JPH01237279A - Device for steering front wheel of motorcycle - Google Patents

Abstract

PURPOSE:To improve assembling workability by mountably/removably separating a front wheel steering device between a knuckle and a link mechanism. CONSTITUTION:A front wheel 7 is supported by a knuckle 9 with an axle 8 being pivotally rotatably installed on the lower end portion of the knuckle 9. The steering column 6 of a handle mechanism 5 is linked to the top end 9a of the knuckle 9 through a link mechanism 18. The link mechanism 18 is formed with upper and lower link members 20, 21. Thereby, a front wheel steering device 1 in which the handle mechanism 5, link mechanism 18, and knuckle 9 are continuously provided can absorb the up/down movement of the front wheel 8 with respect to a body by varying an opening angle alpha by means of relative rotation of the link members 20, 21 around a pin 19. Also, the knuckle and other portions including the link mechanism can be independently linked to a body frame, improving the assembling workability of the link mechanism to the body.

Description

[Detailed description of the invention] L1 historical dish ±1 The present invention relates to a front wheel steering device for a motorcycle.

1j "L" Conventionally, the front wheel is rotatably supported via the knuckle, and the swing arm extending forward from the middle part of the two wheels and the knuckle are pivotally supported to be steerable, and a primary universal joint is attached to the handlebar side. Front wheel steering row 5A of a motorcycle, in which the upper link connected via a second universal joint and the lower link connected to the knuckle side via a second universal joint are bendably connected so that the front wheel can be steered by operating the handlebar. However, for example, JP-A-62-198588
It is known from the publication No.

°1 and 7' However, in such a front wheel steering device, the knuckle, upper and lower links, and the handle side member are assembled as one piece, and the rest ff1ffi is heavy and the link can be bent in the middle. Because of the intervening mechanism, work efficiency is poor when assembling the vehicle body and connecting it to the 17-body frame.

Therefore, the present invention aims to improve the front wheel steering device and improve workability during assembly.

・To avoid this problem, in the present invention, the knuckle that rotatably supports the front wheel is supported by a swing arm that extends forward from the center of the vehicle body, and is provided above the front of the vehicle body and linked to the handlebar. In a front wheel steering device for a motorcycle in which a handle mechanism and the knuckle are connected via a link mechanism, the knuckle and the link mechanism are mutually attachable and detachable.

According to the present invention, since the front wheel steering device is detachably separated between the knuckle and the link mechanism, the knuckle and the link mechanism are detachably separated.
The other parts, including the link mechanism, should be connected to the car body frame in East Germany, and then the knuckle and link mechanism should be connected, and the handle and link mechanism should be assembled together while finely adjusting their orientation. Since it becomes possible,
Improves assembly workability.

dog-presenting-1 Hereinafter, the present invention will be described with reference to illustrated embodiments.

FIG. 1 is a side view of the main part of the front part of a motorcycle equipped with a front wheel steering device 1 according to the present invention, and FIG. 2 is a front view of the main part.

2 is the vehicle body frame, only a portion of which is shown. A head pipe 3 is fixedly installed above the front part of the vehicle body frame 2, and a handle mechanism 5 interlocking with the handle 4 is connected to the head pipe 3.
It is attached to the vehicle body frame 2 via. A steering stem 6 is a part of the handle mechanism 5, and is connected to the handle 4 and pivotally fitted to the head pipe 3.

The front wheel 7 is supported by the knuckle 9 with its axle 8 rotatably pivoted to the lower end of the knuckle 9. knuckle 9
extends upward while curving outward so as to bypass the tire 10, and its upper end 9a is located directly above and slightly behind the tire 10. An upper swing arm 13 and a lower swing arm 14 are pivotally supported in the center of the vehicle body frame via pivots 11 and 12, respectively, so as to be able to swing up and down, and extend forward. A horizontal axis 15 that is orthogonal to each other is provided at the front end of the arm 13.
It is supported so as to be swingable in a vertical plane and in a horizontal plane via a cross joint 15 consisting of a vertical shaft 15b and a vertical shaft 15b. Similarly, the lower end of the knuckle 9 is attached to the lower swing arm 14.
It is supported at the front end of the shaft to be swingable in the vertical plane and in the horizontal plane via a cross joint 16 consisting of a horizontal shaft 16a and a vertical shaft 16b.

