GB2061851A - Prepulsion unit mounting - Google Patents

Prepulsion unit mounting Download PDF

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Publication number
GB2061851A
GB2061851A GB7937443A GB7937443A GB2061851A GB 2061851 A GB2061851 A GB 2061851A GB 7937443 A GB7937443 A GB 7937443A GB 7937443 A GB7937443 A GB 7937443A GB 2061851 A GB2061851 A GB 2061851A
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GB
United Kingdom
Prior art keywords
propeller shaft
stern tube
arrangement
propeller
bearings
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
Application number
GB7937443A
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GB2061851B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SEAWAY MARINE ASSOCIATES Ltd
Original Assignee
SEAWAY MARINE ASSOCIATES Ltd
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Filing date
Publication date
Application filed by SEAWAY MARINE ASSOCIATES Ltd filed Critical SEAWAY MARINE ASSOCIATES Ltd
Priority to GB7937443A priority Critical patent/GB2061851B/en
Publication of GB2061851A publication Critical patent/GB2061851A/en
Application granted granted Critical
Publication of GB2061851B publication Critical patent/GB2061851B/en
Expired legal-status Critical Current

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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
    • B63H5/125—Arrangements on vessels of propulsion elements directly acting on water of propellers movably mounted with respect to hull, e.g. adjustable in direction, e.g. podded azimuthing thrusters
    • B63H5/1252—Arrangements on vessels of propulsion elements directly acting on water of propellers movably mounted with respect to hull, e.g. adjustable in direction, e.g. podded azimuthing thrusters the ability to move being conferred by gearing in transmission between prime mover and propeller and the propulsion unit being other than in a "Z" configuration

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Sealing Devices (AREA)
  • Sealing Of Bearings (AREA)

Abstract

There is disclosed a propeller shaft and stern tube mounting arrangement for a water-borne vessel. A propeller shaft (4) and stern tube (3) pass through a flexible watertight sealing arrangement (8) in the hull (1) of the vessel. There is means (16, 17, 18, 19, 20) for raising and lowering the propeller shaft and stern tube, angular movement thereof being accommodated by movement of the sealing arrangement. The lifting means could be arranged for operating on either the propeller shaft or the stern tube for raising and lowering the propeller shaft and stern tube. The sealing arrangement provides a watertight seal between the hull and the stern tube. The stern tube is fixed at its inboard end to rigid means which provide for coupling to drive means for the propeller shaft, such as a gear box, the rigid means being mounted for pivoting movement on trunnion bearings in the hull, the axis of the bearings intersecting the sealing arrangement and the axis of the propeller shaft. The rigid means comprises a sub-frame providing a platform (9), the sub-frame, for coupling to drive means, carrying drive coupling means and a journal and thrust bearing (10). <IMAGE>

