FESTO气缸根据工作所需力的大小来确定活塞杆上的推力和拉力。由此来选择气缸时应使气缸的输出力稍有余量。若缸径选小了，输出力不够，气缸不能正常工作；但缸径过大，不仅使设备笨重、成本高，同时耗气量增大，造成能源浪费。在夹具设计时，应尽量采用增力机构，以减少气缸的尺寸。 气缸 下面是气缸理论出力的计算公式： F：气缸理论输出力（kgf） F′：效率为85%时的输出力（kgf）－－（F′=F×85%） D：气缸缸径（mm） P：工作压力（kgf/cm2） 例：直径340mm的气缸，工作压力为3kgf/cm2时，其理论输出力为多少?芽输出力是多少? 将P、D连接，找出F、F′上的点，得： F=2800kgf；F′=2300kgf 在工程设计时选择气缸缸径，可根据其使用压力和理论推力或拉力的大小，从经验表1－1中查出。 例：有一气缸其使用压力为5kgf/cm2，在气缸推出时其推力为132kgf，（气缸效率为85%）问：该选择多大的气缸缸径?

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