JPH0130577Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a muffler structure for a combine harvester in which an engine and a muffler body are located near the bottom of a driver's seat.

In many recent combine harvesters, the engine is located near the bottom of the driver's seat, close to each of these devices, in order to facilitate power transmission to the pre-harvesting section, traveling transmission case, and on-board threshing device. There is. In addition, for combine harvesters, it is desirable to install the muffler structure in a location where it is unlikely to be exposed to floating dust and straw debris generated during operation, and for this reason, it is desirable to install the muffler body near the driver's seat, where there is relatively little floating dust. The exhaust pipe extending from the muffler body is erected toward the top of the fuselage, or is placed along the bottom of the fuselage.

However, on the other hand, because the engine is located near the driver's seat, heat from the engine tends to rise up around the driver's seat.

Moreover, since the muffler body is located near the driver's seat, the hot air from the muffler body and exhaust pipe tends to rise around the driver's seat, and adopting a multiple cover structure for heat insulation increases the equipment space and increases costs. It was hot.

This idea focuses on this situation and aims to provide a muffler structure with high heat insulation effect through simple modification that effectively utilizes the airframe structure.
Examples thereof will be described below based on the drawings.

Fig. 1 shows the engine arrangement in a combine harvester, in which a reaping preprocessing section 1 is arranged at the front, a threshing section 2 is arranged at the rear, and a crawler running section 3 is arranged at the bottom. In a combine harvester in which a driver's seat 4 is provided on one side at a position equivalent to the middle of
An engine 7 is installed above, located near the bottom of the driver's seat 4.

Next, the muffler structure of the engine 7 is shown in Figures 2 to 5.
The diagram will be explained.

The muffler body 8 is connected to the engine 7 via a metal flexible tube 9, and an exhaust pipe 10 extends from the lower surface of the muffler body 8.
is inserted from the front end to the rear end of the square pipe main frame 11 constituting the fuselage frame 5.

To prevent the exhaust pipe 10 from coming into contact with the inner surface of the main frame 11, support fittings 12 are installed at multiple locations in the front and back of the exhaust pipe 10.
It is fixed parallel to the main frame 11 via. At the rear end of the fuselage frame 5, a throttle pipe 13 having a small diameter at the front and rear intermediate portions is connected to communicate with the rear end of the main frame 11. The rear end of the main frame 11 is disposed at the rear end thereof, and the exhaust pipe 10 has an ejector structure that sucks air within the main frame 11 using exhaust gas flowing out from the rear end of the exhaust pipe 10.

Further, the muffler main body 8 is covered with a heat insulating cover 14 with an appropriate gap, and this heat insulating cover 14
A joint cover 16 having a left and right split structure is provided over the bottom plate 15 of the main frame 11 and the front end of the main frame 11. The surrounding space of the muffler body 8 and the internal space of the main frame 11 are communicated through the opening 17 of the bottom plate 15 and the internal space of the joint cover 16, and an appropriate number of cooling air is introduced into the upper outer peripheral surface of the heat insulating cover 14. A port 18 is provided.

The heat insulating cover 14 is fixed to a support bracket 19 provided on the body frame 5 side with a clamp fitting 20.

The muffler structure of the present invention is configured as described above, and when exhaust gas is discharged from the rear end of the exhaust pipe 10 to the outside of the aircraft, the ejector action in the throttle pipe 13 causes
External cold air is sucked in through the cooling air inlet 18 of the heat insulating cover 14, passes through the passage 21 in the main frame 11, and is released together with the exhaust gas.

The ejector structure at the rear end opening of the main frame 11 is modified as shown in FIG. It is also possible to have a narrow configuration and provide a diffusion tube 23 with a large cross-sectional area behind it.
Further, as shown in FIG. 7, it is also possible to provide a small hole 24 in the diffusion tube 23 for introducing outside air.

Further, as the hollow frame through which the exhaust pipe 10 is inserted, in addition to using the main frame 11 as described above, a track frame of the running section 3 may be used. Further, a means for forcing the cooling air to flow over the heat insulating cover 14 and the hollow frame through which the exhaust pipe is inserted may be provided.

The muffler structure of the combine harvester according to the present invention is constructed and operates as described above, so that it exhibits the following effects.

(1) Since the hollow frame that makes up the fuselage frame is used as a heat insulating cover for the exhaust pipe, there is no need for a dedicated cover or space for installing the exhaust pipe.

(2) The muffler body is cooled by the cooling air introduced into the heat insulating cover, and this cooling air is guided into the hollow frame through which the exhaust pipe is inserted, which is located below the engine, and after cooling the exhaust pipe, it is released from the end of the hollow frame. As a result, muffler heat no longer reaches the driver's seat.

(3) Cooling air flows through the hollow frame, which cools the exhaust pipe, lowers the temperature of the exhaust gas, and improves safety.

(4) Since the hollow frame is cooled by the cooling air flowing inside, it is possible to prevent a decrease in strength due to overheating of the hollow frame.

(5) Since the hot air around the engine can be taken into the heat insulating cover through the cooling air inlet of the heat insulating cover, engine heat no longer reaches the driver's seat.

[Brief explanation of the drawing]

The drawings show an embodiment of the muffler structure of a combine harvester according to this invention, FIG. 1 is a schematic side view of the combine showing the engine arrangement state, FIG. 2 is a side view of the muffler structure, and FIG. 3 is A in FIG. 2. -A arrow view, Fig. 4 is a BB sectional view in Fig. 2, Fig. 5
The figure is a sectional view taken along the line CC in FIG. 2, and FIGS. 6 and 7 are side views showing other embodiments of the exhaust pipe terminal end. 4... Driver seat, 7... Engine, 8... Muffler body, 10... Exhaust pipe, 11... Hollow frame, 14...
Heat insulating cover, 18...Cooling air inlet, 21...Hollow frame passage.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a combine harvester in which the engine 7 and the muffler body 8 are located near the bottom of the driver's seat 4, the muffler body 8 is installed side by side with the engine 7, and the exhaust gas extending from the muffler body 8 is installed. The pipe 10 is inserted into a hollow frame 11 for forming the fuselage frame located below the engine 7, and the terminal end of the exhaust pipe 10 is provided in the end opening of the hollow frame 11, and the muffler main body 8 is covered with a heat insulating cover 14. A cooling air inlet 18 is opened at the upper side of this heat insulating cover 14, and a hollow frame 11 is opened at the lower side.
The cooling air introduced into the heat insulating cover 14 from the cooling air inlet 18 is connected to the hollow frame 11 and the exhaust pipe 1 in a ventilable manner.
A muffler structure for a combine harvester, which is configured to discharge air from an end opening of a hollow frame 11 through a passage 21 formed between the hollow frame 11 and the hollow frame 11. 2. The end opening of the hollow frame 11 is configured to have an ejector structure that generates suction negative pressure in the hollow frame internal passage 21 using exhaust gas flowing out from the exhaust pipe 10.
The muffler structure described in section.