JP4306939B2 - Air cleaner intake structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air cleaner intake structure in a machine cab in which an engine and an air cleaner are disposed.
[0002]
[Prior art]
First, an air cleaner intake structure to which a conventional technique is applied will be described with reference to FIGS.
FIG. 8 is a side view of a hydraulic excavator to which a conventional air cleaner intake structure is applied, FIG. 9 is a top view of the same, and an imaginary line arrow F in the drawing indicates the flow of air.
[0003]
First, in FIGS. 8 to 9, a lower traveling body 4 is disposed on the hydraulic excavator 2, and an upper swing frame 11 is rotatably mounted at a substantially upper center of the lower traveling body 4. A machine cab 20 is disposed at the rear part of the upper swing frame 11, and a work machine 70 (only one part is shown) is attached to the front part so as to be swingable up and down. In addition, maintenance doors 31 and 32 are disposed on the left side surface of the machine cab 20 so as to be openable and closable, and an intake opening 32 a for an air cleaner is disposed on the rear side of the lower side of the maintenance door 32.
[0004]
Next, FIG. 10 is a partial cross-sectional top view of a main part of a conventional air cleaner intake structure, and FIG. 11 is a side view of the main part of FIG. 10 in which the maintenance door 32 is opened. 10 to 11, the engine 40 is arranged at the approximate center in the machine cab 20, and the gear box 61, the hydraulic pumps 62 and 63, and the air cleaner 47 are arranged at the rear part (the left side in the machine cab 20) of the engine 40. It is installed.
[0005]
A suction pipe 47b attached to the lower inlet of an air cleaner 47 disposed at the rear of the engine 40 and at the upper right side as viewed from the side of the machine cab is connected to the hose 51 laid in the vertical direction on the right side of the machine cab. Connected to the upper end. The lower portion of the hose 51 is L-shaped, and the lower end portion thereof is provided toward the maintenance door 32 and is fitted to the relay pipe 52. Further, the relay pipe 52 is attached to and supported by the lower frame 38 constituting the frame body of the machine cab 20 through the bracket portion 52a. The outer end 52b of the relay pipe 52 is provided so as to face the intake opening 32a of the maintenance door 32, and is attached to the inside of the intake opening 32a of the maintenance door 32 when the maintenance door 32 is closed. The relay box 32 b is inserted into the hole 32 c of the relay box 32 b and the outer periphery of the hole 32 c of the relay box 32 b is sealed through a seal 53.
[0006]
[Problems to be solved by the invention]
However, the air cleaner intake structure according to the above prior art has the following problems.
(1) Since the intake opening 32a is disposed at the lower part of the side surface of the machine cab 20, there are many opportunities to receive mud and muddy water splashed by the lower traveling body 4, and there is a high possibility of inhaling moisture. There are many opportunities to inhale as dust after the mud adhering to the intake opening 32a has dried. In addition, there are many occasions for inhaling rainwater bounced off the upper surface of the lower traveling body 4 as the upper turning frame 11 turns.
(2) In excavation work at a shallow depth of a river or a beach, there is a high possibility of inhaling a wave splash or a strong wind that is stirred by the lower traveling body 4 or the work implement 70. In addition, if the hydraulic excavator 2 tilts during the same operation, the intake opening 32a may be submerged and suck in a large amount of water.
[0007]
The present invention has been made paying attention to the above problems, and an object of the present invention is to provide an air cleaner intake structure that makes it difficult to inhale splashes of rainwater and water splashes on a working water surface.
[0008]
[Means, actions and effects for solving the problems]
In order to achieve the above object, an air cleaner intake structure according to a first aspect of the present invention is an air cleaner intake structure in which intake from the outside of the machine cab is performed on an engine air cleaner disposed inside the machine cab. An air intake opening is provided in the upper side of the air intake, an air intake duct is laid in the upper part of the machine cab at a predetermined height above the air intake opening, and one end of the air intake duct is connected to the upper inlet of the air cleaner. the first intake air introduction port is provided at the other end, it has a second intake air introduction port facing the inlet opening, and has a bottom surface which is inclined upward toward the inside from the second air intake inlet The first intake inlet of the intake duct is communicated with the intake opening at the upper side through an inlet duct.
[0009]
According to the first invention, the following operations and effects can be obtained.
