Roots pump
US12188474B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 20, 2024 |
| Grant date | Jan 7, 2025 |
| Priority date | — |
| Expiry date | Feb 20, 2044 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C2240/60
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A roots pump comprising: a rotary shaft; a rotor having a hole-forming surface that forms an insertion hole, and a first bearing and a second bearing. Each of the first bearing and the second bearing includes an inner ring and an outer ring. The rotary shaft is press-fitted in the inner ring of the first bearing, and fitted in the inner ring of the second bearing with a clearance between the rotary shaft and the inner ring of the second bearing. An edge portion of the hole-forming surface adjacent to the first bearing serves as a press-fitting portion in which the rotary shaft is press-fitted, and at least an edge portion of the hole-forming surface adjacent to the second bearing serves as a clearance-fitting portion in which the rotary shaft is fitted with a clearance between the rotary shaft and the clearance-fitting portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.