A trailer hydraulic braking system comprises a plurality of hydraulic actuators 10, 11, 12, 13 and a main hydraulic fluid conduit 16 connectable to a towing vehicle for actuation of the brakes. Distribution valves 14 distribute the fluid and braking effect to the trailer brakes. Load sensing valve (LSV) 15, connected to a load sensing mechanism of the trailer, modulates the hydraulic braking pressure. An anti-lock braking system (ABS) 20-24 is provided capable of reducing braking pressure to prevent wheel locking. In order to prevent wheel locking when ABS cannot operate (e.g. because no connection possible to tractor electrical system), a normally closed valve 30 is provided, e.g. between distribution valves 14 and LSV 15, along with a by-pass conduit 32 with a restriction valve 34, preferably a pressure limiting or pressure apportioning valve. Therefore, whenever there is no power supply to ABS, hydraulic flow is restricted via valve 34, reducing braking pressure; when there is power to the ABS the valve 30 opens.
Trailer-mounted hydraulic braking system
2015-05-13
Patent
Elektronische Ressource
Englisch
IPC: | B60T Bremsanlagen für Fahrzeuge oder Teile davon , VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF |
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