Mitsubishi Steel Mfg. Co., Ltd.

Mitsubishi Jidosha Kogyo Kabushiki Kaisha

Junji Ogura

Masahiko Shimizu

Yukihiro Sugimoto

Takashi Fujii

Nobuo Momose

Koichi Miyagawa

A suspension coil spring, when assembled to a suspension device, in which a spring reaction axis (AR) is positioned coincident with or sufficiently close to a load input axis (AA), and the design and manufacture of coil springs are facilitated. Namely, a suspension coil spring () in a free state is formed so that a coil axis (AC) is bent in V-shape at bend point (PB) and the distance from the end turn center (CU) of the upper seating surface () to an imaginary coil axis (AI) is an upper inclination amount (V), and the distance from the end turn center (CL) to the imaginary coil axis (AI) is a lower inclination amount (V). When the suspension coil spring () is interposed between spring seats () in the suspension device and compressed along a strut axis, the spring reaction AR axis of the suspension coil spring () is inclined and offset with respect to the imaginary coil axis (AL) according to the inclination amounts (V, V).

Suspension coil spring

A suspension coil spring, when assembled to a suspension device, in which a spring reaction axis is positioned coincident with or sufficiently close to a load input axis, and the design and manufacture of coil springs are facilitated. Namely, A suspension coil spring () in a free state is formed so that a coil axis (AC) is bent in V-shape at bend point (PB) and the distance from the end turn center (CU) of the upper seating surface () to an imaginary coil axis (AI) is an upper inclination amount (V), and the distance from the end turn center (CL) to the imaginary coil axis (AI) is a lower inclination amount (V). When the suspension coil spring () is interposed between spring seats () in the suspension device and compress along a strut axis, the spring reaction axis of the suspension coil spring () is inclined and offset with respect to the imaginary coil axis (AI) according to the inclination amounts (V, V).

Method of producing a suspension coil spring

A lower spring sheet has receiving portions on a sheet surface that supports a coil spring. Thus the sheet surface and a spring end portion of the coil spring come into contact discretely. The contact positions between the coil spring and the sheet surface maintain unchanged, however a undulated portion the spring end portion may have due to the manufacturing tolerance is extended when the coil spring is compressed.

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Tokyo, Japan

Junji Ogura