JP2016102439A - Conduit connection structure, air cleaner device, internal combustion engine and conduit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique to restrict poor connection of a conduit or improve sealing characteristic.SOLUTION: A fitting part 34 of a dust side duct 30 acting as a conduit for an air cleaner main body part 20 is provided with three protrusions 35a, 35b, 35c along an axial direction of the fitting part 34, and with three recesses 36 equally spaced apart along a peripheral direction of the fitting part 34. In addition, the protrusions 35 one of which is constituted to have its protrusion width becoming large as it is arranged at an axial deep side of the fitting part 34. Also when the dust side duct 30 is swung at any direction, all the protrusions 35a, 35b, 35c elastically engaged with the air cleaner main body part 20 are maintained, so that it is possible to restrict partial wear of the protrusions 35. In addition, a larger engaging area can be assured as the protrusions 35 approach the interface with the external side, so that it is possible to improve a sealing characteristic with the protrusions 35.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a conduit connection structure for connecting a conduit to a body member, an internal combustion engine configured to connect a duct portion to an air cleaner body portion using the conduit connection structure, and a conduit connected to the body member. .

  Japanese Patent No. 3534189 (Patent Document 1) describes a structure in which a connecting duct is connected to a mounting duct of a branch box connected to an air conditioning supply source.

  In the connection structure, two annular protrusions are provided on the outer peripheral surface of the mounting duct, and a plurality of split grooves extending in the axial direction are provided along the circumferential direction of the mounting duct. An annular groove that engages with two annular protrusions provided on the outer peripheral surface of the mounting duct is provided on the inner peripheral surface of the connecting duct. Thereby, the connecting duct can be easily connected to the mounting duct by the diameter reducing action of the mounting duct by the dividing groove. Further, since the annular protrusion and the annular groove are elastically engaged, the connection duct can be reliably connected to the mounting duct, and good sealing performance can be obtained.

Japanese Patent No. 3534189

  However, in the connection structure described above, a plurality of dividing grooves are provided along the circumferential direction of the mounting duct, whereby the annular protrusion is divided into a plurality in the circumferential direction. When the connection duct vibrates due to this, the engagement state between the annular protrusion and the annular groove may vary depending on the vibration direction. That is, a certain annular protrusion and an annular groove may be in contact with each other with high surface pressure, and a certain annular protrusion and an annular groove may be in a non-contact state. As a result, uneven wear occurs in the annular protrusion and the annular groove, resulting in poor connection between the mounting duct and the connecting duct and a decrease in sealing performance. In the connection structure described above, there is still room for improvement in this respect.

  This invention is made | formed in view of the above, and aims at providing the technique which contributes to suppression of the connection failure of a conduit | pipe and improvement of a sealing performance.

  In order to achieve the above object, the conduit connection structure of the present invention employs the following means.

  According to the preferable form of the conduit connection structure according to the present invention, the conduit connection structure for connecting the conduit to the main body member is configured. In the connection structure of the conduit, the main body member has a cylindrical portion, and the conduit has a fitting portion that is fitted or externally fitted to the cylindrical portion. An annular cylindrical groove or an annular cylindrical projection is provided on the inner or outer peripheral surface of the cylindrical portion. In addition, an annular fitting portion side protrusion that engages with the cylindrical portion side groove or an annular fitting portion side groove that engages with the cylindrical portion side protrusion is provided on the outer peripheral surface or inner peripheral surface of the fitting portion. . Furthermore, the three axial notches extending in the direction along the axial direction of the cylindrical part or the fitting part from the tip of the cylindrical part or the fitting part are formed in the cylindrical part or the fitting part. The three axial notches are arranged at equal intervals in the circumferential direction of the cylindrical portion or the fitting portion. Then, the cylindrical part side fitting or the cylindrical part side protrusion and the fitting part side protrusion or the fitting part are bent by bending the cylindrical part or fitting part having the axial notch and fitting the cylindrical part and the fitting part. The side groove is configured to be elastically engaged.

  The “main body member” in the present invention typically means a main body portion of an air cleaner device provided in an internal combustion engine for filtering dust and dust in the air when air is supplied to the combustion chamber of the internal combustion engine. Is applicable. The “conduit” in the present invention typically corresponds to a duct connected to the main body of the air cleaner device.

  According to the present invention, three axial cutouts are formed in the cylindrical portion or the fitting portion, and the three axial cutouts are arranged at equal intervals in the circumferential direction of the cylindrical portion or the fitting portion, that is, Since the cylindrical part side groove or the cylindrical part side protrusion or the fitting part side protrusion or the fitting part side groove is divided into three at equal intervals in the circumferential direction of the cylindrical part or the fitting part, the conduit is caused by vibration. In any of the directions, any of the cylindrical portion side grooves or cylindrical portion side protrusions, the fitting portion side protrusions or the fitting portion side grooves divided into three can be fitted to the corresponding fitting portion side protrusions or The elastic engagement with the fitting portion side groove or the cylindrical portion side groove or the cylindrical portion side protrusion is maintained.