゛In this way, the front wheel 7 is vertically movably suspended on the vehicle body frame via the axle 8, knuckle 9, horizontal shafts 15a, 16a, swing arm 13.14 and pivot shaft 11.12, and the front wheel 7 is vertically movable. A cushion unit 17 for damping the movement is provided between the lower swing arm 14 and the vehicle body frame. Since most of the reaction force that the front wheel 7 receives from the ground is transmitted to the vehicle body frame via the lower swing arm 14, the lower swing arm 14 has a larger cross-sectional shape than the upper swing arm 13.

The knuckle 9 can also swing laterally with respect to the swing arm 13.14 by vertical shafts 15b and 16b,
The front wheels 7 are steered by this rocking motion.

Since the steering movement of the front wheels 7 must be performed in accordance with the operation of the steering wheel 4, the steering stem 6 of the steering wheel mechanism 5 and the upper portion 039a of the knuckle 9 are connected by a link mechanism 18 for this purpose.

The link mechanism 18 consists of upper and lower link members 20 and 21 which are pivotally connected to each other by a laterally oriented pin 19, with the upper link member 20 having its upper end attached to a transverse axis 22a.
The lower link member 21 is attached to a mounting piece 23 provided at the lower end of the steering stem 6 via a cross joint 22 having a front axis 22b and a horizontal axis 24a and a rear axis 24b at its lower end. Mounting piece 2 via cross joint 24
It is attached to 5. The mounting piece 25 is a flat plate-shaped collar portion 2
5a, and the link member 21 is removably connected to the knuckle 9 by fixing the collar portion 25a to the upper surface of the upper end 9a of the knuckle 9 with a bolt 26.

Thus, the handle mechanism 5. A front wheel steering device 1 is formed in which a link mechanism 18 and a knuckle 9 are connected to each other. It can be absorbed by changing the opening angle α. On the other hand, the rotation of the steering stem 6 caused by the operation of the handlebar 4 is directly transmitted to the knuckle 9 due to the lateral rigidity of the link mechanism 18, thereby steering the front wheels 7.

FIG. 3 is an enlarged view showing the connecting portion of the link members 20, 21 in more detail. As shown in the figure, the connecting portion of the link member 20 with the link portion vI21 has two forked portions 20a, 20a that project laterally, and the upper end of the link member 21 is connected between the two forked portions 20a, 20a. Part 21
A is included. The bottle 19 is press-fitted into the upper end portion 21a and protrudes to both sides. Two-crotch part 20a
, 20a, needle bearings 28 having needles 27 are press-fitted into bearing holes 29 drilled in the portions, and a bottle 190 is inserted into these needle bearings 28.
Both ends are rotatably fitted. The needle 27 is intended to cope with the radial loads acting on the pin 19 when the link members 20.21 rotate relative to each other;
Torsional torque during steering is also transmitted from the link member 20 to the bin 19 via the needle 27. Since the needle 27 is located on the outer side away from the center line of the link member 20, the force acting on the needle 27 at this time can be small. Since a thrust load is further generated on the bottle 19 due to the above-mentioned torsional torque, the needle bearing 28 is provided with a needle 30 opposite to the end surface of the bottle 19 for receiving and stopping this thrust load. In this way, by using the bearing 28 that can support the thrust cart and the radial load in the connecting portion between the link member 20 and the link member 21, the lateral rigidity of the connecting portion is improved and the steering response is improved. Similarly, the upper end of the link member 20, ie, the connecting portion with the steering stem 6, has bifurcated portions 20b, 20b.
The horizontal shaft 22a of the cross joint 22 is connected to these parts through needle bearings 31 similar to those described above.
is supported. The horizontal shaft 24a of the cross joint 24 is similarly supported by the bifurcated portion at the hand end of the link member 21.

Brackets 32a and 32b are fixed to the lower end of the knuckle 9 that supports the axle 8, and extend symmetrically to the front and one side of the axle 8, respectively. Brake calipers 33a and 33b are provided at the end portions of the front wheel 7, respectively, on one diameter thereof and facing each other. 34 is a brake disc fixed to the front wheel 7.

