JP2019178621A - engine - Google Patents

Abstract

To improve safety.SOLUTION: An engine includes: an injector 15; a fuel pipe 16 having a connection part 16c connected to one end of the injector 15; a cover member 20 which encloses the injector 15 and the connection part 16c of the fuel pipe 16; and an oil discharge hole provided at the cover member 20 and penetrating through from an inner surface of the cover member 20 to an outer surface. Even if a fuel leaks from the connection part 16c, the fuel is discharged from the oil discharge hole. Thus, the engine can control a fuel outflow direction, compared to a case where the oil discharge hole is not provided.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an engine.

  A fuel pipe is connected to one end of the injector of the engine. The fuel supplied from the fuel pipe to the injector is injected from the other end of the injector. For example, as described in Patent Document 1, a seal ring for preventing leakage of fuel is provided at a connection portion between the injector and the fuel pipe.

JP 2008-095531 A

  As described above, even if the seal ring is provided at the connection point between the injector and the fuel pipe, the fuel leaks if the injector is detached from the fuel pipe. For this reason, even if the fuel leaks, there is a demand for the development of a technique for appropriately processing the leaked fuel and improving safety.

  Then, an object of this invention is to provide the engine which can improve safety | security.

  In order to solve the above problems, an engine of the present invention is provided in an injector, a fuel pipe having a connecting portion connected to one end of the injector, a cover member surrounding the connecting portion of the injector and the fuel pipe, and the cover member. And an oil drain hole penetrating from the inner surface to the outer surface of the cover member.

  You may provide the 1st guide part provided in the downward direction of the oil drainage hole in the outer surface of a cover member, and the fuel discharged | emitted from an oil drainage hole flows.

  You may provide the 2nd guide part which is provided in the inner surface of a cover member and guides the fuel inside a cover member to an oil drain hole.

  The second guide part may be a groove or a protrusion.

  According to the present invention, safety can be improved.

It is the schematic which shows the structure of the engine of this embodiment. It is a perspective view of an injector and fuel piping. It is a figure explaining the attachment direction with respect to the intake manifold of an injector. It is the figure which extracted the connection location with an injector among fuel piping and an intake manifold, and showed it with the injector. It is a figure for demonstrating attachment of the cover member to an injector. It is the figure which extracted the connection location with an injector among fuel piping and an intake manifold, and showed with the injector to which the cover member was attached. It is an extraction figure of a coupler hole vicinity.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is a schematic diagram showing the configuration of the engine 1 of the present embodiment. As shown in FIG. 1, in the engine 1, a cylinder block 2, a cylinder head 3 provided on the top of the cylinder block 2, and a piston 5 supported by a connecting rod 4 so as to be slidable in the cylinder block 2 Is provided. A space surrounded by the cylinder block 2, the cylinder head 3, and the crown surface of the piston 5 is a combustion chamber 6.

  An intake port 7 and an exhaust port 8 are provided in the cylinder head 3 so as to communicate with the combustion chamber 6. Between the intake port 7 and the combustion chamber 6, the tip of the intake valve 9 is located, and between the exhaust port 8 and the combustion chamber 6, the tip of the exhaust valve 10 is located. The intake valve 9 has a cam 11 in contact with the other end, and opens and closes the intake port 7 and the combustion chamber 6 as the cam 11 rotates. The exhaust valve 10 is in contact with the cam 12 at the other end, and opens and closes between the exhaust port 8 and the combustion chamber 6 as the cam 12 rotates.

  The cylinder head 3 is provided with a spark plug 13 so that the tip is located in the combustion chamber 6. The spark plug 13 is ignited at a predetermined timing and burns fuel that has flowed into the combustion chamber 6. In addition, an intake passage 14 including an intake manifold is communicated with the upstream side of the intake port 7. The injector 15 injects fuel into the intake manifold of the intake passage 14.

