JP5020680B2 - Intake device for vehicle engine - Google Patents

Description

  The present invention relates to an engine main body and an air cleaner mounted on a body frame, a fuel injection device for supplying fuel to the engine main body, and an air intake device for a vehicle engine in which the air cleaner is connected via a connecting tube.

Japanese Patent Application Laid-Open No. 2004-133867 discloses an engine air intake device for a motorcycle in which a carburetor is disposed immediately below an air cleaner and the air cleaner and the carburetor are connected by a short connecting tube.
Japanese Patent No. 3537817

  By the way, although there is a case where it is desired to make the intake pipe length as long as possible in order to increase the low-speed torque depending on the vehicle, it is difficult to secure a space for arranging the connecting tube in the structure disclosed in Patent Document 1, and the necessary intake pipe length is required. Is difficult to secure.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a vehicle engine intake device that can be configured to be compact while increasing the intake pipe length in order to increase low-speed torque. .

In order to achieve the above object, according to a first aspect of the present invention, an engine main body and an air cleaner are mounted on a vehicle body frame, and a fuel injection device for supplying fuel to the engine main body and the air cleaner are connected via a connecting tube. In the vehicle engine intake device to be connected, the connecting tube includes an upstream connecting pipe having an upstream end connected to the air cleaner, and an intermediate tube having an upstream end connected to a downstream end of the upstream connecting pipe, downstream end is divided composed of a downstream side connection pipe that will be connected to the upstream end to the downstream end of the intermediate tube is connected and the fuel injection device, the upstream connecting tube to downstream end upstream end of it as oriented obliquely right and in a position which is offset rearwardly and right rearward, and tortuous, said intermediate tube , With an upstream side half portion of the intermediate tube is extended to the rear side while curved in a convex shape on the right side, of the intermediate tube, the downstream side half portion continuous to the upstream side half portion, the upstream half portion extending obliquely left side toward the front side is inverted from the downstream connecting tube is configured to extend downward from the downstream end of the intermediate tube, an intermediate portion following the extension portion, said extension and wherein the extending horizontally bent to the right side with respect to out section.

  The invention described in claim 2 is characterized in that, in addition to the configuration of the invention described in claim 1, the intermediate tube is formed by blow molding of a synthetic resin.

  According to a third aspect of the invention, in addition to the configuration of the first or second aspect of the invention, the fuel injection device and the engine main body are disposed below the air cleaner, and are formed by an upstream half of the intermediate tube. The first downcomer pipe part for guiding the air from the upstream connecting pipe downward, and the downstream half part of the intermediate tube so as to guide the air upward from the lower end of the first downcomer pipe part. The rising pipe part formed by a part, the remaining part of the downstream half of the intermediate tube and the downstream connecting pipe formed so as to be reversed from the upper end of the rising pipe part and guide the air downward. A second downcomer section connected to the fuel injection device is provided in the connecting tube, and a breather tube extending from the engine body side is connected to the connecting section of the first downcomer section and the uprising pipe section To be done And features.

  Furthermore, the invention according to claim 4 is the construction of the invention according to any one of claims 1 to 3, wherein a cleaner case of the air cleaner is supported by the body frame and the upstream connection pipe is connected. An upper case and a lower case that is detachably attached to the upper case, and a cleaner element that divides the cleaner case into an unpurified chamber and a purifying chamber that communicates with the upstream connecting pipe is formed from the upper case. It is possible to perform maintenance work with the lower case removed, and to be housed in the cleaner case.

  Further, according to the present invention, an engine main body and an air cleaner are mounted on a vehicle body frame, a fuel injection device for supplying fuel to the engine main body and the air cleaner are connected via a connecting tube, and the connecting tube is An air intake device for a vehicle engine formed by bending so as to reciprocate in the vehicle width direction, wherein the fuel injection device and the engine body are disposed below the air cleaner and connected to the air cleaner. A first downcomer that guides air from the air cleaner downward; a riser that reverses from the lower end of the first downcomer and directs air upward; And a second downcomer pipe connected to the fuel injection device so as to guide the fuel Wherein the breather tube extending from the engine body is connected to the connecting portion of the first downcomer portion and the riser portion.

In the present invention, “front-rear direction” and “left-right direction” refer to the vehicle body front-rear direction and left-right direction when the engine is mounted on the vehicle , respectively , and the throttle body 45 of the embodiment corresponds to the fuel injection device of the present invention. To do.

