JP6389813B2 - Rotation restricting member and assembly. - Google Patents

Description

  The present invention relates to a rotation restricting member mounted on a fuel injection device and an assembly thereof.

  In recent years, in order to improve fuel consumption and reduce harmful exhaust gas components, development / improvement of in-cylinder injection gasoline engines in which an injector for injecting fuel into a fuel chamber is provided for each cylinder has been promoted. In a direct injection engine, it is common to mount the injector directly on the engine. However, in this method, there is a problem that the noise generated by the engine is large. The idea to lower (Patent Document 1) has come out. In response to the idea, a method of suspending an injector with a metal member on a fuel pipe (Patent Document 2) has been realized, and an engine with reduced noise has been made. Further, a mechanism of a form in which further improvement has been proposed for the suspension method has been proposed. (Patent Document 3).

US2008 / 0053409 US7406946 US8646464

  Currently, the injector is suspended from the rail and held, and the rotation direction of the injector is regulated by using a regulating member to determine the rotation direction of the injector by aligning the groove made in the fuel pipe with the groove of the injector. Yes. However, due to the shape of this restricting member, it may be difficult to install the injector depending on the engine design, and it is necessary to groove the fuel pipe only to restrict the rotation of the injector. Since it becomes necessary to make a groove, it is a factor of cost increase.

  The present invention has been made in view of the above situation, and even in an engine having a severe layout restriction, it can be connected, and a cost reduction can be expected by not manufacturing groove processing in the injector cup and the injector. An object of the present invention is to provide a mechanism for regulating the rotation direction of the injector.

  According to a first aspect of the present invention, there is provided a rotation restricting member for restricting the rotation of the injector, wherein an axial restricting member is attached to the injector, and the axial restricting member is inserted into an injector cup provided in a fuel supply passage. An insertion hole is formed, and the injector and the axial direction restricting member are combined with the insertion hole to perform axial restriction, and the rotation restricting member is a part of the insertion hole when viewed from the axial direction. A rotation restricting member characterized by having protrusions having the same shape is described.

  The rotation restricting member described in the present embodiment has a shape that can be connected even to an engine that has severe layout restrictions. Further, it is possible to provide a mechanism for regulating the rotation direction of the injector that can reduce the cost by not manufacturing the groove processing in the injector cup and the injector.

The principal part perspective view of the fuel piping assembly which concerns on 1st Embodiment. FIG. 3 is an exploded perspective view of the fuel pipe assembly according to the first embodiment. Bottom perspective view of injector cup Vertical section of injector cup Overall view of the injector Enlarged view of the upstream side of the injector Axial displacement regulating member Rotation restricting member of the present invention Rotation restricting member of the present invention (different perspective view) Cross section of upstream side of injector

  Hereinafter, an embodiment of a rotation stopping mechanism of a fuel pipe assembly for a direct injection engine to which the present invention is applied will be described with reference to FIGS. 1 to 10.

  FIG. 1 shows a perspective view of a main part of the fuel pipe assembly according to the first embodiment, and FIG. 2 shows an exploded perspective view of the fuel pipe assembly according to the first embodiment. FIG. 5 shows the rotation restricting member 6 in this embodiment, and FIG. 6 shows a view from a different viewpoint.

  The rotation restricting member 6 in the present embodiment is a rotation restricting member 6 that restricts the rotation of the injector 4. The axial restricting member 5 is attached to the injector 4, and the injector cup 3 provided on the common rail 2 is axially attached to the injector cup 3. An insertion hole 14 into which the restriction member 5 is inserted is formed, and the injector 4 and the axial direction restriction member 5 are combined with the insertion hole 14 to restrict the axial direction. The rotation restriction member 6 is formed from the axial direction. When viewed, it has a protrusion 16 having the same shape as a part of the insertion hole 14. A disassembled view of the rotation restricting member 6 described in the present embodiment is shown in FIG. The injector 4 is arranged so as to be suspended from the injector cup 3.

  Further, as shown in FIG. 2, the fuel is circulated to the injector 4 connected to the injector cup 3 through the common rail 2, the injector cup 3, and the fuel from an injection hole provided at the tip of the injector 4 (not shown). Fuel is injected into the combustion chamber and burned. In the present embodiment, the rotation restricting member 6 for preventing the rotation of the injector 4 and the injector cup will be described in detail.

