Hydraulic apparatus for driving one or more hydraulic equipment devices, mounted on a semi-trailer, by means of the system motorizing the semi-trailer
OwnerJean-Claude Fouquetinventor
Life of this patent
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Abstract
A hydraulic apparatus drives a semi-trailer hitched to a road tractor and a hydraulic equipment device carried by the semi-trailer. The apparatus includes an auxiliary motor capable of driving the device, for example a concrete mixer, through a hydraulic circuit when the vehicle is traveling along the ground, and an electric circuit for controlling valves which, when the vehicle is stationary, put in communication the circuit and a hydrostatic circuit which drives the concrete mixer. The hydrostatic circuit motorizing the semi-trailer is used for alternately driving either the axles of the semi-trailer or the equipment device to be driven.
Claims4
In a hydraulic apparatus for driving at least one device mounted on a semi-trailer which has an axle and which is hitched to a tractor having an engine provided with a gear box and a power take-off, said hydraulic apparatus being of the type comprising a hydrostatic system providing mechanical transmission between said take-off and said axle of said semi-trailer when the tractor is moving, said hydrostatic system comprising a variable hydraulic pump connected to said take-off and a hydraulic motor supplied with fluid by said pump and drivingly connected to said axle, and a hydraulic circuit for driving said device and including an auxiliary motor operated by an auxiliary pump, the improvement comprising:
- control means, operatively connected to said hydrostatic system and to said hydraulic circuit, for, when the tractor is moving, causing said device to be driven solely by said hydraulic circuit while said axle is driven by said hydrostatic system, and for, when the tractor is stationary, causing said device to be driven solely by said hydrostatic system.
Dependencies are inferred from the claim text.