JP2017150341A - Intake device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake device for an internal combustion engine, having improved durability to a pressure fluctuation in an intake port even when a bearing member is mounted therein.SOLUTION: The intake device for the internal combustion engine includes a plurality of intake ports 2 neighboring each other via partition walls 11, valve elements 32 provided in the intake ports 2, respectively, a turning shaft 31 for turning together with the valve elements 32, and bearing members 50 arranged on the partition walls 11 for turnably supporting the turning shaft 31, the bearing members 50 each having an arm part 52 extending along the partition wall 11, and welded parts 52e, 11e fixing an end 52c of the arm part 52 to the partition wall 11.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an intake control device for an internal combustion engine.

  Patent Document 1 discloses an intake device body that includes a surge tank and a plurality of intake ports that branch downstream from the surge tank, a valve body that is provided for each intake port, and a pivot shaft that rotates the valve body. 1 shows a variable intake device for an internal combustion engine that is provided between adjacent intake ports and includes a bearing member that rotatably supports a rotation shaft. Here, when the valve body is turned to the closed state, the valve body is configured to abut against (seal) the opening (intake port) by abutting against the partition portion constituting the opening of the intake port. Further, the bearing member is fixed to the partition between the intake ports by being fitted into a concave (notched) bearing mounting portion formed in the partition between the intake ports of the intake device body. The intake device main body has a structure divided into a plurality of pieces, and a welding part is formed on each of the bearing member of the first piece, the upper surface side of the partition wall, and the lower surface side of the second piece, These pieces are joined by welding.

JP 2010-1847

  In the variable intake device of Patent Document 1, the pressure in the intake port rises because the welded portions provided on the upper surfaces of the bearing member and the partition of the first piece are welded to the second piece (for example, backfire). Pressure). Here, the bearing member is connected to the first piece in a fitted state. That is, by mounting the bearing member, a joint is generated between the bearing member and the partition wall, and the joint may be broken by pressure.

  Accordingly, the present invention has been made in view of the above circumstances, and an object thereof is to provide an intake device for an internal combustion engine that is improved in resistance to pressure fluctuations in an intake port even when a bearing member is mounted. And

  A characteristic configuration of the intake device according to the present invention includes a plurality of intake ports adjacent to each other via a partition wall, a valve body provided for each of the intake ports, a rotation shaft that rotates together with the valve body, and a partition wall. And a bearing member that rotatably supports the pivot shaft, and the bearing member includes an arm portion extending along the partition wall, and a welding portion that fixes the tip of the arm portion and the partition wall. It is in the point which has.

  With this configuration, since the arm portion and the partition wall are fixed by the welded portion, it is possible to prevent the arm portion (bearing member) from falling off the partition wall. Even if pressure (backfire pressure) or the like is generated in the intake port, the strength of the joint can be improved because the arm portion and the partition wall are fixed by the weld portion. As a result, it is possible to improve resistance to the pressure generated in the intake port.

  According to another characteristic configuration of the present invention, the welded portion can be fitted to the convex portion formed on one of the distal end of the arm portion or the bulkhead, and can be fitted to the convex portion. It has the recessed part formed so that it might be depressed in either one of the front-end | tips of the said arm part.

  With this configuration, the convex portion and the concave portion can be reliably welded by vibration welding or the like. As a result, it is possible to improve resistance to the pressure in the intake port.

  Another feature of the present invention is that the welded portion forms a gap between the convex portion and the concave portion in the direction in which the arm portion extends, and the convex portion and the convex portion in the direction in which the rotation shaft extends. The recess is in a point where it is fixed in contact.

  With this configuration, it is possible to form the recesses in the plurality of partition walls arranged in the rotation axis direction without requiring higher degree of dimensional accuracy. Further, since the position where the bearing member is mounted is defined by the rotation shaft in the direction in which the arm portion extends, the convex portion can be reliably fitted by forming the gap. In addition, since the convex portion and the concave portion are fixed in contact with each other in the direction in which the rotational shaft extends, vibration welding in the rotational shaft direction is facilitated. By these, an arm part and a partition can be integrated reliably and tolerance can be improved.