Description

SPECIFICATION Propeller shaft and stern tube mounting arrangement for a water-borne vessel According to the present invention, there is provided a propeller shaft and stern tube mounting arrangement for a water-borne vessel in which a propeller shaft and stern tube pass through a flexible watertight sealing arrangement in the hull of the vessel, there being means for raising and lowering the propeller shaft and stern tube, angular movement thereof being accomodated by flexing of the sealing arrangement, The lifting means could be arranged for operating on either the propeller shaft or the stern tube to lift the propeller shaft and stern tube, the sealing means providing a watertight seal between the hull and the stern tube.The stern tube could be fixed at its inboard end to rigid means which provide for coupling to drive means for the propeller shaft, such as a gear box, the rigid means being mounted for pivoting movement on bearings, such as trunnion bearings, in the hull, the axis of the bearings intersecting the axis of the propeller shaft and the sealing arrangement. The said rigid means could comprise a sub4rame providing a platform, the sub-frame carrying drive coupling means and a journal and thrust bearing for such drive means. Alternatively, the subframe could carry a gear box for transmission of power to the drive coupling means.
The present invention will now be described by way of example with reference to the accompanying drawings in which: Figure 1 is a side view in section of the after end of a water-borne vessel, Figure 2 is a plan view in section showing in detail part of what is shown in Fig. 1 and Figure 3 is a side view in section of what is shown in Fig. 2.
The underside of the after end of the hull 1, for example an aluminium hull, of a vessel (such as a landing craft, a fishing vessel, a high performance planing craft or an air effect vessel) is shaped to provide a tunnel 2 which receives a stern tube 3 through which passes a propeller shaft 4 which carries a propeller 5.
The propeller shaft 4 is received in the stern tube 3 via a journal bearing 6.
The stern tube 3 passes through an opening in a section 7 of the hull 1, there being a flexible, rubber watertight bushing 8 between the section 7 and the stern tube 3. Bolted to the stern tube 3 at its inboard end is a rigid sub-frame 9 providing a platform which carries a combined journal and thrust bearing 10, reference numeral 25 denoting a stern seal such as a stuffing box or stern gland and reference numeral 26 a propeller shaft coupling.
On each side of the platform there is a respective trunnion bearing 11 of mechanical or rubber bush type, only one of which is shown in Fig. 2, the sub4rame 9 being mounted on the shafts 12 4 2 of the trunnion bearings 11 so that it. can pivot via the bearings 11 in a vertical plane. To compensate for any undue weight of the propeller, the propeller shaft and stern tube, the shafts 1 2 are constructed as torsion bars, their ends remote from the bushing 8 being fast with the section 7 via mountings 1 3. Where it is not necessary that they be constructed as torsion bars, they could be merely short shafts coupled at neither end with the section 7.Reference numeral 14 denotes a strengthening frame in the hull, there being a frame 14 for each of the bearings 11.
The horizontal axis of the bearings 11 passes through the axis of the propeller shaft so that propeller thrust exerts substantially no turning moment on the subJrame 9. Also, the horizontal axis of the bearings 11 passes diametrically and symmetrically through the bushing 8.
The after end of the propeller shaft 4 passes through an after shaf bearing 1 5 to which is connected the lower end of a rigid skeg 1 6, the connection being of a rubber bush type to allow for relative angular movement between the skeg 1 6 and the bearing 1 5. Alternatively, the stern tube 3 could be an extended stern tube, to the after end of which the lower end of the skeg 1 6 is connected in a manner which accommodates a slight axial movement.
In either case, the connection must be such as to give a rigid athwartships location to the propeller shaft and stern tube assembly. The upper end of the skeg 1 6 is connected to a lifting arrangement comprising a cylindrical type cross-head 1 7 in a cylindrical casing 1 8 with suitable lip seals, the cross-head being moveable up and down under the action of a screw 1 9 turnable by a hand-wheel 20.
Thus, the propeller 5 may be lowered (to place it deeper into the water) or raised (to bring it further from the bottom) by turning the wheel 20, the vertical movement of the propeller being accommodated by angular distortion of the rubber bushing 8.
The coupling 26 is connected via a drive shaft 21 including a flexible or constant velocity joint (not shown) to the output of a gear box 22 the input of which is coupled via a drive shaft 23 to the output of an engine 24.
As shown, the gear box 22 is a V-drive gear box, but this is not essential. The bearing 1 0 is arranged as close as possible to the inboard end of the stern tube 3 so that vertical movement of the coupling therebetween is kept to a minimum and substantially no propeller thrust is transmitted to the flexible or constant velocity joint. In an alternative example, the sub-frame 9 is designed to carry a gear box, such as a V-drive gear box, itself, the output of which gear box is coupled directly to the coupling 26, so that the gear box also under goes a vertical movement when the propeller is raised or lowered. The trunnion bearings 11 must be designed to be adequate to absorb the propeller torque involved; and the input of the gear box is coupled via a drive shaft including a flexible or constant velocity joint to the output of an engine.If the propeller 5 is a controllable pitch propeller, the gear box would be a controllable pitch propeller gear box.
In a case where the shafts 1 2 of the trunnion bearings 11 comprise torsion bars, they could be such that the propeller tends to stay in the raised position.
Instead of the form of lifting arrangement shown, any other form of suitable manually operated lifting arrangement could be used, or an electrically or hydraulically operated lifting arrangement, such as a servo-controlled electrically or hydraulically operated lifting arrangement.
CLAIMS (13 Nov 1979) 1. A propeller shaft and stern tube mounting arrangement for a water-borne vessel in which a propeller shaft and stern tube pass through a flexible watertight sealing arrangement in the hull of the vessel, there being means for raising and lowering the propeller shaft and stern tube, angular movement thereof being accommodated by flexing of the sealing arrangement.
2. An arrangement according to claim 1, wherein the lifting means is arranged for operating on either the propeller shaft or the stern tube to lift the propeller shaft and stern tube, the sealing means providing a watertight seal between the hull and the stern tube.
3. An arrangement according to claim 1 or 2, wherein the stern tube is fixed at its inboard end to rigid means which provide for coupling to drive means for the propeller shaft, the rigid means being mounted for pivoting movement on bearings in the hull, the axis of the bearings intersecting the axis of the propeller shaft and the sealing arrangement.
4. An arrangement according to claim 3, wherein, for coupling to such drive means, the said rigid means comprises a sub-frame providing a platform, the sub-frame carrying drive coupling means.
5. An arrangement according to claim 4, wherein the said sub-frame further carries a journal and thrust bearing, between the drive coupling means and the propeller shaft.
6. An arrangement according to claim 4 or 5, wherein the sub-frame further carries a gear box for transmission of power from such drive means to the drive coupling means.
7. An arrangement according to any of claims 3 to 6, wherein the bearings are trunnion bearings.
8. A propeller shaft and stern tube mounting arrangement for a water-borne vessel, substantially in accordance with any example herein described with reference to the accompanying drawings.
CLAIMS (20 Oct 1980) 1. A propeller shaft and stern tube mounting arrangement for a water-borne vessel in which a propeller shaft and stern tube pass through a movable watertight sealing arrangement in the hull of the vessel, there being means for angularly raising and lowering the propeller shaft and stern tube, angular movement thereof being accommodated by movement of the sealing arrangement, wherein the stern tube is fixed at its inboard end to rigid means which provide for coupling to drive means for the propeller shaft, the rigid means being mounted for pivoting movement on bearings in the hull and the axis of the bearings intersecting the sealing arrangement and the axis of the propeller shaft.
2. An arrangement according to claim 1, wherein the lifting means is arranged for operating on either the propeller shaft or the stern tube for raising and lowering the propeller shaft and stern tube.
3. An arrangement according to claim 2, wherein, for coupling to such drive means, the said rigid means comprises a sub-frame providing a platform, the sub-frame carrying drive coupling means.
4. An arrangement according to claim 3, wherein the said sub-frame further carries a journal and thrust bearing, between the drive coupling means and the propeller shaft.
5. An arrangement according to claim 3 or 4, wherein the sub-frame further carries a gear box for transmission of power from such drive means to the drive coupling means.
6. An arrangement according to any of claims 2 to 5, wherein the bearings are trunnion bearings.
7. A propeller shaft and stern mounting arrangement for a water-borne vessel, substantially in accordance with any example herein described with reference to the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (7)

