JP6304759B2 - Method for assembling fuel supply apparatus and jig used therefor - Google Patents

Description

  The present invention relates to a method for assembling a fuel supply device for supplying fuel to an engine and a jig used therefor.

  A fuel supply device that supplies fuel to an engine of an automobile includes a plurality of injectors that inject fuel into an air supply port of each cylinder, and a fuel supply pipe that supplies fuel to the plurality of injectors. The injector and the fuel supply pipe are prevented from coming off by fitting the base end of the injector into a plurality of openings provided in the fuel supply pipe and attaching clips that engage with both of them.

  For example, Patent Document 1 below shows a clip 100 as shown in FIG. The clip 100 has a substantially U shape having a pair of sandwiching portions 110 and a connecting portion 120 that couples one end portions of the pair of sandwiching portions 110 to each other. As shown in FIG. 10, the clip 100 is mounted so as to sandwich the injector 200 from both sides in the diameter direction with a pair of sandwiching portions 110. Then, the inner diameter end of each clamping part 110 of the clip 100 is fitted into the annular groove 201 provided on the outer peripheral surface of the injector 200, and the flange provided at the lower end of the fuel supply pipe 300 in the slit 112 of each clamping part 110. By fitting the part 301, the clip 100 prevents the injector 200 and the fuel supply pipe 300 from coming off.

JP-A-9-291866

  The fuel supply device is assembled, for example, by attaching the clip 100 to each injector 200 and then attaching the temporary assembly to the fuel supply pipe 300. Specifically, a temporary assembly including the clip 100 and the injector 200 is approached from below to the opening of the fuel supply pipe 300 shown in FIG. 10, and the fuel supply pipe 300 is interposed between the pair of sandwiching portions 110 of the clip 100. Assembling is completed by pushing the flange portion 301 and fitting the flange portion 301 of the fuel supply pipe 300 into the slit 112 of the clip 100.

  At this time, when the flange portion 301 of the fuel supply pipe 300 is pushed between the pair of sandwiching portions 110, the pair of sandwiching portions 110 are expanded in a C shape as indicated by the dotted line in FIG. For this reason, since the force of the direction which the connection part 120 leaves | separates from the fuel supply pipe 300 (refer the arrow in a figure) is added to the clip 100, there exists a possibility that the clip 100 may shift | deviate to the arrow direction with respect to the fuel supply pipe 300. In particular, as shown in FIG. 11, when the protrusions 302 provided in the fuel supply pipe 300 are fitted into the recesses 121 provided in the connecting part 120 of the clip 100, the clip 100 is prevented from rotating with respect to the fuel supply pipe 300. If the clip 100 is misaligned, the connecting portion 120 of the clip 100 rides on the protrusion 302 of the fuel supply pipe 300, and it may not be possible to fit them.

  A technical problem to be solved by the present invention is to reliably prevent displacement of the clip with respect to the fuel supply pipe when assembling the fuel supply device.

  The present invention made to solve the above problems includes an injector for injecting fuel from a tip, a fuel supply pipe attached to the base end of the injector, and supplying fuel to the injector, the injector and the fuel supply pipe And a method of assembling the fuel supply device including a clip for preventing the disconnection. The clip includes a pair of sandwiching portions that sandwich the injector from both sides in the diameter direction, and a connecting portion that connects one end portions of the pair of sandwiching portions. The assembling method includes a step of attaching the clip to the injector to form a temporary assembly by holding the base end of the injector from both sides in the diameter direction with the pair of holding portions, and a jig set. The temporary assembly is brought close to the opening of the fuel supply pipe, and the movement of the connecting portion of the clip to the side away from the fuel supply pipe is restricted by a restriction member provided in the jig, A step of pushing the fuel supply pipe between a pair of clamping parts and mounting the temporary assembly on the fuel supply pipe.

  The above assembling method is used for assembling a temporary assembly including an injector and a clip to a fuel supply pipe, and is a jig on which the fuel supply pipe is set. The fuel supply pipe between the pair of sandwiching portions of the clip provided in the temporary assembly, the pair of sandwiching portions sandwiched from each other, and a connecting portion that connects one end portions of the pair of sandwiching portions. Can be realized using a jig having a regulating member that regulates movement of the connecting portion of the clip to the side away from the fuel supply pipe.

  Thus, in the present invention, the regulating member that regulates the movement of the connecting portion of the clip to the side away from the fuel supply pipe is provided in the jig for setting the fuel supply pipe. Accordingly, even when the fuel supply pipe is pushed between the pair of sandwiching portions of the clip and the pair of sandwiching portions are spread out, the movement of the clip can be regulated by the regulating member. Misalignment can be reliably prevented.

  The fuel supply device has a configuration in which a concave portion opened on a proximal end side of the injector is provided in the coupling portion of the clip, and a protrusion that fits into the concave portion is provided on an outer peripheral surface of the fuel supply pipe. Can do. Thereby, the relative rotation prevention of both can be performed by engaging the recessed part of the connection part of a clip, and the protrusion of a fuel supply pipe in the circumferential direction. In assembling such a fuel supply device, when inserting the convex portion of the fuel supply pipe from the opening side of the concave portion of the clip while pushing the fuel supply pipe between a pair of sandwiching portions of the clip, As described above, by restricting the movement of the clip by the restriction member provided on the jig, it is possible to reliably prevent the clip connecting portion from climbing on the protrusion of the fuel supply pipe. In particular, when the fuel supply pipe is formed of resin, it is difficult to increase the height of the protrusions, and thus there is a high risk of the above-described climbing. Therefore, it is desirable to apply the present invention to restrict the movement of the connecting portion of the clip to the side away from the fuel supply pipe.

  As described above, according to the present invention, when the fuel supply device is assembled, it is possible to reliably prevent the positional deviation of the clip with respect to the fuel supply pipe.

It is a front view of a fuel supply apparatus. (A) is a front view of the fuel supply pipe | tube of the said fuel supply apparatus, (b) is the same bottom view. It is a side view of the injector of the said fuel supply apparatus. It is a perspective view of the clip of the said fuel supply apparatus. (A) is the front view of the said clip, (b) is the top view seen from the B direction of (a) figure, (c) is the side view seen from the C direction of (a) figure. (A) is a top view of the said fuel supply pipe set to the jig | tool, (b) is the same front view. (A) is a top view which shows a mode that the temporary assembly of a clip and an injector is assembled | attached to a fuel supply pipe, (b) is the side view, (c) is the front view. It is a top view which shows a mode that the said temporary assembly is assembled | attached to a fuel supply pipe, (a) shows the state which the clip and the flange part contact | abutted, (b) shows the state which assembly | attachment was completed. It is a perspective view of the conventional clip. It is sectional drawing of the conventional fuel supply apparatus. It is a side view which shows a mode that the conventional clip is attached to a fuel supply pipe.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  The fuel supply device 1 shown in FIG. 1 includes a fuel supply pipe 10, a plurality of injectors 20 attached to the fuel supply pipe 10, and a clip 30 that prevents the fuel supply pipe 10 and each injector 20 from coming off. The fuel supply device 1 of the present embodiment is a dual injector type fuel supply device in which a pair of injectors 20 are inserted into each cylinder. The fuel supply apparatus 1 in the illustrated example is for a three-cylinder engine, and a total of six injectors 20 are provided. The fuel supply device 1 is attached to an intake manifold, and by attaching the intake manifold to the engine, a pair of injectors 20 is arranged at the supply port of each cylinder (not shown). In the following description of the fuel supply device 1, for convenience, the central axis direction and the circumferential direction of the injector 20 are referred to as “axial direction” and “circumferential direction”, and the distal end side (lower side in FIG. 1) of the injector 20 is downward. The base end side is referred to as the upper side.

  As shown in FIG. 2, the fuel supply pipe 10 includes a main supply pipe 11 and a plurality of sub supply pipes 12 branched from the main supply pipe 11 and extending downward and having lower ends opened. The fuel supply pipe 10 is formed of resin or metal. In this embodiment, the fuel supply pipe 10 is formed by injection molding of resin. Part of the outer peripheral surface of the pair of adjacent auxiliary supply pipes 12 is connected. Thereby, a minute gap is not formed between a pair of adjacent auxiliary supply pipes 12, and the moldability is improved.

  A flange portion 13 that engages with the clip 30 in the axial direction is provided on the outer peripheral surface of the lower end of each sub supply pipe 12 of the fuel supply pipe 10. In the illustrated example, flange portions 13 are provided on both sides of the diameter direction {vertical direction in FIG. 2B} of the sub supply pipe 12 orthogonal to the extending direction of the main supply pipe 11 (left and right direction in FIG. 2). In addition, the flange portion 13 may be continuously provided on the entire circumference of the sub supply pipe 12.

  On the outer peripheral surface of each sub supply pipe 12, there is provided a protrusion 14 that protrudes to the outer diameter and engages with the clip 30 in the circumferential direction. In the illustrated example, protrusions 14 are provided at the ends on both sides in the extending direction of the main supply pipe 11 (left and right direction in FIG. 2) in the outer peripheral surfaces of the pair of integrated sub supply pipes 12. The protrusion 14 has a simple shape without a bent portion or the like, and protrudes straight from the outer peripheral surface of the sub supply pipe 12 with the same cross section. In the illustrated example, the protrusion 14 has a rectangular parallelepiped shape.

  As shown in FIG. 3, the injector 20 includes a main body 21, a nozzle 22 provided below the main body 21, and a connector 23 provided branched from the main body 21. The nozzle 22 has an injection port for injecting fuel at the tip. An electromagnetic valve (not shown) that opens and closes the nozzle 22 is provided inside the main body 21. The connector 23 is connected to a wiring extending from an external control unit, whereby the opening / closing operation of the electromagnetic valve, that is, the timing of fuel injection from the nozzle 22, the injection amount, and the like are controlled.

  A seal ring 24, an annular groove 25, and a protruding portion 26 are provided at the upper end of the main body 21 of the injector 20. The seal ring 24 is formed of an elastic member such as rubber and is fitted into an annular seal ring mounting groove (not shown) provided on the outer peripheral surface of the main body 21. The annular groove 25 is provided below the seal ring 24. The protruding portion 26 does not have a bent portion, and protrudes from the outer peripheral surface of the main body 21 to the outer diameter. In the example of illustration, the protrusion part 26 is formed in a rectangular parallelepiped shape. The protruding portion 26 is provided below the annular groove 25. The protruding portion 26 is provided on the opposite side of the connector 23. In the illustrated example, the thickness of the protruding portion 26 is constant in the radial direction, but in order to ensure the strength of the protruding portion 26, the axial thickness and circumferential direction of the inner diameter side portion of the protruding portion 26 The wall thickness or both of these may be made larger than the outer diameter side portion. Moreover, the shape of the protrusion part 26 is not restricted to a rectangular parallelepiped shape, For example, it is good also as a column shape.

  As shown in FIGS. 4 and 5, the clip 30 has a substantially U-shape including a pair of sandwiching portions 31 and a connecting portion 32 that couples one end portions of the pair of sandwiching portions 31. Between the pair of sandwiching portions 31, an opening 33 is provided that opens to the other end side (upward in FIG. 5B). The minimum opening dimension L of the opening 33 is smaller than the diameter of the injector 20 (specifically, the diameter D of the groove bottom surface of the annular groove 25) {see FIG. 5B}. In the illustrated example, the entire clip 30 including the pair of sandwiching portions 31 and the connecting portion 32 is integrally formed by pressing a metal plate.

  Each clamping part 31 has a side part 31a extending in the axial direction, a bottom part 31b extending from the lower end of the side part 31a toward the inner diameter side, and a guide part 31c provided above the side part 31a. The side portions 31 a of the pair of sandwiching portions 31 are provided in parallel and face each other in the diameter direction of the injector 20. The side portion 31a is formed with a slit 34 as a recess into which the flange portion 13 of the sub supply pipe 12 of the fuel supply pipe 10 is fitted. As shown in FIG. 5B, an arc portion 31b1 and an inclined portion 31b2 provided on the opening side (upper side in the drawing) of the arc portion 31b1 are formed on the inner diameter side edge of the bottom portion 31b. The arc portion 31b1 has the same arc shape as the groove bottom surface of the annular groove 25 of the injector 20. The pair of inclined portions 31b2 are spaced apart toward the opening side. The guide portion 31c extends from the upper end of the side portion 31a in a direction inclined upward toward the outer diameter side. That is, the gap between the guide portions 31c provided in the pair of sandwiching portions 31 is increased upward.

  At the other end of each clamping part 31 (the end opposite to the end where the connecting part 32 is connected), a protrusion 35 protruding toward the tip side (downward in FIG. 4) of the injector 20 is provided. In the illustrated example, the protrusions 35 are provided on both of the pair of sandwiching portions 31. The protrusion 35 is provided at a position engageable with the protruding portion 26 of the injector 20 attached to the clip 30 in the circumferential direction. By engaging these in the circumferential direction, the positioning of the clip 30 in the circumferential direction with respect to the injector 20 is performed. Is done.

  The connecting portion 32 has a substantially U shape in plan view, and both ends are smoothly connected to the respective holding portions 31 {see FIG. 5B}. The connecting portion 32 is provided with a concave portion 32a opened upward (see FIGS. 4 and 5C). In the illustrated example, the concave portion 32 a is provided in the central portion in the longitudinal direction of the connecting portion 32. As the connecting portion 32 is elastically deformed and curved, the size of the opening dimension L of the opening 33 changes.

  In the fuel supply device 1, as shown in FIG. 6, the inner diameter ends (the arc portions 31 b 1 of the bottom portion 31 b) of the pair of sandwiching portions 31 of the clip 30 are fitted into the annular groove 25 of the injector 20, and these are axial directions. Engage with. Further, the flange portion 13 of the sub supply pipe 12 is fitted into the slits 34 of the pair of sandwiching portions 31 of the clip 30, and these are engaged in the axial direction. As described above, the auxiliary supply pipe 12 and the injector 20 are engaged with each other in the axial direction via the clip 30, and both are prevented from coming off.

  Moreover, in said fuel supply apparatus 1, the protrusion 14 of the sub supply pipe 12 fits into the recessed part 32a of the connection part 32 of the clip 30, and these engage in the circumferential direction {refer FIG.8 (c)}. Further, the protrusion 35 of the clip 30 and the protruding portion 26 of the injector 20 are engaged in the circumferential direction {see FIG. 5B}. As described above, the circumferential positioning of the injector 20 with respect to the auxiliary supply pipe 12 is performed via the clip 30.

  In the present embodiment, as shown in FIG. 1, the outer diameter ends of the connectors 23 of the pair of injectors 20 attached to the pair of integrated sub supply pipes 12 are separated from each other. Thereby, it becomes easy to attach the wiring to the connector 23 of each injector 20.

  Hereinafter, a method for assembling the fuel supply apparatus 1 having the above-described configuration will be described.

  First, the clip 30 is attached to the injector 20 to form the temporary assembly A. Specifically, these are integrated by pushing the injector 20 between the pair of sandwiching portions 31 of the clip 30. At this time, the inner diameter ends (the arc portions 31b1 of the bottom portion 31b) of the pair of sandwiching portions 31 of the clip 30 are fitted into the annular groove 25 of the injector 20, and these are engaged in the axial direction. Further, the protruding portion 26 of the injector 20 and the protrusion 35 of the clip 30 are engaged in the circumferential direction.

  Next, the temporary assembly A of the clip 30 and the injector 20 is attached to the sub supply pipe 12 of the fuel supply pipe 10. Specifically, first, the fuel supply pipe 10 is set on a jig. In the present embodiment, the fuel supply pipe 10 is set on the jig so that the axial directions of the main supply pipe 11 and the sub supply pipe 12 are horizontal. In the description of this process, in the moving direction of the temporary assembly A, the side approaching the sub supply pipe 12 is referred to as “back side” and the opposite side is referred to as “front side”.

  Although the detailed illustration of the jig is omitted, in the state where movement in the longitudinal direction of the fuel supply pipe 10 (the axial direction of the main supply pipe 11) and the short direction (the axial direction of the auxiliary supply pipe 12) is restricted, The supply pipe 10 is held. This jig is provided with a regulating member 40 shown in FIG. The regulating member 40 is provided on the front side of the fuel supply pipe 10 set on the jig. The regulating member 40 is provided with a regulating surface 41 that comes into contact with the connecting portion 32 of the clip 30 attached to the sub supply pipe 12 from the outer diameter side. In the illustrated example, a regulating surface 41 is provided on the front side of the protrusion 14 of the sub supply pipe 12. The restricting surface 41 is provided at the same radial position as the outer diameter surface of the protrusion 14 or slightly on the inner diameter side.

  Then, as shown in FIGS. 7A and 7B, the temporary assembly A is disposed coaxially with the sub supply pipe 12, and the base end of the temporary assembly A is brought close to the opening of the sub supply pipe 12. . At this time, as shown in FIG. 7C, the phase of the opening 33 of the clip 30 and the phase of the connection portion 12a are matched so that the connection portion 12a of the adjacent sub supply pipe 12 and the clip 30 do not interfere with each other. Let Thereby, the phase of the slit 34 provided in the pair of sandwiching portions 31 of the clip 30 and the phase of the flange portion 13 of the sub supply pipe 12 coincide with each other, and the phase of the concave portion 32 a of the coupling portion 32 of the clip 30 and the sub supply. The phase of the projection 14 of the tube 12 matches. In FIG. 7, the connector 23 and the like of the injector 20 are not shown.

  When the temporary assembly A is brought close to the sub supply pipe 12, the guide portions 31 c of the pair of sandwiching portions 31 of the clip 30 come into contact with the flange portion 13 of the sub supply pipe 12 as shown in FIG. At this time, the outer diameter surface of the coupling portion 32 of the clip 30 is opposed to the regulation surface 41 of the regulation member 40 via a minute gap. When the temporary assembly A is further pushed in from this state, the flange portion 13 is pushed between the pair of side portions 31a while being guided by the guide portion 31c. As a result, the pair of sandwiching portions 31 are expanded in a C shape while the connecting portion 32 is elastically deformed, so that the side where the connecting portion 32 is separated from the auxiliary supply pipe 12 on the clip 30 (outer diameter side, left side in the figure) ) Is applied (see FIG. 11). At this time, movement of the clip 30 can be prevented by the restriction surface 41 of the restriction member 40 coming into contact with the connecting portion 32 of the clip 30 from the outer diameter side. In particular, the restricting surface 41 of the restricting member 40 is arranged at the same radial position as the outer diameter surface of the protrusion 14 of the auxiliary supply pipe 12 or slightly inside the connection, so that the connecting portion 32 of the clip 30 is protruded 14. The situation of getting on can be reliably regulated.

  In this state, when the temporary assembly A is further pushed into the back side, the base end of the injector 20 is inserted into the inner periphery of the sub supply pipe 12 as shown in FIG. Then, the protrusion 14 of the sub supply pipe 12 is fitted into the recess 32 a of the connecting portion 32, and the flange portion 13 is fitted into the slit 34 of the clip 30. At this time, since the regulating surface 41 of the regulating member 40 is in contact with the connecting portion 32 from the outer diameter side, the situation where the connecting portion 32 rides on the protrusion 14 of the sub supply pipe 12 is avoided to the end, and the concave portion of the connecting portion 32 is obtained. 32a and the protrusion 14 of the sub supply pipe 12 can be reliably fitted. Thus, the assembly of the injector 20 to the auxiliary supply pipe 12 of the fuel supply pipe 10 is completed. The fuel supply apparatus 1 shown in FIG. 1 is completed by performing the above operation on each injector 20.

  The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the case where the protrusion 14 provided on the sub supply pipe 12 is fitted into the recess 32a provided on the coupling portion 32 of the clip 30 has been shown. However, such a protrusion 14 and recess 32a are provided. The present invention can be applied even to a fuel supply device that is not.

  The direction in which the temporary assembly A composed of the clip 30 and the injector 20 is inserted into the fuel supply pipe 10 is not limited to the above. For example, the fuel supply pipe 10 is cured with the opening of the sub supply pipe 12 facing downward. The temporary assembly A may be assembled from below by being set on a tool.

DESCRIPTION OF SYMBOLS 1 Fuel supply apparatus 10 Fuel supply pipe 11 Main supply pipe 12 Sub supply pipe 13 Flange part 14 Protrusion 20 Injector 30 Clip 31 Clamping part 32 Connection part 32a Recess 40 Restriction member A Temporary assembly

Claims (2)

A fuel supply comprising an injector for injecting fuel from a tip, a fuel supply pipe attached to the base end of the injector, for supplying fuel to the injector, and a clip for preventing the injector and the fuel supply pipe from coming off A method for assembling the apparatus,
The clip has a pair of clamping portions that clamp the injector from both sides in the diameter direction, and a connecting portion that connects one end portions of the pair of clamping portions,
Attaching the clip to the injector to form a temporary assembly by sandwiching the proximal end of the injector from both sides in the diameter direction with the pair of sandwiching portions; and
The temporary assembly is brought close to the opening of the fuel supply pipe set in the jig, and the movement of the connecting portion of the clip to the side away from the fuel supply pipe is restricted by a restriction member provided in the jig. An assembly method for a fuel supply apparatus, further comprising a step of pushing the fuel supply pipe between a pair of holding portions of the clip and mounting the temporary assembly on the fuel supply pipe. A jig used to assemble a temporary assembly comprising an injector and a clip to a fuel supply pipe, and the fuel supply pipe is set,
The clip has a pair of clamping portions that clamp the injector from both sides in the diameter direction, and a connecting portion that connects one end portions of the pair of clamping portions,
A restriction member for restricting movement of the connecting portion of the clip to the side away from the fuel supply pipe when the fuel supply pipe is pushed between a pair of holding portions of the clip provided in the temporary assembly; Jig with.

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