WO2005021373A1 - Contra rotating variable pitch propellers - Google Patents

Contra rotating variable pitch propellers Download PDF

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Publication number
WO2005021373A1
WO2005021373A1 PCT/HR2003/000044 HR0300044W WO2005021373A1 WO 2005021373 A1 WO2005021373 A1 WO 2005021373A1 HR 0300044 W HR0300044 W HR 0300044W WO 2005021373 A1 WO2005021373 A1 WO 2005021373A1
Authority
WO
WIPO (PCT)
Prior art keywords
propellers
hub
pitch control
pitch
control rod
Prior art date
Application number
PCT/HR2003/000044
Other languages
French (fr)
Inventor
Nenad Fles
Original Assignee
Nenad Fles
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nenad Fles filed Critical Nenad Fles
Priority to AU2003267674A priority Critical patent/AU2003267674A1/en
Priority to PCT/HR2003/000044 priority patent/WO2005021373A1/en
Publication of WO2005021373A1 publication Critical patent/WO2005021373A1/en

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
    • B63H23/02—Transmitting power from propulsion power plant to propulsive elements with mechanical gearing
    • B63H23/06—Transmitting power from propulsion power plant to propulsive elements with mechanical gearing for transmitting drive from a single propulsion power unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H3/00—Propeller-blade pitch changing
    • B63H3/06—Propeller-blade pitch changing characterised by use of non-mechanical actuating means, e.g. electrical
    • B63H3/08—Propeller-blade pitch changing characterised by use of non-mechanical actuating means, e.g. electrical fluid
    • B63H3/081—Propeller-blade pitch changing characterised by use of non-mechanical actuating means, e.g. electrical fluid actuated by control element coaxial with the propeller shaft
    • B63H3/082—Propeller-blade pitch changing characterised by use of non-mechanical actuating means, e.g. electrical fluid actuated by control element coaxial with the propeller shaft the control element being axially reciprocatable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/08—Arrangements on vessels of propulsion elements directly acting on water of propellers of more than one propeller
    • B63H5/10—Arrangements on vessels of propulsion elements directly acting on water of propellers of more than one propeller of coaxial type, e.g. of counter-rotative type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H2005/075—Arrangements on vessels of propulsion elements directly acting on water of propellers using non-azimuthing podded propulsor units, i.e. podded units without means for rotation about a vertical axis, e.g. rigidly connected to the hull
    • 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
    • B63H23/02—Transmitting power from propulsion power plant to propulsive elements with mechanical gearing
    • B63H23/06—Transmitting power from propulsion power plant to propulsive elements with mechanical gearing for transmitting drive from a single propulsion power unit
    • B63H2023/062—Transmitting power from propulsion power plant to propulsive elements with mechanical gearing for transmitting drive from a single propulsion power unit comprising means for simultaneously driving two or more main transmitting elements, e.g. drive shafts
    • B63H2023/067—Transmitting power from propulsion power plant to propulsive elements with mechanical gearing for transmitting drive from a single propulsion power unit comprising means for simultaneously driving two or more main transmitting elements, e.g. drive shafts the elements being formed by two or more coaxial shafts, e.g. counter-rotating shafts

Definitions

  • the Invention deals with marine propellers, in particular with contra rotating propellers featuring pitch control possibility.
  • BACKGROUND ART It is well known that propulsive efficiency of contra-rotating propellers exceeds those of two separated propellers at the same conditions and also considerably exceeds efficiency of single propeller.
  • majority of know contra- rotating arrangements is based on set of bevel gears engaged with two concentric shafts. When reversing the direction of rotation theese gears suffer due to considerable inertial forces caused by retardation and acceleration of the system during manoeuvring.
  • the proposed invention is supposed to be viable solution for application of medium speed four stroke engines for high efficiency propellers in contra rotating arrangement.
  • variable pitch propeller and contrarotating propellers former being well known as advantageous in terms of soft thrust reversing, engine load control and overload protection, possibility of maintaining constant RPM for an PTO generator drive and cleaner environment and later being known as propulsive device having proppeler efficiency far exceeding those inherent to single propeller, jet recuding the overall diameter to abt 80% of single propeller diameter.
  • pitch control concept of each one of the propellers put in contra rotating relation uses well known mechanic developed by any one of the major CPP systems manufacturers.
  • Pitch actuating servo unit can have cylinder arranged at a number of usual positions, such as, within gearbox, at gearbox front side, forward or aft of bevel gear within strut supported body of rotatable or transverse thrusters. on the shaft itself, or in propeller hub.
  • gearbox at gearbox front side
  • forward or aft of bevel gear within strut supported body of rotatable or transverse thrusters. on the shaft itself, or in propeller hub.
  • propeller hub integrated cylinder version is described within the scope of invention, although any one of the said arrangements can be used as well.
  • pitch controling rod (3) drives both yokes in the same longitudinal direction desired pitch change of the propeller blades of "inner” and “outer” propeller is attained by blade cranks (8) being fitted at opposite sides of the blades flanges (12), producing therefore blades (9) rotation in opposite directions as well.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Hydraulic Turbines (AREA)

