JPS5839522A - Installation structure of overhead exhaust muffler of forklift - Google Patents

Abstract

PURPOSE:To secure the stability of a car and improve the silencing effect by installing the exhaust pipe equipped with an overhead muffler in branched state on the way of the passage of the exhaust pipe. CONSTITUTION:One edge of the exhaust pipe 13 connected to the exhaust port of an engine 7 is connected to one side-surface of the closed-type main muffler 29 installed in a counterweight 3, and an overhead exhaust muffler 19 is connected on the way of the passage to the exhaust pipe 13 through the overhead exhaust pipe 17 bent to the left side of a chassis 5. The exhaust gas from the engine flows into the main muffler 29, and sound is dissipated, and the exhaust gas is discharged into the air, passing through the overhead exhaust pipe 17 and the overhead exhaust muffler 19, and thus the silencing effect can be improved. As the overhead exhaust pipe 17 is connected in branched state, the exhaust passage is shortened, and the notched part of the counterweight 3 can be reduced, and the weight of the counterweight 3 and the moment ahead of the front wheel are balanced remarkably, and the stability of the car is improved.

Description

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

For example, as shown in FIGS. 1 to 3, a forklift truck equipped with an upper exhaust muffler is installed in a counterweight 3 of a forklift truck 1 to an exhaust port 9 of an engine 7 housed inside a vehicle body 5. One end of the meandering exhaust pipe 13 is directly connected to the other end of the exhaust pipe 13, and an overhead exhaust muffler 19 is connected to the main muffler 15 and the IIT upper exhaust pipe trachea 17. 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 exhaust port 9 of the carrot 7 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 closer to the right side of the front center of the vehicle body when viewed from the front of the vehicle. Therefore, in consideration of drivability, it is recommended to install the overhead exhaust muffler 19, which is directly connected to the exhaust port 9, on the left side of the vehicle body 5 as far away from the driver's seat 27 as possible. Common.

However, such a conventional overhead exhaust muffler 19
In the piping structure, the exhaust port 9 and the overhead exhaust muffler 1
This is because the exhaust path with 9 becomes longer.

The following interlayer occurs.

In other words, when the iris path is lengthened, 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 30 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 silencing effect, the upper exhaust muffler 19
If you try to increase the capacity of main muffler 15, the rear visibility will deteriorate if you increase the capacity of main muffler 1.
5 becomes large in size, and the notch in the counterweight 3 becomes large, which causes the same problem as the above-mentioned problem that the stability of the vehicle deteriorates.

This invention was devised by focusing on one point, and its purpose is to ensure the stability of the vehicle and improve the noise reduction effect without jeopardizing the exhaust path. Forklift overhead exhaust muffler installations provide structure.

In order to achieve the above object, the present 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 77 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;
9 is an exhaust port of the engine 7, and 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 mounted inside the counterweight 3.

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

An overhead exhaust muffler 19 is connected to the middle of the path of the exhaust pipe 13 via a brave exhaust pipe 17 bent to the left side of the vehicle body 5. Therefore, since the overhead exhaust muffler 19 is placed in the stirrup on 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.

In addition, 21 is a radiator fan, 23 is a radiator, and this invention has the above-mentioned configuration, and the exhaust gas discharged from the engine passes through the exhaust 13 to the main muffler 29.
The air flows into the sealed chamber 31 and is muffled there, while being exhausted into the atmosphere through the overhead exhaust pipe 17 branched from the exhaust pipe 13 and the 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 further muffled by the overhead exhaust 77r 151.

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 placed inside 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.

Further, by selecting the capacity of the sealed chamber 31 of the main muffler 15 in the above embodiment, 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 resonant sealed chamber, and the exhaust pipe is connected to a point K in the middle of the route of the exhaust pipe.

By branching and connecting a control exhaust pipe with an overhead exhaust 77 roller, the exhaust path can be significantly shortened compared to conventional ones, and the notch part 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 or the like 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 can be sealed to provide a silencing function, and since the overhead exhaust pipe is equipped with an overhead exhaust muffler, 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 shows a forklift equipped with an overhead exhaust muffler.
II side view, Figure 2 is a schematic plan view showing the structure of a conventional overhead exhaust muffler, and Figure 3 is a schematic @ side view of Figure 2, $
FIG. 4 is a schematic plan view of the present invention, FIG. 5 is a schematic side view, and FIG. 6 is an explanatory view showing a second embodiment of the present invention. 7...Engine 9...-Exhaust port 13--
・Exhaust pipe 17--Overhead #Trachea 19...
Overhead exhaust 77 ra 31... Sealed room Figure 1 Figure 116 Procedure Neho official text (method) % formula % 1. Indication of incident Patent application Shotsu 56-137815 No. 2
, Title of the invention Installation of an overhead exhaust muffler on a forklift is Structure 3, Relationship with the case of the person making the amendment Patent applicant address (residence) 2 Takaracho, Kanayō-ku, Yokohama-shi, Kanagawa Prefecture Name (name) (399) Nissan Motor Co., Ltd. company representative
Shun Ishihara 4, Agent address: 1-1-1 Toranomon, Minato-ku, Tokyo 105
No. 8 New Toranomon Building 8th floor Telephone Tokyo (504) 3075, 3076, 3077
No. 6, Subject of amendment (1) Column for the title of the invention in the application (2) Column 7 for the title of the invention in the specification, Contents of the amendment (1) As shown in the attached sheet. (2) In the column of the title of the invention in the specification, the phrase "The installation of an overhead exhaust muffler for a forklift is a structure" is amended to read "The installation of an overhead exhaust muffler for a forklift is a structure." 8. List of attached documents (1) Correction application 1 copy 2-

Claims (1)

[Claims] Connect one end of the exhaust pipe directly to the engine exhaust port, and
A sealed chamber is formed at the other end of the exhaust pipe, and an overhead exhaust pipe equipped with an upper exhaust muffler is branched and connected in the middle of the route of the exhaust pipe. structure.