JPH0128261Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention This invention relates to an exhaust system for a general-purpose engine.

Technical background of the invention and its problems Conventionally, in general-purpose engines, there are cases where it is necessary to change the exhaust direction of exhaust gas depending on the type of work machine on which the engine is mounted or the mounting position of the engine. One of the countermeasures is to create multiple types of mufflers with different exhaust hole formation positions and install the appropriate muffler for each engine, but multiple types of mufflers must be kept on hand.
Costs are rising.

As another measure, as shown in FIG. 4, an exhaust guide plate 1 is used to appropriately change the exhaust direction of the exhaust gas. In other words, the muffler body 2
An opening 5 is formed in the muffler cover 3 surrounding the muffler body 2 at a position overlapping with the exhaust hole 4 of the muffler body 2.
A plurality of screw holes 6 are formed around the . The exhaust guide plate 1 is attached to the muffler cover 3 by means of a tightening screw 7 screwed into a screw hole 6 so that the state in which it covers the upper part of the opening 5 and the direction in which it is attached can be freely adjusted. The opening direction of the exhaust gas outlet 8 surrounded by the tip side of the exhaust guide plate 1 and the muffler cover 3 can be changed by changing the mounting direction of the exhaust guide plate 1.
By changing the mounting direction of the exhaust guide plate 1, exhaust can be exhausted in any direction. however,
When the exhaust gas from the muffler body 2 collides with the exhaust guide plate 1 and changes its flow direction, it generates a large impact sound, and the impact noise increases especially during sudden acceleration or high load, which is harmful to workers. It's extremely unpleasant.

Purpose of the invention This invention was devised in view of the above points, and allows the direction of exhaust gas to be easily changed without changing the structure of the muffler, and also prevents the generation of impact noise due to the exhaust gas. The purpose of this invention is to obtain an exhaust system for a general-purpose engine that provides high fuel efficiency.

Summary of the idea This idea changes the exhaust direction of exhaust gas to any direction by providing an exhaust guide facing the exhaust hole of the muffler body, and attaches a wire mesh inside the exhaust guide with a gap of a predetermined size. The exhaust gas is configured to reduce the force with which the exhaust gas hits the exhaust guide, and to prevent the generation of impact noise when the exhaust gas hits the exhaust guide and changes its flow direction.

Embodiment of the invention An embodiment of the invention will be described based on FIGS. 1 to 3. Note that the same parts as those explained in FIG. 4 are designated by the same reference numerals, and explanations thereof will be omitted.

A wire mesh 9 bent to follow the shape of the exhaust guide plate 1 is attached to the inside of the exhaust guide plate 1, which is an exhaust guide, and is attached to the muffler cover 3 by a tightening screw 7. This wire mesh 9 is welded to the exhaust guide plate 1 on the flange portion 11 side of the exhaust guide plate 1 in which the screw mounting holes 10 are formed, and has a gap 12 of a predetermined size between it and the exhaust guide plate 1 in other parts. is provided.

In such a configuration, the exhaust guide plate 1 is removably attached to the muffler cover 3 by a tightening screw 7, and in the attached state shown in FIG. 1, the direction of exhaust gas exhaust is in the direction of arrow a. . and,
By attaching the exhaust guide plate 1 using another screw hole 6 and rotating it around the opening 5 from the state shown in FIG. 1, the exhaust direction can be changed to any direction. That is, by simply changing the mounting direction of the exhaust guide plate 1, exhaust can be carried out in any direction without changing the structure of the muffler body 2.

Next, the exhaust gas from inside the muffler body 2 collides with the exhaust guide plate 1, changes its flow direction, and reaches the exhaust gas outlet 8, but the force is weakened by the wire mesh 9, and the exhaust gas collides with the exhaust guide plate 1. This prevents impact noise from occurring when the direction of the flow changes. Therefore, you can work comfortably. Furthermore, since the wire mesh 9 and the exhaust guide plate 1 are located outside the muffler body 2 with a predetermined distance apart, the outflow of exhaust gas from the muffler body 2 is not restricted, and the output of the engine is not impaired.

In this embodiment, the exhaust guide plate 1 is attached to the muffler cover 3, but it may be attached directly to the muffler body 2.

Effects of the invention This invention allows the exhaust direction to be changed to any direction without changing the structure of the muffler body by changing the mounting direction of the exhaust guide as described above, thereby eliminating restrictions on the exhaust direction. Even in certain cases, the same type of engine can be used widely, and the simple structure of installing a wire mesh inside the exhaust guide with a gap of a predetermined size,
It has the effect of weakening the force with which the exhaust gas hits the exhaust guide, preventing the generation of impact noise when the exhaust gas hits the exhaust guide and changing the flow direction, and making work more comfortable. .

[Brief explanation of the drawing]

Fig. 1 is an overall front view showing one embodiment of this invention, Fig. 2 is an enlarged cross-sectional view taken along the line A-A in Fig. 1, and Fig. 3 is an enlarged perspective view showing the exhaust guide plate and wire mesh. , FIG. 4 is a sectional view of a conventional example. 1...Exhaust guide plate (exhaust guide plate), 2...Muffler body, 4...Exhaust hole, 9...Wire mesh, 12...Gap.

Claims (1)

[Scope of utility model registration request] An exhaust system for a general-purpose engine, characterized in that an exhaust guide is provided facing the exhaust hole of the muffler body and changes the exhaust direction of exhaust gas in any direction, and a wire mesh is attached to the inside of the exhaust guide with a gap of a predetermined size. .