  Thereby, since it can suppress that partial wear arises in a cylindrical part side groove | channel or a cylindrical part side protrusion, a fitting part side protrusion, or a fitting part side groove | channel, the connection failure of a conduit | pipe and a main body member can be suppressed. In addition, it is possible to suppress deterioration in sealing performance due to non-contact between the cylindrical portion side groove or the cylindrical portion side protrusion and the fitting portion side protrusion or the fitting portion side groove.

  According to the further form of the conduit connection structure according to the present invention, the axial notch is configured to be formed in a cylindrical portion in which the fitting portion is externally fitted or a fitting portion in which the fitting portion is internally fitted in the cylindrical portion. Yes.

  According to this form, since it is the structure which forms an axial notch in the side arrange | positioned inside among a cylindrical part and a fitting part, it can suppress that a dust penetrate | invades into an inside from an axial notch. Further, the workability when fitting the cylindrical portion and the fitting portion can be improved as compared with the configuration in which the axial notch is formed on the outer side of the cylindrical portion and the fitting portion. it can.

  According to the further form of the connection structure of the conduit | pipe which concerns on this invention, the fitting part is comprised so that it may fit in a cylindrical part. A plurality of cylindrical portion side grooves or cylindrical portion side protrusions are provided along the axial direction, and the groove width or the protrusion width is configured to increase toward the front side in the fitting direction when the fitting portion is fitted into the cylindrical portion. . A plurality of fitting portion side protrusions or fitting portion side grooves are provided along the axial direction corresponding to the cylindrical portion side grooves or the cylindrical portion side protrusions, and the protrusion width or groove width increases toward the rear side in the fitting direction. It is configured as follows.

  According to this form, among the cylindrical part side groove or the cylindrical part side protrusion and the fitting part side protrusion or the fitting part side groove provided in the axial direction on the inner peripheral surface of the cylindrical part and the outer peripheral surface of the fitting part, The groove width and protrusion width are made larger in the cylindrical portion side groove or the cylindrical portion side protrusion and the fitting portion side protrusion or the fitting portion side groove arranged on the front end side of the cylindrical portion near the boundary and the rear side in the fitting direction of the fitting portion. Therefore, a large contact area between the cylindrical portion side groove or the cylindrical portion side protrusion and the fitting portion side protrusion or the fitting portion side groove can be ensured in a portion close to the boundary with the outside.

  Thereby, the sealing performance by engagement with the cylindrical part side groove or the cylindrical part side protrusion and the fitting part side protrusion or the fitting part side groove is improved. In addition, since the contact surface pressure between the cylindrical part side groove or the cylindrical part side protrusion and the fitting part side protrusion or the fitting part side groove can be reduced as the part is closer to the boundary with the outside, the cylindrical part is closer to the part with the outside. The wear resistance of the side groove or cylindrical portion side protrusion and the fitting portion side protrusion or fitting portion side groove can be improved.

  According to the further form of the connection structure of the conduit | pipe which concerns on this invention, the fitting part is comprised so that it may be fitted by the cylindrical part. A plurality of cylindrical portion side grooves or cylindrical portion side protrusions are provided along the axial direction, and the groove width or the protrusion width is configured to increase toward the rear side in the fitting direction when the fitting portion is externally fitted to the cylindrical portion. Yes. A plurality of fitting-part-side protrusions or fitting-part-side grooves are provided along the axial direction corresponding to the cylindrical part-side groove or the cylindrical part-side protrusion, and the protrusion width or groove width increases toward the front side in the fitting direction. It is configured.

  According to this embodiment, among the fitting portion side protrusion or fitting portion side groove and the cylindrical portion side groove or cylindrical portion side protrusion provided in the axial direction on the inner peripheral surface of the fitting portion and the outer peripheral surface of the cylindrical portion, The protrusion width and groove width are made larger as the fitting portion side protrusion or fitting portion side groove and the cylindrical portion side groove or cylindrical portion side protrusion arranged near the front end side of the fitting portion and the rear side in the fitting direction of the cylindrical portion. Therefore, a large contact area between the cylindrical portion side groove or the cylindrical portion side protrusion and the fitting portion side protrusion or the fitting portion side groove can be ensured in a portion close to the boundary with the outside.

  Thereby, the sealing performance by engagement with the cylindrical part side groove or the cylindrical part side protrusion and the fitting part side protrusion or the fitting part side groove is improved. In addition, since the contact surface pressure between the cylindrical part side groove or the cylindrical part side protrusion and the fitting part side protrusion or the fitting part side groove can be reduced as the part is closer to the boundary with the outside, the cylindrical part is closer to the part with the outside. The wear resistance of the side groove or cylindrical portion side protrusion and the fitting portion side protrusion or fitting portion side groove can be improved.

