Jerk control valve for pilot operated steering system
First Claim
1. A jerk control valve adapted for use in a pilot operated steering system having a tank, left steer and right steer pilot lines, and a check valve disposed in each of the pilot lines, the jerk control valve comprising:
- a right steer flow passage communicating the right steer pilot line with the tank;
a left steer flow passage communicating the left steer pilot line with the tank;
first orifice means disposed between the right steer flow passage and the tank;
second orifice means disposed between the left steer flow passage and the tank;
third orifice means disposed in the right steer flow passage;
fourth orifice means disposed in the left steer flow passage;
a pilot operated valve having an open position establishing communication through the first and second orifice means and a closed position blocking communication through the first and second orifice means, the pilot operated valve having a spring biasing the pilot operating valve to the open position; and
a resolver disposed to transmit the highest pilot pressure from the right steer pilot line and the left steer pilot line to the end of the pilot operated valve.
1 Assignment
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Accused Products
Abstract
A jerk control valve adapted for use in a pilot operated steering system has a pilot operated valve biased to an open position by a spring for communicating left steer and right steer pilot lines to a tank through a pair of orifices. The pilot operated valve is moveable to a closed position blocking communication through the first and second orifices when the highest pressure of the left and right steer pilot lines exceeds a predetermined value. The left and right steer pilot lines are continuously communicated with the tank through a pair of orifice devices.
23 Citations
3 Claims
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1. A jerk control valve adapted for use in a pilot operated steering system having a tank, left steer and right steer pilot lines, and a check valve disposed in each of the pilot lines, the jerk control valve comprising:
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a right steer flow passage communicating the right steer pilot line with the tank; a left steer flow passage communicating the left steer pilot line with the tank; first orifice means disposed between the right steer flow passage and the tank; second orifice means disposed between the left steer flow passage and the tank; third orifice means disposed in the right steer flow passage; fourth orifice means disposed in the left steer flow passage; a pilot operated valve having an open position establishing communication through the first and second orifice means and a closed position blocking communication through the first and second orifice means, the pilot operated valve having a spring biasing the pilot operating valve to the open position; and a resolver disposed to transmit the highest pilot pressure from the right steer pilot line and the left steer pilot line to the end of the pilot operated valve. - View Dependent Claims (2, 3)
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Specification