WO2021220483A1 - スイングアーム構造 - Google Patents

スイングアーム構造 Download PDF

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Publication number
WO2021220483A1
WO2021220483A1 PCT/JP2020/018312 JP2020018312W WO2021220483A1 WO 2021220483 A1 WO2021220483 A1 WO 2021220483A1 JP 2020018312 W JP2020018312 W JP 2020018312W WO 2021220483 A1 WO2021220483 A1 WO 2021220483A1
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WO
WIPO (PCT)
Prior art keywords
arm
end side
swing arm
cross member
pair
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/JP2020/018312
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English (en)
French (fr)
Japanese (ja)
Inventor
真之 平丸
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 PCT/JP2020/018312 priority Critical patent/WO2021220483A1/ja
Priority to JP2022518556A priority patent/JP7303942B2/ja
Publication of WO2021220483A1 publication Critical patent/WO2021220483A1/ja
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 SIDECARS, FORECARS, OR THE LIKE
    • B62K25/00—Axle suspensions
    • B62K25/04—Axle suspensions for mounting axles resiliently on cycle frame or fork
    • B62K25/12—Axle suspensions for mounting axles resiliently on cycle frame or fork with rocking arm pivoted on each fork leg
    • B62K25/14—Axle suspensions for mounting axles resiliently on cycle frame or fork with rocking arm pivoted on each fork leg with single arm on each fork leg
    • B62K25/20—Axle suspensions for mounting axles resiliently on cycle frame or fork with rocking arm pivoted on each fork leg with single arm on each fork leg for rear wheel

Definitions

  • the present invention relates to a swing arm structure.
  • a swing arm that supports the rear wheels includes an arm body formed by bending a square pipe having a rectangular cross section into a U shape, and a hollow cross member divided into upper and lower parts. (See, for example, Patent Document 1).
  • the swing arm which is the spring element of the suspension, is required to reduce the weight while maintaining the rigidity.
  • the weight it is conceivable to adopt a cast part having a high degree of molding freedom for the swing arm to reduce the wall thickness, but there is a problem that the cost increases.
  • a swing arm is formed by combining a plurality of pipe materials in order to suppress an increase in cost, there is a problem that the weight increases.
  • the present invention provides a swing arm structure capable of reducing weight while suppressing an increase in cost.
  • a first aspect of the present invention is the structure of a swing arm (11) in which one end side is pivotally supported on the vehicle body side so as to swing up and down and the wheel (12) is pivotally supported on the other end side.
  • 11) is a pivot portion (31) located on one end side and supported by the swing shaft, and a pair of left and right arm portions (32L) extending from the pivot portion (31) to the wheel shaft support position toward the other end side. , 32R) and a cross member portion (33) located on the other end side of the pivot portion (31) and connecting the pair of left and right arm portions (32L, 32R) to each other.
  • the arm portions (32L, 32R) of the above are divided into one end side arm portion (41) and the other end side arm portion (51), respectively, and the one end side arm portion (41) is combined with the upper arm portion (42).
  • the lower arm portion (43), and the other end side arm portion (51) is composed of a pipe material provided so as to be connected to the one end side arm portion (41), and the cross member portion (
  • the 33) is divided into an upper cross member portion (37) and a lower cross member portion (38) to be combined with each other, and the upper cross member portion (37) and the upper arm portion (42) are integrally formed with each other.
  • the upper split body (47) is formed, and the lower cross member portion (38) and the lower arm portion (43) are integrally formed with each other to form the lower split body (48).
  • the one end side arm portion and the cross member portion of the swing arm can be configured as an upper and lower split body separate from the other end side arm portion.
  • the upper and lower divided bodies can be press-molded products obtained by pressing plate members (metal plates) such as steel plates, respectively, and can have a Monaca structure in which these open ends are joined to each other.
  • pressing plate members metal plates
  • Monaca structure in which these open ends are joined to each other.
  • the wall thickness of the plate member forming the upper and lower divided bodies is reduced while suppressing the length of the pipe material and maintaining the strength and rigidity. It is possible to reduce the weight and cost.
  • the end portion (51f) on the one end side of the other end side arm portion (51) is more than the end portion (P3) on the one end side of the cross member portion (33). It is located on the other end side.
  • the position of the end portion of the other end side arm portion made of the pipe material on the one end side is limited to the other end side of the end portion on the one end side of the cross member portion, thereby limiting the position of the pipe material to the other end side.
  • the length can be reduced to reduce the weight.
  • the strength and rigidity required for the other end side arm portion can be suppressed, and weight reduction and cost reduction can be achieved by reducing the wall thickness.
  • a third aspect of the present invention is formed inside the pair of left and right arm portions (51) on the other end side in the vehicle width direction so as to be separated from each other toward the other end side in a plan view of the swing arm (11).
  • the other end side edge portion (36) provided on the other end side of the cross member portion (33) is provided with the inner edge portion (51c1), which is outside in the vehicle width direction in the plan view of the swing arm (11).
  • the pair of left and right other end outer portions (36a) are provided so as to be located on the other end side, and the left and right pair of other end outer portions (36a) are the left and right pair of other end side arm portions (51). ) Are joined to each inner edge (51c1).
  • the inner edge portion of the other end side arm portion and the other end outer portion of the cross member portion form a swing arm. It is joined so that it is connected as smoothly as possible in the plan view of. Thereby, the stress concentration at the joint can be relaxed. Therefore, it is possible to optimize the strength and rigidity around the joint portion and reduce the wall thickness of the plate member forming the cross member portion and the pipe material forming the other end side arm portion. Therefore, the weight of the swing arm can be reduced and the cost can be reduced.
  • a fourth aspect of the present invention comprises a reinforcing member (61) arranged inside the cross-sectional shape formed by the upper and lower divided bodies (47, 48) and connecting the upper and lower divided bodies (47, 48) to each other.
