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WO2012057159A1 - Automatic two-wheeled vehicle - Google Patents

Automatic two-wheeled vehicle Download PDF

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Publication number
WO2012057159A1
WO2012057159A1 PCT/JP2011/074580 JP2011074580W WO2012057159A1 WO 2012057159 A1 WO2012057159 A1 WO 2012057159A1 JP 2011074580 W JP2011074580 W JP 2011074580W WO 2012057159 A1 WO2012057159 A1 WO 2012057159A1
Authority
WO
WIPO (PCT)
Prior art keywords
main frame
head pipe
vehicle
frame
bulging
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2011/074580
Other languages
French (fr)
Japanese (ja)
Inventor
正人 中田
英亮 中川
俊宏 池長
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Priority to BR112013010386-8A priority Critical patent/BR112013010386B1/en
Priority to CN201180051413.7A priority patent/CN103180201B/en
Priority to JP2012540887A priority patent/JP5442132B2/en
Publication of WO2012057159A1 publication Critical patent/WO2012057159A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K11/00—Motorcycles, engine-assisted cycles or motor scooters with one or two wheels
    • B62K11/02—Frames
    • B62K11/04—Frames characterised by the engine being between front and rear wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K19/00—Cycle frames
    • B62K19/02—Cycle frames characterised by material or cross-section of frame members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K19/00—Cycle frames
    • B62K19/02—Cycle frames characterised by material or cross-section of frame members
    • B62K19/04—Cycle frames characterised by material or cross-section of frame members the material being wholly or mainly metallic, e.g. of high elasticity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K19/00—Cycle frames
    • B62K19/18—Joints between frame members
    • B62K19/20—Joints between frame members welded, soldered, or brazed

Definitions

  • the present invention relates to a motorcycle.
  • a vehicle body frame (8) of a motorcycle (numbers in parentheses indicate reference numerals described in Patent Document 1. The same applies hereinafter) is an engine (10) in a vehicle side view.
  • the so-called cradle type in which each frame is arranged to surround the
  • the vehicle body frame (8) is a head pipe (31), a main frame (29) extending substantially horizontally from the head pipe (31) to the rear of the vehicle, and then curved downward, and a main frame (29) And a rear arm bracket (30) extending downward to support the rear arm (12), and a down tube extending downward from the head pipe (31) and then extending rearward of the vehicle and being connected to the rear arm bracket (30) (23) and are the main elements.
  • An engine (10) is fastened to the main frame (29), the down tube (23) and the rear arm bracket (30).
  • the main frame (29) is extended rearward of the vehicle above the cylinders (15, 16) of the engine (10). Because the cylinders (15, 16) and the main frame (29) are close to each other, when performing maintenance around the cylinders (15, 16), it was necessary to remove the engine (10) from the vehicle body frame (8) .
  • An embodiment of the present invention provides a motorcycle capable of maintaining good maintainability of the engine while making the front wheel steering device compact, even when the engine having a large dimension in the height direction is mounted.
  • the motorcycle is provided with a head pipe 12 for steerably supporting a front fork 21 rotatably supporting the front wheel 13, a main frame 31 extending from the head pipe 12 to the rear of the vehicle, and
  • the engine 15 is disposed below the main frame 31 and has a crankcase 32 and a cylinder 33 extending obliquely upward from the crankcase 32 and a front portion of the main frame 31 in a side view of the vehicle And a detour portion 56 extending obliquely upward and rearward of the vehicle and detouring the upper surface of the cylinder 33.
  • FIG. 1 is a left side view of a motorcycle according to a first embodiment. It is a principal part enlarged view of FIG.
  • FIG. 3 is a view on arrow 3 of FIG. 2; It is a figure explaining the component of a body frame. It is a left view of a body frame. It is a perspective view of a vehicle body frame.
  • FIG. 10 is a left side view of a vehicle body frame of the motorcycle of the second embodiment.
  • FIG. 8 is a cross-sectional view taken along line 8-8 of FIG. 7; 9 is a cross-sectional view taken along line 9-9 of FIG. 7;
  • the motorcycle 10 includes a vehicle body frame 11 having a head pipe 12 at its front end, a front wheel steering device 14 provided with a front wheel 13 so as to be steerable to the head pipe 12, An engine 15 suspended by the frame 11 and a rear wheel suspension system 18 having a rear wheel 17 extended rearward of the vehicle from the body frame 11 and located behind the engine 15 and driven by the engine 15 are main components. .
  • the head pipe 12 is a member that supports the front wheel steering device 14 in a steerable manner.
  • the front wheel steering device 14 comprises a front wheel 13, a front fork 21 rotatably supporting the front wheel 13, and a steering wheel 22 attached to an upper end of the front fork 21 and steered by a driver.
  • a front cowl 24 is attached to the front fork 21, and a headlight 25 is attached to the front cowl 24.
  • the rear wheel suspension system 18 comprises a swing arm 27 extended rearward from the vehicle body frame 11 and pivotally supporting the rear wheel 17 and a cushion unit 28 passed between the swing arm 27 and the vehicle body frame 11 .
  • An engine 15 is disposed below the main frame 31 which is a component of the vehicle body frame 11.
  • the engine 15 has a crankcase 32 and a cylinder 33 extending obliquely upward from the crankcase 32.
  • a throttle valve 37 is connected to the rear wall 34 of the cylinder 33, and an air cleaner unit 38 is connected to the rear of the throttle valve 37.
  • An exhaust pipe 41 is connected to the front wall 35 of the cylinder 33, and the exhaust pipe 41 turns in the rearward direction of the vehicle and extends.
  • a silencer 42 is connected to a rear end of the exhaust pipe 41.
  • a fuel tank 43 is disposed rearward of the steering wheel 22 in the vehicle, and a seat 44 on which an occupant sits is disposed so as to be continuous with the fuel tank 43 rearward of the vehicle.
  • the fuel tank 43 and the seat 44 are both supported by the vehicle body frame 11.
  • a guard member 45 is suspended from the vehicle body frame 11 to the rear of the rear cushion unit 28 at a position on the rear side of the vehicle.
  • 46 is a rear fender.
  • a main frame 31 extends from the head pipe 12 to the rear of the vehicle.
  • a detour portion 56 is provided on the front portion 51 of the main frame, and extends from the lower end 52 of the rear surface of the head pipe obliquely upward to the rear of the vehicle to bypass the upper surface 55 of the cylinder.
  • the main frame 31 is provided with a bulging portion 57 that bulges above the rear surface upper end 53 of the head pipe in the bypass portion 56.
  • a tank mounting portion 61 for mounting the fuel tank 43 is provided at the bulging portion 57.
  • the fuel tank 43 is provided to straddle the main frame 31, the front of the fuel tank 43 is attached to the bulging portion 57, and the rear of the fuel tank 43 is attached to the main frame 31 via the bracket 62. There is.
  • the bulging portion 57 is provided at the detour portion 56 so as to bulge above the upper end 53 of the rear surface of the head pipe. Assuming that the front portion of the fuel tank 43 is supported behind the bypass portion 56, the length of the fuel tank 43 in the longitudinal direction of the vehicle is reduced, which affects the tank capacity.
  • the bulging portion 57 of the embodiment is provided at the front portion 63 of the detour portion, if the bulging portion 57 supports the front portion of the fuel tank 43, the length of the fuel tank 43 in the vehicle longitudinal direction And the tank capacity can be easily secured.
  • one main frame 31 is extended around the center in the width direction of the vehicle, and a bypass portion 56 is formed at the front of the main frame 31.
  • the front end of the fuel tank 43 is fastened to the bulging portion 57 by a fastening member 65.
  • the bulging portion 57 extends upward, that is, toward the front side in the drawing.
  • a plate-like bracket 62 extending in the vehicle width direction is attached to the rear of the main frame 31, a tank rear attachment portion 60 is provided on the bracket 62, and the rear portion of the fuel tank 43 is attached to the fastening member 65 in these tank rear attachment portions 60. It is concluded through.
  • the bulging portion 57 is disposed rearward of the head pipe 12 via the space 66.
  • a steering handle 22 is disposed above the head pipe 12. Since the steering handle 22 and the bulging portion 57 are separated, the shape freedom of the steering handle 22 is increased.
  • the seat rail 67 extends from the vicinity of the rear fastening position 47 of the fuel tank 43 toward the rear of the vehicle, and the air cleaner unit 38 is disposed on the left and right sides of the seat rail 67 in the vehicle width direction.
  • the dirty side 71 of the air cleaner unit 38 is disposed on the right side in the vehicle width direction of the air cleaner unit 38, and the clean side 72 of the air cleaner unit 38 is similarly disposed on the left side in the vehicle width direction.
  • 73 is extended, and a throttle valve 37 is connected to the front end of the connecting tube 73.
  • the vehicle body frame 11 includes a head pipe 12, a main frame 31 joined to the rear surface of the head pipe 12, a down frame 76 connected to the lower portion of the main frame 31, and a main frame A seat rail 67 and a pivot frame 77 joined to the rear end of 31 and a sub frame 78 passed between the seat rail 67 and the pivot frame 77 are main elements.
  • the main frame 31 is composed of a gusset member 81 extended to the vehicle rear of the head pipe 12 and constituting the detour 56 and a center frame 82 extended to the vehicle rear of the gusset member 81.
  • the bulging member 58 as the bulging portion 57 is attached to the upper surface 83 of the gusset member, and the reinforcing member 84 is joined between the rear surface of the bulging member 58 and the upper surface 83 of the gusset member.
  • the main frame 31 is a combination of the gusset member 81 and the center frame 82, the shape of each component part is simplified. As a result, the manufacturing cost of each part can be reduced.
  • the vehicle body frame 11 includes a head pipe 12 and a gusset member 81 extended from the head pipe 12, a down frame 76 extended obliquely backward from the lower end of the gusset member 81, and a gusset member A center frame 82 extending rearward from the rear end of the seat 81, a seat rail 67 extending substantially horizontally from the rear end of the center frame 82 to the rear of the vehicle, and a pivot frame 77 extending downwardly depending on the seat rail 67 And the sub frame 78 passed between the lower part of the pivot frame 77 as the main element.
  • a main frame 31 extends from the head pipe 12 to the rear of the vehicle.
  • the bulging member 58 is joined to the upper surface 83 of the gusset member 81 constituting the front portion of the main frame 31. That is, the bulging member 58 is joined to the upper surface 85 of the main frame by welding.
  • the bulging member 58 is manufactured separately from the main frame 31 and is later joined.
  • the main frame 31 has a simple shape, and the manufacturing of the main frame 31 is facilitated.
  • the bulging member 58 is similarly simplified in shape, and the manufacture of the bulging member 58 is facilitated.
  • the bulging member 58 as the bulging portion may be joined to the upper surface 85 of the main frame by bolting. In this case, the bulging member may be unnecessary depending on the model, and the bulging member 58 can be removed from the main frame 31 as needed.
  • each of the main frame 31, the down frame 76, the pivot frame 77, and the seat rail 67 extends in the longitudinal direction of the vehicle at the center in the vehicle width direction.
  • the subframes 78L and 78R are passed laterally in the vehicle width direction.
  • the gusset members 81L and 81R are a pair of left and right plate-like members, the center frame 82 and the down frame 76 have a rectangular cross section, and the pivot frame 77, the seat rail 67 and the sub frame 78 have a U shaped cross section.
  • a lower portion of the down frame 76 is provided with a first collar member 93 constituting a fastening portion to the engine, and an intermediate portion in the height direction of the pivot frame 76 is provided with an engine bracket 94 to which the rear upper portion of the engine is fastened.
  • the lower end portion of the pivot frame 76 is provided with a second collar member 95 to which the rear lower portion of the engine is fastened.
  • the pivot frame 76 is provided with a third collar member 96 to which the sub frames 78L and 78R are joined between the engine bracket 94 and the second collar member 95.
  • the subframes 78L and 78R are respectively provided with fourth collar members 97L and 97R to which the upper ends of the cushion units are attached. Further, at the rear end of the seat rail 67, a fifth collar member 98 for fixing the rear of the vehicle is provided.
  • a detour 56 is provided at the front of the main frame 31 and extends obliquely upward from the lower end 52 of the rear end of the head pipe to the rear of the vehicle to detour the upper surface 55 of the cylinder.
  • the main frame In the conventional structure in which the main frame extends from the head pipe, when the size in the height direction of the engine is large, the main frame needs to be raised and the head pipe also needs to be raised in conjunction. Alternatively, to lower the head pipe, it is necessary to reduce the height dimension of the engine.
  • the main frame 31 is extended through the detour portion 56 which detours the upper surface 55 of the cylinder from the head pipe 12. That is, by adopting the detour portion 56, the head pipe 12 can be disposed at a low position, and the main frame 31 can be disposed at a high position. When the main frame 31 is in the high position, the maintainability of the engine 15 is enhanced. If the head pipe 12 is at the low position, the front wheel steering device 14 can be made compact, for example, by reducing the diameter of the front wheel 13.
  • the main frame 31 is provided with a bulging portion 57 that bulges above the rear surface upper end 53 of the head pipe 12 in the bypass portion 56.
  • the detour portion 56 is located at a lower position toward the front of the vehicle, which makes it difficult to attach the in-vehicle component to the front of the main frame 31.
  • the bulging portion 57 since the bulging portion 57 is provided, the mounting site becomes high, and the mounting of the on-vehicle component becomes easy.
  • the vehicle body frame 11 includes a head pipe 12, a main frame 31 that extends diagonally rearward and upward from the head pipe 12, and then extends diagonally downward and backward, and the head pipe 12.
  • Rear end lower end 52 and a lower end of the main frame 31 are connected to a connecting member 87, the lower end of the lower end of the connecting member 87 extends diagonally to the rear, and a rear end 88 of the main frame extends rearward
  • a seat rail 67 and a pivot frame 77 extending downward from the rear end 88 of the main frame are main elements.
  • main frame 31 is a pipe frame 89 having a circular cross section and extending to the rear of the vehicle of the head pipe 12, and the pipe frame 89 extends to the rear of the vehicle so as to include the seat rail 67. It is the point being
  • the connecting portion 91 to the head pipe 12 is attached so as to change the sectional shape in the height direction and to sandwich the head pipe 12 in the vehicle width direction. ing.
  • the main frame 31 having a circular cross section is formed by one, and can be attached to the head pipe 12 by changing the cross sectional shape. Therefore, the number of elements of the vehicle body frame 11 can be reduced, and the cost can be reduced.
  • the seat rail 67 is deformed in cross section from a circular shape to a horizontally long flat shape.
  • the pipe frame 89 is extended to the rear of the vehicle so as to include the seat rail 67, and the seat rail 67 is deformed from a circular shape to a horizontally long flat shape in section, so that the sheet receiver, rear fender, tray, electric parts, etc. Each component part is easy to attach.
  • the present invention is applied to a two-wheeled motor vehicle in the embodiment, the present invention is also applicable to a three-wheeled vehicle, and may be applied to general vehicles. Further, according to the embodiment, it is acceptable to omit the bulging portion that bulges upward from the bypass portion.
  • the motorcycle includes a head pipe rotatably supporting a front fork rotatably supporting a front wheel, a main frame extending rearward of the vehicle from the head pipe, and a crank disposed below the main frame
  • An engine having a case and a cylinder extending obliquely upward from the crankcase, and a detour provided at the front of the main frame in a side view of the vehicle and extending diagonally upward from the lower end of the rear face of the head pipe to bypass the upper surface of the cylinder It may have a part.
  • the front portion of the main frame is provided with a detour that extends obliquely upward in the rear of the vehicle from the lower end of the rear surface of the head pipe and detours the upper surface of the cylinder.
  • the main frame In the conventional structure in which the main frame extends from the head pipe, when the size in the height direction of the engine is large, the main frame needs to be raised and the head pipe also needs to be raised in conjunction.
  • the main frame is extended from the head pipe via a detour portion which detours the cylinder upper surface.
  • the head pipe can be disposed at the low position, and the main frame can be disposed at the high position.
  • the mainframe is at a high position, the maintainability of the engine is enhanced.
  • the front wheel steering device can be made compact, for example, by reducing the diameter of the front wheel.
  • the main frame may be provided with a bulging portion which bulges above the rear surface upper end of the head pipe above the detouring portion.
  • the detour portion is located lower toward the front of the vehicle, which makes it difficult to mount the in-vehicle component on the front of the main frame.
  • the main frame is provided with a bulging portion which bulges upward beyond the upper end of the rear surface of the head pipe above the detouring portion.
  • the main frame may be provided with the fuel tank
  • the bulging portion may be provided with a tank mounting portion for attaching the front portion of the fuel tank. Assuming that the front portion of the fuel tank is supported behind the bypass portion, the length of the fuel tank in the longitudinal direction of the vehicle is reduced, which affects the tank volume.
  • the bulging portion is provided at the front of the detouring portion, if the front portion of the fuel tank is supported by the bulging portion, the length of the fuel tank in the vehicle longitudinal direction is It becomes large and a predetermined tank capacity can be easily secured.
  • the bulging portion may be disposed rearward of the vehicle through the space from the head pipe.
  • a steering handle is disposed above the head pipe. According to this structure, since the steering handle and the bulging portion are separated, the degree of freedom in the shape of the steering handle is increased.
  • the bulging portion may be joined to the upper surface of the main frame by welding or bolting.
  • the bulging member is manufactured separately from the main frame and is later joined.
  • the main frame has a simple shape, which facilitates the manufacture of the main frame.
  • the bulging member also has a simple shape, and the bulging member can be easily manufactured.
  • the bulging member may be unnecessary, and the bulging member can be removed from the main frame as needed.
  • the main frame may be composed of a gusset member extended to the vehicle rear of the head pipe and a center frame extended to the vehicle rearward of the gusset member, and the gusset member And the bulging portion may be attached to the upper surface of the gusset member.
  • the main frame may be a pipe frame having a circular cross section and extending toward the vehicle rear of the head pipe, and the connection portion with the head pipe at the front end of the main frame has a cross sectional shape in the height direction. It may be attached so as to sandwich the head pipe from the vehicle width direction while changing it.
  • the main frame having a circular cross section is formed by one piece, and can be attached to the head pipe by changing the cross sectional shape. Therefore, the number of elements of the vehicle body frame can be reduced and the cost can be reduced.
  • the pipe frame may be extended to the rear of the vehicle so as to include the seat rail, and the seat rail may be deformed in cross section from a circular shape to a horizontally long flat shape.
  • the pipe frame is extended to the rear of the vehicle so as to include the seat rail, and the seat rail portion is deformed from a circular shape to a horizontally long flat shape in section, so the sheet receiver, rear fender, tray, It is easy to attach each component parts such as electric parts.
  • the present invention is suitable for a motorcycle.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automatic Cycles, And Cycles In General (AREA)

Abstract

Provided is an automatic two-wheeled vehicle, comprising: a head pipe (12) that steerably supports front forks (21) that rotatably support a front wheel (13); a main frame (31) that extends in the vehicle rear direction from this head pipe (12); an engine (15) with a crank case (32) arranged in the lower part of this main frame (31) and a cylinder (33) that extends diagonally upwards from this crank case (32); and a bypass section (56) disposed in the front section of the main frame (31), when viewed from the vehicle side surface, and extends from the bottom tip of the rear surface of the head pipe (12) diagonally upwards towards the vehicle rear, and bypasses the upper surface of the cylinder (33).

Description

自動二輪車Motorcycle

　本発明は、自動二輪車に関する。 The present invention relates to a motorcycle.

　メインフレームの下方にエンジンが配置されている自動二輪車が知られている（例えば、特許文献１（図５）参照。）。 There is known a motorcycle in which an engine is disposed below the main frame (see, for example, Patent Document 1 (FIG. 5)).

　特許文献１の図５に示されるように、自動二輪車の車体フレーム（８）（括弧付き数字は、特許文献１記載の符号を示す。以下同じ。）は、車両側面視で、エンジン（１０）を取り囲むように各フレームを配置したいわゆるクレードル型と云われるものでる。 As shown in FIG. 5 of Patent Document 1, a vehicle body frame (8) of a motorcycle (numbers in parentheses indicate reference numerals described in Patent Document 1. The same applies hereinafter) is an engine (10) in a vehicle side view. The so-called cradle type in which each frame is arranged to surround the

　車体フレーム（８）は、ヘッドパイプ（３１）と、このヘッドパイプ（３１）から車両後方へ略水平に延ばされ、その後、下方に湾曲されるメインフレーム（２９）と、メインフレーム（２９）から下方に延びてリヤアーム（１２）を支持するリヤアームブラケット（３０）と、ヘッドパイプ（３１）から下方へ延ばされ、その後、車両後方へ延ばされリヤアームブラケット（３０）に連結されるダウンチューブ（２３）と、を主要素とする。前記メインフレーム（２９）、ダウンチューブ（２３）及びリヤアームブラケット（３０）に、エンジン（１０）が締結されている。 The vehicle body frame (8) is a head pipe (31), a main frame (29) extending substantially horizontally from the head pipe (31) to the rear of the vehicle, and then curved downward, and a main frame (29) And a rear arm bracket (30) extending downward to support the rear arm (12), and a down tube extending downward from the head pipe (31) and then extending rearward of the vehicle and being connected to the rear arm bracket (30) (23) and are the main elements. An engine (10) is fastened to the main frame (29), the down tube (23) and the rear arm bracket (30).

　ところで、特許文献１の自動二輪車では、メインフレーム（２９）は、エンジン（１０）のシリンダ（１５、１６）の上方にて車両後方へ延ばされている。シリンダ（１５、１６）とメインフレーム（２９）とは近接しているため、シリンダ（１５、１６）周りのメンテナンスをするときは、エンジン（１０）を車体フレーム（８）から取り外す必要があった。 Incidentally, in the motorcycle of Patent Document 1, the main frame (29) is extended rearward of the vehicle above the cylinders (15, 16) of the engine (10). Because the cylinders (15, 16) and the main frame (29) are close to each other, when performing maintenance around the cylinders (15, 16), it was necessary to remove the engine (10) from the vehicle body frame (8) .

　エンジン（１０）のメンテナンス性を高める手段として、メインフレーム（２９）を上方に移動させ、シリンダ（１５、１６）とメインフレーム（２９）の間に空間を確保することが考えられる。しかし、メインフレーム（２９）を上方に移動させると、ヘッドパイプ（３１）の高さが高位置となり、前輪の径が大きくなる等前輪操向装置が大型化するという問題があった。 As a means for enhancing the maintainability of the engine (10), it is conceivable to move the main frame (29) upward to secure a space between the cylinders (15, 16) and the main frame (29). However, when the main frame (29) is moved upward, the height of the head pipe (31) is at a high position, and the diameter of the front wheel is increased.

日本国特開２００６－１５８３７公報Japanese Patent Application Laid-Open No. 2006-15837

　本発明の実施例は、前輪操向装置をコンパクトにしつつ、高さ方向寸法の大きなエンジンを搭載する場合であっても、エンジンのメンテナンス性を良好に保つことができる自動二輪車を提供する。 An embodiment of the present invention provides a motorcycle capable of maintaining good maintainability of the engine while making the front wheel steering device compact, even when the engine having a large dimension in the height direction is mounted.

　本発明の実施例によれば、自動二輪車は、前輪１３を回転自在に支えるフロントフォーク２１を操向可能に支持するヘッドパイプ１２と、このヘッドパイプ１２から車両後方へ延びるメインフレーム３１と、このメインフレーム３１の下方に配置されクランクケース３２及びこのクランクケース３２から斜め上へ延びるシリンダ３３を有するエンジン１５と、車両側面視で、メインフレーム３１の前部に設けられ、ヘッドパイプ１２後面下端から車両後方斜め上方へ延ばされシリンダ３３の上面を迂回する迂回部５６と、を備えてもよい。 According to the embodiment of the present invention, the motorcycle is provided with a head pipe 12 for steerably supporting a front fork 21 rotatably supporting the front wheel 13, a main frame 31 extending from the head pipe 12 to the rear of the vehicle, and The engine 15 is disposed below the main frame 31 and has a crankcase 32 and a cylinder 33 extending obliquely upward from the crankcase 32 and a front portion of the main frame 31 in a side view of the vehicle And a detour portion 56 extending obliquely upward and rearward of the vehicle and detouring the upper surface of the cylinder 33.

実施例１に係る自動二輪車の左側面図である。FIG. 1 is a left side view of a motorcycle according to a first embodiment. 図１の要部拡大図である。It is a principal part enlarged view of FIG. 図２の３矢視図である。FIG. 3 is a view on arrow 3 of FIG. 2; 車体フレームの構成要素を説明する図である。It is a figure explaining the component of a body frame. 車体フレームの左側面図である。It is a left view of a body frame. 車体フレームの斜視図である。It is a perspective view of a vehicle body frame. 実施例２の自動二輪車の車体フレームの左側面図である。FIG. 10 is a left side view of a vehicle body frame of the motorcycle of the second embodiment. 図７の８－８線断面図である。FIG. 8 is a cross-sectional view taken along line 8-8 of FIG. 7; 図７の９－９線断面図である。9 is a cross-sectional view taken along line 9-9 of FIG. 7;

　以下、実施例について、詳細に説明する。実施例は発明の例示であって、発明を限定するものではなく、実施例に記述される全ての特徴やその組み合わせは、必ずしも発明の本質的なものであるとは限らない。図中及び実施例において、「上」、「下」、「前」、「後」、「左」、「右」は、各々、自動二輪車に乗車する運転者から見た方向を示す。なお、図面は符号の向きに見るものとする。 Hereinafter, examples will be described in detail. The examples are illustrative of the invention and do not limit the invention, and all the features and combinations thereof described in the examples are not necessarily essential to the invention. In the drawings and the embodiments, “upper”, “lower”, “front”, “rear”, “left”, and “right” indicate directions as seen from a driver riding on a motorcycle. The drawings should be viewed in the direction of the reference numerals.

　実施例１を図面に基づいて説明する。
　図１に示されているように、自動二輪車１０は、前端部にヘッドパイプ１２を有する車体フレーム１１と、ヘッドパイプ１２に操向可能に設けられ前輪１３を有する前輪操向装置１４と、車体フレーム１１に懸架されるエンジン１５と、車体フレーム１１から車両後方に延ばされると共にエンジン１５の後方に位置しエンジン１５に駆動される後輪１７を有する後輪懸架装置１８と、を主要素とする。 Example 1 will be described based on the drawings.
As shown in FIG. 1, the motorcycle 10 includes a vehicle body frame 11 having a head pipe 12 at its front end, a front wheel steering device 14 provided with a front wheel 13 so as to be steerable to the head pipe 12, An engine 15 suspended by the frame 11 and a rear wheel suspension system 18 having a rear wheel 17 extended rearward of the vehicle from the body frame 11 and located behind the engine 15 and driven by the engine 15 are main components. .

　ヘッドパイプ１２は、前輪操向装置１４を操向自在に支持する部材である。前輪操向装置１４は、前輪１３と、この前輪１３を回転自在に支えるフロントフォーク２１と、このフロントフォーク２１の上端に取付けられ運転者が握って操向するハンドル２２と、からなる。
　フロントフォーク２１にフロントカウル２４が取付けられ、このフロントカウル２４にヘッドライト２５が取付けられている。 The head pipe 12 is a member that supports the front wheel steering device 14 in a steerable manner. The front wheel steering device 14 comprises a front wheel 13, a front fork 21 rotatably supporting the front wheel 13, and a steering wheel 22 attached to an upper end of the front fork 21 and steered by a driver.
A front cowl 24 is attached to the front fork 21, and a headlight 25 is attached to the front cowl 24.

　後輪懸架装置１８は、車体フレーム１１から後方に延ばされ後輪１７を揺動自在に支持するスイングアーム２７と、このスイングアーム２７と車体フレーム１１の間に渡されるクッションユニット２８とからなる。 The rear wheel suspension system 18 comprises a swing arm 27 extended rearward from the vehicle body frame 11 and pivotally supporting the rear wheel 17 and a cushion unit 28 passed between the swing arm 27 and the vehicle body frame 11 .

　車体フレーム１１の構成要素であるメインフレーム３１の下方にエンジン１５が配置されている。このエンジン１５は、クランクケース３２及びこのクランクケース３２から斜め上へ延びるシリンダ３３を有する。シリンダ３３の後壁３４に、スロットルバルブ３７が接続され、このスロットルバルブ３７の後方にエアクリーナユニット３８が接続されている。シリンダ３３の前壁３５には、排気管４１が接続され、この排気管４１は車両後方へ向きを変えて延び、この排気管４１の後端に消音器４２が接続されている。 An engine 15 is disposed below the main frame 31 which is a component of the vehicle body frame 11. The engine 15 has a crankcase 32 and a cylinder 33 extending obliquely upward from the crankcase 32. A throttle valve 37 is connected to the rear wall 34 of the cylinder 33, and an air cleaner unit 38 is connected to the rear of the throttle valve 37. An exhaust pipe 41 is connected to the front wall 35 of the cylinder 33, and the exhaust pipe 41 turns in the rearward direction of the vehicle and extends. A silencer 42 is connected to a rear end of the exhaust pipe 41.

　ハンドル２２の車両後方に、燃料タンク４３が配置され、この燃料タンク４３の車両後方に連続するように乗員が座るシート４４が配置されている。燃料タンク４３及びシート４４は、いずれも車体フレーム１１によって支持されている。車両後部左側方位置で、リヤクッションユニット２８の後方に、車体フレーム１１からガード部材４５が垂下されている。４６はリヤフェンダである。 A fuel tank 43 is disposed rearward of the steering wheel 22 in the vehicle, and a seat 44 on which an occupant sits is disposed so as to be continuous with the fuel tank 43 rearward of the vehicle. The fuel tank 43 and the seat 44 are both supported by the vehicle body frame 11. A guard member 45 is suspended from the vehicle body frame 11 to the rear of the rear cushion unit 28 at a position on the rear side of the vehicle. 46 is a rear fender.

　次に、車体フレームの要部について説明する。
　図２に示されているように、ヘッドパイプ１２から車両後方へメインフレーム３１が延びている。車両側面視で、メインフレームの前部５１に、ヘッドパイプ後面下端５２から車両後方斜め上方へ延ばされシリンダの上面５５を迂回する迂回部５６が設けられている。 Next, the main part of the vehicle body frame will be described.
As shown in FIG. 2, a main frame 31 extends from the head pipe 12 to the rear of the vehicle. In a side view of the vehicle, a detour portion 56 is provided on the front portion 51 of the main frame, and extends from the lower end 52 of the rear surface of the head pipe obliquely upward to the rear of the vehicle to bypass the upper surface 55 of the cylinder.

　メインフレーム３１は、迂回部５６にヘッドパイプの後面上端５３よりも上方へ膨出する膨出部５７を備えている。この膨出部５７に燃料タンク４３を取付けるタンク取付部６１を設けた。 The main frame 31 is provided with a bulging portion 57 that bulges above the rear surface upper end 53 of the head pipe in the bypass portion 56. A tank mounting portion 61 for mounting the fuel tank 43 is provided at the bulging portion 57.

　燃料タンク４３は、メインフレーム３１を跨ぐように設けられ、燃料タンク４３の前部は、膨出部５７に取付けられ、燃料タンク４３の後部は、メインフレーム３１にブラケット６２を介して取付けられている。 The fuel tank 43 is provided to straddle the main frame 31, the front of the fuel tank 43 is attached to the bulging portion 57, and the rear of the fuel tank 43 is attached to the main frame 31 via the bracket 62. There is.

　この場合に、膨出部５７は迂回部５６に、ヘッドパイプの後面上端５３よりも上方へ膨出するように設けられている。
　仮に迂回部５６の後方に燃料タンク４３の前部を支持させるとすると、燃料タンク４３の車両前後方向長さが小さくなり、タンク容量に影響がでる。 In this case, the bulging portion 57 is provided at the detour portion 56 so as to bulge above the upper end 53 of the rear surface of the head pipe.
Assuming that the front portion of the fuel tank 43 is supported behind the bypass portion 56, the length of the fuel tank 43 in the longitudinal direction of the vehicle is reduced, which affects the tank capacity.

　この点、実施例の膨出部５７は、迂回部の前部６３に設けられているため、膨出部５７に燃料タンク４３の前部を支持させれば、燃料タンク４３の車両前後方向長さが大きくなり、タンク容量が容易に確保できる。 In this respect, since the bulging portion 57 of the embodiment is provided at the front portion 63 of the detour portion, if the bulging portion 57 supports the front portion of the fuel tank 43, the length of the fuel tank 43 in the vehicle longitudinal direction And the tank capacity can be easily secured.

　次に、車体フレームの要部を上方から見た構造について説明する。
　図３に示されているように、車幅方向中央前後に１本のメインフレーム３１が延ばされ、このメインフレーム３１の前部に迂回部５６が形成され、この迂回部５６に膨出部５７が接合され、この膨出部５７に燃料タンク４３の前部が締結部材６５により締結されている。膨出部５７は、上方すなわち図手前側に延びている。
　メインフレーム３１の後部に車幅方向に延びる板状のブラケット６２が取付けられ、このブラケット６２にタンクリヤ取付部６０が設けられ、これらのタンクリヤ取付部６０に、燃料タンク４３の後部が締結部材６５を介して締結されている。 Next, a structure in which the main part of the vehicle body frame is viewed from above will be described.
As shown in FIG. 3, one main frame 31 is extended around the center in the width direction of the vehicle, and a bypass portion 56 is formed at the front of the main frame 31. The front end of the fuel tank 43 is fastened to the bulging portion 57 by a fastening member 65. The bulging portion 57 extends upward, that is, toward the front side in the drawing.
A plate-like bracket 62 extending in the vehicle width direction is attached to the rear of the main frame 31, a tank rear attachment portion 60 is provided on the bracket 62, and the rear portion of the fuel tank 43 is attached to the fastening member 65 in these tank rear attachment portions 60. It is concluded through.

　図２を併せて参照して、膨出部５７は、ヘッドパイプ１２から空間６６を介して車両後方に配置されている。
　ヘッドパイプ１２の上方には操向ハンドル２２が配置される。この操向ハンドル２２と膨出部５７とが離されているため、操向ハンドル２２の形状自由度が増す。 Referring also to FIG. 2, the bulging portion 57 is disposed rearward of the head pipe 12 via the space 66.
A steering handle 22 is disposed above the head pipe 12. Since the steering handle 22 and the bulging portion 57 are separated, the shape freedom of the steering handle 22 is increased.

　図３に戻って、燃料タンク４３の後部締結位置４７の近傍から車両後方へシートレール６７が延ばされ、このシートレール６７の車幅方向左右にエアクリーナユニット３８が配置されている。エアクリーナユニット３８の車幅方向右側に、エアクリーナユニット３８のダーテイサイド７１が配置され、同じく、車幅方向左側に、エアクリーナユニット３８のクリーンサイド７２が配置され、このクリーンサイド７２から車両前方にコネクテイングチューブ７３が延ばされ、コネクテイングチューブ７３の前端にスロットルバルブ３７が接続されている。 Referring back to FIG. 3, the seat rail 67 extends from the vicinity of the rear fastening position 47 of the fuel tank 43 toward the rear of the vehicle, and the air cleaner unit 38 is disposed on the left and right sides of the seat rail 67 in the vehicle width direction. The dirty side 71 of the air cleaner unit 38 is disposed on the right side in the vehicle width direction of the air cleaner unit 38, and the clean side 72 of the air cleaner unit 38 is similarly disposed on the left side in the vehicle width direction. 73 is extended, and a throttle valve 37 is connected to the front end of the connecting tube 73.

　次に、自動二輪車に用いられている車体フレームの構成要素を説明する。
　図４に示されているように、車体フレーム１１は、ヘッドパイプ１２と、ヘッドパイプ１２の後面に接合されるメインフレーム３１と、メインフレーム３１の下部に接続されるダウンフレーム７６と、メインフレーム３１の後端に接合されるシートレール６７及びピボットフレーム７７と、シートレール６７及びピボットフレーム７７の間に渡されるサブフレーム７８と、を主要素とする。 Next, components of a vehicle body frame used in a motorcycle will be described.
As shown in FIG. 4, the vehicle body frame 11 includes a head pipe 12, a main frame 31 joined to the rear surface of the head pipe 12, a down frame 76 connected to the lower portion of the main frame 31, and a main frame A seat rail 67 and a pivot frame 77 joined to the rear end of 31 and a sub frame 78 passed between the seat rail 67 and the pivot frame 77 are main elements.

　本実施例では、メインフレーム３１は、ヘッドパイプ１２の車両後方に延ばされ迂回部５６を構成するガセット部材８１と、ガセット部材８１の車両後方に延ばされるセンタフレーム８２と、からなる。
　膨出部５７としての膨出部材５８は、ガセット部材の上面８３に取付けられ、膨出部材５８の後面とガセット部材の上面８３の間に補強部材８４が接合されている。 In the present embodiment, the main frame 31 is composed of a gusset member 81 extended to the vehicle rear of the head pipe 12 and constituting the detour 56 and a center frame 82 extended to the vehicle rear of the gusset member 81.
The bulging member 58 as the bulging portion 57 is attached to the upper surface 83 of the gusset member, and the reinforcing member 84 is joined between the rear surface of the bulging member 58 and the upper surface 83 of the gusset member.

　メインフレーム３１は、ガセット部材８１とセンタフレーム８２とからなる結合体としたので、各要素部品の形状が単純化される。結果、各部品の製造コストを低減させることができる。 Since the main frame 31 is a combination of the gusset member 81 and the center frame 82, the shape of each component part is simplified. As a result, the manufacturing cost of each part can be reduced.

　次に、車体フレームの構造について説明する。
　図５に示されているように、車体フレーム１１は、ヘッドパイプ１２とヘッドパイプ１２から延ばされるガセット部材８１とこのガセット部材８１の下端から車両斜め後ろ後方へ延ばされるダウンフレーム７６と、ガセット部材８１の後端から後方に延ばされるセンタフレーム８２と、このセンタフレーム８２の後端から車両後方へ略水平に延ばされるシートレール６７及び下方へ垂下するように延ばされるピボットフレーム７７と、シートレール６７の中間部とピボットフレーム７７の下部の間に渡されるサブフレーム７８とを主要素とする。 Next, the structure of the vehicle body frame will be described.
As shown in FIG. 5, the vehicle body frame 11 includes a head pipe 12 and a gusset member 81 extended from the head pipe 12, a down frame 76 extended obliquely backward from the lower end of the gusset member 81, and a gusset member A center frame 82 extending rearward from the rear end of the seat 81, a seat rail 67 extending substantially horizontally from the rear end of the center frame 82 to the rear of the vehicle, and a pivot frame 77 extending downwardly depending on the seat rail 67 And the sub frame 78 passed between the lower part of the pivot frame 77 as the main element.

　ヘッドパイプ１２から車両後方へメインフレーム３１が延ばされている。メインフレーム３１前部を構成するガセット部材８１の上面８３に、膨出部材５８が接合されている。すなわち、膨出部材５８は、メインフレームの上面８５に溶接により接合されている。膨出部材５８は、メインフレーム３１とは別個製作され、後に接合される。 A main frame 31 extends from the head pipe 12 to the rear of the vehicle. The bulging member 58 is joined to the upper surface 83 of the gusset member 81 constituting the front portion of the main frame 31. That is, the bulging member 58 is joined to the upper surface 85 of the main frame by welding. The bulging member 58 is manufactured separately from the main frame 31 and is later joined.

　製作段階では、メインフレーム３１は形状が簡易なものとなり、メインフレーム３１の製作が容易になる。膨出部材５８も同様に形状が簡単になり、膨出部材５８の製作が容易になる。
　なお、膨出部としての膨出部材５８は、ボルト締めによりメインフレームの上面８５に接合することは差し支えない。この場合に、モデルによっては膨出部材が不要になり、メインフレーム３１から随時膨出部材５８を外すことができる。 In the manufacturing stage, the main frame 31 has a simple shape, and the manufacturing of the main frame 31 is facilitated. The bulging member 58 is similarly simplified in shape, and the manufacture of the bulging member 58 is facilitated.
The bulging member 58 as the bulging portion may be joined to the upper surface 85 of the main frame by bolting. In this case, the bulging member may be unnecessary depending on the model, and the bulging member 58 can be removed from the main frame 31 as needed.

