| 摘要 |
An oil seal test unit tests for leakage of oil seals in a rack and pinion steering unit having (a) a pinion housing with a main supply pressure inlet and outlet, and left and right turn fluid pressure connections; (b) a rack housing with left turn and a right turn fluid pressure fittings; and (c) right and left tie rod ends. The test unit includes a pump for supplying hydraulic fluid under pressure through a main supply line connected to the inlet of the pinion housing. A return line connected to an outlet from the pinion housing returns fluid to the pump reservoir. Steering pressure is simulated by a reciprocating bar secured to the tie rod ends of the steering unit. A hydraulic cylinder has a piston with an actuating rod connected to the reciprocating bar. Right or left turning movement of the steering unit moves the tie rods which, in turn, applies pressure against hydraulic fluid in the cylinder. A valve in the hydraulic line connected to the cylinder can be metered down to increase simulated steering resistance. A steering pressure divider is substituted for either the right turn or left turn pressure lines of the steering unit. The divider includes a first line for connection to the right or left turn fluid pressure connection of the pinion housing, a second line for connection to the right or left turn fluid pressure fitting of the rack housing, a valve for controlling flow from the first to the second line, and a gauge for indicating the pressure of fluid flowing from the first to the second line. The seals in the pinion housing can be tested for leakage against the simulated steering pressure; and separately, the seals in the rack housing can be tested for leakage against the simulated steering pressure. A difference in readings on the main pressure gauge and the divider gauge indicates oil leakage.
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