JP6645250B2 - Intake device for internal combustion engine - Google Patents

Description

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

  Patent Literature 1 discloses an intake device main body including a surge tank and a plurality of intake ports branched downstream from the surge tank, a valve element provided for each intake port, and a rotation shaft for rotating the valve element. And a bearing member arranged between adjacent intake ports and rotatably supporting a rotation shaft. Here, when the valve body is rotated to the valve closed state, the valve body is configured to abut on the partition wall portion forming the opening of the intake port to close (seal) the opening (intake port). The bearing member is fixed to the partition wall between the intake ports by being fitted into a concave (notched) bearing mounting portion formed in the partition wall between the intake ports of the intake device body. The suction device body has a structure divided into a plurality of pieces, and a welding portion 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 A

  In the variable intake device disclosed in Patent Document 1, the pressure in the intake port is increased because the bearing member and the first piece are welded to the second piece at welding portions provided on the upper surfaces of the partition walls of the first piece (for example, backfire). Pressure etc.). 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.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an intake device for an internal combustion engine that has improved 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, a valve element provided for each of the intake ports, a rotating shaft that rotates together with the valve element, and an arrangement on the partition. A bearing member rotatably supporting the rotating shaft, the bearing member including an arm extending along the partition, and a welding portion for fixing a tip of the arm and the partition. have a said weld portion includes a protruding portion formed to protrude on one at either end or the partition wall of the arm portion is engageable to the convex portion, of the partition wall or the arm portion And a recess formed so as to be depressed at one of the other ends .

According to this configuration, since the arm and the partition are fixed by the welded portion, it is possible to prevent the arm (the bearing member) from falling off the partition. Further, even if pressure (backfire pressure) or the like is generated in the intake port, the joint portion can be improved because the arm portion and the partition wall are fixed by the welded portion. As a result, resistance to pressure generated in the intake port can be improved.
Further, the projection and the recess can be reliably welded by vibration welding or the like. Thereby, the resistance to the pressure in the intake port can be improved.

  Another characteristic configuration of the present invention is that the welding portion forms a gap between the convex portion and the concave portion in a direction in which the arm portion extends, and the convex portion and the convex portion in a direction in which the rotation axis extends. The concave portions are fixed in a contact state.

  According to this configuration, a recess can be formed in a plurality of partition walls arranged in the rotation axis direction without requiring higher dimensional accuracy. In addition, since the position at which the bearing member is mounted in the direction in which the arm portion extends is defined by the rotation shaft, the projection can be securely fitted by forming a gap. In addition, in the direction in which the rotating shaft extends, the convex portion and the concave portion are fixed in contact with each other. Thus, the arm portion and the partition can be surely integrated, and the durability can be improved.

  According to another characteristic configuration of the present invention, the bearing member is made of resin, and is fixed in a state in which the first intake device body made of resin to which the bearing member is attached is welded to the first intake device body. A second resin body made of a resin, the bearing member being fixed to the first gas generator body in a welded state, wherein the bearing member and the first gas generator body are connected to the second gas generator body. It is fixed in a state where it is welded.

  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 pressure generated in the intake device main body.

  Another characteristic configuration 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 side of the second intake device body.

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

FIG. 2 is an exploded perspective view illustrating a configuration of the intake device according to the first embodiment. FIG. 2 is a schematic sectional view taken along an intake port of the intake device in FIG. 1. FIG. 2 is an enlarged perspective view illustrating a peripheral portion of a bearing member of the intake device in FIG. 1. FIG. 4 is an enlarged perspective view showing a state where a bearing member in FIG. 3 is removed. FIG. 2 is a perspective view illustrating a bearing member according to the first embodiment. FIG. 4 is a partially enlarged plan view showing a fitting state between a convex portion and a concave portion. It is the partial expanded sectional view which showed typically the shape of the cross section which passes the welding part of a convex part and a concave part.

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

  The configuration of the intake device 100 according to the first embodiment of the present invention will be described with reference to FIGS.

  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 branched from the surge tank 1 and 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 integrally including a surge tank 1 and four intake ports 2. The intake device main body 101 is made of a resin material, for example, nylon 6 (PA6). As shown in FIGS. 1 and 2, an 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 the respective cylinders of the engine via the cylinder head 90.

