| 摘要 |
PURPOSE:To prolong life by leassening the abrasion of a body of revolution by forming a spiral grooves at fixed intervals in the circumferential direction while keeping a slight gap between the body of revolution and a stable plate corresponding to the reverse surface of the body of revolution. CONSTITUTION:Through the turning of body 1 of revolution, air staying in slight gap 3 has negative dynamic pressure by centrifugal force and position dynamic pressure through the viscous pump effect of spiral groove 12. The negative dynamic pressure can be made less than or equal to the positive dynamic pressure by selecting the number of spiral grooves 12, the formation angle of them and the depth of them, and at land part 13, both pressures are equal. According to pressure distribution in slight gap 3, body 1 of revolution, therefore, has pressure equal to circumferential pressure at the outermost circumference and greater than it at its internal circumference and the greatest pressure at the land part of the innermost circumference. Thus, body 1 of revolution can be prevented from deforming by pressure generated in slight gap 3 and the deformation state of body 1 can be determined as you desire. |
