Intermediate marine bearing with itegrated alignment system

• US 5,906,523 A
• Filed: 08/14/1997
• Issued: 05/25/1999
• Est. Priority Date: 08/14/1997
• Status: Expired due to Fees

• Current Assignee: Thordon Bearings, Inc. (Thomson-Gordon Group)
• Original Assignee: Thordon Bearings, Inc. (Thomson-Gordon Group)
• Inventors: Thomson, George Allan
• Primary Examiner(s): BASINGER, SHERMAN D
• Application Number:
  US08/909,072
• Time in Patent Office: 649 Days
• Field of Search: 440/83, 440/111, 384/428, 384/537, 384/584, 384/620, 29/898.09, 254/93 R
• US Class Current: 440/83
• CPC Class Codes: B63H 23/321 Bearings or seals specially adapted for propeller shafts
• CPC Class Codes: F16C 23/04 self-adjusting
• CPC Class Codes: F16C 2326/30 Ships, e.g. propelling shafts and bearings therefor in general B63H
• CPC Class Codes: F16C 35/02 in the case of sliding-contact bearings
• CPC Class Codes: Y10T 29/497 Pre-usage process, e.g., preloading, aligning

Abstract

An intermediate bearing assembly that is mountable on a pedestal of a marine vessel that incorporates an integrated alignment system. In particular, the bearing assembly includes a housing for receiving a portion of a shaft; and a lifting and lowering system attached between the housing and the pedestal for providing a concentrated applied force at approximately the center vertical axis of the housing. The lifting and lowering system includes four hydraulic jacks located equidistant from the center vertical axis of the housing. Hydraulic pressure is related through the area of the jack cylinders to radial force. As a result, when a predetermined jacking force is achieved, the correct radial force loading on the bearing is attained. Each of the jacks is free to seek a position of extension independent of the others. The jacks are then locked into a secure hold position to maintain the shaft in alignment. If at any time during the vessels duty the shaft becomes misaligned the jacks are unlocked and hydraulic pressure is either reduced or increased to level the shaft and the jacks are then locked into the new holding position. This operation can be repeated as many times as required during the vessel'"'"'s life without the cost of expensive traditional chocking procedures.

Claims

1. A bearing assembly having a center vertical axis and being mountable on a pedestal of a marine vessel, said bearing assembly comprising:

a housing for receiving a portion of a shaft; and

a series of jacks attached between the housing and the pedestal and being located equidistant from the center vertical axis of the housing, each said lack including;

a cylinder portion attached to the bearing assembly;

a piston portion slidably engagable within the cylinder portion, said piston portion being attached to the pedestal;

control means for raising and lowering the cylinder portion to position the shaft at a desired level; and

locking means for rigidly securing the cylinder portion and piston portion together to maintain the shaft at the desired level.

2. The assembly of claim 1, wherein the cylinder portion includes an upper section and a lower threaded section having a piston receiving region;

and wherein the piston portion includes an upper section engagable within the piston receiving region, a base section, and a lower section having a threaded portion.

3. The assembly of claim 2, wherein the cylinder portion includes an entry passage having a fill port and an exit port with said exit port being in fluid communication with the piston receiving region for directing a fluid into the piston receiving region.

4. The assembly of claim 3, further including a fill connector valve assembly for capping the fill port of the entry passage.

5. The assembly of claim 3, wherein the piston portion includes a bleed passage having a entry port and an exit port with said entry port being in fluid communication with the piston receiving region for bleeding fluid from the piston receiving region.

6. The assembly of claim 5, further including a bleeder screw for capping the exit port of the bleed passage.

7. The assembly of claim 6, wherein the control means is a pump means for forcing a hydraulic fluid through the entry passage into the piston receiving region to raise and to lower the cylinder portion relative to the piston portion.

8. The assembly of claim 7, wherein the pump means includes a hydraulic pump connected to a manifold with each of the jacks being connected to the manifold.

9. The assembly of claim 3, which comprises a series of four jacks.

10. The assembly of claim 2, wherein the locking means includes a threaded collar engagable about the lower threaded section of the cylinder portion for securing the cylinder portion to the piston portion;

and further including a clamping ring to secure the locking collar to the base section of the piston portion and a retention bolt threaded through the clamping ring and the base section of the piston portion.

11. A bearing assembly comprising a housing for receiving a portion of a shaft and being mountable on a pedestal and at least one lack attached between the housing and the pedestal, said jack comprising;

a cylinder portion attached to the housing of the bearing assembly;

a piston portion slidably engagable within the cylinder portion, said piston portion being attached to the pedestal;

control means for raising and lowering the cylinder portion to position the shaft at a desired level; and

means for rigidly securing the cylinder portion and piston portion together to maintain the shaft at the desired level.

12. The assembly of claim 11, wherein the cylinder portion includes an upper section and a lower threaded section having a piston receiving region.

13. The assembly of claim 12, wherein the piston portion includes an upper section engagable within the piston receiving region, a base section, and a lower section having a threaded portion.

14. The assembly of claim 13, wherein the cylinder portion includes an entry passage having a fill port and an exit port with said exit port being in fluid communication with the piston receiving region for directing a fluid into the piston receiving region.

15. The assembly of claim 14, further including a fill connector valve assembly for capping the fill port of the entry passage.

16. The assembly of claim 13, wherein the piston portion includes a bleed passage having a entry port and an exit port with said entry port being in fluid communication with the piston receiving region for bleeding fluid from the piston receiving region.

17. The assembly of claim 16, further including a bleeder screw for capping the exit port of the bleed passage.

18. The assembly of claim 17, wherein the control means is a pump means for forcing a hydraulic fluid through the entry passage into the piston receiving region to raise the cylinder portion relative to the piston portion.

19. The assembly of claim 13, wherein the locking means includes a threaded collar engagable about the lower threaded section of the cylinder portion for securing the cylinder portion to the piston portion.

20. The assembly of claim 19, further including a clamping ring to secure the locking collar to the base section of the piston portion.

21. The assembly of claim 20, further including a retention bolt treaded through the clamping ring and the base section of the piston portion.

22. The assembly of claim 21, further including a gasket positioned around the top of the upper section of the piston portion.