JP2005075322A - Piping structure of motorcycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a piping structure of a motorcycle capable of facilitating piping work around an engine when compared with a conventional piping structure. <P>SOLUTION: This piping structure of the motorcycle is provided with a plurality of pipes 119a to 119e for letting fluid pass provided over front and rear parts in the vicinity of the engine of the motorcycle, and respective pipes 119a to 119e have rigid pipes 101a to 101e provided along the engine in an upper part on a rear side of the engine of the motorcycle. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a piping structure around an engine of a motorcycle.

Around the engine of a motorcycle, there are a number of locations for transferring fluids such as evaporated gasoline, liquid gasoline, evaporated cooling water, liquid cooling water, and the like, and piping is provided around the engine. The piping structure around the engine of a conventional motorcycle is often arranged around the vehicle body due to the structure of the motorcycle being narrow in width, and it is necessary to pipe it in a limited space around the engine. For this reason, a tube made of an elastic body such as rubber having high flexibility is mainly used for this tube (see Patent Document 1).
No. 5-9996

  However, in the conventional motorcycle piping structure as described above, since the elastic tube is used, the tube is easy to twist, and the tube is not generated in the manufacturing, repair or maintenance of the motorcycle. It was necessary to attach the tube, and the work of attaching the tube was troublesome. In addition, since the tubes are separate from each other, it is easy to make an attachment error, and the burden on the attaching operator is large.

  Further, since the tubes are arranged in the vicinity of the engine, these tubes are exposed to the outside. The structure of the engine and its surroundings is complex, and many parts need to be attached to or removed from these parts in the manufacture, repair, or maintenance of a motorcycle, but the tube is disposed in the vicinity of the engine. Then, it was in the way of attachment or removal of parts.

  In addition, it is not preferable that such a tube is exposed in the vicinity of the engine from the viewpoint of the aesthetic appearance of the entire motorcycle. In particular, there is no cowling that covers the periphery of the engine of the so-called American type or naked type, and this point is important in motorcycles that have an exposed engine, so that the tube is not exposed to the outside as much as possible. It has long been desired to configure.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a piping structure for a motorcycle capable of facilitating piping work around the engine as compared with the conventional art.

  Another object of the present invention is to provide a motorcycle piping structure that can facilitate attachment or removal of components around the engine.

  Still another object of the present invention is to provide a piping structure for a motorcycle that can be expected to improve the aesthetic appearance of the entire motorcycle.

  In order to solve the above problems, a motorcycle piping structure according to the present invention includes a plurality of fluid flow pipes provided in the front and rear in the vicinity of an engine of the motorcycle, each pipe of the motorcycle. A rigid pipe provided along the engine is provided on the upper rear side of the engine.

  By adopting such a configuration, since the rigid pipe is not twisted, the piping work can be facilitated as compared with the conventional case. In addition, since a plurality of pipes are grouped together at the upper rear side of the engine, the tubes are not scattered around the engine as in the conventional piping structure, and it is easy to attach or remove parts around the engine. be able to. Furthermore, the upper part of the motorcycle's rear side of the engine is more concealed than other parts around the engine, and by placing a rigid pipe along the engine in this part, the rigid pipe is exposed to the outside. This is expected to improve the aesthetic appearance of the entire motorcycle.

  In order to solve the above-described problem, the motorcycle piping structure according to the present invention includes a plurality of fluid flow pipes provided in the vicinity of the motorcycle in the vicinity of the engine. A rigid pipe provided along the transmission housing is provided on the upper side of the transmission housing disposed behind the engine of the motorcycle.

  By adopting such a configuration, since the rigid pipe is not twisted, the piping work can be facilitated as compared with the conventional case. Also, since multiple pipes are grouped together on the upper side of the transmission housing, the tubes are not scattered around the engine as in the conventional piping structure, and it is easy to attach or remove parts around the engine. Can do. Furthermore, the upper part of the motorcycle's transmission housing is more concealed than other parts around the engine, and by placing a rigid pipe along the transmission housing in this part, the rigid pipe is exposed to the outside. This is expected to improve the aesthetic appearance of the entire motorcycle.

