WO2013080959A1 - 車両のフレーム構造 - Google Patents
車両のフレーム構造 Download PDFInfo
- Publication number
- WO2013080959A1 WO2013080959A1 PCT/JP2012/080588 JP2012080588W WO2013080959A1 WO 2013080959 A1 WO2013080959 A1 WO 2013080959A1 JP 2012080588 W JP2012080588 W JP 2012080588W WO 2013080959 A1 WO2013080959 A1 WO 2013080959A1
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- WIPO (PCT)
- Prior art keywords
- bracket
- frame
- vehicle
- welded
- hole
- Prior art date
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Classifications
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- 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
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- 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
- B62K11/10—Frames characterised by the engine being over or beside driven rear wheel
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- 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
- B62K19/30—Frame parts shaped to receive other cycle parts or accessories
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- 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
- B62K2202/00—Motorised scooters
Definitions
- the present invention relates to the improvement of the frame structure of a vehicle.
- the rear of the motorcycle is provided with a cushion that absorbs the load acting on the rear wheels.
- a cushion that absorbs the load acting on the rear wheels.
- Various frame structures for supporting this cushion have been proposed (for example, Patent Document 1).
- the motorcycle disclosed in Patent Document 1 includes a cushion at the rear frame and the rear end of the rear fork.
- a bracket is further provided at an intermediate portion of the rear frame, and a bolt for cushion for supporting the rear cushion is provided on the bracket.
- a second cross bar extends between the left and right brackets, and the cushion bolt extends outward in the vehicle width direction from the brackets.
- the rigidity of the bracket is enhanced by extending the second cross bar near the cushioning bolt.
- the second cross bar which is a reinforcing member, is essential, resulting in an increase in the weight of the frame.
- bracket is simply thinned, the strength of the bracket is reduced, and therefore, it is necessary to improve the rigidity such as making the bracket thick. Thickening the bracket further increases the weight of the frame.
- Patent No. 3466383 gazette
- An object of the present invention is to provide a frame structure capable of reducing the weight of a frame in a vehicle provided with a bolt for cushioning on a rear frame.
- a vehicle frame structure comprising a pair of left and right rear frames, wherein a cushion is attached to each of the rear frames, wherein the frame structure comprises
- Each of the rear frames has a frame through hole penetrating in the vehicle width direction
- each of the brackets has a bracket through hole penetrating in the vehicle width direction.
- the axes of the through holes are welded to the respective rear frames so that the axes of the through holes coincide with the axes of the respective frame through holes, and the upper end of the cushion is attached to the rear frame in the frame through holes and the bracket through holes.
- a cushioning bolt for fastening is inserted, and the cushioning bolt is inserted into the rear frame. Not welded to the frame structure of a vehicle characterized in that it is welded to the bracket is provided.
- the bracket comprises a bracket main body to be brought into contact with the rear frame, and an upper extension which extends upward from the bracket main body and receives an on-vehicle component.
- the rear frame is formed with a flat surface extending vertically and longitudinally, and the flat surface is provided with a frame through hole and the bracket is welded to the flat surface.
- the bracket main body portion is welded to an outer flat surface of the rear frame in the vehicle width direction and contacts the outer flat surface from the outer abutment portion, and the outer abutment portion.
- An outer protrusion having an outer bracket through hole that protrudes outward, an inner abutment portion welded to the inner flat surface of the rear frame in the vehicle width direction and abutting on the inner flat surface, and an inner side from the inner abutment portion
- an inner convex portion provided with an inner bracket through hole, and the cushioning bolt is supported by the outer convex portion and the inner convex portion.
- the bracket is welded to the rear frame so that the frame through hole is provided in the rear frame, the bracket through hole is provided, and the axis of the bracket through hole coincides with the axis of the frame through hole.
- a cushioning bolt is passed through the through hole and the bracket through hole, and the cushioning bolt is welded to the bracket without being welded to the rear frame.
- the cushioning bolt Since the cushioning bolt is not welded to the rear frame but is welded to the bracket, the load acting on the cushioning bolt is first applied to the bracket. It then joins the rear frame via the bracket. That is, since the load acting on the cushioning bolt can be dispersed to the bracket and the rear frame, the load is changed from the concentrated load to the dispersed load.