  As shown in FIG. 5, when the rotation restricting member 6 has a protrusion 16 having the same shape as a part of the insertion hole 14 of the injector cup 3 when viewed from the axial direction (upper part of the injector cup), Can be controlled. The conventional rotation restricting member has a problem that it is necessary to provide a groove in the injector cup 3 itself, which increases the cost, but by providing the protrusion 16 that fits with the shape originally provided in the injector cup 3, Since the original shape can be utilized, it is not necessary to provide a new groove. Therefore, the processing cost can be reduced.

  As described above, the rotation restricting member 6 in this embodiment restricts the rotation of the injector 4 inside the injector cup 3. In the case of the rotation restricting member 6 described in Patent Document 1, there arises a problem that it is necessary to provide a groove in the injector cup 3 by an additional process. In addition, it is possible to firmly fix the injector cup 3 by incorporating the rotation restricting member 6 into the notch provided in the additional work. However, once it is attached, it is firmly fixed so that it cannot be detached. It was. However, in the case of the rotation restricting member 6, it can be fixed so as to be detachable by not performing groove processing or by using the surface originally provided inside the injector cup 3 as the rotation restricting surface. Thereby, when actually replacing the injector 4, it is possible to simplify the work of detaching the injector 4 from the injector cup 3. In addition, in the conventional product, since the rotation restricting member 6 protrudes from the injector 4 itself by providing a groove in the injector cup 3 and causing the rotation restricting member 6 to bite, the injector cup and the injector are actually attached to the common rail 2. At the time, there was a problem that some types could not be attached. However, since rotation can be restricted inside the injector cup 3, various types of common rails 2 and injector cups 3 can be mounted.

  Further, the rotation restricting member 6 in the present embodiment restricts the rotation of the injector 4 inside the outer periphery of the injector cup 3.

  Various parts are closely arranged in the engine, and the rotation restricting member protrudes to increase the area occupied by the injector 4 in the engine, resulting in a clearance problem in the engine. However, by using the rotation restricting member 6 described in the present embodiment, it becomes possible to restrict the rotation inside the injector cup 3, so the problem of clearance in the engine is solved.

  Further, the protrusion 16 of the rotation restricting member 6 is characterized by restricting the rotation of the injector 4 by fitting with a part of the insertion hole 14 having the same shape as the protrusion 16. As described above, the rotation restricting member 6 in the present embodiment has the protruding portion 16, and the protruding portion 16 is designed to be fitted with a part of the insertion hole 14 of the injector cup 3. Since it can be used by changing the shape of the protrusion 16 to the structure originally possessed by the insertion hole 14, the versatility is high. The structure of the protrusion will be described in detail later.

  The rotation restricting member 6 is configured to be connected to the projecting portion 16 and includes elastic portions 17 and 18 having elasticity. The elastic portions 17 and 18 are moved in the axial direction of the injector 4. In this case, the protrusion 16 is moved in the same direction correspondingly. As described above, it is very difficult to remove the injector in which the rotation restricting member is connected to the conventional injector cup, and there is a problem that the work when the injector 4 needs to be actually replaced is difficult. Therefore, the rotation restricting member 6 described in the present embodiment includes elastic portions 17 and 18 having elasticity at the lower portion of the protrusion 16 described above. With this configuration, the protrusions 16 can be easily attached and detached by detaching from the part of the insertion hole 14 fitted so far by pushing the elastic parts 17 and 18 downward with a finger or the like. . The pressing force is only enough to be pressed with a finger. Further, it is possible to expect an effect that the elastic portions 17 and 18 can buffer an impact even when the engine vibrates.

  In addition, the elastic portions 17 and 18 are provided between the contact portion 17 that contacts the lower surface of the injector cup 3 and the lower surface of the injector cup 3 in a state where the protruding portion 16 is fitted with a part of the insertion hole 14. A non-contact portion 18 in which a space is formed is formed. As described above, the elastic portions 17 and 18 are provided following the protrusion 16. As described above, the elastic portions 17 and 18 include the contact portion 17 that comes into contact with the lower surface of the injector cup 3 and the non-contact portion 18 that is not in contact and is formed one step below the contact portion. A protrusion 16 is provided immediately above the contact portion. As described above, it is possible to push down the contact portion 17 and the projecting portion 16 that are continuously constructed by pushing down the non-contact portion 18 of the elastic portion downward. As a result, the injector cup 3 and the injector 4 can be removed by detaching from a part of the insertion hole 14 of the injector cup 3 that was originally fitted with the protrusion 16.

