JP5387503B2 - Injector mounting structure - Google Patents

Description

  The present invention relates to an injector mounting structure in which an injector for supplying fuel to an internal combustion engine is fixed to the internal combustion engine with a bolt via a bracket.

  Conventionally, in a diesel engine, fuel from a high-pressure fuel injection pump is sent to a common rail (pressure accumulator), and fuel is injected from the common tray via injectors provided in each cylinder. Further, as a structure for attaching the injector to the engine body, a structure in which the injector is attached to a predetermined position of the cylinder through the cylinder head cover and fixed from the outside of the cylinder head cover via a clamp member or the like is employed.

For example, in Patent Document 1 (Japanese Patent Laid-Open No. 2009-150317), as shown in FIG. 6, a cylinder head cover 02 is fixed to the cylinder head 01, and an insertion hole 03 is formed on the upper surface of the cylinder head cover 02 in the number of cylinders. It is provided accordingly.
An injector 04 is inserted into each insertion hole 03, and the injector 04 is held by the cylinder head 01 with its tip facing a combustion chamber (not shown). The upper portions of the injectors 04 are respectively held by support metal fittings 05, and the support metal fittings 05 are attached to the cylinder head 01 from the outside (upper surface side) via two bolts 06. Then, two bolts 06 are screwed into the cylinder head 01 through the cylinder head cover 02, whereby each injector 04 is fixed to the cylinder head 01 in a state of extending in the vertical direction. Such a structure is shown in Patent Document 1.

JP 2009-150317 A (FIG. 4)

  The attachment structure of the injector 04 shown in Patent Document 1 is a structure in which the upper portion of the injector 04 is held by the support fitting 05 and the support fitting 05 is attached to the cylinder head 01 by two bolts 06 as described above.

  Support metal fittings such as Patent Document 1 are often manufactured by sintering or casting in consideration of strength and the like, and have a problem of increasing the weight of the support metal fittings. In addition, there is a problem of an increase in cost in responding to a design change accompanying a change in shape of the support metal fitting. Furthermore, since there are many other parts such as fuel pipes and valve mechanisms around the cylinder head, it is necessary to provide an injector mounting structure that is lightweight and compact and has sufficient rigidity to hold the injector without taking up more space. Has been.

  Accordingly, the present invention has been made in view of these problems. The injector that supports the injector to the internal combustion engine is made lightweight and compact, and the strength of the bracket is ensured to enable stable attachment of the injector. An object of the present invention is to provide a mounting structure.

In order to solve the above-mentioned problems, an injector mounting structure according to the present invention is an injector mounting structure in which an injector for supplying fuel to an internal combustion engine is fixed to the internal combustion engine with a bolt via a bracket. An internal combustion engine formed by a member and having a base having an injector through-hole through which the injector passes, and a bolt through-hole through which the bolt passes, and sandwiching the injector through-hole and the bolt through-hole from an edge of the base And a wall portion that forms a part of the edge portion of the injector through-hole and extends the side of the wall portion that forms a part of the edge portion of the injector through-hole. out, with an abutment portion abutting on the injector said extension end portion, said base portion forming a bottom portion of said bracket, Inge The wall is separated into bases on both sides through which the bolt penetrates by a through-hole, and the bases on both sides are connected only by the wall, and further, the wall located between the injector through-hole and the bolt through-hole The part is formed with a notch communicating with the injector through hole .

According to this invention, the wall portion is formed extending from the edge of the base portion having the injector through hole through which the injector passes and the bolt through hole through which the fixing bolt passes to the side opposite to the internal combustion engine. That is, it has a substantially U-shaped cross section that opens in the direction opposite to the internal combustion engine. And this wall part exhibits the following three functions. (1) A part of the edge of the injector through hole is formed. (2) A contact portion for pressing the injector is formed at the lower end portion of the wall portion. (3) It has a reinforcing effect that improves the rigidity of the entire bracket.
By having these three functions together, a bracket advantageous in terms of weight and cost can be configured. Even a bracket manufactured by sintering or casting can constitute a bracket advantageous in terms of weight and cost. Furthermore, by using sheet metal, the processing can be formed specifically by pressing, so that the manufacturing can be simplified, which is advantageous in terms of manufacturing cost and manufacturing man-hours.

