Master cylinder comprising a valve with reduced pedal free travel
US6978614B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 6, 2002 |
| Grant date | Dec 27, 2005 |
| Priority date | — |
| Expiry date | Sep 6, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T11/236
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
This invention relates to a master cylinder (10), inside a bore (14) of which two axial primary and secondary pistons (16, 18), are slidingly fitted, and in which at least one sealing means (48, 50) is disposed in contact with each piston, defining a supply chamber (56, 60) and a pressure chamber (58, 62). Each piston (16, 18) comprises a bore (78, 80), open in the direction of the front pressure chamber (58, 62), and the piston (18) comprises a valve-forming through-hole (88), opening into its periphery and into its bore (80), in order to isolate the front pressure chamber when it passes beyond the sealing means so as to produce a braking pressure, characterised in that the front pressure chamber (62) associated with at least one piston (18) comprises at least one tubular cylindrical element (90) extending axially outside the piston (18) and rearwards of the sealing means (50) for the obturation of the through-hole (88) according to a reduced stroke (Cm2).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.