JPS607986Y2 - Front fork main piston structure - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a main piston structure of a front fork.

A known structure for this part includes an oil lock collar fitted into the inner cylinder, and a check valve sandwiched between the collar and the inner cylinder step.

In addition, in order to generate secondary damping force for the front fork in this type of device, it is common to provide oil holes at the top of the seat pipe, or at positions above and below the main piston part of the inner cylinder. be.

However, in this case, the oil collar attached to the inner cylinder to attach the check valve is generally wedged or crimped to the inner cylinder, so if you want to change the pull-side damping force to one that is more favorable to the passenger, it is necessary to There was an inconvenience that the pipe or inner cylinder had to be replaced.

The purpose of the present invention is to provide a device that makes it easy to remove the oil collar attached to the inner cylinder and replace the check valve in such cases. Consisting of a cylinder 1 and an inner cylinder 2, an oil chamber is provided between a main piston 3 provided on the outer peripheral surface of the inner cylinder 2 and a sub-piston 5 provided on a seat pipe 4 planted on the bottom surface of the outer cylinder 1. 6 and a valve seat which is held in the oil chamber 6 via a stepped portion 7 provided on the inner circumferential surface of the inner cylinder 2 and an oil collar 8 attached to the stepped portion 7. In a front fork provided with a valve 9, an oil passage connecting the upper and lower oil chambers of the piston is provided on the lower surface of the check valve 9, and the oil collar 8 is screwed into a screw provided in the stepped portion 7. It is characterized in that a locking hole 11 for a locking pin 10 inserted from the outer peripheral surface of the inner cylinder 2 is provided on its outer periphery.

The check valve 9 has a plurality of convex portions on the upper half, the recessed portions are formed to serve as oil passages during the pushing stroke of the front fork, and the lower surface has a plurality of oil holes drilled in the axial direction or radially. It is provided with an oil groove formed in the direction, and is normally held against one of the seating portions with a spring 9a.

In the figure, reference numeral 12 denotes an oil lock ring 1 which is held at the tip of the inner cylinder 2 via a flange 8a provided at the tip of the oil collar 8.
Reference numeral 3 indicates an oil seal provided on the outer cylinder 1, and reference numeral 14 indicates an oil lock piece fitted to the outer periphery of the seat pipe 4.

Since the present invention is constructed as described above, a check valve 9 is provided in the oil chamber 6 formed between the main and sub pistons 3 and 5 by compression of the inner cylinder 2 having the main piston 3. is opened, part of the oil in the oil chamber 6 is replenished into the oil chamber above the main piston 3 via the check valve 9, and the other oil flows into the seat pipe through the lower oil hole of the seat pipe 4. At this time, a push-side damping force is generated.

On the other hand, during the pulling stroke, the check valve 9 is pressed against the lower seating part, so the oil in the upper part of the main piston returns to the oil chamber 6 through the oil hole or oil groove provided on the lower surface of the check valve. Generates damping force.

In this way, according to the present invention, the oil collar 8 to which the check valve 9 with the oil hole for adjusting the damping force on the pull side is attached is
Since the check valve 9 is formed into a threaded cylinder that is screwed onto a screw provided on the stepped portion 7 formed on the inner peripheral surface of the inner cylinder 2, the check valve 9 can be easily removed by unscrewing the screw and the oil hole can be adjusted. Therefore, it is possible to prevent the uneconomical need to replace the seat pipe or inner cylinder to adjust the damping force as in the conventional example described above. Since ten locking holes 11 are provided, the locking hole 11 is screwed into the locking hole 11, so that it can be firmly attached without loosening during use.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a partially cutaway longitudinal sectional view, and FIG. 2 is an enlarged view of the main part. 1... Outer cylinder, 2... Inner cylinder, 3...
...Main piston, 4... Seat pipe, 5...
...Sub-piston, 6...Oil chamber, 7...
・・・Step part, 8... Oil color, 9...
...Check valve, 9a... Valve seat, 10...
- Locking pin, 11...Latching hole.

Claims (1)

[Scope of utility model registration request] It consists of an outer cylinder 1 and an inner cylinder 2 that are slidably fitted together, and a main piston 3 is provided on the outer peripheral surface of the inner cylinder 2, and a seat pipe 4 is installed on the bottom surface of the outer cylinder 1. An oil chamber 6 is formed between the auxiliary piston 5 and the oil chamber 6 is provided with a stepped portion 7 provided on the inner circumferential surface of the inner cylinder 2, and an oil collar 8 attached to the stepped portion 7. In a front fork equipped with a check valve 9 having a clamped valve seat 9a, an oil passage connecting the upper and lower oil chambers of the piston is provided on the lower surface of the check valve 9, and the oil collar 8 is connected to the stepped portion 7. The inner cylinder 2 is formed on the outer periphery of the screw cylinder which is screwed onto the provided screw.
A main piston structure of a front fork, characterized in that a locking hole 11 for a locking pin 10 inserted from the outer peripheral surface of the front fork is provided.