JP2005009488A - Intake manifold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a compact and highly rigid intake manifold which does not cause an increase in pressure loss of intake air or the turbulence of intake air, resulting from excessive bending of a port, and to obtain the intake manifold having a small number of component parts. <P>SOLUTION: In the intake manifold 10, an upper portion of a surge tank 14 is located at a height substantially equal to those of a plurality of suction holes 12A, 12B and 12C of a mounting flange 12, and is disposed near the suction hole 12A on the outermost side along the direction of arrangement (the direction indicated by an arrow D). Accordingly, because the surge tank 14 does not become an obstacle to arrangement of respective ports 20, 30 and 40, the intake manifold can be made compact, and it is not required to provide excessively bent portions in the respective ports 20, 30 and 40. Further, the intake manifold 10 is formed by joining and securing an upper component 10A, an intermediate component 10B, and a lower component 10C to one another. Therefore, it is possible to reduce the number of parts and realize the high rigidity. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an intake manifold, and more particularly to an intake manifold made of synthetic resin.

  2. Description of the Related Art Conventionally, there has been known an intake manifold constructed of a synthetic resin molded product in order to reduce weight and cost (see, for example, Patent Document 1).

  In the intake manifold disclosed in Patent Document 1, one end of each port is connected to the lower surface of a surge tank disposed near the lower side of the intake port of the engine, and each port has a surge tank. It is formed so as to be bent so that the other end of each port is disposed on the upper side of the surge tank. The other end of each port is connected to an intake flange for engine connection. Therefore, the length of each port connecting the engine and the surge tank is secured long, so the performance of the engine is improved, and the portability (compactness) of each port in the limited space of the engine room is improved. is doing.

  In addition, the throttle opening projecting on the upper surface of the surge tank is located between the adjacent ports in the vicinity of the intake flange (between the two ports in the center in the arrangement direction due to the necessity of uniform distribution to each port). Since it is arranged to project upward, the intake system can be easily set in the engine room.

  However, in the intake manifold disclosed in Patent Document 1, each port, surge tank, and the like are individually formed because each port has a complicated shape formed so as to be wound around the surge tank as described above. There is a problem that the number of parts and manufacturing man-hours increase due to molding.

  Moreover, since these constituent members are joined by welding or the like, there is a problem that the rigidity of the product itself deteriorates (particularly, it is difficult to ensure the strength of the joint portion between the intake flange and each port).

  Further, since the throttle opening projecting from the upper surface of the surge tank is arranged between adjacent ports in the vicinity of the intake flange, the adjacent port is partially enlarged around the throttle opening. There is also a problem that it is bent and causes an increase in intake pressure loss and disturbance of intake.

In addition, there exists patent document 2 as related patent document.
Japanese Patent Laid-Open No. 11-107870 JP 2000-73889 A

  In view of the above facts, the present invention has an object to obtain an intake manifold having a small number of parts and a compact and high rigidity, without causing an increase in intake pressure loss or an intake air disturbance due to excessive bending of a port. is there.

  In order to achieve the above object, the intake manifold according to the first aspect of the present invention is attached to a cylinder head of an engine and has intake holes formed at positions facing a plurality of intake ports provided in the cylinder head. The mounting flange and the throttle opening on the upper surface, the upper part being arranged at the same height as the plurality of intake holes of the mounting flange, and the outermost intake air along the arrangement direction of the plurality of intake holes A surge tank disposed near the hole, an upper part connected to each intake hole of the mounting flange and extending away from the engine, and a lower part from the upper part. A plurality of cylindrical ports in which an intermediate portion bent toward the lower portion and a lower portion extending from the intermediate portion to the lower surface of the surge tank are continuously formed. The cylindrical port includes the mounting flange, a plurality of port upper outer halves formed integrally with the mounting flange and constituting the upper half of the upper portion, and the outermost side along the arrangement direction. A surge tank upper part formed integrally with the port upper outer half and constituting the upper part of the surge tank; and a plurality of port upper inner halves constituting the lower half of the upper part. A body, the intermediate portion, a plurality of port lower inner halves constituting the upper half of the lower portion, and the outermost port upper inner halves along the arrangement direction, which are integrally molded with the surge A lower part forming a plurality of port lower outer halves constituting a lower half of the lower part of each cylindrical port; and an intermediate part constituting member comprising a surge tank lower part constituting the lower part of the tank And forming member, while being shaped by dividing into the upper component, said intermediate part forming element, and the lower component is formed by being joined and fixed to each other and characterized in that.

