JP5967058B2 - Piping material for air cleaner - Google Patents

Description

The present invention relates to a pipe member for an air cleaner for forming a U-turn folded pipe on the outlet side of an air cleaner, for example.

  The background art will be described taking an excavator air cleaner pipe as an example.

  As shown in FIGS. 12 and 13, the excavator has an upper swing body 2 mounted on a crawler-type lower traveling body 1 so as to be rotatable around an axis perpendicular to the ground. A work attachment 9 provided with a boom 3, an arm 4, a bucket 5, and hydraulic cylinders (boom, arm, and bucket cylinders) 6, 7, and 8 for operating them is mounted on the front.

  The upper swing body 2 is configured by providing various devices and equipment on an upper frame 10 as a base.

  That is, an engine room 12 whose upper surface is opened and closed by a bonnet 11 is provided at the rear part of the upper frame. The engine room 12 includes an engine 13 as a power source and related equipment (a radiator 14, a cooling fan 15, a hydraulic pump 16). Etc.) are installed.

  On the other hand, in front of the engine room 12, a cabin 17 is installed on one of the left and right sides (usually on the left side, which will be described below in this case).

  In this specification, “front and rear” and “left and right” refer to the directionality seen from the operator seated in the cabin 17.

  In addition, on the right side of the upper frame 10 (on the side opposite to the cabin 17), a hydraulic oil tank 18 that stores hydraulic oil and a fuel tank 19 that stores fuel are arranged in front of and behind the engine room 12. In FIG. 10, reference numeral 19 a denotes a fuel filler port provided on the upper surface of the fuel tank 19.

  Further, a central scaffold 20 for performing maintenance of the engine room and other equipment in the engine room including the engine 13 is provided in the middle of the upper frame width direction immediately before the engine room 12, and in front of the fuel tank 19, A step-like lifting step 21 for guiding maintenance personnel to the central scaffold 20 is provided.

  On the other hand, as a device for handling fluid, a cylindrical air cleaner 22 for filtering engine intake air is installed in an air cleaner installation space S1 formed between the engine room 12 and the cabin 17 on the left side of the upper frame, for example. The engine 13 (air inlet) is connected by an intake pipe 23 (see Patent Document 1).

  A conventional air cleaner intake pipe structure will be described with reference to FIGS.

  As shown in Patent Document 2, the air cleaner 22 includes a cylindrical main body 24 with a filter built therein, an intake port 25 projecting upward on the outer peripheral surface of the main body 24, and one end of the main body 24. A cylindrical exhaust port 26 is provided on the side, and an intake cylinder 27 is connected to the intake port 25, and an intake pipe 23 is connected to the exhaust port 26.

  A removable end cover 28 for inserting and removing a filter (not shown) is provided on the other end side of the main body 24.

  A in FIG. 15 is a horizontal air cleaner installation surface on which the air cleaner 22 is installed.

  Further, B in FIGS. 15 and 16 is a front restricting surface (for example, the rear surface of the cabin 17) that forms the air cleaner installation space S1, and C is a rear restricting surface (for example, the front surface of the engine room 12).

  In addition, in the situation where the air cleaner 22 is covered with a guard member (not shown), the front surface and the rear surface of the guard member may be a front restriction surface and a rear restriction surface, respectively. In addition, when the air cleaner 22 is attached to the upper surface of the fuel tank via the seat plate, the upper surface of the seat plate becomes the air cleaner installation surface.

  Here, for the air cleaner 22, it is desirable for maintenance and removal (filter removal and insertion) from the central scaffold 20 for work efficiency and safety. Therefore, the end cover 28 usually faces the central scaffold 20 side and the exhaust port 26 faces the opposite side ( Installed facing the outside of the aircraft.

  The intake pipe 23 includes an air cleaner side pipe 29 having one end connected to the exhaust port 26 of the air cleaner 22, and an engine side pipe 30 that connects the air cleaner side pipe 29 and the engine 13 (intake port).

  The air cleaner side pipe 29 is disposed in the air cleaner installation space S1, and the base end side thereof is connected to the air cleaner 22 (exhaust port 26).

  The engine-side piping 30 has a substantially full length portion disposed in the engine room 12, and the tip side thereof is connected to the engine 13 (intake port).

