Title:
COILED SPRING
Document Type and Number:
WIPO Patent Application WO/2006/129710
Kind Code:
A1
Abstract:
A coiled spring enabling a reduction in Hertzian stress at its first winding part and undue force at its winding end part. A clearance is formed between the winding end part (11) and the first winding part (13) of a wire (3) in such a free state that a load is not applied to the coiled spring by displacing the winding end part (11) on a movable part side from the first winding part (13) of the wire (3) in the coil diameter increasing or decreasing direction. Accordingly, shot peening can be applied also between the winding end part (11) and the first winding part (13) of the wire (3). Though a stress acting on the first winding part (13) forms the synthetic stress of a torsional stress and the Hertzian stress due to contact, when the winding end part (11) with a high contact pressure is displaced in the coil diameter increasing direction, the torsional stress can be reduced by moving the contact point on the first winding part (13) side in the coil outer diameter direction. Since the clearance is formed by displacing the winding end part (11) from the first winding part (13) of the wire (3) in the coil diameter increasing or decreasing direction, even if the winding end part (11) and the first winding part (13) are repeatedly brought into contact with and separated from each other between the clearance, the acting of the undue bending stress on the winding end part (11) can be suppressed to suppress the breakage of the winding end part.
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Inventors:
Takamura, Noritoshi c/o NHK SPRING CO. (LTD 4056, Aza-sakuradai, Nakatsu, Aikawa-mach, Aikoh-gun Kanagawa 03, 24303, JP)
Tendo, Satoru c/o NHK SPRING CO. (LTD 4056, Aza-sakuradai, Nakatsu, Aikawa-mach, Aikoh-gun Kanagawa 03, 24303, JP)
Tendo, Satoru c/o NHK SPRING CO. (LTD 4056, Aza-sakuradai, Nakatsu, Aikawa-mach, Aikoh-gun Kanagawa 03, 24303, JP)
Application Number:
PCT/JP2006/310876
Publication Date:
December 07, 2006
Filing Date:
May 31, 2006
Export Citation:
Assignee:
NHK SPRING CO., LTD. (3-10, Fukuura Kanazawa-K, Yokohama-shi Kanagawa 04, 23600, JP)
Takamura, Noritoshi c/o NHK SPRING CO. (LTD 4056, Aza-sakuradai, Nakatsu, Aikawa-mach, Aikoh-gun Kanagawa 03, 24303, JP)
Tendo, Satoru c/o NHK SPRING CO. (LTD 4056, Aza-sakuradai, Nakatsu, Aikawa-mach, Aikoh-gun Kanagawa 03, 24303, JP)
Takamura, Noritoshi c/o NHK SPRING CO. (LTD 4056, Aza-sakuradai, Nakatsu, Aikawa-mach, Aikoh-gun Kanagawa 03, 24303, JP)
Tendo, Satoru c/o NHK SPRING CO. (LTD 4056, Aza-sakuradai, Nakatsu, Aikawa-mach, Aikoh-gun Kanagawa 03, 24303, JP)
International Classes:
F16F1/06; F01L3/10
Attorney, Agent or Firm:
Sudo, Yuichi (1-12-1, Nishishinbashi Minato-ku, Tokyo, 105-0003, JP)
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