JP4117099B2 - Pivot structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pivot structure, and more particularly to a pivot structure suitably used for a cushion mechanism interposed between a swing arm of a motorcycle and a vehicle body frame.
[0002]
[Prior art]
Conventionally, a cushion mechanism is provided between a swing arm and a body frame of a motorcycle.
This cushion mechanism has a configuration in which a vehicle body frame and a swing arm are connected by a plurality of link pieces, and a cushion is attached between one of the link pieces and the vehicle body frame.
And the connecting part of the link pieces constituting such a cushion mechanism, the connecting part of the link piece and the vehicle body frame and the swing arm, and the connecting part of the cushion and the vehicle body frame and the link piece are It is made into the pivot structure which connects these so that relative rotation is possible.
[0003]
In this pivot structure, through-holes along the opposing direction are formed coaxially in each of a pair of support members arranged in opposition, a collar is inserted between these support members, and the one support member A fastening bolt is inserted from the through hole into the through hole of the other support member through the collar, the outer periphery of the head of the fastening bolt is brought into contact with the inner periphery of the through hole of the one support member, and the fastening bolt The front end protrudes to the outside of the other support member, and a nut is screwed onto the front end of the fastening bolt, and is pressed against the outside of the other support member, thereby fixing the fastening bolt to both support members. And the structure which hold | maintains the said collar | collar between both support members is known.
[0004]
Other members are attached to the collar, and the collar is rotatably supported through the collar.
[0005]
[Problems to be solved by the invention]
By the way, in such a conventional pivot structure, when a radial force is applied to the collar, a bending force is applied to the fastening bolt that supports the collar, and the outer peripheral surface of the fastening bolt is formed on the support member. It may be made to contact | abut at the corner | angular part inside a through-hole.
[0006]
In order to avoid such contact between the fastening bolt and the support member, it has been considered to chamfer the inner peripheral edge of the through hole formed in the support member.
However, since the inner peripheral edge to be chamfered is positioned on the opposite surface side of both support members, there is a problem that it is difficult to install a tool or jig for chamfering.
[0007]
The present invention has been made in view of such conventional problems, and avoids interference with the inner peripheral edge of the through hole of the support member through which the fastening bolt is passed when a bending force is applied to the fastening bolt. It is an object of the present invention to provide a pivot structure capable of easily obtaining the structure.
[0008]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the pivot structure according to claim 1 of the present invention has a through-hole along the opposing direction formed coaxially in each of the pair of opposingly arranged support members. A collar is inserted between the support members, and a fastening bolt is inserted from the through hole of the one support member through the collar to the through hole of the other support member. The head of the fastening bolt and the other support member The collar is fixed to the other support member by being sandwiched between the inner surface and the head side of the fastening bolt has an inner diameter equivalent to the outer diameter of the head of the fastening bolt. A pivot structure configured by supporting the inner periphery of a through hole formed in the one support member, the head of the fastening bolt positioned from the through hole to the inside of the one support member Outer circumference A small diameter portion is formed over the entire circumference, the collar is sandwiched between the inner surface of the small diameter portion and the inner surface of the other support member, and a gap is formed between the collar and the inner surface of the one support member. It is provided .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a motorcycle as a vehicle to which an embodiment of the pivot structure of the present invention is applied.
The vehicle 1 includes a body frame 2, a front fork 3 attached to the front end portion of the body frame 2, a front wheel 4 rotatably attached to a lower end portion of the front fork 3, and an upper end of the front fork 3. A steering handle 5 mounted on the front part, a horizontally opposed engine 6 suspended below the front fork 3 below the front part of the body frame 2, and swinging up and down behind the lower part of the body frame 2 A swing arm 7 (see FIG. 2) that can be mounted, a rear wheel 8 that is rotatably mounted on the swinging end of the swing arm 7, and a fuel tank that is mounted above the front of the vehicle body frame 2 9, a seat 10 mounted on the rear side of the fuel tank 9 in the body frame 2, a front upper portion of the front fork 3, and the fuel tank 9 and the body frame A front cowl 11 provided so as to cover both sides of the vehicle 2 and, as shown in FIG. 2, at both sides of the body frame 2 (only the left side is shown in the illustrated example) A radiator 12 that cools the horizontally opposed engine 6 is mounted at a position above the horizontally opposed engine 6.
[0010]
Next, these details will be described. As shown in FIG. 2, the vehicle body frame 2 includes a head pipe portion 13 to which the front fork 3 is rotatably mounted, and the swing arm 7 is swingable. A pair of left and right swing arm pivot portions 14 to be mounted, and a pair of left and right tank rail portions 15 that connect these swing arm pivot portions 14 and the head pipe portion 13 are configured.
