Machine element or mechanism – Gearing – Directly cooperating gears
Reexamination Certificate
2006-02-07
2006-02-07
Joyce, William C. (Department: 3682)
Machine element or mechanism
Gearing
Directly cooperating gears
C074S424820, C074S424860
Reexamination Certificate
active
06993992
ABSTRACT:
A ball screw which is little subject to deterioration of operating characteristics and occurrence of wear, torque change, noise, vibration, etc. during operation due to stagnation or competition of balls. The ball screw includes a screw shaft having a helical thread groove formed on the outer surface thereof and a nut having a thread groove formed on the inner surface thereof corresponding to the thread groove on the screw shaft which engages with the screw shaft with the interposition of a number of balls rollably provided in a helical ball rolling path formed between the two thread grooves, and spacers between adjacent ones of the number of balls, wherein the variation of the total of the gap between the balls and spacers during the rolling of the balls is smaller than 1/20 of the diameter of the ball.
REFERENCES:
patent: 3053105 (1962-09-01), Cole
patent: 6149307 (2000-11-01), Kamimura et al.
patent: 6347558 (2002-02-01), Miyaguchi et al.
patent: 2002/0139209 (2002-10-01), Takagi et al.
patent: 199 25 040 (1999-12-01), None
Kanda Toru
Maruyama Daisuke
Sannomiya Hitoshi
Joyce William C.
NSK Ltd.
Sughrue & Mion, PLLC
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