Ring for a drive unit bearing of a marine vehicle including a segmented active part

1. A ring for a shaft bearing of a marine vehicle drive unit, the ring comprising:

an annular body segmented into a plurality of retractable annular modules wherein each retractable annular module is mechanically connected to a cylindrical frame by two bolts guided in an axial direction and comprising:

an active cylindrical part segmented into a plurality of cylindrical surface segments and designed to provide a sliding contact function in a radial direction with a cylindrical sliding surface radially extending over an inner circumference of a second ring of the shaft bearing, and provide a sliding contact function in an axial direction,

wherein each retractable annular module is separately removable in the axial direction compared to other retractable annular modules of the plurality of retractable annular modules, and wherein each retractable annular module comprises one of the cylindrical surface segments of the active cylindrical part wherein each cylindrical surface segment is removably fixed to the annular body.

2. The ring according to claim 1 , wherein each retractable annular module comprises:

a support and a radial buffer, the radial buffer including the cylindrical surface segment, the radial buffer being detachable from the support.

3. The ring according to claim 1 , wherein each retractable annular module is an arc segment and each retractable annular module has a same angular extension.

4. The ring according to claim 3 , wherein the same angular extension is between about 20° and about 40°.

5. The ring according to claim 1 , wherein the ring further comprises a frontal active part intended to provide a sliding contact function with an axial stop of the shaft bearing, the frontal active part being segmented into a plurality of frontal surfaces, each frontal surface being removably fixed to the annular body.

6. The ring according to claim 5 , wherein each retractable annular module comprises one of the plurality of frontal surfaces forming a part of the frontal active part.

7. The ring according to claim 5 , in which each retractable annular module includes a support and an axial buffer, the axial buffer including the frontal surface and being detachable from the support.

8. The ring according to claim 5 , the ring further comprising a second frontal active part to ensure a function of the sliding contact with a second axial stop of the shaft bearing, the active cylindrical part being axially located between the frontal active parts.

9. A shaft bearing designed to be mounted on a shaft of a propulsion unit of a water vehicle drive unit, comprising an inner ring and an outer ring, at least one of the inner and outer rings being a ring according to claim 1 .

10. The shaft bearing according to claim 9 , further comprising a first axial stop and a second axial stop, the first axial stop being movable in translation in an axial direction of the shaft bearing, the first axial stop comprising a first frontal active part providing a sliding contact function with the inner ring, the inner ring including a second frontal active part providing a sliding contact function with the second axial stop.

11. A method of dismantling an active cylindrical part of a shaft bearing designed to be mounted on a shaft of a propulsion unit of a water vehicle drive unit, comprising an inner ring and an outer ring, at least one of the inner and outer rings having an annular body mechanically connected to a cylindrical frame and segmented into a plurality of retractable annular modules, each retractable annular module including two through holes for a passage of two bolts to affix each retractable annular module to the cylindrical frame, the method comprising:

replacing the two bolts with two rods directed in the axial direction of the ring, wherein each rod being inserted in a through hole of the two through holes of a respective retractable annular module; and

sliding the retractable annular module of the inner ring, along the two rods into a disassembly position, for the disassembly of the active cylindrical part of the shaft bearing, wherein each retractable annular module being removable in the axial direction compared to other retractable annular modules of the plurality of retractable annular modules, and wherein each retractable annular module comprises a cylindrical surface segment of the active cylindrical part wherein each cylindrical surface segment is removably fixed to the retractable annular module.