JP2007009829A - Vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a fuel spray good even for a longitudinal engine layout in which an engine mounted longitudinally in relation to a body, a cylinder is attached inclined to either side of left or right direction in relation to the body, a spray axis may not be oriented directly to a suction port since an intake port and an intake passage are inclined if a throttle body is attached on the inclined cylinder in an upright condition. <P>SOLUTION: A vehicle is provided with the longitudinal engine having a crank shaft arranged in a vehicle fore-and-aft direction and having the cylinder inclined to either side of left or right direction of the body. An axis C5 in a vertical direction of the throttle body 17 is inclined by θ in the same direction matching with the inclination θ of a cylinder axis C1 of the cylinder 15. Consequently, even if the intake port and the intake passage of the cylinder are inclined, spray to the intake port is made good since injection axis C2 of an injector 43 is also inclined. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

   The present invention relates to a vehicle of a type in which fuel is supplied to a vertical engine by a fuel injection mechanism, and more particularly to a vehicle having an intake structure suitable for a rough terrain vehicle. The vertical installation type means an engine arrangement type in which the crankshaft is arranged in the front-rear direction of the vehicle body.

  The body of a rough terrain vehicle is equipped with a horizontally mounted engine with the crankshaft oriented in the left-right direction. The fuel injection mechanism is connected to the intake passage of the engine, and the fuel injection mechanism includes a throttle body and an injector. Some throttle bodies are mounted upright on the vehicle body (see Patent Document 1). Note that the term “upright” refers to a state in which the center line in the vertical direction of the cylinder axis, throttle body, etc. is parallel to the vertical reference line of the target member.

JP 2004-270589 A

  In the prior art, the cylinder is upright with respect to the vehicle body, and the throttle body of the fuel injection mechanism is also mounted upright with respect to the vehicle body, so that a good injection spray is ensured so that the fuel enters the intake port smoothly. Is possible. However, when the engine is placed vertically with respect to the vehicle body, the cylinder is attached to the left or right direction with respect to the vehicle body, and when the throttle body is attached to the inclined cylinder in an upright state, Since the intake port and the intake passage are inclined, the spray axis may not be directed directly to the intake port. Further, when there are a plurality of intake ports, it is conceivable that sprays to the plurality of intake ports are not uniformized. Therefore, an object is to improve fuel spraying even for such a vertically mounted engine.

In order to solve the above problems, the invention of claim 1 according to the vehicle of the present application includes a vertically mounted engine in which a crankshaft is disposed in the front-rear direction of the vehicle body and the cylinder is inclined to either side of the vehicle body in the left-right direction. In a vehicle having a fuel injection mechanism for supplying fuel to an intake port through an intake passage of a cylinder,
The fuel injection mechanism is inclined according to the inclination of the cylinder.

  A second aspect of the present invention is characterized in that, in the first aspect, a plurality of the intake ports are provided, and one intake passage is branched and connected to each of the intake ports.

  A third aspect of the present invention is characterized in that, in the first or second aspect, the fuel injection mechanism includes a throttle body and an injector, and the throttle body is inclined in accordance with an inclination of the cylinder.

  According to the first aspect of the invention, since the cylinder is inclined to the left or right side of the vehicle body due to the vertical engine, the intake port and the intake passage are also inclined. However, since the fuel injection mechanism is also tilted in accordance with the cylinder, the fuel injection mechanism is in an upright state with respect to the intake port and the intake passage, and fuel can be reliably sprayed to the intake port.

  According to the second aspect of the present invention, a plurality of intake ports are provided, and the fuel injection mechanism that is inclined in accordance with the inclination of the cylinder is connected to one intake passage that is branched and connected to each intake port. Similarly, the upright state is maintained, and fuel can be reliably sprayed to each port.

  According to the third aspect, it is easy to assemble the throttle body because it is only necessary to adjust the throttle body to the inclination of the cylinder. In addition, even when the tilt of the cylinder changes when mounted on other models, it is only necessary to match the tilt of the throttle body with the tilt of the cylinder, so that the throttle body can be diversified.

  Hereinafter, an embodiment will be described based on the drawings. In the following description, as a general rule, directions such as front, rear, left, and right are based on the forward direction of the vehicle.

  FIG. 1 is a side view of a main part in a vehicle body skeleton portion of a four-wheel buggy vehicle according to an embodiment. This vehicle is a straddle-type vehicle, and includes front wheels 2 and rear wheels 3 equipped with large-diameter low-pressure balloon tires in front of and behind a body frame 1 to enable traveling on rough terrain.

