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Title:
COMPRESSION COIL SPRING DEVICE HAVING DISCONTINUOUS SUPPORT STRUCTURE
Document Type and Number:
WIPO Patent Application WO/2003/046406
Kind Code:
A1
Abstract:
In a compression coil spring device wound in coil form and having a seat wound portion at an end thereof and suitable for the strut type suspension device of an automobile, the seat wound portion is supported by a spring seat through one or more discontinuous points. This is realized by an arrangement in which the coil wire of the seat wound portion has a plurality of projections along the direction of the length thereof, which projections support the seat wound portion at one or more discontinuous points. Thus, so long as the spring end is supported by discontinuous points, the coil spring will develop a uniform spring characteristic irrespective of changes in load in connection with the center of gravity of contact pressure or the line of action of spring force, and the spring constant. That is, the change in the effective number of turns according to the spring load is minimized, the relationship between load and the amount of compression is made substantially linear, and the angle change in the line of action of spring force can be minimized. According to this, the seat wound portion contacts the spring seat only at predetermined projections, so that variations in such factors as the spring characteristic between individual coil springs, the frictional resistance in the contact portion, and the bending moment become smaller.

Inventors:
Umezawa, Masahiro c/o NHK SPRING CO. (LTD. 10 Fukuura 3-chom, Kanazawa-ku Yokohama-shi Kanagawa, 236-0004, JP)
Kato, Tomotake c/o NHK SPRING CO. (LTD. 10 Fukuura 3-chom, Kanazawa-ku Yokohama-shi Kanagawa, 236-0004, JP)
Hamano, Toshio c/o NHK SPRING CO. (LTD. 10 Fukuura 3-chom, Kanazawa-ku Yokohama-shi Kanagawa, 236-0004, JP)
Ueda, Masanao c/o NHK SPRING CO. (LTD. 10 Fukuura 3-chom, Kanazawa-ku Yokohama-shi Kanagawa, 236-0004, JP)
Application Number:
PCT/JP2002/012267
Publication Date:
June 05, 2003
Filing Date:
November 25, 2002
Export Citation:
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Assignee:
NHK SPRING CO., LTD (10 Fukuura 3-chome, Kanazawa-ku Yokohama-shi, Kanagawa, 236-0004, JP)
Umezawa, Masahiro c/o NHK SPRING CO. (LTD. 10 Fukuura 3-chom, Kanazawa-ku Yokohama-shi Kanagawa, 236-0004, JP)
Kato, Tomotake c/o NHK SPRING CO. (LTD. 10 Fukuura 3-chom, Kanazawa-ku Yokohama-shi Kanagawa, 236-0004, JP)
Hamano, Toshio c/o NHK SPRING CO. (LTD. 10 Fukuura 3-chom, Kanazawa-ku Yokohama-shi Kanagawa, 236-0004, JP)
Ueda, Masanao c/o NHK SPRING CO. (LTD. 10 Fukuura 3-chom, Kanazawa-ku Yokohama-shi Kanagawa, 236-0004, JP)
International Classes:
F16F1/12; (IPC1-7): F16F9/32; F16F1/06
Foreign References:
JP2001026208A
JPH08270704A
Attorney, Agent or Firm:
Oshima, Yoichi (7th Floor, Kitagawa Bldg. 6-42 Kagurazaka Shinjuku-ku, Tokyo, 162-0825, JP)
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