JPS6039553Y2 - Hydraulic shock absorber oil temperature cooling system - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an oil temperature cooling device for a hydraulic shock absorber used in vehicles such as automobiles and motorcycles.

When a vehicle such as a car or motorcycle travels on a paved road, the expansion and contraction of the hydraulic shock absorber is small, but when the vehicle travels on uneven ground such as rough or rough ground, the hydraulic shock absorber expands and contracts. Expansion and contraction operations are performed at high speed.

The above-mentioned hydraulic shock absorber generally has a piston having a small hole for generating damping force inserted into a cylinder filled with oil, and as the piston slides, oil flows through the small hole to damp vibrations. Because of this, when driving on an uneven surface like the one mentioned above, the shock absorber piston moves up and down repeatedly, causing the temperature of the built-in oil to rise rapidly and the viscosity of the oil to drop, making it impossible to obtain the desired damping effect. As a result, there was a problem in that the vehicle lacked running stability and resulted in a decrease in maneuverability.

Therefore, in order to eliminate such problems, various structures have been proposed in the past.

For example, the one listed in Japanese Unexamined Patent Publication No. 48-3757 is known, but the ones in Figures 1, 2, and 5 of the same publication are for the discharge and suction of oil when the hydraulic shock absorber expands and contracts. Since the oil simply flows in and out of the tank, it has very little effect on preventing temperature rise.Also, in the case of the oil in Figure 3, the oil being discharged and taken in is forcibly circulated through the check valve, so it has no cooling effect. is larger than those in Fig. 1, Fig. 2, and Fig. 5, but although the cooling effect is large due to the closeness of the check valve, it is incomplete, and furthermore, the one in Fig. 4 is The oil discharged and taken in only flows into and out of the radiator, and as shown in Figures 1 and 2.
Although the effects can be expected compared to those shown in Fig. 5 and Fig. 5, there is a drawback that the results do not change much.

The purpose of this invention is to completely eliminate the above-mentioned problems by creating a structure in which the oil discharged during compression operation is reliably circulated through the tank chamber and sucked in during extension operation, thereby increasing the temperature of the hydraulic shock absorber. An object of the present invention is to provide an oil temperature cooling device for a hydraulic shock absorber, which suppresses damping force characteristics and stabilizes damping force characteristics.

Hereinafter, details of the present invention will be explained using examples shown in the drawings.

The figure is a longitudinal sectional view of a hydraulic shock absorber equipped with an oil temperature cooling device according to the present invention.

In the figure, the reference numeral 1 indicates a shock absorber main body, and in this shock absorber main body 1, a piston 2 is slidably inserted into a cylinder 3 filled with oil, and a piston extending upward from the piston 2. The rod 4 passes through a bearing 5 fitted into the upper end of the cylinder 3 and protrudes to the outside.

Further, the piston 2 has a seal (not shown) attached to its outer periphery to partition the inside of the cylinder 3 into upper and lower working chambers 6a, 6b, and a damping force generating valve (not shown) is used to operate the piston 2. It is subjected to damping resistance.

Reference numeral 7 denotes a tank chamber provided separately from the air conditioner main body 1, and this tank chamber 7 has an oil chamber 9 and a high-pressure oil chamber inside, with a free piston 8 slidably inserted therein. It is divided into a gas chamber 10 for volume compensation filled with active gas, and a fin member 11 is fitted to the outside of the oil chamber 9 to provide a cooling passage 12 in the shape of a torn fin. .

The gas chamber 10 for volume compensation is not covered by the fin member 11 to prevent the gas chamber 10 from expanding due to temperature rise.

Further, the cooling passage 12 having a fin-shaped cross section and the oil chamber 9 communicate with each other via a small hole 13 .

Further, the oil chamber 9 and the cylinder 3 communicate with each other via a first passage 14, and the cooling passage 12 and the cylinder 3 communicate with each other via a second passage 15. The first passage 14 and the second passage 15 are normally closed by a first check valve 16 and a second check valve 17, respectively.

That is, the first check valve 16 is configured to be pushed open only when discharged oil from the cylinder 3 flows into the oil chamber 9 of the tank chamber 7, and the second check valve 1
7 is configured to be pushed open only when oil flows from the oil chamber 9 of the tank chamber 7 through the cooling passage 12 into the cylinder 3.

Now, the oil corresponding to the volume of Rondo accompanying the downward movement of the piston is pushed out from the cylinder 3 to the first passage 14, and is further pushed open the first check valve 16 to be discharged into the oil chamber 9 of the tank chamber 7. be done.

On the other hand, when the piston is rising, the oil in the oil chamber 9 is guided from the small hole 13 to the cooling passage 12 and the second passage 15, and then to the second passage 15.
The check valve 17 is pushed open and the liquid is drawn into the cylinder 3.

With such a configuration, the oil discharged during compression flows into the tank chamber 7.
It is cooled by being stored in the cooling passage 12, and when it is expanded, it is further cooled by the cooling passage 12 having a fin-shaped cross section, so that the cooling effect is even greater.

Further, since the piston 2 has a slower expansion speed than a compression speed, the speed through which the piston 2 passes through the cooling passage 12 having a fin-shaped cross section is slow, and therefore the cooling effect is large.

As explained above, according to the oil temperature cooling device for a hydraulic shock absorber according to the present invention, a tank chamber separate from the shock absorber body is prepared separately, and the working chamber in the shock absorber body is connected to the tank chamber. and an external passage that communicates with the tank chamber, respectively, through passages, and a check valve that only allows flow in one direction is installed in these passages, so the rise in oil temperature can be reliably suppressed. This prevents the viscosity of the oil in the cylinder from decreasing, which prevents a decrease in the damping force as a shock absorber, and ensures comfortable easing even when driving on uneven surfaces such as rough or rough ground. You can get a sanitary effect.

In addition, since the oil temperature does not rise much, it has extremely excellent effects such as not damaging oil seals and causing oil leakage.

[Brief explanation of drawings]

The figure is a longitudinal sectional view of a hydraulic shock absorber equipped with an oil temperature cooling device according to the present invention. 1...Buffer body, 3...Cylinder,
7... Tank room, 12... Cooling passage.

Claims (1)

[Scope of utility model registration request] A tank chamber separate from the shock absorber body is prepared separately, a passage 14 connecting the shock absorber body internal working chamber 6b and the tank internal oil chamber 9, a tank internal oil chamber 9, a cooling passage 12 formed on the outer periphery of the tank chamber, A series of oil passages are formed by the cooling passage 12 and the passage 15 that connects the working chamber 6b in the shock absorber body, and in the middle of the oil passage there are located before and after the oil chamber in the tank, and the oil passage in the tank is This oil temperature cooling device for a hydraulic shock absorber is provided with a check valve that only allows oil to flow into a chamber and a check valve that only allows oil to flow out from an oil chamber in a tank.