BEARING SEAL STRUCTURE

Japanese Patent JP2017072146

A

PROBLEM TO BE SOLVED: To provide a bearing seal structure capable of mitigating a pressure difference between an inside part and an outside part of a shaft case and at the same time preventing foreign material from entering the inside part of this shaft case.SOLUTION: When a temperature of a shaft case 9 is increased, a pressure in a space Sis increased and a pressure difference between an inside part of a shaft case 9 and an outside part of the shaft case 9 is increased, a pressure difference mitigating part 21 is expanded in response to a pressure fluctuation in this space Sto increase a volume of the space S. As a result, the pressure fluctuation in the space Sin the shaft case 9 is mitigated and the pressure difference mitigating part 21 prevents lubricant from leaking out of the inside part of the shaft case 9 to the outside part. In turn, when a temperature in the shaft case 9 is lowered, a pressure in the space Sis lowered and a pressure difference between the inside part of the shaft case 9 and the outside part of the shaft case 9 is decreased, the pressure difference mitigating part 21 is shrunk in response to a pressure fluctuation in this space Sand then a volume of the space Sis decreased. As a result, the pressure fluctuation in the space Sof the shaft case 9 is mitigated and the pressure difference mitigating part 21 prevents the foreign material from entering from the outside part of the shaft case 9 into the inside part thereof.SELECTED DRAWING: Figure 2

KIKAWA SADAYUKI
SUZUKI SEIJI

JP2015197378A

April 13, 2017

October 05, 2015

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RAILWAY TECHNICAL RES INST

F16C33/76; B61F15/12; B61F15/26; B61K9/04; F16C19/26; F16J13/14; F16J15/16

Taketo Okuma

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