JPS6366686B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an overhead exhaust muffler mounting structure for a forklift.

Conventionally, as a forklift equipped with an overhead exhaust muffler, for example, as shown in FIGS. One end of the meandering exhaust pipe 13 is directly connected to the exhaust pipe 13, and an overhead exhaust muffler 19 is connected to the other end of the exhaust pipe 13 via a main muffler 15 and an overhead exhaust pipe 17.
It was configured by setting up. Note that 21 is a radiator fan, 23 is a radiator, and 25 is an overhead guard.

By the way, in the forklift 1 equipped with such an overhead exhaust muffler 19, the engine 7
The exhaust port 9 is located on the left side of the vehicle body 5 when viewed from the front of the vehicle, and the driver's seat 27 is located on the right side from the front center of the vehicle body when viewed from the front of the vehicle.
An overhead exhaust muffler 19 that is directly connected to the vehicle body 5 is generally provided on the left side of the vehicle body 5 as far away from the driver's seat 27 as possible in consideration of drivability.

However, with such a conventional piping structure of the overhead exhaust muffler 19, the exhaust path between the exhaust port 9 and the overhead exhaust muffler 19 becomes long.
The following problems arise.

In other words, making the exhaust path longer means that the notch in the counterweight 3 becomes larger, and as a result, it becomes difficult to maintain a balance between the weight of the counterweight 3 and the moment in front of the front wheels of the vehicle, which reduces the stability of the vehicle. becomes worse.

In addition, the exhaust pipe 13 meanderes and has a complicated shape, which increases costs and makes it difficult to make it compact.

In order to further increase the noise reduction effect, increasing the capacity of the overhead exhaust muffler 19 will worsen rear visibility, so if you try to increase the capacity of the main muffler 15, the main muffler 15 will become larger and the notch in the counterweight 3 will become larger. As a result, there was a problem that the stability of the vehicle deteriorated as described above.

This invention was devised by paying attention to such conventional problems, and its purpose is to ensure the stability of the vehicle and improve the noise reduction effect without increasing the exhaust path. This provides an overhead exhaust muffler mounting structure for a lift.

In order to achieve the above object, this invention seals the other end of the exhaust pipe that is directly connected to the exhaust port of the engine,
The gist is that an exhaust pipe provided with an overhead exhaust muffler is branched and connected in the middle of the route of the exhaust pipe.

Embodiments of the present invention will be described below with reference to FIGS. 4 and 5.

In the following description, the same components as those of the conventional example shown in FIGS. 1 to 3 are given the same reference numerals, and the description thereof will be omitted.

3 is a counterweight provided at the rear of the vehicle body 5; 7 is an engine; 9 is an exhaust port of the engine 7; one end of an exhaust pipe 13 is directly connected to the exhaust port 9; The other end of the exhaust pipe 13 is connected to one side of a sealed main muffler 29 installed inside the counterweight 3.

The other end of the main muffler 29 is sealed, and a sealed chamber 31 is formed inside the main muffler 29 .

An overhead exhaust muffler 19 is connected to the middle of the path of the exhaust pipe 13 via an overhead exhaust pipe 17 bent to the left side of the vehicle body 5. Therefore, since the overhead exhaust muffler 19 is located at the rear left side of the driver's seat 27 when viewed from the front of the vehicle, it does not obstruct the occupant's rear view.

Note that 21 is a radiator fan, 23 is a radiator, and 25 is an overhead guard.

In this invention, the exhaust gas discharged from the engine flows into the sealed chamber 31 of the main muffler 29 through the exhaust pipe 13 and is muffled there, while the exhaust gas is discharged from the exhaust pipe 13. The air is exhausted to the atmosphere through a branched overhead exhaust pipe 17 and an overhead exhaust muffler 19. At this time, the exhaust gas that has been muffled in the sealed chamber 31 of the main muffler 29 is
The noise will be further muffled by the overhead exhaust muffler 19.

Next, FIG. 6 shows a second embodiment of the present invention, in which the other end of the exhaust pipe 13 directly connected to the exhaust port 9 of the engine 7 is sealed, and the main muffler 15 is inserted into the other end. Similarly, a closed chamber 31 is formed.

According to this embodiment, the same silencing effect as in the first embodiment can be achieved without using the sealed main muffler 29 of the first embodiment.

Note that the other configurations and operations are the same as those of the first embodiment, so the same reference numerals are given and the explanation will be omitted.

Moreover, the main muffler 15 in the above embodiment
By selecting the capacity of the sealed chamber 31, the silencing effect can be further improved.

In this invention, as described above, the other end of the existing exhaust pipe provided on the counterweight is sealed to form a resonance sealed chamber, and at the same time, in the middle of the path of the exhaust pipe,
By branching and connecting an overhead exhaust pipe with an overhead exhaust muffler, the exhaust path can be significantly shortened compared to conventional ones, and the cutout area of the counterweight can also be reduced, reducing the weight of the counterweight and the area in front of the front wheels. This has the effect of improving the balance of moments and improving the stability of the vehicle.

Furthermore, for the same reason, less carbon adheres to the exhaust pipe, and as a result, the amount of exhaust water pushed out by exhaust pressure is reduced, and exhaust resistance is also reduced, making it possible to improve combustion efficiency. Furthermore, since the exhaust path can be simplified, costs can be reduced and the vehicle can be made more compact.

In addition, the other end of the exhaust pipe is sealed to provide a silencing function, and the overhead exhaust pipe is equipped with an overhead exhaust muffler, so the exhaust gas silencing function can be performed in two stages. The noise reduction effect can be improved without increasing the diameter and without narrowing the rear visibility.

[Brief explanation of drawings]

Figure 1 is a side view of a forklift equipped with an overhead exhaust muffler, Figure 2 is a schematic plan view showing the mounting structure of a conventional overhead exhaust muffler, Figure 3 is a schematic side view of Figure 2, and Figure 4 is a side view of a forklift equipped with an overhead exhaust muffler. A schematic plan view of this invention,
FIG. 5 is a schematic side view, and FIG. 6 is an explanatory diagram showing a second embodiment of the present invention. 7... Engine, 9... Exhaust port, 13... Exhaust pipe, 17... Overhead exhaust pipe, 19... Overhead exhaust muffler, 31... Sealed room.

Claims (1)

[Claims] 1. In a counterbalance forklift vehicle, one end of the exhaust pipe is directly connected to the exhaust port of the engine, and a sealed chamber with an exhaust silencing function is formed at the other end of the exhaust pipe, and this sealed chamber is connected inside the counterweight. An installation structure for an overhead exhaust muffler for a forklift, characterized in that the overhead exhaust pipe is placed in a vacant space and is connected to an overhead exhaust pipe equipped with an overhead exhaust muffler placed at the rear of the vehicle by branching in the middle of the path of the exhaust pipe.