JPH0953444A - Engine working machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a muffler cover from emitting any vibro-noise resonating with an engine vibration, to make the whole exhaust muffler installable easily, and to attach the exhaust muffler without using any separate parts. SOLUTION: An engine side clamp face A is installed in the upper part of an engine case (fan casing 11a) of an negine 3, while an alternator side clamp face B is installed in the upper part of a casing 14 of an alternator 4, and each height of both these clamp faces A and B is set to be flush with each other, and then a muffler body 16 and a muffler cover 15 are jointly clamped to both these clamp faces A and B by a hold-down bolt 22. Then each of elastic supporting members (grommets 23) is interposed between both these clamp faces A and B and the muffler cover 15 is set up in a floating manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine working machine in which an alternator is driven by an engine to generate electric power and the electric power is used to operate a welding machine or the like.

[0002]

2. Description of the Related Art As shown in FIGS. 3 and 4, a conventional engine working machine 100 of this type includes an engine 102 and an alternator 103 for power generation driven by the engine 102 on one chassis 101. And the engine is installed
102 exhaust muffler 104 is engine 102 and alternator 10
It is attached so as to straddle between 3 and.

FIG. 5 is an exploded perspective view of the exhaust muffler 104. As shown in this figure, the exhaust muffler 104 has a lower cover.
A muffler main body 108 is housed in a muffler cover 107 composed of 105 and an upper cover 106. Lower cover
105 is bolted to a mounting portion 109 (see FIG. 4) formed on the upper part of the engine 102 and a mounting surface 110a of a cover bracket 110 mounted as a separate component to the alternator 103, and the upper cover 106 is screwed to the lower cover 105. Can be installed with.

A muffler stay 112 extending from the muffler body 108 is bolted together with the lower cover 105 to the engine.
It is fixed to the mounting part 109 of the 102, which allows the muffler body to
108 is supported by the engine 102. In addition, muffler cover 1
The space between 07 and the muffler body 108 is a cooling duct, and cooling air blown from the mounting portion 109 on the engine 102 side is blown into the space to cool the muffler body 108.

[0005]

However, since the muffler cover 107 is directly fixed to the engine 102 and the alternator 103 by the bolts in this way,
Vibration of 102 propagates to muffler cover 107
The 107 was easy to resonate, and the vibration sound was a cause of noise.

The muffler cover 107 is mounted on the alternator 103 side via the cover bracket 110, and the height of the mounting portion 109 on the engine 102 side and the height of the mounting surface 110a of the cover bracket 110 are different. The positions of the muffler cover 107 and the muffler body 108 were difficult to determine, and the mounting work was difficult. In addition, since it is necessary to prepare the cover bracket 110 as a separate part, the number of parts of the exhaust muffler 104 is increased, which causes a problem such as an increase in cost.

The present invention has been made in order to solve such a problem, and prevents the muffler cover from resonating with engine vibration and producing a vibration noise, and also makes it possible to easily attach the entire exhaust muffler. Moreover, it is an object of the present invention to provide an engine working machine to which an exhaust muffler can be attached without using a separate component.

[0008]

To achieve the above object, in an engine working machine according to the present invention, an engine and an alternator for power generation are installed on one chassis, and an exhaust muffler of the engine and the alternator are installed. This exhaust muffler is installed so as to straddle between the engine and the muffler main body in a muffler cover. Provide the mounting surface on the alternator side on the upper part of the casing, set the height of both mounting surfaces to the same, and tighten the muffler body and muffler cover to both mounting surfaces together with the fixing bolts to secure the muffler cover and both mounting surfaces. A muffler cover is installed in a floating manner with an elastic supporting member interposed therebetween.

With this structure, the vibration of the engine is absorbed by the elastic support member and is not propagated to the muffler cover, so that noise due to resonance of the muffler cover is prevented. In addition, the height of the engine side mounting surface and the height of the alternator side mounting surface are set to the same height, and the muffler body and muffler cover are directly attached to these mounting surfaces with fixing bolts without using separate parts such as brackets. Therefore, the muffler body and the muffler cover can be easily positioned. Further, since the exhaust muffler is installed without using another component such as a bracket, the number of components can be reduced.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of an engine working machine according to the present invention, and FIG. 2 is a view showing an embodiment of the present invention by enlarging a portion II of FIG.

