SAFETY DEVICE OF CARDAN SHAFT Russian patent published in 2013 - IPC F16P1/02 F16D3/84 

FIELD: machine building.

SUBSTANCE: safety device includes drive and driven cardan shafts connected with a splined bushing, and a protective casing. The latter is installed coaxially to shafts and consists of two rigidly fixed flanges and three tubular elements. Two tubular elements have the possibility of being turned relative to flanges, and the third tubular element is movable in axial direction relative to the first tubular element. Four springs are installed in the device with an offset through 90° relative to each other. On one side, the spring ends are installed in grooves of a stop ring, and on the other side, they are rigidly fixed in grooves of the bushing of a thrust bearing. Stop ring is installed on a thread inside the casing of the drive cardan shaft, and projections, with external surfaces of which an external stop ring interacts, are made on opposite side of the thrust bearing bushing. The drive shaft tube end is provided with a ring bushing that is fixed on both sides with stop rings connected to that tube. The ring bushing is rigidly attached to external tube having inner thread and interacting with outer thread of intermediate protective casing. Inner thread of intermediate protective casing interacts through a threaded connection with the stop ring.

EFFECT: improving technological effectiveness of the device operation.

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