JPS5893686A - Anti-nose dive front fork - 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 The present invention relates to an anti-nose dive front fork for motorcycles, tricycles, etc.

Conventional 7-cent forks of this type required a large amount of oil to be filled with oil in the outer cylinder as well as the inner cylinder, and the damping force was adjusted between them.

The present invention eliminates these conventional drawbacks, allows damping force to be adjusted with a small amount of oil, and provides an anti-nose system that prevents the steering wheel from sinking when braking is applied while driving. The purpose is to provide a dive front fork.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, (1) is an inner cylinder of a front fork, which is slidably fitted into an outer cylinder (2) K. Inside this outer cylinder, iz), an oil chamber extending in the axial direction is provided at the sliding part with the inner cylinder (1), and this oil chamber is connected to the inner oil chamber (3A).
) and the outer oil chamber (3B) K2 are provided with a cylinder (4), which is fixed to a guide member (5) fixed between the inner and outer cylinders. Note that (8) is a sealing member. This circle 11 (4
) are provided with oil holes (7A, 7B) at both ends thereof, and a separation wall (8) including a sealing member is provided in the center of the cylinder (4) between it and the outer cylinder (2). Between a pair of oil holes (9A, 9B) provided in the outer cylinder (2) K sandwiching this separation wall (8), an oriice (12a) communicating with the oil holes is closed during expansion and opened during compression. A stop valve is provided. This check valve (1m) has the valve stem (13a) slidably inserted into the operating rod a, and the valve stem (13a)
A circular spring plate aη is moated at a certain distance between K and the check valve Q3, and the valve shaft (13a) K is connected to a spring I[α
A seat plate DI that hits only the outer circumference of η is inserted, and a coil spring as interposed between this seat plate a- and the operating lever ae.
K therefore seat [orga spring 1 [a? ) is in constant contact with the outer circumference of O. In addition, the operating lever (le) is attached to the outer cylinder (2) K by the flexible cable I connected to the brake lever.
2). That is, when the brakes are applied while driving, the operating rod is pushed through the operating lever a, and the pushing force causes the outer periphery of the spring plate a to curve through the coil spring field, causing the check valve to close. (The damping force works sequentially until 13 is pressed, and then the orifice (12a) is completely closed to block the oil holes (9A, 9B).
7 oaks are now prevented from sinking. Note that the orifice (12a) has a plurality of orifices (12b) with different diameters.

12c).

Further, in addition to the above-described damping mechanism, the front fork according to the present invention is provided with a damping mechanism that operates with a relatively small damping force. That is, as shown in Figure 3,
The outer cylinder (2) has nine oil holes (IOA).

10B), the check valve shaft that opens the oil hole (IOA) when extended and closes the same oil hole (IOA) when compressed is a coil spring r.
In the normal elongation process, the oil is held by the oil holes (IOA, IOB
) is extended by a damping mechanism flowing through the K.

In addition to the orifice (22a), there are a plurality of orifices (22b, 22c) K having different diameters, so that the damping force can be adjusted. Furthermore, as shown in Figure 4, oil holes (IIA, IIB) K provided in the outer cylinder (2) K,
The oil hole (IIA) is opened during extension, and the oil hole (IIA) is opened during compression.
If the check valve (2) that closes the oil hole (IIA) is held by a coil spring K and there is a sudden pressure change due to the orifice (25a)
B) is expanded by a damping mechanism that flows through it. This damping mechanism has an orifice (25a
), as well as multiple orifices of different diameters (25b, 25
c) Kn is set so that the damping force can be adjusted by K.

In addition, (2) in Fig. 1 is a sliding wall (cylinder) fixed to the outer circumference of the inner cylinder (1) and in contact with the inner circumference of the cylinder (4). In compression work 1, the oil moves to the oil hole (7B) side, and the oil in the oil chamber (3A) passes through the oil hole (γB), and from the oil chamber (3B) to the oil hole (9B) and from the oriice (12a). Pass through the check valve α hot water to the oil hole (9A
) K flow, during which the sterilizing action works 0 On the other hand, in the extension work 1, the line moves to the sliding wall aha oil hole (7 people) side, and the oil in the oil chamber (3 people) is normally oil. The flow flows from the oil hole (IOA) through the check valve to the orifice (22a) and the oil hole (IOB), but if there is a sudden pressure change, the flow flows from the oil hole (IIA) to the check valve (to) and then to the orifice. (25a), oil hole (IIB
) to make it grow faster.

As mentioned above, the present invention provides an axial oil chamber between the inner and outer cylinders on the outer cylinder side, and divides the oil chamber into two with a cylinder to provide a buffering effect, thereby reducing the amount of oil. It is possible to adjust the damping force, and the amount of movement of the sliding wall can also be increased, which has the effect of making the device more compact. Furthermore, in addition to these effects, the present invention links the braking mechanism and the damping mechanism to adjust the damping force according to the braking displacement, so that it is possible to adjust the damping force while driving (when applying the brakes). The effect of accurately preventing sinking is amazing, and the mechanism is simple, so it is advantageous in terms of cost.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, FIG. 3 is a longitudinal cross-sectional view taken along line B-B in FIG. The figure is a longitudinal cross-sectional view taken along line C-C in figure t42. 1...Inner cylinder, 2...Outer cylinder, 3A, 3B...Oil chamber,
4...Cylinder, 5...Guide member, 7A, 7B...
Oil hole, 8... Separation wall, 9A, 9B, IOA, 10B
, 11AtllB...oil hole, 12a, 22a, 2
5a... Orifice, 13, 20, 23... Check valve, 14... Flexible cable, Ji... Operation lever, ]6.
...Operating rod, 17...Circular spring plate, 18...Seat plate,
Recommended...Sliding wall.

Claims (1)

[Claims] In a nine front fork in which the inner and outer cylinders are slidable, an oil chamber (i) extending in the axial direction is provided inside the outer cylinder (i) of the sliding part.
3A, 3B), and the oil chamber is made into a circle 11.
The cylinder is divided into two parts (inner and outer) by 11 (4), and oil holes (7A, 7B) are provided at both ends of the cylinder, and a separation wall (8) is provided between the outer cylinder and the central part of the cylinder. A damping mechanism is provided which is connected to the oil holes (9A, 9B) provided in the outer cylinder between the walls, has check valves (13, 3), and 23) in opposite directions, and is connected to the brake lever. The flexible cable A4 presses the operating lever (1!9) into which the shaft (13a) of the check valve AS is slidably inserted, via the operating lever (1!9) provided on the outer cylinder (2) K. At the same time, the spring plate (tη) provided on the outer periphery of the reversing valve AS, the outer cylinder (2) and the orifice (12a) communicating with the nine oil holes (9A, 9B) via the coil spring frame and seat plate. Or (12b, 12c) An anti-nose dive front fork with a mechanism for adjusting.