| 主权项 |
1. An apparatus that converts a rotational input to a nutating drive for a plurality of diaphragm pistons, the apparatus comprising:
a bearing having an inner race within an outer race, each of the races symmetrically arranged for rotation relative to each other about a longitudinal axis, the inner race circumscribing a central aperture; a wobble plate oriented about the longitudinal axis and having an aperture sized to releasably receive the bearing, the wobble plate extending radially from the longitudinal axis; a bearing contact surface disposed in the aperture of the wobble plate and adapted to support the wobble plate by releasably contacting substantially only the outer race; a spinner body formed as a substantially rigid body having a proximal face and a distal face, wherein the spinner body rotates about a drive axis of rotation of, and rotates synchronously with, a drive shaft; and, an eccentric shaft extending along the longitudinal axis from the distal face and into the central aperture of the bearing, the eccentric shaft making intimate contact with the bearing only at the inner race, wherein the wobble plate is adapted to remain stationary with respect to the longitudinal axis when the spinner body causes the inner race to rotate about the longitudinal axis in response to rotation of the drive shaft about the drive axis of rotation, and wherein the longitudinal axis is offset from and at an acute angle with respect to the drive axis of rotation, and wherein when the bearing is inserted into the aperture, the outer race at each point along the longitudinal axis has an outer diameter that is less than the corresponding inner diameter of the wobble plate aperture adjacent to that point such that the bearing can be freely inserted into and removed from the aperture in the wobble plate without an interference fit between the bearing and the wobble plate. |
