JPH10318056A - Intake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure a work space so as to improve workability, in a manufacturing and an installing working while collecting intake parts. SOLUTION: An intake device is provided with a cleaner case 3 capable of housing a filer element 2, a throttle body 4 to which air passed the cleaner case 3 is led, and an intake pipe 5 from which air passed the throttle body 4 is led to an engine side. The cleaner case 3 is provided with a case bottom part 12 formed integratedly with at least one part 14 in the intake pipe 5, a case intermediate part 13 which is detachably assembled with the case bottom part 12 and in which the filter element 2 is housed, and a case lid part 11 which is detachably assembled with the case intermediate part 13 and which is arranged for sealing the opening part of the cleaner case 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake system in which a plurality of components provided in an intake system of an engine are integrated.

[0002]

2. Description of the Related Art As an intake device for an automobile engine, Japanese Patent Application Laid-Open No. 8-334070 discloses a device in which an air cleaner and an intake pipe are integrally formed of resin to reduce the number of parts and the installation space. Have been.

[0003]

SUMMARY OF THE INVENTION
Compared to single components such as a cleaner case and an intake pipe which have been separately formed up to now, the structure becomes complicated and large due to the aggregation of these components. Therefore, considerable consideration is required for the manufacture of the device and its mounting operation.

[0004] It is an object of the present invention to provide an air intake device in which inconveniences related to the manufacture and mounting of the air intake system components are eliminated while the intake system components are consolidated.

[0005]

Hereinafter, the present invention will be described with reference to the drawings showing embodiments of the present invention. However, the present invention is not limited to the illustrated embodiment.

According to the first aspect of the present invention, there is provided a cleaner case (3) capable of accommodating the filter element (2), a throttle body (4) into which air passing through the cleaner case (3) is guided, and a throttle body (4). And an intake pipe (5) for guiding the air passing through the intake pipe to the engine side, and the cleaner case (3) includes at least a part (1) of the intake pipe (5).
A case bottom part (12) integrally formed with the case bottom part (4), a case middle part (13) removably combined with the case bottom part (12), and a filter element (2) is housed inside; The above-mentioned problem is solved by an intake device (1) having a case lid (11) removably combined with an intermediate portion (13) and closing an opening of a cleaner case (3).

According to the present invention, only the case bottom (12) is formed integrally with the intake pipe (5). Therefore, when the intake pipe (5) is mounted on the engine (E), the case middle (13) is used. The upper part can also be separated to secure a sufficient working space around the intake pipe (5).

According to a second aspect of the present invention, in the intake device of the first aspect, the intake pipe (5) has an upper wall (14) formed integrally with the case bottom (12), and the upper wall (14). ) Is formed in a tubular shape by joining a lower wall portion (15) separately formed in the radial direction of the intake pipe (5). Therefore, the case bottom (12) and the upper wall (14) of the intake pipe (5) are integrated in a relatively simple shape, and they can be easily formed.

According to a third aspect of the present invention, in the intake device of the first aspect, a flange (17) for attaching to the engine (E) is provided at an end of the intake pipe (5), and a side wall (12) of the case bottom (12) is provided. The recess (123) is aligned with a bolt hole (171) provided in the mounting flange (17).
Is provided. According to the present invention, the insertion space for the work tool for tightening the bolt is secured by the recess (123), and the case bottom (1) is secured.
The installation work of the intake pipe (5) can be performed without being obstructed by 2).

According to a fourth aspect of the present invention, in the intake device of the first aspect, the throttle body (4) is provided at an intermediate portion (1).
It is characterized in that it is sandwiched and held between 3) and the intake pipe (5). According to the present invention, the case middle portion (13)
The throttle body (4) can be assembled in parallel with the work of assembling the case bottom (12).

According to a fifth aspect of the present invention, there is provided a cleaner case (33) capable of accommodating the filter element (32), a throttle body (34) into which air passing through the cleaner case (33) is guided, and a throttle body (34). An intake pipe (35) for guiding the air passing through to the engine (E) side;
The suction pipe (35) is provided with a cleaner case (33).
A first half (36) formed integrally with the bottom (40) of the
The above is described above with the intake device (31) configured by joining the bottom portion (40) of the cleaner case (33) and the rear half portion (37) formed separately in the longitudinal direction of the intake pipe (35).
According to the present invention, the joining portion between the first half (36) and the second half (37) of the intake pipe (35) can be limited to a part of the entire length of the intake pipe (35), and the quality of the connection therebetween is reduced. (35)
The effect on the strength of the sheet can be suppressed.