  In the intake manifold according to the first aspect, the surge tank is disposed at an upper portion thereof at the same height as the mounting flange, and is disposed near the outermost intake hole along the arrangement direction. A plurality of cylindrical ports each having one end connected to each intake hole of the mounting flange include an upper part extending in a direction away from the engine, and an intermediate part bent downward from the upper part. And a lower part extending from the intermediate part to the lower surface of the surge tank is continuously formed.

  Therefore, it is not necessary to provide an excessively bent portion for each cylindrical port, and the intake manifold itself can be formed compactly while ensuring the length of each cylindrical port. Moreover, since the surge tank is arranged near the outermost intake hole along the arrangement direction, the surge tank does not interfere with the arrangement of the cylindrical ports, and as described above, each cylindrical port. Unreasonable bending does not occur. This prevents an increase in intake pressure loss and disturbance of intake air.

  Further, the intake manifold is made of synthetic resin, and includes an upper component member in which a mounting flange, a plurality of port upper outer halves and a surge tank upper split are integrally formed, and a plurality of port upper inner halves. An intermediate part member in which an intermediate portion of the cylindrical port, a plurality of lower port inner halves, and a surge tank lower part are integrally formed, and a lower member formed by integrally forming a plurality of port lower outer halves The upper component member, the intermediate component member, and the lower component member are joined and fixed to each other. Therefore, the rigidity of the product itself, particularly the rigidity of the surge tank and the rigidity of the connection portion between the mounting flange and each cylindrical port are ensured with a small number of parts.

  Thus, the intake manifold according to claim 1 does not cause an increase in intake pressure loss or disturbance of intake due to excessive bending of the port, and has a small number of parts and is compact and highly rigid.

  As described above, according to the intake manifold of the present invention, there is no increase in intake pressure loss or disturbance of intake due to excessive bending of the port, and the number of components is small, and the rigidity is high.

  FIG. 2 is a front view of intake manifold 10 according to the embodiment of the present invention. FIG. 3 shows a top view of intake manifold 10 according to the embodiment of the present invention. Further, FIG. 4 shows a side view of intake manifold 10 according to the embodiment of the present invention.

  In the following description, the vertical direction indicating directionality indicates a direction in a state where the intake manifold 10 is attached to an engine (not shown).

  As shown in FIGS. 2 to 4, the intake manifold 10 includes a mounting flange 12, a surge tank 14, and a plurality of (in this embodiment, three, because the engine has three cylinders) cylindrical ports 20, 30 and 40. The mounting flange 12, the surge tank 14, and the ports 20, 30, and 40 are all made of a hard synthetic resin such as nylon.

  A plurality of mounting bolt holes 13 are formed in the mounting flange 12. A mounting bolt (not shown) is passed through the mounting bolt hole 13, and the mounting bolt 12 is fastened to the side surface of the cylinder head of the engine (not shown), so that the mounting flange 12 is attached to the side surface of the cylinder head of the engine. ing.

  The mounting flange 12 is formed with intake holes 12A, 12B, and 12C at positions facing a plurality of intake ports (not shown) provided in the cylinder head (see FIG. 3). One end of each port 20, 30, 40 is connected to each intake hole 12A, 12B, 12C, and each port 20, 30, 40 is directed away from the engine (mounting flange 12). The upper portion “U” is extended, and each intermediate portion is smoothly bent downward to form first bent portions 20A, 30A, and 40A, respectively.

