Intake manifold

Abstract

To provide an intake manifold that can prevent erroneous assembly of a clip for holding a wiring member such as a wire harness and a pipe while simplifying structure and facilitating molding with a mold.SOLUTION: An intake manifold includes: a wall part 110 defining a surge tank St and a plurality of branch pipes Bp; and a projection piece 143 projecting in a flat plate shape from the wall part and having an insertion hole 143c. The intake manifold is formed of a resin material such that a wiring member W is held on an outer side of the wall part using a clip C having a flange part C1 that is seated on the projection piece around the insertion hole and an insertion part C2 to be inserted into the insertion hole. The projection piece 143 includes a prevention part 143d that allows seating of the flange part C1 of the clip on a first surface 143a on one side and prevents seating of the flange part C1 on a second surface 143b on the other side.SELECTED DRAWING: Figure 12

Description

[Technical Field]

[0001] The present invention relates to a resin intake manifold used in an engine intake system, and more particularly to an intake manifold having integrally molded protruding pieces for fixing clips for holding wiring members such as wire harnesses and hoses to its outer wall. [Background technology]

[0002] A known conventional intake manifold is an intake device made of a resin material that has a roughly cylindrical collector section with two integrally molded protruding pieces protruding from the outer wall, and a branch section that introduces intake air from the collector section into the cylinder head of the engine (see, for example, Patent Document 1).

[0003] In this intake system, the two protruding pieces are formed as thin plates protruding from the outer wall and have insertion holes. When a clip (harness clip) is inserted into the insertion hole of the protruding pieces to route and secure the wire harness along the outer wall, the insertion portion of the clip can be fitted into the insertion hole of the protruding piece from either one side or the other side of the protruding piece. Therefore, even if the orientation of the clip is preset based on the wiring layout of the wire harness, improper assembly of the clip may result in the wire harness being installed in the wrong position.

[0004] Another known intake manifold is made of a resin material and has multiple intake branches that curve and extend from the intake inlet, and two tongue-shaped protrusions that extend downward from the outer wall at two locations in the arrangement direction of the intake branches, and the protrusions have mounting holes into which clips that hold the cooling water piping are inserted (see, for example, Patent Document 2).

[0005] In this intake manifold, because there are no obstacles on either side of the protrusion, the clip can be inserted into the mounting hole from either side of the protrusion. Therefore, even if the orientation of the clip is predetermined based on the layout of the cooling water piping, there is a risk that the cooling water piping will be installed in the wrong position due to incorrect assembly of the clip. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-120467 [Patent Document 2] International Publication No. 2013 / 190883 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made in consideration of the above circumstances, and its object is to provide an intake manifold that can prevent incorrect assembly of clips that hold wiring components such as wire harnesses and piping, while simplifying the structure and facilitating molding using a mold. [Means for solving the problem]

[0008] The intake manifold of the present invention is an intake manifold molded from a resin material and includes a wall portion that defines a surge tank and multiple branch pipes, and a protruding piece that protrudes flat from the wall portion and has an insertion hole, and a wiring member is held on the outside of the wall portion using a clip that has a flange portion that seats on the protruding piece around the insertion hole and an insertion portion that is inserted into the insertion hole, and the protruding piece is configured to include a blocking portion that allows the flange portion of the clip to seat on a first surface on one side and prevents the flange portion from seating on a second surface on the other side.

[0009] In the intake manifold, the flange portion of the clip may have a circular outer contour, and at least a portion of the blocking portion may be formed at a position closer to the insertion hole than the outer diameter of the outer contour of the flange portion.

[0010] In the intake manifold described above, the blocking portion may be a protruding strip extending in the protruding direction of the protruding piece.

[0011] In the intake manifold described above, the blocking portion may be a reinforcing rib extending from the wall portion in the protruding direction of the protruding piece.

[0012] In the intake manifold described above, the blocking portion may also function as part of a lattice-shaped reinforcing rib that protrudes from the outer wall surface of the wall portion.

[0013] In the intake manifold described above, the protruding piece may include a reinforcing rib extending from the wall portion in a tapered shape in the protruding direction of the protruding piece at at least one edge of both edges.

[0014] In the intake manifold, the wiring member may be a wire harness.

[0015] In the intake manifold described above, the insertion hole for the protruding piece may be a molded hole formed by a mold using a small-diameter cylindrical portion corresponding to the inner diameter of the insertion hole, a large-diameter cylindrical portion having a diameter larger than the small-diameter cylindrical portion, and a punch pin having an annular flat surface at the boundary between the small-diameter cylindrical portion and the large-diameter cylindrical portion.

[0016] The intake manifold may include an opposing wall portion disposed opposite the protruding piece, and the protruding piece may be formed so that a second surface thereof faces the opposing wall portion.

[0017] In the above-mentioned intake manifold, a configuration may be adopted in which the opposing wall portion includes an opposing protruding piece that protrudes flat from the wall portion and has an insertion hole, and the opposing protruding piece allows the flange portion of the clip to seat on a third surface opposite the second surface of the protruding piece, and includes a restricting portion on at least one of both edges of a fourth surface opposite the third surface that interferes with the wiring member held by the clip to restrict incorrect assembly.

[0018] In the intake manifold, the opposing protruding piece may include a reinforcing rib at at least one of its two edges, extending tapered from the wall portion in the protruding direction of the opposing protruding piece, and the reinforcing rib may be formed so as to also serve as a regulating portion.

