| 摘要 |
PROBLEM TO BE SOLVED: To alleviate force due to a difference between coefficients of expansion of a material generated when environmental change such as temperature change is imposed on a product.SOLUTION: A joint part 2a of an insert metal component 2 of an inside of a resin part 1 comprises a part 4 in which a first cross section is different, a part 5 in which a second cross section is different, and a part 6 in which a third cross section is different, wherein the cross sections are consecutive. The part 4 in which a first cross section is different has upper and lower both sides that are a circle round surface, has a cross section that is larger than that of the other two parts, and exhibits an action to prevent macroscopic declination between the resin part 1 and the insert metal component 2. The part 5 in which a second cross section is different is a thin tabular part in which both sides comprise parallel surfaces at a small distance, has the smallest cross section, and exhibits an action of a buffer part to a force generated due to temperature change or the like. The part 6 in which a third cross section is different is a part of a cross section of an intermediate size surrounded by an arc-shaped surface, and exhibits an action to secure airtightness through molecular bonding between a resin part 1 and an insert metal component 2. |
