DE8530850U1 - Coil spring - Google Patents

Description

SKF GmbH Schweinfurt, October 29, 1985

DE 85 018 DE TPA / ko / mh

Coil spring

The innovation relates to a coil spring according to the preamble of the main claim.

Springs, as for this application mentioned, are used in various places in mechanical engineering. They are wound from spring steel wire and have several turns. In order to create appropriate contact surfaces, the spring ends of compression springs are usually placed on the subsequent turn, ie by reducing the pitch of the last turn, it is almost bent into a radial plane. The resulting end face is often sanded, so that a precise contact surface is created. The end of the spring in question is greatly weakened in terms of wire thickness and ends at an acute angle.

In relevant specialist books, for example Daughtermann / Bodenstein, construction elements of mechanical engineering, Springer-Verlag, will be the basis of calculation for the expert and instructions for the production of Sohraubenfedern are given. It can be read that the endpoints of the final

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fenden turns offset from each other by about 180 ° should lie, ϊη in practice has shown, however, that coil springs produced according to these recommendations are not or only not for the application mentioned can be used with significant defects. When compressing such a known spring under exactly axial Directed force is this on one of the other spring side serving as a plant surface not uniform r direction * exceeded. The bsk ^ nnt a radially directed force component on this contact surface. Since in the application mentioned a roller bearing forms this contact surface, this is radially pretensioned and with a corresponding movable arrangement also shifted radially. The entire arrangement of spring and roller bearing then does not form any coaxial alignment other machine parts more. Since the radially directed force component increases steadily with the travel distance covered changes, constantly changing displacements of the rolling bearing must be expected. For similar use cases detrimental effects are to be expected, at least the precise operating behavior such arrangements interfere and lead in the long term to the premature failure of sensitive machine parts can.

The task of the innovation is to provide a coil spring To create the type mentioned above, which ensures an exclusively axial transmission of the compressive force.

The object is achieved in that the number of turns of the helical spring is an integer.

As a result, the spring ends meet at the same circumferential point, but axially separated from one another, i.e. at one axially running surface line together. Because only completely

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Numerous turns are provided, the coil spring according to the invention has at each point of its extent the same spring properties because the same number of spring coils is effective at every point. The production a radial force component within the helical spring is advantageously excluded. This surprising effect has been found in trials

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moderate spring with one end face over a linearly movable one Rolling bearing washer supported on a flat steel plate with a high quality surface. The roller bearing disc was able / due to the excellent rolling properties to give way in all radial directions. Thereafter the spring was loaded with a pure axial force and compressed over the entire spring travel. Radial on Dial gauges arranged on the roller bearing disc showed no significant deflection.

According to a further feature of the innovation, the spring ends are applied to the respective subsequent coil and have, on the side facing this, a contact surface which is inclined in accordance with the slope of this turn. When the last turn of the coil spring is only on the subsequent applied and then the face is ground flat, the result is a very pointed shape tapering spring end or a contact line over a wide circumferential area. By grinding the end of the spring on the side facing away from the end face, the end of the spring can be completely deformed by deforming the last turn be laid out in more detail. The end of the spring only has to be ground flat over a short length, which means the uniformity of the resilience is optimized over the circumference of the helical spring.

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The innovation is described below using the example shown in the drawing.

Show it:

1 shows a helical spring with applied spring ends that meet at a point on the circumference and

FIG. 2 shows the enlarged section of one of the spring ends according to FIG. 1.

The helical spring shown in FIGS. 1 and 2 is wound from spring steel wire and designed as a compression spring. As a result, there is a 1 between the windings Distance 2 is provided and the end faces 3 are designed as flat contact surfaces. The spring ends 4 are separated so that an integer number of turns results. The spring ends 4 meet a common one axial surface line 5, i.e. they meet with regard to the winding direction at an angular point of the Omfanges. The outer turns on both sides 1 are each bent to the adjoining one, with the spring ends 4 each coming into contact with this. In the area of the system are the spring ends 4 with a slope corresponding to the subsequent winding 1, ground, inclined surface 6 provided. This is particularly evident from FIG. 2. The end faces 3 are machined flat after the spring has been completely formed and the inclined surface 6 has been produced by grinding, so that they lie in a radial plane.

Claims (2)

SKF GmbH Schweinfurt, October 29, 1985 DE 85 018 DE TPA / ko / mh helical spring protection claims 1. Coil spring for axial adjustment and displacement a roller bearing, the roller bearing axially against the radial flange via the helical spring one? HülTenmantels or the like. Is employed, thereby characterized in that the number of turns (1) of the helical spring is an integer. 2. Helical spring according to claim 1, characterized in that that the spring ends (4) are applied to the respective subsequent turn {1) and to the this facing side has a contact surface (6) that is inclined in accordance with the slope of this winding (1) exhibit. '• ■ Ill Il suffered Il I I ι ι I I I I 1 * 1 * I t Il # 11 * I I llll · ··!