Abstract

The invention is featuring simple technical solution for blades pitch control of two marine propellers put in contrarotating relation. The arrangement comprises two hollow concentric shafts driven in opposite direction of rotation by means of set of bevel gears (13), 'inner' one (10) embodying pitch control rod (3), flanged to propeller hub (6) and outer shaft (11) flanged to hub (7). Jokes (1) and (2) are fitted to pitch control rod (3), thereof joke (1) rotates with hub (6) and joke (2), thanking to axial bearings (4), rotates freely in opposite direction. Translation of pitch control rod (3) in one direction actuates blade flanges (12) via blade crank pins (8) to rotate in opposite directions. Pitch control rod, actuated by hydraulic oil pressure on piston (14) with hydraulic oil distribution box and feed back device are integrated into systems as usual for CPP propellers. The invention combines high efficiency of contra rotating propellers with well known advantages of variable pitch propeller such as soft thrust reversing with non-reversible engines, reliable engine load control and overload protection, possibility of maintaining constant RPM for an PTO generator drive, and cleaner environment.

Description

CONTRA ROTATING VARIABLE PITCH PROPELLERS
TECHNICAL FIELD
The Invention deals with marine propellers, in particular with contra rotating propellers featuring pitch control possibility. BACKGROUND ART It is well known that propulsive efficiency of contra-rotating propellers exceeds those of two separated propellers at the same conditions and also considerably exceeds efficiency of single propeller. However, majority of know contra- rotating arrangements is based on set of bevel gears engaged with two concentric shafts. When reversing the direction of rotation theese gears suffer due to considerable inertial forces caused by retardation and acceleration of the system during manoeuvring.
In fact, it is only reversible two stroke diesel engine or reversible electric motor that can be coupled to contrarotating propellers system as described above. According to available statistics, portion of four stroke installations sold on the market tends to increase while number of two stroke installations shows decreasing tendency.
The proposed invention is supposed to be viable solution for application of medium speed four stroke engines for high efficiency propellers in contra rotating arrangement.
DISCLOSURE OF THE INVENTION
The invention combines advantages of variable pitch propeller and contrarotating propellers, former being well known as advantageous in terms of soft thrust reversing, engine load control and overload protection, possibility of maintaining constant RPM for an PTO generator drive and cleaner environment and later being known as propulsive device having proppeler efficiency far exceeding those inherent to single propeller, jet recuding the overall diameter to abt 80% of single propeller diameter.
Basically, pitch control concept of each one of the propellers put in contra rotating relation, uses well known mechanic developed by any one of the major CPP systems manufacturers.
Pitch actuating servo unit can have cylinder arranged at a number of usual positions, such as, within gearbox, at gearbox front side, forward or aft of bevel gear within strut supported body of rotatable or transverse thrusters. on the shaft itself, or in propeller hub. For the sake of compactness hub integrated cylinder version is described within the scope of invention, although any one of the said arrangements can be used as well.
In the heart of the patented mechanism there are two yokes (1 and 2) fitted on the pitch controling rod (3) thereof one (1) belonging to "inner" propeller hub (6) being in conventional arrangement while another (2), entitled to acts on "outer" hub (7) propeller blades, is provided with both sides axial bearings (4) to allow transfer of longitudinal forces while active ring, (5) fitted to pitch controlling rod (3), rotates in oposite direction, together with "inner" propeller
(6).
Although pitch controling rod (3) drives both yokes in the same longitudinal direction desired pitch change of the propeller blades of "inner" and "outer" propeller is attained by blade cranks (8) being fitted at opposite sides of the blades flanges (12), producing therefore blades (9) rotation in opposite directions as well.
As it is evident, zero pitch of both propellers is at central position of pitch controlling rod and pitch change, arising from the momeyent of the rod to any direction, will produce thrust of both propellers in the same desired direction.

