JP2543190Y2 - Vehicle engine intake system - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a vehicle having a pair of left and right hollow side frames extending in the front-rear direction, such as a cab-over type vehicle, for guiding atmospheric air to an engine mounted on the vehicle. It relates to an intake device.

[0002]

2. Description of the Related Art As a prior art, Japanese Utility Model Application Laid-Open No. 61-1506.
In Japanese Patent Publication No. 27, an air cleaner for purifying intake air to an engine is provided on an upper surface of a middle portion of one of a pair of left and right hollow side frames, and air is introduced into the air cleaner. A pipe is inserted into the one side frame so that the atmospheric air introduction pipe extends in the direction of the rear end of the one side frame, and an air air introduction hole is formed in the front end of the one side frame. Has been proposed.

[0003] In this air intake device, the atmospheric air to the engine flows into the one side frame from the introduction hole at the front end and flows rearward in the one side frame. By flowing into the air cleaner through, the one side frame,
Since it constitutes a part of the atmospheric air introduction pipe having a large cross-sectional area, there is an advantage that suction of water and dust into the air cleaner can be reliably prevented.

[0004]

However, on the other hand, the cross-sectional area of one side frame is not uniform over the entire length of the one side frame. Since the rear half has a large cross-sectional area, the diameter of the atmospheric air introduction pipe inserted into the one side frame is relatively small in the air cleaner portion of the one side frame. It is determined by the area, and the diameter of the atmospheric air introduction pipe cannot be increased, in other words, the flow resistance of the air in the atmospheric air introduction pipe cannot be reduced. There was a problem that it would be a factor.

[0005] The present invention has a technical problem to solve this problem.

[0006]

According to the present invention, an air cleaner for an engine is provided on an upper surface of a middle portion of one of a pair of left and right hollow side frames extending in the front-rear direction. Arrange,
An air air introduction pipe to the air cleaner is inserted into the one side frame so that the air air introduction pipe extends in a longitudinal direction of the one side frame. In an air intake apparatus having an opening provided in a frame and the other end connected to the air cleaner, the air introduction pipe is connected to a front half air introduction pipe near the opening and a rear half air air near the air cleaner. While being configured with an introduction pipe, a portion between the front half air air introduction pipe and the rear half air air introduction pipe, and the air cleaner, extends along the outside of the one side frame along the outside thereof. The connection was made with the provided sub-atmosphere air introduction pipe.

[0007]

[Operation] In this configuration, the atmospheric air flowing into one side frame flows through the one side frame, and then flows through the opening at one end of the atmospheric air introducing pipe.
After flowing into the first half air air introduction pipe of the atmospheric air introduction pipe, the air air introduction pipe is divided into two paths, a path flowing through the second half air air introduction pipe and a path flowing through the sub-atmosphere air introduction pipe. To flow into the air cleaner.

That is, even if the diameter of the rear-stage atmospheric air introduction pipe of the atmospheric air introduction pipe is set to a size corresponding to a relatively small cross-sectional area at the location of the air cleaner in one of the side frames, it is not necessary to set the diameter to the engine. Atmospheric air does not flow through the latter half air air introduction pipe, but flows separately into both the latter half air air introduction pipe and the sub-atmosphere air introduction pipe. The diameter of the atmospheric air introduction pipe can be greatly reduced as compared with the prior art in which the diameter of the atmospheric air introduction pipe cannot be increased due to the relatively small cross-sectional area at the air cleaner at the side frame.

[0009]

Therefore, according to the present invention, when one of the two side frames of the vehicle is used for a part of the air introduction path, it is possible to prevent the intake resistance from increasing, so that the engine can be prevented. Has the effect of being able to achieve high output.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to 4 show a first embodiment, in which reference numerals 1 and 2 denote a pair of left and right hollow side frames extending in the front-rear direction in a cab-over type automobile. , 2, an engine 3 is mounted in the middle part in the front-rear direction.
A control seat 4 is disposed above the vehicle.

Reference numeral 5 denotes an air cleaner mounted on the upper surface of one of the side frames 1 and 2, and the clean side 5a of the air cleaner 5 is replaced with an intake manifold 6 of the engine 3.
Through an intake pipe 7. In addition, an atmospheric air introduction pipe 8 is inserted into the one side frame 1 so that the atmospheric air introduction pipe 8 extends in the direction of the rear end of the one side frame 1. At one end of 8,
While providing an opening 9 into one side frame 1,
The other end of the atmospheric air introduction pipe 8 is connected to the dust side 5b of the air cleaner 5.

