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US 5,337,627 AGranted
Ball screw
AssigneeNissei Plastic Industrial Co., Ltd.
InventorNobuyuki Nakamura
Life of this patent
Estimating the term…
Abstract
A ball screw comprising a screw shaft and a nut into which the screw shaft is screwed through a multiplicity of balls, the screw shaft having thereon a series of alternate threads and grooves changing partly in pitch, a flexible ball receiver provided integrally within the nut for allowing the balls to move axially of the receiver depending on a change in the pitch of threads on the screw shaft, and a ball return guide provided outside or inside the nut for changing the feed speed or torque of the ball screw automatically.
Claims12
A ball screw comprising:
- screw shaft means having thereon a series of alternate threads and grooves which change in pitch over the length of the shaft means;
- a multiplicity of balls received in the grooves on the screw shaft means;
- nut means surrounding the balls in the grooves, and through which the screw shaft means is screwed;
- flexible ball receiver means provided within the nut for allowing the locations of the balls along the nut to move axially along the nut and to move along with the receiver means depending on a change in the pitch of the threads on the screw shaft means which are then surrounded by the nut means;
- and
- return guide means provided outside the nut means and having a portion extending through the nut means for returning the balls therethrough to the grooves on the screw shaft means.
3 more elements
A ball screw comprising:
- screw shaft means having thereon a series of alternate threads and grooves which change in pitch over the length of the shaft means;
- a multiplicity of balls received in the grooves on the screw shaft means;
- nut means surrounding the balls in the grooves, and through which the screw shaft means is screwed;
- flexible bal receiver means provided within the nut means for allowing the locations of the balls along the nut to move axially along the nut and to move along with the receiver means depending on a change in the pitch of the threads on said screw shaft means which are then surrounded by the nut means;
- and
- return guide means provided on the side of the ball receiver means toward the nut means, the guide means having a return groove communicating with one of the ball grooves between threads on the screw shaft means.
3 more elements
A ball screw comprising:
- a screw shaft having a series of alternate threads and grooves formed thereon, with the pitch of the threads and the grooves varying over the length of the shaft;
- a nut inside which the screw is disposed and the nut being moveable along the screw;
- a multiplicity of balls received in the respective ones of the grooves which are then surrounded by the nut;
- a flexible ball receiver provided inside the nut and extending around the balls in the grooves in the nut, the ball receiver having an interior side shaped for receiving and supporting the balls in the grooves, the ball receiver being flexible such that as the nut moves along the shaft to surround different pitch grooves, the ball receiver is flexible to move along the nut to adapt its interior side to the change in groove pitch so that it remains around the balls in the grooves then surrounded by the nut;
- and
- return guide means located radially outward of the portion of the ball receiver which receives the balls and being so connected with the ball receiver as to adjust in position along the nut as the ball receiver shifts with the change in the pitch of the grooves;
- the return guide means including a first portion extending to one of the grooves to communicate with the balls in the one groove and a second portion spaced from the first portion and extending to a second one of the grooves to communicate with the balls in the second groove.
4 more elements
Dependencies are inferred from the claim text.