[0019] In the above-described intake manifold, a configuration may be adopted in which the insertion hole for the protruding piece is a molded hole formed by a mold using a first punch pin that has a small-diameter cylindrical section corresponding to the inner diameter of the protruding piece, a large-diameter cylindrical section with a diameter larger than the small-diameter cylindrical section, and an annular flat surface at the boundary between the small-diameter cylindrical section, and the insertion hole for the opposing protruding piece is a molded hole formed by a mold using a small-diameter cylindrical section corresponding to the inner diameter of the protruding piece, a large-diameter cylindrical section with a diameter larger than the small-diameter cylindrical section, and a second punch pin that is pulled out in the opposite direction to the first punch pin and has an annular flat surface at the boundary between the small-diameter cylindrical section and the large-diameter cylindrical section.

[0020] In the intake manifold, the insertion hole of the projecting piece and the insertion hole of the opposing projecting piece may be arranged on the same axis.

[0021] The intake manifold may include a main body member that defines a portion of the surge tank and a plurality of branch pipes, and a cover member that defines a portion of the surge tank and is joined to the main body member, and the protruding pieces may be formed on the wall portion of the main body member and the wall portion of the cover member.

[0022] In the intake manifold described above, the opposing wall portion may be formed on the cover member. [Effects of the Invention]

[0023] The intake manifold having the above configuration can achieve a simplified structure, facilitate molding using a mold, and prevent incorrect assembly of clips that hold wiring members such as wire harnesses and pipes. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a perspective view showing an intake manifold according to an embodiment of the present invention and a wire harness as a wiring member held via clips on the outside of a wall portion of the intake manifold; [Figure 2] 1 is a perspective view showing an intake manifold according to an embodiment of the present invention and a wire harness as a wiring member held via clips on the outside of a wall portion of the intake manifold; [Figure 3] 1 is a perspective view of an intake manifold according to an embodiment, showing an external appearance of a cover member as viewed obliquely from above. FIG. [Figure 4] 1 is a perspective view showing a wire harness and a clip as a wiring member arranged on the outside of a wall portion of an intake manifold according to an embodiment; [Figure 5] FIG. 2 is a perspective view showing a clip for holding a wire harness. [Figure 6] 2 is an exploded perspective view showing a state before a main body member and a cover member that constitute an intake manifold according to one embodiment are welded together. FIG. [Figure 7] 2 is an exploded perspective view showing a state before a main body member and a cover member that constitute an intake manifold according to one embodiment are welded together. FIG. [Figure 8] FIG. 2 is a partially enlarged view of a part of the state shown in FIG. 1. [Figure 9] FIG. 9 is a partial cross-sectional view taken along line L1-L1 in FIG. 8. [Figure 10] FIG. 2 is a partially enlarged view of a part of the state shown in FIG. 1. [Figure 11] 11 is a partially enlarged view of the area shown in FIG. 10 viewed from a different angle. [Figure 12]FIG. 12 is a partial cross-sectional view taken along line L2-L2 in FIG. [Figure 13] FIG. 13 is an enlarged cross-sectional view showing a part of FIG. 12 in a partially enlarged manner. [Figure 14] FIG. 13 is an enlarged cross-sectional view showing a part of FIG. 12 in a partially enlarged manner. [Figure 15] FIG. 3 is a partially enlarged view of a part of the state shown in FIG. 2. [Figure 16] FIG. 16 is a partially enlarged view of the area shown in FIG. 15, viewed from a different angle. [Figure 17] FIG. 17 is a partial cross-sectional view taken along line L3-L3 in FIG. [Figure 18] FIG. 2 is a partially enlarged view of a main body member that constitutes the intake manifold. [Figure 19] 10 is a perspective view showing a portion of a cover member that constitutes an intake manifold according to one embodiment, the portion being molded using a punch pin. FIG. [Figure 20] FIG. 2 is a perspective view showing a lower die, an upper die (transparent view), and a draw pin, illustrating a configuration of a mold for molding a cover member that constitutes an intake manifold according to one embodiment. [Figure 21] 21A to 21C are schematic diagrams showing the steps of injection molding a cover member for an intake manifold according to one embodiment using the mold shown in FIG. 20. [Figure 22] 21A to 21C are schematic diagrams showing the steps of injection molding a cover member for an intake manifold according to one embodiment using the mold shown in FIG. 20. [Figure 23] 21A to 21C are schematic diagrams showing the steps of injection molding a cover member for an intake manifold according to one embodiment using the mold shown in FIG. 20. [Figure 24] FIG. 10 is a partial cross-sectional view showing a portion of an intake manifold according to another embodiment of the present invention. [Figure 25] 10A and 10B are diagrams showing modified examples of the arrangement position of the blocking portion according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0025] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. The intake manifold of the present invention is molded using a resin material in a mold and is disposed between a throttle device located downstream of an intake duct in an engine intake system and a cylinder head of an engine body. The intake manifold M according to one embodiment is applied to engines of, for example, transport vehicles, tractors, special vehicles, and other special machines.

[0026] As shown in Figures 1 to 3, the intake manifold M is made up of a cover member 100 and a main body member 200 joined by vibration welding, and as a whole is equipped with a surge tank St for temporarily storing intake air and multiple (here, two) branch pipes Bp. A wire harness W as a wiring member is held on the outside of the intake manifold M via a clip C.

[0027] As shown in Fig. 4, the wire harness W is formed into a flexible tube by bundling a plurality of electrical wires, and includes a thick wire portion W1, a thin wire portion W2, and a connector portion W3. The thick wire portion W1 of the wire harness W is relatively hard to bend, while the thin wire portion W2 is easy to bend, so that the wire harness W as a whole can bend along the wall of the intake manifold M. Note that in Fig. 4, the tip end region of the thin wire portion W2 of the wire harness W is omitted.