- the load does not concentrate on the bracket and there is no need to reinforce the bracket and improve its rigidity, it is possible to make the bracket thinner and lighter.
- the load can be dispersed by the bracket and the load on the rear frame can be dispersed, as compared to the case where the cushion bolt is welded to the rear frame.
- the stress in the rear frame is reduced, and the thickness and weight of the rear frame can be reduced. Therefore, in the vehicle provided with the bolt for cushion in the rear frame, the weight of the frame can be reduced.
- the bracket comprises the bracket body portion and the upper extension portion extending upward from the bracket body portion and receiving the in-vehicle component.
- the bracket not only disperses the load but also serves as a support member for the in-vehicle component.
- the bracket can be used for two applications as compared to the case where the cushion bolt is welded to the rear frame and the rear frame is provided with the in-vehicle component bracket at a position apart from the cushion bolt. .
- the number of parts can be reduced and the cost can be reduced.
- a lightening hole is formed in the upper extending portion.
- the weight of the frame can be reduced by forming the lightening holes in the upper extension.
- the rear frame is formed with a flat surface extending vertically and vertically and the front and rear of the vehicle body, a frame through hole is provided on the flat surface, and the bracket is welded to the flat surface. Since the bracket is welded to the flat surface of the rear frame, the welding operation can be facilitated and the welding quality can be improved.
- the outer convex portion protrudes outward from the outer abutment portion abutting on the outer flat surface of the rear frame, and the inner convex portion inward from the inner abutment portion abutting on the inner flat surface.
- the cushioning bolt is supported by the outer and inner projections. Since the cushioning bolts are supported by the outer and inner projections, the supporting distance between the cushioning bolts is larger than in the case of supporting the cushioning bolts at the positions of the outer and inner abutments, The load applied to the cushion bolt can be supported firmly.
- the outer convex portion is protruded outward and the inner convex portion is protruded inward, it is possible to increase only the support distance of the cushion bolt without changing the width dimension of the rear frame, and the rear It is possible to suppress the increase in weight of the frame.
- the rigidity of the bracket is enhanced by the outer convex portion and the inner convex portion, even if a large load is applied to the upper wall of the bracket, the load can be supported. If the bracket is formed in a planar shape, the rigidity is likely to be reduced. However, in the present invention, since the bracket has an outer convex portion and an inner convex portion, the rigidity is increased and the bracket can be further thinned.
- FIG. 1 is a left side view of a vehicle according to the present invention. It is a perspective view of a vehicle body frame. It is the disassembled perspective view which disassembled the bracket from the rear frame. It is a temporary assembly figure of a bracket. It is a side view explaining the welding part between a rear frame and a bracket, and the welding part between a bracket and a bolt for cushions.
- FIG. 6 is a cross-sectional view taken along line 6-6 of FIG. 5;
- Front-back, left-right, and top-bottom used in the following description represent directions based on the occupant sitting on the seat.
- the scooter type vehicle 10 is provided with a front fork 13 which is steerably supported by a head pipe 12 of a vehicle body frame 11 (described in detail later) and a front provided rotatably at the lower end of the front fork 13.
- a front end is connected to a front wheel 15 attached to an axle 14, a steering wheel 16 connected to an upper end of a front fork 13 for a driver to grip and steer the front wheel 15, and a lower end of a main pipe 17 extending downward from the head pipe 12 to the rear of the vehicle body
- a lower frame 18L extending backward (L is an index indicating the left, the same applies hereinafter), and a rear frame 20L extending upward after the front end is connected to the cross pipe 19 coupled to the rear end of the lower frame 18L (described in detail later)
- an engine hanger link 31 connected to a lower end of the front end of the rear frame 20L so as to be pivotable at a pivot shaft 32.
- a power unit 34 which doubles as a swing arm and has a rear wheel 33 at its rear end, and a lower end attached to the rear end of the power unit 34 so that the upper end is supported at the rear of the rear frame 20L and absorbs load acting on the rear wheel 33 And a rear cushion 35L.