Claims

1. Patent is requested for mechanism controling pitch of the contrarotating propellers, fitted to fixed strut in pulling or pushing arrangement and featuring common servo piston and servo piston rod for both propellers, fitted on inner shaft hub in a way that piston rod and inner hub jake rotate in one direction while outer hub joke rotates with outer hub and relative motion and longitudinal forces are taken over by odequate bearings however due to provision of joke pins or pin block guides on the oposite sides of the jokes, movement of servo piston rod in one direction produces pitch change of centra rotating propellers in diferent directions creating thrust of the both propellers in the same desired direction. (Fig. l)
2. A unit as set forth in claim 1 in which the servo cylinder (14) is flanged to the bevel gear of inner propeller shaft. (Fig 2)
3. A unit as cat forth in claim 1 or 2 in which strut is not fixed but whole unit is of rotatable (steerable) execution.
4. A system as set forth in claim 1 or 2 with outer (11) and inner (10) shafts fitted within conventional sterntube (15) with addition of gear box (16) entitled to produce contra-rotation of driving (inner) and following (outer) shafts by means of set of bevel gears, whereof intermediate gears (17) being fixed to gear housing (18) while oil supply / feed back unit (19) is regularly mounted at the forward end of reduction gear box (20). (Fig 3)
5. A system as set forth in claim 4 but with gear box (16) incorporated within reduction gear box (20) with the aim to reduce total production, installation and maintenance costs.
PCT/HR2003/000044 2003-09-01 2003-09-01 Contra rotating variable pitch propellers WO2005021373A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2003267674A AU2003267674A1 (en) 2003-09-01 2003-09-01 Contra rotating variable pitch propellers
PCT/HR2003/000044 WO2005021373A1 (en) 2003-09-01 2003-09-01 Contra rotating variable pitch propellers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/HR2003/000044 WO2005021373A1 (en) 2003-09-01 2003-09-01 Contra rotating variable pitch propellers

Publications (1)

Publication Number Publication Date
WO2005021373A1 true WO2005021373A1 (en) 2005-03-10

Family

ID=34259859

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/HR2003/000044 WO2005021373A1 (en) 2003-09-01 2003-09-01 Contra rotating variable pitch propellers

Country Status (2)

Country Link
AU (1) AU2003267674A1 (en)
WO (1) WO2005021373A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008032167A1 (en) * 2006-09-15 2008-03-20 Calzoni S.R.L. Propulsion unit comprising two coaxial contra-rotating propellers
WO2009153124A3 (en) * 2008-05-27 2010-11-18 Siemens Aktiengesellschaft Turbine motor with at least two rotors
CN102216156A (en) * 2008-09-17 2011-10-12 伯格推进技术公司 Propeller
CN106043646A (en) * 2016-07-05 2016-10-26 武汉船用机械有限责任公司 Emergency device for controllable pitch propeller
CN114379751A (en) * 2021-12-31 2022-04-22 武汉理工大学 Contra-rotating propeller propulsion device capable of adjusting blade distance between front propeller and rear propeller

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109927868B (en) * 2019-01-31 2021-08-10 武汉船用机械有限责任公司 Fixed knot of controllable pitch oar constructs

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR949767A (en) * 1940-02-07 1949-09-08 Rotol Ltd Advanced propeller device for propelling aircraft
DE1037908B (en) * 1956-12-10 1958-08-28 Schiffbau Projekt Und Konstruk Z-gear for propeller drive of watercraft
FR2083882A5 (en) * 1970-03-11 1971-12-17 Rostock Dieselmotoren
US5480330A (en) * 1994-10-04 1996-01-02 Outboard Marine Corporation Marine propulsion pump with two counter rotating impellers
DE20104569U1 (en) * 2001-03-16 2001-11-22 Schottel Gmbh & Co Kg Water jet drive for water vehicles with two propellers arranged in the same axis

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR949767A (en) * 1940-02-07 1949-09-08 Rotol Ltd Advanced propeller device for propelling aircraft
DE1037908B (en) * 1956-12-10 1958-08-28 Schiffbau Projekt Und Konstruk Z-gear for propeller drive of watercraft
FR2083882A5 (en) * 1970-03-11 1971-12-17 Rostock Dieselmotoren
US5480330A (en) * 1994-10-04 1996-01-02 Outboard Marine Corporation Marine propulsion pump with two counter rotating impellers
DE20104569U1 (en) * 2001-03-16 2001-11-22 Schottel Gmbh & Co Kg Water jet drive for water vehicles with two propellers arranged in the same axis

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008032167A1 (en) * 2006-09-15 2008-03-20 Calzoni S.R.L. Propulsion unit comprising two coaxial contra-rotating propellers
WO2009153124A3 (en) * 2008-05-27 2010-11-18 Siemens Aktiengesellschaft Turbine motor with at least two rotors
CN102216156A (en) * 2008-09-17 2011-10-12 伯格推进技术公司 Propeller
CN102216156B (en) * 2008-09-17 2014-10-01 伯格推进技术公司 propeller
CN106043646A (en) * 2016-07-05 2016-10-26 武汉船用机械有限责任公司 Emergency device for controllable pitch propeller
CN114379751A (en) * 2021-12-31 2022-04-22 武汉理工大学 Contra-rotating propeller propulsion device capable of adjusting blade distance between front propeller and rear propeller
CN114379751B (en) * 2021-12-31 2023-03-14 武汉理工大学 Contra-rotating propeller propulsion device capable of adjusting blade distance between front propeller and rear propeller

Also Published As

Publication number Publication date
AU2003267674A1 (en) 2005-03-16

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