| 摘要 |
<p>PURPOSE:To compatibly obtain strength and performance by combining a bulb- shaped lap advantageous for the strength with a wedge-shaped lap advantageous for the performance. CONSTITUTION:A pressure of gas acts on a lap wall, generating force tending to curve a lap. Large moment is generated in the root of the lap decreasing the moment in accordance with its position toward the point end. The large moment is generated especially in the root of lap winding start parts 4C, 5C. Since a shape of the lap is formed thicker in the root of the winding start parts 4C, 5C and thinner as the position of the lap lap changes to its point end, the root improves its strength, and the point end part enables wide space to be generated in the inside when a fixed scroll 4 and a turn scroll 5 are combined. This space serves for a gas passage in a delivery stroke, and the passage, providing a large area with small fluid resistance, enables a loss to be reduced.</p> |