  In another feature of the present invention, the bearing member is made of resin, and is fixed in a state where it is welded to the first intake device body made of resin to which the bearing member is mounted, and the first intake device body. A resin-made second intake device main body, the bearing member being fixed to the first intake device main body, and the bearing member and the first intake device main body being fixed to the second intake device main body. It is in a point that is fixed in a welded state.

  With this configuration, since the bearing member is welded to the first intake device main body and the second intake device main body, it is possible to further improve resistance to the pressure generated in the intake device main body.

  Another feature of the present invention is that the convex portion is formed so as to be flush with an end surface of the arm portion on the second intake device main body side.

  With this configuration, the convex portion can be welded and fixed to both the first intake device body and the second intake device body. Thereby, tolerance can further be improved.

It is the disassembled perspective view which showed the structure of the intake device in 1st Embodiment. FIG. 2 is a schematic cross-sectional view along the intake port of the intake device in FIG. 1. It is an expansion perspective view which shows the peripheral part of the bearing member of the intake device in FIG. It is an expansion perspective view which shows the state which removed the bearing member in FIG. It is the perspective view which showed the bearing member in 1st Embodiment. It is a partial enlarged plan view which shows the fitting state of a convex part and a recessed part. It is the partial expanded sectional view which showed typically the shape of the cross section which passes through the welding part of a convex part and a recessed part.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  With reference to FIGS. 1-7, the structure of the intake device 100 by 1st Embodiment of this invention is demonstrated.

  As shown in FIG. 1 as an example, the intake device 100 is an intake device 100 provided in an in-line four-cylinder engine (not shown) for an automobile. The intake device 100 includes a surge tank 1, four intake ports 2 that are branched from the surge tank 1 and are arranged downstream of the surge tank 1, and intake control provided inside the four intake ports 2. And a valve 3. Structurally, the intake device 100 includes an intake device main body 101 that integrally includes the surge tank 1 and the four intake ports 2. The intake device body 101 is made of a resin material, for example, nylon 6 (PA6). As shown in FIGS. 1 and 2, the intake control valve 3 is provided inside the intake device main body 101. The intake device 100 is connected to a cylinder head 90 (see FIG. 2), and the four intake ports 2 are connected to each cylinder of the engine via the cylinder head 90, respectively.

  The intake device main body 101 includes three main body portions 4a to 4c. In the main body portions 4a to 4c, welded portions are formed along the joint portions. Then, with the intake control valve 3 mounted on the main body portion 4a, the main body portion 4b is integrated with the main body portion 4a from the upper surface side of the main body portion 4a, and the main body portion 4c is integrated with the main body portion 4a from the lower surface side of the main body portion 4a. Are joined together. For convenience of explanation, as shown in FIG. 1, the Z1 direction on the main body portion 4b side is defined as the upper side, and the Z2 direction on the main body portion 4c side is defined as the lower side. The main body portion 4a and the main body portion 4b are examples of the “first intake device main body” and the “second intake device main body” of the present invention, respectively.

  More specifically, the main body portion 4 a is formed with a line-shaped first welded portion 13 extending along the partition wall 11 and the outer wall 12 between the four intake ports 2 on the upper end surfaces of the partition wall 11 and the outer wall 12. Further, a second weld portion in a line shape is provided on the main body portion 4b above the main body portion 4a so as to be welded to the first weld portion 13 and to extend along the partition wall 11 and the outer wall 12 between the intake ports 2. 14 is formed on the lower end surfaces of the partition wall 11 and the outer wall 12. By joining the main body portion 4a (first welded portion 13) and the main body portion 4b (second welded portion 14), the space between the main body portion 4a and the main body portion 4b of the four intake ports 2 is increased. The part of is composed. The joining of the main body part 4c and the main body part 4a is the same, and the corresponding welding parts are joined to each other to constitute the intake device main body 101. The first welding part 13 and the second welding part 14 are both examples of the “main body side welding part” of the present invention.