According to a sixth aspect of the present invention, in the intake device of the fifth aspect, a cleaner case (33) is provided in the front half (36) of the intake pipe (35) such that an upper end thereof is opened inside the cleaner case (33). An assembly (35a) is formed integrally with the bottom (40) of the assembly (33), and the assembly (35a)
The opening at the top of the bottom is the bottom (40) of the cleaner case (33).
The intake pipe (35) branches off from the collecting part (35a) to each cylinder of the engine (E) while being sealed by a lid part (43) welded to the engine. According to the present invention, the core (62) of the mold for molding the collecting portion (35a) is integrally formed with the main mold (60) for molding the bottom (40) of the cleaner case (33). The core (62) can be stabilized. Therefore, the slide (63) for forming the branch portion (35b) of the intake pipe (35) and the core (62) can be accurately positioned to prevent burrs on the inner surface of the intake pipe (35). Since the core (62) for the collecting part (35a) can be pulled upward, the size of the collecting part (35a) is not limited by the flow paths before and after the collecting part (35a).

According to a seventh aspect of the present invention, in the intake device according to the fifth aspect, the first half (36) is inserted into the second half (37) at the junction with the second half (37). A projection (36a) for eliminating a step on the inner surface of the intake pipe (35) is provided. According to the present invention, the rear portion (3) is formed by the projection (36a).
7) covers the space formed near the entrance of the intake pipe (3).
The air stagnation portion is eliminated from the inside of 5), thereby preventing the occurrence of turbulence and smoothly introducing air from the intake pipe (35) to the engine (E).

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

-First Embodiment- FIG. 1 is a simplified perspective view showing an intake device according to a first embodiment of the present invention, and FIG. 2 is a sectional view of the intake device. As shown in these drawings, the intake device 1 includes a cleaner case 3 for accommodating a filter element 2, a throttle body 4 for adjusting an intake air amount, and a suction port of an engine E (see FIG. 2). And an intake pipe 5 for guiding intake air. Although the intake device 1 is intended for a three-cylinder engine, the present invention can be applied to other numbers of cylinders.

The cleaner case 3 has a case main body 10 and a case lid 11, and the case main body 10 is formed by vertically combining a resin bottom part 12 and a resin middle part 13 similarly. ing. The filter element 2 is held inside the case middle part 13 (see FIG. 2).

An outside air inlet 121 is formed in a side wall 120 of the case bottom 12. As shown by the arrow in FIG. 2, the air flowing into the primary chamber C1 in the case bottom 12 from the outside air inlet 121 passes through the filter element 2 from the bottom to the top, and the secondary air formed in the lid 11 is formed. The chamber C3 flows into the chamber C2, and is formed next to the secondary chamber C2.
And flows through the internal flow path 4a of the throttle body 4 at a flow rate corresponding to the opening degree of the valve 4b, flows into the collecting part 5a of the intake pipe 5, and from the collecting part 5a via the branch part 5b. It is sucked into each cylinder (not shown) of the engine E.

Next, each part of the apparatus will be described in detail. 3 to 5 show details of the case bottom 12. The case bottom 12 has a bottom plate 122 in addition to the side wall 120 and the outside air inlet 121 described above. The bottom wall 122 is formed integrally with the upper wall portion 14 of the intake pipe 5. The intake pipe 5 is formed by dividing the upper and lower wall portions 14 and 15 that are formed separately from a parting line PL (shown by a thick line in FIG. 4) extending in the longitudinal direction thereof.
Are joined in the radial direction to form a tube.

The case bottom 12 and the upper and lower walls 14, 15 are
It is manufactured by injection molding using resin as a material. The upper wall portion 14 of the intake pipe 5 is formed such that a part of the wall thereof is exposed in the primary chamber C1 of the case bottom portion 12. According to such a configuration, the overall height of the intake device 1 can be made smaller than when the cleaner case 3 is provided separately above the intake pipe 5. A flange 16 for attaching the throttle body 4 is integrally formed at one end of the upper wall portion 14 of the intake pipe 5 (an end portion on the gathering portion 5a side).

