JPS6036736Y2 - Support structure for thermal expansion parts - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a support structure for a thermal expansion component that aims to reduce stress during thermal expansion.

Generally, in a heat engine, the amount of heat generated is transmitted to each part, and as a result, thermal expansion occurs in the mechanical parts, so support members for the mechanical parts are planned in anticipation of this expansion.

If the support member is not properly designed, the stress due to thermal expansion will exceed its limit and cause damage to the support member.

The present invention is designed to reduce the stress upon expansion by applying a reverse stress to the support member during installation, and this invention will be explained below with reference to embodiments shown in the drawings.

FIG. 1 shows part of the structure of an automobile exhaust system. The right side of a muffler (or thermal reactor) 1 is fixed to a vehicle body 2, and the left side is attached to the vehicle body 2 via a flat plate member 3.

Therefore, since the right side of the muffler 1 is fixed, as the engine operates, the muffler 1 thermally expands to the left.
The flat plate member 3 is bent to absorb this expansion and support the muffler 1.

Figure 2 is a diagram showing the stress generated in the flat plate member 3 due to this expansion.If the horizontal axis is the temperature T and the vertical axis is the stress P, the muffler 1 will be heated as the engine is operated and the temperature rises. The expansion causes the flat plate member 3 to bend and its stress increases, so the stress P becomes a straight line (2) that starts from the 0 point and increases in proportion to the temperature T.

The present invention was devised to reduce this stress P, and in FIG.
The muffler 1 is manufactured in the shape shown in FIG.

That is, the flat plate member is bent by a distance Δ1 between 3' and 3.

This means that an opposite stress ΔP is applied in advance from O to O' on the vertical axis in FIG.

As the muffler 1 expands to the left, the flat plate member 3 decreases the deflection distance Δ1, passes through 3' and eliminates the opposite stress, and further expands to the left to increase the stress.

In other words, in FIG. 2, the temperature becomes a straight line (2) starting from the point O' and rising in proportion to the temperature T.

With respect to the straight line I mentioned earlier, the straight line (2) is always located at a position below the stress ΔP, and the stress is reduced by that amount.

In particular, since there is a stress reduction of ΔP even in the maximum stress state at the right end of FIG. 2, the maximum stress applied to the flat plate member 3 is smaller than that of the conventional one.

As mentioned above, the flat plate member that supports the thermally expandable component is deformed in the opposite direction to the expansion direction so as to apply an opposite stress in advance, and the flat plate member is attached so as to reduce the stress at the time of expansion. It has the advantage of not being subjected to large stress, making it easy to select its constituent materials and dimensions, and preventing damage and ensuring durability.

[Brief explanation of drawings]

FIG. 1 is a structural explanatory diagram showing an embodiment of the present invention, and FIG. 2 is a temperature-stress diagram thereof. 1...Muffler 2...Vehicle body 1. 3゜3'... Flat plate member, ■. ■・・・Stress line, Δ1・・・Deflection distance, 0
．． 0'...Starting point, P. △P...Stress, T...Temperature.

Claims (1)

[Scope of utility model registration request] A flat plate member supporting one end of the thermally expandable component is deformed in a direction opposite to the direction of expansion of the component and attached so as to apply an opposite stress in advance, thereby reducing stress during expansion. Support structure for thermal expansion parts.