  As shown in FIG. 3, the distances from the mounting flange 12 of each port 20, 30, 40 to the first bent portions 20A, 30A, 40A are different from each other. In FIG. The length is set so as to increase stepwise over the left port 20A.

  Then, below each first bent portion 20A, 30A, 40A, each intermediate portion of each port 20, 30, 40 is smoothly bent toward the surge tank 14 provided near the port 20, respectively. Thus, second bent portions 20B, 30B, and 40B are formed. In this case, the intermediate portion “M” is between the first bent portion 20A and the second bent portion 20B, between the first bent portion 30A and the second bent portion 30B, and between the first bent portion 40A and the second bent portion 40B. It is said that. And each port 20, 30, 40 which was made into the lower part "L" from each 2nd bending part 20B, 30B, 40B and went to the surge tank 14 side, each other end part connected to the lower surface of the surge tank 14, respectively Has been.

  The surge tank 14 has a substantially bottomed cylindrical shape with a throttle opening 16 formed on the upper surface, and an upper outer periphery is formed integrally with the port 20. As shown in FIG. 4, the upper portion of the surge tank 14 is arranged at the same height as the intake holes 12A, 12B, 12C of the mounting flange 12, and as shown in FIG. In FIG. 3, it is arranged near the intake hole 12A on the left side). The arrangement direction is the arrangement direction of the intake holes 12A, 12B, and 12C (arrow D direction), and in FIGS. 1 to 3, the horizontal direction in the illustrated state.

  Here, as shown in FIG. 1, the intake manifold 10 according to the present embodiment includes an upper component member 10 </ b> A, an intermediate component member 10 </ b> B, and a lower component member 10 </ b> C, which are three independent hard synthetic resin members. They are formed by being bonded and fixed to each other by welding or the like.

  The upper constituent member 10 </ b> A constitutes an upper part of the intake manifold 10 and has a mounting flange 12.

  The mounting flange 12 has a plurality of semi-cylindrical shapes that constitute the upper half of the upper portion “U” (portion from the mounting flange 12 to each of the first bent portions 20A, 30A, 40A) of each port 20, 30, 40. Port upper outer halves 21, 31, 41 are integrally formed.

  In addition, the outermost port upper outer half 21 along the arrangement direction has a surge tank upper divided body 14A constituting the upper portion of the surge tank 14 on the side opposite to the port upper outer halves 31, 41. , It is molded integrally.

  That is, the upper structural member 10A is formed by integrally forming the mounting flange 12, the port upper outer halves 21, 31, 41, and the surge tank upper divided body 14A with a hard synthetic resin material.

  On the other hand, the intermediate portion constituting member 10B constitutes an intermediate portion of the intake manifold 10 and corresponds to each of the ports 20, 30 corresponding to the port upper outer halves 21, 31, 41 of the upper constituting member 10A described above. , 40 has a plurality of semi-cylindrical port upper inner halves 22, 32, 42 that constitute the lower half of the upper portion “U”. As shown in FIG. 4, the port upper inner half 22 is not in contact with the mounting flange 12, and the connection portion of the port 20 to the mounting flange 12 is cylindrical. The same applies to the ports 30 and 40.

  The outermost port upper inner half 22 along the arrangement direction is integrally provided with a surge tank lower divided body 14B constituting the lower portion of the surge tank 14 on the side opposite to the port upper inner halves 32, 42. It is molded into.

  Further, on the lower surface of the lower part of the surge tank lower part 14B, a plurality of semi-cylindrical port lower inner halves 24, 34, 44 constituting the upper half of the lower part “L” of each port 20, 30, 40 are provided. The tip of is integrally molded.