  Further, the air cleaner side pipe 29 is folded in a U-turn shape as shown in the figure because the direction of the exhaust port 26 of the air cleaner 22 which is the connection destination is opposite to the engine side, and one end portion (hereinafter referred to as the following) The base end portion is connected to the exhaust port 26, and the other end portion (hereinafter referred to as the front end portion) is connected to the engine side pipe 30.

  More specifically, the air cleaner side pipe 29 is folded back from the base end portion connected to the exhaust port 26 to the engine side, and a U-shaped folded portion 29a toward the engine side. The air cleaner side pipe 29 forms a U-turn-shaped folded pipe line on the exhaust side of the air cleaner 22.

  As a related technique, a technique for bending a bent pipe compactly while avoiding interference with peripheral members is known by making the cross-sectional shape of the bent pipe (air supply pipe) into a roughly rectangular shape that is long vertically. 3).

Japanese Utility Model Publication No. 63-48965 JP 2003-184670 A Japanese Patent No. 5228069

  According to the conventional intake pipe structure, as shown in FIGS. 13 to 16, the air cleaner 22 is installed in a state where the straight portion 29 b is parallel to the position away from the air cleaner 22. W1 required for this purpose (the front-rear width dimension of the air cleaner 22 and the air cleaner-side pipe 29 combined, hereinafter referred to as “air cleaner front-rear width dimension”) is increased.

  For this reason, it is difficult to assemble the air cleaner 22 in a situation where the longitudinal width dimension of the air cleaner installation space S1 is limited. Alternatively, in order to improve the assemblability, other spaces must be cut to increase the front-rear width dimension of the air cleaner installation space S1.

  Further, it cannot meet the demand for further reducing the air cleaner installation space S1 in order to secure other equipment space.

  If the air cleaner 22 is installed in a state where the exhaust port 26 faces the engine side, the U-turn-like folding itself is not required in the intake pipe 23, so that the front-rear width dimension W1 of the air cleaner can be reduced.

  However, since the end cover 28 faces the outside of the machine body in this way, the maintenance (filter insertion / removal) work must be performed as a high place work from the outside of the machine body, which is not advantageous in terms of safety and work efficiency.

  On the other hand, as a means for reducing the front and rear width dimension W1 of the air cleaner, as shown by a two-dot chain line in FIG. 15, a straight portion 29b of the air cleaner side pipe 29 is formed by the cylindrical surface of the air cleaner outer periphery and the air cleaner installation surface A. It can be considered that the triangular space T (shown by hatching in FIG. 15) is arranged in a state where a part thereof enters.

  However, if the straight portion 29b remains a circular cross section, the amount of entry into the triangular space T is small and the effect of the reduction effect is small.

  Note that if the technique of Patent Document 3 is diverted and the straight portion 29b has a rectangular cross section, it is rather difficult to use the triangular space T as a piping space, and thus a reduction effect cannot be obtained.

  In addition, if the straight portion 29b is a rectangular cross section while the folded portion 29a is a circular cross section, the ventilation resistance increases due to a sudden change in the cross sectional shape and cross sectional area, resulting in a problem that the ventilation performance deteriorates.

  Further, even if the substantially full length portion of the air cleaner side pipe 29 including the folded portion 29a has a rectangular cross section, the base end portion connected to the exhaust port 26 must have a circular cross section, so the problem of ventilation resistance cannot be solved.

  The problems as described above are not limited to the intake pipe of the air cleaner, but are also present in other pipes on the outlet side and inlet side of other equipment that handles air or equipment that handles liquid, and a solution has been awaited.

In view of the above, when the U-turn folded pipe is formed on the outlet side or the inlet side of a device that handles fluid, such as an air cleaner, the present invention is restricted by the peripheral devices and members as described above. It is an object of the present invention to provide a pipe member for an air cleaner that can be piped as compactly as possible in accordance with a limited space while suppressing an increase in resistance.

