CN1317503C - Internal combustion engine intake air passageway member - Google Patents

Abstract

It is an object of the present invention to provide an intake passage member that can be formed by die casting or injection molding of a synthetic resin which allows the removal of cores from the mold without destruction of the cores even in cases where there is a bent part in the intake passage. The present invention provides an intake passage member for an internal combustion engine comprising a throttle body (intake passage main body part) which has an intake passage that has a bent part, and an insulator which is interposed between the abovementioned intake passage main body part and the internal combustion engine, wherein the intake passage of the abovementioned insulator is extended in the direction in which the intake air flows through, a portion of the bent part of the abovementioned intake passage is formed in the intake passage of the insulator, and the intake passages of both the intake passage main body part and insulator are formed with shapes that allow cores to be removed from the mold. Since the cores can be removed from the mold without destroying the cores, the intake passage member can be manufactured by die casting or injection molding of a synthetic resin.

Description

Intake passage member for internal combustion engine

technical field

The present invention relates to an intake passage component, such as a throttle body, carburetor, intake manifold or the like, which feeds air or a mixture to an intake valve of an internal combustion engine.

Background technique

5 is a sectional view showing a conventional intake passage member attached to a cylinder head or the like of an engine 200 . Here, the term "intake passage member" refers to a member combining a carburetor, a throttle body or an intake pipe with a partition. Also, such a carburetor, throttle body, intake pipe or the like is referred to as an "intake passage body part".

The intake passage member 10 shown in FIG. 5 uses a throttle body 11 as the intake passage main body. Spacer 12 is used for thermal insulation and is typically made of phenolic plastic. The throttle body 11 has a curved suction passage 13 inside. The throttle body 11 is fastened to the engine 200 via the spacer 12 by means of bolts or the like (not shown in the drawings). The intake passage 13 communicates with an intake passage 20 formed on the side of the engine 200, and intermittently supplies intake air into the cylinder by opening and closing a valve 202 provided at the end of the intake passage 201.

It may be the case that there is a bent portion 15 in the intake passage 13, as shown. The reason for setting the curved portion is that due to the limitation of the location, when the intake passage member 10 is attached to the engine 200 , it may be necessary to incline the intake passage by an angle θ.

The throttle body 11 serving as the main body of the intake passage is usually made of aluminum alloy by die-casting. However, in recent years, synthetic resins have been used to make throttle bodies. In another case, a manufacturing method based on injection molding is used. In the case of injection molding, the intake channel 13 can be formed by inserting a core in the region of the intake channel 13 and removing the core from the mold after injection molding.

However, if a bend 15 is provided in the intake passage, there is an area S where the core cannot be removed from either end. In this case the throttle body 11 is usually produced by die casting. The reason for this is as follows: In the case of die casting, the core is made of sand; therefore, it can be removed from the curved portion 15 by breaking it.

However, if the throttle body 11 is manufactured by die casting, the manufacturing rate is significantly lowered; that is, die casting molds and cores must be manufactured one by one. This requires a considerable amount of labor, and causes a problem of increased manufacturing cost of the throttle body 11 .

Contents of the invention

The present invention is designed to solve these problems. An object of the present invention is to provide an intake passage member by dividing the part S from which a core cannot be taken out into two members, namely a throttle valve body 11 and A spacer 12, the intake passage member of the present invention can also be manufactured by die-casting or injection-molding of synthetic resin.

In order to achieve the above objects, the present invention is an intake passage member for an internal combustion engine, comprising: an intake air or a mixture fed into the internal combustion engine, and which is provided with an intake passage with a curved portion. a passage main part; and a spacer interposed between the above-mentioned intake passage main part and the internal combustion engine, wherein a part of the curved portion of the above-mentioned intake passage is formed in the intake passage of the spacer, and the intake passage main part and The air inlet passages of the spacer are all formed in a shape that allows a core to be taken out from the mold, wherein the shapes of the respective air inlet passages formed in the main body of the air inlet passage and the spacer are such that when the corresponding air inlet passages are formed When the respective cores are formed with a split structure, the cores can be removed from the mold from both ends of the inlet passages.

Alternatively, a structure may be adopted in which the above-mentioned intake passage main body member and the partition member are connected by engaging a protrusion formed on one of these members with a recess formed on the other member.

Description of drawings

1 is a sectional view showing an intake passage member of the present invention attached to an engine;

2 is an enlarged sectional view showing a main body of a throttle body;

Figure 3 shows a spacer; Figure 3(a) is a sectional view along line III-III in Figure 3(b); and Figure 3(b) is a bottom view;

Figure 4 shows another spacer; Figure 4(a) is a sectional view along line IV-IV of Figure 4(b), and Figure 4(b) is a bottom view; and

Fig. 5 is a sectional view showing a conventional intake passage member attached to an engine.

Detailed ways

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a sectional view showing an intake passage member 100 of the present invention attached to an engine 200 . The throttle body 110 serving as the main body of the intake passage is fastened to the engine 200 via a spacer 120 by means of bolts or the like (not shown in the drawings). An intake passage 111 is formed in the throttle body 110, and a throttle valve 115 is installed in the intake passage 111 so as to be freely pivotable.

