F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
138/71
F15B 11/16 (2006.01) B60K 17/10 (2006.01) B60T 1/08 (2006.01) B60T 8/18 (2006.01) B60T 13/58 (2006.01)
Patent
CA 1055359
ABSTRACT OF THE DISCLOSURE A control device for a lift truck. The control device con- sists of a main hydraulic circuit having an adjustable axial- piston pump pivotable in both directions, a hydraulic motor or a plurality of hydraulic motors, a control circuit with a hydraulic pump rotating proportionally with the engine of the vehicle and acting upon the control circuit, and a slide valve controlling the direction of travel. The hydraulic circuit acts upon the mechanism adjusting the axial-piston pump through control valves containing choke devices. The control device includes a further hydraulic circuit acting, through an additional hydraulic pump and control valve, upon a lifting cylinder actuating the loading means. In the case of one known device, the choke adjustment must, of necessity, match the relatively unsatisfactory dynamic travelling stability of the loaded fork-lift truck. In other words, the deflection velocity is determined by constant choke de- vices from the forward travel for braking to the reverse travel for accelerating. As a result, rapid acceleration in forward travel, which is advantageous and desirable, and maximum possible retardation in reverse travel, in relation to dynamic travelling stability - at a corresponding pump-deflection velocity - cannot be achieved. The present invention proposes to overcome these disadvantages by achieving optimal retardation in forward travel and optimal acceleration in reverse travel, without increasing the dimensions of the fork-lift truck, or the weight thereof, in order to ensure adequate dynamic travelling stability. This is achieved in that arranged between the slide valve controlling the direction of travel and the adjusting mechanism are two double choke-valves. One of the double choke-valves is for starting and braking in forward travel. A double choke-valve, used to control starting and braking in reverse travel.
260478
Na
O. And K. Orenstein And Koppel Aktiengesellschaft
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