  According to the preferable form of the air cleaner apparatus which concerns on this invention, the air cleaner apparatus which introduces external air into the intake system components of an internal combustion engine is comprised. The air cleaner apparatus includes an air cleaner main body connected to intake system components and a duct configured to introduce outside air into the air cleaner main body. The main body member is an air cleaner main body, the duct is a conduit, and the duct is connected to the air cleaner main body using the conduit connection structure according to the present invention in any of the above-described aspects. Yes.

  According to the present invention, since it is a configuration using the conduit connection structure according to the present invention in any of the above-described aspects, the same effect as the effect of the conduit connection structure according to the present invention, for example, a duct portion and air An effect of suppressing poor connection with the cleaner body and improving sealing performance can be achieved.

  According to the preferable form of the internal combustion engine which concerns on this invention, the internal combustion engine comprised so that external air may be introduce | transduced into intake system components via an air cleaner apparatus is comprised. In the internal combustion engine, the air cleaner device includes an air cleaner main body connected to the intake system components and a duct configured to introduce outside air into the air cleaner main body. The main body member is an air cleaner main body, the duct is a conduit, and the duct is connected to the air cleaner main body using the conduit connection structure according to the present invention in any of the above-described aspects. Yes.

  According to the present invention, since it is a configuration using the conduit connection structure according to the present invention in any of the above-described aspects, the same effect as the effect of the conduit connection structure according to the present invention, for example, a duct portion and air An effect of suppressing poor connection with the cleaner body and improving sealing performance can be achieved.

  According to a preferred form of the conduit according to the present invention, a conduit connected to the body member is constructed. The conduit has a fitting portion that is fitted or fitted into the cylindrical portion of the main body member. On the outer peripheral surface or inner peripheral surface of the fitting portion, an annular fitting portion side protrusion that engages with an annular cylindrical portion side groove or an annular cylindrical portion side protrusion provided on the inner peripheral surface or outer peripheral surface of the cylindrical portion. Or the annular fitting part side groove | channel is provided, and the three axial notches extending in the direction along the axial direction of a fitting part from the front-end | tip of a fitting part are formed. The three axial notches are arranged at equal intervals in the circumferential direction of the fitting portion.

  The “main body member” in the present invention typically means a main body portion of an air cleaner device provided in an internal combustion engine for filtering dust and dust in the air when air is supplied to the combustion chamber of the internal combustion engine. Is applicable. The “conduit” in the present invention typically corresponds to a duct connected to the main body of the air cleaner device.

  According to the present invention, the three axial cutouts are formed in the fitting portion, and the three axial cutouts are arranged at equal intervals in the circumferential direction of the fitting portion, that is, the fitting portion side protrusion. Or since the fitting part side groove is divided into three parts at equal intervals in the circumferential direction of the fitting part, any of the divided parts is divided into three parts even when the conduit is shaken in any direction by vibration. Even in the fitting portion side protrusion or the fitting portion side groove, elastic engagement with the cylindrical portion side groove or the cylindrical portion side protrusion is maintained.

  Thereby, since it can suppress that partial wear arises in a fitting part side protrusion or a fitting part side groove | channel, a cylindrical part side groove | channel, or a cylindrical part side protrusion, the connection defect to the main body member of a conduit | pipe can be suppressed. In addition, it is possible to suppress deterioration in sealing performance due to non-contact between the cylindrical portion side groove or the cylindrical portion side protrusion and the fitting portion side protrusion or the fitting portion side groove.

  According to the further form of the conduit | pipe which concerns on this invention, the fitting part is comprised so that it may fit in a cylindrical part. A plurality of fitting portion side protrusions or fitting portion side grooves are provided along the axial direction corresponding to the cylindrical portion side groove or the cylindrical portion side protrusion, and after the fitting direction when the fitting portion is fitted into the cylindrical portion. The protrusion width or groove width is increased toward the side.

  According to this form, it arrange | positions in the fitting direction rear side of the fitting part near the boundary with the exterior among the fitting part side protrusion or fitting part side groove | channel provided in the axial direction on the outer peripheral surface of the fitting part. Since the groove width and the protrusion width are formed to be larger as the fitting portion side protrusion or the fitting portion side groove is formed, the cylindrical portion side groove or the cylindrical portion side protrusion and the fitting portion side protrusion or the fitting are fitted in a portion close to the boundary with the outside. A large contact area with the part side groove can be secured.

  Thereby, the contact surface pressure between the cylindrical part side groove or the cylindrical part side protrusion and the fitting part side protrusion or the fitting part side groove can be reduced, and the cylindrical part side groove or the cylindrical part side protrusion and the fitting part side protrusion or the fitting part side groove can be reduced. The wear resistance can be improved, and the sealing performance can be improved.

  According to the further form of the conduit | pipe which concerns on this invention, the fitting part is comprised so that it may be fitted by the cylindrical part. A plurality of fitting portion side protrusions or fitting portion side grooves are provided along the axial direction corresponding to the cylindrical portion side groove or the cylindrical portion side protrusion, and the front side in the fitting direction when the fitting portion is externally fitted to the cylindrical portion. The protrusion width or the groove width is increased.

