JPH0930476A - Link for suspension of motorcycle or the like and manufacture of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suspension link excellent in precision and functional property with simple minimum working by providing a hole connected to the car body side and rear swing side and a hole connected to a buffer having the same dimension widthwise of an autocycle. SOLUTION: An extruded material 40 to provide a link is a long aluminum material formed by extrusion molding method such that the aluminum material with approximately triangular cross section is provided inside the proximity of each apex of the triangle longitudinally with first, second and thirs holes 44, 45 and 46 and in the intermediate part with a lightening part 4 to lighten itself. This extruded material 40 is cut off to the uniform width same as the width of an autocycle longitudinally. Since the extruded material 40 is cut off to the predetermined width, the obtained link has accurate precision in the width dimension W and the desired precision of the inner diameter dimension is obtained in the respective holes 44, 45 and 46. Further, the respective holes 44, 45 and 46 are connecting holes of a rear swing arm through a car body, hydraulic buffer and tension rod.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension link which is interposed between a vehicle body side of a motorcycle or the like and a rear swing arm side and which is also connected to a shock absorber, and a method for manufacturing the link. .

[0002]

2. Description of the Related Art Japanese Patent Publication No. 6-53508 has been disclosed as a suspension link for a motorcycle. The technology described in this publication relates to a rear wheel suspension system of a motorcycle. In this technology, the suspension link is shown in FIG.
And disclosed in FIG.

This suspension link, which is described as a relay arm, is a curved L type whose side view is loose, and has its front end pivotally attached to the vehicle body and its rear part formed into a bifurcated shape as clearly shown in FIG. ,
During this time, the lower end of the hydraulic shock absorber is pivotally connected and connected. The intermediate portion of the relay arm is pivotally connected to the rear swing arm by a link called a tension rod. As described above, a suspension link called a relay arm is formed.

[0004]

Since the above-mentioned conventional suspension link has the bifurcated connecting portion at the rear portion, the link has to be manufactured by forging, cutting, and punching. That is, when manufacturing a link by forging, in addition to forging,
Machining, mounting holes on the vehicle body, mounting holes for shock absorbers, and drilling holes for the tension rod are essential.

Therefore, the manufacturing of the suspension link requires a lot of man-hours, the manufacturing is troublesome and complicated, and the manufacturing cost of the link is inevitably high. As a result, the cost of parts is increased, which goes against the demand for cost reduction of motorcycles and the like.

The present invention has been made to solve the above problems. The inventors of the present invention need to provide the above-mentioned suspension link with a vehicle body side mounting hole, a rear swing arm side mounting hole, and a shock absorber mounting hole, if necessary. The present invention has been made by focusing on the fact that the functionality is excellent, the desire to easily obtain a suspension link, and the accuracy of extruded materials such as aluminum materials are excellent. .

Therefore, the object of the present invention is to eliminate mechanical processing such as forging, cutting, and drilling, which have been indispensable in the past.
Suspension link for motorcycles, etc., which enables to obtain a suspension link that is simple, requires minimal processing, is highly accurate, and has excellent functionality while meeting the demand for cost reduction, and this link. It is to provide a manufacturing method of.

[0008]

According to a first aspect of the present invention, a means for solving the above problems is provided between a vehicle body side of a motorcycle or the like and a rear swing arm side, and one end portion of a shock absorber. In a suspension link for a motorcycle or the like that is also connected to a vehicle, the link has the same dimension in the vehicle width direction and includes a connection hole to the vehicle body side, a connection hole to the rear swing arm side, and a shock absorber connection hole. It is a suspension link for motorcycles and the like.

According to a second aspect of the present invention, the link has an intermediate portion,
A thinned portion penetrating in the thickness direction is provided.

According to a third aspect of the present invention, a suspension link for a motorcycle or the like, which is interposed between a vehicle body side of a motorcycle or the like and a rear swing arm side, and which is also connected to one end of a shock absorber, is connected to the vehicle body side. The step of molding the member having the connection hole, the connection hole to the rear swing arm side, and the shock absorber connection hole with an extruded material such as an aluminum material, and the extruded material such as the aluminum material are orthogonal to the length direction. Direction, a method for manufacturing a suspension link for a motorcycle or the like, which comprises a cutting step of cutting a predetermined thickness.

According to a fourth aspect of the present invention, the extruded material such as the aluminum material is a method of manufacturing a suspension link for a motorcycle or the like in which a lightening hole is formed separately from the holes.

