WO2014076723A1 - System of transmission for two counter-rotating propellers mounted coaxially - Google Patents
System of transmission for two counter-rotating propellers mounted coaxially Download PDFInfo
- Publication number
- WO2014076723A1 WO2014076723A1 PCT/IT2013/000313 IT2013000313W WO2014076723A1 WO 2014076723 A1 WO2014076723 A1 WO 2014076723A1 IT 2013000313 W IT2013000313 W IT 2013000313W WO 2014076723 A1 WO2014076723 A1 WO 2014076723A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- transmission
- shaft
- gears
- counter
- belts
- Prior art date
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Classifications
-
- 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
- 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
- B63H2005/106—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 with drive shafts of second or further propellers co-axially passing through hub of first propeller, e.g. counter-rotating tandem propellers with co-axial drive shafts
Definitions
- the present invention relates a bevel gears mechanism or a mechanism to gears and belts or chains transmission which allows the transformation of a transmission shaft line with a single propeller propulsion , to a transmission with two coaxial counter-rotating propellers
- Purpose of the present invention is to provide a mechanism with bevel gears , or gears and belts or transmission chains, depending on the powers in play, which has compact size, allowing for easy and convenient hydrodynamic fairing, that may be the more conformable possible depending on the type of accommodation on board the boat, and adaptable to any type of engine ; also the same components of the mechanism may vary , to a certain extent , in the arrangement , in the materials, and in the type, according to requirements, without departing general architecture of the inventive solution proposal.
- Fig.1 shows in a schematic three-dimensional view, the transmission with counter-rotating propellers , according to a first embodiment of the present invention.
- the fig. 2 shows a lower side view of the transmission assembly equipped with counter-rotating propellers
- the fig.3 schematically shows a transparent view of the transmission assembly, without counter-rotating propellers
- the fig.4 shows schematically a longitudinal section of the transmission assembly, without counter-rotating propellers
- FIG. 5 shows the details of the mechanism of transmission.
- the fig.6 shows a three dimensional transparent view of the transmission assembly provided with counter-rotating propellers according to a second embodiment.
- the fig.7 schematically shows a three dimensional view of the fairing .
- the fig. 8 shows a side view in section of the overall transmission devoid of propellers .
- the fig. 9 shows an exploded view of the transmission assembly.
- the transmission shaft (1 ) is in a single piece having each end (2, 2 ') shaped and adapted to the fastening to the flange for coupling the motor at one end, and the other end to flange for the mounting of the propeller; on the main shaft (1 ) with interposition of a gasket seal (3 ), of ball bearings ( 4 ) or rollers , there is a body with hydrodynamic profile that exemplified in the figures is proposed truncated cone ( 5 ) in a single piece , internally provided with a centering block ( 6 ) , and which is connected in a removable manner , by means of four bolts, to a central box-like body (7), of cubic shape, within which are supported bevel gears of the motion of rotation of the primary shaft and the primary shaft ( 1 ) itself that crosses it.
- a first thrust bearing (8 ) followed by a combined bearing (9 ) is interposed between the primary shaft ( 1 ) in the entry in the box body ( 7) and the box- shaped body itself; directly, on the primary shaft, is keyed a bevel wheel gear (10), which, tangentially, engages two bevel gears (11 ) and (12) positioned opposite, each at 90 ° with respect to the wheel (10). These wheels transmit the rotary motion, reversing the direction of rotation, to a further bevel gear (13) positioned in front, and in axis with the wheel (10). On the bevel wheel (13) is keyed a further hollow shaft (14), within which passes, with the interposition of two needle bearings (15, 15 '), the primary shaft (1 )
- the wheels (10) and (13) have a through hole and essentially they are supported, by interposition of thrust bearings, from primary axis and from the central body (7), while each of the wheels (11) and (12) is constrained to a circular support (16, 16 ') and removably fixed to the central body box-shaped (7) by means of bolts (17); between the support (16, 16 ') and the rear axle of the bevel gear is interposed a roller bearing (18).
