JP2012047055A - Injector connection device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the ease of assembly work, in an injector connection device in which an injector 1 and an injector connection socket 6 of a fuel delivery pipe are retained and detachably connected with each other by a connection member 9 fitted to them while the injector is rotatable around its axis, and an energizing connector 8 comes near or abuts on a base end plate 9c of the connection member assembled on a predetermined position to prevent the rotation of the injector around its axis, when the energizing connector is connected to the injector.SOLUTION: A stopper means 18 is disposed between the injector and the connection member. When the injector is at a rotation position where the injector can be connected to the energizing connector, the stopper means prevents the rotation of the injector in a direction beyond the rotation position where the injector can be connected, but allows rotation in a direction the reverse thereof.

Description

  The present invention relates to an apparatus for connecting an injector (fuel injection valve) for injecting and supplying fuel to a fuel delivery pipe for distributing fuel from a fuel pump to each cylinder in a fuel injection type internal combustion engine. is there.

  Conventionally, an injector for fuel injection in an internal combustion engine is connected by removably inserting a nozzle portion at the tip thereof into an injector loading hole provided in a cylinder head or an intake manifold or the like, while a fuel inlet portion at the other end is connected. The connection is made by detachably fitting to the injector connection socket provided on the fuel delivery pipe arranged along the cylinder head.

  Conventionally, in the injector mounted as described above, the leakage test at the connection part to the injector loading hole such as the cylinder head or the intake manifold and the connection part to the injector connection socket of the fuel delivery pipe is performed as follows. In a state where an appropriate internal pressure is applied to the two connecting portions, the injector is reciprocated around its axis within an appropriate angle range and rotated.

Patent Document 1 as a prior art
“In the connecting part between the injector and the injector connection socket in the fuel delivery pipe, a connecting member that is U-shaped when viewed from the axial direction, and the left and right side plates of the connecting member are connected to the injector connecting socket. The coupling member is detachably fitted so as to be non-rotatably engaged around the axis, and the connecting member can be freely rotated around the axis to the injector connection socket of the fuel delivery pipe. The coupling member is fitted from the side of the energizing connector that is detachably connected to the left and right sides of the injector, while the energizing connector is When connected to the injector, a base that connects the two side plates among the connecting members assembled at a predetermined position. A plate, configured to the current-carrying connector is Setto or close so as to prevent its axis of rotation in the injector. "
Propose that.

  According to this prior art configuration, when the injector is connected to the injector connection socket in the fuel delivery pipe by the connecting member, the energization connector in the injector is removed around the axis. Since it can be rotated, the leakage test at each connecting portion can be performed while rotating the injector around its axis.

  On the other hand, since the connecting member cannot be removed unless the energizing connector is pulled out from the injector, the connecting member can be removed and the internal combustion engine can be operated with the energizing connector connected. The injector can be reliably prevented, and the injector is non-rotatably positioned at a predetermined rotation position by the connecting member that is non-rotatably engaged with the injector connection socket in the fuel delivery pipe. Therefore, it is possible to omit the provision of the rotation-preventing protrusion on the injector connection socket, and to simplify the shape and weight of the fuel delivery pipe.

JP 2007-107420 A

  However, according to the configuration of the prior art, after the leakage test at each connection portion is performed while rotating the injector around its axis, the rotating position of the injector is connected to the current-carrying connector. It is necessary to align with the predetermined rotation phase that can be performed, and the alignment of the rotation phase after this leakage test must be done manually by visual inspection. However, there was a problem that workability was low.

  It is a technical object of the present invention to provide an injector connection device that solves this problem.

In order to achieve this technical problem, the present invention
“In the connecting part between the injector and the injector connection socket in the fuel delivery pipe, a connecting member that is U-shaped when viewed from the axial direction, and the left and right side plates of the connecting member are connected to the injector connecting socket. The coupling member is detachably fitted so as to be non-rotatably engaged around the axis, and the connecting member can be freely rotated around the axis to the injector connection socket of the fuel delivery pipe. The connecting member is detachably connected to the injector, and the connecting member is fitted from the side of the energizing connector detachably connected to the left and right sides of the injector, while the energizing connector is attached to the injector. When connected, the base plate connecting the two side plates among the connecting members assembled at a predetermined position is contacted. The connecting device of the injector formed by the structure in which the current supply connector are close or Setto to block about an axis of rotation of the injector,
When the injector is turned to a connectable turning position between the injector and the connecting member, the injector is prevented from turning beyond the connectable turning position. Stopper means configured to prevent rotation in the reverse direction was provided. "
It is characterized by that.

  According to this configuration, after performing a leakage test at each connection portion of the injector while rotating the injector around its axis, the injector is set to a position where the injector is rotated to a state where rotation is prevented by the stopper means. .

  As a result, the injector can be accurately aligned with a predetermined rotational phase to which the energizing connector can be connected, so that the assembly work can be simplified compared to the visual alignment as in the prior art. , Workability can be improved, and cost can be reduced.

It is a partially cutaway front view showing an embodiment of the present invention. FIG. 2 is a sectional view taken along line II-II in FIG. 1. FIG. 3 is an exploded view of FIG. 2. FIG. 4 is a sectional view taken along line IV-IV in FIG. 1. It is a VV sectional view taken on the line of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  In these drawings, reference numeral 1 denotes an injector for injecting and supplying fuel to each cylinder in the internal combustion engine.

  The nozzle portion 1a at the lower end of the injector 1 is detachably inserted into a cylinder head 3 of an internal combustion engine or an injector loading hole 3a in an intake manifold with a sealing elastic ring 2 fitted thereto. It is connected.

  Further, the fuel inlet 1b at the upper end of the injector 1 is for an injector provided integrally with a fuel delivery pipe 5 attached to the cylinder head 3 or the intake manifold with a sealing elastic ring 4 fitted thereto. The connection socket 6 is connected by being detachably inserted therein.

  Further, on one side surface of the injector 1, a wiring connection receiving connector 1c, which is detachably connected to an energizing connector 8 connected to a control circuit device (not shown), has its axis line as the axis line 1d in the injector 1. Are integrally provided so as to be inclined obliquely upward.

  Reference numeral 9 denotes a connecting member which is a metal plate having elasticity and is formed in a U-shape when viewed from the direction of the axis 1d of the injector 1, and this connecting member 9 includes left and right side plates 9a, 9b, It is comprised by the base end plate 9c which connects the mutual integrally.

  The connecting member 9 is provided on the outside of the injector connection socket 6 in the fuel delivery pipe 5 and on the right and left sides of the injector 1 as shown by arrows A in FIGS. From the connector 1c side, left and right side plates 9a, 9b of the connecting member 9 are detachably fitted so as to come into contact with the outer peripheral surface of the injector connection socket 6.

  As shown in FIG. 4, the connecting member 9 has projections 12 and 13 protruding integrally from the injector connection socket 6 in the engaging holes 10 and 11 formed in the left and right side plates 9a and 9b. By freely fitting and engaging, it is engaged with the injector connection socket 6 in a non-rotatable manner.

  Furthermore, the connecting member 9 is integrally provided with engaging pieces 14 and 15 which are bent inwardly on the left and right side plates 9a and 9b. The engaging pieces 14 and 15 are integrally provided with the injector 1. The injector 1 is connected to the injector by the connecting member 9 by being rotatably fitted and engaged with sliding grooves 16 and 17 extending in the direction perpendicular to the axis on the left and right sides of the outer peripheral surface of the connector. The socket 6 is configured to be detachably connected to the socket 1 so that the socket 1 can be freely rotated around the axis 1d.

  When the energizing connector 8 is inserted and connected to the wiring connection receiving connector 1c in the injector 1, the energizing connector 8 is connected in the direction of the axis 1d in the injector 1 as shown by a two-dot chain line in FIG. When viewed from the side, the base plate 9c that connects the left and right side plates 9a, 9b in the connecting member 9 is close to or in contact with the base plate 9c so as to prevent the injector 1 from rotating about its axis. It is configured to do.

  In addition, the rotational phase when at least one of the engaging pieces 14 and 15 of the connecting member 9 is viewed from the direction of the axis 1d of the injector 1 is shown in FIG. When the energizing connector 8 is in a position where the energizing connector 8 can be inserted and connected to the wiring connection receiving connector 1c as indicated by a chain line, the one engagement piece 14 contacts the terminal end 16a of the sliding groove 16. Thus, the injector 1 is configured to prevent the injector 1 from rotating in the direction of the arrow B beyond the connectable rotation phase and not to prevent the rotation in the reverse direction indicated by the arrow C.

  In other words, the wire connection receiving connector 1c in the injector 1 is connected to the energization as shown by a two-dot chain line in FIG. 2 by the one engagement piece 14 and the terminal end 16a of the sliding groove 16 into which the engagement piece 14 is fitted and engaged. When the connector 8 is in the connectable rotation position, the injector 1 is prevented from rotating in the direction B beyond the connectable rotation position, but is not blocked in the opposite direction C. The stopper means 18 is configured to be freely rotatable.

  In other embodiments, the stopper means 18 can be configured other than shown.

  In this configuration, the injector 1 can be rotated in the direction of the arrow C or B in a state in which the wiring connection receiving connector 1c is oriented in the direction of the base end plate 9c of the connecting member 9. The leakage test at the insertion connection portion of the injector 1 to the injector loading hole 3a of the cylinder head 3 or the intake manifold and the injector delivery socket 6 of the fuel delivery pipe 5 can be performed while rotating the injector 1 about its axis. it can.

  When this leakage test is completed, the injector 1 is rotated in the direction of the arrow B, and the injector 1 is prevented from rotating in the direction of the arrow B by the stopper means 18. 1 is accurately aligned with the rotational phase in which the energizing connector 8 can be inserted and connected to the wire connection receiving connector 1c.

  Therefore, by inserting and connecting the energizing connector 8 to the wiring connection receiving connector 1c in the injector 1, the energizing connector 8 is connected to the base end plate 9c connecting the side plates 9a and 9b in the connecting member 9. , The injector 1 can be positioned in a non-rotatable position at a predetermined rotation position.

  As a result, the insertion connection of the energizing connector 8 to the wire connection receiving connector 1c in the injector 1 becomes possible when the connecting member 9 is completely assembled at a predetermined position, while the connecting member 9 Since the energizing connector 8 is not pulled out from the wiring connection receiving connector 1c in the injector 1, it cannot be removed.

  In the illustrated embodiment, the projecting pieces 12 and 13 projecting integrally from the injector connection socket 6 are attached to and detached from the engaging holes 10 and 11 formed in the side plates 9a and 9b of the connecting member 9. Although it was a case where the connecting member 9 was configured to engage with the injector connection socket 6 in a non-rotatable manner by freely fitting and engaging, both side plates 9a and 9b of the connecting member 9 were used. A projection piece is provided integrally with the connector connection member 9, and the projection member is detachably fitted in and engaged with a hole or recess provided in the injector connection socket 6, thereby connecting the connecting member 9 to the injector connection socket 6. On the other hand, it can be configured to engage non-rotatably.

  In the illustrated embodiment, the engaging pieces 14 and 15 provided integrally with the side plates 9a and 9b of the connecting member 9 are rotatably fitted in the annular groove 16 provided on the outer peripheral surface of the injector 1. By engaging in engagement, the injector 1 is detachably coupled to the injector connection socket 6 so as not to be detached under a state in which the injector 1 can freely rotate around the axis 1d of the injector 1. In the configuration, long side groove type engagement holes are formed in both side plates 9a and 9b of the connecting member 9, and projections provided integrally with the outer peripheral surface of the injector 1 in the engagement holes. The injector 1 can be freely rotated around the axis 1d of the injector 1 with respect to the injector connection socket 6 by fitting and engaging with each other. Originally, it is detachably connected so that it cannot be removed, and at one end of the long groove type engagement hole, the injector is prevented from rotating in a direction beyond the connectable rotation position but is rotated in the reverse direction. It can be configured not to block movement.

  Furthermore, in the illustrated embodiment, the fuel inlet 1b in the injector 1 is detachably inserted and connected to the inside 7 of the injector connection socket 6 in the fuel delivery pipe 5. Needless to say, the connection socket 6 may be configured to be detachably inserted and connected to the inside of the fuel inlet portion 1 b of the injector 1.

DESCRIPTION OF SYMBOLS 1 Injector 1c Receiving connector for wiring connection in injector 1d Axle axis 3 Cylinder head 3a Injector loading hole 5 Fuel delivery pipe 6 Injector connection socket in fuel delivery pipe 8 Electrical connector 9 Connecting member 9a, 9b Side plate of connecting member 9c Base end plate of connecting member 14,15 Engagement piece 16,17 Sliding groove 18 Stopper means

Claims (1)

A connecting member that is U-shaped when viewed from the axial direction is inserted into the connecting portion between the injector and the injector connecting socket in the fuel delivery pipe, and the left and right side plates of the connecting member are connected to the injector connecting socket in the axis line. Removably fitted so as to be non-rotatably engaged around, and by this connecting member, the injector can be freely rotated around its axis to the injector connection socket of the fuel delivery pipe. The connecting member is detachably connected to the injector, and the connecting member is fitted from the side of the energizing connector detachably connected to the left and right sides of the injector, while the energizing connector is connected to the injector. The base plate connecting the two side plates among the connecting members assembled at a predetermined position. The connecting device injector connector electricity is made in the structure adjacent or Setto to block about an axis of rotation of the injector,
When the injector is turned to a connectable turning position between the injector and the connecting member, the injector is prevented from turning beyond the connectable turning position. An injector connection device for an internal combustion engine, comprising stopper means configured to prevent rotation in the reverse direction.

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