JP2010121526A - Exhaust component cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology capable of reducing the temperature of an exhaust component. <P>SOLUTION: In an exhaust component cover 10 being a cover to be attached to an exhaust component 11 and provided with louvers 12 allowing air to pass therethrough, the louvers 12 has a circular shape formed by joining two semicircles when the exhaust component cover 10 is viewed from outside, the one semicircle is composed of a quarter-spherical shell projecting outward, and the other semicircle is comprised of a quarter-spherical shell depressed so as to be close to the exhaust component. When the inside and outside of the exhaust component cover 10 are communicated with each other through the louvers 12, a convection occurs from the outside of the exhaust component cover 10 to the inside thereof. The convection allows heat to be released outward, resulting in reduction of the temperature of the exhaust component. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an exhaust part cover that covers an exhaust part.

In the exhaust parts extending from the engine, a heat insulating cover called a heat insulator is provided in a high temperature portion such as a catalytic converter or a muffler (see, for example, Patent Document 1).
JP 2000-136720 A (FIG. 2)

Patent document 1 is demonstrated based on the following figure.
FIG. 6 is a diagram for explaining the basic configuration of the prior art, in which an exhaust part cover 102 is put on an exhaust part 101 indicated by an imaginary line.
When the exhaust part cover 102 is covered, the radiant heat generated from the exhaust part 101 can be blocked as shown by the arrow (1).

Incidentally, since the exhaust component cover 102 resonates due to vibration of the exhaust component 101, high rigidity is required.
In this regard, by providing the plurality of convex portions 103 on the upper surface of the exhaust component cover 102, the rigidity of the exhaust component cover 102 can be increased as compared with the case where the surface of the exhaust component cover 102 is a flat surface.

  However, the heat blocked in this way is trapped between the exhaust part 101 and the exhaust part cover 102. As a result, the exhaust part 101 becomes high temperature. If the temperature is high, considerations such as making the material of the exhaust part 101 heat resistant steel are necessary, and the material cost increases. Therefore, it is desired to lower the temperature of the exhaust part 101.

  An object of the present invention is to provide a technique capable of ensuring the rigidity of a cover and air-cooling an exhaust part.

The invention according to claim 1 is a cover attached to an exhaust part, wherein the exhaust part cover is provided with a louver capable of circulating air.
The louver has a semicircular shape when the exhaust part cover is viewed from the outside, and the semicircle is formed of a ¼ spherical shell projecting outward.

The invention according to claim 2 is a cover attached to an exhaust part, wherein the exhaust part cover is provided with a louver capable of circulating air.
The louver has a circular shape formed by combining two semicircles when the exhaust part cover is viewed from the outside, and one semicircle is composed of a quarter spherical shell projecting outward, The semicircle is formed of a 1/4 spherical shell that is recessed so as to approach the exhaust part.

  In the invention according to claim 1, the louver has a semicircular shape when the exhaust part cover is viewed from the outside, and the semicircle is constituted by a ¼ spherical shell projecting outward. Radiant heat that extends linearly from the exhaust component toward the exhaust component cover is shielded by the exhaust component cover.

  On the other hand, by connecting the inside and the outside of the exhaust part cover with the louver, convection is generated from the outside to the inside of the exhaust part cover. This convection can release heat to the outside. Since heat is released to the outside by convection, it becomes difficult for heat to be trapped between the exhaust part and the exhaust part cover, and the temperature of the exhaust part cover can be lowered.

  In the invention according to claim 2, a quarter spherical shell body is provided which is further recessed on the side approaching the exhaust part. Thereby, the amount of air that can be taken in from the outside of the exhaust part cover can be increased, and the cooling performance of the exhaust part can be further enhanced.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a perspective view for explaining an exhaust part cover according to the present invention. The exhaust part cover 10 is disposed so as to cover an exhaust part 11 indicated by an imaginary line, and connects the exhaust part 11 and the outside. A plurality of louvers 12 are provided on the upper surface.

  When the exhaust part cover 10 is attached to the exhaust part 11, the exhaust part cover 10 is passed by passing bolts through the bolt holes 13 and 13 of the exhaust part cover 10 through a stay or the like attached to the exhaust part 11. Install.

FIG. 2 is a cross-sectional view of the exhaust part cover according to the present invention. The formed inner plates 17 and 17 and a plurality of louvers 12 provided on the upper surface of the outer plate 16.
A plurality of punching holes 18 are formed in the inner plate 17. These punching holes 18 are previously opened in a portion of the outer plate 16 that is bent to become the inner plate 17.

By the way, when the pulsation of the exhaust gas is transmitted to the exhaust component 11 in the form of vibration, this vibration is further transmitted to the exhaust component cover 10.
At this time, the natural frequency fn when the exhaust component cover 10 vibrates is represented by fn = 1 / (2π) · (k / m) ^0.5 . k is a spring constant whose value varies depending on the substance, and m is mass.

