EP0478520A1 - Hydraulic stern drive for boats - Google Patents
Hydraulic stern drive for boats Download PDFInfo
- Publication number
- EP0478520A1 EP0478520A1 EP91830395A EP91830395A EP0478520A1 EP 0478520 A1 EP0478520 A1 EP 0478520A1 EP 91830395 A EP91830395 A EP 91830395A EP 91830395 A EP91830395 A EP 91830395A EP 0478520 A1 EP0478520 A1 EP 0478520A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drive
- cross journal
- stern
- stern drive
- boat
- 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.)
- Granted
Links
Images
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
- B63H23/22—Transmitting power from propulsion power plant to propulsive elements with non-mechanical gearing
- B63H23/26—Transmitting power from propulsion power plant to propulsive elements with non-mechanical gearing fluid
Definitions
- the present invention relates to a stern drive for boats,said drive being of a hydraulic operated type.
- the above mentioned prior drives allow a maximum turning angle of about 60-65° related to a horizontal axis and of about ⁇ 35° with respect to a vertical axis.
- the main object of the present invention is to overcome the above mentioned drawback, by providing a stern drive for boats which allows a greater turning range of the drive assembly both about a vertical axis and about a horizontal axis.
- Another object of the present invention is to provide such a drive which can transmit to the boat propeller a power as great as possible,even under great angle turning conditions.
- Yet another object of the present invention is to provide such a stern drive for boat which is very reliable in operation.
- a stern drive for boats essentially comprises a fixed portion and a movable portion,including a propeller driving hydraulic motor,said fixed and movable portions being coupled by a cross journal allowing the movable portion to turn about a horizontal axis and a vertical axis, and causing said hydraulic motor to be supplied with a pressurized fluid derived from a pump driven by primary motor means,said cross journal being moreover adapted to transmit to the boat stresses generated between said movable and fixed portions.
- the stern drive for boats essentially comprises a fixed portion indicated generally at 1,flange coupled to the stern board or transom 2 of the boat,and a movable portion 3 including a hydraulic motor assembly 4 driving a propeller 5.
- the fixed portion is moreover provided with hydraulic fixtures 6,either of the treaded or flanged type,for supplying the hydraulic motor with a pressurized hydraulic fluid delivered from a pump 7 in turn driven by a primary motor or engine 8.
- Said movable portion 3 substantially comprises the drive assembly proper and a mechanism 9 for allowing the bottom or foot of the drive assembly to be raised off water,by a movement about a suitable horizontal axis,and the boat to turn,by a movement about a suitable vertical axis.
- This suspension system comprises a cross journal 10 which,in addition to allowing the movable portion 3 to be displaced about the mentioned axes,is also adapted to transfer the several forces or stresses from the movable to the fixed portion of the drive and,hence,to the boat hull.
- the cross journal moreover,will transmit from the fixed portion to the movable portion,by means of suitable ducts 11,the hydraulic power fluid required for driving the boat.
- a main feature of the present invention is that a broad raising and turning angle range is provided thereby.
- cross journal provides raising and turning angles which are much greater than those provided by conventional prior mechanical driving assemblies.
- a primary driving or motor 8-pump 7 assembly can be provided cooperating with a like emergency assembly, indicated generally at 13.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Hydraulic Motors (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
- Motor Power Transmission Devices (AREA)
- Lubricants (AREA)
Abstract
Description
- The present invention relates to a stern drive for boats,said drive being of a hydraulic operated type.
- As is known,conventional stern drives transfer mechanical power from the primary motor or engine to the boat propeller,by exclusively using mechanical elements,such as cardanic joints,shafts,resilient joints or couplings,motion reversing units,gear wheels and the like.
- Because of inherent limitations of conventional cardanic joints,however,these drives are not devoid of drawbacks,for example with respect to the movements for raising the drive assembly and for turning the boat.
- In fact,the above mentioned prior drives allow a maximum turning angle of about 60-65° related to a horizontal axis and of about ± 35° with respect to a vertical axis.
