US 6,174,219 B1 · Method for matching the spool valve lands in a fuel injector

Abstract

A method is described for matching the lands in a spool valve (300) for a fuel injector. The spool valve (300) has a valve body (340) forming an inside surface (373) to receive the spool (310). The inside surface is measured to locate the position of contact points on the valve body (340). A starting contact point (514) is selected from the contact points on the valve body (340). The starting contact point (514) is transposed to the spool (310). The other contact points are transposed to the spool (300), preferably by using the distances between the other contact points and the starting contact point on the valve body. Grind areas are identified on the spool (310) based on the starting contact point, the other contact points, and specifications for the spool. The grind areas are ground to form lands on the spool (310) that match lands on the valve body (340). Alternatively, the lands on the valve body (340) are made based on the contact points of the spool (310)

Claims38

Dependent claims

A method for matching lands in a spool valve for a fuel injector, wherein the spool valve has a valve body forming an inside surface having an inside diameter to receive a spool having outside diameter, specifications defining the inside surface of the valve body, the valve body having a contact point at a location where a body land connects with a spool land formed by a spool groove on the spool, the method comprising the steps of:

(a) measuring the inside surface;
(b) determining the location of the contact point on the valve body;
(c) identifying a grind area on the spool based on the location of the contact point on the valve body;
and
(d) grinding the grind area to form the spool groove and the spool land.

2 more elements

A method for matching lands in a spool valve for a fuel injector, wherein the spool valve includes a valve body forming an inside surface to receive a spool, the valve body having a first contact point at a first location where a first body land connects with a first spool land formed by a first spool groove on the spool, the valve body having a second contact point at a second location where a second body land connects with a second spool land formed by a second spool groove on the spool, the method comprising the steps of:

(a) measuring the inside surface;
(b) determining the first location and the second location on the valve body;
(c) identifying a first grind area and a second grind area on the spool, the first grind area based on the first location, the second grind area based on the second location;
and
(d) grinding the first grind area and the second grind area, wherein grinding the first grind area forms the first spool groove and the first spool land, and wherein grinding the second grind area forms the second spool grove and the second spool land.

2 more elements

A method for matching lands in a spool valve for a fuel injector, wherein the spool valve has a valve body forming an inside surface having an inside diameter to receive a spool having an outside diameter and specifications defining the spool, the valve body having a plurality of contact points at locations where a plurality of body lands connect with a plurality of spool lands formed by a plurality of spool grooves on the spool, the method comprising the steps of:

(a) measuring the inside surface;
(b) determining the locations of the plurality of contact points on the valve body;
(c) identifying a plurality of grind areas on the spool based on the locations of the plurality of contact points on the valve body;
and
(d) grinding the plurality of grind areas to form the plurality of spool grooves and the plurality of spool lands.

2 more elements

Dependencies are inferred from the claim text.

Method for matching the spool valve lands in a fuel injector

Life of this patent

Method for matching the spool valve lands in a fuel injector

Life of this patent

Abstract

Claims38