JP6985970B2 - Tractor - Google Patents

Description

The present invention relates to a tractor on which an engine is mounted.

A general tractor includes an engine housed in an engine room, a muffler that silences the exhaust noise of the engine, an exhaust pipe extending from the muffler, a cooling fan and a radiator arranged in front of the engine, and an engine. It is provided with a bonnet that covers at least above and on both the left and right sides of the room, and the bonnet is formed with an open portion that opens the lower outer side of the engine (see, for example, Patent Document 1). The open portion of the bonnet has a function of discharging the engine cooling air generated by the cooling fan from the engine room. In the tractor of Patent Document 1, the entire open portion of the bonnet is covered with a side cover having a large number of exhaust holes. There is.

Japanese Patent No. 5911392

However, when the entire open portion of the bonnet is covered with a side cover as in the tractor shown in Patent Document 1, not only a large side cover is required, but also a support structure for supporting the side cover is required. Therefore, there is a problem that the cost increases. It is conceivable to omit the side cover, but in this case, the exhaust pipe that becomes hot may be exposed and the operator may accidentally touch the exhaust pipe.

The present invention has been created for the purpose of solving these problems in view of the above circumstances, and the invention of claim 1 describes an engine housed in an engine room and an exhaust sound of the engine. A tractor including a muffler for muffling, an exhaust pipe extending from the muffler, a cooling fan and a radiator arranged in front of the engine, and a bonnet covering at least above and on both the left and right sides of the engine room. The bonnet has an opening portion that opens the lower outer side of the engine, and the exhaust pipe has a front extension portion that extends forward from the muffler in a side view and the front extension portion in a side view. A downward extending portion extending downward from the front end portion of the engine is provided, and the front extending portion and the downward extending portion are arranged in the open portion in a side view and open toward the inside of the aircraft. The first cover portion, which is covered with an exhaust pipe cover having a U-shaped cross section or a U-shaped cross section and covers the downward extending portion of the exhaust pipe cover, is arranged on the side of the front end portion of the engine. The engine cooling air is collected and guided to a second cover portion that covers the forward extending portion.
The invention of claim 2 is the tractor according to claim 1, wherein the first cover portion is inclined so as to be located rearward toward the upper side in a side view.
The invention of claim 3 is the tractor according to claim 1 or 2, wherein the second cover portion includes a rear extension portion extending rearward from the rear end of the front extension portion, and the rear portion thereof. The extension portion is characterized in that it is inclined so as to be located toward the inside of the aircraft toward the rear side in a plan view.

According to the invention of claim 1, the front extension portion and the downward extension portion of the exhaust pipe are arranged in the open portion of the bonnet in a side view, but have a U-shaped cross section or a cross section that opens toward the inside of the machine. Since it is covered with a U-shaped exhaust pipe cover, it is possible to prevent an operator from accidentally touching the exhaust pipe without covering the entire bonnet opening with a side cover, and as a result, the entire bonnet opening is sided. Costs can be reduced compared to the conventional method of covering with a cover. Further, of the exhaust pipe cover, the first cover portion that covers the downward extension portion is arranged on the side of the front end portion of the engine, and is also used as the second cover portion that collects the engine cooling air and covers the front extension portion. Since it is guided, the temperature rise of the exhaust pipe cover itself can be suppressed.
According to the second aspect of the present invention, since the first cover portion is inclined so as to be located rearward toward the upper side in the side view, the collected engine cooling air can be reliably guided to the second cover portion.
According to the third aspect of the present invention, the second cover portion includes a rear extension portion extending rearward from the rear end of the front extension portion, and the rear extension portion is closer to the inside of the aircraft toward the rear side in a plan view. Since it is inclined so as to be located, it is possible to prevent the engine cooling air discharged rearward through the second cover portion from directly hitting the operator who rides behind the engine room.

It is an overall plan view of the tractor which concerns on one Embodiment of this invention. It is an overall side view of a tractor. It is a side view which shows the front part (without front wheel) of a tractor. It is a side view which shows the front part of the body of a tractor (with a front wheel). It is a bottom view which shows the front part of the body of a tractor. It is a top view which shows the front part (without a bonnet) of a tractor. It is a figure which shows the exhaust device of a tractor, (a) is a perspective view of the main part of an exhaust device, (b) is a front view of a caution label.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIGS. 1 to 6, 1 is a traveling machine of a tractor T, and the traveling machine 1 is provided in a front part of the body, an engine mounting part 2 on which an engine E is mounted, and an intermediate part of the body. A driving unit 3 on which an operator rides, a working machine connecting unit 4 provided at the rear of the machine body and capable of connecting various working machines (not shown), and front wheels 5F and rear wheels that support the traveling machine body 1 so as to be able to travel. It is equipped with 5R.