  Since the inner plate 17 is made of the same material as the outer plate 16, the spring constant k has the same value as that of the outer plate 16. On the other hand, since the mass m of the outer plate 16 and the inner plate 17 is different by the amount that the punching hole 18 is formed in the inner plate 17, the natural frequencies fn of the outer plate 16 and the inner plate 17 are different, and the vibration characteristics can be improved. it can.

  In addition, the rigidity of the exhaust part cover 10 can be increased by making the shape of the louver 12 into a semicircular shape in a sectional view (front view).

3 is a view taken in the direction of arrow 3 in FIG. 2, and the louver 12 has a circular shape formed by combining two semicircles when the exhaust part cover 10 is viewed from the outside.
The semicircle on the upper side of the drawing is a convex portion 21 protruding toward the front side of the drawing, and the semicircle on the lower side of the drawing is a concave portion 22 recessed toward the back side of the drawing.

  4 is a cross-sectional view taken along line 4-4 of FIG. 2. The convex portion 21 is a 1/4 spherical shell projecting outward (upper side of the drawing), and the concave portion is recessed inward (lower side of the drawing). It is a 1/4 spherical shell. The tip 23 of the convex portion 21 and the tip 24 of the concave portion are configured to overlap in plan view.

The following can be said from FIGS.
The louver 12 has a circular shape formed by combining two semicircles (the convex portion 21 and the concave portion 22) when the exhaust component cover 10 is viewed from the outside (FIG. 3), and one semicircle (the convex portion 21). Is composed of a 1/4 spherical shell projecting outward, and the other semicircle (recess 22) is composed of a 1/4 spherical shell recessed so as to approach the exhaust part (reference numeral 11 in FIG. 2). (FIG. 4).

The operation of the exhaust part cover having the above-described configuration will be described below.
FIG. 5 is a diagram for explaining a comparison between an example according to the present invention and a comparative example. As shown in FIG. 5A, in the comparative example 1, the radiant heat is blocked as shown by an arrow (2). However, heat is trapped between the exhaust part 110 and the exhaust part cover 111.

  As shown in (b), in Comparative Example 2 in which a hole 113 is formed on the surface of the exhaust part cover 112, the radiant heat goes directly to the outside as shown by an arrow (3). That is, although heat is not trapped, radiant heat cannot be blocked.

  When the exhaust part cover 10 according to the present invention is used as indicated by an arrow (4) in (c), the radiant heat is blocked by the exhaust part cover 10 and then the arrow (5) in (d). As shown, the exhaust part 11 can be cooled by taking in cooling air from the outside.

  That is, the following can be said from (c) and (d). Radiant heat that extends linearly outward (arrow (4) shown in (c)) hits the exhaust part cover 10 and is shielded from heat. On the other hand, by connecting the inside and outside of the exhaust component cover 10 by the louver 12, convection is generated from the outside to the inside of the exhaust component cover 10. Heat can be released to the outside by this convection, and the exhaust part 11 can be cooled.

  Further, the exhaust component cover 10 can also block the sound that linearly spreads (see (c)) in the same manner as radiant heat.

Another embodiment of FIG. 5 according to the present invention will be described below.
FIG. 6 is a diagram showing another embodiment of FIG. 5, and the louver 12 is composed of only convex portions 21.
Even in such a case, as shown by the arrow (6) in (a), when the exhaust component cover 10 according to the present invention is used, after the radiant heat is blocked by the exhaust component cover 10, As shown by arrow (7) in b), the exhaust component 11 can be cooled by taking in cooling air from the outside.

  The exhaust component according to the present invention may be a catalyzer or a general exhaust pipe in addition to a vehicle muffler.

  The exhaust part cover of the present invention is suitable for protecting a vehicle muffler.

1 is a cover for exhaust parts according to the present invention. It is sectional drawing of the cover for exhaust components which concerns on this invention. FIG. 3 is a view taken in the direction of arrow 3 in FIG. 2. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. It is a figure explaining the comparison with the Example and comparative example which concern on this invention. FIG. It is a figure explaining the basic composition of the conventional technology.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Exhaust part cover, 11 ... Exhaust part, 12 ... Louver, 21 ... Convex part (one semicircle), 22 ... Concave part (the other semicircle).

Claims (2)

In the exhaust part cover provided with a louver capable of circulating air, which is a cover attached to the exhaust part,
The louver has a semicircular shape when the exhaust component cover is viewed from the outside, and the semicircle is constituted by a ¼ spherical shell projecting outward. In the exhaust part cover provided with a louver capable of circulating air, which is a cover attached to the exhaust part,
The louver has a circular shape formed by combining two semicircles when the exhaust part cover is viewed from the outside, and one semicircle is composed of a quarter spherical shell projecting outward, The semicircular shape of the exhaust part cover is composed of a 1/4 spherical shell that is recessed so as to approach the exhaust part.

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