Thrust device, fuel injection valve having such a device, and method for manufacturing a thrust transfer element
AssigneeSiemens Aktiengesellschaft
InventorsHeinz Lixl, Guenter Lewentz, Wilhelm Frank
Life of this patent
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Abstract
A device for transferring a thrust, a fuel injection valve with such a device, and a method for manufacturing such a thrust transferring device. To transfer the thrust of an actuator, especially in an injection valve, mechanical tappets are used, which have substantially the shape of a cylinder whose defining surfaces are substantially triangular, with the corners rounded. By the great width of the tappet, broad contact areas are created so that friction during the transfer is reduced.
Claims24
A device for transferring thrust between an actuator and a plunger, the actuator moving a first displacement relative to a body and the plunger moving a second displacement relative to the body, the device comprising:
- a tappet having a first end face, a second end face spaced along an axis from the first end face, and a cylindrical surface surrounding the axis and extending between the first and second end faces, the cylindrical surface having a first contact portion adapted for contiguously engaging the body, a second contact portion adapted for contiguously engaging the actuator, and a third contact portion adapted for contiguously engaging the plunger, the first contact portion including a circumferential segment of a first right circular cylinder having a first radius, the second contact portion including a circumferential segment of a second right circular cylinder having a second radius, and the third contact portion including a circumferential segment of a third right circular cylinder having a third radius, the first, second, and third radiuses being equal;
- and
- a guide having first and second surfaces, the first surface confronting the first end face and the second surface confronting the second end face such that movement of the tappet along the axis is substantially prevented.
A device for transferring thrust between an actuator and a plunger, the actuator moving a first displacement relative to a body and the plunger moving a second displacement relative to the body, the device comprising:
- a tappet having a first end face, a second end face spaced along an axis from the first end face, and a cylindrical surface surrounding the axis and extending between the first and second end faces, the cylindrical surface having a first contact portion adapted for contiguously engaging the body, a second contact portion adapted for contiguously engaging the actuator, and a third contact portion adapted for contiguously engaging the plunger, at least one of the first, second, and third contact portions being a circumferential segment of a right circular cylinder, the second contact portion including a first circumferential segment of a first right circular cylinder having a first radius, a second circumferential segment of a second right circular cylinder having a second radius, and a connecting portion extending between the first and second circumferential segments, the first and second radiuses being equal;
- and
- a guide having first and second surfaces, the first surface confronting the first end face and the second surface confronting the second end face such that movement of the tappet along the axis is substantially prevented.
An injector for supplying fuel to a combustion chamber, the injector comprising:
- a body;
- an actuator generating a thrust with respect to the body;
- a plunger displaceable with respect to the body by the thrust;
- a tappet transferring the thrust from the actuator to the plunger, the tappet having a first end face, a second end face spaced along an axis from the first end face, and a cylindrical surface surrounding the axis and extending between the first and second end faces, the cylindrical surface having a first contact portion contiguously engaging the body, a second contact portion contiguously engaging the actuator, and a third contact portion contiguously engaging the plunger, the first contact portion including a circumferential segment of a first right circular cylinder having a first radius, the second contact portion including a circumferential segment of a second right circular cylinder having a second radius, and the third contact portion including a circumferential segment of a third right circular cylinder having a third radius, the first, second, and third radiuses being equal;
- and
- a guide having first and second surfaces, the first surface confronting the first end face and the second surface confronting the second end face such that movement of the tappet along the axis is substantially prevented.
An injector for supplying fuel to a combustion chamber, the injector comprising:
- a body;
- an actuator generating a thrust with respect to the body;
- a plunger displaceable with respect to the body by the thrust;
- a tappet transferring the thrust from the actuator to the plunger, the tappet having a first end face, a second end face spaced along an axis from the first end face, and a cylindrical surface surrounding the axis and extending between the first and second end faces, the cylindrical surface having a first contact portion contiguously engaging the body, a second contact portion contiguously engaging the actuator, and a third contact portion contiguously engaging the plunger, the second contact portion including a first circumferential segment of a first right circular cylinder having a first radius, a second circumferential segment of a second right circular cylinder having a second radius, and a connecting portion extending between the first and second circumferential segments, the first and second radiuses being equal;
- and
- a guide having first and second surfaces, the first surface confronting the first end face and the second surface confronting the second end face such that movement of the tappet along the axis is substantially prevented.
Dependencies are inferred from the claim text.