2011 Harley-Davidson Water Cooled Engine US Patent, concept, spy shots

12 Мар 2015 | Author: | Комментарии к записи 2011 Harley-Davidson Water Cooled Engine US Patent, concept, spy shots отключены
Norton water-cooled Classic

2011 Harley-Davidson Water Engine US Patent

2011 Water Cooled Engine US 20110114044

2011 Harley-Davidson Cooled Engine US Patent

— 2011 Harley-Davidson Cooled Engine US Patent

Harley-Davidson Water Cooled US Patent

The water cooled utilizes small double equipped with cooling and a water pump as tubes in and around the exhaust valves in the head to help with Air cooling still important to leave in place as seen in the diagram. The Harely-Davidson water engine US patent also the cooling system to be as hidden as with a flexible radiator, pump and fans designs different mounting applications.

HEAD COOLING SYSTEM

A cylinder head for a motorcycle which has a pair of cylinders in a V configuration such that the converge toward a crankshaft and such that a space is between the cylinders at an upper of each of the cylinders. The cylinder includes a base configured to be to one of the cylinders, an intake side an intake passage and an intake movable disposed within the passage, the intake side positioned adjacent the space, and an side including an exhaust and an exhaust valve movable within the exhaust passage, the side being positioned from the space.

A cooling inlet port and a cooling discharge port are located on the side. A cooling liquid runs through the cylinder to reduce an operating temperature of the head.

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Inventors: Jesse L.; (Slinger, WI) ; Carlin; S.; (Sussex, WI) ; Cain; Scott B.; WI) ; Sepic; Dan M.; (Mukwonago, WI) ; Rumpel; J.; (West Bend, WI) ; Hoffmann; G.; (Milwaukee, WI) ; Koerner; Scott A.; WI) ; Elchert; Rick W.; (Mequon, WI) ; Brian E.; (Hartland, WI) ; Balthazar; E.; (Milwaukee, WI) ; Glaja; Nicolae; SC)

Class at Publication: 123/41.82R;

International Class: F02F 20060101 F02F001/40; F02F 20060101 F02F001/42

________________________________________

1. A cylinder head for a motorcycle the motorcycle engine having a of cylinders arranged in a V configuration, that the cylinders converge a crankshaft axis and such a space is defined between the at an upper extent of each of the the cylinder head comprising: a configured to be coupled to one of the cylinders; an side including an intake and an intake valve movably within the intake passage, the side configured to be positioned the space; an exhaust side an exhaust passage and an exhaust movably disposed within the passage, the exhaust side to be positioned remote from the a cooling liquid inlet located on the intake side; a liquid discharge port on the intake side; and a cooling passage running through the head, the cooling liquid configured to reduce an operating of the cylinder head.

2. The cylinder of claim 1, wherein the inlet and the discharge port include fittings configured to be connected and with cooling liquid and return lines without the use of

3. The cylinder head of claim 1, the inlet port and the discharge are fluidly coupled by a single-loop passage that extends the exhaust valve.

4. The cylinder of claim 1, wherein the inlet and the discharge port are fluidly by a single-loop liquid passage extends around the exhaust

5. The cylinder head of claim 1, the inlet port and the discharge are spaced apart from a defined by the base of the cylinder

6. The cylinder head of claim 1, the inlet port and the discharge generally face toward the defined in the V between the cylinders.

7. The head of claim 1, wherein the port and the discharge port are on opposite sides of the intake

8. A cylinder head for a motorcycle the cylinder head comprising: an side having an intake in which an intake valve is an exhaust side having an passage in which an exhaust is positioned, wherein the exhaust has a curvature; a liquid inlet located on the intake side; a discharge port located on the side; a liquid cooling extending between the liquid port and the liquid discharge the liquid cooling passage a single-loop passage having a length, a portion of the liquid passage generally following the of the exhaust passage for at least 270 of rotation.

9. The cylinder head of 8, wherein the liquid cooling includes a first substantially portion extending from the inlet port and a second straight portion extending the liquid discharge port.

10. The head of claim 9, wherein the of the liquid cooling passage follows the contour of the exhaust is generally horseshoe-shaped.

11. The cylinder of claim 10, wherein the first and substantially straight portions are connected through a connecting having a reduced cross-sectional compared to the rest of the liquid passage.

12. The cylinder head of claim 11, the connecting passage passes a bridge portion between the passage and the exhaust passage.

13. The head of claim 8, wherein the cooling passage has a substantially cross-section along substantially its length, and no portion of the liquid passage following the curvature of the passage.

14. The cylinder head of 8, further comprising a base to abut the deck of a mating block of the motorcycle engine, the defining an opening in communication the liquid cooling passage, liquid routed through the cooling passage does not into the mating cylinder

15. A motorcycle comprising: a frame; an coupled to the frame; right and engine guards coupled to the forwardly of the engine and extending outwardly from the frame; and left leg shields coupled to the and left engine guards, a liquid cooling circuit in with the engine; and right and radiators in fluid communication the liquid cooling circuit and within the right and left leg respectively, wherein the right and leg shields include a right and a left duct, respectively, the right duct is configured to air received from the right away from the motorcycle, and the left duct is configured to air received from the left away from the motorcycle.

16. The of claim 15, wherein the liquid circuit is in fluid communication one or more cylinder heads of the and no other portion of the engine.

17. The of claim 16, wherein the liquid circuit is a precision cooling arranged specifically to cool the head in the immediate area an exhaust passage of the cylinder

18. The motorcycle of claim 15, further a thermostat and a water pump in communication with the liquid circuit, wherein the thermostat is to selectively bypass at least one of the and left radiators depending a sensed temperature of liquid within the liquid cooling and wherein the water pump is between the right and left leg at an elevation substantially lower the right and left radiators the motorcycle is in an upright position.

19. The of claim 18, wherein the engine is a engine, and the liquid cooling includes a supply header from the pump to the engine and a header running from the to the thermostat valve, and wherein the cooling circuit includes a of supply branch lines from the supply header to of a first cylinder head and a cylinder head of the V-twin and a pair of return lines from the first and second heads to the return header.

20. The of claim 19, wherein the pair of branch lines and the pair of lines are located substantially within the V of the V-twin engine.

21.

22. The motorcycle of claim 15, wherein the duct is configured to direct air from the right radiator away from the motorcycle, and the left duct is configured to air received from the left downwardly away from the

23. The motorcycle of claim 15, wherein the leg shield includes right and right rear panels together, wherein the right is defined by at least portions of the forward and right rear wherein the left leg shield left forward and left panels coupled together, and the left duct is defined by at portions of the left forward and rear panels.

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BACKGROUND

[0001] The present relates to a cooling system for an and more particularly to a liquid system for cooling cylinder of a motorcycle engine.

[0002] combustion engines used on are typically either air cooled or cooled. Air cooled engines on a flow of air over heat surfaces such as fins to the engine. Liquid cooled use a flow of a liquid (e.g. or oil) within the engine to heat from the engine, and use a exchanger, such as a radiator, to the absorbed heat in the liquid to the

SUMMARY

[0003] In one embodiment, the provides a cylinder head for a engine that has a pair of arranged in a V configuration such the cylinders converge toward a axis and such that a is defined between the cylinders at an extent of each of the cylinders. The head includes a base to be coupled to one of the cylinders, an intake including an intake passage and an valve movably disposed the intake passage, the intake configured to be positioned adjacent the and an exhaust side including an passage and an exhaust valve disposed within the exhaust the exhaust side configured to be remote from the space.

A cooling liquid inlet and a cooling liquid discharge are located on the intake side. A liquid passage runs the cylinder head to reduce an temperature of the cylinder head.

In another embodiment, the invention a cylinder head including an side having an intake in which an intake valve is an exhaust side having an passage in which an exhaust is positioned, a liquid inlet located on the intake side, and a discharge port located on the side. The exhaust passage has a

The cylinder head also a liquid cooling passage between the liquid inlet and the liquid discharge port. The cooling passage includes a passage having a measurable A portion of the liquid cooling generally follows the curvature of the passage for at least 270 degrees of

[0005] In yet another embodiment, the provides a motorcycle including a an engine coupled to the frame, and left engine guards to the frame forwardly of the engine and laterally outwardly from the and right and left leg shields to the right and left engine respectively, a liquid cooling in communication with the engine, and and left radiators in fluid with the liquid cooling and positioned within the right and leg shields, respectively. In some air passing through from the and left radiators is directed from the motorcycle by a right and air duct that is positioned the right and left lowers,

[0006] Other aspects of the will become apparent by of the detailed description and accompanying

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view of a according to one embodiment of the invention.

FIG. 2 is a front view of a of the motorcycle of FIG. 1, illustrating and left engine guards and and left leg shields, or lowers, of the

[0009] FIG. 3 is a rear of the portion of the motorcycle of FIG. 2, a liquid cooling circuit, radiator assemblies positioned the right and left lowers.

FIG. 4 is a side view of the cooling circuit and an engine of the of FIG. 1 with the leg shields

[0011] FIG. 5 is a front of the liquid cooling circuit of 4 with the engine removed.

FIG. 6 is a top view of the liquid circuit of FIG. 5.

[0013] 7 is a perspective view of the liquid circuit of FIG. 5.

[0014] 8 is an exploded perspective view of a of the engine of FIG. 4, illustrating a cylinder, a front gasket, and a cylinder head.

[0015] 9 is a rear view of the front head of FIG. 8, illustrating an side of the front cylinder

[0016] FIG. 10A is a perspective of the front cylinder head of 8, illustrating a liquid cooling

[0017] FIG. 10B is a cross-section taken along line in FIG. 10A, illustrating a of the liquid cooling passage an exhaust passage of the front head.

[0018] FIG. 10C is a taken along line in FIG. 10B, illustrating a circular cross-section of a straight of the liquid cooling passage.

FIG. 10D is a cross-section taken line 10D-10D in FIG. illustrating a substantially circular of a connecting section of the liquid passage.

[0020] FIG. 11 is a view of the front cylinder of FIG. 8, illustrating an opening on a base of the front cylinder

[0021] FIG. 12 is a perspective of a core used in the manufacture of the cylinder head and liquid passage of FIG. 10A.

FIG. 13 is a schematic view of the cooling circuit of FIG. 5, a first state of operation in liquid coolant bypasses coils of the radiator assemblies.

FIG. 14 is a schematic view to FIG. 13, illustrating a second of operation in which liquid flows through the radiator

[0024] FIG. 15 is a front view of the portion of the motorcycle of 2, illustrating the left and right

[0025] FIG. 16 is a rear view of the left and right of FIG. 15.

[0026] FIG. 17 is an view of the right lower of 15.

[0027] FIG. 18 is a cross-section taken along line in FIG. 15.

[0028] FIG. 19 is a view taken along 19-19 in FIG. 15, illustrating the air direction through the right

[0029] Before any embodiments of the are explained in detail, it is to be understood the invention is not limited in its application to the of construction and the arrangement of components set in the following description or illustrated in the drawings. The invention is capable of embodiments and of being practiced or of carried out in various ways.

Also, it is to be understood that the and terminology used herein is for the of description and should not be regarded as The use of including, comprising, or having and thereof herein is meant to the items listed thereafter and thereof as well as additional

Unless specified or limited the terms mounted, connected, and coupled and variations thereof are broadly and encompass both and indirect mountings, connections, and couplings. Further, connected and are not restricted to physical or mechanical or couplings.

DETAILED DESCRIPTION

FIG. 1 illustrates a motorcycle 10. The motorcycle 10 is a touring motorcycle 10 and a frame 12, a front wheel 14 to the frame 12 through a steering 16, and a rear wheel 18 coupled to the 12 through a swing arm assembly shown).

The motorcycle 10 includes an 20 coupled to the frame 12 and operatively to the rear wheel 18 through a 22.

[0031] With additional to FIGS. 2 and 3, the frame 12 includes a head 24 and two down tubes 26 downwardly from the steering 24 at the front end of the frame 12. The motorcycle 10 an engine guard 28 coupled to tubes 26. The engine guard 28 a top bar 30, a left side bar 32, a right bar 34, and a lower portion 36.

The lower 36 includes a left flange 38 at the end of the left side bar 32, a right 40 at the lowermost end of the right side bar 34, and a portion 42 between the right and flanges 38, 40. The top bar 30 is connected to an upper of the down tubes 26 and the left and flanges 38, 40 are connected to lower of the down tubes 26 (e.g. at the where the foot pegs or controls are mounted to the frame The engine guard 28 protects the 20 of the motorcycle 10 from contacting the in the event that the motorcycle 10 is over.

[0032] The motorcycle 10 left and right lower fairings (or lowers) 44L, 44R to the engine guard 28 such each of the lowers 44L, 44R is on a respective side of a central C of the motorcycle 10. As used herein, reference number including an L structure positioned on the left of the motorcycle 10 (from the perspective of a seated on the motorcycle 10) and each reference number including an R structure positioned on the right of the motorcycle 10.

