| 摘要 |
The annular space (9) within the nonrotating housing (10) stands concentric to the rotation axis of (8) of the cam (6) or crank in pump runs and (9) contains two balls (12) to ride freely round the inside surface (13) of the space (9). The remainder of the space (9) lies empty and free of fluid, using a radial width of space slightly exceeding that of the balls in this direction so that the disbalance as the pump starts moves the balls between the inner and outer walls of the space (9) with the result that sliding friction between balls and between balls and the space limits (9) entrains the balls peripherally as pump starts. The circular groove forming the space (9) has its own releasable cover (15), with space radial width 1/10 to 1/4 mm greater than maximum ball (12) diameter. The outer space wall (13) as ball track runs straight axi-parallel and normal to the largest diameter and thus forms a hollow cylinder of refined steel or hard chromeplated surfaces. The balls are identical in mass and dimension. A permanently fitted counterweight (7) on the housing (10) containing the ring groove (9) faces away from the eccentric part of the cam (6) and/or the connecting rod (5). |
