JP4202785B2 - Rear cushion mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mounting structure for a rear cushion in a motorcycle.
[0002]
[Prior art]
In a rear suspension mechanism such as a motorcycle, the front end of the rear swing arm on the vehicle body is swingably supported by a pivot shaft, and a cushion bracket is provided on the front end side of the rear swing arm. There is one in which the lower part and the vehicle body side are connected by a link, and the upper and lower sides of the rear cushion are supported between the link and the cushion bracket (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
JP 2002-68066 A [0004]
[Problems to be solved by the invention]
By the way, the cushion bracket is provided in a pair of left and right rear swing arms so as to protrude upward in a substantially mountain shape. Each cushion bracket supports the rear cushion at the upper end, which is a free end, and is supported by the rear swing arm only at the lower end. Therefore, the cushion brackets are structured so as to support the rear cushion in a cantilevered manner when viewed on the left and right sides. For this reason, the cushion bracket has to be large in order to ensure sufficient mounting rigidity to support a large load of the rear cushion, resulting in an increase in weight and an increase in cost. Accordingly, an object of the present invention is to make the cushion bracket highly rigid and small, light and inexpensive.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the invention according to claim 1 relating to the mounting structure of the rear cushion of the present application is a rear swing arm that is supported so that the front end is swingable to the vehicle body side via a pivot shaft and supports the rear wheel at the rear end. And a cushion bracket provided at the upper part on the front end side of the rear swing arm, a link for connecting the lower part on the front end side of the rear swing arm to the vehicle body side, and a rear cushion that supports the link and the cushion bracket up and down. In the rear suspension
The rear swing arm includes a pair of left and right arm portions, and the front end sides of the left and right arm portions are connected by first and second cross members provided at intervals in the front and rear.
The cushion bracket is also provided in a pair on the left and right sides, and the front and rear ends thereof are connected to the first and second cross members,
The first cross member is supported between the left and right arm portions separated from each other and supported by upper portions of left and right projecting portions provided at the respective tip portions supporting the pivot shaft. Arranged above the pivot shaft so as to be disposed above the arm portion and partially overlap the pivot shaft in plan view;
Each of the left and right cushion brackets is located inside the left and right arm portions and extends in the front-rear direction beyond the upper portion of the rear cushion in a side view, and the upper portion of the rear cushion between each middle portion in the front-rear direction. It is characterized by supporting.
[0006]
In the invention the above claim 1 of claim 2, a boss is provided which projects inwardly respectively to the left and right cushion brackets, upper left and right of the rear cushion is characterized in that it is supported by these bosses.
[0007]
According to a third aspect of the present invention, in the second aspect, the rear cushion is supported at an upper portion between the left and right cushion brackets and includes a sub-cylinder. The sub-cylinder includes the left and right cushion brackets and the front and rear first cushion brackets. and characterized by being arranged through a space surrounded by the second cross member.
[0008]
【The invention's effect】
According to the first aspect of the present invention, the cushion bracket is extended to the front and rear beyond the upper portion of the rear cushion, and both ends thereof are connected to the rear swing arm. Has a structure that supports both rear cushions in side view. For this reason, the mounting rigidity of the cushion bracket is increased, and further, the size and weight can be reduced, and the cost can be reduced.
[0009]
Also, the rear swing arm is provided with a pair of left and right arms, and a pair of cushion brackets is provided. The front and rear ends of the left and right cushion brackets are provided with a front-to-back spacing between the upper portions of the left and right arms. Since the upper portion of the rear cushion is connected between the middle portions of the left and right cushion brackets, the connecting portion can be made most rigid.
[0010]
According to claim 3, the first and the left and right cushion brackets before and after the space surrounded by the second cross member is formed, by utilizing this space, it can be arranged sub cylinder of the rear cushion. Moreover, it is not necessary to provide a special space for disposing the sub cylinder, and space efficiency is improved.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments will be described below with reference to the drawings. 1 to 4 relate to an embodiment applied to a double-supported rear swing arm, FIG. 1 is a side view of a motorcycle according to this embodiment, FIG. 2 is a side view of a rear suspension, and FIG. FIG. 4 is a plan view of the link mechanism.