  • the reinforcing member (61) is arranged on one end side of the center (CL2) of the front-rear width (H2) of the cross member portion (33).
  • the reinforcing member connecting the upper and lower divided bodies is arranged on one end side of the center of the front-rear width of the cross member portion.
  • the resonance prevention effect can be obtained by swinging the drive chain and hitting the upper surface of the swing arm.
  • the reinforcing members (61) are provided in pairs on the left and right, and the cross member portion (33) and one end thereof are provided on each of the left and right sides of the upper and lower divided bodies (47, 48). It is arranged at a position straddling the side arm portion (41).
  • the pair of left and right reinforcing members makes it easy to reinforce the portion where the cross member portion and the one end side arm portion are connected to each other on both the left and right sides of the upper and lower split bodies.
  • the one end side edge portion (35) provided on the one end side of the cross member portion (33) is on the one end side toward the outer side in the vehicle width direction in the plan view of the swing arm (11).
  • the pair of left and right reinforcing members (61) are provided with a pair of left and right outer ends (35a) formed so as to be located at, and the pair of left and right reinforcing members (61) are separated from each other toward the other end in a plan view of the swing arm (11).
  • the inner end portion (65) inside the pair of left and right reinforcing members (61) in the vehicle width direction is joined to the outer end portion (35a) at one end of the pair of left and right reinforcing members.
  • the reinforcing members are arranged diagonally in the plan view of the swing arm, it is easy to secure the joining length even when the reinforcing members are joined to the inner surface of the upper and lower divided bodies.
  • the outer side of one end of the cross member is inclined so that it is located on one end side toward the outer side in the vehicle width direction. Join the inner ends of the sloping reinforcements (so that they are located).
  • the sandwiching angle formed between them becomes as large as possible (close to a right angle).
  • the stress concentration at the joint can be relaxed. Therefore, the strength and rigidity around the joint can be optimized, and the wall thickness of the plate member forming the upper and lower divided bodies and the reinforcing member can be reduced. Therefore, the weight of the swing arm can be reduced and the cost can be reduced.
  • the reinforcing member (61) is provided with a lightening hole (66), and the outer peripheral edge portion around the lightening hole (66) in the reinforcing member (61) and the said.
  • the inner surfaces of the upper and lower divided bodies (47, 48) are joined to each other.
  • a lightening hole is provided in the vicinity of a portion where the reinforcing member is joined to the inner surface of the upper and lower divided bodies (that is, a portion where strength and rigidity are easily ensured). Therefore, it is possible to reduce the weight of the reinforcing member and thus the swing arm while maintaining the strength and rigidity around the reinforcing member.
  • the upper and lower split bodies (47, 48) are joined to each other at their open ends, and the open end edge portion (47c) of one (47) of the upper and lower split bodies (47, 48) is joined to each other.
  • a covering portion (47d) that is attached to the open end edge portion (48c) of the other (48) of the upper and lower divided bodies (47, 48) so as to cover from the outer peripheral side, and the upper and lower divided bodies (47).
  • 48) are formed vertically symmetrically except for the covering portion (47d). Since the upper and lower divided bodies forming the front arm portion and the cross member portion are formed vertically symmetrically except for the open end edge portion, it is possible to share the mold for forming the upper and lower divided bodies. Therefore, the cost of the swing arm can be reduced.
  • a ninth aspect of the present invention is that the covering portion (47d) provided on one (47) of the upper and lower split bodies (47, 48) has a cross section orthogonal to the edge of the open edge portion (47c).
  • the cushion load input to the cushion connecting portion is suppressed from being directly transmitted (via only one of the upper and lower split bodies) to the bent portion of the covering portion.
  • stress concentration on the bent portion of the covering portion can be relaxed. Therefore, it is possible to reduce the wall thickness of the plate member forming the upper and lower divided bodies. Therefore, the weight of the swing arm can be reduced and the cost can be reduced.
  • FIG. 4 is a sectional view taken along line VI-VI of FIG. It is a rear view of the swing arm. It is a left side view of the front part of the swing arm. It is a top view which looked at the front part of the swing arm from above.
  • 9 is a cross-sectional view taken along the line XX of FIG. It is a perspective view which looked at the front part of the swing arm from the left rear upper side.
  • FIG. 10 is an enlarged view of the XIV portion of FIG. 10, showing a first modification of the embodiment. It is an enlarged view of the XIV part of FIG. 10, and shows the 2nd modification of embodiment.
  • this embodiment is applied to a motorcycle 1 as a saddle-riding vehicle.
  • the front wheels (steering wheels) 2 of the motorcycle 1 are suspended by a front wheel suspension device 3 including, for example, a telescopic front fork.
  • a bar handle 4 for steering the front wheels is provided on the upper portion of the front wheel suspension device 3.
  • the front wheel suspension device 3 is supported by the front end portion of the vehicle body frame 5.
  • a head pipe 6 that operably supports the front wheel suspension device 3 is provided at the front end of the vehicle body frame 5.
  • a pair of left and right main frames 7 extend diagonally rearward and downward on the upper rear side of the head pipe 6.
  • a pair of left and right down frames 7a are inclined more steeply than the main frame 7 in a side view (hereinafter, simply referred to as a side view) when viewed from the vehicle width direction (left and right direction). It extends diagonally backward and downward.
  • the rear ends of the left and right main frames 7 are connected to the upper ends of a pair of left and right pivot frames 8, respectively.
  • a power unit U powered by an engine (internal combustion engine) E is mounted inside the vehicle body frame 5 (below the left and right main frames 7, behind the left and right down frames 7a, and in front of the left and right pivot frames 8).
