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US 5,228,353 AGranted
Ball screw device
AssigneeNsk Ltd.
InventorsMasayuki Katahira, Taiji Honma
Life of this patent
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AssigneeNsk Ltd.
InventorsMasayuki Katahira, Taiji Honma
Estimating the term…
A ball screw device has a ball screw nut and a ball spline nut, both mounted on a shaft. Both the nuts are supported on a housing with ball bearings interposed therebetween. Inner race grooves of the ball bearings are formed on outer peripheral walls of the nuts, while outer race grooves of the ball bearings are formed on an inner peripheral wall of the housing. In another embodiment, ball insertion holes are formed through the nuts so that the ball insertion holes extend from inner peripheral walls of the nuts to the inner race grooves, respectively. The insertion holes are closed by plugs which were fitted in the insertion holes subsequent to the insertion of balls of the ball bearings through the insertion holes. In a further embodiment, a ball screw nut and a ball spline nut, both mounted on a shaft, are supported on a common housing by way of ball bearings, thereby constructing a ball screw device with a closed small space surrounded by the housing, ball screw nut, ball spline nut and shaft. Dust produced inside the ball screw device can be collected in the closed space and discharged directly through a suction hole formed through the housing.
In a ball screw device comprising a shaft provided with a ball screw groove and at least one ball spline groove, a ball screw nut and a ball spline nut mounted on the shaft via balls interposed therebetween, and a housing having an inner peripheral wall on which the ball screw nut and ball spline nut are rotatably supported by the virtue of rotation of balls of ball bearings, the improvement comprising a means for applying a selected pre-load without the use of a spacer, said means comprising inner race grooves of the ball bearings formed in the outer peripheral walls of the ball screw nut and the ball spline nut, respectively;
In a ball screw device comprising a shaft provided with a ball screw groove and at least one ball spline groove, a ball screw nut and a ball spline nut mounted on the shaft via balls interposed therebetween, and a housing having an inner wall on which the ball screw nut and ball spline nut are rotatably supported by the virtue of rotation of balls of ball bearings, the improvement comprising a suction opening is provided through the housing to permit direct evacuation of a closed space surrounded by the housing, ball screw nut, ball spline nut and shaft;
In a ball screw device comprising a shaft provided with a ball screw groove and at least one ball spline groove, a ball screw nut and a ball spline nut mounted on the shaft via balls interposed therebetween, and a housing having an inner wall on which the ball screw nut and ball spline nut are rotatably supported by the virtue of rotation of balls of ball bearings, the improvement comprising outer race grooves of the ball bearings are formed in the inner peripheral wall of the housing;
Dependencies are inferred from the claim text.