JPH0573632B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steering device particularly suitable for a motorcycle having a long overall vehicle length and a large distance between a steering shaft tube and a passenger seat.

Conventionally, this type of motorcycle is publicly known (for example, USP 3,123,456), but the steering handle must be extended rearward from the front steering shaft tube for the rider riding at the rear, and when turning, the left and right grips must be extended. When both the steering wheel and the steering wheel are operated in the opposite direction to the turning direction, the stability of the steering or the lightness of the steering wheel operation may be deteriorated.

In order to eliminate the above-mentioned problems, the inventor added a second bracket to the vehicle body frame located between the steering shaft tube and the passenger's seat, in addition to the conventional bracket supported by the steering shaft tube. A prototype was manufactured in which the second bracket was rotatably provided, the second bracket was connected to the conventional bracket by a pair of push-pull rods, and a steering handle was attached to the second bracket. This is without the above-mentioned problems.
The relationship between the amount of operation of the steering wheel and the turning angle is not easy to set due to personal preferences.

This invention is characterized in that the relationship between the amount of operation of the steering handle and the turning angle can be adjusted by adjusting the connection position between the rotation centers of the first and second brackets and the pair of push/pull rods. There is.

The present invention will be explained below with reference to illustrated embodiments. 1 is the body frame of a motorcycle, which is made by welding and assembling steel pipes. The vehicle body frame 1 is the front steering shaft tube 2
A power unit 4 including an engine and a transmission is supported by a main column 3 extending rearward from there. As shown in FIG. 3, the main pillars 3 are made substantially symmetrical, and are reinforced by being connected to each other by cross members 3a which are vertically stacked and welded steel plates. and a main pillar front part 3b which is on the front side of the vehicle body from the connecting part of the cross member 3a in the main pillar 3;
A substantially triangular shape is formed with the cross member 3a. At the rear of the main pillar 3 is a seat support frame 5 and an auxiliary frame 6.
are welded together. Reference numeral 7 denotes a pair of upper and lower front brackets which are rotatably supported on the steering shaft tube 2, and support front wheels 9 through a pair of left and right front forks 8 so as to be rotatable. The upper member 7a of the front bracket 7 constitutes a first bracket to be described later. Reference numeral 10 denotes a rear arm supported at the rear of the vehicle body frame 1 so as to be vertically swingable, and has a rear wheel 11. The rear arm 10 and the vehicle body frame 1 are two links 1 rotatably supported by pivots at both ends.
2, 12, two links 12,
A spring means 13 whose other end is connected to the seat support frame 5 is rotatably connected to the connecting portion 12, and thus the rear wheel 11 is supported by the vehicle body frame 1 in a cushioning manner. Reference numeral 14 denotes a second bracket, which is rotatably supported by a bearing sleeve 15 having substantially the same structure as the steering shaft tube 2 described above. Since the bearing sleeve 15 requires high strength, it is provided to penetrate the cross member 3a, and its periphery is welded to the steel plate constituting the cross member 3a. 16 is a steering handle fixed to the second bracket 14 by bolts 17a, 17a via presser feet 17, 17;
6 is formed into a rod shape that extends continuously in the vehicle width direction. 18 is a radiator for water cooling the engine.

The first bracket 7a for turning the front wheel 9
and the second bracket 14 are connected by a pair of push-pull rods 21. That is, the push-pull rod 21 includes a bolt-shaped end fitting 22, and the end fitting 22 has a left-hand thread and a right-hand thread, and is connected by a nut-like member 23 to form a so-called turnbuckle. There is. A pin 24 connects the push-pull rod 21 to each bracket 7a, 14, and is formed integrally with the end fitting 22. Each bracket 7a, 14 has a steering shaft tube 2.
A pin hole 26 is provided symmetrically with respect to a plane C including the axis of the bearing sleeve 15, and the pin 24 is loosely engaged with the pin hole 26.
It is prevented from coming off with a circlip 24a. That is, the first bracket 7a and the push/pull rod 21 are connected by a pin 24. On the other hand, the second bracket 14 is provided with three pin holes 26, 26 for changing the rod connection position symmetrically with respect to the surface C, and the distances from the bearing sleeve 15 are changed, respectively. One of the rods 21 is selected and connected by a pin 24.

Further, the plurality of pin holes 26 provided in the second bracket 14 are arranged in the vehicle width direction at a portion near the steering handle 16, and the pin holes 26 located closest to the center of rotation of the second bracket 14 are arranged in the vehicle width direction. The arrangement positions of the hole 26 and the pin hole 26 of the first bracket 7a are such that when the push-pull rods 21 are connected to these, the push-pull rods 21 are relatively close to each other as shown in FIG. They are positioned so that they are approximately parallel.

Next, the operation of the embodiment will be explained. In FIG. 2, when the steering handle 16 is turned to the left, the second bracket 14 is rotated counterclockwise.
The right push/pull rod 21 connected to this pushes the right side of the first bracket 7a, and the left push/pull rod 21 pulls the left side of the first bracket 7a, thus rotating the first bracket 7a counterclockwise. Then, the front wheels 9 are turned to the left to turn the vehicle to the left. When turning the vehicle to the right, the operation is completely opposite to the above.