  As shown in FIG. 1, the intake air reaching the surge tank 1 through an air cleaner and a throttle (not shown) flows from the inlet 1a. The four intake ports 2 are arranged side by side in the horizontal direction (X direction) so as to be adjacent to each other via the partition wall 11. As shown in FIG. 2, each of the four intake ports 2 is connected to the engine port on the downstream side of the first port portion 21 and the second port portion 22 and the first port portion 21 and the second port portion 22. And an outlet port portion 23. The first port portion 21 extends so as to bypass the surge tank 1 and is connected to the outlet port portion 23 on the downstream side. The second port portion 22 is provided so as to connect the surge tank 1 and the outlet port portion 23 via the intake control valve 3.

  Further, the intake control valve 3 is configured to open and close an opening 24 located at a connection portion between the second port portion 22 and the outlet port portion 23. When the intake control valve 3 is closed (shown in FIG. 2), a long port having a long intake path length is formed by the first port portion 21 and the outlet port portion 23, and the intake control valve 3 is opened (not shown). Then, a short port having a small intake path length is formed by the second port portion 22 and the outlet port portion 23. Thus, the intake control valve 3 is configured to be able to change the intake path length. That is, the intake control valve 3 functions as an intake control valve for a variable intake valve that changes the intake path length to each cylinder of the engine by opening and closing the opening 24.

  As shown in FIG. 1, the intake control valve 3 includes a rotation shaft 31 that rotates together with the valve body 32, four valve bodies 32 that open and close the second port portion 22 (opening 24), and a rotation shaft 31. And the bearing member 50 and the end bearing member 60 that rotatably support the rotation shaft 31 and the valve body 32. The actuator 33 is a negative pressure actuator that generates a driving force by supplying negative pressure. The valve element 32 is an example of the “variable intake valve element” in the present invention.

  The rotation shaft 31 is formed of a metal square shaft that extends in a lateral direction orthogonal to the intake port 2 (a direction in which the four intake ports 2 are arranged) and penetrates the four second port portions 22. The rotating shaft 31 is rotatably held at both ends by two end bearing members 60 disposed at the end bearing mounting portion 80 of the outer wall 12 and is disposed at the bearing mounting portion 70 of the partition wall 11. The center part is rotatably supported by three bearing members 50. Moreover, below, let the axial direction where the rotating shaft 31 extends be an X direction.

  In the present embodiment, the valve body 32 is a variable intake valve valve body that is provided so as to change the length of the intake port 2 by opening and closing the opening 24 between the surge tank 1 and the intake port 2. is there. A total of four valve bodies 32 are provided for each of the four intake ports 2. The valve body 32 is made of a resin plate-like member and has a substantially rectangular outer shape corresponding to the opening 24. In addition, the valve body 32 is configured such that the four valve bodies 32 rotate integrally with the rotation shaft 31 by inserting the rotation shaft 31 into the shaft insertion portion 32a that crosses the central portion in the longitudinal direction in the X direction. Is attached to the rotation shaft 31. Both ends of the shaft insertion portion 32a protrude outward in the axial direction (X direction), and are inserted rotatably by bearing members 50 or end bearing members 60 arranged at both ends of the valve body 32, respectively. Thus, the individual valve bodies 32 are rotatably held by the bearing members (the bearing member 50 and the end bearing member 60), and the rotating shaft 31 is also supported by the bearing members via the individual valve bodies 32. Has been.

  A rubber seal lip 32 b is provided on the peripheral edge of the valve body 32. On the other hand, the opening 24 of the intake port 2 is formed with a seal surface 25 that contacts the valve body 32 in the closed state. Since the seal lip 32b of the valve body 32 and the seal surface 25 of the intake port 2 (opening 24) are in contact with each other, the airtightness of the opening 24 in the closed state of the valve body 32 is improved. The intake control valve 3 is configured to simultaneously open and close the opening 24 in all four intake ports 2 by rotating the rotation shaft 31 to rotate the four valve bodies 32 at once. ing.