  The term “rigidity” as used herein means that the rigid tube is rigid enough to be hardly deformed even when a force necessary for the attachment is applied to the rigid tube when the rigid tube is attached to the upper rear side of the engine or the upper side of the transmission housing. Means nature. Therefore, the rigid tube here is not limited to one having almost no elasticity, and as the material, a composite material such as metal, plastic having moderate elasticity, FRP, or the like can be used.

  Moreover, in the said invention, it is preferable to set it as the structure by which the said rigid pipe | tube is arrange | positioned under the sheet | seat. A cover for hiding the suspension for the rear wheel is often provided under the seat of the motorcycle. For this reason, this structure may cause the rigid tube to be exposed to the outside. It can be expected to further improve the aesthetic appearance of the motorcycle.

  Moreover, in the said invention, it is preferable that each rigid pipe | tube is couple | bonded integrally. With this configuration, each rigid tube can be attached to or detached from the motorcycle body only by attaching or detaching a plurality of rigid tube units to or from the motorcycle body, and each rigid tube is configured separately. This makes it possible to greatly facilitate such work.

  Moreover, in the said invention, it is preferable that the said rigid pipe | tube is metal. With this configuration, the rigid tube can be manufactured at low cost.

  In the above invention, any one of the pipes is connected to a fuel tank or a carburetor and a canister that absorbs the gasoline component of the vaporized gasoline, and the vaporized gasoline is sent from the fuel tank or the carburetor to the canister. It is preferable that it is comprised.

  Further, in this case, a separator that separates the vaporized gasoline and the liquid gasoline is provided in the front stage of the canister, and the vaporized gasoline sent from the fuel tank or the carburetor passes through the separator and enters the canister. It is preferably configured to be given.

  Further, in this case, any one of the pipes is connected to the separator and the fuel tank, and is configured to send liquid gasoline separated by the separator to the fuel tank. preferable.

  In the above invention, any one of the pipes is connected to a radiator cap and a cooling water reservoir tank, and the cooling water evaporated from the radiator cap to the reservoir tank is sent out from the reservoir tank. It is preferable that the cooling water condensed to the radiator cap is sent out.

  In the case of the motorcycle pipe structure according to the present invention, since the rigid pipe is not twisted, the pipe work can be facilitated as compared with the prior art. In addition, since the plurality of pipes are grouped together at the upper rear side of the engine or the upper side of the transmission housing, the tubes are not scattered around the engine as in the conventional piping structure. It can be easy. Furthermore, by arranging a rigid tube along the engine or transmission housing on the upper rear side of the motorcycle or on the upper side of the transmission housing, it is possible to prevent the rigid tube from being exposed to the outside. It can be expected to improve the appearance.

  Hereinafter, the piping structure of a motorcycle according to an embodiment of the present invention will be specifically described with reference to the drawings.

  FIG. 1 is a side view showing an appearance of a motorcycle having a piping structure according to an embodiment of the present invention. As shown in FIG. 1, the motorcycle 1 according to the present embodiment is of a so-called American type, is not provided with a cowling that covers the engine E, and the engine E is exposed to the side. The engine E is disposed between the front wheel 2 and the rear wheel 3 that is a driving wheel, and is attached to a frame 4 that forms a vehicle body of the motorcycle 1. A side stand 5 is provided on the left side of the frame 4. In addition, the vertical direction, the front-rear direction, and the left-right direction in the present embodiment mean the vertical direction, the front-rear direction, and the left-right direction as viewed from the driver who has boarded the motorcycle 1.

  2 is a partial cross-sectional left side view of the engine according to the embodiment of the present invention, and FIG. 3 is a partial cross-sectional right side view thereof. The engine E is a V-type two-cylinder four-cycle engine, and is provided below the two cylinders 6 and 7 and two cylinders 6 and 7 arranged in front and rear so as to form a substantially V shape in a side view. A crankcase 8 and an oil pan 9 provided below the crankcase 8. The cylinders 6 and 7 have cylinder heads 6a and 7a at the upper portions thereof, respectively, and valve operating systems (not shown) such as valves and rocker shafts.

