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Sealing device

A technology of sealing device and sealing ring, which is applied to the sealing of engines, shafts, mechanically driven excavators/dredgers, etc., and can solve problems such as difficult air and difficult lubricating oil

Inactive Publication Date: 2004-09-01
NIHON KENKI CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this case, when the lubricating oil is supplied from the outside with a grease gun, etc., between the bearing pad and the connecting shaft, for example, the air trapped between the bearing pad and the connecting shaft is difficult to be drawn out from the oil seal, and it is difficult to smoothly perform lubricating oil supply. oil work problem

Method used

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Embodiment Construction

[0037] The sealing device according to the embodiment of the present invention will be described in detail below with reference to the accompanying drawings, for example, it is applied to the bearing device of the arm and the bucket connecting part of the hydraulic excavator.

[0038] Here, Figure 1~ Figure 4 A first embodiment of the invention is shown. 1 is a hydraulic shovel running body, and 2 is a rotating body rotatably mounted on the running body 1 . The rotating body tool has a rotating frame 3 on which a driver's cab 4 , an accessory box cover 5 , a counterweight 6 and the like are arranged.

[0039] 7 is a working device provided on the front side of the rotating body 2 so as to be capable of pitching and pitching. The arm 9 on the front end side of the heavy arm 8 is constituted by a bucket 10 coupled to the front end side of the arm 9 by a pin.

[0040] In the working device 7 , the boom 8 is pitched up and down by the boom hydraulic cylinder 11 , and the arm 9 ...

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PUM

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Abstract

A seal device (31) for a bearing system (21) is constituted by first and second seal rings (32) and (35). The first seal ring (32) is constituted by a lip seal (33) having a lip portion (33B) in sliding contact with an end face (23B) of a bush (23) which is fitted on a joint shaft (26), and a slide tube (34) having a seal surface (34C) on an end face at an axial end away from the lip portion (33B) which is formed integrally with a tubular body portion (33A) of the lip seal (33). The second seal ring (35) is fixedly fitted in a boss (22) radially on the outer side of the first seal ring (32), and provided with a seal surface (35D) on the inner side of an annular inward collar portion (35C) for sliding contact with the seal surface (34C) of the slide tube (34).

Description

technical field [0001] The present invention relates to a sealing device applied to a bearing device provided in a pin coupling portion of a working device, which is equipped in a construction machine such as a hydraulic excavator, for example. Background technique [0002] Generally, in a construction machine such as a hydraulic excavator, a bearing device is provided in order to rotatably connect a boom, an arm, and a bucket forming a front portion of an operation (for example, Japanese Patent Laid-Open No. 6-159346, etc. ). [0003] This first prior art bearing device is composed of a sleeve member, a pair of brackets, and a connecting shaft. Among them, the shaft sleeve is set on one of the aforementioned lifting arms, arms, buckets, etc., and the bearing bush is fixed on the inner peripheral side; a pair of brackets are relatively arranged on the left and right sides of the shaft sleeve member; the connecting shaft It is used to rotatably connect the sleeve member to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02F9/00F16C11/04F16C33/74
CPCF16J15/3456F16C33/102F16C33/74F16C11/045F16J15/344E02F9/006F16C2350/26
Inventor 秋田秀树铃木良平五木田修高牟礼辰雄村木弘昌安藤典行
Owner NIHON KENKI CO LTD