JPS59206275A - Mount device of seat pipe in 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 is directed to a mounting device 1' for a seat pipe used, for example, in a front fork used in a motorcycle.

As is well known, a fork pipe with a main piston at the tip is slidably fitted into the tom case, which is filled with oil.
A front fork is used in which an auxiliary piston at the tip of a seat pipe, one of which is planted from the bottom of the tom case, is slidably inserted into the fork pipe to generate damping force during compression and extension. There is. Conventionally, a female thread is provided inside the pipe at the base of the seat pipe, and the seat pipe is installed at the bottom of the case. From the outside to the bottom of the Tom case? It was fixed directly by the bolt.

However, with this configuration in which the base of the sheet pipe is directly fixed to the gimlet case, when high-frequency vibrations such as minute strokes are generated by a valve, etc., the high-frequency vibrations, especially those with small amplitude, are caused by the lift of the pulp. There will be a delay. That is, a time lag may occur continuously or there may be no operation at all. On the other hand, when a sudden impact load occurs, such as when driving over a protrusion, a transient characteristic of the damping force appears. As a result, there was a problem in that the ride was uncomfortable and stable maneuvering was impossible.

The present invention is 5. In order to eliminate such conventional problems, the jet nobbles are attached to the bottom case via rubber, and the vertical high frequency vibrations and impact loads are absorbed by the expansion and contraction of the rubber.

An embodiment of the present invention will be described in detail below with reference to the drawings.

? FIG. 111 is a sectional view showing an embodiment of the present invention.

In the figure, the upper end of the fork pipe 1 is closed by the fork bolt 2, and the lower end is closed by the fork bolt 2. ) mu case 3
These fork ports 2 are slidably inserted and supported in the fork pipe 1, and a tom case 3 is connected between the shock absorbing members of the vehicle body to obtain a well-known loose insertion function. A sub-piston 5 for partitioning the buffer oil 4 in the sliding direction and a damping force 'ff during the compression process are provided.
: An orifice 8' for generating a damping force, an orifice 7 and a pulp 6 for generating a damping force during the elongation process are provided. Incidentally, the above-mentioned sub-piston 5 is attached to the upper end of the piston or piston 8 from the bottom of the bottom case 3.

The above-mentioned installation of the bottom of the bottom case 3 and the base of the seat pipe 8 is done by installing a small inner diameter on the inner periphery of the base of the seat pipe 8 so that the seat pipe 8 can move up and down, as shown in FIG. 10
It is attached to the center of the bottom of the &tom case 3 with a bolt 11 so as to be pressed down, and the seat pipe 8 is made to vibrate up and down to absorb high frequency vibrations. An oil lock piece is attached to the base of the 12-piece seat pipe 8, and an oil lock collar 13 is attached to the tip of the 70-ton fork.

In this way, the high frequency imaging of minute strokes during the operation of the front fork is directly absorbed by the rubber members 9a and gb, so there is no delay due to pulp lift. Therefore, there is no time lag in the damping force against high-frequency vibrations, which cannot be achieved with pulp, and stable operation is possible. It also plays the role of compliance against impact loads. Note that if a gap is provided between the seat pipe 8 and the nut 10, even if the center of the seat pipe 8 is slightly shifted from the center of the tom case 3, it can be avoided.
Since the lower part of the groove 8 is corrected by the arm members 9a and 9b, a floating effect in the radial direction is also produced. It is also effective in improving threading performance and corrosion resistance.

As explained in detail above, the present invention is applicable to the base 7i7 of the seat pipe. Shake it up and down against the tom case? By attaching it with a rubber member so that it can absorb the small strokes that pulp cannot absorb, it has the effect of allowing more stable operation and improving grip comfort.

[Brief explanation of the drawing]

Fig. 1 is a Wi-side view showing one embodiment of the mounting device d of the present invention, and Fig. 2 is an enlarged sectional view of the main part thereof. ]...fork pipe, 3... is tom case, 8...
... Seat pipe, 8a... Protrusion, 9a, 9b...
Rubber member, lO... Nando, 11...? Ruth

Claims (1)

[Claims] Inside the oiled bottom case, a fork pipe with a main piston at the tip is slidably fitted, and one side? In a front fork in which a sub-piston with a jet nozzle embedded from the bottom of the tom case is slidably inserted into the fork or groove, a protrusion with a small inner diameter is installed on the inner periphery of the base of the seat pipe. A front fork mounting device for a front fork, characterized in that it is screwed to the bottom of a bottom case with delts and Nandos via an elastic member to enable vertical vibration and absorb high frequency vibrations. .