  According to each of the first to fourth aspects of the present invention, the connecting tube is formed to be bent so as to reciprocate in the width direction of the vehicle, thereby ensuring the intake pipe length and increasing the low-speed torque while making the intake device compact. Can be configured.

  According to the second aspect of the present invention, since a part of the connecting tube (that is, the intermediate tube) is formed by blow molding, it is easy to form a bent connecting tube, and the connecting tube can be lengthened.

  According to the inventions of claims 3 and 5, the connecting tube can be configured to be longer and more compact by bending the connecting tube so as to reciprocate up and down, and the breather is provided at the lowermost part of the connecting tube. Since the tube is connected, the oil accompanying the blow-by gas flowing through the breather tube can be returned again from the breather tube to the engine body side.

  Furthermore, according to the invention described in claim 4, it is possible to remove the lower case from the upper case and perform the maintenance work of the cleaner element without releasing the connection state of the connecting tube to the air cleaner, thereby improving the maintainability. be able to.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.

  1 to 16 show an embodiment of the present invention. FIG. 1 is a left side view of a motorcycle, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. 3 is an enlarged view of a front part of the motorcycle. 4 is a left side view showing a partial configuration of the intake system, FIG. 5 is a view taken in the direction of the arrow 5 in FIG. 4, FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. FIG. 8 is a sectional view taken along line 8-8 in FIG. 7, FIG. 9 is a partially cutaway left side view in the vicinity of the fuel tank, and FIG. 10 is a state in which the passenger seat and pump cover are omitted. 9 is a cross-sectional view taken along line 10-10 in FIG. 9, FIG. 11 is a longitudinal cross-sectional view showing the fuel hose connection structure, FIG. 12 is a partially cutaway left side view showing the front part of the vehicle body frame, and FIG. FIG. 14 is a left side view of the stay, FIG. 15 is a view from the arrow 15 in FIG. 14, and FIG. 16 is an arrow view.

  In the following description, “front”, “rear”, “left” and “right” refer to directions with respect to the traveling direction of the motorcycle.

  First, in FIG. 1, a body frame F of a motorcycle that is a small vehicle includes a head pipe 22 that supports a front fork 21 that pivotally supports a front wheel WF at a lower end portion thereof, and extends downwardly from the head pipe 22. It consists of a pipe-shaped main frame 23 and a rear frame 24 that can be divided into left and right parts and that is connected to the lower part of the main frame 23. A bar-shaped steering handle 25 is connected to an upper portion of the front fork 21, and a front fender 26 that covers the front wheel WF from above is provided on the front fork 21. The rear frame 24 is also formed so as to function as a rear fender that covers the rear wheel WR from above, and is arranged on the left side surface of the rear frame 24 corresponding to the battery 27 housed and arranged in the rear frame 24. A maintenance lid 28 is attached to be openable and closable.

  The engine body 30 of the engine E that exerts power for driving the rear wheels WR is supported by the main frame 23 so as to be disposed below the main frame 23, and a crankcase 31 of the engine body 30 is provided. A transmission (not shown) for shifting the power of the engine E is housed inside. Thus, the output shaft 33 of the transmission protrudes from the crankcase 31, and the rear end of the output shaft 33 has a front end portion of a swing arm 34 extending to the side of the rear wheel WR. Is supported in a swingable manner, the axle 35 of the rear wheel WR is rotatably supported at the rear part of the swing arm 34, and a rear cushion unit 36 is provided between the rear frame 24 and the rear part of the swing arm 34. It is done.

  A chain transmission means 38 using an endless chain 37 is provided between the output shaft 33 and the axle 35, and the power output from the output shaft 33 is transmitted to the rear wheel WR via the chain transmission means 38. Will be.

  A fuel tank 40 is provided on the front portion of the rear frame 24 so as to be an external component, and an occupant seat 41 is disposed so as to cover the fuel tank 40 from above.

  2 and 3 together, the engine E is an air-cooled type, and the engine body 30 is supported by the main frame 23 of the vehicle body frame F in a posture in which the cylinder axis is substantially horizontal. Thus, an intake system 42 is connected to the upper side surface of the cylinder head 32 constituting a part of the engine main body 30, and the intake system 42 is connected to an air cleaner 43 disposed obliquely above and in front of the engine main body 30. A connecting tube 44 for guiding the air purified by the air cleaner 43 and a fuel injection valve 46 and a throttle body disposed below the air cleaner 43 so as to be connected to the downstream end of the connecting tube 44 45 and an intake pipe 47 provided between the throttle body 45 and the cylinder head 32.