(1) an inlet opening in the upper portion of the side surface of the machine cab and the first intake air introduction port of the air intake duct which is laid at a position higher than the air intake opening, a second intake air opposite to the intake opening has a mouth, and so communicates via an inlet duct having a bottom surface which is inclined upward toward the inside from the second air intake inlet, the rain and water splash that hanging the suction opening inlet duct It is difficult to ascend toward the intake duct, and the water accumulated in the vicinity of the intake opening is easily discharged to the outside due to the inclination of the bottom surface of the inlet duct. Therefore, it is possible to prevent water from flowing into the air cleaner via the intake duct.
(2) By providing the intake opening at the upper part of the side of the machine cab, when working at shallow water depths on rivers and beaches, the intake opening is designed to remove water splashes caused by the lower traveling body and work equipment or water splashes caused by strong winds. Will not suffer in large quantities. In addition, even if the hydraulic excavator is tilted in the same operation, the possibility that the intake opening will be submerged is very small, so that the engine is very unlikely to be seriously damaged. As a result, it is possible to realize a highly versatile air cleaner intake structure that can be used with peace of mind even when working at shallow depths of rivers and beaches.
(3) Since the intake duct is arranged at the upper part inside the machine cab, it does not get in the way when servicing the engine, air cleaner, hydraulic pump, etc. in the machine cab from the side of the machine cab. It can be improved.
[0010]
In a second aspect based on the first aspect, the intake duct is configured integrally with an upper cover of a machine cab.
[0011]
According to the second invention, in addition to the operation and effect of the first invention, when the upper cover of the machine cab is removed, the intake duct is also removed at the same time, so that the maintainability in the machine cab can be greatly improved. The upper cover is reinforced by the intake duct to improve the strength.
[0012]
According to a third aspect, based on the first aspect, the second intake inlet of the inlet duct protrudes outside through the intake opening on the side surface of the machine cab.
[0013]
According to the third invention, in addition to the operation and effect of the first invention, hot air in the machine cab can be more reliably prevented from entering the air cleaner around the second intake inlet of the inlet duct. As a result, engine efficiency can be increased.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments according to the present invention will be described in detail below with reference to FIGS.
[0015]
First, the first embodiment will be described with reference to FIGS.
FIG. 1 is a side view of a hydraulic excavator to which an air cleaner intake structure according to the present invention is applied, and FIG. 2 is a partial sectional side view of the main portion of the present invention. 3 is a cross-sectional view taken along the line AA of FIG. 2, and FIG. 4 is a partial cross-sectional top view of the main part of the present invention. In addition, the same code | symbol is attached | subjected to the component same as FIG.8, FIG10 and FIG.11, and description below is abbreviate | omitted. In addition, virtual line arrows B, C, and D in the figure indicate the flow of air.
[0016]
In FIG. 1, a lower traveling body 4 is disposed in the hydraulic excavator 1, and an upper swing frame 11 is rotatably mounted at a substantially upper center of the lower traveling body 4 via a swing bearing 5. In the upper part of the upper revolving frame 11, a cab 12 is disposed on the left side of the front part, a machine cab 20 is adjacent to the rear side, and a counterweight 13 is adjacent to the rear side of the machine cab 20. Further, maintenance doors 21 and 22 are provided on the left side surface of the machine cab 20 so as to be openable and closable in the left-right direction, and the left and right intake openings 21a are formed on the outer surface of the left maintenance door 21 so as to be elongated to the left and right. Is formed.
[0017]
2 to 4, an inlet duct 23 having an intake inlet 23a opened in the left side direction is attached to a frame 38 provided in the front-rear direction on the upper left side of the machine cab 20 by bolts 38a. The intake duct 23a of the inlet duct 23 faces the intake opening 21a of the maintenance door 21, and an annular seal 23c is affixed to the opening end face of the intake inlet 23a. Thereby, when the maintenance door 21 is closed, the seal 23c comes into contact with the inner surface of the maintenance door 21 at the outer peripheral portion of the intake opening 21a to prevent the intake of hot air in the machine cab 20. . A bottom surface 23d of the inlet duct 23 is inclined slightly upward inward from the intake inlet 23a, and an intake outlet 23b is formed on the upper surface in the vicinity of the inner end, and an annular shape is formed around the intake outlet 23b. The sticker 25 is affixed.
A net 21b is attached to the intake opening 21a.