  • the power unit U and the rear wheels (driving wheels) 12 are connected via, for example, a drive chain D arranged on the left side of the rear portion of the vehicle body.
  • the front end portion (base end portion) of the swing arm 11 is supported by the left and right pivot frames 8.
  • the rear wheel 12 of the motorcycle 1 is supported at the rear end (tip) of the swing arm 11.
  • a rear cushion unit 13 is interposed between the front portion of the swing arm 11 and the vehicle body frame 5.
  • the rear cushion unit 13 is a unit integrally provided with a cushion spring and a damper.
  • the front end portion of the rear frame 9 is connected to the rear portion of the left and right pivot frames 8.
  • a seat 14 for seating an occupant is arranged above the rear frame 9.
  • a fuel tank 15 is arranged in front of the seat 14.
  • the front part of the vehicle body is covered with the front cowl 16, and the periphery of the rear frame 9 is covered with the rear cowl 17.
  • the rear wheel 12 of the motorcycle 1 is suspended by the rear wheel suspension device 10.
  • the rear wheel suspension device 10 includes a swing arm 11, a rear cushion unit 13, and a link mechanism 18.
  • the front end of the swing arm 11 is supported by the left and right pivot frames 8 of the vehicle body frame 5.
  • the front end portion of the swing arm 11 is supported by the left and right pivot frames 8 so as to be vertically swingable via a pivot shaft (swing shaft) 8a along the left and right directions.
  • a rear wheel 12 is supported at the rear end of the swing arm 11 via a rear wheel axle 12a along the left-right direction.
  • reference numeral C1 indicates the axis (central axis) of the pivot shaft 8a
  • reference numeral C2 indicates the axis (central axis) of the rear wheel axle 12a.
  • the structure of the swing arm 11 will be described in detail later.
  • the lower end of the rear cushion unit 13 is connected to the swing arm 11 via a link mechanism 18.
  • the upper end of the rear cushion unit 13 is connected to the vehicle body side.
  • the “vehicle body side” of the embodiment includes at least one of the vehicle body frame 5 (including the separate frame) and the power unit U.
  • the “vehicle body side” that connects the upper end portions of the rear cushion unit 13 is a cross frame (not shown) that extends between the upper portions of the left and right pivot frames 8 in the embodiment.
  • the rear cushion unit 13 is provided singly in the center of the left and right sides of the vehicle body, for example.
  • the rear cushion unit 13 is arranged so as to extend in the vertical direction so as to intersect the front portion of the swing arm 11 in a side view.
  • the rear cushion unit 13 is arranged so as to be inclined (forward tilted) in a side view so that the upper end portion is located on the front side of the lower end portion.
  • the rear cushion units 13 may be provided in pairs on the left and right, for example, between the rear frame 9 and the left and right arm portions 32 of the swing arm 11.
  • the link mechanism 18 is connected to the lower front portion of the swing arm 11, the lower end portion of the rear cushion unit 13, and the vehicle body side.
  • the “vehicle body side” that connects the link mechanism 18 is, for example, a cross frame (not shown) that connects the lower parts of the left and right pivot frames 8.
  • the rear wheel suspension device 10 swings the swing arm 11 upward as the rear wheel 12 moves upward, moves the lower end portion of the rear cushion unit 13 upward, and strokes the rear cushion unit 13 in the compression direction.
  • the rear wheel suspension device 10 swings the swing arm 11 downward as the rear wheel 12 moves downward, moves the lower end portion of the rear cushion unit 13 downward, and strokes the rear cushion unit 13 in the extension direction.
  • the rear wheel suspension device 10 swings the swing arm 11 up and down and expands and contracts the rear cushion unit 13 as the rear wheels 12 move up and down to absorb and dampen the reaction force from the road surface.
  • the swing arm 11 is formed by integrally connecting various steel parts, for example, by welding or the like.
  • the swing arm 11 includes a pivot pipe 31 extending in the left-right direction at its front end, a pair of left and right arm portions 32L and 32R extending in the front-rear direction behind the pivot pipe 31, and a front end of the pivot pipe 31 and the rear wheel 12.
  • a cross member portion 33 for connecting the front portions of the left and right arm portions 32L and 32R is provided between them.
  • the pair of left and right configurations such as the arm portions 32L and 32R may be distinguished by adding "L" to the left side code and "R" to the right side structure, or may collectively refer to only the numbers. ..
  • the pivot pipe 31 has a hollow shape with a circular cross section, and the pivot shaft 8a can be coaxially inserted into the hollow shape.
  • the pivot pipe 31 is provided apart from the front of the cross member portion 33.
  • the space surrounded by the pivot pipe 31, the cross member portion 33, and the front portions of the left and right arm portions 32L and 32R is the cushion arrangement space K1.
  • the rear cushion unit 13 is arranged in the cushion arrangement space K1 so as to penetrate in the vertical direction.
  • the range H1 inside the pivot pipe 31 in the vehicle width direction has a smaller diameter than the portion outside the vehicle width direction than this range H1. As a result, it is easy to secure a clearance with the rear cushion unit 13 arranged behind the pivot pipe 31.
  • the pivot pipe 31 is press-fitted with a pair of left and right bearings (not shown) on the inner peripheral side of a portion outside in the vehicle width direction, and is rotatably supported by the pivot shaft 8a via these left and right bearings.
  • the pivot pipe 31 is symmetrical with respect to the left and right center CL of the vehicle body.
  • the left-right center CL of the vehicle body is also the left-right center of the swing arm 11.
  • the front end portion 32f of the left and right arm portions 32 is welded to the rear side of the portion outside the vehicle width direction of the pivot pipe 31.
  • the front end portion 32f of the left and right arm portions 32 is cut out in a side view arc shape so as to be aligned with the outer peripheral surface of the portion outside the pivot pipe 31 in the vehicle width direction.
