JPS6150888A - Supporter for front wheel of motorcycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention provides a method for loosening the front wheel. This invention relates to a rii single wheel support device for a two-wheeled motor vehicle that is supported through seven means.

(Prior art) In a motorcycle, the +ii7 wheels are supported by a pair of left and right front forks with a constant caster angle.
In this case, the front fork has a structure in which the upper tube and the lower tube can be linearly expanded and contracted, and a buffer spring is provided between the upper and lower front tubes to provide cushioning during running.

1-General techniques are disclosed in Japanese Patent Publication No. 44-4694, for example.
It is stated in the No.

According to a motorcycle having such a shock absorbing device, since the structure is such that two wooden tubes are slidably fitted to each other in an inside-outside relationship, especially when the above-mentioned caster angle α is large, Frictional resistance is likely to occur due to twisting, and this has the drawback that smooth cushioning cannot be achieved.

Also, when riding slowly, the lower tube moves linearly rearward and diagonally upward relative to the upper tube, so
This means that the front wheels have also moved in the same direction, and as a result, especially when the caster angle α is large, the change in wheelbase becomes large and there is a problem that the running stability of both IL vehicles is impaired.

Furthermore, the conventional shock absorbing spring has 1
Because the interior was designed to expand and contract in a quadratic manner, there was a problem with the bottom part of the car easily hitting the bottom while driving.

(Object of the Invention) This invention has been made in view of the above-mentioned problems, and provides smooth buffering, improves the running stability of the vehicle, and prevents the vehicle from bottoming out while running. The purpose is to

(Structure of the Invention) In order to achieve the above object, the present invention includes a heavy wheel support frame, a swinging arm to which a front wheel is connected and swinging up and down, a swinging buffer cylinder having a loosening means, and a swinging arm that swings up and down. moving arm and I
A swinging bell crank that connects the two cylinders is installed.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In Fig. 1, 1 is the front wheel, 2 is the rear wheel, and the center (front axle) of tbJ wheel l is 3. The center of the rear wheel 2 is indicated by 4. Furthermore, CG is the position of the center of gravity when viewed from the side when a driver (one person) rides this two-wheeled motor vehicle (completed product).

Now, to explain the case where both the front wheel 1 and the rear wheel 2 are braked, due to the inertia force F in the forward horizontal direction due to braking, the grounding point E1 of the front wheel 1 is applied with a braking force F1 in the horizontal direction rearward.
At the same time, a braking force F2 also acts horizontally rearward on the grounding point of the rear gear 12.

The above F has the relationship F=F1 +F2. In addition, the vertically upward increased load that acts on +ii+·l at the grounding point E of the front wheel 1 due to inertial force is expressed as ΔR,
Similarly, the reduced load acting on the rear wheel 2 is expressed as -ΔR.

In this case, the composite vector of Fl and ΔR is P.

The direction is a slightly diagonal upper blade facing backwards, and the F
The composite vector of 2 and 1 ΔR is F2, and its direction is backward and slightly diagonally downward.

Here, the momentary swing center of the front wheel 1 is set to 0, and the momentary swing center 0 is the grounding point E of the front wheel 1.

Assuming that it is about r behind from and at a height of C,
- As is well known, the hunching yield rate is expressed as Lφ01 ・c/r X100 (%) (1). Here, L is wheel),
O1 represents F, /F, and h represent the height of CG from the grounding point E2 of the rear wheel 2.

Based on the above formula (1), the anti-dive rate is 100%
Theoretically, this means that the amount of sinking is O.

In order to obtain a 100% anti-dive rate,
First, we considered the modified form r of the above equation (1) from various aspects.

In other words, although the drawing shows the case where both the front wheel 1 and the rear wheel 2 are braked, here, assuming a state where the rear wheel 2 is not braked, that is, a state of F=F, and i8, 01=
By becoming i, the above equation (2) becomes r.

In this equation (3), c. r If so, the anti-dive rate will be the ideal 100%.

Here, the above equation (4) has the same relationship as h/L=c/r.

This equation (5) means that the anti-dive rate can be determined to 100% based on the dimensional proportional relationship.

In other words, the point I corresponding to the height h of the center of gravity CG of the vertical line V-H from the grounding point E2 of the rear wheel 2 and the grounding point El of the front wheel 1.
It is satisfied if the instantaneous swing center is located on the line X connecting the The point that is satisfied is oI, in this case ΔE, E
2 H has h as the M2 side, wheelbase L as the long side, and ΔE and A formed by 101
O, has a similar relationship to ΔE, E2 H, with C1 as the short side and rl as the long side. Due to this,
The above relationship h/L=C/r=(c+/rl) is satisfied.