  According to this form, it arrange | positions in the fitting direction front side of the fitting part near the boundary with the exterior among the fitting part side protrusion or fitting part side groove | channel provided in the axial direction on the inner peripheral surface of a fitting part. Since the groove width and the protrusion width are formed to be larger as the fitting portion side protrusion or the fitting portion side groove is formed, the cylindrical portion side groove or the cylindrical portion side protrusion and the fitting portion side protrusion or the fitting are fitted in a portion close to the boundary with the outside. A large contact area with the part side groove can be secured.

  Thereby, the contact surface pressure between the cylindrical part side groove or the cylindrical part side protrusion and the fitting part side protrusion or the fitting part side groove can be reduced, and the cylindrical part side groove or the cylindrical part side protrusion and the fitting part side protrusion or the fitting part side groove can be reduced. The wear resistance can be improved, and the sealing performance can be improved.

  According to the present invention, it is possible to suppress poor connection of a conduit and improve sealing performance.

1 is a configuration diagram showing an outline of a configuration of an internal combustion engine 1 to which a conduit connection structure according to an embodiment of the present invention is applied. 2 is a configuration diagram showing an outline of the configuration of an air cleaner main body 20. FIG. FIG. 6 is a cross-sectional view of a connection part 22. 2 is an external view showing an external appearance of a dust side duct 30. FIG. It is an enlarged view which expands and shows the fitting part. It is sectional drawing which shows the BB cross section of FIG. It is the front view which looked at the dust side duct 30 from the front end side. It is sectional drawing of the connection part 122 of the air cleaner main-body part 120 of a modification. It is sectional drawing of the fitting part 134 of the dust side duct 130 of a modification. It is sectional drawing of the connection part 222 of the air cleaner main-body part 220 of the modification. It is sectional drawing of the fitting part 234 of the dust side duct 230 of a modification. It is sectional drawing of the connection part 322 of the air cleaner main-body part 320 of a modification. It is sectional drawing of the fitting part 334 of the dust side duct 330 of a modification.

  Next, the form for implementing this invention is demonstrated using an Example.

  As shown in FIG. 1, an internal combustion engine 1 to which a conduit connection structure according to an embodiment of the present invention is applied, includes a cylinder head 2, a rocker cover 4 attached to an upper portion of the cylinder head 2, and a cylinder head 2. The cylinder block 6 attached to the lower portion, the upper oil pan 8 attached to the lower portion of the cylinder block 6, the lower oil pan 10 attached to the lower portion of the upper oil pan 8, and the upper portion of the rocker cover 4 are disposed. An intake manifold 12 and an air cleaner device 14 connected to the intake manifold 12 are provided.

  As shown in FIG. 1, the air cleaner device 14 is configured to introduce outside air into the intake manifold 12 via a throttle valve device 16, and is connected to the air cleaner body 20 and the air cleaner body 20. The dust side duct 30 is provided. The air cleaner main body portion 20 corresponds to a “main body member” in the present invention, and the dust side duct 30 is an example of an implementation configuration corresponding to the “conduit” and the “duct portion” in the present invention.

  As shown in FIG. 2, the air cleaner body 20 includes a connecting portion 22 to which the dust side duct 30 is connected and a connecting portion 26 to which the throttle valve device 16 is connected. As shown in FIGS. 2 and 3, the connecting portion 22 is configured in a cylindrical shape. As shown in FIG. 3, an annular groove 24 is formed on the inner peripheral surface of the connection portion 22. The connection part 22 is an example of the implementation structure corresponding to the "cylindrical part" in this invention.

  As shown in FIG. 3, the concave groove 24 includes three concave grooves 24 a, 24 b, and 24 c that are arranged at predetermined intervals in the axial direction of the connecting portion 22. The groove width (the length in the left-right direction in FIG. 3) of each groove 24a, 24b, 24c is the largest in the groove 24c arranged on the most distal side (the right side in FIG. 3) of the connecting portion 22, and the groove 24b The concave grooves 24c are configured to become smaller in this order.

  In the present embodiment, the groove depths of the concave grooves 24a, 24b, and 24c are all configured to be the same. The concave groove 24 and the concave grooves 24a, 24b, 24c are an example of an implementation configuration corresponding to the “cylindrical portion side groove” in the present invention.

  A mode in which three concave grooves 24a, 24b, and 24c are arranged at predetermined intervals in the axial direction of the connecting portion 22 is a mode in which “a plurality of cylindrical side grooves are provided along the axial direction of the cylindrical portion” in the present invention. It is an example of the implementation structure corresponding to. In addition, the groove width of the concave grooves 24a, 24b, 24c is the largest in the concave groove 24c arranged on the most distal end side of the connecting portion 22, and the aspect configured to decrease in the order of the concave groove 24b, the concave groove 24c, The “cylindrical part side groove” in the present invention is an example of an implementation configuration corresponding to an aspect in which the groove width is configured to increase toward the front side in the fitting direction when the fitting part is fitted into the cylindrical part.