  Between the port upper inner halves 22, 32, 42 and the port lower inner halves 24, 34, 44, cylindrical connecting portions 23, 33 constituting the intermediate portion “M” are provided. , 43, and the upper port inner halves 22, 32, 42 and the lower port inner halves 24, 34, 44 are integrally formed via the connecting portions 23, 33, 43. It is a configuration.

  That is, the intermediate portion constituting member 10B includes the port upper inner halves 22, 32, 42, the connecting portions 23, 33, 43, the port lower inner halves 24, 34, 44, and the surge tank lower divided body 14B. Are integrally formed of a hard synthetic resin material.

  On the other hand, the lower component member 10C constitutes a lower portion of the intake manifold 10 and corresponds to the port lower inner halves 24, 34, 44 of the intermediate component member 10B described above. , 30, and 40, a plurality of semi-cylindrical port lower outer halves 25, 35, and 45 constituting the lower half of the lower portion “L” are integrally formed with each other. 4, the port lower outer halves 25, 35, 45 are not in contact with the surge tank lower split 14B, and the port lower inner halves 24, 34, 44 have a surge tank lower split. 14B has a cylindrical shape, and as shown in FIG. 3, these port lower inner halves 24, 34, and 44 are separately communicated to the bottom surface of the surge tank lower divided body 14B. .

  That is, the lower component member 10C is formed by integrally forming the lower port outer halves 25, 35, and 45 with a hard synthetic resin material.

  The opposing edge portions of the upper component member 10A, the intermediate component member 10B, and the lower component member 10C are extended toward the outside to form a flange joint surface 18. Then, the upper component member 10A, the intermediate component member 10B, and the lower component member 10C are configured to form the intake manifold 10 by bonding the respective joint surfaces 18 to each other and welding and fixing them. is there.

  The cylinder axis direction of the upper portion “U” (portion from the mounting flange 12 to each first bent portion 20A, 30A, 40A) of each port 20, 30, 40 is the X axis (each intake hole 12A) in FIG. , 12B, and 12C are substantially orthogonal to each other and arranged in parallel with each other and at the same height. In addition, the cylinder axis direction of the lower portion “L” of each port 20, 30, 40 is substantially perpendicular to the Y axis (axis inclined at a predetermined angle with respect to the X axis) in FIG. Arranged in height. Therefore, it is easy to set the dividing surface of each port 20, 30, 40 at the time of forming the mold, and the ports 20, 30, 40 bent in a complicated manner can be easily molded and easily joined.

  In addition, the setting positions of the first bent portions 20A, 30A, 40A and the second bent portions 20B, 30B, 40B are designed to move in the port cylinder axis direction according to the design convenience of the ports 20, 30, 40. It can be changed.

  Next, the operation of the embodiment of the present invention will be described.

  In the intake manifold 10 having the above-described configuration, the surge tank 14 has an upper portion arranged at the same height as the plurality of intake holes 12A, 12B, 12C of the mounting flange 12 and the outermost side in the arrangement direction (in FIG. It is arranged near the intake hole 12A on the left side). The plurality of ports 20, 30, 40, each having one end connected to each intake hole 12 </ b> A, 12 </ b> B, 12 </ b> C of the mounting flange 12, have an upper portion “U” extending in a direction away from the engine An intermediate part “M” bent downward from the upper part “U” and a lower part “L” extending from the intermediate part “M” to the lower surface of the surge tank 14 are continuously formed.

  Therefore, it is not necessary to provide an excessively bent portion for each port 20, 30, 40, and the intake manifold 10 itself can be formed compactly while ensuring the length of each port 20, 30, 40 long.

  Moreover, since the surge tank 14 is disposed near the outermost intake hole 12A along the arrangement direction (the direction of arrow D in FIGS. 1 to 3), the surge tank 14 is connected to each port 20, 30, 40. There is no hindrance to the arrangement, and as described above, excessive bending does not occur in each of the ports 20, 30, and 40. This prevents an increase in intake pressure loss and disturbance of intake air.