- the power unit 34 comprises an engine 36 swingably connected to the engine hanger link 31, and a transmission 37 integrated with the engine 36 to transmit power of the engine 36 to the rear wheel 33 and provided with a transmission mechanism.
- An intake system having an air cleaner 38 and a carburetor 39 and an exhaust system having an exhaust pipe 41 and a muffler 42 are connected to a cylinder head of the engine 36.
- a fuel tank 43 is disposed at the rear of the main pipe 17 in the vehicle body, and an upper part of the fuel tank 43 is disposed with an article such as a helmet and a storage box 44 as an on-vehicle component.
- the storage box 44 is supported by the rear end of the lower frame 18L and the rear of the rear frame 20L.
- the body frame 11 is covered with a body cover 45.
- the body cover 45 is provided adjacent to the front cover 46 covering the front of the body frame 11, the upper inner cover 47 covering the rear of the front cover 46, and the upper inner cover 47 to cover the upper side of the fuel tank 43.
- a lower inner cover 48, a rear cover 49 provided adjacent to the rear end of the lower inner cover 48 and covering the side of the rear of the rear frame 20L, and a fuel tank 43 provided below the front cover 46 and the rear cover 49
- a lower cover 52 which is provided adjacent to the front cover 46 and the middle cover 51 and covers the lower part and the side of the lower part of the vehicle body frame 11.
- a refueling lid 53 is provided on the upper portion of the lower inner cover 48 so that the refueling cap of the fuel tank 43 can be attached and detached.
- a maintenance lid 54 used at the time of maintenance is provided so as to be able to open and close.
- a seat 55 on which the driver and the passenger sit can be disposed so as to cover the storage box 44.
- a step 56 where the driver places the foot is disposed.
- a pillion step 57 on which the passenger places his / her foot is attached to the rear of the vehicle body in step 56, and a grab rail 58 gripped by the passenger is provided so as to surround the rear of the seat 55.
- the vehicle body frame 11 includes a head pipe 12, a hollow main pipe 17 extending downward from the head pipe 12 to the rear of the vehicle body and an upper end portion thereof reinforced by a reinforcing member 59, and the main pipe
- a lower portion 61 of the front end portion 62L, a front end portion 62L (where R is a suffix indicating the right, the same applies hereinafter) is coupled, and a pair of left and right lower frames 18L, R extending backward from the lower portion 61 and a rear end portion 63L
- the cross pipe 19 connected to the rear end 63R of the lower frame 18R and extending in the vehicle width direction, and the front end 64L, R at each of the rear ends 63L, R of the lower frames 18L, R and the end of the cross pipe 19
- the front end (FIG. 1, reference numerals 67L, R) of the storage box (FIG. 1, reference numeral 44) is supported separately from the cross pipe 19 at the rear end 63L of the lower frame 18L and the rear end 63R of the lower frame 18R.
- a U-shaped storage box support member 68 is coupled.
- Fastening seats 69L, R for fastening the storage box are provided at the upper left end and the right end of the storage box support member 68.
- storage box intermediate stays 71L, R for supporting the middle in the front-rear direction of the storage box are provided on the front inner surface of the rear frames 20L, R, and cushions are provided on the upper surfaces of the storage box intermediate stays 71L, R. Rubbers 72L and R are provided.
- a bracket 80L (described in detail later) that supports the rear portion (FIG. 1, reference numeral 74L) of the storage box and the rear cushion (FIG. 1, reference numeral 35L) is coupled to the rear portion 73L of the rear frame 20L.
- a bracket 80R that supports the rear portion (FIG. 1, reference numeral 74R) of the storage box and the rear cushion (FIG. 1, reference numeral 35R) is coupled to the rear portion 73R of the rear frame 20R. That is, the storage box is supported by the storage box support member 68, the storage box intermediate stays 71L, R, and the brackets 80L, R.
- An intermediate cross member 81 extending in the vehicle width direction is coupled to a longitudinal middle portion of the rear frame 20L and a longitudinal middle portion of the rear frame 20R.
- the rear frame 20L is a hollow member.
- an outer flat surface 82 which extends vertically and horizontally and has a certain height H1 is formed.
- the outer flat surface 82 is provided with a frame-side outer through hole 83 penetrating in the vehicle width direction.
