FI74526C - NEDRE LAGER FOER RODERAXELN. - Google Patents

Description

74526

STEERING SHAFT LOWER BEARING - NEDRE LAGER FOR RODERAXELN

The invention relates to a lower bearing for a ship's rudder shaft.

The lower bearing of the ship's rudder shafts is usually constructed as cylindrical bearings allowing rotation and displacement in the axial direction.

High loads on the rudder and thus against the rudder shaft create a considerable torsion against the upper and lower opposite edges of the bearing as the rudder shaft thus assumes a curved line outside the theoretical vertical axis of the rudder shaft. At the same time, the movement of the rudder shaft compared to the lower bearing increases.

The 3y1interlined bearing naturally allows displacement in the longitudinal direction of the rudder shaft, but it is not designed to receive these undesirable forces, which e.g. are generated by higher loads on the rudder.

This means that the known cylindrical bearing is subject to high wear and extreme load.

In the bearing according to the invention, these undesirable effects are avoided by the features of the characterizing parts of the claims.

; The bearings according to the invention allow the rudder shaft to bend in the region of the bearing and at the same time to move in the longitudinal direction between the rudder shaft and the bearing. In particular, in the case of a spherical upper bearing, possibly connected to a torque motor, an ideal rudder shaft bearing is provided to receive thrust forces generated by high loads on the rudder and thus the rudder shaft bends between the two bearings as well as the rudder shaft in the inclined position and transition in the lower bearing.

The drawing shows a longitudinal section of the lower bearing. The attachment of the bearing to the ship is not shown.

74526

The rudder shaft 1 has a part with an extended diameter, in which a wedge groove 2 is arranged on the circumference. The bearing sleeve 4 surrounds the rudder shaft 1 and is provided with a wedge groove 3 extending along the entire length of the sleeve or only over the lower, larger part, as shown by reference numeral 10. The wedges 9 are placed in the wedge groove 2 on the rudder shaft 1 Thus, the rudder shaft 1 can be moved in the axial direction while the wedges 9 move in the wedge groove 3 or in the bearing sleeve 4 and remain in the wedge groove 2 of the rudder shaft 1.

The sleeve 4 is provided on its surface with a bearing material 5, such as polyamide, and the sleeve has a spherical upper surface 6. The bearing material 5 is formed into two partially spherical rings, upper and lower, bounding against the upper part 8 and the lower part 7 of the bearing sleeve. The upper and lower parts of the bearing sleeve 7, 8 are pressed against each other in a known manner, thus obtaining sufficient support. The sleeve is attached to the hull of the ship in a known manner.

When the rudder shaft 1 is possibly displaced compared to the bearing sleeve 4, a longitudinal displacement, such as due to the expansions of the rudder shaft as well as the displacement caused by bending, is possible. In addition, the bearing allows the rudder shaft to bend in the bending region due to the upper spherical shape of the 1 aa ball.

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Claims (3)

3,74526 A lower bearing of a ship's rudder shaft, of the type in which axial, rotational and lever movement of the shaft or bearing is permitted, characterized in that the rudder shaft (1) is surrounded by a bearing sleeve (4) with keyways (3) arranged in the rudder shaft to receive the wedges (9), allowing axial displacement of the rudder shaft (1) and preventing its rotation relative to the bearing sleeve (4), and that the bearing sleeve (4) has a spherical bearing element (5) having a convex spherical surface movable from a movable two-part bearing sleeve 7 , 8) against a concave spherical surface, the second part being fixed in a known manner to the hull of the ship, thus allowing the rudder shaft (1) to rotate about its axis relative to the bearing sleeve (4) and at the same time fold the rudder shaft under load under its normal position. Bearing according to Claim 1, characterized in that the wedge grooves (3) of the bearing sleeve extend beyond the lower major part of the height of the bearing sleeve (4). Bearing according to Claim 1, characterized in that the wedge grooves (3) of the bearing sleeve (4) are designed to be continuous through the height of the bearing sleeve (4).