JP2006105005A - Injector mounting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injector mounting structure allowing smooth mounting work of an injector and inhibiting fuel leakage. <P>SOLUTION: The mounting structure for the injector 20 comprises the injector 20, a delivery pipe 30, a second seal part 26 and a positioning means 5. The injector 20 has a coupler part 22. The delivery pipe 30 is connected to the injector 20 rotatably about an axis line 20a of the injector 20 and supplies fuel to the injector 20 through a connection 2 with the injector 20. The second seal part 26 is provided on the connection 2 and seals the connection 2. The positioning means 5 is engaged with the delivery pipe 30 after connection of the injector 20 and the delivery pipe 30 and regulates posture of the injector 20 to a predetermined rotation position with respect to the delivery pipe 30. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an injector mounting structure in an engine including an injector such as an automobile.

  For example, in an engine such as an automobile, there is an engine including an injector. The injector is controlled to spray fuel by an external control device, and includes a coupler unit that accommodates a terminal that is electrically connected to the control device. The coupler part protrudes outside.

  The injector is inserted into a mounting hole formed on the engine side so that the spray port is desired for the intake pipe and the intake port. An inlet port of an injector to which fuel is supplied is inserted into the delivery pipe and connected to the delivery pipe.

  Such an injector includes an injector having directivity for spraying. The rotational position (orientation), that is, the attitude of the injector having directivity for spraying with respect to the delivery pipe or the fuel chamber in the mounting hole is determined in consideration of the fuel spraying direction.

  In addition, in order to smoothly install a plurality of injectors having directivity in spraying, the plurality of injectors and delivery pipes are unitized, and the plurality of unitized injectors and delivery pipes are moved to the engine side at once. It is possible to install.

  Specifically, a groove portion into which the coupler portion is fitted is formed in the delivery pipe. This groove portion is formed so that the coupler portion is fitted when the posture of the injector with respect to the delivery pipe is a predetermined posture in consideration of the fuel spray direction.

  That is, when the delivery pipe and each injector are unitized, the coupler is fitted into the groove, so that each injector is held by the delivery pipe in the predetermined posture.

  For this reason, by pressing the delivery pipe after making each injector face the corresponding mounting hole, all the injectors are inserted into the corresponding mounting holes at the same time in the predetermined posture. Therefore, each injector can be attached smoothly.

  On the other hand, a seal portion is provided around the inlet portion of the injector inserted into the delivery pipe, for example, by attaching an O-ring. The seal portion prevents the fuel supplied from the delivery pipe to the injector from leaking out.

  However, when the inlet portion of the injector is inserted into the delivery pipe, it is considered that the O-ring is broken due to rubbing of the O-ring, or the position of the O-ring is displaced and the seal portion does not function sufficiently. .

  In order to investigate such a state, an injector inlet is inserted into a delivery pipe to connect the injector and the delivery pipe, and then the injector is rotated around the axis of the injector. If there is no abnormality in the seal part, the injector rotates smoothly.

  If the O-ring is cut or the position of the O-ring is shifted, the injector does not rotate smoothly. In other words, when the injector does not rotate smoothly, the O-ring is cut or the position of the O-ring is shifted, and the seal portion is abnormal.

  When the state of the seal portion is inspected in this way, it is assumed that the injector can rotate when the inlet portion of the injector is inserted into the delivery pipe and connected to each other.

  However, as described above, when the injector having directivity for spraying is unitized with the delivery pipe, the coupler cannot be rotated because the coupler is fitted in the groove. For this reason, the state of the seal portion cannot be easily inspected.

  Accordingly, an object of the present invention is to provide an injector mounting structure capable of smoothly performing the mounting operation of an injector having directivity for spraying and suppressing fuel leakage.

  The injector mounting structure of the present invention includes an injector, a delivery pipe, a seal portion, and positioning means. The injector includes a main body portion and a coupler portion. The coupler portion projects from the side surface of the main body portion and receives a signal. In the delivery pipe, an injector is connected to be rotatable about an axial center line of the injector, and supplies fuel to the injector through a connection portion with the injector. The seal portion is provided in the connecting portion and seals the connecting portion. The positioning means engages with the delivery pipe after connecting the injector and the delivery pipe, and restricts the injector to a predetermined rotational position with respect to the delivery pipe.

  In the injector mounting structure configured as described above, in a state where the injector and the delivery pipe are connected and unitized, the state of the seal portion can be inspected by rotating the injector around the axis. it can. For this reason, when there is an abnormality in the seal portion, the abnormality can be found and repaired.

  Then, after the inspection is finished, the posture of the injector is regulated by the positioning means at a predetermined rotational position around the axis center line with respect to the delivery pipe. When the injector and delivery pipe unitized in this way are attached to the engine side, it is not necessary to adjust the attitude of the injector in consideration of the fuel spray direction.

  In a preferred form of the invention, the positioning means comprises a socket. The socket is interposed between the delivery pipe and the injector after the injector and the delivery pipe are connected to each other.

  In order to be able to easily regulate the attitude of the socket with respect to the delivery pipe and the attitude of the injector with respect to the socket, the socket is slid in a direction intersecting the axis of the injector and interposed between the injector and the delivery pipe. Disguise.

In the injector mounting structure configured as described above, the socket is slid and interposed between the delivery pipe and the injector, so that the attitude of the socket with respect to the delivery pipe is regulated. Similarly, the attitude of the injector with respect to the socket is restricted. For this reason, the work of interposing the socket between the delivery pipe and the injector, the work of regulating the attitude of the socket with respect to the delivery pipe, and the injector with respect to the socket It is possible to perform the work of regulating the posture of the user only by sliding the socket at the same time.

  In a preferred embodiment of the present invention, the injector mounting structure further includes a biasing member. The urging member is elastically deformed and interposed between the socket and the injector. The socket includes an urging member positioning portion. The urging member positioning portion regulates the posture of the urging member with respect to the socket.

  In the injector mounting structure configured as described above, when the socket is slid and interposed between the delivery pipe and the injector, the posture of the urging member with respect to the socket is restricted. For this reason, the operation | work which inserts a socket between a delivery pipe and an injector, and the operation | work which fixes the attitude | position of a biasing member with respect to a socket can be performed only by sliding a socket simultaneously.

  According to the injector mounting structure of the present invention, after the state of the seal portion is inspected, the injector can be restricted to a predetermined rotational position with respect to the delivery pipe and unitized with the delivery pipe.

  For this reason, the injector mounting structure of the present invention can smoothly perform the mounting operation of the injector and prevent fuel leakage.

  An injector mounting structure according to an embodiment of the present invention will be described with reference to FIGS. 1 to 10, taking as an example an injector 20 mounting structure in an automobile engine 1.

  As shown in FIG. 1, the injector 20 mounting structure includes an engine body 10, a plurality of injectors 20, a delivery pipe 30, a plurality of urging members 40, and positioning means 5.

  The engine 1 is, for example, a direct injection type reciprocating engine. The engine body 10 includes a cylinder head 11. The cylinder head 11 is formed with a first mounting hole 12 into which the injector 20 is inserted for each cylinder. As shown in FIGS. 9 and 10, the first mounting hole 12 opens into each combustion chamber 13.

  As shown in FIG. 2, each injector 20 includes a main body portion 21 and a coupler portion 22. The main body 21 has a cylindrical shape, and has a spray port 23a at one end. As for the main-body part 21, the edge part by the side in which the spray port 23a is formed becomes the spray part 23. The injector 20 is inserted into the first mounting hole 12 from the spray portion 23. Fuel is sprayed into the combustion chamber 13 from the spray port 23a. The injector 20 has directivity in the spray direction.

  In the main body 21, an inflow port 24a is formed at an end opposite to the spray port 23a. As for the main-body part 21, the inflow port 24a side becomes the insertion part 24. FIG. The insertion part 24 is cylindrical. The fuel is supplied to the injector 20 from the inflow port 24a.

  The spray part 23 is provided with a first seal part 25. The first seal portion 25 is provided by attaching a first O-ring 25 a around the spray portion 23. The insertion part 24 is provided with a second seal part 26. The second seal portion 26 is provided by attaching a second O-ring 26 a around the insertion portion 24. The second seal portion 26 is a seal portion referred to in the present invention.

  The main body portion 21 is provided with a first locking portion 27. The first locking portion 27 is formed closer to the inflow port 24a than the spray portion 23. The first locking portion 27 has a cross-sectional area larger than that of the spray portion 23 in a direction crossing the axial center line 20a of the injector 20.

  As shown in FIG. 10, the first locking portion 27 contacts the second locking portion 14 in the first mounting hole 12 when the injector 20 is inserted into the first mounting hole 12. . For this reason, the injector 20 is prevented from being inserted further. The second locking portion 14 has a two-step taper shape in the insertion direction of the injector 20 so that the inner wall 12a of the first mounting hole 12 is in contact with the first locking portion 27, so that the injector 20 can be aligned with the center of the first mounting hole 12.

  As shown in FIG. 2, the coupler portion 22 is provided in the vicinity of the fitting portion 28 formed on the main body portion 21 on the spray port 23 a side with respect to the insertion portion 24. The cross section of the fitting portion 28 crossing the axis 20a is substantially constant in the direction of the axis 20a. The coupler portion 22 protrudes outward from the fitting portion 28. Inside the coupler portion 22, a terminal that is electrically connected to a control device that controls spraying of the injector 20 is accommodated, and is connected to the control device. The coupler unit receives a signal from the control device.

  As shown in FIG. 1, the delivery pipe 30 includes a main pipe portion 31 and a plurality of branch pipe portions 32. Each branch pipe portion 32 communicates with the inside of the main pipe portion 31 and protrudes from the main pipe portion 31 toward the engine body 10 side.

  The distal end surface 33 of each branch pipe part 32 is a flat surface. As shown in FIG. 8, a second attachment hole 34 that opens to the distal end surface 33 is formed in each branch pipe portion 32. The insertion portion 24 of the injector 20 is inserted into the second mounting hole 34. Since the insertion part 24 is cylindrical, the injector 20 can rotate around the axial line 20 a of the injector 20 with respect to the branch pipe part 32. The second mounting hole 34 and the insertion portion 24 constitute a connecting portion 2 that connects the injector 20 and the delivery pipe 30.

  By inserting a part of the insertion portion 24 of the injector 20 into the second mounting hole 34, the injector 20 and the delivery pipe 30 are connected to each other, and the fuel in the delivery pipe 30 is supplied to the injector 20.

  As shown in FIG. 1, the delivery pipe 30 is fixed to the cylinder head 11 by a fixing portion 60. The fixed portion 60 includes a first boss portion 61 and a second boss portion 62. The first boss portion 61 projects outward from the side surface of the main pipe portion 31. The second boss portion 62 is provided on the surface of the cylinder head 11 and overlaps the first boss portion 61.

  A through hole 61 a is formed in the first boss portion 61. The second boss portion 62 is formed with a screw hole 62a communicating with the through hole 61a. The first boss portion 61 and the second boss portion 62 are fixed when the bolt 63 penetrating the through hole 61a is screwed into the screw hole 62a. Thereby, the delivery pipe 30 is fixed to the cylinder head 11.

  As shown in FIG. 2, each urging member 40 is interposed between the distal end surface 33 of each branch pipe portion 32 and the distal end surface 29 a in the insertion direction of the insertion portion 24 at the contact portion 29 of the injector 20. Is done. The contact portion 29 is formed closer to the spray portion 23 than the fitting portion 28 in the axial center line 20a direction. The tip end surface 29 a of the contact portion 29 faces the delivery pipe 30 when the injector 20 and the delivery pipe 30 are connected. The area of the front end surface 29a of the contact portion 29 is larger than the cross-sectional area of the fitting portion 28 in the direction perpendicularly crossing the axis 20a.

  FIG. 3 shows a state where only the urging member 40 is viewed from the delivery pipe 30 side in the direction of the axis 20a of the injector 20 in a state where the urging member 40 is interposed. As shown in FIGS. 2 and 3, the biasing member 40 includes a main body portion 41 and a pair of deformation portions 42. The main body portion 41 has a substantially rectangular plate shape, and is formed with a first housing portion 43.

  The first accommodating portion 43 passes through the main body portion 41 and has an opening 43 a that opens to the outside from one side edge of the main body portion 41. The first accommodating portion 43 has a size for accommodating the fitting portion 28 of the injector 20 and the base portion 22 a of the coupler portion 22. The base portion 22a indicates a root portion on the main body portion 21 side in the coupler portion 22. The opening 43a has a shape that substantially fits with the base 22a.

  The deformation portion 42 has a base portion 45 and an arm portion 46. Each of the base portions 45 is formed integrally with the main body portion 41 at one end face of the main body portion 41 at the corners on both sides of the first housing portion 43. The arm portion 46 extends from the base portion 45 toward the opening portion 43 a of the first housing portion 43 substantially in parallel with the main body portion 41 so as to overlap the main body portion 41. The distance between the arm portions 46 has an interval through which the fitting portion 28 and the coupler portion 22 can pass. Further, the outer edges 46a of the arms 46 are parallel to each other.

  Therefore, as shown in FIG. 3, the urging member 40 is substantially U-shaped when viewed in the direction of the axis 20 a of the injector 20. That is, in a state where the urging member 40 is attached to the injector, the urging member 40 is configured such that the one deforming portion 42 side and the other deforming portion 42 side are objects with respect to each other with the axis 20a of the injector 20 interposed therebetween. It has become a shape.

  As shown in FIG. 4, in the biasing member 40, the fitting portion 28 of the injector 20 is inserted into the first housing portion 43, and the main body portion 41 comes into contact with the distal end surface 29 a of the contact portion 29. Each of the deformable portions 42 is disposed on the delivery pipe 30 side.

  As shown in FIG. 2, the positioning means 5 includes a socket 50, a socket positioning part 70, and an injector positioning part 80.

  The socket 50 is biased with the branch pipe portion 32 after the biasing member 40 is attached to the injector 20 and the insertion portion 24 of the injector 20 is inserted into the second mounting hole 34 of the corresponding branch pipe portion 32. It is interposed between the members 40. As shown in FIG. 5, the socket 50 has a substantially columnar shape that overlaps the distal end surface 33 of the branch pipe portion 32.

  A second accommodating portion 52 is formed in the socket 50. The second accommodating portion 52 is formed from the delivery pipe side end surface 51 facing the distal end surface 33 of the delivery pipe 30 to the biasing member side end surface 53 facing the biasing member 40. The second accommodating portion 52 includes an opening 52 a that opens in a part of the side surface of the socket 50. The second accommodating portion 52 has a shape that substantially fits with the fitting portion 28.

  The biasing member side end surface 53 is an end surface facing the biasing member 40 in a state where the socket 50 is attached to the injector 20, and is an end surface on the opposite side to the delivery pipe side end surface 51.

  As shown in FIG. 4, the socket 50 is attached by being slid in the sliding direction A with the opening 52 a of the second accommodating portion 52 facing the opposite side surface with respect to the coupler portion 22 in the fitting portion 28. It is done. The sliding direction A is a direction from the opposite side of the fitting portion 28 to the coupler portion 22 toward the coupler portion 22.

  When the socket 50 is attached to the injector 20, the attitude of the socket 50 with respect to the delivery pipe 30 is regulated by the socket positioning portion 70.

  As shown in FIG. 5, the socket positioning portion 70 includes a pair of first protrusions 71 and a pair of notches 72. The first convex portions 71 are respectively formed on part of both edges of the delivery pipe side end surface 51 of the socket 50 with the second accommodating portion 52 interposed therebetween. Each of the first convex portions 71 protrudes toward the distal end surface 33 of each corresponding branch pipe portion 32. Each of the first convex portions 71 has a predetermined length in the sliding direction A of the socket 50.

  Each notch 72 is formed by notching the edge of the distal end surface 33 of the branch pipe portion 32 so as to engage with the corresponding first convex portion 71 in the sliding direction A. Each of the first protrusions 71 engages with the corresponding notch 72, whereby the posture of the socket 50 with respect to the delivery pipe 30 is fixed.

  FIG. 6 shows a state where the socket 50 is attached to the injector 20 as viewed from the delivery pipe 30 side in the direction of the axis 20a. As shown in FIG. 6, the posture of the injector 20 with respect to the socket 50 is regulated by the injector positioning portion 80.

  The injector positioning part 80 includes a second convex part 81 and a concave part 82. The second convex portion 81 protrudes outward from the opposite side of the coupler portion 22 across the axial center line 20a in the fitting portion 28 of the injector 20. Further, in the fitting portion 28, the side surface opposite to the coupler portion 22 across the axis 20 a is formed flat except for the second convex portion 81.

  The recess 82 is an urging member from the delivery pipe side end surface 51 so as to engage with the second protrusion 81 in the sliding direction A on the opposite side to the opening 52a on the inner wall of the second housing portion 52. It is formed along the axial center line 20 a over the side end face 53.

  Further, the side surface opposite to the opening 52a on the inner wall of the second housing portion 52 is formed flat so that the fitting portion 28 is in surface contact with the opposite side surface of the coupler portion 22 with the shaft center line 20a interposed therebetween. Yes. When the second convex portion 81 and the concave portion 82 are fitted to each other, the posture of the injector 20 with respect to the socket 50 is regulated.

  Further, the socket positioning part 70 and the injector positioning part 80 are adjusted so that the injector 20 is positioned in a predetermined posture around the axis 20a with respect to the delivery pipe 30.

  More specifically, the injector 20 has directivity in the fuel spray direction. Therefore, the posture of the injector 20 in the first mounting hole 12 is determined by the spray direction.

  For this reason, the posture of each injector 20 with respect to the delivery pipe 30 at the time of connection is determined so that when the delivery pipe 30 is fixed to the cylinder head 11, the injector 20 takes a posture in consideration of the spray direction in the first mounting hole 12. Has been.

  That is, the injector positioning portion 80 is adjusted so that the second housing portion 52 can house the fitting portion 28 according to the posture of the injector 20 with respect to the delivery pipe 30 described above. The socket positioning portion 70 is adjusted so that the socket 50 is engaged with the delivery pipe 30 in the adjusted posture as described above.

  Further, in a state where the second convex portion 81 is fitted in the concave portion 82, the second convex portion 81 is guided by the concave portion 82, so that the socket 50 is in the axial center line 20 a direction with respect to the injector 20. Can move.

  As shown in FIG. 7, the biasing member 40 is regulated in posture with respect to the socket 50 by a biasing member positioning portion 90 formed in the socket 50. The urging member positioning portion 90 includes a third convex portion 91. The third convex portion 91 constitutes an urging member positioning portion 90. The third convex portion 91 protrudes toward the biasing member 40 from a part of each edge of the biasing member side end surface 53 with the second housing portion 52 interposed therebetween. Each of the third convex portions 91 has a predetermined length in the sliding direction A. The distance L1 between the inner edges of the third convex portions 91 is substantially the same as or slightly larger than the distance L2 between the outer edges 46a of the both arm portions 46, respectively.

  By forming the third convex portions 91 in this way, the socket 50 is slid in the sliding direction after adjusting the posture of the urging member 40 so that the extending direction of the both arm portions 46 is substantially parallel to the sliding direction A. When slid to A, both arm portions 46 are fitted between the third convex portions 91. Thereby, the biasing member 40 is in a posture in which the opening 43a of the first housing portion 43 overlaps with the opening 52a of the second housing portion 52 so that the coupler portion 22 can move in the direction of the axis 20a. Be regulated.

  Further, the urging member 40 has a length from the main body portion 41 to the arm portion 46 so that the arm portion 46 bends when the first boss portion 61 and the second boss portion 62 are in contact with each other. Is set.

  That is, since the urging member 40 is bent in advance, the load applied to the injector is limited when the injector 20 is fixed to the cylinder head 11, so that the injector 20 can be prevented from being damaged. Moreover, since the dimensional differences of the delivery pipe 30, the injector 20, the first mounting hole 12, etc. are absorbed, the rattling of the injector 20 is eliminated.

  Next, an example of the installation work of the injector 20 will be described. First, the urging member 40 is attached to the injector 20 by inserting the injector 20 from the insertion portion 24 into the first accommodating portion 43 of the urging member 40. At this time, the base portion 22 a of the coupler portion 22 is substantially fitted with the opening portion 43 a of the first housing portion 43. Further, the main body portion 41 of the urging member 40 comes into contact with the distal end surface 29 a of the contact portion 29.

  Next, the insertion portion 24 of each injector 20 is inserted into the second accommodating portion 52 of the corresponding branch pipe portion 32. When the insertion portion 24 of the injector 20 is inserted into the second accommodating portion 52, the injector 20 is held by the delivery pipe 30 due to friction between the second seal portion 26 and the inner wall of the second mounting hole 34. .

  Next, as shown in FIG. 8, the state of the second seal portion 26 is inspected by rotating each injector 20 around the axis 20 a with respect to each branch pipe portion 32. When the injector 20 rotates smoothly, the second O-ring 26a is in a normal state.

  On the other hand, when the insertion portion 24 is inserted into the second mounting hole 34, the second O-ring 26a is cut by friction between the second O-ring 26a and the inner wall 34a of the second mounting hole 34, Or the 2nd O-ring 26a may shift | deviate from a regular attachment position.

  In such a case, the injector 20 does not rotate smoothly around the axis 20a. In other words, when the injector 20 is rotated around the axis 20a and the injector 20 does not rotate smoothly and is caught, the second O-ring 26a is cut or the second O-ring is turned off. The position of 26a is shifted.

  For this reason, when the injector 20 does not rotate smoothly around the axis 20a, the injector 20 is removed from the delivery pipe 30, and the second O-ring 26a is replaced, or the position of the second O-ring 26a is properly set. Correct the mounting position. Thereafter, the insertion portion 24 of the injector 20 is inserted into the second mounting hole 34, and the second seal portion 26 is inspected again.

  As shown in FIG. 4, when the inspection of the second seal portion 26 is finished and it is confirmed that there is no abnormality in the second seal portion 26, the biasing member 40 and the branch pipe portion 32 are respectively separated. The socket 50 is attached.

  Specifically, the second convex portion 81 is engaged with the concave portion 82 so that the first convex portion 71 is engaged with the corresponding notch portion 72, and both the third convex portions 91 are engaged. The posture of the socket 50 is adjusted so that both arm portions 46 of the biasing member 40 are fitted therebetween.

  Next, the socket 50 is slid in the sliding direction A as indicated by an arrow in the figure. As shown in FIGS. 6 and 9, the socket 50 is slid until the second convex portion 81 is engaged with the concave portion 82.

  As the socket 50 is slid, each first protrusion 71 engages with the corresponding notch 72. Thereby, the attitude | position of the socket 50 with respect to the delivery pipe 30 is controlled. As the socket 50 is slid, the second convex portion 81 engages with the concave portion 82. Thereby, the attitude | position of the injector 20 with respect to the socket 50 is controlled. The posture of the injector 20 at this time is a predetermined posture in consideration of the fuel spray direction.

  As the socket 50 is slid, the arm portion 46 of the biasing member 40 is fitted between the third convex portions 91. Thereby, the attitude | position of the biasing member 40 with respect to the socket 50 is fixed. The posture of the urging member 40 at this time is such that the opening portion 52a of the second housing portion 52 and the opening portion 43a of the first housing portion 43 so that the coupler portion 22 can move in the direction of the axis 20a. Overlapping posture.

  When the socket 50 is interposed between each branch pipe portion 32 and the urging member 40, each injector 20 and the delivery pipe 30 are connected to each other with respect to the delivery pipe 30 as shown in FIG. 1. They are unitized with each other in a state where they are positioned in a posture in consideration of the fuel spray direction.

  In this state, by operating the delivery pipe 30, each injector 20 is opposed to the corresponding first mounting hole 12. Then, each injector 20 is simultaneously inserted into the first mounting hole 12 by pressing the delivery pipe 30.

  At this time, the posture of the injector 20 is maintained in a posture in consideration of the fuel spray direction. For this reason, it is not necessary to adjust the posture of each injector 20 in the process of inserting each injector 20 into the corresponding first mounting hole 12.

  As shown in FIG. 10, each injector 20 is inserted until the first locking portion 27 and the second locking portion 14 come into contact with each other. The delivery pipe 30 is pressed until the first boss portion 61 comes into contact with the second boss portion 62. After the first boss portion 61 comes into contact with the second boss portion 62, the delivery pipe 30 is fixed to the cylinder head 11 with a bolt 63.

When the first boss portion 61 and the second boss portion 62 come into contact with each other, the deformed portion 42 of the biasing member 40 is bent. Thereby, since the load concerning the injector 20 is restrict | limited, the damage of the injector 20 is prevented. Further, when there is a dimensional difference in the injector 20, the delivery pipe 30, the first mounting hole 12, the second mounting hole 34, etc., the rattling of the injector 20 is absorbed. In the mounting structure, the insertion portion 24 is inserted into the branch pipe portion 32, whereby the injector 20 is connected to the delivery pipe 30 so as to freely rotate around the axis 20 a.

  Thereby, after each injector 20 and the delivery pipe 30 are unitized, the second seal portion 26 can be inspected by rotating the injector 20 about the axis 20a. As a result, the abnormality of the second seal portion 26 is discovered in advance. That is, by detecting an abnormality in the second seal portion 26 and repairing it, fuel leakage from the second seal portion 26 is suppressed.

  After the second seal portion 26 is inspected, the positioning unit 5 positions the injector 20 with respect to the delivery pipe 30 in a posture in consideration of the fuel spray direction around the axis 20a.

  Accordingly, each injector 20 can be inserted into the corresponding first mounting hole 12 at a time, and when each injector 20 is inserted into the corresponding first mounting hole 12, the posture of each injector 20 is set one by one. Since it is not necessary to adjust, the installation work of each injector 20 can be performed smoothly.

  That is, the injector 20 can be smoothly attached and fuel leakage can be suppressed.

  The positioning means 5 includes a socket 50, a socket positioning part 70, and an injector positioning part 80. For this reason, the injector 20 can be positioned with respect to the delivery pipe 30 in the posture which considered the spray direction of fuel with one component. Therefore, the cost of the mounting structure of the injector 20 can be suppressed.

  The socket 50 is attached by being slid in a direction crossing the axis 20a of the injector 20. And the notch part 72 corresponding to the 1st convex part 71 respectively engages with the sliding direction A of the socket 50 simultaneously, when the socket 50 is slid and attached. Similarly, the second convex portion 81 and the concave portion 82 simultaneously engage in the sliding direction A of the socket 50 when the socket 50 is slid and attached.

  For this reason, since the operation | work which mutually engages the delivery pipe 30 and the socket 50 and the operation | work which mutually engages the socket 50 and the injector 20 are performed simultaneously with the mounting operation | work of the socket 50, it can carry out easily.

  In addition, the mounting structure of the injector 20 includes a biasing member 40. Thereby, since the load concerning the injector 20 is restrict | limited, the damage of the injector 20 is prevented. Further, rattling of the injector 20 due to dimensional differences between the injector 20 and the delivery pipe 30 can be suppressed.

  In addition, since the pair of third convex portions 91 are formed on the socket 50, both arm portions 46 of the biasing member 40 are fitted between the third convex portions 91 when the socket 50 is slid and attached. Combined. Thereby, the biasing member 40 is positioned with respect to the socket 50. Therefore, the urging member 40 can be easily positioned with respect to the socket 50.

The perspective view which shows the attachment structure of the injector which concerns on 1 embodiment of this invention. The perspective view which decomposes | disassembles and shows the attachment structure of the injector shown by FIG. The top view which shows the state which looked at the biasing member shown by FIG. 1 from the delivery pipe side in the axial center line direction of the injector. The perspective view which shows a mode that the socket shown by FIG. 1 is attached to the delivery pipe and injector which were unitized. The perspective view which shows a socket positioning part. The top view which shows an injector positioning part. The perspective view which shows a biasing member positioning part. The side view which shows the mode of a test | inspection of a 2nd seal | sticker part. The side view which partially cuts and shows the state by which the delivery pipe, the injector, the socket, and the biasing member were unitized. FIG. 3 is a side view showing a state where a unitized delivery pipe, an injector, a socket, and an urging member are fixed to the engine body, partly cut away.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 2 ... Connection part, 5 ... Positioning means, 20 ... Injector, 20a ... Center axis, 21 ... Main body part, 22 ... Coupler part, 26 ... 2nd seal part (seal part), 30 ... Delivery pipe, 40 ... With Urging member, 50... Socket, 90 urging member positioning portion, A... Sliding direction (direction intersecting the axis)

Claims (3)

An injector comprising a main body and a coupler that protrudes from the side of the main body and receives a signal;
A delivery pipe connected to the injector so as to be freely rotatable about an axial line of the injector, and supplying fuel to the injector through a connecting portion with the injector;
A seal portion provided at the connecting portion and sealing the connecting portion;
Positioning means for engaging the delivery pipe after the connection between the injector and the delivery pipe, and restricting the injector to a predetermined rotational position with respect to the delivery pipe;
An injector mounting structure comprising: The positioning means includes
After the injector and the delivery pipe are connected to each other, a socket is provided between the delivery pipe and the injector so as to be slid and interposed in a direction crossing the axial center line of the injector. The injector mounting structure according to claim 1. In the description of claim 2,
A biasing member interposed between the socket and the injector by elastic deformation;
2. The injector mounting structure according to claim 1, wherein the socket includes a biasing member positioning portion that regulates a posture of the biasing member with respect to the socket.

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