Patent ID: 7128529

Claim:
A securing device for a machine or engine shaft on a bearing support, comprising: an extraction nut provided with a thread suitable for interacting with a first thread of said shaft, and a locknut provided with a thread suitable for interacting with a second thread of said bearing support, in such a way as to immobilise said shaft in relation to said bearing support in a chosen position, wherein said first and second threads are inverted in relation to one another, said locknut comprises a stop provided with a front face and first coupling means, said extraction nut comprises second coupling means and a stop provided with a front face configured to be supported on a rear face of a stop of said bearing support in order to define said chosen position, and a rear face on which butts said front face of the stop of the locknut when placed in an immobilisation position, and further comprising a nut lock provided with third and fourth coupling means, designed to interact respectively with said first and second coupling means, in such a way as to couple in rotation said extraction nut and said locknut, once they are in an immobilisation position defining said chosen position.