Title:
中空コイルばねおよびその製造方法
Document Type and Number:
Japanese Patent JP5339540
Kind Code:
B2
Abstract:
A hollow coil spring and a method for manufacturing therefor can prevent corrosion at an inner surface and can improve product appearance. In an end sealing step, an end Wa is sealed by which the core material of the end Wa of a spring member W is gathered by machining. It is preferable that spinning be carried out as a machining. For example, a squeezing roller R is moved in an axial direction as necessary, while the end of the spring member W is pressed to the inside in a radial direction by the squeezing roller R. As a result, the end Wa of the spring member W is sealed as shown in Fig. 3 , and therefore, it is not necessary to use another member such as a lid member. For example, the end sealing step can be immediately carried out after an inner surface processing step. In a coil forming step after the end sealing step, formation of clearance can be prevented at the end Wa, even if the end Wa of the spring member W is gripped and the spring member W is wound around the rod.
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Inventors:
Takashi Yajima
Kenichiro Morino
Kenichiro Morino
Application Number:
JP2010268156A
Publication Date:
November 13, 2013
Filing Date:
December 01, 2010
Export Citation:
Assignee:
Nippon Jojo Co., Ltd.
International Classes:
F16F1/06; B21F35/00; B21H1/18
Domestic Patent References:
| JP49083454U | ||||
| JP181968C2 | ||||
| JP56065738U | ||||
| JP59033041A | ||||
| JP48101356A |
Attorney, Agent or Firm:
Suenari Mikio