  FIG. 4 is an exploded perspective view showing main housing parts of the engine E excluding the cylinders 6 and 7. As shown in FIG. 4, the engine E includes a left crankcase 10 and a right crankcase 11 that are paired on the left and right. The crankcase 8 is configured by the left crankcase 10 and the right crankcase 11 being abutted and fastened from the left and right. The left crankcase 10 and the right crankcase 11 are formed with a plurality of concave portions at respective opposing portions, and the edge portions forming the concave portions and the end surfaces of the wall portions are joined to each other to thereby form a plurality of internal portions. A crank chamber 20, a transmission chamber 21, an output shaft chamber 22, and a separator chamber 23, which are spaces, are formed in the crankcase 8.

  A left side portion (outer side portion) of the left crankcase 10 is recessed to the right side and is formed in a concave shape, which constitutes a part of the clutch chamber 24. An inner clutch cover 12 having a concave shape on the right side is attached to the left crankcase 10 from the left side, and the peripheral edges of the inner clutch cover 12 are joined to each other. It is attached. As a result, a clutch chamber 24 that is a space substantially closed by the left crankcase 10, the inner clutch cover 12, and the outer clutch cover 13 is formed.

  The left crankcase 10, the inner clutch cover 12, and the outer clutch cover 13 are formed with an oil reservoir 24 a whose inner bottom is recessed downward. Oil collected in the clutch chamber 24 is stored in the oil reservoir 24a.

  A cam cover 14 is attached to the front side of the right side (outer side) of the right crankcase 11. Opposite portions of the right crankcase 11 and the cam cover 14 are each recessed in a concave shape, and the peripheral edge of the cam cover 14 is joined to the joining end surface of the cam cover 14 provided on the right side of the right crankcase 11. ing. Thereby, a cam chamber 25 which is a space surrounded by the right crankcase 11 and the cam cover 14 is formed. In the cam chamber 25, a cam, a cam chain, and the like are accommodated.

  Further, an inner mission cover 15 is attached to a position near the right side of the right crankcase 11, and an outer mission cover 17 is attached to the right side of the inner mission cover 15. The inner mission cover 15 and the outer mission cover 17 constitute a transmission cover according to the present invention. Opposite portions of the right crankcase 11 and the inner mission cover 15 have a recessed shape, and the peripheral end face (joint surface according to the present invention) of the inner mission cover 15 is provided on the right side of the right crankcase 11. The inner transmission cover 15 is joined to the joining end face (joint face according to the present invention). Further, the opposing portions of the inner mission cover 15 and the outer mission cover 17 are also recessed in a concave shape, and the end surfaces of the respective peripheral edges are joined. An internal space formed by the inner mission cover 15 and the outer mission cover 17 forms an oil storage chamber 26.

  An oil pan 9 is attached to the lower part of the left crankcase 10 and the right crankcase 11. As a result, the oil pan 9 is located below the crank chamber 20 and the transmission chamber 21.

  In addition, although not shown in figure, the sealing member is interposed between each member mentioned above, and gas and a liquid do not leak from the connection location between each member.

  FIG. 5 is a VV cross-sectional view of the engine E shown in FIG. As shown in FIG. 5, in the engine E, the crank chamber 20 is located below the cylinders 6 and 7, and a transmission chamber 21 is disposed behind the crank chamber 20. The transmission chamber 21 is also used as an oil tank.

  An output shaft chamber 22 is disposed behind the transmission chamber 21, and a right side portion of the transmission chamber 21 extends rearward along the right side portion of the output shaft chamber 22. A separator chamber 23 is disposed behind the output shaft chamber 22. Further, a clutch chamber 24 is disposed on the left side of the engine E and on the left side of the crank chamber 20 and the transmission chamber 21, and an oil storage chamber 26 is disposed on the right side of the engine E and on the right side of the transmission chamber 21. Has been placed.