[0028] The clip C is a molded resin product used as a harness clip, and as shown in Figure 5, it has an umbrella-shaped disk-shaped flange portion C1, an insertion portion C2 protruding from one side of the flange portion C1, and a binding portion C3 formed on the other side of the flange portion C1. The flange portion C1 has a circular outer contour with a predetermined outer diameter, and is attached in the correct assembly position by seating its entire circumference against a predetermined surface. The insertion portion C2 is inserted into a predetermined insertion hole by snap-fitting and fixed. The bundling portion C3 bundles and holds the wire harness W by bending a band surrounding the wire harness W and locking it with a locking claw.

[0029] When the wire harness W is assembled, the clips C are attached to the wire harness W in advance at desired positions of the wire harness W via the bundling portions C3. In addition, in order to provide flexibility in assembly, the binding portion C3 of the clip C is in a rotatable binding state, and by rotating the binding portion C3 around the wire harness W, the flange portion C1 and insertion portion C2 of the clip C can be changed to the desired orientation.

[0030] The cover member 100 is injection molded using a resin material in a mold, and as shown in Figures 6 and 7, it includes a wall portion 110 that defines a part of the surge tank St, a joint portion 120, a lattice-shaped reinforcing rib 130 formed on the outer wall surface 110a of the wall portion 110, a plurality of protruding pieces 141, 142, 143, 144 that protrude from the outer wall surface 110a of the wall portion 110, a plurality of bracket portions 151, 152, 153, and a pipe portion 160.

[0031] The wall portion 110 is composed of side wall portions 111, 112, 113, and 114 and an upper wall portion 115, and defines a recessed portion having a substantially rectangular parallelepiped shape as a whole. The joint portion 120 is formed to define a joining surface having a substantially rectangular annular shape, and is joined to the joint portion 220 of the main body member 200 and joined by vibration welding. The lattice-shaped reinforcing ribs 130 are formed to protrude in a lattice pattern from the outer wall surface 110a of the wall portion 110 to a predetermined height and to have a substantially rectangular cross section, in order to increase the overall bending strength of the wall portion 110.

[0032] The protruding pieces 141, 142, 143, and 144 are formed to protrude from the outer wall surface 110a of the wall portion 110 in the shape of a roughly rectangular flat plate having a predetermined thickness, and are assembled by inserting a clip C that holds the wire harness W that is arranged on the outside of the wall portion 110.

[0033] 6 to 9, the protruding piece 141 is formed in the connection region between the side wall portion 111 and the side wall portion 114 so as to protrude in a direction perpendicular to the upper wall portion 115. The protruding piece 141 includes a first surface 141a on one side, a second surface 141b on the other side, an insertion hole 141c, a blocking portion 141d, and a reinforcing rib 141e.

[0034] The first surface 141a is formed to include a flat surface on which the flange portion C1 of the clip C can be seated over the entire periphery. The second surface 141b is generally flat and is formed to include a blocking portion 141d that extends to a position close to the insertion hole 141c. The insertion hole 141c is formed as a circular hole into which the insertion portion C2 of the clip C can be inserted by snap-fitting, and is a molded hole formed by a die punch. The blocking portion 141d functions to prevent the flange portion C1 of the clip C from seating, and is formed in the form of a reinforcing rib that protrudes in a protruding manner from the second surface 141b and extends tapered in the protruding direction of the protruding piece 141. Specifically, as shown in Figures 8 and 9, the blocking portion 141d is formed so as to extend in the protruding direction of the protruding piece 141 and to be positioned on a straight line passing through the center of the insertion hole 141c, and its tip region is formed so as to extend to a position (a position beyond the dotted line in Figure 9) closer to the insertion hole 141c than the outer diameter of the flange portion C1 of the clip C (the position of the dotted line in Figure 9). In order to increase the bending strength of the protruding piece 141, the reinforcing ribs 141e are formed on both edges of the protruding piece 141 so as to extend in a tapered shape from the wall portion 110 in the protruding direction of the protruding piece 141. Here, the reinforcing rib 141e is formed so as not to interfere with the clip C to be assembled and the wire harness W held by the clip C. In other words, the protruding piece 141 is configured so as not to interfere with the wire harness W at both the correct assembly position on the first surface 141a side and the incorrect assembly position on the second surface 141b side.

[0035] 6 to 8, protruding piece 142 is formed in the connection region between side wall portion 111 and top wall portion 115, protruding in a direction perpendicular to top wall portion 115 so as to be aligned on the same plane as protruding piece 141. Protruding piece 142 has a first surface 142a on one side, a second surface 142b on the other side, an insertion hole 142c, and a reinforcing rib 142e.

[0036] The first surface 142a and the second surface 142b are formed to include a flat surface on which the flange portion C1 of the clip C can be seated over the entire periphery. The insertion hole 142c is formed as a circular hole into which the insertion portion C2 of the clip C can be inserted by snap-fitting, and is a molded hole formed by a die punch. In order to increase the bending strength of the protruding piece 142, the reinforcing ribs 142e are formed on both edges of the protruding piece 142 so as to extend in a tapered shape from the wall portion 110 in the protruding direction of the protruding piece 142. Here, the reinforcing rib 142e is formed so as not to interfere with the clip C to be assembled and the wire harness W held by the clip C. In other words, the protruding piece 142 is configured so as not to interfere with the wire harness W in both the correct assembly position on the first surface 142a side and the incorrect assembly position on the second surface 142b side.

