US727382A - Means for prevention of weakening propeller-shafts by electrolysis. - Google Patents
Means for prevention of weakening propeller-shafts by electrolysis. Download PDFInfo
- Publication number
- US727382A US727382A US10158602A US1902101586A US727382A US 727382 A US727382 A US 727382A US 10158602 A US10158602 A US 10158602A US 1902101586 A US1902101586 A US 1902101586A US 727382 A US727382 A US 727382A
- Authority
- US
- United States
- Prior art keywords
- shaft
- propeller
- electrolysis
- weakening
- shafts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000005868 electrolysis reaction Methods 0.000 title description 7
- 230000003313 weakening effect Effects 0.000 title description 6
- 230000002265 prevention Effects 0.000 title description 3
- 239000002184 metal Substances 0.000 description 13
- 229910052751 metal Inorganic materials 0.000 description 13
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 239000013535 sea water Substances 0.000 description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 5
- 150000002739 metals Chemical class 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 229910000906 Bronze Inorganic materials 0.000 description 3
- 239000010974 bronze Substances 0.000 description 3
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910000754 Wrought iron Inorganic materials 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 241000190019 Guaiacum Species 0.000 description 1
- 235000004440 Guaiacum sanctum Nutrition 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
- F16C33/121—Use of special materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2202/00—Solid materials defined by their properties
- F16C2202/30—Electric properties; Magnetic properties
- F16C2202/32—Conductivity
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S384/00—Bearings
- Y10S384/90—Cooling or heating
- Y10S384/904—Propeller shaft outer bearing
Definitions
- iron or steel hereinafter termed steel -are placed in close proximity to each other and immersed in sea-water, or seawater is allowed to flow or penetrate between them, galvanic action or electrolysis will result, causing a disintegration or red uctionin weight of the electropositive metal.
- the respective metals are steel and bronze, for example, thesteel being electropositive to the bronze, the two are chemically acted upon by the sea-water and a current of electricity leaves the electropositive metal for the negative metal.
- conformity with a law of electrical action wherever currents leave a metal under such conditions or under conditions similar to those above described such metal is more or less reduced and weakened.
- Such liners are commonly shrunk upon the shaft, and thus made secure thereon with or without the aid of rivets extending through the walls of the shaft into the customary longitudinal bore. Whether or not such rivets are employed it is impracticable to render the j ointsbetween the shaft and the respective liners Water-tight, and the sea-water eventually penetrates between the two metals, as above stated, and produces the electrolytic action.
- the electrolytic action in this case manifests itself in various Ways; but mainly and most seriously in what is termed annular nicking, where the ends of the respective liners are opposed to the shaft.
- Such'ann ular nickin g obviously invites cracks and frequently results in a break in a shaft and the loss of the propeller.
- the object of the present invention is to render impossible the galvanic action of electrolysis above described, and thus to prevent so weakening the propeller-shaft.
- Figure 1 of the drawings represents a longitudinal section through the stern-bearing of a modern vessel, exposing to view the tailshaft.
- Fig. 2 represents a cross-section, on a larger scale, at A B, Fig. 1. 7
- the framework or at the keel of the ship is provided with the customary stern tube or casing 12, of cast-iron, provided internally with bearings c, of lignum-vitae.
- bearings liners d are secured upon the tail-shaft e in any known or improved manner.
- the tail-shaft 6 will in all cases be of the metal or alloy known as nickel-steel; but the Wrought-iron of the liners d may be alloyed -with other metals, provided the liners are of the same or substantially the same polarity as the tail-shaft.
Description
PATENTED MAY 5, 1903.
. A. "A, KNUDSON. I MEANS FOR PREVENTION OF WEAKENING PROPELLER SHAPTS BY ELECTROLYSIS.
APPLICATION FILED APR. 5, 19oz.
E0 MODEL.
THE mmms warm to vnoTmumQ, WASHINGTON, u c.
Witnesses ADOLPHUS A. KNUDSON, OF BROOKLYN,
Patented May '5, i903.
FFICE.
ATENT NEW YORK.
MEANS FOR PREVENTION OF WEAKENING PROPELLER-SHAFTS BY ELECTROLYSIS.
SPECIFICATION forming part of Letters Patent N 0. 727,382, dated May 5, 1903.