  The intake device main body 101 includes three main body portions 4a to 4c. In the main body portions 4a to 4c, welding portions are formed along the respective joint portions. Then, with the intake control valve 3 attached to the main body portion 4a, the main body portion 4b is integrated with the main body portion 4a by vibration welding from the upper surface side of the main body portion 4a and the main body portion 4c 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 an upper direction, and the Z2 direction on the main body portion 4c side is defined as a lower direction. The main body portion 4a and the main body portion 4b are examples of the “first air intake device main body” and the “second air intake device main body” of the present invention, respectively.

  More specifically, a linear first welded portion 13 extending along the partition wall 11 and the outer wall 12 between the four intake ports 2 is formed on the upper end surfaces of the partition wall 11 and the outer wall 12 in the main body portion 4a. In addition, a line-shaped second welding portion provided on the main body portion 4b on the upper side of the main body portion 4a and provided so as to extend along the partition wall 11 and the outer wall 12 between the intake ports 2 while being welded to the first welding portion 13. 14 is formed on the lower end surfaces of the partition wall 11 and the outer wall 12. The main body portion 4a (the first welded portion 13) and the main body portion 4b (the second welded portion 14) are joined to each other, so that the space between the main body portion 4a and the main body portion 4b of the four intake ports 2 is formed. Is configured. The same applies to the joining of the main body portion 4c and the main body portion 4a, and the corresponding welding portions are joined to each other to form the intake device main body 101. The first welded portion 13 and the second welded portion 14 are both examples of the “body-side welded portion” of the present invention.

  As shown in FIG. 1, intake air that reaches via a not-shown air cleaner and a throttle flows into the surge tank 1 from an inlet 1a. The four intake ports 2 are arranged side by side in the lateral direction (X direction) so as to be adjacent to each other with the partition wall 11 interposed therebetween. As shown in FIG. 2, each of the four intake ports 2 is connected to a first port portion 21 and a second port portion 22 and to a cylinder of the engine downstream of the first port portion 21 and the second port portion 22. And an outlet port 23 to be provided. The first port 21 extends to bypass the surge tank 1 and is connected to the downstream outlet port 23. The second port 22 is provided to connect the surge tank 1 and the outlet port 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 22 and the outlet port 23. When the intake control valve 3 is closed (shown in FIG. 2), a long port having a large 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). In the embodiment, the second port portion 22 and the outlet port portion 23 form a short port having a small intake path length. Thereby, 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 length of the intake path 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 rotating shaft 31 that rotates together with the valve body 32, four valve bodies 32 that open and close the second port portion 22 (the opening 24), and a rotating shaft 31. , And a bearing member 50 and an end bearing member 60 that rotatably support the rotating shaft 31 and the valve body 32. The actuator 33 is a negative pressure actuator that generates a driving force by supplying a negative pressure. The valve body 32 is an example of the “valve body for variable intake valve” of the present invention.

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

  In the present embodiment, the valve body 32 is a variable intake valve body provided 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 formed of a resin plate member and has a substantially rectangular outer shape corresponding to the opening 24. Also, the four shafts 32 of the valve bodies 32 rotate integrally with the shafts 31 by inserting the rotation shafts 31 into the shaft insertion portions 32 a crossing the central portion in the longitudinal direction in the X direction. Is mounted on the rotating shaft 31. Both ends of the shaft insertion portion 32a protrude outward in the axial direction (X direction), and are rotatably inserted by bearing members 50 or end bearing members 60 disposed at both ends of the valve body 32, respectively. Thereby, each valve body 32 is rotatably held by the bearing member (the bearing member 50 and the end bearing member 60), and the rotating shaft 31 is also supported by the bearing member via each valve body 32. Have been.

  A sealing lip 32b made of rubber is provided on a peripheral portion 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 comes into contact with the valve body 32 in the closed state. 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, thereby improving the airtightness of the opening 24 when the valve 32 is closed. The intake control valve 3 is configured to simultaneously open and close the opening 24 in all four intake ports 2 by rotating the rotating shaft 31 and rotating the four valve bodies 32 collectively. ing.

  The bearing member 50 is made of resin, is arranged between the adjacent intake ports 2, and is configured to rotatably support the rotation shaft 31 of the valve body 32 and the shaft insertion portion 32 a. In the present embodiment, a total of three bearing members 50 are 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. Have 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 configured to 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 material as the intake device main body 101 (for example, nylon 6 (PA6)). The bearing member 50 includes a bearing main body 51 having a U-shape when viewed from the axial direction X (thickness direction), and an arm 52 protruding from the bearing main body 51. The bearing main body 51 has a bearing hole 53a that rotatably supports the rotating shaft 31. As shown in FIG. 3, the arm 52 extends from the bearing main 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 11 between the adjacent intake ports 2 (the longitudinal direction of the bearing member 50 (the arm portion 52)) is defined as the A direction. Further, in order to distinguish the entire device from the vertical direction (Z direction), the upper surface side (B1 side on which 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. Direction) is called direction B.

