CA1222911A - Merchant vessel navigating both in open water and for ice-breaking - Google Patents
Merchant vessel navigating both in open water and for ice-breakingInfo
- Publication number
- CA1222911A CA1222911A CA000436409A CA436409A CA1222911A CA 1222911 A CA1222911 A CA 1222911A CA 000436409 A CA000436409 A CA 000436409A CA 436409 A CA436409 A CA 436409A CA 1222911 A CA1222911 A CA 1222911A
- Authority
- CA
- Canada
- Prior art keywords
- propeller
- engine
- shafting
- low
- breaking
- 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
Links
Abstract
ABSTRACT
A low-speed two-stroke diesel engine (12) is provided in the hull (22) and is connected to the propeller (16) via a line of shafting (21) for direct propulsion of the propeller. A thrust bearing (15) secured in the hull (22) and taking the axial forces of the propeller is disposed in the line (21) between the propeller (16) and the diesel engine (12) and a coupling (14) allowing axial movements of the shafting portions connected by the same is provided between the bearing (15) and the engine (12). The merchant vessel running costs are low because the direct propulsion eliminates transmission losses between the engine and the propeller, and because of the low specific fuel consumption of low-speed two-stroke diesel engines. The thrust bearing protects the engine from the considerable axial forces of the propeller occurring during ice-breaking, thus simplifying the engine design.
A low-speed two-stroke diesel engine (12) is provided in the hull (22) and is connected to the propeller (16) via a line of shafting (21) for direct propulsion of the propeller. A thrust bearing (15) secured in the hull (22) and taking the axial forces of the propeller is disposed in the line (21) between the propeller (16) and the diesel engine (12) and a coupling (14) allowing axial movements of the shafting portions connected by the same is provided between the bearing (15) and the engine (12). The merchant vessel running costs are low because the direct propulsion eliminates transmission losses between the engine and the propeller, and because of the low specific fuel consumption of low-speed two-stroke diesel engines. The thrust bearing protects the engine from the considerable axial forces of the propeller occurring during ice-breaking, thus simplifying the engine design.
Description
122Z91~
The invention relates to a merchant vessel navigating both in open water and for ice-breaking, comprising at least one propeller.
In a prior art vessel of this kind, a steam turbine is used for propulsion, with a very high speed in comparison with the propeller speed of about 170 rpm maximum. A reduction gear is provided between the turbine shaft and the propeller shaft.
Because of the need for the reduction gear, a propulsion system of this kind has apprecial mission losses which have an unfavourable effect on the economics of the vessel operation. Turbine propulsion is also uneconomic, because it results in considerable running costs due to the high specific fuel consumption of the turbine while on the other hand it has to be designed for the ice-breaking operation and yet the vessel must be able to navigate in open waters for long periods for commercial purposes. The ice-breaking/ open-water navigation power ratio to be provided by the turbine is about 3 : 1 to
The invention relates to a merchant vessel navigating both in open water and for ice-breaking, comprising at least one propeller.
In a prior art vessel of this kind, a steam turbine is used for propulsion, with a very high speed in comparison with the propeller speed of about 170 rpm maximum. A reduction gear is provided between the turbine shaft and the propeller shaft.
Because of the need for the reduction gear, a propulsion system of this kind has apprecial mission losses which have an unfavourable effect on the economics of the vessel operation. Turbine propulsion is also uneconomic, because it results in considerable running costs due to the high specific fuel consumption of the turbine while on the other hand it has to be designed for the ice-breaking operation and yet the vessel must be able to navigate in open waters for long periods for commercial purposes. The ice-breaking/ open-water navigation power ratio to be provided by the turbine is about 3 : 1 to
2 : 1, the limits being fluid according to the vessel operating conditions.
- The object of the invention is so to improve a merchant vessel of thc kind referred to hereinbefore that ~the propulsion unit running costs are greatly reduced and economic merchant vessel operation is possible.
To this end, according to the invention, a low-speed two-stroke diesel engine is provided in the hull and is connected to the propeller via a line of shafting for direct propulsion of the propeller, and a thrust bearing secured in the hull and taking the axial forces of the propeller is disposed in the line o shafting between the propeller and the diesel engine and a coupling permitting axial displacements of the shafting portions connected by the same is provided between the said bearing and the engine.
