JP2015025438A - Intake manifold for internal combustion engine - Google Patents

Abstract

In an intake manifold for an internal combustion engine, a sealing performance at a connecting portion of a throttle body is improved.
In an intake manifold for an internal combustion engine having a plurality of branch pipes, nut members are respectively accommodated in a plurality of nut insertion holes a to a connection flange to which a throttle body is connected. The flange portion 50 of the nut member 40 is disposed so as to overlap with the seal ring 38 mounted on the mounting surface 34 of the connection flange 28 in the thickness direction. Therefore, when connecting the throttle body 26 to the connection flange 28, the nut member 40 is pulled toward the housing 56 under the screwing action of the fastening bolt 30 with the seal ring 38 in contact with the housing 56. Thus, the seal ring 38 is pressed toward the housing 56 and comes into close contact therewith.
[Selection] Figure 3

Description

  The present invention relates to an intake manifold for an internal combustion engine having a branch pipe for supplying air to the internal combustion engine.

  2. Description of the Related Art Conventionally, in a multi-cylinder engine such as an automobile, an intake manifold for an internal combustion engine is provided between an intake port of a cylinder head and a throttle valve that adjusts an intake air amount, and the intake air taken into the intake manifold for the internal combustion engine Is distributed to each intake port. In such an intake manifold, for example, as disclosed in Patent Document 1, an intake port into which air is introduced opens at an end thereof, and a throttle body is mounted on a mounting flange in which the intake port is opened. . The flow rate of air flowing from the upstream side to the intake port is adjusted by opening and closing the throttle valve of the throttle valve.

JP 2011-241685 A

  In the intake manifold as described above, a seal member is provided between the throttle body and the mounting flange to prevent leakage of air flowing to the intake port through the inside of the throttle body. There is a request to improve the sex.

  The present invention has been made in consideration of the above-described problems, and an object of the present invention is to provide an intake manifold for an internal combustion engine that can improve the sealing performance at a connection portion with a throttle body.

In order to achieve the above object, the present invention provides an intake manifold for an internal combustion engine having a connection flange to which a throttle body is connected and formed of a resin material having an intake port for taking in air in the connection flange. In
The connection flange includes a seal member attached via a seal groove to a connection surface to which the throttle body is connected,
A bolt having a bolt inserted through the throttle body and screwed together, and a nut having a flange portion widened to the outer peripheral side with respect to the fastener,
With
The seal member and the flange portion of the nut are arranged so as to overlap in the fastening direction of the bolt and the nut.

  According to the present invention, the connection flange in the intake manifold for the internal combustion engine is provided with a seal member on the connection surface to which the throttle body is connected and a nut into which a bolt inserted into the throttle body is screwed. The nut is formed with a fastening portion to which the bolt is fastened and a flange portion widened to the outer peripheral side with respect to the fastening portion.

  And, when the throttle body is connected to the connection flange by arranging the flange portion of the nut and the seal member so as to overlap in the fastening direction of the bolt and nut, the nut flange portion is brought under the screwing action of the bolt. Since the applied tensile force presses the sealing member against the throttle body, the sealing member more securely adheres to the throttle body, and accordingly, the sealing performance between the connection flange and the throttle body in the intake manifold. Can be improved.

  Further, the flange portion may be arranged so as to overlap with a rectangular region having four sides in contact with the inner peripheral surface of the intake port. Thus, by arranging the flange portion in the area of the connection flange excluding the suction port from the rectangular area, the area can be used effectively, and accordingly, the pitch between the nuts can be reduced. Therefore, it is possible to reduce the size of the connection flange.

  Further, the nut may be formed in a T-shaped cross section from the fastening portion and the flange portion.

  According to the present invention, the following effects can be obtained.

  That is, the connection flange in the intake manifold for the internal combustion engine is provided with a seal member on the connection surface to which the throttle body is connected, and a nut into which a bolt inserted into the throttle body is screwed. A fastening portion to which the bolt is fastened and a flange portion widened to the outer peripheral side with respect to the fastening portion are formed.

  And, when the throttle body is connected to the connection flange by arranging the flange portion of the nut and the seal member so as to overlap in the fastening direction of the bolt and nut, the nut flange portion is brought under the screwing action of the bolt. As a result, the sealing member is pressed against the throttle body by the applied tensile force, and the sealing member is more firmly attached to the throttle body. As a result, the sealing performance between the connection flange and the throttle body in the intake manifold can be improved.

1 is an overall front view of an intake manifold for an internal combustion engine according to an embodiment of the present invention. FIG. 2 is a front view of a connection flange in the intake manifold for the internal combustion engine shown in FIG. 1. It is sectional drawing along the III-III line of FIG. It is sectional drawing along the IV-IV line of FIG.

  A preferred embodiment of an intake manifold for an internal combustion engine according to the present invention will be given and described in detail below with reference to the accompanying drawings. In FIG. 1, reference numeral 10 indicates an intake manifold for an internal combustion engine according to an embodiment of the present invention.

  This intake manifold for internal combustion engines (hereinafter referred to as an intake manifold) is used in, for example, a four-cylinder internal combustion engine having four cylinder chambers mounted on a vehicle or the like.

  As shown in FIG. 1, the intake manifold 10 is formed of, for example, a thermoplastic resin, and includes a branch pipe 12 having a plurality of branch passages, and a surge tank 14 to which one end of the branch pipe 12 is connected. And a connecting portion 18 provided at one end portion along the longitudinal direction (arrow A, B direction) of the surge tank 14 via an introduction pipe 16.

  The branch pipe 12 is formed with a predetermined width in the longitudinal direction of the surge tank 14 (in the directions of arrows A and B), and is directed from one end connected to the surge tank 14 to the other end connected to the cylinder head of the internal combustion engine. It is formed in a cross-sectional curved shape. One end of the branch pipe 12 is connected to the surge tank 14, a plurality of branch passages are formed in the extending direction, and the other end is attached to a cylinder head of an internal combustion engine (not shown). A mounting flange 20 is formed.

  The mounting flange 20 is integrally formed along the longitudinal direction of the surge tank 14, and a lead-out port 22 communicating with the branch passage is formed on each end surface thereof. In addition, a fastening hole 24 is formed in the mounting flange 20 between the outside of the lead-out port 22 and between the lead-out ports 22, and bolts (not shown) are inserted into the fastening holes 24 and screwed into a cylinder head (not shown). As a result, the other end of the branch pipe 12 is fixed to the end face of the cylinder head via the mounting flange 20.

  The plurality of branch pipes 12 are formed at equal intervals along the longitudinal direction (arrow A, B direction) of the surge tank 14.

  The connecting portion 18 is provided on the side of the surge tank 14, that is, on one end side (in the direction of arrow A) along the longitudinal direction of the surge tank 14. For example, the connecting portion 18 is formed in a substantially rectangular shape and connected to the throttle body 26. A connecting flange 28. The connection flange 28 is, for example, a plate having a predetermined thickness, and is formed to be orthogonal to the longitudinal direction of the surge tank 14 and the connection flange 28, and the throttle body 26 is mounted via a plurality of fastening bolts 30. The

  Further, as shown in FIGS. 1 and 2, an intake port 32 penetrating in the thickness direction (arrow C direction) is opened in a circular shape in the center of the connection flange 28, and is introduced into the intake port 32. The pipe 16 communicates with the mounting surface 34 on which the throttle body 26 is mounted. A seal ring 38 is mounted on the annular groove 36 on the outer peripheral side of the intake port 32. The seal ring 38 is formed of an elastic material such as rubber, for example, and is provided so as to protrude from the mounting surface 34 by a predetermined height when mounted in the annular groove 36 (see FIG. 4).

  On the other hand, as shown in FIG. 2, four nut insertion holes 42 a to 42 d to which the nut member 40 is attached are formed at the four corners of the connection flange 28. The nut insertion holes 42a to 42d open toward the one side surface 28a and the other side surface 28b of the connection flange 28, and as shown in FIGS. 2 to 4, the main body portion 44 formed in a rectangular cross section, and the main body The section 44 is formed in a substantially T-shaped cross section formed of a narrow section 46 having a circular cross section formed at the center in the width direction and extending toward the mounting surface 34 (in the direction of arrow C1 in FIGS. 3 and 4). The The narrow portion 46 extends in a straight line in a direction away from the main body portion 44 and opens toward the mounting surface 34 (arrow C1 direction).

  Further, as shown in FIG. 2, the main body portion 44 is formed so that the corner portion 48 closest to the intake port 32 overlaps with the annular groove 36 in the thickness direction (arrow C direction) of the connection flange 28. Yes.

  The nut insertion holes 42a to 42d are opened one by one on the side surface 28a and the other side surface 28b that are formed symmetrically with respect to the intake port 32 in the connection flange 28, respectively. In other words, the nut insertion holes 42a and 42b formed on the one side surface 28a of the connection flange 28 and the nut insertion holes 42c and 42d formed on the other side surface 28b are arranged in a straight line.

