JP2003104071A - Muffler mounting structure in construction equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noise and abnormal sound in a muffler mounting part in a construction equipment constituted so as to discharge exhaust gas from an engine through a muffler. SOLUTION: A buffer material 14 formed of glass cloth is disposed between a circular arc mounting seat 11b formed in a mounting bracket 11 for mounting and supporting the muffler 6 on a housing 3a on the engine 3 side and a lower half of the muffler 6 engaged with the mounting seat 11b, thereby reducing the noise and abnormal sound in the muffler 6 mounting part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a structure for mounting a muffler in a construction machine such as a hydraulic excavator.

[0002]

2. Description of the Related Art Generally, in a construction machine such as a hydraulic excavator, exhaust gas from an engine is constructed to be discharged through a muffler. The muffler usually has a cylindrical shape. , Installed horizontally. This muffler is conventionally mounted and supported on the housing 3a on the engine 3 side via a mounting bracket 11 as shown in FIG. 7, for example. That is, the mounting bracket 11 is fixed to the housing 3 a via the bolts 12, while the mounting seat 1 is fitted onto the lower half of the muffler 6.
It has 1b. The muffler 6 has a flange portion 11c formed on both sides of the mounting seat 11b with U bolts 13 fitted onto the upper half portion of the muffler 6 in a state where the lower half portion of the muffler 6 is fitted to the mounting seat 11b. It is configured to be fixed to the mounting bracket 11 by tightening.

[0003]

By the way, the exhaust gas with high temperature and high pressure from the engine is introduced to the muffler, and the pulsating exhaust gas is introduced, while the vibration from the engine is transmitted to the mounting seat. For this reason, a non-cooperative sound may be generated between the muffler and the mounting seat, which may cause noise or abnormal noise. In order to reduce this, adjustment and tightening of the mounting portion between the muffler and the mounting bracket are performed, but even in this case noise and abnormal noise may not be reduced so much, which is a problem. Therefore, there is a problem to be solved by the present invention.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances in order to solve these problems, and exhausts exhaust gas from an engine through a muffler. In the construction machine configured as described above, a cushioning material is interposed between a muffler and a mounting member for mounting and supporting the muffler. By doing so, the muffler and the mounting member are in a state of being isolated from each other by the cushioning material interposed between them, and noise, abnormal noise, etc. can be effectively reduced. In this case, when the mounting member has a circular arc-shaped mounting seat that is externally fitted to the lower half of the muffler, a cushioning material is provided between the mounting seat and the muffler to increase the height. A soundproof effect can be obtained. Further, in this structure, the muffler is fixed to a mounting member by a U-bolt having an arcuate portion externally fitted to the upper half of the muffler, and a cushioning material is provided between the arcuate portion of the U-bolt and the muffler. The soundproofing effect can be further improved by interposing. Also,
The U-bolt with the arcuate portion fitted on the upper half of the muffler formed in the shape of a flat plate has the advantage that the contact pressure between the U-bolt and the muffler can be reduced. Furthermore, a cushioning material may be wound around substantially the entire circumference of the muffler, and even in this case, a high soundproofing effect can be exhibited. Further, in these materials, it is possible to prevent the cushioning material from being displaced by fixing the cushioning material to the mounting member or the muffler with an adhesive. Furthermore, by making the cushioning material have heat resistance, it is possible to make the cushioning material suitable for a muffler through which high-temperature exhaust gas is introduced. The cushioning material can be formed using, for example, glass cloth.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a hydraulic excavator, and an engine room in which a device around the engine such as an engine 3, a radiator 4, a filter 5, and a muffler 6 is housed in a rear portion of an upper swing body 2 of the hydraulic excavator 1. 7 are provided.

Exhaust gas exhausted from the engine 3 is collected by an exhaust manifold 8 and then guided to a muffler 6 via an exhaust pipe 9 and then exhausted from the muffler 6 via an exhaust duct 10. However, the muffler 6 has a cylindrical shape, and is axially oriented in a substantially horizontal direction in a horizontal position, and a housing 3a on the engine 3 side is mounted via a mounting bracket 11 described later.
It is attached to and supported by.

The mounting bracket 11 is provided with a leg portion 11a fixed to the housing 3a with a bolt 12 and an arc-shaped mounting seat 11b fitted on the lower half of the muffler 6. Further, flange portions 11c are formed on both edges of the mounting seat 11b, and the flange portion 11c is formed with a through hole 11d through which a screw portion 13a of a U bolt 13 described later passes.

Further, although two U bolts 13 are used in the present embodiment, a screw portion 13a is formed at both end portions linearly extending from both ends of the arcuate portion 13b. The arcuate portion 13b is set so as to be fitted onto the upper half of the muffler 6.