: ` ;
The provision of a low-speed two-stroke diesel engine allows direct propeller propulsion, i.e., the diesel engine and propeller speeds are identical. The invention thus obviates any incorporation of a reduction gear so that the transmission efficiency is greatly improved. The vessel running costs are also much lower than with the known turbine propulsion, because of the low specific fuel consumption of low-speed diesel engines, and this has a favourable effect on cost-effectiveness. The provision of a thrust bearing secured in the hull protects the diesel engine from the much greater axial thrust of the propeller during ice-breaking, and this also simplifies the engine design.
It is known to use low-speed two-stroke diesel engines for the direct propulsion of the propeller in merchant vessels required only to sail in open water. In such cases the axial thrust of the propeller is taken by the thrust bearing which is in any case provided in the engine.
One exemplified embodiment of the invention is explained in detail in the following description with reference to the drawing which is a simplified diagram of the propulsion section of a merchant vessel.
A low-speed diesel engine 12 is disposed parallel to the vessel longitudinal axis 10 and is conventionally secured in the hull 22, only part of the stern of which is shown in the drawing. The engine 12, which is of crosshead design and is a two-stroke engine, delivers directly to a line of shafting 21. An adjustable-blade propeller 16 is secured at the bottom end of the shafting 21 as viewed in the drawing and has adjustable blades and moves the vessel both for ice-breaking and open-water navigation.
The engine 12 is provided in known manner with a thrust bearing 17 which takes the axial thrust of the ~;
.~
:, . ~ .
122Z~
crankshaft. A thrust bearing 15 is also provided for the portion of the shafting 21 near the propeller 16, and is secured in the hull 22 and takes the much greater axial thrust originating from the propeller 16 during ice-breaking. A coupling 14 is disposed in the shafting 21 between the thrust bearing 15 and the engine 12 and ls so designed as to take relative axial movements of the connected shaft portions.
The adjustable-blade propeller 16 may alternatively be replaced by a fixed-blade propeller.
The invention is also applicable to vessels driven by two or three propellers operating in parallel, in which case a line of shafting with a low-speed diesel engine delivering thereto is provided for each propeller.
.B
- The object of the invention is so to improve a merchant vessel of thc kind referred to hereinbefore that ~the propulsion unit running costs are greatly reduced and economic merchant vessel operation is possible.
To this end, according to the invention, a low-speed two-stroke diesel engine is provided in the hull and is connected to the propeller via a line of shafting for direct propulsion of the propeller, and a thrust bearing secured in the hull and taking the axial forces of the propeller is disposed in the line o shafting between the propeller and the diesel engine and a coupling permitting axial displacements of the shafting portions connected by the same is provided between the said bearing and the engine.
: ` ;
The provision of a low-speed two-stroke diesel engine allows direct propeller propulsion, i.e., the diesel engine and propeller speeds are identical. The invention thus obviates any incorporation of a reduction gear so that the transmission efficiency is greatly improved. The vessel running costs are also much lower than with the known turbine propulsion, because of the low specific fuel consumption of low-speed diesel engines, and this has a favourable effect on cost-effectiveness. The provision of a thrust bearing secured in the hull protects the diesel engine from the much greater axial thrust of the propeller during ice-breaking, and this also simplifies the engine design.
It is known to use low-speed two-stroke diesel engines for the direct propulsion of the propeller in merchant vessels required only to sail in open water. In such cases the axial thrust of the propeller is taken by the thrust bearing which is in any case provided in the engine.
One exemplified embodiment of the invention is explained in detail in the following description with reference to the drawing which is a simplified diagram of the propulsion section of a merchant vessel.
A low-speed diesel engine 12 is disposed parallel to the vessel longitudinal axis 10 and is conventionally secured in the hull 22, only part of the stern of which is shown in the drawing. The engine 12, which is of crosshead design and is a two-stroke engine, delivers directly to a line of shafting 21. An adjustable-blade propeller 16 is secured at the bottom end of the shafting 21 as viewed in the drawing and has adjustable blades and moves the vessel both for ice-breaking and open-water navigation.
The engine 12 is provided in known manner with a thrust bearing 17 which takes the axial thrust of the ~;
.~
:, . ~ .