- a further hollow body of hydrodynamic shape that is exemplified in the figures as a truncated cone (21 ) is connected to the base to the box-shaped central body ( 7 ) by means of bolts , and to the apex with the interposition of a bearing combined double (22 ) and a para-oil double combined (23 ) , that let the ends ( 2 ' , 2" ) of the two coaxial shafts, for mounting the propellers .
- This preferred embodiment of the present invention shows considerable advantages with respect to the types of the prior art .
- the box- cubic configuration of the kinematic with the arrangement of the planet gears placed opposite on sliding guides allows further advantages , such as the possibility of using wheels with toothed modules of different type or tilt, and the diameter of the planet gears may be lower or greater than the diameter of the gear wheel ( 0) that takes the primary force.
- the primary shaft (1 ) moves a first toothed crown (24), which through a chain (25 ) sets in motion another toothed crown (25 ') integral with a driven shaft crowds (26) having the same sense of rotation, which in turn transmits the rotary motion to a second transmission shaft (36), external and coaxial to the primary shaft (1 ) via a pair of tangents gears (38, 38') which achieve also the reverse rotation desidered.
- This mechanism is placed and supported , with the interposition of bearings, inside a box body ( 27) to which it connects a shaped body (28 ) , by means of the fixing cap screw (29 ).
- the primary shaft (1 ) that entering in the body (27) meets, interposed between the main shaft and the body of the same fairing, a double lip seal (30) and a thrust bearing (31 ); then between the containment body box-like (32) and the primary shaft, a further bearing (33); directly on the primary shaft is keyed a toothed crown (24), that through the chain (25) sets in motion another toothed crown (25 ') integral with the driven shaft (26) supported by bearings (34, 35), that are fixed to the containment body box-like, which in turn transmits the rotary motion to the second transmission shaft (36), external and coaxial to the primary shaft (1 ), via a pair of tangents gears (38, 38 ') which achieve the reverse rotation desidered, even with the aid of a combined bearing (thrust
- the chain (25 ) can also be accompanied by a second chain disposed parallel to it .
- the type of chain used may be the most varied, but it is also possible to replace the chain or chains respectively with one or two toothed belts, especially in the presence of low powers . It is possible to use reduction ratios or multiplies between the various trees ; getting speed different rotation of the counter rotating axes . Another remarkable possibility is being able to reverse the arrangement of the kinematic system inside the containment body, so that are arranged first the gears and then the chains or belts, with respect to the point of entry of the primary shaft.
- the kinematic of reversal may be at a remote location , positioned inside the hull , or, directly flanged to the inverter output connected to the main motor. This configuration is realized simply by stretching the two axes coaxial terminals .
- Both the first and the second embodiment according to the present invention allows an easy and convenient insertion of the whole system devised, in a tubular structure, thus creating a jet propulsion with inlet of the water flow frontly, parallel to the axis of thrust.
Abstract
The present invention relates a bevel gears mechanism or a mechanism to gears and belts or chains transmission which allows the transformation of a transmission shaft line with a single propeller propulsion, to a transmission with two coaxial counter-rotating propellers. It is remarkable the support Kinematic system of the bevel gear, inside the box-shaped body of the cubic form, with appropriate seats integrated and removables, structured so as to distribute and balance the forces in play. Its compact configuration, makes it easy to obtain an outflow hydrodynamic optimal, and it is possible the direct installation on the transom.
Description
System of transmission for two counter-rotating propellers mounted coaxially.
Description
The present invention relates a bevel gears mechanism or a mechanism to gears and belts or chains transmission which allows the transformation of a transmission shaft line with a single propeller propulsion , to a transmission with two coaxial counter-rotating propellers
Mechanisms with the gears or transmission belts , for two counter-rotating propellers mounted coaxially , independent of each other , together with the necessary regulators , are known already for a long time , and numerous solutions have been devised. In particular, the solutions to dual counter- rotating propeller were and are studied and applied for the fractionation of the high power absorbed by the propellers and also for the purposes of the mechanical resistance , and / or to reduce the effects of torque of a rotating propeller, or to reduce the diameter of the propellers , especially in certain contingencies . From these transmissions arising inconveniences and still have various problems , especially if them want to apply on engines that have not been specifically studied for these specific transmissions.
