JP4325829B2 - Fuel piping structure of fuel injection engine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fuel pipe structure for supplying fuel to a fuel injection type engine, and more particularly to a simplified connection between a fuel pipe and an injector.
[0002]
[Prior art]
An injector in a fuel injection type engine is inserted into a connection hole that leads to an intake passage on the injection port side, and is fixed to the engine side by a separate holder, and fuel is supplied from a fuel pump through a fuel pipe connected to the holder. It has become so. In addition, some of the fuel pipes are made of a rigid metal at the injector connection part, and this part is fixed to the engine side so that a part of the fuel pipe also serves as a holder (for example, Japanese Utility Model Laid-Open No. 61-36176). No., JP-A-3-149313).
[0003]
[Problems to be solved by the invention]
By the way, since the conventional injector needs to be fixed to the engine side by the holder, the holder must be fixed to the engine side by an appropriate fixing means such as a clip or a bolt after the holder is attached to the injector. Since the number of man-hours and the number of parts increase, it has been demanded to reduce these and simplify the connection of the fuel pipe. This point was the same even when a holder function was also used for a part of the fuel pipe. Accordingly, the present invention aims to realize these requirements .
[0004]
[Means for Solving the Problems]
In order to solve the above problems, a fuel piping structure for a fuel injection engine according to claim 1 is a fuel piping for a fuel injection engine for supplying fuel from a fuel pump to an injector attached to an intake passage of the engine via a fuel pipe. In structure
The injector is directly fixed to the intake passage side, and a quick connector (30) for connecting to the injector is provided at least on the injector connection side end of the fuel pipe, and the quick connector (30) is put on the injector. As well as fixing it directly,
The quick connector (30) includes a housing (31) that is substantially V-shaped by a tube side connection portion (32) to which one end of a fuel pipe is connected and a portion in which an injector is fitted.
The fuel pipe is made of a resin tube, extends from a fuel tank along a body frame of a motorcycle or the like, and is integrally connected to the tube side connection portion (32) of the housing.
The injector is characterized in that a joint part (50) that fits into the housing (31) is integrally formed to protrude, and the quick connector (30) is put on the joint part (50) to directly prevent it from being detached. .
[0006]
【The invention's effect】
According to the first aspect of the present invention, the holder that has been conventionally required can be omitted by directly fixing the injector to the intake passage side, and the quick connector provided at at least one end of the fuel pipe can be prevented from being removed. Fixed and can be directly coupled with the injector. For this reason, the connection between the fuel pipe and the injector is simplified, and the assembling man-hours for fixing the holder to the engine side and the fixing members such as bolts and clips are unnecessary, so that the assembling man-hours and the number of parts can be reduced. As a result, costs can be reduced.
[0007]
In this case, it can be connected to the injector at the one-touch type by quick connector.
[0008]
Also, since the forming protrusions for retaining means engaging the quick connector in the joint portion of the Lee Njekuta can allow the connection of the one-touch.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment applied to a motorcycle will be described with reference to the drawings. Note that the directions such as up and down and left and right used in the following description are based on the illustrated state corresponding to the description, and the front and rear direction is based on the traveling direction of the vehicle in the used state. FIG. 1 is a view showing a side surface of a main part of a motorcycle to which the present invention is applied. A body frame is a main frame 1 arranged in the front-rear direction and a pivot plate 2 arranged in the up-down direction at the rear end. And a rear rail 4 extending diagonally upward from the middle portion of the main frame 1 and a rear frame 4 extending diagonally upward from the upper end of the pivot plate 2 and connected to the seat rail 3.
[0010]
A head pipe 5 is integrally provided at the front end of the main frame 1, and a steering shaft (not shown) is rotatably supported here. An air cleaner 6 is suspended and supported near the head pipe 5 at the front portion of the main frame 1, and an air-cooled four-cycle engine 7 is suspended and supported via a hanger 8 behind the air cleaner 6. The engine 7 is supported by the mount portion 9 of the pivot plate 2 at the rear end portion.
[0011]
The pivot plate 2 is provided with a pivot 10 on which a front end of a rear swing arm 11 is pivotally supported, and a rear wheel (not shown) is supported at the rear end. A fuel tank 12 is supported on the seat rail 3. The fuel tank 12 is a downward projecting portion in which a lower side portion from a step portion 12a formed at the lower part of both left and right side surfaces enters between the left and right seat rails 3. A cap 13 is provided on the upper surface of the fuel tank 12. A seat 14 can be opened and closed above the fuel tank 12, and the cap 14 is covered by closing the seat 14.
[0012]
A fuel pump 15 is provided in the fuel tank 12, and a fuel pipe 16 extending from the fuel pump 15 extends forward of the vehicle body and is connected to an injector 17. The fuel pipe 16 is made of an appropriate resin tube excellent in gasoline resistance, and is piped through the inside of the vehicle body cover including the front cover 18a, the rear cover 18b, and the tank cover 18c.
[0013]
The injector 17 is attached to the throttle body 20 so that the end on the injection port side faces the intake passage 21 of the intake manifold 23. The throttle body 20 extends upstream of the intake passage 21 into the clean side of the air cleaner 6 and is provided with a throttle valve 22 in the passage. The intake downstream of the intake passage 21 is connected to the intake port of the engine 7 via the intake manifold 23. Connected to.
[0014]
FIG. 2 is a configuration diagram of the fuel piping. The joint pipe 24 that protrudes upward from the upper part of the fuel pump 15 and further bends and extends in a substantially horizontal direction has a ring-shaped protrusion 25 around the substantially horizontal part. A quick connector 26 provided at one end of the fuel pipe 16 is attached to the one end of the fuel pipe 16 by using the protrusion 25.
[0015]
The quick connector 26 is formed in a substantially L shape. Since the structure is substantially the same as that of the quick connector on the injector side described later, the quick connector on the injector side will be described in detail. Reference numeral 27 in the figure is a strainer, and 28 is a liquid level sensor.
The fuel pipe 16 extends rearwardly from the top of the fuel pump 15, extends forward in a diagonally forward and downward direction below the fuel pump 15, and further forwards by changing the direction in an obliquely upward and downward direction at the intermediate portion. To the injector 17. That is, the two quick connectors 26 and 30 are integrally provided at both ends of the fuel pipe 16.
[0016]
FIG. 3 is an enlarged view of the quick connector 30 and the injector 17. The quick connector 30 includes a housing 31 having a substantially V shape, and a part of the quick connector 30 is fitted to the inside of one end of the fuel pipe 16. It is a connection part 32. The outer peripheral side of the tube side connecting portion 32 is tapered, and irregularities having a substantially sawtooth cross section are formed around the outer periphery of the tube side connecting portion 32 so that the fitting portion of the fuel pipe 16 is difficult to come off.
[0017]
The housing 31 is formed of an appropriate material such as a relatively rigid resin or metal, and gradually becomes thicker with the small diameter portion 33, the medium diameter portion 34, and the large diameter portion 35 toward the lower side of the figure. Openings 36 are formed at appropriate intervals in the circumferential direction. An O-ring 37 and an upper portion 39 of a retainer 38 are fitted on the inner peripheral side of the middle diameter portion 34.
[0018]
The retainer 38 is a member corresponding to the retaining means in the present invention. The upper portion 39 has a small diameter portion that fits inside the medium diameter portion 34, and the lower portion 40 has a large diameter that fits inside the large diameter portion 35. Part. The inner peripheral surface of the lower portion 40 forms a tapered surface 41 that gradually expands outwards downward, and a ring-shaped engagement groove 42 is formed at a connection portion between the tapered surface 41 and the straight inner peripheral surface of the upper portion 39. Is formed.
[0019]
The lower end portion of the lower portion 40 forms a protrusion 43 protruding in the axial direction of the small diameter portion 33 and is fitted inside the thick portion 44 forming the lower end portion of the large diameter portion 35. Further, the outer peripheral portion of the lower portion 40 forms a side protrusion 45 that fits into the opening 36.