The lowers 44L, 44R are generally in front of the area by a rider’s legs and assist in wind from the rider’s and feet when riding. lower 44L, 44R includes a panel 170L, 170R a top portion 46L, 46R, an portion 48L, 48R, an portion 50L, 50R, a portion 52L, 52R, and a portion 54L, 54R (FIG. 2).

each forward panel 170R includes a forward surface 56L, 56R and a rearward surface 58L, 58R. forward panel 170L, is generally concave such the rear facing surface 58R defines a cavity 174L, (FIG. 3).

Each central 54L, 54R includes an aperture 60R covered by a screen 62L, Each inboard portion 50R includes a vent 64L, 64R pivots about a substantially axis allowing the rider to the vent 64L, 64R to direct and the magnitude of the air passing between the 44L, 44R.

[0033] The and right lowers 44L, 44R are identical mirror images of other. The attachment of the right 44R to the right side of the engine 28 will be described in detail. The of the left lower 44L to the left of the engine guard 28 will not be but is attached in a similar manner as the lower 44R.

The forward surface 56R of the right lower 44R the outboard portion 48R includes a surface that forms a that receives the right bar 34. In addition, the top portion 46R includes a surface that forms a that receives a portion of the top bar 30.

The lower 44R also includes a top cover 66R that fastens to the top 46R and captures the portion of the top bar 30 between the surface of the top portion 46R and the top portion 66R. The configuration of the right 44R allows the right lower 44R to into the right side of the guard 28. In addition to this, the lower 44R is attached to the engine 28 with U-shaped bolts and at various locations.

[0034] 4 illustrates the engine 20, which is a internal combustion engine front and rear cylinders 68R and corresponding front and rear heads 70F, 70R. As herein, each reference including an F identifies structure to the front cylinder 68F and front head 70F and each corresponding number including an R identifies relating to the rear cylinder 68R and cylinder head 70R.

Each cylinder 68F, 68R a reciprocating piston (not and each of the cylinder heads 70R includes an intake valve 72R and an exhaust valve 74F, 74R for the flow of intake and exhaust air respective combustion chambers 10A).

The cylinders 68F, 68R the pistons therein) converge a crankshaft axis A at a lower of the engine 20, creating a space S the cylinders 68F, 68R and between the heads 70F, 70R that is larger in an upward direction. The 68F, 68R include cooling and are air cooled. The cylinder heads 70R include air cooling fins and liquid cooling passages 76R, which will be in greater detail below.

The motorcycle 10 includes a liquid system 78 that circulates a through the liquid cooling 76F, 76R of the cylinder heads 70R to remove combustion heat the cylinder heads 70F, The liquid cooling system 78, or cooling circuit, which is illustrated in FIGS.

4-7, a pump 80, a supply header 82, a of supply branch lines 84, the cooling passages 76F, a pair of return branch 86, a return header 88, and a thermostat 90 all connected in series. The liquid system 78 also includes a supply line 92, a right assembly 94R, a radiator line 96, a left radiator 94L, and a radiator return 98, which are all also connected in with the thermostat valve 90.

Each radiator assembly 94R includes radiator coil 100R, a discharge manifold 102R defining a cool of the radiator coil 100L, and an inlet manifold 104L, defining a warm side of the coil 100L, 100R, and a fan 106R adjacent the rearward of the radiator coil 100L, The radiator assemblies 94L, 94R are to the respective lowers 44L,

Specifically, the right radiator 94R is positioned within the cavity of the right lower 44R and covers the 60R from the rearwardly facing of the right lower 44R. The radiator assembly 94L is positioned the cavity 174L of the left 44L and covers the aperture 60L from the facing side of the left 44L. The radiator assemblies 94R are attached to the lowers 44L, 44R threaded fasteners that are engaged with mounting on the lowers 44L, 44R.

The pump 80 and thermostat valve 90 are to and supported by the lower portion 36 of the guard 28. The pump 80 is positioned the left and right lowers 44R at an elevation substantially lower the left and right radiator 100L, 100R when the 10 is in an upright position (FIG. 5). The of supply branch lines 84 and the of return branch lines 86 are substantially entirely within the S of the V-twin engine 20 (FIG.

4).

The liquid cooling system 78 includes a pressure cap 108 and fill 110 in fluid communication with the manifold 104R of the right assembly 94R, an overflow 112 and fill cap 114 in fluid communication the pressure cap 108, and an overflow 116 in fluid communication with the bottle 112 and the atmosphere. The liquid system 78 also includes a plug 118 on the inlet manifold of the left radiator assembly

[0039] FIGS. 8-11 the front cylinder head The rear cylinder head 70R is identical to the illustrated forward head 70F with the exception of a mirror-image thereof. The cylinder 70F includes a base 120F to face the corresponding cylinder 68F of the 20 and to be coupled thereto to define a chamber 122F (FIG.

The cylinder head 70F further an intake side 124F and an side 126F. The intake 124F includes an intake 128F and the intake valve 72F within the intake passage and movable therein. The exhaust 126F of the head 70F includes an passage 130F and the exhaust 74F disposed within the exhaust 130F and movable therein.

The valve 72F selectively provides air from the intake passage into the combustion chamber and the exhaust valve 74F selectively combustion exhaust gases the combustion chamber 122F to the passage 130F. Heat the combustion process tends to the cylinder head 70F, in the areas around the combustion 122F and the exhaust passage

[0040] As best shown in 10A, the liquid cooling 76F extends through the cylinder 70F from an inlet port to a discharge port 134F. The passage 76F extends in a single from the inlet port on the intake side 124F of the 70F toward and around the exhaust 130F and back to the discharge 134F on the intake side of the head 70F.

Liquid is not into or through the cylinders 68R whatsoever. Thus, only the heads 70F, 70R of the engine 20 are cooled by the liquid, while the 68F, 68R are strictly cooled by Furthermore, the cylinder heads 70R are designed to be precision cooled to target the area around the passages 130L, 130R.

The cooling passage 76F primarily around the exhaust passage rather than extending the entire cylinder head The cooling passage 76F has a focused and defines a measurable length which the liquid flows.

In words, the cooling passage 76F is by conduits having generally cross-sections such that the in combination define a longitudinal (not shown) that the center of the cooling passage 76F that the length of the longitudinal can be measured. This is in contrast to passages of the prior art that are by free-form-shaped cavities that do not define a longitudinal axis, or length.

[0041] Referring to FIGS. 8-11, the inlet and ports 132F, 134F are on the intake side 124F of the head 70F. The inlet and ports 132F, 134F are on the cylinder head 70F from an view looking forwardly the rear of the motorcycle 10 (FIG. 9) (or the inlet and discharge ports 134F are visible on the rear head 70R from an orthogonal looking rearwardly from the of the motorcycle 10).

The inlet and ports 132F, 134L of the cylinder head 70F each a port axis (not that exits the port in a direction, and the inlet and discharge 132R, 134R of the rear head 70R each define a axis (not shown) exits the port in a forward The inlet and discharge ports 134F are spaced apart a plane P defined by the base of the head 70F. The inlet and ports 132F, 134F are on opposite sides of the intake 128F.

[0042] As shown in 10A and 10B, the cooling passage 76F a first substantially straight 136F extending into the head 70F from the inlet 132F, a generally horseshoe-shaped 138F that extends the end of the first straight portion and generally follows the curvature of the passage 130F for at least an B (e.g.

270 degrees of rotation) to circumscribe the exhaust passage and a second straight portion that extends from the end of the portion 138F along a path to connect to the discharge 134F. A connecting section fluidly connects the interconnections of the straight portion 136F and the straight portion 140F the horseshoe-shaped portions 138F.

The section 142F passes a bridge portion 144F of the head 70F between the intake 128F and the exhaust passage and the connecting section 142F has a diameter compared to the rest of the passage 76F (FIGS. 10C and 10D). The cooling passage 76F has a substantially cross-section along substantially its length.

[0043] As illustrated in 8 and 11, a middle portion of the horseshoe-shaped 138F breaks the surface of the 120F to define an opening that exposes a portion of the cooling passage 76F. The 146F is covered by a gasket sandwiched between the base of the cylinder head 70F and a deck of the cylinder 68F when the engine 20 is

The gasket 148F inhibits of the cooling fluid from the 146F.

[0044] With to FIGS. 10A and 12, the cylinder head 70F is by a casting process that cores to define and form passages such as the intake and passages 128F, 130F. In a core 152F (FIG. is used to form the cooling 76F. The core 152F feet that are secured in the block or tooling such the core remains stationary the casting and cooling process.

The includes three feet. The and second feet are located on the of the straight portions and the third 154F is located at the base of the portion 138F. The third 154F creates the opening during the casting process.

the cylinder head 70F is cast, the are removed with water or

[0045] As shown in FIGS. 13, and 14, the coolant supply header 82 from the pump 80 to the space S the cylinders 68F, 68R. The supply header 82 splits the pair of supply branch 84 that connect the cooling 76F, 76R of the cylinder heads 70R into the liquid cooling 78. The discharge ports 134F, provide liquid coolant the cylinder heads 70F, 70R to the of return lines 86 that flow into the coolant header 88.

All of the inlet ports and ports 132F, 132R, 134R on the cylinder heads 70R are provided with quick-connect for connecting to and/or disconnecting the supply branch lines 84 and the branch lines 86 without the use of Because the inlet ports 132R and the discharge ports 134R are all located adjacent the S (inside the V of the engine 20, shown in 4), the supply and return headers 82, 86 only be routed to a single Stated another way, the and discharge ports 132F, 134F, 134R are located on the sides 124F, 124R, are positioned adjacent the space S.

[0046] During operation, the system 78 operates to circulate a through the cylinder heads 70R to cool the cylinder heads 70R. As shown in FIG. 13, in a mode of operation when the of the liquid is below a threshold the pump 80 circulates the liquid the supply header 82, through the branch lines 84, through the passages 76F, 76R, the return branch lines 86, the return header 88, and into a valve inlet 156 of the thermostat 90.

Due to the temperature of the liquid being the threshold temperature, the valve 90 is in a position to allow the liquid to through the valve 90 out a first outlet 158 to return to the pump 80. In the mode, the thermostat bypasses the and left radiator assemblies.

A second mode of operation is in FIG. 14. This mode of occurs when the temperature of the is at or above a threshold temperature.

In the mode, the pump 80 circulates the through the supply header 82, the supply branch lines 84, the cooling passages 76F, through the return branch 86 through the return header 88, and the first valve inlet 156 of the valve 90. Due to the temperature of the liquid at or above the threshold temperature, the 90 is in a second position to allow the to flow through the valve 90 and out a valve outlet 160.

the second valve outlet the fluid is directed through the supply line 92, the inlet 104R, radiator coil and discharge manifold 102R of the radiator assembly 94R, the radiator cross-over line 96, the inlet manifold 104L, coil 100L, and discharge 102L of the left radiator 94L, and back to a second inlet 162 of the thermostat valve 90. The valve inlet 162 directs the to the first valve outlet 158 leads back to the pump 80. In the mode of operation, the fans 160R are rotated to draw air the radiator coils 100L, to assist in transferring heat the liquid in the radiator coils 100R to the air passing through.

With reference to FIGS. the lowers 44L, 44R include panels 164L, 164R are coupled to the forward panels 170R such that the facing surfaces 58L, 58R of the panels 170L, 170R are to define cavities 174L, that house the radiator 94L, 94R. In addition, the panels 164L, 164R storage covers 166L, that cover and selectively access to storage cavities 176R within the lowers 44R.

The storage cavities 176R are positioned above and off from the cavities 174L, The rear panels 164L, also define ducts 172R for air exiting the radiator 94L, 94R. The ducts 172R direct air away in an direction from the motorcycle 10 that the air is directed downward and from the motorcycle and the rider’s

FIG. 17 shows the right panel 164R and the right cover 166R in relation to the cooling system 78. FIG.

17 shows adapters 168L, that fit between the left and screens 62L, 62R and the left and radiator assemblies 94L,

[0049] FIGS. 18 and 19 show the of the right radiator assembly 94R in the 174R formed in the right 44R. The arrows illustrated in lines in FIGS.

16 and 19 show clearly the path that air as it passes through the right assembly 94R, enters the 174R, and exits through the 172R.

[0050] During the duct 172R redirects air away from rider, air into a low pressure, high air flow location. Duct is designed to minimize restriction to air while maintaining clearance for the leg, foot, and motorcycle (e.g. rear brake shifter lever). The duct is positioned to expel heated air a relatively low pressure, high flow region of air stream the vehicle.

The duct 172R heated air to be carried away rider by slipstream air flow bike, with minimal rearward of the right and left 44L, 44R. The duct improves air flow performance the radiator due to a greater pressure between the air duct inlet and


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