- Thus,under great angle turning conditions, the power which can be transmitted to the propeller is severely limited.
- Accordingly,the main object of the present invention is to overcome the above mentioned drawback, by providing a stern drive for boats which allows a greater turning range of the drive assembly both about a vertical axis and about a horizontal axis.
- Another object of the present invention is to provide such a drive which can transmit to the boat propeller a power as great as possible,even under great angle turning conditions.
- Yet another object of the present invention is to provide such a stern drive for boat which is very reliable in operation.
- According to one aspect of the present invention, the above mentioned objects,as well as get other objects,which will become more apparent hereinafter, are achieved by a stern drive for boats,characterized in that said drive essentially comprises a fixed portion and a movable portion,including a propeller driving hydraulic motor,said fixed and movable portions being coupled by a cross journal allowing the movable portion to turn about a horizontal axis and a vertical axis, and causing said hydraulic motor to be supplied with a pressurized fluid derived from a pump driven by primary motor means,said cross journal being moreover adapted to transmit to the boat stresses generated between said movable and fixed portions.
- Further characteristics and advantages of the present invention will become more apparent from the following detailed description of a Preferred embodiment thereof,which is illustrated,by way of an indicative but not limitative example,in the figures of the accompanying drawings,where:
- figure 1 is a schematic view illustrating a stern drive provided with a hydraulic motor according to the present invention;
- figs. 1a and 1b are respectively a front view and a top plan view illustrating a cross journal forming a main portion of the stern drive according to the present invention; and
- Figs. 2 and 3 illustrate two possible methods for supplying the hydraulic motor.
- With reference to the figures of the accompanying drawings,the stern drive for boats according to the present invention essentially comprises a fixed portion indicated generally at 1,flange coupled to the stern board or transom 2 of the boat,and a
movable portion 3 including ahydraulic motor assembly 4 driving apropeller 5. - The fixed portion is moreover provided with
hydraulic fixtures 6,either of the treaded or flanged type,for supplying the hydraulic motor with a pressurized hydraulic fluid delivered from apump 7 in turn driven by a primary motor orengine 8. - Said
movable portion 3 substantially comprises the drive assembly proper and amechanism 9 for allowing the bottom or foot of the drive assembly to be raised off water,by a movement about a suitable horizontal axis,and the boat to turn,by a movement about a suitable vertical axis. - In this connection it should be apparent to those skilled in the art that both the weight of the movable portion of the drive and the driving force of the boat propeller,as well as the side force generated during a turning movement of the boat,will be ′discharged′ onto the boat by means of the above disclosed mechanism,which practically constitutes a suspension system.
- This suspension system,in particular, comprises a
cross journal 10 which,in addition to allowing themovable portion 3 to be displaced about the mentioned axes,is also adapted to transfer the several forces or stresses from the movable to the fixed portion of the drive and,hence,to the boat hull. - The cross journal,moreover,will transmit from the fixed portion to the movable portion,by means of
suitable ducts 11,the hydraulic power fluid required for driving the boat. - To that end it is possible to use both several perforations inside the cross journal (not shown) and
bushes 12 applied at the end portions of the cross journal and mounted so as to perform a rotary movement with respect to the end portions. - On the mutual sliding surfaces of the bushes and cross journal,in particular,seals will be applied for preventing any leakage of the pressurized oil circulating in the inside.
- Thus,owing to the provision of the cross journal/bush assembly,from the fixed portion to the movable portion of the drive (and vice versa) it will be possible to transmit both the pressurized oil and the oil returning from the hydraulic motor,which will transform again the hydraulic power into mechanical power for driving the
propeller 5. - A main feature of the present invention is that a broad raising and turning angle range is provided thereby.
- In fact the provision of the cross journal provides raising and turning angles which are much greater than those provided by conventional prior mechanical driving assemblies.
