| 摘要 |
<p>PURPOSE:To enhance mounting performance onto a vehicle and the like by eliminating useless spaces as much as possible in any area from an inner wall at the trailing end of a stationary spiral body to the inner wall of a shell, and thereby furthermore making the minimum inner diameter smaller. CONSTITUTION:The center O of the inner diameter of a shell 22 is displaced from the center point S0 of a base circle S to the direction reverse to the trailing end 23a of a stationary spiral body 23 by a distance which is equal to or more than Ror/2, but less than Ror/2+(t+c)/2.</p> |
