Low leakage seat valve guide
AssigneeInternational Engine Intellectual Property Company, LLC
InventorMaximilian Herbert Kronberger
Life of this patent
Estimating the term…
Abstract
An apparatus for setting a clearance has a movable body and a valve guide. A valve body is disposed along the axis of the movable body, and a bore hole is formed in the movable body. The bore hole is formed on the axis and includes a first bore with a first diameter, a receiving surface, and a second bore. A tool having a forward surface is inserted into the bore hole and pressed against the receiving surface. The flow of a fluid between the guide cylinder and the movable body is determined and compared against a standard. If it does not meet the criteria, the force is adjusted and reapplied until it meets the desired value.
Claims18
A method for setting a clearance between a guide and a movable body slideably received into the guide, comprising the steps of:
- (a) forming a bore hole in the movable body along a longitudinal axis of the movable body, the bore hole including a first bore having a first diameter;
- (b) forming a receiving surface in the bore hole by forming a coaxial second bore to extend from a bottom of the first bore, the second bore having a second diameter smaller than the first diameter;
- (c) inserting a tool into the bore hole;
- (d) contacting a forward surface of the tool with the receiving surface of the bore hole;
- (e) applying an axial driving force to the tool;
- (f) translating a portion of the axial driving force radially outwardly with the receiving surface;
- (g) responsive to the step of translating, outwardly displacing a wall adjacent to the bore hole;
- (h) relieving the driving force on the tool;
- (i) pressurizing a first volume to a first pressure with a fluid, the first volume in fluid communication with a second volume at a second pressure through the clearance disposed between an outside surface of the movable body and an inside surface of a guide;
- (j) determining a value of either a pressure difference between the first and second volumes or a flow rate of the fluid between the first and second volumes;
- (k) comparing the value against a predetermined standard;
- and
- (l) if the value does not meet the desired standard, adjusting the driving force applied in step (e) and repeating steps (e)-(l).
A fuel injector comprising:
- a movable body having a longitudinal axis and a bore hole, the bore hole being formed in the movable body on the axis and including a first bore having a first diameter and a second bore extending from a bottom of the first bore and having a second diameter smaller than the first diameter;
- a valve guide disposed around the axis and having an inner surface circumferentially adjacent to a portion of an outer surface of the movable body;
- and
- a valve body laterally surrounding the valve guide;
- wherein a clearance between the movable body and the inner surface of the valve guide is less than 2 microns.
An apparatus comprising:
- a movable body having a longitudinal axis;
- a valve guide disposed along the axis and having an inner surface circumferentially adjacent to and radially outwardly disposed relative to a portion of an outer surface of the movable body;
- a valve body laterally surrounding the valve guide;
- a bore hole in the movable body, the bore hole being formed on the axis and including a first bore having a first diameter, a receiving surface, and a second bore extending from a bottom of the first bore, the second bore having a second diameter smaller than the first diameter;
- and
- a tool having a forward surface and a maximum forward surface diameter that is larger than the second diameter, the second bore hole having an axial length that is longer than an axial length of the forward surface, such that the forward surface of the tool abuts the receiving surface in a manner that exerts force radially outwardly from the axis.
Dependencies are inferred from the claim text.