Assembly for fuel injector and coating method for the same
AssigneeHyundai Kefico Corporation
InventorsHeonjoon Park, Sungchul Cha
Life of this patent
Estimating the term…
Abstract
An assembly for a fuel injector includes a base material, a coated region formed on a surface of the base material, an uncoated region formed on a surface of the base material, in contact with and supported by a jig, and formed to be partitioned from the coated region so as to prevent the coated region from peeling off during laser welding, and a coating material stacked in a multilayer structure on the coated region. As a result, friction reduction, high hardness, impact resistance, heat resistance, and durability of the assembly may be improved, and a portion requiring the coating may be precisely coated.
Claims16
An assembly for a fuel injector, comprising:
- a base material having a coated region and an uncoated region formed on a surface thereof;
- and
- a coating material stacked in a multilayer structure on the coated region, wherein the coating material includes:
- a bonding layer stacked on the coated region;
- a support layer stacked on an outer surface of the bonding layer;
- and
- a silicon monoxide, diamond-like carbon (SiO-DLC) functional layer stacked on an outer surface of the support layer,
- wherein the uncoated region is formed to be partitioned from the coated region so as to prevent the coated region from peeling off during laser welding.
A coating jig for an assembly for a fuel injector contacted with a base material of the assembly for the fuel injector having a coated region and an uncoated region on a surface thereof to form a coating material including a bonding layer stacked on the coated region, a support layer stacked on an outer surface of the bonding layer, and an SiO-DLC functional layer stacked on an outer surface of the support layer, the coating jig comprising:
- a support portion having one end in an axial direction with and by which the base material having a spherical shape is in contact and is supported and provided so as to form the uncoated region in the base material;
- and
- an attractive force generating portion disposed on an opposite end of the support portion in the axial direction and generating a magnetic force so as to mount the base material;
- wherein the support portion includes:
- a support portion body formed in a cylindrical shape at a predetermined thickness;
- and
- a masking surface formed at one end of the support portion body in the axial direction and concavely formed so as to be in surface-contact with the base material to form the uncoated region on the base material.
A coating method of an assembly for a fuel injector that stacks a coating material having a multilayer structure on a surface of a base material of an assembly for the fuel injector, the method comprising:
- a mounting step of mounting the base material on a jig so as to partition a coated region and an uncoated region of the base material from each other;
- a bonding layer forming step of stacking a bonding layer on an outer peripheral surface of the base material;
- a support layer forming step of stacking a support layer on an outer surface of the bonding layer;
- and
- a functional layer forming step of stacking a silicon monoxide, diamond-like carbon (SiO-DLC) functional layer on an outer surface of the support layer,
- wherein the jig comprises:
- a support portion having one end in an axial direction with and by which the base material having a spherical shape is in contact with so as to form the uncoated region in the base material;
- and
- an attractive force generating portion disposed on an opposite end of the support portion in the axial direction and generating a magnetic force so as to mount the base material.
Dependencies are inferred from the claim text.