JPH04257327A - Fine spinning or twisting spindle - Google Patents

Abstract

PURPOSE: To improve noise problems of a spinning or a twisting spindle. CONSTITUTION: This spinning or twisting spindle is obtained by providing a spindle bearing housing 3 supported at an outer housing 14 with a connecting element 12 surrounding the spindle bearing housing 3 at a distance on the lower side of a step bearing 5 in the spinning or twisting spindle equipped with a spindle shaft 2 supported in the spindle bearing housing 3 by a neck bearing 4 and the step bearing 5. At this time, the connecting element 12 has a cross-sectional constricted part formed as a site of discontinuity 11 for limiting the transmission of a structure-borne sound and the flexural strength within the range of the site of the discontinuity 11 is the order of 100 N/mm. The intermediate space 21 between the spindle bearing housing 3 and the outer housing 14 contains a medium without transmitting the structure-borne sound to a significant extent.

Description

[Detailed description of the invention]

The present invention relates to a spinning or twisting spindle having a spindle shaft supported in a spindle bearing box by means of a collar bearing and a thin bearing, the spindle bearing box having a spindle bearing box on the underside of the thin bearing. relating to a spinning or twisting spindle, carried by a connecting element in an outer housing which surrounds the spindle at a distance and comprises attachment means to the spindle rail, said connecting element having a reduced cross-section forming a region of spring-elastic flexibility against bending; .

Although modern machinery and manufacturing methods allow spindles or thread spindles and their bearings to be manufactured with high precision, noise problems arise at spindle speeds above about 17,000 revolutions per minute. In this case, the rolling elements of the collar bearing are considered to be the essential noise source. Vibrations in the collar bearing area are transmitted as object sound to large machine elements via the spindle bearing housing, spindle flange, and spindle rail, thereby converting mechanical vibrations into sound. This is DE-C 2749
This also applies to spindles of the type mentioned at the outset, such as the one known from the US Patent No. 389. In this construction, a bearing housing is provided which receives a collar bearing and a full thin bearing (bearing elements in both radial and axial directions) and thus also holds the entire spindle in the axial direction. In this construction, the bearing housing is located directly below the collar bearing at the upper end of an intermediate pipe that otherwise remotely surrounds the bearing housing. The intermediate pipe is connected with its lower end below the thin bearing via a connecting element to the lower end of the outer bearing housing, which bearing housing is provided with means of attachment to the spindle rail and remotely surrounds the intermediate pipe. I'm here. In one embodiment, the bottom has a constriction to form a spring resilient section against bending. On the other hand, the intermediate spaces between the bearing housing and the intermediate pipe as well as between the intermediate pipe and the outer bearing housing communicate with each other through openings and are filled with oil, and this oil level is higher than that of the outer bearing housing. more than half the height of This oil dampens the vibrations of the spindle, which should improve the quality of the spindle's rotation. No sound reduction measures have been taken with this spindle.

The object of the invention is to design a spinning or twisting spindle of the type mentioned at the outset in such a way that the noise problem is significantly improved.

[0004] The aim is to configure the reduced cross-section as a discontinuity which limits the transmission of object sound, the discontinuity having a bending strength of 70 N/m in the case of radial loading in the collar bearing.
mm to 300 N/mm, and there is a medium whose sound velocity is 500 m/s or less in the intermediate space between the spindle bearing box and the outer housing, which are separated from the inside of the spindle bearing box. This is achieved by

Due to the discontinuities, object sound transmission is already largely blocked in the spindle bearing, so that only a small amount of high-frequency vibrations, which subsequently become acoustic, are transmitted to the outer housing and from there to the spindle rail and other machine parts. Furthermore, the outer housing itself provides isolation from the sound emitted from the spindle bearing housing. In this case, it is also provided that there is no medium in the intermediate space between the spindle bearing housing and the outer housing that can transmit object sound to a significant extent.

The constrictions in the connecting element which are present in the known construction according to DE-C 27 49 389 do not function as discontinuities which limit the object sound to a significant extent. The reason for this is that the intermediate space between the intermediate pipe and the outer pipe is filled with oil even in a narrow portion, so that object sound is transmitted through this oil.

In a further development of the invention, it is provided that the intermediate space between the spindle bearing housing and the outer housing is filled with grease at least in the area of the discontinuity. This further reduces noise generation. A similar effect can also be achieved if the intermediate space between the spindle bearing housing and the outer housing is filled with elastomer, at least in the area of discontinuities.

In a further embodiment of the invention, the thin bearing is divided into a radial bearing element and an axial bearing element, and the axial bearing element is supported in the axial direction by a coupling element. That is provided. This achieves that the spindle bearing housing is not loaded with tensile or compressive forces in its tubular part, but only with bending forces. Therefore, a clearer picture can be obtained regarding discontinuous locations.

Other characteristics and advantages of the invention will emerge from the following description of an embodiment shown in the drawings.

The drawing is a partial axial sectional view of a spinning or twisting spindle according to the invention mounted on a spindle rail.

