초록 ▼

A spring-loaded parking-brake and service-brake system for trailers of motor-vehicle combinations is provided which increases safety. The system does this by allowing the service brake of the trailer to respond at the same time as the service brake of the towing motor vehicle, and the spring-loaded

A spring-loaded parking-brake and service-brake system for trailers of motor-vehicle combinations is provided which increases safety. The system does this by allowing the service brake of the trailer to respond at the same time as the service brake of the towing motor vehicle, and the spring-loaded parking brake of the trailer to respond at the same time as the parking brake of the motor vehicle. To guarantee safe parking and maneuvering of the uncoupled trailer, the control system of the spring-loaded trailer parking brake is electrical, and furthermore the service brake is also controlled by an additional electrical signal. For this purpose two electrical coupling parts, a pneumatic control-line coupling and a pneumatic supply coupling are attached to the trailer.

대표청구항 ▼

A parking brake and service brake system for a motor vehicle and a trailer towed by said motor vehicle, comprising: a service brake in said motor vehicle; a service brake and a spring-loaded parking brake in said trailer; said service brakes being actuable in response to an electrical service brake

A parking brake and service brake system for a motor vehicle and a trailer towed by said motor vehicle, comprising: a service brake in said motor vehicle; a service brake and a spring-loaded parking brake in said trailer; said service brakes being actuable in response to an electrical service brake signal, and said parking brake being actuable in response to an electrical parking brake signal; pressure-medium supply means for supplying a pressure-medium; fluidic supply coupling means for providing a first fluid coupling of said motor vehicle and said trailer; fluidic control-line coupling means for providing a second fluid coupling through wnich a first fluidic control signal from said vehicle to said trailer is supplied; trailer control valve means for supplying a controlled amount of said pressure medium to said trailer service brake in response to said first fluidic control signal, said trailer control valve means being fluidly connected to said control-line coupling means and said trailer service brake; first electrical trailer coupling means or transmitting said service brake signals between said vehicle and said trailer; pilot valve means for supplying a second fluidic control signal to said trailer control valve means in response to said service brake signals from said first electrical coupling means, said pilot valve means being fluidly connected to said trailer control valve means and electrically connected to said first electrical coupling means; a parking brake in said motor vehicle; second electrical trailer coupling means for transmitting said parking brake signals between said vehicle and said trailer; trailer parking brake valve means for supplying said pressure medium to said trailer parking brake in response to said parking brake signals from said second electrical coupling means, said trailer parking brake valve means being fluidly connected to said trailer parking brake, and electrically connected to said second electrical trailer coupling means; storage vessel means attached to said trailer and fluidly connected to said fluidic supply coupling means and said trailer parking brake valve means for supplying said pressure medium to said trailer parking brake and said trailer service brake; means for generating said electrical signals transmitted by said second electrical trailer coupling means when at least one of said parking brake of said motor vehicle is actuated and a radom electrical signal is generated; and means for generating said fluidic control signal when said service brake of said vehicle is actuated; wherein said pressure-medium is air.