  The dust side duct 30 is made of a resin material. As shown in FIG. 4, the dust side duct 30, the fitting portion 34 fitted to the connection portion 22 of the air cleaner main body portion 20, and the dust side duct 30. Is attached to the intake manifold 12.

  The fitting part 34 is configured to have an outer diameter slightly larger than the inner diameter of the connection part 22. As shown in FIGS. 5 and 6, an annular protrusion 35 is formed on the outer peripheral surface of the fitting portion 34. The protrusion 35 includes three protrusions 35 a, 35 b, and 35 c that are arranged at a predetermined interval in the axial direction of the fitting portion 34. The protrusion width of the protrusions 35a, 35b, and 35c (the length in the left-right direction in FIGS. 5 and 6) is the depth in the axial direction of the fitting part 34 from the tip side (the left side in FIGS. 5 and 6). It is comprised so that it may become large as it goes to the side (right side of FIG. 5 and FIG. 6).

  In addition, the protrusion height of each protrusion 35a, 35b, 35c is comprised so that it may become substantially the same magnitude | size as the groove depth of each corresponding recessed groove 24a, 24b, 24c. The protrusion 35 and the protrusions 35a, 35b, and 35c are an example of an implementation configuration corresponding to the “fitting portion side protrusion” in the present invention. Further, the aspect in which the protrusion 35 is configured so that the protrusion width increases as the protrusion 35 moves from the distal end side of the fitting portion 34 toward the back side in the axial direction of the fitting portion 34 is referred to as “fitting portion side protrusion” in the present invention. These are examples of the implementation structure corresponding to the aspect which is comprised so that protrusion width | variety may become large toward the back side of a fitting direction.

  Further, as shown in FIGS. 5 and 6, the fitting portion 34 has three notches 36 configured to extend from the distal end side of the fitting portion 34 along the axial direction of the fitting portion 34. Is formed. The notch 36 is an example of an implementation configuration corresponding to the “axial notch” in the present invention.

  As shown in FIG. 7, the three notches 36 are arranged at equal intervals (120 ° intervals) along the circumferential direction of the fitting portion 34. In other words, it can be said that the fitting part 34 and each protrusion 35a, 35b, 35c are divided into three at equal intervals (120 degree intervals) along the circumferential direction by the notch 36. As shown in FIGS. 5 and 6, the three notches 36 are fitted further than the protrusion 35 c provided on the innermost side in the axial direction of the fitting portion 34 (the right side in FIGS. 5 and 6). It has an axial length that reaches the back side in the axial direction of the portion 34 (the right side in FIGS. 5 and 6).

  Next, an assembling operation of the air cleaner device 14, particularly an operation when the dust side duct 30 is fitted to the air cleaner main body 20 will be described. When fitting the dust side duct 30 to the air cleaner main body 20, first, the diameter of the dust side duct 30 is reduced by pressing the fitting portion 34 of the dust side duct 30 inward in the radial direction. It is inserted into the connection part 22 of the part 20.

  Here, since the notch 36 is formed in the fitting portion 34, the fitting portion 34 can be easily reduced in diameter by hand, and the insertion work into the connecting portion 22 can be easily performed. . The notch 36 has a length in the axial direction that reaches the far side in the axial direction of the fitting portion 34 (the right side in FIGS. 5 and 6) further than the projection 35c. Since the diameter of the portion where 35c is formed can be reduced well, further insertion work in the connecting portion 22 of the fitting portion 34 described later can be easily performed.

  The fitting portion 34 is connected to the connecting portion 22 in the connecting portion 22 until the protrusions 35a, 35b, 35c of the fitting portion 34 are engaged with the corresponding concave grooves 24a, 24b, 24c of the connecting portion 22, respectively. This is inserted toward the back side in the axial direction, and thereby the connection work of the dust side duct 30 to the air cleaner body 20 is completed.

  At this time, the projections 35a, 35b, and 35c are elastically engaged with the concave grooves 24a, 24b, and 24c by the restoring force (the force that faces radially outward) of the fitting portion 34 that has been reduced in diameter. Thereby, fitting with the fitting part 34 and the connection part 22 can be made firm.

  Moreover, since the protrusions 35a, 35b, and 35c are divided at equal intervals (120 ° intervals) along the circumferential direction of the fitting portion 34 by the notches 36, the air cleaner device is operated along with the operation of the internal combustion engine 1. 14, even when the dust side duct 30 swings in any direction due to the vibration, elastic engagement is maintained in all the projections 35 a, 35 b, 35 c and the respective concave grooves 24 a, 24 b, 24 c. Is done.

