US 2014/0083224 A1Published application

External circulation type ball screw device

AssigneeHiwin Technologies Corp.

InventorsMing-Yao LIN, PO-CHUAN HAU, Yan-Yu CHEN

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Abstract

The invention provides an external circulation type ball screw device comprising screw shaft and nut having first and second screw grooves. A circulation member comprises first leg, second leg and connection portion. The first leg comprises a first end surface having first inner and outer points, and the second leg comprises a second end surface having second inner and outer points; first and second entrances formed on the first and second end surfaces of circulation passage; first and second thickness respectively provided between the first entrance and the first inner and outer points thereof; the second thickness being greater than the first; the third and fourth thickness respectively provided between the second entrance and the second inner and outer points thereof; the fourth thickness being greater than the third. The groove wall of the second screw groove occupied and the occurrence of broken teeth of the nut are reduced.

Claims9

Dependent claims

An external circulation type ball screw device, comprising:

a screw shaft, having an outer periphery provided with a first screw groove;
a nut, having a through-hole and an inner periphery thereof provided with a second screw groove opposing said first screw groove of said screw shaft;
a circulation member, having a first leg and a second leg provided on two ends thereof respectively and a connection portion connecting said first leg and second leg, said first leg comprising a first end surface having a first inner point and a first outer point, said second leg comprising a second end surface having a second inner point and a second outer point, a circulating passage provided at an internal of said circulation member, said circulating passage penetrating said first leg, said connection portion and said second leg, a first entrance and a second entrance formed on said first end surface and said second end surface respectively and connected to said second screw groove, a first thickness provided between said first entrance and said first inner point, a second thickness provided between said first entrance and said first outer point, said second thickness being triple or more than said first thickness, a third thickness provided between said second entrance and said second inner point, a fourth thickness provided between said second entrance and said second outer point, said fourth thickness being triple or more than said third thickness, said first leg and said second leg penetrating said nut, said first leg having a first tongue protruding outward to said first screw groove, said second leg having a second tongue protruding outward to said first screw groove;
and
a plurality of rolling members, restricted to a rolling path form between said first screw groove and said second screw groove or confined to move within said circulating passage.

2 more elements

An external circulation type ball screw device, comprising:

a screw shaft, having an outer periphery provided with a first screw groove;
a nut, having a through-hole and an inner periphery thereof provided with a second screw groove opposing said first screw groove of said screw shaft;
a circulation member, having a first leg and a second leg provided on two ends thereof respectively and a connection portion connecting said first leg and second leg, said first leg comprising a first end surface having a first inner point, said second leg comprising a second end surface having a second inner point, a circulating passage provided at an internal of said circulation member, said circulating passage penetrating said first leg, said connection portion and said second leg, a first entrance and a second entrance formed on said first end surface and said second end surface respectively and connected to said second screw groove, said first entrance passes through said first inner point, said second entrance passes through said second inner point, said first leg and said second leg penetrating said nut, said first leg having a first tongue protruding outward to said first screw groove, said second leg having a second tongue protruding outward to said first screw groove;
and
a plurality of rolling members, restricted to a rolling path form between said first screw groove and said second screw groove or confined to move within said circulating passage.

2 more elements

An external circulation type ball screw device, comprising:

a screw shaft, having an outer periphery provided with a first screw groove;
a nut, having a through-hole and an inner periphery thereof provided with a second screw groove opposing said first screw groove of said screw shaft;
a circulation member, having a first leg and a second leg provided on two ends thereof respectively and a connection portion connecting said first leg and second leg, said first leg comprising a first end surface, said second leg comprising a second end surface, a circulating passage provided at an internal of said circulation member, said circulating passage penetrating said first leg, said connection portion and said second leg, a first entrance and a second entrance formed on said first end surface and said second end surface respectively and connected to said second screw groove, a first opening connecting said first entrance and an inner side of said first leg, a second opening connecting said second entrance and an inner side of said second leg, said first leg and said second leg penetrating said nut, said first leg having a first tongue protruding outward to said first screw groove, said second leg having a second tongue protruding outward to said first screw groove;
and
a plurality of rolling members, restricted to a rolling path form between said first screw groove and said second screw groove or confined to move within said circulating passage.

2 more elements

Dependencies are inferred from the claim text.