JP2012077644A - Method and apparatus for manufacturing fuel distribution pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and an apparatus for manufacturing a fuel distribution pipe which employs an inexpensive and high performance member for reducing pulsation, and furthermore enables resin-made members constituting a fuel distribution pipe to be highly surely joined together, thereby obtaining high reliability over a long period of time.SOLUTION: Upper and lower half-split members 20, 21 constituting a body part 2 are formed of resin materials, and a pulsation-reducing member 3 is formed of a resin in a plate shape. When obtaining the body part 2 by mating open sides of the upper and lower members 20, 21 with each other, the pulsation-reducing member 3 is arranged so as to be located inside the body part 2. The resin material in a molten state is fed to joining parts of the upper and lower members 20, 21 of the body part 2, and the open sides of the upper and lower members 20, 21 are melted and joined with each other with the resin material.

Description

  The present invention relates to a fuel distribution pipe manufacturing method and a manufacturing apparatus for distributing and supplying fuel to each cylinder of a multi-cylinder internal combustion engine.

  Conventionally, a multi-cylinder internal combustion engine is mounted on a vehicle such as an automobile. An internal combustion engine is provided with an injector for injecting fuel into each cylinder. The fuel pumped from the fuel pump is temporarily stored in a fuel distribution pipe called a delivery pipe before being supplied to the injector. Then, it distributes to each injector from fuel distribution piping (for example, refer to patent documents 1 and 2).

  Since fuel injection is intermittently performed at a predetermined timing in the injector, pulsation occurs due to fuel pressure fluctuations inside the fuel distribution pipe, and this pulsation can cause unstable fuel supply or abnormal noise. It may cause the occurrence.

  In the fuel distribution pipe of Patent Document 1, a hollow damper member composed of two metal plates and a mass body is provided inside the distribution pipe, and the pulsation of the fuel is suppressed by deformation of the damper member. The fuel distribution pipe includes a pipe-shaped main body portion made of a resin material and a cap that closes an end opening of the main body portion, and the main body portion and the cap are welded together.

  Moreover, in the fuel distribution pipe of Patent Document 2, an inner pipe is provided inside the pipe-shaped main body, and fuel pulsation is suppressed by deformation of the inner pipe. In this fuel distribution pipe, the main body and the inner pipe are integrally formed of a resin material, and the end opening of the main body is closed with another cap. This also welds the main body and the cap.

JP 2010-180727 A JP 2010-116849 A

  However, when the damper member is made of a metal plate and a mass body as in Patent Document 1, the number of parts is large and the cost is increased.

  In addition, the number of parts can be reduced if the inner tube is integrally formed with the main body as in Patent Document 2, but in this case, since the double tube structure must be formed integrally, the degree of freedom in setting the shape at the time of forming is increased. It may become low and a sufficient pulsation reduction effect may not be obtained.

  Moreover, in patent document 1, 2, after shape | molding a main-body part in pipe shape, it is trying to block | close an edge part opening with another cap. The pressure from the fuel pump is applied to the inside of the fuel distribution pipe. In addition, the pulsation described above is generated, and the excitation force due to the vibration of the internal combustion engine or the vehicle is also applied. Under such circumstances, it is difficult to reliably ensure the sealing performance between the main body portion of the fuel distribution pipe and the cap over a long period of time.

  The present invention has been made in view of the above points, and the object of the present invention is to make a resin distribution pipe that constitutes a fuel distribution pipe while making an inexpensive and high-performance member for reducing pulsation. It is to be able to obtain high reliability over a long period of time by reliably joining the members.

  In order to achieve the above object, in the present invention, the pulsation reducing member is a separate member from the main body, is made into a low-cost plate shape, and is further supplied separately with resin members constituting the fuel distribution pipe. Bonding was performed using the bonding resin material in the state.

  1st invention has a fuel inflow hole connected to a fuel pump, and a plurality of fuel discharge holes connected to a plurality of injectors, respectively, after temporarily storing fuel flowing in from the fuel inflow hole, A fuel distribution pipe provided with a hollow main body for distributing to each fuel discharge hole, and a pulsation reducing member provided inside the main body for reducing pulsation of fuel generated inside the main body In the manufacturing method for manufacturing the first and second members that form the half-shaped first and second members constituting the main body portion with a resin material, the first step of forming the pulsation reducing member into a plate shape with the resin material, and When obtaining the main body by combining the open sides of the first and second members formed in the first step, the pulsation reducing member formed in the first step is disposed so as to be located inside the main body. Second step to be performed and the book obtained in the second step. A third step of separately supplying a molten joining resin material to the joining portion of the first and second members of the portion, and welding and joining the open sides of the first and second members with the resin material. It is characterized by

  According to this configuration, since the main body for temporarily storing the fuel and the pulsation reducing member are separate members, the degree of freedom in setting the shape at the time of molding is increased. Thereby, the performance of the pulsation reducing member is enhanced and a sufficient pulsation reduction effect is obtained. Further, since the pulsation reducing member has a plate shape that can be easily molded, it is possible to reduce the cost.

  And at the time of manufacture, by supplying the joining resin material in the molten state to the joining portions of the first and second members, the joining resin material flows and easily reaches the joining portions of the first and second members. . By solidifying the bonding resin material, the entire bonding portion of the first and second members is reliably bonded.

  According to a second invention, in the first invention, in the third step, the pulsation reducing member is welded to the first and second members by a bonding resin material.

  According to this configuration, since the pulsation reducing member is simultaneously welded to the first and second members by the bonding resin material in the third step, a step only for welding the pulsation reducing member is not necessary.

  According to a third invention, in the first or second invention, in the first step, the first and second molds are fixed using a fixed mold and a movable mold that slides in a direction crossing the mold opening and mold closing directions with respect to the fixed mold. The second member is molded, and in the second step, the first member is held on one of the fixed mold and the movable mold in the mold open state, and the second member is held on the other, and then the mold is opened. The movable mold in the state is slid until the first member and the second member face each other to make the mold closed again, and the open side of the first and second members is combined to obtain the main body, and the first A cavity for supplying the bonding resin material is formed around the bonding portion of the first and second members, and in the third step, the bonding resin material is supplied to the cavity.

  According to this configuration, the cavity for supplying the bonding resin material is formed around the bonded portion of the first and second members by the fixed mold and the movable mold that mold the first and second members. Accordingly, the first and second members can be joined with the joining resin material while being held in the fixed mold and the movable mold without being transferred to different molds.

  A fourth invention has a fuel inflow hole connected to a fuel pump and a plurality of fuel discharge holes connected to an injector, and once the fuel flowing in from the fuel inflow hole is temporarily stored, each of the fuel discharge holes A fuel distribution pipe having a hollow main body portion for distributing to holes and a pulsation reducing member provided inside the main body portion for reducing pulsation of fuel generated inside the main body portion is manufactured. In the manufacturing apparatus, the half-shaped first and second members constituting the main body portion are molded, a mold for molding the pulsation reducing member into a plate shape, and a molten state in the mold A resin supply device for supplying a resin material, and the mold is configured to form a cavity for supplying a resin material for bonding to a bonding portion of the first and second members, and the cavity By the above resin supply device It is characterized in that the bonding resin material melting state is arranged to be supplied.

  According to this configuration, as in the first aspect of the invention, the degree of freedom in setting the shape of each of the main body portion and the pulsation reducing member is increased, so that the performance of the pulsation reducing member is enhanced and a sufficient pulsation reducing effect is obtained. can get. Moreover, since the pulsation reducing member has a plate shape, it is possible to reduce the cost.

  And at the time of manufacture, by supplying the molten resin material to the joint portion of the first and second members, the resin material flows and easily reaches the joint portion of the first and second members. By solidifying the resin material, the entire joining portion of the first and second members is reliably joined.

  According to the first and fourth aspects of the invention, the halved first and second members constituting the main body portion are molded with a resin material, and the pulsation reducing member is molded into a plate shape with a resin material, thereby reducing pulsation. The cost can be reduced while obtaining a high pulsation reduction effect by the member. And when combining the open side of the 1st and 2nd member and obtaining a main-body part, a pulsation reduction member is arrange | positioned inside, and the resin material for joining in a molten state is put in the joining part of a 1st and 2nd member after that. By supplying and joining, the resin material for joining can be spread over the whole joining part, and the whole joining part can be joined reliably. Thereby, high reliability can be obtained over a long period of time.

  According to the second invention, since the pulsation reducing member is welded to the first and second members by the bonding resin material, the number of steps can be reduced and the cost of the product can be further increased.

  According to the third invention, after the first and second members are molded using the fixed mold and the movable mold, the mold is opened, and the movable mold is slid again until the first member and the second member face each other. The mold is closed, a cavity for supplying the molten resin material is formed around the joint portion of the first and second members, and the molten resin material is supplied to the cavity. Thereby, since it can join to the resin material for joining, without moving a 1st and 2nd member to another shaping | molding die, a manufacturing man-hour can be reduced.

It is a perspective view of fuel distribution piping. It is the II-II sectional view taken on the line of FIG. It is the III-III sectional view taken on the line of FIG. It is sectional drawing of the shaping | molding apparatus in a mold open state. It is a perspective view of the shaping | molding apparatus in a mold open state. It is a fragmentary sectional view of the shaping | molding apparatus in a mold open state. FIG. 5 is a view corresponding to FIG. 4 in a mold closed state. FIG. 5 is a view corresponding to FIG. 4 in a state where a resin material is filled. FIG. 7 is a view corresponding to FIG. 6 in a state where the mold is opened after forming each member. FIG. 7 is a view corresponding to FIG. 6 with the pulsation reducing member removed. FIG. 7 is a view corresponding to FIG. 6 in a state where the first movable mold is slid to the lowered end position. FIG. 7 is a view corresponding to FIG. 6 in a state where the first movable mold is slid to the lowered end position and clamped. It is an enlarged view of the state which formed the cavity for supplying the resin material for joining. FIG. 14 is a view corresponding to FIG. 13 in a state where a bonding resin material is supplied to the cavity. FIG. 6 is a view corresponding to FIG. 5 in a state in which the production of the fuel distribution pipe is completed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 is a fuel distribution pipe 1 manufactured by a manufacturing method according to an embodiment of the present invention. In the description of this embodiment, the structure of the fuel distribution pipe 1 will be described first. The fuel distribution pipe 1 constitutes a part of a fuel supply device of a multi-cylinder internal combustion engine (not shown) mounted on an automobile, and includes a fuel pump (not shown) and an injector (not shown). Between the fuel lines. In this embodiment, the internal combustion engine has three cylinders.

  As shown in FIGS. 2 and 3, the fuel distribution pipe 1 includes a hollow main body 2 for temporarily storing fuel, and a fuel that is provided inside the main body 2 and is generated inside the main body 2. And a pulsation reducing member 3 for reducing the pulsation.

  The main body 2 has a substantially rectangular shape. The main body 2 has a fuel inflow pipe 10 connected to the discharge port of the fuel pump, and three fuel discharge pipes 12, 12, 12 connected to the three injectors of the internal combustion engine. . The fuel inflow pipe portion 10 is provided on one side in the longitudinal direction of the bottom wall portion 2a of the main body portion 2 and protrudes straight downward. A fuel inflow hole 10 a (see FIG. 2) communicating with the inside of the main body 2 is formed in the fuel inflow pipe portion 10. The fuel discharge pipe portion 12 is provided on the upper wall portion 2b of the main body portion 2 with an interval in the longitudinal direction, and protrudes upward. A fuel discharge hole 12 a that communicates with the inside of the main body 2 is formed inside the fuel discharge pipe 12.

  The main body 2 is configured by combining an upper member (first member) 20 and a lower member (second member) 21 that are divided in the vertical direction. The upper member 20 has a halved shape that opens downward, and is a resin member in which the upper wall portion 2b of the main body portion 2, the upper half of the peripheral wall portion, and the fuel discharge pipe portion 12 are integrally molded. It is. On the open side (lower side) of the upper member 20, an upper flange 20a is provided. The upper flange 20 a is positioned above the open end (lower end) of the upper member 20. An upper ridge 20b that protrudes downward and extends in the circumferential direction is formed at the edge of the upper flange 20a.

  On the other hand, the lower member 21 has a halved shape that opens upward, and the bottom wall portion 2a of the main body portion 2, the lower half of the peripheral wall portion, and the fuel inflow pipe portion 10 are integrally formed. It is a resin member. A lower flange 21 a is provided on the open side (upper side) of the lower member 21. The lower flange 21 a is positioned below the open end (upper end) of the lower member 21. Therefore, when the open sides of the upper member 20 and the lower member 21 are matched, a gap is formed between the upper flange 20a and the lower flange 21a. In addition, a lower protrusion 21b that protrudes upward and extends in the circumferential direction is formed at the edge of the lower flange 21a. The lower end of the lower ridge portion 21b and the upper end of the upper ridge portion 20b coincide with each other, and come into contact when the open sides of the upper member 20 and the lower member 21 are combined.

  Moreover, the circumferential direction part of the upper side protrusion part 20b and the lower side protrusion part 21b is notched, and the resin material 100 for joining mentioned later is supplied to this notch part.

  The pulsation reducing member 3 is formed by molding a resin material into a plate shape. The plate thickness of the pulsation reducing member 3 is set to be thinner than the thickness of the main body 2.

  The pulsation reducing member 3 is disposed between the upper member 20 and the lower member 21 and extends in the longitudinal direction of the main body 2 as shown in FIG. By this pulsation reducing member 3, the internal space of the main body 2 is partitioned into an upper space R1 and a lower space R2.

  On the outer peripheral side of the pulsation reducing member 3, a clamping portion 3 a that is clamped between the lower end portion of the upper member 20 and the upper end portion of the lower member 21 is provided. On the outer peripheral side of the clamping portion 3a of the pulsation reducing member 3, an upper convex portion 3b that protrudes upward and extends along the outer peripheral portion of the pulsation reducing member 3, and a lower side that protrudes downward and extends in the same manner as the upper convex portion 3b. Convex part 3c is formed.

  The upper convex portion 3 b and the lower convex portion 3 c are accommodated in a gap between the upper flange 20 a of the upper member 20 and the lower flange 21 a of the lower member 21. In this state, the upper convex portion 3 b and the lower convex portion 3 c are engaged with the lower end portion of the upper member 20 and the upper end portion of the lower member 21 from the outside, and the pulsation reducing member 3 is in contact with the main body portion 2. Positioned. Further, a gap between the upper flange 20a of the upper member 20 and the lower flange 21a of the lower member 21 is filled with a bonding resin material 100 for bonding the upper member 20 and the lower member 21. Yes.

  A corrugated plate portion 3 d is formed on the inner peripheral side of the pulsation reducing member 3. The corrugated plate portion 3 d is formed so as to have a corrugated cross section in which peaks and valleys are continuously repeated in the width direction of the pulsation reducing member 3. The pulsation reducing member 3 is easily elastically deformed by the formation of the corrugated plate portion 3d. As will be described later, the pulsation of the fuel is suppressed by the elastic deformation of the pulsation reducing member 3.

  The upper flange 20 a of the upper member 20 of the main body 2 and the lower flange 21 a of the lower member 21 are welded together by a bonding resin material 100. Specifically, the molten bonding resin material 100 is supplied to the gap between the upper flange 20a and the lower flange 21a, and the lower surface of the upper flange 20a and the lower flange 21a are heated by the heat of the bonding resin material 100. Melt the top surface of. Then, since the supplied bonding resin material 100 is solidified, the bonding resin material 100 is integrated with the upper flange 20a and the lower flange 21a. At this time, since the bonding resin material 100 also melts the upper ridge portion 20b of the upper member 20 and the lower ridge portion 21b of the lower member 21, they are also integrated with the ridge portions 20b and 21b. Therefore, the mating portion between the upper member 20 and the lower member 21 is securely sealed and is firmly joined.

  Furthermore, since the bonding resin material 100 in the melted state also melts the upper convex portion 3b and the lower convex portion 3c of the pulsation reducing member 3, these convex portions 3b and 3c are also integrated. As a result, the pulsation reducing member 3 is welded to the upper member 20 and the lower member 21.

  As shown in FIG. 2, the longitudinal dimension of the pulsation reducing member 3 is set shorter than the longitudinal dimension of the main body 2. Therefore, a gap S is formed between the inner surface on the other side in the longitudinal direction of the main body 2 (right side in FIG. 2) and the other end in the longitudinal direction of the pulsation reducing member 3 (right side in FIG. 2). Become. The upper space R1 and the lower space R2 communicate with each other through the gap S.

  Next, the case where the fuel distribution pipe 1 is used will be described. The fuel pumped from the fuel pump flows from the fuel inflow pipe portion 10 to one side in the longitudinal direction of the lower space R2 of the main body portion 2 (left side in FIG. 2). The fuel that has flowed into the lower space R2 flows through the lower space R2 to the other side in the longitudinal direction, and flows into the upper space R1 through the gap S on the other side. The fuel that has flowed into the upper space R1 flows into the fuel discharge pipes 12, 12, and 12 while flowing toward one side in the longitudinal direction, and is supplied to the injectors. As the injector opens and closes intermittently, pulsation occurs in the fuel inside the fuel distribution pipe 1. At this time, since the pulsation reducing member 3 has a shape that is easily elastically deformed, the pulsation reducing member 3 is easily elastically deformed by the pulsation of the fuel, and the volume of the upper space R1 and the lower space R2 is changed, thereby absorbing the pulsation. Is suppressed.

  Next, based on FIGS. 4-6, the structure of the manufacturing apparatus 30 which manufactures the said fuel distribution pipe 1 is demonstrated.

  This manufacturing apparatus 30 employs a so-called die slide injection molding method. After the upper member 20, the lower member 21 and the pulsation reducing member 3 of the fuel distribution pipe 1 are formed at once with the same device, the upper member 20 and The lower member 21 is combined to obtain the main body 2, and the pulsation reducing member 3 is disposed so as to be located inside the main body 2, and then the molten bonding resin material 100 is supplied in the same apparatus. The upper member 20, the lower member 21, and the pulsation reducing member 3 are configured to be integrated at a time.

  Specifically, the manufacturing apparatus 30 includes a molding device 31 for molding the upper member 20, the lower member 21, and the pulsation reducing member 3, a mold driving device 32, and a resin supply device 33.

  The molding apparatus 31 includes a fixed platen 36, a movable platen 37, a fixed die 38 attached to the fixed platen 36, and a first movable die 39 and a second movable die 40 attached to the movable platen 37.

  A resin passage 36 a connected to the resin supply device 33 is formed in the fixed plate 36. The resin passage 36a is branched into a lower passage 36b, a central passage 36c, and an upper passage 36e. The lower passage 36b is a passage through which a resin material for molding the upper member 20 flows. The central passage 36c is a passage through which a resin material for molding the lower member 21 flows. The upper passage 36e is a passage through which a resin material for molding the pulsation reducing member 3 flows.

  On the lower side of the fixed die 38, an upper member molding surface 38a for molding the outer surface of the upper member 20 is formed in a concave shape. The upper member 20 is held in a state of being accommodated in the upper member molding surface 38a after molding. A lower member molding surface 38 b for molding the inner surface of the lower member 21 is formed in a convex shape at the center in the vertical direction of the fixed die 38. On the upper side of the fixed mold 38, a pulsation reducing member molding surface 38c for molding the upper surface of the pulsation reducing member 3 is formed.

  Further, a lower passage 38 d that communicates with the lower passage 36 b of the stationary platen 36 is formed below the fixed mold 38. The downstream end of the lower passage 38d is a gate that opens to the upper member molding surface 38a.

  A central passage 38 e that communicates with the central passage 36 c of the stationary platen 36 is formed at the center in the vertical direction of the stationary mold 38. The downstream end of the central passage 38e is a gate that opens to the lower member molding surface 38b.

  An upper passage 38 f communicating with the upper passage 36 e of the fixed plate 36 is formed on the upper side of the fixed mold 38. The downstream end of the upper passage 38f is a gate that opens to the pulsation reducing member molding surface 38c.

  Although not shown, the fixed mold 38 has a resin passage communicating with a gap (cavity B shown in FIG. 13) formed between the upper flange 20a of the upper member 20 and the lower flange 21a of the lower member 21. Is formed.

  The movable platen 37 is movable in a direction in which it is in contact with or away from the fixed platen 36. A mold driving device 32 is connected to the movable platen 37. The movable platen 37 is driven in a direction (horizontal direction) in contact with and away from the fixed platen 36 by the mold driving device 32, and the fixed die 38, the first movable die 39 and the second movable die 40 are closed (see FIG. 7). And a mold open state (shown in FIG. 4).

  On the lower side of the first movable mold 39, an upper member molding surface 39a for molding the inner surface of the upper member 20 is formed in a convex shape. On the upper side of the first movable die 39, a lower member molding surface 39b for molding the outer surface of the lower member 21 is formed in a concave shape. The lower member 21 is held in a state of being accommodated in the lower member molding surface 39b.

  The first movable mold 39 is attached to the movable platen 37 so as to be slidable in a direction crossing the mold opening and mold closing directions. Specifically, the first movable mold 39 slides in the vertical direction (vertical direction). A mold driving device 32 is connected to the first movable mold 39. The first movable mold 39 is driven in the vertical direction by the mold driving device 32.

  As shown in FIG. 4, when the first movable mold 39 is in the ascending end position, the upper member molding surface 39 a faces the upper member molding surface 38 a of the fixed mold 38 and the lower member molding surface 39 b. Is opposed to the molding surface 38b for the lower member of the fixed mold 38. At this time, the first movable mold 39 contacts the second movable mold 40.

  As shown in FIG. 11, when the first movable mold 39 is in the lowered end position, the lower member molding surface 39 b faces the upper member molding surface 38 a of the fixed mold 38.

  The second movable mold 40 is disposed at a position facing the pulsation reducing member molding surface 38 c of the fixed mold 38, and has a pulsation reducing member molding surface 40 a that molds the lower surface of the pulsation reducing member 3.

  As shown in FIG. 7, when the fixed mold 38, the first movable mold 39, and the second movable mold 40 are clamped with the first movable mold 39 in the raised end position, the upper member 20 is molded. A cavity for forming the cavity, the lower member 21 and a cavity for forming the pulsation reducing member 3 are formed.

  The mold driving device 32 is a well-known device having a fluid pressure cylinder, an electric actuator, or the like as a power source, and can move the movable platen 37 and slide the first movable die 39 separately. It has become.

  The resin supply device 33 is a well-known injection molding machine configured to heat and melt a resin material while kneading and to inject it into a cavity with a predetermined pressure. Resin material is supplied to the cavity for molding the upper member 20, the cavity for molding the lower member 21, and the cavity for molding the pulsation reducing member 3, and the upper flange 20a and the lower side of the upper member 20 Supplying the resin material to the cavity B formed between the lower flange 21a of the member 21 can be performed separately.

  Next, the point which manufactures the fuel distribution pipe 1 using the manufacturing apparatus 30 comprised as mentioned above is demonstrated.

  First, as shown in FIGS. 4 to 6, the first movable die 39 is raised by the die driving device 32 to the raised end position. Thus, the upper member molding surface 39a of the first movable mold 39 is opposed to the upper member molding surface 38a of the fixed mold 38, and the lower member molding surface 39b of the first movable mold 39 is below the fixed mold 38. Opposite to the side member molding surface 38b.

  After the first movable mold 39 is set to the ascending end position, the movable plate 37 is moved in the direction approaching the fixed plate 36 by the mold driving device 32, and the fixed mold 38 and the first movable mold 39 are moved as shown in FIG. And the second movable mold 40 is clamped. Thereby, a cavity for molding the upper member 20, a cavity for molding the lower member 21, and a cavity for molding the pulsation reducing member 3 are formed.

  After the fixed mold 38, the first movable mold 39 and the second movable mold 40 are clamped, the resin supply device 33 supplies the molten resin material to the resin passage 36 a of the fixed platen 36. As shown in FIG. 8, the resin material is divided into the lower passage 36b, the central passage 36c, and the upper passage 36e, and flows through the lower passage 38d, the central passage 38e, and the upper passage 38f of the fixed mold 38 to fill each cavity. Is done.

  After the resin material is cooled and solidified, the movable plate 37 is moved away from the fixed plate 36 by the mold driving device 32, and as shown in FIG. 9, the fixed die 38, the first movable die 39 and the second movable die are moved. The mold 40 is opened.

  Thereafter, as shown in FIG. 10, the resin materials A and A solidified in the resin passages 36a, 36b, 36c, 36e, 38d, 38e, and 38f are removed, and the pulsation reducing member 3 is, for example, a robot (not shown) or the like. To remove from the fixed mold 38 and the first movable mold 39 (demold). At this time, the pulsation reducing member 3 is pushed in the demolding direction by an unillustrated push pin.

  Further, the upper member 20 is held on the upper member molding surface 38 a of the fixed mold 38, and the lower member 21 is held on the lower member molding surface 39 b of the first movable mold 39.

  Next, as shown in FIG. 11, the first movable die 39 is lowered by the die driving device 32 to the lowered end position. Thereby, the open side of the upper member 20 and the lower member 21 faces each other. Further, the pulsation reducing member 3 is disposed between the upper member 20 and the lower member 21 by a robot and is held on one of the upper member 20 and the lower member 21. That is, the upper convex portion 3 b of the pulsation reducing member 3 is hooked on the open end portion of the upper member 20, or the lower convex portion 3 c is hooked on the open end portion of the lower member 21.

  Thereafter, the movable platen 37 is moved toward the fixed platen 36 by the mold driving device 32, and the fixed die 38 and the first movable die 39 are clamped again as shown in FIG. In this state, as shown in FIG. 13, the open side of the upper member 20 and the lower member 21 are combined, and the clamping portion 3 a of the pulsation reducing member 3 is clamped between the upper member 20 and the lower member 21. Further, a bonding resin material 100 for welding the upper member 20 and the lower member 21 between the upper flange 20a of the upper member 20 and the lower flange 21a of the lower member 21 (shown in FIG. 14). The cavity B to which is supplied is formed over the entire circumference.

  Thereafter, the resin material for bonding 100 in a molten state is filled into the cavity B from a resin passage (not shown) by the resin supply device 33. The molten bonding resin material 100 filled in the cavity B flows in the cavity B and reaches the entire circumference between the upper flange 20a and the lower flange 21a. The bonding resin material 100 partially melts the upper flange 20a and the lower flange 21a, and melts the outer peripheral portion of the pulsation reducing member 3.

  When the bonding resin material 100 in the cavity B is cooled and solidified, as shown in FIG. 14, the upper member 20 and the lower member 21 are bonded over the entire circumference, and the outer peripheral portion of the pulsation reducing member 3 is The upper member 20 and the lower member 21 are joined.

  After the bonding resin material 100 in the cavity B is solidified, the movable platen 37 is moved away from the fixed platen 36 by the die driving device 32, and as shown in FIG. 15, the fixed die 38 and the first movable die 39. And the second movable mold 40 is opened. Thereby, the fuel distribution pipe 1 is obtained.

  As described above, according to this embodiment, the halved upper member 20 and the lower member 21 constituting the main body 2 are molded with a resin material, and the pulsation reducing member 3 is formed into a plate shape with a resin material. By molding, cost reduction can be achieved while obtaining a high pulsation reduction effect by the pulsation reduction member 3. Then, when the open side of the upper member 20 and the lower member 21 are combined to obtain the main body 2, the pulsation reducing member 3 is disposed inside, and then a molten state is formed at the joint portion of the upper member 20 and the lower member 21. By supplying and joining the bonding resin material 100, the bonding resin material 100 can be spread over the entire bonding portion, and the entire bonding portion can be reliably bonded. Thereby, high reliability can be obtained over a long period of time.

  Further, since the pulsation reducing member 3 is welded to the upper member 20 and the lower member 21 by the bonding resin material 100 in the molten state, the number of processes can be reduced in welding the pulsation reducing member 3, and the product can be further increased. Cost can be reduced.

  In addition, after forming the upper member 20 and the lower member 21 using the fixed mold 38 and the first movable mold 39 that slides, the first movable mold 39 in the mold open state is slid to return to the mold closed state. Thus, the main body 2 is obtained, and a cavity B for supplying the molten bonding resin material 100 around the bonding portion of the upper member 20 and the lower member 21 is formed, and the bonding resin material 100 is formed in the cavity B. To supply. In this manner, the cavity B can be formed and joined in the same mold as that at the time of molding without transferring the upper member 20 and the lower member 21 from the fixed mold 38 and the first movable mold 39 to another mold. Therefore, manufacturing man-hours can be reduced.

  In the above-described embodiment, the pulsation reducing member 3 is formed at the same time by the forming device 31 for forming the upper member 20 and the lower member 21. However, the present invention is not limited to this, and the pulsation reducing member 3 is another forming device. The upper member 20 and the lower member 21 may be placed between the two members 20 and 21 in advance.

  As described above, the fuel distribution pipe manufacturing method and the fuel distribution pipe manufacturing apparatus according to the present invention can be applied, for example, when manufacturing a fuel distribution pipe used in a multi-cylinder internal combustion engine of an automobile.

DESCRIPTION OF SYMBOLS 1 Fuel distribution pipe 2 Main-body part 3 Pulsation reduction member 10 Fuel inflow pipe part 10a Fuel inflow hole 12 Fuel discharge pipe part 12a Fuel discharge hole 20 Upper member (1st member)
21 Upper member (second member)
30 Manufacturing apparatus 32 Mold drive apparatus 33 Resin supply apparatus 38 Fixed mold 39 First movable mold 40 Second movable mold

Claims (4)

A fuel inflow hole connected to a fuel pump and a plurality of fuel discharge holes connected to a plurality of injectors, respectively, temporarily stores fuel flowing in from the fuel inflow hole, and then distributes the fuel to the fuel discharge holes A hollow main body for
In a manufacturing method of manufacturing a fuel distribution pipe provided with a pulsation reducing member provided inside the main body part and reducing pulsation of fuel generated inside the main body part,
A first step of molding the half-shaped first and second members constituting the main body portion with a resin material, and molding the pulsation reducing member into a plate shape with a resin material;
When obtaining the main body by combining the open sides of the first and second members formed in the first step, the pulsation reducing member formed in the first step is positioned inside the main body. A second step of arranging;
A molten joining resin material is separately supplied to the joining portion of the first and second members of the main body obtained in the second step, and the open sides of the first and second members are welded by the resin material. And a third step of joining together. A method for manufacturing a fuel distribution pipe. In the manufacturing method of the fuel distribution pipe of Claim 1,
In the third step, the fuel distribution pipe manufacturing method is characterized in that the pulsation reducing member is welded to the first and second members by a bonding resin material. In the manufacturing method of the fuel distribution pipe of Claim 1 or 2,
In the first step, the first and second members are molded using a fixed mold and a movable mold that slides in a direction intersecting the mold opening and mold closing directions with respect to the fixed mold,
In the second step, the first member is held on one of the fixed mold and the movable mold in the mold open state, and the second member is held on the other, and then the movable mold in the mold open state is The first member and the second member are slid until they face each other, and then the mold is closed again to obtain the main body by combining the open sides of the first and second members, and joining the first and second members. Form a cavity to supply the bonding resin material around the part,
In the third step, a method of manufacturing a fuel distribution pipe, wherein a bonding resin material is supplied to the cavity. A fuel inflow hole connected to the fuel pump and a plurality of fuel discharge holes connected to the injector for temporarily storing fuel flowing in from the fuel inflow hole and then distributing the fuel to the fuel discharge holes A hollow body,
In a manufacturing apparatus for manufacturing a fuel distribution pipe provided with a pulsation reducing member provided inside the main body portion and for reducing pulsation of fuel generated inside the main body portion,
While molding the half-shaped first and second members constituting the main body, a molding die for molding the pulsation reducing member into a plate shape,
A resin supply device for supplying a molten resin material into the mold,
The mold is configured to form a cavity for supplying a bonding resin material to a bonding portion of the first and second members,
An apparatus for manufacturing a fuel distribution pipe, wherein the resin material for joining in a molten state is supplied to the cavity by the resin supply device.

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