These problems are not solved by the known patents that explain a transmission system for two counter-rotating propellers mounted coaxially , as the U.S. patent 5017168 in the name of William Ackley that appears of difficult operation , especially in the case of its disassembly ; the patent US2584115 in the name of Theodore E. Dinsmoor that appears constructively unhappy ; the patent US4792314 in the name of Daniel F. Mc
Cormick , and the patent US5247856 in the name of Cuypers Martinus H , which uses a system of gears certainly unsuitable to transmit power over the 50KW , and the idler gear appears too small compared to the primary. It would therefore be well-liked an architecture of the transmission easily applicable or adaptable to any axis of rotating rectilinear, even for small and medium powers , which guarantees full advantage obtainable by the propulsion system of dual counter-rotating propeller , and that are, greater mechanical strength, a lower power dissipation, greater propulsive efficiency , given by the lower angle of inclination between the hull / axis , taking into account that the diameter of a pair of counter-rotating propellers is significantly lower, at equal transmitted power , of a single propeller; also more active safety, being able to intubate totally the entire system; maneuverability definitely improved , especially in reverse.
Purpose of the present invention , therefore , is to provide a mechanism with bevel gears , or gears and belts or transmission chains, depending on the powers in play, which has compact size, allowing for easy and convenient hydrodynamic fairing, that may be the more conformable possible depending on the type of accommodation on board the boat, and adaptable to any type of engine ; also the same components of the mechanism may vary , to a certain extent , in the arrangement , in the materials, and in the type, according to requirements, without departing general architecture of the inventive solution proposal.
The aims and advantages and other features will become apparent and will be further described by the following description and the accompanying drawings , provided solely for illustrative and not limitative.
Fig.1 shows in a schematic three-dimensional view, the transmission with counter-rotating propellers , according to a first embodiment of the present invention.
The fig. 2 shows a lower side view of the transmission assembly equipped with counter-rotating propellers
The fig.3 schematically shows a transparent view of the transmission assembly, without counter-rotating propellers
The fig.4 shows schematically a longitudinal section of the transmission assembly, without counter-rotating propellers
Figure 5 shows the details of the mechanism of transmission.
The fig.6 shows a three dimensional transparent view of the transmission assembly provided with counter-rotating propellers according to a second embodiment.
The fig.7 schematically shows a three dimensional view of the fairing .
The fig. 8 shows a side view in section of the overall transmission devoid of propellers .
The fig. 9 shows an exploded view of the transmission assembly.
According to the drawings, and in a first preferred embodiment of the present invention , the transmission shaft (1 ) is in a single piece having each end (2, 2 ') shaped and adapted to the fastening to the flange for coupling the motor at one end, and the other end to flange for the mounting of the propeller; on the main shaft (1 ) with interposition of a gasket seal (3 ), of ball bearings ( 4 ) or rollers , there is a body with hydrodynamic profile that exemplified in the figures is proposed truncated cone ( 5 ) in a single piece , internally provided with a centering block ( 6 ) , and which is connected in a removable manner , by means
of four bolts, to a central box-like body (7), of cubic shape, within which are supported bevel gears of the motion of rotation of the primary shaft and the primary shaft ( 1 ) itself that crosses it.
A first thrust bearing (8 ) followed by a combined bearing (9 ) is interposed between the primary shaft ( 1 ) in the entry in the box body ( 7) and the box- shaped body itself; directly, on the primary shaft, is keyed a bevel wheel gear (10), which, tangentially, engages two bevel gears (11 ) and (12) positioned opposite, each at 90 ° with respect to the wheel (10). These wheels transmit the rotary motion, reversing the direction of rotation, to a further bevel gear (13) positioned in front, and in axis with the wheel (10). On the bevel wheel (13) is keyed a further hollow shaft (14), within which passes, with the interposition of two needle bearings (15, 15 '), the primary shaft (1 )
It is remarkable the support Kinematic system of the bevel gear , inside the box-shaped body of the cubic form , with appropriate seats integrated and removables, structured so as to distribute and balance the forces in play. The wheels (10) and (13) have a through hole and essentially they are supported, by interposition of thrust bearings, from primary axis and from the central body (7), while each of the wheels (11) and (12) is constrained to a circular support (16, 16 ') and removably fixed to the central body box-shaped (7) by means of bolts (17); between the support (16, 16 ') and the rear axle of the bevel gear is interposed a roller bearing (18).
