Hydraulic circuit having a rotary type pump and brake apparatus for a vehicle provided with the same
US6474751B1 · kind B1 · utility
18Cited by
36References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 24, 2000 |
| Grant date | Nov 5, 2002 |
| Priority date | — |
| Expiry date | Oct 24, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C2230/92
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
In the brake apparatus having a rotary pump, outer and inner rotors of the rotary pump are made of bearing steel and inner and outer teeth portions of the rotors are respectively processed by nitriding hardening or carbo-nitriding hardening. Accordingly, outer circumferential region of the outer teeth portion and inner circumferential region of the inner teeth are constituted by nitrided layer containing 15 to 40 percents retained austenite so that teeth faces of the outer and inner teeth portions in mesh may have higher wear resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.