  FIG. 2 is a perspective view of the injector 15 and the fuel pipe 16. As shown in FIG. 2, the injector 15 has a tip portion 15a. Fuel is injected from the tip 15a. Of the injector 15, a base end portion 15 b opposite to the tip end portion 15 a is connected to the fuel pipe 16.

  The fuel pipe 16 has a tubular fuel rail 16a. A fastening portion 16b is welded to the fuel rail 16a. The fastening portion 16b is, for example, a bent plate member. A through hole (not shown) is formed in the fastening portion 16b. The fastening portion 16b is fastened to the intake manifold by a bolt inserted through the through hole.

  Two connecting portions 16c are provided on the fuel rail 16a. The connecting part 16c is tubular. One end of the connecting portion 16c is connected to the fuel rail 16a, and the inside of the connecting portion 16c communicates with the inside of the fuel rail 16a. The other end of the connecting portion 16c is open, and the base end portion 15b of the injector 15 is inserted and connected.

  Here, the case where two injectors 15 are connected to the fuel pipe 16 has been described, but the number of injectors 15 connected to the fuel pipe 16 may be one or three or more.

  One end of the injector 15 on the base end portion 15b side is open. The fuel supplied to the fuel pipe 16 flows into the injector 15 from the opening at one end of the injector 15. A plunger (not shown) is provided inside the injector 15. The injector 15 injects fuel into the intake manifold 17 from the other end on the distal end portion 15a side when the plunger moves. The fuel is guided to the combustion chamber 6 through the intake port 7 together with the intake air and burned.

  FIG. 3 is a view for explaining the mounting direction of the injector 15 with respect to the intake manifold 17. In FIG. 3, the upward direction is vertically upward, and the downward direction is vertically downward. In FIG. 3, the intake manifold 17 is indicated by a two-dot chain line. The intake manifold 17 forms a part of the intake passage 14 described above. An end 17 a of the intake manifold 17 is connected to the intake port 7 of the cylinder head 3.

  The tip 15 a of the injector 15 is inserted into the intake manifold 17. The distal end portion 15 a is directed toward the end portion 17 a (intake port 7 side) inside the intake manifold 17.

  FIG. 4 is a view showing a connection portion with the injector 15 extracted from the fuel pipe 16 and the intake manifold 17 and shown together with the injector 15. In FIG. 4, a part of the connecting portion 16 c of the fuel pipe 16 and the intake manifold 17 are shown in a sectional view.

  As shown in FIG. 4A, a seal ring Sa is provided between the connecting portion 16 c of the fuel pipe 16 and the outer peripheral surface 15 c on the base end portion 15 b side of the injector 15. A seal groove 15 d is formed on the outer peripheral surface 15 c on the base end portion 15 b side of the injector 15. The seal ring Sa is attached to the seal groove 15d, for example.

  The intake manifold 17 is formed with a mounting hole 17b. The mounting hole 17b penetrates from the inner peripheral surface of the intake manifold 17 to the outer peripheral surface 17c. A large inner diameter portion 17d is formed in the opening on the outer peripheral surface 17c side of the mounting hole 17b. The large inner diameter portion 17d has a larger inner diameter than the portion on the inner peripheral surface side in the mounting hole 17b.

  A seal ring Sb is provided between the outer peripheral surface 15c on the tip end 15a side of the injector 15 and the large inner diameter portion 17d. The seal ring Sb is attached to the inner peripheral surface of the large inner diameter portion 17d, for example.

  For example, when the pressure inside the intake manifold 17 becomes high due to the influence of backfire or the like, the seal ring Sb may be pushed out from the mounting hole 17b. As the seal ring Sb moves, the injector 15 is inserted deeply into the mounting hole 17b as indicated by the white arrow in FIG. 4B. As a result, the seal ring Sa is detached from the connecting portion 16 c of the fuel pipe 16. Therefore, the fuel in the fuel pipe 16 leaks through the gap between the connecting portion 16 c and the outer peripheral surface 15 c on the base end portion 15 b side of the injector 15.

