Patent · US Expired

Worm gear

US4679458A · kind A · utility

5Cited by

7References

5Claims

0Family size

Assignee

AKTIEBOLAGET SKF · SE

Inventors

Manfred Brandenstein · Aschfeld, DE
Norbert Klupfel · Diez, DE
Gebhard Pape · Schweinfurt, DE
Roland Haas · Lendershausen, DE
Rolf Schmiechen · Schweinfurt, DE

Key dates

Filing date	Feb 13, 1986
Grant date	Jul 14, 1987
Priority date	—
Expiry date	Feb 13, 2006

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T74/19953
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A worm gear has a threaded spindle and a threaded nut, the thread on the spindle or the nut or on both having a profile such that the transition regions connecting the thread crown surface to the thread flanks are rounded, as is the crown surface itself. Further, the spindle thread and nut thread are intermeshed with axial and radial play such that radial forces exerted under torque loading are transmitted only by areas of the crown surface, which transmitted forces are supported by the respective areas of the opposing groove bottom. Smooth functioning is ensured even when the threaded spindle occupies a position of maximum inclination relative to the nut.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.