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Patent Searching and Data

Document Type and Number:
WIPO Patent Application WO/2007/058243
Kind Code:
This invention provides a constant velocity universal joint that can prevent damage to a boot in a constant velocity joint caused by expansion of the boot or removal of the boot from a boot band through centrifugal force due to the action of the mass of a lubricating oil on the boot and, at the same time, can suppress the movement of a lubricating grease from a sliding part into the boot and can prevent the exhaustion of the lubricating grease in the sliding part in inner and outer rings. A lubricating grease is filled into between an outer ring (2) and an inner ring (1). A bellows-type boot (8) of rubber or resin is mounted so as to lie astride the outer periphery of the outer ring (2) and the outer periphery of a shaft (7) held by the inner ring (1). The boot (8) has on its inside an elastic resin foam (9) filled into and molded integrally with the boot (8). The elastic resin foam (9) has elasticity high enough to follow the bending deformation of the boot (8) and has lower specific gravity than the lubricating grease. The end parts of the boot (8) are fastened with a belt-shaped fastening tool (the so-called boot bands) (10, 11) for hermetical sealing.

KOHARA, Mika (1578 Higashikaizuka, Iwata-sh, Shizuoka 37, 4380037, JP)
Application Number:
Publication Date:
May 24, 2007
Filing Date:
November 16, 2006
Export Citation:
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NTN CORPORATION (3-17, Kyomachibori 1-chome Nishi-ku, Osaka-sh, Osaka 03, 5500003, JP)
NTN株式会社 (〒03 大阪府大阪市西区京町堀1丁目3番17号 Osaka, 5500003, JP)
International Classes:
F16D3/84; F16D3/20; F16J3/04; F16J15/52
Foreign References:
Attorney, Agent or Firm:
KAMADA, Bunji et al. (18-12, Nipponbashi 1-chome Chuo-ku, Osaka-sh, Osaka 73, 5420073, JP)
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