Further, 14 is a shock absorbing material (vibration isolating material), and in the present embodiment, a glass cloth having heat resistance is used, but the shock absorbing material 14 is mounted on the mounting seat 11b of the mounting bracket 11. It is sandwiched between the muffler 6 and the lower half of the muffler 6, and is configured to absorb the vibration of both. In this case, the cushioning material 14 can be attached so as to cover the entire surface of the attachment seat 11b, and FIG.
As shown in (B) and (C), it can be attached to a part of the mounting seat 11b, but the mounting portion of the cushioning material 14 is suitable for the shape of the mounting seat 11b and the muffler 6 and the like. It is set to the part where the soundproof effect can be obtained. Further, in order to prevent the cushioning material 14 from being displaced, the cushioning material 14 may be fixed to the mounting seat 11b or the muffler 6 by using an adhesive.

In the structure constructed as described above, when the muffler 6 is mounted on the mounting bracket 11, the lower half portion of the muffler 6 is installed with the cushioning material 14 interposed between the mounting seat 11b and the muffler 6. U fitted to the mounting seat 11b and then fitted to the upper half of the muffler 6
The screw portion 13a of the bolt 13 is passed through the flange portions 11c formed at both edges of the mounting seat 11b, and the screw portion 1
The muffler 6 is attached to the mounting bracket 11 in a vibration-proof state by the cushioning material 14 by tightening the flange portion 11c with a pair of upper and lower nuts 15 and 15a screwed to the 3a. As a result,
The mounting bracket 11 and the muffler 6 are in a state of being isolated from each other by the cushioning material 14 which is interposed between the mounting bracket 11 and the muffler 6, so that noise and abnormal noise can be effectively reduced.

The present invention is not limited to the above-mentioned embodiment, but for example, a cushioning material may be provided at the contact portion between the U-bolt and the muffler, or the cushioning material may be provided over the entire circumference of the muffler. By arranging so as to wind, it is possible to avoid metal contact between the U-bolt and the muffler, and further improve the soundproof effect. Further, the arcuate portion of the U bolt may be formed in a flat plate shape, and in this case, there is an advantage that the contact pressure between the U bolt and the muffler can be reduced.

[Brief description of drawings]

FIG. 1 is a side view of a hydraulic excavator.

FIG. 2 is a diagram showing the inside of an engine room.

FIG. 3 is a view showing a mounting state of a muffler.

FIG. 4 is a view on arrow X in FIG.

FIG. 5 is an enlarged view of a main part.

6 (A), (B) and (C) are views showing an example of attachment of a cushioning material.

FIG. 7 is a view showing a state of attachment of a conventional muffler.

[Explanation of symbols]

3 engine 6 muffler 11 Mounting bracket 11b Mounting seat 13 U bolt 13b arc-shaped part 14 cushioning material

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F01N 7/08 F01N 7/08 D 7/16 7/16 F term (reference) 2D015 CA02 CA03 3D038 BA01 BA14 BB09 BC15 BC24 3G004 AA03 BA04 DA13 EA03 FA07

Claims (8)

[Claims] 1. A construction machine configured to discharge exhaust gas from an engine via a muffler,
A structure for mounting a muffler in a construction machine, wherein a cushioning material is interposed between a mounting member for mounting and supporting the muffler and the muffler. 2. The mounting member according to claim 1, wherein the mounting member has an arc-shaped mounting seat that is externally fitted to the lower half portion of the muffler, while the cushioning member is interposed between the mounting seat and the muffler. Characteristic construction structure of muffler for construction machinery. 3. The muffler according to claim 2, wherein the muffler is fixed to the mounting member by a U-bolt having an arcuate portion externally fitted to the upper half of the muffler, and the arcuate portion of the U-bolt and the muffler are separated from each other. A muffler mounting structure in a construction machine characterized by having a cushioning material interposed therebetween. 4. The muffler mounting structure for a construction machine according to claim 3, wherein an arcuate portion externally fitted to the upper half of the muffler of the U-bolt is formed in a flat plate band shape. 5. The muffler mounting structure for a construction machine according to claim 1, 2, 3 or 4, wherein a cushioning material is wound around substantially the entire circumference of the muffler. 6. The muffler mounting structure in a construction machine according to claim 1, 2, 3, 4 or 5, wherein the cushioning material is fixed to the mounting member or the muffler with an adhesive. 7. The muffler mounting structure for a construction machine according to claim 1, 2, 3, 4, 5 or 6, wherein the cushioning material has heat resistance. 8. The muffler mounting structure for a construction machine according to claim 7, wherein the cushioning material is a glass cloth.