  The bearing member 50 is made of resin and is disposed between the adjacent intake ports 2 and is configured to rotatably support the rotation shaft 31 and the shaft insertion portion 32a of the valve body 32. In the present embodiment, a total of three bearing members 50 are respectively provided between the adjacent intake ports 2. As shown in FIG. 1, the two end bearing members 60 at both ends of the rotating shaft 31 are fixed by being inserted into end bearing mounting portions 80 formed on the outer wall 12 of the intake device main body 101, respectively. Has been.

  As shown in FIGS. 3 and 4, the three bearing members 50 are fixed by being inserted into bearing mounting portions 70 formed in the partition wall 11 between the adjacent intake ports 2 (second port portions 22). It is comprised so that it may be attached to. FIG. 3 shows a state where only the bearing member 50 is mounted on the bearing mounting portion 70 for convenience.

  As shown in FIG. 5, the bearing member 50 is a resin member and is made of the same type of material as the intake device main body 101 (for example, nylon 6 (PA6)). The bearing member 50 includes a bearing body 51 having a U shape when viewed from the axial direction X (thickness direction), and an arm portion 52 protruding from the bearing body 51. The bearing body 51 has a bearing hole 53a that rotatably supports the rotation shaft 31. As shown in FIG. 3, the arm portion 52 extends from the bearing body 51 along the partition wall 11 between the adjacent intake ports 2 and constitutes a bearing-side welded portion 56 described later. In the following, the direction along the partition wall 11 between the adjacent intake ports 2 (longitudinal direction of the bearing member 50 (arm portion 52)) is defined as the A direction. Further, in order to distinguish from the vertical direction (Z direction) of the entire apparatus, the upper surface side (B1 side where the bearing side welded portion 56 is provided) and the lower surface side (B2 opposite to the bearing side welded portion 56) of the bearing member 50 are used. The direction toward (side) is called the B direction.

  As shown in FIG. 5, the bearing body 51 includes a cylindrical portion 53 in which the bearing hole 53 a is formed, a flange portion 54 formed on the outer peripheral surface of the U-shaped bearing body 51, and the bearing body 51. And positioning corners 55 formed on the steps. The cylindrical portion 53 is a cylindrical portion that protrudes in the X direction, which is the thickness direction of the bearing body 51, and the inner surface side is a bearing hole 53 a. The rotation shaft 31 is inserted into the bearing hole 53a together with the shaft insertion portion 32a of the valve body 32, and is supported rotatably.

  The flange portion 54 is formed in a flange shape (a plate shape standing upright from the outer periphery surface) on the outer peripheral surface excluding the upper surface 51 a of the bearing body 51. Although detailed illustration is omitted, a pair (two) of the flange-shaped portions 54 are arranged on the outer peripheral surface of the bearing body 51 with a slight gap in the axial direction X. The corner portion 55 is a rectangular portion that is formed on the upper side of the tubular portion 53 so as to protrude on both sides in the longitudinal direction. The corner portions 55 are respectively provided on both sides of the bearing body 51 in the X direction.

  The arm portion 52 is formed at the upper end portion of the bearing body 51 and has a plate shape. The arm portions 52 are formed so as to extend from the side end portions 51 b at both ends of the bearing body 51 to both sides in the direction along the partition wall 11 between the intake ports 2 (longitudinal direction A). As shown in FIG. 6, the arm portion 52 is formed to extend from the bearing body 51 along the partition wall 11 between the intake ports 2 adjacent to each other with a length larger than the inner diameter d of the bearing hole 53 a. That is, the arm portion 52 has a length L1 (52a side) and a length L2 (52b side) in the longitudinal direction A, and the lengths L1 and L2 are larger than the inner diameter d of the bearing hole 53a.

