JPH0639048Y2 - Exhaust silencer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to an exhaust silencer, and more particularly to an exhaust silencer having coaxially arranged inner and outer double filters.

<< Prior Art >> In a conventional exhaust silencer having a double or multiple filter, an inner filter is first fixed to an exhaust pipe as disclosed in, for example, Japanese Utility Model Publication No. 61-134512. The outer filter is fixed to the inner filter.

<< Problems to be Solved by the Invention >> Therefore, while the inner filter receives heat directly from the exhaust pipe, the outer filter receives heat indirectly via the inner filter. For this reason, there is a temperature difference between the inner filter and the outer filter, and the degree of thermal expansion is different, which may cause peeling at the fixed portion. Further, by fixing the inner filter and the outer filter, the inner and outer filters are broken due to the vibration of the engine together with the above-mentioned causes, and the sound deadening effect of the filter is generated while the sound deadening effect of the double filter is significantly reduced. The problem arises.

Therefore, an object of the present invention is to solve the above-mentioned problems caused by the action of heat of the exhaust gas and to provide an exhaust silencer with improved durability.

<< Means for Solving the Problems >> An exhaust silencer according to the present invention is an exhaust silencer having inner and outer double filters arranged coaxially,
The inner filter that defines the exhaust passage inside and is directly exposed to the exhaust gas flow has the both ends attached to the exhaust pipe, and the outer filter that does not define the exhaust passage and is not directly exposed to the exhaust gas flow is It is characterized by being attached to a casing composed of a tubular shell and an end plate. The portion of the casing to which the outer filter is attached may be either the shell or the end plate, or may be fixed to both.

<Operation and effect of device> In the exhaust silencer of the present invention, as described above,
Since the outer filter is fixed to the casing instead of being fixed to the inner filter, it is possible to prevent the inner and outer filters from being damaged due to a difference in thermal deformation amount between the inner and outer filters. Further, since the casing can be reinforced by the outer filter, the membrane vibration of the shell and the end plate can be prevented.

<< Embodiment >> An exhaust silencer according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

1 is a longitudinal sectional view of an exhaust silencer according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II of FIG.

In the figure, reference numeral e indicates an exhaust pipe, and this exhaust pipe e is
As is clear from Fig. 1, a part of it has been cut off,
The exhaust silencer 1 is attached to this cutout portion. The exhaust silencer 1 includes a casing portion 2 and a filter portion 3. The casing 2 is composed of a tubular shell 4 and annular end plates 5, 5 arranged at both ends of the shell 4.

The filter part 3 is composed of an inner filter 6 and an outer filter 7 which are arranged coaxially with the shell 4. The inner filter 6 has a cylindrical shape having an inner diameter slightly larger than the outer diameter of the exhaust pipe e, and defines an exhaust passage for allowing exhaust gas to flow therein.

On the other hand, the outer filter 7 is composed of two substantially semi-cylindrical parts (hereinafter, referred to as outer filter halves) 8,8. Each of the outer filter halves 8 and 8 is formed by bending a single plate-shaped filter material. The rib portion 10 extending by the length, and the two outer filter halves 8 and 8 are secondly formed from the rib portion 10.
As shown in the drawing, the welded portions 11, 11 are formed so as to extend outward when they are fitted together. Further, the outer filter 7 has its cylindrical both ends bent outward to form welded portions 12, 12 to the end plate 5.

The outer filter 7 comprises the two outer filter halves 8,
The rib portions 10, 10 are welded together in such a way that 8 are joined together so that the semi-cylindrical portions 9, 9 form one substantially complete cylinder. As shown in FIG. 1, the outer filter 7 is welded and fixed to the end plates 5 and 5 at the welds 12 and 12, and as shown in FIG. At 11, it is welded and fixed to the shell 4. In addition, the inner peripheral edge of the end plates 5, 5 and both ends of the cylinder of the inner filter 6 are welded to each other.
3 and 13 are welded to the exhaust pipe e, so that the exhaust silencer 1 is attached to the exhaust pipe e as a whole.

In the embodiment described above, the outer filter is fixed to both the shell and the end plate of the casing, but the outer filter may be fixed to only one of the shell and the end plate. Good. Also, the rib portion 10 does not necessarily have to be formed over the entire length of the outer filter halves 8,8.

As described above, in the exhaust silencer of the present invention, the inner filter that defines the exhaust passage and is directly exposed to the high temperature exhaust gas flow, and the inner filter that does not define the exhaust passage and is not directly exposed to the exhaust gas flow Since the outer filter and the outer filter are not welded and fixed to each other, they do not interfere with each other due to the difference in thermal expansion between them, and it is possible to prevent damage to them. Further, since the outer filter is fixed to the casing, the casing can be reinforced and the occurrence of membrane vibration or the like can be prevented.

[Brief description of drawings]

1 is a longitudinal sectional view of an exhaust silencer according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II of FIG. 1 ... Exhaust silencer, 2 ... Casing part 3 ... Filter part, 4 ... Shell 5 ... End plate, 6 ... Inner filter 7 ... Outer filter

Claims (1)

[Scope of utility model registration request] 1. An exhaust silencer having coaxially arranged inner and outer double filters, wherein both ends of an inner filter which defines an exhaust passage therein and is directly exposed to an exhaust gas flow are exhausted. An exhaust silencer, characterized in that the outer filter, which is attached to the pipe and does not define an exhaust passage and is not directly exposed to the exhaust gas flow, is attached to a casing composed of a tubular shell and an end plate.