[0020]
On the other hand, the injector 17 is provided with a joint portion 50 that is approximately the same diameter as the inner periphery of the thin portion 33 of the housing 31 and fits inside the housing 31, and a ring-shaped protrusion 51 projects outwardly on the outer periphery of the intermediate portion. It is integrally formed. The ring-shaped protrusion 51 is in a position to engage with the engaging groove 42 of the lower portion 40.
[0021]
Therefore, when the quick connector 30 is put on the joint portion 50 of the injector 17, first, the upper end of the joint portion 50 enters the housing 31 from the inner peripheral side of the protrusion 43, which is the lower end of the quick connector 30, and the inner periphery of the large-diameter portion 35. And the inner periphery of the O-ring 37 and the inner periphery of the small-diameter portion 33. At this time, the ring-shaped protrusion 51 is first guided by the tapered surface 41 and proceeds upward in the figure, and moves upward while pushing the lower portion 40 outward and engages with the engaging groove 42.
[0022]
As a result, the joint portion 50 is engaged with the retainer 38 and is prevented from coming off, and the retainer 38 is engaged with the housing 31 by the side projection 45 being fitted into the opening 36, so that the quick connector 30 is retained by the retainer 38. 38, the joint portion 50 of the injector 17 is prevented from coming off and coupled, so that the quick connector 30 can be connected to the joint portion 50 by one-touch connection.
[0023]
Around the lower portion of the injector 17, a ring-shaped flange 52 projects outward and is integrally formed, and is fitted directly to the lock portion 56 via a seal 53. The lock portion 56 is formed so as to surround the opening portion of the through hole 55 formed in the intake passage wall portion 54 of the throttle body 20 that forms part of the intake manifold 23. The lower end 57 of the injector 17 forms an injection port and faces the intake passage 21 from the through hole 55.
[0024]
Since the through hole 55 communicates with the curved portion of the intake manifold 23 directed obliquely upward, the injection center direction of the fuel injected from the lower end 57 of the injector 17 is directed substantially vertically to the intake port of the combustion chamber (not shown). It is attached so that it may become downward (refer FIG. 1).
[0025]
FIG. 4 is a view showing the lock portion 56, which is a mounting seat for the injector 17, from the upper side in the axial direction of the injector 17, and the lock portion 56 is formed at symmetrical positions at intervals of 180 ° as a portion protruding radially inward. A fitting groove 56a for fitting the flange 52 is formed below the fitting groove 56a. On the other hand, the flange 52 is formed with a narrow-diameter portion 58 whose outer peripheral side is inside the inner periphery of the lock portion 56 and a large-diameter portion 59 that fits into the fitting groove 56a and overlaps the lock portion 56 at 180 ° intervals. (See FIG. 3).
[0026]
As shown in FIG. 4, the small-diameter portion 58 is aligned with the lock portion 56 and the lower end 57 is inserted into the through-hole 55, and then the injector 17 is rotated approximately 90 ° clockwise (in the direction indicated by the arrow A) around the axis. When moved, the large-diameter portion 59 of the flange 52 is fitted into a fitting groove 56a formed on the lower side of the lock portion 56 and is prevented from coming off, so that the intake manifold side is not required without using a conventional holder. Fixed directly to. One end portion of the fitting groove 56a is closed to form a rotation preventing portion 56b, and the injector 17 is attached by rotating the injector 17 excessively in the clockwise direction or rotating counterclockwise (the direction opposite to the arrow A). Can be prevented.
[0027]
Next, the operation of this embodiment will be described. As shown in FIGS. 3 and 4, the injector 17 is directly attached and fixed to the lock portion 56 that forms a part of the intake manifold 23. Therefore, it is not necessary to use a separate holder or a holder integrally formed as a part of the fuel pipe 16 as in the prior art, and it is not necessary to fix the holder to the engine side with bolts or clips. Therefore, the number of parts and assembly man-hours can be reduced.