  Moreover, in this embodiment, the arm part 52 is formed so that it may extend in the length over the formation range of the seal surface 25 along the partition 11 between the intake ports 2. Specifically, as shown in FIG. 3, the sealing surface 25 of the intake port 2 is formed in a circumferential shape so as to surround the opening 24 of the second port portion 22 where the valve body 32 is disposed. The arm portion 52 extends over the entire length of the formation range (side along the A direction of the seal surface 25) along the partition wall 11 between the intake ports 2 in the seal surface 25 surrounding the opening 24. . That is, the length L1 (52a side) and the length L2 (52b side) of the arm portion 52 are substantially equal to the lengths L3 and L4 of the formation range of the seal surface 25 along the A direction, respectively. Since the seal surface 25 surrounds the opening 24, the total length L5 (see FIG. 5) of the bearing member 50 including the arm portion 52 and the bearing body 51 extending on both sides in the longitudinal direction A is the longitudinal direction A. It can also be said that it is substantially equal to the length of the opening part 24 along. That is, the pair of arm portions 52 extending on both sides in the longitudinal direction A are formed so as to extend to the vicinity of both ends of the opening 24 in the longitudinal direction A, respectively.

  Further, as shown in FIG. 5, the end portion 52 c of the arm portion 52 is formed with a convex portion 52 d that protrudes in the same direction as the direction in which the arm portion 52 extends. The convex portion 52d is formed to protrude so as to form the same plane as the upper surface (B1 side) of the arm portion 52. Further, the width in the horizontal direction (X direction) of the convex portion 52 d is formed to be smaller than the width of the arm portion 52. The convex portion 52d is fitted into a concave portion 11d formed in the partition wall 11 to be described later, and two planes formed toward the lateral direction (X direction) become the convex portion-side welded portion 52e.

  Further, as shown in FIG. 5, the bearing-side welded portion 56 is formed over the entire length in the longitudinal direction A on the upper surface (B1 side) of the arm portion 52. The bearing-side welded portion 56 is also formed on the upper surface 51 a of the bearing body 51. The arm 52 extends continuously with the upper surface 51 a of the bearing body 51 and is provided so as to form one bearing-side welded portion 56 that is continuous with the upper surface 51 a of the bearing body 51. The bearing-side welded portion 56 is also formed on the upper surface of the convex portion 52d. In the present embodiment, the bearing-side welded portion 56 is formed so as to extend over the entire length in the longitudinal direction A of the bearing member 50 including the bearing main body 51, the arm portion 52, and the convex portion 52d. And as shown in FIG. 3, the arm part 52 which comprises the bearing side welding part 56 of the bearing member 50 is formed so that it may continue with the 1st welding part 13 of the main-body part 4a. The bearing-side welded portion 56 is formed in a rib shape protruding from the upper surface and extends in the longitudinal direction A in the same manner as the first welded portion 13 on the main body side.

  As shown in FIG. 4, the bearing mounting portion 70 to which the bearing member 50 is mounted is disposed between the four intake ports 2 (second port portion 22) in the intake device main body 101 (main body portion 4a). Each of the three partition walls 11 is provided.

  The bearing mounting portion 70 is formed in the partition wall 11 near the opening 24 in the partition wall 11 of the intake port 2 and has a concave shape corresponding to the outer shape of the bearing member 50. Specifically, the bearing mounting portion 70 includes a main body insertion portion 71 into which the bearing main body 51 is inserted, a fitting concave portion 72 in which the arm portion 52 is disposed, and a convex portion formed on the end portion 52 c of the arm portion 52. And a recess 11d into which 52d is fitted.

  The main body insertion portion 71 includes a U-shaped insertion hole portion 74 into which the cylindrical portion 53 of the bearing main body 51 is inserted, a seal groove portion 75 into which a pair of flange portions 54 are inserted, and a U-shaped insertion hole portion. And a stepped portion 76 projecting from the upper end of 74 in the A direction. The insertion hole portion 74 is formed so as to penetrate the three partition walls 11 in the axial direction X in order to support the cylindrical portion 53 in a state where the rotating shaft 31 (the shaft insertion portion 32a) is inserted into the bearing hole 53a. Has been. The outer peripheral surface (lower half) of the cylindrical portion 53 is supported in contact with the inner peripheral surface of the U-shaped insertion hole 74.

