TRUCK WITH FRONT AND REAR DRIVE AXLES Russian patent published in 2013 - IPC B60K17/346 

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, particularly, to transfer boxes with automatic torque redistribution. Truck comprises body mounted on the frame, transmission and power takeoff gear with master differential. Said master differential comprises three planetary gear sets switched by toothed coupling 27. Coupling 17 is driven by piston 28 arranged in three-section working chamber 29. Larger-diameter piston 30 making the thrust for piston 28 is arranged together with piston 28. Working chamber front section located ahead of piston 28 and medium section located between pistons are communicated via hydraulic lines with two-position hydraulic control valve 33. Rear section is communicated via hydraulic line and valve 36 with working chamber front section. Hydraulic control valve and aforesaid valve are controlled by electromagnets 37, 38 connected to twin step switch 30 incorporating moving contact arranged at rotary dog 40 driven from truck rear axle beam 51, and two fixed contacts 41, 42. Said contacts 41, 42 are composed of circular different-length coaxial sectors. Hydraulic control valve electromagnet 37 is connected to greater-length contact 41. Valve electromagnet 38 is connected to smaller-length contact 42.

EFFECT: higher efficiency.

2 cl, 4 dwg