| 摘要 |
PURPOSE: A spring is provided to reduce hysteresis of a spring by obtaining the same load on compression and restoration corresponding to the same external force. CONSTITUTION: A spring(31) is provided for precise position control of a main control valve applied by a repetitive load from an excavator, a loader and a dump truck. To reduce hysteresis through the same load on compression and restoration corresponding to the same external force, both grinding ends(34a,34b) are closely adhered to each adjacent coil(33a,33b) to a regular length.
|
