JP2896061B2 - Work vehicle silencer mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work vehicle such as a backhoe and, more particularly, to a silencer mounting structure for a work vehicle having a silencer communicating with an intake path of the engine on an engine side of a radiator in an engine room. About.

[0002]

2. Description of the Related Art Conventionally, in a silencer mounting structure for a working vehicle as described above, a support member for supporting a silencer is provided on a body frame forming an engine side with a radiator in an engine room, and this support is provided. For members,
The silencer was attached via a metal band or the like that holds the silencer. In addition, the supply of outside air from the outside air introduction side to the engine on the engine side with the radiator interposed therebetween connects one end of an intake hose passing through a gap between the body frame and the radiator to the engine side and communicates with the engine intake path. This was done by connecting to the intake port of the silencer. Incidentally, the gap between the body frame and the radiator is closed by an elastic sealing material that blocks the inside of the engine room between the outside air introduction side in front of the radiator and the engine side behind the radiator.

[0003]

However, according to the above-mentioned prior art, since a dedicated support member or a metal band is required to attach the silencer to the body frame, the number of manufacturing steps and manufacturing costs can be reduced. There was room for improvement in planning. In recent years, the size of work vehicles has been reduced, and as a result, the engine room has also been reduced, so that the gap between the body frame and the radiator has also become smaller, so that outside air is supplied from the outside air introduction side to the silencer on the engine side. As the intake hose to be inserted, a special one having a flat insertion point for inserting the gap must be used, and there is room for improvement in reducing the manufacturing cost.

An object of the present invention is to reduce the number of manufacturing steps and manufacturing cost in mounting a silencer.

[0005]

According to the present invention, there is provided a silencer mounting structure for a working vehicle having a silencer communicating with an intake path of an engine on an engine side of a radiator in an engine room. The silencer is integrally provided with a rigid intake cylinder portion for sucking outside air from the outside air introduction side across the radiator, and an engine room is formed in each of the main body portion of the silencer and the intake cylinder portion. A connecting portion for connecting to the body frame is provided, and the connecting portion of the intake cylinder portion is a bolt insertion hole formed on a peripheral wall surface attached along the body frame.
It is constituted by a large-diameter tool insertion hole formed on a peripheral wall surface facing the same, and the tool insertion hole is shut off in the engine room between the outside air introduction side in front of the radiator and the engine side behind the radiator. It is arranged at a position to be closed by an elastic sealing material.

[0006]

According to the present invention, the supply of the outside air from the outside air introduction side to the silencer on the engine side is performed via the intake cylinder portion integrally connected to the silencer. Further, the silencer can be attached by connecting the connection portions provided on the main body portion and the intake cylinder portion of the silencer to the body frame, respectively, and the tool insertion hole in the intake cylinder portion is
It becomes blocked by the elastic sealing material.

[0007]

Therefore, according to the present invention, it is not necessary to use a special intake hose for supplying outside air to the silencer.
And, since the silencer can be attached at the connecting part that is easily configured with bolt insertion holes and tool insertion holes, there is no need to use a dedicated support member or metal band for attaching the silencer, and Also, there is no need to take time to attach them. In addition, the tool insertion hole in the intake cylinder is closed by an elastic sealing material provided to block the engine room from the engine side and the outside air introduction side with the radiator therebetween. It is not necessary to newly provide a closing body for closing the cover, and no trouble is required for attaching the closing body. In other words, the number of manufacturing steps and manufacturing costs can be reduced in mounting the silencer.

In addition, the rigid intake cylinder is integrally connected to the silencer so that the cross-sectional area of the intake cylinder in the gap between the body frame and the radiator is large enough to supply outside air to the engine without shortage. Since it is possible to easily secure the combustion efficiency, it is possible to easily improve the combustion efficiency of the engine.

[0009]

An embodiment in which the present invention is applied to a backhoe will be described below with reference to the drawings. FIG. 1 shows the entire side surface of the backhoe. The backhoe includes a traveling machine base 3 having a pair of right and left crawler traveling devices 1 and a dozer device 2, and a vertical axis centered on the traveling machine platform 3. A swivel 4 which is mounted so as to be freely swiveled around, a backhoe device 6 connected to a front portion of the swivel 4 via a swing bracket 5, and a driving cabin 7 which covers a riding operation unit provided at the center of the swivel 4. , And a driving unit 8 disposed at the rear of the swivel 4.

As shown also in FIG. 2, the driving unit 8 includes a rear portion of the swivel 4, an arched frame 9 extending to the left and right of the rear of the swivel 4, a partition 10 separating the swivel 4 back and forth, and a swivel 4. A water-cooled engine 12, a radiator 13 for cooling the cooling water from the engine 12 and supplying it to the engine 12 again, and an outside air in an engine room formed by a body frame F such as a hood 11 covering a rear part of the engine room. It is provided with a suction fan 14 for sucking air into the inside, an air cleaner 15 for filtering air supplied to the engine 12, and a muffler 16 for reducing exhaust noise due to exhaust gas from the engine 12.

