JPS6113700Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of an engine section of a working vehicle, which is equipped with a bonnet, an engine disposed inside the bonnet, and other related equipment.

Conventionally, in the type of work vehicle that has a muffler noise reduction part installed inside the bonnet, in order to prevent the thermal influence of the engine and muffler from increasing the temperature inside the bonnet, it is shown in Publication No. 51-23014. The muffler is enclosed in a separate compartment to prevent the thermal influence of the muffler from reaching the engine room.
Alternatively, as shown in Japanese Utility Model Application No. 52-79439, there is a known method of actively blowing engine cooling air onto the muffler to cool it; however, in the former case, the muffler's thermal Although it is advantageous in that the influence is less likely to be transmitted to the engine room, since there is no cooling means for the muffler itself, the entire muffler room becomes extremely hot, which is likely to cause a rise in temperature of the muffler itself and the bonnet wall. In the latter case, the engine and muffler are cooled by blowing cooling air directly onto them, which disrupts the flow of cooling air inside the bonnet and delays the discharge of the cooling air. There was the inconvenience of having to constantly blow strong winds.

The present invention takes a completely different perspective from the conventional technology as described above, and is configured to smoothly discharge high-temperature gas inside the bonnet, thereby avoiding a rise in room temperature inside the bonnet and improving the cooling effect of the engine and muffler. The purpose is to provide an engine structure for a work vehicle that can increase the performance.

The structure of the operator's engine according to the present invention is characterized in that a radiator, an engine, and a muffler muffler are installed inside the bonnet from one side wall of the bonnet to the opposite side wall. , are arranged in that order, and an intake port for engine cooling air is formed on the one horizontal side wall facing the radiator, and an intake port for engine cooling air is formed on the other side wall facing the muffler muffler. The exhaust port of the cooling air is formed, and an appropriate interval is provided between the ceiling wall of the bonnet and the upper end of the engine and the upper end of the muffler, and the muffler's muffler is connected to the back of the engine. By locating the upper edges of the intake port and the exhaust port at a lower level than their upper ends and above the respective upper ends of the engine and muffler silencing parts, engine cooling is provided in the upper space within the bonnet. This is because a linear airflow path is formed, and this configuration provides the following effects.

In other words, by locating the muffler's muffling part so that it is hidden behind the engine, and creating a straight, unobstructed cooling air passage in the upper space of the bonnet, the flow of cooling air is smooth and less turbulent. This allows the gas to pass from the intake port side to the exhaust port side, allowing the gas in the upper space inside the bonnet, where high-temperature gas tends to stagnate, to be quickly exhausted. This has the advantage of increasing the cooling effect due to the smooth discharge of gas.

Embodiments of the present invention will be described below with reference to the drawings.

The work machine referred to in the present invention is a crawler type traveling device 1.
A swivel base 3 is provided on the traveling body 2 equipped with a swivel base 3 so as to be rotatable around a vertical axis, and a excavation device 18 consisting of a boom 4, an arm 5, a bucket 6, etc. is provided on the swivel base 3, and the excavation device 18 is configured to be driven and rotated around a vertical axis by the swivel base 3 at its base end, and is configured to be capable of ground excavation and ditch digging, and further has an earth removal plate 7 on the traveling body 2. The arm 8 is pivotally mounted so as to be able to swing up and down, and is configured to be driven and oscillated by a hydraulic cylinder 9 to enable earth removal work.

The engine E is mounted on the swivel base 3 with its output shaft facing in the left-right direction of the aircraft, and a radiator 10 is disposed at the front of the engine.
A silencing section 16a is provided, and a bonnet 13 is provided to cover the entirety.

In the bonnet 13, an engine cooling air intake port 12 is formed in one horizontal side wall 13a at a position facing the radiator 10, and an engine cooling air intake port 12 is formed at another position opposite to the muffler 16's muffler 16a. The cooling air exhaust port 1 is provided on the side wall 13b.
Further, each of the intake port 12 and the exhaust port 14 is formed such that the upper edge of the opening reaches near the top of the bonnet 13, and the upper edge is connected to the engine E and the muffler. It is located at a higher position than the upper end of each of the 16 mufflers 16a, and is configured to form a linear air path for cooling air in the upper space near the ceiling wall 13c inside the bonnet 13.

Muffler 1 connected to engine exhaust pipe 15...
The muffler 16a of No. 6 is supported by a support stand 17 fixed to the engine wall, and its upper end is located at a lower level than the upper end of the engine E, and is arranged so as to be almost hidden behind the back of the engine E. There is. Furthermore, a space sufficient for arranging related equipment such as a hydraulic pump is formed below the support base 17.

Therefore, the outside air sucked in by the outside air suction fan 11 from the intake port 12 side is transferred to the engine E.
At this time, in the upper space near the ceiling wall 13c of the bonnet 13, there is a straight air path from the intake port 12 to the exhaust port 14. As a result, the hot air warmed by the engine E and the muffler 16a of the muffler 16 is smoothly discharged on the engine cooling air flowing through the air passage near the upper space.

[Brief explanation of the drawing]

The drawings show an embodiment of the engine structure of a work vehicle according to the present invention, and FIG. 1 is an overall side view of the work, and FIG.
The figure is a side view of the main part, and FIG. 3 is a plan view of the main part. 12...Intake port, 13...Bonnet, 13
a, 13b...side part, 13c...ceiling wall, 14...
...exhaust port, 16...muffler, 16a...muffler, E...engine.

Claims (1)

[Scope of utility model registration request] Inside the bonnet 13, the bonnet 13
A radiator 10, an engine E, and a muffler 16 muffler 16 are disposed in that order from one horizontal side wall 13a to the opposite side wall 13b. An intake port 12 for engine cooling air is formed in the one horizontal side wall 13a, and an exhaust port 14 for the cooling air is formed in the other side wall 13b at a position opposite to the silencing portion 16a of the muffler 16.
Further, an appropriate distance is provided between the ceiling wall 13c of the bonnet 13 and the upper end of the engine E and the upper end of the muffler 16a, and the muffler 16 is arranged so that the muffler 16 has a muffler 16a at the back of the engine E, which is lower than the upper end of the muffler 16. The upper edges of the intake port 12 and the exhaust port 14 are located at a lower level than the upper end of the intake port, and the upper edges of the intake port 12 and the exhaust port 14 are located above the upper ends of the engine E and the muffler 16 of the muffler 16. By positioning the bonnet 1
3. An engine section structure for a work vehicle, characterized in that a linear circulation air passage for engine cooling air is formed in the upper space of the engine section.