At the joint between the upper wall portion 14 and the lower wall portion 15 of the intake pipe 5, a joining flange 140 is formed along a parting line PL.
150 are formed respectively. As shown in FIG.
The joining flange 140 has a concave portion 141, and the joining flange 1
Each of the projections 50 has a projection 151. By vibrating the upper and lower wall portions 14 and 15 in a state where these concave portions 141 and convex portions 151 are combined, the upper and lower wall portions 14 and 15 are vibrated.
5 are joined together. The upper and lower wall portions 14 and 15 may be joined using not only the vibration welding but also another welding method.

As shown in FIGS. 6 and 7, the lower wall 15
Is integrally formed with a flange 17 for connection to the engine E. An opening 170 for the fuel injection device is formed in the flange 17, and a bolt hole 171 for fixing the flange 17 to the engine E is formed.
As shown in FIG. 3, on the side wall 120 of the case bottom 12,
A recess 123 is provided in alignment with the bolt hole 171. Due to the recess 123, a work tool (for example, a hexagon wrench) for tightening a bolt can be engaged with a bolt (not shown) in the bolt hole 171 without being disturbed by the case bottom 12.

FIGS. 9 to 11 show the case intermediate portion 13 of the cleaner case 3. FIG. The case middle part 13 is a filter holding part 1 for accommodating the filter element 2.
30 and a throttle holding portion 131 for mounting the throttle body 4 (see FIG. 2). The filter holding unit 130 is mainly configured by a rectangular holding frame 130a, and flanges 132a and 132b are provided on upper and lower outer peripheries of the holding frame 130a, respectively.

The lower end flange 132b is provided with a projection 132c corresponding to the concave portion 123 of the case bottom 12, but the holding frame 130a and the upper end flange 132a have no such projection. . As a result, a substantially rectangular parallelepiped accommodation space is secured inside the filter holding portion 130, so that it is not necessary to design the filter element 2 as a dedicated product deformed in accordance with the concave portion 123.

A plurality of mounting claws 133 are provided on the outer periphery of the lower end of the filter holding section 130. As shown in FIG. 12, a flange 124 is formed at the upper end of the case bottom portion 12, and a plurality of thick portions 125 are provided on the lower surface side of the flange 124 corresponding to the mounting claws 133. The formation position of the thick portion 125 is shown by a hatched area in FIG. The case bottom part 12 and the case middle part 13 are mutually connected by putting the filter holding part 130 of the case middle part 13 on the case bottom part 12 and hooking the attachment claw 133 on the thick part 125. At the time of this connection, the case bottom 12
Flange 124 of the case middle portion 13
The packing 18 is inserted between the packing 18 and b.

As shown in FIGS. 9 and 10, the throttle holding portion 131 is provided with a bottom plate 134,
4 is provided with a fitting cylinder 135. As shown in FIG. 13, a fitting shaft portion 4 at the upper end of the throttle body 4 is attached to the fitting cylinder 135 from below by way of an elastic member 19 such as rubber.
c is inserted. The hose band 20 is attached to the outer periphery of the fitting cylinder 135. When the hose band 20 is tightened, the fitting cylinder 135 contracts while narrowing the slit 135a, so that the throttle body 4 and the fitting cylinder 135 are air-tightly joined.

As described above, since the cleaner case 3 is formed by being divided into the case bottom portion 12 and the case middle portion 13, the throttle body 4 is mounted on the flange 16 on the case bottom portion 12 side, and then the case middle portion 13 is formed. While the throttle body 4 is fitted to the case bottom 12 and the fitting cylinder 135.
And can be connected. When fixing the flange 17 of the intake pipe 5 to the engine E, a large working space can be secured around the flange 17 by removing the case intermediate portion 13.

A groove 136 is formed on the outer circumference of the throttle holding portion 131 over the entire circumference. In addition, a breather connection tube 137 is provided on the bottom plate 134 of the throttle holding portion 131 in line with the fitting tube 135, and a gutter 138 is provided from the breather connection tube 137 to the fitting tube 135. These uses are described below.

FIGS. 14 to 17 show the lid 11 of the cleaner case 3. The lid 11 is made of resin, and a flange 110 is formed on the outer periphery of the lid 11 so as to cover the outer periphery of the case intermediate portion 13 over the entire periphery. As described above, the secondary chamber C2 and the chamber C3 are respectively formed inside the lid portion 11, and the volume of the chamber C3 is reduced.
In order to enlarge it more than 2, the top plate 111 of the lid 11 is inclined so as to have an upward gradient from the secondary chamber C2 side to the chamber C3 side. At the boundary position between the secondary chamber C2 and the chamber C3, three ribs 112 hang down from the top plate 111, and a leg plate 113 is provided at the lower end thereof over the entire length of the lid 11 in the width direction (vertical direction in FIG. 15). Is provided.

As shown in FIG. 2, packings 21 and 22 are respectively mounted on the flange 132a and the groove 136 of the case intermediate portion 13, and the flange 110 of the lid 11 is covered from above. At the boundary position between the filter holding part 130 and the throttle holding part 131 of the case middle part 13, the packings 21 and 22 are pressed down by the leg plates 113 of the lid 11. The packing 21
Is attached to the outer periphery of the filter element 2.

A partition tube 114 is provided on the inner surface side of the lid portion 11. As shown in FIG. 18, the partition tube 114 is fitted to the outside of the breather connection tube 137 of the case intermediate portion 13 with the attachment of the lid portion 11. Thereby, the lid 11
Inside the breather chamber C partitioned from the chamber C3
5 are formed. The breather connection cylinder 137 protrudes downward through the bottom plate 134 of the throttle holding portion 131 of the case intermediate portion 13, and an oil breather hose (not shown) is connected to a lower end thereof. As indicated by arrows in FIG. 18, air containing oil droplets OL is supplied to the breather chamber C5 from the oil breather hose via the breather connection tube 137, and the oil droplets OL drop onto the bottom of the breather chamber C5. Gutter part 1
It is led into the throttle body 4 from 38.

As shown in FIG. 15 and FIG.
At four locations on the outer periphery of the bracket, hook portions 115 are provided. As shown in FIG. 9, the same number of locking portions 139 are provided on the outer periphery of the case intermediate portion 13 of the case base 10 in correspondence with the locking portions 115. As shown in FIG. 19, when the case base 10 and the lid 11 are combined, these locking portions 115 and 139 abut against each other,
A clip (not shown) is attached from the outside thereof, and the case base 10 and the lid 11 are fixed to each other.

The throttle body 4 may be provided so that its internal flow path 4a extends in the longitudinal direction of the intake pipe 5. The chamber C3 may be provided downstream of the throttle body 4. Part or all of the cleaner case 3 and the intake pipe 5 may be made of a material other than resin.

Second Embodiment FIGS. 20 to 22 show an air intake device according to a second embodiment of the present invention. The suction device 31 includes a cleaner case 33 for housing the filter element 32,
A throttle body 34 for adjusting an intake air amount;
An intake pipe 35 for guiding intake air to an intake port of the engine E (see FIG. 20). Although the intake device 31 is intended for a three-cylinder engine, the present invention is applicable to other numbers of cylinders.

The cleaner case 33 includes a case bottom 40.
And a case lid 41 that is attached to and detached from the bottom 40. The packing 32a mounted on the outer periphery of the filter element 32 includes a case bottom 40 and a case lid 41.
Are housed in the cleaner case 33 in a state of being sandwiched between them. An outside air inlet 401 is formed in the side wall 400 of the case bottom 40. As indicated by an arrow in FIG. 20, the air flowing from the outside air inlet 401 into the primary chamber C1 in the case bottom 40 passes through the filter element 32 from bottom to top and forms secondary air formed in the lid 41. Flows into room C2,
Subsequently, the air is guided to the throttle body 34 via a duct 42 connected to the case lid 41, passes through the internal flow path 34a at a flow rate corresponding to the opening degree of the valve 34b, and flows through the intake pipe 35.
, And is distributed from the collecting portion 35a to each cylinder (not shown) of the engine E via the branching portion 35b.

The intake pipe 35 has a front half 36 formed integrally with the case bottom 40 and a rear half 37 formed separately from the front half 36 and joined on the parting line PL. The parting line PL is different from the first embodiment described above in that the intake pipe 35 is set in a direction substantially orthogonal to the longitudinal direction. In the first half part 36, the above-mentioned collecting part 3
5a and a part of a branch portion 35b following it are provided, and the rear half portion 37 is provided with the rest of the branch portion 35b and a flange 35c for connecting to the engine E. An opening 37a for a fuel injection device is provided in the rear half 37.

The collecting portion 35a of the intake pipe 35 is formed integrally with the case bottom 40 so that the upper end thereof opens into the inside of the cleaner case 33. The opening portion is formed on the lid 43 welded to the case bottom 40. And sealed. According to such a structure, the mold can be configured such that burrs do not occur near the entrance C of the branch portion 35b during injection molding.

That is, as shown in FIGS. 23 (a) and 23 (b), in order to form the first half 36, a pair of main dies 6 are formed.
0, 61, the core 6 for forming the gathering portion 35a
2 and a slide 63 for forming a flow path such as a branch portion 35b communicating with the collecting portion 35a.
The slide 63 is moved in the direction of arrow B in the figure in association with the operation of closing 0 and 61 (the operation in the direction of arrow A in FIG. 23B) to hit the core 62. At this time, the collecting unit 35a
Can be formed in the case bottom 40 by opening it.
2 may be formed integrally with a main mold 60 for forming the case bottom 40. Therefore, the core 62 becomes stable and the core 6
There is no risk that the positions of the slide 2 and the slide 63 will be displaced and burrs will be formed at the entrance C of the branch portion 35b.

On the other hand, as shown in FIG. 23 (c), when the core 62 'is slid with respect to the main mold in the same manner as the slide 63, the positions thereof are shifted and burrs are easily generated at the entrance C. . Further, in the configuration of FIG.
Is required to slide, so that the collecting portion 35a is
23a, it must be formed in a tapered shape that gradually becomes narrower. However, when a mold is formed as shown in FIGS. It can be formed in any size without any need.

As shown in FIGS. 20 and 21, the intake pipe 3
A pair of protruding portions 36a, 36a protruding along the inner surface of the branch portion 35a are formed on the front half portion 36 of the fifth portion 5. When the front half 36 and the rear half 37 are joined (for example, hot-plate welding), the protruding part 36a is inserted into the rear half 37 so that the pocket PC formed in the corner near the entrance of the rear half 37 is removed. It is covered with the protrusion 36a. For this reason, the step on the inner surface of the intake pipe 5 is eliminated, and the air flow is stabilized. If the protrusion 36a does not exist, the pocket P
A stagnant portion of air is formed inside the intake pipe 5 by C,
Turbulence may occur and smooth air may not be introduced.

It should be noted that the throttle body 34 may be mounted so that its internal flow path 34a is oriented vertically. The cleaner case 33 may be provided with a case middle part as in the first embodiment.

[0040]

As described above, according to the first to fourth aspects of the present invention, only the bottom of the cleaner case is formed integrally with the intake pipe, and the components above the middle of the case for accommodating the filter are removed. Since it is separable from the case bottom, when attaching the intake pipe to the engine, a relatively large work space can be secured around the intake pipe to improve workability. Moreover, in the invention of claim 2,
The case bottom and the upper wall of the intake pipe can be easily formed. In the invention of claim 3, bolts for attaching the intake pipe to the engine can be easily tightened. In the invention of claim 4, the throttle body is attached. Time is reduced.

Further, in the inventions of claims 5 to 7, since the intake pipes are divided in the longitudinal direction and formed and joined to each other, the joining portion is limited to a part of the entire length of the intake pipe, and the joint is formed. In this way, it is possible to provide a homogeneous intake device while suppressing the influence of the quality of the intake pipe on the strength of the intake pipe. In addition, according to the sixth aspect of the present invention, the mold can be configured so that burrs on the inner surface of the intake pipe do not occur, and the degree of freedom of the shape of the collecting portion can be increased. Claim 7
According to the invention, the occurrence of turbulent flow inside the intake pipe is prevented, and the air can be smoothly introduced.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing an intake device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the intake device of FIG. 1 in an assembled state.

FIG. 3 is a plan view showing a case bottom of a cleaner case and an intake pipe integrated with the cleaner case in the intake device of FIG. 1;

FIG. 4 is a sectional view taken along the line VI-VI of FIG. 3;

FIG. 5 is a sectional view taken along the line VV of FIG. 3;

FIG. 6 is a plan view showing a lower wall portion of an intake pipe in the intake device of FIG. 1;

FIG. 7 is an arrow view from the VII direction in FIG. 4;

FIG. 8 is a diagram showing a state before upper and lower wall portions of an intake pipe in the intake device of FIG. 1 are joined.