122Z~
crankshaft. A thrust bearing 15 is also provided for the portion of the shafting 21 near the propeller 16, and is secured in the hull 22 and takes the much greater axial thrust originating from the propeller 16 during ice-breaking. A coupling 14 is disposed in the shafting 21 between the thrust bearing 15 and the engine 12 and ls so designed as to take relative axial movements of the connected shaft portions.
The adjustable-blade propeller 16 may alternatively be replaced by a fixed-blade propeller.
The invention is also applicable to vessels driven by two or three propellers operating in parallel, in which case a line of shafting with a low-speed diesel engine delivering thereto is provided for each propeller.
.B
Claims (2)
1. A merchant vessel navigating both in open water and for ice-breaking, comprising at least one propeller, characterised in that a low-speed two-stroke diesel engine is provided in the hull and is connected to the propeller via a line of shafting for direct propulsion of the propeller, and a thrust bearing secured in the hull and taking the axial forces of the propeller is disposed in the line of shafting between the propeller and the diesel engine and a coupling permitting axial displacements of the shafting portions connected by the same is provided between the said bearing and the engine.
2. An arrangement according to claim 1, characterised in that the propeller has adjustable blades.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH562182 | 1982-09-23 | ||
| CH5621/82-0 | 1982-09-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1222911A true CA1222911A (en) | 1987-06-16 |
Family
ID=4296668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000436409A Expired CA1222911A (en) | 1982-09-23 | 1983-09-09 | Merchant vessel navigating both in open water and for ice-breaking |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS5975896A (en) |
| CA (1) | CA1222911A (en) |
| FI (1) | FI832625A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7074646B2 (en) * | 2018-11-08 | 2022-05-24 | 三菱造船株式会社 | Ships, how to navigate ships |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4876694U (en) * | 1971-12-23 | 1973-09-21 | ||
| SE434142B (en) * | 1979-08-31 | 1984-07-09 | Stal Laval Turbin Ab | BOAT TRANSMISSION |
-
1983
- 1983-07-19 FI FI832625A patent/FI832625A/en not_active Application Discontinuation
- 1983-09-09 CA CA000436409A patent/CA1222911A/en not_active Expired
- 1983-09-14 JP JP17050583A patent/JPS5975896A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0328358B2 (en) | 1991-04-18 |
| FI832625A0 (en) | 1983-07-19 |
| JPS5975896A (en) | 1984-04-28 |
| FI832625A (en) | 1984-03-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4642059A (en) | Marine contra-rotating propeller apparatus | |
| EP1053173B1 (en) | Propulsion system | |
| US4931026A (en) | Jet propeller | |
| Nitonye et al. | Numerical design and performance analysis of a tug boat propulsion system | |
| US4871332A (en) | Naval propulsion plant with hydraulic transmission | |
| CA1222911A (en) | Merchant vessel navigating both in open water and for ice-breaking | |
| US5249994A (en) | Surface-drive boat propulsion system | |
| US5813887A (en) | Marine propulsion system | |
| WO2001047770A1 (en) | Partially submerged controllable pitch propeller fitted to a transom contoured thereto | |
| WO1986001483A1 (en) | Contra rotating propeller drive | |
| WO2022049081A1 (en) | A propulsion system for vessel and a vessel comprising the propulsion system | |
| CA1224677A (en) | Diesel engine propulsion unit arrangement in a vessel sailing in open waters and ice-breaking | |
| AU2001232494A1 (en) | Propulsion means for a boat | |
| Dymarski et al. | Comparative analysis of selected design variants of propulsion system for an inland waterways ship | |
| GB2055080A (en) | Propelling watercraft | |
| CN2910795Y (en) | Semi-submersed blade type propeller | |
| Rains et al. | Hydrodynamics of podded ship propulsion | |
| RU2330788C1 (en) | Screw rudder complex | |
| US2367325A (en) | Propulsion means for vessels | |
| RU2115588C1 (en) | Shipboard propulsion engine plant, type swinging propeller | |
| SU844480A1 (en) | Ship combination power plant | |
| Meier-Peter | 11.5 Propulsion systems: 11 Ship traffic propulsion technologies | |
| RU150293U1 (en) | CARGO SHIP WITH MULTIFUNCTIONAL TWO-STAGE VEHICLE MOTOR | |
| Meier-Peter | 11.6 Power transmission systems: 11 Ship traffic propulsion technologies | |
| CN104787292A (en) | Electric ship contra-rotating propeller propelling device whole and stern tube structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |