| 摘要 |
PURPOSE:To provide possibility of setting the stroke of a poppet to any desired level by installing a coil spring over and under a pilot spool, and by selecting the spring constant of these coil springs to appropriate value. CONSTITUTION:When a pilot spool 44 is displaced up or down by a pulse motor 26, the degree of opening of a poppet 52 is increased or decreased by oil supplying and exhausting action. Here the position of this poppet 52 is decided by No. 1 spring 42 and No. 2 spring 62 in engagement with a movable sleeve 50. Use of a spring with large spring constant to said No. 2 spring 62 should give the poppet 52 a greater stroke. This can lessen the sizes of a solenoid, stepping motor, etc. to constitute a poppet lift control mechanism of the poppet valve. |
