JP2016068835A5 - - Google Patents

Description

Internal combustion engine for saddle-ride type vehicles

  The present invention relates to an engine disposed below a main frame in a vehicle body frame having a head pipe that supports the steering handle in a steerable manner and a main frame that is inclined rearwardly downward from the head pipe and extends rearward. A main body is mounted with a cylinder axis inclined forward, and an air cleaner disposed between a cylinder head constituting a part of the engine main body and the main frame is connected to an upstream end portion of a throttle body via a connecting tube, The present invention relates to a straddle-type vehicle internal combustion engine in which a downstream end portion of the throttle body is connected to the cylinder head via an intake pipe communicating with an intake port of the cylinder head.

  An engine body with the cylinder axis inclined forward is mounted on a backbone-type body frame, and an air cleaner arranged between the main frame and the cylinder head of the body frame is connected to the intake of the cylinder head via the connecting tube, throttle body, and intake pipe. An internal combustion engine for a saddle-ride type vehicle connected to a port is known from Patent Document 1.

JP 2013-217338 A

  In the internal combustion engine disclosed in Patent Document 1, the fuel injection valve is attached to the front side of the throttle body, and the fuel injection direction of the fuel injection valve is directed to the intake port, thereby suppressing fuel adhesion to the inner surface of the intake pipe. I am doing so. However, since the intake pipe is interposed between the throttle body to which the fuel injection valve is mounted and the cylinder head, the distance from the fuel injection valve to the intake port is relatively large, so the viewpoint of further suppressing the fuel intake pipe adhesion Then there is a problem. Also, if you want to lower the position of the air cleaner, the space between the air cleaner and cylinder head becomes smaller, making it difficult to achieve both the arrangement of the throttle body and intake pipe and the arrangement of the fuel injection valve between the throttle body and cylinder head. It becomes.

  The present invention has been made in view of such circumstances, and even if the fuel injection valve is arranged closer to the intake port and the arrangement position of the air cleaner is lowered, the arrangement of the throttle body and the intake pipe, and the throttle body and cylinder are arranged. It is an object of the present invention to provide a saddle-ride type internal combustion engine for a saddle-ride type vehicle that can achieve both the placement of fuel injection valves between heads.

  In order to achieve the above object, the present invention provides a vehicle body frame having a head pipe that supports a steering handle in a steerable manner, and a main frame that tilts rearwardly downward from the head pipe and extends rearward. An engine main body arranged below the frame is mounted with a cylinder axis inclined forward, and a cylinder head constituting a part of the engine main body and an air cleaner arranged between the main frames are connected to the throttle body via a connecting tube. In the internal combustion engine for a saddle-ride type vehicle, in which the downstream end of the throttle body is connected to the cylinder head via an intake pipe communicating with the intake port of the cylinder head. The fuel injection valve extends from the intake port while being curved obliquely upward and forward from the side of the vehicle. An intake valve and an exhaust valve which are attached to the front side and which open and close according to the rotation of a camshaft rotatably supported by the cylinder head are disposed on the cylinder head, and the camshaft side of the intake valve An intake valve side maintenance opening for maintaining the end of the exhaust valve, and an exhaust valve side maintenance opening for maintaining the end of the exhaust valve on the camshaft side. The first feature is that the intake valve side maintenance cover that closes the exhaust valve and the exhaust valve side maintenance cover that closes the exhaust valve side maintenance opening can be opened and closed independently of each other and attached to the cylinder head.

  According to the present invention, in addition to the configuration of the first feature, an intake pipe coupling surface that faces the outer end opening of the intake port so as to couple the downstream end portion of the intake pipe faces forward in a vehicle side view. A second feature is that the cylinder head is formed so as to face obliquely upward.

  According to the present invention, in addition to the configuration of the second feature, a cover coupling surface for coupling the intake valve side maintenance cover is formed on the cylinder head on the same plane as the intake pipe coupling surface. The third feature.

  The present invention is directed to a vehicle body frame having a head pipe that supports a steering handle so as to be steerable and a main frame that extends rearward from the head pipe, and an engine body disposed below the main frame has a cylinder axis in front. An air cleaner disposed between the cylinder head and the main frame that is mounted at an angle and is disposed between the main frame and the cylinder head is connected to the upstream end of the throttle body via a connecting tube, and the downstream end of the throttle body In a saddle-ride type vehicle internal combustion engine having a portion connected to the cylinder head via an intake pipe that communicates with the intake port of the cylinder head, the intake pipe is bent obliquely forward and upward from the intake port in a side view of the vehicle. The fuel injection valve is attached to the front side of the intake pipe, and the lower part of the air cleaner is To be arranged so as to overlap with at least a portion of the throttle body on both the front view and the fourth characteristic.

  In addition to any of the configurations of the first to fourth features, the present invention provides a purification chamber between the cleaner case in which the air cleaner is opened forward and the cleaner case while holding the cleaner element. A partition plate that closes the opening end of the cleaner case, and is fastened to the cleaner case from the front so as to sandwich the outer periphery of the partition plate with the cleaner case, and the partition plate And a cleaner cover that forms an unpurified chamber therebetween, and a projecting portion that forms a bulging chamber that communicates with the purifying chamber protrudes toward the unpurified chamber at the lower portion of the partition plate. This is a fifth feature.