The engine mounting portion 2 is provided with an engine room 6 for accommodating the engine E and a bonnet 7 for opening and closing the engine room 6. The bonnet 7 includes an upper surface portion 7a that covers the upper part of the engine room 6, left and right side surface portions 7b that cover the left and right sides of the engine room 6, and a front surface portion 7c that covers the front of the engine room 6. A headlight 18 is provided on the front surface portion 7c of the bonnet 7, and an intake port 7d for engine cooling air is formed. The intake port 7d is covered with a screen member 19 such as a punching metal having air permeability. ..

Further, the side surface portion 7b of the bonnet 7 is formed with an opening portion 7e that opens the lower outer side of the engine E on the lower end side thereof. The opening portion 7e has a function of discharging the engine cooling air from the engine room 6, and in the conventional tractor, the entire opening portion 7e of the bonnet 7 is covered with a side cover having a large number of exhaust holes. The tractor T according to the embodiment of the invention does not have such a side cover.

A cooling fan 8 that is rotationally driven by the engine E (or an electric motor) is provided on the front surface of the engine E, and a radiator 9 is erected in front of the cooling fan 8. When the engine E is started, engine cooling air is introduced into the engine room 6 from the front of the machine body through the intake port 7d of the bonnet 7 in response to the rotational drive of the cooling fan 8. The introduced engine cooling air passes through the radiator 9 erected in front of the engine E to cool the engine cooling water flowing in the radiator 9, and also passes through the front surface and the surroundings of the engine E to the engine room 6 It is discharged to the outside of the machine from the lower part of the bonnet 7 and the open portion 7e of the bonnet 7.

Further, the engine room 6 is provided with an exhaust device 10 for exhausting the exhaust gas of the engine E to the outside of the machine. As shown in FIGS. 3 to 7, the exhaust device 10 introduces engine exhaust from the introduction port 11a, muffles the exhaust noise and discharges the exhaust gas from the exhaust port 11b, and extends from the exhaust port 11b of the muffler 11. It is provided with an exhaust pipe 12 for discharging and discharging engine exhaust to the lower part of the engine room 6.

The muffler 11 is arranged above the side of the engine E along the front-rear direction, and introduces the engine exhaust from the introduction port 11a provided at the rear end of the upper surface and discharges the engine exhaust from the exhaust port 11b provided at the front end of the lower surface. Exhaust sound is muted in the process up to.

The exhaust pipe 12 has a first outward extending portion 12a extending outward from the exhaust port 11b of the muffler 11 in a plan view and a first extending forward from an outer end portion of the outward extending portion 12a in a side view. The front extension portion 12b, the downward extension portion 12c extending downward from the front end portion of the first front extension portion 12b in the side view, and the downward extension portion 12c extending forward from the lower end portion in the side view. A second forward extending portion 12d is provided.

The first forward extending portion 12b and the downward extending portion 12c are arranged in the open portion 7e of the bonnet 7 in a side view. Further, the second front extending portion 12d is arranged along the front-rear direction in the lower space of the engine room 6, and exhausts the engine exhaust toward the front of the machine body from the exhaust port 12e at the front end. According to the exhaust pipe 12 arranged in this way, the first forward extending portion 12b and the downward extending portion 12c are arranged in the open portion 7e of the bonnet 7 in a side view, so that the exhaust pipe 12 becomes hot. When the first forward extending portion 12b and the downward extending portion 12c are exposed, the operator may accidentally touch the exhaust pipe 12.

In order to solve such a problem, the first forward extending portion 12b and the downward extending portion 12c of the exhaust pipe 12 are covered with the exhaust pipe cover 13. The exhaust pipe cover 13 has a U-shaped cross section that opens toward the inside of the machine, and has a first cover portion 13a that covers the downward extending portion 12c and a second cover portion 13b that covers the first front extending portion 12b. And prepare. According to such an exhaust pipe cover 13, even if the first forward extending portion 12b and the downward extending portion 12c of the exhaust pipe 12 are arranged in the open portion 7e of the bonnet 7 in a side view, the operator mistakenly arranges them. It is possible to prevent direct contact with the exhaust pipe 12. The exhaust pipe cover 13 of the present embodiment is supported in the engine room 6 via the bracket 14, but the support structure of the exhaust pipe cover 13 can be arbitrarily changed.

Further, the first cover portion 13a is arranged on the side of the front end portion of the engine E, and collects the engine cooling air flowing outward by hitting the front end portion of the engine E inside the cover having a U-shaped cross section. 1 It can be guided to the second cover portion 13b that covers the forward extending portion 12b. According to such an exhaust pipe cover 13, the temperature rise of the exhaust pipe cover 13 itself can be suppressed.

Further, the first cover portion 13a of the present embodiment is inclined so as to be located rearward toward the upper side in the side view. According to such a first cover portion 13a, it is possible to surely guide the collected engine cooling air to the second cover portion 13b.

