JP2006214447A - Intake system of internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve workability when mounting by reducing the number of parts in such a way that an air cleaner, a collector, and a manifold are integrally formed from two splits. <P>SOLUTION: A lower molding 3 integrally forms a collector bottom casing 4 and a manifold lower side split 5, and an upper molding 7 integrally forms a collector upper casing 8, a manifold upper side split 9, and an air cleaner bottom casing 10. Further, when assembling an intake system 1, the lower molding 3 and the upper molding 7 are joined together first. Furthermore, a throttle device 18 is connected to a throttle mounting portion 8A of the collector upper casing 8, and an air cleaner upper casing 12 is mounted to the air cleaner bottom casing 10 with a filter 15. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an intake device for an internal combustion engine suitable for use in an intake system such as an automobile engine.

  In general, an internal combustion engine such as an automobile engine is provided with an intake device for sucking intake air from the outside into a combustion chamber of the engine. An engine intake device according to this type of prior art includes an air cleaner into which intake air flows, a throttle device connected to the air cleaner through a duct, a collector connected to the throttle device, and a collector It consists of a plurality of manifolds extending toward each cylinder of the engine.

  The intake device is housed in an engine room of an automobile or the like together with the engine body, an air cleaner is attached to an inner wall portion of the engine room via a mounting bracket or the like, and a throttle device, a collector and a manifold are disposed on the engine body side. Installed.

  During operation of the engine, intake air from the outside flows into the collector via an air cleaner, duct, throttle device, etc., and this intake air is drawn from the collector into each cylinder of the engine via each manifold. The

  On the other hand, as another prior art, there is also known an engine intake device in which an air cleaner, a collector, a manifold, and the like are integrally formed of a resin material or the like (for example, see Patent Document 1).

  In this case, an air cleaner, a collector, a throttle device, and the like are disposed on the upper side of the manifold. During the operation of the engine, first, the intake air passes through the air cleaner from the lower side toward the upper side. Subsequently, the intake air flows in a horizontal direction through a substantially L-shaped passage along the throttle device and the collector, and then flows downward from the collector into the manifold and is sucked into each cylinder of the engine.

JP-A-8-334070

  By the way, in the above-described prior art, the throttle device, the collector and the manifold are attached to the engine body in the engine room, the air cleaner is attached to the engine room, and the air cleaner and the throttle device are connected by a duct or the like.

  However, when installing the intake system in the engine room, the collector and manifold mounting work and the air cleaner mounting work must be performed separately, and after these mounting work, the duct is installed in the engine room. It is necessary to connect between the air cleaner and the throttle device in a narrow space.

  For this reason, in the prior art, not only the work for mounting the intake device in the engine room takes time, but also the use of an air cleaner mounting bracket, duct, etc. increases the number of parts of the intake device and complicates the structure. There is a problem.

  In another conventional technique, the intake air passage extending from the air cleaner inflow side to each manifold has a complicated shape bent in the vertical direction and the horizontal direction, and the resistance of the intake air flowing through the passage tends to increase. Therefore, particularly when the engine operates on the high rotation side, it is difficult to maintain a good intake state of the engine, and the engine performance may be deteriorated.

  The present invention has been made in view of the above-described problems of the prior art, and the present invention can greatly reduce the number of parts, simplify the structure, and can efficiently perform the mounting operation, and the operating performance of the internal combustion engine. An object of the present invention is to provide an intake device for an internal combustion engine that can improve the engine.

  In order to solve the above-mentioned problems, the invention of claim 1 is characterized in that a collector bottom case having an open upper side, a lower molded body integrally formed with a plurality of manifold lower divided bodies extending from the collector bottom case, and a throttle mounted on the upper side. The upper part of the collector is formed so as to surround the collector upper case joined to the upper side of the collector bottom case, the plurality of upper manifolds joined to the upper side of each manifold lower part, and the collector upper case. An upper molded body integrally formed with an open air cleaner bottom case and an air cleaner upper case that is detachably attached to the upper side of the air cleaner bottom case and covers the air cleaner bottom case are employed.

