WO1994029169A1

WO1994029169A1 - High speed boat

Info

Publication number: WO1994029169A1
Application number: PCT/SE1994/000539
Authority: WO
Inventors: Lars Larsson
Original assignee: Svetssystem Ab
Priority date: 1993-06-03
Filing date: 1994-06-03
Publication date: 1994-12-22
Also published as: SE9301896L; SE501365C2; SE9301896D0

Abstract

High speed boats can be operated and steered by a water jet which is generated by a pump the shaft of which is directly coupled to a driving motor (10). According to the invention the engine shaft and the pump hub shaft parallel to each other and a driving belt is placed over the motor shaft and the peripheral ring of the pump.

Description

HIGH SPEED BOAT

The present invention refers to a high speed boat in which is used a pump driven by a driving motor constituted by for instance a petrol engine or a diesel engine. The pump pumps up water and generates a jet which can be directed and given different pressures, whereby such a boat can be propelled at a high velocity. Known boats has the driving motor directly coupled to the shaft of the pump and this has among other things the drawback that it becomes necessary to sometimes use a gear-box between the motor and the pump shaft. Further the shaft that drives the pump gives rise to certain flow problems.

The object of the present invention is to create a high speed boat of aforementioned type in which a gear-box can be dispensed with and where the pump can be operated conti¬ nuously. According to the invention this is made possible by the pump shaft being arranged parallel to the driving shaft of the engine and these two shafts located at a distance from each other. Directly on the driving shaft or on a wheel located on the driving shaft a driving belt is applied, which is placed over the external peripheral ring of the pump wheel. As mentio- ned the use of a gear-box thereby is avoided and further water flow disturbances of a driving motor shaft interconnected with a pump shaft are eliminated.

According to an advantageous embodiment of the present invention the peripheral ring of the pump is applied outside the stern of the boat and the same applies to the free end of the shaft of the driving motor so that the driving arrangement of pump ring, driving belt and engine driving shaft are located completely outside of the boat and form a single unit. According to an advantageous embodiment of the invention the pump ring, the driving belt and driving shaft wholly or partly are encapsulated in a protection housing. Further features concerning the present invention appear from the subsequent claims .

The present invention will be described in closer detail in connection with two drawings enclosed, in which Figure 1 shows a lateral view of the high speed boat,

Figure 2 shows the same boat seen from above, Figure 3 shows the stern of the boat according to the preceeding figures, Figure 4 shows an encapsulated driving arrangement, and

Figure 5 shows an illustration of a pump with a control nozzle for an emitted water jet.

In the figures the designation 8 refers to a high speed boat which contains a driving motor 10 and drives a pump shaft 11 with an adjustable outlet nozzle 15. The boat is arranged with a water intake 9 that provides the pump with water. As clearly and distinctly appears from of Figure 3 as the rear end of the pump 11 is shown, where a driving belt 13 is placed over the peripheral ring of the pump and the driving shaft 14 of the driving motor 10. The pump ring, the driving belt and the driving shaft 14 of the engine 10 are located outside the stern of the boat 8. These three elements may easily be encapsulated in a housing 16 as clearly and distinct- ly is shown in Figure 4. Consequently one has obtained a very convenient unit to mount at the stern of the boat 8. The pump

11 is on its outside provided with an adjustable outlet nozzle

15 which can be adjusted into different directions, in order to change direction of travel. The speed of the boat is con- trolled by the pump pressure.

The designation 14A refers to a coupling that joins the outgoing shaft of the driving motor 10 to a driving unit which constitutes the continuation of the shaft over which the driving belt 7 is going to be placed. The driving belt 7 runs further about the external circumference of the pump wheel about a ring which is opposite to the pump wheel hub and between which ring and hub the pump blades are arranged. In Figure 5 the nozzle is also shown which is utili¬ zed for directing the water jet. The nozzle is consequently pivotable partly about a horizontal axis, partly about an axis perpendicular to said axis. By the use of the arrangement comprising a pulley the speed of the boat without using a gear-box can have its speed controlled continuously. Further there is a great advantage to have a pump ring, a pulley and a driving shaft encapsulated in a single unit since this faciliates service of the driving unit.

Claims

PATENT CLAIMS

1. A high speed boat, which has a motor driving a pump, that pumps up water and generates a water jet, which propels the boat, which direction of the water jet controls the boat and which pressure of the water jet determines the speed of the boat, c h a r a c t e r i z e d therein, that the pump (11) comprises a hub (6) which is rotateably journalled and a peripheral ring of tube character mounted to the hub, whereby the pump blades are arranged between said hub and said ring, that the driving shaft of the engine (10) is parallel to the shaft of the hub and located at a distance from the same and that a driving belt, a driving chain or similar thereto is placed over said pump ring and driving shaft or over a wheel provided on the driving shaft.

2. A high speed boat according to patent claim 1, c h a r a c t e r i z e d therein, that said driving chain is provided on the outside of the boat together with the pump ring and the free shaft end of the driving motor.

3. A high speed boat according to patent claim 2, c h a r a c t e r i z e d therein, that the outside located parts are wholly or partly encapsulated.