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Patent Searching and Data


Title:
METHOD OF MANUFACTURING DISC SPRING AND CLUTCH DEVICE
Document Type and Number:
WIPO Patent Application WO/2007/111222
Kind Code:
A1
Abstract:
A clutch device comprises two clutch mechanisms having clutch drums therein. A ring-like master disc spring and a ring-like slave disc spring are installed between a driven plate and a piston in the clutch drum of each of the clutch mechanisms. The master disc spring and the slave disc spring have the same plate thickness. In the slave disc spring, a plurality of slits are formed in the inner peripheral part, and the load in a flat state produced when it is elastically deformed can be adjusted to a desired value. The blanks (1A, 2A) of the master disc spring and the slave disc spring are made of plates having the same plate thickness by press. In particular, when the slave disc spring is small enough to be stored inside the master disc spring, the blank (2A) of the slave disc spring is punched out from the inner area of the blank (1A) of the master disc spring. Since disc springs each of which has a desired load produced when they are in a flat state can be made of the same plate, the yield of the material of the disc springs can be enhanced and the number of production steps can be reduced.

Inventors:
ANDO SHUJI (JP)
Application Number:
PCT/JP2007/055898
Publication Date:
October 04, 2007
Filing Date:
March 22, 2007
Export Citation:
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Assignee:
NHK SPRING CO LTD (JP)
ANDO SHUJI (JP)
International Classes:
B21D28/00; B21D53/00; B21D53/16; F16D25/0638; F16F1/02; F16F1/32
Foreign References:
JPH06106277A1994-04-19
JPH0214127B21990-04-06
JPS5910548U1984-01-23
JP2005282811A2005-10-13
JPH0932918A1997-02-07
Other References:
See also references of EP 2002908A4
Attorney, Agent or Firm:
SUENARI, Mikio (6-13 Kyobashi1-chome, Chuo-k, Tokyo 31, JP)
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