  The crank chamber 20, the transmission chamber 21, the output shaft chamber 22, the separator chamber 23, and the clutch chamber 24 are integrally formed by a crank case 8 formed by closing the left crank case 10 and the right crank case 11. . Accordingly, the number of parts can be reduced as compared with the case where each of the chambers 20 to 24 is configured separately, so that the engine weight and the number of assembly work steps can also be reduced. Further, the engine E can be made compact.

  FIG. 6 is a right side view of the left crankcase 10. As shown in FIG. 6, the partition wall 38 that partitions the crank chamber 20 and the clutch chamber 24 is provided with a plurality of vent holes 81 around a bearing 80 that supports the crankshaft 30. The vent hole 81 passes through the partition wall 38 and opens toward the generator 39 (see the broken line shown in FIG. 6) disposed in the clutch chamber 24.

  Therefore, gas flows back and forth between the crank chamber 20 and the clutch chamber 24 through the plurality of vent holes 81 in accordance with the pressure fluctuation in the crank chamber 20 caused by the vertical movement of the piston 33. Since the gas that has come and goes is blown to the generator 39, the generator 39 that is relatively hot can be cooled.

  The left crankcase 10 is provided with a vent hole 82 that allows communication between the upper rear end of the clutch chamber 24 and the upper portion of the output shaft chamber 22. The output shaft chamber 22 and the separator chamber 23 are partitioned by a partition wall 83. A vent hole 84 communicating the output shaft chamber 22 and the separator chamber 23 is provided at a central position in the vertical direction of the output shaft chamber 22 in the partition wall 83.

  A plurality of ribs 85 are provided in the separator chamber 23, and the ribs 85 divide the separator chamber 23 into a plurality of small spaces 86 that communicate with each other. A flow hole 87 that communicates with the transmission chamber 21 in the lower portion of the separator chamber 23 is provided in the lower portion of the partition wall 83.

  In addition, a flow hole 88 that communicates with the separator chamber 23 in the lower portion of the output shaft chamber 22 is provided in the lower portion of the partition wall 83. The output shaft chamber 22 communicates with the transmission chamber 21 through the flow holes 87 and 88. Further, a tubular joint 89 is attached to an upper position of the separator chamber 23 in the left crankcase 10, and the separator chamber 23 can communicate with the outside of the crankcase 8 through the joint 89.

  Next, the flow of blow-by gas in the engine E will be described with reference to FIG. Blow-by gas is generated in the crank chamber 20, and this blow-by gas flows into the clutch chamber 24 through a vent hole 81 provided in the partition wall 38 and is blown to the generator 39 to cool the generator 39. It flows backward in the inside (see the arrow indicated by the broken line in the figure). The blow-by gas that has flown backward flows into the output shaft chamber 22 from above through a vent hole 82 provided in the rear portion of the clutch chamber 24.

  When flowing into the output shaft chamber 22 from the vent hole 82, the output shaft chamber 22 serves as an expansion chamber, and a part of the blow-by gas is gas-liquid separated. The separated oil component flows into the separator chamber 23 through a flow hole 88 provided in the lower portion of the output shaft chamber 22, and further flows into the transmission chamber 21 through the flow hole 87.

  On the other hand, the remaining blow-by gas flows into the separator chamber 23 through the vent hole 84 provided in the output shaft chamber 22. Since the vent hole 84 is provided at a central position in the vertical direction of the output shaft chamber 22, oil separated in the output shaft chamber 22 is prevented from entering the separator chamber 23 through the vent hole 84. Can do.

  The separator chamber 23 is divided into a plurality of small spaces 86, and the blow-by gas is further separated into gas and liquid in the process of moving through the small spaces 86. As a result, the separated oil component flows to the transmission chamber 21 through a flow hole 87 provided in the lower portion of the separator chamber 23, and the separated gas component passes through the joint 89 and further through the pipe 117 (see FIG. 8). It is sent to the intake system (air cleaner, etc.).

  Thus, the blow-by gas containing the oil component is gas-liquid separated in the output shaft chamber 22 and the separator chamber 23, and the separated oil component is returned to the transmission chamber 21 forming the oil tank. The gas containing a small amount of oil is sent to the intake system, and then sent to a combustion chamber (not shown) of the engine E for combustion.

  Next, the piping structure around the engine E will be described. As shown in FIGS. 3 and 4, the portion of the crankcase 8 behind the cylinder 7, i.e., the portion constituting the transmission chamber 21, has a shape that is inclined so that the upper surface is lowered toward the rear. . And as shown in FIG. 3, the pipe coupling body 101 of the structure demonstrated below is attached to the rear-part upper surface of such a crankcase 8. FIG.

  FIG. 7 is a partially enlarged right side view showing the configuration of the pipe assembly according to the embodiment of the present invention, and FIG. 8 is a plan view showing the overall configuration of the piping structure of the motorcycle according to the embodiment of the present invention. FIG. As shown in FIG.7 and FIG.8, the pipe coupling body 101 has the five rigid tubes 101a-101e. The rigid tubes 101a to 101e are made of metal such as carbon steel and aluminum alloy, and are integrally coupled to each other by brazing. There are some undulations on the upper surface of the rear part of the crankcase 8, but each of the rigid tubes 101a to 101e is bent at a plurality of positions according to the shape of the corresponding part along the upper surface of the rear part of the crankcase 8. Has been. The pipe assembly 101 is bolted to the crankcase 8 by a mounting bracket 102 so that the respective rigid tubes 101a to 101e extend in the front-rear direction.

  As shown in FIG. 8, one end of a rubber tube 103a is connected to the front end of the rigid tube 101a arranged on the leftmost side, and the other end of the tube 103a is connected to an air cleaner (not shown). . In addition, a canister 105, a separator 106, and a reservoir tank 107 are provided behind the engine E, and a rear end of the rigid tube 101a is disposed on an upper end surface of the canister 105 via a rubber tube 104a. It is connected to the outlet 105a. In this manner, the tube 103a, the rigid tube 101a, and the tube 104a constitute the tube 119a that connects the air cleaner and the canister 105.

  FIG. 9 is a rear view showing the arrangement configuration and piping configuration of the canister 105, the separator 106, and the reservoir tank 107. As shown in FIGS. 8 and 9, a canister 105, a separator 106, and a reservoir tank 107 are arranged behind the engine E from left to right. The canister 105 has a substantially rectangular parallelepiped shape, and the above-described discharge port 105a and suction port 105c are provided on the upper end surface thereof. The canister 105 has a built-in filter (not shown) made of activated carbon or the like, absorbs the gasoline component of the vaporized gasoline sucked from the suction port 105c by the filter, and passes the filtered gas from the discharge port 105a to the air cleaner. It comes to discharge.

  The separator 106 has a substantially cylindrical shape, and an upper end surface of the separator 106 has an intake port 106c for sucking vaporized gasoline and liquid gasoline, and a delivery port 108 for sending the vaporized gasoline to the canister 105. A discharge port 106d for discharging liquid gasoline is provided in the section, and a vent 106e is provided in the lower end surface. As shown in FIG. 8, the suction port 106c of the separator 106 is connected to one end of a rubber tube 104c, and the other end of the tube 104c is arranged at the center among the five rigid tubes 101a to 101e. Connected to the rear end of the rigid tube 101c. One end of a rubber tube 103c is connected to the front end of the rigid tube 101c, and the other end of the tube 103c is connected to a fuel tank 109 (see FIG. 1). In this manner, the tube 103c, the rigid tube 101c, and the tube 104c constitute a tube 119c that connects the fuel tank 109 and the suction port 106c of the separator 106.

  One end of a rubber tube 110 is connected to the delivery port 108 of the separator 106, and the other end of the tube 110 is connected to the suction port 105 c of the canister 105. Similarly, one end of a rubber tube 104d is connected to the discharge port 106d, and the other end of the tube 104d is connected to the rear end of the rigid tube 101d arranged second from the right. . One end of a rubber tube 103d is connected to the front end of the rigid tube 101d, and the other end of the tube 103d is connected to the fuel tank 109. Thus, the tube 103d, the rigid tube 101d, and the tube 104d constitute the tube 119d that connects the fuel tank 109 and the discharge port 106d of the separator 106.

  Further, one end of a rubber tube 104e is connected to the vent 106e, and the other end of the tube 104e is connected to the rear end of the rigid tube 101e arranged on the rightmost side. One end of a rubber tube 103e is connected to the front end of the rigid tube 101e, and the other end of the tube 103e is connected to a throttle body (not shown). In this manner, the tube 103e, the rigid tube 101e, and the tube 104e constitute the tube 119e that connects the throttle body and the separator 106.

  FIG. 10 is a schematic cross-sectional view showing the configuration of the separator 106. The evaporated gasoline stored in the fuel tank 109 is sucked into the separator 106 from the suction port 106c through the tube 103c, the rigid tube 101c, and the tube 104c. Also, liquid gasoline condensed while the vaporized gasoline passes through the tube 103c, the rigid tube 101c, and the tube 104c is also given to the separator 106 from the suction port 106c. As shown in FIG. 10, the separator 106 has a structure in which three rooms 111, 112, and 113 are arranged in parallel on the upper and lower sides, and a wall 114 that separates the upper room 111 and the middle room 112 from the wall 114. A valve 115 is provided, and a wall that separates the middle chamber 112 and the lower chamber 113 is a diaphragm 116. The vent 106e is connected to the lower chamber 113, and the vent 106e communicates with the throttle body as described above. As a result, the negative pressure generated in the throttle body lowers the pressure in the lower chamber 113 and lowers the diaphragm. As a result, the internal pressure in the middle chamber 112 decreases and the valve 115 is opened. Further, since the negative pressure generated in the throttle body is pulsating, the diaphragm repeatedly moves up and down, so that the valve 115 operates to repeat opening and closing.

  As described above, vaporized gasoline and liquid gasoline are introduced into the upper chamber 111 from the suction port 106c. Further, a part of the evaporated gasoline accumulated in the upper chamber 111 is condensed here to become liquid gasoline. The liquid gasoline accumulated in the upper chamber 111 in this way is sent to the middle chamber 112 by opening the valve 115, and thus the vaporized gasoline and the liquid gasoline are separated. Liquid gasoline collected in the middle chamber 112 is returned to the fuel tank from the discharge port 106d. On the other hand, the evaporated gasoline accumulated in the upper chamber 111 is sent from the outlet 108 through the tube 110 to the inside of the canister 105 through the suction port 105 c.

  Further, as shown in FIG. 9, a cooling liquid inlet / outlet 107b is provided at the lower end of the reservoir tank 107, and one end of a rubber tube 104b is connected to the inlet / outlet 107b. As shown in FIG. 8, the other end of the tube 104b is connected to the rear end of the rigid tube 101b arranged second from the left. One end of a rubber tube 103b is connected to the front end of the rigid tube 101b, and the other end of the tube 103b is connected to a thermostat 120 provided above the engine E. In this manner, the tube 103b, the rigid tube 101b, and the tube 104b constitute a tube 119b that connects the thermostat 120 and the reservoir tank 107. With this configuration, when the water temperature of the cooling system is high, the evaporative cooling water and the liquid cooling water are sent from the thermostat 120 to the reservoir tank 107, and when the water temperature of the cooling system is low, the water tank is transferred from the reservoir tank 107 to the thermostat 120. Liquid cooling water will be returned.

  As shown in FIG. 8, a joint 89 (see FIG. 6) provided at the upper end of the crankcase 8 is connected to one end of a pipe 117 made of a rubber tube. The other end is connected to an intake system such as an air cleaner. A part of the pipe 117 may be a rigid pipe made of a rigid material such as metal, and the rigid pipe may be included in a part of the pipe combined body 101 described above.

  In addition to the above configuration, for example, surplus gasoline and rainwater collected near the fuel filler opening of the fuel tank are connected to the canister 105 from a pipe for discharging the motorcycle 1 or the intake system to the canister 105. It is also possible to provide pipes for sucking the gasoline component accumulated in the filter 105 by the negative pressure generated in the intake system and to arrange a part of these pipes on the rear upper part of the crankcase 8 as rigid pipes.

  FIG. 11 is a partially enlarged right side view showing a partial configuration of the piping structure of the motorcycle according to the embodiment of the present invention. As shown in FIG. 11, the tubes 103a to 103e extend forward from the pipe assembly 101 and are arranged above the cylinder heads 6a and 7a. The tubes 103a to 103e are covered with a fuel tank 109 from above, so that the tubes 103a to 103e are hidden by the fuel tank 109 and hardly exposed to the outside. Further, a cover 118 (see FIG. 1) for hiding the rear wheel suspension is provided at the rear of the cylinder 7 and above the crankcase 8 so as to hide the rear wheel suspension. It is not exposed to the outside.

  With the configuration as described above, a part of each of the plurality of fluid flow pipes 119a to 119e provided in the vicinity of the engine E of the motorcycle 1 is the rigid pipes 101a to 101e. Since the rigid tubes 101a to 101e are not twisted, the piping work can be facilitated as compared with the conventional case.

  Further, since the pipe assembly 101 in which the plurality of rigid tubes 101a to 101e are integrally coupled is attached to the rear upper portion of the crankcase 8, the plurality of tubes 119a to 109e are grouped together at the rear upper portion of the engine. The tubes are not scattered around the engine as in the conventional piping structure, and it is possible to easily attach or remove the parts around the engine.

  Further, since the rigid tubes 101a to 101e are integrally coupled as the pipe combined body 101, attachment or detachment of the rigid tubes 101a to 101e with respect to the motorcycle 1 main body causes the pipe combined body 101 to be attached to the motorcycle 1 main body. On the other hand, it is only necessary to attach or detach, and this work is greatly facilitated as compared with the case where each of the rigid tubes 101a to 101e is configured separately.

  In addition, since the pipe assembly 101 is hidden by the cover 118, the aesthetic appearance of the entire motorcycle 1 is improved. In particular, in the type in which the engine of an American type or the like is exposed to the outside, such as the motorcycle 1 according to the present embodiment, the number of pipes that are exposed to the outside can be reduced. It is remarkable.

  Further, since the rigid tubes 101a to 101e are made of metal, each of the rigid tubes 101a to 101e can be manufactured at a low cost.

  The rigid tubes 101a to 101e are not limited to the metal configuration, and when the rigid tubes 101a to 101e are attached to the rear upper part of the crankcase 8, a force necessary for this attachment is applied to the rigid tubes. As long as it has the property which does not show elasticity to such an extent that it is hardly deformed even if it is added to 101a to 101e, it may be made of a plastic having moderate rigidity or a composite material such as FRP.

  In the embodiment of the present invention, the configuration in which a part of the crankcase 8 is a transmission housing has been described. However, the present invention is not limited to this, and the crankcase and the transmission housing are provided separately. The pipe assembly 101 may be attached to the upper side of the transmission housing.

  Moreover, the piping structure according to the present invention is not limited to that mounted on an American type motorcycle, and can also be applied to a road racer type and other types of motorcycles. Further, the present invention is not limited to motorcycles and can be applied to engines such as four-wheel buggies and automobiles.

  Furthermore, the above-described embodiment is an embodiment, and various modifications can be made without departing from the spirit of the present invention, and the present invention is not limited to the above-described embodiment.

  The engine cooling structure according to the present invention can make piping work easier than before, and can easily attach or remove parts around the engine as compared with the conventional one. The effect of improving the aesthetic appearance of the entire motorcycle can be expected, and it is useful as a piping structure around the engine of the motorcycle.