According to the third and fourth aspects, the vehicle body side connecting hole, the rear swing arm side connecting hole, the shock absorber connecting hole,
And an extruded material such as an aluminum material having a lightening portion,
The suspension link can be obtained by simply cutting it to a predetermined width.

[0013]

1 is an external side view showing an example of a motorcycle to which the present invention is applied, FIG. 2 is an enlarged side view of a suspension link portion, and FIG. 3 is a line 3-3 of FIG. FIG. 4 is a plan view of the suspension link single body, FIG. 5 is a side view of the suspension link single body, FIG. 6 is an extruded material, and an explanatory perspective view showing a process of obtaining the suspension link single body. Is.

In FIG. 1, reference numeral 1 denotes a motorcycle, and in this example, a motocross type motorcycle for off-road use. In this example, the body frame 2 is of a cradle type, and a front tube 4a is steerably supported by a head tube 2a at a front end thereof via a front fork 3 and is mounted on a top bridge 3a at an upper end portion of the front fork 3. Attach the handle 5. An engine 6 is mounted and arranged on the down tube lower 2b of the vehicle body frame 2, and a fuel tank 7 is arranged on a main frame 2c which is an upper member of the vehicle body frame 2.

A rear stay 2d is provided behind the main frame 2c and extends from the rear half of the fuel tank 7 to the rear stay 2.
Place the sheet 8 on d. The center frame 2e is hung downward from the rear end of the main frame 2c, and the lower end of the center frame 2e and the down tube lower 2b are provided.
The rear end portion is connected to form a cradle type vehicle body frame 2. A rear portion of the middle lower portion of the center frame 2e and a lower portion of the rear portion of the rear stay 2d are connected by a substay 2g. In FIG. 1, 8 is a vaporizer constituting a fuel supply device, 9 is a cone tube, and 10 is an air cleaner. 1
Reference numeral 1 is an exhaust pipe silencer, 12 is a front fender, and 13 is a rear fender.

At the lower part of the center frame 2e, the rear wheel 1
A rear swing arm 15 (hereinafter referred to as a swing arm) that supports 4 is swingably supported. The swing arm 15 has a mounting boss 15a at the front end pivotally attached to a lower portion of the center frame 2e by a support shaft 16 and swings about the support shaft 16 as a fulcrum. On the lower front part of the swing arm 15,
The support bracket 17 is suspended and fixed, and the rear wheel 14 is coaxially provided with a driven sprocket 18 on one side. The driven sprocket 18 is attached to a drive sprocket 19 arranged on the side of the mission case 6a of the engine 6. Connect via 20. In FIG. 1, reference numeral 21 denotes a disc break caliper, which is a disc break caliper 2 of the front wheel 4.
2 is provided at the lower end of the front fork 3.

FIG. 2 is a suspension link 30 according to the present invention.
FIG. 3 is an enlarged side view showing a state in which is connected to a center frame 2e of the vehicle body 2, a shock absorber, and a swing arm 15. 4 and 5 show the suspension link 30 alone, and FIG. 6 shows the extruded material 40 from which the suspension link 30 is obtained.

The extruded material 40 is a long material formed by extruding an aluminum material made of aluminum or an aluminum alloy into a shape as shown in FIG. The arrow a in FIG. 6 indicates the extrusion molding direction of the extruded material.

The above extruded material 40 is molded in the extrusion molding process so as to have a substantially inverted triangular cross section as shown in FIGS. 6 and 5, and the upper side portion 41 is curved downward at the middle portion to form a concave shape. The other two sides 42 and 43 are also set to have a cross-sectional shape such that each intermediate portion is curved in a concave shape toward the central portion. In the extrusion molding process, the extruded material 40 has a first hole 44, a second hole 45, and a third hole 46 which are opened in the longitudinal direction inside the vicinity of the tops of the triangle, and the weight is reduced in the middle part. For meat removal 4
Open 7.