  The nut member 40 is formed, for example, in a substantially T-shaped cross section having a flange portion 50 formed in a rectangular cross section and a cylindrical portion 52 protruding in a cylindrical shape from the center of the flange portion 50. A bolt hole 54 in which a screw is engraved is formed on the inner peripheral surface so as to penetrate from the center of 52 to the flange portion 50. The plurality of nut members 40 are respectively inserted into the nut insertion holes 42a to 42d from the side surface 28a and the other side surface 28b of the connection flange 28, the flange portion 50 is inserted into the main body portion 44, and the cylinder portion 52 is wide. By being inserted into the narrow portion 46, the nut is inserted into the nut insertion holes 42a to 42d.

  At this time, the nut insertion holes 42 a to 42 d are formed such that the main body 44 and the narrow portion 46 are larger than the cross-sectional shape of the nut member 40, so that the nut member 40 protrudes outside the connection flange 28. There is no. Specifically, the nut insertion holes 42 a to 42 d are formed so that the width dimension and the height dimension of the main body 44 are larger than the width dimension and the thickness dimension of the flange portion 50 in the nut member 40, and the diameter of the narrow portion 46. Is formed larger than the outer peripheral diameter of the cylindrical portion 52. That is, the nut member 40 is provided with a slight clearance between the inner wall surfaces of the nut insertion holes 42a to 42d, and is accommodated so as to be slightly movable.

  Further, as shown in FIGS. 3 and 4, the nut member 40 has a corner portion 48 that overlaps in the thickness direction (arrow C direction) of the seal ring 38 and the connection flange 28 inside the main body portion 44. Be placed. In other words, the flange portion 50 of the nut member 40 is arranged so that a part thereof is in a rectangular region (a two-dot chain line shape in FIG. 2) configured by four sides contacting the intake port 32.

  The throttle body 26 mounted on the connection flange 28 is connected to an intake duct (not shown) at an upstream end thereof, and is connected to the connection flange 28 at a downstream end thereof. The throttle body 26 includes a housing 56 that is formed of a material having rigidity higher than that of the intake manifold 10 including the connection flange 28, for example, a metal material, and has a throttle valve that is rotatable inside. The four fastening bolts 30 inserted through the insertion holes 58 along the axial direction (in the direction of arrow C in FIG. 3) with the end abutting against the mounting surface 34 of the connection flange 28 are respectively attached to the nut members 40. It is fixed by screwing together. At this time, the annular seal ring 38 mounted on the mounting surface 34 abuts on the end of the housing 56, thereby preventing air leakage between the housing 56 and the connection flange 28.

  Then, when outside air or inside air taken in from the intake duct passes through the housing 56 of the throttle body 26, the flow rate is adjusted by the throttle valve, and then the surge tank is connected via the intake port 32 of the connection flange 28 in the intake manifold 10. 14 and distributed to a plurality of branch pipes 12, respectively.

  The intake manifold 10 for an internal combustion engine according to the embodiment of the present invention is basically configured as described above. Next, a case where the throttle body 26 is assembled to the connection flange 28 of the intake manifold 10 will be described. .

  First, the nut members 40 are inserted into the nut insertion holes 42a to 42d in the connection flange 28, respectively. Specifically, a set of nut members 40 are brought close to the one side surface 28a and the other side surface 28b of the connection flange 28, and the flange portion 50 is moved to the main body portion 44 and the cylindrical portion 52 is moved to the narrow portion 46. And insert. At this time, since the main body portion 44 and the narrow portion 46 of the nut insertion holes 42a to 42d are formed larger than the flange portion 50 and the cylindrical portion 52 of the nut member 40, the insertion operation is easy. The nut member 40 is accommodated in the nut insertion holes 42a to 42d so as to be slightly movable. Further, as shown in FIG. 4, the end surface of the cylindrical portion 52 is disposed so as to be on the mounting surface 34 side (arrow C1 direction) of the connection flange 28, and the corner portion 48 of each nut member 40 is sealed. It arrange | positions so that it may overlap in the thickness direction (arrow C direction) of the ring 38 and the connection flange 28 (refer FIG.2 and FIG.4).

  Next, as shown in FIG. 3, the end of the housing 56 in the throttle body 26 is brought into contact with the mounting surface 34 of the connection flange 28, and the seal ring 38 is brought into contact with the end on the outer peripheral side of the intake port 32. The four fastening bolts 30 inserted through the insertion holes 58 of the housing 56 are screwed into the bolt holes 54 of the nut member 40 respectively. Then, when the fastening bolt 30 is rotated by a tool (not shown), the screwed nut member 40 is pulled toward the throttle body 26 (in the direction of the arrow C1) and moves inside the nut insertion holes 42a to 42d.