  • the vertical width of the left and right arm portions 32 is larger than the diameter of the pivot pipe 31.
  • the left and right arm portions 32 are formed to taper in the side view so as to narrow the vertical width toward the pivot pipe 31. Has been done.
  • the pivot portion of the swing arm 11 is not limited to the integrated pivot pipe 31 extending over the left and right arm portions 32, and may be divided into left and right.
  • the left and right arm portions 32 are divided into a front arm portion 41 and a rear arm portion 51, respectively.
  • the front arm portion 41 is formed in a hollow shape by the monaca structure of the upper and lower divided bodies 47 and 48, which will be described later.
  • the rear arm portion 51 is formed of, for example, a square pipe.
  • a cast end piece 55 is connected to the rear end portion of the rear arm portion 51 and thus the arm portion 32.
  • the rear wheel suspension device 10 in the side view of FIG. 1 shows a state in which it is in a 1G state (a state in which the rear cushion unit 13 is sunk by the weight of the vehicle).
  • the swing arm 11 (particularly the arm portion 32) shown in FIG. 1 is inclined backward downward and extends linearly in a side view.
  • the straight line T1 in the figure indicates a straight line connecting the axis of the pivot shaft 8a and the axis of the rear wheel axle 12a in a side view.
  • the straight line T1 is a reference line along the extending direction of the swing arm 11 (particularly the arm portion 32) in the side view.
  • the front arm portion 41 is divided into an upper arm portion 42 and a lower arm portion 43 with a plane along the straight line T1 as a dividing surface S1 in a side view.
  • the front arm portion 41 extends linearly along the straight line T1 in a side view.
  • the front arm portion 41 extends linearly so as to be parallel to the front-rear direction in a plan view of the swing arm 11.
  • the front end portion of the front arm portion 41 is the front end portion 32f of the arm portion 32.
  • the front arm portion 41 has a rectangular and hollow cross-sectional shape that is long in the vertical direction in a cross section orthogonal to the straight line T1 in a side view (corresponding to a cross section orthogonal to the extending direction of the front arm portion 41, see FIG. 5). Have.
  • reference numeral 41a indicates an upper surface portion
  • reference numeral 41b indicates a lower surface portion 41b
  • reference numeral 41c indicates an inner side surface portion inside the vehicle width direction
  • reference numeral 41d indicates an outer surface portion outside the vehicle width direction.
  • the front arm portion 41 is provided vertically symmetrically with the divided surface S1 as a symmetrical plane.
  • the left and right front arm portions 41 are symmetrical with respect to the left and right center CL of the vehicle body.
  • a notch portion 44 is formed by notching an outer surface portion 41d and a portion of the upper surface portion 41a and the lower surface portion 41b on the outer side in the vehicle width direction.
  • the outside of the hollow cross member portion 33 in the vehicle width direction is integrated.
  • the inner side surface portion 41c is eliminated.
  • Reference numeral P1 in the figure indicates the rear end of the front arm portion 41.
  • the upper surface portion 41a and the lower surface portion 41b remaining at the rear portion of the front arm portion 41 may be regarded as a part of the cross member portion 33.
  • the front end P2 of the notch portion 44 may be regarded as the rear end of the front arm portion 41.
  • the cross member portion 33 is provided so as to overlap the front arm portion 41 in a side view.
  • the cross member portion 33 may be provided so as to overlap the front arm portion 41 in a side view, for example.
  • the cross member portion 33 is provided in the same vertical width as the front arm portion 41.
  • the cross member portion 33 has a flat upper surface portion 34a and a lower surface portion 34b.
  • the upper surface portion 34a and the lower surface portion 34b of the cross member portion 33 are provided so as to be flush with the upper surface portion 41a and the lower surface portion 41b of the front arm portion 41, respectively.
  • the cross-member portion 33 has the smallest cross-sectional shape at the center in the vehicle width direction in a cross section orthogonal to the vehicle width direction.
  • the cross-member portion 33 When the cross-sectional shape (hollow rectangular shape) at the center of the cross member portion 33 in the vehicle width direction is used as the reference cross section, the cross-member portion 33 has a cross-sectional shape that expands as it is located outside the vehicle width direction from the reference cross section (cross section). It is formed (to increase the front-back width of the shape).
  • FIG. 3 is a plan view (referred to as a plan view of the swing arm 11 in the embodiment) viewed from a vertical direction (referred to as a swing arm vertical direction in the embodiment) orthogonal to the divided surface S1.
  • the cross member portion 33 is formed so as to widen the front-rear width toward the outside in the vehicle width direction.
  • the leading edge portion 35 of the cross member portion 33 is formed in an arc shape that opens forward (a circular arc shape that is convex rearward).
  • the leading edge outer portion 35a the defined range on the outer side of the leading edge portion 35 in the vehicle width direction.
  • the leading edge outer portion 35a is, for example, a range of about the outer portion when the leading edge portion 35 is divided into three equal parts in the vehicle width direction.
  • a chamfered portion 35b is formed inside the leading edge portion 35 in the vehicle width direction so as to cut out the upper and lower corner portions of the leading edge portion 35. As a result, it is easy to secure a clearance with the rear cushion unit 13 when the swing arm 11 swings.
  • the trailing edge portion 36 of the cross member portion 33 is formed so as to form a trapezoidal concave portion that opens rearward (forms a trapezoidal concave portion that is convex forward).
  • the trailing edge portion 36 is formed by combining flat shapes.
  • the defined range on the outer side of the trailing edge portion 36 in the vehicle width direction is referred to as the trailing edge outer portion 36a.
  • the trailing edge outer portion 36a is, for example, a range of about the outer portion when the trailing edge portion 36 is divided into three equal parts in the vehicle width direction (when the trailing edge portion 36 is trapezoidal, the range is about the inclined side thereof. ).
