JP6141718B2 - High pressure fuel delivery pipe for direct injection engines - Google Patents

Description

  The present invention relates to a high-pressure fuel delivery pipe for use in a direct injection engine that directly injects fuel into a combustion chamber of the engine, and more particularly, to a structure for connecting an injection valve socket for holding a fuel injection valve to a fuel passage pipe body. .

  In an automobile engine composed of a multi-cylinder internal combustion engine, in the case of a direct injection engine that directly injects fuel into a combustion chamber, a delivery pipe is provided to supply fuel to the combustion chamber of each cylinder of the engine at a high pressure. The delivery pipe includes a fuel passage pipe body to which pressurized fuel is supplied from a high pressure fuel pump, and a fuel injection valve fixed to the fuel passage pipe body and controlled to be opened and closed by a control unit. A plurality of injection valve sockets formed with socket holes that communicate with and hold, and a plurality of mounting bosses that are fixedly attached to the fuel passage pipe body and formed with mounting holes for mounting on the engine. ing.

  In general, in a direct injection engine, a delivery pipe has a fuel passage pipe body disposed above each cylinder of the engine with its axial direction oriented horizontally, and at each of a plurality of locations of the fuel passage pipe body. One injection valve socket and one mounting boss are fixedly attached to the fuel passage tube main body in the vertical direction with the axial direction of the socket hole and the mounting hole being perpendicular to the axial direction of the fuel passage tube main body. ing.

  An example of this type of high-pressure fuel delivery pipe for a direct injection engine is disclosed in Patent Document 1 (US Publication No. 2009/0145504). This delivery pipe is provided with a recess for fixing an injection valve socket and a fixing boss at each of a plurality of locations of an elongated cylindrical fuel passage tube body arranged in a horizontal direction, with an axis line extending from the outer periphery of the fuel passage tube body. A cylindrical injection valve socket and a mounting boss, each of which is cut into a vertical cylindrical surface and whose axis is in the vertical direction, are brazed.

US Published Patent No. 2009/0145504

  However, in such a conventional technique, it is necessary to cut the cylindrical surface-shaped recesses individually from the outer periphery of the fuel passage pipe body, which takes time and labor for the processing, and the individual injection valve sockets and mounting bosses. The fixing strength depends on the state of fixing to the fuel passage pipe body as each component alone, and it is desired to improve in terms of productivity and reliability. In addition, a structure in which the fixed portion is less likely to corrode with the passage of use is desired.

  An object of the present invention is to achieve such an improvement over the prior art, and it is an object of the present invention to reduce the labor of manufacturing and secure sufficient fixing strength of individual injection valve sockets and mounting bosses.

In order to achieve the above object, the present invention provides a fuel passage pipe body to which pressurized fuel is supplied from a high-pressure fuel pump, and a plurality of points fixed in the axial direction of the fuel passage pipe body. Each of the injection valve sockets and one mounting boss fixed to each of the same sockets. The injection valve socket includes a fuel injection valve that is controlled to be opened and closed by a control unit. A socket hole for communicating and holding is formed, and a mounting boss is formed with a mounting hole for mounting to the engine, a high pressure fuel delivery pipe for a direct injection engine, disposed toward the axial horizontally elongated cylindrical, at a point where the injection valve socket and mounting bosses are fixed, cylindrical sides is grain pushed toward the axis It is formed concave wall portion of the straight planar, at each location in the fuel passage pipe body injector sockets and mounting boss is fixed, the injection valve socket, the axial fuel passage tube body of the socket hole The mounting boss is fixed to the concave wall portion of the fuel passage pipe body in the vertical direction perpendicular to the axial direction, and the mounting boss has the axial direction of the mounting hole directed in the vertical direction perpendicular to the axial direction of the fuel passage pipe body. Nde injector socket and parallel is fixed to the recessed wall portion of the fuel passage pipe main body, the side that is secured to the fuel passage pipe main body of the mounting boss and opposite the outer peripheral surface of the fuel passage pipe main body of the injection valve socket fuel and secured to it are side and opposite the outer peripheral surface of the Rukoto gripping member affixed straddling the concave wall portion of the fuel passage pipe body, injector socket by the gripping member from the outer peripheral surface of the mounting boss bunch over the concave wall of the passage tube body It is to provide a high pressure fuel delivery pipe, for a direct injection engine, characterized in that.

  The gripping member is advantageously extended to the side opposite to the injection valve socket as viewed from the mounting boss and secured to the outer peripheral surface of the fuel passage pipe body.

  The grip member extends upward from a portion including the portion fixed to the injection valve socket to form a bent piece portion that is bent over the upper end of the injection valve socket, and the bent piece portion is formed on the upper surface of the fuel passage main body. It is more convenient if it adheres to the outer peripheral surface.

  According to the present invention, the planar concave wall portion perpendicular to the portion where the injection valve socket and the mounting boss of the fuel passage pipe main body are fixed is formed, and the axial direction of the socket hole is defined in the concave wall portion in the fuel passage pipe. The injection valve socket is fixed in the vertical direction perpendicular to the axial direction of the main body, the mounting boss is fixed in the vertical direction perpendicular to the axial direction of the fuel passage pipe main body, and the injection valve socket. The outer peripheral surface opposite to the side fixed to the fuel passage main body is fixed to the vicinity of the center portion of the gripping member, and the gripping member is bridged from the outer peripheral surface of the mounting boss to the outer peripheral surface of the fuel passage main body. Therefore, the process of manufacturing and manufacturing is simplified, and the fixing strength of the individual injection valve sockets and mounting bosses can be sufficiently secured.

  In addition, when the vicinity of the end fixed to the outer peripheral surface of the fuel passage tube main body of the gripping member is fixed to the concave wall portion of the fuel passage main body, the portion is fixed to the flat surface, and the productivity is good and the fixing Strength is improved. Further, the grip member is formed with a bent piece extending upward from the central portion thereof and bent over the upper end of the injection valve socket, and the bent piece is fixed to the outer peripheral surface of the upper surface of the fuel passage main body. When the structure is adopted, the strength of fixing the injection valve socket to the fuel passage tube main body, which applies a strong upward force when the engine is operating, is further improved. Corrosive salt water and dust are less likely to accumulate on the upper surface of the surface, improving durability.

1 is a side view showing an overall structure of a first embodiment of a high-pressure fuel delivery pipe for a direct injection engine according to the present invention. It is a top view of the delivery pipe of FIG. It is sectional drawing along the III-III line of the delivery pipe of FIG. It is a bottom view of the delivery pipe of FIG. It is sectional drawing along the VV line of the delivery pipe of FIG. It is sectional drawing along the VI-VI line of the delivery pipe of FIG. It is a side view equivalent to FIG. 1 which shows the whole structure of 2nd embodiment of the high pressure fuel delivery pipe for direct injection engines by this invention. FIG. 8 is a plan view of the delivery pipe of FIG. 7 corresponding to FIG. 2. It is sectional drawing along the IX-IX line of the delivery pipe of FIG. It is sectional drawing which shows the modification of the processing form of the fuel channel pipe main body in the delivery pipe of this invention.

  Hereinafter, embodiments of a high-pressure fuel delivery pipe for a direct injection engine according to the present invention will be described with reference to the drawings.

  In the first embodiment shown in FIGS. 1 to 3, the high-pressure fuel delivery pipe 10 for a direct-injection engine is used for an in-line four-cylinder direct-injection engine, and is supplied with pressurized fuel from a high-pressure fuel pump. The fuel passage pipe main body 11 is configured such that one injection valve socket 13 and one mounting boss 12 are fixed to each of the four locations in the axial direction of the fuel passage pipe main body 11. The fuel passage tube main body 11 is formed by crushing one extruded cylindrical body at four locations in the axial direction (longitudinal direction) from its side surface toward the axial line, thereby forming a vertical flat concave wall portion 11a. In relation to the fuel passage pipe main body 11 whose axial direction is oriented horizontally, one mounting boss 12 and one injection valve are provided at each concave wall portion 11a. The socket 13 is fixed in a line with each axial direction facing up and down. Both ends of the fuel passage main body 11 are closed with stopper plugs 17, and a fuel passage 20 is formed inside. A mounting hole 30 for mounting to the engine is formed in the mounting boss 12 with its axial direction directed vertically, and a fuel injection valve 40 (FIG. 1) that is controlled to open and close by the control unit. A socket hole 23 for holding the fuel passage tube body 11 in communication with the fuel passage tube main body 11 is formed with its axial direction facing up and down.

  By adopting a structure in which the mounting boss 12 and the injection valve socket 13 are fixed to the planar concave wall portion 11a, the fixing process is performed as compared with the case of fixing to the horizontal cylindrical portion of the fuel passage main body 11. Simple and higher bond strength is expected.

  At the location where the fuel passage pipe main body 11 and the injection valve socket 13 are fixed, a communication hole 21 for communicating with the socket hole 23 is formed in the concave wall portion 11 a of the fuel passage pipe main body 11. A communication hole 22 for communicating with the passage 20 is formed, and the fuel passage 20 communicates with the socket hole 23 by aligning the communication holes 21 and 22 (see FIG. 3). As a manufacturing process to be fixed, the mounting boss 12 and the injection valve socket 13 are positioned on the concave wall portion 11a of the fuel passage main body 11 and temporarily fixed by welding, and then solder is poured into the gap by brazing. Adhere closely. Reference numeral 18 indicates a connecting part for receiving the supply of high-pressure fuel from the fuel pump, and reference numeral 19 indicates a connecting part for connecting to the pressure sensor.

  In the present invention, a gripping member 14 is further provided, and the fuel valve pipe body 11 from the mounting boss 12 on the back surface side (the side opposite to the side fixed to the fuel path pipe body 11) of the injection valve socket 13 by the gripping member 14. It is straddling over and gripping. That is, the vicinity of the center portion of the gripping member 14 is fixed to the outer peripheral surface on the back side of the injection valve socket 13, and one end portion vicinity 14 a of the gripping member 14 is fixed to the outer peripheral surface of the mounting boss 12 on the rear side. The vicinity 14b of the other end of the member 14 is fixed to the outer peripheral surface of the fuel passage pipe body 11 at the location of the concave wall portion 11a. In this embodiment, the gripping member 14 has a bent piece portion 14c that extends upward from the vicinity of the central portion thereof and is bent across the upper end of the injection valve socket 13, and the vicinity of the distal end of the bent piece portion 14c is a fuel passage pipe. The main body 11 is fixed to the outer peripheral surface of the upper surface. In the example shown in the drawing, the bent piece portion 14c is widened so that the portion that covers and adheres to the upper surface of the fuel passage pipe body 11 extends along the fuel passage pipe body 11 in the right direction in the figure.

  By adopting such a structure, the fixing strength of the injection valve socket 13 to which the strong upward force is applied during engine operation to the fuel passage pipe body 11 is further increased, and the reliability of the delivery pipe is further improved. . Further, as environmental conditions in the engine, the upper surface side of the delivery pipe and the vicinity of the fixing boss 12 and the injection valve socket 13 are corrosive such as mud and rain water splashing during running, and calcium melt as a melting agent. Since the risk of corrosion also arises due to the adhesion of the dust, if the adhering portion of the injection valve socket 13 or a part of the upper surface of the fuel passage main body 11 is covered from above as in this embodiment. Therefore, the situation where the injection valve socket 13, the fuel passage pipe main body 11, and the fixing portion thereof corrode is reduced.

  The gripping member 14 will be further described with reference to FIGS. 5 and 6. The lower end edge of the gripping member 14 extends from the end on the side fixed to the mounting boss 12 to around the periphery of the injection valve socket 13. The flange portion 14f is formed by bending outward, and the upper end edge of the gripping member 14 is outside as long as it covers the mounting boss 12 up to the point where the bent piece portion 14c extends. The flange part 14e is formed by bending toward it. The flange portions 14e and 14f serve to give the rigidity of the flat portion of the gripping member 14. A state in which the bent piece 14c of the gripping member 14 is fixed to the outer peripheral surface of the upper surface of the fuel passage pipe body 11 across the upper end of the injection valve socket 13 is clearly shown in FIG. Since the vicinity of the tip of the bent piece 14c of the gripping member 14 is fixed to the outer peripheral surface of the upper surface of the fuel passage pipe main body 11, the fixing strength of the injection valve socket 13 to the fuel passage pipe main body 11 is further increased. Further, even when viewed from the mounting boss 12 side, the strength is improved in terms of the mounting structure by being connected to the injection valve socket 13 by the gripping member 14.

  Next, a second embodiment obtained by modifying a part of the first embodiment will be described with reference to FIGS. In this embodiment, the bent piece portion 14c is omitted from the gripping member 14 in the first embodiment, and as can be seen by comparing FIG. 7 and FIG. 1, FIG. 8 and FIG. 2, and FIG. The gripping member 15 grips the injection valve socket 13 across the fuel passage pipe body 11 from the mounting boss 12 on the back side thereof. That is, the vicinity of the center portion of the gripping member 15 is fixed to the outer peripheral surface on the back side of the injection valve socket 13, and one end portion vicinity 15 a of the gripping member 15 is fixed to the outer peripheral surface on the back side of the mounting boss 12. The other end portion 15b of the member 15 is fixed to the outer peripheral surface of the fuel passage main body 11 at the concave wall portion 11a. In the second embodiment, the gripping member 15 has a flange portion 15e formed by bending its upper end edge outward over its entire length, and the flange portion 15e is a side fixed to the mounting boss 12. To the end on the side fixed to the concave wall portion 11a of the fuel passage main body 11. Similarly, the lower end edge is also bent outward to form a flange portion 15f. The flange portion 15f is formed from the end portion on the side fixed to the mounting boss 12 as in the first embodiment. It is formed up to around the outer periphery of the injection valve socket 13, and the fuel passage pipe main body 11 does not exist at a corresponding height before that, so it is not extended.

  The cross-section along the line XX in FIG. 7 has the same shape as that of FIG. 3 described above, and the reference numerals for explaining the respective parts are the same except that the reference numerals for the gripping member 15 are 15, 15a, 15b. This is the same as in the case of the first embodiment.

  In the first and second embodiments described above, the location where the gripping members 14 and 15 are fixed is in a range from the rear outer periphery of the mounting boss 12 to the concave wall portion 11a with the injection valve socket 13 placed inside. However, it is also possible to extend the gripping members 14 and 15 to the opposite side of the injection valve socket 13 when viewed from the mounting boss 12 and to fix the extended portion to the outer peripheral surface of the fuel passage main body 11. In this case, the fixing strength of both the mounting boss 12 and the injection valve socket 13 to the fuel passage pipe body 11 is improved.

  Further, in the first and second embodiments described above, the concave wall portion 11a of the fuel passage pipe body 11 is crushed only in the vicinity of four places where the mounting boss 12 and the injection valve socket 13 are fixed. However, as shown in the cross-sectional view of FIG. 10, the range from the first location to the fourth location may be crushed together.

  As described above, according to the present invention, the mounting boss and the injection valve socket are fixed to the concave wall portion formed as a vertical flat surface by crushing the fuel passage pipe body, so that the fabrication is simple and the gripping is performed. Since the injection valve socket is gripped from the back surface by the member and secured to the mounting boss and the fuel passage pipe body, the fixing strength of the injection valve socket and the mounting boss to the fuel passage pipe body can be sufficiently secured. In addition, if a bent piece is provided on a part of the gripping member and is fixed to the upper surface of the fuel passage pipe body across the injection valve socket, the gripping strength of the injection valve socket during engine operation increases and the periphery of the fixed part The risk of corrosion is reduced.

  DESCRIPTION OF SYMBOLS 10 ... High pressure fuel delivery pipe for direct injection engines, 11 ... Fuel passage pipe main body, 11a ... Recessed wall part, 12 ... Mounting boss, 13 ... Injection valve socket, 14 ... Gripping member, 14c ... Bending piece part, 15 ... Gripping member 20 ... Fuel passage, 23 ... Socket hole, 30 ... Mounting hole, 40 ... Injection valve.

Claims (3)

A fuel passage pipe main body to which pressurized fuel is supplied from a high-pressure fuel pump, a single injection valve socket fixed to each of the fuel passage pipe main body at a plurality of positions in the axial direction, and the same respective portions And a socket hole for holding a fuel injection valve controlled to be opened and closed by a control unit in communication with the fuel passage pipe body. A high-pressure fuel delivery pipe for a direct injection engine in which a mounting hole for mounting to the engine is formed in the mounting boss,
The fuel passage tube main body is an elongated cylindrical shape, and its axial direction is disposed horizontally, and the cylindrical side surface is pushed toward the axis at a location where the injection valve socket and the mounting boss are fixed. grain is recessed wall portion of the vertical plane shape is formed,
In each part of the fuel passage pipe main body to which the injection valve socket and the mounting boss are fixed,
The injection valve socket is fixed to the concave wall portion of the fuel passage pipe body with the axial direction of the socket hole directed vertically in the direction perpendicular to the axial direction of the fuel passage pipe body,
The mounting boss is secured in the axial direction of the mounting hole in the recessed wall portion of the fuel passage pipe body Nde said injector sockets and parallel toward the axial direction and perpendicular to the vertical direction of the fuel passage pipe body ,
The outer peripheral surface of the mounting boss opposite to the side fixed to the fuel passage pipe main body, the outer peripheral surface of the injection valve socket opposite to the side fixed to the fuel passage pipe main body, and the fuel passage the Rukoto gripping member affixed straddling said recessed wall portion of the tube body, the injector socket by the gripping members put on the recessed wall portion of the fuel passage pipe main body from the outer circumferential surface of the mounting boss A high-pressure fuel delivery pipe for a direct injection engine characterized by The high pressure fuel delivery pipe for a direct injection engine according to claim 1,
The high-pressure fuel delivery pipe for a direct injection engine, wherein the gripping member extends to the opposite side of the injection valve socket as viewed from the mounting boss and is fixed to the outer peripheral surface of the fuel passage pipe main body. The high-pressure fuel delivery pipe for a direct injection engine according to claim 1 or 2,
The gripping member has a bent piece portion that extends upward from a portion including a portion fixed to the injection valve socket and is bent across the upper end of the injection valve socket, and the bent piece portion is the fuel passage pipe main body. A high-pressure fuel delivery pipe for a direct-injection engine, characterized in that the high-pressure fuel delivery pipe is fixed to the outer peripheral surface of the upper surface of the engine.

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