  Further, the protrusion 16 is composed of a plurality of planes, and the outer peripheral surfaces of the plurality of planes are arranged so as to have an angle corresponding to the part of the insertion hole 14. As shown in FIG. 6, the protrusion 16 is composed of a plurality of planes. With this configuration, the plurality of planes of the protrusion 16 have a plurality of corners corresponding to the number of the planes. As shown in FIG. 3, since this corner portion is also provided in a part of the insertion hole 14 provided in the injector cup 3, when the injector 4 is about to rotate, Become. As a result, even if only the protrusion 16 of the rotation restricting member 6 is in contact with the inside of the injector cup 3, the restriction in the radial direction is possible.

  A bottom surface 23 that contacts the upper portion 22 of the housing of the injector 4 is provided, and the bottom surface 23 is configured to exist on the downstream side of the contact portion. The rotation restricting member 6 has a role of fixing three points of the injector cup 3 and the injector 4. The rotation restricting member 6 needs to be fixed to the injector 4. Therefore, the rotation restricting member 6 is designed so as to have a bottom surface 23 that comes into contact with a flat surface originally present on the housing upper portion 22 of the injector 4. Further, the bottom surface 23 is configured to exist on the downstream side of the contact portion described above. With this configuration, the injector cup 3 and the injector 4 can be fixed via the rotation restricting member 6.

  The bottom face 23 in contact with the upper part 22 of the housing and the contact part having the protrusion 16 are connected via a cylindrical part continuing in the radial direction. As shown in FIG. 2B and FIG. 7, the bottom surface 23 is configured so as to be in contact with a plane provided on the upper portion 22 of the housing. Specifically, however, the rotation in the radial direction cannot be restricted even if the bottom surface 23 contacts the flat surface 22 at the top of the housing. Therefore, the rotation restricting member 6 is provided with a cylindrical portion so as to connect the bottom surface 23 and the contact portion 17. In the injector 4, a flat surface portion 10 and a cylindrical portion 28 are provided in a resin portion following the housing upper portion 22 of the injector 4. Similarly, the rotation restricting member 6 is provided with a plane portion and a cylindrical portion. By doing so, not only the bottom surface provided on the housing upper part 22 of the injector 4 but also the plane part 19 and the cylindrical part 20 have the same shape, the injector 4 and the injector cup 3 are fixed.

    The protrusion 16 provided in the rotation restricting member 6 is formed so as to be rotated and fitted after the injector 4 is inserted into the insertion hole 14. The method for mounting the rotation restricting member 6 will be described. First, as shown in FIG. 2B, the axial direction regulating member 5 is attached to the injector 4. Specifically, as shown in FIG. 8, the injector body is provided with a groove 10 having a flat surface portion 10 and a curved surface portion 9, and locking portions at the upper portion 7 and the lower portion thereof. Further, the axial direction regulating member 6 has a structure as shown in FIG. The height of the axial restricting member 6 is equal to the height of the groove 10 provided in the injector body, and the portion fitted in the groove corresponds to the flat surface portion 9 and the curved surface portion 10 formed in the injector 4. Is provided. The axial direction regulating member 6 is mounted so as to fit in the groove 10 provided in the injector 4. The injector 4 is inserted into an insertion hole 14 provided on the inner surface of the injector cup 3 shown in FIG. As shown in FIG. 4, the insertion hole 14 has a triangular shape. The axial direction regulating member 5 also has a triangular shape as shown in FIG. By rotating about 60 degrees so that the apex of the triangle formed by the axial direction regulating member 5 is located at the side of the triangle of the insertion hole 5, it can be suspended from the engaging portion of the injector cup 3. With this configuration, the axial displacement of the injector 4 can be restricted. However, the radial displacement cannot be restricted by this configuration alone. Therefore, it is necessary to mount the rotation restricting member 6. As described above, the bottom surface 23 of the rotation restricting member 6 is mounted on the housing upper portion 22 of the injector 4 while pressing the non-contact portion 18 provided in the rotation restricting member 6 with a finger or the like. Thereafter, when the finger is released from the non-contact portion 18, the protruding portion 16 is disposed so as to fit into a plurality of planes provided in a part of the injector cup 3. As a result, as shown in FIG. 1, it is disposed between the injector 4 and the injector cup 3. Thereby, the rotation restricting member 6 is mounted between the injector 4 and the injector cup 3 and can restrict the rotation.