[0012]
In FIG. 1, 1 is a front wheel, 2 is a front fork, 3 is a head pipe, 4 is a handle, and 5 is a main frame. The main frame 5 has a vertically long rectangular tube shape made of a light alloy, is divided from the head pipe to the left and right, and extends obliquely downward to the rear.
[0013]
An inline 4-cylinder engine 6 is supported below the main frame 5. The supporting points are two points, that is, a connecting point 7 between the middle portion of the main frame 5 and the upper part of the cylinder, and a connecting point 9 between the rear end of the main frame 5 and the upper rear end of the transmission case 8 constituting the engine 6.
[0014]
The intake port 10 of the engine 6 is inhaled by a downdraft from an air cleaner 11 supported by the main frame 5. Reference numeral 12 denotes an injector. The air cleaner 11 is accommodated in a recess formed on the front bottom surface side of the fuel tank 13.
[0015]
An exhaust pipe 16 extends forward from the exhaust port 15, extends rearward under the engine 6, and is connected to a pair of left and right mufflers 17. The left and right mufflers 17 are disposed on both sides of the rear wheel 18. Reference numeral 19 denotes a radiator disposed in front of the engine 6.
[0016]
A pair of left and right seat rails 20 are provided obliquely upward and rearward from the rear end of the main frame 5, a rear cowl 21 is provided around the periphery, and a seat 22 is provided thereon.
[0017]
A front end portion of the rear swing arm 24 is supported by a pivot shaft 23 so as to be swingable in the vertical direction at the middle portion of the rear end of the transmission case 8 in the vertical direction. A rear wheel 18 is supported at the rear end of the rear swing arm 24.
[0018]
Reference numeral 25 denotes a rear cushion. Reference numeral 26 is a step bracket, 27 is an output sprocket, 28 is a chain, and 29 is a driven sprocket. Further, the front cowl 30 covers the front surface of the vehicle body from the left and right side surfaces.
[0019]
The case including the crankcase 31 and the transmission case 8 of the engine 6 is divided into upper and lower parts, and the pivot shaft 23 is slightly shifted downward from the split surface 32.
[0020]
As shown in FIGS. 2 and 3, the rear swing arm 24 has a pair of left and right arm portions 33 and is a double-supported type that supports the rear wheel 18 from both sides thereof. 34 and the second cross member 35 are connected. The first cross member 34 and the second cross member 35 are provided with a space in the front-rear direction, the first cross member 34 has a pipe shape, and both end support portions are provided on the upper surfaces of the front ends of the left and right rear swing arms 24. Further, the protrusion 36 protrudes upward.
[0021]
The tip 33a of the arm 33 on which the projection 36 is formed is a portion that supports the pivot shaft 23, and is formed by casting or the like together with the projection 36 using an appropriate material such as a light alloy.
[0022]
The second cross member 35 is a cross member integrated with the left and right arm portions 33 by welding or the like. Between the first cross member 34 and the second cross member 35, a pair of left and right cushion brackets 37 extending in parallel in the front-rear direction with a space in the left-right direction are provided. The cushion bracket 37 extends forward and backward beyond the upper end portion 38 of the rear cushion 25, and the front and rear end portions are welded to the upper surfaces of the first cross member 34 and the second cross member 35, respectively.
[0023]
As apparent from FIG. 3, a space 39 having a substantially rectangular shape in plan view surrounded by the first cross member 34, the second cross member 35, and the left and right cushion brackets 37 is formed, and the upper portion 38 is located therein. Further, the auxiliary cylinder 40 passes through the space 39 and extends obliquely upward from the upper portion 38 and extends backward.
[0024]
In the upper portion 38, a stepped bolt 41 crossing each intermediate portion of the left and right cushion brackets 37 penetrates from one (left side in the figure) to the other (right side in the figure) and is fastened to a nut 42 provided on the other side. Supported. At this time, the left and right sides of the upper portion 38 are supported by bosses 37 a that are formed in the central portion of the cushion bracket 37 and project inward. For this reason, support rigidity becomes higher.