In the cutting step, the above extruded material 40 is cut to a predetermined size W in the length direction, and the cutting width W is the same as the width direction of the motorcycle, and cut into a uniform and equal width. As described above, the suspension link 30 as shown in FIGS. 4 and 5 is obtained. By the way, since the extruded material 40 is cut into a predetermined width W, the obtained link 30 has an accurate width dimension W, and the inner diameters of the holes 44, 45, 46 have desired accuracy. You can get

The obtained link 30 has a uniform W in the vehicle width direction, is a substantially inverted triangle in side view as shown in FIG. 5, and has an upper side 3
In No. 1, the middle portion is curved in a concave shape, and the other two sides 32 and 33 are also curved in a concave shape toward the central portion, and a lightening portion 37 is provided in the central portion. Inside the vicinity of each apex, a first hole 34 is formed from the left side of FIG. 5, a second hole 35 is formed on the right side, and a third hole 36 is formed on the lower side.

The suspension link 30 connects the vehicle body 2, the swing arm 15, and the shock absorber 24. By the way, as shown in FIG. 3, the center frame 2e of the vehicle body 2 stands upright to the left and right on the cross member 2g.
Bifurcated brackets 23, 23 are erected upward and rearward at the rear part of the intermediate part of the front part 30a of the link 30.
The bush 52 is inserted into the first hole 34 through the bearing 51, the bolt 53 is further inserted into the bush 52 and the holes 23a of the brackets 23, 23, and the nut 30 is used to pivot the front portion 30a of the link 30 toward the vehicle body. To wear.

A hydraulic shock absorber 24 is provided on both sides of the second hole 35.
The bush 56 is passed through the second hole 35 via the bearing 55 in the same manner as described above so as to sandwich the bifurcated mounting pieces 24a, 24a provided at the lower end of the. Attach the bolt 57 to the bifurcated mounting pieces 24a, 24a at the lower end of the hydraulic shock absorber 24.
Through the hole 24b provided on one side and the bush 56, and the screw hole 24c provided on the other side of the mounting piece 24a, and screwed.
The lower end of the hydraulic shock absorber 24 is pivotally attached to the rear portion 30b of the link 30.

An upper end 24d of the hydraulic shock absorber 24 is pivotally attached to a bracket 2h extending rearward from a rear end of the main frame 2c constituting the vehicle body by a shaft 24e. Link 30
On both sides of the lower part 30c of the plate, the plate-like tension rods 58, 58 are sandwiched between the front parts 58a of the plate-shaped tension rods 58, and the bushes 60 are inserted into the third holes 36 via the bearings 59.

Holes 58b and 58b are provided in front of the tension rods 58 and 58, and the holes 58b, the bush 60, and the hole 5 are provided.
The bolt 61 is passed through 8b, the nut 62 is screwed, and the front portions 58a of the tension rods 58, 58 are pivotally attached via the lower hole 30c third hole 36 of the link 30.

Rear portion 58c of the tension rods 58, 58
Holds the bracket 17 that hangs from the middle front part of the swing arm 15. The bracket 17 has a hole 1 in the vehicle width direction.
7a, and the bearing 63 and the bush 6 in the hole 17a.
4 inside, tension rod 58, rear part 58c of 58
Holes 58d are provided in each of the holes 58d, the bush 64, and the hole 5
The bolt 65 is passed through 8d, the nut 66 is screwed, and the rear portions 58c of the tension rods 58, 58 are pivotally attached to the bracket 17 of the swing arm 15. 67 in FIG. 3 is
It is a sealing material fitted on the outside of each bearing.

As described above, the link 30 is pivotally connected and connected to the swing arm 15 side via the tension rod 58. By the way, in this example, the front end of the link 30 is pivotally connected to the vehicle body 2 and the rear end thereof is pivotally connected to each of the hydraulic shock absorbers 24, and the link 30 and the rear fork 15 are pivotally connected to each other by the tension rod 58. The rear end of the link 30 may be directly attached to the rear fork 15, the hydraulic shock absorber 24 may be connected to the link 30, and the front end of the link 30 and the vehicle body 2 side may be connected by a tension rod. .

By the way, the connection of the link 30 and the holes 34, 35, 36 for pivotal attachment are obtained by cutting the extruded material into a uniform predetermined width as described above, and the holes 34, 35, 36 are extruded. Since it is formed by molding and has the desired accuracy, it is possible to cut the extruded long material into a uniform width without the need to process the inner diameter of the hole, and use the holes formed during extrusion With the hole as it is, the bearing and bush are fitted, and the link 30 is inserted through the bolt that forms the shaft member.
The vehicle body side, the hydraulic shock absorber, and the rear fork side can be connected and pivotally attached.

The example shown in the above has been described in detail. In this example, the present invention was applied to an off-road type motorcycle.
The present invention can be applied not only to an on-road type motorcycle, but also to a three-wheeled vehicle having a rear wheel suspension mechanism forming a swing arm, and also to a four-wheeled vehicle having a rear wheel suspension mechanism forming a swing arm. Of course, the suspension link according to the present invention can be used.

[0030]

As apparent from the above, according to the present invention,
According to a first aspect of the present invention, there is provided a suspension link for a motorcycle or the like, which is interposed between a vehicle body side of the motorcycle or the like and a swing arm side, and which is also connected to one end of a shock absorber. Since the dimensions are the same, and the connecting hole to the vehicle body side, the connecting hole to the swing arm side, and the shock absorber connecting hole are provided, the extruded material such as aluminum material having each hole has a predetermined thickness, The suspension link can be obtained by cutting so as to have a uniform width.

Therefore, forging, cutting, drilling, etc. are not required at all, and the process is simple and inexpensive.
It is possible to obtain a suspension link that connects a vehicle body side, a swing arm side, and a shock absorber of a motorcycle or the like with excellent functionality. Also, since the extruded product of aluminum material is cut to obtain a suspension link by cutting it so that the width in the vehicle width direction becomes uniform,
It is possible to obtain the dimension of each part such as the dimension in the vehicle width direction with a predetermined accuracy, and it is possible to obtain a suspension link for a motorcycle or the like which is extremely advantageous in practical use, cost and manufacturing.

According to the second aspect, since the lightening portion penetrating in the thickness direction is provided in the middle portion of the link, the weight can be reduced even if the suspension link is a thick plate block.
The weight of the suspension link can be reduced while improving its functionality.

According to a third aspect of the present invention, the suspension link is formed of an extruded material such as an aluminum material by forming a member having a vehicle body side connecting hole, a swing arm side connecting hole, and a shock absorber connecting hole. This extruded material such as aluminum material is cut at a predetermined thickness in a direction orthogonal to the length direction to obtain a suspension link for a motorcycle or the like. It can be obtained at a low cost by a simple process without requiring any complicated process such as forging process, cutting process, and drilling process.

According to a fourth aspect of the present invention, in manufacturing the suspension link, an extruded material such as an aluminum material is formed by forming the lightening holes separately from the holes. The suspension link having the can be easily obtained only by the extrusion and cutting steps.

[Brief description of drawings]

FIG. 1 is an external side view showing an example of a motorcycle to which the present invention is applied.

FIG. 2 is an enlarged side view of a suspension link portion.

3 is a developed sectional view taken along line 3-3 of FIG.

FIG. 4 is a plan view of a suspension link unit.

FIG. 5 is a side view of the suspension link unit.

FIG. 6 is an explanatory perspective view showing a step of obtaining an extruded material and a suspension link simple substance from the extruded material.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Motorcycle, 2 ... Car body, 15 ... Rear swing arm, 24 ... Shock absorber, 30 ... Suspension link, 3
4, 35, 36 ... Holes, 37 ... Lightening portion, 40 ... Extruded material, 44, 45, 46 ... Hole, 47 ... Lightening portion

Claims (4)

[Claims] 1. A suspension link for a motorcycle or the like, which is interposed between a vehicle body side of the motorcycle or the like and a rear swing arm side and which is also connected to one end of a shock absorber, wherein the link is in a vehicle width direction. A suspension link for a motorcycle or the like having the same dimensions and having a vehicle body side connection hole, a rear swing arm side connection hole, and a shock absorber connection hole. 2. The suspension link for a motorcycle or the like according to claim 1, wherein the link has a lightening portion penetrating in a thickness direction in an intermediate portion. 3. A suspension link for a motorcycle or the like, which is interposed between a vehicle body side of a motorcycle or the like and a rear swing arm side, and which is also connected to one end of a shock absorber, a connecting hole to the vehicle body side, Connection hole to the rear swing arm side,
And a step of molding the member having the shock absorber connection hole formed therein with an extruded material such as an aluminum material, and a cutting step of cutting the extruded material such as the aluminum material with a predetermined thickness in a direction orthogonal to the length direction. A method for manufacturing a suspension link for a motorcycle or the like, which comprises: 4. The method of manufacturing a suspension link for a motorcycle or the like according to claim 3, wherein the extruded material such as the aluminum material has a lightening hole formed separately from each of the holes.