The present invention, in addition to the configuration of the fifth feature, the said portion housed in the clean room of the connecting tube is curved so as to form a U-shape which is open rearwardly downward of the main frame It is a sixth feature that it is formed.

The present invention relates to an engine disposed below a main frame in a vehicle body frame having a head pipe that supports the steering handle in a steerable manner and a main frame that is inclined rearwardly downward from the head pipe and extends rearward. A main body is mounted with a cylinder axis inclined forward, and an air cleaner disposed between a cylinder head constituting a part of the engine main body and the main frame is connected to an upstream end portion of a throttle body via a connecting tube, In a saddle-ride type internal combustion engine in which a downstream end portion of the throttle body is connected to the cylinder head via an intake pipe communicating with an intake port of the cylinder head, the intake pipe extends from the intake port in a side view of the vehicle. The fuel injection valve is attached to the front side of the intake pipe, and is The head is provided with an intake valve and an exhaust valve that open and close according to the rotation of a camshaft rotatably supported by the cylinder head, and for maintaining the end of the intake valve on the camshaft side An intake valve side maintenance opening, and an exhaust valve side maintenance opening for maintaining the camshaft side end of the exhaust valve, and closing the intake valve side maintenance opening A seventh feature is that an exhaust valve side maintenance cover for closing the exhaust valve side maintenance opening is attached to the cylinder head so that it can be opened and closed independently of each other.

The present invention is directed to a vehicle body frame having a head pipe that supports a steering handle so as to be steerable and a main frame that extends rearward from the head pipe, and an engine body disposed below the main frame has a cylinder axis in front. An air cleaner disposed between the cylinder head and the main frame that is mounted at an angle and is disposed between the main frame and the cylinder head is connected to the upstream end of the throttle body via a connecting tube, and the downstream end of the throttle body In a saddle-ride type vehicle internal combustion engine, the portion of which is connected to the cylinder head via an intake pipe communicating with the intake port of the cylinder head, the intake pipe is curved obliquely upward from the intake port in a side view of the vehicle The fuel injector is attached to the front side of the intake pipe, and the lower part of the air cleaner is a vehicle To be arranged so as to overlap with at least a portion of the throttle body in terms when viewed characterized eighth.

According to a ninth aspect of the present invention, in addition to the configuration of the seventh or eighth feature, the connecting tube is formed to be curved so as to form a U-shape opened rearward below the main frame. Features.

Furthermore, the present invention provides, in addition to any of the first to ninth features, that the connecting tube is formed to be curved so that a part thereof protrudes rearward in a vehicle side view. Features.

According to the above feature of the present invention, the intake pipe extends obliquely upward from the intake port in a side view of the vehicle, so that the length of the intake pipe is extended and the vertical length is suppressed, and the fuel injection valve is attached to the front side of the intake pipe. Ru distance between the fuel injection valve and the intake port shortened to be able to suppress the intake passage adhesion fuel effectively by.

In particular, according to the first and seventh features of the present invention, the arrangement of the air cleaner is achieved by making the cylinder head a so-called integrated head having an intake valve side maintenance opening and an exhaust valve side maintenance opening. Even if the position is lowered, the arrangement of the throttle body and the intake pipe and the attachment of the fuel injection valve to the intake pipe are compatible, and maintainability of the valve operating system parts can be ensured.

In particular , according to the second feature of the present invention, the intake pipe coupling surface that faces the outer end opening of the intake port faces the front upper side in a vehicle side view, so that the intake pipe and the intake port are connected while suppressing bending. Thus, fuel adhering to the intake pipe can be suppressed and the premixed air can be smoothly guided to the combustion chamber.

In particular , according to the third feature of the present invention, there is a cover coupling surface for coupling the intake valve side maintenance cover on the same plane as the intake pipe coupling surface. They can be formed at the same time by one processing, and the number of processing steps can be reduced.

Particularly, according to the fourth and eighth aspect of the present invention, the bottom of d Akurina overlaps with at least a portion of the throttle body in the vehicle front view, the arrangement of the throttle body and the intake pipe, a fuel injection valve into the intake pipe The capacity of the air cleaner can be secured.

In particular , according to the fifth feature of the present invention, the lower portion of the partition plate holding the cleaner element so that the outer peripheral portion is sandwiched between the cleaner case and the cleaner cover fastened to the cleaner case from the front, Since the protrusion that forms the bulging chamber that leads to the purification chamber between the cleaner case and the partition plate protrudes integrally to the unpurified chamber side between the partition plate and the cleaner cover, the volume of the purification chamber Can be made as large as possible.

More particularly , according to the sixth feature of the present invention, since the portion of the connecting tube accommodated in the purification chamber is curved so as to form a U shape, the intake pipe length can be extended to increase the low-speed torque. .

