Work machine with spring loaded brake and prestressed spring device providing idle travel

A work machine, such as a truck, has a spring loaded brake 2, e.g. a parking brake, which is engaged by a spring 5a, 5b and released when connected via a hydraulic circuit to a pump 15. When a service brake input device, e.g. pedal 25, is pushed downwards it operates a pressure reducing valve 8a whi...

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Bibliographische Detailangaben
Hauptverfasser:	ANDREAS HOELSCHER, FRANZ HUBER, BERNWARD WELSCHOF, MARCUS DOELGER
Format:	Patent
Sprache:	eng
Schlagworte:	ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL PERFORMING OPERATIONS PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OFVEHICLES TRANSPORTING VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES VEHICLES IN GENERAL
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Beschreibung
Zusammenfassung:	A work machine, such as a truck, has a spring loaded brake 2, e.g. a parking brake, which is engaged by a spring 5a, 5b and released when connected via a hydraulic circuit to a pump 15. When a service brake input device, e.g. pedal 25, is pushed downwards it operates a pressure reducing valve 8a which reduces the pressure in line 7 thereby allowing the brake 2 to be engaged. A prestressed spring device 26 is connected between the pedal 25 and the valve 8a so as the pedal 25 is activated in a direction of a reduction in brake release pressure a short idle travel of the pedal 25 is achieved. This idle travel last up to a point when a braking torque of the spring loaded brake 2 is built up and a long actuation travel of the pedal 25 can be made available thereby reducing the pressure in the brake 2 in a controlled manner so that the brake 2 is used as a meterable service brake.