At the front end of the one side frame 1, an air introduction hole (not shown) for introducing atmospheric air into the side frame 1 is provided. The atmospheric air introduction pipe 8 comprises a front half air introduction pipe 8a near the opening 9 and a rear half air introduction pipe 8b near the air cleaner 5. And the latter half air air introducing pipe 8b are connected so as to communicate with each other in a chamber 10 arranged on the outer surface of the one side frame 1, while the chamber 10 and the dust side 5b in the air cleaner 5 are connected. Are connected by a sub-atmosphere air introduction pipe 11 provided outside the one side frame so as to extend along the outside.

In this configuration, the atmospheric air flowing into one side frame 1 from an air introduction hole (not shown)
After flowing in one side frame 1, after flowing into the first half atmospheric air introducing pipe 8 a of the atmospheric air introducing pipe 8 from the opening 9 at one end of the atmospheric air introducing pipe 8,
The latter half of the atmospheric air introducing pipe 8 is the atmospheric air introducing pipe 8b
It flows into the air cleaner 5 separately into two paths, a path flowing through the inside and a path flowing through the sub-atmosphere air introduction pipe 11.

That is, even if the diameter of the rear-stage atmospheric air introducing pipe 8b of the atmospheric air introducing pipe 8 is set to a size corresponding to a relatively small cross-sectional area of the air cleaner 5 in one of the side frames 1. , Engine 3
All of the atmospheric air to the second half of the atmospheric air introduction pipe 8b does not flow through the latter half of the atmospheric air introduction pipe 8b.
b and flows into both the sub-atmosphere air introduction pipe 11 separately, so that the flow resistance of the atmosphere air is reduced by the diameter of the atmosphere air introduction pipe at the location of the air cleaner of the side frame as in the prior art. This can be greatly reduced as compared with the case where the size cannot be increased due to the relatively small cross-sectional area.

In the above embodiment, a chamber 10 is provided between the first half air air introduction pipe 8a and the second half air air introduction pipe 8b in the air air introduction pipe 8, and the space between the chamber 10 and the air cleaner 5 is provided. To the sub-atmosphere air introduction pipe 11
Although the configuration in which the connection is made through the above is shown, in order to achieve the object of the present invention, as shown in FIG. The first half air air inlet pipe 8a and the second half air air inlet pipe 8b are directly connected to each other, and the connection between the air cleaner 5 and the connection part is connected via the sub air air inlet pipe 11. You can.

However, as in the above embodiment, the chamber 10
In the case of using the configuration, since the intake air pulsation in the atmospheric air introduction pipe 8 can be attenuated by the chamber 10, the intake noise can be reduced in addition to increasing the engine output. There are advantages.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 is a side view taken along the line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III of FIG.

FIG. 4 is a diagram schematically showing a first embodiment.

FIG. 5 is a diagram schematically showing a second embodiment.

[Explanation of symbols]

 Reference numerals 1 and 2 Side frame 3 Engine 4 Pilot seat 5 Air cleaner 6 Intake manifold 7 Intake pipeline 8 Atmospheric air introduction pipe 8a First half atmospheric air introduction pipe 8b Second half atmospheric air introduction pipe 9 Opening 10 Chamber 11 Sub-atmosphere air introduction pipe

Claims (1)

(57) [Scope of request for utility model registration] An air cleaner for an engine is provided on an upper surface of a middle portion of one of a pair of left and right hollow side frames extending in the front-rear direction, the air cleaner having an air inlet at one end. The air air introduction pipe to the air cleaner is inserted into the one side frame so that the air air introduction pipe extends in the longitudinal direction of the one side frame. While providing an opening into the side frame,
In an air intake system having the other end connected to the air cleaner, the atmospheric air introduction pipe is constituted by a first half air air introduction pipe near the opening and a second half air air introduction pipe near the air cleaner. A connection between a connection portion between the air air introduction pipe and the rear half air air introduction pipe and the air cleaner is connected by a sub-atmosphere air introduction pipe provided outside the one side frame so as to extend along the outside. An intake device for a vehicle engine.