[0018]
An intake duct 24 is disposed between the intake outlet 23b on the upper surface of the inlet duct 23 and the intake pipe 47a attached to the upper portion of the air cleaner 47 in the vertical direction. The intake air inlet 24 a of the intake duct 24 opens in substantially the same shape as the intake air outlet 23 b of the inlet duct 23, and communicates with the intake air outlet 23 b through the seal 25. Further, the intake pipe 47a above the air cleaner 47 is fitted into the intake outlet 24b of the intake duct 24 through a seal 26 attached to the outer peripheral surface thereof. The intake duct 24 is integrally fixed to the back surface of the upper left cover 27 that covers the upper left side of the machine cab 20, and is attached to the predetermined position by attaching the upper left cover 27 to the frame 38 or the like of the machine cab 20. It is supposed to be fixed.
[0019]
As described above, the following operations and effects can be obtained by the above configuration in FIGS.
(1) Since the intake opening 21a disposed at the upper part of the side surface of the maintenance door 21 is at a high position, in the operation at a shallow water depth of a river or a beach, the splash of water splashed by the lower traveling body 4 and the work implement 70 Or it does not suffer from a large amount of water splash due to strong wind. Even if the hydraulic excavator 1 tilts in a short time during the same operation, the intake opening 21a is less likely to be submerged, and the engine is not seriously damaged.
[0020]
(2) In addition, since the intake direction of the inlet duct 23 changes from the horizontal direction to the upper side, rainwater and water droplets applied to the intake opening 21 a are prevented from flowing into the intake duct 24 by the inlet duct 23. It is easy to be discharged outside by the inclination of the inlet duct bottom surface 23d without accumulating inside. Accordingly, it is possible to prevent rainwater and water splashes from being sucked into the air cleaner 47 from the intake opening 21a.
(3) The inlet duct 23 and the intake opening 21a are flattened in the left-right direction so that the width of the intake duct 23 and the intake opening 21a is almost the same as the width of the maintenance door 21 to widen the intake passage. Thereby, since the flow velocity of the intake air (indicated by phantom lines B and C) passing through the inlet duct 23 is extremely low, the intake air rarely sucks rainwater and water splashes. Accordingly, it is possible to further reduce the amount of rainwater and water droplets that are sucked into the air cleaner 47 from the intake opening 21 a at the upper side of the maintenance door 21.
[0021]
(4) Since the intake duct 24 is disposed at the upper end of the inside of the machine cab 20, it does not become an obstacle when the inside of the machine cab 20 is maintained from the maintenance doors 21 and 22, and the maintainability can be improved.
(5) Since the intake duct 24 is integrally formed with the left upper cover 27, when the left upper cover 27 is removed, the intake duct 24 is also removed at the same time, so that maintenance workability can be improved and the left upper cover 27 Strength can be improved.
[0022]
Next, a second embodiment will be described with reference to FIG. FIG. 5 corresponds to the AA cross-sectional view of FIG. Note that the same components as those in FIG. 3 are denoted by the same reference numerals, the description thereof will be omitted, and the same applies hereinafter.
In FIG. 5, the intake duct 24 is fixed to the inlet duct 23 to form an integral structure. Note that the intake duct 24 may be manufactured integrally including the inlet duct 23. According to the configuration of the present embodiment, no seal material is required between the intake outlet 23b of the inlet duct 23 and the intake inlet 24a of the intake duct 24. Therefore, in addition to the operational effects of the first embodiment, the number of parts is reduced. As a result, durability can be improved and assembly man-hours can be reduced.
[0023]
Next, a third embodiment will be described with reference to FIG. 6 corresponds to a cross-sectional view taken along the line AA in FIG.
In FIG. 6, the inlet duct 23 passes through the intake opening 21 a of the maintenance door 21, and the intake inlet 23 a protrudes to the outside. A net 23e is attached to the intake inlet 23a.
According to the present embodiment, even if there is no seal (corresponding to the seal 23c in FIG. 3) between the intake opening 21a and the intake inlet 23a, hot air in the machine cab 20 enters from the intake inlet 23a. There is no. Therefore, by reducing the number of parts, in addition to the effects of the first embodiment, durability can be improved and manufacturing costs can be reduced.
[0024]
Next, a fourth embodiment will be described with reference to FIG. FIG. 7 corresponds to the AA cross-sectional view of FIG.
In FIG. 7, the side cover 29 formed with the intake opening 29a having a shape and size substantially the same as the intake inlet 23a of the inlet duct 23 is aligned with the outer peripheral portion of the end surface of the intake inlet 23a. The side cover 29 and the inlet duct 23 are integrated. Further, the upper part of the maintenance door 21 is cut out at a portion corresponding to the side cover 29. A net 29b is attached to the intake opening 29a.
