Ball spline linear motion rolling guide unit
US4799803A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 9, 1988 |
| Grant date | Jan 24, 1989 |
| Priority date | — |
| Expiry date | May 9, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C29/0695
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A ball spline linear motion rolling guide unit comprises: a ball spline shaft on which first track grooves are formed in a longitudinal direction at predetermined positions on an outer peripheral surface; a hollow outer cylinder having a hollow hole into which the ball spline shaft is slidably inserted; second track grooves formed on an inner peripheral surface of the hollow hole so as to face the first track grooves of the ball spline shaft; and balls inserted between the first and second track grooves, wherein the arc center of the second track groove formed on the outer cylinder is slightly deviated to the side of the ball spline shaft from the center of the ball inserted between the first and second track grooves, the entrance portion of the second track groove is formed by an arc surface having a diameter which is slightly larger than the diameter of the ball, thereby constructing a supporting portion of the balls, and an almost V-shaped notched groove is formed in a bottom portion of each of the first and second track grooves, thereby forming a groove having an almost arrowhead-shaped cross section, and the portion near the edge of the arrowhead-shaped groove serves as the tr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.