[0011]
The swing arm pivot portion 14 is positioned below the head pipe portion 13 and is positioned behind the horizontally opposed engine 6, and the horizontally opposed engine 6 is connected to the lower end portion thereof. A bracket portion 16 extends forward.
[0012]
Each tank rail portion 15 is provided so as to be inclined rearwardly with respect to the horizontal plane, and a bracket 17 to which the horizontally opposed engine 6 is connected is provided at a lower portion of the intermediate position. ing.
[0013]
Further, a pair of left and right brackets 18 extending from the lower end portion of the head pipe portion 13 toward the upper portion of the front end of the horizontally opposed engine 6 positioned at the lower rear portion are connected to the horizontally opposed engine 6. Has been.
[0014]
On the other hand, a cushion mechanism 19 that controls the swing of the swing arm 7 is provided between the swing arm 7 and the swing arm pivot portion 14.
[0015]
The cushion mechanism 19 includes a link mechanism 20 provided between a lower end portion of the swing arm pivot portion 14 and a lower portion of the swing arm 7 in the length direction, the link mechanism 20, and the swing arm. The rear cushion 21 is interposed between the upper end of the pivot portion 14 and the rear cushion 21.
[0016]
The radiator 12 is disposed along the front-rear direction of the vehicle body, and is fixed to the tank rail portion 15 with bolts 40 at the upper end portion thereof, and is fixed to the bracket 18 with bolts 41 at the lower end portion thereof. Thus, the vehicle body frame 2 is mounted.
In addition, these radiators 12 are provided with an electric fan 22 for forcibly guiding cooling air to the radiator 12. By sucking air that has entered the inside of the vehicle body from the front of the vehicle body, the air is absorbed. Then, after passing through each radiator 12, it is discharged to the side of the vehicle body.
[0017]
Further, a number of exhaust pipes 23 are connected to the lower part of the horizontally opposed engine 6.
[0018]
Further, both side portions of the front cowl 11 are positioned so as to cover the radiators 12, exhaust portions 27 are provided in portions facing the radiators 12, and the electric fan 22. Thus, the air passed through each radiator 12 is discharged to the outside of the vehicle body through the exhaust port 27.
[0019]
Further, in FIG. 1, reference numeral 28 denotes a muffler connected to each exhaust pipe 23, and reference numerals 29 and 30 denote baggage boxes.
[0020]
As will be described in detail in FIG. 3, the link mechanism 20 constituting the cushion mechanism 19 has a first end rotatably connected to the upper portion of the swing arm 7 via a first pivot portion P1. The link piece 50 is constituted by a second link piece 51 that rotatably connects the first link piece 50 to the vehicle body frame 2 at an intermediate portion thereof, and one end portion of the second link piece 51 is the vehicle body frame. 2 is pivotally connected to the second link 51 via the second pivot portion P2, and the other end of the second link 51 is connected to the third pivot portion P3 at a substantially middle portion in the length direction of the first link piece 50. It is the structure connected through rotation via.
The lower end of the rear cushion 21 is rotatably connected to the other end of the first link piece 50.
[0021]
The pivot structure according to this embodiment is applied to the first pivot portion P1.
The first pivot portion P1 includes a pair of support members 55 and 56 projecting from the upper portion of the swing arm 7, and through holes 57 extending in the facing direction are provided in the support members 55 and 56, respectively. 58 is formed on the same axis, and a collar 59 is inserted between the support members 55 and 56, and a through hole of the other support member 56 is passed from the through hole 57 of the one support member 55 through the collar 59. A fastening bolt 60 is inserted into 58, and the collar 59 is fixed to the other support member 56 by the fastening bolt 60, and the head 60 a side of the fastening bolt 60 is supported by the through hole 57 of the one support member 55. As shown in detail in FIG. 4, the small-diameter portion 60 b is entirely formed on the outer peripheral portion positioned near the inner surface of the one support member 55 by the head portion 60 a of the fastening bolt 60. Formed was been constructed over, it has been the pivot structure as a whole.
[0022]
The through hole 58 formed in the other support member 56 has an inner diameter substantially equal to the outer diameter of the fastening bolt 60, and the inner diameter of the through hole 57 formed in the one support member 55. However, the outer diameter of the head 60a of the fastening bolt 60 is substantially the same.
[0023]
The inner diameter of the collar 59 is substantially the same as the outer diameter of the fastening bolt 60, and the outer diameter of the collar 59 is larger than the inner diameter of the through hole 58 formed in the other support member 56. Has been.
[0024]
Accordingly, the fastening bolt 60 is inserted from the through hole 57 of one support member 55 in a state where the collar 59 is positioned between the support members 55 and 56 and coaxially with the respective through holes 57 and 58. The collar 59 is held by inserting the tip of the tip through the through hole 58 of the other support member 56, and the nut 61 is screwed onto the tip of the fastening bolt 60 from the outside of the other support member 56. As a result, the collar 59 is clamped and fixed between the head 60 a of the fastening bolt 60 and the inner surface of the other support member 56.
[0025]
The first link piece 50 is pivotally connected to the collar 59 via a radial bearing 62. As the swing arm 7 swings, the head 60a of the fastening bolt 60 is An action of pressing against the inner wall surface of the through hole 57 of one support member 55 is generated, whereby a bending force acts on the fastening bolt 60. The head 60a of the fastening bolt 60 causes the one support member to move. Since the small-diameter portion 60b is formed over the entire circumference in the outer peripheral portion located in the vicinity of the inner surface of 55, interference between the head portion 60a and the inner peripheral edge inside the through hole 57 is avoided.
[0026]
And since the small diameter part 60b of the said fastening bolt 60 is performed by the outer surface process with respect to the head 60a of the fastening bolt 60, the process is simple and does not require a special tool and jig | tool, Therefore, the above-described function can be obtained while minimizing the cost increase.
[0027]
Note that the shapes, dimensions, and the like of the constituent members shown in the above embodiment are merely examples, and various changes can be made based on design requirements and the like.
For example, although the example in which the pivot structure of the present embodiment is applied to the connecting portion between the first link piece 50 and the swing arm 7 has been shown, the connecting portion between the second link piece 51 and the vehicle body frame 2 or the rear cushion 21. It can be applied to the connecting portion between the vehicle body frame 2 and the other pivot portion.
[0028]
【The invention's effect】
As described above, according to the pivot structure according to the present invention, even when a bending force is applied to the fastening bolt, a small diameter is provided on the outer peripheral portion of the fastening bolt that is positioned in the vicinity of the inner side surface of one support member. Since the part is formed over the entire circumference, interference between the fastening bolt and the inner peripheral edge of the support member is avoided.
And since the small diameter part of the said fastening bolt is performed by the outer surface process with respect to a fastening bolt, the process is simple and does not require a special tool and jig | tool, Therefore, the rise in cost is minimized. The above-described functions can be obtained while limiting to the limit.
[Brief description of the drawings]
FIG. 1 is a side view showing a motorcycle as a vehicle to which an embodiment of the present invention is applied.
FIG. 2, showing an embodiment of the present invention, is a side view around a vehicle body frame.
FIG. 3 is a transverse cross-sectional view showing a link mechanism interposed between a swing arm and a vehicle body frame, with a part thereof omitted, showing an embodiment of the present invention.
FIG. 4 is an enlarged vertical sectional view of a main part showing an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vehicle 2 Body frame 3 Front fork 4 Front wheel 5 Steering handle 6 Horizontally opposed engine 7 Swing arm 8 Rear wheel 9 Fuel tank 10 Seat 11 Front cowl 12 Radiator 13 Head pipe portion 14 Swing arm pivot portion 15 Tank rail portion 16 Bracket portion 17 Bracket 18 Bracket 19 Cushion mechanism 20 Link mechanism 21 Rear cushion 22 Electric fan 23 Exhaust pipe 27 Exhaust port 28 Muffler 29 Baggage box 30 Baggage box 40 Bolt 41 Bolt 50 First link piece 51 Second link piece 55 Support member 56 Support member 57 Through hole 58 Through hole 59 Collar 60 Fastening bolt 60a Head 60b Small diameter part 61 Nut 62 Radial bearing P1 First pivot part P2 Second pivot part P3 Third pivot part

Claims (1)

A through-hole along the opposing direction is formed coaxially in each of the pair of support members arranged opposite to each other, and a collar is inserted between these support members, and the collar is inserted from the through-hole of the one support member. Then, a fastening bolt is inserted into the through hole of the other support member, and the collar is fixed to the other support member by clamping between the head of the fastening bolt and the inner surface of the other support member. And the head side of the fastening bolt has an inner diameter equivalent to the outer diameter of the head of the fastening bolt and is supported by the inner periphery of the through hole formed in the one support member. A pivot structure , wherein a small-diameter portion is formed over the entire outer periphery of the head of the fastening bolt positioned from the through hole to the inside of the one support member, and the inner surface of the small-diameter portion and the other Supporting part Pivot structure of sandwiching the collar with the inner surface, characterized in that a gap between the collar and the inner surface of the one support member.

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