  Further, the intake manifold 10 is formed by being divided into an upper component member 10A, an intermediate component member 10B, and a lower component member 10C, respectively, by a hard synthetic resin material, and the upper component member 10A and the intermediate component member. 10B and the lower component member 10C are formed by bonding and fixing the bonding surfaces 18 to each other. Therefore, it can be easily configured with a small number of parts.

  Further, in the upper component member 10A, the mounting flange 12, the port upper outer halves 21, 31, 41, and the surge tank upper divided member 14A are integrally formed. Since the inner halves 22, 32, 42, the connecting parts 23, 33, 43, the respective port lower inner halves 24, 34, 44, and the surge tank lower part 14B are integrally formed, the product itself Rigidity (in particular, the rigidity of the surge tank 14 and the rigidity of the connection portion between the mounting flange 12 and each of the ports 20, 30, 40) is ensured.

  Moreover, in the upper component member 10A, the intermediate component member 10B, and the lower component member 10C, each of the cylindrical ports 20, 30, 40 is formed as a semi-cylindrical half, and Since the surge tank 14 is also configured to be divided into a surge tank upper divided body 14A and a surge tank lower divided body 14B, the resin can be easily molded with a small number of molds, and the cost can be reduced. Can be planned.

  In addition, the half split position along the cylinder axis direction of each port 20, 30, 40 can be changed to a different position adjusted within the range where the molding process can be performed without necessarily dividing the half cylindrical position accurately. Of course.

  As described above, the intake manifold 10 having the above-described configuration does not cause an increase in intake pressure loss or disturbance of intake due to excessive bending of the ports 20, 30, 40, and is compact and highly rigid with a small number of parts.

It is a perspective view which shows the intake manifold which concerns on embodiment of this invention. It is a front view which shows the intake manifold which concerns on embodiment of this invention. It is a top view which shows the intake manifold which concerns on embodiment of this invention. It is a side view which shows the intake manifold which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Intake manifold 10A Upper structural member 10B Middle structural member 10C Lower structural member 12 Mounting flange 12A, 12B, 12C Intake hole 14 Surge tank 14A Surge tank upper divided body 14B Surge tank lower divided body 16 Throttle opening 20, 30, 40 Tubular port 21, 31, 41 Port upper outer half 22, 32, 42 Port upper inner half 24, 34, 44 Port lower inner half 25, 35, 45 Port lower outer half U Upper part M Middle part L Lower part

Claims (1)

A mounting flange that is attached to the cylinder head of the engine and that has intake holes formed at positions facing the plurality of intake ports provided in the cylinder head;
The upper surface has a throttle opening, the upper part is arranged at the same height as the plurality of intake holes of the mounting flange, and is arranged near the outermost intake hole along the arrangement direction of the plurality of intake holes A surge tank,
An upper part connected to each intake hole of each of the mounting flanges and extending away from the engine, an intermediate part bent downward from the upper part, and the intermediate part A plurality of cylindrical ports formed continuously from the lower part to the bottom surface of the surge tank,
And the cylindrical port is
The mounting flange, a plurality of port upper outer halves formed integrally with the mounting flange to form the upper half of the upper portion, and the outermost port upper outer halves along the arrangement direction A surge tank upper divided body that is molded and constitutes the upper part of the surge tank; and an upper component member comprising:
A plurality of port upper inner halves constituting the lower half of the upper part, the intermediate part, a plurality of port lower inner halves constituting the upper half of the lower part, and along the arrangement direction A middle part constituting member comprising a surge tank lower part formed integrally with the outermost port upper inner half and constituting a lower part of the surge tank;
A lower component constituting a plurality of port lower outer halves constituting the lower half of the lower part of each cylindrical port;
The upper component member, the intermediate component member, and the lower component member are joined and fixed to each other.
Intake manifold characterized by that.

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