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A front wheel drive speed control system for a vehicle having a main rear wheel drive and an assisting hydraulically powered front wheel drive. A hydraulic pump is connected by a hydraulic circuit to a hydraulic motor at each driven front wheel. A clutch assembly between the hydraulic motor and the

A front wheel drive speed control system for a vehicle having a main rear wheel drive and an assisting hydraulically powered front wheel drive. A hydraulic pump is connected by a hydraulic circuit to a hydraulic motor at each driven front wheel. A clutch assembly between the hydraulic motor and the associated wheel facilitates rotation of the driven front wheel. A speed sensing device is mounted to sense speed of the main rear wheel drive and each driven front wheel. A speed control system is connected to the speed sensing devices and to the hydraulic pump and is operable to terminate the pumps operation when the speed of the main rear wheel drive exceeds a predetermined speed and to resume assisting operation of the driven front wheel when the speed of the main rear wheel drive drops below a second predetermined speed.

대표청구항 ▼

A front wheel drive speed control system for a vehicle having a rear wheel drive and an assisting front wheel drive, coprising: (a) a hydraulic pump means operably connected by a hydraulic circuit to a hydraulic motor at each driven front wheel to cause rotation of that wheel; (b) an overrunning clu

A front wheel drive speed control system for a vehicle having a rear wheel drive and an assisting front wheel drive, coprising: (a) a hydraulic pump means operably connected by a hydraulic circuit to a hydraulic motor at each driven front wheel to cause rotation of that wheel; (b) an overrunning clutch assembly interposed between said motor and each associated wheel, engagable to facilitate rotation of said driven front wheel in both forward and reverse directions; (c) a speed sensing means has main rear wheel drive sensor mounted with a vehicle transmission output to the driven rear wheels thereof operable to provide pulse signals indicative of the speed of rotation of said driven rear wheels; (d) a driven front wheel sensor mounted with said vehicle and operable to provide pulse signals indicative of the speed of rotation of said driven front wheel; (e) a comparator means operable to compare the rate of rear wheel pulse signals with a first predetermined rate to produce a front wheel enabling signal when said rear wheel pulse signals are below said first predetermined rate; (f) a front wheel drive operating circuit means connected to said comparator means to receive said front wheel enabling signal and operable to activate said hydraulic pump means to cause rotation of said front wheel; (g) said comparator means additionally has means to compare the rate of said front wheel pulse signals with a second predetermined rate to produce a front wheel disabling signal when said rear wheel pulse signal rate has increased above said first predetermined rate and is decreasing therefrom towards said second predetermined rate; and (h) said front wheel drive operating circuit means being connected to receive said front wheel disabling pulse signal and operable to maintain said hydraulic pump means in a deactivated condition until said rear wheel pulse signals are equal to said second predetermined rate whereupon said hydraulic pump means is activated to resume assisting rotation of said front wheel.