Bearing seal and swing device

Abstract

A bearing seal and rotating device, comprising an outer seal that is easily displaced in the radial direction, an inner ring that is an annular rigid portion that does not extend in the radial direction, an inner seal with a sealing lip, and an outer ring that is arranged on the outer periphery of the outer seal Composition, and the elastic coefficient of the inner seal is set larger than the elastic coefficient of the outer seal. The ring-shaped rigid part is used as a boundary to ensure the tightness of the inner seal and the pin. When the radial displacement of the pin is displaced, the ring-shaped rigid part is integrally displaced by the inner seal following the displacement of the pin, and can be absorbed by the outer seal. Displacement of the ring-shaped rigid part.

Description

technical field [0001] The present invention relates to a bearing sealing device mainly used for pin-hinge connection of construction machines such as hydraulic excavators. Background technique [0002] In the hydraulic excavator of the construction machine, the swing is freely connected by the boom and the boom, the boom and the bucket or pins. [0003] In this way, in the pin-connected part, that is, in the pin-hinge connection, in general, lubricating oil such as grease (grease) is filled between the pin and the bushing to swing smoothly, and it is possible to prevent the pin from being resisted by the metal. Indirect wear and abnormal sound generation. [0004] In addition, to prevent sand and soil from entering between the pin and the bushing from the outside, and to prevent lubricating oil from leaking from the gap between the pin and the bushing, a bearing sealing device called a radial lip seal is used. [0005] As this bearing sealing device, for example, what is ...

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Problems solved by technology

[0019] In conjunction with the above description, in the conventional bearing sealing device described in the above-mentioned patent documents, although the sealing performance is generally good, there is a problem that the sealing performance is reduced when the vibration caused by the impact is applied.

[0020] In the sealing device having this type of inner seal, it is difficult for butter to leak from between the inner seal and the pin when the butter rises, and there is a problem that it is impossible to confirm the end of the rise of the butter.

[0021] In addition, if the sealing performance is lowered, there are problems that the durability of the pin connection will be reduced due to the easy penetration of sand and soil, and the leakage of lubricating oil, and the problem of frequent replenishment of lubricating oil.

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