| 摘要 |
A fluid reaction device for generating a lead-lag function to stabilize a fluid servoloop, which device employs two different area spools or pistons mounted on a single spindle or rod with suitable biasing. A small piston is mounted in a corresponding cylinder and has a rigidly carrying rod drivingly connected to a mechanical control linkage. The rod is freely surrounded by an annular larger piston carried within a correspondingly larger cylinder adjacent the smaller cylinder. A first expansible chamber is thus formed on the side of the larger piston opposite from the smaller piston and a second expansible chamber is formed between the pistons. Variable pressure feed-back fluid is fed into the first expansible chamber and discharged from an outlet port, which may be partially blocked by the larger piston so that fluctuations in the incoming fluid pressure will produce corresponding axial movement fluctuations of the larger piston, which in turn will produce corresponding axial fluctuations in the movement of the smaller piston in a ratio of their areas due to the driving effect of the fluid within the second substantially closed expansible chamber. Bleed passages are provided from the second expansible chamber in the pistons for reducing the ratio of movement between the pistons for low frequency fluctuations of the inlet pressure, as compared to a higher ratio of movement for high frequency fluctuations. Particularly, the device is well suited for use as a feed-back control in the throttle linkage of an internal combustion engine wherein the fluid fed to the first expansible chamber fluctuates in flow in correspondence with engine speed.
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