WO2014013237A1 - Contra-rotating transmission - Google Patents

Contra-rotating transmission Download PDF

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Publication number
WO2014013237A1
WO2014013237A1 PCT/GB2013/051891 GB2013051891W WO2014013237A1 WO 2014013237 A1 WO2014013237 A1 WO 2014013237A1 GB 2013051891 W GB2013051891 W GB 2013051891W WO 2014013237 A1 WO2014013237 A1 WO 2014013237A1
Authority
WO
WIPO (PCT)
Prior art keywords
shaft
bevel gear
coupled
transmission
transmission according
Prior art date
Application number
PCT/GB2013/051891
Other languages
French (fr)
Inventor
Paul Levell
David Scott
Original Assignee
Romax Technology Limited
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 Romax Technology Limited filed Critical Romax Technology Limited
Publication of WO2014013237A1 publication Critical patent/WO2014013237A1/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
    • A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
    • A61C8/005—Connecting devices for joining an upper structure with an implant member, e.g. spacers
    • A61C8/0066—Connecting devices for joining an upper structure with an implant member, e.g. spacers with positioning means
    • 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
    • F16H—GEARING
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
    • F16H1/2854—Toothed gearings for conveying rotary motion with gears having orbital motion involving conical gears
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
    • A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
    • A61C8/005—Connecting devices for joining an upper structure with an implant member, e.g. spacers
    • A61C8/0068—Connecting devices for joining an upper structure with an implant member, e.g. spacers with an additional screw
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
    • A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
    • A61C8/0078—Connecting the upper structure to the implant, e.g. bridging bars with platform switching, i.e. platform between implant and abutment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D15/00—Transmission of mechanical power
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D15/00—Transmission of mechanical power
    • F03D15/10—Transmission of mechanical power using gearing not limited to rotary motion, e.g. with oscillating or reciprocating members
    • 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
    • F16H—GEARING
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
    • F16H1/2809—Toothed gearings for conveying rotary motion with gears having orbital motion with means for equalising the distribution of load on the planet-wheels
    • F16H1/2827—Toothed gearings for conveying rotary motion with gears having orbital motion with means for equalising the distribution of load on the planet-wheels by allowing limited movement of the planet carrier, e.g. relative to its shaft
    • 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
    • F16H—GEARING
    • F16H48/00—Differential gearings
    • F16H48/06—Differential gearings with gears having orbital motion
    • F16H48/08—Differential gearings with gears having orbital motion comprising bevel gears
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
    • A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
    • A61C8/005—Connecting devices for joining an upper structure with an implant member, e.g. spacers
    • A61C8/006—Connecting devices for joining an upper structure with an implant member, e.g. spacers with polygonal positional means, e.g. hexagonal or octagonal
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
    • A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
    • A61C8/005—Connecting devices for joining an upper structure with an implant member, e.g. spacers
    • A61C8/0069—Connecting devices for joining an upper structure with an implant member, e.g. spacers tapered or conical connection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/40—Transmission of power
    • F05B2260/403—Transmission of power through the shape of the drive components
    • F05B2260/4031—Transmission of power through the shape of the drive components as in toothed gearing
    • 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
    • F16H—GEARING
    • F16H48/00—Differential gearings
    • F16H48/06—Differential gearings with gears having orbital motion
    • F16H48/08—Differential gearings with gears having orbital motion comprising bevel gears
    • F16H2048/085—Differential gearings with gears having orbital motion comprising bevel gears characterised by shafts or gear carriers for orbital gears
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Definitions

