JPS62120290A - Cushion mechanism 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 (Field of Industrial Application) The present invention relates to a cushion mechanism for a motorcycle that includes a front cushion and a rear cushion.

(Prior Art) When a motorcycle is braked while running, the center of gravity of the vehicle moves forward due to inertia, causing a nose dive phenomenon in which the front of the vehicle body sinks, impairing steering stability.

Therefore, in order to prevent this nose dive during braking, various anti-dive mechanisms have been considered.

(Problems to be Solved by the Invention) Incidentally, in order to prevent the vehicle from leaning forward which normally occurs during braking, it is desirable to prevent the rear from floating.

Therefore, it is possible to make the rear suspension rigid to prevent lift, but since the load distribution is originally shifted to the front side, the rear wheels will lift due to inertia.

Also, if you try to swing the rear with the anti-dive mechanism, the rear suspension will become stiff and lose its buffering function during braking, and the effectiveness will be reduced unless you apply the rear fork before the front brake.

(Means for Solving the Problems) In order to solve the above problems, the present invention fixes a cylinder to the bottom case of the front cushion, and the cylinder moves downward according to the vertical movement of the inner cylinder of the front cushion. A moving piston rod is inserted through the cylinder, and the inside of the cylinder is defined into two oil chambers by the piston provided in the piston loft.Furthermore, within the piston rod is an oil passage that moves forward and backward according to the operation of the brake and communicates the two oil chambers. At the same time, one of the oil chambers inside the cylinder was communicated with the oil chamber facing the free piston that supports the suspension spring of the rear cushion.

(Function) When the brake is operated, the sliding of the piston fixed to the piston rod connected to the inner cylinder of the front cushion is suppressed, thereby preventing the front cushion from sinking.The free piston also supports the suspension spring of the rear cushion. By reducing the initial load on the suspension spring to zero by avoiding a drop in the hydraulic pressure against the suspension spring, 1) the effect of the suspension spring being lowered can be reduced;

(Example) Embodiments of the present invention will be described below based on the accompanying drawings.

FIG. 1 describes an embodiment of the present invention based on the accompanying drawings.

FIG. 1 is a layout diagram of the cushion mechanism according to this first case, and FIG. 2 is a sectional view of the cushion mechanism.

The front cushion (1) has a bottom case (2) and a second inner cylinder (3) is slidably inserted through the bottom case (2), and a cylinder (5) is fixed to the bottom case (2). A piston rod (7) that moves downward by L in accordance with the vertical movement of the inner cylinder (3) is inserted by screwing the upper end into a bracket (6) fixed to the inner cylinder (3), and the piston rod (7) A piston (8) installed in the cylinder (5) opens two oil chambers (S
+), (Sz).

Also, inside the piston rod (7) is a brake lever (1).
The inner rod (0) advances and retreats via a rocking plate (11) swingably supported on the bracket (6) according to the operation of the inner rod (
12) and the oil chamber (S+) of the cylinder (5).
) and (Sz) are formed, and this oil passage (13) is opened and closed by the forward and backward movements of the inner rod (12).

In addition, the oil chamber (Sz) of the cylinder (5) is connected to the pipe (15).
) is connected to the oil chamber (S3) of the sub-tank (17) in which the free piston (1B) is slidably fitted, and the air chamber (S4) of the other chamber of this sub-tank (17) is supplied with gas. It is enclosed.

On the other hand, the rear cushion (21) consists of a cylinder (22) and a piston (slidably fitted inside the cylinder (22)).
23), an upper metal (25) fixed to the frame is attached to the end of the piston rod (24) to which the piston (23) is fixed, and a sub-tank (2G) is attached to the outer peripheral surface of the cylinder (22). to form a free piston (
A suspension spring (28) is stretched between the free piston (27) and the bracket (28) of the rear metal (25). Further, the lower metal (29) formed at the do portion of the cylinder (22) is fixed to the wheel side via the rear fork.

Then, the oil chamber of the front cushion cylinder (5) (
Free bis i-n (2) of S and rear cushion (21)
It communicates with the oil chamber (S5) facing B) via a pipe (30).

