Steering circuit system for a moving vehicle
First Claim
1. A steering circuit system for a moving vehicle, comprising:
- a first hydraulic line;
a second hydraulic line;
a hydraulic pump having a discharge line;
a first steering cylinder having a first expanding chamber and a first contracting chamber;
a manual operation steering valve connected to the discharge line of the hydraulic pump and having a first position connecting the discharge line with the first contracting chamber by way of the first line, and a second position connecting the discharge line with the first expanding chamber by way of the second line;
a third hydraulic line;
a switching valve connecting discharge line to the third line;
a fourth line having a first pilot operation check valve therein, and a fifth line having a second pilot operation check valve therein, wherein the first pilot operation check valve is constructed to open in response to oil pressure in the fifth line and the second pilot operation check valve is constructed to open in response to pressure in the fourth line;
an automatic operation steering valve having a first position connecting the third line to the first contracting chamber by way of the fourth line, and having a second position connecting the third line to the first expanding chamber by way of the fifth line.
2 Assignments
0 Petitions
Accused Products
Abstract
A steering circuit system for a moving vehicle in which automatic steering operation as well as manual steering operation can be achieved. Pressurized oil discharged from a hydraulic pump (1) is fed to a steering line (3) and to an auxiliary steering line (10). The pressurized oil of the steering line (3) is fed to an expanding chamber (9a, 90a) and to a contracting chamber (9b, 90b) of a pair of steering cylinders (9, 90) by manual operation steering valve (5). The auxiliary steering line (10) is connected to a third line (12) through a switching valve (11). The third line (12) is connected to a fourth line and to a fifth line (14, 15) through an automatic operation steering valve (13). The fourth line (14) is connected to contracting chamber (9b) and to expanding chamber (90a) of the left and right steering cylinders (9, 90). The fifth line (15) is connected to contracting chamber (90b ) and expanding chamber (9a) of the left and right steering cylinders (9, 90). First and second pilot operation check valves (16, 17) are provided in the fourth and the fifth lines (14, 15), respectively. The first pilot operation check valve is opened in response to pressure in the fifth line (15), and the second pilot operation valve is opened in response to pressure in the fourth line (14).
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Citations
13 Claims
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1. A steering circuit system for a moving vehicle, comprising:
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a first hydraulic line; a second hydraulic line; a hydraulic pump having a discharge line; a first steering cylinder having a first expanding chamber and a first contracting chamber; a manual operation steering valve connected to the discharge line of the hydraulic pump and having a first position connecting the discharge line with the first contracting chamber by way of the first line, and a second position connecting the discharge line with the first expanding chamber by way of the second line; a third hydraulic line; a switching valve connecting discharge line to the third line; a fourth line having a first pilot operation check valve therein, and a fifth line having a second pilot operation check valve therein, wherein the first pilot operation check valve is constructed to open in response to oil pressure in the fifth line and the second pilot operation check valve is constructed to open in response to pressure in the fourth line; an automatic operation steering valve having a first position connecting the third line to the first contracting chamber by way of the fourth line, and having a second position connecting the third line to the first expanding chamber by way of the fifth line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification