Coupling Body, Fuel Injection Valve Including Coupling Body, and Method for Manufacturing Coupling Body
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United States of America Patent
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Issued Date -
Aug 3, 2023
app pub date -
May 18, 2021
filing date -
Jul 14, 2020
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Abstract
A method for manufacturing a coupling body includes a press-fitting step of press-fitting a coupling shaft-shaped portion of a valve member into a pit portion of a cap. A peripheral surface of a high-hardness component having a relatively high hardness of an outer peripheral surface of the coupling shaft-shaped portion of the valve member and an inner peripheral surface of the pit portion of the cap includes: a first-stage cylindrical surface having a diameter difference with respect to a peripheral surface of a low-hardness component; and a second-stage cylindrical surface positioned closer to a rear side in a press-fitting direction than the first-stage cylindrical outer peripheral surface and protruding in a radial direction to form a step with respect to the first-stage cylindrical surface. The press-fitting step includes: a first stage at which the peripheral surface of the low-hardness component is deformed in a plastic region by the first-stage cylindrical surface; and a second stage at which the peripheral surface subjected to the deformation in the plastic region is deformed by the second-stage cylindrical surface in an amount smaller than the deformation amount at the first stage.
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