  The vehicle body frame 1 includes an upper frame 4 and a lower frame 5 that are substantially parallel to each other in the vertical direction, a front frame 6 that connects the front ends obliquely downward to the front, and a rear frame 7 that connects the rear portions obliquely upward to the rear. Is formed in a substantially loop shape, and is further reinforced by oblique stays 8 and 9.

  An engine 10 is mounted vertically in the center of the body frame 1 in the front-rear direction. Vertical installation is a layout format in which the crank axis 11 is arranged in parallel with a vehicle body center line (described later) extending in the front-rear direction, and power is output from the front and rear of the crankcase 12, and each propeller shaft for front wheels and rear wheels is output. Power is transmitted to 13 and 14.

  As will be described later, the cylinder 15 on the crankcase has a state in which the cylinder axis is inclined to either the left or right side of the vehicle body, and a throttle body 17 is connected to the rear side surface via an intake passage 16. Purified air is supplied to the throttle body 17 from an air cleaner 19 connected via a connecting tube 18 from behind.

  Fuel is supplied from a fuel pump 20 disposed in front of the engine 10 via a fuel supply pipe 21. Above the fuel pump 20, the fuel tank 22 is supported and positioned on the upper frame 4, and fuel is sent to the fuel pump 20 from the bottom via the fuel hose 23.

  An exhaust pipe 24 is connected to the front side surface of the cylinder 15. The exhaust pipe 24 is bent rearward and passes through the side of the cylinder 15, and is connected to a muffler 25 supported on the rear end of the upper frame 4, from which exhaust is discharged to the outside. A rear carrier 26 is provided above the muffler 25, and a seat 28 is disposed in front thereof.

  The front end portion of the seat 28 is connected to the rear portion of the fuel tank 22, and the upper end portion of the snorkel 29 is disposed upward below the connection portion. The lower end of the snorkel 29 is connected to the air cleaner 19.

  In the figure, reference numeral 30 is a radiator, 31 is a steering shaft, 32 is a handle, 33 is a front carrier, 34 is a front fender, and 35 is a rear fender.

  FIG. 2 is a plan view showing a part of the vehicle body skeleton in the vehicle. As is apparent from this figure, the structural member of the vehicle body frame 1, the front wheel 2 and the rear wheel 3 are provided in a pair of left and right. Reference sign C0 in the figure is a vehicle body center line and extends in the front-rear direction of the vehicle body. As described above, the engine is arranged such that the crank axis 11 (see FIG. 1) is parallel or overlaps with the vehicle body center line C0.

  The fuel pump 20 and the throttle body 17 are positioned in the vicinity of the vehicle body center line C0, and the fuel supply pipe 21 connects the fuel pump 20 and the throttle body 17 through a heat shield plate 36 disposed above the engine. Yes. The heat shield plate 36 is stretched between the left and right upper frames 4 and 4 above the engine 10 and below the fuel tank 22.

  The opening of the snorkel 29 extends long in the left-right direction across the vehicle body center line C0, and a resonator 37a for the snorkel 29 is disposed in front of the throttle body 17 in the vicinity thereof. An upper portion of the throttle body 17 is covered with a throttle body cover 38.

  A connecting tube resonator 37b is also provided on the side of the connecting tube 18 (see FIGS. 4 and 5). The air cleaner 19 is disposed between the left and right upper frames 4 and 4. Reference numerals 39 and 39 in the figure are steps provided at the center of the vehicle body, and project left and right.

  FIG. 3 is a view showing the throttle body 17 portion from obliquely above the vehicle body. In this figure, the throttle body cover 38 is omitted, but it can be detachably attached to the through hole 41 of the gusset plate indicated by the reference numeral 40 in the figure by a clip (not shown). The gusset plate 40 is attached to a corner portion between the left upper frame 4 and the cross pipe 42.

  The throttle body 17 is disposed in front of the cross pipe 42, and an injector 43 is attached to the upper portion thereof. A joint 44 provided at the rear end of the fuel supply pipe 21 is connected to one end of the injector 43, and is fixed to the joint base 46 with bolts 45 and 45. The joint base 46 is attached to the upper portion of the throttle body 17 in advance. Reference numeral 47 denotes a socket, to which an unillustrated electric wire is connected via a coupler. The vicinity of the rear end of the fuel supply pipe 21 is fixed to the throttle body 17 with a band 48.