  • the cross member portion 33 is divided into an upper cross member portion 37 and a lower cross member portion 38 with a plane along the straight line T1 as a dividing surface S1 in a side view.
  • the upper cross member portion 37 is integrally formed with a pair of left and right upper arm portions 42.
  • the upper cross member portion 37 and the left and right upper arm portions 42 are integrated to form an integrated upper split body 47.
  • the lower cross member portion 38 is integrally formed with a pair of left and right lower arm portions 43.
  • the lower cross member portion 38 and the left and right lower arm portions 43 are integrated to form an integrated lower split body 48.
  • the upper split body 47 has an upper surface portion 47a parallel to the split surface S1 and a side surface portion 47b extending downward from an appropriate outer edge of the upper surface portion 47a.
  • the upper split body 47 has a hollow shape that opens downward as a whole.
  • the lower split body 48 has a lower surface portion 48a parallel to the split surface S1 and a side surface portion 48b extending upward from an appropriate outer edge of the lower surface portion 48a.
  • the lower split body 48 has a hollow shape that opens upward as a whole.
  • the upper and lower divided bodies 47 and 48 are integrally press-molded products, and their open ends are combined with each other and welded together integrally with each other.
  • the upper and lower split bodies 47 and 48 constitute a swing arm front portion 49 in which the front arm portion 41 and the cross member portion 33 are integrated.
  • the open end edge portion 47c of the upper split body 47 (the tip edge portion of the side surface portion 47b) is provided with a joggle portion 47d which is attached (outer frame) so as to cover the open end edge portion 48c of the lower split body 48 from the outer surface side.
  • the jogging portion 47d is provided with a bent portion 47e that bends toward the outer surface side in a cross section orthogonal to the edge of the open end edge portion 47c on the upper end side (base end side) thereof.
  • a cushion connecting portion 39 is attached to the lower surface portion 48a of the lower split body 48. A downward load received from the lower end of the rear cushion unit 13 is input to the cushion connecting portion 39.
  • the upper and lower divided bodies 47 and 48 are formed so that the hollow basic shape open to the mating side is vertically symmetrical with the divided surface S1 as the symmetrical plane, except for the jogging portion 47d.
  • the upper and lower divided bodies 47 and 48 are provided symmetrically with respect to the left and right center CL of the vehicle body.
  • the jogging portion 47d is provided below the split surface S1 (on the tip end side of the side surface portion 47b).
  • the rear arm portion 51 extends linearly from the vicinity of the front end P2 of the cutout portion 44 to the rear along the straight line T1 in a side view.
  • the front portion of the rear arm portion 51 is inserted into the front arm portion 41 from the notch portion 44.
  • the front end portion 51f of the rear arm portion 51 is inserted to the front of the front end P2 of the notch portion 44.
  • the front end portion 51f of the rear arm portion 51 is located behind the front end P3 at the center of the cross member portion 33 in the vehicle width direction (terminates behind the front end P3).
  • the rear arm portion 51 has a rectangular and hollow cross-sectional shape that is long in the vertical direction in a cross section orthogonal to the straight line T1 in a side view (generally corresponding to a cross section orthogonal to the extending direction of the rear arm portion 51, see FIG. 6). have.
  • reference numeral 51a indicates an upper surface portion
  • reference numeral 51b indicates a lower surface portion
  • reference numeral 51c indicates an inner side surface portion
  • reference numeral 51d indicates an outer surface portion.
  • the cross-sectional shape of the rear arm portion 51 has a rectangular shape that is smaller than the cross-sectional shape of the front arm portion 41 by the wall thickness of the front arm portion 41.
  • the rear arm portion 51 is inserted so that the outer surface is aligned with the inner surface of the front arm portion 41.
  • the rear arm portion 51 is provided vertically symmetrically with the divided surface S1 as a symmetrical plane.
  • the front portions of the left and right rear arm portions 51L and 51R have front inclined portions 52L and 52R that are inclined so as to be separated from each other toward the rear side in a plan view of the swing arm 11.
  • the rear portions of the left and right rear arm portions 51L and 51R have rear parallel portions 53 formed so as to be parallel to the front-rear direction and parallel to each other in a plan view of the swing arm 11.
  • the left and right rear arm portions 51L and 51R are asymmetrical with each other.
  • the front inclined portion 52L of the left rear arm portion 51L is formed longer than the front inclined portion 52R of the right rear arm portion 51R.
  • the rear parallel portion 53L of the left rear arm portion 51L has a larger offset amount from the center of the left and right sides of the vehicle body than the rear parallel portion 53R of the right rear arm portion 51R.
  • the rear parallel portion 53L of the left rear arm portion 51L is formed shorter than the rear parallel portion 53R of the right rear arm portion 51R.
  • the inner edge portions 51c1 (corresponding to the inner side surface portion 51c) of the left and right rear arm portions 51L and 51R are welded to the trailing edge outer portions 36a of the trailing edge portions 36 of the cross member portion 33, respectively. It is combined.
  • the inner edge portions 51c1 of the left and right rear arm portions 51L and 51R are inclined so as to be located on the rear side in the vehicle width direction with respect to the front-rear direction.
  • the left and right trailing edge outer portions 36a of the cross member portion 33 are inclined so as to be located on the rear side toward the outer side in the vehicle width direction with respect to the left and right direction.
  • the following It becomes a composition. That is, the inner edge portion 51c1 of the rear arm portion 51 and the trailing edge outer portion 36a of the cross member portion 33 are joined so as to be connected as smoothly as possible (so as to form an obtuse angle in the plan view of the swing arm 11).
  • the end piece 55 is integrally welded to the rear end of the rear arm 51.
  • the end piece 55 is, for example, a cast molded product, and is provided so as to be continuously connected to the rear end portion of the rear arm portion 51.
