Brake master cylinder with curved lands
US10518759B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 2017 |
| Grant date | Dec 31, 2019 |
| Priority date | — |
| Expiry date | Feb 16, 2038 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16J1/02
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A brake master cylinder comprising a housing having an inner surface defining a bore, and a piston movable in the bore along a piston axis. The piston includes two spaced apart lands defining the radially outermost surfaces capable of contacting the inner surface. At least one of the lands is longitudinally curved at the radially outermost surface. For example, the land can be curved at a radius of less than 1 inch (e.g., between 0.15 inch and 0/75 inch) and preferably less than 0.5 inch. In one embodiment, the longitudinally curved land includes two edges that define an axial length of the land. The two edges have a radius of less than 0.2 inch, and preferably about 0.1 inch. The relative position of the edges and lands is such that neither of the two edges is capable of contacting the inner surface of the bore during reciprocating movement of the piston in the bore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.