JPH0241993A - Suspension device of motorcycle - Google Patents

Abstract

PURPOSE:To improve the rigidity of a suspension device of a motorcycle and to reduce the size and weight of the device by connecting the middle portion of a bell crank and a portion in the vicinity of the leading end of a swing arm by a rod in front of a rear cushion unit. CONSTITUTION:A bell crank 14 has the leading end mounted in such a manner as to freely turn on a fitting portion 6 disposed below a fitting portion 4. A rod hole 18 is bored in the middle portion of the bell crank. At the time of installing a rod 15, the rod hole 18 is arranged a little in front of a rear cushion unit 7, and the other end of the rod 15 is fixed to the rod hole 18 by a shaft. By this arrangement, the bell crank 14 and a swing arm 13 are connected by a short rod 15 so as to increase the intensity of the rod 15. Further, as the rear cushion unit 7 and the rod will not intersect each other, the volume of a through hole 10 and the rod 15 can be reduced so as to minimize the whole of that portion.

Description

[Detailed description of the invention] (Industrial application field) The present invention aims to increase the rigidity and reduce the size and weight.

The present invention relates to a suspension device for a motorcycle.

(Prior Art) A rear wheel suspension device for a motorcycle is constructed by interposing a rear cushion unit between a swing arm that supports a rear wheel at its rear end and a vehicle body frame. This rear cushion unit is sometimes directly connected between the swing arm and the vehicle body frame on both sides of the rear wheel, or recently there is a single unit that is indirectly connected via a bell crank. .

FIG. 4 shows an example of the latter rear wheel suspension device provided with a bell crank.

In this figure, l is a bell crank, and what is shown by the imaginary line 2 is the vehicle body frame. The body frame 2 has plate attachment parts 4, 5.6 protruding from each other.The attachment part 4 has the front end of the swing arm 3, the attachment part 5 has one end (upper end) of the carrier cushion unit 7, and the attachment part 5 has one end (upper end) of the swing arm 3, and the attachment part The front ends of the bell cranks 6 are rotatably attached to the bell cranks 6 and 6. As shown in the figure, the mounting part 5 is located above the mounting part 4, and the mounting part 4 is located above the mounting part 6. ing. The other end (lower end) of the rear cushion unit 7 is rotatably attached to the rear end of the bell crank l, and the bent part of the bell crank l is rotatably attached to one end of the rod 8. As shown, the bell crank 1 is disposed in front of the rear cushion unit 7.

The other end (upper end) of the rod 8 is rotatably attached to a mounting portion 9 projecting from the upper side of the intermediate portion of the swing arm 3.

This mounting portion 9 is disposed on the rear side of the rear cushion unit 7, that is, on the rear wheel (not shown) side.
is a relief hole bored in the swing arm 3, and by providing this relief hole 10, when the device is operated, the symbols 1,
Each member shown in 7.8 does not come into contact with the swing arm 3.

In the conventional rear wheel suspension device having the above configuration, the vibration of the rear wheel during driving is transmitted to the rear cushion unit 7 via the bell crank 1, and its buffering effect improves riding comfort and driving stability. (See Utility Model Application Publication No. 57-46089).

(Problem to be solved by the invention) However, in the above structure, the swing arm 3
The mounting portion 9 of is disposed on the rear side of the rear cushion unit 7, while the bell crank l is disposed on the front side of the rear cushion unit 7, so the rod 8 is arranged so as to intersect with the rear cushion unit 7. be combined. As a result, the rod 8 tends to become longer, the volume of the lot 8 increases, and the weight increases, resulting in an increase in vehicle weight and a problem of worsening fuel efficiency.

Further, although the swing arm 3, which is generally formed of pipe material, is provided with the relief hole 10 as described above, this relief hole 1O tends to be enlarged so as not to come into contact with the above-mentioned members 1, 7.8. Another problem that can be considered is that the rigidity and strength of the swing arm 3 are reduced due to a reduction in the volume of the swing arm 3.

The present invention has been made in view of this point, and provides a suspension device for a motorcycle that has a structure that shortens the length of the rod, increases rigidity, and further reduces the size and weight of this part. This is the problem to be solved.

