Lash adjuster and method of making same
AssigneeEaton Corporation
InventorsPrasanna Kumar Gudaloor, John Page Chapman, Gary Lynn Janowiak
Life of this patent
Estimating the term…
Abstract
A method of manufacturing a lash adjuster body for use in a lash adjuster assembly can include forming a lash adjuster body to an as-formed condition including an outer cylindrical surface and an inner cylindrical surface. The inner cylindrical surface can have a leak down portion and a blind bore. The method can also include imparting a wear resistant surface layer to at least the leak down portion of the inner cylindrical surface with a sub-critical temperature process. The method can also include preserving the leak down portion in the as-formed condition during imparting of the wear resistant surface layer.
Claims20
A method of manufacturing a lash adjuster body for use in a lash adjuster assembly, the method comprising:
- forming a lash adjuster body to an as-formed condition including an outer cylindrical surface and an inner cylindrical surface having a leak down portion and a blind bore;
- annealing the lash adjuster body to relieve stresses arising during forming;
- subsequent to the annealing, imparting a wear resistant outermost surface layer to at least the leak down portion of the inner cylindrical surface with a sub-critical temperature process using ferritic nitrocarburizing (FNC);
- and
- preserving the leak down portion in the as-formed condition during imparting of the wear resistant surface layer.
A lash adjuster body for use in a lash adjuster assembly, the lash adjuster body comprising:
- an outer cylindrical surface;
- and
- an inner cylindrical surface having a leak down portion and a blind bore, wherein at least the leak down portion of the inner cylindrical surface includes a wear resistant outermost surface layer imparted with a sub-critical temperature process using ferritic nitrocarburizing (FNC) subsequent to annealing to relieve stresses and the leak down portion is preserved in an as-formed condition existing prior to the imparting of the wear resistant surface layer.
A lash adjuster assembly comprising:
- a lash adjuster body having an outer cylindrical surface, an inner cylindrical surface with a leak down portion and a blind bore, wherein at least the leak down portion of the inner cylindrical surface includes a wear resistant outermost surface layer imparted with a sub-critical temperature process using ferritic nitrocarburizing (FNC) subsequent to annealing to relieve stresses and the leak down portion is preserved in an as-formed condition existing prior to the imparting of the wear resistant surface layer;
- and
- a leak down plunger slidably received in the inner cylindrical surface against the leak down portion.
Dependencies are inferred from the claim text.