Seal for ball screw and ball screw installing the same
AssigneeNsk Ltd.
InventorHiromichi Nakagawa
Life of this patent
Estimating the term…
Abstract
A projection 5 is formed in ring shape at a side facing outside of a circular arc face 3 at the front end portion of a sealing lip L, the projection being to contact a frank face in a progressing side of the screw shaft. If the seal for ball screw is attached to the nut end portion, rigidity effecting along the lip thickness is reinforced by the projection 5, to subsequently prevent turnover easily happening hitherto in a steeply oblique part of the frank face of a progressing side. At this steeply oblique part, a double sealing function is exhibited by contacting the circular arc face 3 at the front end portion of the sealing lip L and the projection 5 at the side facing outside to this part.
Claims19
A seal for ball screw, said seal comprising:
- a sealing main body attached to a nut end portion of the ball screw;
- a sealing lip inwardly protruding from said sealing main body and extending substantially along a cross sectional shape of a ball screw shaft of the ball screw, said sealing lip further comprising an end portion;
- and
- an annular-shaped projection disposed proximate said end portion of the sealing lip.
A ball screw comprising:
- a ball screw shaft;
- a ball screw nut movable along said ball screw shaft;
- and
- a seal attached to an end portion of said ball screw nut,
- wherein said seal comprises
- a sealing main body attached to a nut end portion of the ball screw,
- a sealing lip inwardly protruding from said sealing main body and extending substantially along a cross sectional shape of a ball screw shaft of the ball screw, said sealing lip further comprising an end portion;
- and
- an annular-shaped projection disposed proximate said end portion of the sealing lip.
A seal for ball screw, said seal comprising:
- a sealing main body attached to a nut end portion of the ball screw;
- a sealing lip inwardly protruding from said sealing main body and extending substantially along a cross sectional shape of a ball screw shaft of the ball screw, wherein said sealing lip further comprising an end portion;
- and
- means for increasing rigidity of the sealing lip, and said means for increasing rigidity is disposed proximate said end portion of the sealing lip so as to resist turning over of the lip.
Dependencies are inferred from the claim text.