| 摘要 |
PURPOSE:To make clutch operation to be performed easily by reducing energizing force transmitted to the second valve body through treading down operation on a clutch pedal for reducing pneumatic pressure toward a pneumatic clutch successively. CONSTITUTION:The first spring 86, the second spring 89 and the third spring 88, whose spring constants are set in such wise that they get weaker by turns, are made to be changed over in accordance to treading down stroke of a clutch pedal 69. While,the maximam pneumatic pressure is lowered through lowering the spring load of the first spring 86. Therefore, in the stroke of the clutch pedal 69, the device exhibits linearly increasing character of leg-power according to increase of stroke. Therefore, a driver can have natural clutch operation feeling of leg-power becoming heavier in proportion as treading down stroke on the clutch pedal 69 increases, so clutch operation becomes easy.
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