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Patent Searching and Data


Title:
POWER SCREW SYSTEM
Document Type and Number:
Japanese Patent JPH01210655
Kind Code:
A
Abstract:

PURPOSE: To make an outer tube for circulating balls unnecessary by forming, in adjacent faces of an inner and an outer hollow elements which constitute a ball nut, ball circulating means for returning balls in any parts of helical grooves of a ball screw.

CONSTITUTION: A ball nut 12 is constructed by an inner hollow element 14 that surrounds a ball screw 11 and an outer hollow element 15 that surrounds the inner hollow element 14. Helical grooves 20, 21 working in cooperation with two helical grooves or running paths 17, 18 of the ball screw 11 are formed in an inner side 19 of the inner hollow element 14. Further, non-end ball circulating paths 24, 25 are provided with ball connectors 26 for moving balls 22, 23 from the helical grooves 17, 20 and 18, 21 to ends 27, 28 of helical grooves 28, 86. The helical grooves 28, 86 are within a scope slightly exceeding 180 degrees. Consequently, a ratio of axial movement at one rotation can be increased to minimize the length of the ball nut and decrease inertia, and meanwhile an outer tube for circulating the balls is unnecessary.


Inventors:
RARUFU DABURIYUU MEIFUIIRUDO
Application Number:
JP1988000313657
Publication Date:
August 24, 1989
Filing Date:
December 12, 1988
Export Citation:
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Assignee:
CINCINNATI MILACRON INC
International Classes:
F16H25/22; (IPC1-7): F16H25/22