  4 to 6, the cleaner case 48 of the air cleaner 43 includes an upper case 49 made of synthetic resin and a lower case 50 made of synthetic resin that is detachably attached to the upper case 49. The upper and lower cases 49, 50 are fastened by a plurality of screw members 51... So that the lower end of the bowl-shaped upper case 49 opened downward and the upper end of the bowl-shaped lower case 50 opened upward are joined to each other. The

  A pair of brackets 49a, 49a sandwiching the main frame 23 of the body frame F from both sides are integrally provided on the upper case 49, and these brackets 49a ... are attached to the main frame 23 by bolts 52 ... It is concluded. That is, the upper case 49 is supported and fixed to the vehicle body frame F.

  In the cleaner case 48, a cleaner element 54, which is mounted on the element support frame 53 and configured in a cylindrical shape, is accommodated so that maintenance work can be performed with the lower case 50 removed from the upper case 49. Is done. Thus, in this embodiment, the rubbers 59 attached to the two lower portions of the element support frame 53 are elastically fitted into the fitting holes 58 provided in the lower case 50, thereby lowering the lower case 50. When the lower case 50 to which the element support frame 53 with the cleaner element 54 attached is attached is attached to the upper case 49, the entire upper surface of the element support frame 53 is It will be in close contact with the upper inner surface.

  The cleaner case 48 in a state where the cleaner element 54 is accommodated is divided into an unpurified chamber 55 around the cleaner element 54 and a purifier chamber 56 in the cleaner element 54. As shown by the arrows in FIGS. 3 and 4, air from the outside is introduced into the unpurified chamber 55 from the air inlets 57 that are provided on both the left and right sides and open rearward.

  The connecting tube 44 includes a rubber upstream connecting pipe 60 and a rubber downstream connecting pipe 61 connected to the throttle body 45, which are fastened to both ends of a tube 62 formed by a synthetic resin blow molding. Belts 63 and 64 are connected to each other, and the intermediate portion of the upstream connection pipe 60 has the upstream end of the upstream connection pipe 60 inserted into the purification chamber 56 of the air cleaner 43. The upper case 49 is attached. Thus, the tube 62 constitutes the intermediate tube of the present invention.

Thus, the upstream connection pipe 60 penetrates the upper case 49 so as to guide the air in the purification chamber 56 upward, and the upstream connection pipe 60 has its downstream end at the upstream end. as oriented obliquely right downward toward and rearwardly in a position which is offset rearwardly and the right hand, it is curved. The upstream half of the tube 62 is connected to the upstream connecting pipe 60 and extends rearward along the main frame 23 while curving convexly on the right side. , the downstream side half portion continuous to the upstream side half portion, said being upstream inverted from half extending toward the front upper left, the lower the downstream downstream end of the halves and further inverted It is bent upward and convex so as to face. Further, the downstream connection pipe 61 extends downward from the downstream end of the tube 62, and an intermediate part following the extension part is bent rightward with respect to the extension part and extends in the left-right direction. Further, it is formed to bend toward the rear to be connected to the throttle body 45.

  That is, the connecting tube 44 formed by connecting the upstream and downstream connecting pipes 60, 61 to both ends of the tube 62 is a first pipe constituted by the upstream connecting pipe 60 so as to guide air upward from the air cleaner 43. An ascending pipe part 44a, a first descending pipe part 44b formed at the upstream half of the tube 62 so as to reverse and guide the air from the first ascending pipe part 44a, and a first descending pipe part 44b The second rising pipe portion 44c formed by a part of the downstream half of the tube 62 and the air from the second rising pipe portion 44c are reversed so as to reverse the air from The downstream connection pipe 61 and the second downcomer pipe portion 44d formed by the remaining half of the downstream half of the tube 62 so as to be led to the throttle body 45 side of the connecting pipe are connected in order. Bed 44 will be formed by bending so as to reciprocate vertically reciprocates in the width direction of the motorcycle.

  In addition, a connecting pipe portion 65 extending rearward and downward is integrally provided at a lower portion of the connecting portion of the first descending pipe portion 44b and the second ascending pipe portion 44c in the connecting tube 44, and the crankcase of the engine main body 30 is provided. A breather tube 66 that guides blow-by gas from 31 is connected to the connecting pipe 65.

