High pressure fuel injector supply pump
View Patent ↗A pump includes a cylinder and a plunger. The cylinder defines an outlet-side passage therein. The plunger is reciprocably received within the cylinder. An inner peripheral surface of the cylinder and an end surface of the plunger define a pump chamber. The outlet-side passage is communicated with the pump chamber. When the plunger reciprocates within the cylinder, fluid inside the pump chamber is pressurized such that fluid is discharged to an exterior through the outlet-side passage. The inner peripheral surface 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, which has a circular shape when observed from a spherical center of the pump chamber.
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 plunger has an end surface;
the inner peripheral surface of the cylinder and the end surface of the plunger define a pump chamber;
the outlet-side passage of the cylinder is communicated with the pump chamber; and
when the plunger reciprocates within the cylinder, fluid inside the pump chamber is pressurized such that fluid is discharged to an exterior of the pump through the outlet-side passage, 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.
2. The pump according to claim 1 , wherein:
the cylinder defines therein an inlet-side passage that is communicated with the pump chamber such that fluid is introduced into the pump chamber through the inlet-side passage;
the spherical surface part is provided with an opening of the inlet-side passage; and
the opening of the inlet-side passage has a circular shape when observed from the spherical center of the pump chamber.
3. The pump according to claim 2 , wherein:
the inlet-side passage is provided such that the spherical center of the pump chamber is positioned on an extension of a center line of the inlet-side passage; and
the outlet-side passage is provided such that the spherical center of the pump chamber is positioned on an extension of a center line of the outlet-side passage.
4. The pump according to claim 3 , wherein:
the inlet-side passage and the outlet-side passage are formed such that an inferior angle formed between the center line of the inlet-side passage and the center line of the outlet-side passage is equal to or greater than 90 degree.
5. The pump according to claim 1 , wherein:
the plunger receiving hole part is integral with the spherical surface part.
6. The pump according to claim 1 , wherein:
the end surface has a curved surface having a shape that corresponds to a shape of the spherical surface part that is opposed to the end surface.
7. 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 plunger has an end surface;
the inner peripheral surface of the cylinder and the end surface of the plunger define a pump chamber;
the outlet-side passage of the cylinder is communicated with the pump chamber; and
when the plunger reciprocates within the cylinder, fluid inside the pump chamber is pressurized such that fluid is discharged to an exterior of the pump through the outlet-side passage, 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 cylinder defines therein an inlet-side passage that is communicated with the pump chamber such that fluid is introduced into the pump chamber through the inlet-side passage;
the spherical surface part is provided with an opening of the inlet-side passage;
the opening of the inlet-side passage has a circular shape when observed from the spherical center of the pump chamber;
the inlet-side passage is provided such that the spherical center of the pump chamber is positioned on an extension of a center line of the inlet-side passage;
the outlet-side passage is provided such that the spherical center of the pump chamber is positioned on an extension of a center line of the outlet-side passage; and
the inlet-side passage and the outlet-side passage are formed such that an inferior angle formed between the center line of the inlet-side passage and the center line of the outlet-side passage is equal to or greater than 90 degrees.
8. The pump according to claim 7 , wherein:
the spherical surface part is formed such that the spherical space of the pump chamber has a spherical shape equal to or more than a hemispherical shape.
9. The pump according to claim 7 , wherein:
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; and
the plunger receiving hole part is integral with the spherical surface part.
10. The pump according to claim 7 , wherein:
the end surface has a curved surface having a shape that corresponds to a shape of the spherical surface part that is opposed to the end surface.