In this engine working machine 1, an engine 3 and an alternator 4 for power generation are arranged in series on a chassis 2, and the alternator 4 is driven by the power of the engine 3 to generate electric power. It has become. A fuel tank 5 is installed above the engine 3 and
The exhaust muffler 6 is attached so as to straddle between the engine 3 and the alternator 4, and an exhaust pipe 7 extending from the engine 3 is connected to the exhaust muffler 6. The chassis 2 is entirely covered with a soundproof cover 8 to reduce engine noise. Further, wheels 9 pivotally supported at the four corners of the chassis 2 enable the engine working machine 1 to move.

The engine case 11 of the engine 3 extends cylindrically toward the alternator 4 side to form a fan casing 11a, and a cooling fan 12 is provided inside the fan casing 11a (see FIG. 2). . This cooling fan
12 is fixed to a drive shaft (not shown) of the engine 3,
It rotates together with the drive shaft when the engine 3 operates. A cooling air outlet 13 is provided on the upper part of the fan casing 11a.

By the way, an engine side mounting surface A is formed on the upper part of the fan casing 11a, and an alternator side mounting surface B is formed on the upper part of the alternator casing 14. These mounting surfaces A and B are formed flat and have the same height. The engine side mounting surface A is formed so as to surround the periphery of the cooling air outlet 13.

On the other hand, the exhaust muffler 6 has a structure in which a muffler main body 16 is housed inside a muffler cover 15 formed in a box shape. The muffler cover 15 is assembled from a lower cover 17 and an upper cover 18. Also, the muffler body
Four support legs 19 are fixed to the four corners of 16, and the tips of these support legs are horizontally bent to form a fastening portion 19a. Then, the bottom surface 17a of the lower cover 17 and the supporting legs
The fastening portion 19a of 19 is fastened to the engine-side mounting surface A and the alternator-side mounting surface B together with the four fixing bolts 22.

A rubber grommet 23 as an elastic supporting member according to claim 1 is fitted in a portion where the fixing bolt 22 penetrates the bottom surface 17a of the lower cover 17, and the core of the grommet 23 has a rigid body. Cylindrical spacer 24 made of
Is inserted, and the fixing bolt 22 is inserted into the spacer 24. The fastening portion 19a of the support leg 19 is placed on the grommet 23 and the spacer 24 and fastened with a fixing bolt 22.

For this reason, the tightening force of the fixing bolt 22 depends on the supporting leg.
Although it is applied to the mounting surfaces A and B through the fastening portion 19a of 19 and the spacer 24, this fastening force does not reach the grommet 23 and the bottom surface 17a of the lower cover 17, so that the lower cover 17,
That is, the entire muffler cover 15 is floatingly installed on the fan casing 11a and the casing 14 through the grommet 23. Further, the muffler body 16 is firmly fixed to the mounting surfaces A and B via the spacer 24.

An opening (not shown) is formed in the bottom surface 17a of the lower cover 17, and the opening is located above the cooling air outlet 13 opening in the engine side mounting surface A. A seal member 25 made of an elastic material such as urethane foam is interposed between the bottom surface 17a of the lower cover 17 and the engine side mounting surface A. Further, the upper cover 18 is also provided with a cooling air discharge port (not shown).

The engine operates to operate the fan casing 11a.
When the cooling fan 12 rotates inside, cooling air is sucked into the fan casing 11a from the engine 3 side and the alternator 4 side as indicated by arrows in FIG. The sucked cooling air is discharged upward from the cooling air outlet 13 and flows into the muffler cover 15, cools the muffler body 16, and is then discharged to the outside from the cooling air discharge port of the upper cover 18. The sealing member 25 prevents the cooling air from leaking between the cooling air outlet 13 and the bottom surface 17a of the lower cover 17.