As means for solving the above problems, the present invention has an outer peripheral surface and a piping member for the air cleaner to form a U-turn shaped folded pipe of the exit side of the air cleaner installed on the air cleaner installation surface , from one end which is connected to an exhaust port provided in the longitudinal direction end side of the air cleaner extends to the outer peripheral side of the air cleaner and the folded portion toward the opposite side of the exhaust port, the folded portion It comprises a linear portion that is integrally connected to the other end side and is disposed along the air cleaner on the air cleaner installation surface, and one end portion of the folded portion has a circular cross-sectional shape corresponding to the exhaust port , straight portion has a non-circular configuration cross-sectional shape to accommodate the regulation by the outer peripheral surface and the air cleaner installation surface of the air cleaner, the folded portion, one end of its Between from to the other end, and has a cross sectional shape gradually changes while maintaining the cross-sectional area substantially constant circular cross-section of the one end portion to set the cross section of the other end portion.

  In this way, by gradually changing the cross-sectional shape from a circular shape to a set shape from one end portion (circular cross-sectional shape) of the folded portion to the other end portion (non-circular set cross-sectional shape) connected to the linear portion, Piping can be made as compactly as possible according to the limited piping space.

In addition, since the cross-sectional shape is gradually changed under the condition that the cross-sectional area is substantially constant, it is possible to suppress an increase in flow resistance due to a sudden shape change.

In the present invention, the folded portion has a shape in which the one end portion opens toward the exhaust port, and the folded portion extends linearly from the one end portion to the outer peripheral side of the air cleaner to reach the straight portion. It is not desirable.

  According to this configuration, since the substantial bent portion is only one place on the folding end side, the flow resistance of the fluid can be minimized.

In the present invention, setting the cross-sectional shape of the straight line portion with a horizontal the air cleaner installation surface, the inclined oblique portion so as to enter the triangular space defined by the cylindrical surface constituting the outer peripheral surface of the air cleaner it is not desirable is a roughly triangular.

  For example, in the situation like the air cleaner side pipe of the air cleaner intake pipe described in the background art, the front-rear width dimension of the apparatus can be greatly reduced.

  Further, the triangular space is a space that is originally a dead space, and since this dead space is used as a part of the piping space of the straight portion, the space utilization efficiency is improved.

In addition, the triangular space, because it is formed obliquely below the device when viewed from the side, a part is hidden by the d Akurina exposed portion of the straight portion as viewed from above is reduced, efficiency of use of space Especially good.

In this case, setting the cross-sectional shape of the straight line portion, the side portions adjacent to the oblique side is not to that a third generally right-angled triangle along the regulating surface of the rising substantially perpendicular desired for the air cleaner installation surface .

  By doing so, the cross-sectional shape of the straight line portion becomes closer to a triangle (right triangle), and the width direction of the front and rear of the air cleaner can be further reduced. For this reason, in the situation where a straight line part is arranged at a corner part formed by two substantially orthogonal restriction surfaces including an air cleaner installation surface, the straight line part can be arranged compactly and without difficulty.

Further, in the present invention, the cross-sectional shape of the folded portion, as to adapt to regulation by a guard member disposed proximate the outer surface of said folded portion, of the outer surface has a shape along said guard member Nozomu better not.

  If it carries out like this, even if the outer surface of a folding | returning part is controlled by the guard member and a guard member cannot be expanded, it can pipe compactly, avoiding interference with a guard member.

Cleaner pipe member according to the present invention, the back portion and the straight portion has to desired be composed as a molded article which integrally continuous.

  By configuring the entire piping member as an integrally molded product (for example, a plastic injection molded product) in this way, the front and rear width dimensions of the air cleaner can be reduced to a minimum without difficulty.

  In addition, since the protrusion of the folded portion in the length direction of the air cleaner can be minimized, it is advantageous when space is restricted in the length direction of the air cleaner.

According to the present invention, conditions a cleaner pipe member to form a U-turn shaped folded pipe of the outlet side of the Eakuri Na, and other equipment, piping space regulated by members is limited In the air cleaner piping member used below, it is possible to perform piping as compactly as possible in accordance with the limited space while suppressing an increase in fluid flow resistance.

It is a perspective view of the upper revolving body of the shovel equipped with the air cleaner in which the piping member according to the embodiment of the present invention is used. FIG. It is a perspective view which shows an air cleaner and its intake piping. FIG. FIG. FIG. FIG. FIG. 6 is an enlarged sectional view taken along line VIII-VIII. It is a perspective view of a piping member concerning an embodiment of the present invention. FIG. (a)-(f) is each sectional drawing of the aa line of FIG. 10, bb line, cc line, dd line, ee line, and ff line. It is a schematic side view of an excavator. It is a schematic plan view of the shovel which shows a prior art. It is a perspective view which shows the conventional air cleaner and its intake piping. FIG. FIG.