**WARNING** start of CLMS field may overlap end of DESC **. goes a vertical movement when the propeller is raised or lowered. The trunnion bearings 11 must be designed to be adequate to absorb the propeller torque involved; and the input of the gear box is coupled via a drive shaft including a flexible or constant velocity joint to the output of an engine. If the propeller 5 is a controllable pitch propeller, the gear box would be a controllable pitch propeller gear box. In a case where the shafts 1 2 of the trunnion bearings 11 comprise torsion bars, they could be such that the propeller tends to stay in the raised position. Instead of the form of lifting arrangement shown, any other form of suitable manually operated lifting arrangement could be used, or an electrically or hydraulically operated lifting arrangement, such as a servo-controlled electrically or hydraulically operated lifting arrangement. CLAIMS (13 Nov 1979)
1. A propeller shaft and stern tube mounting arrangement for a water-borne vessel in which a propeller shaft and stern tube pass through a flexible watertight sealing arrangement in the hull of the vessel, there being means for raising and lowering the propeller shaft and stern tube, angular movement thereof being accommodated by flexing of the sealing arrangement.
2. An arrangement according to claim 1, wherein the lifting means is arranged for operating on either the propeller shaft or the stern tube to lift the propeller shaft and stern tube, the sealing means providing a watertight seal between the hull and the stern tube.
3. An arrangement according to claim 1 or 2, wherein the stern tube is fixed at its inboard end to rigid means which provide for coupling to drive means for the propeller shaft, the rigid means being mounted for pivoting movement on bearings in the hull, the axis of the bearings intersecting the axis of the propeller shaft and the sealing arrangement.
4. An arrangement according to claim 3, wherein, for coupling to such drive means, the said rigid means comprises a sub-frame providing a platform, the sub-frame carrying drive coupling means.
5. An arrangement according to claim 4, wherein the said sub-frame further carries a journal and thrust bearing, between the drive coupling means and the propeller shaft.
6. An arrangement according to claim 4 or 5, wherein the sub-frame further carries a gear box for transmission of power from such drive means to the drive coupling means.
7. A propeller shaft and stern mounting arrangement for a water-borne vessel, substantially in accordance with any example herein described with reference to the accompanying drawings.
7. An arrangement according to any of claims 3 to 6, wherein the bearings are trunnion bearings.
8. A propeller shaft and stern tube mounting arrangement for a water-borne vessel, substantially in accordance with any example herein described with reference to the accompanying drawings.
CLAIMS (20 Oct 1980)
1. A propeller shaft and stern tube mounting arrangement for a water-borne vessel in which a propeller shaft and stern tube pass through a movable watertight sealing arrangement in the hull of the vessel, there being means for angularly raising and lowering the propeller shaft and stern tube, angular movement thereof being accommodated by movement of the sealing arrangement, wherein the stern tube is fixed at its inboard end to rigid means which provide for coupling to drive means for the propeller shaft, the rigid means being mounted for pivoting movement on bearings in the hull and the axis of the bearings intersecting the sealing arrangement and the axis of the propeller shaft.
2. An arrangement according to claim 1, wherein the lifting means is arranged for operating on either the propeller shaft or the stern tube for raising and lowering the propeller shaft and stern tube.
3. An arrangement according to claim 2, wherein, for coupling to such drive means, the said rigid means comprises a sub-frame providing a platform, the sub-frame carrying drive coupling means.
4. An arrangement according to claim 3, wherein the said sub-frame further carries a journal and thrust bearing, between the drive coupling means and the propeller shaft.
5. An arrangement according to claim 3 or 4, wherein the sub-frame further carries a gear box for transmission of power from such drive means to the drive coupling means.
6. An arrangement according to any of claims 2 to 5, wherein the bearings are trunnion bearings.
GB7937443A 1979-10-29 1979-10-29 Propulsion unit mounting Expired GB2061851B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7937443A GB2061851B (en) 1979-10-29 1979-10-29 Propulsion unit mounting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7937443A GB2061851B (en) 1979-10-29 1979-10-29 Propulsion unit mounting

