FIELD: machine building.
SUBSTANCE: group of inventions relates to machine building. Bumper comprises fasteners and cylindrical or conical three-strand compression spring. Compression spring with pull over its coils is rigidly secured in wire shell of rubber-metal. Spring thrust coils are free. Shell cross-section can be round, oval, rectangular with rounded or non-rounded angles. Sizes of spring coil cross-section in said shell and spring lead are set to allow a required clearance between adjacent coils. Proposed method comprises the steps that follow. Workpiece is formed by winding the lengths of expanded spiral on central core and pre-compressed thereat in radial directions. Formed workpiece is withdrawn from central core, fitted on spring spiral and finally compressed in special mould to required shell parameters.
EFFECT: simplified design and process, higher load-bearing capacity and strength.
11 cl, 12 dwg
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