  FIG. 5 is a view for explaining attachment of the cover member 20 to the injector 15. As shown in FIG.5 (b), the cover member 20 is resin, for example. The cover member 20 has a generally bowl-shaped main body 21. The main body 21 surrounds the injector 15 and the connecting portion 16 c of the fuel pipe 16.

  As shown in FIG. 5A, the main body 21 includes a first main body 21a and a second main body 21b. The main body portion 21 is formed by combining a first main body portion 21a and a second main body portion 21b. That is, the main body 21 can be divided into two parts, a first main body 21a and a second main body 21b.

  The injector 15 is provided with a coupler portion 15e. The coupler portion 15 e protrudes from the outer peripheral surface 15 c of the injector 15. A connect pin 15f is accommodated in the coupler portion 15e. The plunger is moved by the electric power supplied from the external power source via the connect pin 15f.

  A coupler hole 21 c is formed in the main body 21. The coupler hole 21c penetrates from the inner peripheral surface 21d (inner surface) of the main body 21 to the outer peripheral surface 21e (outer surface). As shown in FIG. 5A, in a state where the first main body portion 21a and the second main body portion 21b are separated, the coupler hole 21c is divided into opposing grooves 21f that are opposite to each other. That is, the coupler hole 21c is formed at the boundary between the first main body portion 21a and the second main body portion 21b. Therefore, as shown in FIG. 5B, the first main body portion 21a and the second main body portion 21b can be assembled to the injector 15 with the coupler portion 15e interposed therebetween.

  A first guide portion 21 g is provided on the outer peripheral surface 21 e of the main body portion 21. In FIG. 5, the injector 15 is shown in a direction parallel to the vertical direction in FIG. 5, but as shown in FIG. 3, the injector 15 is inclined with respect to the vertical direction. The first guide portion 21g is located vertically below the coupler hole 21c.

  The first guide portion 21g is integrally formed with the second main body portion 21b. However, the first guide portion 21g may be integrally formed with the first main body portion 21a, or may be molded separately and attached to the main body portion 21.

  The first guide portion 21g is a so-called scissor, and has, for example, a generally U-shaped cross section perpendicular to the longitudinal direction. That is, the first guide portion 21g has a groove that is recessed vertically downward. 21 g of 1st guide parts form the flow path which the vertical upper part opened.

  A second guide portion 21 h is provided on the inner peripheral surface 21 d of the main body portion 21. The 2nd guide part 21h is comprised by the processus | protrusion which protrudes from 21d of inner peripheral surfaces, for example. The second guide portion 21h extends spirally from the proximal end portion 15b side of the injector 15 toward the distal end portion 15a side along the inner peripheral surface 21d.

  A mounting groove 21k is formed on the outer peripheral surface 21e of the main body 21. The mounting groove 21k is located closer to the one end 21m side (the tip 15a side of the injector 15) than the coupler hole 21c. The mounting groove 21k extends over the entire circumference of the outer peripheral surface 21e. After the first main body portion 21 a and the second main body portion 21 b are combined, the one end portion 21 m of the main body portion 21 is inserted into the attachment ring 22. Then, the attachment ring 22 is fitted into the attachment groove 21k. The first main body portion 21 a and the second main body portion 21 b are integrated by the attachment ring 22.

  The mounting groove 21k prevents the mounting ring 22 from dropping off. Here, the case where the mounting groove 21k is provided has been described. However, instead of the mounting groove 21k, for example, an annular protrusion protruding obliquely toward the other end 21n side of the main body 21 is provided on the outer peripheral surface 21e. It may be formed.

  FIG. 6 is a view showing a connection portion of the fuel pipe 16 and the intake manifold 17 with the injector 15 together with the injector 15 to which the cover member 20 is attached. In FIG. 6, a part of the connecting portion 16 c of the fuel pipe 16, the intake manifold 17, and the cover member 20 are shown in a sectional view. In FIG. 6, the first guide portion 21g and the second guide portion 21h are not shown.

  As shown in FIG. 6, in the main body portion 21 of the cover member 20, the inner peripheral surface of the coupler hole 21 c faces the coupler portion 15 e in the central axis direction of the injector 15. Further, in the main body portion 21, one end portion 21 m on the fuel pipe 16 side faces the connecting portion 16 c of the fuel pipe 16 in the central axis direction of the injector 15. Therefore, the main body 21 is positioned with respect to the central axis direction of the injector 15.

  An opening 21p is formed on the one end 21m side of the main body 21. The opening 21p is closed by contacting the outer peripheral surface of the connecting portion 16c of the fuel pipe 16 in the radial direction. An opening 21q is formed on the other end 21n side of the main body 21. The opening 21q is closed by contacting the outer peripheral surface 17c of the intake manifold 17 in the central axis direction of the injector 15.

  For this reason, the inside of the main body 21 is communicated with the outside only through the coupler hole 21c. As described above, when the fuel in the fuel pipe 16 leaks through the gap between the connecting portion 16c and the outer peripheral surface 15c on the base end portion 15b side of the injector 15, the fuel is separated from the cover member 20, the injector 15 and And is discharged from the coupler hole 21c to the outside.

  Thus, the coupler hole 21c functions as an oil drain hole for discharging fuel. The safety of the engine 1 is improved by opening the coupler hole 21c in such a direction that the safety is not impaired even if the fuel flows out. Although the case where the oil drain hole is the coupler hole 21c has been described here, the oil drain hole may be formed separately from the coupler hole 21c.

  Further, as shown in FIG. 5B, by providing the first guide portion 21g, it is possible to guide the direction in which the fuel discharged from the coupler hole 21c flows down in a safer direction. As shown in FIGS. 5A and 5B, by providing the second guide portion 21h, the flow of fuel is not easily disturbed inside the cover member 20, and is easily guided to the coupler hole 21c.

  FIG. 7 is an extraction diagram in the vicinity of the coupler hole 21c. In FIG. 7, the illustration of the coupler unit 15e is omitted. As shown in FIG. 7, the second guide portion 21h is located in the vicinity of the upper part of the coupler hole 21c. Since the so-called labyrinth structure is formed by the second guide portion 21h, it is difficult for the fuel to be vigorously discharged from the coupler hole 21c. As a result, the fuel whose flow is suppressed tends to flow out from the coupler hole 21c toward the intended direction (for example, toward the first guide portion 21g).

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Is done.

  For example, in the above-described embodiment, the case where the first guide portion 21g is provided has been described, but the first guide portion 21g is not an essential configuration.

  Moreover, although embodiment mentioned above demonstrated the case where the 2nd guide part 21h was provided, the 2nd guide part 21h is not an essential structure. Moreover, the 2nd guide part 21h is not restricted to a protrusion, For example, you may be comprised with a groove | channel.

  In the above-described embodiment, the case where the main body portion 21 of the cover member 20 is generally tubular has been described. However, the main body portion 21 may have a hollow prismatic shape or other shapes. .

  The present invention can be used for an engine.

1 Engine 15 Injector 16 Fuel piping 16c Connecting portion 20 Cover member 21c Coupler hole (oil drain hole)
21d Inner peripheral surface (inner surface)
21e Outer peripheral surface (outer surface)
21g 1st guide part 21h 2nd guide part

Claims (4)

An injector,
A fuel pipe having a connecting portion connected to one end of the injector;
A cover member surrounding a connecting portion of the injector and the fuel pipe;
An oil drain hole provided in the cover member and penetrating from the inner surface to the outer surface of the cover member;
An engine equipped with. 2. The engine according to claim 1, further comprising: a first guide portion that is provided below the oil discharge hole on the outer surface of the cover member and through which fuel discharged from the oil discharge hole flows. The engine according to claim 1, further comprising a second guide portion that is provided on an inner surface of the cover member and guides fuel inside the cover member to the oil drain hole.   The engine according to claim 3, wherein the second guide portion is a groove or a protrusion.

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