DE19937040A1 - Shaft bearing comprises two axial bearings arranged one behind other, axial loading of at least one bearings being adjusted by hydraulically operated piston - Google Patents

Abstract

The shaft (1) bearing comprises two axial bearings (3, 5) arranged one behind the other. The axial loading of at least one of the bearings can be adjusted by a hydraulically operated piston (9).

Description

The invention relates to a bearing arrangement according to the Oberbe handle of claim 1.

Such bearing arrangements are generally known as tandem Axial bearing arrangements known. You will be increasing axial load capacity used in a small space, where two or more thrust bearings of the same size in a row which are switched. The individual bearings are by springs de cans put together, which creates an even Adequate load distribution results.

These arrangements are sensitive to shaft misalignment and are not suitable for highly loadable spherical roller bearings ger.

It is the object of the invention to develop a bearing arrangement to create several thrust bearings, in which the load distribution is adjustable to the different camps.

This object is achieved by a bearing arrangement with the characterizing features of claim 1 solved.  

The arrangement according to the invention turns out on a Bear an exactly predictable adjustable constant load on.

The bearing also bears in an advantageous manner at Wellenschief positions evenly over the entire circumference.

Through the invention it is possible during operation, the Bearing load to adapt to the external load conditions, whereby at no axial displacements under the various loads the wave occur.

The invention is described below using an exemplary embodiment are explained.

Fig. 1 shows a half section longitudinally through the schematic representation of an inventive shaft of the. At the end, not shown, an axial force, for. B. initiated by the thrust of a ship's propeller in the shaft ( 1 ).

The shaft ( 1 ) has a radial bearing ( 2 ) to support the radial forces that occur on this side.

The shaft ( 1 ) is supported by means of a shoulder ( 1 a) on the inner ring ( 3 a) of a first axial bearing ( 3 ). It can be installed between paragraph ( 1 a) and the inner ring ( 3 a) also Zwischenrin ge for precise axial positioning of the thrust bearing ( 3 ). The outer ring ( 3 b) is guided radially in a sleeve ( 15 a), but can also be free in the radial direction and is supported in the axial direction on an intermediate piece ( 15 b) of the housing ( 15 ). For the axial preload springs ( 4 ) are provided, which are inserted into the end holes of the intermediate piece ( 15 b). These holes are evenly distributed on a bolt circle, whose diameter is chosen so that the springs ( 4 ) on the outer ring ( 3 b) press.

In this exemplary embodiment, the housing ( 15 ) consists of the sleeve ( 15 a), the intermediate piece ( 15 b) and a cover ( 15 c). The individual parts of the housing ( 15 ) are screwed together and BEFE Stigt on the gearbox or on a main housing. However, it is also possible to design the housing ( 15 ) in one piece.

The inner ring ( 5 a) of a further axial bearing ( 5 ) bears against a further shoulder ( 1 b) of the shaft ( 1 ). This Axialla ger ( 5 ) supports the shaft ( 1 ) via its outer ring ( 5 b), which is supported in the axial direction on a piston ( 9 ).

From the illustration it can be seen that in this embodiment approximately two thrust bearings ( 3 , 5 ) of different construction size are used. In other constructive configurations, bearings of the same size ( 3 , 5 ) can also be combined with one another, and arrangements are also possible which consist of both roller and plain bearings.

At the annular contact surface of the piston ( 9 ) to the outer ring ( 5 b) holes are evenly distributed on a bolt circle, in the springs ( 6 ) are inserted for the axial preload of the axial bearing ( 5 ).

The piston ( 9 ) is introduced into the intermediate piece ( 15 b) with radial play, which results in a gap ( 7 ) over its entire circumference. Due to the gap ( 7 ), the piston ( 9 ) within the intermediate piece ( 15 b) is angularly movable and adapts to any angular misalignment of the shaft ( 1 ) that may occur. As a result, the thrust bearing ( 5 ) carries the load evenly over the entire circumference, even in angular misalignment.

