Rotor shaft unit

Patent metadata

Field	Value
Publication number	US-11428201-B2
Application number	US-202016925117-A
Country	US
Kind code	B2
Filing date	Jul 9, 2020
Priority date	Jul 16, 2019
Publication date	Aug 30, 2022
Grant date	Aug 30, 2022

Abstract

A rotor shaft unit for a tidal system, which tidal system includes a main frame and a rotor and a housing connected to the rotor, includes a rotor shaft configured to be connected to the main frame, at least one bearing unit for rotatably supporting the housing for rotation relative to the rotor shaft, and a sleeve configured to be mounted in the main frame, the sleeve being disposed around a first end portion of the rotor shaft and connected to the rotor shaft by a friction connection. Also a tidal system including the rotor shaft unit.

First claim

What is claimed is:

1. A rotor shaft unit for a tidal system, the tidal system having a main frame having an opening, a rotor, and a housing connected to the rotor, the rotor shaft unit comprising:
a rotor shaft configured to support the rotor and the housing, the rotor shaft having a first end portion configured to be received in the opening of the main frame,
at least one bearing unit for rotatably supporting the housing for rotation relative to the rotor shaft, and
a sleeve configured to be mounted in the opening of the main frame in a rotationally fixed manner and to receive the first end portion of the rotor shaft and be connected to the first end portion of the rotor shaft by a friction connection.

2. The rotor shaft unit according to claim 1 ,
wherein the friction connection between the first end portion of the rotor shaft and the sleeve is produced by a tapered seat.

3. The rotor shaft unit according to claim 1 ,
wherein an outer circumference of the first end portion of the rotor shaft and/or an inner bore of the sleeve is conical.

4. The rotor shaft unit according to claim 1 , including a hydraulic nut for biasing the rotor shaft relative to the sleeve to generate the friction connection.

5. The rotor shaft unit according to claim 1 , including an oil groove a) formed in the shaft and open toward the sleeve or b) formed in the sleeve and open toward the shaft.

6. The rotor shaft unit according to claim 1 ,
including at least one seal unit disposed around the rotor shaft and configured to seal the bearing unit toward the main frame,
wherein the seal unit is disposed between the housing and the main frame.

7. The rotor shaft unit according to claim 6 , wherein the seal unit is exchangeable.

8. The rotor shaft unit according to claim 7 , wherein the seal unit includes a plurality of seal carrier rings, and wherein each seal carrier ring includes a seal lip.

9. The rotor shaft unit according to claim 8 , wherein the seal carrier rings are individually exchangeable.

10. The rotor shaft unit according to claim 1 ,
wherein the first end of the rotor shaft has an outer diameter that decreases in a first direction and
wherein an inner diameter of the sleeve decreases in the first direction.

11. A tidal system comprising:
a main frame;
a rotor;
a housing connected to the rotor, and
the rotor shaft unit according to claim 1 ,
wherein the sleeve is mounted in the opening of the main frame,
wherein the first end portion of the rotor shaft is mounted in the sleeve, and
wherein a second end portion of the rotor shaft supports the at least one bearing unit.

12. The tidal system according to claim 11 ,
wherein an outer circumference of the rotor shaft and/or an inner bore of the sleeve is conical, and
including a hydraulic nut biasing the shaft against to the sleeve.

13. The tidal system according to claim 12 , including a seal assembly mounted around the rotor shaft axially between the housing and the main frame.

14. The rotor shaft unit according to claim 1 ,
wherein the first end portion of the rotor shaft is rotationally fixed in the opening.

15. A tidal system comprising:
a main frame including an opening;
a sleeve mounted in the opening, the sleeve having an inner surface, the inner surface having a diameter decreasing in a first direction;
a rotor and a housing attached to the rotor,
a rotor shaft having a first end mounted in the sleeve and a second end extending into the housing, the first end having an outer surface, the outer surface of the first end having a diameter decreasing in the first direction,
at least one bearing supporting the housing on the second end of the rotor shaft for rotation relative to the rotor shaft, and
means for biasing the rotor shaft relative to the sleeve to hold the outer surface of the first end against the inner surface of the sleeve to increase friction between the outer surface of the first end and the inner surface of the sleeve.

16. The tidal system according to claim 15 , wherein the means for biasing comprises a hydraulic nut.

17. The tidal system according to claim 15 , wherein the rotor shaft the sleeve and the at least one bearing support form a rotor shaft unit.

18. The tidal system according to claim 15 , wherein the sleeve is rotationally fixed relative to the main frame.

19. The tidal system according to claim 18 ,
wherein the rotor shaft is rotationally fixed relative in the sleeve.

Assignees

• Skf Ab

Inventors

• Baumann Michael
• Hofmann Matthias

Classifications

• F16C2360/00

  Engines or pumps · CPC title

• F03B13/264

  using the horizontal flow of water resulting from tide movement · CPC title

• F16C2226/12

  by press-fit, e.g. plug-in · CPC title

• F03B13/262 Primary

  using the relative movement between a tide-operated member and another member · CPC title

• F03B11/06 Primary

  Bearing arrangements · CPC title