  1, 2, and 7, an exhaust system 67 is connected to the lower side surface of the cylinder head 32 in the engine body 30, and the exhaust system 67 is upstream of the lower side surface of the cylinder head 32. A first exhaust pipe 68 connected to the end and reversed to the rear side; a catalytic converter 69 connected to the downstream end of the first exhaust pipe 68; and an upstream end connected to the catalytic converter 69 to the right side of the rear wheel WR A second exhaust pipe 70 extending to the end, and an exhaust muffler 71 connected to the downstream end of the second exhaust pipe 70.

  In FIG. 8, the catalytic converter 69 includes an inner case 72, an outer case 73 that covers the inner case 72, and a catalyst 74 that is formed in a cylindrical shape and is accommodated in the inner case 72.

  The inner case 72 is provided with a partition wall 77 that divides a space portion facing the one end side of the catalyst 74 into an inlet chamber 75 and an outlet chamber 76, and an intermediate chamber 78 facing the other end side of the catalyst 74 is provided on the inner side. Formed in case 72. Thus, the first exhaust pipe 68 is hermetically penetrated through the outer case 73 and connected to the inner case 72 so that its downstream end communicates with the inlet chamber 75, and the second exhaust pipe 70 has its upstream end connected to the outlet chamber. The outer case 73 is hermetically penetrated and connected to the inner case 72 so as to communicate with the inner case 72. That is, the exhaust gas led out from the cylinder head 32 is introduced into the inlet chamber 75 on one end side of the catalytic converter 69 and flows through the catalyst 74 to the intermediate chamber 78 side on the other end side of the catalytic converter 69, and further from the intermediate chamber 78. After flowing through the catalyst 74 to the outlet chamber 76 side of one end side of the catalytic converter 69, the catalyst 74 is led out to the second exhaust pipe 70 side.

  Referring to FIGS. 9 and 10 together, mounting plate portions 40a and 40b are projected from the lower portion of the fuel tank 40 with a space in the front-rear direction, and the mounting plate portions 40a and 40b are bolts 79. , 80 are fastened to the rear frame 24, whereby the fuel tank 40 is fixed on the rear frame 24.

  The fuel in the fuel tank 40 is supplied to the fuel injection valve 46 by a fuel pump 84. The fuel pump 84 includes a suction pipe 85 extending vertically in the fuel tank 40 and a lower end of the suction pipe 85. And a discharge pipe 87 disposed above the fuel tank 40, and a flange provided above the fuel pump 84 with a gasket 83 sandwiched between the upper surface of the fuel tank 40. 84a and a pressing plate 88 that sandwiches the gasket 83 and the flange 84a between the fuel tank 40 and a plurality of bolts 89 that are implanted on the fuel tank 84 side, and the pressing plate 88, are engaged. In this manner, the nuts 90 are screwed together with the bolts 89 to be fastened to the fuel tank 40, whereby the fuel pump 84 is connected to the fuel tank. It is fixed to the click 40. The fuel pump 84 is provided with a float 91 for detecting the fuel level in the fuel tank 40.

  A front portion of the occupant seat 41 is connected to a front upper portion of the fuel tank 40 via a hinge 92. The occupant seat 41 covers the fuel tank 40 from above, and the fuel tank. The upper portion of the occupant seat 40 can be pivoted forward and forward so that the upper portion of the occupant 40 is exposed upward. The rear bottom surface of the occupant seat 41 is positioned so as to cover the fuel tank 40 from above. At one time, a pair of elastic members 93 that contact the upper surface of the fuel tank 40 are attached.

  The fuel supplied from the discharge pipe 87 of the fuel tank 40 is supplied to the fuel injection valve 46 through the pipe means 94, and the pipe means 94 penetrates the fuel tank 40 up and down. Arranged.

  In FIG. 11, the pipe line means 94 is composed of a first fuel hose 95 on the fuel tank 40 side and a second fuel hose 96 on the fuel injection valve 46 side. On the other hand, the fuel tank 40 is welded so that the upper and lower portions of the cylindrical member 98 forming the first through hole 97 penetrating the fuel tank 40 vertically are kept liquid-tight over the entire circumference. A first fuel hose 95 that constitutes at least a part of the pipe line means 94 (a part in this embodiment) and is connected to the discharge pipe 87 of the fuel tank 40 extends through the first through hole 97. The first fuel hose 95 is routed under the fuel tank 40 so as to extend forward through the rear frame 24. Moreover, as clearly shown in FIG. 2, a grommet 100 having a second through hole 99 is attached to the front portion of the rear frame 24, and the first fuel is passed through the second through hole 99. A hose 95 is extended forward.

