| 摘要 |
<p>PURPOSE: To maintain a constant discharge amount by, in inward movement of pistons between an outer dead point and an inner dead, maintaining a sum of absolute values of inward velocities of the pistons to a constant value under a constant pump velocity. CONSTITUTION: During the discharging movement of each of balls 33, inward movement of the ball 33 is accelerated to a predetermined velocity by a cam track 35, subsequently this velocity is kept to a constant value over almost the entire region during the inward movement of the ball 33. Then, when the ball 33 approaches the end of the inward movement, the cam track 35 is formed to make the inward velocity decrease gradually until zero. However, in order to maintain a required and constant discharge amount, the subsequent ball 33 starts the inward movement when the velocity of the previous ball 33 begins lowering. Further, the velocities of the two balls 33 are adjusted by the profile of a cam to make these velocities equal to a certain velocity.</p> |