1 is a left side view of a motorcycle equipped with an engine cooling structure according to an embodiment of the present invention. It is a partial section left side view of an engine concerning an embodiment of the invention. It is a partial section right side view of an engine concerning an embodiment of the invention. It is a disassembled perspective view which shows the main housing components of the engine except a cylinder. FIG. 5 is a VV cross-sectional view of the engine shown in FIG. 2. It is a right view of a left crankcase. It is a partial expansion right view which shows the structure of the pipe coupling body which concerns on embodiment of this invention. 1 is a plan view showing an overall configuration of a piping structure for a motorcycle according to an embodiment of the present invention. It is a rear view which shows the arrangement structure and piping structure of a canister, a separator, and a reservoir tank. It is typical sectional drawing which shows the structure of a separator. 1 is a partially enlarged right side view showing a partial configuration of a piping structure of a motorcycle according to an embodiment of the present invention.

Explanation of symbols

1 motorcycle 2 front wheel 3 rear wheel (drive wheel)
4 Frame 5 Side stand 6, 7 Cylinder 6a, 7a Cylinder head 8 Crankcase 9 Oil pan 10 Left crankcase 11 Right crankcase 12 Inner clutch cover 13 Outer clutch cover 14 Cam cover 15 Inner mission cover 17 Outer mission cover 20 Crank chamber 21 Transmission Chamber 22 Output shaft chamber 23 Separator chamber 24 Clutch chamber 24a Oil reservoir 25 Cam chamber 26 Oil storage chamber 30 Crankshaft 33 Piston 38 Bulkhead 39 Generator 80 Bearing 81 Ventilation hole 82 Ventilation hole 83 Septum 84 Ventilation hole 85 Rib 86 Small space 87 Through hole 88 Through hole 89 Joint 101 Pipe assembly 101a to 101e Rigid pipe 102 Mounting bracket 103a to 103e Tube 104a to 104 Tube 105 Canister 105a Discharge port 105c Suction port 106 Separator 106c Suction port 106d Discharge port 106e Vent port 107 Reservoir tank 107b Inlet / outlet 108 Delivery port 109 Fuel tank 110 Tube 111 Room 112 Room 113 Room 114 Wall 115 Valve 116 Diaphragm 117 Tube 118 Cover 119a-119e tube 120 thermostat

Claims (9)

Provided with a plurality of pipes for fluid flow provided in the vicinity of the motorcycle engine in the front and rear,
Each pipe is a piping structure of a motorcycle having a rigid pipe provided along the engine on the upper rear side of the motorcycle. Provided with a plurality of pipes for fluid flow provided in the vicinity of the motorcycle engine in the front and rear,
Each pipe has a rigid pipe provided along the transmission housing on the upper side of the transmission housing disposed behind the engine of the motorcycle.   The piping structure for a motorcycle according to claim 1 or 2, wherein the rigid pipe is disposed below the seat.   The motorcycle piping structure according to any one of claims 1 to 3, wherein the rigid pipes are integrally coupled.   The motorcycle pipe structure according to any one of claims 1 to 4, wherein the rigid pipe is made of metal.   Any one of the pipes is connected to a fuel tank or carburetor and a canister that absorbs the gasoline component of the evaporated gasoline, and is configured to deliver the evaporated gasoline from the fuel tank or carburetor to the canister. Item 6. A motorcycle piping structure according to any one of Items 1 to 5.   A separator for separating the vaporized gasoline and the liquid gasoline is provided in the front stage of the canister, and the vaporized gasoline sent from the fuel tank or the carburetor passes through the separator and is provided to the canister. The motorcycle piping structure according to claim 6.   8. The motorcycle according to claim 7, wherein any one of the pipes is connected to the separator and the fuel tank, and configured to deliver liquid gasoline separated by the separator to the fuel tank. Piping structure. Any one of the pipes is connected to a radiator cap and a cooling water reservoir tank, and the cooling water evaporated from the radiator cap to the reservoir tank is sent and condensed from the reservoir tank to the radiator cap. The piping structure for a motorcycle according to any one of claims 1 to 8, wherein

Images