| 摘要 |
PCT No. PCT/JP88/00227 Sec. 371 Date Oct. 13, 1988 Sec. 102(e) Date Oct. 13, 1988 PCT Filed Mar. 1, 1988 PCT Pub. No. WO88/06682 PCT Pub. Date Sep. 7, 1988.A cup-shaped spring holder having a flange on the outer periphery on the open end side is secured on the end portion of a valve shaft which protrudes outwardly from a carburetor barrel, with a clearance for coil insertion provided between the barrel and the open-end side. An outer torsion coil spring is fitted in the aforementioned spring holder to restrain an axial shift of the spring. And one end of an inner torsion coil spring fitted on the aforementioned shaft end portion is led out through the aforementioned clearance and retained by a spring retainer on the aforesaid barrel. Because of the above-described constitution, this invention features simple construction, easy manufacture, increased mechanical strength, a less number of components parts required, easy assembly, and improved valve shaft strength.
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