| 摘要 |
PURPOSE: A variable oil-hydraulic pressure line system used for testing a brake system is provided to improve tester's convenience and reduce steeply a testing time and to perform effectively the experiment of a braking ability. CONSTITUTION: A variable oil-hydraulic pressure line system used for testing a brake system includes a first oil-hydraulic pressure line(1) is used to test a braking ability respectively or the braking ability of a front brake by using oil-hydraulic pressure caused by a servomechanism and a master cylinder. A second oil-hydraulic pressure line(2) is installed with a first(31) and a second solenoid valve(32), and a pressure sensor(33), is diverged on the first oil-hydraulic pressure, and examines simultaneously the braking ability of the front brake or a rear brake. A proportioning valve(22) connected to the second oil-hydraulic pressure line reduces a brake hydraulic pressure supplied to the second oil-hydraulic pressure line down to a constant pressure. A third oil-hydraulic pressure line(3) equipped with a third solenoid valve(34) connects the proportioning valve with the rear brake. One end of an auxiliary oil-hydraulic pressure line(35) installed with a fourth solenoid valve(36) is coupled with the first oil-hydraulic pressure line, and other end thereof is connected to the third oil-hydraulic pressure line. A control box compares the pressure of the brake hydraulic pressure input in the proportioning valve with the line pressure detected from the pressure sensor, and regulates an opening and a closing operation of the first, second, third, and fourth solenoid valve. Air is simply deflated by replacing the proportioning valve installed between the second and the third oil-hydraulic pressure line when the hydraulic pressure changes a single type to a dual type.
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