FIG. 9 is a plan view showing a middle portion of a cleaner case in the intake device of FIG. 1;

FIG. 10 is a sectional view taken along the line XX of FIG. 9;

FIG. 11 is a sectional view taken along the line XI-XI in FIG. 9;

FIG. 12 is an enlarged cross-sectional view showing a part where the case bottom part of FIG. 4 and the case middle part of FIG. 9 are hooked to each other;

FIG. 13 is an enlarged cross-sectional view showing a connection portion between a case middle portion and a throttle body in FIG. 9;

FIG. 14 is a sectional view of a lid of a cleaner case in the intake device of FIG. 1;

FIG. 15 is a view as seen from the XV direction in FIG. 14;

FIG. 16 is a view as seen from the XVI direction in FIG. 14;

FIG. 17 is a sectional view taken along the line XVII-XVII in FIG. 14;

FIG. 18 is an enlarged cross-sectional view showing a fitting portion between a partition tube provided on a lid portion in FIG. 14 and a breather connection tube provided in an intermediate portion of the case in FIG. 9;

19 is an enlarged cross-sectional view showing a portion where a clip for fixing the lid part of FIG. 14 and the middle part of the case of FIG. 9 to each other is mounted;

FIG. 20 is a sectional view showing an intake device according to a second embodiment of the present invention.

FIG. 21 is a plan view of the intake device of FIG. 20;

FIG. 22 is an external view of the intake device of FIG. 20;

FIG. 23 is a diagram showing a configuration of a mold for molding an intake pipe according to the second embodiment.

[Explanation of symbols]

 1, 31 ... intake device 2, 32 ... filter element 3, 33 ... cleaner case 4, 34 ... throttle body 5, 35 ... intake pipe 10 ... case body 11, 41 ... case lid 12, 40 ... case bottom 13 ... case Intermediate portion 14: Upper wall portion of intake pipe 15 ... Lower wall portion of intake pipe 35a ... Collective portion of intake pipe 35b ... Branch portion of intake pipe 36 ... First half of intake pipe 37 ... Second half of intake pipe 121 ... Outside air introduction Mouth C1: Primary chamber C2: Secondary chamber C3: Chamber E: Engine PL: Parting line of intake pipe

Claims (7)

[Claims] 1. A cleaner case capable of accommodating a filter element, a throttle body through which air passing through the cleaner case is guided, and an intake pipe through which air passing through the throttle body is guided to an engine. A cleaner case integrally formed with at least a part of the intake pipe; a case middle part detachably combined with the case bottom part and accommodating the filter element inside; a case middle part; And a case lid removably combined with the portion to close an opening of the cleaner case. 2. The intake pipe is formed by joining an upper wall formed integrally with the case bottom and a lower wall formed separately from the upper wall in a radial direction of the intake pipe. The intake device according to claim 1, wherein the intake device is configured as follows. 3. A mounting flange to the engine is provided at an end of the intake pipe, and a side wall of a bottom of the case includes:
The intake device according to claim 1, wherein a concave portion is provided in alignment with a bolt hole provided in the mounting flange. 4. The intake device according to claim 1, wherein the throttle body is held between the case middle portion and the intake pipe. 5. A cleaner case capable of accommodating a filter element, a throttle body through which air passing through the cleaner case is guided, and an intake pipe through which air passing through the throttle body is guided to an engine. The intake pipe is formed by joining a first half formed integrally with the bottom of the cleaner case and a second half formed separately from the bottom of the cleaner case in a longitudinal direction of the intake pipe. Features a suction device. 6. A front end portion of the intake pipe is provided with a collecting portion integrally formed with a bottom portion of the cleaner case such that an upper end opens into the inside of the cleaner case, and an upper end opening of the collecting portion is provided. 6. The intake device according to claim 5, wherein a portion is sealed by a lid portion welded to a bottom portion of the cleaner case, and the intake pipe branches from the collecting portion toward each cylinder of the engine. . 7. A joint portion of the front half portion with respect to the rear half portion is provided with a protruding portion inserted into the rear half portion to eliminate a step on the inner surface of the intake pipe at the joint portion. The intake device according to claim 5, wherein