  Only the protrusion 16 is in contact with the inside of the injector cup 3. With this configuration, as described above, there is an effect that it can be attached and detached simply by pressing the non-contact portion 18 formed continuously with the protrusion 16 downward. It is enough to push the non-contact part downward with a finger. Moreover, as shown in FIG. 4, since it contacts only the inside of the injector cup 3, the effect of solving the clearance problem without protruding to other parts is shown.

  The rotation restricting member 6 is mounted on the housing upper part 22 of the injector 4, is inserted into the injector cup 3, and rotates so that the protrusion 16 and the insertion hole 14 are engaged with each other. As described above, the injector 4 is inserted into the injector cup 3, and part of the insertion hole provided in the injector cup 3 and the protrusion 16 of the rotation restricting member 6 are engaged to restrict the rotation in the radial direction. Further, since the protrusion 16 can be displaced in the vertical direction by the non-contact portion 18, there is an effect that the rotation restricting member 6 can be easily detached from the injector 4 and the injector cup 3.

  A bottom surface 23 of the rotation restricting member is mounted so as to be in contact with the housing upper portion 22 of the injector 4, and the injector 4 to which the rotation restricting member 6 is mounted is inserted into the injector cup 3 and is attached to the rotation restricting member 6. The provided projection 16 is fitted to a part of the insertion hole 14 by rotating to a part of the insertion hole 14 while contacting the inner peripheral surface of the insertion hole 14. To do. As described above, there is a method of assembling the injector cup 3 and the injector 4 and restricting the rotation in the axial direction, and then mounting the rotation restricting member 6, but there are other methods as well. First, the axial restriction member 5 is attached to the injector 4. Thereafter, the rotation restricting member 6 is mounted so that the bottom surface 23 of the rotation restricting member 6 is in contact with the flat surface 22 in the housing upper part 22. The injector 4 fitted with the axial restriction member 5 and the rotation restriction member 6 is attached to the injector cup 3 while pushing the non-contact portion 18 of the rotation restriction member 6 downward with a finger or the like, and the protrusion 16 of the rotation restriction member is formed. After rotating to a position that fits in part of the insertion hole 14, the finger or the like is released from the non-contact portion 18. As a result, the rotation restricting member 6 can be mounted inside the injector 4 and the injector 4. Moreover, also when detaching | desorbing, it can remove | desorb easily by removing, pressing the non-contact part 18 of the rotation control member 6. FIG.

  The injector 4 with the axial displacement restricting member 5 attached is inserted into the injector cup 3 and rotated to restrict the axial movement of the injector 4, and the rotation restricting member 6 is attached to the injector 4. It is mounted, and the rotation is restricted by fitting the protrusion 16 into the insertion hole 14. As described above, the axial direction regulating member 5 is attached to the injector 4 and the insertion hole 14 has a triangular shape as shown in FIG. The axial direction restricting member 5 also has a triangular shape as shown in FIG. By rotating about 60 degrees so that the apex of the triangle formed by the axial direction regulating member 5 is located at the side of the triangle of the insertion hole 14, it can be suspended from the engaging portion of the injector cup 3. However, this only restricts movement in the axial direction. Therefore, the rotation restricting member 6 is used as described in the present embodiment. A part of the insertion hole 14 originally designed for the protrusion 16 of the rotation restricting member 6 and the injector cup 3 is fitted, whereby the radial rotation can be restricted. Thus, the injector cup 3 and the injector 4 are fixed by combining the axial direction restricting member 5 and the rotation restricting member 6.

  As described above, according to the rotation restricting member 6 according to the present invention, the injector 4 and the injector cup 3 can be fixed using the rotation restricting member 6 and connected to a common rail adapted to the structure. In addition, since it is fixed at the clearance or the inner circumference of the injector cup, it can be applied to any common rail and injector cup.

  Since the rotation of the suspension type injector is restricted as in the prior art, it is not necessary to make a groove in the injector cup itself, and it is possible to reduce the cost and simplify the operation.

  When a conventional rotation restricting member is used, it is necessary to form a groove for allowing the rotation restricting member to bite into the injector cup and a groove for incorporating the rotation restricting member into the injector body. However, these two grooves need not be formed by using the rotation restricting member described in the present embodiment, and cost reduction can be expected.