  As shown in FIG. 5, the bearing body 51 includes a cylindrical portion 53 having the bearing hole 53 a formed therein, a flange portion 54 formed on the outer peripheral surface of the U-shaped bearing body 51, and a bearing body 51. And a corner 55 for positioning formed on the step. The cylindrical portion 53 is a cylindrical portion protruding in the X direction, which is the thickness direction of the bearing body 51, and has a bearing hole 53a on the inner surface side. 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 rotatably supported.

  The flange portion 54 is formed in a flange shape (a plate shape standing upright from the outer peripheral surface) on the outer peripheral surface of the bearing main body 51 except the upper surface 51a. Although not shown in detail, a pair (two) of the flange portions 54 are arranged on the outer peripheral surface of the bearing main body 51 at a slight interval in the axial direction X. The corner portion 55 is a rectangular portion formed to protrude on both sides in the longitudinal direction above the tubular portion 53. The corner portions 55 are respectively provided on both sides of the bearing body 51 in the X direction.

  The arm 52 is formed at the upper end of the bearing main body 51 and has a plate-like shape. The arm portions 52 are formed so as to extend from the side end portions 51b 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 adjacent intake ports 2 with a length larger than the inner diameter d of the bearing hole 53a. That is, the arm 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 each larger than the inner diameter d of the bearing hole 53a.

  Further, in the present embodiment, the arm portion 52 is formed so as to extend over a range over the formation range of the seal surface 25 along the partition wall 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 element 32 is disposed. The arm portion 52 extends over a substantially entire length of a formation range (a side along the direction A of the seal surface 25) of the seal surface 25 surrounding the opening 24 along the partition wall 11 between the intake ports 2. . 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 sealing surface 25 surrounds the opening 24, the entire 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 corresponds to the longitudinal direction A. Can be rephrased to be substantially equal to the length of the opening 24 along. That is, the pair of arms 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, a protrusion 52d is formed on the end 52c of the arm 52 so as to project in the same direction as the direction in which the arm 52 extends. The convex portion 52d is formed so as to protrude so as to form the same plane as the upper surface (the B1 side) of the arm portion 52. The width of the convex portion 52d in the horizontal direction (X direction) 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 11 to be described later, and two flat surfaces formed toward the lateral direction (X direction) serve as a convex portion-side welded portion 52e.

  As shown in FIG. 5, a bearing-side welded portion 56 is formed on the upper surface (B1 side) of the arm portion 52 over the entire length in the longitudinal direction A. Note that a bearing-side welded portion 56 is also formed on the upper surface 51a of the bearing body 51. The arm portion 52 is provided so as to extend continuously with the upper surface 51a of the bearing main body 51 and constitute one bearing-side welded portion 56 which is continuous with the upper surface 51a of the bearing main 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. Then, as shown in FIG. 3, the arm 52 constituting the bearing-side welded portion 56 of the bearing member 50 is formed so as to be continuous with the first welded portion 13 of the main body portion 4a. Note that the bearing-side welded portion 56 is formed in a rib shape protruding from the upper surface similarly to the first welded portion 13 on the main body side, and extends on the line in the longitudinal direction A.

  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 (the second port portions 22) in the intake device main body 101 (the main body portion 4a). Each of the three partitions 11 is provided.

  The bearing mounting portion 70 is formed in the partition 11 near the opening 24 in the partition 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 arranged, and a convex portion formed at the end portion 52c of the arm portion 52. 52d includes a recess 11d to be fitted.

  The main body insertion portion 71 includes a U-shaped insertion hole 74 into which the cylindrical portion 53 of the bearing body 51 is inserted, a seal groove 75 into which the pair of flanges 54 are inserted, and a U-shaped insertion hole. 74 includes a stepped portion 76 projecting in the A direction from the upper end portion. 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. Have 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 such that the tip is tapered. When the pair of flanges 54 of the bearing body 51 are inserted into the seal groove 75, the distal end portion of the flange 54 comes into contact with the tapered inner surface of the seal groove 75 and is bent inward in the thickness direction (X direction). . Thereby, the contact state between the flange portion 54 and the inner surface of the partition wall 11 (the inner wall surface of the seal groove portion 75) is ensured, and the airtightness of the portion partitioned by the bearing body 51 between the adjacent intake ports 2 is ensured. Is done. The stepped portion 76 is formed corresponding to the corner 55 of the bearing body 51. The end surfaces of the stepped portions 76 (the end surfaces in the A direction and the B direction) are brought into contact with the corner portions 55 of the bearing main body 51, so that the rotating shaft 31 in the mounted state of the bearing member 50 (see FIG. 3). The center position is determined.

