JP2518776Y2 - Work vehicle engine intake structure - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an intake structure for an engine provided in a work vehicle used in an environment with a relatively large amount of dust such as a combine and a backhoe.

[Conventional technology]

In a combine, which is one of the work vehicles, for example, as disclosed in Japanese Utility Model Publication No. 58-129066 and Japanese Utility Model Publication No. 57-153022, an engine intake is provided in a dust-proof duct for guiding outside air to a radiator. There is one in which an air cleaner is arranged and an intake pipe extending from the air cleaner is connected to the dust-proof duct so as to supply clean air as cold as possible to the air cleaner.

However, since a fan for sucking cooling air is arranged for the radiator to forcibly suck the outside air, even if the dust-proof duct is provided, there is dust that enters the vicinity of the radiator together with the outside air. Therefore, with the above-mentioned conventional structure, since the dust and the like may be sucked into the air cleaner, the air cleaner intake port is separated from the radiator, and the air cleaner intake port is provided on the upper part of the aircraft where dust and the like are rarely scattered. Proposed to be placed.

[Problems to be solved by the device]

As described above, when the air cleaner intake port is arranged in the upper part of the fuselage, the following problems occur. That is, in a reciprocating engine used for a combine or the like, the number of cylinders is small in about 2 or 3 cylinders and the intake stroke of the engine pulsates because the stroke is long. Therefore, this pulsating intake action causes noise that pulsates when the outside air passes through the air cleaner.

And, compared to the lower part of the fuselage that is closer to the ground, noise is more likely to spread in all directions on the upper part of the fuselage, and when the air cleaner intake port is placed on the upper part of the fuselage, the cockpit may be located near the intake port. The intake noise is offensive to the operator.

Therefore, it is possible to reduce the intake pulsation phenomenon by installing an accumulator dedicated to the air cleaner or one having an equivalent function, but there is room for improvement from the structural aspect because a large space for the accumulator is required. It was

An object of the present invention is to make an accumulator for an air cleaner or one having a similar function compact without occupying a large space when the intake port of the air cleaner is arranged at the upper part of the machine body.

[Means for solving the problem]

A feature of the present invention is that the engine intake structure of the work vehicle is configured as follows. That is, the intake pipe is extended from the air cleaner for intake of the engine, the intake port of the intake pipe is exposed, and the intake pipe is covered with an air chamber of a hermetically-sealed structure. In the vicinity of the air chamber, a communication port for communicating the intake pipe and the air chamber is provided, and the intake port of the intake pipe and the air chamber are covered with an intake case having an outside air intake of a dustproof structure. Yes, its action and effect are as follows.

[Action]

With the above-mentioned structure, the pressure accumulating air chamber (11) is formed so as to surround the intake pipe (8) as shown in FIGS. in this way,
The intake pipe (8) and the air chamber (11) have a double structure that allows the intake pipe (8) to pass through the air chamber (11).
The space required for installation is smaller than the separate placement of and.

A relatively wide space is also formed between the outer intake case (13) and the air chamber (11). Thus, when the outside air enters the intake port (8a) of the intake pipe (8) through the outside air intake port (13a) of the intake case (13), the pulsation of the outside air is mitigated.

Further, since the communication port (12) is arranged apart from the intake port (8a) of the intake pipe (8), the air chamber (11) functions as an accumulator, and this air chamber (1
The pulsation in the intake pipe (8) is alleviated by the intake pressure buffering action of 1).

As described above, the pulsation of the outside air drawn into the air cleaner can be suppressed, and the intake noise generated in the air cleaner can be reduced.

[Effect of device]

As described above, by adopting the triple structure of the air chamber as the accumulator covering the intake pipe and the intake case covering the air chamber, the structure for suppressing the pulsation of the intake air to the air cleaner and the noise thereof is made compact as a whole. We were able to.

As a result, the intake pipe and the intake port of the air cleaner having the above-described soundproof structure can be easily arranged on the upper portion of the machine body that is less likely to suck dust and the like.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to the drawings using a combine that is one of the work vehicles.

In the self-removing combine, the control unit (not shown) and the engine (4) are arranged on the right side of the front part of the airframe. As shown in FIGS. 1, 2, and 3, a bonnet (6) covering the engine (4) and the radiator (5) is provided, and a cockpit (7) is provided on the upper surface of the bonnet (6).
Is provided.

Next, in the upper part of the bonnet (6), the cockpit (7)
The structure of the intake system for the engine (4) provided on the rear side will be described in detail. As shown in FIGS. 1, 2, and 3, an intake pipe (8) having an inverted L shape in a front view is provided on the upper surface of the bonnet (6). The intake pipe (8) has a structure in which a pair of half-split pipes are joined together, and is connected to the air cleaner (9) on the engine (4) side via a pipe (10).

An air chamber (11) having a closed structure is attached to the upper surface of the bonnet (6) at the rear side of the cockpit (7) so as to cover the intake pipe (8). In this case, the intake pipe (8) The intake port (8a) is exposed to the outside of the air chamber (11). An intake pipe (8) is provided in the air chamber (11) in the vicinity of the entry portion of the intake pipe (8) into the air chamber (11), that is, in the bonnet (6) side part of the intake pipe (8). A pipe-shaped communication port (12) for communicating with the air chamber (11) is provided.

Further, an intake case (13) is provided on the rear side of the cockpit (7) so as to cover the air chamber (11) and the intake pipe (8), and the rear surface of the intake case (13) (the cockpit (7 (A side opposite to)) is provided with an outside air intake (13a) of a dustproof structure in which a mesh is stretched.

With the above structure, as shown in FIGS. 1 and 2, the outside air that has entered through the outside air intake (13a) on the rear surface of the intake case (13) bypasses the inside of the intake case (13) and the intake port ( 8a) enters the intake pipe (8). The pulsation of the outside air is alleviated to some extent by the bypass action at this time. Then, the pulsation is alleviated by the intake pressure buffering action of the air chamber (11) communicating with the intake pipe (8), and the outside air is drawn into the air cleaner (9).

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 shows an embodiment of an engine intake structure for a work vehicle according to the present invention. FIG. 1 is a vertical cross-sectional rear view near the intake case and the air chamber, and FIG. 2 is a vertical side view near the intake case and the air chamber.
FIG. 3 is an exploded perspective view of the vicinity of the intake case and the air chamber. (8) …… Intake pipe, (8a) …… Intake port of intake pipe, (9) …… Air cleaner, (11) …… Air chamber, (1
2) …… Communication port, (13) …… Intake case, (13a) …… Outside air intake of the intake case.

Claims (1)

(57) [Scope of utility model registration request] 1. An intake pipe (8) which extends from an air cleaner (9) for intake of an engine and exposes an intake port (8a) of the intake pipe (8).
Is covered with an air chamber (11) having a closed structure, and the intake pipe (8) and the air chamber (11) are provided inside the air chamber (11) in the vicinity of the protrusion of the intake pipe (8) into the air chamber (11). ) Is provided with a communication port (12) for communicating with the air intake port (8a) of the intake pipe (8) and the air chamber (11) in an intake case (13) having an outside air intake port (13a) of a dustproof structure. The engine intake structure of the work vehicle that covers and.