| 摘要 |
<p>PROBLEM TO BE SOLVED: To suppress a neck part of a piston to deform by bending force of inertia force, and improve durability by forming each spherical seat surface in a single spherical shape, in a device wherein a pair of spherical seat surfaces are recessed on front and rear sides of a single head piston housed in a cylinder bore freely to perform reciprocating motion. SOLUTION: A piston 6 is provided with a pair of spherical seat surfaces 6a, 6b which are recessed face to face in front and rear directions on a driving shaft side of a neck part 6c. In this case, the spherical seat surfaces 6a, 6b are formed in a single sphere B shape around a point O. The point O is disposed in a center surface P of a swash plate 7. The piston 6 is also provided with a head 6e having a hollow part 6d for performing compressing action in a cylinder bore. A shoe is provided with a spherical surface 8a slidably housed in the spherical seat surfaces 6a, 6b, and an end surface 8c slide with the swash plate 7 facing to the spherical surface 8a. The neck part 6c of the piston 6 is shortened in an axial direction, and deformation of the neck part 6c caused by bending force of inertia force is suppressed.</p> |
