Member, method of manufacturing the member, and apparatus

A member comprising:

• a base component;
• a first tubular component that has a tubular shape, that includes a tubular portion including a first end surface, and that is supported by the base component;
• and
• a second tubular component that has a tubular shape, that includes a tubular portion including a second end surface, and that is supported by the base component,
• wherein the first tubular component is made of a material whose coefficient of linear expansion is higher than that of the second tubular component,
• wherein one of the tubular portion of the first tubular component or the tubular portion of the second tubular component includes a projection portion that projects from the first end surface or the second end surface,
• wherein the other of the one of the tubular portion of the first tubular component or the tubular portion of the second tubular component includes a recess portion that is recessed from the first end surface or the second end surface, and that is in contact with the projection portion at at least two positions, and
• wherein the first tubular component and the second tubular component are joined with each other such that
• a first clearance is formed between the first end surface and the second end surface for allowing relative movement between the first end surface and the second end surface in a direction in which the first end surface and the second end surface face each other, in a case where the base component and the first tubular component relatively expand or contract with respect to the second tubular component due to change in temperature, and
• a contact state between the projection portion and the recess portion is kept even if the first end surface and the second end surface are relatively moved with respect to each other in the direction in which the first end surface and the second end surface face each other, by one of the projection portion and the recess portion expanding or contracting with respect to another.

A method of manufacturing a member, the method comprising:

• providing:
• a base component,
• a first tubular component that has a tubular shape, that includes a tubular portion including a first end surface, and that is supported by the base component, and
• a second tubular component that has a tubular shape, that includes a tubular portion including a second end surface, that is made of a material whose coefficient of linear expansion is higher than that of the first tubular component, and that is supported by the base component,
• wherein one of the tubular portion of the first tubular component or the tubular portion of the second tubular component includes a projection portion that projects from the first end surface or the second end surface,
• wherein the other of the one of the tubular portion of the first tubular component or the tubular portion of the second tubular component includes a recess portion that is recessed from the first end surface or the second end surface, and that is in contact with the projection portion at at least two positions;
• and
• joining the first tubular component and the second tubular component such that:
• a first clearance is formed between the first end surface and the second end surface for allowing relative movement between the first end surface and the second end surface in a direction in which the first end surface and the second end surface face each other, in a case where the base component and the second tubular component relatively expand or contract with respect to the first tubular component due to change in temperature, and
• a contact state between the projection portion and the recess portion is kept even if the first end surface and the second end surface are relatively moved with respect to each other in the direction in which the first end surface and the second end surface face each other, by one of the projection portion or the recess portion expanding or contracting with respect to another.