As shown in FIG. 1, the hood 11 has
Outside air introduction unit 1 for introducing outside air into the engine room
1a is formed on the left side, and an air discharge portion (not shown) for discharging high-temperature air in the engine room is formed on the right side. On the other hand, as shown in FIG. 2, the radiator 13 partitions the inside of the engine room into an outside air introduction side Ra into which outside air is introduced from the outside air introduction portion 11a of the bonnet 11 and an engine side Rb on which the engine 12 is mounted. The air cleaner 15 forming the intake path La of the engine 12 and the muffler 16 forming the exhaust path Lb of the engine 12 are provided on the engine side Rb. Further, a silencer 17 communicating with an intake path La of the engine 12 is provided on the engine side Rb across the radiator 13 in the engine room. By the way, Figure 3
As shown in FIG. 3, the gap formed between the body frame F forming the engine room and the radiator 13 defining the inside of the engine room is formed by the high-temperature air on the engine side Rb behind the radiator 13 and the outside air introduced in front of the radiator 13. Side R
The inside of the engine room is shut off by the outside air introduction side Ra and the engine side Rb so as not to flow out to the a.

As shown in FIGS.
Is integrally connected to a main body 17A for reducing intake noise caused by air supplied to the engine 12 and an intake cylinder 17B for sucking outside air from the outside air introduction side Ra across the radiator 13 by a rigid sheet metal material. The intake cylinder portion 17B is inserted through a gap formed between the arched frame 9 and the radiator 13.
The cross-sectional area of the intake cylinder 17B in the gap is the engine 1
2 is formed in such a size that air can be supplied without any shortage. Further, each of the main body 17A and the intake cylinder 17B is provided with connecting portions A and B for connecting to the arched frame 9 which is one of the body frames F forming the engine room. The connecting portion A of the main body portion 17A is constituted by an extending portion Aa extending from the peripheral wall surface 17a of the silencer 17 attached along the arched frame 9, and a bolt insertion hole Ab formed in the extending portion Aa. I have. The connecting portion B of the intake cylinder portion 17B is formed by a bolt insertion hole Ba formed in the peripheral wall surface 17a of the silencer 17 attached along the arch type frame 9 and a tool insertion hole Bb formed in the peripheral wall surface 17b opposed thereto. It is configured.
The tool insertion hole Bb is formed to have a larger diameter than the bolt insertion hole Ba so that the bolt fitting portion at the tip of the box wrench can be inserted.

As shown in FIGS. 2 to 4, the arched frame 9 is composed of an exterior frame 9A having a substantially U-shaped cross section and a reinforcing frame 9B having a substantially L-shaped cross section. A nut 9a is welded to an appropriate portion of the reinforcing frame 9B as a portion to be connected to a connecting portion A provided on the main body portion 17A of the silencer 17 by bolt connection. A nut 9b is welded to a portion of the reinforcing frame 9B where the elastic seal member 18 overlaps, as a connected portion to be bolted to a connecting portion B provided on the intake cylinder 17B of the silencer 17.

That is, when the silencer 17 is mounted, the connecting portions A and B of the silencer 17 are connected to the arched frame 9 such that the intake cylinder 17B of the silencer 17 passes through the gap between the arched frame 9 and the radiator 13. Are connected by bolts to the connected portions 9a and 9b, respectively. or,
Intake cylinder 1 for bolt connection with arched frame 9
The tool insertion hole Bb formed in 7B is formed by disposing a nut 9b as a connected portion to the connection portion B of the intake cylinder 17B at a position where the nut 9b is overlapped with the elastic seal material 18 in the reinforcing frame 9B. At 18, the air supplied to the engine 12 is prevented from leaking from the tool insertion hole Bb.

[Other Embodiments] Other embodiments will be listed below. The work vehicle to which the present invention is applied may be a tractor, a combine, or the like. As a body frame F to which the silencer 17 is attached, an engine room is formed and the silencer 1
The tool insertion hole Bb formed in the intake cylinder portion 17B of the nozzle 7 can be set at a position where the tool insertion hole Bb is closed by the elastic sealing material 18. For example, the tool insertion hole Bb may be attached to the partition 10 that separates the turntable 4 from front to back. Good. Connecting part A provided on main body part 17A of silencer 17
Can be variously changed.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is an overall side view of a backhoe.

FIG. 2 is a longitudinal rear view of a driving unit.

FIG. 3 is an upper longitudinal sectional side view of a driving unit.

FIG. 4 is an exploded perspective view showing attachment of a silencer.

[Explanation of symbols]

 Reference Signs List 12 engine 13 radiator 17 silencer 17A main body 17B intake cylinder 17a peripheral wall 17b peripheral wall 18 elastic sealing material A connecting part B connecting part Ba bolt insertion hole Bb tool insertion hole F body frame La intake path Ra outside air introduction side Rb engine side

Claims (1)

(57) [Claims] A radiator in an engine room (13)
A work vehicle equipped with a silencer (17) communicating with an intake path (La) of the engine (12) on the engine side (Rb) with the radiator (Rb) interposed therebetween. 13), a rigid intake cylinder portion (17B) for inhaling the outside air from the outside air introduction side (Ra) across the outside is integrally connected, and a main body portion (17A) of the silencer (17) and the intake cylinder portion (17B). )
Are provided with connecting portions (A) and (B) for connecting to the body frame (F) forming the engine room, respectively.
The connecting portion (B) of the intake cylinder portion (17B) is connected to a bolt insertion hole (Ba) formed in a peripheral wall surface (17a) attached along the body frame (F) and a peripheral wall surface (17b) opposed thereto. The engine is formed by a formed large-diameter tool insertion hole (Bb), and the tool insertion hole (Bb) is provided at the outside air introduction side (Ra) in front of the radiator (13) and at the rear of the radiator (13). A silencer mounting structure for a working vehicle, which is disposed on a side (Rb) at a position closed by an elastic sealing material (18) for blocking the inside of the engine room.