- an inner flat surface 84 which extends vertically and longitudinally and has a certain height H2 is formed.
- the inner flat surface 84 is provided with a frame side inner through hole 85 penetrating in the vehicle width direction.
- the bracket 80L includes a bracket main body 90L to be brought into contact with the rear frame 20L, and an upper extension 100L extending upward from the bracket main body 90L and receiving a storage box (FIG. 1, reference numeral 44).
- the bracket body portion 90L is provided at the lower portion in the vehicle width direction of the upper extension portion 100L and is in contact with the outer flat surface 82, and the bracket through hole 93 is projected outward from the outer contact portion 91. And an inner contact portion 94 provided on an inner lower portion of the upper extension 100L in the vehicle width direction and in contact with the inner flat surface 84; and a bracket through hole 96 projecting inward from the inner contact portion 94. And an inner protrusion 95.
- the upper extension 100L is provided continuously with the outer contact portion 91 and extends vertically, the inner wall 102 continuously provided with the inner contact portion 94 and extends vertically, and behind the outer wall 101 It comprises a rear wall 103 provided continuously to the end and the rear end of the inner side wall 102 and extending vertically, and an upper wall 104 provided continuously to the outer side wall 101, the inner side wall 102 and the rear wall 103 and extending to the front and rear of the vehicle body .
- the upper wall 104 is provided with a cushion rubber 105 for receiving the rear portion (FIG. 1, reference numeral 74R) of the storage box (FIG. 1, reference numeral 44).
- the rear end portion of the bracket 80L is provided with a recess 106 formed by cutting the rear end portion of the bracket main body 90L.
- the cushioning bolt 120L extends in the vehicle width direction and is inserted into the bracket side outer through hole 93 of the bracket main body 90L, the frame side outer through hole 83 of the rear frame 20L, the frame side inner through hole 85, and the bracket side inner through hole 96 And a screw portion 122 extended from the shaft portion 121 inward in the vehicle width direction to support the upper end of the rear cushion (35L in FIG. 1).
- bracket 80L To temporarily assemble the bracket 80L to the rear portion 73L of the rear frame 20L, the bracket 80L is fitted to the rear portion 73L, and the cushion bolt 120L is passed through the frame through holes 83 and 85 and the bracket through holes 93 and 96.
- FIG. 4 A state in which the bracket 80L is temporarily assembled to the rear portion 73L of the rear frame 20L will be described based on FIG. As shown in FIG. 4, a bracket 80L is temporarily assembled on the rear portion 73L of the rear frame 20L. After temporarily assembling the bracket 80L, fillet welding is performed on the outer flat surface 82, the front lower end 108, the rear lower end 109, and the rear end 111, and the fillet welding is performed on the outer projection 92 and the outer peripheral surface 123 of the shaft 121. Will be given.
- the outer flat surface 82 and the front lower end 108 are subjected to fillet welding to form an outer front weld 124.
- a fillet weld is applied to the outer flat surface 82, the rear lower end 109, and the rear end 111 to form an outer rear weld 125. That is, the bracket 80L is welded to the outer flat surface 82.
- fillet welding is performed on the outer convex portion 92 and the outer peripheral surface 123 of the shaft portion 121 to form the outer peripheral welded portion 126.
- the bracket 80L welded to the rear frame 20L will be described based on FIG.
- the bracket 80L has a bracket side outer through hole 93 and a bracket side inner through hole 96, and the axes of the bracket through holes 93, 96 (FIG. 3, reference numerals 127, 128) are outside the frame side. It is welded to the rear frame 20L so as to coincide with the axes (reference numerals 129, 131 in FIG. 3) of the through holes 83 and the frame side inner through holes 85.
- the weld portion is an outer rear weld portion 125 obtained by welding the outer contact portion 91 to the outer flat surface 82, and an inner rear weld portion 132 obtained by welding the inner contact portion 94 to the inner flat surface 84.
- the cushioning bolt 120L is not welded to the rear frame 20L, but is welded to the bracket 80L.
- the welds refer to the outer circumferential weld 126 and the inner circumferential weld 133.
