JP2011196261A - Mounting structure of fuel injection valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple mounting structure of a fuel injection valve, sufficiently securing a distance between a positioning means and the central axis of a fuel injection valve and effectively increasing the positioning accuracy and positioning strength of the positioning means.SOLUTION: A power receiving coupler 13, which radially projects from the outer periphery of an electromagnetic operation cylinder 6 lying in the middle of the fuel injection valve I, is provided with an exposed part 13a exposed from a power supply coupler 15 fitted onto the outer periphery of the power receiving coupler 13. The positioning means 10 is composed of the exposed part 13a and a pair of pinching claws 27, 27 which are formed integrally with a fuel supply cap 21 so as to pinch the exposed part 13a and prevent rotation of the fuel injection valve I around the central axis Y.

Description

  According to the present invention, the nozzle cylinder portion at the front end portion of the fuel injection valve is fitted into the mounting hole of the engine, and is provided on the outer periphery of the fuel inlet cylinder portion at the rear end portion of the fuel injection valve on the holding member supported by the engine. The present invention relates to an improvement in a fuel injection valve mounting structure that includes a positioning means for fitting a fuel supply cap and defining a predetermined position around a central axis of the fuel injection valve.

  Such a fuel injection valve mounting structure is known, for example, as disclosed in Patent Document 1 below.

Japanese Utility Model Publication No. 60-173675

  In the fuel injection valve mounting structure disclosed in Patent Document 1, the positioning means includes a pair of parallel flat surfaces formed on both side surfaces of the intermediate portion of the fuel injection valve, and a fuel supply for contacting the flat surfaces. It is comprised with a pair of clamping piece formed in the cap.

  By the way, the positioning means for defining a predetermined position around the axis of the fuel injection valve is for specifying the direction of the power receiving coupler in a fixed direction or for specifying the fuel injection direction of the fuel injection valve. Where positioning accuracy is required, the distance between the positioning means and the central axis of the fuel injection valve is less than or equal to the radius of the fuel injection valve in the conventional structure described above, and the positioning accuracy of the positioning means is sufficient. It is difficult to increase, and it is disadvantageous in terms of positioning strength of the positioning means.

  The present invention has been made in view of such circumstances, and can sufficiently secure the distance between the positioning means and the central axis of the fuel injection valve, and effectively increase the positioning accuracy and positioning strength of the positioning means. It is an object of the present invention to provide a simple fuel injection valve mounting structure.

  In order to achieve the above-mentioned object, the present invention has a fuel injection cylinder portion at the front end portion of the fuel injection valve fitted into the mounting hole of the engine, and an outer periphery of the fuel inlet cylinder portion at the rear end portion of the fuel injection valve. In a fuel injection valve mounting structure, a fuel supply cap provided on a holding member supported by an engine is fitted and positioning means for defining a predetermined position around the central axis of the fuel injection valve is provided. A power receiving coupler protruding radially from the outer periphery of the electromagnetically actuated cylinder portion located in the middle portion of the valve is provided with an exposed portion exposed from the power feeding coupler fitted to the outer periphery of the power receiving coupler. A first feature is that the positioning means is constituted by a pair of clamping claws formed integrally with the fuel supply cap so as to prevent rotation of the fuel injection valve around the axis with the portion interposed therebetween.

  Further, according to the present invention, in addition to the first feature, the power receiving coupler is inclined to a side of the fuel inlet cylinder from a coupler base protruding from the outer peripheral surface of the electromagnetic operating cylinder at a substantially right angle, and a tip of the base. The second is that a pair of pinching claws are arranged so as to sandwich the power supply coupler with the coupler base portion as the exposed portion and projecting in the radial direction and having the feeding coupler fitted on the outer periphery. It is characterized by.

  Furthermore, in addition to the second feature, the present invention has a third feature that a recess is formed between the pair of nail claws to receive the tip of the power feeding coupler near the fuel injection valve.

