JPH0336751Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an improvement of a hydraulic shock absorber for two-wheeled vehicles.

(Prior Art) Hydraulic shock absorbers for motorcycles generate abrasion powder due to the friction between the inner tube and the outer periphery of the built-in spring, which mixes with the hydraulic fluid. This also occurs on the sliding surfaces between the inner tube and the outer tube.

(Problem that the invention aims to solve) The wear particles generated in this way can cause damage to the sliding surface of the inner tube and damage the sealing part, resulting in oil leakage and reduced sliding performance. This may cause deterioration and impair the durability of the buffer.

In addition, if the generated damping force is variably controlled by an external electric signal via an electromagnetic damping valve depending on the operating condition, wear particles may be attracted to the electromagnetic damping valve. There was also the problem that it caused fluctuations in valve opening characteristics, etc.

The present invention aims to solve such problems.

(Means for Solving the Problems) Therefore, the present invention provides a hydraulic shock absorber for two-wheeled vehicles in which an inner tube is slidably inserted into an outer tube, and an oil chamber defined inside is filled with hydraulic oil. A magnet is installed near the passage through which hydraulic oil flows as the inner tube expands and contracts with respect to the outer tube to attract wear particles.

(Function) When the magnet is attached in this manner, the magnet attracts abrasion powder generated as the inner tube expands and contracts, thereby preventing damage to the sliding part and malfunction.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

In the embodiment shown in FIG. 1, 1 is an inner tube, 2 is an outer tube, 3 is a piston portion, 4 is a suspension spring, and 5 is a hollow cylinder.

As the inner tube 1 enters, a portion of the hydraulic oil in the lower oil chamber B flows into the upper oil chamber A, and
Hydraulic oil corresponding to the entering volume of the inner tube 1 flows into the hollow cylinder 5 from the lower passages 6A and 6B, and flows into the upper oil reservoir chamber C. Said passage 6A
An electromagnetic damping valve 7 is interposed between
When the armature 7B is attracted against the force C, the valve 7D interlocked with the armature 7B is seated on the seat portion 7E, providing resistance to the flow of hydraulic oil.

Therefore, when the electromagnetic damping valve 7 is energized by an external signal, for example, during braking, it closes, thereby preventing the inner tube 1 from sinking.

Note that the damping force can be freely adjusted by exciting the electromagnetic damping valve 7 according to other operating conditions.

A passage 6B is located at the bottom of this electromagnetic damping valve 7.
A permanent magnet 8 for adsorbing wear particles is provided. Note that the permanent magnet 8 is attached to a removable plug 9 and can be removed from the valve body 7F.

With the structure described above, as the inner tube 1 expands and contracts, the abrasion powder generated from the sliding contact portion moves along with the flow of hydraulic oil, but in the middle of the movement, the permanent It is attracted by the magnet 8.

In this way, the generated wear particles are removed by adsorption, so that the sliding parts may be damaged due to the wear particles getting caught, or the wear particles may be attracted to the magnetized portion of the electromagnetic damping valve 7, resulting in malfunction. This can be reliably prevented from occurring.

To explain the embodiment of FIG. 2, in place of the electromagnetic damping valve 7, a pressure sensing valve 10 is installed which senses the internal pressure and changes the flow resistance of the hydraulic oil flowing from the passages 6A to 6B. This is what I did.

In the pressure sensing valve 10, the sensing spool 10A is displaced toward the outside air against the spring 10B in response to the pressure of the hydraulic oil, and the valve 10C approaches the seat 10D, increasing the damping force.

As the entering stroke amount of the inner tube 1 increases, the internal pressure of the oil reservoir chamber C increases, and therefore a stroke position dependent damping force is exerted where the generated damping force becomes maximum near the maximum compression.

The hydraulic oil passes from the passage 6B through the annular passage 11 and the through hole 12, and is located in the middle of this passage to the hollow cylinder 5.
A cylindrical permanent magnet 8 is disposed around the outer periphery of the base end of the rotor to attract wear particles in the hydraulic oil.

Since the permanent magnet 8 is located at the bottom of the passage, even if it attracts wear particles, it does not create enough resistance to affect the flow of hydraulic oil.

In addition, in this embodiment, a permanent magnet 8 was provided on the outer periphery of the hollow cylinder 5, but as shown by a dashed line,
The permanent magnet 8' may be fixed to the inner peripheral base of the hollow cylinder 5 with an adhesive resin material. Furthermore, although the above embodiments have been described as having the electromagnetic damping valve 7 and the pressure sensing valve 10, it goes without saying that the present invention can also be applied to ordinary hydraulic shock absorbers that do not have these damping valves.

(Effects of the invention) As described above, the present invention has a magnet that attracts wear particles at the bottom of the flow path where hydraulic oil flows, so it attracts the wear particles that flow into the hydraulic oil. This has the effect of preventing damage to the sliding parts and seal parts, preventing oil leakage, improving durability, and avoiding malfunction of the damping valve.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a first embodiment of the present invention, and FIG. 2 is a sectional view of a second embodiment. DESCRIPTION OF SYMBOLS 1... Inner tube, 2... Outer tube, 5... Hollow cylinder, 6A, 6B... Passage, 7... Electromagnetic damping valve, 8... Permanent magnet, 10...
...Pressure sensing valve.

Claims (1)

[Scope of utility model registration request] In a hydraulic shock absorber for a motorcycle, in which an inner tube is slidably inserted into an outer tube and an oil chamber defined inside is filled with hydraulic oil, the hydraulic oil flows as the inner tube expands and contracts with respect to the outer tube. A hydraulic shock absorber for two-wheeled vehicles characterized by having a magnet attached near the passageway to attract wear particles.