  That is, any one of the protrusions 35a, 35b, 35c and the concave grooves 24a, 24b, 24c is engaged with an excessive surface pressure, or each of the protrusions 35a, 35b, 35c and the concave grooves 24a, 24b, 24c. It is prevented that any of the elastic engagement is released.

  Thereby, it is possible to satisfactorily suppress the occurrence of uneven wear in any of the protrusions 35a, 35b, 35c and the concave grooves 24a, 24b, 24c. As a result, it is possible to suppress the occurrence of poor connection between the dust side duct 30 and the air cleaner body 20. Further, it is possible to suppress a decrease in sealing performance due to the release of the elastic engagement between the protrusions 35a, 35b, and 35c and the concave grooves 24a, 24b, and 24c.

  In addition, since the groove | channel width and protrusion width | variety are large structures, the groove | channel width and protrusion width | variety are large as the groove | channel 24 arrange | positioned at the front end side of the connection part 22, and the protrusion 35 arrange | positioned at the base side of the fitting part 34, The larger the contact area between the groove 24 and the protrusion 35, the larger the contact area 24 and the protrusion 35 can be. Thereby, the sealing performance by the engagement between the concave groove 24 and the protrusion 35 is improved.

  Further, since the contact surface pressure between the concave groove 24 and the projection 35 can be lowered as the concave groove 24 and the projection 35 are closer to the boundary with the outside, the concave groove 24 and the projection are closer to the concave groove 24 and the projection 35 closer to the boundary with the outside. The wear resistance of 35 can be improved.

  Further, since the notch 36 is provided on the side of the fitting part 34 to be inserted inside the connection part 22, the notch 36 is covered by the connection part 22, and the inside of the air cleaner device 14 is provided via the notch 36. Intrusion of dust can be suppressed.

  In the present embodiment, the groove width and the protrusion width of the concave groove 24 and the protrusion 35 closer to the boundary with the outside are configured to be larger, but the groove width and the protrusion width of each concave groove 24 and the protrusion 35 are the same. A configuration in which the size is set may be used.

  In the present embodiment, three concave grooves 24 a, 24 b, 24 c are provided on the inner peripheral surface of the connection portion 22 of the air cleaner body 20, and three protrusions 35 a are formed on the outer peripheral surface of the fitting portion 34 of the dust side duct 30. , 35b, and 35c are provided, but the inner peripheral surface of the connection portion 122 as illustrated in the connection portion 122 of the air cleaner main body 120 and the fitting portion 134 of the dust side duct 130 shown in FIGS. The three protrusions 124a, 124b, and 124c may be provided on the outer peripheral surface of the fitting portion 134, and the three concave grooves 135a, 135b, and 135c may be provided on the outer peripheral surface of the fitting portion 134.

  The air cleaner main body 120 corresponds to the “main body member” in the present invention, the connection portion 122 corresponds to the “cylindrical portion” in the present invention, and the dust side duct 130 corresponds to the “conduit” and the “duct portion” in the present invention. It is an example of the implementation structure corresponding to "." Further, the protrusions 124a, 124b, and 124c correspond to the “cylindrical portion side protrusion” in the present invention, and the concave grooves 135a, 135b, and 135c are examples of an implementation configuration corresponding to the “fitting portion side groove” in the present invention. .

  In the present embodiment, the fitting portion 34 is internally fitted to the connection portion 22, but the fitting portion may be externally fitted to the connection portion.

  As an aspect in which the fitting portion is externally fitted to the connection portion, for example, as illustrated in the connection portion 222 of the air cleaner body 220 and the fitting portion 234 of the dust side duct 230 illustrated in FIGS. Three protrusions 224a, 224b, and 224c are provided on the outer peripheral surface of the portion 222, and three concave grooves 235a, 235b, and 235c are provided on the inner peripheral surface of the fitting portion 234, and the fitting portion 234 is externally fitted to the connecting portion 222. The structure which performs is considered.

  In this case, in consideration of workability when the fitting portion 234 is externally fitted to the connection portion 222, three cutouts 236 may be provided on the outer periphery of the connection portion 222. Note that the three notches 236 may be arranged at equal intervals (120 ° intervals) along the circumferential direction of the connecting portion 222.

  The air cleaner main body portion 220 corresponds to the “main body member” in the present invention, the connection portion 222 corresponds to the “cylindrical portion” in the present invention, and the dust side duct 230 corresponds to the “conduit” and “duct portion” in the present invention. It is an example of the implementation structure corresponding to "." Further, the protrusions 224a, 224b, and 224c correspond to the “cylindrical portion side protrusion” in the present invention, and the concave grooves 235a, 235b, and 235c are an example of an implementation configuration corresponding to the “fitting portion side groove” in the present invention. .