[0025]
The pivot shaft 23 is located in the vicinity of the first cross member 34 in a plan view, and a pair of outer pressing plates 43 are provided at both left and right ends thereof. Step brackets 26 (see FIG. 2) are attached to the rear ends of the left and right outer pressing plates 43, respectively.
[0026]
The outer presser plate 43 is provided with a boss 44 that is long in the front-rear direction, and a split surface 45 is formed at an intermediate portion thereof, so that the bolt 46 is fastened from the rear of the boss 44 so that the pivot shaft 23 is fastened and fixed. It has become. Reference numeral 47 in FIG. 3 is a bolt that fastens the upper and lower divisions of the mission case 8 from above.
[0027]
As shown in FIG. 2, the rear cushion 25 includes a damper 50 and a cushion spring 51, and the upper and lower sides of the cushion spring 51 are supported by retainers 52 and 53 provided on the upper and lower outer peripheries of the damper 50, respectively.
[0028]
A piston actuating member 54 for actuating a piston of the damper 50 that is not visible in the drawing extends downward from the damper 50, and its lower end is connected to a vertex 56 of a first link 55 having a substantially triangular shape. The other end apex 57 is pivotally attached to a stay 58 that extends from the lower rear end of the mission case 8.
[0029]
One end of a linear link arm 60 is connected to the vertex 59 in the middle of the first link 55, and the other end is connected to a link pivot 61. The link pivot 61 is provided on a protrusion 62 that protrudes downward from the lower end of the second cross member 35.
[0030]
As shown in FIG. 4, the lower end 54 a of the piston actuating member 54 has a bifurcated shape, sandwiches the left and right of the apex portion 56, and is fixed with nuts 64 through bolts 63 to the openings provided in the apex portion 56 and the piston actuating member 54. Connect with The bolt 63 is passed through the collar 65, and a bearing 66 is supported between the collar 65 and one vertex 56.
[0031]
The other parts have the same structure, and the other end apex 57 is inserted into a recess 67 formed at the center in the width direction of the stay 58, and is connected by a stepped bolt 70 and a nut 71 via bearings 68 and 69. Is done.
The apex 59 is connected by a bolt 74 and a nut 75 via a collar 72 and a bearing 73.
The link pivot 61 is a bolt and is connected by a nut 78 through a collar 76 and a bearing 77.
[0032]
Next, the operation of this embodiment will be described. 2 and 3, when a load is input from the road surface to the rear wheel 18 and the rear wheel 18 swings counterclockwise (upward) in the drawing, the link arm 60 moves the first link 55 in the same counterclockwise direction. In order to rotate, the piston operating member 54 is pushed upward while compressing the cushion spring 51 against the cushion spring 51, and a damping force is generated in the damper 50.
[0033]
When there is no load input to the rear wheel 18, the first link 55 and the rear swing arm 24 are rotated in the reverse direction by the restoration of the cushion spring 51 and returned to the original state.
[0034]
In this way, the cushion bracket 37 is extended to the front and back beyond the upper portion 38 of the rear cushion 25, and both ends thereof are connected to the upper portion on the front end side of the arm portion 33 in the rear swing arm 24. When the upper portion 38 of the rear cushion is supported, the cushion bracket 37 has a double-sided structure. For this reason, the mounting rigidity of the cushion bracket 37 is increased, and the size and weight can be reduced, thereby reducing the cost.
[0035]
Further, the rear swing arm 24 is provided with a pair of left and right arms 33 and a pair of cushion brackets 37 is provided. The front and rear ends of the left and right cushion brackets 37 are located between the upper portions on the front end side of the left and right arms 33. Since it is connected to a pair of cross members consisting of first and second cross members 34, 35 provided at intervals in the front and rear, when the upper portion 38 of the rear cushion is connected between the middle portions of the left and right cushion brackets 37, It will be supported by the cushion bracket 37 having a holding structure, and the support portion can be most rigid.
[0036]
Further, since a space 39 surrounded by the left and right cushion brackets 37 and the front and rear first and second cross members 34 and 35 is formed, the sub-cylinder 40 of the rear cushion 25 is arranged using this space 39. it can. In addition, it is not necessary to provide a special space for disposing the sub cylinder 40, and space efficiency is improved.