The pressure-tight sealing of the pressure chamber ( 10 ) takes place on the piston ( 9 ) by means of a flexible sealing element ( 8 ), which is inserted into a recess on the circumference of the piston. In the axial direction, the pressure chamber ( 10 ) is delimited in a pressure-tight manner by the cover ( 15 c) of the housing ( 15 ).

On the cover ( 15 c) there is a through hole which serves as a pressure connection ( 11 ) for oil supply lines. An oil pump ( 14 ) builds up an oil pressure, which is fed to the pressure chamber ( 10 ) at a precisely adjustable height via a pressure regulating valve ( 12 ).

The desired axial load of the thrust bearing ( 5 ) is set by the oil pressure with which the piston ( 9 ) is impacted. The oil pressure can be easily calculated based on the desired load and the design piston area.

The oil pressure on the pressure control valve ( 12 ) can be set manually or by a control unit ( 13 ), which determines the required oil pressure according to the external load conditions from various input variables and controls the pressure control valve ( 12 ) continuously.

In the example described, the arrangement of two Bearings are explained in other constructive versions arrangements of three or more thrust bearings are also possible, where the load pickup is set at two or more bearings is cash.

In a further example not shown in the drawing, the axial adjustment of the thrust bearing ( 3 ) is carried out by an electromagnetic force. The piston ( 9 ) is connected to the armature of an electromagnet, which is mounted on the housing ( 15 ) instead of the cover ( 15 c). The force with which the armature presses on the piston ( 9 ) or a pressure plate on the outer ring ( 5 b) can be regulated via the electric current. The electromagnet can be controlled, for example, by a manually operable current regulator or by a corresponding control unit.

Reference list

1

wave

1

a paragraph

1

b paragraph

2nd

Radial bearing

3rd

Thrust bearing

3rd

a inner ring

3rd

b outer ring

4th

feather

5

Thrust bearing

5

a inner ring

5

b outer ring

6

feather

7

gap

8th

Sealing element

9

piston

10th

Pressure room

11

Pressure connection

12th

Pressure control valve

13

Control unit

14

Oil pump

15

casing

15

a rifle

15

b intermediate piece

15

c lid

Claims (9)

1. Bearing arrangement on a shaft with at least two axial bearings arranged one behind the other, characterized in that the axial load bearing of at least one of the axial bearings ( 3 ; 5 ) by a piston ( 9 ) is adjustable. 2. Bearing arrangement according to claim 1, characterized in that the piston ( 9 ) can be acted upon with an oil pressure which is adjustable in height by a pressure control valve ( 12 ). 3. Bearing arrangement according to claim 2, characterized in that the pressure control valve ( 12 ) can be controlled by a control unit ( 13 ). 4. Bearing arrangement according to claim 1, characterized in that the piston ( 9 ) is angularly movable. 5. Bearing arrangement according to claim 1, characterized in that the axial bearing ( 3 ; 5 ) by means of springs ( 4 ; 6 ) can be axially preloaded. 6. Bearing arrangement according to claim 1, characterized in that the axial bearing ( 3 ; 5 ) have different sizes. 7. Bearing arrangement according to claim 1, characterized in that the axial bearings ( 3 ; 5 ) are roller or plain bearings. 8. Bearing arrangement according to one of the preceding claims, characterized in that the shaft ( 1 ) with a shoulder ( 1 a) on the inner ring ( 3 a) of a first axial bearing ( 3 ) and the outer ring ( 3 b) on the housing ( 15 ) is supported and that the shaft ( 1 ) is supported with a further shoulder ( 1 b) on a second thrust bearing ( 5 ), the outer ring ( 5 b) of the second thrust bearing ( 5 ) abutting a piston ( 9 ) which is is supported on the housing ( 15 ) via a liquid-pressurized pressure chamber ( 10 ), which is connected to an oil pump ( 14 ) via a pressure connection ( 11 ) and a pressure control valve ( 12 ). 9. Bearing arrangement according to claim 1, characterized in that the piston ( 9 ) can be acted upon by an electromagnetic force.