The spinning or twisting spindle comprises a spindle shaft (2) fixedly connected to the upper part of the spindle, of which only its flywheel (7) is shown, which shaft is supported in a spindle bearing box (3). has been done. Shaft support is provided by collar bearings (4) with rolling elements, preferably rollers, which support the spindle shaft (4).
2) is supported in a bearing sleeve press-fitted into the upper end of the spindle bearing box (3). The lower end of the spindle shaft is supported by a thin bearing with a bearing sleeve (5) as a radial bearing element, the centering sleeve (8) being held at its upper end in the bearing sleeve.
) is maintained by For thin bearings, use bearing bolts (6)
Supplemented by, on this bolt the end of the spindle shaft (2) is carried. A damping spiral (9) is located between the centering sleeve (8) and the inner wall of the spindle bearing housing (3).
) is installed. The bearing bolt (6) connects the connecting element (1
2), which element is integrally molded with the spindle bearing box (3) and is held by the spindle bearing box (3).
3) on the underside of the thin bearings (5, 6) and the outer housing (1).
It is connected to the lower end of 4). The large walled outer housing (14) has a spindle rail (20) at its upper end.
) is fixed. The outer housing (14) is provided with an outer thread (16) in its upper end portion, onto which a nut (19) is mounted. Rings (17, 18) are installed on both sides of the spindle rail (20), at least one of which has an inclination, so that the angular position of the spinning or twisting spindle (1) depends on this ring, e.g. ) can be adjusted by rotating.

The bottom part (23) of the spindle bearing box (3), which receives the bottom plate (10) which receives the thin bearing bolt (6) and which axially supports the damping helix (9), has, as already mentioned, It is manufactured in one piece with the connecting element (12). The connecting element (12) has a cylindrical extension (13),
The extension has a larger diameter than the bearing housing (3) and is press-fitted from below into an outer housing (14) surrounding the bearing housing (3) with an intermediate space (21) remaining. The extension (13) is provided with an annular groove in which a packing ring (15) is inserted.
is inserted. The connecting element (12) forms a discontinuity (11) between the bottom (23) of the spindle bearing housing (3) and the extension (13), which significantly limits the transmission of object sounds. In the area of this discontinuity (11), the connecting element (12) has a bolt-like structure, the axial length of which is greater than its diameter. Due to its shape and the material selected, this bolt-like part exhibits a spring constant of preferably of the order of 100 N/mm in the region of the discontinuity (11) during radial loading in the area of the collar bearing (4). It is formed to have the same bending strength. Free-cutting steel is used as the material for the spindle bearing box (3) and the connecting elements.

The interior space of the bearing housing (3) is preferably filled with oil up to the upper end of the damping helix (9). Since the internal space is sealed outward, the oil flows into the intermediate space (21).
I don't get to that part. The intermediate space (21) contains a medium that is not suitable for object sound transmission. For example, the intermediate space (
21) Only air under atmospheric pressure can be admitted inside. In another embodiment, it is provided that the intermediate space is filled, preferably to about two-thirds of its height, with a medium that cannot transmit object sound to a significant extent. Grease filling is particularly suitable in this case. However, elastomers with these properties are also suitable.

The outer housing (14) is formed in such a way that it has a much higher mass than the spindle bearing housing (3). To this end, it is provided that its wall thickness is at least four times the wall thickness of the spindle bearing housing (3). In addition, it is provided that the axial moment of inertia of the outer housing (14) is greater than the axial moment of inertia of the spindle bearing housing (3), preferably approximately 10 times greater.

[Brief explanation of the drawing]

1 is a partial axial sectional view of a spinning or twisting spindle according to the invention mounted on a spindle rail; FIG.

[Explanation of symbols]

1 Spindle 2 Spindle shaft 3 Spindle bearing box ４　　　　Brim bearing 5 Thin bearing 11 Discontinuous points 12 Connected elements 14 Outer housing 20 Spindle rail 21 Intermediate space

Claims (7)

[Claims] 1. A spinning or twisting spindle comprising a spindle shaft supported in a spindle bearing box by means of a collar bearing and a thin bearing, the spindle bearing box being separated from the spindle bearing box on the underside of the thin bearing. In a spinning or twisting spindle, said spinning or twisting spindle is carried by a connecting element in an outer housing surrounding and provided with means of attachment to the spindle rail, said connecting element having a reduced cross-section forming an area of elastic flexibility against bending. Discontinuous points (11
), the discontinuities have a bending strength between 70 N/mm and 300 N during radial loads in collar bearings.
/mm, and the spindle bearing box (3) is separated from the inside of the spindle bearing box (3).
) and the outer housing (14).
A spinning or twisting spindle, characterized in that there is a medium whose sound velocity is 500 m/s or less. 2. Spinning or twisting spindle according to claim 1, characterized in that the connecting element (12) is produced in one piece with the spindle bearing housing (3). 3. Spinning or twisting spindle according to claim 1, characterized in that the reduced cross-section section has at least approximately the shape of a bolt and its length is greater than its diameter. 4. The intermediate space (21) between the spindle bearing housing (3) and the outer housing (14) is filled with grease at least in the area of the discontinuities (11). The spinning or twisting spindle according to any one of 1 to 3. 5. The intermediate space (21) between the spindle bearing housing (3) and the outer housing (14) is filled with an elastomer at least in the area of the discontinuities (11). The spinning or twisting spindle according to any one of 1 to 3. 6. Spinning or twisting spindle according to claim 1, characterized in that the outer housing (14) has a higher moment of inertia than the spindle bearing housing (3). [Claim 7] The thin bearing is a radial bearing element (5)
and an axial bearing element (6), and said axial bearing element (6) is divided into a connecting element (6) in the axial direction.
Claims 1 to 6 characterized in that they are supported by 12).
A spinning or twisting spindle according to any of the above.