[0037] 6, 7, 10 to 13, protruding piece 143 is formed in the connection region between side wall portion 113 and top wall portion 115 so as to protrude in a direction perpendicular to top wall portion 115. Protruding piece 143 includes a first surface 143a on one side, a second surface 143b on the other side, an insertion hole 143c, a blocking portion 143d, and a reinforcing rib 143e.

[0038] The first surface 143a is formed to include a flat surface on which the flange portion C1 of the clip C can be seated over the entire periphery. The second surface 143b is generally flat and is formed to include a blocking portion 143d that extends to a position close to the insertion hole 143c. The insertion hole 143c is formed as a circular hole into which the insertion portion C2 of the clip C can be inserted by snap-fitting, and is a molded hole formed by a die punch. The blocking portion 143d functions to prevent the flange portion C1 of the clip C from seating, and is formed in the form of a protrusion that protrudes from the second surface 143b and extends in the protruding direction of the protruding piece 143. Specifically, as shown in Figures 11 to 13, the blocking portion 143d is formed so as to extend in the protruding direction of the protruding piece 143 and to be positioned on a straight line passing through the center of the insertion hole 143c, and its tip region is formed so as to extend to a position (a position beyond the dotted line in Figure 13) closer to the insertion hole 143c than the outer diameter of the flange portion C1 of the clip C (the position of the dotted line in Figure 13). In order to increase the bending strength of the protruding piece 143, the reinforcing ribs 143e are formed on both edges of the protruding piece 143 so as to extend in a tapered shape from the wall portion 110 in the protruding direction of the protruding piece 143. Here, the reinforcing rib 143e is formed so as not to interfere with the clip C to be assembled and the wire harness W held by the clip C. In other words, the protruding piece 143 is configured so as not to interfere with the wire harness W in both the correct assembly position on the first surface 143a side and the incorrect assembly position on the second surface 143b side.

[0039] 6, 7, 10 to 12, and 14, protruding piece 144 is formed in the connection region between side wall portion 113 and top wall portion 115 so as to be aligned opposite protruding piece 143 on axis S, that is, so as to form an opposing protruding piece as an opposing wall portion arranged opposite protruding piece 143, and so as to protrude in a direction perpendicular to top wall portion 115. Protruding piece 144 includes a third surface 144a on one side, a fourth surface 144b on the other side, an insertion hole 144c, a restricting portion 144d, and a reinforcing rib 144e.

[0040] The third surface 144a faces the second surface 143b of the protruding piece 143 in the direction of the axis S, and is formed to include a flat surface on which the flange portion C1 of the clip C can be seated over its entire periphery. The fourth surface 144b is located on the opposite side to the third surface 144a, and is formed to include a flat surface on which the flange portion C1 of the clip C can be seated over the entire periphery. The insertion hole 144c is formed as a circular hole into which the insertion portion C2 of the clip C can be inserted by snap-fitting, and is a molded hole formed by a die punch. The restricting portion 144d functions to restrict incorrect assembly by interfering with (the thin wire portion W2 of) the wire harness W held by the clip C (within the circle indicated by the two-dot chain line in FIG. 14), and is formed in the form of a reinforcing rib that extends tapered from the wall portion 110 in the protruding direction of the protruding piece 144 on both edges of the fourth surface 144b. That is, the restricting portion 144d is formed so as to also function as a reinforcing rib that increases the bending strength of the protruding piece 144, in addition to the function of restricting incorrect assembly. In other words, the reinforcing rib is formed so as to also function as the restricting portion 144d. In order to increase the bending strength of the protruding piece 144, the reinforcing ribs 144e are formed on both edges of the third surface 144a so as to extend in a tapered shape in the protruding direction of the protruding piece 144 from the wall portion 110. Here, the reinforcing rib 144e is formed so as not to interfere with the clip C to be assembled and the wire harness W held by the clip C. That is, the protruding piece 144 is formed so as not to interfere with the wire harness W in the correct assembly position on the third surface 144a side, and is formed so as to cause the wire harness W to interfere with the restricting portion 144d in the incorrect assembly position on the fourth surface 144b side. 12, the insertion hole 143c of the protruding piece 143 and the insertion hole 144c of the protruding piece 144 are arranged on the same axis S.

[0041] As shown in Figures 6 and 19, bracket portions 151, 152, and 153 are formed to define U-shaped or L-shaped enclosing walls in the connection area between side wall portion 111 and side wall portion 112, the area of ​​side wall portion 111, and the connection area between side wall portion 111 and side wall portion 114, respectively, and are provided with outward-facing flat surfaces 151a, 152a, and 153a and insertion holes 151c, 152c, and 153c. The flat surfaces 151a, 152a, and 153a are formed so that the flange C1 of the clip C can be seated over the entire periphery thereof. The insertion holes 151c, 152c, and 153c are formed as circular holes into which the insertion portion C2 of the clip C can be inserted by snap-fitting, and are formed by using a die punch. Here, the bracket portions 151, 152, 153 are formed so that the wire harness W does not interfere with the outwardly facing flat surfaces 151a, 152a, 153a in the normal assembly position where the flange portion C1 of the clip C can be seated. Note that the bracket portions 151, 152, 153 have no space for passing the wire harness W in the area opposite the flat surfaces 151a, 152a, 153a, so that incorrect assembly does not occur.

[0042] The pipe portion 160 is cylindrical and protrudes vertically from the side wall portion 114, as shown in Figures 7 and 19, in order to connect a hose or the like, and is formed so as to define a cylindrical hole 161 formed by a die punch.