  The male joint 104 of the first quick connector 101 is connected to the first and second through holes 97 at at least one of both ends of the first fuel hose 95, in this embodiment, at the end on the second fuel hose 96 side. 99, the male joint 104 having an outer diameter smaller than the inner diameters of the first and second through holes 97, 99. A female joint 107 of the second quick connector 102 is provided at the end of the first fuel hose 95 on the fuel tank 40 side.

  Thus, the discharge pipe 87 of the fuel tank 40 is provided with a male joint 106 of the second quick connector 102, and the female joint 107 of the first fuel hose 95 is fitted to the male joint 106. By connecting, one end of the first fuel hose 95 is connected to the discharge pipe 87. A female joint 105 of the first quick connector 101 is connected to one end of the second fuel hose 96 that constitutes the pipe line means 94 together with the first fuel hose 95, and a male joint 104 is connected to the other end of the first fuel hose 95. Are fitted and connected. Further, the other end of the second fuel hose 96 is connected to the fuel injection valve 46 via the third quick connector 103, and the other end of the second fuel hose 96 is connected to the third quick connector 103. A female joint 109 is provided, and a male joint 108 of the third quick connector 103 is provided on the fuel injection valve 46 side.

  Thus, an ordinary fuel hose generally has female joints at both ends, and an ordinary fuel hose is used as the second fuel hose 96.

  9 and 10 again, the fuel pump 84 attached to the upper surface of the fuel tank 40, the connection between the discharge pipe 87 and the first fuel hose 95 of the fuel pump 84, and the first fuel hose 95 The insertion portion to the upper end of the cylindrical member 98 is covered from above with a pump cover 110, and the pump cover 110 has a plurality of press plates 88 for attaching the fuel pump 84 to the fuel tank 40. It is attached to the upper surface of the fuel tank 40 by fastening with bolts 111.

  Further, an intermediate portion near one end of the second fuel hose 96 in the pipe line means 94 is held by a clip 112, and this clip 112 is attached to a stay 113 attached to the engine body 30.

  Referring to FIGS. 12 and 13 together, the connecting portion of the head pipe 22 and the main frame 23 has a mounting surface 115a inclined so as to face obliquely rearward, and the connecting portion is viewed from above. A covering gusset 115 is provided, and a support stay 116 extending rearward is fixed to the gusset 115, and an electronic control unit 117, a regulator 118 and a bank angle sensor 119, which are electrical components, are attached to the support stay 116. .

  14 to 16 together, the support stay 116 is formed by welding two bent metal plate members, and is flat and attached to the attachment surface 115a of the gusset 115. An attachment plate portion 116a, a first support plate portion 116b extending rearward and extending perpendicularly to the right end of the attachment plate portion 116a, and a lower left side surface of an intermediate portion in the front-rear direction of the first support plate portion 116b. A second support plate portion 116c that has a base end that extends continuously and extends upward and is inclined away from the first support plate portion 116b as it goes upward, and a first support plate portion that is formed in a substantially L shape. A leg portion 116d extending rearward from the lower portion of the middle portion in the front-rear direction of 116b, a third support plate portion 116e extending at right and left continuously to the rear end of the leg portion 116d, and a first support plate portion 11 a support claw portion 116f provided at right angles so as to protrude from the left and right sides at the upper part of the middle portion in the front-rear direction of b, and a fourth support plate portion 116g provided at right angles to the rear portion of the first support plate portion 116b With.

  A pair of upper and lower weld nuts 120, 120 are fixed to the back side of the mounting surface 115a of the gusset 115, and the mounting plate portion 116a is screwed to the weld nuts 120 with bolts 121, 121, and the gusset 115. It is fixed to.

  A pair of weld nuts 122, 122 are fixed to the left side surface of the first support plate portion 116b with a space in the front-rear direction, and the regulator 118 disposed on the right side of the first support plate portion 116b includes both the weld plates. It attaches to the 1st support plate part 116b with the volt | bolts 123 and 123 screwed together by nut 122 ....

  The electronic control unit 117 is held by a holding frame 124 made of an elastic material such as rubber and is arranged on the right side of the first support plate portion 116b. The electronic control unit 117 is inserted into the support hole 125 provided in the holding frame 124 with a first hole. The electronic control unit 117 is attached to the second support plate portion 116c by inserting the second support plate portion 116c.

