JPH0519221Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is intended to reduce the intake noise (resonance noise) generated during the intake stroke of the engine in industrial vehicles such as forklifts, especially engine-driven industrial vehicles. The present invention relates to a structure for reducing intake noise.

(Prior Art) Generally, in an engine-driven forklift, an air cleaner is disposed in the intake process in order to supply clean air to the engine.

Air supplied to the engine passes from the intake port at the top of the head guard pillar (hereinafter simply referred to as the pillar) through the hollow part inside the pillar, and from the opening at the bottom to the inlet pipe and inlet hose (also called the air cleaner pipe). ) is sent to the air cleaner and then to the engine.

(Problems to be Solved by the Invention) However, the intake noise generated during the intake stroke is bothersome for forklift operators, and it is desired to reduce this intake noise.

Conventionally, the inlet pipe was welded to the pillar, so intake noise was reduced by changing the type of inlet hose or inlet pipe. There was a problem in that a large number of parts were required to deal with each forklift.

Further, an early idea for reducing intake noise of this type is that of Utility Model Application No. 155357/1983. This initial design had two pillars as shown in Figure 6.
By forming a small-diameter connecting part 24A and a large-diameter part 24B in the air cleaner hose 24, which connects the opening 22 serving as an inlet near the lower end of the air cleaner 1, and the air cleaner to have a volume change, or as shown in FIG. There is a small diameter portion 26B between the connecting portions 26A and 26A of the inlet pipe 26 that connects the opening 22 of the pillar 21 and the air cleaner.
By forming the large-diameter portion 26C and changing the volume, intake noise is reduced by a resonator effect. In addition, in FIGS. 6 and 7, 25 is an air cleaner suction pipe, and 27 is an air cleaner suction pipe.
is the air cleaner hose, 28 is the discharge duct, 2
9 is a frame.

However, the earlier design mentioned above had no air cleaner hose 24 or inlet pipe 26.
Since the shape is a special shape, there was a problem that it was difficult to manufacture.

Therefore, the present invention is an attempt to improve the problem in order to solve the above-mentioned problems.In order to prevent the intake noise generated during the intake stroke of the engine from affecting the operator as a noise source, We have developed an intake noise reduction structure that is convenient because it reduces the number of parts, requires fewer parts, is easy to manufacture, and can easily be adjusted from the outside to reduce intake noise after assembly. It is about providing.

(Means for solving the problems) In order to solve the above problems, the means of the present invention are as follows:
In an industrial vehicle in which an air cleaner is connected to an air exhaust opening at the bottom of a head guard pillar via an inlet pipe and an inlet hose, the inlet pipe has an inlet hose connected to one end and an inlet hose connected to the other end. The inlet pipe is screwed into the opening of the head guard pillar by adjusting the amount of insertion into the opening, and a portion of the inlet pipe that can be screwed into the opening remains on the outside of the opening of the screwed inlet pipe. It is characterized by letting you do it.

(Function) In the assembly process, the inlet pipe is inserted by a predetermined amount into the hollow portion of the pillar. If the amount of insertion of the inlet pipe is inappropriate, the amount of insertion can be adjusted by operating the outside of the inlet pipe. Intake noise can be reduced by appropriately inserting the inlet pipe.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 5.

FIG. 1 shows an engine-driven forklift 1, in which a lift mechanism 3 is attached to the front of a machine base 2. As shown in FIG. On the frame 4 of the machine stand 2, a pair of pillars 5A, 5B is installed in the front and rear, and each pillar 5A,
A ceiling frame is provided between the upper ends of 5B, and a roof 6 is formed. A pair of left and right pillars 5B arranged at the rear of each pillar 5A, 5B has a hollow portion 7
One (left) pillar 5B has an air intake port 8 at the top, and an air exhaust opening 9 at the bottom for connecting an inlet pipe 10. . Note that a drip-proof cover (not shown) is attached to the inlet 8 to prevent raindrops from entering. The lower opening 9 is provided with a female thread 11 through which an inlet pipe 10 can be inserted into the hollow portion 7 of the pillar 5B. A predetermined length of the outer surface of one end of the inlet pipe 10 (the connection side of the opening 9) is an insertion portion 10A, and the female thread 1 of the opening 9
1 is provided with a male screw 12 which can be screwed into the opening 9 so that it can be fully inserted into the hollow part 7 of the opening 9. A part of the outside of the insertion portion 10A is a portion inserted into the opening 9 (insertion amount), and since the insertion portion 10A is made sufficiently longer than the predetermined insertion amount, the insertion portion 10A inserted into the opening 9 A remaining insertion portion 10A will be formed outside the opening 9. Note that the amount of insertion into the opening 9 is determined by the type of engine.

The other end of the inlet pipe 10 can be inserted and connected into an inlet hose 13.