  An embodiment of the present invention will be described with reference to FIGS.

  The embodiment is applied to an excavator air cleaner pipe.

  In the embodiment, the following points regarding the excavator configuration and the like are the same as those of the prior art shown in FIGS.

  (i) The upper turning body 2 is mounted on a lower traveling body (not shown) so as to be turnable around an axis perpendicular to the ground.

  (ii) The upper swing body 2 is configured by providing various devices and equipment on an upper frame 10 as a base.

  (ii) An engine room 12 that is opened and closed by a bonnet 11 is provided at the rear of the upper frame 10, and an engine 13 as a power source and related equipment (a radiator 14, a cooling fan 15, a hydraulic pump 16) are provided in the engine room 12. Etc.) is installed.

  (iii) The cabin 17 is installed on the left side in front of the engine room 12.

  (iv) On the opposite side (right side) of the upper frame 10 to the cabin 17, a hydraulic oil tank 18 that stores hydraulic oil is installed in front of the engine room 12.

  (v) A central scaffold 20 for maintaining the engine 13 and other equipment in the engine room is provided at an intermediate portion in the upper frame width direction immediately before the engine room 12.

  (vi) A step-like elevating step 21 for guiding maintenance personnel to the central scaffold 20 is provided in front of the hydraulic oil tank 18.

  In the embodiment, a fuel tank 19 for storing fuel is installed in an installation space S <b> 2 formed between the cabin 17 and the engine room 12 in the upper frame 10, and an air cleaner that filters engine intake air on the fuel tank 19. 22 is arranged.

  In other words, the hydraulic oil and fuel tanks 18 and 19 that are arranged side by side on the right side of the upper frame in the prior art shown in FIG. 13 are arranged separately on the upper frame 10 in the embodiment, and the air cleaner 22 is provided. It is arranged on the fuel tank 19 so as to overlap (three-dimensional arrangement).

  As a result, an empty space is created in front of the hydraulic oil tank 18, that is, below the elevating step 21, and other equipment (for example, a liquid reducing agent tank, a battery for a hybrid machine, or both) is installed here. It is configured to be able to.

  The air cleaner 22 is installed on the rear part (near the engine room) on the fuel tank 19 while avoiding the fuel filler opening 19a provided in the front part.

  The structure of the air cleaner 22 itself is the same as that of the prior art shown in FIGS.

  That is, as shown in detail in FIGS. 3 to 8, the air cleaner 22 includes a cylindrical main body 24 in which a filter (not shown) is installed, an intake port 25 projecting upward on the outer peripheral surface of the main body 24, and a main body. 24 has an exhaust port (connection port of claim 1) provided on one end side, and an intake cylinder 27 is connected to the intake port 25, and an intake pipe 31 is connected to the exhaust port 26.

  A removable end cover 28 for inserting and removing a filter (not shown) is provided on the other end side of the main body 24.

  4, 5, 7, 8 is a horizontal air cleaner installation surface on which the air cleaner 22 is installed. When the air cleaner 22 is directly mounted on the fuel tank 19 as shown in FIG. 4, the upper surface of the fuel tank, the seat plate In the case of mounting via the bracket, the upper surface of the bracket becomes the air cleaner installation surface A.

  5, 6, and 8, B stands at a right angle with respect to the air cleaner installation surface A to restrict the position of the air cleaner 22 from the front (for example, the rear surface of the cabin 17), and C denotes the air cleaner installation surface A. The air cleaner 22 rises and falls back and forth by both restriction surfaces B and C on the rear restriction surface (the “third restriction surface” in claim 5, for example, the front surface of the engine room 12). It is installed in a position-controlled state.

  In addition, in the situation where the air cleaner 22 is covered with the guard member G (indicated by a two-dot chain line in FIG. 4), the front surface and the rear surface of the guard member G may be a front restriction surface and a rear restriction surface, respectively.