  With this configuration, when assembling the intake device, the lower molded body and the upper molded body are first joined to each other, and the air cleaner upper case is attached to the opening side of the air cleaner bottom case. The collector and the manifold can be integrally formed in a connected state.

  Further, the invention according to claim 2 is a collector bottom case having an opening on the upper side, a lower molded body integrally formed with a plurality of lower manifolds extending from the collector bottom case, and a throttle mounting portion formed on the upper side. An upper molded body integrally formed with a collector upper case joined to the upper side of the case and a plurality of manifold upper divided bodies joined to the upper side of each manifold lower divided body, and an upper side and a bottom side are opened, An air cleaner bottom case whose bottom side is detachably attached to the collector upper case and an air cleaner upper case that is detachably attached to the upper side of the air cleaner bottom case and covers the air cleaner bottom case are employed.

  As a result, when assembling the air intake device, the lower molded body and the upper molded body are first joined to each other, and then the bottom side of the air cleaner bottom case is attached to the collector upper case of the upper molded body, and the air cleaner bottom case is By attaching the case, the air cleaner, the throttle device, the collector and the manifold can be integrally formed.

  Furthermore, the invention of claim 3 is a collector in which a manifold is integrally formed, a throttle mounting portion is formed on the upper side, and an air cleaner in which the upper side and the bottom side are open and the bottom side is detachably mounted on the collector. A configuration comprising a bottom case and an air cleaner upper case that is detachably attached to the upper side of the air cleaner bottom case and covers the air cleaner bottom case is employed.

  Thus, when the intake device is assembled, the air cleaner upper case is attached to the collector via the air cleaner bottom case, so that the air cleaner, the throttle device, the collector, and the manifold can be integrally formed.

  According to a fourth aspect of the present invention, the throttle mounting portion is provided with a throttle device located in the bottom case of the air cleaner.

  As a result, the inflow side of the throttle device opens into the air cleaner bottom case, and the outflow side is connected to the collector upper case via the throttle mounting portion, so that the throttle device can be connected between the air cleaner and the collector, Air can be circulated in the collector via the throttle device.

  Furthermore, in the invention of claim 5, a filter is detachably provided between the air cleaner bottom case and the air cleaner upper case, and a throttle device is provided in the air cleaner bottom case at a downstream side of the filter. Yes.

  Thereby, a throttle device can be connected between the outflow side of the air cleaner and the collector, and the air that has passed through the filter can be circulated from the throttle device into the collector. Further, the filter can be replaced by attaching / detaching the air cleaner upper case to / from the air cleaner bottom case.

  According to a sixth aspect of the present invention, the collector is formed separately from the manifold and is integrally formed by being fixed to the manifold.

  As a result, the collector and the manifold can be respectively molded and fixed to each other to be integrated, and the intake device can be assembled by attaching the air cleaner upper case to the collector via the air cleaner bottom case.

  As described above, according to the first aspect of the present invention, the intake device is composed of the lower molded body, the upper molded body, and the air cleaner upper case, and the air cleaner bottom case of the upper molded body surrounds the collector upper case. The air cleaner, the collector and the manifold of the intake device can be easily formed integrally, and these can be assembled compactly. In addition, the air cleaner, the collector and the manifold can be attached at the same time, and the workability when assembling and attaching the intake device can be greatly improved. In addition, a mounting bracket for the air cleaner, a duct for connecting the air cleaner and the collector, and the like are not necessary, and the number of parts can be greatly reduced and the structure can be simplified. In addition, the intake air passage can be formed without being bent in a complicated manner as in the prior art, and the operating performance of the internal combustion engine can be reliably improved.

  According to the invention of claim 2, since the intake device is composed of the lower molded body, the upper molded body, the air cleaner bottom case, and the air cleaner upper case, it is possible to efficiently perform the assembling work and the mounting work of the air intake apparatus. . In addition, the number of parts can be greatly reduced, the structure can be simplified, and the operating performance of the internal combustion engine can be reliably improved. Furthermore, even when it is difficult to integrally form the air cleaner and the collector due to restrictions on the layout or the like, the intake device can be compactly formed, and the degree of freedom in layout can be increased.