  • the present invention is related to contra-rotating transmissions. In particular it is related to contra-rotating transmissions for wind or water turbine applications.
  • GB696653A and WO9600349A1 disclose dual rotor turbines for generating electricity from wind which combine rotational energy from each rotor using bevel gears to drive a single generator.
  • GB2487302A describes a dual rotor arrangement for a wind or water turbine which uses a planetary gearbox to combine rotational energy.
  • the gearbox has a first input connected to a first rotor, a second input connected to a second rotor; and a generator connected to the output.
  • a rotational speed of the output is determined by a relative rotational speed of the first and second rotors so that the generator produces electricity of a desired frequency.
  • the transmission having a first shaft and a second shaft concentric with the first shaft, the first shaft and the second shaft configured to be rotated at the same speed but in opposite rotational directions.
  • the transmission further includes a housing and a reversing transmission coupled between the first shaft and the second shaft, the reversing transmission includes a bevel gear carrier; a first bevel gear wheel coupled to the first shaft; a second bevel gear wheel coupled to the second shaft; one or more third bevel gear wheels; each of the one or more third bevel gear wheels supported by the bevel carrier; and flexible coupling means between the housing and the bevel gear carrier. This means that movement of the bevel carrier is restricted in a torsional direction and free in radial, axial and tilt directions.
  • the flexible coupling means includes a member arranged
  • the member is coupled to the bevel gear carrier by a first crowned spline arrangement.
  • the member is coupled to the bevel gear carrier by a second crowned spline arrangement.
  • the member is flexible.
  • an input side of the transmission includes the first shaft and the second shaft and an output side of the transmission includes the first shaft.
  • a wind or water turbine for generating electricity comprising such a transmission, in which a first turbine is coupled to an input side of the first shaft, a second turbine is coupled to the input side of the second shaft, and a generator is coupled to an output side of the first shaft.
  • an output side of the transmission includes the first shaft and the second shaft and an input side of the transmission includes the first shaft.
  • an apparatus for propulsion comprising such a transmission, in which a first propeller is coupled to an output side of the first shaft, a second propeller is coupled to the output side of the second shaft, and an engine is coupled to an input side of the first shaft.
  • Figure 1 is a sectional view of a transmission in accordance with the present invention
  • Figure 2 is a front view of a transmission in accordance with the present invention
  • Figure 3 is a sectional view of Figure 1 along line B-B; and Figure 4 is a detail view of section C of Figure 1 .
  • Figure 1 shows a transmission 100 that enables two concentric shafts 106, 1 10 to be rotated at the same speed but in opposite rotational directions, and which achieves even load sharing between gear meshes.
  • Transmission 100 includes a first shaft 106 and a second shaft 1 10.
  • First shaft 106 and second shaft 1 10 are coupled to a reversing mechanism 102.
  • First shaft 106 and second shaft 1 10 are supported by bearings (not shown).
  • Reversing mechanism 102 shown in Figures 1 to 3, includes a first bevel gear wheel 104 and a second bevel gear wheel 108.
  • First shaft 106 is coupled to reversing mechanism 100 via first bevel gear wheel 104.
  • Second shaft 1 10 is coupled to reversing mechanism 100 via second bevel gear wheel 108.
  • First and second bevel gears 104, 108 are fixedly coupled to first and second shafts 106, 1 10, respectively, so that they are fixed in all degrees of freedom except rotational freedom about their own axes.
  • Reversing mechanism 102 further includes one or more third bevel gear wheels 1 12 supported by corresponding pins 1 13 on a bevel carrier 1 14.
  • the one or more third bevel gear wheels engage with first bevel gear wheel 104 and second bevel gear wheel 108.
  • This arrangement means that, in operation, first shaft 106 and second shaft 1 10 rotate in opposite directions.
  • three bevel gear wheels are utilised to provide best equal load sharing between gear meshes. Other numbers of bevel gear wheels are possible, but the load share will not be equal/optimum.
  • Transmission 100 further includes a housing or casing 122.
  • Reversing mechanism 102 is supported by a flexible coupling means between housing 122 and bevel gear carrier 1 14.
  • the flexible coupling means is shown in more detail in Figure 4, and in the embodiment shown includes an axially elongate member 1 16 between housing 122 and bevel gear carrier 1 14.
  • Member 1 16 can be flexible or rigid.
  • member 1 16 is shown as being coupled to both housing 122 and bevel gear carrier 1 14 by means of crowned spline arrangements 1 18,120. It is to be understood that member 1 16 can be coupled to housing 122 by means of crowned spline
  • member 1 16 can be coupled to bevel gear carrier 1 14 by means of crowned spline arrangement 120 and coupled fixedly to housing 122. It is to be further understood that member 1 16 can be coupled fixedly to both bevel gear carrier 1 14 and housing 122.
  • Spline arrangements 1 18, 120 are shown in Figures 2 and 3 as comprising three segments each spanning 30 degrees and equally spaced around the
  • bevel carrier 1 14 In operation, movement of bevel carrier 1 14 is restricted in a torsional direction but is free in radial, axial and tilt directions.
  • Bevel carrier 1 14 has five degrees of freedom and is only restrained torsionally. This means that bevel pins 1 13 and bevel carrier 1 14 are positioned by the contact points between the one or more third bevel gear wheels 1 12 and the first and second bevel gear wheels 104, 108, and are inherently balance in terms of gear forces.
  • Transmission 100 can be used for applications in which the shafts 106, 1 10 are driven, for example by wind or water turbines.
  • a first turbine is coupled to an input side of first shaft 106
  • a second turbine is coupled to an input side of second shaft 1 10
  • a generator is coupled to an output side of first shaft 106.
  • input side in this context means to the left hand side of Figure 1
  • output side in this context means to the right hand side of Figure 1 .
  • Transmission 100 can also be used for applications in which output sides of shafts 106, 1 10 provide drive and input shaft 106 is driven, as for example for propulsion applications.
  • the term "input side” in this context means to the right hand side of Figure 1
  • the term “output side” in this context means to the left hand side of Figure 1 .
  • This invention permits load sharing between gears in transmissions and enables two concentric shafts to be rotated at the same speed but in opposite rotational directions

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Sustainable Energy (AREA)
  • Sustainable Development (AREA)
  • Epidemiology (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Dentistry (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Wind Motors (AREA)
  • Gear Transmission (AREA)

Abstract

A transmission (100) has two shafts (106,110) coupled to a reversing mechanism (102) which enables the shafts to be rotated at the same speed but in opposite rotational directions. The reversing mechanism (102) includes two bevel gear wheels (104,108) coupled to the two shafts (106,110), and further bevel gear wheels (112) supported by carrier (114) which engage with the two bevel gear wheels (104,108). Reversing mechanism (102) is supported by a flexible coupling means (114) between housing (122) and bevel gear carrier (114). This arrangement achieves even load sharing between gear meshes.

Description

Contra-Rotating Transmission
Technical Field
The present invention is related to contra-rotating transmissions. In particular it is related to contra-rotating transmissions for wind or water turbine applications. Background Art
Load sharing between gears is difficult in transmissions that enable two concentric shafts to be rotated at the same speed but in opposite rotational directions.
GB696653A and WO9600349A1 disclose dual rotor turbines for generating electricity from wind which combine rotational energy from each rotor using bevel gears to drive a single generator. GB2487302A describes a dual rotor arrangement for a wind or water turbine which uses a planetary gearbox to combine rotational energy. The gearbox has a first input connected to a first rotor, a second input connected to a second rotor; and a generator connected to the output. A rotational speed of the output is determined by a relative rotational speed of the first and second rotors so that the generator produces electricity of a desired frequency.
Disclosure of Invention
According to an aspect of the present invention, there is provided a
transmission having a first shaft and a second shaft concentric with the first shaft, the first shaft and the second shaft configured to be rotated at the same speed but in opposite rotational directions. The transmission further includes a housing and a reversing transmission coupled between the first shaft and the second shaft, the reversing transmission includes a bevel gear carrier; a first bevel gear wheel coupled to the first shaft; a second bevel gear wheel coupled to the second shaft; one or more third bevel gear wheels; each of the one or more third bevel gear wheels supported by the bevel carrier; and flexible coupling means between the housing and the bevel gear carrier. This means that movement of the bevel carrier is restricted in a torsional direction and free in radial, axial and tilt directions.
Preferably, the flexible coupling means includes a member arranged
concentrically with the first shaft. Preferably, the member is coupled to the bevel gear carrier by a first crowned spline arrangement. Preferably, the member is coupled to the bevel gear carrier by a second crowned spline arrangement. Preferably, the member is flexible.
Preferably an input side of the transmission includes the first shaft and the second shaft and an output side of the transmission includes the first shaft. Also included is a wind or water turbine for generating electricity comprising such a transmission, in which a first turbine is coupled to an input side of the first shaft, a second turbine is coupled to the input side of the second shaft, and a generator is coupled to an output side of the first shaft.
Preferably an output side of the transmission includes the first shaft and the second shaft and an input side of the transmission includes the first shaft. Also included is an apparatus for propulsion comprising such a transmission, in which a first propeller is coupled to an output side of the first shaft, a second propeller is coupled to the output side of the second shaft, and an engine is coupled to an input side of the first shaft. Brief Description of Drawings
The present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:
Figure 1 is a sectional view of a transmission in accordance with the present invention; Figure 2 is a front view of a transmission in accordance with the present invention;