  The flange portion 50 of the nut member 40 abuts against the inner wall portion 60 that is the boundary between the main body portion 44 and the narrow portion 46, whereby further movement toward the throttle body 26 (in the direction of the arrow C1) is restricted, and the connection flange 28, the housing 56 of the throttle body 26 is fixed, and the assembly work of the throttle body 26 is completed.

  At this time, a pressing force directed toward the throttle body 26 (in the direction of the arrow C1) is generated in the main body 44 of the nut member 40 by tightening with the fastening bolt 30, and this pressing force is in the thickness direction of the connection flange 28. In this case, the seal ring 38 is pressed toward the housing 56 (in the direction of the arrow C1) and is more closely attached to the housing 56. As a result, the sealing performance is improved.

  In other words, the flange body 50 and the seal ring 38 of the nut member 40 are arranged so as to overlap with the fastening bolt 30 and the fastening direction (arrow C direction) of the nut member 40, so that the throttle body 26 and the connection flange 28 are connected. The sealing performance can be improved.

  As described above, in the present embodiment, in the intake manifold 10, the connection flange 28 to which the throttle body 26 is connected is sealed via the annular groove 36 at a position on the outer peripheral side of the intake port 32 through which air is introduced. A ring 38 is provided, and the nut member 40 is inserted into the nut insertion holes 42a to 42d. The flange body 50 of the nut member 40 and the seal ring 38 are arranged so as to overlap in the thickness direction (arrow C direction) of the connection flange 28, thereby connecting the throttle body 26 to the connection flange 28. At this time, the tensile force applied to the nut member 40 under the screwing action of the fastening bolt 30 is applied as a pressing force that presses the seal ring 38 toward the throttle body 26 (in the direction of the arrow C1).

  As a result, the connection flange 28 and the throttle of the intake manifold 10 can be simply arranged in the connection flange 28 so that the flange portion 50 of the nut member 40 and the seal ring 38 are overlapped in the fastening direction (arrow C direction). The sealing property between the body 26 can be improved.

  Further, in the connection flange 28, by arranging the corner portion 48 of the nut member 40 close to the inlet 32 side, that is, the inner peripheral side, the pitch between the adjacent nut members 40 can be reduced. Accordingly, the connection flange 28 can be reduced in size. Further, since the mounting pitch of the throttle body 26 is reduced, the throttle body 26 can be more firmly fixed to the connection flange 28.

  Further, since the nut member 40 is accommodated in the nut insertion holes 42a to 42d so as to be slightly movable, for example, manufacturing variations occur in the intake manifold 10 and the throttle body 26 including the connection flange 28, and the fastening bolt is fixed at a predetermined position. Even when it is difficult to fasten the nut 30 and the nut member 40, the throttle body 26 can be easily fastened and connected to the throttle body 26 by moving the nut member 40 according to the manufacturing variation.

  Of course, the intake manifold for an internal combustion engine according to the present invention is not limited to the above-described embodiment, and various configurations can be adopted without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Intake manifold for internal combustion engines 12 ... Branch pipe 14 ... Surge tank 16 ... Inlet pipe 18 ... Connection part 20 ... Mounting flange 22 ... Derivation port 24 ... Fastening hole 26 ... Throttle body 28 ... Connection flange 30 ... Fastening bolt 36 ... Ring Groove 38 ... Seal ring 40 ... Nut members 42a-42d ... Nut insertion hole 44 ... Main body 46 ... Narrow part 48 ... Corner part 50 ... Flange part 52 ... Tube part 54 ... Bolt hole 56 ... Housing

Claims (3)

In an intake manifold for an internal combustion engine that has a connection flange to which a throttle body is connected and is formed from a resin material provided with an intake port for taking in air in the connection flange.
The connection flange includes a seal member mounted via a seal groove on a connection surface to which the throttle body is connected;
A bolt inserted into the throttle body is screwed together, and a nut having a fastening part to which the bolt is fastened, and a flange part widened to the outer peripheral side with respect to the fastening part,
With
An intake manifold for an internal combustion engine, wherein the seal member and a flange portion of the nut are arranged so as to overlap in a fastening direction of the bolt and the nut. The intake manifold for an internal combustion engine according to claim 1,
The intake manifold for an internal combustion engine, wherein the flange portion is disposed so as to overlap with a rectangular region having four sides in contact with an inner peripheral surface of the intake port. The intake manifold for an internal combustion engine according to claim 1 or 2,
The intake manifold for an internal combustion engine, wherein the nut is formed in a T-shaped cross section from the fastening portion and the flange portion.

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