JP2006291844A - Method of forming fuel distribution pipe - Google Patents

Abstract

A plurality of types of fuel distribution pipes having different pipe lengths can be formed by preparing a plurality of types of a part of a mold and selectively using them.
In a method for forming a fuel distribution pipe having a fuel passage (5) and a plurality of fuel injection valve mounting holes (3a), a mold (10) is joined so as to be separable from each other along the longitudinal direction of a cavity (14). As the second mold block, a plurality of 13 (A) and 13 (B) having different longitudinal dimensions of the cavity 14 are prepared as the second mold block, and the core is used as the second mold block. , 11 (A) and 11 (B) having different lengths corresponding to the plurality of second mold blocks are prepared, and a plurality of second mold blocks and cores are prepared in the first mold block 12. A plurality of types of fuel distribution pipes 1 (A), 1 (B) of different lengths are filled with synthetic resin in a plurality of types of cavities 14 (A), 14 (B) that are selectively combined. ).
[Selection] Figure 1

Description

  The present invention relates to a method for forming a fuel distribution pipe used in an engine fuel supply system, and in particular, a fuel introduction port, a fuel passage connected to the fuel introduction port, and a plurality of distribution passages branched from the fuel passage. And a fuel injection valve mounting hole connected to these distribution passages, and a fuel distribution pipe having a plurality of mounting bosses on the outside are formed in a cavity defined by a mold and a core disposed in the mold. The present invention relates to an improvement in the molding method of fuel distribution pipes that are filled with synthetic resin and molded.

Such a fuel distribution pipe forming method is already known as disclosed in, for example, Patent Document 1 below.
JP 2001-27162 A

  In the conventional method for forming fuel distribution pipes, a plurality of types of fuel distribution pipes having different lengths, intervals between fuel injection valve mounting holes, intervals between mounting bosses, etc. are formed in accordance with various engine specifications. In some cases, multiple types of special molds corresponding to these types of fuel distribution pipes were used. However, preparing a plurality of types of dedicated molds corresponding to the types of fuel distribution pipes in this way has a large economic burden and makes it difficult to reduce product costs.

  The present invention has been made in view of such circumstances, and by preparing a plurality of types of only a part of a mold and selectively using them, a plurality of types of fuel distribution pipes can be formed. Therefore, an object of the present invention is to provide a method for forming a fuel distribution pipe that can contribute to a reduction in product cost.

  In order to achieve the above object, the present invention includes a fuel introduction port, a fuel passage connected to the fuel introduction port, a plurality of distribution passages branched from the fuel passage, and a fuel injection valve connected to the distribution passages. A fuel distribution pipe having a hole and a plurality of mounting bosses on the outside is molded by filling a cavity defined by a mold and a core disposed inside the mold with a synthetic resin. In the pipe molding method, the mold is composed of a first mold block and a second mold block that are separably joined to each other along the longitudinal direction of the cavity. Plural pieces having different longitudinal dimensions are prepared, and plural cores having different lengths corresponding to the plural second mold blocks are prepared as cores, and plural second molds are provided in the first mold block. Mold block and core In combination 択的 by filling a synthetic resin to a plurality of types of cavities defining, the first characterized by molding a plurality of kinds of fuel distribution pipe having different lengths.

  The present invention also includes a fuel inlet, a fuel passage connected to the fuel inlet, a plurality of distribution passages branched from the fuel passage, and fuel injection valve mounting holes connected to the distribution passages. In a fuel distribution pipe molding method, a fuel distribution pipe having a plurality of mounting bosses is molded by filling a cavity defined by a mold and a core disposed therein with a synthetic resin. The mold is composed of a first mold block and a second mold block that are separably joined to each other at an intermediate portion of the cavity corresponding to an intermediate portion between fuel injection valve mounting holes or an intermediate portion between mounting bosses. As the second mold block, a plurality of fuel injection valve mounting holes or mounting bosses formed in the cavity of the first mold block are prepared in different positions, and a plurality of second mold blocks are provided in the first mold block. Mold Filling multiple types of cavities defined by selectively combining locks with synthetic resin to form multiple types of fuel distribution pipes with different distances between fuel injection valve mounting holes or mounting bosses This is a second feature.

  According to the first feature of the present invention, the first mold block is filled with a synthetic resin in a cavity defined by selectively combining a plurality of second mold blocks and cores, and the lengths are different. Therefore, the first mold block is commonly used for forming any of the multiple types of fuel distribution pipes having different lengths. Therefore, it can contribute to the reduction of the manufacturing cost of the mold and the reduction of the product cost.

  According to the second aspect of the present invention, the first mold block is filled with a synthetic resin in a cavity defined by selectively combining a plurality of second mold blocks, and the fuel injection valve mounting holes are formed. Multiple types of fuel distribution pipes with different distances between mounting bosses or distances between mounting bosses can be formed. Therefore, it is possible to contribute to the reduction of the production cost of the mold and the reduction of the product cost.

  Embodiments of the present invention will be described below on the basis of preferred embodiments of the present invention shown in the accompanying drawings.

  1 is a side view of a fuel distribution pipe formed by the method of the present invention, FIG. 2 is a view taken along the arrow 2 in FIG. 1, FIG. 3 is a view taken along the 3 arrow in FIG. 5 is a cross-sectional view taken along line 5-5 of FIG. 1, FIG. 6 is a vertical cross-sectional view of a mold used for forming the first type fuel distribution pipe, and FIG. 7 is a second type fuel distribution pipe. It is a longitudinal cross-sectional view of the metal mold | die used for.

  First, the structure of the fuel distribution pipe for an engine to be molded by the molding method of the present invention will be described with reference to FIGS.

  The fuel distribution pipe 1 protrudes from a straight pipe portion 2 and a side surface of the pipe portion 2, a pair of cylindrical portions 3 and 3 aligned in the longitudinal direction, and from a side surface of the pipe portion 2. A pair of mounting bosses 4 and 4 are arranged in the vicinity of the cylindrical portions 3 and 3, respectively.

  A fuel passage 5 and a pair of distribution passages 7, 7 branched from the fuel passage 5 toward the pair of cylindrical portions 3, 3 are formed in the pipe portion 2. The diameter is smaller than 5. One end portion of the fuel passage 5 is opened as a fuel introduction port 5 a on one end surface of the pipe portion 2, and the other end is closed by the end wall of the pipe portion 2.

  Each cylinder portion 3 is provided with a fuel injection valve mounting hole 3a having a diameter larger than that of the distribution passage 7. Each mounting boss 4 is provided with a mounting hole 4a parallel to the fuel injection valve mounting hole 3a.

  Thus, when the fuel distribution pipe 1 is used, as shown in FIG. 5, the fuel distribution pipe 1 is attached to an intake system E of an engine such as a throttle body by using a pair of mounting bosses 4 and 4, A fuel supply pipe is connected to the fuel introduction port 5a, and a fuel injection valve I is inserted into the fuel injection valve mounting hole 3a.

  In this embodiment, as the fuel distribution pipe 1 having such a structure, the length of the pipe portion 2 is different from L1> L2, and the interval between the fuel injection valve mounting holes 3a is different from M1> M2, Two types 1 (A) and 1 (B), which are different from each other in the interval of N1> N2, are required, and these two types of fuel distribution pipes 1 (A) and 1 (B) are formed. The method will be described with reference to FIGS.

  The fuel distribution pipe 1 is formed by injecting and filling synthetic resin from a gate 15 into a cavity 14 defined by a mold 10 and a core 11 disposed in the mold 10. The mold 10 is divided into a first mold block 12 and a second mold block 13 at the middle part in the longitudinal direction of the cavity 14, and both the mold blocks 12 and 13 are connected by a plurality of connecting bolts 9 and 9. It is joined in a separable manner.

  The first mold block 12 is divided into a fixed mold 12 a and a movable mold 12 b that can be opened and closed in a direction orthogonal to the longitudinal direction of the cavity 14, and is defined by the first mold block 12 and the core 11. One half of the cavity 14 forms one half of the fuel distribution pipe 1 including the fuel inlet 5 a, the fuel injection valve mounting hole 3 a close thereto, and the mounting boss 4.

  The second mold block 13 is also divided so as to be openable and closable into a fixed mold 13a and a movable mold 13b in a direction orthogonal to the longitudinal direction of the cavity 14, and an opening is formed in the cavity 14 on the mating surface of the fixed mold 13a and the movable mold 13b. A gate 15 is provided. The fuel distribution pipe 1 including the fuel injection valve mounting hole 3a and the mounting boss 4 close to the closed end of the fuel distribution pipe 1 is formed by the other half of the cavity 14 defined by the second mold block 13 and the core 11. The other half is molded.

  The second mold block 13 is provided with two types 13 (A) and 13 (B) in which the length of the corresponding cavity 14 is different from P1> P2, and the core 11 has a cavity Two types 11 (A) and 11 (B) are prepared in which the effective length of the portion inserted into 14 is different from Q1> Q2.

  In each of the first and second mold blocks 12, 13, the cavity 14 is formed so as to mold the fuel injection valve mounting hole 3a and the mounting boss 4 of the fuel distribution pipe 1 on the movable molds 12b, 13b side. .

  Thus, as shown in FIG. 6, when the first mold block 12 is combined with the first type second mold block 13 (A) and the first type core 11 (A), the first mold block 12 is combined with the first mold block 12. A first type of cavity 14 (A) corresponding to one type of fuel distribution pipe 1 (A) is defined, and as shown in FIG. 7, the first type of mold block 12 includes a second type of mold block 1313. When (B) and the second type core 11 (B) are combined, a second type cavity 14 (B) corresponding to the second type fuel distribution pipe 1 (B) is defined. ing.

  The operation of this embodiment will be described.

  First, the case where the first type A fuel distribution pipe 1 (A) is molded will be described with reference to FIG.

  The fixed molds 12a and 17 and the movable molds 12b and 13b of the first mold block 12 and the first type second mold block 13 (A) are joined together by connecting bolts 16, respectively. The fixed molds 12a and 13a and the movable molds 12b and 13b are closed, and the first type core 11 (A) is inserted between the fixed molds 12a and 13a and the movable molds 12b and 13b from the first mold block 12 side. Then, a cavity corresponding to the first type fuel distribution pipe 1 (A) is provided between the first mold block 12, the first type second mold block 13 (A), and the first type core 11 (A). 14 (A) is defined. Therefore, if the synthetic resin is injected and filled from the gate 15 of the second mold block 13 (A) into the cavity 14 (A), the first type fuel distribution pipe 1 (A) can be formed.

  Next, if the space between the fixed molds 12a and 13a and the movable molds 12b and 13b is opened, the first type fuel distribution pipe 1 (A) can be moved by the contracting action of the fuel injection valve mounting hole 3a and the inner peripheral wall of the mounting boss 4. Since the molds 12b and 13b are detached from the fixed molds 12a and 13a, the fuel distribution pipe 1 (A) can be grasped and released from the movable molds 12b and 13b.

  Next, the case where the second type fuel distribution pipe 1 (B) is molded will be described with reference to FIG.

  The fixed molds 12a and 13a and the movable molds 12b and 13b of the first mold block 12 and the second type second mold block 13 (B) are joined together by connecting bolts 16, respectively. Then, the fixed molds 12a and 13a and the movable molds 12b and 13b are closed, and the second type core 11 (B) is inserted between the fixed molds 12a and 13a and the movable molds 12b and 13b from the first mold block 12 side. Then, a cavity corresponding to the second type fuel distribution pipe 1 (B) between the first mold block 12, the second type second mold block 13 (B), and the second type core 11 (B). 14 (B) is defined. Therefore, if the synthetic resin is injected and filled from the gate 15 of the second mold block 13 (B) into the cavity 14 (B), the second type fuel distribution pipe 1 (B) can be formed. Next, if the space between the fixed molds 12a, 13a and the movable molds 12b, 13b is opened, the fuel distribution pipe 1 can be taken out between the fixed molds 12a, 13a and the movable molds 12b, 13b as in the previous case.

  As described above, when molding the two types of fuel distribution pipes 1 (A) and 1 (B), the first mold block 12 is provided with two types of second mold blocks 12 (A) and 12 (B). If one side and one of the two types of cores 11 (A) and 11 (B) are selectively joined, the cavity 14 (A) corresponding to the desired type of fuel distribution pipes 1 (A) and 1 (B) is obtained. ) And 14 (B), respectively, can be configured, so that at least the first mold block 12 is used in common. This can contribute to reduction of the product cost.

  As mentioned above, although the Example of this invention was described, this invention is not limited to it, A various design change is possible in the range which does not deviate from the summary. For example, assuming that the pipe length L1 = L2, a plurality of fuel distribution pipes 1 (A) having different distances M1, M2 between the fuel injection valve mounting holes 3a, 3a or distances N1, N2 between the mounting bosses 4, 4 are different. When molding 1 (B), prepare a plurality of types of second mold blocks 13 (A) and 13 (B) with different positions of the fuel injection valve mounting hole 3a or mounting boss 4 to be molded. In this case, the first mold block 12 and the core 11 are commonly used. Therefore, it is possible to contribute to the reduction of the manufacturing cost of the mold 10 and the reduction of the product cost.

The side view of the fuel distribution pipe shape | molded with the method of this invention. FIG. 2 is a view taken in the direction of arrow 2 in FIG. 1. FIG. 3 is a view taken in the direction of arrow 3 in FIG. 1. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 in FIG. The longitudinal cross-sectional view of the metal mold | die used for shaping | molding of 1st type fuel distribution piping. The longitudinal cross-sectional view of the metal mold | die used for shaping | molding of a 2nd type fuel distribution piping.

Explanation of symbols

1 (A) ··· First type fuel distribution pipe 1 (B) · · Second type fuel distribution pipe 3a ··· Fuel injection valve mounting hole 4 ··· Mounting boss 5 ··· Fuel passage 5a ... Fuel inlet 7 ... Distribution channel 10 ... Mold 11 (A) ... First type core 11 (B) ... Second type Child 12 ··· First mold block 13 (A) ... First type second mold block 13 (B) ... Second type second mold block 14 (A) ... First type cavity 14 (B) ... Second type cavity

Claims (2)

A fuel introduction port (5a), a fuel passage (5) connected to the fuel introduction port (5a), a plurality of distribution passages (7, 7) branched from the fuel passage (5), and these distribution passages ( 7 and 7), and a fuel distribution pipe (1) having a plurality of mounting bosses (4, 4) on the outside, a mold (10), and a fuel injection valve mounting hole (3a, 3a) In a fuel distribution pipe molding method in which a cavity (14) defined by an inner core (11) is filled with a synthetic resin and molded,
The mold (10) includes a first mold block (12) and a second mold block (13) that are separably joined along the longitudinal direction of the cavity (14), and the second mold block. A plurality (13 (A), 13 (B)) having different longitudinal dimensions of the cavity (14) is prepared as the mold block (13), and a plurality of second mold blocks are used as the core (11). A plurality of different lengths corresponding to (13) are prepared, and a plurality of second mold blocks (13) and cores (11) are selectively combined with the first mold block (12). Plural kinds of fuel distribution pipes (1 (A), 1 (B)) having different lengths are filled by filling synthetic resin into the defined plural kinds of cavities (14 (A), 14 (B)). A method of forming a fuel distribution pipe, characterized by forming. A fuel introduction port (5a), a fuel passage (5) connected to the fuel introduction port (5a), a plurality of distribution passages (7, 7) branched from the fuel passage (5), and these distribution passages ( 7 and 7), and a fuel distribution pipe (1) having a plurality of mounting bosses (4, 4) on the outside, a mold (10), and a fuel injection valve mounting hole (3a, 3a) In a fuel distribution pipe molding method in which a cavity (14) defined by an inner core (11) is filled with a synthetic resin and molded,
The mold (10) is joined to be separable from each other at the middle part of the cavity (14) corresponding to the middle part of the fuel injection valve mounting holes (3a, 3a) or the middle part of the mounting bosses (4, 4). The first mold block (12) and the second mold block (13) to be formed, and the second mold block (13) as a fuel injection valve mounting hole (3a, 3a) to be molded or attached Prepare a plurality of bosses (4, 4) with different positions (13 (A), 13 (B)) and select a plurality of second mold blocks (13) as the first mold block (12) A plurality of types of cavities (14 (A), 14 (B)) defined in combination are filled with synthetic resin, and the distance between the fuel injection valve mounting holes (3a, 3a) or the mounting boss (4, 4) 4) Plural types of fuel distribution pipes (1 (A , 1 (B)), characterized in that forming a molding method of the fuel distribution pipe.

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