[0043] The main body member 200 is injection molded using a resin material in a mold, and as shown in Figures 6, 7, and 18, it includes a wall portion 210 that defines a part of the surge tank St, a joint portion 220, a flange portion 230, bracket portions 241, 242, a lattice-shaped reinforcing rib 250 formed on the outer wall surface 210a of the wall portion 210, a protruding piece 260 that protrudes from the outer wall surface 210a of the wall portion 210, a bracket portion 270, a flange portion 280, a connector mounting portion 290, etc.

[0044] The wall portion 210 is composed of side wall portions 211, 212, 213, and 214, a bottom wall portion 215, and two cylindrical wall portions 216 that are continuous with the bottom wall portion 215, and defines a substantially rectangular parallelepiped recess and two passages as a whole. Note that the cylindrical wall portion 216 is formed with a mounting hole 216a for mounting a fuel injection valve.

[0045] The joint portion 220 is formed to define a joining surface having a substantially rectangular ring shape, and is joined to the joint portion 120 of the cover member 100 and joined by vibration welding. The flange portion 230 is used to join and fasten the throttle device, and is provided with a cylindrical passage 231, a joining surface 232, and four screw holes 233. The bracket portions 241, 242 are used to fix the intake manifold M to the engine body, and are provided with circular holes 241a, 242a formed between the two cylindrical wall portions 216 and in the side wall portion 213, respectively, for passing bolts therethrough. The lattice-shaped reinforcing ribs 250 are formed to protrude in a lattice pattern from the outer wall surface 210a of the wall portion 210 to a predetermined height and to have a substantially rectangular cross section, in order to increase the overall bending strength of the wall portion 210.

[0046] The protruding piece 260 is formed as a roughly rectangular flat plate of a predetermined thickness that protrudes from the outer wall surface 210a of the wall portion 210, and is assembled by inserting a clip C that holds the wire harness W that is arranged on the outside of the wall portion 210. 15 to 17, the protruding piece 260 is formed in the area of ​​the side wall portion 211 so as to protrude in a direction perpendicular to the side wall portion 211. The protruding piece 260 includes a first surface 261 on one side, a second surface 262 on the other side, an insertion hole 263, a blocking portion 264, and a reinforcing rib 265.

[0047] The first surface 261 is formed to include a flat surface on which the flange portion C1 of the clip C can be seated over the entire periphery. The second surface 262 is generally flat and is formed to include a blocking portion 264 that extends to a position close to the insertion hole 263. The insertion hole 263 is formed as a circular hole into which the insertion portion C2 of the clip C can be inserted by snap-fitting, and is a molded hole formed by a die punch. The blocking portion 264 functions to prevent the flange portion C1 of the clip C from being seated, and is formed so that a part 251 of the lattice-shaped reinforcing rib 250 is connected to the second surface 262. Specifically, as shown in Figure 17, the blocking portion 264 extends in the protruding direction of the protruding piece 260 and is formed at a position deviated from the center of the insertion hole 263, and its tip region is formed to extend to a position closer to the insertion hole 263 than the outer diameter of the flange portion C1 of the clip C (the circle indicated by the dotted line in Figure 17). In other words, the blocking portion 264 is formed so as to also serve as a part 251 of the lattice-shaped reinforcing rib 250 . The reinforcing ribs 265 are formed on both edges of the protruding piece 260 so as to extend in a tapered shape from the wall portion 210 in the protruding direction of the protruding piece 260 in order to increase the bending strength of the protruding piece 260 . Here, the reinforcing rib 265 is formed so as not to interfere with the clip C to be assembled and the wire harness W held by the clip C. In other words, the protruding piece 260 is configured so as not to interfere with the wire harness W in both the correct assembly position on the first surface 261 side and the incorrect assembly position on the second surface 262 side.

[0048] As shown in FIG. 18, the bracket portion 270 is formed in the region of the side wall portion 214 so as to define an enclosing wall that is bent in a U-shape, and is provided with an outwardly facing flat surface 271 and an insertion hole 272 . The flat surface 271 is formed so that the flange C1 of the clip C can be seated over its entire periphery. The insertion hole 272 is formed as a circular hole into which the insertion portion C2 of the clip C can be inserted by snap-fitting, and is a molded hole formed by a die punch. Here, the bracket portion 270 is formed so that the wire harness W does not interfere with the normal assembly position where the flange portion C1 of the clip C can be seated on the outward-facing flat surface 271. Note that the bracket portion 270 has a shape that prevents incorrect assembly because there is no space for the wire harness W to pass through in the area opposite the flat surface 271.

[0049] The flange portion 280 is formed in the area of ​​the side wall portion 211 to mount the sensor unit, and is provided with a circular hole 281 and two screw holes 282 . As shown in FIG. 7, the connector attachment portion 290 is formed in the region of the cylindrical wall portion 216 so as to define an enclosing wall bent in a U-shape, and has an insertion hole 291 into which part of the connector portion W3 is inserted.

[0050] Next, we will explain the molding of the cover member 100 that constitutes the intake manifold M using a mold. Here, in the cover member 100, as shown in Fig. 19, insertion holes 141c, 142c, 143c, 144c, 151c, 152c, 153c of the four protruding pieces 141, 142, 143, 144 and the three bracket portions 151, 152, 153 are formed by a punch pin P, and also the cylindrical hole 161 of the pipe portion 160 is formed by a punch pin P.

