The axial lower section of the hemisphere case is equipped with the absorptioncavity which connects with the segmental concave cavity.
半球壳体轴向下部设有连通圆缺凹腔的吸收腔。
2
Involute profile of internal gear, in the small gear and internal gear intermediate have a crescent shape of the diaphragm, the purpose is the oil absorptioncavity and pressure oil cavity off.
渐开线齿形的内啮合齿轮，在小齿轮和内齿轮中间有一块月牙形状的隔板，目的是把吸油腔和压油腔隔开。
3
By varying the groove spacing, the diameter of the single or double diameter hole, and the rear air cavity depth and content, one can obtain absorption over a wide variety of frequencies.