(Means for Solving the Problems) As a means for solving the above-mentioned problems, the present invention provides a structure in which the front end of the swing arm 13 that supports the rear wheel at the rear end is pivoted to the vehicle body frame 2, and The front end of a bell crank 14 is pivoted to the other part, and a rear cushion unit 7 is interposed between the swing arm 13 and the vehicle body frame 2 via the bell crank 14.
The bell crank 14 is disposed below the swing arm 13, and the rear cushion unit 7 is interposed between the rear end of the bell crank 14 and the upper part of the vehicle body frame 2. The intermediate portion and a portion near the front end of the swing arm 13 are connected by a rod 15 disposed in front of the rear cushion unit 7.

(Function) Since the present invention is constructed as described above, the bell crank 14 and the swing arm 13 can be connected by the rod 15 over a distance as short as possible, thereby reducing the weight of the lot 15. Moreover, since the rear cushion unit 7 and the rod 15 do not intersect, smooth movement can be expected.

(Example) An example of the present invention will be described in detail below with reference to the drawings. In addition, the same reference numerals are given to the members common to those in Fig. 4,
The explanation will be omitted. FIG. 1 shows the main parts of a suspension device 11 for a motorcycle according to the present invention, and is an enlarged view of the part indicated by the solid line of the motorcycle 12 shown in FIG. 2. Reference numeral 11 denotes the above-mentioned mounting portions 4, 5.6 disposed on the vehicle body frame 2.
, the rear cushion unit 7 , the swing arm 13 rotatably attached to the mounting portion 4 , and the swing arm 1
3 and a rod 15. In addition, the rear cushion unit 7
is interposed between the rear end of the bell crank 14 and a mounting portion 5 disposed above the mounting portion 4 of the vehicle body frame 2.

A relief hole 10 is bored in the vicinity of the front end of the swing arm 13, and a rotation hole 16 is bored through the relief hole 10 and each opposing side surface of the swing arm 13. A rotation shaft 17 shown by a broken line in FIG. I'm wearing it. The rotation hole 16 is disposed in front of the rear cushion unit 7, that is, closer to the vehicle body frame 2 side. In addition, in FIG. 3, illustration of the attachment parts 4 and 5 is omitted.

The bell crank 14 has its front end rotatably pivoted to a mounting part 6 disposed below the mounting part 4, and a slot hole 18 is bored in the middle part of the bell crank 14. This rod hole 18 is placed closer to the front than the rear cushion unit 7 when the rod 15 is installed.

The other end of the rod 15 is rotatably attached to the rod hole 18 . In other words, rod 15 is bell crank 14
The intermediate portion of the swing arm 13 is connected to a portion near the front end of the swing arm 13, and is disposed in front of the rear cushion unit 7.

This suspension device 11 configured in this manner connects the bell crank 14 and the swing arm 13 with a short rod I.
5, the strength of the rod 15 can be increased. Furthermore, the rear cushion unit 7 and the rod 15 do not intersect when they are connected, so the volume of the relief hole 10 and the rod 15 can be reduced, and this makes it possible to downsize this part as a whole. can.

(Effect of the invention) Since the present invention is constructed as explained above,
It becomes possible to reduce the size of the escape hole and the rod, thereby making it possible to downsize the suspension device. Therefore, the rigidity and strength of the swing arm can be improved, and fuel efficiency can be improved by reducing the vehicle weight. Further, by downsizing the suspension device, not only can the installation space be reduced, but this part becomes easier to handle, and workability related to installation is improved.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the main parts of the suspension device for a motorcycle according to the present invention, FIG. 2 is a side view showing the suspension device in FIG. 1 attached to a motorcycle, and FIG. FIG. 4 is a perspective view showing a suspension device for a conventional motorcycle, and FIG. 4 is a side view showing main parts of a conventional suspension device for a motorcycle. 2...Vehicle frame 7...Rear cushion unit 11...Suspension device 13...Swing arm 14--Bell crank 15-...Rod Fig. 1 Fig. 2

Claims (1)

[Claims] (1) The front end of the swing arm that supports the rear wheel at the rear end is pivoted to the vehicle body frame, and the front end of a bell crank is pivoted to the other part of the vehicle body frame, and the swing arm and the vehicle body are connected to each other via the bell crank. In the motorcycle in which a rear cushion unit is interposed between the bell crank and the frame, the bell crank is disposed at the lower part of the swing arm, and the rear cushion unit is disposed between the rear end of the bell crank and an upper part of the vehicle body frame. 1. A suspension device for a motorcycle, characterized in that an intermediate portion of a bell crank and a portion near the front end of a swing arm are connected by a rod disposed in front of a rear cushion unit.