Publications (2)

Publication Number Publication Date
GB2061851A true GB2061851A (en) 1981-05-20
GB2061851B GB2061851B (en) 1983-07-13

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GB7937443A Expired GB2061851B (en) 1979-10-29 1979-10-29 Propulsion unit mounting

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4699599A (en) * 1984-09-25 1987-10-13 Noennecke Ernst Ship's hull with a cantilevered elastic stern tube arrangement for the elastic mounting of the tailshaft
US4765075A (en) * 1985-08-08 1988-08-23 Sanshin Kogyo Kabushiki Kaisha Water propulsion unit of water jet propulsion craft
EP0450507A1 (en) * 1990-04-06 1991-10-09 Fabio Buzzi Device for regulating the inclination angle of a surface propeller shaft line as to the water plane

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4699599A (en) * 1984-09-25 1987-10-13 Noennecke Ernst Ship's hull with a cantilevered elastic stern tube arrangement for the elastic mounting of the tailshaft
US4765075A (en) * 1985-08-08 1988-08-23 Sanshin Kogyo Kabushiki Kaisha Water propulsion unit of water jet propulsion craft
EP0450507A1 (en) * 1990-04-06 1991-10-09 Fabio Buzzi Device for regulating the inclination angle of a surface propeller shaft line as to the water plane
US5100350A (en) * 1990-04-06 1992-03-31 Fabio Buzzi Device for regulating the inclination angle of a surface propeller shaft line as to the water plane

Also Published As

Publication number Publication date
GB2061851B (en) 1983-07-13

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PCNP Patent ceased through non-payment of renewal fee