  The seal groove 75 is formed so that the tip has a tapered shape. When the pair of flange portions 54 of the bearing body 51 are inserted into the seal groove portion 75, the tip portion of the flange portion 54 comes into contact with the tapered inner surface portion of the seal groove portion 75 and is bent inward in the thickness direction (X direction). . As a result, the contact state between the flange-shaped portion 54 and the inner surface of the partition wall 11 (the inner wall surface of the seal groove portion 75) is ensured, and airtightness is ensured in the portion partitioned by the bearing body 51 between the adjacent intake ports 2. Is done. Further, the stepped portion 76 is formed to correspond to the corner portion 55 of the bearing body 51. The end surface (each end surface in the A direction and the B direction) of the stepped portion 76 and the corner portion 55 of the bearing main body 51 come into contact with each other, whereby the rotation shaft 31 in the mounted state of the bearing member 50 (see FIG. 3). The center position is positioned.

  The fitting recess 72 of the bearing mounting portion 70 is formed on the upper surface of the partition wall 11 between the intake ports 2 so as to correspond to the arm portion 52 of the bearing member 50, and is configured to fit the arm portion 52. Yes. That is, the fitting concave portion 72 is formed in a concave shape that is substantially the same as the outer shape of the arm portion 52 in plan view. In a state where the arm portion 52 is fitted in the fitting recess 72, the arm portion 52 is supported and positioned by the inner side surface of the partition wall 11 constituting the fitting recess 72. The fitting recess 72 is formed on both sides in the longitudinal direction A corresponding to the arm portions 52 (52a and 52b) extending from the bearing body 51 to both sides in the longitudinal direction A. The individual fitting recesses 72 differ only in the length in the longitudinal direction A, and have the same configuration.

  As shown in FIG. 4, the fitting recess 72 has a side surface constituted by the wall-like portion 11 a of the partition wall 11 and a bottom surface constituted by the pedestal portion 11 b of the partition wall 11. The wall-like portion 11a of the partition wall 11 is formed so as to surround the periphery (longitudinal direction A and axial direction X) of the arm portion 52, and the end surface on the longitudinal direction A side and the end surface on the axial direction X side of the arm portion 52 Abut. Moreover, the base part 11b is a flat part of the level | step-difference part formed in the position dented in the lower side (B2 side) from the upper end surface of the wall-shaped part 11a. The pedestal portion 11 b is formed in a rectangular ring shape along the wall-shaped portion 11 a surrounding the arm portion 52.

  When the bearing portion welded portion 56 of the arm portion 52 and the convex portion 52d is joined by vibration welding, the arm portion 52 and the convex portion 52d are pressed against the bearing side welded portion 56 from the upper surface side (B1 side). At the same time, the object to be welded (welding part on the main body part 4b side), the arm part 52, and the convex part 52d are relatively moved (vibrated) within the welding surface. For this reason, the wall-shaped part 11a determines the position (position of the longitudinal direction A and the axial direction X) of the arm part 52 and the convex part 52d in the upper surface of the partition 11, and also arrange | positions the arm part 52 and the convex part 52d in plane. Has the function of fixing. Moreover, the base part 11b has a function which supports the arm part 52 and the convex part 52d with respect to the pressing force applied from the upper surface side of the arm part 52 and the convex part 52d.

  As shown in FIG. 1, when the intake control valve 3 is assembled to the main body portion 4 a, each bearing member 50 is inhaled while the four valve bodies 32 and the bearing members 50 are mounted on the rotating shaft 31. It is mounted on the bearing mounting portion 70 between the ports 2. At this time, the bearing main body 51 is inserted into the main body insertion portion 71 as shown in FIG. 3 or 4, and the convex portion 52 d formed on the end portion 52 c of the arm portion 52 is fitted into the concave portion 11 d of the partition wall 11. The arm 52 is positioned and fixed. Here, the arm portion 52 may be positioned by being fitted into the fitting recess 72.