  Weld nuts 126 and 126 are fixed to two front surfaces spaced apart in the left-right direction of the third support plate portion 116e, and the bank angle sensor 119 disposed on the rear side of the third support plate portion 116e is: It is attached to the third support plate portion 116e by bolts 140, 140 screwed to the weld nuts 126 with mount rubbers 127, 127 interposed between the third support plate portion 116e.

  Further, the support stay 116, an electronic control unit 117 attached to the support stay 116, a regulator 118, and a bank angle sensor 119 are covered with an electrical component cover 128 formed of an elastic material with a substantially U-shaped longitudinal section opened downward. The electrical component cover 128 is supported by the support stay 116 by inserting the support claw portion 116f of the support stay 116 into the upper portion of the electrical component cover 128.

  By the way, the left and right feet of the occupant sitting on the occupant seat 41 are covered with leg shields 129, and lower portions of the leg shields 129 are fastened to stays 131 fixed to both sides of the engine body 30. The leg shield 129 is integrally provided with a center cover 130 that covers the main frame 23 from above and covers the front portion of the engine body 30 and the intake system 42 from both the left and right sides. The upper part is fastened to both sides of the front part of the main frame 23 near the head pipe 22.

  Thus, the center cover 130 has a cover portion 130 a that covers the support stay 116, the electronic control unit 117 attached to the support stay 116, the regulator 118, the bank angle sensor 119, and the electrical component cover 128. And an opening 132 is provided at the rear of the cover portion 130a.

  A cap 133 that closes the opening 132 is detachably attached to the fourth support plate portion 116 g of the support stay 116. That is, a mounting bolt 134 that protrudes rearward from the opening 132 is fixed to the fourth support plate portion 116 g, and a cap nut 135 is screwed into a protruding end portion of the mounting bolt 134 that penetrates the cap 133. Thus, the cap 133 is attached to the support stay 116 so as to close the opening 132, and the cap 133 can be removed by loosening and removing the cap nut 135.

  Next, the operation of this embodiment will be described. Since the connecting tube 44 connecting the air cleaner 43 and the throttle body 45 in the intake system 42 is bent so as to reciprocate in the width direction of the motorcycle, the intake pipe length As a result, the intake device can be made compact while increasing the low-speed torque.

  In addition, since the tube 62 constituting a part of the connecting tube 44 is formed by blow molding of synthetic resin, the bent connecting tube 44 can be easily formed and the connecting tube 44 can be lengthened.

  The throttle body 45 and the engine body 30 are disposed below the air cleaner 43, connected to the air cleaner 43, and guides the air from the air cleaner 43 downward, and the first descending pipe portion 44b. A first ascending pipe portion 44c that reverses from the lower end and guides air upward, and a second downcomer pipe that is connected to the throttle body 45 so as to reverse air from the upper end of the first ascending pipe portion 44c and guide air downward. 44 d is provided in the connecting tube 44, and a breather tube 66 extending from the crankcase 31 of the engine body 30 is connected to the connecting portion of the first descending pipe portion 44 b and the second ascending pipe portion 44 c. Therefore, the connecting tube 44 can be made longer by bending the connecting tube 44 so as to reciprocate up and down. In addition to being able to be more compact, the breather tube 66 is connected to the lowermost part of the connecting tube 44 so that the oil accompanying the blow-by gas that circulates in the breather tube 66 is returned from the breather tube 66 to the engine body. It can be returned to the 30 side.

  The cleaner case 48 of the air cleaner 43 includes an upper case 49 supported by the vehicle body frame F and connected to the upstream end of the connecting tube 44, and a lower case 50 detachably attached to the upper case 49. The cleaner element 54 that divides the cleaner case 48 into an unpurified chamber 55 and a purifying chamber 56 that communicates with the connecting tube 44 enables maintenance work with the lower case 50 removed from the upper case 49. Therefore, the maintenance operation of the cleaner element 54 can be performed by removing the lower case 50 from the upper case 49 without releasing the connection state of the connecting tube 44 to the air cleaner 43, thereby improving the maintainability. This Can.