The second cover portion 13b includes a rear extension portion 13c that extends rearward from the rear end of the first front extension portion 12b. The side surface portion 13d of the rear extension portion 13c is inclined so as to be located toward the rear side in a plan view in order to guide the engine cooling air flowing inside the second cover portion 13b to the opening at the rear end. According to such a second cover portion 13b, the engine cooling air discharged rearward through the inside of the second cover portion 13b can be guided toward the inside of the machine body, so that the engine cooling air can be guided from the engine room 6 to the machine body. It is possible to prevent the engine cooling air from directly hitting the feet of the worker who gets on the rear of the engine room 6, as in the case where the engine is discharged to the outside.

The second cover portion 13b of the present embodiment includes a second cover upper portion 13e forming the upper side of the second cover portion 13b and a second cover lower portion 13f forming the lower side of the second cover portion 13b. Be prepared. The upper side portion 13e of the second cover is formed of a punching metal having a large number of holes, and heat trapped inside the second cover portion 13b can be released to the outside of the second cover portion 13b through the large number of holes. .. On the other hand, the lower portion 13f of the second cover is formed of an iron plate having no holes. According to such a second cover lower portion 13f, not only the cost can be suppressed as compared with the case where the entire second cover portion 13b is formed of punching metal, but also it can be used as a place for attaching the caution label 15. It will be possible.

According to the present embodiment configured as described above, the engine E housed in the engine room 6, the muffler 11 that silences the exhaust sound of the engine E, the exhaust pipe 12 extending from the muffler 11, and the engine. A tractor T including a cooling fan 8 and a radiator 9 arranged in front of E, and a bonnet 7 covering at least above and on both the left and right sides of the engine room 6, wherein the bonnet 7 is located on the lower outer side of the engine E. The exhaust pipe 12 has an open portion 7e to be opened, and the exhaust pipe 12 has a first front extension portion 12b extending forward from the muffler 11 in a side view and downward from a front end portion of the first front extension portion 12b in a side view. A downward extending portion 12c that extends, and a first front extending portion 12b and a downward extending portion 12c are arranged in the open portion 7e in a side view, but have a cross section that opens toward the inside of the aircraft. Since it is covered with the character-shaped exhaust pipe cover 13, it is possible to prevent the operator from accidentally touching the exhaust pipe 12 without covering the entire opening portion 7e of the bonnet 7 with the side cover, and as a result, the opening of the bonnet 7 is opened. Cost reduction can be achieved as compared with the conventional case in which the entire portion 7e is covered with a side cover.

Further, of the exhaust pipe cover 13, the first cover portion 13a covering the downward extending portion 12c is arranged on the side of the front end portion of the engine E, and collects the engine cooling air to collect the engine cooling air to collect the first front extending portion 12b. Since it is guided to the second cover portion 13b that covers the exhaust pipe cover 13, the temperature rise of the exhaust pipe cover 13 itself can be suppressed.

Further, since the first cover portion 13a is inclined so as to be located rearward toward the upper side in the side view, the collected engine cooling air can be reliably guided to the second cover portion 13b.

Further, the second cover portion 13b includes a rear extension portion 13c that extends rearward from the rear end of the first front extension portion 12b, and the rear extension portion 13c is located toward the rear side of the aircraft in a plan view. Since it is inclined so as to be inclined, it is possible to prevent the engine cooling air discharged rearward through the second cover portion 13b from directly hitting the worker who gets on the rear of the engine room 6.

The present invention is not limited to the above embodiment, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims. For example, the exhaust pipe cover of the above embodiment has a U-shaped cross section, but may have a U-shaped cross section.

T Tractor 1 Traveling machine 2 Engine mounting part 6 Engine room 7 Bonnet 7e Open part 8 Cooling fan 9 Radiator 10 Exhaust device 11 Muffler 12 Exhaust pipe 12b 1st forward extension part (forward extension part)
12c Downward extension 13 Exhaust pipe cover 13a 1st cover 13b 2nd cover 13c Rear extension 15 Caution label

Claims (3)

An engine housed in an engine room, a muffler that silences the exhaust noise of the engine, an exhaust pipe extending from the muffler, a cooling fan and a radiator arranged in front of the engine, and at least above the engine room. A tractor with a bonnet that covers both the left and right sides.
The bonnet has an opening portion that opens the lower outer side of the engine.
The exhaust pipe is
A front extension that extends forward from the muffler in a side view,
A downward extending portion extending downward from the front end portion of the front extending portion in a side view is provided.
The front extension portion and the downward extension portion are arranged in the open portion in a side view, and are covered with an exhaust pipe cover having a U-shaped cross section or a U-shaped cross section that opens toward the inside of the aircraft.
Of the exhaust pipe cover, the first cover portion that covers the downward extension portion is arranged on the side of the front end portion of the engine, and the second cover that collects engine cooling air and covers the front extension portion. A tractor characterized by leading to a part. The tractor according to claim 1, wherein the first cover portion is inclined so as to be located rearward toward the upper side in a side view. The second cover portion includes a rear extension portion that extends rearward from the rear end of the front extension portion.
The tractor according to claim 1 or 2, wherein the rear extension portion is inclined so as to be located toward the inside of the aircraft toward the rear side in a plan view.

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