Patent ID: 8348644
Filing Date: 2013-01-08
Classification: F04B

Abstract:
1. A pump comprising: a cylinder having an inner peripheral surface, wherein the cylinder defines an outlet-side passage therein; and a plunger that is reciprocably received within the cylinder, wherein: the inner peripheral surface of the cylinder includes a spherical surface part that surrounds the pump chamber; the spherical surface part is defined by a curved surface having a predetermined curvature such that the pump chamber defines a spherical space; the spherical surface part is provided with an opening of the outlet-side passage; the opening of the outlet-side passage has a circular shape when observed from a spherical center of the pump chamber; the inner peripheral surface of the cylinder includes a plunger receiving hole part, a side surface of the plunger sliding on the plunger receiving hole part; the spherical surface part is formed such that the spherical space of the pump chamber has a spherical shape greater than a hemispherical shape; and the spherical space of the pump chamber has a diameter greater than a diameter of the plunger receiving hole part.