Apparatus and method for prefilling secondary hydraulic circuits of a vehicular braking system
US5944068A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 13, 1997 |
| Grant date | Aug 31, 1999 |
| Priority date | — |
| Expiry date | Feb 13, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T17/222
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An access port to a secondary circuit of a hydraulic braking system of a vehicle is provided in a hydraulic control unit. A prefilling apparatus for adding brake fluid to the secondary circuit includes a first device for evacuating and filling the secondary circuit with brake fluid. The first device includes a switchable valve connected to the access port, a pump, and a pressurized fluid reservoir. The prefilling apparatus also includes a second device for expelling trapped air from a pump of the hydraulic braking system. The second device includes a piston/cylinder arrangement connected to the access port, a source of pressurized air, and a fluid reservoir connected to the piston/cylinder arrangement. A connection tool and method for prefilling the secondary circuit utilizing this prefilling apparatus are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.