  Furthermore, according to the invention of claim 3, since the intake device is composed of the collector with which the manifold is integrally formed, the air cleaner bottom case and the air cleaner upper case, it is possible to easily assemble and install the intake device. The structure can be simplified and the intake device can be made compact.

  Furthermore, according to the fourth aspect of the present invention, since the throttle device is located in the air cleaner bottom case and provided at the throttle mounting portion of the upper collector case, the air cleaner, the collector and the throttle device can be formed compactly. The air cleaner can reliably prevent the housing of the throttle device from coming into direct contact with the outside air, and heat from the internal combustion engine can be blocked from being transmitted to the throttle device. As a result, there is no need to provide a high-performance dust seal or the like for the throttle device, the weight of the throttle device can be reduced and the cost can be reduced, and the operating performance of the internal combustion engine can be reliably improved.

  According to the invention of claim 5, since the filter is detachably provided between the air cleaner bottom case and the air cleaner upper case, and the throttle device is disposed in the air cleaner bottom case, the air cleaner, the throttle device, The throttle device can be reduced in weight and cost, and the operating performance of the internal combustion engine can be improved. In addition, the filter replacement operation can be easily performed, and the maintainability can be improved.

  In addition, according to the invention of claim 6, since the manifold and the collector formed separately are fixed and integrally formed, even when the manifold or the collector has a complicated shape, Each of these can be easily formed, and the intake device can be assembled efficiently.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to FIGS.

  Here, FIG. 1 to FIG. 3 show a first embodiment according to the present invention, and in this embodiment, an intake device such as an automobile engine will be described as an example.

  Reference numeral 1 denotes an engine intake device installed in an engine room of an automobile or the like together with the engine body 2, and the intake device 1 includes a lower molded body 3, an upper molded body 7, an air cleaner upper case 12, which will be described later, An air cleaner 14, a collector 16, manifolds 17, 17,..., A throttle device 18 and the like are provided.

  Reference numeral 3 denotes a lower molded body constituting the lower side of the intake device 1, and the lower molded body 3 is made of, for example, an injection-molded resin material or the like, and has a substantially box-shaped collector bottom case 4 opened on the upper side, and a transverse section. For example, four manifold lower divided bodies 5, 5,... That are formed in a substantially circular arc shape and open on the upper side, and the upper edge of the collector bottom case 4 and each manifold lower divided body 5 are directed outward in the horizontal direction. The flange portion 6 that protrudes in this manner is integrally formed.

  The manifold lower divided body 5 is extended from the collector bottom case 4 corresponding to each cylinder (not shown) of the engine, and forms each manifold 17 together with a manifold upper divided body 9 described later. Each manifold 17 is attached to the engine body 2 via flange portions 5A and 9A formed in the manifold lower divided body 5 and the manifold upper divided body 9, and is connected to each cylinder.

  Reference numeral 7 denotes an upper molded body formed of a resin material or the like. The upper molded body 7 includes a substantially box-shaped collector upper case 8 opened on the lower side, a transverse section formed in a substantially arc shape, and a lower opened 4 ... of the manifold upper divided bodies 9, 9, ..., an air cleaner bottom case 10 that is open on the upper side and formed in a cylindrical shape, the collector upper case 8 and the lower peripheral edge of each manifold upper divided body 9 in the horizontal outer side. The other flange portion 11 projecting toward is integrally formed.

  Here, a throttle mounting portion 8 </ b> A for mounting the throttle device 18 is formed on the upper side of the collector upper case 8. A throttle device 18 is attached to the throttle attachment portion 8A. Each manifold upper divided body 9 extends from the collector upper case 8 to the engine body 2 side in correspondence with the manifold lower divided body 5. An injection valve (not shown) for injecting fuel into the manifold 17 is attached to the front end side of each manifold upper divided body 9.

  The air cleaner bottom case 10 has a cylindrical shape so that the bottom side surrounds the collector upper case 8, and is integrally formed on the upper side of the collector upper case 8 over the entire circumference. The throttle mounting portion 8 </ b> A opens into the air cleaner bottom case 10. Further, the flange portion 11 is joined to the flange portion 6 of the lower molded body 3 by using means such as vibration welding and high frequency welding, for example, and constitutes the intake device 1.

  Reference numeral 12 denotes a substantially box-shaped air cleaner upper case having an open lower end. The air cleaner upper case 12 can be attached to and detached from the upper side of the air cleaner bottom case 10 using a plurality of clips 13, as shown in FIG. Installed. The air cleaner upper case 12 covers the upper side of the air cleaner bottom case 10, and these constitute an air cleaner 14.

  A filter 15 is detachably mounted between the air cleaner upper case 12 and the air cleaner bottom case 10. Thereby, the inside of the air cleaner 14 is defined by the filter 15 into an inflow chamber 14A and an outflow chamber 14B. Further, the air cleaner 14 is provided with an outside air introduction pipe and an outside air introduction port (both not shown) for introducing outside air into the inflow chamber 14A as intake air.

  On the other hand, the upper molded body 7 is integrally fixed to the upper end side of the lower molded body 3 through the flange portions 6 and 11. The collector upper case 8 is joined to the upper side of the collector bottom case 4, and these constitute a collector 16. Moreover, the manifold upper side division body 9 is joined to the upper side of the manifold lower side division body 5, and these comprise the manifolds 17, 17, ..., respectively.

  Reference numeral 18 denotes a throttle device that increases or decreases the intake air amount of the engine. The throttle device 18 includes a substantially cylindrical housing 18A made of a metal material or the like, a valve body 18B that can be opened and closed in the housing 18A, and the like. The housing 18 </ b> A is attached to the throttle mounting portion 8 </ b> A of the collector upper case 8 using each bolt 19 and is disposed in the air cleaner bottom case 10. As a result, the throttle device 18 is located on the downstream side of the filter 15 on the inflow side and opens into the outflow chamber 14B of the air cleaner 14, and the outflow side is connected to the collector 16 via the throttle mounting portion 8A.

  Here, in the throttle device 18, the flow rate of the intake air that flows from the air cleaner 14 toward the collector 16 by opening and closing the valve body 18 </ b> B according to the operation amount of an accelerator pedal (not shown) of the automobile. And the intake air amount of the engine is variably controlled.

  Therefore, in the intake device 1, with the air cleaner 14, the throttle device 18, the collector 16, and each manifold 17 connected, the tip end side of each manifold 17 is attached to the engine body 2 side, and the engine body 2 is connected via each manifold 17. Supported on the side.

  The intake device 1 for an automobile engine or the like according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  First, during operation of the engine, the valve body 18B of the throttle device 18 opens, so that the intake air from the outside flows into the inflow chamber 14A of the air cleaner 14 through the outside air introduction pipe or the like. The intake air is cleaned by the filter 15 as indicated by an arrow A shown in FIG. 1, and then flows into the collector 16 from the throttle device 18 through the throttle mounting portion 8A of the collector upper case 8. Further, this intake air is taken into each cylinder of the engine via the manifold 17, and at this time, fuel is injected into the intake air from the injection valve of the manifold upper divided body 9.

  Further, when assembling the intake device 1, as shown in FIG. 3, first, the flange portions 6 and 11 of the lower molded body 3 and the upper molded body 7 are joined by vibration welding or the like. Subsequently, the throttle device 18 is attached to the throttle attachment portion 8A of the collector upper case 8, and the air cleaner upper case 12 is attached to the upper side of the air cleaner bottom case 10 together with the filter 15. In this state, for example, the front end side of each manifold 17 is attached to the engine body 2 side using bolts or the like.

  Thus, in the present embodiment, the intake device 1 includes the collector bottom case 4, the lower molded body 3 having the manifold lower divided body 5, the collector upper case 8, the manifold upper divided body 9, and the upper portion having the air cleaner bottom case 10. Since the molded body 7 is composed of the air cleaner upper case 12 and the like, when the intake device 1 is assembled, the lower molded body 3 and the upper molded body 7 are joined to each other, and the throttle device 18, the filter 15 and the air cleaner upper case are joined. The air cleaner 14, the collector 16 and the manifold 17 can be easily formed integrally by simply attaching 12 to the upper molded body 7.

  Moreover, when the intake device 1 is installed in the engine room, the air cleaner 14, the collector 16 and the manifold 17 can be attached at the same time by simply attaching the tip end of each manifold 17 to the engine body 2 side. 1 assembly work, attachment work, etc. can be performed efficiently.

  Further, the throttle mounting portion 8A is opened in an air cleaner bottom case 10 formed so as to surround the collector upper case 8, and the air cleaner 14, the collector 16 and the like are supported by a manifold 17 mounted on the engine body 2 side. Therefore, for example, there is no need to provide a duct for connecting the air cleaner 14 and the collector 16, a mounting bracket for the air cleaner 14, and the like, and the number of parts of the intake device 1 can be greatly reduced.

  On the other hand, since the throttle device 18 is attached to the throttle mounting portion 8A of the collector upper case 8 and is disposed in the outflow chamber 14B of the air cleaner 14, the air cleaner 14, the collector 16 and the throttle device 18 are connected. It can be formed compactly and its structure can be simplified.

  As a result, the passage of intake air from the inflow chamber 14A of the air cleaner 14 to each manifold 17 can be formed without complicated bending as in the prior art, and the intake air can be smoothly distributed toward each cylinder of the engine. it can. In addition, heat transmitted from the engine body 2 to the housing 18A of the throttle device 18 can be reliably blocked by the air cleaner 14, the intake air can be cooled efficiently, and the engine performance can be improved.

  Furthermore, by arranging the throttle device 18 in the air cleaner 14, the air cleaner 14 can prevent the housing 18A and the like from coming into direct contact with the outside air. For example, the throttle device 18 can be throttled by dust or salt in the air, heat from the engine body 2, or the like. It is possible to reliably suppress the device 18 from being adversely affected.

  As a result, there is no need to provide a high-performance dust seal or the like for the throttle device 18 or to take measures against excessive salt damage, and the throttle device 18 can be formed of a resin material having a relatively low melting point. Thus, weight reduction and cost reduction can be achieved.

  In addition, since the filter 15 is detachably provided between the air cleaner bottom case 10 and the air cleaner upper case 12, the filter 15 can be easily replaced by attaching and detaching the air cleaner upper case 12 to the air cleaner bottom case 10. The maintenance can be improved.

  Next, FIGS. 4 and 5 show a second embodiment according to the present invention. The feature of this embodiment is that the air cleaner bottom case is detachably attached to the collector upper case of the upper molded body. is there. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  Reference numeral 21 denotes an intake device for an engine according to the present embodiment. The intake device 21 is substantially the same as the intake device 1 of the first embodiment, and will be described later with a lower molded body 22, an upper molded body 26, and an air cleaner upper case. 33, a throttle device 39, and the lower molded body 22 is integrally formed with a collector bottom case 23, a manifold lower divided body 24, and a flange portion 25.

  In the upper molded body 26, a collector upper case 27, a manifold upper divided body 28, and a flange portion 29 are integrally formed, and the collector upper case 27 is formed with a throttle mounting portion 27A. However, in the present embodiment, a bottom plate 30 constituting a bottom side of an air cleaner bottom case 31 to be described later is formed integrally with a side surface portion of the collector upper case 27, and the bottom plate 30 protrudes toward the manifold upper divided body 28 side.

  Reference numeral 31 denotes an air cleaner bottom case having an upper side and a bottom side opened. The bottom side of the air cleaner bottom case 31 is formed by using a plurality of clips 32, 32,. 30 and the other end is attached to the flange portions 25 and 29 by the respective clips 32. Thereby, the air cleaner bottom case 31 is detachably attached to the upper side of the collector upper case 27 and is covered with the bottom plate 30. In this state, a throttle mounting portion 27 </ b> A of the collector upper case 27 is opened in the air cleaner bottom case 31.