  Further, as another aspect of fitting the fitting part to the connection part, as exemplified in the connection part 322 of the air cleaner main body part 320 exemplified in FIGS. 12 and 13 and the fitting part 334 of the dust side duct 330, Three concave grooves 324 a, 324 b, and 324 c are provided on the outer peripheral surface of the connection portion 322, and three protrusions 335 a, 335 b, and 335 c are provided on the inner peripheral surface of the fitting portion 334, and the fitting portion 334 is attached to the connection portion 322. A fitting configuration is also conceivable.

  In this case as well, like the above-described modification, in consideration of workability when the fitting portion 334 is externally fitted to the connection portion 322, the three cutouts 336 may be provided on the outer periphery of the connection portion 322. Note that the three notches 336 may be arranged at equal intervals (120 ° intervals) along the circumferential direction of the connection portion 322.

  The air cleaner main body 320 corresponds to the “main body member” in the present invention, the connection portion 322 corresponds to the “cylindrical portion” in the present invention, and the dust side duct 330 corresponds to the “conduit” and the “duct portion” in the present invention. It is an example of the implementation structure corresponding to "." Further, the concave grooves 324a, 324b, and 324c correspond to the “cylindrical portion side groove” in the present invention, and the protrusions 335a, 335b, and 335c are examples of an implementation configuration corresponding to the “fitting portion side protrusion” in the present invention. .

  In the present embodiment and the above-described modification, the fitting portions 34, 134 and the connecting portion 222 arranged on the inner peripheral side of the connecting portions 22, 122, 222, 322 and the fitting portions 34, 134, 234, 334. , 322 side is provided with notches 36, 136, 236, 336, but of the connection parts 22, 122, 222, 322 and the fitting parts 34, 134, 234, 334, the connection part arranged on the outer peripheral side 22 and 122 and the notches 36, 136, 236, and 336 may be provided on the fitting portions 234 and 334 side.

  In the present embodiment and the modification described above, the notches 36, 136, 236, and 336 are provided on the fitting portions 34 and 134 and the connecting portions 222 and 322, but the notches 36, 136, 236, and 336 are provided. The engagement may be confirmed by elastic deformation of the fitting part and the connection part.

  In the present embodiment and the above-described modification, the concave grooves 24, 135, 235, 324 and the protrusions 35, 124, 224, 335 are connected to the connecting portions 22, 122, 222, 322 and the fitting portions 34, 134, 234, respectively. Although three grooves 334 are provided along the axial direction of 334, two grooves or four or more grooves may be provided.

  In the present embodiment and the modifications described above, the conduit connection structure according to the embodiment of the present invention is applied to the connection of the dust side duct 30 to the air cleaner body 20, but the present invention is not limited to this. For example, the present invention may be applied to the connection between the throttle valve device 16 and the connection portion 26 of the air cleaner body 20. Or you may apply not only to the internal combustion engine 1 but to the connection of other ducts, such as air-conditioning equipment.

(Correspondence between each component of the embodiment and each component of the present invention)
This embodiment shows an example for carrying out the present invention. Therefore, the present invention is not limited to the configuration of the present embodiment.

1 Internal combustion engine (internal combustion engine)
2 Cylinder Head 4 Rocker Cover 6 Cylinder Block 8 Upper Oil Pan 10 Lower Oil Pan 12 Intake Manifold 14 Air Cleaner Device (Air Cleaner Device)
16 Throttle valve device 20 Air cleaner body (main body member, air cleaner body)
22 Connection part (cylindrical part)
24 concave groove (cylindrical side groove)
24a concave groove (cylindrical side groove)
24b concave groove (cylindrical side groove)
24c concave groove (cylindrical side groove)
26 Connection 30 Dust side duct (conduit, duct)
32 Duct body 34 Fitting part (fitting part)
35 Protrusion (fitting part side protrusion)
35a Protrusion (fitting part side protrusion)
35b Protrusion (fitting part side protrusion)
35c Protrusion (fitting part side protrusion)
36 Notch (Axial Notch)
38 Mounting part 120 Air cleaner body (main body member)
122 Connection part (cylindrical part)
124a Protrusion (cylindrical protrusion)
124b Protrusion (cylindrical part protrusion)
124c Protrusion (cylindrical part protrusion)
130 Dust side duct (conduit, duct part)
134 Fitting part (fitting part)
135a Groove (fitting side groove)
135b Groove (fitting side groove)
135c Groove (fitting part side groove)
136 Notch (Axial notch)
220 Air cleaner body (body member)
222 Connection part (cylindrical part)
224a Protrusion (cylindrical protrusion)
224b Protrusion (cylindrical part protrusion)
224c Protrusion (cylindrical protrusion)
230 Dust side duct (conduit, duct part)
234 Fitting part (fitting part)
235a Groove (fitting part side groove)
235b Groove (fitting part side groove)
235c Groove (fitting part side groove)
236 Notch (Axial notch)
320 Air cleaner body (body member)
322 Connection part (cylindrical part)
324a Groove (Cylinder side groove)
324b Groove (Cylinder side groove)
324c Groove (Cylinder side groove)
330 Dust side duct (conduit, duct part)
334 Fitting part (fitting part)
335a Protrusion (fitting part side protrusion)
335b Protrusion (fitting part side protrusion)
335c Protrusion (fitting part side protrusion)
336 Notch (axial notch)

