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    • 2. 发明专利
    • Bearing device
    • 空值
    • JP5172444B2
    • 2013-03-27
    • JP2008104767
    • 2008-04-14
    • 日立建機株式会社日本バルカー工業株式会社
    • 秀樹 秋田修 五木田暁子 佐藤英二 根来富義 山崎
    • F16C33/74F16J15/32
    • F16C33/74E02F9/006F16C11/045F16C33/102F16C2240/40F16C2350/26F16J15/166F16J15/3232F16J15/3276
    • A dust seal (20) is provided with a tubular fitting portion (20A), a bush end surface abutting portion (20B), a lip portion (20D) and a sealing projection (20E) integrally formed. The sealing projection (20E) is formed to project in an axially opposite direction to the lip portion (20D) from a radial inner section of the bush end surface abutting portion (20B) and abuts against a chamfered portion (14E) of a bush (14) in such a manner as to overlap the chamfered portion. Therefore, at the time of supplying lubricant such as grease between the bush (14) and a connecting pin (17), the sealing projection (20E) can prevent a part of the lubricant from entering between an end surface (14D) of the bush (14) and the bush end surface abutting portion (20B) of the dust seal (20) to maintain a sealed state therebetween. In consequence, the dust seal (20) can be stably held on the inner peripheral side of a boss member (12), preventing the pulling-out of the dust seal (20) by a lubricant agent supplying pressure.
    • 防尘密封(20)具有一体形成的管状嵌合部(20A),衬套端面抵接部(20B),唇部(20D)和密封突起(20E)。 所述密封突起(20E)形成为从所述衬套端面抵接部(20B)的径向内侧部朝向所述唇部(20D)的轴向相反的方向突出并与所述衬套的倒角部(14E)抵接 14)以与倒角部分重叠的方式。 因此,在衬套(14)和连接销(17)之间供给润滑剂等润滑剂的时候,密封突起(20E)能够防止一部分润滑剂进入衬套(14)的端面(14D) (14)和防尘密封件(20)的衬套端面抵接部(20B)之间保持密封状态。 因此,能够将防尘密封件20稳定地保持在凸台部件(12)的内周侧,防止灰尘密封件(20)由供给压力的润滑剂引出。