JP3993611B2 - Mounting structure of fuel injection valve to fuel distribution pipe and mounting method thereof - Google Patents

Description

  The present invention has a fuel injection part inserted into a fuel injection hole of an engine at one end and an outer peripheral surface of an intermediate part of a fuel injection valve having a fuel inlet part inserted into a fuel supply port of a fuel distribution pipe at the other end. An annular connecting groove is formed, and a connecting flange aligned in the axial direction with the connecting groove is formed in the fuel supply port, and the connection member is connected to a connecting member that elastically holds the fuel injection valve and the fuel supply port from both outer sides. The present invention relates to an improved structure for mounting a fuel injection valve on a fuel distribution pipe and a method for mounting the same, which are provided with a flange and a locking groove that engage with a groove and a connecting flange, respectively.

Such a structure for attaching a fuel injection valve to a fuel distribution pipe and a method for attaching the fuel injection valve have already been known, as disclosed in Japanese Patent Application Laid-Open No. H10-228707.
Japanese Patent No. 2837268

In conventional to or Ru fuel injection valve, when connected to the fuel supply port of the fuel distribution pipe by a connecting member to which the provisions of the insertion depth of the fuel supply port of the fuel inlet section, so as to perform through a connecting member Therefore, it is difficult to position the fuel injection valve, the fuel supply port, and the connecting member in the axial direction at the time of connection, so that there is a problem that the fuel injection valve is not easily mounted on the fuel distribution pipe.

  The present invention has been made in view of such circumstances, and the fuel injection valve and the fuel supply port are not required to define the insertion depth of the fuel inlet portion into the fuel supply port via a connecting member. It is an object of the present invention to provide a structure for mounting a fuel injection valve to a fuel distribution pipe and a method for mounting the same, which can be performed between the two.

In order to achieve the above object, the present invention has a fuel injection part inserted into a fuel injection hole of an engine at one end and a fuel inlet part inserted into a fuel supply port of a fuel distribution pipe at the other end. An annular connecting groove is formed on the outer peripheral surface of the intermediate portion of the injection valve, while a connecting flange aligned in the axial direction with the connecting groove is formed in the fuel supply port, and the fuel injection valve and the fuel supply port are elastically formed from both outer sides. a connecting member for clamping the connecting groove and setting the flange portion and the locking groove respectively engage the connecting flange only, the connecting flange and abuts in order to define the insertion depth of the fuel inlet to the fuel supply port In the mounting structure of the fuel injection valve to the fuel distribution pipe, the step portion is integrally formed with a synthetic resin outer shell molded so as to cover the outer periphery of the coil portion of the fuel injection valve. , Engage with the connecting flange A first feature that it has protruding positioning projection defining a rotational position with respect to the fuel supply port of the fuel injection valve by.

The present invention also has a fuel injection part inserted into a fuel injection hole of an engine at one end, a fuel injection valve having a fuel inlet part at the other end, and a fuel having a fuel supply port into which the fuel inlet part is inserted. When attaching to the distribution pipe, the fuel inlet of the fuel injection valve is inserted into the fuel supply port of the fuel distribution pipe, and the connecting flange formed in the fuel supply port is in contact with the step formed in the middle of the fuel injection valve The first step of defining the insertion depth of the fuel inlet to the fuel supply port, and then, from one side of the fuel injection valve and the fuel supply port, these are elastically clamped from both outsides. push the connecting member, and connecting the annular groove formed in the intermediate portion outer peripheral surface of the fuel injection valve, to a connecting flange formed on the fuel supply port, the flange portion is formed in the coupling member and the locking groove is respectively engaged And the second step To the next run, in the mounting method of the fuel injection valve to fuel delivery pipe, when defining the insertion depth of the fuel inlet to the fuel supply port in the first step, positioning projection formed to project outwardly of the stepped portion by engaging with the connecting flanges, to define the rotational position of the fuel injection valve for fuel supply port at the same time it shall be the second feature.

  According to the first aspect of the present invention, the fuel injection valve is provided with a step portion that contacts the connecting flange of the fuel supply port in order to define the insertion depth of the fuel injection valve into the fuel supply port of the fuel distribution pipe. Therefore, the insertion depth of the fuel injection valve into the fuel supply port can be accurately defined between the fuel injection valve and the fuel supply port, and the connecting member is connected between the fuel injection valve and the fuel supply port. Only the function of coupling is achieved, and the attachment of the fuel injection valve to the fuel distribution pipe can be remarkably improved.

  Moreover, since the step portion is integrally formed with a synthetic resin outer shell molded so as to cover the outer periphery of the coil portion of the fuel injection valve, the step portion can be formed together with the synthetic resin outer shell of the fuel injection valve. Therefore, there is no need for post-processing, and the cost can be reduced.

According to the second feature of the present invention , a fuel injection valve having a fuel injection portion inserted into an engine fuel injection hole at one end and a fuel inlet portion at the other end is inserted into the fuel inlet portion. When attaching to a fuel distribution pipe having a fuel supply port, the fuel inlet of the fuel injection valve is inserted into the fuel supply port of the fuel distribution pipe, and the connecting flange formed in the fuel supply port is connected to the middle of the fuel injection valve. A first step for defining the insertion depth of the fuel inlet portion into the fuel supply port by contacting the formed step portion, and then from one side of the fuel injection valve and the fuel supply port, from both sides The connecting member is pushed so as to be elastically clamped, and the annular connecting groove formed on the outer peripheral surface of the intermediate portion of the fuel injection valve and the connecting flange formed on the fuel supply port are connected to the flange portion and the engaging member formed on the connecting member. to respectively engage the groove Since the second step is sequentially executed, the axial connection between the fuel supply port and the fuel injection valve by the connecting member is performed after the insertion depth of the fuel inlet to the fuel supply port is defined, and therefore If the connecting member is pushed from one side of the fuel injection valve and the fuel supply port so that they are elastically clamped from both sides, the annular connection groove of the fuel injection valve and the connection flange of the fuel supply port the flange portion of the coupling member and the locking groove respectively can Rukoto is properly engaged, the mounting of the fuel distribution pipe of the fuel injection valve can be significantly improved.

Furthermore , when the insertion depth of the fuel inlet to the fuel supply port is defined in the first step, the rotational direction position of the fuel injection valve with respect to the fuel supply port is simultaneously defined, so the insertion of the fuel inlet to the fuel supply port It is possible to simultaneously define the depth and the rotational direction position of the fuel injection valve with respect to the fuel supply port, and to further improve the mountability of the fuel injection valve to the fuel distribution pipe.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.

  1 is a longitudinal sectional view of a principal part of a fuel injection type engine, FIG. 2 is an enlarged view around the fuel injection valve of FIG. 1, FIG. 3 is a sectional view taken along line 3-3 in FIG. 2, and FIG. FIG. 5 is an exploded view corresponding to FIG. 2, FIG. 6 is an enlarged view taken along arrow 6 in FIG. 5, and FIG. 7 is a perspective view of the connecting member.

  First, in FIG. 1, a fuel injection hole 3 is provided in an intake manifold 2 joined to a cylinder head 1 of an engine E, and a fuel injection part 5 at a lower end portion of an electromagnetic fuel injection valve I is provided via a seal member 7. Fitted. The fuel inlet 6 at the upper end of the fuel injection valve I is fitted into the fuel supply port 16 of the fuel distribution pipe D via the seal member 8. The fuel distribution pipe D is fixed at a predetermined position of the intake manifold 2 by fixing means (not shown).

  A plurality of fuel injection holes are opened in the end face of the fuel injection section 5 so that fuel is injected in a plurality of directions toward a downstream end branched into a plurality of intake ports 1a of the cylinder head 1.

  The fuel injection valve I is attached to the fuel distribution pipe D, and the attachment structure will be described below with reference to FIGS.

  As shown in FIGS. 2 to 5, the axial intermediate portion of the fuel injection valve I is covered with a synthetic resin outer shell 10 molded so as to cover the inner coil. The coupler body 11, the connecting groove 12 and the positioning projection 13 are integrally formed. The connection groove 12 is formed in an annular shape so as to surround the outer peripheral surface of the outer skin 10, and the positioning projection 13 crosses the connection groove 12 on the opposite side of the coupler body 11 across the axis of the fuel injection valve I and the fuel injection valve I. It is formed to extend in the axial direction. In the illustrated example, the positioning protrusion 13 protrudes toward the fuel inlet portion 6 after traversing the connecting groove 12 and is tapered toward the fuel inlet portion 6 (see FIG. 6).

Further, the positioning projection 13 is formed with a step portion 13 a that contacts the lower surface of the connecting flange 17, and the contact depth defines the insertion depth of the fuel supply port 16 and the fuel inlet portion 6. The distance between the connecting flange 17 and the connecting groove 12 at this time is set equal to the distance between a locking groove 21 and a flange 22 of the connecting member 20 described later.

On the other hand, the fuel distribution pipe D is made of a pressed steel plate, and includes a fuel passage portion 15 and a fuel supply port 16 coupled to a fuel distribution portion 15a protruding to one side of the fuel passage portion 15. The fuel supply port 16 is open at the lower end, and the fuel inlet 6 of the fuel injection valve I is fitted into the fuel supply port 16 via the seal member 8 as described above. A connecting flange 17 is integrally formed at the lower end of the fuel supply port 16, and a notch-shaped positioning hole 18 is provided at a predetermined outer peripheral position thereof.

  When the fuel inlet 6 is fitted to the fuel supply port 16, the positioning projection 13 of the fuel injection valve I is engaged with the positioning hole 18 of the connecting flange 17, whereby the rotation direction of the fuel injection valve I with respect to the fuel distribution pipe D is rotated. A position is defined. Since the fuel distribution pipe D is fixed to a predetermined position of the intake manifold 2 as described above, the fuel injection valve I is eventually defined in the rotational direction position with respect to the intake manifold 2. Fuel can be injected from a plurality of fuel injection holes of the fuel injection unit 5 in a plurality of prescribed directions.

  The fuel injection valve I is also connected to the fuel supply port 16 in the axial direction by the connecting member 20 using the connecting groove 12. The connecting member 20 is made of a steel plate or a synthetic resin, and is U-shaped from a pair of side plate portions 20a and 20a facing each other and a connecting plate portion 20b that integrally connects one end of the side plate portions 20a and 20a. It has a moderate elasticity as a whole. The side plate portions 20a and 20a are provided with locking grooves 21 and 21 with which the connecting flange 17 is engaged, and flange portions 22 and 22 that are bent inward from one side edge of the side plate portions 20a and 20a, respectively. It is formed. The distance A between the side plate portions 20a, 20a is set to be equal to or slightly smaller than the outer diameter D1 of the fuel supply port 16. The distance B between the flanges 22 and 22 is set to be sufficiently smaller than the groove bottom diameter D2 of the connecting groove 12, and the bottom of the connecting groove 12 is engaged with the center of each flange 22 and 22. Arc-shaped locking recesses 22a, 22a are provided.

  Next, the operation of this embodiment will be described.

In attaching the fuel injection valve I to the fuel distribution pipe D, first, the fuel inlet 6 of the fuel injection valve I is inserted into the fuel supply port 16. Then, the positioning protrusion 13 of the fuel injection valve I is engaged with the positioning hole 18 of the connecting flange 17, and the step portion 13 a of the positioning protrusion 13 is brought into contact with the lower surface of the connecting flange 17. As a result, the distance between the connecting flange 17 and the connecting groove 12 becomes equal to the distance between the locking groove 21 and the flange portion 22 of the connecting member 20, and then the connecting member 20 is moved from the side on the positioning projection 13 side to the fuel injection valve. When the I and the fuel supply port 16 are pushed, the both side plates 20a and 20a of the connecting member 20 are once expanded by the fuel injection valve I and the fuel supply port 16, and the connecting groove 12 of the fuel injection valve I is formed on both side plates. The connecting flange 17 of the fuel supply port 16 reaches the engaging position with the locking grooves 21 and 21 of the both side plate portions 20a and 20a while reaching the engaging position with the flange portions 22 and 22 of the portions 20a and 20a . When, side plate portions 20a of the coupling member 20, 20a sandwiched Shinano an outer circumferential surface of the fuel supply port 16 is engaged with et locking grooves 21, 21 on both sides of the connecting flange 17 by an elastic restoring force, also The flanges 22 and 22 are engaged with the connecting groove 12, and the locking recesses 22 a and 22 a of the flanges 22 and 22 are engaged with the bottom of the connecting groove 12.

  In this way, the fuel injection valve I is connected to the fuel supply port 16 via the connecting member 20, and the connecting member 20 engages the engaging grooves 21, 21 and the connecting flange 17, and engages the flanges 22, 22. The engaging portions 22a and 22a are engaged with the bottoms of the connecting grooves 12 so that they are held at the connecting position, and do not slip out due to vibration or the like.

Thus, positioning of the rotation direction of the fuel injection valve I for the fuel distribution pipe D, as intends line only in engagement with one point of the positioning hole 18 of the positioning projection 13 and the fuel distribution pipe D of the fuel injection valve I Therefore, there is no accumulation of play of the positioning engagement, and the positioning accuracy of the fuel injection valve I in the rotational direction can be improved.

Moreover, since the axial connection between the fuel distribution pipe D and the fuel injection valve I by the connecting member 20 is necessarily performed after the fuel injection valve I is positioned in the rotational direction, the positioning operation and the connection operation are sequentially performed. By doing so, it can be performed easily, and the attachment property of the fuel injection valve I to the fuel distribution pipe D is very good.

  At this time, in particular, the insertion depth of the fuel injection valve I into the fuel supply port 16 is defined by the contact between the connection flange 17 and the stepped portion 13 a of the positioning protrusion 13. Since the distance is made equal to the distance between the engaging groove 21 and the flange portion 22 of the connecting member 20, the alignment of the connecting flange 17 and the engaging groove 21, and the connecting groove 12 and the flange portion 22 is automatically performed. Thus, even if a robot is used, the fuel distribution pipe D and the fuel injection valve I can be easily and accurately connected by the connecting member 20.

Further, since the positioning projection 13 is tapered toward the fuel inlet 6, when the fuel injection valve I is inserted into the fuel supply port 16, the positioning projection 13 can be easily engaged with the positioning hole 18. it is possible to perform, after their engagement may further enhance the positioning accuracy in the rotational direction of the positioning projections 13 and backlash to the smaller fuel injection valve I between the positioning hole 18.

  Further, since the connecting groove 12 and the positioning projection 13 are integrally formed with the synthetic resin outer shell 10 molded so as to cover the outer periphery of the coil portion of the fuel injection valve, the connecting groove 12 and the positioning projection 13 are injected into the fuel injection valve. Since it can be molded together with the synthetic resin outer skin 10 of the valve I, there is no need for post-processing, and the cost can be reduced.

  Further, since the positioning protrusion 13 is formed so as to be connected to the bottom portion of the connecting groove 12, the root of the positioning protrusion 13 is thickened to increase its strength and increase the strength of the fuel injection valve I around the connecting groove 12. Can also be increased.

  The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the invention. For example, the notch-shaped positioning hole 18 of the connecting flange 17 in the fuel supply port 16 may be a circular hole or a concave hole. In addition, the positioning hole 18 can be tapered toward the fuel inlet 6.

The principal part longitudinal cross-sectional view of a fuel-injection type engine. The enlarged view around the fuel injection valve of FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. The exploded view corresponding to FIG. FIG. 6 is an enlarged view taken along arrow 6 in FIG. 5. The perspective view of a connection member.

Explanation of symbols

E ... Engine D ... Fuel distribution pipe I ... Fuel injection valve 3 ... Fuel injection hole 5 ... Fuel injection part 6 ... Fuel Inlet 10 ··· Outer skin 12 ··· Connection groove 13 ··· Positioning protrusion 13a ··· Step 16 ··· Fuel supply port 17 ··· Connection flange 18 ··· Positioning hole 20 ... connecting member 21 ... locking groove 22 ... flange portion

Claims (2)

A fuel inlet (5) inserted into the fuel injection hole (3) of the engine (E) at one end and a fuel inlet inserted into the fuel supply port (16) of the fuel distribution pipe (D) at the other end An annular connecting groove (12) is formed on the outer peripheral surface of the intermediate portion of the fuel injection valve (I) having (6), and the connecting flange (17) aligned in the axial direction with the connecting groove (12) is connected to the fuel supply port. (16) formed on the connecting member (20) that elastically clamps the fuel injection valve (I) and the fuel supply port (16) from both outer sides, and the connecting groove (12) and the connecting flange (17), respectively. flange portion engaging (22) and locking groove (21) set only, said fuel inlet to the fuel supply port (16) and (6) the connecting flange in order to define the insertion depth (17) This Mold the step (13a) in contact with the outer periphery of the coil of the fuel injection valve (I). Molded integrally with the form to be made of synthetic resin outer skin (10), in the mounting structure of a fuel injection valve to fuel delivery pipe,
A positioning projection (13) that defines the rotational position of the fuel injection valve (I) relative to the fuel supply port (16) by engaging with the connecting flange (17) on the outside of the stepped portion (13a). A structure for mounting a fuel injection valve to a fuel distribution pipe, characterized by a protruding formation . A fuel injection valve (I) having a fuel injection part (5) inserted into the fuel injection hole (3) of the engine (E) at one end and a fuel inlet part (6) at the other end is provided with the fuel inlet part. When attaching to the fuel distribution pipe (D) having the fuel supply port (16) into which (6) is inserted,
The fuel inlet (6) of the fuel injection valve (I) is inserted into the fuel supply port (16) of the fuel distribution pipe (D), and the fuel is injected into the connecting flange (17) formed in the fuel supply port (16). A first step for defining the insertion depth of the fuel inlet (6) into the fuel supply port (16) by contacting a step (13a) formed in the middle of the valve (I), and then the fuel From one side of the injection valve (I) and the fuel supply port (16), the connecting member (20) is pushed so as to elastically hold them from both outsides, and the outer peripheral surface of the intermediate portion of the fuel injection valve (I) An annular connecting groove (12) formed on the connecting member (20) and a connecting flange (17) formed on the fuel supply port (16) are provided with a flange (22) and a locking groove (21) formed on the connecting member (20). sequentially executes a second step of Ru is respectively engaged, preparative fuel injection valve to the fuel distribution pipe In the only way,
When the insertion depth of the fuel inlet portion (6) to the fuel supply port (16) is defined in the first step, the positioning protrusion (13) formed to protrude outside the step portion (13a) is connected to the connecting flange ( 17) A method for mounting a fuel injection valve on a fuel distribution pipe, wherein the rotational direction position of the fuel injection valve (I) with respect to the fuel supply port (16) is simultaneously defined by engaging with the fuel supply port (17) .

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