In the present invention, the thickness of the partition 120 (ie, the length along the flow direction of the intake air) is greatly increased, and the intake passage 121 (of the partition 120 ) is curved. Furthermore, the curved intake passage 121 of the spacer 120 and the throttle body 110 form an integral unit, thereby forming an intake passage with a curved portion 117 similar to that shown in the conventional example. As a result, the intake passage 111 can be inclined at the same angle θ as that shown in the conventional example.

FIG. 2 is an enlarged cross-sectional view of the main body 113 of the throttle body 110 . In the case where the main body 113 is die-cast or injection-molded of synthetic resin, a core is used to form the intake passage 111 . However, as shown in FIG. 2 , the core shape is formed such that a portion S that cannot normally take out the core is divided into two halves between an upper side core 131 and a lower side core 132 . The upper core 131 has a stepped cylindrical shape formed with a three-step structure in which the diameter (of the core) gradually decreases in the downward direction, but the central axis is straight. Thus, the core can be pulled out of the mold in the direction shown for subsequent molding. The lower core 132 has a bent portion, but it can also be pulled out by pulling the core in the direction indicated by b.

FIG. 3 shows the spacer 120; FIG. 3(a) is a cross-sectional view along line III-III in FIG. 3(b); and FIG. 3(b) is a bottom view. The air intake channel 121 is also molded by a core when the spacer 120 is molded; however, in this core, as shown in FIG. An upper core 141 and a lower core 142 are divided into two halves. The upper core 141 has a curved surface, but the upper core can be taken out by pulling the core in the direction c shown in the figure, while the lower core 142 can be pulled out in the direction d .

In addition, when the throttle valve 115 is attached to the main body 113 of the throttle body 110 and the protruding portion of the spacer 120 is inserted into the recessed portion 116 formed in the lower end portion of the main body 113, it is possible to pass the throttle body The intake passage 111 of the spacer 110 and the intake passage 121 of the spacer 120 form an intake passage that is bent in the same manner as a conventional member. Furthermore, by engaging the convex portion 122 and the concave portion 116, there is no need to form a stepped portion at the joint between the intake passages.

As shown in Fig. 3 (b), the spacer 120 has a flange below the protruding portion 122, and through holes 123, 123 for bolts or the like are formed in the protruding portions on both sides of the flange. . The lower end of the throttle body 110 also has the same shape, and has a through hole (not shown in the figure). These through-holes and the through-holes 123, 123 are superimposed, and members such as bolts or the like pass through them; then by screwing these bolts into female threads formed on the engine side, fastening can be accomplished.

Fig. 4 shows another spacer; Fig. 4(a) is a sectional view along line IV-IV in Fig. 4(b), and Fig. 4(b) is a bottom view. The spacer 150 is shaped such that an air intake passage 152 is formed at the center of a thick disk 151, and a cylindrical portion 153 is provided around the periphery. The intake passage 152 is curved, and this curvature can be formed by dividing the core into an upper core 161 and a lower core 162, and pulling out the respective cores in opposite directions. Four slits 154 are formed in the cylindrical portion 153 . In addition, a pipe (not shown in the drawing) installed in a vertical position in the intake passage on the engine is inserted and connected to the inside of the cylindrical portion 153 . In addition, a portion of the thick disc 151 engages and connects with a recessed portion formed in the throttle body.

As described above, the intake passage member for an internal combustion engine provided by the present invention is an intake passage member for an internal combustion engine comprising: feeding intake air or a mixture into an internal combustion engine, and an intake passage main body having an intake passage with a curved portion; and a spacer interposed between the intake passage main body and the internal combustion engine, wherein a part of the curved portion of the intake passage forms the spacer In the inlet passage of the inlet passage, and the inlet passages of the main part of the inlet passage and the spacer are formed in a shape that allows a core to be taken out from the mold. Therefore, the intake passage member having the intake passage bent at a desired angle can be manufactured by die casting, synthetic resin injection molding or the like.

If the above-mentioned intake passage main body and the spacer are connected by engagement of a protrusion formed on one of these parts with a recess formed on the other part, it is not necessary A stepped portion is formed at the junction between the channels.

Claims (2)

1. An intake passage component for an internal combustion engine, comprising: an intake passage main body which feeds intake air or a mixture into an internal combustion engine, and which is provided with an intake passage with a bent portion; and a spacer which is inserted between said intake passage main body and the internal combustion engine between; Wherein, a part of the curved portion of the air inlet passage is formed in the air inlet passage of the spacer, and both the main body of the air inlet passage and the air inlet passage of the spacer are formed in a shape that allows a core to be taken out from the mold, which characterized in that, The respective intake passages formed in the intake passage main body and the spacer are shaped such that when the respective cores forming the respective intake passages are formed with a split structure, the intake passages can be drawn from both ends of the intake passages. The core is removed from the mold. 2. The intake passage member for an internal combustion engine according to claim 1, wherein the intake passage main body part and the partition part are formed by a protrusion formed on one of the intake passage main part and the partition part. The outgoing portion engages with a recessed portion formed on the other of these parts for connection.

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