  As shown in FIG. 6, the convex portion side welded portion 52e of the concave portion 11d and the concave portion side welded portion 11e of the concave portion 11d are fitted so as to be in close contact with each other. It is desirable that the convex portion-side welded portion 52e and the concave portion-side welded portion 11e are fitted by press fitting or the like so that the gap is zero. Further, the gap H in the direction in which the arm portion 52 extends as shown in FIG. 6 is a gap generated due to variation in the dimensions of the convex portion 52d (arm portion 52) and the concave portion 11d (partition wall 11). The convex portion-side weld portion 52e and the concave portion-side weld portion 11e are welded in close contact with each other. Thereby, the convex part 52d and the recessed part 11d are fixed. That is, the bearing member 50 and the main body portion 4a are welded.

  In the state where each bearing member 50 is mounted on the bearing mounting portion 70, as shown in FIG. 3, the first welded portion 13 of the partition wall 11 itself, the bearing body 51, the arm portion 52, and the convex portion 52d of the bearing member 50 are provided. Are connected to the bearing-side welded portion 56, and a series of weld rib lines are formed on the upper surface of the partition wall 11 between the intake ports 2. That is, in the partition wall 11 of the main body portion 4a, the first welded portion 13 is not formed in the formation portion of the bearing mounting portion 70 (see FIG. 4), and the bearing portion 50 is mounted on the bearing mounting portion 70. The welding line which consists of the 1st welding part 13 and the bearing welding part 56 is comprised.

  Next, the main body portion 4a on which the bearing member 50 is mounted and the main body portion 4b are joined by vibration welding. As a result, the bearing-side welded portion 56 is welded to the second welded portion 14 (see FIG. 1) of the main body portion 4b together with the first welded portion 13 of the partition wall 11, and is fixed to the main body portion 4b. Thereby, the arm part 52, the convex part 52d, and the main body part 4a (the upper surface of the partition wall 11) of the bearing member 50 are welded to the main body part 4b in a state where the bearing member 50 is mounted on the main body part 4a. At this time, as shown in FIG. 7, the convex portion side welded portion 52e of the convex portion 52d and the concave portion side welded portion 11e of the concave portion 11d are joined by welding, and the upper surface (56 (52d) and 56 (shown in FIG. 7) 11)) forms the same plane, and the second welded portion 14 of the main body portion 4b, the bearing-side welded portion 56 of the convex portion 52d, and the bearing-side welded portion 56 of the partition wall 11 are joined by vibration welding.

  In the present embodiment, the following effects can be obtained.

  In the present embodiment, the bearing member 50 and the main body portion 4a can be integrated by fitting and welding the convex portion 52d and the concave portion 11d. Thereby, even if it is the structure which provides the bearing member 50 in the partition 11 between the adjacent intake ports 2, even if the pressure in the intake port 2 rises, the tolerance with respect to a pressure can be improved. Further, a welded portion (convex portion-side weld portion 52e, concave portion-side weld portion 11e) is provided in the direction in which the rotation shaft 31 extends in the convex portion 52d and the concave portion 11d, and the convex portion 52d and the concave portion in the direction in which the arm portion 52 extends. Since the gap H is formed with 11d, a high dimensional accuracy is not required for the dimension in the direction in which the convex part 52d and the arm part 52 of the concave part 11d extend. Thereby, a welding part can be formed, suppressing the manufacturing cost of the convex part 52d and the recessed part 11d. Furthermore, since the main body portion 4b is joined by vibration welding to a portion where the convex portion 52d and the concave portion 11d are welded, resistance to pressure can be further improved.

  In the present embodiment, the fitting recess 72 is formed so as to be substantially the same as the outer shape of the arm portion 52 in plan view, but the protrusion-side weld portion 52e and the recess-side weld portion 11e are connected to each other. Since it forms so that it may closely_contact | adhere, it is not necessary to maintain the length precision of the longitudinal direction A of the fitting recessed part 72, and the dimensional accuracy of a horizontal width (X direction) highly. As a result, the bearing member 50 can be mounted while suppressing the manufacturing cost of the fitting recess 72.

