DE2928500A1 - DRIVE DEVICE FOR SHIPS - Google Patents

Description

Scatra AB - ü - /.a. υ around.

Fack St / Nb

S-14902 Nynäshamn Cl

Propulsion device for ships

The invention relates to a propulsion device for ships with a drive unit and a serving to transmit torque to the propeller, connected to a propeller shaft Ship propulsion shaft, the propeller shaft through a water-lubricated, rubber bearing in the stern post the hull is passed through and to the rear End of the ship's drive shaft extends.

In such drive devices it has already been proposed to reduce vibrations and sound transmissions, the entire drive unit with the drive shaft and to store the propeller shaft elastically (DE-OS 2 303 723). The disadvantage of this drive device is that the entire drive unit with the associated drive shaft can be mounted elastically, but it must be the case with the entire drive device Occurring vibrations are dampened so that they are not transferred to the hull and thereby vibrations and make excessively loud noises. Because of the special Arrangement requirements, a considerable amount of space is required and the designer is in the choice of the arrangement restricted in the hull. The usable space is reduced if it does not have the additional disadvantage of vibrations (vibrations, Roar) want to bargain.

Q30064 / 047V.
ORIGINAL INSPECTED

C 1 - St / Nb - k - June 28, 1979

Proceeding from this, it is the object of the invention to provide a drive device to create that ensures smooth running, d. H. a transmission of the vibrations of the drive shaft and the propeller shaft largely switches off, the individual arrangement of the units belonging to the drive device is retained.

To solve this problem it is provided according to the invention that

a) the bearing coaxially facing the propeller shaft has a first layer consisting of hard rubber and

b) a second layer of soft rubber is arranged coaxially therewith,

c) the bearing is accommodated with its outer surface in a tubular component,

d) the tubular component has an inner and outer jacket, which consists of a material that has a high specific weight and a middle layer, its specific Weight is light.

It is advantageous in this embodiment that the propeller shaft still in a water-smeared rubber mount on the aft stevens is held, but the hard rubber layer necessary for storage is not in contact with the hull, so that the Occurring vibrations and noises are absorbed by the additional outer layers.

According to a further essential feature it is provided that

e) the tubular component made of two metal tubes and one in between Soft rubber layer consists.

By using two metal tubes with a high specific Weight, it is easily possible that vibrations as well as noises are not transferred from the inner tube to the outer tube can be transferred, as the intermediate soft rubber layer reduces these stresses to a considerable extent.

030064/0471

C 1 - St / Nb - 5 - June 28, 1979

It is also provided that

f) the second layer of the bearing in relation to the first Layer is at least twice as large in cross section.

Due to the appropriate dimensioning of the hard rubber layer, which is arranged directly on the propeller shaft and the corresponding thick soft rubber layer prevents the vibrations from being transmitted, because the actual bearing function is fulfilled by the hard rubber layer and takes over the fixation of the bearing as well as the reduction of the stresses the soft rubber layer.

According to a further feature it is provided that

g) the second layer is distributed over the circumference and has axially extending blind bores which extend over approximately 2/3 of the length of the camp.

Through these axially extending holes in the soft rubber, this layer becomes even more elastic, so that a further improvement occurs, additionally due to the deformation of the bores Another pump effect acts on the lubricant water, so that a forced compression of this medium takes place.

In a further embodiment it is provided that the bores run alternately starting from different end faces of the camp.

Preferred embodiments according to the invention are shown in Drawings shown schematically.

It shows:

1 shows a schematically illustrated hull with a drive unit and a propeller shaft

030064/0471

C 1 - St / Nb - 6 - June 28, 1979

2928!

Fig. 2 shows a propeller shaft as a single part with a bearing enlarged in section.

In Fig. 1, a schematically illustrated hull 1 is shown, the drive device of a drive unit motor 2 and a propeller 1 connected to a propeller shaft 3. The motor 2 is elastic via bearings 5 recorded in the hull 1. It can perform movements relative to the hull 1,. ·, So that these movements are carried out by a PTO shaft 6 must be balanced. The propeller shaft 3 is in a water-lubricated bearing 7 through the stern post of the hull 1 passed through. This bearing consists essentially of rubber and avoids the transmission of noises and vibrations on the hull 1. Slight relative movements of the propeller shaft 3 are also caused by the bearing 7 caught.

In Fig. 2, a propeller shaft 3 is shown, which is attached at one end to a propeller 4 and at the other The end is connected to a shaft seal 9 via a pipe 8. The water-lubricated bearing 7 consists of a. layer

10, in this case made of hard rubber and another layer

11, which is made of soft rubber. These two layers 10 and 11 are located in a tubular component 12, the outer and inner lateral surfaces 13 and 14 made of metal and both are connected to one another by a vulcanized soft rubber layer 15. The vibrations of the propeller shaft 3 are transferred from the hard rubber layer 10 to the soft rubber layer 11 and are essentially absorbed by the latter. The fixation of the bearing in the hull 1 takes place through the tubular component 12 with its outer jacket surface 13.

030064 / CH7!

C 1 - St / Nb - 7 - June 28, 1979

In Figures 3a, 3b and 3c, the additional flexibility of the soft rubber serve and, in addition, when this soft rubber is deformed, a pumping action is carried out which results in the forced circulation of the Serve water. The soft rubber layer 11 is in all versions 3a to 3c received in the tubular component 12, which, as the section in FIG. 2 shows, consists of three layers, the layers 13 and 14 having a specific high weight should and the layer 15 has a specific low weight.

During the operation of such a propeller shaft flows into water in the entire cavity 18; this water is going through the shaft seal 9 and its contact seal 19 prevented , get into the interior 20 of the hull 1 ζμ.

03006 4/0471

Claims (5)

Pack St / Nb S-14902 Nynäshamn Cl patent claims 1. Propulsion device for ships with a drive unit and one for torque transmission to the propeller serving, with a propeller shaft connected to the propeller shaft, the propeller shaft being driven by a water-lubricated, made of rubber bearing in the stern of the hull is passed through and to the rear The end of the marine propeller shaft extends, characterized in that a) the bearing (7) facing the propeller shaft (3) coaxially has a first layer (10) made of hard rubber, b) and a second layer (11) made of soft rubber is arranged coaxially therewith, c) the bearing (7) with its outer surface in a tubular shape Component (12) is added, d) the tubular component (12) has an inner (14) and outer jacket (13) which consists of a material which has a high specific weight _/ and a middle layer (15) whose specific weight is low. 2. Drive device for ships according to claim 1, characterized in that e) the tubular component (12) made of two metal tubes (13, 14) and an intermediate soft rubber layer (15) consists. 030064/0471 Cl - St / Nb - Σ - June 28, 1979 3. Drive device for ships according to claim 1, characterized in that f) the second layer (11) of the bearing (7) in relation to the first layer (10) in cross section at least twice is great. 4. Drive device for ships according to claim 1, characterized in that g) the second layer (11) distributed over the circumference, has axially extending blind bores (17) which are approximately Extend over 2/3 of the length of the bearing (7). 5. Drive device for ships according to claim 1 and 4, characterized in that that the bores (17) run alternately from different end faces of the bearing (7) starting. 030064/0471 ORfGlNAL INSPECTED