  Since it is desirable for the air cleaner 22 to perform maintenance (inserting / removing the filter) from the central scaffold 20 for work efficiency and safety, the end cover 28 faces the central scaffold 20 side and the exhaust port 26 is on the opposite side (outside the fuselage) as before. ).

  The intake pipe 31 includes an air cleaner side pipe 32 having one end connected to the exhaust port 26 of the air cleaner 22, and an engine side pipe 33 that connects the air cleaner side pipe 32 and the engine 13 (intake port).

  The air cleaner side pipe 32 is disposed in the installation space S2, and the base end side thereof is connected to the air cleaner 22 (exhaust port 26).

  The engine-side pipe 33 has a substantially full length portion disposed in the engine room 12, and the tip side thereof is connected to the engine 13 (intake port).

  Further, the air cleaner side pipe 32 is folded in a U-turn shape as shown in the figure because the direction of the exhaust port 26 of the air cleaner 22 that is the connection destination is opposite to the engine side, and one end portion (hereinafter referred to as the following) The base end portion is connected to the exhaust port 26, and the other end portion (hereinafter referred to as the front end portion) is connected to the engine side pipe 33.

  More specifically, the air cleaner side pipe 32 extends from the base end portion connected to the exhaust port 26 to the outer periphery of the air cleaner and turns toward the engine side, and the engine 13 ( The air cleaner side pipe 32 forms a U-turn-like folded pipe line on the exhaust side of the air cleaner 22.

  As shown in FIG. 8, the straight portion 32 b of the air cleaner side pipe 32 includes a horizontal base portion X, a hypotenuse portion Y, and a vertical side portion Z in a sectional view, and corners between the side portions are rounded. It is formed in a generally right-angled triangle.

This straight portion 32b is
(I) In the corner portion formed obliquely below when the air cleaner 22 is viewed from the side surface by the air cleaner installation surface A and the rear regulating surface C,
(II) The hypotenuse Y enters the triangular space T (shown by hatching in FIG. 8) formed by the outer peripheral surface (cylindrical surface) of the air cleaner body 24 and the horizontal air cleaner installation surface A.
(III) The vertical side Z is close to (or touches) the rear regulating surface C.
Arranged in a state.

  Here, since the exhaust port 26 of the air cleaner 22 has a circular cross section, the base end portion 32a1 (only the reference numerals in FIGS. 9 and 10) of the folded portion 32a connected to the exhaust port 26 are provided on the exhaust port 26. On the other hand, the tip portion connected to the straight portion 32b needs to be matched with the cross-sectional shape (substantially a right triangle) of the straight portion 32b shown in FIG.

  In this case, in the folded portion 32a, the ventilation resistance is originally increased by the folding (bending) of the pipe line, and if the cross-sectional shape is changed from a circle to a right triangle at once and with a large cross-sectional area reduction, the ventilation resistance is further increased. There is a negative effect of increasing the air supply performance.

  Therefore, the folded portion 32a gradually changes from a circular shape to a substantially right triangle that is the same as the straight portion 32b under the condition that the cross-sectional area is substantially constant between the proximal end portion 32a1 and the distal end portion. .

  Note that the “substantially constant” cross-sectional area is a concept that includes the most desirable and completely the same, as well as some increase / decrease and variation due to the forming limit of the folded portion 32a.

  Further, the folded portion 32a is not a simple arc-shaped bent shape as in the prior art, but a base end portion 32a1 opens toward the exhaust port 26 as shown in the figure, and linearly extends from the base end portion toward the outer periphery of the air cleaner. And is formed in a shape reaching the straight portion 32b.

  In FIG. 9, 32 b 1 is a tip portion of a straight portion 32 b, and this straight portion tip portion 32 b 1 has a circular cross section in accordance with the engine side pipe 33 having a circular cross section. That is, the tip side of the straight portion 32b has a gentle curve and low ventilation resistance, so that the cross-sectional shape changes directly from a generally triangular shape to a circular shape.

  On the other hand, the folded portion 32a is also restricted by a guard member G (see FIGS. 4 and 11) that covers the entire air cleaner 22.

  For example, if the guard member G is provided on the front surface side, the guard member G is provided so as to be openable and closable (may be detachable) by a hinge (not shown).