[0051] As shown in Figure 20, the mold comprises a lower mold A, an upper mold B, and a number of die pins P, and is used for injection molding by injecting a resin material into a cavity formed inside. For ease of explanation, the upper mold B is shown in a perspective view. Here, the draw pin P is formed to have a small-diameter cylindrical portion Pa that corresponds to the inner diameter of the insertion holes 141c, 142c, 143c, 144c, 151c, 152c, 153c and the cylindrical hole 161, a large-diameter cylindrical portion Pb that is larger in diameter than the small-diameter cylindrical portion Pa, and an annular flat surface Pc at the boundary between the small-diameter cylindrical portion Pa and the large-diameter cylindrical portion Pb. The draw pin P has the large-diameter cylindrical portion Pb to ensure mechanical strength. That is, the insertion holes 141c, 142c of the protruding pieces 141, 142 are formed holes formed by a mold using a small-diameter cylindrical portion Pa corresponding to the inner diameter thereof, a large-diameter cylindrical portion Pb having a diameter larger than that of the small-diameter cylindrical portion Pa, and a punch pin P having an annular flat surface Pc at the boundary between the small-diameter cylindrical portion Pa and the large-diameter cylindrical portion Pb.

[0052] Here, the molding of the protruding pieces 143, 144 will be particularly described with reference to Figures 21 to 23. Since the insertion hole 143c of the protruding piece 143 and the insertion hole 144c of the protruding piece 144 are formed on the same axis S, the first punch pin P1 and the second punch pin P2 are also inserted into and pulled out of the insertion hole B1 on the same axis S. The first punch pin P1 and the second punch pin P2 are identical to the punch pin P described above, and have a small-diameter cylindrical portion Pa, a large-diameter cylindrical portion Pb having a diameter larger than the small-diameter cylindrical portion Pa, and an annular flat surface Pc at the boundary between the small-diameter cylindrical portion Pa and the large-diameter cylindrical portion Pb.

[0053] First, the lower mold A and the upper mold B are joined together as shown in Fig. 21. Then, the first punch pin P1 is inserted into the insertion hole B1 of the upper mold B from one direction on the axis S, and the second punch pin P2 is inserted into the insertion hole B1 of the upper mold B from the other direction on the axis S. Next, a resin material is injected into the cavity defined by the lower mold A and the upper mold B. Thereafter, as shown in FIG. 22, the first duct pin P1 is removed from the insertion hole B1 of the upper mold B in one direction, and the second duct pin P2 is removed from the insertion hole B1 of the upper mold B in the opposite direction to the first duct pin P1. Finally, as shown in FIG. 23, the lower mold A and the upper mold B are separated, and the molded product is taken out of the cavity as the cover member 100.

[0054] That is, the insertion hole 143c of the protruding piece 143 is a molded hole formed by a mold using a first punch pin P1 having a small-diameter cylindrical portion Pa corresponding to its inner diameter, a large-diameter cylindrical portion Pb having a diameter larger than that of the small-diameter cylindrical portion Pa, and an annular flat surface Pc at the boundary between the small-diameter cylindrical portion Pa and the large-diameter cylindrical portion Pb. The insertion hole 144c of the protruding piece 144 as the opposing protruding piece is a molded hole having a small-diameter cylindrical portion Pa corresponding to its inner diameter, a large-diameter cylindrical portion Pb having a diameter larger than that of the small-diameter cylindrical portion Pa, and an annular flat surface Pc at the boundary between the small-diameter cylindrical portion Pa and the large-diameter cylindrical portion Pb, and is formed by a mold using a second punch pin P2 that is pulled out in the opposite direction to the first punch pin P1.

[0055] In this way, when the molded product has the protruding pieces 143, 144 facing each other, the first void pin P1 and the second void pin P2 cannot be inserted and extracted from the same direction on the axis S. Therefore, on the fourth surface 144b of the protruding piece 144, the large-diameter cylindrical portion Pb of the second void pin P2 gets in the way, and it is not possible to form a blocking portion similar to the blocking portion 143d on the second surface 143b of the protruding piece 143. Therefore, on both edges of the fourth surface 144b of the protruding piece 144, there are formed restricting portions 144d that interfere with the wire harness W held by the clip C to prevent incorrect assembly, rather than restricting portions that prevent the flange portion C1 of the clip C from seating. Like the cover member 100, the main body member 200 is also molded using a mold and a punch.

[0056] Next, the operation of assembling the wire harness W to the outside of the intake manifold M using the clips C will be described. Here, the wire harness W is prepared with a plurality of clips C attached at desired positions.

[0057] First, the clip C is attached to the protruding piece 141 in the region of the thick line portion W1. At this time, the blocking portion 141d provided on the second surface 141b side of the protruding piece 141 is visible, so the flange portion C1 of the clip C is assembled so as to be seated on the first surface 141a, which is the correct assembly position. Subsequently, other clips C in the region of the thick line portion W1 are assembled to the protruding pieces 142. At this time, although no blocking portion is provided on the protruding piece 142, due to the resistance of the thick line portion W1 to bending and the fact that the protruding piece 142 is arranged on the same plane as the protruding piece 141, the clip C is assembled so that it sits on the first surface 142a of the protruding piece 142 without being misassembled. Similarly, the plurality of clips C of the thin wire portion W2 are assembled to the projecting pieces 143, 144, 260 and the bracket portions 151, 152, 153, 270 at their normal assembly positions. The assembly work is not limited to the above procedure, and other methods and procedures may be adopted.