Thus, the insertion portion 10A of the inlet pipe 10 is threadedly connected to the opening 9 of the pillar 5B.
An end of an inlet hose 13 connected to an air supply port 15 of an air cleaner 14 is inserted into the other end of the inlet pipe 10, and a remaining plug is inserted outside the opening 9 of the inlet pipe 10. A portion 10A is provided. Note that metal stopper bands (not shown) are wrapped around both ends of the inlet hose 13 to ensure the connection.

Thus, the air supplied to the engine passes through the hollow part 7 of the pillar 5B from the intake port 8 at the top of the pillar 5B, passes through the opening 9 at the bottom, the inlet pipe 10, and the inlet hose 13 to the air cleaner 1.
4 and is supplied to the engine from the clean air outlet 16 of the air cleaner 14 (via the air connector).

Now, the engines installed in machine 2 have intake noise characteristics depending on their type (displacement or gasoline vs. diesel engine). becomes smaller. Therefore, depending on the type of engine, there are 10 inlet pipes and 1 insertion part.
If the amount of insertion of 0A into the pillar 15B is inappropriate, the insertion portion 10A remaining outside the opening 9
By adjusting the amount of insertion by operating the outside of the inlet pipe 10 to make the insertion amount appropriate, the intake noise can be adjusted to be small. For example, engine
In EA, as shown in FIG. 4, the intake noise is reduced by reducing the insertion amount a of the inlet pipe 10. And the engine
In EB, as shown in FIG. 5, intake noise can be reduced by increasing the insertion amount b of the inlet pipe 10.

The inlet hose 13 is the inlet pipe 10
It is connected by inserting it into the inlet pipe 1.
The only change in the insertion amounts a and b between the inlet hose 13 and the pillar 5B is the insertion amount of the inlet hose 13.
On the connection side of 0, the distance between the end face of the inlet hose 13 and the pillar 5B (see Figures 4 and 5) can be fixed, and the inlet hose 13 can be connected without having to prepare various lengths. , one type can be used.

In the above-mentioned embodiment, the connection between the inlet pipe 10 and the inlet hose 13 was made secure with a stopper band, but the connection between the inlet pipe 10 and the inlet hose 13 was made on the outer surface of the inlet pipe 10. A female thread on the inner diameter of the inlet hose 13 may be screwed into the male thread of the inlet hose 13 for connection. Alternatively, the inlet pipe 10 and the inlet hose 13 may be fixed to each other, and the amount of insertion into the pillar may be adjusted by turning the fixed whole. Furthermore, the forklift intake noise reduction structure described above is applied to general industrial vehicles.

(Effects of the invention) As explained above, the present invention adjusts the amount of insertion of the inlet pipe into the opening when connecting the air cleaner to the opening at the bottom of the pillar via the inlet pipe and inlet hose. Since a portion of the inlet pipe that can be screwed into the opening remains outside the opening of the inlet pipe, the insertion amount can be easily determined in the process of attaching the inlet pipe to the opening. After the opening inlet pipe is installed, if the insertion amount is inappropriate, it is convenient because the insertion amount can be easily adjusted from the outside by operating the outside portion of the inlet pipe. Thus, according to the present invention, intake noise can be reduced by adjusting the insertion amount of the inlet pipe in accordance with the characteristics of the engine. The present invention has a simple structure, is easy to manufacture, and is easy to adjust, since the characteristics of the present invention can be adjusted depending on the type of engine by adjusting the amount of insertion of the inlet pipe into the pillar. Therefore, the present invention has the advantage that it can be applied to various types of engines without increasing the number of parts, compared to conventional intake noise reduction means.

[Brief explanation of the drawing]

1 to 5 show embodiments of the present invention.
The figure is a side view of a forklift equipped with an intake noise reduction structure, Figure 2 is a perspective view of the members forming the intake stroke leading to the air cleaner, and Figure 3 is a flat view of the forklift mainly consisting of the connection between the pillar and the inlet pipe. A cross-sectional view, FIG. 4 shows how the inlet pipe is used, and FIG. 5 shows another way how the inlet pipe is used. 6th
The figure is a sectional view showing an intake noise reduction structure of an early design, and FIG. 7 is a sectional view of another intake noise reduction structure of an early design. 1...Forklift, 5B...Pillar, 7...
...Hollow part, 8...Intake port, 9...Opening, 10...
Inlet pipe, 10A...insertion part, 11
...Female thread, 12...Male thread, 13...Inlet hose, 14...Air cleaner.

Claims (1)

[Scope of utility model registration request] In an industrial vehicle in which an air cleaner is connected to an air exhaust opening at the bottom of a head guard pillar via an inlet pipe and an inlet hose, the inlet pipe has an inlet hose connected to one end and an inlet hose connected to the other end. The inlet pipe is screwed into the opening of the head guard pillar by adjusting the amount of insertion into the opening, and a portion of the inlet pipe that can be screwed into the opening remains on the outside of the opening of the screwed inlet pipe. An intake noise reduction structure for industrial vehicles characterized by: