Hydraulic control valve circuit for a swing mechanism

B - Operations – Transporting – 66 – F

Patent

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Details

214/24, 138/72.1

B66F 9/22 (2006.01) E02F 3/38 (2006.01) E02F 3/42 (2006.01) F15B 15/06 (2006.01)

Patent

CA 1166550

Abstract of the Disclosure A unique hydraulic circuit is provided for converting rectilinear motion to rotational motion about an axis through the use of two pivotally mounted hydraulic motors. The hydraulic motors are pivotally interconnected between a pivoting member and a fixed member. A source of hydraulic fluid under pressure is directed to each hydraulic motor by a conduit system incorporating a flow control valve and a sequencing valve. The flow control valve selectively delivers fluid power to the hydraulic motors to rotate the pivoting member in one direction or the other. The sequencing valve senses the angular position of the two hydraulic motors and redirects the flow of fluid to the hydraulic motors in such a manner as to maintain the torque applied to the pivoting member relatively constant. The sequencing valve acts to redirect the flow of hydraulic fluid to the hydraulic motors so that only one of the hydraulic motors is pressurized at the end of the arc of swing of the pivoting member. The other hydraulic motor, at the beginning of the arc of swing of the pivoting member, has pressure applied to both sides of its piston by the sequencing valve. Both hydraulic motors are pressurized by the sequencing valve to develop their maximum output force when those hydraulic motors are between their overcenter positions.

380093

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