- the cushion bolt 120L is supported by the outer protrusion 92 and the inner protrusion 95.
- the upper end 134L of the rear cushion 35L is fastened by the nut 135 to the screw portion 122 of the cushion bolt 120L, whereby the rear cushion is supported by the rear frame 20L.
- An outer thinning hole 112 is formed in the outer wall 101 of the upper extension portion 100L.
- the rear wall 103 is formed with a rear thinning hole 113.
- the inner side through hole 114 is formed in the inner side wall 102.
- bracket through holes 83 and 85 are provided in rear frame 20L
- bracket through holes 93 and 96 are provided
- the axes of bracket through holes 93 and 96 coincide with the axes of frame through holes 83 and 85.
- the bracket 80L is welded to the rear frame 20L so that the cushion bolt 120L is passed through the frame through holes 83 and 85 and the bracket through holes 93 and 96, and the cushion bolt 120L is not welded to the rear frame 20L, It is welded to the bracket 80L.
- the cushioning bolt 120L Since the cushioning bolt 120L is not welded to the rear frame 20L but is welded to the bracket 80L, a load acting on the cushioning bolt 120L is first applied to the bracket 80L. Thereafter, it is added to the rear frame 20L via the bracket 80L. That is, since the load acting on the cushioning bolt 120L can be dispersed to the bracket 80L and the rear frame 20L, the load is changed from the concentrated load to the dispersed load.
- the load can be dispersed by the bracket 80L and the load on the rear frame 20L can be dispersed as compared to the case where the cushion bolt 120L is welded to the rear frame 20L.
- the stress in the rear frame 20L is reduced, and the thickness and weight of the rear frame 20L can be reduced.
- the thickness of the rear frame 20L is 2.0 to 3.0 mm, but it is possible to make the thickness 1.0 to 2.0 mm by reducing the stress generated on the rear frame 20L. . Therefore, in the vehicle provided with the bolt for cushion in the rear frame, the weight of the frame can be reduced.
- the diameter D1 of the frame through holes 83, 85 is set larger than the outer diameter D2 of the cushioning bolt 120L. That is, the diameter D1 of the frame through holes 83 and 85 can be made large without being affected by the cushion bolt 120L. If the frame through holes 83 and 85 have a sufficiently large diameter, the cushion bolt 120L can be positioned at a predetermined position even if the positions of the frame through holes 83 and 85 deviate in the manufacturing stage.
- the bracket 80L includes a bracket body 90L and an upper extension 100L extending upward from the bracket body 90L and receiving an on-vehicle component (for example, a storage box) 44.
- the bracket 80 ⁇ / b> L serves as a support member for the in-vehicle component 44 in addition to dispersing the load.
- the bracket 80L has two uses as compared to the case where the cushion bolt 120L is welded to the rear frame 20L and the rear frame 20L is provided with the in-vehicle component bracket at a position apart from the cushion bolt 120L. It can be used for The number of parts can be reduced and the cost can be reduced.
- the storage box 44 is applied as an on-vehicle component in the embodiment, in a vehicle not provided with the storage box, a seat may be applied to receive the seat by the upper extension portion 100L.
- lightening holes 112, 113, 114 are formed in the upper extension portion 100L.
- the weight of the frame can be reduced.
- flat surfaces 82 and 84 extending up and down and to the front and rear of the vehicle body are formed on rear frame 20L, frame through holes 83 and 85 are provided on flat surfaces 82 and 84 and brackets on flat surfaces 82 and 84.
- 80 liters are welded.
- the bracket 80L is welded to the flat surface 82 of the rear frame 20L, the welding operation can be facilitated, and the welding quality can be improved.
- the outer protrusion 92 protrudes outward from the outer contact portion 91 that contacts the outer flat surface 82 of the rear frame 20L, and the inner protrusion 94 contacts the inner flat surface 84.
- the inner convex portion 95 is protruded, and the cushioning bolt 120 L is supported by the outer convex portion 92 and the inner convex portion 95.
- the cushion bolt is supported compared to the case where the cushion bolt 120L is supported at the positions of the outer abutment portion 91 and the inner abutment portion 94.
- the dimension W2 increases, and the load applied to the cushioning bolt can be firmly supported.