A hollow cylindrical support (19), coaxial to the primary shaft (1 ), and interposed between the wheels (10) and (13), acts as a spacer, centering, even for the wheels (11 ) and (12); infact, centrally, by the lateral surface extends vertically a shaft (20) that goes to insert itself into the hole middle of
each of the wheels (11 ) and (12), with interposition of a bearing. A further hollow body of hydrodynamic shape that is exemplified in the figures as a truncated cone (21 ) is connected to the base to the box-shaped central body ( 7 ) by means of bolts , and to the apex with the interposition of a bearing combined double (22 ) and a para-oil double combined (23 ) , that let the ends ( 2 ' , 2" ) of the two coaxial shafts, for mounting the propellers .
This preferred embodiment of the present invention shows considerable advantages with respect to the types of the prior art . In fact, the box- cubic configuration of the kinematic with the arrangement of the planet gears placed opposite on sliding guides, allows further advantages , such as the possibility of using wheels with toothed modules of different type or tilt, and the diameter of the planet gears may be lower or greater than the diameter of the gear wheel ( 0) that takes the primary force.
Others significant advantages are the possibility of obtaining a rotation against rotating with shafts having different rotational speed, and to obtain the power take, always in axis and frontally . Moreover, its compact configuration, makes it easy to obtain an outflow hydrodynamic optimal , and it is possible the direct installation on the transom , both in the case that is fixed to a support outside and the driving shaft is extended and Hole, for connection to the thermal group, or electrical , located inside the hull , both in the case that , on the contrary , the ends of the coaxial shafts, properly extended and supported by a support, are places on the outside for the connection of the propellers.
In a second preferred embodiment of the present invention the primary shaft (1 ) moves a first toothed crown (24), which through a chain (25 ) sets in
motion another toothed crown (25 ') integral with a driven shaft crowds (26) having the same sense of rotation, which in turn transmits the rotary motion to a second transmission shaft (36), external and coaxial to the primary shaft (1 ) via a pair of tangents gears (38, 38') which achieve also the reverse rotation desidered.
This mechanism is placed and supported , with the interposition of bearings, inside a box body ( 27) to which it connects a shaped body (28 ) , by means of the fixing cap screw (29 ). In particularly the primary shaft (1 ) that entering in the body (27) meets, interposed between the main shaft and the body of the same fairing, a double lip seal (30) and a thrust bearing (31 ); then between the containment body box-like (32) and the primary shaft, a further bearing (33); directly on the primary shaft is keyed a toothed crown (24), that through the chain (25) sets in motion another toothed crown (25 ') integral with the driven shaft (26) supported by bearings (34, 35), that are fixed to the containment body box-like, which in turn transmits the rotary motion to the second transmission shaft (36), external and coaxial to the primary shaft (1 ), via a pair of tangents gears (38, 38 ') which achieve the reverse rotation desidered, even with the aid of a combined bearing (thrust bearing + rolling ) (37); an additional bearing (39) fixed to the box-like support, assists to put in rotation the hollow shaft (36), and then the needle bearings (40, 40 ') to support and cancel the friction within the main shaft (1 ).
In a modified embodiment, the chain (25 ) can also be accompanied by a second chain disposed parallel to it . The type of chain used may be the most varied, but it is also possible to replace the chain or chains respectively with one or two toothed belts, especially in the presence of low powers .
It is possible to use reduction ratios or multiplies between the various trees ; getting speed different rotation of the counter rotating axes . Another remarkable possibility is being able to reverse the arrangement of the kinematic system inside the containment body, so that are arranged first the gears and then the chains or belts, with respect to the point of entry of the primary shaft.
The kinematic of reversal may be at a remote location , positioned inside the hull , or, directly flanged to the inverter output connected to the main motor. This configuration is realized simply by stretching the two axes coaxial terminals .
