Title:
FILTERING MEDIUM OF OIL FILTER FOR AUTOMATIC TRANSMISSION
Document Type and Number:
WIPO Patent Application WO/2002/087727
Kind Code:
A1
Abstract:
A filter element (30) which has a filtering medium (31) formed by ruffling a fiber sheet and a resin frame (32) surrounding the perimeter of the filtering medium (31); and a filtering medium (31) which comprises a fiber sheet comprising a heat-resistant fiber having a melting temperature or a carbonization temperature of 300°C or higher. As the heat-resistant fiber, use can be made of a meta-type or para-type wholly aromatic polyamide fiber, a wholly aromatic polyester fiber, a polyphenylene sulfide fiber, or a polyamideimide fiber. As a fiber constituting the fiber sheet except the heat-resistant fiber, use can be made of a fiber having a softening point of 150°C or higher such as a polyamide based fiber, a polyester based fiber, an acrylic fiber, or a vinylon fiber. Preferably, the heat-resistant fiber accounts for 3 mass % or more of the fiber sheet. The filtering medium is suppressed in the reduction of bursting strength during use and causes no substantial problems in practical use.
Inventors:
KOBAYASHI MASAKI (JP)
SUZUKI HIROKAZU (JP)
SUZUKI HIROKAZU (JP)
Application Number:
PCT/JP2002/004131
Publication Date:
November 07, 2002
Filing Date:
April 25, 2002
Export Citation:
Assignee:
TOYO ROKI SEIZO KK (JP)
KOBAYASHI MASAKI (JP)
SUZUKI HIROKAZU (JP)
KOBAYASHI MASAKI (JP)
SUZUKI HIROKAZU (JP)
International Classes:
B01D35/02; B01D39/16; D04H1/4342; D04H1/587; F16H41/30; F16H57/04; (IPC1-7): B01D39/16; F16H57/02; F16H57/04
Foreign References:
| JPH10112952A | 1998-04-28 | |||
| JP2001157806A | 2001-06-12 | |||
| JPH1160780A | 1999-03-05 | |||
| JPS59155647A | 1984-09-04 | |||
| US5336556A | 1994-08-09 | |||
| US4337155A | 1982-06-29 | |||
| US4100323A | 1978-07-11 | |||
| US3871850A | 1975-03-18 |
Attorney, Agent or Firm:
Ishikawa, Yasuo (4F 17-11 Shiba 2-chome Minato-ku, Tokyo, JP)
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