  A fuel pump 84 in which a discharge pipe 87 for discharging fuel is disposed above the fuel tank 40 is attached to the fuel tank 40, and a pipe line means 94 connecting the discharge pipe 87 and the fuel injection valve 46 is provided in the fuel tank 40. Since the pipe means 94 is not exposed to the outside at a portion corresponding to the fuel tank 40, the number of parts is not limited even if the fuel tank 40 is a motorcycle that constitutes an external part. It is possible to prevent the conduit means 94 from being exposed to the outside as much as possible while avoiding an increase in the appearance merchantability and avoiding unnecessary contact with the conduit means 94, and the external environment. Can be made less susceptible to

  In addition, a cylindrical member 98 penetrating the fuel tank 40 in the vertical direction is provided in the fuel tank 40, and constitutes at least a part (part in this embodiment) of the conduit means 94 and is connected to the discharge pipe 87. Since the fuel hose 95 is routed through the tubular member 98, the first fuel hose 95 penetrates the fuel tank 40 by welding the entire circumference of the upper and lower portions of the tubular member 98 to the fuel tank 40. The sealing performance can be easily ensured.

  The fuel tank 40 is provided on the rear frame 24 constituting a part of the vehicle body frame F, and the first fuel hose 95 penetrating the tubular member 98 is routed so as to pass through the rear frame 24. Therefore, it is not necessary to provide a dedicated cover for covering the first fuel hose 95, and the longer part of the first fuel hose 95 can be prevented from being exposed to the outside.

  The male joint 104 of the first quick connector 101 is provided at at least one of both ends of the first fuel hose 95, in this embodiment, at the end on the second fuel hose 96 side in this embodiment. Since the joint 104 has a smaller diameter than the female joint, the first fuel hose 95 can be easily routed even if a narrow gap or a small-diameter through hole exists in the middle of the routing path of the first fuel hose 95. It is possible to increase the degree of freedom in arranging the fuel hose.

  Moreover, the male joint 104 provided in the first fuel hose 95 is a through-hole disposed in the middle of the routing path of the first fuel hose 95, that is, the first through-hole 97 formed by the cylindrical member 84 and the rear. Since it is possible to penetrate the second through-hole 99 formed by the grommet 100 attached to the front portion of the frame 24, the workability of the first fuel hose 95 can be improved, and the first Since the outer diameter of the male joint 104 is smaller than the inner diameter of the second through holes 97 and 99, the first fuel hose 95 can be easily passed through the tubular member 98 and the grommet 100, The wiring workability of the 1 fuel hose 95 can be further improved, and the connection work of the pipe line means 94 to the fuel pump 84 becomes easy.

  Since the female joint 105 of the first quick connector 101 is provided in the second fuel hose 96 constituting the pipe means 94 together with the first fuel hose 95, the pipe line is connected by the first fuel hose 95 having the male joint 104. A normal type second fuel hose 96 in which only an arbitrary range of the means 94 is configured and the female joint 105 is provided in other ranges can be used.

  A fuel pump 84 is attached to the upper surface of the fuel tank 40, and the fuel pump 84, a connecting portion of the discharge pipe 87 of the fuel pump 84 and the first fuel hose 95, and the cylindrical member 98 of the first fuel hose 95 are connected. Since the pump cover 110 that covers the insertion portion to the upper end from above is attached to the upper surface of the fuel tank 40, unnecessary contact with the connection portion of the first fuel hose 95 to the fuel pump 84 side in the pipe line means 94 is prevented. can do.

  In addition, a support stay 116 that extends rearward is fixed to the body frame F behind the head pipe 22 and is connected to a leg shield 129 that covers both the left and right feet of the occupant sitting on the occupant seat 41 from the front. The center cover 130 that covers a part of the frame F covers the electronic control unit 117, the regulator 118, and the bank angle sensor 119, which are electrical components, and is therefore dedicated to cover the electronic control unit 117, the regulator 118, and the bank angle sensor 119. No parts are required, and the number of parts can be reduced, contributing to cost reduction.

  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. It is.

Left side view of motorcycle 1 is an enlarged view of the main part of FIG. Left side view showing enlarged front part of motorcycle Left side view showing a partial configuration of the intake system 5 arrow view of FIG. 6-6 sectional view of FIG. Plan view showing a partial configuration of the exhaust system Sectional view taken along line 8-8 in FIG. Left side view with partial cutout near fuel tank Fig. 9 is a cross-sectional view taken along line 10-10 of Fig. 9 with the passenger seat and the pump cover omitted. Longitudinal section showing fuel hose connection structure Partially cut away left side view showing enlarged front part of body frame A perspective view of the electrical components attached to the main frame as viewed from the right rear Left side view of stay 15 arrow view of FIG. 16 arrow view of FIG.