Further, the present invention, the wall portion located between the injector through hole and the bolt through hole, notch communicating with the injector through-holes are formed.
That is, a notch is formed in the wall portion located between the injector through hole and the bolt through hole. Because of this notch, in the case of manufacturing by metal working (pressing), the base can be easily bent to form the wall by raising the edge of the base.
Also, when the fixing bolt is passed through the bolt through hole and tightened, excess stress caused by excessive tightening is absorbed by this notch, preventing deformation of the entire bracket and reducing the pressing force against the injector. Unbiased.

Preferably, in the present invention, two bolt through holes are formed so as to sandwich the injector through hole, and the wall portion is parallel to a straight line connecting the centers of the through holes of the bolt through hole and the injector through hole. It is good to form facing each other.
In this way, the wall portion is formed on both sides so as to be parallel to a straight line connecting the centers of the bolt through holes and the injector through holes, so that the wall portion can resist stress caused by bolt tightening. The effect of the reinforcing member for ensuring the rigidity of the entire bracket is obtained.

In the present invention, preferably, both ends of the opposed wall portions have a distance between both wall portions smaller than a diameter of a washer seat surface formed around the bolt through hole.
That is, since the width of both ends of the bracket is formed to be small, it is easy to avoid interference with other parts and interference with piping around the cylinder bed, which is effective in terms of layout.
In addition, since the wall portions on both sides of the bolt through hole can function as a guide for a tool (socket wrench) that engages with the bolt head, the efficiency of bolt attachment and removal work is improved.

In the present invention, it is preferable that a tip portion of the abutting portion formed on the wall portion is formed in an arc shape having one curvature radius.
In this way, the tip of the abutting portion is not a flat shape but a single arc shape, so the bolts on both sides of the bracket are unevenly tightened, and even if the bracket tilts, The abutment to the injector is ensured without the portion floating from the abutment receiving portion. Accordingly, the pressing and fixing of the injector by the abutting portion of the bracket is stabilized.

Preferably, in the present invention, the injector through hole is formed in a substantially oval shape or a substantially rectangular shape, and the size of the oval shape or the rectangular shape is a size through which a connector portion provided at the upper end portion of the injector body can pass. It is good to have.
Thus, since the connector part for inputting the operation signal of the injector sent from the control device is provided at the upper end part of the injector body, the upper end part of the injector protrudes more in the radial direction than the other parts. ing. For this reason, when mounting the bracket, after passing the connector portion as an oblong or rectangular hole, not simply a circular hole, then rotate the bracket around the central axis of the injector, The abutting portion is positioned and abutted on the abutting receiving portion formed on the injector.
Therefore, the bracket can be easily mounted at the time of assembly to the injector, and the size of the bracket can be made as small as possible without forming a large circular injector through hole.

  According to the present invention, the bracket is formed of a plate-like member and has a base portion having an injector through hole through which the injector passes, and a bolt through hole through which the bolt passes, and from the edge of the base portion to the injector through hole. A wall portion extending to the opposite side of the internal combustion engine across the bolt through hole and forming a part of an edge portion of the injector through hole, and a portion of the edge portion of the injector through hole The wall portion to be formed is extended to the internal combustion engine side, and the extending end portion is provided with an abutting portion that abuts on the injector. Therefore, the bracket for supporting the injector on the internal combustion engine is made lightweight and compact, and the bracket Ensuring strength and enabling stable installation of the injector.

It is a whole lineblock diagram showing the section of an important section showing an embodiment of the present invention. It is a whole block diagram of the principal part section which shows A direction view of FIG. It is a front view of a bracket. FIG. 4 is a plan view of the bracket, and is a view in the B direction of FIG. 3. It is a side view of a bracket and is a C direction view of FIG. It is explanatory drawing of a prior art.

  Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this embodiment are not intended to limit the scope of the present invention to that unless otherwise specified.

FIG. 1 shows an injector mounting structure according to the present invention, which is applied to an injector 1 of a fuel supply system in a common rail type diesel engine mounted on an automobile.
In FIG. 1, a cylinder head cover 5 is fixed to the cylinder head 3 with bolts 7, and an insertion hole 9 of the injector 1 is provided on the upper surface of the cylinder head cover 5 according to the number of cylinders. The injectors 1 are inserted into the respective insertion holes 9, and the fuel injection holes 11 formed at the distal ends of the injectors 1 are inserted and held in the injector mounting holes 15 formed in the cylinder head 3 so as to face the combustion chamber 13. ing.

  At the upper part of the injector 1, a bracket 17 as a support fitting that presses and fixes the injector 1 to the cylinder head 3 is held by the injector 1 corresponding to each cylinder, and the bracket 17 is outside via two bolts 19. It is attached to the cylinder head 3 from the (upper surface side). That is, by passing through the cylinder head cover 5 and screwing the two bolts 19 into the cylinder head 3, each injector 1 is fixed to the cylinder head 3 in a state of extending in the vertical direction.

  In addition, when two bolts 19 are screwed into the cylinder head 3 and the injector 1 is pressed downward by the bracket 17, a gas seal gasket interposed between the injector lower surface 21 and the cylinder head seat surface 23. 25 is pressed to seal the combustion pressure and combustion gas in the combustion chamber 13.

Although the details of the structure of the injector 1 are not shown, the outline will be described. The injector 1 constitutes a fuel injection device for a combustion chamber 13 of a diesel engine. The injector 1 is provided with a fuel pressure chamber above a needle valve, a combustion injection chamber below, and an electromagnetic valve of the injector. When is closed, the needle valve is pressed against the seat by the pressure in the fuel pressure chamber, and fuel is not injected.
When a control command is received from the controller via a signal cable from a controller connected to a connector portion 27 (see FIG. 2) provided at the upper end portion of each injector 1, the fuel pressure chamber is opened. Is released and the pressure in the fuel pressure chamber decreases. The needle valve is moved upward by the pressure in the fuel injection chamber, the injection hole is opened, and fuel is injected.
When the injector 1 receives the control command from the controller and closes the solenoid valve, the pressure in the fuel pressure chamber is restored, the needle valve moves downward, the needle valve is seated on the seat, and the fuel injection ends. . In this way, the solenoid valve is opened and closed by a signal from the controller to control the start and end of injection.

  As shown in FIG. 2, the fuel is supplied with high-pressure fuel from a common rail (not shown) or high-pressure fuel from a high-pressure fuel injection pump through a fuel pipe 29. The fuel pipe 29 is connected to the fuel inlet 31 via a flare nut 33. The return fuel is returned from the fuel return portion 35 to the fuel tank by a return pipe (not shown).

  In the main body portion of the injector where the fuel inlet portion 31 is formed, a shelf portion 41a which is a contact receiving portion with which a contact portion 55 formed on a wall portion 37 of the bracket 17 described later contacts is formed. A shelf 41 b is also formed on the opposite side of the fuel inlet 31 from the center of the injector 1.

  Next, the bracket 17 will be described with reference to FIG. 1 and FIGS.

  The bracket 17 is formed of a plate-like member, is manufactured using, for example, a chrome steel material that is excellent in heat resistance and toughness, is bent by pressing, and is processed into the cross-sectional shape of the present invention.

3 shows a front view of the bracket 17, FIG. 4 shows a plan view of the bracket 17, and FIG. 5 shows a side view of the bracket 17.
The shape of the bracket 17 is roughly divided into a base portion 43 and a wall portion 45 that is bent so as to rise from the edge of the base portion 43.
As shown in FIG. 4, the bracket 17 is formed with a substantially rectangular or substantially elliptical injector through-hole 47 long in the axial direction through which the injector 1 passes, and on both sides in the longitudinal direction of the injector through-hole 47. Two bolt through holes 49, 49 penetrating the bolt 19 are formed. That is, two bolt through holes 49 are formed so as to sandwich the injector through hole 47, and the wall portions 45, 45 are parallel to a straight line connecting the centers of the through holes of the bolt through hole 49 and the injector through hole 47. It is formed opposite to.

Accordingly, the wall portions 45 and 45 are thus formed on both sides so as to be parallel to a straight line connecting the centers of the respective through holes of the bolt through hole 49 and the injector through hole 47. It has a function as a reinforcing member that ensures the rigidity of the entire bracket 17 against stress caused by bolt tightening.
The base 43 is formed by the bottom portion of the bracket 17 having the injector through hole 47 and the bolt through holes 49 and 49.

  The washer seat surface 51 of the bolt through hole 49 has a constricted shape, and a spherical washer 53 is interposed between the washer seat surface 51 and the bolt 19. Due to the conical washer seat surface 51 and the spherical washer 53, even when the bracket 17 is inclined, the variation in the axial force of the bolt 19 is minimized.

Further, the wall portion 45 forming a part of the edge portion of the injector through hole 47 is extended from the internal combustion engine side, and a contact portion 55 that contacts the injector 1 is formed at the extended end portion. Further, the tip portion of the contact portion 55 is formed in an arc shape having one curvature radius R1.
In this way, by making the tip portion of the contact portion not a flat shape but a single arc shape, the tightening force of the bolts 19 on both sides of the bracket 17 is biased, and the bracket 17 is inclined. The contact portion 55 is reliably brought into contact with the injector 1 without being lifted from the shelf portions 41a and 41b of the contact receiving portion. Therefore, the action of the pressing force of the injector 1 by the contact portion 55 of the bracket 17 is stabilized.

  In addition, the height H of the contact part 55 is formed in the same height in each wall part 45 and 45, and shelf part 41a, 41b with which the contact part 55 contacts is also the same with respect to the full length of the injector 1. FIG. Each is formed at a position. For this reason, the bracket 17 can be mounted without being inverted. The shape of the bracket 17 is formed symmetrically with respect to the longitudinal axis and the axis perpendicular thereto.

As shown in FIG. 4, both ends of the opposed wall portions 45, 45 are arranged so that the distance W between both wall portions is smaller than the diameter D of the washer seat surface 51 formed around the bolt through hole 49. It is bent and formed.
That is, since the width of both ends of the bracket 17 is formed to be small, it is easy to avoid interference with the cylinder head components and piping around the cylinder bed, which is effective in layout.
Further, since the wall portions 45, 45 on both sides of the bolt through hole 49 can function as a guide for a tool (socket wrench) engaged with the bolt head, that is, the socket is held in a vertical state with respect to the bolt head. Therefore, the efficiency of bolt mounting and removal work is improved.

  Further, since the width of the both ends of the bracket 17 is formed so as to be small, the reinforcing action by the wall portion 45 is effective for bending around the longitudinal axis of the bracket 17 and bending around the axis perpendicular to the longitudinal axis. Therefore, the rigidity of the bracket 17 can be further improved and the bracket 17 can be further reduced in weight and size as compared with the case of a wall portion that extends linearly over the entire length without reducing the width of both ends of the bracket 17.

Furthermore, a notch portion 57 that communicates with the injector through hole 47 is formed in the wall portion 45 of the bracket 17 at a portion located between the injector through hole 47 and the bolt through hole 49. As shown in FIG. 3, the notch 57 has a radius of curvature of R2 and is notched so as to avoid stress concentration.
With this cutout portion 57, it is possible to easily perform the processing of raising the edge of the base portion 43 and forming the wall portion 45 with respect to the base portion 43 when bending by metal processing (press processing).
Further, when the bolt 19 is passed through the bolt through hole 49 and tightened, excessive stress generated by excessive tightening is absorbed by the notch portion 57 to prevent deformation of the bracket 17 as a whole. The bias of the pressing force against can be eliminated.

  Further, the injector through-hole 47 described above is formed in a substantially oval shape or a substantially rectangular shape, and this size is such that the connector portion 27 provided at the upper end portion of the injector 1 is indicated by a chain line in FIG. Therefore, when the bracket 17 is assembled to the injector 1, the bracket can be easily mounted, and the size of the bracket 17 can be reduced without forming a large circular injector through hole 47. Can be made as small as possible.

Next, the procedure for assembling the bracket will be described.
First, the fuel injection hole 11 formed at the tip of the injector 1 is inserted into the injector mounting hole 15 formed in the cylinder head 3 with the fuel injection hole 11 facing the combustion chamber 13. Then, the bracket 17 is inserted from above the injector 1. In that case, it inserts in the direction which can pass the connector part 27 of the injector 1 in the injector through-hole 47 (refer FIG. 4). Thereafter, the direction of the bracket 17 is rotated by approximately 90 °, and the contact portion 55 formed on the wall portion 45 is applied to the shelf portions 41a and 41b formed on the injector side.

Thereafter, the bolts 19 and 19 are inserted into the bolt through holes 49 and 49, respectively, and the bolt 19 is tightened, and the injector 1 is moved downward through the contact portion 55 of the bracket 17 and the shelf portions 41a and 41b of the injector 1. The gas seal gasket 25 interposed between the injector lower surface 21 and the cylinder head seat surface 23 is pressed to seal the combustion pressure and combustion gas in the combustion chamber 13.
Thereafter, a fuel pipe 29 and a return pipe (not shown) are connected to the fuel inlet portion 31 and the fuel return portion 35 of the injector 1. The above assembly procedure is performed for the injectors for all cylinders.

  According to the mounting structure of the injector 1 described above, it extends from the edge of the base 43 having the injector through hole 47 through which the injector 1 passes and the bolt through hole 49 through which the fixing bolt passes through to the side opposite to the internal combustion engine. A wall portion 45 is formed. That is, it has a substantially U-shaped cross section that opens in the direction opposite to the internal combustion engine. And this wall part 45 exhibits the following three functions. (1) A part of the edge of the injector through hole 47 is formed. (2) A contact portion 55 for pressing the injector 1 is formed at the lower end portion of the wall portion 45 that forms a part of the edge portion of the injector through hole 47. (3) It has a reinforcing effect that improves the rigidity of the entire bracket 17.

  By having these three functions together, a bracket advantageous in terms of weight and cost can be configured. In the above-described embodiment, the bracket is manufactured by pressing a sheet metal. However, a bracket manufactured by sintering, casting, or the like can constitute a bracket that is advantageous in terms of weight and cost. Furthermore, since the bracket can be made of sheet metal, the processing can be specifically formed by press processing, so that the manufacturing can be simplified, which is advantageous in terms of manufacturing cost and manufacturing man-hours.

  According to the present invention, the bracket for supporting the injector on the internal combustion engine can be made light and compact, and the strength of the bracket can be secured to enable stable installation of the injector, which is suitable for use in an injector mounting structure. ing.

DESCRIPTION OF SYMBOLS 1 Injector 3 Cylinder head 5 Cylinder head cover 11 Fuel injection hole 13 Combustion chamber 17 Bracket 19, 7 Bolt 21 Injector lower surface 23 Cylinder head seat surface 25 Gas seal gasket 41a, 41b Shelves 43 Base 45 Wall 47 Injector through hole 49 Bolt penetration Hole 51 Washer seat surface 53 Spherical washer 55 Abutment portion 57 Notch

Claims (5)

In the injector mounting structure for fixing an injector for supplying fuel to the internal combustion engine with a bolt to the internal combustion engine via a bracket,
The bracket is formed of a plate-like member, and has a base portion having an injector through hole through which the injector passes and a bolt through hole through which the bolt passes,
A wall portion extending from the edge portion of the base portion to the opposite side of the internal combustion engine across the injector through hole and the bolt through hole and forming a part of the edge portion of the injector through hole;
Extending the internal combustion engine side of the wall portion forming a part of the edge of the injector through-hole, and provided with a contact portion that contacts the injector at the extended end portion ;
The base that forms the bottom portion of the bracket is separated into bases on both sides through which the bolt passes by an injector through hole, and is formed so that the bases on both sides are connected only by the wall, and the injector through hole An injector mounting structure characterized in that a notch portion communicating with the injector through hole is formed in the wall portion positioned between the bolt through hole and the bolt through hole . Two bolt through holes are formed so as to sandwich the injector through hole, and the wall portion is formed so as to be parallel to a straight line connecting the centers of the through holes of the bolt through hole and the injector through hole. The injector mounting structure according to claim 1, wherein: 3. The injector according to claim 2, wherein both ends of the facing wall portions are bent inward so that a distance between both wall portions is smaller than a diameter of a washer seat surface formed around the bolt through hole. Mounting structure. The injector mounting structure according to any one of claims 1 to 3, wherein a tip portion of the abutting portion formed on the wall portion is formed in an arc shape having a single radius of curvature . The injector through hole is formed in a substantially oval shape or a substantially rectangular shape, and the size of the oval shape or the rectangular shape is such that a connector portion provided at the upper end portion of the injector body can pass therethrough. The injector mounting structure according to any one of claims 1 to 4, wherein the injector mounting structure is characterized in that:

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