in the transmission path and there are many places where the force is dispersed, it will inevitably lead to fluctuations in the pushing force caused by deviations in strength, dimensional accuracy, assembly accuracy, and vibration, making it difficult to accurately set the overload protection device. working torque, and it is also easy to cause the action failure of the holding mechanism itself

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