  An air cleaner upper case 33 is detachably attached to the upper side of the air cleaner bottom case 31 using each clip 34. The air cleaner upper case 33 is substantially the same as in the first embodiment. In addition, an air cleaner 35 is formed, and a filter 36 is disposed in the air cleaner 35.

  The collector bottom case 23 and the collector upper case 27 are joined together to form a collector 37, and the manifold lower divided body 24 and the manifold upper divided body 28 are joined together to form a manifold 38. Further, in the air cleaner bottom case 31, a throttle device 39 attached to the throttle attachment portion 27A of the collector upper case 27 is disposed.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment. In particular, in the present embodiment, even when it is difficult to integrally form the air cleaner 35 and the collector 37 due to restrictions on the layout of the intake device 21, the intake device 21 can be formed compactly, and the degree of freedom in layout can be increased. Can be increased.

  Next, FIG. 6 shows a third embodiment according to the present invention. The feature of this embodiment is that a manifold and a collector are integrally formed. In the present embodiment, the same components as those in the second embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  Reference numeral 41 denotes an intake device for an engine according to the present embodiment. The intake device 41 is an air cleaner comprising an air cleaner bottom case 42, an air cleaner upper case 43, and a filter 44 in substantially the same manner as the intake device 21 according to the second embodiment. 45. However, in the present embodiment, the collector 47 and the manifold 48 are integrally formed as the collector manifold coupling body 46.

  The collector 47 is provided with a throttle mounting portion 47A on the upper side, and a bottom plate 47B and a flange 47C for the air cleaner 45 are integrally formed on the side surface portion. The air cleaner bottom case 42 is detachably attached to the bottom plate 47B and the flange 47C of the collector 47 through the clips 49, and the air cleaner upper case 43 is mounted on the air cleaner bottom case 42 together with the filter 44 through the clips 50. Removably attached. Further, the throttle device 51 is attached to a throttle attachment portion 47A of the collector 47.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the second embodiment.

  In each of the above embodiments, the collectors 16, 37, 47 and the manifolds 17, 38, 48 are described as being integrally formed. However, the present invention is not limited to this, and the first embodiment is illustrated in FIG. You may comprise like the modification shown in. That is, the collector bottom case 4 'and the manifold lower divided body 5' are formed separately, and the lower molded body 3 'is integrally formed by joining them, and the collector upper case 8' and the manifold upper divided body are integrally formed. The upper molded body 7 'may be integrally formed by molding 9' into a separate body and joining them.

  As a result, even when the collector bottom case 4 ', the collector upper case 8', the manifold lower divided body 5 ', and the manifold upper divided body 9' have complicated shapes, they can be formed easily. Thus, the intake device 1 can be assembled efficiently.

  Also in the second embodiment, as in the modification shown in FIG. 8, the collector bottom case 23 'of the lower molded body 22' and the manifold lower divided body 24 'are formed separately, and the upper molded body is formed. The collector upper case 27 ′ and the manifold upper divided body 28 ′ of 26 ′ may be formed separately and then joined together.

  Furthermore, in the third embodiment, as in the modification shown in FIG. 9, the collector 47 'and the manifold 48' may be formed separately and then joined together.

  On the other hand, in each of the above embodiments, the flange portions 6 and 25 of the lower molded bodies 3 and 22 and the flange portions 11 and 29 of the upper molded bodies 7 and 26 are joined using means such as vibration welding and high frequency welding. Although it was set as the structure, this invention is not restricted to this, For example, it is good also as a structure which joins these by means, such as adhesion | attachment.

  Further, in each of the above-described embodiments, the lower molded bodies 3 and 22 are arranged on the lower side in the figure, and the upper molded bodies 7 and 26 are arranged on the upper side to constitute the intake devices 1, 21 and 41. As described above, the intake devices 1, 21, 41 formed by integrating the lower molded bodies 3, 22 and the upper molded bodies 7, 26 are up, down or left in relation to the engine body 2. It may be arranged so as to have an arbitrary positional relationship with respect to the right direction, and the arrangement of the intake devices 1, 21, 41 is not limited.

  In each of the above embodiments, the case where the intake devices 1, 21, 41 are used in a four-cylinder engine has been described as an example. However, the present invention is not limited to this, and the two-cylinder, three-cylinder, or five-cylinder or more It may be applied to other engines.

  Furthermore, in each of the above-described embodiments, the case where the intake devices 1, 21, 41 are used in an engine for an automobile has been described as an example. The present invention may be applied to other internal combustion engines.

1 is a longitudinal sectional view showing an intake device for an engine according to a first embodiment of the present invention. It is sectional drawing seen from the arrow II-II direction in FIG. FIG. 2 is an exploded view showing a state before the intake device in FIG. 1 is assembled. It is a longitudinal cross-sectional view which shows the intake device of the engine by 2nd Embodiment. It is an exploded view shown in the state before assembling the air intake apparatus in FIG. It is an exploded view which shows the intake device of the engine by 3rd Embodiment. It is the same exploded view as FIG. 3 which shows the modification of 1st Embodiment. FIG. 6 is an exploded view similar to FIG. 5 showing a modification of the second embodiment. It is an exploded view similar to FIG. 6 which shows the modification of 3rd Embodiment.

Explanation of symbols

1,21,41 Intake device 3,22 Lower molded body 4,23 Collector bottom case 5,24 Manifold lower divided body 7,26 Upper molded body 8,27 Collector upper case 8A, 27A, 47A Throttle mounting portion 9, 28 Manifold upper divided body 10,31 Air cleaner bottom case 12,33 Air cleaner upper case 15,36,44 Filter 16,37,47 Collector 17,38,48 Manifold 18,39,51 Throttle device

Claims (6)

A lower molded body integrally formed with a collector bottom case having an open upper side and a plurality of manifold lower divided bodies extending from the collector bottom case;
A collector upper case formed with a throttle mounting portion on the upper side and joined to the upper side of the collector bottom case, a plurality of manifold upper divided bodies joined to the upper side of each manifold lower divided body, and the collector upper case An upper molded body integrally formed with an air cleaner bottom case formed to surround and open on the upper side;
An intake device for an internal combustion engine, comprising an air cleaner upper case that is detachably attached to an upper side of the air cleaner bottom case and covers the air cleaner bottom case. A lower molded body integrally formed with a collector bottom case having an open upper side and a plurality of manifold lower divided bodies extending from the collector bottom case;
Upper molding in which a throttle mounting portion is formed on the upper side and a collector upper case joined to the upper side of the collector bottom case and a plurality of manifold upper divided bodies joined to the upper side of each manifold lower divided body are integrally formed Body,
An air cleaner bottom case in which an upper side and a bottom side are opened, and a bottom side is detachably attached to the collector upper case;
An intake system for an internal combustion engine, comprising: an air cleaner upper case that is detachably attached to an upper side of the air cleaner bottom case and covers the air cleaner bottom case. A collector in which a manifold is integrally formed and a throttle mounting portion is formed on the upper side;
An air cleaner bottom case in which an upper side and a bottom side are opened, and a bottom side is detachably mounted on the collector;
An intake system for an internal combustion engine, comprising: an air cleaner upper case that is detachably attached to an upper side of the air cleaner bottom case and covers the air cleaner bottom case.   The intake device for an internal combustion engine according to claim 1, 2 or 3, wherein the throttle mounting portion is provided with a throttle device located in the air cleaner bottom case.   A filter is detachably provided between the air cleaner bottom case and the air cleaner upper case, and a throttle device is provided in the air cleaner bottom case at a downstream side of the filter. An intake device for an internal combustion engine according to claim 3. 6. The intake device for an internal combustion engine according to claim 1, wherein the collector is formed separately from the manifold and is integrally formed by being fixed to the manifold.

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