　図６に示されているように、メインフレーム３１、ダウンフレーム７６、ピボットフレーム７７及びシートレール６７は、いずれも車幅方向中心に車両前後に１本延びている。一方、サブフレーム７８Ｌ、７８Ｒは車幅方向左右に渡されている。 As shown in FIG. 6, each of the main frame 31, the down frame 76, the pivot frame 77, and the seat rail 67 extends in the longitudinal direction of the vehicle at the center in the vehicle width direction. On the other hand, the subframes 78L and 78R are passed laterally in the vehicle width direction.

　ガセット部材８１Ｌ、８１Ｒは、左右一対の板状部材であり、センタフレーム８２、ダウンフレーム７６は断面ロ字状を呈し、ピボットフレーム７７、シートレール６７及びサブフレーム７８は断面コ字状を呈する。 The gusset members 81L and 81R are a pair of left and right plate-like members, the center frame 82 and the down frame 76 have a rectangular cross section, and the pivot frame 77, the seat rail 67 and the sub frame 78 have a U shaped cross section.

　ダウンフレーム７６の下部には、エンジンへの締結部を構成する第１カラー部材９３が設けられ、ピボットフレーム７６の高さ方向中間部には、エンジンの後上部が締結されるエンジンブラケット９４が設けられ、ピボットフレーム７６の下端部には、エンジンの後下部が締結される第２カラー部材９５が設けられている。また、エンジンブラケット９４と第２カラー部材９５の間にてピボットフレーム７６には、サブフレーム７８Ｌ、７８Ｒが接合される第３カラー部材９６が設けられている。 A lower portion of the down frame 76 is provided with a first collar member 93 constituting a fastening portion to the engine, and an intermediate portion in the height direction of the pivot frame 76 is provided with an engine bracket 94 to which the rear upper portion of the engine is fastened. The lower end portion of the pivot frame 76 is provided with a second collar member 95 to which the rear lower portion of the engine is fastened. Further, the pivot frame 76 is provided with a third collar member 96 to which the sub frames 78L and 78R are joined between the engine bracket 94 and the second collar member 95.

　サブフレーム７８Ｌ、７８Ｒには、各々、クッションユニットの上端が取付けられる第４カラー部材９７Ｌ、９７Ｒが設けられている。さらに、シートレール６７の後端部に、車両後部を固定する第５カラー部材９８が設けられている。 The subframes 78L and 78R are respectively provided with fourth collar members 97L and 97R to which the upper ends of the cushion units are attached. Further, at the rear end of the seat rail 67, a fifth collar member 98 for fixing the rear of the vehicle is provided.

　以上に述べた自動二輪車の作用を次に述べる。
　図２に戻って、メインフレーム３１の前部に、ヘッドパイプ後面下端５２から車両後方斜め上方へ延ばされシリンダの上面５５を迂回する迂回部５６が設けられている。
　ヘッドパイプからメインフレームが延びる従来の構造では、エンジンの高さ方向寸法が大きい場合には、メインフレームを上げ、連動してヘッドパイプも上げる必要がでる。あるいは、ヘッドパイプを下げるには、エンジンの高さ寸法を小さくする必要がある。 The operation of the motorcycle described above will now be described.
Referring back to FIG. 2, a detour 56 is provided at the front of the main frame 31 and extends obliquely upward from the lower end 52 of the rear end of the head pipe to the rear of the vehicle to detour the upper surface 55 of the cylinder.
In the conventional structure in which the main frame extends from the head pipe, when the size in the height direction of the engine is large, the main frame needs to be raised and the head pipe also needs to be raised in conjunction. Alternatively, to lower the head pipe, it is necessary to reduce the height dimension of the engine.

　この点、実施例では、ヘッドパイプ１２からシリンダの上面５５を迂回する迂回部５６を介してメインフレーム３１を延ばした。すなわち、迂回部５６を採用したことにより、ヘッドパイプ１２を低位置に配置し、メインフレーム３１を高位置に配置することができる。メインフレーム３１が高位置にあれば、エンジン１５のメンテナンス性は高まる。
　ヘッドパイプ１２が低位置であれば、前輪１３を小径化する等の前輪操向装置１４のコンパクト化が図れる。 In this respect, in the embodiment, the main frame 31 is extended through the detour portion 56 which detours the upper surface 55 of the cylinder from the head pipe 12. That is, by adopting the detour portion 56, the head pipe 12 can be disposed at a low position, and the main frame 31 can be disposed at a high position. When the main frame 31 is in the high position, the maintainability of the engine 15 is enhanced.
If the head pipe 12 is at the low position, the front wheel steering device 14 can be made compact, for example, by reducing the diameter of the front wheel 13.

　メインフレーム３１は、迂回部５６にヘッドパイプ１２の後面上端５３よりも上方へ膨出する膨出部５７を備えている。
　迂回部５６は、車両前方ほど低位置になるため、メインフレーム３１の前部に車載部品を取付ける場合に取付が難しくなる。
　この点、実施例では、膨出部５７を設けたので、取付部位が高くなり車載部品の取付が容易になる。 The main frame 31 is provided with a bulging portion 57 that bulges above the rear surface upper end 53 of the head pipe 12 in the bypass portion 56.
The detour portion 56 is located at a lower position toward the front of the vehicle, which makes it difficult to attach the in-vehicle component to the front of the main frame 31.
In this respect, in the embodiment, since the bulging portion 57 is provided, the mounting site becomes high, and the mounting of the on-vehicle component becomes easy.

　実施例２を図面に基づいて説明する。
　図７に示されているように、車体フレーム１１は、ヘッドパイプ１２と、このヘッドパイプ１２から斜め後ろ上方へ延ばされ次いで斜め後下方へ延ばされているメインフレーム３１と、ヘッドパイプ１２の後面下端５２及びメインフレーム３１の下端に接合されているつなぎ部材８７と、このつなぎ部材８７の下端から車両斜め後ろ後方へ延ばされるダウンフレーム７６と、メインフレームの後端８８から車両後方へ延ばされるシートレール６７と、メインフレームの後端８８から下方へ垂下するように延ばされるピボットフレーム７７と、を主要素とする。 A second embodiment will be described based on the drawings.
As shown in FIG. 7, the vehicle body frame 11 includes a head pipe 12, a main frame 31 that extends diagonally rearward and upward from the head pipe 12, and then extends diagonally downward and backward, and the head pipe 12. Rear end lower end 52 and a lower end of the main frame 31 are connected to a connecting member 87, the lower end of the lower end of the connecting member 87 extends diagonally to the rear, and a rear end 88 of the main frame extends rearward A seat rail 67 and a pivot frame 77 extending downward from the rear end 88 of the main frame are main elements.

　実施例１と大きく異なる点は、メインフレーム３１は、ヘッドパイプ１２の車両後方に延ばされる断面円状のパイプフレーム８９であり、このパイプフレーム８９が、シートレール６７を含むように車両後部まで延ばされている点にある。 A major difference from the first embodiment is that the main frame 31 is a pipe frame 89 having a circular cross section and extending to the rear of the vehicle of the head pipe 12, and the pipe frame 89 extends to the rear of the vehicle so as to include the seat rail 67. It is the point being

　次に、メインフレーム前端の接合構造について説明する。
　図８に示されているように、メインフレームの前端８６にてヘッドパイプ１２との接続部９１は、高さ方向に断面形状を変化させると共にヘッドパイプ１２を車幅方向から挟むように取付けられている。 Next, the junction structure of the front end of the mainframe will be described.
As shown in FIG. 8, at the front end 86 of the main frame, the connecting portion 91 to the head pipe 12 is attached so as to change the sectional shape in the height direction and to sandwich the head pipe 12 in the vehicle width direction. ing.

　円断面をもつメインフレーム３１は、１本で形成され、その断面形状を変化させることで、ヘッドパイプ１２へ取付けることができる。従って、車体フレーム１１の要素数が減り、コストを低減することができる。 The main frame 31 having a circular cross section is formed by one, and can be attached to the head pipe 12 by changing the cross sectional shape. Therefore, the number of elements of the vehicle body frame 11 can be reduced, and the cost can be reduced.

　次に、メインフレーム後部の構造について説明する。
　図９に示されているように、シートレール６７は、断面が円形状から横長扁平形状に変形されている。
　パイプフレーム８９は、シートレール６７を含むように車両後部まで延ばされ、シートレール６７は、断面が円形状から横長扁平形状に変形されているので、シート受け、リヤフェンダ、トレイ、電装部品等の各要素部品が取付け易い。 Next, the structure of the rear of the main frame will be described.
As shown in FIG. 9, the seat rail 67 is deformed in cross section from a circular shape to a horizontally long flat shape.
The pipe frame 89 is extended to the rear of the vehicle so as to include the seat rail 67, and the seat rail 67 is deformed from a circular shape to a horizontally long flat shape in section, so that the sheet receiver, rear fender, tray, electric parts, etc. Each component part is easy to attach.

　尚、本発明は、実施の形態では自動二輪車に適用したが、三輪車にも適用可能であり、一般の車両に適用することは差し支えない。
　また、実施例によれば、迂回部から上方へ膨出する膨出部を省くことは差し支えない。 Although the present invention is applied to a two-wheeled motor vehicle in the embodiment, the present invention is also applicable to a three-wheeled vehicle, and may be applied to general vehicles.
Further, according to the embodiment, it is acceptable to omit the bulging portion that bulges upward from the bypass portion.

　実施例によれば、自動二輪車は、前輪を回転自在に支えるフロントフォークを操向可能に支持するヘッドパイプと、このヘッドパイプから車両後方へ延びるメインフレームと、このメインフレームの下方に配置されクランクケース及びこのクランクケースから斜め上へ延びるシリンダを有するエンジンと、車両側面視で、メインフレームの前部に設けられ、ヘッドパイプ後面下端から車両後方斜め上方へ延ばされシリンダの上面を迂回する迂回部と、を有してもよい。
　この構造によれば、メインフレームの前部に、ヘッドパイプ後面下端から車両後方斜め上方へ延ばされシリンダの上面を迂回する迂回部が設けられている。
　ヘッドパイプからメインフレームが延びる従来の構造では、エンジンの高さ方向寸法が大きい場合には、メインフレームを上げ、連動してヘッドパイプも上げる必要がでる。あるいは、ヘッドパイプを下げるには、エンジンの高さ寸法を小さくする必要がある。
　この点、この構造では、ヘッドパイプからシリンダ上面を迂回する迂回部を介してメインフレームを延ばした。すなわち、迂回部を採用したことにより、ヘッドパイプを低位置に配置し、メインフレームを高位置に配置することができる。メインフレームが高位置にあれば、エンジンのメンテナンス性は高まる。
　ヘッドパイプが低位置であれば、前輪を小径化する等の前輪操向装置のコンパクト化が図れる。 According to the embodiment, the motorcycle includes a head pipe rotatably supporting a front fork rotatably supporting a front wheel, a main frame extending rearward of the vehicle from the head pipe, and a crank disposed below the main frame An engine having a case and a cylinder extending obliquely upward from the crankcase, and a detour provided at the front of the main frame in a side view of the vehicle and extending diagonally upward from the lower end of the rear face of the head pipe to bypass the upper surface of the cylinder It may have a part.
According to this structure, the front portion of the main frame is provided with a detour that extends obliquely upward in the rear of the vehicle from the lower end of the rear surface of the head pipe and detours the upper surface of the cylinder.
In the conventional structure in which the main frame extends from the head pipe, when the size in the height direction of the engine is large, the main frame needs to be raised and the head pipe also needs to be raised in conjunction. Alternatively, to lower the head pipe, it is necessary to reduce the height dimension of the engine.
In this respect, in this structure, the main frame is extended from the head pipe via a detour portion which detours the cylinder upper surface. That is, by adopting the detour portion, the head pipe can be disposed at the low position, and the main frame can be disposed at the high position. When the mainframe is at a high position, the maintainability of the engine is enhanced.
If the head pipe is at a low position, the front wheel steering device can be made compact, for example, by reducing the diameter of the front wheel.

　また、実施例によれば、メインフレームは、迂回部の上方にヘッドパイプの後面上端よりも上方へ膨出する膨出部を備えてもよい。
　迂回部は、車両前方ほど低位置になるため、メインフレームの前部に車載部品を取付ける場合に取付が難しくなる。
　この点、この構造によれば、メインフレームは、迂回部の上方にヘッドパイプの後面上端よりも上方へ膨出する膨出部を設けたので、取付部位が高くなり車載部品の取付が容易になる。 Further, according to the embodiment, the main frame may be provided with a bulging portion which bulges above the rear surface upper end of the head pipe above the detouring portion.
The detour portion is located lower toward the front of the vehicle, which makes it difficult to mount the in-vehicle component on the front of the main frame.
In this respect, according to this structure, the main frame is provided with a bulging portion which bulges upward beyond the upper end of the rear surface of the head pipe above the detouring portion. Become.

　また、実施例によれば、メインフレームに燃料タンクを備え、膨出部に燃料タンクの前部を取付けるタンク取付部を設けてもよい。
　仮に迂回部の後方に燃料タンクの前部を支持させるとすると、燃料タンクの車両前後方向長さが小さくなり、タンク容量に影響がでる。
　この点、この構造によれば、膨出部は、迂回部の前部に設けられているため、膨出部に燃料タンクの前部を支持させれば、燃料タンクの車両前後方向長さが大きくなり、所定のタンク容量が容易に確保できる。 Further, according to the embodiment, the main frame may be provided with the fuel tank, and the bulging portion may be provided with a tank mounting portion for attaching the front portion of the fuel tank.
Assuming that the front portion of the fuel tank is supported behind the bypass portion, the length of the fuel tank in the longitudinal direction of the vehicle is reduced, which affects the tank volume.
In this respect, according to this structure, since the bulging portion is provided at the front of the detouring portion, if the front portion of the fuel tank is supported by the bulging portion, the length of the fuel tank in the vehicle longitudinal direction is It becomes large and a predetermined tank capacity can be easily secured.

　また、実施例によれば、膨出部は、ヘッドパイプから空間を介して車両後方に配置されてもよい。
　ヘッドパイプの上方には操向ハンドルが配置される。この構造によれば、この操向ハンドルと膨出部とが離されているため、操向ハンドルの形状自由度が増す。 Further, according to the embodiment, the bulging portion may be disposed rearward of the vehicle through the space from the head pipe.
A steering handle is disposed above the head pipe. According to this structure, since the steering handle and the bulging portion are separated, the degree of freedom in the shape of the steering handle is increased.

　また、実施例によれば、膨出部は、メインフレームの上面に溶接又はボルト締めにより接合されてもよい。
　この構造によれば、膨出部材は、メインフレームとは別個製作され、後に接合される。
　製作段階では、メインフレームは形状が簡易なものとなり、メインフレームの製作が容易になる。膨出部材も同様に形状が簡単になり、膨出部材の製作が容易になる。
　特に、ボルト接合の場合は、モデルによっては膨出部材が不要になり、メインフレームから随時膨出部材を外すことができる。 Further, according to the embodiment, the bulging portion may be joined to the upper surface of the main frame by welding or bolting.
According to this structure, the bulging member is manufactured separately from the main frame and is later joined.
At the stage of manufacture, the main frame has a simple shape, which facilitates the manufacture of the main frame. The bulging member also has a simple shape, and the bulging member can be easily manufactured.
In particular, in the case of bolt connection, depending on the model, the bulging member may be unnecessary, and the bulging member can be removed from the main frame as needed.

　また、実施例によれば、メインフレームは、ヘッドパイプの車両後方に延ばされるガセット部材と、ガセット部材の車両後方に延ばされるセンタフレームと、からなってもよく、ガセット部材は、その下面をシリンダの上方で後上がりに傾斜する迂回部を備えてもよく、膨出部は、ガセット部材の上面に取付けられてもよい。
　この構造によれば、メインフレームは、ガセット部材とセンタフレームとからなる結合体としたので、各要素部品の形状が単純化される。結果、各部品の製造コストを低減させることができる。 Further, according to the embodiment, the main frame may be composed of a gusset member extended to the vehicle rear of the head pipe and a center frame extended to the vehicle rearward of the gusset member, and the gusset member And the bulging portion may be attached to the upper surface of the gusset member.
According to this structure, since the main frame is a combination of the gusset member and the center frame, the shape of each component part is simplified. As a result, the manufacturing cost of each part can be reduced.

