Vibration damping device of inverted structure

Abstract

The invention provides a vibration damping device of an inverted structure having a lower friction property. A low-friction lubricant and a low-friction sleeve are provided between the working cylinder and the outer cylinder. The vibration damping device of an inverted structure includes a cylinder, a rod capable of protruding and retracting in the cylinder, an outer cylinder coupled to the rod and inserted over the outer periphery of the cylinder, and a bush slidably inserted between the outer cylinder and the cylinder. A gap between the outer cylinder and the cylinder is filled with lubricating oil. The bush contains polytetrafluoroethylene and perfluoro alkoxy alkane. The lubricating oil contains an organic molybdenum additive.

Description

technical field [0001] The invention relates to a vibration damping device with an inverted structure. Background technique [0002] Conventional vibration damping devices (damping devices) having an upright structure have a problem that lateral force applied to the vibration damping device is received by a rod serving as a piston in the cylinder, and the rod is easily deformed. However, if the diameter of the rod is increased to increase the rigidity of the rod, the frictional force generated in the vibration damping device will increase, and the reaction force of the rod will also increase. Accordingly, when a vibration damping device having a large rod diameter is used as a shock absorber of a vehicle, for example, the ride quality of the vehicle or the like deteriorates due to an increase in the top of the shock absorber. Therefore, it is difficult to achieve both damping and rigidity of the vibration damping device having an upright structure. [0003] In order to dea...

AI Technical Summary

Problems solved by technology

In addition, the vibration damping device with an inverted structure is limited to a single-tube type, so the rebound force of the gas chamber is increased compared with a double-tube type vibration damping device

Due to such an increase in rebound force, the oil inside the vibration damping device with an inverted structure tends to thermally expand, and when used as a shock absorber for a vehicle, for example, the height of the vehicle tends to change due to temperature.

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