External circulation ball screw
US9897181B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 2017 |
| Grant date | Feb 20, 2018 |
| Priority date | — |
| Expiry date | Mar 15, 2037 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H25/2214
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An external circulation ball screw includes an elongate shaft having has an outer circumferential surface formed with a helical rolling groove; a nut having a through hole formed therein for receiving extension of the elongate shaft therethrough, the through hole having an inner circumferential surface formed with a rolling channel corresponding to the rolling groove, the rolling groove and the rolling channel collectively defining a loading passage, the nut having an outer surface, which includes, formed therein, two through apertures that are spaced from each other and in communication with the through hole and a cavity in communication with the two through apertures; rolling elements arranged in the loading passage and having a diameter between 0.3-1 mm; and a circulator having a U-shape and is arranged in the cavity and the through apertures and formed with a return passage connected to the loading passage to collectively define a circulation channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.