[0058] According to the intake manifold M of the above embodiment, the protruding pieces 141, 143, 260 allow the flange portion C1 of the clip C to seat on the first surface 141a, 143a, 261 on one side, and include a blocking portion 141d, 143d, 264 that prevents the flange portion C1 from seating on the second surface 141b, 143b, 262 on the other side, thereby preventing incorrect assembly of the clip C on the opposite side different from the correct assembly position. In particular, by adopting blocking portion 141d in the form of a reinforcing rib, blocking portion 143d in the form of a protrusion, and blocking portion 264 in the form of a part 251 of lattice-shaped reinforcing rib 250, it is possible to achieve a simplified structure while ensuring mechanical bending strength in addition to preventing incorrect assembly.

[0059] Furthermore, the protruding piece 144 as an opposing protruding piece allows the flange portion C1 of the clip C to be seated on the third surface 144a opposite the second surface 143b of the protruding piece 143, and includes a restricting portion 144d at at least one edge of both edges of the fourth surface 144b opposite the third surface 144a that interferes with the wiring member (wire harness W) held by the clip C to restrict incorrect assembly.Therefore, even without providing a restricting portion such as the restricting portion 143d of the protruding piece 143, incorrect assembly of the clip C on the opposite side from the correct assembly position can be prevented. In particular, the regulating portion 144d is formed as a reinforcing rib that extends tapered from the wall portion 110 in the protruding direction of the protruding piece 144 at least on one of the two edges of the protruding piece 144, that is, the reinforcing rib is formed to also serve as the regulating portion 144d, thereby achieving a simplified structure while ensuring mechanical bending strength in addition to preventing incorrect assembly.

[0060] In particular, when the insertion hole 143c of the protruding piece 143 and the insertion hole 144c of the protruding piece 144 serving as the opposing protruding piece are arranged on the same axis S, by providing a blocking portion 143d on the protruding piece 143 and a regulating portion 144d on the protruding piece 144, the insertion holes 143c, 144c can be easily formed in the mold using a punch pin.

[0061] In the above embodiment, the protruding piece 144 that faces the protruding piece 143 in the direction of the axis S is shown as the opposing wall portion that is disposed opposite the protruding piece 143, but the present invention is not limited to this. For example, as shown in FIG. 24, a part of the wall 110 of the cover member 100 may be configured to face the protruding piece 143 as a facing wall 110b. Even in this case, a space is secured between the protruding piece 143 and the opposing wall portion 110b in which the wire harness W can be placed, and in order to prevent incorrect assembly in which the wire harness W is placed in this space, a similar blocking portion 143d is provided on the second surface 143b of the protruding piece 143, thereby preventing incorrect assembly of the clip C.

[0062] In the above embodiment, the blocking portions that prevent the flange portion C1 of the clip C from seating are blocking portion 141d in the form of a reinforcing rib, blocking portion 143d in the form of a protrusion, and blocking portion 264 that is part of a lattice-shaped reinforcing rib, but this is not limited to these and blocking portions in other forms may also be used.

[0063] In the above embodiment, the blocking portions that prevent the flange portion C1 of the clip C from seating are blocking portion 141d, which has the form of a reinforcing rib and is located on a straight line passing through the center of the insertion hole 141c, and blocking portion 143d, which has the form of a protrusion and is located on a straight line passing through the center of the insertion hole 143c, but are not limited to these. For example, in the case of the blocking portion 143d, as shown in Figure 25, a blocking portion 143d may be adopted in which at least a portion of the blocking portion 143d is formed at a position deviating to the left or right from a straight line passing through the center of the insertion hole 143c, as shown by a dotted line, so that the blocking portion 143d is closer to the insertion hole 143c than the outer diameter of the outer contour of the flange portion C1 of the clip C.

[0064] In the above embodiment, the restricting portion 144d in the form of a reinforcing rib is shown as a restricting portion that restricts incorrect assembly by interference with the wiring member (wire harness W) held by the clip C, but this is not limited to this and restricting portions in other forms may also be adopted.

[0065] In the above embodiment, the insertion hole 143c of the protruding piece 143 and the insertion hole 144c of the protruding piece 144 as the opposing protruding piece are arranged on the same axis S, but this is not limited to this, and as long as the insertion hole of one protruding piece overlaps so as to face the other protruding piece, the insertion hole of the protruding piece and the insertion hole of the opposing protruding piece do not have to be arranged on the same axis.

[0066] In the above embodiment, the clip C has a flange C1 with a circular outer contour, and the insertion holes 141c, 142c, 143c, 144c, 151c, 152c, 153c, 263, and 272 are circular holes, but this is not limited to this. For example, even if the flange portion of the clip has an outer contour other than circular and the insertion hole has a shape other than a circular hole, other shapes may be adopted as long as the protruding piece includes a blocking portion that allows the flange portion of the clip to seat on the first surface on one side and prevents the flange portion from seating on the second surface on the other side.

[0067] In the above embodiment, the wire harness W is shown as the wiring member held by the clip C, but this is not limited thereto, and the clip C may be configured to hold a hose or the like through which a fluid passes.

[0068] In the above embodiment, the intake manifold is an intake manifold M composed of a cover member 100 and a main body member 200, but this is not limited to this, and an intake manifold having another separate form, or an intake manifold molded as a whole in one piece if it can be molded using a mold, may also be used.