  As is clear from this figure, the throttle body 17 and the snorkel 29 are arranged side by side between the left and right upper frames 4, 4, and a snorkel resonator 37 a connected to the side of the snorkel 29 is provided in the vicinity of the throttle body 17. It is arranged overhanging.

  FIG. 4 is a side view of the throttle body portion, with the vehicle body frame and snorkel omitted. As shown in this figure, since the throttle body 17 is tilted to either side in the left-right direction (in this example, the left side of the vehicle body), the right bolt 45 can be seen in a side view. If the throttle body 17 is in an upright state (a state in which the center line in the vertical direction described later is perpendicular to the ground), the right bolt 45 is hidden behind the joint 44 and cannot be seen.

  The throttle body 17 is connected to an intake passage 52 of a cylinder head 51 constituting the cylinder 15 via an intake pipe 50. The intake pipe 50 is fastened and fixed to the throttle body 17 and the intake passage 52 by bands 53 and 54, respectively.

  Reference numeral 55 in the figure denotes a cylinder block, and 56 denotes a cylinder head cover. Reference numeral 57 denotes a breather tube that feeds unburned gas into the air cleaner 19 from the engine side. A connecting tube resonator 37 b smaller than the snorkel resonator 37 a is attached to the side surface of the connecting tube 18.

  FIG. 5 is a plan view of the throttle body portion, in which the vehicle body frame and snorkel are also omitted. As shown in this figure, since the throttle body 17 is tilted to the left side of the vehicle body, the right side surface 17a is visible. Reference numeral 58 in the figure denotes a filter element. In this figure, the air cleaner 19 is shown with its upper lid removed. Reference numeral 59 denotes an engagement protrusion, which is hung on the left and right upper frames 4 and 4 so that the air cleaner 19 is supported by the upper frames 4 and 4. Reference numeral 29 a denotes a lower side connection portion of the snorkel 29.

  FIG. 6 is a partial cross-sectional view of the cylinder head 51 with the throttle body 17 connected to the intake passage 52. The intake passage 52 communicates with the combustion chamber 61 via an intake port 60, and the intake port 60 is opened and closed by an intake valve 62. An exhaust passage 63, an exhaust port 64, and an exhaust valve 65 are also provided on the exhaust side. 66 is a piston and C1 is a cylinder axis. In this embodiment, two intake ports 60 and two exhaust ports 64 are provided on the left and right, respectively, but only one side of each is shown in this figure (see FIG. 7 for the intake ports).

  The throttle body 17 is provided in the intake passage 70 so as to be rotatable about a valve shaft 72 in which a throttle valve 71 extends in a direction perpendicular to the paper surface, and adjusts the amount of ventilation. A fitting portion 73 is provided on the upper wall surface of the throttle body 17, and a tip portion of the injector 43 is fitted therein.

The fitting portion 73 communicates with the intake passage 70 through a through hole 74, and the spray port 75 provided at the tip of the injector 43 faces the intake passage 70 on the downstream side of the intake side of the throttle valve 71. The spray axis C2 of the injector 43 crosses the intake passage axis C3 of the intake passage 70 obliquely, intersects the intake downstream side of the throttle valve 71, and points to the intake port 60.

  FIG. 7 is a plan sectional view schematically showing the arrangement relationship of the plurality of intake ports 60, the intake passages 70, and the injectors 43. Two intake ports 60 are provided on the left and right, and the same applies to exhaust ports not shown. Note that the number of intake ports 60 may be singular or two or more. The number of exhaust ports may be the same as or different from the intake ports 60.

  In this figure, the two intake ports 60, 60 communicate with one intake passage 82 whose interior is partitioned by a partition wall 80. A partition wall 80 is provided so that a center line C4 between ports, which is a vertical line that bisects the line connecting the center points OO of the intake ports 60 and 60, passes through the center.

  Further, the intake upstream end of the intake passage 82 is connected to the intake downstream end of the intake passage 70 of the throttle body 17, and the injector 43 aligns the spray axis C2 on the extended battle of the center line C4 between ports. It arranges in the state. In this drawing, the intake passage axis C3 and the spray axis C2 of the intake passage 70 coincide with each other.

