Patent ID: 7017703
Filing Date: 2006-03-28
Classification: B60K,F16D,F16H,Y10T

Abstract:
1. A traction control valve system for use with a hydrostatic circuit fluidly connecting a pump and four motors in a closed loop parallel/series arrangement, where left front and right front motors are connected in parallel with an outlet of the pump, left rear and right rear motors are connected in parallel with an inlet of the pump, the left front motor is connected in series with the right rear motor, and the right front motor is connected in series with the left rear motor, comprising: first and second oppositely flowing one-way relief valve lines adapted to connect to the hydrostatic circuit; and wherein below a threshold pressure the first relief valve line is closed so that the traction control valve system passes fluid from the left front motor to the inlet side of the right rear motor; wherein below the threshold pressure the second relief valve line is closed so that the traction control valve system passes fluid from the right front motor to the inlet side of the left rear motor; wherein above the threshold pressure the first relief valve line is open so that the traction control valve system passes fluid from the right rear motor inlet side to the left rear motor; and wherein above the threshold pressure the second relief valve line is open so that the traction control valve system passes fluid from the left rear motor inlet side to the right rear motor inlet side.