The diameter of the free piston (16) of the sub-tank (17) and the gas filling pressure in the chamber (S4) are based on the rear cushion (21).
The maximum load of the spring (28) is such that it will not be compressed.

The operation of the cushion mechanism having the following construction will be explained below.

When the brake (10) is not applied, the oil passage (13) in the oil chamber (Sl) and oil chamber (Sz) of the cylinder (5) is open, so the piston (8) slides with almost no resistance. The front cushion (+) has the same cushioning function as before.

When the brake (10) is applied, the rocking plate (11) rotates in the direction of arrow a, the inner rod (12) descends, and the oil chamber (Sl) and oil chamber (S2) in the piston rod (page 7) are moved. ), as the front cushion (1) sinks due to inertia, the oil chamber (S2
) flows into the oil chamber (Ss) of the sub-tank (17) and pushes the piston (16) in the direction of arrow A to compress the gas in the air chamber (Sl). Inner cylinder (
Try to suppress the sinking of 3).

On the other hand, the hydraulic oil corresponding to the increase in the volume of the oil chamber (Sl) due to the lowering of the piston (8) is transferred to the oil chamber (Ss) of the sub-tank (2B).
from the pipe (30) into the oil chamber (Sl),
The free piston (27) of the sub tank (26) is indicated by arrow C.
The suspension spring (28) becomes unloaded and the rear part of the vehicle sinks due to the weight. The air chamber (SL) at the front of the vehicle tries to prevent it from sinking, and the entire vehicle slowly tries to sink, maintaining a stable posture.

Next, when the brake (lO) is released, the rocking plate (11) rotates in the direction indicated by the arrow, and the inner rod (12) moves -L'
The oil chamber (Sl) and the oil chamber (S2) are connected to open the oil passage (13) in the cylinder rotor (7) which communicates the oil chamber (Sl) in the A cylinder (5) with the oil chamber (S2). Since the pressure is the same, the pressure in the air chamber (Sl) of the subtank (17) increases 7
The oil chamber of the sub-tank (26) in the cushion (21) (
Ss) also acts to push the free piston (27) in the direction of the arrow, compressing the suspension spring (28) under a predetermined load.

(Effects of the Invention) As is clear from the above description, according to the present invention, the front cushion sinks by stopping the sliding of the piston fixed to the piston rod connected to the inner ring of the front cushion by brake operation. By reducing the hydraulic pressure on the free piston that supports the suspension spring of the rear cushion and reducing the initial load on the suspension spring to zero, the rear cushion is given the effect of lowering, making it easier to move while the motorcycle is running. Prevents the vehicle from leaning forward when the brakes are applied.

Therefore, driving stability when applying the brakes and steering stability during cornering are significantly improved.

[Brief explanation of drawings]

Figure 1 is a layout diagram of the cushion mechanism according to the present invention, Figure 2 is a layout diagram of the cushion mechanism according to the present invention;
The figure is a sectional view of the cushion mechanism. In addition, (1) front fork, (3) inner cylinder, (5) cylinder, (7) piston rod,
(8) is a piston, (10) is a brake, (11) is an inner rod, (13) is an oil passage, (16) is a free piston, (17) is a sub tank, (22) a beam axis, (26) is the sub-tank, (28) is the suspension spring, (
30) is a vibrator, (Sl), (S2), (Sl), (Ss) is an oil chamber, and (Sl) is an air chamber.

Claims (1)

[Claims] In a cushion mechanism for a motorcycle equipped with a front cushion and a rear cushion, a cylinder is fixed to the bottom case of the front cushion, and the cylinder is provided with a piston rod that moves up and down in accordance with the up and down movement of the inner cylinder of the front cushion. , this piston rod faces inside the cylinder, and the inside of the cylinder is divided into two oil chambers by the piston provided on the piston rod, and furthermore, the piston rod is moved forward and backward by the operation of the brake to open the two oil chambers. A cushion mechanism for a motorcycle, characterized in that an inner rod for opening and closing a communicating oil passage is inserted therethrough, and one side of the oil chamber communicates with an oil chamber facing a free piston that supports a suspension spring of a rear cushion.