JPH0330177Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an intake and exhaust pipe device for an engine in a construction vehicle such as a bulldozer.

As shown in FIG. 1, a construction vehicle such as a bulldozer generally has an engine c mounted within a bonnet b in front of a driver's cab a. And the intake pipe d of the engine c in a conventional general construction vehicle of this type.
The exhaust pipe e was projected from the upper surface of the bonnet b.

Although this structure of the intake and exhaust pipe system was reasonable from the point of view of safety and productivity, it was extremely inconvenient in terms of visibility, noise, vibration, and the possibility of damage in forested areas, making it difficult to operate. Nowadays, comfort is becoming a major requirement, and the current situation is that there is a need to improve this intake and exhaust pipe system.

This invention was developed in consideration of the above, and utilizes a protective frame to protect the driver's cab in the event of a fall.
By using the main pillars of the protective frame and the main frame of the vehicle body as intake/exhaust passages, the intake/exhaust pipes are prevented from protruding beyond the bonnet, and the above-mentioned conventional inconveniences can be solved by an engine intake/exhaust pipe device. This is what we are trying to provide.

Embodiments of the present invention will be described below based on FIG. 2 and subsequent figures.

In the figure, 1 is a bulldozer, 2 is a main frame that makes up the vehicle body, 3 is a driver's cab mounted on the rear side of the main frame 2, and 4 is a bulldozer.
is an engine mounted on the front side of the main frame 2, and 5 is a bonnet that covers this engine 4. Further, 6 is a protective frame that protects the driver's cab 3. This protective frame 6 includes left and right main pillars 7, 8 and an upper connecting frame 9.
It is formed into a portal shape and is hollow. The lower ends of both supports 7 and 8 of this protective frame 6 are fixed to the upper surfaces of the left and right structural members 2a and 2b of the main frame 2. Left and right structural members 2 of the main frame 2 above
a, 2b are hollow, and the hollow portions of both main pillars 7, 8 of the protective frame 6 are formed by each component 2 of the main frame 2.
It communicates with the hollow parts a and 2b.

On the other hand, 10 is an exhaust muffler for the engine 4, and 11 is an intake air purifier for the engine 4. The exhaust pipe 10a of the exhaust muffler 10 is provided on the upper surface of one of the left and right components 2a, 2b of the main frame 2, and the introduction pipe 1 is connected to the component 2a.
2 with a gap in the diameter direction.

Further, the suction pipe 13 of the intake air purifier 11 is connected via a flexible pipe 14 to an introduction pipe 15 provided on the upper surface of the other component 2b of the main frame 2 and communicating with the inside of this component 2b. There is.

A partition plate 16 or the like is provided between the components 2a and 2b of the main frame 2 from the part where the introduction pipes 12 and 15 are provided to the part where the main pillars 7 and 8 of the protective frame 6 are connected. It is separated from other parts and serves as a passage for exhaust gas and air.

Further, the connecting frame 9 of the protective frame 6 is partitioned in the middle, and an exhaust port 17 is provided in the hollow part of one side.
In addition, air intake ports 18 are provided in the other hollow portion on the upper surface of the connecting frame 9 that connects the left and right main pillars 7 and 8 of the protective frame 6, respectively. A filter 19 is interposed in this intake port 18. 20a and 20b are rainwater baffle plates provided in the connecting frame 9, and these baffle plates 20a and 20b, the exhaust port 17, and the intake port 1
Exhaust ports 21a and 21b are provided on the bottom surface between the two.

Furthermore, a cover 23 with a heat insulating material 22 attached is attached to the outside of the main pillar 7 of the protective frame 6 that communicates with the exhaust muffler 10.

In the above configuration, the exhaust silencer 1 of the engine 4
The exhaust gas passing through 0 enters the component 2a through the introduction pipe 12 provided on one component 2a of the main frame 2, and further passes through the main pillar 7 of one of the protection frames 6 to connect the upper part of the protection frame 6. It is discharged from an exhaust port 17 provided in the frame 9.