1 is a left side view of a motorcycle. It is a principal part enlarged view of FIG. It is a vertical side view of the intake system of an internal combustion engine. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. An air cleaner in a state of omitting the cleaner cover is a view from 5-5 direction indicated by the arrow in FIG. It is the perspective view which looked at the intake system of the internal combustion engine from the left front diagonally downward in the state where the air cleaner was omitted. FIG. 7 is a view taken in the direction of arrow 7 in FIG. 6. It is a top view which shows the relative position of a vehicle body frame, an engine main body, and a fuel hose. FIG. 3 is a side view corresponding to FIG. 2 of the first comparative example. It is a side view corresponding to FIG. 2 of the 2nd comparative example. It is sectional drawing corresponding to FIG. 3 of a modification. It is a figure corresponding to Drawing 7 of a modification.

  Embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, front and rear, top and bottom, and left and right refer to directions viewed from the occupant who rides the motorcycle.

  First, in FIG. 1, a body frame F of a motorcycle that is a saddle-ride type vehicle includes a head pipe 13 that pivotally supports a front fork 11 and a steering handle 12 that pivotally support a front wheel WF, and a head pipe 13 that A single main frame 14 inclined rearward and extending rearward, a pair of left and right pivot plates 15 connected to a rear end portion of the main frame 14 and extending downward, and a rear end of the main frame 14 And a pair of left and right seat rails 16 extending rearward from the portion, and configured as a backbone type.

  The rear wheel WR is rotatably supported at the rear end portion of the swing arm 18, and the front end portion of the swing arm 18 is supported by the pivot plate 15 via a support shaft 19 so as to be swingable. A rear cushion unit 20 is provided between the rear portion of the rail 16 and the rear portion of the swing arm 18.

  Referring also to FIG. 2, an engine main body 21 of an internal combustion engine E that is a single cylinder has a crankcase 23, a cylinder body 24, and a cylinder head 25 that support a crankshaft 22 that has an axis lined in the width direction of the motorcycle. Combined. The engine body 21 is mounted on the vehicle body frame F so that the cylinder axis C is inclined forward until it becomes substantially horizontal and is disposed below the main frame 14.

  The crankcase 23 accommodates a transmission (not shown) that transmits the rotational power of the crankshaft 22 while changing the rotational speed, and one end of the output shaft 26 of the transmission is connected to the crankcase. It protrudes outward from the crankcase 23 behind the shaft 22. In addition, an endless chain 29 is wound around a driving sprocket 27 fixed to the protruding end of the output shaft 26 and a driven sprocket 28 provided on the rear wheel WR.

  A front portion of the vehicle body frame F and a part of the internal combustion engine E are covered with a front cover 30, and a rear portion of the vehicle body frame F is covered with a body cover 31, and a riding seat 32 is provided on the body cover 31 so that it can be opened and closed. A fuel tank (not shown) covered from above with the riding seat 32 is accommodated in the front portion of the body cover 31.

  Referring also to FIG. 3, a piston 34 connected to the crankshaft 22 is slidably fitted into a cylinder bore 33 of the cylinder body 24, and a combustion chamber 35 that faces the top of the piston 34. Is formed between the cylinder body 24 and the cylinder head 25.

  The cylinder head 25 is provided with an intake port 36 for intake into the combustion chamber 35 so as to open to the upper side wall of the cylinder head 25, and an exhaust port 37 for exhausting from the combustion chamber 35. The cylinder head 25 is provided so as to open on the lower side wall.

  The cylinder head 25 is closed with an intake valve 38 for controlling intake air from the intake port 36 to the combustion chamber 35 and an exhaust valve 39 for controlling exhaust gas from the combustion chamber 35 to the exhaust port 37. A valve operating mechanism 40 that opens and closes the intake valve 38 and the exhaust valve 39 is accommodated in the cylinder head 25 while being urged by a spring in the direction.

  The valve mechanism 40 can rotate around an axis parallel to the crankshaft 22 and is rotatably supported by the cylinder head 25, and between the intake valve 38 and the camshaft 41. An intake valve rocker arm 42 provided, and an exhaust valve rocker arm 43 provided between the exhaust valve 39 and the camshaft 41 are provided.

  Rotational power from the crankshaft 22 is transmitted to the camshaft 41 via a timing transmission mechanism (not shown). The cylinder head 25 supports an intake valve side rocker shaft 44 and an exhaust valve side rocker shaft 45 that have axes parallel to the camshaft 41, and are swingably supported by the intake valve side rocker shaft 44. The intake valve rocker arm 42 swings according to the rotation of the camshaft 41 to open and close the intake valve 38 and is supported by the exhaust valve side rocker shaft 45 so as to be swingable. 43 swings according to the rotation of the camshaft 41 to open and close the exhaust valve 39.