Next, a method of adjusting the relationship between the amount of operation of the steering wheel and the turning angle in this embodiment will be explained. First, remove the circlip 24a on the second bracket 14 side, remove the pin 24 from the pin hole 26, fit it into the other adjacent pin hole 26, fix it again with the circlip 24a, test drive the vehicle, and check the condition. The desired characteristics are obtained by sequentially changing to other pin holes 26. The reason why the push-pull rod 21 is formed into a turnbuckle shape is to eliminate errors in each part and facilitate assembly.

As described above, the present invention provides a push-pull rod that connects the first bracket and the second bracket by providing a plurality of pin holes at different distances from the rotation center of the second bracket in the second bracket having the steering handle. is rotatably connected to the pin hole, so the distance of the push-pull rod from the center of rotation of the second bracket can be adjusted, and the relationship between the amount of operation of the steering handle and the turning angle can be freely adjusted. . Also, since the push-pull rod and bracket are connected using pins and pin holes, adjustment is a little difficult.The connection is secure, and the adjustment does not go awry or come off during use, making it highly reliable. There are other effects.
Furthermore, the front part of the main pillar and the cross member form a substantially triangular shape, and the pin holes are arranged in the vehicle width direction in the second bracket located on the cross member, so the push and pull rods can be arranged in a position other than parallel. Then, when the vehicle body is moving straight, the push-pull rod will be inclined so as to substantially follow the front part of the main pillar on the same side. Therefore, there is an advantage that the presence of the push-pull rod does not feel strange. Further, when both push and pull rods are made parallel to each other, they are arranged close to the approximate center in the vehicle width direction, resulting in a simple appearance. When configured as described above, the push-pull rods can be centrally arranged near the front of the main pillar, and the installation space can be minimized.

Furthermore, the front fork is supported by a pair of upper and lower front brackets, and the first bracket located on the upper side of the front brackets is not provided with a pin hole for changing the rod connection position, and the second bracket, which requires relatively less strength, is not provided with a pin hole for changing the rod connection position. Since the bracket is provided with a pin hole for changing the rod connection position, there is no possibility that the first bracket will lack strength. Therefore, the front fork can be firmly supported by the front bracket. In addition, the shape of the second bracket only needs to be determined mainly by ensuring a space for providing a pin hole for changing the rod connection position, and there is no need to make it particularly thick. This has the advantage of increasing the degree of freedom in design.

In addition, in the steering device according to the present invention, a steering handle that extends continuously in the vehicle width direction is attached to the second bracket, and a pin hole for changing the rod connection position is provided in the steering handle near the steering handle. Since they are arranged side by side, the pin hole and the rear end of the push-pull rod are hardly noticeable.

Furthermore, since the front part of the main column and the cross member form a substantially triangular shape, the rigidity around the main column is increased. In particular, the frame around the main column from the steering shaft tube to the cross member becomes stronger.

[Brief explanation of the drawing]

The drawings show one embodiment of the invention,
Fig. 1 is a side view of the main parts of the motorcycle, Fig. 2 is a plan view of the main parts, Fig. 3 is a plan view of the main parts of the body frame, and Fig. 4 is a partially cutaway version equivalent to Fig. 2. It is an enlarged side view. 2... Steering shaft tube, 7a... First bracket, 1
4...Second bracket, 21...Push/pull rod.

Claims (1)

[Claims] 1 A pair of upper and lower front brackets that support the front wheels are rotatably supported on a steering shaft tube at the front end of the vehicle body frame via a pair of left and right front forks, and a pair of left and right brackets that extend rearward from the steering shaft tube are rotatably supported. A cross member with a bearing tube is installed on the main column of the main column, and the front part of the main column, which is on the front side of the vehicle body than the cross member connection part of the main column, and the cross member form a substantially triangular shape. A second bracket to which a rod-shaped steering handle that extends continuously in the direction is rotatably supported, and the first bracket located at the upper side of the front bracket and the second bracket are connected to the steering shaft. It is connected by a pair of push-pull rods that are arranged symmetrically with respect to the plane connecting the axis of the tube and the axis of the bushing and are formed in a straight line, and the push-pull rod and the second bracket The connecting structure is such that the end of each push-pull rod is pivotally supported in the pin hole of the second bracket via a pin,
A plurality of the pin holes are arranged in the vehicle width direction at different distances from the center of rotation of the second bracket at a portion of the second bracket near the steering handle, and the pin holes are arranged in the vehicle width direction at different distances from the rotation center of the second bracket. The location of the pin hole located on the rotation center side of the bracket and the push/pull rod connecting portion of the first bracket is such that when the push/pull rods are connected to these, the push/pull rods are relatively close to each other. A steering device for a motorcycle, characterized in that the steering device is positioned substantially parallel to each other.