JPS6327454B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a shaft supported in a wedge gap formed by a support disc, the support disc having a rotating surface consisting of an elastic coating; It concerns a support disc bearing (for example for the shaft of an open-ended spinning rotor), on which the shaft is pressed.

PRIOR ART It is known to radially support the shaft of an open-end spinning rotor in a wedge gap formed by a support disc and to press it against the support disc by means of tangential belts or pressure rollers. (Federal Republic of Germany Patent Application No. 1901453). The supporting disk is provided with a covering of a damping material, for example plastic, which ensures quiet rotation of the spinning rotor rotating at high rotational speeds and reduces noise. During operation, the rotating surface is exposed to considerable loads due to the high-speed rotating shaft being pressed against the rotating surface with the pressure required for the drive, and this load is transferred to the shaft via the existing unbalance and the supporting disc. It is further strengthened by the resulting axial thrust. This load causes relatively rapid wear and damage to the rotating surfaces and thus to the rotor bearings. It is necessary to replace the supporting disks, which in the case of a large number of spinning stations results in considerable costs due to material and assembly costs and loss of machine production time.

Object of the invention The object of the invention is to improve support disc bearings in such a way that the life of the rotating surface and thus of the rotor bearing as a whole is extended.

Structure of the Invention According to the present invention, this problem is solved as follows. That is, the rotating surface has at least one discontinuity formed by a cutout, which cutout is bridged by a tangent to the rotor axis.

Surprisingly, it has been found that if the rotating surface of the support disk is formed in accordance with the invention, the service life will be considerably increased.

Advantageous embodiments of the invention are described in the patent claims.

Description of examples Embodiments of the present invention will be described below with reference to the drawings.

According to FIG. 1, the shaft 1 of an open-ended spinning rotor, in particular with support disc bearings, is supported by a wedge of freely rotatable support discs 4 and 5 arranged in pairs on shafts 2 and 3. Supported within the gap. The support discs 4 and 5 have an elastic coating on their circumferential surface, which is made of plastic, for example polyurethane or other suitable material, and forms a rotational surface 40, 50 for the shaft 1. There is. The tangential belt 6 drives the shaft 1 of a predetermined size by pressing it against the rotating surfaces 40 and 50. Since such bearings are generally known, and therefore in particular the axial thrust acting on the shaft 1 via the support disc during the rotational movement, it is not necessary to describe it in any further detail. It doesn't come close.

As already explained at the outset, in this bearing the plastic sheathing is subjected to high loads by the shaft 1, which causes wear and damage to the rotating surfaces 40 and 50. To prevent this and to extend the life of the rotating surfaces 40 and 50, the rotating surfaces are interrupted by cutouts. These recesses can be configured and arranged in various ways.

However, a groove-shaped recess is advantageous, which extends in the direction of rotation of the support discs 4 and 5 and is arranged centrally between the rotation axes 40 and 50 (FIG. 2). The shapes of such endless grooves may be different. As shown in configurations a to d in FIG. 2, the grooves 7 can be wedge-shaped, square, semicircular or trapezoidal, for example. In configuration e of FIG. 2, two other grooves 7' extending parallel to the central groove are provided in parallel to the groove 7 disposed in the center, so that the circumferential surface of the rotating shaft 40 or 50 is , interrupted by three notches in total.

During operation, the shaft 1 is rotated by the rotating shaft 4 on both sides of the grooves 7, 7'.
0 and 50 and which can then become a contact surface if the pressing force of the shaft 1 on the elastic coating is large, freely bridges the groove. By placing the shaft 1 on both sides of the notch, the shaft 1 rolls without impact.

FIG. 3 shows another possibility of configuring the cutout interrupting the rotational surface. In configuration a, the groove 70 extends helically around the circumference of the rotating surface. Configuration b shows a rotational surface interrupted by a plurality of grooves 71 arranged at an angle to the direction of rotation of the support disk and spaced from one another. The angle and width of the grooves 71 are chosen such that the shaft 1 does not fit into the grooves, but bridges them. If the groove 71 extends to the edge of the rotating surface like the groove 70 in configuration a of FIG.
Conventional knowledge does not impair the shock-free rotation of the spinning rotor. This is because the surface of rotation for the shaft is sufficiently large in the extent that the groove extends beyond the edge. However, if this proves necessary, the grooves 71 or 70 may terminate before reaching the edge of the rotating surface.

Furthermore, plastic fins 8 may be inserted into the body of the support disk at a distance from one another, so that a rotating surface likewise interrupted by a recess is obtained. In configuration d of FIG. 3, the recess is formed by holes 9 arranged next to each other in the center of the rotating surface. In configuration e, the body of the support disk has a bridging piece 41 extending close to the rotating surface, which bridging piece forms a recess with the elastic covering.

The operation of the invention is based on the following. In other words, due to the rotation of the support disk, an air current is generated within the notch,
This air flow provides cooling of the elastic coating and thereby reduces wear caused by too high heat. In order to improve heat dissipation and thus prevent heat build-up which would lead to damage to the coating, the cut-out must have suitable dimensions. During experiments with a 6 mm thick coating, a notch depth of approximately 1/3 of the coating thickness, for example, was found to be particularly effective. Similarly, the width of the cutout is taken into account to ensure effective ventilation and therefore heat dissipation.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a support disk bearing of a rotor shaft driven by a tangential belt, FIG.
The figure shows a plan view, partially in section, of a further embodiment of a rotating surface interrupted by a cutout. DESCRIPTION OF SYMBOLS 1... Rotor shaft, 2, 3... Bearing shaft, 4, 5... Support disk, 6... Tangent belt, 7... Notch, 8... Fin, 40, 50... Rotating surface.

Claims (1)

[Scope of Claims] 1. The shaft is supported in a wedge gap formed by a support disk, and the support disk has a rotating surface made of an elastic coating, against which the shaft is pressed. (e.g. for the shaft of an open-end spinning rotor)
A support disc bearing characterized in that the rotating surfaces 40, 50 have at least one discontinuous portion formed by a notch, which notch is bridged by a tangent to the rotor axis. Support disc bearing. 2. The bearing according to claim 1, wherein the notches are formed in groove shapes 7, 7', 70, 71. 3. The bearing according to claim 2, wherein the rotating surfaces of the support discs 4, 5 are interrupted by endless grooves. 4. The bearing according to claim 2 or 3, wherein the groove 7 is arranged at the center of the rotating surfaces 40, 50. 5. The bearing according to claim 2, wherein the groove 70 extends spirally around the rotating surfaces 40, 50. 6. One of claims 2 to 5, in which the rotating surfaces 40, 50 are interrupted by a plurality of grooves 7, 7' extending in parallel over the circumference of the support disks 4, 5.
Bearings listed in. 7. Claims in which the surfaces of rotation 40, 50 are interrupted by a plurality of grooves 71 arranged at an angle to the direction of rotation of the support discs 4, 5 and spaced from one another. The bearing described in item 2. 8. The rotating surfaces 40, 50 are formed by covering fins 8 spaced apart from each other,
Bearing according to one of claims 1 to 6. 9. Bearing according to claim 1, in which the rotation surfaces 40, 50 are interrupted by holes 9 arranged next to one another. 10 The main bodies of the support discs 4, 5 have bridging pieces 41, which reach close to the rotating surfaces 40, 50 and form a notch together with the covering;
Bearing according to one of claims 1 to 6.