JPH0241299Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is mainly used in work vehicles such as combines, which are equipped with a muffler that reduces exhaust noise from the engine and an exhaust pipe that discharges the exhaust after the muffling process. The present invention relates to the structure of an engine exhaust treatment section of a working vehicle.

[Conventional technology]

In this type of engine exhaust treatment structure, the muffler and exhaust pipe gradually become hot as the engine is driven, and the components near the exit of the exhaust pipe are also exposed to exhaust gas and gradually become hot. When floating straw debris adheres to and accumulates on each member, there is a possibility of ignition.

Therefore, in the past, a method of providing a cylindrical cover covering the outer periphery of the engine muffler and exhaust pipe has generally been adopted.

[Problem that the invention attempts to solve]

In the case of such a conventional structure, components near the exit of the exhaust pipe are inevitably heated by the exhaust air as before, and the cover is heated by the radiant heat from the muffler and exhaust pipe. Since it gradually heated up, it was still insufficient as a fire prevention measure.

In view of the above-mentioned circumstances, it is an object of the present invention to make it possible to improve the ignition prevention effect as much as possible through rational modification using the exhaust flow.

[Means for solving problems]

The characteristic configuration of the structure of the engine exhaust treatment section of a working machine according to the present invention is that a cover is provided to cover the engine muffler and the exhaust pipe leading out from the muffler with a passage formed between the outer peripheral surfaces of the engine muffler and the exhaust pipe leading out from the muffler. An ejector part having an intake port formed near the muffler, and between the muffler and the exhaust pipe, or in the middle of the exhaust pipe, or both, sucks the air existing in the passage into the exhaust pipe using the exhaust flow. Further, an ejector portion is provided at a portion of the cover corresponding to the outlet of the exhaust pipe to apply a suction force into the passageway by the exhaust flow.

The functions and effects of the above characteristic configuration are as follows.

[Effect]

(b) By covering the muffler and exhaust pipe with a cover, it is possible to prevent floating straw debris from directly adhering to and accumulating on both.

(b) The temperature of the exhaust gas can be lowered by sucking and mixing atmospheric air into the exhaust pipe by the ejector action of the first ejector part in the middle of the exhaust path. In addition, even near the exit of the exhaust pipe, the temperature of the exhaust gas can be further reduced by sucking and mixing atmospheric air into the exhaust gas discharged from the exhaust pipe by the ejector action of the second ejector section. Therefore, it is possible to suppress heating of the exhaust pipe and the structural members located near the exit thereof due to exhaust gas.

(c) Since low-temperature outside air flows through the passage as a result of the ejector action in both types of ejector sections, the cover can also be cooled at the same time.

[Effect of idea]

Therefore, while it is a simple and inexpensive modification that utilizes the exhaust flow, it has become possible to improve the measures against ignition of floating straw debris as much as possible by lowering the exhaust temperature and cooling the cover.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 3, a threshing device 3 and an engine E are mounted on a body frame 2 equipped with a pair of left and right crawler traveling devices 1, and a planted grain culm is mounted on the front part of the body frame 2. A combine harvester, which is an example of a working machine, is constructed by connecting a reaping section 4 which reaps grains and then transports and supplies the reaped grains to the threshing device 3 so as to be movable up and down.

Next, to configure the structure of the engine exhaust treatment section of such a combine harvester, as shown in FIGS. The connected exhaust pipe 8 is inserted through the front end opening of a square pipe-shaped frame member 2A, which is one of the structural members of the aircraft frame 2, and a first cover part 9A that covers the upper half of the muffler 7 is inserted. A second cover part 9B that covers the lower half of the muffler 7, and this second cover part 9B and the frame member 2A
A third cover portion 9C is provided to cover the exhaust pipe portion located between the frame member 2A of the fuselage frame 2 and the three cover portions 9A, 9B, 9.
C constitutes a cover 9 that covers the muffler 7 and the exhaust pipe 8 while forming an annular passage 10 between the muffler 7 and the exhaust pipe 8.

An air intake port 11 for introducing the atmosphere is formed in the first cover portion 9A of the cover 9, and the exhaust pipe 8
An ejector part 12 is formed in the middle of the frame member 2A, which sucks the air present in the passage 10 into the exhaust pipe 8 using the exhaust flow. An ejector section 13 is formed at a location corresponding to the outlet of the pipe 8, which applies a suction force into the passage 10 by means of an exhaust flow.

The upper ejector portion 12 includes a plurality of portions 8 located at appropriate intervals in the circumferential direction of the exhaust pipe 8.
It is constructed by inwardly stamping and molding each of the parts a.

The ejector portion 13 on the lower side is constructed by squeezing inward a portion 2a of the frame member 2A, which corresponds to the outlet of the exhaust pipe 8.

Next, another example will be described.

(1) As shown in FIG. 4, an ejector part 12 is configured between the muffler 7 and the exhaust pipe 8, which sucks the air present in the passage 10 into the exhaust pipe 8 using the exhaust flow. It may also be carried out.

(2) Ejector portions 12 may be configured at a plurality of locations along the exhaust pipe 8 to draw air present in the passage 10 into the exhaust pipe 8 using the exhaust flow.

(3) Ejector portions 12 are configured between the muffler 7 and the exhaust pipe 8 and in the middle of the exhaust pipe 8, respectively, for sucking air existing in the passage 10 into the exhaust pipe 8 using the exhaust flow. May be implemented.

(4) The muffler 7 and exhaust pipe 8 may be entirely covered with a dedicated cover 9.

[Brief explanation of the drawing]

The drawings show an embodiment of the structure of the engine exhaust treatment section of a working machine according to the present invention, in which Fig. 1 is a longitudinal side view, Fig. 2 is a longitudinal front view, Fig. 3 is a side view of the entire combine harvester, and Fig. 4 is a longitudinal sectional side view. FIG. 7 is a longitudinal side view showing another embodiment. 2... Vehicle body frame, 2A... Frame member,
7...Engine muffler, 8...Exhaust pipe, 9...
Cover, 10... Passage, 11... Intake port, 12,
13... Ejector section.

Claims (1)

[Claims for Utility Model Registration] A cover 9 is provided that covers the engine muffler 7 and the exhaust pipe 8 led out from the muffler 7 with a passage 10 formed between the outer peripheral surfaces thereof, and a cover 9 is provided near the muffler of the cover 9. In addition to forming an intake port 11 at a location, the air existing in the passage 10 is drawn into the exhaust pipe 8 by using the exhaust flow between the muffler 7 and the exhaust pipe 8, or in the middle of the exhaust pipe 8, or both. Further, an ejector part 13 is provided at a portion of the cover 9 corresponding to the outlet of the exhaust pipe 8 to apply a suction force into the passage 10 by the exhaust flow.
The structure of the engine exhaust treatment section of a working machine. The engine exhaust treatment section structure of a working machine according to claim 1, wherein the cover 9 is constructed using a hollow frame member 2A of the vehicle body frame 2.