Application filed April 5, 1902. -i 1N0.10l,586. (N0 model.)
iron or steel, hereinafter termed steel -are placed in close proximity to each other and immersed in sea-water, or seawater is allowed to flow or penetrate between them, galvanic action or electrolysis will result, causing a disintegration or red uctionin weight of the electropositive metal. In such cases where the respective metals are steel and bronze, for example, thesteel being electropositive to the bronze, the two are chemically acted upon by the sea-water and a current of electricity leaves the electropositive metal for the negative metal. In conformity with a law of electrical action wherever currents leave a metal under such conditions or under conditions similar to those above described such metal is more or less reduced and weakened. In the construction of modern war-ships and ships of the merchant marine this action has been recognized as the cause in many instances of the weakening of what is termed the tail-shaft, which carries the screw-propeller, and as the explanation of accidents to the tail-shaft resulting in the loss of the propeller and the serious delay of the vessel. The action in this case is due to the employment of one or more liners, of bronze, upon the tail-shaft, of steel, and the penetration of the sea-water between the shaft and the respective liners and its chemical and electric contact with the electrically-opposite metals or alloys-that is to say, with metals of different polarity. Such liners are commonly shrunk upon the shaft, and thus made secure thereon with or without the aid of rivets extending through the walls of the shaft into the customary longitudinal bore. Whether or not such rivets are employed it is impracticable to render the j ointsbetween the shaft and the respective liners Water-tight, and the sea-water eventually penetrates between the two metals, as above stated, and produces the electrolytic action. The electrolytic action in this case manifests itself in various Ways; but mainly and most seriously in what is termed annular nicking, where the ends of the respective liners are opposed to the shaft. Such'ann ular nickin g obviously invites cracks and frequently results in a break in a shaft and the loss of the propeller. By such an ac cident the lives of the passengers are placed in great danger and serious financial loss to the owners of the ship is involved. Various means have been proposed for preventing such weakening of propeller-shafts by electrolysis; but so far as I am advised the difficulty has heretofore remained Without a known remedy that is effective.
The object of the present invention is to render impossible the galvanic action of electrolysis above described, and thus to prevent so weakening the propeller-shaft.
The invention consists in certain novel combinations of parts hereinafter set forth and claimed.
'A sheet of drawings accompanies this speci fication as part thereof.
Figure 1 of the drawings represents a longitudinal section through the stern-bearing of a modern vessel, exposing to view the tailshaft. Fig. 2 represents a cross-section, on a larger scale, at A B, Fig. 1. 7
Like reference-letters indicate like parts in both figures.
The framework or at the keel of the ship is provided with the customary stern tube or casing 12, of cast-iron, provided internally with bearings c, of lignum-vitae. Within said bearings liners d are secured upon the tail-shaft e in any known or improved manner. Instead of making such liners d of a metal or alloy of different electric polarity from the tail-shaft e, as heretofore, I make them of. a metal or alloy that is of the same or substantially the same polarity as the tail-shaft, and'thus prevent any galvanic action or effect thereon of sea-water and effectively protect the shaft against electrolysis.
With a tail-shaft e of nickel-steel, which is a preferred material therefor, I make the liners d of wrought-iron containing a sufficient proportion of nickel to render it of the same or substantially the same polarity as nickelsteel.
For the purposes of the present invention the tail-shaft 6 will in all cases be of the metal or alloy known as nickel-steel; but the Wrought-iron of the liners d may be alloyed -with other metals, provided the liners are of the same or substantially the same polarity as the tail-shaft.
Having thus described said improvement, I claim as my invention and desire to patent under this specificationl. The combination of a propeller-shaft of nickel-steel and liners secured upon said shaft and constructed of an alloy the basis of which
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10158602A US727382A (en) | 1902-04-05 | 1902-04-05 | Means for prevention of weakening propeller-shafts by electrolysis. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10158602A US727382A (en) | 1902-04-05 | 1902-04-05 | Means for prevention of weakening propeller-shafts by electrolysis. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US727382A true US727382A (en) | 1903-05-05 |
Family
ID=2795892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US10158602A Expired - Lifetime US727382A (en) | 1902-04-05 | 1902-04-05 | Means for prevention of weakening propeller-shafts by electrolysis. |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US727382A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4344630A (en) * | 1979-12-03 | 1982-08-17 | Imre Veres | Sealingly mounting arrangement for propeller shafts of watercraft |
-
1902
- 1902-04-05 US US10158602A patent/US727382A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4344630A (en) * | 1979-12-03 | 1982-08-17 | Imre Veres | Sealingly mounting arrangement for propeller shafts of watercraft |
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