Ball screw

Details Ball screw Ball screw

2005-12-27

2005-12-27

Hannon, Thomas R. (Department: 3682)

Machine element or mechanism

Gearing

Directly cooperating gears

C074S424750, C074S424810, C074S424820

Reexamination Certificate

active

06978693

ABSTRACT:
The invention is a ball screw, comprising: a shaft having a spiral-shaped shaft; a nut having a spiral-shaped nut ball groove and screwed with the shaft via a plurality of balls; and a ball circulation passage for raking the plurality of balls at one end of the ball rolling, wherein an end part of the ball circulation passage is connected to one end part of the ball rolling passage in such a manner that: a gap Δt formed between a ball contacting part of the nut ball groove contacted with the ball and an inner circumferential surface of the end part of the ball circulation passage is set 0.2 mm or less; and a change of angle in a ball rolling direction is 10° or less, the change caused by raking the ball from the ball rolling passage to the ball circulation passage.

REFERENCES:
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patent: 5988007 (1999-11-01), Nishimura
patent: 6282971 (2001-09-01), Shirai et al.
patent: 6450055 (2002-09-01), Sekiya et al.
patent: 26 27 025 (1977-12-01), None
patent: 199 25 040 (1999-12-01), None
patent: 100 52 204 (2001-07-01), None
patent: 2000-118359 (2000-01-01), None

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