  Moreover, the cylinder head 25 includes an intake valve side maintenance opening 46 for maintaining the end 38a of the intake valve 38 on the camshaft 41 side, and an end 39a of the exhaust valve 39 on the camshaft 41 side. And an exhaust valve side maintenance opening 47 for closing the intake valve side maintenance opening 47, and an exhaust valve side maintenance cover for closing the exhaust valve side maintenance opening 47. 49 is attached to the cylinder head 25 with a plurality of bolts 50 and 51 so that the cylinder 49 can be opened and closed independently.

  An upstream end portion of an exhaust pipe 52 connected to the exhaust port 37 is fastened to a lower side wall of the cylinder head 25, and the exhaust pipe 52 passes rearward of the engine body 21 as shown in FIG. And is connected to an exhaust muffler (not shown) disposed on the right side of the rear wheel WR.

  On the other hand, an air cleaner 54 is disposed between the cylinder head 25 and the main frame 14, and the air cleaner 54 is connected to the upstream end of the throttle body 56 via a connecting tube 55, and the downstream end of the throttle body 56. The portion is connected to the upper side wall of the cylinder head 25 via an intake pipe 57 connected to the intake port 36 of the cylinder head 25.

  As shown in FIGS. 2 and 3, the intake pipe 57 extends from the intake port 36 while being bent obliquely forward and upward in a side view of the vehicle, and the intake pipe 57 is integrated with the downstream end thereof. A flange portion 57a is provided with a plurality of bolts 59 to an intake pipe coupling surface 58 formed on the cylinder head 25 so as to face the outer end opening of the intake port 36.

  In addition, as shown in FIGS. 2 and 3, the intake pipe coupling surface 58 is formed in the cylinder head 25 so as to face obliquely upward in the side view of the vehicle, and the intake valve side maintenance cover 48. Is formed on the cylinder head 25 on the same plane PL as the intake pipe coupling surface 58.

  The connecting tube 55, the throttle body 56, and the intake pipe 57 form an intake passage 61 that connects the intake port 36 and the air cleaner 54, and adjusts the amount of air flowing through the intake passage 61. The throttle valve 62 is provided on the throttle body 56.

  4 and 5 together, the air cleaner 54 forms a purification chamber 69 between the bowl-shaped cleaner case 65 opened forward and the cleaner case 65 while holding the cleaner element 68. A partition plate 66 that closes the opening end of the cleaner case 65 and a plurality of screw members 71 (see FIG. 5) from the front to the cleaner case 65 so as to sandwich the outer peripheral portion of the partition plate 66 with the cleaner case 65. 2) and a cleaner cover 67 that forms an unpurified chamber 69 between the partition plate 66 and the cleaner cover 67.

  At the lower part of the partition plate 66, a protruding portion 66a that forms a bulging chamber 72 that communicates with the inside of the purification chamber 69 is integrally protruded so as to protrude toward the unpurified chamber 69 side.

  The upper portion of the air cleaner 54 is fastened to the main frame 14 with a fastening member having an axis extending in the vehicle width direction. In this embodiment, the air cleaner 54 is provided on the upper portion of the cleaner case 65 in the air cleaner 54. A pair of left and right attached portions 65a, 65a are bolts 74, 74 as a pair of left and right fastening members and nuts 75, 75 screwed to the bolts 74, 74 to a stay 73 fixed to the main frame 14. And concluded.

  Suction ports 76, 76 are provided on the left and right sides of the upper portion of the partition plate 66, and a pair of left and right suction pipes 77, 77 individually connected to the suction ports 76, 76 penetrate the cleaner case 65. And it is extended backward. Accordingly, outside air is sucked into the unpurified chamber 70 of the air cleaner 54 from the rear side of the air cleaner 54 through the suction pipes 77 and 77.

The connecting tube 55 air-tightly penetrates the cleaner case 65 so that the downstream end 55a protrudes downward from the cleaner case 65 in the air cleaner 54, and the downstream end 55a of the connecting tube 55 is A band 78 is connected to the upstream end of the throttle body 56. That is, most of the connecting tube 55 is accommodated in the purification chamber 69 of the air cleaner 54, and the portion 55 b of the connecting tube 55 accommodated in the purification chamber 69 is the main frame 14. It is formed so as to be curved so that a part protrudes rearward in a side view of the vehicle while forming a U-shape that is opened rearwardly below.

  Referring to FIGS. 6 and 7 together, on the front side of the intake pipe 57 which is an intake passage forming member that forms a part of the intake passage 61 that connects the air cleaner 54 and the intake port 36 of the cylinder head 25. The fuel injection valve 63 is attached.

  Moreover, the lowermost part 54aa of the lower edge part 54a of the air cleaner 54 where the fuel injection valve 63 is arranged in the vehicle width direction is used to fasten the upper part of the air cleaner 54 to the stay 73 of the main frame 14. The fuel injection valve 63 is disposed outside the virtual rotation locus CT1 (see FIG. 3) drawn around the axis of the axis.

  Further, as shown in FIG. 5, the lower edge portion 54a of the air cleaner 54 is formed so as to be inclined so as to become a lower position toward one side in the vehicle width direction (to the left in this embodiment) when viewed from the front of the vehicle. As shown in FIG. 3, the fuel injection valve 63 is disposed below the air cleaner 54 with its upper end being flush with the lower end of the air cleaner 54 as viewed from the side of the vehicle. That is, a recess 78 is formed in the lower portion of the air cleaner 54 at the rear side of the cleaner case 65, and the throttle body 56 and a part of the intake pipe 57 are disposed so as to be accommodated in the recess 78. The injection valve 63 is arranged so that its upper end is flush with the lower end of the air cleaner 54 as viewed from the side of the vehicle.

  A part of the fuel injection valve 63 is inserted into a valve mounting hole 80 provided in the intake pipe 57, and the fuel injection valve 63 includes the intake pipe 57 and a cap 81 fastened to the intake pipe 57. Is retained.

  At the end of the fuel hose 82 that supplies fuel to the fuel injection valve 63 on the fuel injection valve 63 side, a quick connector 83 that is fitted and connected to the connection pipe 81a of the cap 81 is provided. The intake pipe 57 is integrally provided with a detent rib 57 b that engages with the quick connector 83 connected to the combustion injection valve 63.

  In addition, as shown in FIG. 8, the fuel hose 82 is disposed inside the outermost end in the vehicle width direction of the engine body 21. That is, in this embodiment, the inner side in the vehicle width direction is more inward than the virtual vertical plane VL1 that forms a part of the engine body 21 and passes through the outermost surface of the cover 84 that is coupled to the left side surface of the crankcase 23. The routing path of the fuel hose 82 is set so that there is a virtual vertical plane VL2 passing through the outer end of the fuel hose 82 in the vehicle width direction.

  Next, the operation of this embodiment will be described. An air cleaner 54 disposed between the cylinder head 25 and the main frame 14 of the vehicle body frame F is connected to the upstream end portion of the throttle body 56 via the connecting tube 55. The downstream end of the throttle body 56 is connected to the cylinder head 25 via an intake pipe 57 communicating with the intake port 36 of the cylinder head 25, and the intake pipe 57 is viewed from the side of the vehicle when viewed from the side of the vehicle. Therefore, it is possible to suppress the vertical length of the intake pipe 57 while extending the intake pipe length. By attaching the fuel injection valve 63 to the front side of the intake pipe 57, the fuel injection valve 63 and The distance between the intake ports 36 can be shortened to effectively suppress the fuel intake pipe from adhering.

  In addition, the cylinder head 25 is provided with an intake valve 38 and an exhaust valve 39 that open and close according to the rotation of a camshaft 41 that is rotatably supported by the cylinder head 25, and the cam of the intake valve 38. An intake valve side maintenance opening 46 for maintaining the end portion 38a on the shaft 41 side and an exhaust valve side maintenance opening portion 47 for maintaining the end portion 39a on the camshaft 41 side of the exhaust valve 39 are provided. An intake valve side maintenance cover 48 that closes the intake valve side maintenance opening 46 and an exhaust valve side maintenance cover 49 that closes the exhaust valve side maintenance opening 47 are attached to the cylinder head 25 so that they can be opened and closed independently of each other. Therefore, by making the cylinder head 25 a so-called integrated head, Even if the arrangement position of the air cleaner 54 is lowered due to a change in the rearward descending angle of the in-frame 14, the arrangement of the throttle body 56 and the intake pipe 57 and the attachment of the fuel injection valve 63 to the intake pipe 57 are compatible. In addition, maintainability of valve operating parts such as the camshaft 41, the intake valve side rocker arm 42, and the exhaust valve side rocker arm 43 can be ensured.

  Here, referring to FIG. 9, the first comparative example is compared with the first comparative example in which a shallow dish-shaped head cover 86A is coupled to the cylinder head 25A to form a part of the engine body 21A. Then, the coupling surface 87A of the cylinder head 25A and the head cover 86A is close to the lower portion of the air cleaner 54, and it becomes difficult to ensure a sufficient clearance 88 between the air cleaner 54 and the engine body 21A. And the attachment of the fuel injection valve 63 to the intake pipe 57 are difficult to achieve, and the maintainability of the valve operating system parts also deteriorates. On the other hand, according to the present invention, as shown in FIGS. 2 and 3, a sufficient clearance 89 can be secured between the air cleaner 54 and the engine body 21. Further, referring to FIG. 10, in comparison with the second comparative example in which a deep saddle-shaped head cover 86B is coupled to the cylinder head 25B to form a part of the engine body 21BA, this second comparative example The coupling surface 87B of the cylinder head 25B and the head cover 86B is close to the intake port 36 of the cylinder head 25B, and the degree of freedom in arrangement of the intake port 36 is reduced.

  Further, since the lower portion of the air cleaner 54 is arranged so as to overlap at least a part of the throttle body 56 when viewed from the front of the vehicle, the arrangement of the throttle body 56 and the intake pipe 57 and the attachment of the fuel injection valve 63 to the intake pipe 57 are arranged. And the capacity of the air cleaner 54 can be secured.