- the rigidity of the bracket 80L is increased by the outer convex portion 92 and the inner convex portion 95, even if a large load from the on-vehicle component 44 is applied to the upper wall 104 of the bracket 80L, the load can be supported. Temporarily, if the bracket is formed flat, the rigidity is likely to be reduced, but in the present invention, since the bracket 80L has the outer convex portion 92 and the inner convex portion 95, the rigidity is increased and the bracket can be further thinned. Become.
- the rear frame 20L is formed in an oval shape in a cross-sectional view, but may be formed in a rectangular shape or a square shape. If it is a rectangle or a square, a flat surface can be secured and welding quality can be improved.
- the frame structure according to the present invention is applied to the scooter type vehicle in the embodiment, it can be applied to any vehicle having a cushion attached to the rear frame, and is applicable to motorcycles and tricycles other than scooter type vehicles. No problem.
- the frame structure of the present invention is suitable for a vehicle having a cushion attached to the rear frame.
- SYMBOLS 10 ... Vehicle (Scoota type vehicle), 20L, 20R ... Rear frame, 35L, 35R ... Cushion (rear cushion), 44 ... Vehicle-mounted parts (storage box), 80L, 80R ... Bracket, 82, 84 ... Flat surface, 83, 85 frame through hole 90L, 90R bracket main body 91 outer contact portion 92 outer convex portion 93, 96 bracket through hole 94 inner contact portion 95 inner convex portion 100 L 100R ... Top extension part, 112, 113, 114 ... Thin hole, 120L, 120R ... Bolt for cushion, 127, 128, 129, 131 ... Axis, 134L, 134R ... Upper end.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Axle Suspensions And Sidecars For Cycles (AREA)
- Body Structure For Vehicles (AREA)
- Automatic Cycles, And Cycles In General (AREA)
- Motorcycle And Bicycle Frame (AREA)
Abstract
Description
ブラケットを厚肉にすると、フレームの重量が更に増加する。
そこで、第2クロスバーが不要であり、且つブラケットを薄肉にできるフレーム構造が求められる。
加えて、クッション用ボルトがリアフレームに溶接されている場合に比較して、本発明によれば、ブラケットにより荷重が分散され、リアフレームへの負荷を分散させることができる。リアフレームでの応力が小さくなり、リアフレームの薄肉化及び軽量化が可能となる。したがって、リアフレームにクッション用ボルトを備える車両において、フレームの軽量化を図ることができる。