  The fitting concave portion 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. I have. That is, the fitting concave portion 72 is formed in a concave shape 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 into the fitting concave portion 72, the arm portion 52 is supported and positioned by the inner side surface of the partition wall 11 constituting the fitting concave portion 72. The fitting recesses 72 are formed on both sides in the longitudinal direction A corresponding to the arms 52 (52a and 52b) extending from the bearing body 51 to both sides in the longitudinal direction A. Each fitting recess 72 has the same configuration except that the length in the longitudinal direction A is different.

  As shown in FIG. 4, the fitting recess 72 has a side surface formed by the wall-shaped portion 11 a of the partition 11, and a bottom surface formed by the pedestal portion 11 b of the partition 11. The wall 11a of the partition 11 is formed so as to surround the periphery of the arm 52 (longitudinal direction A and axial direction X), and the end surface of the arm 52 on the longitudinal direction A side and the axial end X side. Abut The pedestal portion 11b is a flat portion having a stepped portion formed at a position recessed one step below (B2 side) from the upper end surface of the wall-shaped portion 11a. The base 11b is formed in a rectangular ring shape along the wall 11a surrounding the arm 52.

  When the arm portion 52 and the bearing-side welded portion 56 of the convex portion 52d are joined by vibration welding, a pressing force is applied to the arm portion 52 and the convex portion 52d from the upper surface side (B1 side) with respect to the bearing-side welded portion 56. At the same time, the welding target (welded portion on the side of the main body portion 4b), the arm 52, and the projection 52d relatively move (vibrate) in the welding surface. For this reason, the wall-shaped portion 11a determines the positions (positions in the longitudinal direction A and the axial direction X) of the arm portions 52 and the protruding portions 52d on the upper surface of the partition wall 11 and places the arm portions 52 and the protruding portions 52d in the plane. Has the function of fixing. The pedestal portion 11b has a function of supporting the arm portion 52 and the convex portion 52d against a pressing force applied from the upper surface side of the arm portion 52 and the convex portion 52d.

  As shown in FIG. 1, when assembling the intake control valve 3 to the main body portion 4 a, each of the bearing members 50 receives the intake air 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 fitted into the fitting concave portion 72 to perform positioning.

  As shown in FIG. 6, the convex-side welded portion 52e of the concave portion 11d and the concave-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 projection-side welded portion 52e and the recessed-side welded portion 11e be fitted by press-fitting or the like so that the gap becomes zero. The gap H in the direction in which the arm 52 extends in FIG. 6 is a gap generated due to dimensional variations of the protrusion 52d (the arm 52) and the recess 11d (the partition 11). The projection-side welded portion 52e and the recess-side welded portion 11e are welded in a state of being in close contact with each other. Thereby, the convex part 52d and the concave part 11d are fixed. That is, the bearing member 50 and the main body portion 4a are in a welded state.

  In a 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 main body 51, the arm portion 52, and the convex portion 52d of the bearing member 50. And a series of welding 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 welding portion 13 is not formed at the portion where the bearing mounting portion 70 is formed (see FIG. 4), and the bearing portion 50 is mounted on the bearing mounting portion 70. , A welding line composed of the first welding portion 13 and the bearing welding portion 56 is formed.

  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 11, and is fixed to the main body portion 4b. Thereby, in a state where the bearing member 50 is mounted on the main body portion 4a, the arm portion 52, the convex portion 52d, and the main body portion 4a (the upper surface of the partition wall 11) of the bearing member 50 are welded to the main body portion 4b. At this time, as shown in FIG. 7, the convex-side welded portion 52e of the convex portion 52d and the concave-side welded portion 11e of the concave portion 11d are joined by welding, and the upper surfaces (56 (52d) and 56 (FIG. 7) shown in FIG. 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 11 are joined by vibration welding.