  According to the first feature of the present invention, the power receiving coupler protruding in the radial direction from the outer periphery of the relatively large-diameter electromagnetically actuated cylinder portion is used as the positioning means. That is, since the positioning means is constituted by the exposed portion of the power receiving coupler from the power feeding coupler and the pair of pinching claws formed on the fuel supply cap so as to sandwich the exposed portion, the contact point between the pinching claws and the coupler base is The distance from the central axis of the fuel injection valve is greater than or equal to the radius of the electromagnetically actuated cylinder, thereby increasing the positioning accuracy and positioning strength of the positioning means relative to the fuel injection valve. In addition, since the power receiving coupler is used as a mating member that constitutes the positioning means in cooperation with the pinching claw, it is not necessary to attach a special positioning member on the fuel injection valve side, and the structure can be simplified.

  According to the second feature of the present invention, the power receiving coupler includes a coupler base portion protruding substantially perpendicularly from the outer peripheral surface of the electromagnetically actuated cylinder portion, and a radius inclined from the tip of the base portion toward the fuel inlet cylinder portion of the fuel injection valve. The base of the power supply coupler is fitted to the outer periphery of the fuel inlet cylinder so that the base of the power supply coupler is connected to the coupler body of the power supply coupler. The attachment / detachment operation can be easily performed, and the interference between the nail and the coupler body can be easily avoided.

  According to the third feature of the present invention, a pinion claw is formed between the pair of pinch claws to receive a tip portion near the fuel injection valve of the power feeding coupler fitted to the outer periphery of the coupler barrel. In order to reduce the size of the fuel injection valve, it is possible to secure a sufficient depth of fitting between the coupler body and the power feed coupler without being interfered with, and to make the power feed coupler as close as possible to the electromagnetic actuating cylinder. it can.

The top view which shows the state which attached the fuel injection valve to the engine with the attachment structure of this invention. FIG. 2 is a sectional view taken along line 2-2 in FIG. 1. FIG. 3 is a perspective view around the positioning means of FIG. 2.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 and 2, mounting holes 2 are provided in a plurality of (two in the illustrated example) intake pipes 1 including a throttle body of a multi-cylinder engine, and an outer end opening of each of the mounting holes 2 is formed in an annular recess 2a. It is formed.

  On the other hand, an electromagnetic fuel injection valve (hereinafter simply referred to as a fuel injection valve) I attached to the intake pipe 1 is a solenoid cylinder having a diameter larger than that of the nozzle cylinder 5 at the front end and the nozzle cylinder 5 at the middle. The fuel inlet cylinder part 7 having a diameter smaller than that of the electromagnetically actuated cylinder part 6 is provided at the rear end part of the parts 6 and is substantially cylindrical. A seal member 4 is mounted on the outer periphery of the base of the nozzle tube portion 5, and a seal member 9 is mounted on a seal groove 8 formed on the outer periphery of the fuel inlet tube portion 7. Are fitted into the mounting hole 2 and the annular recess 2a, respectively. The fuel supply cap 21 of the holding member R supported by the intake pipe 1 is fitted to the fuel inlet cylinder portion 7 in order to hold the fuel injection valve I in the fitted state and supply fuel to the fuel injection valve I. At that time, the seal member 9 is in close contact with the inner peripheral surface of the fuel supply cap 21 to seal between the fuel inlet cylinder 7 and the fuel supply cap 21. Between the fuel injection valve I and the fuel supply cap 21, there is provided positioning means 10 for defining a predetermined position around the central axis Y of the fuel injection valve I, which will be described later.

  Thus, when the fuel injection valve I is energized to the coil 6 a of the electromagnetically actuated cylinder portion 6, the needle valve 5 a in the nozzle cylinder portion 5 is opened and the fuel supply cap 21 moves to the fuel inlet cylinder portion 7. The introduced fuel can be injected into the intake pipe 1 from the fuel injection hole of the nozzle cylinder portion 5.

  The outer peripheral wall of the electromagnetically actuated cylinder portion 6 is composed of a synthetic resin coating layer 12 molded so as to embed the coil 6 a, and the power receiving coupler 13 is connected to the outer periphery of the electromagnetically actuated cylinder portion 6 on this coating layer 12. Are integrally molded so as to protrude in the radial direction. The power receiving coupler 13 includes a transverse rectangular coupler base portion 13a that protrudes substantially perpendicularly in the radial direction from the outer peripheral surface of the electromagnetically actuated cylinder portion 6, and an oblique radial direction from the tip of the coupler base portion 13a toward the fuel inlet cylinder portion 7 side. A coupler body 13b having a box-shaped cross section projecting into the coil 9 and a current-carrying terminal 14 connected to the coil 9 is disposed on the coupler body 13b. A power feeding coupler 15 for feeding power to the energizing terminal 14 is fitted on the outer periphery of the coupler body 13b. Therefore, the coupler base portion 13 a becomes an exposed portion exposed from the power feeding coupler 15.

  The holding member R is made of synthetic resin and has a fuel distribution pipe 20 and a cylindrical fuel supply cap 21 that protrudes integrally with one side of the fuel distribution pipe 20 corresponding to each fuel injection valve I. And a support arm 22 that protrudes integrally on one side of the fuel supply cap 21 or the fuel distribution pipe 20. A fuel filter 29 is attached to an inlet 20a provided at one end of the fuel distribution pipe 20, and a fuel conduit 23 for guiding high-pressure fuel from a fuel pump (not shown) is connected.

  The support arm 22 is fixed to the intake pipe 1 by screwing and tightening a bolt 25 inserted into the bolt hole 24 to a mounting boss 26 formed at a predetermined position of the intake pipe 1. Thus, the holding member R is supported by the intake pipe 1.

  Now, the positioning means 10 for holding the fuel injection valve I held between the intake pipe 1 and the fuel supply cap 21 at a predetermined position around the central axis Y will be described with reference to FIGS.

  The positioning means 10 rotates around the central axis Y of the fuel injection valve I with the coupler base portion 13a exposed from the power supply coupler 15 of the power receiving coupler 13 and the coupler base portion 13a sandwiched at the predetermined position of the fuel injection valve I. It is comprised with a pair of nail | claw claws 27 and 27 formed in the fuel supply cap 21 integrally. A recess 28 is formed between the nail claws 27 and 27 to receive the tip of the power feeding coupler 15 that is fitted to the outer periphery of the coupler body 13b, close to the fuel injection valve I.

  Next, the operation of this embodiment will be described.

  In attaching the fuel injection valve I to the intake pipe 1, first, the nozzle cylinder portion 5 of the fuel injection valve I is fitted into the attachment hole 2 of the intake pipe 1, and the seal member 4 is attached to the front end of the electromagnetic operation cylinder portion 6. It is pushed into the annular recess 2a to seal around the nozzle tube portion 5.

  Next, the coupler base portion 13a of the fuel injection valve I is sandwiched between the pair of clamping claws 27 and 27 while the fuel supply cap 21 of the holding member R is fitted to the outer periphery of the fuel inlet cylinder portion 7 of the fuel injection valve I. To do. Then, the bolt hole 24 of the support arm 22 of the holding member R is aligned with the screw hole of the mounting boss 26 of the intake pipe 1, and the bolt 25 inserted through the bolt hole 24 is screwed and tightened to the mounting boss 26. Thereafter, the feed coupler 15 is fitted to the outer periphery of the coupler body 13 b of the power receiving coupler 13.

  Thus, the fuel supply cap 21 of the holding member R is fixed at a fixed position of the intake pipe 1, and the pair of nail claws 27, 27 formed on the fuel supply cap 21 is a coupler of the power receiving coupler 13 exposed from the power feeding coupler 15. By sandwiching the base portion 13a, the fuel injection valve I is prevented from rotating around its central axis Y and is held at a predetermined position, whereby the direction of the power receiving coupler 13 and the direction of fuel injection from the nozzle tube portion 5 are constant. Can be specified.

  By the way, the coupler base portion 13a sandwiched between the pair of sandwiching claws 27, 27 protrudes in the radial direction from the outer periphery of the electromagnetically actuated cylinder portion 6 having the maximum diameter in the fuel injection valve I, so that the sandwiching claws 27, 27 and the coupler base portion 13a This contact is separated from the central axis Y of the fuel injection valve I beyond the radius of the electromagnetically actuated cylinder portion 6, and as a result, the positioning accuracy and the positioning strength of the positioning means 10 with respect to the fuel injection valve I can be increased.

  Moreover, since the power receiving coupler 13 is used as a mating member constituting the positioning means 10 in cooperation with the pinching claws 27, 27, it is not necessary to attach a special positioning member on the fuel injection valve I side, and the structure can be simplified. Can do.

  Further, the power receiving coupler 13 is protruded from the outer peripheral surface of the electromagnetically actuated cylinder portion 6 at a substantially right angle, and the tip of the coupler base portion 13a is inclined toward the fuel inlet cylinder portion 7 in the radial direction, and the outer periphery of the power receiving coupler 13 Since the coupler base portion 13a is sandwiched between the pinching claws 27 and 27, the coupler barrel portion of the power supply coupler 15 around the fuel inlet cylinder portion 7 is formed. The attaching / detaching operation to the portion 13b can be easily performed, and the interference between the nail claws 27 and 27 and the coupler barrel portion 13b can be easily avoided.

  Further, between the pair of nail claws 27, 27, a recess 28 for receiving the tip of the power feeding coupler 15 fitted to the outer periphery of the coupler body 13b is formed, so that the nail claws 27, 27 interfere with each other. In addition, a sufficient fitting depth between the coupler body 13b and the power feeding coupler 15 can be ensured, and the power feeding coupler 15 can be made as close as possible to the electromagnetic actuating cylinder portion 6 so that the fuel injection valve I can be made compact. it can.

  As mentioned above, although the Example of this invention was described, this invention is not limited to it, A various design change is possible in the range which does not deviate from the summary. For example, the present invention can be applied to a single cylinder engine.

I ... Fuel injection valve R ... Holding member Y ... Fuel injection valve central axis 2 ... Mounting hole 5 ... Nozzle tube 6 ... ..Electromagnetically actuated cylinder 7 ... Fuel inlet cylinder 10 ... Positioning means 13 ... Power receiving coupler 13a ... Exposed part (coupler base)
13b ... coupler body 15 ... feed coupler 21 ... fuel supply cap

Claims (3)

The nozzle cylinder (5) at the front end of the fuel injection valve (I) is fitted into the mounting hole (2) of the engine and the outer periphery of the fuel inlet cylinder (7) at the rear end of the fuel injection valve (I). The fuel supply cap (21) provided on the holding member (R) supported by the engine is fitted to the positioning means for defining a predetermined position around the central axis (Y) of the fuel injection valve (I). (10) A fuel injection valve mounting structure comprising:
A power feeding coupler (13) fitted to the outer periphery of the power receiving coupler (13) is connected to the power receiving coupler (13) projecting in the radial direction from the outer periphery of the electromagnetically actuated cylinder portion (6) positioned at the intermediate portion of the fuel injection valve (I). 15) An exposed portion (13a) exposed from 15) is provided, and the rotation of the fuel injection valve (I) around the axis (Y) is prevented by sandwiching the exposed portion (13a) and the exposed portion (13a). The fuel injection valve mounting structure is characterized in that the positioning means (10) is constituted by a pair of pinching claws (27, 27) formed integrally with the fuel supply cap (21). The fuel injection valve mounting structure according to claim 1,
The power receiving coupler (13) has a coupler base (13a) projecting substantially perpendicularly from the outer peripheral surface of the electromagnetic actuating cylinder (6), and a tip of the base (13a) toward the fuel inlet cylinder (7). The coupler body part (13b) is inclined and protrudes in the radial direction, and the power feeding coupler (15) is fitted to the outer periphery. The coupler base part (13a) is used as the exposed part so as to sandwich it. A fuel injection valve mounting structure, wherein a pair of pinching claws (27, 27) are arranged. The fuel injection valve mounting structure according to claim 2,
A fuel injection valve characterized in that a recess (28) is formed between the pair of nail claws (27, 27) for receiving the tip of the power supply coupler (15) near the fuel injection valve (I). Mounting structure.

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