  In the present embodiment, the convex portion-side weld portion 52e and the concave portion-side weld portion 11e are formed so as to be in close contact with each other, and a gap H is formed between the convex portion 52d and the concave portion 11d in the direction in which the arm portion 52 extends. Therefore, for example, even if the dimensional accuracy such as the roundness and the coaxiality of the rotation shaft 31 is lowered, the bearing member 50 can be securely fitted into the partition wall 11.

  Further, in the above-described embodiment, the configuration in which the protrusion 52d is provided in the arm portion 52 of the bearing member 50 of the present invention and the recess 11d is provided in the partition wall 11d has been described. Alternatively, the protrusions 52d may be integrated.

  Moreover, in the said embodiment, the length L1 (52a side) and length L2 (52b side) of the arm part 52 are examples substantially equal to the length L3 and L4 of the formation range of the seal surface 25 along the A direction, respectively. However, it may not be the same. That is, the lengths L1 and L2 may be shortened. Further, the lengths of L1 and L2 may be longer than those of L3 and L4.

  Moreover, in the said embodiment, although the example which applied the intake device 100 provided with the bearing member 50 of this invention to the in-line 4-cylinder engine for motor vehicles was shown, this invention is not limited to this. The intake device 100 including the bearing member 50 of the present invention is applied to an airflow control valve structure of an internal combustion engine other than an automobile engine (for example, a gas engine other than a gasoline engine (an internal combustion engine such as a diesel engine and a gas engine)). You may do it. Further, the present invention may be applied to an airflow control valve structure such as a V-type cylinder engine or a horizontally opposed engine other than the in-line four-cylinder engine regardless of whether it is a gasoline engine. Further, the present invention may be applied to an airflow control valve structure of an internal combustion engine that is installed as a drive source (power source) for equipment as well as an automobile.

1 Surge Tank 11 Partition 11d Recess 11e Recess Side Welding Portion (Welding Portion)
13 First Welding Portion 2 Intake Port 3 Intake Control Valve 31 Rotating Shaft 32 Valve Element 33 Actuator 4a Main Body (First Intake Device Main Body)
4b Body part (second air intake device body)
50 Bearing member 51 Bearing body 52 Arm portion 52c End portion 52d Convex portion 52e Convex portion side welded portion (welded portion)
56 Bearing-side welded portion 90 Cylinder head 100 Intake device 101 Intake device body

Claims (5)

A plurality of intake ports adjacent to each other via a partition;
A valve body provided for each intake port;
A rotating shaft that rotates together with the valve body;
A bearing member disposed on the partition wall and rotatably supporting the rotation shaft;
The bearing member includes an arm portion extending along the partition;
An intake device for an internal combustion engine, comprising: a weld portion that fixes an end portion of the arm portion and the partition wall. The welded portion is a convex portion formed to project to one of the end portion of the arm portion or the partition, and
2. The intake device for an internal combustion engine according to claim 1, further comprising: a concave portion that can be fitted to the convex portion and is formed so as to be recessed in either the partition wall or the tip of the arm portion.   The welded portion is fixed in a state in which a gap is formed between the convex portion and the concave portion in a direction in which the arm portion extends, and the convex portion and the concave portion are in contact with each other in a direction in which the rotation shaft extends. An intake device for an internal combustion engine according to claim 1 or 2. The bearing member is made of resin,
A resin-made first intake device main body to which the bearing member is mounted;
A resin-made second intake device main body fixed in a welded state with the first intake device main body,
The bearing member is fixed in a state where it is welded to the first intake device body, and the bearing member and the first intake device body are fixed in a state where they are welded to the second intake device body. The intake device for an internal combustion engine according to any one of claims 3 to 4.   The intake device for an internal combustion engine according to any one of claims 1 to 4, wherein the convex portion is formed so as to be flush with an end surface of the arm portion on the second intake device main body side.

Images