[0028]
In addition, since the quick connector 30 is integrally provided at one end of the fuel pipe 16, when the quick connector 30 is put on the injector 17, the quick connector 30 is engaged with the injector 17 in a one-touch manner and is prevented from being detached. The connection work of the pipe 16 to the injector 17 is simple and quick.
[0029]
At this time, since the ring-shaped protrusion 51 is provided around the joint portion 50, the retainer 36 can be engaged with the joint portion 50. Further, since the quick connector 30 is integrated with the fuel pipe 16, the handling is easy. In addition, since the quick connector 26 is provided also on the fuel pump 15 side, the connection with the fuel pump 15 is simple and quick.
[0030]
The present invention is not limited to the above-described embodiments, and various modifications and applications can be made within the principle of the invention. For example, the quick connectors 26 and 30 are not limited to the structure of the embodiment, and any known similar structure can be used as long as it can be connected in a one-touch manner with a retaining means such as a retainer 36.
[Brief description of the drawings]
FIG. 1 is a side view of an essential part of a motorcycle to which an embodiment is applied. FIG. 2 is a configuration diagram of a fuel pipe. FIG. 3 is a diagram showing a connection portion between an injector and a fuel pipe. Showing the mounting part for
6: Air cleaner, 7: Engine, 12: Fuel tank, 15: Fuel pump, 16: Fuel pipe, 17: Injector, 20: Strol body, 21: Intake passage, 23: Intake manifold, 30: Quick connector, 36: Retainer (prevention means), 50: joint part, 51: ring-shaped protrusion (projection part provided on the injector), 55: through-hole, 56: lock part (mounting seat)

Claims (3)

In a fuel piping structure of a fuel injection engine that supplies fuel from a fuel pump to an injector attached to an intake passage of the engine via a fuel pipe,
The injector directly fixed to the intake passage side, the quick connector (30) connected to the injector at the one-touch at least the injector connection side end of the fuel pipe is provided, the quick connector (30) is covered to the injector As well as fixing it directly ,
The quick connector (30) includes a housing (31) that is substantially V-shaped by a tube side connection portion (32) to which one end of a fuel pipe is connected and a portion in which an injector is fitted.
The fuel pipe is made of a resin tube, extends from a fuel tank along a body frame of a motorcycle or the like, and is integrally connected to the tube side connection portion (32) of the housing.
The injector has a joint portion (50) that fits in the housing (31) and protrudes along the axial direction. A ring-shaped protrusion (51) is integrally provided on the outer periphery of the intermediate portion of the joint portion (50).
A fuel piping structure for a fuel injection type engine characterized in that the quick connector (30) is placed on the joint portion (50) and directly secured to prevent it from coming off. The quick connector (30) is engaged with a portion of the housing (31) where the injector is fitted, and is interposed between the housing (31) and the injector, thereby retaining the quick connector (30). (38)
The portion of the housing (31) where the injector is fitted is formed with a narrow-diameter portion (33), a medium-diameter portion (34), and a large-diameter portion (35) toward the opening end where the retainer (38) is fitted. The O-ring (37) is fitted on the inner peripheral side of the medium diameter portion (34),
The retainer (38) includes a small-diameter portion (39) that fits into the medium-diameter portion (34) of the housing (31) and a large-diameter portion (40) that engages with the large-diameter portion 35 of the housing (31) from the inside. The fuel of a fuel injection type engine according to claim 1, wherein the narrow diameter portion (39) is fitted to the inside of the medium diameter portion 35 and closer to the opening end side than the position of the O-ring (37). Piping structure. The retainer (38) includes an annular engagement groove (42) at the boundary between the small diameter portion (39) and the large diameter portion (40), and the joint portion (50) is fitted inside the retainer (38). The fuel piping structure for a fuel injection type engine according to claim 2, wherein the ring-shaped protrusion (51) is engaged with the engagement groove (42) .

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