According to this embodiment, the same effect as that of the third embodiment can be obtained.
[0025]
As described above, according to the present invention, since the intake opening and the intake inlet to the air cleaner are provided at the upper part of the side surface, the intake inlet receives water droplets on the water surface when working at a shallow depth on a river or beach. Less. In addition, at the inlet (inlet duct) of the intake duct through which the air from the intake inlet first passes, the intake direction is changed from horizontal to upward, and the air is supplied to the next intake duct provided at a predetermined height above the intake inlet. Therefore, it is difficult for rainwater and water droplets collected at the entrance to pass through the upper intake duct and are discharged to the outside by the inclination of the bottom surface of the entrance duct. For this reason, it can suppress that rainwater and water splash enter an upper intake duct by an entrance duct. Furthermore, since the air flow velocity at the time of intake at the intake opening and the inlet duct is reduced to weaken the force for sucking rainwater and water droplets, the amount of rainwater and water splashes can be further reduced. As a result, the work vehicle can be used for a general purpose for working at a shallow depth of a river or a beach.
Further, since the inlet duct and the intake duct are provided at the upper end portion in the machine cab, maintainability inside the machine cab can be greatly improved.
[0026]
Although the above description has been given by taking a hydraulic excavator as an example, the present invention is not limited thereto, and can be widely applied to work vehicles having a configuration in which an engine and an air cleaner are disposed inside a machine cab, and have similar functions and effects. can get.
[Brief description of the drawings]
FIG. 1 is a side view of a hydraulic excavator to which the present invention is applied.
FIG. 2 is a partial cross-sectional side view of a main part of the first embodiment of the present invention.
3 is a cross-sectional view taken along the line AA in FIG.
FIG. 4 is a partial cross-sectional top view of the main part of the first embodiment of the present invention.
FIG. 5 is a cross-sectional view of a main part of the second embodiment, and corresponds to a cross-sectional view taken along the line AA of FIG.
6 is a cross-sectional view of a main part of the third embodiment, and corresponds to a cross-sectional view taken along line AA of FIG.
7 is a cross-sectional view of a main part of the fourth embodiment, and corresponds to a cross-sectional view taken along line AA of FIG.
FIG. 8 is a side view of a hydraulic excavator to which the prior art is applied.
9 is a top view of the excavator of FIG. 8. FIG.
FIG. 10 is a partial cross-sectional top view of the main part of the prior art.
11 is a side view of the main part of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 4 ... Lower traveling body, 11 ... Upper turning frame, 20 ... Machine cab, 21 ... Maintenance door, 21a ... Intake opening, 22 ... Maintenance door, 23 ... Inlet duct, 23a ... Intake inlet, 23b ... Intake outlet, 23c ... Seal, 23d ... Bottom, 24 ... Intake duct, 24a ... Intake inlet, 24b ... Intake outlet, 25 ... Seal, 26 ... Seal, 27 ... Upper left cover, 29 ... Side cover, 29a ... Intake opening, 38 ... Frame, 47 ... Air cleaner, 47a ... Suction pipe.

Claims (3)

In the air cleaner intake structure that intakes air from outside the machine cab (20) to the air cleaner (47) of the engine (40) disposed inside the machine cab (20),
An intake opening (21a) is provided in the upper part of the side of the machine cab (20), and an intake duct (24) is installed in the upper part of the machine cab (20) at a predetermined height higher than the intake opening (21a). One end of the intake duct (24) is connected to the upper inlet of the air cleaner (47), the first intake inlet (24a) is provided on the other end of the intake duct (24), and the intake opening (21a) is provided. a second air intake inlet facing the (23a), and via an inlet duct (23) having a bottom surface (23d) inclined upward toward the inside from the second air intake inlet (23a) the An air cleaner intake structure characterized in that a first intake inlet (24a) of an intake duct (24) is communicated with the intake opening (21a) at an upper side surface. The air cleaner intake structure according to claim 1,
An air cleaner intake structure, wherein the intake duct (24) is integrally formed with an upper cover (27) of a machine cab (20). The air cleaner intake structure according to claim 1,
An air cleaner intake structure characterized in that the second intake inlet (23a ) of the inlet duct (23) protrudes outside through the intake opening (21a) on the side surface of the machine cab (20). .

Images