  The cylinder head 25 has an intake pipe coupling surface 58 that faces the outer end opening of the intake port 36 so as to connect the downstream end of the intake pipe 57 so as to face obliquely upward in the side view of the vehicle. Therefore, it is possible to connect the intake pipe 57 and the intake port 36 while suppressing the bending, and it is possible to guide the premixed air smoothly to the combustion chamber 35 while suppressing the adhesion of fuel to the intake pipe 57.

  Further, since the cover coupling surface 60 for coupling the intake valve side maintenance cover 48 is formed on the cylinder head 25 on the same plane PL as the intake pipe coupling surface 58, the intake pipe coupling surface 58 and the cover coupling are formed. The surface 60 can be formed simultaneously by one processing, and the number of processing steps can be reduced.

  The air cleaner 54 is a partition that closes the opening end of the cleaner case 65 by forming a purification chamber 69 between the bowl-shaped cleaner case 65 opened forward and the cleaner case 65 while holding the cleaner element 68. An unpurified chamber 70 is formed between the plate 66 and the partition plate 66 while the outer peripheral portion of the partition plate 66 is sandwiched between the cleaner case 65 and the cleaner case 65 from the front. And a protrusion 66a that forms a bulging chamber 72 communicating with the inside of the purification chamber 69 so as to protrude toward the unpurified chamber 70. Therefore, the volume of the purification chamber 69 can be increased as much as possible.

  Further, a portion 55b accommodated in the purification chamber 69 of the connecting tube 55 is formed to be curved in a U-shape opened rearward below the main frame 14, so that the length of the intake pipe is extended. Can increase the low-speed torque.

  A mounted portion 65a provided on the upper portion of the air cleaner 54 is fastened to a stay 73 of the main frame 14 with a bolt 74 having an axis extending in the vehicle width direction, and fuel is generated in the vehicle width direction of the lower edge portion 54a of the air cleaner 54. Since the fuel injection valve 63 is arranged at the lowermost edge 54aa of the portion where the injection valve 63 is arranged outside the virtual rotation locus CT1 drawn around the axis of the bolt 74, the air cleaner 54 is Even if the bolt 74 is pivoted backward by receiving an excessive load from the front due to an event, interference between the air cleaner 54 and the fuel injection valve 63 can be avoided.

  Further, the lower edge portion 54a of the air cleaner 54 is formed so as to incline toward the lower position as it goes in the vehicle width direction (leftward in this embodiment) when viewed from the front of the vehicle. The capacity of the lower portion of the air cleaner 54 can be increased as much as possible at a portion that does not overlap the valve 63, and the fuel injection valve 63 has its upper end portion flush with the lower end portion of the air cleaner 54 as viewed from the side of the vehicle. However, since the air cleaner 54 receives an excessive load from the front due to some event, the air cleaner 54 and the fuel injection valve 63 interfere with each other even if the bolt 74 is rotated backward with the bolt 74 as a fulcrum. It can be avoided.

  A quick connector 83 is provided at the end of the fuel hose 82 for supplying fuel to the fuel injection valve 63 on the fuel injection valve 63 side, and engages with the quick connector 83 connected to the combustion injection valve 63. Since the stop rib 57b is provided integrally with the intake pipe 57, the fuel hose 82 can be held at a predetermined position without increasing the number of parts.

  Furthermore, since the fuel hose 82 is disposed on the inner side of the outermost end in the vehicle width direction of the engine body 21, contact and interference from the outside to the fuel hose 82 can be suppressed.

  As a modification of the present invention, as shown in FIGS. 11 and 12, an air cleaner 54 ′ whose vertical length is shorter than that of the air cleaner 54 shown in the above embodiment is disposed between the cylinder head 25 and the main frame 14. You may be made to do.

  The air cleaner 54 ′ is connected to the upstream end portion of the throttle body 56 via a connecting tube 55, and the downstream end portion of the throttle body 56 is connected to the cylinder via an intake pipe 57 connected to the intake port 36 of the cylinder head 25. Connected to the upper side wall of the head 25. A part of the fuel injection valve 63 is inserted into a valve mounting hole 80 provided on the front side of the intake pipe 57, and the fuel injection valve 63 includes the intake pipe 57 and a cap 81 fastened to the intake pipe 57. Is held, the fuel injection valve 63 is attached to the front side of the intake pipe 57. Further, a quick connector 83 provided at an end portion of the fuel hose 82 on the fuel injection valve 63 side is fitted and connected to a connection pipe 81 a included in the cap 81.

  The air cleaner 54 ′ forms a purification chamber 69 ′ between the bowl-shaped cleaner case 65 ′ opening forward and the cleaner case 65 ′ while holding the cleaner element 68, thereby opening the cleaner case 65 ′. A partition plate 66 'that closes the end, and an outer peripheral portion of the partition plate 66' is fastened to the cleaner case 65 'from the front so as to be sandwiched between the cleaner case 65' and the partition plate 66 '. And a cleaner cover 67 'forming an unpurified chamber 69'.

