JP2516474Y2 - Internal combustion engine intake collector - Google Patents

Description

TECHNICAL FIELD The present invention relates to an intake collector to which the base ends of a plurality of passages leading to each cylinder are connected in an intake system of a multi-cylinder internal combustion engine.

2. Description of the Related Art Many multi-cylinder internal combustion engines, especially many fuel injection type internal combustion engines,
An intake collector having an appropriate volume is provided to prevent intake interference in each cylinder, and a plurality of outlet passages branched from the intake collector are connected to intake ports of each cylinder.

For example, Japanese Patent Laid-Open No. 61-101661 discloses an elongated box-shaped intake collector 21 having a substantially rectangular cross section as shown in FIG. A plurality (specifically, four) of outlet passages 22 are formed along one side of the bottom surface of the intake collector 21. The intake inlet (not shown) is formed at one end of the intake collector 21 in the longitudinal direction.

Problems to be Solved by the Invention Conventionally, the intake collector 21 in the intake system is treated as a mere volume portion, and therefore, from the inside thereof, the outlet passage
No consideration is given to the flow of intake air reaching 22.
For example, in the above-mentioned conventional example, in order to make the layout of the intake system compact, the outlet passage 22 is connected along one side wall surface 21a of the intake collector 21 and is far from the center of the cross section of the intake collector 21. It opens in a direction. Therefore, the intake air in the intake air collector 21 is not always smoothly guided to the outlet passage 22, and the intake resistance increases accordingly.

Means for Solving the Problems The present invention is directed to a plurality of outlet passage openings having an intake inlet at one end in the longitudinal direction and extending in a direction substantially orthogonal to the longitudinal direction, which are sequentially arranged along the longitudinal direction. An intake collector of an internal combustion engine, which has a flat bottom surface on which the plurality of openings are open, and in a longitudinal range including the plurality of openings, a cross section of each part taken along a plane orthogonal to the longitudinal direction. Form a substantially triangular shape similar to each other, the ridge line connecting the tops facing the bottom surface in each cross section in the longitudinal direction, when projected onto the bottom surface, approximately in the center of the bottom surface in each cross section. It is characterized in that it is located, the opening is located substantially in the center of the bottom surface in each cross section, and an outlet passage reaching the opening is formed so as to face the ridge.

The intake air that has entered the intake collector from the intake inlet flows along the tops of the substantially triangular cross sections and is smoothly guided to the outlet passages.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show an intake collector 1 for a four-cylinder engine as an example.

The intake collector 1 has an elongated shape along the cylinder column direction of the internal combustion engine, and an intake inlet 2 is formed at one end thereof (see FIG. 2). The four short branch portions 3 each form an outlet passage 4, and the four openings 4a at the base end of the outlet passage 4 are arranged along the longitudinal direction of the intake collector 1. A flange portion 5 for attaching the intake collector 1 to a throttle chamber (not shown) is formed at the tip of the branch portion 3.

FIG. 1 shows a cross section orthogonal to the longitudinal direction of the intake collector 1, more specifically, a cross section taken along the branch portion 3 for the # 4 cylinder closest to the intake inlet 2. 5 and 6 show cross sections along the # 3 cylinder branch section 3 and the # 2 cylinder branch section 3, respectively. As is apparent from these cross-sectional views, the intake collector 1 has a flat bottom surface 6
The outlet passage 4 is opened along the substantial center of each cross section of the bottom face 6 while leaving a flat portion of the bottom face 6 around. The periphery of the opening 4a is formed into an appropriate R surface so that the intake air smoothly flows in from the entire circumference of the opening 4a.

In addition, the cross-sectional shape of the intake collector 1 is a substantially triangular shape, more specifically, a shape such that two sides of an isosceles triangle are swollen outward and each corner is rounded. The cross-section of each part has a substantially similar shape. Therefore, the line connecting the apexes 7 of the substantially triangular shape, that is, the ridge line 1 becomes a straight line as shown in FIG. 3, and is along the approximately center of each cross section of the bottom face 6. As shown in the drawing, the cross-sectional area of the intake collector 1 is #
It gradually decreases from the 4-cylinder side toward the # 1 cylinder side, which prevents deviation of the intake air flow rate toward the # 1 cylinder side due to the inertia of the intake air.

Further, in each of the outlet passages 4 of the # 1 to # 4 cylinders, the outlet passage 4 is formed so as to face the ridge line 1 so that the center line m of the outlet passage 4 intersects with the ridge line 1 described above.

In the illustrated example, the intake collector 1 includes a body member 11 including a bottom surface 6 and a branch portion 3 and an intake inlet 2
It is divided into two parts, that is, a cover member 12 including a part, and cast, and is integrated by bolting peripheral flange portions 13 and 14 to each other. This is in consideration of productivity during casting.

FIG. 4 shows the inside of the body member 11 with the cover member 12 removed. As shown in FIG. 4 and FIG. 2, the outlet passage 4 in each branch portion 3 is
The longitudinal direction of the intake collector 1 is connected to the bottom surface 6 in a slightly inclined form so as to follow the flow of the intake air that has flowed in from the intake inlet 2.

Reference numeral 15 is a connector for extracting auxiliary air, which is attached to the bottom surface 6.

Now, in the above configuration, the intake air that has entered from the intake inlet 2 flows along the top portion 7 of the intake collector 1, that is, along the ridge line 1. With respect to this intake main flow, each outlet passage 4 is opened so as to face the ridge line 1 thereof, and moreover, it is opened substantially in the center of the bottom face 6 without being offset to the left and right, so that each opening from the inside of the intake collector 1 The intake air is guided very smoothly to the portion 4a. Therefore, the intake resistance becomes extremely small. Further, with respect to the longitudinal direction of the intake collector 1, since the outlet passage 4 is slightly inclined along the intake air flow, the intake resistance is further suppressed.

Further, since the cross-sectional area of the intake collector 1 is reduced from the intake inlet 2 toward the # 1 cylinder branch portion 3, the intake air amounts of the # 1 to # 4 cylinders can be evenly distributed.

Effects of the Invention As is clear from the above description, the intake collector for the internal combustion engine according to the present invention can smoothly guide the intake air from the inside of the intake collector to the plurality of outlet passages. The intake resistance can be made very small.

[Brief description of drawings]

1 is a sectional view taken along the line I--I of FIG. 2 showing an embodiment of the intake collector according to the present invention, FIG. 2 is a top view of the same embodiment, FIG. 3 is a front view of the same, and FIG. FIG. 4 is a front view of only the body member, and FIGS. 5 and 6 are V of FIG. 2, respectively.
FIG. 7 is a sectional view taken along line -V and line VI-VI, and FIG. 7 is a sectional view showing a conventional intake collector. 1 ... intake collector, 2 ... intake inlet, 4 ... outlet passage, 7 ... top.

Claims (1)

(57) [Scope of utility model registration request] 1. An intake collector for an internal combustion engine, which has an intake inlet at one end in the longitudinal direction, and in which openings of a plurality of outlet passages extending in a direction substantially orthogonal to the longitudinal direction are sequentially arranged along the longitudinal direction. While having a flat bottom surface where the plurality of openings are open, in the longitudinal range including the plurality of openings, the cross-sections of the respective parts along the plane orthogonal to the longitudinal direction are substantially similar to each other. A ridge line formed in a triangular shape and connecting the apexes facing each other in the cross section in the longitudinal direction in the longitudinal direction is located substantially in the center of the bottom surface in each cross section and has the opening. An intake collector for an internal combustion engine, wherein the portion is located substantially at the center of the bottom surface in each cross section, and an outlet passage reaching the opening is formed so as to face the ridge.