The engine working machine 1 configured as described above
According to the above, the muffler cover 15 of the exhaust muffler 6 is floatingly installed on the engine side mounting surface A and the alternator side mounting surface B via the rubber grommet 23, so that the vibration of the engine 3 is absorbed by the grommet 23. Being a muffler cover 15
Does not propagate to the muffler cover 15, and the resonance of the muffler cover 15 is prevented. Therefore, generation of noise due to resonance of the muffler cover 15 is suppressed.

Further, the muffler cover 15 and the muffler body 16
Is attached to the engine-side mounting surface A and the alternator-side mounting surface B with the fixing bolts 22, both mounting surfaces A,
Since the height of B is set to be the same and it is not necessary to use a separate component such as the cover bracket 110 unlike the conventional configuration shown in FIG. 5, the muffler cover 15 and the muffler body are
The positioning of 16 is easy, and it is very easy to attach the exhaust muffler 6 as a whole. Moreover, since a large separate component such as the cover bracket 110 is unnecessary, the number of components is reduced, which leads to cost reduction.

In this embodiment, the engine-side mounting surface A and the alternator-side mounting surface B are formed as horizontal surfaces, and the exhaust muffler 6 includes the engine 3 and the alternator 4.
However, for example, both mounting surfaces A and B may be formed as vertical surfaces and the exhaust muffler 6 may be installed on the side surfaces of the engine 3 and the alternator 4.

[0022]

As described above, in the engine working machine according to the present invention, the engine side mounting surface is provided on the upper surface of the engine case of the engine, and the alternator side mounting surface is provided on the upper surface of the alternator casing. Set the surface height to the same level and tighten the muffler body and muffler cover to both mounting surfaces together with the fixing bolts, and place the muffler cover between the muffler cover and both mounting surfaces with an elastic support member. It is characterized by being installed in a floating manner.

With this structure, the engine vibration is not propagated to the muffler cover that is floated through the elastic support member, so that the noise due to the resonance of the muffler cover can be effectively prevented. it can.

Further, the heights of the engine-side mounting surface and the alternator-side mounting surface are set to be the same, and the muffler body and the muffler cover are directly attached to these mounting surfaces by fixing bolts without using separate parts such as brackets. Since the muffler body and the muffler cover are easily positioned, the entire exhaust muffler can be attached very easily.

Moreover, since the exhaust muffler can be installed without interposing another component such as a bracket, the cost can be reduced by reducing the number of components.

[Brief description of drawings]

FIG. 1 is a side view of an engine working machine according to the present invention.

FIG. 2 is a diagram showing an embodiment of the present invention by enlarging a portion II in FIG.

FIG. 3 is a perspective view of an engine working machine showing a conventional technique.

FIG. 4 is a perspective view of an engine working machine showing a conventional technique.

FIG. 5 is an exploded perspective view of an exhaust muffler showing a conventional technique.

[Explanation of symbols]

 1 engine working machine 2 chassis 3 engine 4 alternator 6 exhaust muffler 11 engine case 11a fan casing which is a part of engine case 14 alternator casing 15 muffler cover 16 muffler main body 22 fixing bolt 23 grommet 24 as an elastic supporting member spacer A engine Side mounting surface B Alternator side mounting surface

Claims (1)

[Claims] 1. An engine 3 and an alternator 4 for power generation.
Are installed on one chassis 2, and the exhaust muffler 6 of the engine 3 is attached so as to straddle between the engine 3 and the alternator 4. The exhaust muffler 6 is a muffler cover.
In an engine working machine having a structure in which the muffler body 16 is housed in 15, an engine side mounting surface A is provided on the upper part of the engine case 11 of the engine 3, while an alternator side mounting surface B is provided on the upper part of the casing 14 of the alternator 4, Set the height of both mounting surfaces A and B to be the same and the muffler body
16 and muffler cover 15 fixing bolts on both mounting surfaces A and B
The muffler cover 15 is tightened together at 22, and an elastic support member (23) is interposed between the muffler cover 15 and both mounting surfaces A and B.
An engine working machine characterized by a floating installation.