  As shown in FIG. 11, the left side surface portion G1 of the guard member G has, for example, a gently curved upper portion and a straight lower portion, and is disposed close to the outer surface of the folded portion 32a. There is a possibility of interfering with 32a.

Therefore, in the embodiment, the cross-sectional shape of the folded portion 32a is
i) Four restrictions by the air cleaner installation surface (first restriction surface) A, the cylindrical surface (second restriction surface) of the outer periphery of the air cleaner, the rear restriction surface (third restriction surface) C, and the left side surface portion G1 of the guard member G Adapted to
ii) It changes under the condition that the cross-sectional area is kept almost constant.

  11A shows the cross-sectional shape (circular shape) of the folded portion base end portion 32a1, and from here to the intermediate portion [FIGS. 11B to 11D], the outer surface is the left side of the guard member. While maintaining the shape along the surface portion G1 and adjusting the cross-sectional area to be substantially constant, the inner surface partially swells (a in FIGS. 11C and 11D is this swelled portion). The cross-sectional shape is deformed while being added.

  In the vicinity of the tip [FIG. 11 (e)], the original shape of a right triangle is formed, and at the tip [(FIG. 11 (f)]), the final cross-sectional shape is the base X, the hypotenuse Y, and the vertical side Z. It becomes a triangle.

  Such an air cleaner side pipe 32 can be configured as a molded product in which the folded portion 32a and the linear portion 32b are integrally continuous by injection molding using plastic or rubber as a raw material.

  Or it is also possible to shape | mold by casting using a metal material.

  According to the above configuration, the following effects can be obtained.

  (1) By gradually changing the cross-sectional shape from a circular shape to a set shape (generally a right-angled triangle) from the base end portion of the folded portion 32a to the tip end portion connected to the straight portion 32b, it is adapted to the restricted piping space. And can be piped as compact as possible.

  That is, the front and rear width dimension W2 (see FIGS. 6 and 8) of the air cleaner can be reduced, and piping can be easily performed in the limited air cleaner installation space S2.

  (2) The cross-sectional shape of the straight portion 32b is roughly provided with an oblique side Y that enters the triangular space T formed by the air cleaner installation surface A and the cylindrical surface on the outer periphery of the air cleaner, and a vertical side Z that extends along the rear regulating surface C. Since it is a right-angled triangle, the straight portion 32b can be inserted deeper into the triangular space T, and the protrusion allowance α (see FIG. 8) when the air cleaner 22 is viewed from above can be reduced. For this reason, the air cleaner front-rear width dimension W2 can be reduced to the minimum.

  Thereby, the linear part 32b can be arrange | positioned compactly and reasonably in the condition which arrange | positions the linear part 32b in the corner part formed with the air cleaner installation surface A and the back control surface C like embodiment.

  (3) The triangular space T is originally a space that becomes a dead space. Since this dead space is used as a part of the piping space of the straight portion 32b, the space utilization efficiency is improved.

  (4) Since the triangular space T is formed obliquely below the air cleaner 22 when viewed from the side, a part of the linear portion 32b is hidden under the air cleaner 22 when viewed from above, and the exposed portion is reduced. Use efficiency is particularly good.

  (5) Since the cross-sectional shape of the folded-back portion 32a is gradually changed under the condition that the cross-sectional area is substantially constant, an increase in ventilation resistance due to a sudden shape change can be suppressed.

  (6) Since the folded portion 32a has a base end portion that opens toward the exhaust port 26 and extends linearly from the base end portion to the outer peripheral side of the air cleaner to reach the straight portion 32b, a substantially bent portion Is only one place on the folding end side. For this reason, ventilation resistance can be minimized.

  (7) The cross-sectional shape of the folded portion 32a is adapted to be regulated by the guard member G disposed close to the outer surface of the folded portion 32a, and the outer surface is shaped along the guard member G (left side portion G1). Therefore, even in a situation where the guard member G cannot be expanded, the piping can be made compact while avoiding interference with the guard member G.

  (8) Since the folded portion 32a and the linear portion 32b are formed as a integrally formed molded product (for example, a plastic injection molded product), the air cleaner front-rear width dimension W2 can be reduced to a minimum without difficulty. it can.