ブラケットは、荷重を分散化させる他、車載部品の支持部材を兼ねる。リアフレームにクッション用ボルトを溶接し、このクッション用ボルトと離れた位置にてリアフレームに車載部品ブラケットを設ける場合に比較して、本発明によれば、ブラケットを2つの用途に用いることができる。部品点数を削減でき、コストを抑制することができる。
上部延出部に肉抜き孔を形成することにより、フレーム重量を軽量化することができる。
ブラケットをリアフレームの平坦面に溶接するため、溶接作業がしやすくなり、溶接品質を向上させることができる。
外側凸部と内側凸部でクッション用ボルトを支持するため、外側当接部及び内側当接部の位置でクッション用ボルトを支持する場合に比べて、クッション用ボルトの支持間寸法が大きくなり、クッション用ボルトに掛かる荷重をしっかりと支えることができる。
図1に示すように、スクータ型車両10は、車体フレーム11(詳細後述)のヘッドパイプ12に操向可能に支持されるフロントフォーク13と、このフロントフォーク13の下端に回転自在に設けた前車軸14に取付けられる前輪15と、フロントフォーク13の上端に連結され運転者が握って前輪15を操舵するハンドル16と、ヘッドパイプ12から車体後下方へ延びるメインパイプ17の下端に前端が結合され後方へ延びるロアフレーム18L(Lは左を示す添え字。以下同様。)と、このロアフレーム18Lの後端に結合したクロスパイプ19に前端が結合され後上方へ延びるリアフレーム20L(詳細後述)と、このリアフレーム20Lの前端下部に連結されたエンジンハンガーリンク31にピボット軸32で揺動可能に止められスイングアームを兼ねると共に後端に後輪33を備えるパワーユニット34と、このパワーユニット34の後端に下端が取付けられリアフレーム20Lの後部で上端が支持されると共に後輪33に作用する荷重を吸収するリアクッション35Lとを有する。
エンジン36のシリンダヘッドには、エアクリーナ38及びキャブレター39を有する吸気系と、排気管41及びマフラー42を有する排気系とが接続される。
さらに、ステップ56の車体後方には、同乗者が足を置くピリオンステップ57が取付けられ、シート55の後部を取り囲むようにして、同乗者が握るグラブレール58が設けられる。
図2に示すように、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から車体後下方に延ばされ上端部が補強部材59で補強される中空状のメインパイプ17と、このメインパイプ17の下部61に前端部62L、R(Rは右を示す添え字。以下同様)が結合され下部61から各々後方へ延びる一対の左右ロアフレーム18L、Rと、ロアフレーム18Lの後端部63Lとロアフレーム18Rの後端部63Rに結合され車幅方向へ延びるクロスパイプ19と、前端部64L、Rがロアフレーム18L、Rの後端部63L、Rの各々に且つクロスパイプ19の端部65L、Rに結合され後上方へ延びる一対の左右リアフレーム20L、Rと、リアフレーム20Lの後端とリアフレーム20Rの後端に結合され車幅方向へ延びる後部クロスメンバー66とからなる。
加えて、リアフレーム20L、Rの前部内側面の各々に、収納ボックスの前後方向中間を支持する収納ボックス中間ステー71L、Rが設けられ、これら収納ボックス中間ステー71L、Rの各上面に、クッションラバー72L、Rが設けられる。
図3に示すように、リアフレーム20Lは、中空状の部材である。このようなリアフレーム20Lの後部73Lの車幅方向外側に、上下及び車体前後へ延びると共に一定の高さH1を有する外側平坦面82が形成される。この外側平坦面82に、車幅方向へ貫通するフレーム側外貫通穴83が設けられる。
ブラケット80Lは、リアフレーム20Lに当てるブラケット本体部90Lと、このブラケット本体部90Lから上方へ延びて収納ボックス(図1、符号44)を受ける上部延出部100Lとからなる。
クッション用ボルト120Lは、車幅方向へ延びてブラケット本体部90Lのブラケット側外貫通穴93、リアフレーム20Lのフレーム側外貫通穴83、フレーム側内貫通穴85、ブラケット側内貫通穴96に挿入される軸部121と、この軸部121から車幅方向内側へ延ばされリアクッション(図1、符号35L)の上端を支持するねじ部122とからなる。
図4に示すように、ブラケット80Lがリアフレーム20Lの後部73Lに仮組みされている。ブラケット80Lを仮組みした後、外側平坦面82と前部下端108、後部下端109、後端111とにすみ肉溶接を施し、外側凸部92と軸部121の外周面123とにすみ肉溶接を施すことになる。
図5に示すように、外側平坦面82と前部下端108とにすみ肉溶接を施して、外側前溶接部124が形成される。加えて、外側平坦面82と後部下端109、後端111とにすみ肉溶接を施して、外側後溶接部125が形成される。すなわち、外側平坦面82にブラケット80Lが溶接される。
