| 摘要 |
PROBLEM TO BE SOLVED: To enhance the performance of a screw by arranging so that the difference in the outside diameter between the water suction side and discharge side of the body can be set large. SOLUTION: This screw 11 is fundamentally composed of a body 12 shaped in a funnel form and a plurality of blades 14 formed spirally on the peripheral surface of the body 12. The body 12 is furnished with a first communication hole 18 opening at the forefront of the body (water suction side) and a second communication hole 20 opening at the tail (water discharge side) in such a way as coaxially to generate mutual communications. A spline 16 is machined on the inside surface of the first communication hole 18, in which a spline shaft 32 is inserted and rotated. A sleeve 22 furnished at the inside surface with female threads is fitted in the second communication hole 20 in the body 12, and a supporting shaft is screwed into the sleeve 22, and thereby the screw 11 is mounted on an on-water bike.
|