  In summary, since the shape of the injector cup and the original structure of the injector is utilized, no special design change is required. In addition, the merit that attachment and removal can be simplified can be obtained.

  Although the description of the examples is finished as described above, the present invention is not limited to the above-described embodiment, and can be widely modified and implemented. For example, in the above-described embodiment, the present invention is applied to a fuel pipe assembly for a direct injection engine. However, the present invention may be applied to a fuel pipe assembly for a port injection engine, a fuel injection assembly for a diesel engine, or the like. You may apply. Further, the axial direction displacement restricting means and the circumferential direction displacement restricting means attached to the engaging portion and the injector formed in the axial direction restricting member 5 are not limited to the examples in the above embodiment.

DESCRIPTION OF SYMBOLS 1 Fuel piping assembly 2 Fuel piping 3 Injector cup 4 Injector 5 Axial direction restricting member 6 Rotation restricting member 7 Locking part 8 of flange part 4 Rotation stop groove of circular part 104 of flange part 94 of 4 Groove flat portion 113, locking portion 125, bottom surface portion 134, connector side surface portion 14, insertion hole shape 153, outer diameter surface 166, projection portion 176, spring portion 186, vertical movement pressing surface 194 of 6 rotation-stop regulating surface 204 in contact with 13 of cylinder 6 of cylindrical surface 213 in contact with cylindrical portion 28 of housing 224 of upper surface portion 23 of housing 4 of bottom surface portion 24 of housing 6 Resin on the outside of the adapter 304 of the inner part of the cylindrical portion 294 of the upper portion of the housing of the flat surface 284 of the fifth plane 284 in contact with the flat surface portion 10 of the fifth cylindrical surface 274 in contact with the cylindrical surface 9 of the upper surface portion 264 of the fifth surface in contact with Part

Claims (12)

A rotation regulating member for regulating the rotation of the injector,
An axial restriction member is attached to the injector,
An insertion hole into which the axial direction regulating member is inserted is formed in an injector cup provided in the fuel supply passage,
The injector and the axial restriction member are combined with the insertion hole, and axial restriction is performed.
The rotation restricting member has a protrusion having the same shape as a part of the insertion hole when viewed from the axial direction. The rotation restricting member according to claim 1,
A rotation restricting member for restricting rotation of the injector inside the injector cup. The rotation restricting member according to claim 2,
An elastic part that is connected to the protrusion and has elasticity,
The said elastic part is comprised so that the said protrusion part may be moved to the same direction corresponding to this, when the said elastic part moves to the axial direction of the said injector, The rotation control member characterized by the above-mentioned. The rotation restricting member according to claim 3,
The elastic portion is a non-contact in which a space is formed between a contact portion that is in contact with the lower surface of the injector cup and a lower surface of the injector cup in a state where the protrusion is fitted with a part of the insertion hole. And a rotation restricting member. The rotation restricting member according to claim 4,
The protrusion is composed of a plurality of planes,
The rotation restricting member, wherein the outer peripheral surfaces of the plurality of flat surfaces are arranged so as to have an angle corresponding to the part of the insertion hole. In the rotation restricting member according to claim 5,
A rotation restricting member comprising a bottom surface in contact with an upper portion of the housing of the injector, wherein the bottom surface is located on a downstream side of the contact portion. The rotation restricting member according to claim 6,
The bottom surface in contact with the upper part of the housing, and the contact portion having the protrusion,
A rotation restricting member connected through a cylindrical portion extending in a radial direction. In the rotation restricting member according to any one of claims 1 to 7,
The rotation restricting member, wherein the protrusion is formed to rotate and fit after the injector is inserted into the insertion hole. In the rotation restricting member according to any one of claims 1 to 8,
The rotation restricting member is mounted on an upper portion of the housing of the injector, inserted into the injector cup, and rotated so that the protrusion and the insertion hole are engaged with each other. In the rotation restricting member according to any one of claims 1 to 9,
The bottom surface is mounted so as to contact the top of the injector housing;
The injector equipped with the rotation restricting member is inserted into the injector cup,
The rotation restricting member, wherein the protrusion provided on the rotation restricting member engages with a part of the insertion hole in a state of being in contact with the inner peripheral surface of the insertion hole.   An injector comprising the rotation restricting member according to any one of claims 1 to 10.   An assembly comprising the injector according to claim 11 and the injector cup.

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