A shaft member 21 is arranged across the bore at a height corresponding to the maximum enlarged part of a choke bore 11 and the approximately center of the venturi bore 12. チョークボア11の最大拡張部、かつベンチュリボア12の略中央に対応する高さにボアを横切ってシャフト部材21を設ける。 - 特許庁
When the slide valve 14 is opened, the acceleration of a flow in the choke bore 11 is momentarily delayed by the shaft member 21, and negative pressure in the venturi bore 12 is increased. 摺動弁14の開弁時、シャフト部材21がチョークボア11内の流れの加速を一瞬遅らせ、ベンチュリボア12内の負圧を増大させる。 - 特許庁