  In addition, a pair of left and right attachment portions 65 a ′ provided on the upper portion of the cleaner case 65 ′ in the air cleaner 54 ′ are screwed to the stay 73 fixed to the main frame 14 and the pair of left and right bolts 74. It is fastened with a nut 75 to be joined.

  Moreover, the lowermost part 54aa 'of the lower edge part 54a' of the air cleaner 54 'where the fuel injection valve 63 is arranged in the vehicle width direction fastens the upper part of the air cleaner 54 to the stay 73 of the main frame 14. Not only the fuel injection valve 63 is disposed outside the virtual rotation locus CT2 drawn around the axis of the bolt 74, but also the cap 81, quick connector 83 and fuel hose 82 related to the fuel injection valve 63. The fuel system parts such as are also arranged outside the virtual rotation locus CT2.

  Further, as shown in FIG. 12, the lower edge portion 54a 'of the air cleaner 54' is inclined so as to become a lower position in the vehicle front view as it goes to one side in the vehicle width direction (to the left in this embodiment). The cap 81, the quick connector 83, and the fuel hose 82 are also formed at lower positions in the vehicle width direction (to the left in this embodiment) corresponding to the lower edge portion 54a '. Are arranged as follows.

  The air cleaner 54 'has a drain pipe 90. The drain pipe 90 avoids fuel system parts such as the cap 81, the quick connector 83, and the fuel hose 82 outward in the vehicle width direction. The lower edge portion 54a 'is suspended downward from the lowest position in the vehicle width direction.

  According to this modification, even if the air cleaner 54 ′ receives an excessive load from the front due to some event and rotates backward with the bolt 74 as a fulcrum, the air cleaner 54 ′ having the drain pipe 90 does not perform fuel injection. In addition to avoiding interference with the valve 63, interference with fuel system components such as the cap 81, the quick connector 83, and the fuel hose 82 can be avoided.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.

12 ... Steering handle 13 ... Head pipe 14 ... Main frame 21 ... Engine body 25 ... Cylinder head 36 ... Intake port 38 ... Intake valve 38a ... Intake valve End 39 on the camshaft side ... Exhaust valve 39a ... End portion 41 on the camshaft side of the exhaust valve ... Camshaft 46 ... Intake valve side maintenance opening 47 ... Exhaust valve side maintenance opening 48: Intake valve side maintenance cover 49 ... Exhaust valve side maintenance cover 54, 54 '... Air cleaner 55 ... Connecting tube 55b ... Part 56 of the connecting tube housed in the purification chamber ..Throttle body 57 ... intake pipe 58 ... intake pipe coupling surface 60 ... cover coupling surface 63 ... fuel injection valve 65 ... cleaner case 6 ... Partition plate 66a ... Projection 67 ... Cleaner cover 68 ... Cleaner element 69 ... Purification chamber 70 ... Unpurified chamber 72 ... Expansion chamber C ... Cylinder axis F ... Body frame PL ... Plane

Claims (10)

