Device for converting rotary motion into axial motion
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United States of America Patent
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Oct 17, 2000
Grant Date -
N/A
app pub date -
Nov 25, 1998
filing date -
Jul 7, 1995
priority date (Note) -
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Abstract
A device for converting rotary motion into axial motion, having planetary rollers which are driven from a stationary drive housing by a drive shaft. These planetary rollers are held circumferentially at the same distance apart by a rotatable cage. The planetary rollers engage a thrust element via drive grooves on both the planetary rollers and the thrust element. The drive grooves on the planetary rollers do not engage the drive grooves on the drive shaft which frees the planetary rollers from harmful double engagement. The drive shaft drives these rollers via a gear tooth region on the rollers so as to function reliably and durably with a compact construction. The thrust element which is hollow, is therefore, able to move with a free thrust, i.e. without an additional guide element guiding it along a thrust path. Finally the thrust element has a high bucking strength so that it can withstand relatively large axial pressure.
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