  FIG. 8 is a front view of the throttle body 17 in an attached state with respect to the cylinder 15. A center line C5 of the throttle body 17 connecting the spray port 75 and the center point P of the throttle valve 71 is inclined to the left side of the vehicle body by a predetermined inclination angle θ with respect to a vertical line V with respect to the ground (the left side in FIG. The right side is indicated by R). This inclination angle θ coincides with the inclination angle of the cylinder axis C1 of the cylinder 15 schematically indicated by a virtual line, and also overlaps with the spray axis C2.

  Next, the operation of this embodiment will be described. Since the engine 10 is placed vertically, the cylinder axis C2 of the cylinder 15 is inclined to the left side of the vehicle body at an inclination angle θ as shown in FIG. However, the throttle body 17 is also inclined to the left side of the vehicle body by the same angle θ. Therefore, as shown in the cross section of FIG. 6 in which the intake passages 52 and 70 are cut so as to pass through the centers of the intake port 60 and the throttle valve 71, the spray axis C2 is included in this cutting plane, This plane is parallel to the spray axis C2.

  As a result, the plane including the spray axis C2 and the intake passage axis C3 passes through the center of the intake port 60 even though both of the intake passage 52 and the intake port 60 are inclined to the left side of the vehicle body. Therefore, the fuel sprayed from the injector 43 is sprayed to the intake port 60 along the spray axis C2, and the fuel can be reliably sprayed to the intake port 60. Although only one intake port 60 is visible in the figure, both the left and right intake ports 60 and 60 are similarly inclined to the left side of the vehicle body.

  Further, since it is only necessary to attach the throttle body 17 in accordance with the inclination of the cylinder 15, it is easy to assemble. In addition, when the throttle body 17 is applied to other models, even if the inclination of the cylinder 15 changes, it can be handled only by changing the inclination of the throttle body 17 according to the inclination of the cylinder 15. The throttle body 17 can be diverted.

  In addition, as shown in FIG. 7, even if a plurality of intake ports 60, 60 are arranged on the left and right, the plane including the spray axis C2 and the intake passage axis C3 is provided if the inclination of the throttle body 17 matches the inclination of the cylinder 15. Becomes parallel to the cylinder axis C1, so that the upright condition for the cylinder can be maintained.

  Therefore, in the plane orthogonal to the cylinder axis, the positional relationship shown in the drawing between each of the intake ports 60, 60, the intake passage 82, the partition wall 80, and the injector 43 is maintained, and the spray from the injector 43 along the spray axis C2 is maintained. The fuel thus divided is divided into two by the partition wall 80 and smoothly enters the intake ports 60, 60, so that the fuel can be reliably sprayed to the intake ports 60, 60.

  In addition, this invention is not limited to said Example, A various design change etc. are possible in the range which does not deviate from the summary. For example, the valve shaft 72 of the throttle body is arranged parallel to the ground with respect to the tilted cylinder as described above, and only the injector 43 is tilted so that its spray axis is parallel to the tilt of the cylinder in front view. Also good. In this way, since only the position of the injector 43 is changed, good spraying can be performed, and the layout of other components arranged on the throttle body 17 can be kept unchanged.

Further, the applicable vehicle is not limited to a buggy vehicle, and can be applied to various vehicles as long as the vehicle has an engine placed vertically.

Side view of the skeleton part of the buggy according to the embodiment Main part plan view of the skeleton part of the buggy Throttle body part perspective view Side view of the main part of the above part Main part plan view of the above part Partial sectional view of the engine with the throttle body installed Top view schematically showing the intake system Front view of throttle body in installed state

Explanation of symbols

1: body frame, 10: engine, 17: throttle body, 43: injector, 50: intake connection pipe, 51: cylinder head, 52: engine intake passage, 60: intake port, 70: intake passage of throttle body, 71 : Throttle valve, 72: valve axis, 80: partition wall, 82; engine intake passage

Claims (3)

Equipped with a vertically mounted engine with a crankshaft arranged in the longitudinal direction of the vehicle body and a cylinder tilted to either side of the vehicle body, and a fuel injection mechanism for supplying fuel to the intake port through the intake passage of the cylinder In the vehicle,
A vehicle characterized in that the fuel injection mechanism is inclined according to the inclination of the cylinder.   2. The vehicle according to claim 1, further comprising a plurality of intake ports and a single intake passage that branches and connects to each of the intake ports. The vehicle according to claim 1 or 2, wherein the fuel injection mechanism includes a throttle body and an injector, and the throttle body is inclined in accordance with an inclination of the cylinder.

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