　また、実施例によれば、メインフレームは、ヘッドパイプの車両後方に延ばされる断面円状のパイプフレームでもよく、メインフレームの前端にてヘッドパイプとの接続部は、高さ方向に断面形状を変化させると共にヘッドパイプを車幅方向から挟むように取付けられてもよい。
　この構造によれば、円断面をもつメインフレームは、１本で形成され、その断面形状を変化させることで、ヘッドパイプへ取付けることができる。従って、車体フレームの要素数が減り、コストを低減することができる。 Further, according to the embodiment, the main frame may be a pipe frame having a circular cross section and extending toward the vehicle rear of the head pipe, and the connection portion with the head pipe at the front end of the main frame has a cross sectional shape in the height direction. It may be attached so as to sandwich the head pipe from the vehicle width direction while changing it.
According to this structure, the main frame having a circular cross section is formed by one piece, and can be attached to the head pipe by changing the cross sectional shape. Therefore, the number of elements of the vehicle body frame can be reduced and the cost can be reduced.

　また、実施例によれば、パイプフレームは、シートレールを含むように車両後部まで延ばされ、シートレールは、断面が円形状から横長扁平形状に変形されてもよい。
　この構造によれば、パイプフレームは、シートレールを含むように車両後部まで延ばされ、シートレール部は、断面が円形状から横長扁平形状に変形されているので、シート受け、リヤフェンダ、トレイ、電装部品等の各要素部品が取付け易い。 Further, according to the embodiment, the pipe frame may be extended to the rear of the vehicle so as to include the seat rail, and the seat rail may be deformed in cross section from a circular shape to a horizontally long flat shape.
According to this structure, the pipe frame is extended to the rear of the vehicle so as to include the seat rail, and the seat rail portion is deformed from a circular shape to a horizontally long flat shape in section, so the sheet receiver, rear fender, tray, It is easy to attach each component parts such as electric parts.

　本発明は、自動二輪車に好適である。 The present invention is suitable for a motorcycle.

　１０…自動二輪車、１２…ヘッドパイプ、１３…前輪、１５…エンジン、２１…フロントフォーク、３１…メインフレーム、３２…クランクケース、３３…シリンダ、４３…燃料タンク、５６…迂回部、５７…膨出部、６１…タンク取付部、６７…シートレール、８１…ガセット部材、８２…センタフレーム、８３…ガセット部材の上面 DESCRIPTION OF SYMBOLS 10 motorcycle, 12 head pipe, 13 front wheel, 15 front engine, 21 front fork, 31 main frame, 32 crankcase, 33 cylinder, 43 fuel tank, 56 bypass portion, 57 bulging Out part, 61: tank attachment part, 67: seat rail, 81: gusset member, 82: center frame, 83: upper surface of gusset member

Claims (8)

　前輪（１３）を回転自在に支えるフロントフォーク（２１）を操向可能に支持するヘッドパイプ（１２）と、
　このヘッドパイプ（１２）から車両後方へ延びるメインフレーム（３１）と、
　このメインフレーム（３１）の下方に配置されクランクケース（３２）及びこのクランクケース（３２）から斜め上へ延びるシリンダ（３３）を有するエンジン（１５）と、
　車両側面視で、前記メインフレーム（３１）の前部に設けられ、前記ヘッドパイプ（１２）後面下端から車両後方斜め上方へ延ばされ前記シリンダ（３３）の上面を迂回する迂回部（５６）と、
　を具備する、自動二輪車。 A head pipe (12) for steerably supporting a front fork (21) rotatably supporting the front wheel (13);
A main frame (31) extending from the head pipe (12) to the rear of the vehicle;
An engine (15) disposed under the main frame (31) and having a crankcase (32) and a cylinder (33) extending obliquely upward from the crankcase (32);
A detouring portion (56) provided at the front of the main frame (31) in a side view of the vehicle and extending obliquely rearward and upward from the lower end of the rear surface of the head pipe (12) to detour the upper surface of the cylinder (33) When,
Equipped with a motorcycle. 　前記メインフレーム（３１）に設けられ、前記迂回部（５６）の上方で前記ヘッドパイプ（１２）の後面上端よりも上方へ膨出する膨出部（５７）、
　を更に具備する、請求項１記載の自動二輪車。 A bulging portion (57) provided on the main frame (31), and bulging upward than the rear surface upper end of the head pipe (12) above the bypass portion (56);
The motorcycle according to claim 1, further comprising: 　燃料タンク（４３）と、
　前記膨出部（５７）に設けられ、前記燃料タンク（４３）の前部を取付けるタンク取付部（６１）と、
　を更に具備する、請求項２記載の自動二輪車。 With a fuel tank (43),
A tank mounting portion (61) provided at the bulging portion (57) and attaching a front portion of the fuel tank (43);
The motorcycle according to claim 2, further comprising 　前記膨出部（５７）は、前記ヘッドパイプ（１２）から空間を介して車両後方に配置されている、請求項２又は請求項３記載の自動二輪車。 The motorcycle according to claim 2 or 3, wherein the bulging portion (57) is disposed rearward of the vehicle via a space from the head pipe (12). 　前記膨出部（５７）は、前記メインフレーム（３１）の上面に溶接又はボルト締めにより接合されている、請求項２～４のいずれか１項記載の自動二輪車。 The motorcycle according to any one of claims 2 to 4, wherein the bulging portion (57) is joined to the upper surface of the main frame (31) by welding or bolting. 　前記メインフレーム（３１）は、前記ヘッドパイプ（１２）の車両後方に延ばされるガセット部材（８１）と、前記ガセット部材（８１）の車両後方に延ばされるセンタフレーム（８２）と、を有し、
　前記ガセット部材（８１）は、その下面を前記シリンダ（３３）の上方で後上がりに傾斜する前記迂回部（５６）、を有し、
　前記膨出部（５７）は、前記ガセット部材の上面（８３）に取付けられている、
　請求項２～５のいずれか１項記載の自動二輪車。 The main frame (31) has a gusset member (81) extended to the vehicle rear of the head pipe (12), and a center frame (82) extended to the vehicle rear of the gusset member (81);
The gusset member (81) has the detour portion (56) whose lower surface is inclined upward and rearward above the cylinder (33);
The bulging portion (57) is attached to the upper surface (83) of the gusset member,
A motorcycle according to any one of claims 2 to 5. 　前記メインフレーム（３１）は、前記ヘッドパイプ（１２）の車両後方に延ばされる断面円状のパイプフレーム（８９）からなり、
　前記メインフレーム（３１）の前端にて、前記ヘッドパイプ（１２）との接続部（９１）は、高さ方向に断面形状を変化させると共に前記ヘッドパイプ（１２）を車幅方向から挟むように取付けられている、
　請求項１～５のいずれか１項記載の自動二輪車。 The main frame (31) is composed of a pipe frame (89) having a circular cross section and extended to the rear of the vehicle of the head pipe (12).
At the front end of the main frame (31), the connection portion (91) with the head pipe (12) changes the sectional shape in the height direction and sandwiches the head pipe (12) in the vehicle width direction Installed,
A motorcycle according to any one of claims 1 to 5. 　前記パイプフレーム（８９）は、シートレール（６７）を含むように車両後部まで延ばされ、
　前記シートレール（６７）は、断面が円形状から横長扁平形状に変形されている、
　請求項７項記載の自動二輪車。 The pipe frame (89) is extended to the rear of the vehicle to include a seat rail (67),
The seat rail (67) is deformed in cross section from a circular shape to a horizontally long flat shape.
A motorcycle according to claim 7.
PCT/JP2011/074580 2010-10-27 2011-10-25 Automatic two-wheeled vehicle Ceased WO2012057159A1 (en)

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JP5442132B2 (en) 2014-03-12
CN103180201A (en) 2013-06-26

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