図6に示すように、ブラケット80Lは、ブラケット側外貫通穴93及びブラケット側内貫通穴96を有し且つこのブラケット貫通穴93、96の軸(図3、符号127、128)がフレーム側外貫通穴83及びフレーム側内貫通穴85の軸(図3、符号129、131)に一致するようにしてリアフレーム20Lに溶接される。この溶接部とは、外側平坦面82に外側当接部91を溶接して得られる外側後溶接部125、内側平坦面84に内側当接部94を溶接して得られる内側後溶接部132等を指す。
上部延出部100Lの外側壁101に、外側肉抜き穴112が形成されている。加えて、後壁103に、後肉抜き穴113が形成される。さらに、内側壁102に、内側肉抜き穴114が形成される。
図6に示す構成により、リアフレーム20Lにフレーム貫通穴83、85が設けられ、ブラケット貫通穴93、96を有し且つブラケット貫通穴93、96の軸がフレーム貫通穴83、85の軸に一致するようにブラケット80Lがリアフレーム20Lに溶接され、フレーム貫通穴83、85及びブラケット貫通穴93、96にクッション用ボルト120Lが通され、クッション用ボルト120Lは、リアフレーム20Lには溶接されないで、ブラケット80Lに溶接される。
加えて、クッション用ボルト120Lがリアフレーム20Lに溶接されている場合に比較して、本発明によれば、ブラケット80Lにより荷重が分散され、リアフレーム20Lへの負荷を分散させることができる。リアフレーム20Lでの応力が小さくなり、リアフレーム20Lの薄肉化及び軽量化が可能となる。通常、リアフレーム20Lの肉厚は2.0~3.0mmであるが、リアフレーム20Lに生じる応力が低減されることにより、肉厚を1.0~2.0mmにすることが可能となる。したがって、リアフレームにクッション用ボルトを備える車両において、フレームの軽量化を図ることができる。
ブラケット80Lは、荷重を分散化させる他、車載部品44の支持部材を兼ねる。リアフレーム20Lにクッション用ボルト120Lを溶接し、このクッション用ボルト120Lと離れた位置にてリアフレーム20Lに車載部品ブラケットを設ける場合に比較して、本発明によれば、ブラケット80Lを2つの用途に用いることができる。部品点数を削減でき、コストを抑制することができる。なお、車載部品として、実施例では収納ボックス44を適用したが、収納ボックスを備えない車両では、シートを適用してシートを上部延出部100Lで受けるようにしてもよい。
上部延出部100Lに肉抜き孔112、113、114を形成することにより、フレーム重量を軽量化することができる。
図5に示すように、ブラケット80Lをリアフレーム20Lの平坦面82に溶接するため、溶接作業がしやすくなり、溶接品質を向上させることができる。
外側凸部92と内側凸部95でクッション用ボルト120Lを支持するため、外側当接部91及び内側当接部94の位置でクッション用ボルト120Lを支持する場合に比べて、クッション用ボルトの支持間寸法W2が大きくなり、クッション用ボルトに掛かる荷重をしっかりと支えることができる。
Claims (5)
- 一対の左右リアフレームを含み、これらのリアフレームの各々にクッションが取付けられた、車両のフレーム構造において、
前記フレーム構造は、前記リアフレームの各々に設けられたブラケットを更に含み、
前記リアフレームの各々は、車幅方向へ貫通するフレーム貫通穴を有し、
前記ブラケットは、それぞれ車幅方向へ貫通するブラケット貫通穴を有するとともに、前記ブラケット貫通穴の軸がそれぞれの前記フレーム貫通穴の軸に一致するようにしてそれぞれの前記リアフレームに溶接されており、
前記フレーム貫通穴及び前記ブラケット貫通穴に、前記クッションの上端を前記リアフレームへ締結するためのクッション用ボルトが挿通され、
前記クッション用ボルトは、前記リアフレームには溶接されず、前記ブラケットに溶接されることを特徴とする車両のフレーム構造。 - 前記ブラケットは、前記リアフレームに当てるブラケット本体部と、このブラケット本体部から上方へ延びて車載部品を受ける上部延出部と、からなる請求項1記載の車両のフレーム構造。
- 前記上部延出部は、肉抜き穴が形成されている請求項2記載の車両のフレーム構造。
- 前記リアフレームは、車体上下及び前後方向へ延びる平坦面を有し、前記フレーム貫通穴は前記平坦面に設けられ、前記ブラケットは前記平坦面に溶接される、請求項1~3のいずれか1項記載の車両のフレーム構造。
- 前記ブラケット本体部は、前記リアフレームの車幅方向外側平坦面に溶接されて前記外側平坦面に当接する外側当接部と、前記外側当接部から外側へ突出して外側の前記ブラケット貫通穴を備える外側凸と、前記リアフレームの車幅方向内側平坦面に溶接されて前記内側平坦面に当接する内側当接部と、前記内側当接部から内側へ突出して内側のブラケット貫通穴を備える内側凸部と、からなり、前記外側凸部と前記内側凸部で前記クッション用ボルトを支持する、請求項4記載の車両のフレーム構造。
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