Therefore, an anti-type mechanism that effectively operates and initiates 01 as the center of instantaneous movement was constructed as shown in the fJS1 diagram.

That is, 5 is a front wheel support frame, and as shown in FIG. 2, a pair of these 111 wheel support frames 5 are arranged on the left and right sides of the head vibro (FIG. 1). 7 in FIG. 1 is a swinging arm, and this swinging arm 7 is as shown in the f:fIJ2 diagram.
A pair of upper and lower wheels are provided on each of the left and right front wheel support frames 5, respectively. As shown in FIG.
, each of which is placed in the front so that it can be held in the mouth and expanded slightly. In this way, it expands forward while narrowing backward, and the intersection point is 1st moment J, % dynamic center 0. matches.

The 1.f moving arm 7 of this l= )" is located at the center 3 of the front wheel l.
10 via an upper arm fulcrum 8 and a lower arm fulcrum 9.

As shown in FIG. 2, the upper part of the movable arm 7 is provided with a connecting bracket 11 which is of a left-right facing type and projects upward.

A buffer cylinder 12 has a spring (buffer means) therein, and the buffer cylinder 12 is swingably attached to the 1ij wheel support frame 5 via a cylinder fixing shaft 13 at one end thereof. Reference numeral 14 in FIG. 1 is a bell crank, and 15 is a push-up link, which constitute a transmission link.
The bell crank 14 is swingably attached to a crank fixing bin 16 disposed below the bell crank 14, and one swinging upper end of the bell crank 14 and the swinging tip of the buffer cylinder 12 are connected by a first connecting bin 17. On the other hand, bell crank 1
The other end of the swinging lower part of 4 and the push-up link 15 are connected to the second
They are connected by a connecting bin 18, and the lower end of this push-up link 15 is
It is connected to the swing arm which is the above-mentioned connection bracket (11) via a third connection pin 19.

Therefore, in the above configuration, the one-wheel suspension is provided with a swinging shock absorber vi, which is provided by the swing arm 7, the swing shock absorber cylinder 12, and the swing bell crank 14 that transmits transmission between them. Since it is structured as a structure, the swing of the swing arm 7 when the vehicle is running or braking is smoothly transmitted to the first slow cylinder 12, thereby reducing the frictional resistance and smoothly moving the swing arm 7. I can do it.

In addition, (a front wheel suspension system using a movable arm 7 is adopted, and in particular, in the above embodiment, from the normal state 1g in Fig. 1 to 1g)
- Even if the swing arm 7 swings in the front wheel direction, the amount of movement of the vehicle (front wheel center) 3 in the longitudinal direction is suppressed to a sufficiently small amount, thereby making the small change in the wheel pace L sufficiently small. This improves the running stability of the vehicle.

Furthermore, the bell crank 14 is connected to the buffer cylinder 12, and the spring in the buffer cylinder 12 is compressed in a quadratic manner according to the swinging of the bell crank 14, so that the relative rise of the front wheel 1 is prevented. Accordingly, a gradually stronger spring force is applied, and as a result, it is possible to provide a suspension that is less likely to bottom out during driving. (9. Effect of light) As described above, according to the present invention, The front wheel is connected to a front wheel support frame, and includes a swinging arm that swings up and down to which the front wheel is connected, a swinging buffer cylinder that has a buffer means, and a swinging bell crank that connects the swinging arm and the buffer cylinder. Since it is attached, it is possible to provide smooth cushioning, improve stability when traveling in small circles, and prevent bottoming out in the city while traveling.

[Brief explanation of the drawing]

Fig. 1 is a side view showing one embodiment of this invention; Fig. 2 is a side view showing an embodiment of the present invention;
It is a sectional view taken along the line II-II in the figure. DESCRIPTION OF SYMBOLS 1... Front wheel, 5... Front wheel support frame, 7... Rocking 7-m, 12... Buffer cylinder, 14... Bell crank.

Claims (1)

[Claims] (1) A swinging arm to which the front wheel is connected to the front wheel support frame and swings up and down, a swinging buffer cylinder having a buffer means, and a swinging bell crank that connects the swinging arm and the buffer cylinder. A front wheel support device for a two-wheeled motor vehicle, characterized in that it is equipped with: