Patent ID: 11919347
Assignee: APM ENGINEERING AND RESEARCH SDN. BHD.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC B  F | IPC B  F

Claim 0:
1. A coil spring for use in a vehicle suspension system, comprising:
an elongated body formed by a plurality of continuous coils;
wherein the body includes an upper section and a lower section;
wherein the upper section and the lower section of the body form a J shape profile;
wherein pitches and coil angles of the coils in the upper section are consistent to form an upright profile for the upper section;
wherein pitches and coil angles of two or more coils at a free end of the lower section is differed from the pitches and the coil angles of the coils in the upper section to form a gradually curved profile for the lower section;
wherein the coil angles of the two or more coils at the free end of the lower section is greater than the coil angles of the coils in the upper section;
wherein the pitches of the two or more coils at the free end of the lower section is greater than the pitches of the coils in the upper section;
wherein the upright profile of the upper section includes a first axis that aligns with a vertical reference line, while the gradually curved profile of the lower section includes a second axis that tangentially diverges from the vertical reference line; and
wherein the J-shape profile generates increased lateral force while ensuring even gap between coils at the lower section during compression to eliminate interference between adjacent coils.