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

  In this 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. Thus, even when the bearing member 50 is provided on the partition wall 11 between the adjacent intake ports 2, even if the pressure in the intake ports 2 increases, the resistance to pressure can be improved. Further, a welding portion (a projection-side welding portion 52e and a recess-side welding portion 11e) is provided in a direction in which the rotating shaft 31 extends in the projection 52d and the recess 11d, and the projection 52d and the recess are formed in a direction in which the arm 52 extends. Since the gap H is formed between the projection 52d and the projection 52d, the dimension of the projection 52d and the recess 11d in the direction in which the arm 52 extends does not require high dimensional accuracy. Thereby, the welded portion can be formed while suppressing the manufacturing cost of the convex portion 52d and the concave portion 11d. Furthermore, since the main body portion 4b is joined by vibration welding to the portion where the convex portion 52d and the concave portion 11d are welded, the resistance to pressure can be further improved.

  Further, in the present embodiment, the fitting concave portion 72 is formed so as to be substantially the same as the outer shape of the arm portion 52 in plan view, but the convex side welding portion 52e and the concave side welding portion 11e are mutually connected. Since the fitting recesses 72 are formed so as to be in close contact with each other, it is not necessary to maintain a high degree of dimensional accuracy in the length A and the lateral width (X direction) of the fitting recess 72. This makes it possible to mount the bearing member 50 while suppressing the manufacturing cost of the fitting recess 72.

  Further, in the present embodiment, the convex side welded portion 52e and the concave side welded 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 52 extends. Therefore, the bearing member 50 can be securely fitted into the partition wall 11 even if the dimensional accuracy of the rotation shaft 31 such as roundness and coaxiality is reduced.

  Further, in the above-described embodiment, the configuration in which the convex portion 52d is provided on the arm portion 52 of the bearing member 50 of the present invention and the concave portion 11d is provided on the partition wall 11d has been described. May be integrated by providing the convex portion 52d.

  In the above embodiment, the length L1 (52a side) and the length L2 (52b side) of the arm 52 are substantially equal to the lengths L3 and L4 of the formation range of the seal surface 25 along the direction A, respectively. Has been shown, but it need not be the same. That is, the lengths of L1 and L2 may be reduced. Further, the lengths of L1 and L2 may be longer than L3 and L4.

  Further, in the above embodiment, the example in which the intake device 100 including the bearing member 50 of the present invention is applied to an in-line four-cylinder engine for an automobile is shown, but the present invention is not limited to this. The intake device 100 provided with 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. Further, the present invention may be applied to an airflow control valve structure of a V-type cylinder engine other than an in-line four-cylinder engine or a horizontally opposed engine irrespective of whether it is a gasoline engine or not. Further, the present invention may be applied to an airflow control valve structure of an internal combustion engine installed as a drive source (power source) of not only an automobile but also equipment.

1 surge tank 11 partition 11d recess 11e recess side welded part (welded part)
13 First welding part 2 Intake port 3 Intake control valve 31 Rotating shaft 32 Valve element 33 Actuator 4a Main body (first intake device main body)
4b Main body part (second intake device main body)
50 Bearing Member 51 Bearing Main Body 52 Arm 52c End 52d Convex 52e Convex Side Welded Part (Welded Part)
56 Bearing side welding portion 90 Cylinder head 100 Intake device 101 Intake device body

Claims (4)

A plurality of intake ports adjacent via a bulkhead,
A valve element provided for each intake port;
A rotating shaft that rotates with the valve body;
A bearing member disposed on the partition wall and rotatably supporting the rotating shaft,
The bearing member, an arm extending along the partition wall,
Have a, a welding portion for fixing the said partition wall and an end portion of the arm portion,
The welded portion,
A protrusion formed to protrude on one of the end of the arm portion or the partition wall,
An intake device for an internal combustion engine , comprising: a recess fittable to the projection, and a recess formed in the other end of the partition or the arm . The welded portion forms a gap between the convex portion and the concave portion in a direction in which the arm portion extends, and is fixed in a state where the convex portion and the concave portion are in contact with each other in a direction in which the rotation axis extends. An intake device for an internal combustion engine according to claim 1. The bearing member is made of resin,
A first air intake device body made of resin to which the bearing member is attached;
A second air intake device main body made of resin, which is fixed in a state of being welded to the first air intake device main body,
It is fixed in a state where said bearing member is welded to the first intake device body, the bearing member, and claim 1 or the first intake device body is fixed in a state of being welded to the second intake device body An intake device for an internal combustion engine according to claim 2 . 4. The intake device for an internal combustion engine according to claim 3 , wherein the convex portion is formed so as to be flush with an end surface of the arm portion on the second intake device body side. 5.

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