Machine element or mechanism – Gearing – Teeth
Reexamination Certificate
1999-10-29
2001-04-24
Wright, Dirk (Department: 3681)
Machine element or mechanism
Gearing
Teeth
Reexamination Certificate
active
06220110
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the invention
The present invention relates to a ball recirculation block of leadscrew, and more particularly, to a leadscrew ball recirculation block having oil storing means.
2. Brief description of the prior art
A leadscrew assembly is conventionally constituted of a screw shaft, and a ball nut unit combined thereof together with a plurality of balls recirculating therebetween, wherein the outer surface of the screw shaft is formed into a spiral groove having semi-circular-liked cross section. The ball nut unit further includes a nut body and other components which carry balls to recirculate. The nut body is hollow with its inner surface formed into a spiral groove of semi-circular-liked cross section corresponding to the spiral groove formed on the outer surface of the screw shaft thereof. By recirculation of the balls, screw shaft and the nut unit are able to rotate relatively.
Usually, the ball recirculation block for a conventional leadscrew assembly has no oil storing means because it is believed that too big investment is required to add extra oil storing means to a leadscrew assembly.
SUMMARY OF THE INVENTION
The present invention has thus been made in view of such conventional problem. Accordingly, it is an object of the present invention to provide oil storing means in unutilized space of leadscrew ball recirculation block.
It is another object of the present invention to provide oil storing means for a leadscrew assembly without aggravatively increasing the manufacturing cost.
It is still another object of the present invention to provide oil storing means for a leadscrew assembly with improved oil storing effect to prolong the usable duration of oil stored in the leadscrew assembly without replenishing new oil repeatedly at short intervals.
To achieve the objects mentioned above, in the oil storing ball recirculation block of the present invention, an cavity in the ball recirculation block which being not used effectively is utilized for storing oil, an oil exuding hole is provided to communicate with the oil stored cavity and a turning passage for balls so as to lubricate the moving balls. In order to prevent the oil remained at a standstill in a certain region of the cavity by its own gravity from failing to lubricate the balls, the present invention provides an oil containing element with a plurality of oil absorbing and distributing branches to absorb oil remained anywhere and transport oil to lubricate the balls just passing along the turning passage. Furthermore, the ball recirculation block is formed of two pieces of plastic members bonded by supersonic wave bonding technique so as to achieve reduction of manufacturing cost and ensure perfect oil sealing effect of the ball recirculation block. With the result of such a construction, the usable lifetime of the ball leadscrew is prolonged and repeated replenishing of new oil is evaded. Incidentally, blanket, flannel and cotton cloth thread can be used to form the oil containing element.
REFERENCES:
patent: 5809838 (1998-09-01), Miyaguchi et al.
patent: 5906136 (1999-05-01), Yabe et al.
patent: 6023991 (2000-02-01), Yabe et al.
Kuo Chang-Hsin
Yang Paul
Dougherty & Troxwell
Hiwin Technologies Corporation
Wright Dirk
LandOfFree
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