Oil bath encoder seal
US7455459B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 2006 |
| Grant date | Nov 25, 2008 |
| Priority date | — |
| Expiry date | Dec 15, 2026 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2326/02
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An oil lubricated rotating hub (14) and stationary spindle (12) assembly includes an oil bath seal (16, 16′) for establishing a dynamic sealing interface between the hub (14) and spindle (12). A wheel sensor assembly includes a variable reluctance senor (54) targeted at an encoder ring (56, 56′) which is integrated into the oil bath seal (16, 16′). The encoder ring (56, 56′) is of the permanent magnet type including a plurality of magnetically polarized sectors alternating between North and South polarities. The use of an encoder style target (56, 56′) in combination with a variable reluctance sensor (54) enables improved slow speed sensing with relatively large air gap spacing between the exposed (58, 58′) of the encoder ring (56, 56′) and the head of the VR sensor (54). Furthermore, the encoder ring (56, 56′) enables use of less expensive, lighter materials for the oil bath seal carrier (20, 20′).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.