Figure 3 is a sectional view of Figure 1 along line B-B; and Figure 4 is a detail view of section C of Figure 1 .
Mode(s) for Carrying out the Invention
Figure 1 shows a transmission 100 that enables two concentric shafts 106, 1 10 to be rotated at the same speed but in opposite rotational directions, and which achieves even load sharing between gear meshes.
Transmission 100 includes a first shaft 106 and a second shaft 1 10. First shaft 106 and second shaft 1 10 are coupled to a reversing mechanism 102. First shaft 106 and second shaft 1 10 are supported by bearings (not shown). Reversing mechanism 102, shown in Figures 1 to 3, includes a first bevel gear wheel 104 and a second bevel gear wheel 108. First shaft 106 is coupled to reversing mechanism 100 via first bevel gear wheel 104. Second shaft 1 10 is coupled to reversing mechanism 100 via second bevel gear wheel 108. First and second bevel gears 104, 108 are fixedly coupled to first and second shafts 106, 1 10, respectively, so that they are fixed in all degrees of freedom except rotational freedom about their own axes.
Reversing mechanism 102 further includes one or more third bevel gear wheels 1 12 supported by corresponding pins 1 13 on a bevel carrier 1 14. The one or more third bevel gear wheels engage with first bevel gear wheel 104 and second bevel gear wheel 108. This arrangement means that, in operation, first shaft 106 and second shaft 1 10 rotate in opposite directions. In a preferred embodiment, three bevel gear wheels are utilised to provide best equal load sharing between gear meshes. Other numbers of bevel gear wheels are possible, but the load share will not be equal/optimum.
Transmission 100 further includes a housing or casing 122. Reversing mechanism 102 is supported by a flexible coupling means between housing 122 and bevel gear carrier 1 14.
The flexible coupling means is shown in more detail in Figure 4, and in the embodiment shown includes an axially elongate member 1 16 between housing 122 and bevel gear carrier 1 14. Member 1 16 can be flexible or rigid. In Figures 1 and 4, member 1 16 is shown as being coupled to both housing 122 and bevel gear carrier 1 14 by means of crowned spline arrangements 1 18,120. It is to be understood that member 1 16 can be coupled to housing 122 by means of crowned spline
arrangement 1 18 and coupled fixedly to bevel gear carrier 1 14. It is to be further understood that member 1 16 can be coupled to bevel gear carrier 1 14 by means of crowned spline arrangement 120 and coupled fixedly to housing 122. It is to be further understood that member 1 16 can be coupled fixedly to both bevel gear carrier 1 14 and housing 122. Spline arrangements 1 18, 120 are shown in Figures 2 and 3 as comprising three segments each spanning 30 degrees and equally spaced around the
circumference. It is to be understood that greater or fewer segments, or a complete 360 degree ring of teeth, can be utilised. In operation, movement of bevel carrier 1 14 is restricted in a torsional direction but is free in radial, axial and tilt directions.
Bevel carrier 1 14 has five degrees of freedom and is only restrained torsionally. This means that bevel pins 1 13 and bevel carrier 1 14 are positioned by the contact points between the one or more third bevel gear wheels 1 12 and the first and second bevel gear wheels 104, 108, and are inherently balance in terms of gear forces.
Transmission 100 can be used for applications in which the shafts 106, 1 10 are driven, for example by wind or water turbines. For this application, a first turbine is coupled to an input side of first shaft 106, a second turbine is coupled to an input side of second shaft 1 10, and a generator is coupled to an output side of first shaft 106. The term "input side" in this context means to the left hand side of Figure 1 , and the term "output side" in this context means to the right hand side of Figure 1 .
Transmission 100 can also be used for applications in which output sides of shafts 106, 1 10 provide drive and input shaft 106 is driven, as for example for propulsion applications. The term "input side" in this context means to the right hand side of Figure 1 , and the term "output side" in this context means to the left hand side of Figure 1 .
Industrial Applicability
This invention permits load sharing between gears in transmissions and enables two concentric shafts to be rotated at the same speed but in opposite rotational directions