- In particular,as is shown in figure 2,a primary driving or motor 8-
pump 7 assembly can be provided cooperating with a like emergency assembly, indicated generally at 13. - The operation of these two assemblies,in order to operate the
driving assembly 14,can be either simultaneous or not,depending on requirements, and this can be obtained by switching on and off either one or the other of said assemblies by operatingcorresponding taps - As shown in figure 3,it is also possible to supply,by the same
primary motor 8 and a pair ofpumps 7,twodriving assemblies 14,separated from one another,with great advantages from a reliable operation standpoint. - In this connection it should be also apparent that the latter approach,using a single primary motor and a double driving assembly,can be integrated by an auxiliary or emergency assembly supplying either one or both said driving assemblies.
- While the invention has been disclosed and illustrated with reference to a preferred embodiment thereof,it should be apparent that the disclosed embodiment is susceptible to several modifications and variations all of which will come within the spirit and scope of the appended claims.
Claims (7)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT2156090 | 1990-09-25 | ||
IT02156090A IT1243039B (en) | 1990-09-25 | 1990-09-25 | AFT TRANSMISSION FOR BOATS, HYDRAULIC OPERATION. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0478520A1 true EP0478520A1 (en) | 1992-04-01 |
EP0478520B1 EP0478520B1 (en) | 1994-12-07 |
Family
ID=11183611
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91830395A Expired - Lifetime EP0478520B1 (en) | 1990-09-25 | 1991-09-25 | Hydraulic stern drive for boats |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0478520B1 (en) |
JP (1) | JPH04244499A (en) |
AT (1) | ATE115080T1 (en) |
DE (1) | DE69105687T2 (en) |
ES (1) | ES2066412T3 (en) |
IT (1) | IT1243039B (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB961740A (en) * | 1962-06-13 | 1964-06-24 | Stone Manganese Marine Ltd | Improvements relating to bow steering installations for ships |
US3847107A (en) * | 1973-02-16 | 1974-11-12 | C Buddrus | Hydraulic marine propulsion and guidance system |
EP0251995A2 (en) * | 1986-05-12 | 1988-01-07 | HYDROMARINE S.r.l. | Naval propulsion plant with hydraulic transmission |
US4878864A (en) * | 1986-06-30 | 1989-11-07 | Bentem Fransiscus C A Van | Outboard thruster with direct drive hydraulic motor |
-
1990
- 1990-09-25 IT IT02156090A patent/IT1243039B/en active IP Right Grant
-
1991
- 1991-09-25 ES ES91830395T patent/ES2066412T3/en not_active Expired - Lifetime
- 1991-09-25 DE DE69105687T patent/DE69105687T2/en not_active Expired - Fee Related
- 1991-09-25 EP EP91830395A patent/EP0478520B1/en not_active Expired - Lifetime
- 1991-09-25 AT AT91830395T patent/ATE115080T1/en active
- 1991-09-25 JP JP3245513A patent/JPH04244499A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB961740A (en) * | 1962-06-13 | 1964-06-24 | Stone Manganese Marine Ltd | Improvements relating to bow steering installations for ships |
US3847107A (en) * | 1973-02-16 | 1974-11-12 | C Buddrus | Hydraulic marine propulsion and guidance system |
EP0251995A2 (en) * | 1986-05-12 | 1988-01-07 | HYDROMARINE S.r.l. | Naval propulsion plant with hydraulic transmission |
US4878864A (en) * | 1986-06-30 | 1989-11-07 | Bentem Fransiscus C A Van | Outboard thruster with direct drive hydraulic motor |
Also Published As
Publication number | Publication date |
---|---|
JPH04244499A (en) | 1992-09-01 |
DE69105687T2 (en) | 1995-04-13 |
ATE115080T1 (en) | 1994-12-15 |
ES2066412T3 (en) | 1995-03-01 |
DE69105687D1 (en) | 1995-01-19 |
IT9021560A0 (en) | 1990-09-25 |
EP0478520B1 (en) | 1994-12-07 |
IT1243039B (en) | 1994-05-23 |
IT9021560A1 (en) | 1992-03-25 |
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