CS232385B1 - Generating burr with vaulted profile - Google Patents

Abstract

The invention can be used in various mechanisms with a pulley, which ensure the coupled movement of two bodies with extreme loads at the point of contact by rolling the pulley, e.g. in tappets of injection devices for diesel engines and in other piston hydraulic pumps.

Description

Rolling roller with curved profile of the rolling surface

The invention can be used in your pulley mechanisms which provide the coupled movement of two bodies with extreme loads at the point of contact, such as the strokes of injection molding machines for diesel engines and other piston hydraulic pumps, by means of the pulley.

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BACKGROUND OF THE INVENTION The invention relates to a roller of a rolling mechanism, in particular a roller for high radial loads, with a specific longitudinal section profile with a peripheral surface.

The rollers of the rolling mechanism used so far, which ensure the mutual movement of the two bodies by their rolling, have a generally cylindrical peripheral surface. However, this shape of the peripheral surface is suitable only for low radial load of the pulley due to uneven contact stress in the contact surface of the contact and to the risk of pitting on exposed parts of the surface. For higher radial loads, rollers are designed in which the shape of the circumferential surface is solved by vaulting a longitudinal section of a circular arc of a large constant radius in order to reduce uneven contact stress. The constant curvature of the profile, however, prevents the contact load from becoming more uniform.

The drawbacks of the rolling rollers with an arched profile of the circumferential surface are overcome by the roller according to the invention in that its circumferential surface has a longitudinal cross-sectional profile of a hyperbola portion. Using a hyperbolic profile results in a relative reduction in the radius of curvature at the center of the contact width, thereby increasing stress at the middle portion of the contact, but reducing stress peaks in the critical region where the radius of curvature of the hyperbola is relatively greater. Compared to the krah profile, a more even distribution of stress is achieved with low technological difficulty of production.

A similar effect could also be achieved with other profiles whose radius of curvature increases from the center of the pulley, e.g. parts of the general curve. However, the technological difficulty of producing such profiles would be considerably higher.

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An exemplary embodiment of a pulley according to the invention is shown in the accompanying drawing, in which Fig. 1 schematically shows the course of contact stress in cross-section along the contact surface of the pulley washer;

As can be seen in FIG. 1, the contact stress <T in cross section along the contact surface of the pulley washer with a width s under a constant load for different pulley transverse profiles has a different course. The greatest unevenness is shown by the cylindrical profile P, the stress profile at the circular profile K is much better and the best results are shown by the hyperbolic profile H.

An embodiment of the inventive pulley with a profile according to the invention is shown in Fig. 2, showing a pulley 1 rolling over the body 2 and rotatably mounted on a pin 2 housed in the holder 4. The curved profile 5 of the circumferential surface of the pulley .

The invention can be used in various fields of mechanical engineering with rolling or copying mechanisms.

SUBJECT OF THE INVENTION

Claims (2)

232 385 Rolling roller with an arched profile of the rolling surface, characterized in that its peripheral surface has a profile of hyperbola in longitudinal section through the axis of the roller » 2 drawings 232 385 GIANT. 1 232 38S