Claims (9)

A conduit connection structure for connecting a conduit to a body member,
The main body member has a cylindrical portion,
The conduit has a fitting part that is fitted or fitted into the cylindrical part,
On the inner peripheral surface or the outer peripheral surface of the cylindrical portion, an annular cylindrical portion side groove or an annular cylindrical portion side protrusion is provided,
An annular fitting portion side protrusion that engages with the cylindrical portion side groove or an annular fitting portion side groove that engages with the cylindrical portion side protrusion is provided on the outer peripheral surface or inner peripheral surface of the fitting portion. ,
The cylindrical portion or the fitting portion is formed with three axial notches extending from the tip of the cylindrical portion or the fitting portion in a direction along the axial direction of the cylindrical portion or the fitting portion. And
The three axial notches are arranged at equal intervals in the circumferential direction of the cylindrical part or the fitting part,
The cylindrical portion side groove or the cylindrical portion side protrusion and the fitting portion are formed by bending the cylindrical portion or the fitting portion having the axial notch to fit the cylindrical portion and the fitting portion. A connection structure for a conduit configured to be elastically engaged with a side protrusion or the fitting portion side groove. The conduit connection structure according to claim 1, wherein the axial notch is configured to be formed in the cylindrical portion to which the fitting portion is externally fitted or the fitting portion that is internally fitted in the cylindrical portion. . The fitting portion is configured to be fitted into the cylindrical portion,
A plurality of the cylindrical portion side grooves or the cylindrical portion side protrusions are provided along the axial direction, and the groove width or the protrusion width increases toward the front side in the fitting direction when the fitting portion is fitted into the cylindrical portion. It is configured as
A plurality of the fitting part side protrusions or the fitting part side grooves are provided along the axial direction corresponding to the cylindrical part side grooves or the cylindrical part side protrusions, and a protrusion width or groove toward the rear side in the fitting direction. The conduit connection structure according to claim 1, wherein the conduit connection structure is configured to increase in width. The fitting portion is configured to be fitted onto the cylindrical portion,
A plurality of the cylindrical portion side grooves or the cylindrical portion side protrusions are provided along the axial direction, and the groove width or the protrusion width increases toward the rear side in the fitting direction when the fitting portion is externally fitted to the cylindrical portion. Configured to be
A plurality of the fitting part side protrusions or the fitting part side grooves are provided along the axial direction corresponding to the cylindrical part side grooves or the cylindrical part side protrusions, and the protrusion width or groove width toward the front side in the fitting direction. The conduit connection structure according to claim 1, wherein the conduit connection structure is configured to be large. An air cleaner device for introducing outside air into an intake system component of an internal combustion engine,
An air cleaner body connected to the intake system parts;
A duct part configured to introduce the outside air into the air cleaner body part;
With
5. The duct portion is connected to the air cleaner main body using the conduit connection structure according to claim 1, wherein the main body member is the air cleaner main body, the duct is the conduit. An air cleaner device that is configured to. An internal combustion engine configured to introduce outside air into an intake system component via an air cleaner device,
The air cleaner device includes an air cleaner main body connected to the intake system components, and a duct configured to introduce the outside air into the air cleaner main body.
5. The duct portion is connected to the air cleaner main body using the conduit connection structure according to claim 1, wherein the main body member is the air cleaner main body, the duct is the conduit. An internal combustion engine configured to be. A conduit connected to the body member,
It has a fitting part that is fitted or fitted into the cylindrical part of the main body member,
On the outer peripheral surface or inner peripheral surface of the fitting portion, an annular fitting portion side that engages with an annular cylindrical portion side groove or an annular cylindrical portion side protrusion provided on the inner peripheral surface or outer peripheral surface of the cylindrical portion Protrusions or annular fitting part side grooves are provided, and three axial notches extending in the direction along the axial direction of the fitting part from the tip of the fitting part are formed,
The three axial cutouts are arranged at equal intervals in the circumferential direction of the fitting portion. The fitting portion is configured to be fitted into the cylindrical portion,
A plurality of the fitting part side protrusions or the fitting part side grooves are provided along the axial direction corresponding to the cylindrical part side grooves or the cylindrical part side protrusions, and the fitting part is fitted into the cylindrical part. The conduit according to claim 7, wherein the protrusion width or the groove width is configured to increase toward the rear side in the fitting direction. The fitting portion is configured to be fitted onto the cylindrical portion,
A plurality of the fitting part side protrusions or the fitting part side grooves are provided along the axial direction corresponding to the cylindrical part side grooves or the cylindrical part side protrusions, and the fitting part is externally fitted to the cylindrical part. The conduit according to claim 7, wherein the width of the protrusion or the groove is increased toward the front side in the fitting direction at the time of fitting.

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