Both the first and the second embodiment according to the present invention allows an easy and convenient insertion of the whole system devised, in a tubular structure, thus creating a jet propulsion with inlet of the water flow frontly, parallel to the axis of thrust.
For powers relatively contained , for example in the case of small internal combustion engines , electrical , or hydraulic , it can make use of composite materials , or various polymers , for the realization of the gears or the chains with the relative sprockets .
As previously described and illustrated it can be seen that the invention fully achieves the intended aim and objects
Claims
Claims
1 ) System of transmission for two counter-rotating propellers mounted coaxially formed by a mechanism that consists of bevel gears or gears and chains or drive belts and in which :
a) the transmission shaft (1 ) is in a single piece having each end (2, 2 ') shaped and adapted to the fastening to the flange for coupling the motor at one end, and the other end to the flange for the mounting of the propeller; b) the main shaft (1 ) passes through a central box-like body, of cubic shape, within which are supported bevel gears, or gears and chains or drive belts, of the motion of rotation of the primary shaft, and are fixed the shaped bodies of support the ends of the shafts of the transmission and / or hydrodynamic fairings and characterized in that :
the hollow cylindrical support (19), coaxial to the primary shaft (1 ), and interposed between the wheels (10) and (13), acts as a spacer, centering, even for the bevel wheels (11 ) and (12), that have a through hole, positioned opposite, each at 90° with respect to the wheel (10); centrally, by the lateral surface extends vertically a shaft (20, 20') that goes to insert itself , into the hole middle of each of the wheels (11 ) and (12), with interposition of a bearing; each of the wheels (11 ) and (12), is constrained to a circular support (16, 16 '); between the support (16, 16 ') and the rear axle of the bevel gear is interposed a roller bearing (18).
2) System of transmission for two counter-rotating propellers mounted coaxially constituted by a bevel gears mechanism or gears and chains or drive belts as in claim 1 ) characterized in that: the primary shaft (1 ) moves a first
toothed crown (24), which through a chain (25 ) setsjn motion another toothed crown (25 ') integral with a driven shaft crowds (26) having the same sense of rotation, which in turn transmits the rotary motion to a second transmission shaft (36), external and coaxial the primary shaft (1 ) via a pair of tangents gears (38, 38 ') which achieve also the reverse rotation desidered .
3) System of transmission for two counter-rotating propellers mounted coaxially constituted by a bevel gears mechanism and drive chains or belts as in claim 1 ) and 2) characterized in that the primary shaft (1 ) that entering in the body (27) meets, interposed between the main shaft and the body of the fairing same, a double lip seal (30) and a thrust bearing (31 ); then between the containment body box-like (32) and the primary shaft, a further bearing (33); and directly on the primary shaft is keyed a toothed crown (24), that through the chain (25) sets in motion another toothed crown (25 ') integral with the driven shaft (26) supported by bearings (34, 35); that are fixed to the containment body box-like, which in turn transmits the rotary motion to the second transmission shaft (36), external and coaxial to the primary shaft (1 ), via a pair of tangents gears (38, 38 ') which achieve the reverse rotation desidered, even with the aid of a combined bearing (thrust bearing + rolling ) (37); an additional bearing (39) fixed to the box-like support, assists to put in rotation the hollow shaft (36, and then the needle bearings (40, 40 ') to support and to cancel the friction within the main shaft (1 ).
4) System of transmission for two counter-rotating propellers mounted coaxially constituted by a bevel gears mechanism and drive chains or belts as in claims 1 ) and 3) characterized in that the chain (25) can also be accompanied by a second chain disposed parallel to it.
5) System of transmission for two counter-rotating propellers mounted coaxially constituted by bevel gears mechanism and drive chains or belts as in claims 1) and claims subsequent, characterized by the fact that for low powers is possible to replace the chain (25) with a toothed belt, and in that this toothed belt may also be accompanied by a second belt arranged parallel to it.