  • the front end portion of the end piece 55 is inserted into the rear end portion of the rear arm portion 51 by a specified amount, and in this state, the end piece 55 is welded to the rear end portion of the rear arm portion 51.
  • the end piece 55 has an insertion hole 55a for inserting and supporting the rear wheel axle 12a.
  • the insertion hole 55a is formed in an elliptical shape long in the front-rear direction so that the rear wheel axle 12a can be moved by a specified amount in the front-rear direction.
  • a cushion connecting portion 39 is provided on the lower side of the cross member portion 33.
  • the cushion connecting portion 39 projects downward from the lower surface of the cross member portion 33.
  • the cushion connecting portion 39 holds a cylindrical holder portion 39b along the left-right direction on the tip end side of the base bracket 39a. Inside the holder portion 39b, a similarly cylindrical collar portion 39c is rotatably held via a bearing.
  • the input end of the link mechanism 18 is connected to the collar portion 39c, and the lower end portion of the rear cushion unit 13 is connected to the cross member portion 33 via the link mechanism 18.
  • a downward load received from the rear cushion unit 13 is input to the cushion connecting portion 39 and thus to the cross member portion 33 via the link mechanism 18.
  • a pair of left and right reinforcing members 61L and 61R connecting the upper and lower divided bodies 47 and 48 are provided inside the cross-sectional shape formed by the upper and lower divided bodies 47 and 48.
  • the reinforcing members 61L and 61R are provided at positions straddling each of the left and right end portions 34L and 34R of the cross member portion 33 and each of the left and right front arm portions 41L and 41R on the left and right sides of the swing arm front portion 49. ..
  • Each reinforcing member 61L, 61R serves as a reinforcing wall inside the swing arm front portion 49.
  • the reinforcing members 61L and 61R reinforce the portions where the cross member portion 33 and the front arm portion 41 are connected on both the left and right sides of the swing arm front portion 49.
  • the reinforcing member 61 has a flat plate shape along the vertical direction of the swing arm, and has a rectangular upper portion 62 and a lower portion 63.
  • the upper portion 62 is formed in a rectangular shape that matches the inner surface of the upper split body 47 in a U-shape in cross section.
  • the lower portion 63 is formed in a rectangular shape having a narrower width than the upper portion 62. Both side portions of the lower portion 63 are separated from both side surface portions 48b of the lower split body 48.
  • a lower end flange 64 is formed along the inner surface of the lower surface portion 48a of the lower split body 48.
  • the peripheral edge of the upper portion 62 is welded to the inner surface of the upper split body 47 in a state where the peripheral edges (upper edge and both side edges) of the upper portion 62 are aligned with the inner surface of the upper split body 47.
  • the reinforcing member 61 first welds and connects the three sides of the upper portion 62 to the inner surface of the upper divided body 47. After that, the upper and lower split bodies 47 and 48 are combined with each other to weld-bond these open end edge portions 47c and 48c to each other, and the lower end flange 64 of the reinforcing member 61 is weld-bonded to the lower split body 48.
  • a plug hole 64a slightly smaller than the lower end flange 64 is formed at a portion of the lower surface portion 48a of the lower split body 48 where the lower end flange 64 of the reinforcing member 61 overlaps.
  • the upper and lower split bodies 47 and 48 are combined with each other, and the lower end flange 64 is plug-welded to the lower split body 48 using the plug hole 64a.
  • the reinforcing member 61 is welded and fixed to the inside of the cross section of the upper and lower divided bodies 47 and 48.
  • the reinforcing member 61 connecting the upper and lower split bodies 47 and 48 is internally welded only to the upper split body 47, and only the lower end flange 64 is plug-welded from the outside to the lower split body 48, so that the process can be established. Is secured. Since the plug welded portion is arranged on the lower surface of the swing arm 11 and the plug welded portion is not exposed on the upper surface of the swing arm 11, the appearance is improved and muddy water, foreign matter and the like are suppressed from accumulating on the plug welded portion.
  • the reinforcing member 61 is arranged in front of the central CL2 of the front-rear width (width between the front end P3 and the rear end P4) H2 at the center of the cross member portion 33 in the vehicle width direction.
  • the reinforcing member 61 is arranged in front of the front end P3 at the center of the cross member portion 33 in the vehicle width direction. This makes it easier for the reinforcing member 61 to reinforce the front arm portion 41, and also makes it easier to reinforce the portion where the front arm portion 41 and the cross member portion 33 are connected to each other.
  • the pair of left and right reinforcing members 61 are arranged in a V shape with the front side convex so as to be separated from each other toward the rear side in the plan view of the swing arm 11.
  • a joining length welding length
  • the inner end portion 65 of the reinforcing member 61 inside in the vehicle width direction is joined to the inner surface of the leading edge outer portion 35a of the cross member portion 33. That is, the inner end portion 65 of the reinforcing member 61 inclined so as to be separated from each other toward the rear side is inclined so as to be located on the front side toward the outer side in the vehicle width direction of the front edge portion 35 of the cross member portion 33. It is joined to the portion 35a.
  • the joint portion between the leading edge outer portion 35a of the cross member portion 33 and the inner end portion 65 of the reinforcing member 61 they approach an orthogonal arrangement (the sandwich angle ⁇ 1 between them approaches a right angle) and a corner. Easy to perform meat welding.
  • a circular lightening hole 66 is provided in the center of the upper portion 62 of the reinforcing member 61. Since the three sides of the upper portion 62 of the reinforcing member 61 are welded to the inner surface of the upper split body 47 (see FIG. 10), the lightening hole 66 is surrounded by the joints of the three sides. As a result, the influence of the lightening hole 66 provided on the upper portion 62 on the strength and rigidity of the reinforcing member 61 is suppressed, and the weight is reduced.
  • the swing arm structure of the embodiment is the structure of the swing arm 11 in which the front end side is pivotally supported on the vehicle body side so as to swing up and down and the rear wheel 12 is pivotally supported on the rear end side.
  • Reference numeral 11 denotes a pivot pipe 31 located on the front end side and supported by the swing shaft, a pair of left and right arm portions 32L and 32R extending from the pivot pipe 31 to the rear wheel axle support position toward the rear end side, and more than the pivot pipe 31.
  • a cross member portion 33 that is located on the rear end side and connects the pair of left and right arm portions 32L and 32R to each other is provided.
  • the front arm portion 41 is divided into an upper arm portion 42 and a lower arm portion 43 that are combined with each other, and the rear arm portion 51 is provided so as to be connected to the front arm portion 41 and is composed of a pipe material, and is a cross member.
  • the portion 33 is divided into an upper cross member portion 37 and a lower cross member portion 38 that are combined with each other, and the upper cross member portion 37 and the upper arm portion 42 are integrally formed with each other to form the upper divided body 47, and the lower portion 33 is formed.
  • the cross member portion 38 and the lower arm portion 43 are integrally formed with each other to form the lower split body 48.
  • the front arm portion 41 and the cross member portion 33 of the swing arm 11 can be composed of the upper and lower divided bodies 47 and 48 which are separate from the rear arm portion 51.
  • the upper and lower divided bodies 47 and 48 can each be a press-formed product obtained by pressing a plate member (metal plate) such as a steel plate, and can have a Monaca structure in which these open ends are joined to each other. be.
  • a plate member metal plate
  • Monaca structure in which these open ends are joined to each other.
  • the front end portion 51f of the rear arm portion 51 is arranged behind the front end P3 of the intermediate portion of the cross member portion 33.
  • the position of the front end portion 51f of the rear arm portion 51 made of the pipe material is limited to the rear side of the front end P3 of the intermediate portion forming the reference cross section of the cross member portion 33, thereby limiting the position of the front end portion 51f of the pipe material. It is possible to reduce the weight by suppressing the length of the pipe. Further, by suppressing the length of the rear arm portion 51, it is possible to reduce the weight and cost by reducing the wall thickness while maintaining the strength and rigidity required for the rear arm portion 51.
  • an inner edge portion 51c1 formed so as to be separated from each other toward the rear side in a plan view of the swing arm 11 is provided inside a pair of left and right rear arm portions 51 in the vehicle width direction, and a cross member is provided.
  • the trailing edge portion 36 of the portion 33 includes a pair of left and right trailing edge outer portions 36a formed so as to be located on the rear side toward the outer side in the vehicle width direction in the plan view of the swing arm 11, and the left and right pair of trailing edge outer portions 36a. Is joined to each inner edge portion 51c1 of the pair of left and right rear arm portions 51.
  • the inner edge portion 51c1 of the rear arm portion 51 and the trailing edge outer portion 36a of the cross member portion 33 are joined so as to be connected as smoothly as possible in the plan view of the swing arm 11.
  • the stress concentration at the joint can be relaxed. Therefore, the strength and rigidity around the joint portion can be optimized, and the wall thickness of the plate member forming the cross member portion 33 and the pipe material forming the rear arm portion 51 can be reduced. Therefore, the weight of the swing arm 11 can be reduced and the cost can be reduced.
  • a reinforcing member 61 is provided inside the cross-sectional shape formed by the upper and lower divided bodies 47 and 48 to connect the upper and lower divided bodies 47 and 48, and the reinforcing member 61 is a cross member portion 33. It is arranged in front of the central CL2 of the front-rear width H2 in the middle portion. According to this configuration, the reinforcing member 61 connecting the upper and lower divided bodies 47 and 48 is arranged in front of the central CL2 of the front-rear width H2 of the intermediate portion forming the reference cross section of the cross member portion 33.
  • the reinforcing members 61 are provided in pairs on the left and right, and are arranged at positions straddling the cross member portion 33 and the front arm portion 41 on each of the left and right sides of the upper and lower divided bodies 47 and 48. There is.
  • the pair of left and right reinforcing members 61 makes it easy to reinforce the portion where the cross member portion 33 and the front arm portion 41 are connected to each other on both the left and right sides of the upper and lower divided bodies 47 and 48.
  • the wall thickness of the plate members forming the upper and lower divided bodies 47 and 48 can be reduced, and the weight and cost of the swing arm 11 can be reduced.
  • the front edge portion 35 of the cross member portion 33 is a pair of left and right front edge outer portions 35a formed so as to be located on the front side toward the outer side in the vehicle width direction in the plan view of the swing arm 11.
  • the pair of left and right reinforcing members 61 are arranged so as to be separated from each other toward the rear side in the plan view of the swing arm 11, and the pair of left and right reinforcing members 61 have a pair of left and right inner end portions 65 on the inner side in the vehicle width direction. It is joined to the outer side portion 35a of the leading edge.
  • the reinforcing member 61 is arranged diagonally in the plan view of the swing arm 11, it is easy to secure the joining length even when the reinforcing member 61 is joined to the inner surfaces of the upper and lower divided bodies 47 and 48.
  • the leading edge portion 35 of the cross member portion 33 is inclined so as to be located on the front side toward the outside in the vehicle width direction, so as to be separated from each other toward the rear side (that is, the rear side is outside in the vehicle width direction).
  • the inner end 65 of the inclined reinforcing member 61 (so as to be located at) is joined.
  • the sandwiching angle ⁇ 1 formed between them becomes as large as possible (close to a right angle). This facilitates welding at the joint. Therefore, the strength and rigidity around the joint can be optimized, and the wall thickness of the plate members forming the upper and lower divided bodies 47 and 48 and the reinforcing member 61 can be reduced. Therefore, the weight of the swing arm 11 can be reduced and the cost can be reduced. Since the leading edge portion 35 has an arc shape, stress concentration can be easily avoided, and in this respect as well, strength and rigidity can be optimized to reduce costs and weight.