[0037]
In addition, since the protrusion 62 of the link pivot 61 is integrally provided on the lower surface of the second cross member 35, the support rigidity of the link pivot 61 in the protrusion 62 is increased, and the rigidity of the protrusion 62 can be easily secured.
[0038]
FIG. 5 shows another embodiment in which the rear swing arm is in another form. In this example, the rear swing arm 80 is a cantilever type, includes left and right arm portions 81 and 82, a bent portion 83 that crosses the front of the rear wheel 18 by bending the base side of the one arm portion 81 to the other side. The curved portion 83 is connected to the body portion 84 extending rearward from the other arm portion 82, whereby the rear wheel 18 is cantilevered by the body portion 84 from one side. In addition, a space 85 is formed between the left and right arm portions 81 and 82 in front of the bending portion 83, and the rear cushion 25 is disposed in the space 85 in the vertical direction.
[0039]
Structures other than the rear swing arm 80 are the same as those in FIG. 3, and hereinafter, common portions are denoted by common reference numerals, and redundant description is omitted except for some portions. The upper end support structure of the rear cushion 25 in the present embodiment is the same as that in the previous embodiment, and a pair of left and right cushions are interposed between the first cross member 34 and the curved portion 83 that are spanned between the left and right arm portions 81 and 82. A bracket 37 is provided. In this way, the upper end of the rear cushion 25 is supported by the cushion bracket 37 provided at the front end of the cantilevered rear swing arm 80, which is easy to obtain rigidity, so that the support portion becomes highly rigid. Therefore, if the support rigidity is the same, the size and weight can be further reduced and the cost can be reduced.
[0040]
In addition, this invention is not limited to the said Example, A various deformation | transformation and application are possible, for example, a cushion bracket can also be integrally formed by forge.
[Brief description of the drawings]
1 is a side view of a motorcycle according to an embodiment. FIG. 2 is a side view of a rear suspension. FIG. 3 is a plan view of the same. FIG. 4 is a cross-sectional view of connecting points of a link mechanism. FIG. 3 is a view similar to FIG. 3 according to another embodiment.
1: Front wheel, 3: Head pipe, 5: Main frame, 6: Engine, 18: Rear wheel, 23: Pivot shaft, 24: Rear swing arm, 25: Rear cushion, 33: Arm part, 34: First cross Member, 35: second cross member, 37: cushion bracket, 80: cantilevered rear swing arm

Claims (3)

A rear swing arm whose front end is swingably supported on the vehicle body side via a pivot shaft and which supports a rear wheel at the rear end, a cushion bracket provided on the front end side of the rear swing arm, and a front end of the rear swing arm In a rear suspension comprising a link that connects the lower side to the vehicle body side, and a rear cushion that supports the link and the cushion bracket up and down,
The rear swing arm includes a pair of left and right arm portions, and the front end sides of the left and right arm portions are connected by first and second cross members provided at intervals in the front and rear.
The cushion bracket is also provided in a pair on the left and right sides, and the front and rear ends thereof are connected to the first and second cross members,
The first cross member is supported between the left and right arm portions separated from each other and supported by upper portions of left and right projecting portions provided at the respective tip portions supporting the pivot shaft. Arranged above the pivot shaft so as to be disposed above the arm portion and partially overlap the pivot shaft in plan view;
Each of the left and right cushion brackets is located inside the left and right arm portions and extends in the front-rear direction beyond the upper portion of the rear cushion in a side view, and the upper portion of the rear cushion is interposed between each middle portion in the front-rear direction. Rear cushion mounting structure characterized by supporting.   2. The rear cushion mounting structure according to claim 1, wherein the left and right cushion brackets are provided with bosses projecting inwardly, and upper and left sides of the rear cushion are supported by these bosses.   The rear cushion is supported at an upper portion between the left and right cushion brackets and includes a sub cylinder. The sub cylinder passes through a space surrounded by the left and right cushion brackets and the front and rear first and second cross members. The rear cushion mounting structure according to claim 2, wherein the rear cushion mounting structure is arranged.

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