6) System of transmission for two counter-rotating propellers mounted coaxially constituted by a bevel gears mechanism and drive chains or belts as claims 1 ), and claims subsequent characterized by the fact of being able to reverse the arrangement of the kinematic system inside the containment body, so that before are arranged the gears and then the chains or belts, with respect to the point of entry of the primary shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP13829005.1A EP2920056A1 (en) | 2012-11-16 | 2013-11-13 | System of transmission for two counter-rotating propellers mounted coaxially |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITSA2012A000014 | 2012-11-16 | ||
| IT000014A ITSA20120014A1 (en) | 2012-11-16 | 2012-11-16 | TRANSMISSION SYSTEM FOR TWO TIGHTENING CONTROLLED COAXIAL PROPELLERS. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2014076723A1 true WO2014076723A1 (en) | 2014-05-22 |
Family
ID=47633383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IT2013/000313 WO2014076723A1 (en) | 2012-11-16 | 2013-11-13 | System of transmission for two counter-rotating propellers mounted coaxially |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2920056A1 (en) |
| IT (1) | ITSA20120014A1 (en) |
| WO (1) | WO2014076723A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102021102095A1 (en) | 2021-01-29 | 2022-08-04 | Jan-Ole Mischo | Propulsion device for an underwater vehicle |
| IT202100017441A1 (en) | 2021-07-02 | 2023-01-02 | Tech Marin S R L A Socio Unico | Hybrid marine propulsion system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2584115A (en) * | 1948-03-16 | 1952-02-05 | Theodore E Dinsmoor | Torque equalizer for counterrotating propellers |
| US4792314A (en) * | 1988-02-26 | 1988-12-20 | Brunswick Corporation | Marine drive with floating spider differential assembly |
| US5017168A (en) * | 1990-03-12 | 1991-05-21 | Ackley William V | Counter-rotating boat propeller drive |
| US5247856A (en) * | 1989-01-11 | 1993-09-28 | Crown Gear B.V. | Gear transmission between an input shaft and two contrarotating concentric output shafts |
| WO1996016865A1 (en) * | 1994-11-25 | 1996-06-06 | Ab Volvo Penta | Angle gearing, especially for a marine outboard drive unit |
| US6053782A (en) * | 1998-08-13 | 2000-04-25 | Louis A. Bell | Airboat transmission, lubrication system, and associated method |
| EP2202143A1 (en) * | 2008-12-23 | 2010-06-30 | Comercial Gallega de Maquinaria S.L. | Contra-rotating propeller propulsion system for ships |
-
2012
- 2012-11-16 IT IT000014A patent/ITSA20120014A1/en unknown
-
2013
- 2013-11-13 EP EP13829005.1A patent/EP2920056A1/en not_active Withdrawn
- 2013-11-13 WO PCT/IT2013/000313 patent/WO2014076723A1/en active Application Filing
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2584115A (en) * | 1948-03-16 | 1952-02-05 | Theodore E Dinsmoor | Torque equalizer for counterrotating propellers |
| US4792314A (en) * | 1988-02-26 | 1988-12-20 | Brunswick Corporation | Marine drive with floating spider differential assembly |
| US5247856A (en) * | 1989-01-11 | 1993-09-28 | Crown Gear B.V. | Gear transmission between an input shaft and two contrarotating concentric output shafts |
| US5017168A (en) * | 1990-03-12 | 1991-05-21 | Ackley William V | Counter-rotating boat propeller drive |
| WO1996016865A1 (en) * | 1994-11-25 | 1996-06-06 | Ab Volvo Penta | Angle gearing, especially for a marine outboard drive unit |
| US6053782A (en) * | 1998-08-13 | 2000-04-25 | Louis A. Bell | Airboat transmission, lubrication system, and associated method |
| EP2202143A1 (en) * | 2008-12-23 | 2010-06-30 | Comercial Gallega de Maquinaria S.L. | Contra-rotating propeller propulsion system for ships |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102021102095A1 (en) | 2021-01-29 | 2022-08-04 | Jan-Ole Mischo | Propulsion device for an underwater vehicle |
| IT202100017441A1 (en) | 2021-07-02 | 2023-01-02 | Tech Marin S R L A Socio Unico | Hybrid marine propulsion system |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2920056A1 (en) | 2015-09-23 |
| ITSA20120014A1 (en) | 2014-05-17 |
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