| 摘要 |
A linkage assembly (10) of remotely adjustable length extends between a steerable member (17) and a frame member (12) to define the center position of the steerable member (17). The linkage assembly includes a resistance assembly (30) for providing a resistance force resisting forces tending to move the steerable member (17) to either side of the center position, and a trim assembly (28) having a piston (36) that may be locked in position (C1) in a trim cylinder (33) for transmitting steering forces to the resistance assembly (30). A trim valve (52, 52', 52,'' 301) is operable between a closed position for preventing trim fluid flow so that the piston (36) is held in its locked position (C1), and an open position for allowing the trim piston (36) to move away from its prior locked position (C1) to a new locked position (C2) to permit the length of the linkage (10) to be changed in response to a steering force applied to the steering wheel. A liquid pressurized by a gas from a gas pressure source (88) is provided to the resistance assembly (30) and to the trim assembly (28) by a single joint accumulator assembly (275) or by a dual accumulator assembly (75, 175). The dual accumulator assembly (75, 175) provides liquid at two different pressures, one for the resistance assembly (30) and the other for the trim assembly (28).
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