NL9200517A - Bearing structure for concentric shafts, and method for using this structure - Google Patents
Bearing structure for concentric shafts, and method for using this structure Download PDFInfo
- Publication number
- NL9200517A NL9200517A NL9200517A NL9200517A NL9200517A NL 9200517 A NL9200517 A NL 9200517A NL 9200517 A NL9200517 A NL 9200517A NL 9200517 A NL9200517 A NL 9200517A NL 9200517 A NL9200517 A NL 9200517A
- Authority
- NL
- Netherlands
- Prior art keywords
- shafts
- sleeve
- bearing
- construction according
- shaft
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H23/00—Transmitting power from propulsion power plant to propulsive elements
- B63H23/32—Other parts
- B63H23/321—Bearings or seals specially adapted for propeller shafts
-
- 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
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/12—Sliding-contact bearings for exclusively rotary movement characterised by features not related to the direction of the load
- F16C17/18—Sliding-contact bearings for exclusively rotary movement characterised by features not related to the direction of the load with floating brasses or brushing, rotatable at a reduced speed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H23/00—Transmitting power from propulsion power plant to propulsive elements
- B63H23/32—Other parts
- B63H23/321—Bearings or seals specially adapted for propeller shafts
- B63H2023/323—Bearings for coaxial propeller shafts, e.g. for driving propellers of the counter-rotative type
-
- 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
- F16C2326/00—Articles relating to transporting
- F16C2326/30—Ships, e.g. propelling shafts and bearings therefor
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Ocean & Marine Engineering (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
Description
Lagerconstructie voor concentrische assen en werkwijzen voor het gebruik daarvanBearing construction for concentric shafts and methods for their use
Het probleemThe problem
Contraroterende propellers worden aangedreven door concentrische assen, waarbij de binnenas is gelagerd in de, holle, buitenas. Wanneer glïjlagers met volledige vloeistofsmerlng worden toegepast, wordt de binnenas dus gedragen door een oliefilm tussen twee oppervlakken die in tegengestelde richtingen draaien.Counter-rotating propellers are driven by concentric shafts, with the inner shaft mounted in the hollow outer shaft. Thus, when full liquid lubrication plain bearings are used, the inner shaft is supported by an oil film between two surfaces rotating in opposite directions.
Bij lagers waarbij één van de oppervlakken stil staat wordt de olie door het bewegende oppervlak meegenomen en in de wigvormige opening tussen de beide oppervlakken geperst. Hierdoor ontstaat een drukopbouw die draagkracht levert. Wanneer echter beide oppervlakken, met ongeveer gelijke snelheid, in tegengestelde richtingen bewegen, treedt dit effect niet op, zodat geen volledige vloeistof-smering ontstaat.In bearings where one of the surfaces is stationary, the oil is entrained by the moving surface and pressed into the wedge-shaped opening between the two surfaces. This creates a pressure build-up that provides carrying capacity. However, when both surfaces move in opposite directions at approximately the same speed, this effect does not occur, so that complete liquid lubrication is not achieved.
Bekende oplossingenKnown solutions
Bekende oplossingen zijn: 1) Toevoer van olie onder grote druk, door middel van een aparte pomp.Well-known solutions are: 1) Supply of oil under high pressure, by means of a separate pump.
2) Kogel- of rollagers.2) Ball or roller bearings.
Bij zeer grote vermogens hebben beide oplossingen nadelen, bij 1) door het voor de oliepomp benodigde vermogen, wat kan oplopen tot 2% van het schroefasvermogen en bij 2) door de punt- of lijnbelasting, die de lagers kwetsbaar maakt voor stoten en trillingen.At very high powers, both solutions have disadvantages, at 1) because of the power required for the oil pump, which can be up to 2% of the propeller shaft power and at 2) because of the point or line load, which makes the bearings vulnerable to impact and vibrations.
Vooropstelde oplossingProposed solution
Het probleem wordt veroorzaakt doordat beide oppervlakken bewegen. Een stilstaande bus tussen de beide lagerschalen zal dus een verbetering geven.The problem is caused by both surfaces moving. A stationary sleeve between the two bearing shells will therefore give an improvement.
Het draaien van deze bus kan worden voorkomen door een buisvormige derde as, tussen de beide andere in, die slechts geringe krachten en koppels behoeft op te nemen dus licht kan worden uitgevoerd. Een mogelijke uitvoering geeft de figuur.The rotation of this sleeve can be prevented by a tubular third shaft, in between the other two, which only has to absorb small forces and torques, so that it can be carried out lightly. A possible implementation gives the figure.
Een andere mogelijkheid om de rotatie van de bus te voorkomen of tot een voldoende laag toerental te beperken is een tandwiel- of kogeloverbrenging tussen de beide assen.Another possibility to prevent the rotation of the bus or to limit it to a sufficiently low speed is a gear or ball transmission between the two shafts.
Ongelijkmatige slijtage van de bus kan worden voorkomen door deze, hetzij een langzame rotatie te geven, hetzij zo nu en dan, bijvoorbeeld bij stilstand van de as of assen, te verdraaien.Uneven wear of the sleeve can be prevented by either giving it a slow rotation or turning it occasionally, for example when the shaft or axles are at a standstill.
Gebruik bii een enkele asUse a single axis
Ook bij een enkele as is rotatie vereist voor het opbouwen van een oliefilm. Wanneer men deze oliefilm op de juiste plaats wil laten ontstaan, voordat de as in beweging wordt gezet, bijvoorbeeld omdat dit in beweging zetten grote lagerkrach-ten tot gevolg heeft, kan en bus tussen as en lager, die van te voren in draaiing wordt gebracht, een verbetering betekenen.Rotation is also required on a single axis to build up an oil film. If this oil film is to be formed in the right place before the shaft is set in motion, for example because this set in motion results in large bearing forces, a sleeve between shaft and bearing can be rotated beforehand. , mean an improvement.
FiauurbeschriivinaFiauurdescriptions
De figuur geeft schematisch een voorbeeld van de toepassing bij de achterste lagering van de schroefas van een schip. De buitenas 2 is op de normale manier gelagerd in 7, terwijl de binnenas 1 in de buitenas is gelagerd met behulp van bus 4.The figure schematically shows an example of the application in the rear bearing of the propeller shaft of a ship. The outer shaft 2 is normally mounted in 7, while the inner shaft 1 is mounted in the outer shaft using sleeve 4.
In dit voorbeeld staat de bus 4 stil, het draaien wordt voorkomen door een buis 3, die tevens wordt gebruikt om een olieleiding 5 te dragen voor de smering van het lager via de olieboringen 6.In this example, the sleeve 4 is stationary, turning is prevented by a tube 3, which is also used to support an oil pipe 5 for lubrication of the bearing via the oil bores 6.
Claims (9)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL9200517A NL9200517A (en) | 1992-03-20 | 1992-03-20 | Bearing structure for concentric shafts, and method for using this structure |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL9200517 | 1992-03-20 | ||
NL9200517A NL9200517A (en) | 1992-03-20 | 1992-03-20 | Bearing structure for concentric shafts, and method for using this structure |
Publications (1)
Publication Number | Publication Date |
---|---|
NL9200517A true NL9200517A (en) | 1993-10-18 |
Family
ID=19860581
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NL9200517A NL9200517A (en) | 1992-03-20 | 1992-03-20 | Bearing structure for concentric shafts, and method for using this structure |
Country Status (1)
Country | Link |
---|---|
NL (1) | NL9200517A (en) |
-
1992
- 1992-03-20 NL NL9200517A patent/NL9200517A/en not_active Application Discontinuation
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BV | The patent application has lapsed |