Claims

Claims
1 . A transmission having a first shaft and a second shaft concentric with the first shaft, the first shaft and the second shaft configured to be rotated at the same speed but in opposite rotational directions, the transmission further comprising: a housing; and a reversing transmission coupled between the first shaft and the second shaft, the reversing transmission including: a bevel gear carrier; a first bevel gear wheel coupled to the first shaft; a second bevel gear wheel coupled to the second shaft; one or more third bevel gear wheels, each of the one or more third bevel gear wheels supported by the bevel carrier; and flexible coupling means between the housing and the bevel gear carrier; wherein movement of the bevel carrier is restricted in a torsional direction and free in radial, axial and tilt directions.
2. A transmission according to claim 1 , in which the one or more third bevel gear wheels comprise three third bevel gear wheels.
3. A transmission according to claim 1 or claim 2, in which the flexible coupling means includes a member arranged concentrically with the first shaft.
4. A transmission according to claim 3, in which the member is coupled to the bevel gear carrier by a first crowned spline arrangement.
5. A transmission according to claim 3 or claim 4, in which the member is coupled to the bevel gear carrier by a second crowned spline arrangement.
6. A transmission according to claim 4 or claim 5, in which the spline arrangement comprises three equally spaced segments each spanning 30 degrees.
7. A transmission according to claim 4 or claim 5, in which the spline arrangement comprises a complete 360 degree ring of teeth.
A transmission according to any of claims 3 to 6, in which the member is flexible.
A transmission according to any preceding claim in which an input side of the transmission includes the first shaft and the second shaft and in which an output side of the transmission includes the first shaft.
A wind or water turbine for generating electricity comprising the transmission according to claim 9, in which a first turbine is coupled to the input side of the first shaft, a second turbine is coupled to the input side of the second shaft, and a generator is coupled to the output side of the first shaft.
A transmission according to any of claims 1 to 8 in which an output side of the transmission includes the first shaft and the second shaft and in which an input side of the transmission includes the first shaft.
A contra-rotating apparatus for propulsion comprising the transmission according to claim 1 1 , in which a first propeller is coupled to an output side of the first shaft, a second propeller is coupled to the output side of the second shaft, and an engine is coupled to an input side of the first shaft.
PCT/GB2013/051891 2012-07-16 2013-07-15 Contra-rotating transmission WO2014013237A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1212578.7A GB2504072B (en) 2012-07-16 2012-07-16 Contra-rotating transmission
GB1212578.7 2012-09-28

Publications (1)

Publication Number Publication Date
WO2014013237A1 true WO2014013237A1 (en) 2014-01-23

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PCT/GB2013/051891 WO2014013237A1 (en) 2012-07-16 2013-07-15 Contra-rotating transmission

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GB (1) GB2504072B (en)
WO (1) WO2014013237A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2901042B1 (en) * 2012-09-28 2016-11-02 Romax Technology Limited Power gearing system for a wind turbine
CN103850882B (en) * 2014-03-25 2016-04-20 上海电机学院 A kind of wind generating unit and electricity-generating method thereof
ES2951132T3 (en) * 2019-10-23 2023-10-18 Vestas Wind Sys As Assembly or disassembly of a set of gears of a wind turbine

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE737886C (en) * 1939-11-15 1943-07-28 Wilhelm Stoeckicht Dipl Ing Helical planetary gear
GB696653A (en) * 1949-12-16 1953-09-02 Lucien Romani Improvements in or relating to torque governors for a windmill
US4106366A (en) * 1975-12-09 1978-08-15 Mannesmann Aktiengesellschaft Planetary gear
GB2136084A (en) * 1983-03-01 1984-09-12 Northern Eng Ind Toothed gearing
WO1996000349A1 (en) * 1994-06-27 1996-01-04 Chan Shin The multi-unit rotor blade system integrated wind turbine
US20100225118A1 (en) * 2009-03-05 2010-09-09 Tarfin Micu Drive System for Use with Flowing Fluids
US20110305570A1 (en) * 2010-06-11 2011-12-15 Chan Shin Aerodynamic dead zone-less triple rotors integrated wind power driven system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1401201A1 (en) * 1986-03-17 1988-06-07 В.И.Козаренко Screw gearing

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE737886C (en) * 1939-11-15 1943-07-28 Wilhelm Stoeckicht Dipl Ing Helical planetary gear
GB696653A (en) * 1949-12-16 1953-09-02 Lucien Romani Improvements in or relating to torque governors for a windmill
US4106366A (en) * 1975-12-09 1978-08-15 Mannesmann Aktiengesellschaft Planetary gear
GB2136084A (en) * 1983-03-01 1984-09-12 Northern Eng Ind Toothed gearing
WO1996000349A1 (en) * 1994-06-27 1996-01-04 Chan Shin The multi-unit rotor blade system integrated wind turbine
US20100225118A1 (en) * 2009-03-05 2010-09-09 Tarfin Micu Drive System for Use with Flowing Fluids
US20110305570A1 (en) * 2010-06-11 2011-12-15 Chan Shin Aerodynamic dead zone-less triple rotors integrated wind power driven system

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Publication number Publication date
GB201212578D0 (en) 2012-08-29
GB2504072A (en) 2014-01-22
CN203114536U (en) 2013-08-07
GB2504072B (en) 2014-08-13

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