4 and 5 show a linkage mechanism 35 according to another embodiment of the present invention. In this link mechanism 35, the upper link member 36 has two left and right plate pieces 36a, 36.
b, these plate pieces 36a, 36
b are connected by a connecting piece 36c.

The lower link member 37 has upper end portions connected to both plate pieces 36a.

36b, and is pivotally supported by the link member 36 via the same pin 19 as in the previous embodiment. Link member 36
As shown in FIG. 4, the link member 37, which is narrower in width than the link member 37, is provided with a convex portion 38, thereby increasing the cross-sectional height of the link member 37 and improving its rigidity as a single unit. Further, the connection piece 36c of the link member 36 is provided with a concave portion 39 for receiving the contact portion 38, so that the link member 36 and the link member 37 are connected to each other.
This is done by reducing the included angle α.

By reducing the angle α in this way, the torsional rigidity of the link mechanism 35 in the assembled state can be increased, and the height of the head vibrator 3 can be kept low. This link mechanism 35 also has a mounting piece 25 as shown in FIG. It is detachably connected to the knuckle 9 via a bolt 26.

As described above, the front wheel steering device 1 according to the present invention is detachably separated between the knuckle 9 and the link mechanism 18.35, so when the front wheel steering device @1 is assembled to the vehicle body, the entire device is assembled into the vehicle body. There is no need to connect the knuckle 9 to the swing arms 13 and 14, and the link mechanism 18
．． 35 to the steering stem 6 or link mechanism 1
After the steering stem 6 with the 8.35 connected thereto is separately attached to the head pipe 3, the two may be connected with the bolt 26. That is, it is only necessary to assemble each component, which is lighter than the entire front wheel steering system 1, to the vehicle body one after another, and it is also possible to assemble while finely adjusting the direction of the handlebar 4, which improves assembly work efficiency. - View.

11Ω As mentioned above, in the present invention, the front wheel is supported rotatably.
A motorcycle in which a knuckle that moves 1 is supported by a swing arm that extends forward from the center of the vehicle body, and a handle mechanism that is provided above the φ body part that is linked to the handle and the knuckle are connected via a link mechanism. In the front wheel steering system, the knuckle and the link mechanism are detachably attached to each other, so when assembling this to the vehicle body, the knuckle and other parts including the link mechanism are neutralized and attached to the vehicle body. All you have to do is connect it to the frame, and then connect the knuckle and link mechanism, and the handle and link structure can be assembled together while finely adjusting their orientation, improving assembly work efficiency. .

[Brief explanation of the drawing]

FIG. 1 shows a motorcycle 1 equipped with a front wheel steering device according to the present invention.
1. FIG. 2 is a front view of the essential parts. FIG. 3 is a partially enlarged view of FIG. 2. FIG. 4 is a schematic side view of a link mechanism according to another embodiment. FIG. 5 is a sectional view taken along line v-v in FIG. 4. 1... Front wheel steering device, 2... Vehicle frame, 3...
・Head pipe, 4... Handle, 5... Handle mechanism, 6... Steering stem, 7... Front wheel, 8
... Axle, 9... Knuckle, 10... Tire, 1
1... Pivot, 12... Pivot, 13... Upper swing arm, 14... Lower swing arm, 15, 16...
・Cross joint, 17... Cushion unit, 18...
- Link mechanism, 19... Pin, 20.21... Link member, 22... Cross joint, 23... Mounting piece, 24
... Cross joint, 25 ... Mounting piece, 26 ... Bolt, 27 ... Needle, 28 ... Needle bearing, 29
... Bearing hole, 30 ... Needle, 31 ... Needle bearing, 32 ... Bracket, 33 ... Brake caliper, 34 ... Brake disc, 35 ... Link 113N, 36.37. ...Link member, 38...
Convex portion, 39... concave portion.

Claims (1)

[Claims] A knuckle that rotatably supports the front wheel is supported by a swing arm extending forward from the center of the vehicle body, and the knuckle is connected via a link mechanism to a handle mechanism provided above the front of the vehicle body and linked to the handlebar. A front wheel steering device for a motorcycle, characterized in that the knuckle and the link mechanism are mutually attachable and detachable.