  Further, since the protrusion β (see FIG. 6) in the air cleaner length direction of the folded portion 32a can be reduced to the minimum, it is advantageous when the space is restricted in the air cleaner length direction.

Other embodiments
(A) The cross-sectional shape of the straight portion 32b may be a substantially triangular shape in which the vertical side portion Z of the above embodiment is an arc shape.

  Even in this case, by arranging the straight portion 32b in a state where the oblique side Y enters the triangular space T, the air cleaner longitudinal width W2 can be basically reduced.

  (B) The cross-sectional shape (set cross-sectional shape) of the straight line portion 32b is not limited to a generally triangular shape, and can be variously selected according to the type, number, shape, and the like of the restriction surface. For example, a trapezoidal shape, an ellipse shape, a rhombus shape, a polygon shape having four or more squares, or a combination of a plurality of shapes may be used.

  (C) In the above embodiment, the case where the air cleaner 22 is installed with the upper surface of the fuel tank 19 as the air cleaner installation surface A is illustrated, but the air cleaner 22 may be installed with the upper surface of the hydraulic oil tank 18 or the upper frame as the air cleaner installation surface. Good.

  Or you may take the structure which suspends the air cleaner 22 in the set installation space.

  (D) The present invention is not limited to an intake pipe (air cleaner side pipe) for an air cleaner, and is configured by diverting an excavator, not limited to an excavator, as a piping member on the outlet side or the inlet side of equipment that handles fluids widely. The same can be applied to various construction machines.

12 Engine room forming an air cleaner installation space 17 Same as above, Cabin 19 Fuel tank in which an air cleaner is installed S2 Air cleaner installation space 22 Air cleaner (device for handling fluid)
24 Air cleaner body 26 Exhaust port (connection port)
31 Intake piping 32 Air cleaner side piping as a piping member 32a Folded portion 32a1 Base end portion of the folded portion 32b Straight portion 32b1 Tip portion of the straight portion X Bottom portion that forms a substantially right-angled cross section of the straight portion Y Same, oblique side Z Same , Vertical side 33 Engine side piping A Air cleaner installation surface B Front restricting surface C Rear restricting surface G Guard member G1 Guard member left side portion T Triangular space

Claims (6)

Has an outer peripheral surface and a piping member for the air cleaner to form a U-turn shaped folded pipe of the exit side of the air cleaner installed on the air cleaner installation surface,
A folded portion extending from one end connected to an exhaust port provided on one end side in the lengthwise direction of the air cleaner to the outer peripheral side of the air cleaner and having the other end facing away from the exhaust port ; is integrally connected to the end side consists of a straight portion that is disposed along the air cleaner on the air cleaner installation surface, one end of the folded portion has a circular cross-sectional shape corresponding to the exhaust port, the straight line portion has a non-circular configuration cross-sectional shape to accommodate the regulation by the outer peripheral surface and the air cleaner installation surface of the air cleaner, the folded portion is between from one end of its to the other end, substantially the cross-sectional area A pipe member for an air cleaner , characterized by having a cross-sectional shape that gradually changes from a circular cross section of the one end to a set cross section of the other end while keeping constant. The folded portion has a shape in which the one end portion opens toward the exhaust port, and the folded portion extends linearly from the one end portion to the outer peripheral side of the air cleaner to reach the straight portion. The air cleaner piping member according to claim 1. Setting the cross-sectional shape of the straight line portions, it and horizontal the air cleaner installation surface, a generally triangular with inclined oblique portion so as to enter the triangular space defined by the cylindrical surface constituting the outer peripheral surface of the air cleaner The piping member for an air cleaner according to claim 1 or 2. Setting the cross-sectional shape of the straight line portion, the side portions adjacent to the oblique side is, according to claim 3, characterized in that the third approximately right triangle along the regulating surface of the rising substantially perpendicular to the air cleaner installation surface The piping member for air cleaners of description. The cross-sectional shape of the folded portion, as to adapt to regulation by a guard member disposed proximate to the outer surface of the folded part, according to claim 1 in which the outer surface, characterized in that a shape along said guard member The piping member for an air cleaner according to any one of 4 . The piping member for an air cleaner according to any one of claims 1 to 5 , wherein the folded portion and the straight portion are configured as a molded product that is integrally continuous.

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