Cylinder device
OwnerAtsuo Kohmurainventor
Life of this patent
Estimating the term…
Abstract
A cylinder device is capable of heightening the feed accuracy of a screw shaft and stably controlling the feed speed of a conveying unit in a wide speed range. A ball screw shaft is inserted through a hollow shaft motor having an end fixed to a housing, and a decelerator that is a planetary reduction gear unit connected to the hollow shaft motor. Each of a pair of ball screw nuts, which are disposed to face each other and between which the hollow shaft motor and the decelerator are placed, meshes with the ball screw shaft. An internal gear is connected to a spacer disposed at an end of an output gear of the decelerator. An external gear connected to the ball screw nut meshes with the internal gear. The output gear of the decelerator meshes with a connection shaft by splines.
Claims4
A cylinder device comprising:
- a hollow shaft motor through which a screw shaft is inserted;
- a decelerator connected to an output shaft of the hollow shaft motor;
- a first screw nut that meshes with the screw shaft and that is connected to the decelerator so that a rotational driving force of the hollow shaft motor can be transmitted;
- a second screw nut that meshes with the screw shaft and that is disposed to face the first screw nut with the hollow shaft motor placed between the first screw nut and the second screw nut so that a rotational driving force of the hollow shaft motor can be transmitted;
- an internal gear connected to the decelerator;
- and
- an external gear that meshes with the internal gear and that is connected to the first screw nut,
- wherein a rotational driving force of the hollow shaft motor is transmitted to the first screw nut through the external gear and the internal gear.
A cylinder device comprising:
- a hollow shaft motor through which a screw shaft is inserted;
- a decelerator connected to an output shaft of the hollow shaft motor;
- a first screw nut that meshes with the screw shaft and that is connected to the decelerator so that a rotational driving force of the hollow shaft motor can be transmitted;
- a second screw nut that meshes with the screw shaft and that is disposed to face the first screw nut with the hollow shaft motor placed between the first screw nut and the second screw nut so that a rotational driving force of the hollow shaft motor can be transmitted;
- and
- a connection shaft that is interposed between either first screw nut or the second screw nut and the decelerator and that meshes with an output gear of the decelerator,
- wherein a rotational driving force of the hollow shaft motor is transmitted to either first screw nut or the second screw nut through the connection shaft.
Dependencies are inferred from the claim text.