30... Engine body 43... Air cleaner 44... Connecting tube 44 b... First descending pipe portion 44 c. 48 ... Cleaner case 49 ... Upper case 50 ... Lower case 54 ... Cleaner element 55 ... Unpurified chamber 56 ... Purified chamber 60 ... Upstream connecting pipe 61 ... Downstream Side connection tube 62 ... Tube 66 as intermediate tube ... Breather tube F ... Body frame

Claims (5)

An engine main body (30) and an air cleaner (43) are mounted on the vehicle body frame (F), and a connecting tube (45) is provided between the fuel injection device (45) for supplying fuel to the engine main body (30) and the air cleaner (43). 44) in the vehicle engine intake system connected via
The connecting tube (44) includes an upstream connecting pipe (60) whose upstream end is connected to the air cleaner (43), and an intermediate tube whose upstream end is connected to the downstream end of the upstream connecting pipe (60). and 62) are divided structure out to the downstream end downstream connecting pipe downstream end Ru is connected to the fuel injection device upstream end connected and (45) and (61) of the intermediate tube (62), the upstream connection pipe (60), as oriented obliquely right towards and backwards lies a position offset rearwardly and the right to a downstream end upstream end of it, have been curved,
Said intermediate tube (62), together with an upstream side half portion of the intermediate tube (62) is extended to the rear side while curved in a convex shape on the right side, the intermediate tube (62), on the upstream side half portion downstream halves successive, extends obliquely left side toward the front side is inverted from the upstream half portion,
Left the downstream connecting pipe (61), the addition to extending from the downstream end of the intermediate tube (62) downward, an intermediate portion following the extending portion, bent to the right side with respect to the extending portion An air intake device for a vehicle engine characterized by extending in a direction .   The intake device for a vehicle engine according to claim 1, wherein the intermediate tube (62) is formed by blow molding of synthetic resin. The fuel injection device (45) and the engine main body (30) are disposed below the air cleaner (43), and are formed in the upstream half of the intermediate tube ( 62 ), and the upstream connection pipe (60). The first downcomer pipe part (44b) for guiding the air from the lower part and the downstream half of the intermediate tube ( 62 ) so as to invert air from the lower end of the first downcomer pipe part (44b) A rising pipe part (44c) formed by a part of the part, and the remaining part of the downstream half of the intermediate tube ( 62 ) so as to be reversed from the upper end of the rising pipe part (44c) and to guide air downward And a second downcomer pipe part (44d) formed by the downstream connection pipe (61) and connected to the fuel injection device (45) is provided in the connecting tube (44), and the engine body (30 ) Extended from the side Breather tube (66), characterized in that it is connected to the connecting portion of the first downcomer portion (44b) and said riser portion (44c), an intake apparatus according to claim 1 or 2 for a vehicle engine according .   A cleaner case (48) of the air cleaner (43) is supported by the vehicle body frame (F) and connected to the upstream connecting pipe (60), and the upper case (49). A cleaner element comprising a lower case (50) which is detachably attached and divides the cleaner case (48) into an unpurified chamber (55) and a purification chamber (56) leading to the upstream connection pipe (60) ( 54) is housed in the cleaner case (48), enabling maintenance work with the lower case (50) removed from the upper case (49). 4. The intake device for a vehicle engine according to any one of 3 above. An engine main body (30) and an air cleaner (43) are mounted on the vehicle body frame (F), and a connecting tube (45) is provided between the fuel injection device (45) for supplying fuel to the engine main body (30) and the air cleaner (43). 44), and the connecting tube (44) is bent and formed so as to reciprocate in the vehicle width direction.
The fuel injection device (45) and the engine main body (30) are disposed below the air cleaner (43), connected to the air cleaner (43), and guide air from the air cleaner (43) downward. 1 downcomer part (44b), ascending pipe part (44c) that reverses from the lower end of the first downcomer pipe part (44b) and guides air upward, and inverts and lowers from the upper end of the ascending pipe part (44c) A second downcomer pipe portion (44d) connected to the fuel injection device (45) so as to guide air to the connecting tube (44) is provided on the connecting tube (44) and extends from the engine body (30) side. A breather tube (66) is connected to a connecting portion of the first downcomer pipe part (44b) and the upriser pipe part (44c).

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