On the other hand, the intake air of the engine 4 passes through the main column 8, the other component 2b of the main frame 2, and the introduction pipe 15 from the intake air 12, 18 provided in the connecting frame 9 to the intake air cleaner 11.
is inhaled.

The present invention is as described above, and the left and right structural members 2
An engine 4 is installed in front of the main frame 2 made up of a and 2b.
In a construction vehicle equipped with a gate-shaped protective frame 6 on the rear side, both structural members 2a, 2 of the main frame 2
b and the protective frame 6 are configured to be hollow, and the left and right main pillars 7 and 8 of this protective frame 6 are communicated with the left and right structural members 2a and 2b, and the left and right structural members 2a and 2b are connected to each other.
One side is connected to the exhaust silencer 10 of the engine 4, the other side is connected to the intake air purifier 11, and the protective frame 6
An exhaust port 17 that communicates with the exhaust silencer 10 via the main columns 7, 8 and the structural members 2a, 2b is provided on the upper surface of the connecting frame 9 that connects the left and right main columns 7, 8. Since the communicating intake port 18 is provided, the intake and exhaust pipe is composed of the main frame 2 and the protective frame 6, and these do not protrude from the bonnet 5 to the front of the driver's seat, improving visibility. In addition, the intake and exhaust pipe device does not resonate with the bonnet 5, reducing noise and vibration.Furthermore, since the intake and exhaust pipes do not protrude above the bonnet 5, the risk of damage when driving through a forest is significantly reduced. can be lowered. Further, according to the present invention, one of the left and right structural members 2a and 2b of the main frame 2 on which the engine 4 is mounted is connected to the exhaust silencer 10 of the engine 4, and the other is connected to the intake air purifier 11. Therefore, regardless of the mounting position of the engine 4, the exhaust silencer 10 and intake air purifier 11 can be connected to the left and right components 2 of the main frame 2 with short introduction pipes 12, 15 and a simple configuration.
a, 2b. Furthermore, since the exhaust port 17 and the intake port 18 are provided on the upper surface of the connecting frame 9 that connects the left and right main pillars 7 and 8 of the protective frame 6, the noise generated at the exhaust port 17 and the intake port 18 is is diffused upward, and this is the protective frame 6
There is no noise to the operator located below.

[Brief explanation of drawings]

Fig. 1 is a side view of a bulldozer equipped with a conventional intake and exhaust pipe device, Fig. 2 and the following show embodiments of the present invention, Fig. 2 is a side view, and Fig. 3 is a side view of a bulldozer equipped with a conventional intake and exhaust pipe device.
Figure 4 is a cross-sectional view taken along line - in Figure 2, Figure 5 is a partially cutaway side view showing the connection part of the exhaust muffler, and Figure 6 is a cross-sectional view showing the connection part of the intake air purifier. The partially cutaway side view shown in FIG. 7 is a rear view of the engine. 2 is a main frame, 2a and 2b are structural members, 6 is a protective frame, 7 and 8 are main pillars, 10 is an exhaust silencer, 11 is an intake air purifier, 17 is an exhaust port, and 18 is an intake port.

Claims (1)

[Scope of utility model registration request] Main frame 2 composed of left and right structural members 2a and 2b
In a construction vehicle in which an engine 4 is mounted on the front side and a gate-shaped protective frame 6 is erected on the rear side, both structural members 2a, 2b of the main frame 2 and the protective frame 6 are configured hollow, and the protective frame 6 is hollow. The left and right main pillars 7 and 8 of the frame 6 are connected to the left and right structural members 2a and 2b, and the main frame 2
One of the left and right structural members 2a, 2b of the engine 4
The other side is connected to the exhaust silencer 10 and the other side is connected to the intake air purifier 11, and the left and right main pillars 7 and 8 of the protective frame 6
An exhaust port 17 that communicates with the exhaust silencer 10 via the main pillars 7 and 8 and the structural members 2a and 2b, and an intake port 18 that communicates with the intake air purifier 18 are provided on the upper surface of the connecting frame 9 that communicates with the An intake and exhaust pipe device for an engine in a construction vehicle, characterized by: