JP2005282561A - Attaching structure of fuel injection valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an attaching structure of a fuel injection valve which reduces the space required for fixing the fuel injection valve to a cylinder head, and facilitates fixation of the fuel injection valve even at the time the fuel injection valve is deeply inserted to the cylinder head. <P>SOLUTION: A first fixing member 60 having a male screw part 61 on its outer walls is screwed into a female screw part 31 formed on the inner walls of the cylinder head 20. An injector 40 which is housed in a hole part 30 formed by the cylinder head 20 gets caught between the first and second fixing members 60, 70 and the cylinder head 20, and is fixed to the cylinder head 20. Since the injector 40, the first fixing member 60 and the second fixing member 70 are housed in the hole part 30, the space for fixing the injector 40 to the cylinder head 20 is reduced. By adjusting the length of the first fixing member 60 and the second fixing member 70 in the axis direction, the injector 40 is easily installed on the cylinder head 20 regardless of the depth of the hole part 30. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fuel injection valve mounting structure in an internal combustion engine.

  As a fuel injection valve mounting structure in an internal combustion engine, for example, a technique disclosed in Patent Document 1 is known. That is, a fixing member is attached to the end of the fuel injection valve on the side opposite to the combustion chamber, and the fuel injection valve is sandwiched between the fixing member and the cylinder head. In this case, in order to correspond to the pressure in the combustion chamber, the fixing member is made of a material having relatively high rigidity, and the fixing member is fixed to the cylinder head by a screw member.

Japanese Patent Laid-Open No. 9-88765

  In the case of the technique disclosed in Patent Document 1, a space for installing a fixing member and a screw member is required around the fuel injection valve. However, many parts are installed around the cylinder head. In recent years, the density of components installed around the cylinder head has been increasing. Therefore, it is difficult to secure a space for installing the fixing member and the screw member. For example, when a fuel injection valve is arranged in the center of the combustion chamber, the fuel injection valve needs to be inserted deeply through the cylinder head. For this reason, it is difficult to fix the fuel injection valve with the fixing member and the screw member.

  Accordingly, an object of the present invention is to reduce the space required for fixing the fuel injection valve to the cylinder head and to facilitate the fuel injection even when the fuel injection valve is inserted deeply into the cylinder head. The object is to provide a valve mounting structure.

  In the first aspect of the present invention, the fixing member has a male screw portion that is screwed to a female screw portion formed on the inner wall of the cylinder head. Therefore, the fixing member sandwiches the fuel injection valve between itself and the cylinder head, and is accommodated in the hole of the cylinder head. Therefore, a space required for fixing the fuel injection valve to the cylinder head can be reduced. The fuel injection valve is securely fixed between the fixing member and the cylinder head. Therefore, even when the fuel injection valve is inserted deeply through the cylinder head, the fuel injection valve is fixed to the cylinder head by screwing the fixing member. Therefore, the fuel injection valve can be easily fixed to the cylinder head. Further, the fuel injection valve is fixed to the cylinder head by fastening the fixing member and the cylinder head. Therefore, by adjusting the tightening torque of the fixing member, the fuel injection valve is fixed to the cylinder head with a constant force regardless of the tolerance of the fuel injection valve. Therefore, the force applied to the fuel injection valve can be reduced, and the characteristic change of the fuel injection valve can be prevented.

  In the invention according to claim 2, the fixing member contacts the fuel injection valve at the contact portion arranged on the opposite side to the male screw portion. Therefore, the fastening force between the male screw portion and the female screw portion is a force for sandwiching the fuel injection valve between the cylinder head and the contact portion. Therefore, the fuel injection valve can be reliably fixed to the cylinder head. Further, by adjusting the fastening torque of the fixing member, the force can be easily adjusted when the fuel injection valve is sandwiched between the fixing member and the cylinder head.

  In the invention according to claim 3, the fixing member accommodates the piping member on one end side. Therefore, the piping member, the fixing member, and the fuel injection valve are arranged substantially coaxially. Therefore, the space for installing the fuel injection valve can be reduced. Further, by fixing the fuel injection valve to the cylinder head using the fixing member to which the piping member is attached, the attachment of the fuel injection valve and the connection of the piping member are performed simultaneously. Therefore, the assembly man-hour can be reduced.

In the invention according to claim 4, the fixing member accommodates the injector. Therefore, the inside of the fixed member is a fuel passage that connects the piping member and the fuel inlet side of the fuel injection valve. Therefore, the fuel supplied via the piping member can be easily and reliably supplied to the fuel injection valve.
In the invention according to claim 5, the fixing member has a first member and a second member. Therefore, it is easy to mold the fixing member by increasing the shape accuracy of the first member on which the male screw portion is formed as compared with the second member. Therefore, manufacturing man-hours and manufacturing costs can be reduced.

  In the invention according to claim 6 or 7, the first member is disposed on the side opposite to the injection hole or radially outside of the second member. Therefore, the fastening force between the male screw portion of the first member and the female screw portion of the cylinder head is transmitted from the first member to the second member. By extending the axial length of the second member, the fuel injection valve can be reliably and easily fixed even when the fuel injection valve is inserted deep in the cylinder head. Further, the first member for securing the fastening force and the second member in contact with the injector can share the role. Therefore, the second member is not required to have shape accuracy as compared with the first member. Therefore, manufacturing man-hours and manufacturing costs can be reduced.

  In the invention according to claim 8, at least a part of the fixing member is installed inside the hole of the cylinder head. The fixing member presses the fuel injection valve in the axial direction toward the cylinder head. Therefore, the fixing member presses the fuel injection valve against the cylinder head, and at least a part of the fixing member is accommodated in the hole of the cylinder head. Therefore, a space required for fixing the fuel injection valve to the cylinder head can be reduced. The fuel injection valve is fixed between the fixing member and the cylinder head. Therefore, even when the fuel injection valve is inserted deeply through the cylinder head, the fuel injection valve is fixed to the cylinder head by the fixing member. Therefore, the fuel injection valve can be easily fixed to the cylinder head. Furthermore, the fixing member has a fuel passage inside. Therefore, the fuel supplied to the fuel injection valve can flow inside the fixed member.

  According to the ninth aspect of the present invention, the fixing member is separate from the piping member through which the fuel supplied to the fuel injection valve flows, and is sandwiched between the piping member and the cylinder head. Therefore, the fixing member is installed between the piping member and the fuel injection valve. Thereby, for example, after the fuel injection valve is installed in the hole of the cylinder head, the fixing member is further installed in the hole. And a fixing member is installed between a piping member and a fuel injection valve by connecting a piping member to the edge part on the opposite side to the fuel injection valve of a fixing member. The fuel injection valve is pressed against the cylinder head by a fixing member connected to the piping member. Therefore, the fuel injection valve can be easily fixed to the cylinder head. The fixing member fixed to the hole is provided with a piping member on one end side. Therefore, the piping member, the fixing member, and the fuel injection valve are arranged substantially coaxially. Therefore, the space for installing the fuel injection valve can be reduced. Further, by fixing the fuel injection valve to the cylinder head using the fixing member to which the piping member is attached, the attachment of the fuel injection valve and the connection of the piping member are performed simultaneously. Therefore, the assembly man-hour can be reduced.

  The invention according to claim 10 includes an elastic member installed between the piping member and the fixing member. The elastic member absorbs a change in relative position between the piping member and the fixing member. Therefore, even if the distance between the fixing member and the piping member changes, the position of the fuel injection valve pressed against the cylinder head by the fixing member does not change. Further, the elastic member absorbs the dimensional tolerance of the fuel injection valve. Therefore, the fuel injection valve is fixed to the cylinder head with a constant force. Therefore, the force applied to the fuel injection valve can be reduced, and the characteristic change of the fuel injection valve can be prevented.

  In the invention described in claim 11, the elastic member presses the fixing member toward the cylinder head. The pressing force of the elastic member is a force that sandwiches the fuel injection valve between the fixed member and the cylinder head. Therefore, the fuel injection valve can be reliably held on the cylinder head. Further, by adjusting the pressing force of the elastic member, the force can be easily adjusted when the fuel injection valve is sandwiched between the fixing member and the cylinder head.

In invention of Claim 12, it is formed in the cylinder shape. Thereby, the fixing member has a fuel passage inside. The fuel supplied from the piping member to the fuel injection valve flows inside the cylindrical fixing member. Therefore, even when there is a distance between the fuel injection valve and the piping member and a fixing member is installed between them, fuel is reliably supplied to the fuel injection valve.
In a thirteenth aspect of the present invention, a sealing member is provided between the fixing member and the piping member. Fuel flows on the inner peripheral side of the fixing member. Therefore, by installing the seal member, fuel leakage from the connection portion between the fixed member and the piping member is prevented.

  In the invention described in claim 14, the fixing member may be integral with the piping member. That is, the end of the piping member on the cylinder head side extends into the hole. The end of the fixing member on the cylinder head side is in contact with the fuel injection valve and presses the fuel injection valve toward the cylinder head. Thereby, the number of parts can be reduced. Moreover, since the fixing member is integral with the piping member, the piping member, the fixing member, and the fuel injection valve are disposed substantially coaxially. Therefore, the space for installing the fuel injection valve can be reduced. Further, by fixing the fuel injection valve to the cylinder head using a fixing member integral with the piping member, the fuel injection valve is attached and the piping member is connected at the same time. Therefore, the assembly man-hour can be reduced.

  In the fifteenth aspect of the invention, the hole portion in which the fuel injection valve is accommodated is disposed between the intake valve and the exhaust valve. That is, the fuel injection valve is disposed in the center of the combustion chamber. For example, in order to improve the performance of the internal combustion engine, such as reduction of fuel consumption and reduction of harmful substances contained in exhaust from the internal combustion engine, the fuel injection valve is placed between the intake valve and the exhaust valve, that is, in the center of the combustion chamber. It is desirable to arrange in. On the other hand, when the fuel injection valve is disposed between the intake valve and the exhaust valve, the hole formed in the cylinder head becomes deep, making it difficult to install the fuel injection valve. Therefore, in the invention described in claim 8, even when the hole is disposed between the intake valve and the exhaust valve by inserting the fixing member into the hole and fixing it to the cylinder head, the fuel injection valve can be reliably and Easily fixed. As a result, the fuel injection valve forms a spray of a desired shape in the center of the combustion chamber. Accordingly, the efficiency and fuel consumption of the internal combustion engine can be improved, and NOx contained in the exhaust from the internal combustion engine can be reduced.

In the invention described in claim 16, the fixing member is installed from the side opposite to the injection hole of the fuel injection valve inserted into the hole. The fixing member installed in the hole sandwiches the fuel injection valve between itself and the cylinder head and is installed inside the cylinder head. Therefore, the space required for installing the fuel injection valve can be reduced. The fuel injection valve is securely fixed between the fixing member and the cylinder head. Therefore, even when the fuel injection valve is inserted deeply through the cylinder head, the fuel injection valve is fixed to the cylinder head by screwing the fixing member. Therefore, the fuel injection valve can be easily fixed to the cylinder head.
The fixing member is inserted from the side opposite to the injection hole of the fuel injection valve inserted into the hole. The fixing member inserted into the hole is screw-coupled to a female thread formed on the inner wall of the cylinder head. Therefore, the fixing member sandwiches the fuel injection valve between itself and the cylinder head and is fixed to the cylinder head. Therefore, a space required for fixing the fuel injection valve to the cylinder head can be reduced. The fuel injection valve is securely fixed between the fixing member and the cylinder head. Therefore, even when the fuel injection valve is inserted deeply through the cylinder head, the fuel injection valve is fixed to the cylinder head by screwing the fixing member. Therefore, the fuel injection valve can be easily fixed to the cylinder head. Further, the fuel injection valve is fixed to the cylinder head by fastening the fixing member and the cylinder head. Therefore, by adjusting the tightening torque of the fixing member, the fuel injection valve is fixed to the cylinder head with a constant force regardless of the tolerance of the fuel injection valve. Therefore, the force applied to the fuel injection valve can be reduced, and the characteristic change of the fuel injection valve can be prevented.

  In the invention described in claim 17, the fixing member fixed to the hole is provided with a piping member on one end side. Therefore, the piping member, the fixing member, and the fuel injection valve are arranged substantially coaxially. Therefore, the space for installing the fuel injection valve can be reduced. Further, by fixing the fuel injection valve to the cylinder head using the fixing member to which the piping member is attached, the attachment of the fuel injection valve and the connection of the piping member are performed simultaneously. Therefore, the assembly man-hour can be reduced.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 2 shows a direct-injection gasoline engine that is an internal combustion engine (hereinafter referred to as “engine”) to which the fuel injection valve mounting structure according to the first embodiment of the present invention is applied. The engine 10 includes a cylinder block 11 and a cylinder head 20. The cylinder block 11 forms a cylindrical cylinder 12. The cylinder block 11 and the cylinder head 20 are formed by casting of iron or aluminum alloy, for example. The cylinder 12 supports the piston 13 so as to be able to reciprocate. A combustion chamber 14 is formed from the inner wall of the cylinder block 11 forming the cylinder 12, the end face of the piston 13 on the cylinder head 20 side, and the end face of the cylinder head 20 on the piston 13 side.

  The cylinder head 20 has an intake passage 21 and an exhaust passage 22. The intake passage 21 and the exhaust passage 22 are each connected to the combustion chamber 14. The end of the intake passage 21 on the combustion chamber 14 side is opened and closed by an intake valve 23. Similarly, the end of the exhaust passage 22 on the combustion chamber 14 side is opened and closed by an exhaust valve 24. The intake valve 23 has a shaft 25 that penetrates the cylinder head 20. A seal member 26 seals between the shaft 25 and the cylinder head 20. Further, the exhaust valve 24 has a shaft 27 that penetrates the cylinder head 20. A seal member 28 seals between the shaft 27 and the cylinder head 20.

  The cylinder head 20 has a hole 30 between the intake valve 23 and the exhaust valve 24. The hole 30 penetrates the cylinder head 20 in the plate thickness direction. The engine 10 includes a fuel injection valve (hereinafter referred to as “injector”) 40, and the injector 40 is accommodated in the hole 30. As shown in FIG. 1, an internal thread portion 31 is formed at the end of the anti-combustion chamber on the inner wall of the cylinder head 20 that forms the hole 30. Further, the hole 30 formed by the cylinder head 20 has a large-diameter portion 32, a medium-diameter portion 33, and a small-diameter portion 34 having different inner diameters. The hole portion 30 is arranged in the order of the small diameter portion 34, the medium diameter portion 33, and the large diameter portion 32 in the axial direction from the combustion chamber 14 side. The medium diameter portion 33 has an inner diameter larger than the small diameter portion 34 and smaller than the large diameter portion 32. A female thread portion 31 is formed on the side of the large diameter portion 32 opposite to the middle diameter portion.

  The injector 40 includes a nozzle 41, a flange 42, a drive unit 43, a supply unit 44, and the like. A nozzle hole 45 is formed at the end of the nozzle 41 on the combustion chamber 14 side. The nozzle 41 is inserted into the small diameter portion 34 of the hole 30. A seal member 46 is installed between the inner wall of the cylinder head 20 that forms the hole 30 and the nozzle 41. The seal member 46 is formed of, for example, a fluorine-containing resin, and prevents the combustion gas from leaking from the combustion chamber 14. The flange 42 is abutted against a step portion 35 formed on the inner wall of the cylinder head 20 at a portion where the large diameter portion 32 and the medium diameter portion 33 of the hole portion 30 are connected. When the flange 42 and the stepped portion 35 abut against each other, the axial position of the injector 40 is determined. A stepped portion 36 formed on the inner wall of the cylinder head 20 abuts the injector 40 at a portion where the medium diameter portion 33 and the small diameter portion 34 are connected to each other. A washer 47 is installed between the injector 40 and the stepped portion 36.

A valve member (not shown) that is driven by the drive unit 43 is accommodated in the injector 40. The valve member reciprocates in the axial direction of the injector 40. The drive unit 43 includes a coil (not shown) that drives the valve member. The valve member reciprocates in the axial direction of the injector 40 by intermittently energizing the coil from an ECU (not shown). Thereby, the nozzle hole 45 is opened and closed.
The supply unit 44 is installed on the side opposite to the injection hole of the drive unit 43. Fuel is supplied to the injector 40 from a fuel tank (not shown) via the piping member 51 of the fuel supply unit. The fuel supplied via the piping member 51 flows into the supply unit 44 of the injector 40. The fuel that has flowed into the supply unit 44 flows through the injector 40 and is injected from the injection hole 45 into the combustion chamber 14.

  The engine 10 includes a first fixing member 60 and a second fixing member 70. The first fixing member 60 and the second fixing member 70 are arranged substantially coaxially. The first fixing member 60 has a male screw portion 61 on the outer wall, and is screwed to a female screw portion 31 formed on the inner wall of the cylinder head 20. The first fixing member 60 is in contact with the second fixing member 70 at the end opposite to the male screw portion 61 in the axial direction. The first fixing member 60 is formed in a cylindrical shape, and has an accommodating portion 62 that accommodates the piping member 51 inside the male screw portion 61 in the radial direction. The piping member 51 is fixed by being press-fitted into the accommodating portion 62 of the first fixing member 60. The first fixing member 60 has a cylindrical portion 63 extending toward the second fixing member 70 side. The cylinder part 63 has a larger inner diameter than the accommodating part 62 and accommodates the supply part 44 of the injector 40 therein.

  A sealing member 48 is installed between the injector 40 and the first fixing member 60. The seal member 48 prevents the fuel supplied from the piping member 51 from flowing toward the combustion chamber 14 along the outer wall of the injector 40. Thereby, the fuel supplied from the piping member 51 flows to the supply part 44 of the injector 40 via the inner peripheral side of the cylindrical part 63. Therefore, the inner peripheral side of the first fixing member 60 constitutes a fuel passage 64 through which fuel flows. The injector 40, the first fixing member 60, the second fixing member 70, and the piping member 51 are arranged substantially coaxially. The first fixing member 60 may be formed with a hole for drawing a lead wire connected to a coil (not shown) of the injector 40 to the outside.

  The second fixing member 70 is installed on the combustion chamber 14 side of the first fixing member 60 in the axial direction. The second fixing member 70 is installed on the outer peripheral side of the drive unit 43 of the injector 40. One end of the second fixing member 70 is in contact with the first fixing member 60. The second fixing member 70 has a contact portion 71 that contacts the flange 42 of the injector 40 at the end opposite to the first fixing member 60.

Next, a method for assembling the injector 40 to the cylinder head 20 will be described.
When attaching the injector 40 to the cylinder head 20, the injector 40 is inserted into the hole 30. Since the seal member 46 is attached to the nozzle 41 of the injector 40, the nozzle 41 is press-fitted into the small diameter portion 34. Prior to insertion of the injector 40, a washer 47 is installed in the stepped portion 36 of the cylinder head 20. The injector 40 is inserted until the flange 42 contacts the step portion 35. The axial position of the injector 40 is determined by the contact between the flange 42 and the stepped portion 35.

  When the injector 40 is inserted into the hole 30, the second fixing member 70 is installed on the outer peripheral side of the injector 40. The second fixing member 70 has a cylindrical shape and is installed between the outer wall of the injector 40 and the inner wall of the cylinder head 20 that forms the hole 30. The inner diameter of the second fixing member 70 is slightly larger than the outer diameter of the injector 40. Therefore, the second fixing member 70 is easily installed on the outer peripheral side of the injector 40. At this time, the contact portion 71 of the second fixing member 70 is in contact with the flange 42 of the injector 40.

When the second fixing member 70 is installed, the first fixing member 60 is installed on the anti-combustion chamber side of the second fixing member 70. A piping member 51 is attached to the first fixing member 60 in advance. The first fixing member 60 to which the piping member 51 is attached is attached to the cylinder head 20 by fastening the male screw portion 61 to the female screw portion 31 of the cylinder head 20. At this time, the first fixing member 60 moves toward the second fixing member 70 by screwing the first fixing member 60 into the cylinder head 20. The first fixing member 60 is in contact with the second fixing member 70. When the first fixing member 60 is further screwed in after the first fixing member 60 and the second fixing member 70 are in contact with each other, the first fixing member 60 causes the flange 42 of the injector 40 to be connected to the cylinder head via the second fixing member 70. Press to 20 stepped portions 35. That is, the flange 42 of the injector 40 is sandwiched between the second fixing member 70 pressed from the first fixing member 60 and the cylinder head 20.
By adjusting the tightening torque of the first fixing member 60, the force for pressing the injector 40 against the cylinder head 20 is adjusted. At this time, the force with which the first fixing member 60 presses the injector 40 has a magnitude that can counteract the force applied to the injector 40 by the combustion gas in the combustion chamber 14.

  According to the first embodiment described above, the injector 40 is sandwiched and fixed to the cylinder head 20 by the first fixing member 60 and the second fixing member 70. The injector 40, the first fixing member 60, and the second fixing member 70 are all inserted into the hole 30 formed by the cylinder head 20. Moreover, the injector 40, the 1st fixing member 60, and the 2nd fixing member 70 are arrange | positioned substantially coaxially. Therefore, a space required for fixing the injector 40 to the cylinder head 20 can be reduced. Further, the injector 40 can be disposed between the intake valve 23 and the exhaust valve 24 by reducing the space required for fixing the injector 40. Therefore, the injector 40 can be installed at the center of the combustion chamber 14. As a result, a spray having a desired shape is formed in the combustion chamber 14. Therefore, the efficiency and fuel consumption of the engine 10 can be increased, and NOx contained in the exhaust from the engine 10 can be reduced.

  In the first embodiment, by screwing the first fixing member 60 into the cylinder head 20, the first fixing member 60 presses the injector 40 against the cylinder head 20 in the axial direction via the second fixing member 70. Therefore, attachment of the injector 40 to the cylinder head 20 is a simple process of inserting the injector 40 and the second fixing member 70 into the hole 30 and fastening the first fixing member 60 into the hole 30. Further, by adjusting the length of the first fixing member 60 or the second fixing member 70 in the axial direction, the force due to the screwing of the first fixing member 60 regardless of the length of the hole 30 formed by the cylinder head 20. Is reliably added to the injector 40 via the second fixing member 70. Therefore, the injector 40 can be easily and reliably fixed to the cylinder head 20 even when the hole 30 becomes deeper corresponding to the central portion of the combustion chamber 14.

  In the first embodiment, the injector 40 is fixed to the cylinder head 20 by screw connection between the first fixing member 60 and the cylinder head 20. Therefore, by adjusting the tightening torque of the first fixing member 60, the force applied to the injector 40 sandwiched between the first fixing member 60 and the second fixing member 70 and the cylinder head 20 can be made constant. Thereby, tolerances such as a dimensional error of the injector 40 are absorbed by adjusting the tightening torque of the first fixing member 60. Therefore, the force applied to the injector 40 can be reduced to a minimum value that can correspond to the combustion pressure in the combustion chamber 14. By reducing the force applied to the injector 40, deformation of the injector 40 and the like are prevented. Therefore, changes in the fuel injection characteristics of the injector 40 can be prevented.

  In the first embodiment, the supply portion 44 of the injector 40 is accommodated on the inner peripheral side of the first fixing member 60. In addition, since the piping member 51 is fixed to the first fixing member 60 by press-fitting in advance, the injector 40 and the piping member 51 are connected together with the attachment of the first fixing member 60. Therefore, the number of assembly steps can be reduced, and the piping member 51 and the supply unit 44 of the injector 40 can be reliably connected. Further, the fuel supplied via the piping member 51 can be reliably supplied to the injector 40.

  In the first embodiment, the first fixing member 60 and the second fixing member 70 are separate bodies. Since the 1st fixing member 60 has the external thread part 61 in the outer wall, shape accuracy is requested | required. On the other hand, since the second fixing member 70 is simply inserted between the injector 40 and the cylinder head 20, high shape accuracy is not required. Therefore, in the first embodiment, a portion having a long axial length that is likely to cause a shape error is the second fixing member 70, and a portion that needs to ensure accuracy is the first fixing member 60. Thereby, the roles of the first fixing member 60 and the second fixing member 70 are shared, and the first fixing member 60 and the second fixing member 70 are formed with different accuracy. Therefore, the manufacturing man-hours and manufacturing costs of the first fixing member 60 and the second fixing member 70 can be reduced.

(Second Embodiment)
FIG. 3 shows an engine to which the injector mounting structure according to the second embodiment of the present invention is applied. In addition, the same code | symbol is attached | subjected to the component substantially the same as 1st Embodiment, and description is abbreviate | omitted.
In the second embodiment, the engine 10 includes a first fixing member 81 and a second fixing member 82. The first fixing member 81 has a male screw part 83 screwed to the female screw part 31 of the cylinder head 20 on the outer wall. The 2nd fixing member 82 has the contact part 84 which contact | connects the flange 42 of the injector 40 at the edge part on the anti-first fixing member side. The first fixing member 81 is disposed on the radially outer side of the second fixing member 82 at the end of the second fixing member 82 on the side opposite to the contact portion. Thereby, the 1st fixing member 81 has accommodated the edge part by the side of the anti-contact part of the 2nd fixing member 82 in the inner peripheral side. The first fixing member 81 is formed in a cylindrical shape and has a hole 85 into which the piping member 51 is inserted on the inner peripheral side. The second fixing member 82 is formed in a cylindrical shape, and accommodates most of the injector 40 including the supply unit 44 therein. In the second fixing member 82, the piping member 51 is press-fitted on the inner peripheral side of the end portion on the side opposite to the contact portion.

When attaching the injector 40 to the cylinder head 20, the injector 40 is inserted into the hole 30. When the injector 40 is inserted into the hole 30, the second fixing member 82 to which the piping member 51 is fixed from the supply portion 44 side of the injector 40 is installed. The supply portion 44 of the injector 40 to which the seal member 48 is attached is inserted on the inner peripheral side of the second fixing member 82.
When the second fixing member 82 is installed, the first fixing member 81 is installed outside the second fixing member 82 in the radial direction. The piping member 51 is loosely inserted into the hole 85 of the first fixing member 81. The first fixing member 81 is attached to the cylinder head 20 by fastening the male screw portion 83 to the female screw portion 31 of the cylinder head 20. At this time, the first fixing member 81 is moved toward the second fixing member 82 by screwing the first fixing member 81 into the cylinder head 20. The first fixing member 81 is in contact with the second fixing member 82. When the first fixing member 81 is further screwed after the first fixing member 81 and the second fixing member 82 are in contact with each other, the first fixing member 81 moves the flange 42 of the injector 40 to the cylinder head via the second fixing member 82. Press to 20 stepped portions 35. By adjusting the force for screwing the first fixing member 81, the force for pressing the injector 40 against the cylinder head 20 is adjusted.

  In the second embodiment, the roles of the first fixing member 81 and the second fixing member 82 are clearly divided. That is, the first fixing member 81 is a male screw portion 83 that is fastened to the female screw portion 31 of the cylinder head 20 in most of the axial direction. On the other hand, the second fixing member 82 connects the injector 40 and the piping member 51 and receives the force from the first fixing member 81 to sandwich the injector 40 with the cylinder head 20. Therefore, the axial length of the first fixing member 81 that requires machining accuracy is shortened. As the first fixing member 81 is shortened in the axial direction, it is easier to ensure accuracy and the number of processing steps is reduced. On the other hand, since the second fixing member 82 does not require shape accuracy, the second fixing member 82 can be easily processed even if the axial length is extended. Therefore, by forming the first fixing member 81 and the second fixing member 82 as in the second embodiment, the processing of the first fixing member 81 and the second fixing member 82 becomes easier, and the manufacturing man-hour and the manufacturing cost are reduced. It can be further reduced.

(Third embodiment)
FIG. 4 shows an engine to which the injector mounting structure according to the third embodiment of the present invention is applied. In addition, the same code | symbol is attached | subjected to the component substantially the same as 1st Embodiment, and description is abbreviate | omitted.
The third embodiment is a modification of the second embodiment. In the third embodiment, a first fixing member 91, a second fixing member 92, and a third fixing member 93 are provided. That is, in 3rd Embodiment, the 2nd fixing member 82 in 2nd Embodiment is divided | segmented into two in the middle of the axial direction.

The third fixing member 93 is installed between the first fixing member 91 and the second fixing member 92 in the axial direction. The third fixing member 93 is in contact with the first fixing member 91 on one end side in the axial direction. Further, the third fixing member 93 accommodates the supply part 44 of the injector 40. The first fixing member 91 has a male screw portion 94 that is fastened to the female screw portion 31 of the cylinder head 20. The second fixing member 92 has a contact portion 95 on the side opposite to the third fixing member. Therefore, when the first fixing member 91 is fastened to the cylinder head 20, the first fixing member 91 presses the injector 40 against the cylinder head 20 via the third fixing member 93 and the second fixing member.
In the third embodiment, the second fixing member 92 does not require shape accuracy as compared with the third fixing member 93. Therefore, the first fixing member 91, the second fixing member 92, and the third fixing member 93 can be processed according to the required processing accuracy. Therefore, manufacturing man-hours and manufacturing costs can be reduced.

(Fourth embodiment)
FIG. 5 shows an engine to which the injector mounting structure according to the fourth embodiment of the present invention is applied. In addition, the same code | symbol is attached | subjected to the component substantially the same as 1st Embodiment, and description is abbreviate | omitted.
In the fourth embodiment, a fixing member 160 that sandwiches the injector 40 between the piping member 52 and the cylinder head 20 is provided. The fixing member 160 is formed in a cylindrical shape having a fuel passage 161 therein. The fixing member 160 forms a fuel passage 161 and accommodates a part of the injector 40 therein. A part of the fixing member 160 in the axial direction is accommodated in the hole 30 of the cylinder head 20. One end of the fixing member 160 in the axial direction is in contact with the flange 42 of the injector 40, and the other end is inserted on the inner peripheral side of the piping member 52. Thereby, the injector 40 is pressed against the cylinder head 20 by the fixing member 160.

  The injector 40 is installed in the hole 30 of the cylinder head 20. The hole 30 penetrates the cylinder head 20 in the plate thickness direction. The hole 30 formed by the cylinder head 20 has a small diameter portion 34, a medium diameter portion 33, and a large diameter portion 32 having different inner diameters in order from the combustion chamber 14 side. Further, the cylinder head 20 has an enlarged portion 37 that is formed radially outward of the large-diameter portion 32 at the end opposite to the medium-diameter portion 33 of the large-diameter portion 32.

  The injector 40 includes a connector part 140 in addition to the nozzle 41, the flange 42, the drive part 43, the supply part 44, and the like. The connector part 140 protrudes radially outward from the drive part 43. The connector part 140 has a terminal 141 and a wiring member 142 that electrically connects the terminal 141 and a coil (not shown) of the drive part 43. The connector part 140 is integrally formed with the injector 40 by resin by inserting the terminal 141 and the wiring member 142. The connector part 140 of the injector 40 is accommodated in the enlarged part 37 of the cylinder head 20.

  In the injector 40, the supply unit 44 is located in the axial direction of the fixing member 160. A seal member 48 seals between the injector 40 and the fixing member 160. The fixing member 160 has an opening 162 through which the connector part 140 of the injector 40 penetrates radially outward. By forming the opening 162, when the fixing member 160 is installed from the side opposite to the cylinder head 20 of the injector 40, the connector portion 140 protruding from the injector 40 and the fixing member 160 do not interfere with each other. The opening 162 is located closer to the combustion chamber 14 than a portion where the seal member 48 and the fixing member 160 of the injector 40 are in contact with each other. As a result, the fuel flowing through the fuel passage 161 does not flow out of the fixed member 160.

  The fixing member 160 has a connector part 170 that is connected to the connector part 140 of the injector 40. The connector part 170 has a first coupler 171, a second coupler 172, and a body part 173. The connector 170 has a wiring member 176 that electrically connects the terminal 174 installed in the first coupler 171 and the terminal 175 installed in the second coupler 172. The first coupler 171 can be connected to a wiring unit (not shown) connected to a power source (not shown). The second coupler 172 is connected to a terminal 141 installed in the connector part 140 of the injector 40. By connecting the second coupler 172 to the terminal 141, the terminal 174 of the first coupler 171 and the coil (not shown) included in the drive unit 43 of the injector 40 are electrically connected. The body 173 is made of, for example, resin, surrounds the periphery of the fixing member 160 in the circumferential direction, and is fixed to the fixing member 160. The resin forming the body 173 is molded integrally with the fixing member 160 by inserting the terminal 174 of the first coupler 171, the terminal 175 of the second coupler 172, and the wiring member 176.

  The piping member 52 forms a fuel passage 53 inside. The end of the fixing member 160 opposite to the combustion chamber 14 is inserted inside the piping member 52. Between the fixing member 160 and the piping member 52, a sealing member 54 that seals the flow of fuel is installed. The seal member 54 prevents the fuel supplied from the piping member 52 from flowing toward the combustion chamber 14 along the outer wall of the fixed member 160. As a result, the fuel supplied from the piping member 52 flows to the supply unit 44 of the injector 40 via the inner peripheral side of the fixed member 160. The injector 40, the fixing member 160, and the piping member 52 are arranged substantially coaxially.

  A spring 180 as an elastic member is installed between the end of the piping member 52 on the combustion chamber 14 side and the fixed member 160. The spring 180 can be expanded and contracted in the axial direction, and absorbs the movement of the piping member 52 and the fixing member 160 when they relatively move in the axial direction. It is also possible to apply a force in the axial direction to the spring 180 and press the fixing member 160 toward the cylinder head 20 by the spring 180.

Next, an assembling method for assembling the injector 40 according to the fourth embodiment to the cylinder head 20 will be described.
When attaching the injector 40 to the cylinder head 20, the injector 40 is inserted into the hole 30. At this time, the connector part 140 of the injector 40 is accommodated in the enlarged part 37 of the cylinder head 20. Since the seal member 46 is attached to the nozzle 41 of the injector 40, the nozzle 41 is press-fitted into the small diameter portion 34. The injector 40 is inserted until the flange 42 comes into contact with a washer 47 installed on the step portion 35. In the fourth embodiment, the washer 47 is installed in the stepped portion 35 instead of the stepped portion 36 of the cylinder head 20. Therefore, the position of the injector 40 in the axial direction is determined by the flange 42 coming into contact with the washer 47 installed in the step portion 36.

  When the injector 40 is inserted into the hole 30, the fixing member 160 is installed on the outer peripheral side of the injector 40. The fixing member 160 is cylindrical, and is installed between the outer wall of the injector 40 and the inner wall of the cylinder head 20 that forms the hole 30. The inner diameter of the fixing member 160 is slightly larger than the outer diameter of the injector 40. In addition, the connector part 140 protruding from the injector 40 is inserted into the opening 162 of the fixing member 160. Therefore, the fixing member 160 is easily installed on the outer peripheral side of the injector 40. At this time, a contact portion 163 that is an end portion of the fixed member 160 on the combustion chamber 14 side is in contact with the flange 42 of the injector 40.

  When the fixing member 160 is installed, the piping member 52 is installed at the end of the fixing member 160 opposite to the combustion chamber 14. At this time, a spring 180 is installed between the piping member 52 and the fixing member 160. By connecting the fixing member 160 to the piping member 52, the fixing member 160 is sandwiched between the cylinder head 20 and movement in the axial direction is restricted. At this time, the injector 40 in contact with the contact portion 163 of the fixing member 160 is pressed against the cylinder head 20 by the load applied to the fixing member 160 from the piping member 52.

  By adjusting the load applied between the piping member 52 and the fixing member 160, the force for pressing the injector 40 against the cylinder head 20 is adjusted. At this time, the force by which the piping member 52 presses the injector 40 has a magnitude that can counteract the force applied to the injector 40 by the combustion gas in the combustion chamber 14. In addition, it is good also as a structure which presses the injector 40 to the cylinder head 20 using the pressing force of the spring 180. FIG.

  According to the fourth embodiment described above, the fixing member 160 is not limited to being fixed to the cylinder head 20 by screw connection, and may be fixed by being sandwiched between the piping member 52 and the cylinder head 20. At this time, the fixing member 160 is sandwiched between the piping member 52 and the cylinder head 20, whereby the injector 40 is sandwiched and fixed between the fixing member 160 and the cylinder head 20. Therefore, regardless of the depth of the hole 30, the injector 40 can be easily and reliably fixed to the cylinder head 20 as in the first embodiment.

  Moreover, in 4th Embodiment, the full length of the axial direction of the fixing member 160 can be changed easily. For example, even when the shape such as the depth of the hole 30 of the cylinder head 20 is different for each engine to which the injector 40 is applied, the design of the piping member 52 and the injector 40 is not changed by changing the shape of the fixing member 160. It is. Even when the shape of the injector 40 is changed, the design of the cylinder head 20 and the piping member 52 of the engine is not changed by changing the shape of the fixing member 160. Therefore, it is possible to easily share parts.

  In the fourth embodiment, a spring 180 is installed between the piping member 52 and the fixing member 160. The spring 180 absorbs relative movement between the piping member 52 and the fixing member 160. Thereby, the positional relationship between the piping member 52 and the fixing member 160 is kept constant. Therefore, the pressing force can be kept constant even when the shape of the injector 40 or the fixing member 160 varies due to a dimensional tolerance at the time of manufacture. Further, by keeping the pressing force constant, deformation of the injector 40 and the like are prevented. Therefore, changes in the fuel injection characteristics of the injector 40 can be prevented.

  In the above-described fourth embodiment, the configuration in which the spring 180 is installed as an elastic member between the piping member 52 and the fixing member 160 has been described. However, as shown in FIG. 6, a cylindrical member 181 made of, for example, resin or metal may be installed as the elastic member.

(Fifth embodiment)
FIG. 7 shows an engine to which the injector mounting structure according to the fifth embodiment of the present invention is applied. In addition, the same code | symbol is attached | subjected to the component substantially the same as 4th Embodiment, and description is abbreviate | omitted.
In the fifth embodiment, the piping member 150 also serves as a fixing member. That is, the piping member 150 has a fixed member integrally and is formed to extend in the axial direction toward the combustion chamber 14. Thus, the piping member 150 forms a fuel passage 151 for supplying fuel therein, and has a contact portion 152 that contacts the flange 42 of the injector 40 at the end portion on the combustion chamber 14 side. Moreover, the piping member 150 has an opening 153 into which the connector part 140 of the injector 40 is inserted. Furthermore, the piping member 150 has a connector part 170 that is connected to the connector part 140 of the injector 40.

  In the fifth embodiment, the injector 40 is sandwiched between the piping member 150 and the cylinder head 20 in which a fixing member is integrally formed. Thereby, even when installing the injector 40 in the deep hole part 30 of the cylinder head 20, while being able to install easily, the increase in a number of parts can be suppressed. Further, the structure can be simplified.

(Sixth embodiment)
An engine to which an injector mounting structure according to a sixth embodiment of the present invention is applied is shown in FIG. In addition, the same code | symbol is attached | subjected to the component substantially the same as 4th Embodiment, and description is abbreviate | omitted.
In the sixth embodiment, the injector 40 has a shoulder portion 49 that protrudes radially outward on the supply portion 44 side of the flange 42 in the axial direction. The outer diameter of the injector 40 at the shoulder 49 is substantially equal to the outer diameter of the injector 40 at the flange 42. When the shoulder portion 49 of the injector 40 protrudes radially outward, the contact portion 163 of the fixing member 160 contacts the shoulder portion 49. In the attachment structure of the injector 40 shown in FIG. 8, the spacer 190 is installed between the shoulder portion 49 of the injector 40 and the contact portion 163 of the fixing member 160. Note that the contact portion 163 of the fixing member 160 may be in direct contact with the shoulder portion 49 of the injector 40 without installing the spacer 190.

  In the sixth embodiment, the contact portion 163 of the fixing member 160 is in contact with the shoulder portion 49 of the injector 40 with the spacer 190 interposed therebetween. The shoulder portion 49 of the injector 40 is formed closer to the piping member 52 than the flange 42. As a result, the fixing member 160 contacts the injector 40 at a shallow position of the hole 30. Therefore, the total length of the fixing member 160 can be shortened, and the fixing member 160 can be easily assembled.

  In the plurality of embodiments described above, examples in which the present invention is applied to a gasoline engine have been described. However, the present invention can be applied to other engines such as a diesel engine. Moreover, although the example which applies this invention to the direct injection type gasoline engine which arrange | positions an injector in the center of a combustion chamber was demonstrated, fuel is injected into the direct injection type gasoline engine which arrange | positions an injector to the side of a cylinder, or an intake pipe The present invention may be applied to a premixed gasoline engine. Moreover, although the several embodiment demonstrated the example which divides | segments a fixing member into two or three, you may use the integral fixing member or the fixing member divided | segmented into four or more.

It is sectional drawing which shows the principal part of the engine to which the attachment structure of the injector by 1st Embodiment of this invention is applied. It is sectional drawing which shows the engine to which the attachment structure of the injector by 1st Embodiment of this invention is applied. It is sectional drawing which shows the principal part of the engine to which the attachment structure of the injector by 2nd Embodiment of this invention is applied. It is sectional drawing which shows the principal part of the engine to which the attachment structure of the injector by 3rd Embodiment of this invention is applied. It is sectional drawing which shows the principal part of the engine to which the attachment structure of the injector by 4th Embodiment of this invention is applied. It is sectional drawing which shows the principal part of the modification of the engine to which the attachment structure of the injector by 4th Embodiment of this invention is applied. It is sectional drawing which shows the principal part of the engine to which the attachment structure of the injector by 5th Embodiment of this invention is applied. It is sectional drawing which shows the principal part of the engine to which the attachment structure of the injector by 6th Embodiment of this invention is applied.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Engine (internal combustion engine), 20 Cylinder head, 23 Intake valve, 24 Exhaust valve, 30 Hole part, 31 Female thread part, 40 Injector (fuel injection valve), 45 Injection hole, 51, 52 Piping member, 54 Seal member, 60 81, 91 First fixing member, 61, 83, 94 Male thread part, 64, 151, 161 Fuel passage, 70, 82, 92 Second fixing member, 71, 84, 95, 152, 163 Contact part, 140 Connector part , 150 Piping member (fixing member), 160 Fixing member, 180 Spring (elastic member), 181 Tube member (elastic member)

Claims (17)

A fuel injection valve mounting structure for mounting a fuel injection valve that has a nozzle hole at one end and injects fuel from the nozzle hole in a hole formed by a cylinder head of an internal combustion engine,
At least a portion is installed inside the hole, and includes a fixing member that presses the fuel injection valve axially against the cylinder head,
The fixing member has a male screw portion screwed to a female screw portion provided on an inner wall of the cylinder head forming the hole portion, and the hole portion from the side opposite to the injection hole of the fuel injection valve. The fuel injection valve mounting structure is characterized in that the fuel injection valve is sandwiched between the cylinder head and the male screw portion by screwing the male screw portion to the female screw portion.   The said fixing member is formed in a cylinder shape, and has the said external thread part in the one end part of an axial direction, and the contact part which contacts the said fuel injection valve in the other end part side. The fuel injection valve mounting structure.   The fuel injection valve mounting structure according to claim 2, wherein the fixing member accommodates a pipe member through which fuel supplied to the fuel injection valve flows on one end side in the axial direction.   The fuel injection valve mounting structure according to claim 2, wherein the fixing member accommodates an end portion of the fuel injection valve on the side opposite to the injection hole on an inner peripheral side.   3. The fuel injection valve mounting structure according to claim 2, wherein the fixing member includes a first member in which the male screw portion is formed and a second member in which the contact portion is formed.   The fuel injection valve mounting structure according to claim 5, wherein the first member is disposed on the side opposite to the injection hole of the second member in the axial direction.   The fuel injection valve mounting structure according to claim 5, wherein the first member is disposed outside the second member in a radial direction. A fuel injection valve mounting structure for mounting a fuel injection valve that has a nozzle hole at one end and injects fuel from the nozzle hole in a hole formed by a cylinder head of an internal combustion engine,
At least a portion is installed inside the hole, and includes a fixing member that presses the fuel injection valve axially against the cylinder head,
The structure for mounting a fuel injection valve, wherein the fixing member has a fuel passage through which fuel supplied to the fuel injection valve flows. A pipe member through which fuel supplied to the fuel injection valve flows;
The fuel injection valve mounting structure according to claim 1, wherein the fixing member is separate from the piping member and is sandwiched between the piping member and the cylinder head.   The fuel according to claim 9, further comprising an elastic member that is installed between the piping member and the fixing member and absorbs a relative position change between the piping member and the fixing member. Injection valve mounting structure.   The fuel injection valve mounting structure according to claim 10, wherein the elastic member presses the fixing member toward the cylinder head.   The fuel injection valve mounting structure according to any one of claims 8 to 11, wherein the fixing member is formed in a cylindrical shape.   The fuel injection valve mounting structure according to claim 12, wherein the fixing member includes a seal member that is inserted inside the piping member and prevents fuel leakage between the fixing member and the piping member. A piping member for supplying fuel to the fuel injection valve;
9. The fuel injection valve mounting structure according to claim 8, wherein the fixing member is integrally connected to the piping member.   15. The cylinder head according to claim 1, wherein the cylinder head includes an intake valve and an exhaust valve, and the hole portion is disposed between the intake valve and the exhaust valve. Mounting structure of fuel injection valve. A fuel injection valve mounting method for mounting a fuel injection valve that has a nozzle hole at one end and injects fuel from the nozzle hole in a hole formed by a cylinder head of an internal combustion engine,
Inserting the fuel injection valve into the hole;
Installing a cylindrical fixing member on the outer peripheral side of the fuel injection valve inserted into the hole from the side opposite to the injection hole of the fuel injection valve;
Sandwiching the fuel injection valve between the cylinder head and the fixed member,
When the fuel injection valve is sandwiched between the cylinder head and the fixing member, a female screw portion formed on the inner wall of the cylinder head and a male screw portion formed on the outer wall of the fixing member are screwed together. A fuel injection valve mounting method characterized by the above. A fuel injection valve mounting method for mounting a fuel injection valve that has a nozzle hole at one end and injects fuel from the nozzle hole in a hole formed by a cylinder head of an internal combustion engine,
Inserting the fuel injection valve into the hole;
Installing a cylindrical fixing member on the outer peripheral side of the fuel injection valve inserted into the hole from the side opposite to the injection hole of the fuel injection valve;
Sandwiching the fuel injection valve between the cylinder head and the fixed member,
A pipe through which the fuel supplied to the fuel injection valve flows at the end of the fixing member opposite to the fuel injection valve when the fixing member is inserted into the hole from the counter injection hole side of the fuel injection valve A method for attaching a fuel injection valve, comprising installing a member.

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