[0069] As described above, the intake manifold of the present invention achieves simplified structure and facilitates molding using a mold, while preventing incorrect assembly of clips that hold wiring components such as wire harnesses and piping. Therefore, it is not only applicable to engines of transport vehicles, tractors, special vehicles, and other special machinery, but is also useful as an intake manifold for other engines. [Explanation of symbols]

[0070] M intake manifold C-clip C1 Tsuba C2 insertion part C3 joint A Lower Die B Upper mold P Extraction pin P1 First removal pin P2 Second removal pin Pa Small diameter cylindrical section Pb Large diameter cylindrical part Pc Annular flat surface 100 Cover member 110 Wall section 110a Exterior wall surface 110b Opposing wall 111, 112, 113, 114 Side wall 115 Upper wall section 120 Joint 130 Lattice-shaped reinforcing rib S axis 141,142,143 Projecting piece 141a,142a,143a 1st page 141b,142b,143b 2nd side 141c, 142c, 143c Insertion holes 141d,142d,143d Blocking part 141e, 142e, 143e Reinforcing rib 144 Projecting piece (opposing projecting piece, opposing wall part) 144a 3rd page 144b Side 4 144c Insertion hole 144d Regulatory Department 144e Reinforcing rib 151, 152, 153 Bracket part 151c, 152c, 153c Insertion holes 160 Pipe section 161 Cylindrical hole 200 Main body member 210 Wall section 210a Exterior wall 211, 212, 213, 214 Side wall 215 Lower wall part 216 Cylindrical wall 220 Joint 230 Flange 241,242 Bracket part 250 lattice reinforcement rib 251 Part of lattice-shaped reinforcing rib 260 Projecting piece 261 Page 1 262 2nd page 263 Insertion hole 264 Blocking part 265 Reinforcing rib 270 Bracket part 272 Insertion hole

Claims

1. An intake manifold molded from a resin material, comprising: a wall portion defining a surge tank and a plurality of branch pipes; and a protruding piece protruding from the wall portion in a flat plate shape and having an insertion hole, wherein a wiring member is held on the outside of the wall portion using a clip having a flange portion seated on the protruding piece around the insertion hole and an insertion portion inserted into the insertion hole, The protruding piece includes a first surface on one side that allows the flange portion of the clip to be seated, and a blocking portion on a second surface on the other side that prevents the flange portion from being seated. An intake manifold characterized by:

2. The flange has a circular outer contour, At least a portion of the blocking portion is formed at a position closer to the insertion hole than the outer diameter of the outer contour.

2. The intake manifold according to claim 1, wherein:

3. The blocking portion forms a protrusion extending in the protruding direction of the protruding piece.

2. The intake manifold according to claim 1, wherein:

4. The blocking portion forms a reinforcing rib extending from the wall portion in the protruding direction of the protruding piece.

2. The intake manifold according to claim 1, wherein:

5. The blocking portion also serves as a part of a lattice-shaped reinforcing rib protruding from the outer wall surface of the wall portion.

2. The intake manifold according to claim 1, wherein:

6. The protruding piece includes a reinforcing rib extending from the wall portion in a tapered shape in a protruding direction of the protruding piece at at least one edge of both edges.

2. The intake manifold according to claim 1, wherein:

7. The wiring member is a wire harness.

2. The intake manifold according to claim 1, wherein:

8. The insertion hole for the protruding piece is a molded hole formed by a die using a punch having a small-diameter cylindrical portion corresponding to the inner diameter of the protruding piece, a large-diameter cylindrical portion having a diameter larger than the small-diameter cylindrical portion, and an annular flat surface at the boundary between the small-diameter cylindrical portion and the large-diameter cylindrical portion.

2. The intake manifold according to claim 1, wherein:

9. an opposing wall portion disposed opposite the protruding piece, The protruding piece is formed so that the opposing wall portion and the second surface face each other.

8. An intake manifold according to claim 1, wherein the intake manifold is a tubular member.

10. the opposing wall portion includes an opposing protruding piece that protrudes from the wall portion in a flat plate shape and has an insertion hole, The opposing protruding piece includes a third surface opposing the second surface of the protruding piece, which allows a flange portion of the clip to be seated, and a fourth surface opposite the third surface, which includes a restricting portion at least one of both edges of which is interfered with by a wiring member held by the clip to restrict incorrect assembly.

10. The intake manifold according to claim 9, wherein:

11. The opposing protruding piece includes a reinforcing rib extending from the wall portion in a tapered shape in a protruding direction of the opposing protruding piece at at least one edge of both edges, The reinforcing rib is formed so as to also serve as the restricting portion.

11. The intake manifold according to claim 10.

12. the insertion hole for the protruding piece is a molding hole formed by a mold using a first die, which has a small-diameter cylindrical portion corresponding to the inner diameter of the insertion hole, a large-diameter cylindrical portion having a diameter larger than that of the small-diameter cylindrical portion, and an annular flat surface at the boundary between the small-diameter cylindrical portion and the large-diameter cylindrical portion; The insertion hole of the opposing protruding piece is a molded hole having a small-diameter cylindrical portion corresponding to the inner diameter of the opposing protruding piece, a large-diameter cylindrical portion having a diameter larger than the small-diameter cylindrical portion, and an annular flat surface at the boundary between the small-diameter cylindrical portion and the large-diameter cylindrical portion, and is molded by a mold using a second die pin that is pulled out in the opposite direction to the first die pin.

11. The intake manifold according to claim 10.

13. The insertion hole of the protruding piece and the insertion hole of the opposing protruding piece are arranged on the same axis.

12. The intake manifold of claim 11.

14. a body member defining a portion of the surge tank and the plurality of branch pipes; a cover member that defines a portion of the surge tank and is joined to the body member; The protruding piece is formed on a wall portion of the main body member and a wall portion of the cover member.

10. The intake manifold according to claim 9, wherein:

15. The opposing wall portion is formed on the cover member.

15. The intake manifold of claim 14.

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