Feed screw mechanism provided with vibration damping means
AssigneeNsk Ltd.
InventorAkihiko Ishikawa
Life of this patent
Estimating the term…
Abstract
A feed screw mechanism includes a cantilever type feed screw shaft having a support end rotatably supported on a base, and a nut screwed on the feed screw shaft and secured to a moving member guidingly movable relative to the base. According to one feature of the present invention, a vibration damping mechanism includes a ring member mounted on the free end part of the feed screw shaft, and a recessed portion such as groove is formed on the inner circumferential surface of the ring member and/or the outer circumferential surface of the feed screw shaft. According to another feature of the present invention, a disk-like flange portion is provided at the free end part of the feed screw shaft as a part of the vibration damping mechanism for the feed screw mechanism.
Claims7
A feed screw mechanism comprising:
- a cantilever free-end type feed screw shaft having a support end rotatably supported on a base;
- a nut screwed on the feed screw shaft and secured to a moving member guidingly movable relative to the base;
- a vibration damping member loosely fitted on a mounting portion provided at the free end of said feed screw shaft;
- and
- means for allowing lubricating oil which penetrates into a space formed by said vibration damping member and said free end of said feed screw to escape from said space,
- said means including a recessed portion formed on an inner circumferential surface of said vibration damping member.
A feed screw mechanism comprising:
- a cantilever free-end type feed screw shaft having a support end rotatably supported on a base;
- a nut screwed on the feed screw shaft and secured to a moving member guidingly movable relative to the base;
- a vibration damping member loosely fitted on a mounting portion provided at the free end of said feed screw shaft;
- and
- means for allowing lubricating oil which penetrates into a space formed by said vibration damping member and said free end of said feed screw to escape from said space,
- said means including a recessed portion formed on an outer circumferential surface of said free end of said feed screw shaft.
A feed screw mechanism comprising:
- a cantilever free-end type feed screw shaft having a support end rotatably supported on a base;
- a nut screwed on the feed screw shaft and secured to a moving member guidingly movable relative to the base;
- a vibration damping member loosely fitted on a mounting portion provided at the free end of said feed screw shaft;
- and
- means for preventing lubricating oil from penetrating from outside into a space between said vibration damping member and said free end of said feed screw shaft.
Dependencies are inferred from the claim text.