  A vehicle body frame (F) having a head pipe (13) that supports the steering handle (12) in a steerable manner and a main frame (14) that is inclined rearwardly downward from the head pipe (13) and extends rearward. An engine body (21) disposed below the main frame (14) is mounted with a cylinder axis (C) inclined forward, and a cylinder head (25) constituting a part of the engine body (21) and An air cleaner (54, 54 ') disposed between the main frames (14) is connected to the upstream end of the throttle body (56) via a connecting tube (55), and the downstream end of the throttle body (56). A saddle-ride type vehicle whose part is connected to the cylinder head (25) via an intake pipe (57) communicating with an intake port (36) of the cylinder head (25) In the internal combustion engine, the intake pipe (57) extends from the intake port (36) while being bent obliquely forward and upward in a side view of the vehicle, and the fuel injection valve (63) is disposed on the front side of the intake pipe (57). The intake valve (38) and the exhaust valve (39) that are opened and closed according to the rotation of the camshaft (41) that is mounted and rotatably supported by the cylinder head (25) are arranged on the cylinder head (25). An intake valve side maintenance opening (46) for maintaining the end (38a) of the intake valve (38) on the camshaft (41) side, and the cam of the exhaust valve (39). An exhaust valve side maintenance opening (47) for maintaining the end (39a) on the shaft (41) side is provided and closes the intake valve side maintenance opening (46). A nonce cover (48) and an exhaust valve side maintenance cover (49) for closing the exhaust valve side maintenance opening (47) are attached to the cylinder head (25) so that they can be opened and closed independently of each other. An internal combustion engine for riding type vehicles.   An intake pipe coupling surface (58) that faces the outer end opening of the intake port (36) so as to connect the downstream end of the intake pipe (57) faces forward and obliquely upward in a vehicle side view. The internal combustion engine for saddle riding type vehicles according to claim 1, wherein the internal combustion engine is formed on the cylinder head (25).   A cover coupling surface (60) for coupling the intake valve side maintenance cover (48) is formed on the cylinder head (25) on the same plane (PL) as the intake pipe coupling surface (58). The internal combustion engine for a saddle-ride type vehicle according to claim 2. The main frame (14) is mounted on the vehicle body frame (F) having a head pipe (13) that supports the steering handle (12) in a steerable manner and a main frame (14) that extends rearward from the head pipe (13). ) Is mounted with the cylinder axis (C) tilted forward, and the cylinder head (25) and the main frame (14) constituting a part of the engine body (21). An air cleaner (54, 54 ') disposed therebetween is connected to the upstream end of the throttle body (56) via a connecting tube (55), and the downstream end of the throttle body (56) is connected to the cylinder head. In a saddle-ride type vehicle internal combustion engine connected to the cylinder head (25) via an intake pipe (57) communicating with an intake port (36) of (25) The intake pipe (57) extends from the intake port (36) while being curved obliquely upward and forward in a vehicle side view, and a fuel injection valve (63) is attached to the front side of the intake pipe (57). An internal combustion engine for a saddle-ride type vehicle, wherein the lower part of the air cleaner (54, 54 ') is disposed so as to overlap at least a part of the throttle body (5 6 ) when the vehicle is viewed from the front.   The air cleaner (54) forms a purification chamber (69) between the bowl-shaped cleaner case (65) opened forward and the cleaner case (65) while holding the cleaner element (68). A partition plate (66) that closes the opening end of the cleaner case (65), and an outer peripheral portion of the partition plate (66) is sandwiched between the cleaner case (65) and the cleaner case (65). And a cleaner cover (67) that forms an unpurified chamber (70) between the partition plate (66) and the interior of the purifier chamber (69) at the lower portion of the partition plate (66). The protruding portion (66a) that forms the bulging chamber (72) that communicates with the inner wall of the unpurified chamber (70) is protruded integrally with the protruding portion (66a). The saddle riding type described in item 1. Dual-purpose internal combustion engine. A portion (55b) of the connecting tube (55) accommodated in the purification chamber (69) is formed to be curved so as to form a U-shape opened rearward below the main frame (14). The internal combustion engine for a saddle-ride type vehicle according to claim 5 . A vehicle body frame (F) having a head pipe (13) that supports the steering handle (12) in a steerable manner and a main frame (14) that is inclined rearwardly downward from the head pipe (13) and extends rearward. An engine body (21) disposed below the main frame (14) is mounted with a cylinder axis (C) inclined forward, and a cylinder head (25) constituting a part of the engine body (21) and An air cleaner (54, 54 ') disposed between the main frames (14) is connected to the upstream end of the throttle body (56) via a connecting tube (55), and the downstream end of the throttle body (56). A saddle-ride type vehicle whose part is connected to the cylinder head (25) via an intake pipe (57) communicating with an intake port (36) of the cylinder head (25) In the internal combustion engine, the intake pipe (57) extends from the intake port (36) while being bent obliquely upward in a side view of the vehicle, and the fuel injection valve (63) is attached to the front side of the intake pipe (57). The cylinder head (25) is provided with an intake valve (38) and an exhaust valve (39) that open and close according to the rotation of a camshaft (41) rotatably supported by the cylinder head (25). And an intake valve side maintenance opening (46) for maintaining the end (38a) of the intake valve (38) on the camshaft (41) side, and the camshaft of the exhaust valve (39). An exhaust valve side maintenance opening (47) for maintaining the end portion (39a) on the (41) side, and an intake valve side maintainer for closing the intake valve side maintenance opening (46). A saddle riding characterized in that a cover (48) and an exhaust valve side maintenance cover (49) for closing the exhaust valve side maintenance opening (47) are attached to the cylinder head (25) so that they can be opened and closed independently of each other. Type internal combustion engine. The main frame (14) is mounted on the vehicle body frame (F) having a head pipe (13) that supports the steering handle (12) in a steerable manner and a main frame (14) that extends rearward from the head pipe (13). ) Is mounted with the cylinder axis (C) tilted forward, and the cylinder head (25) and the main frame (14) constituting a part of the engine body (21). An air cleaner (54, 54 ') disposed therebetween is connected to the upstream end of the throttle body (56) via a connecting tube (55), and the downstream end of the throttle body (56) is connected to the cylinder head. In a saddle-ride type vehicle internal combustion engine connected to the cylinder head (25) via an intake pipe (57) communicating with an intake port (36) of (25) The intake pipe (57) extends obliquely upward from the intake port (36) in a side view of the vehicle, and a fuel injection valve (63) is attached to the front side of the intake pipe (57). An internal combustion engine for a saddle-ride type vehicle, wherein the lower part of (54, 54 ') is arranged so as to overlap at least part of the throttle body (55) when the vehicle is viewed from the front. The saddle riding type according to claim 7 or 8, wherein the connecting tube (55) is formed to be curved so as to form a U-shape opened rearward below the main frame (14). Internal combustion engine for vehicles. The saddle riding type vehicle according to any one of claims 1 to 9, wherein the connecting tube (55) is formed to be curved so that a part thereof protrudes rearward in a side view of the vehicle. Internal combustion engine.

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