  • the reinforcing member 61 is provided with a lightening hole 66, and the outer peripheral edge portion around the lightening hole 66 in the reinforcing member 61 and the inner surfaces of the upper and lower divided bodies 47 and 48 are joined to each other. ing.
  • the lightening hole 66 is provided in the vicinity of the portion where the reinforcing member 61 is joined to the inner surfaces of the upper and lower divided bodies 47 and 48 (that is, the portion where the strength and rigidity are easily ensured). Therefore, it is possible to reduce the weight of the reinforcing member 61 and thus the swing arm 11 while maintaining the strength and rigidity around the reinforcing member 61.
  • the upper and lower split bodies 47 and 48 are joined to each other with their open ends, and the open end edge portion 47c of the upper split body 47 has an outer circumference around the open end edge portion 48c of the lower split body 48.
  • a joggle portion 47d that is mounted so as to cover from the side is provided, and the upper and lower divided bodies 47 and 48 are formed vertically symmetrically except for the joggle portion 47d. Since the upper and lower divided bodies 47 and 48 forming the front arm portion 41 and the cross member portion 33 are formed vertically symmetrically except for the open end edge portions 47c and 48c, a mold for forming the upper and lower divided bodies 47 and 48 can be formed. It becomes possible to share. Therefore, the cost of the swing arm 11 can be reduced.
  • FIGS. 14A and 14B a modified example in which the molds of the upper and lower divided bodies 47 and 48 are shared will be described with reference to FIGS. 14A and 14B.
  • the end faces of the open edge portions 47c and 48c of the upper and lower split bodies 47 and 48 are butted against each other on the split surface S1, and the open end edge portions 47c and 48c of the upper and lower split bodies 47 and 48 are abutted against each other.
  • Reference numeral B in the figure indicates a weld bead.
  • edge flanges 47f and 48f standing up to the outer surface side are formed on the open edge portions 47c and 48c of the upper and lower split bodies 47 and 48, respectively, and the edge flanges 47f and 48f are separated from each other by the split surfaces S1. They are butted against each other on the top, and these end edge flanges 47f and 48f are welded to each other from the outer surface side of the upper and lower divided bodies 47 and 48 (matching).
  • the joggle portion 47d is provided for welding from the viewpoint of easily stabilizing the welding quality (joggling alignment). ..
  • the jogging portion 47d provided on the upper split body 47 includes a bent portion 47e that bends toward the outer surface in a cross section orthogonal to the edge of the open end edge portion 47c, and the lower split body 48 has a bent portion 47e.
  • a cushion connecting portion 39 connected to the link mechanism 18 on the rear cushion unit 13 side is provided. According to this configuration, the cushion load input to the cushion connecting portion 39 is suppressed from being directly transmitted (via only the upper split body 47) to the bent portion 47e of the jogging portion 47d. As a result, the stress concentration of the joggle portion 47d on the bent portion 47e can be relaxed. Therefore, it is possible to reduce the wall thickness of the plate members forming the upper and lower divided bodies 47 and 48. Therefore, the weight of the swing arm 11 can be reduced and the cost can be reduced.
  • the swing arm 11 is configured by combining steel materials, but is not limited to this.
  • the swing arm may be configured by combining aluminum materials.
  • an extruded aluminum material may be used for the rear arm portion.
  • Vehicles to which the present invention is applied include all vehicles including a swing arm that supports wheels. That is, not only motorcycles (including motorized bicycles and scooter type vehicles), but also three-wheeled vehicles (including front two-wheeled and rear one-wheeled vehicles in addition to front one-wheeled and rear two-wheeled vehicles) or four-wheeled vehicles, and Vehicles that include an electric motor as a prime mover are also included.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Axle Suspensions And Sidecars For Cycles (AREA)
PCT/JP2020/018312 2020-04-30 2020-04-30 スイングアーム構造 Ceased WO2021220483A1 (ja)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230182846A1 (en) * 2021-12-15 2023-06-15 Bryce Barsnick Motorbike swingarm cover

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6371491A (ja) * 1986-09-12 1988-03-31 本田技研工業株式会社 自動二輪車のリヤフオ−ク
JPH01262281A (ja) * 1988-04-08 1989-10-19 Yamaha Motor Co Ltd 自動二輪車のリヤアーム構造
JP2003237671A (ja) * 2002-02-15 2003-08-27 Honda Motor Co Ltd 車両用スイングアーム
JP2003312577A (ja) * 2002-04-22 2003-11-06 Honda Motor Co Ltd 車両用スイングアーム
JP2013047036A (ja) * 2011-08-29 2013-03-07 Honda Motor Co Ltd 小型車両用スイングアーム

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6371491A (ja) * 1986-09-12 1988-03-31 本田技研工業株式会社 自動二輪車のリヤフオ−ク
JPH01262281A (ja) * 1988-04-08 1989-10-19 Yamaha Motor Co Ltd 自動二輪車のリヤアーム構造
JP2003237671A (ja) * 2002-02-15 2003-08-27 Honda Motor Co Ltd 車両用スイングアーム
JP2003312577A (ja) * 2002-04-22 2003-11-06 Honda Motor Co Ltd 車両用スイングアーム
JP2013047036A (ja) * 2011-08-29 2013-03-07 Honda Motor Co Ltd 小型車両用スイングアーム

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230182846A1 (en) * 2021-12-15 2023-06-15 Bryce Barsnick Motorbike swingarm cover
US12497119B2 (en) * 2021-12-15 2025-12-16 Bryce Barsnick Motorbike swingarm cover

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