Torsion bar spring combined by multistrand bar steel

Abstract

The invention discloses a torsion bar spring combined by multistrand bar steel. The existing cylinder spiral torsion spring and the spiral spring used in a belt tightening device of an engine as the torsion springs are hard to realize lightweight design, have large torque loss, noise and high cost in the part serialization process. The torsion bar spring is a multistrand combination body combined by at least three strands of bar steel with polygonal cross section along the length direction, especially the bar steel with regular hexagonal cross section at same size. A connecting piece for tightening the bar steel which forms the multistrand combination body is arranged at one end of the multistrand combination body, and the multistrand combination body is sleeved tightly by a tightening pipe. The installation angle and working torsion angle of the spring can be adjusted and changed during use, so that the torsion bar spring generates corresponding torque and the belt tightening force of the engine can be adjusted. The spring has high torsional rigidity, small rotating center, small torque loss after long-time working in the working range, no frictional noise and long fatigue life.

Description

technical field [0001] The invention relates to a spring, in particular to a torsion bar spring combined with multiple strands of steel for an engine belt tensioner. Background technique [0002] The torsion springs used in the engine belt tensioner are currently widely used as traditional cylindrical helical torsion springs and scroll springs, which have the following disadvantages: [0003] Due to the characteristics of the design structure of the traditional cylindrical spiral type and scroll type, when it needs to bear a large torque, the design of the spring body (including material cross-sectional size, external space size, etc.) must be increased accordingly, especially the increase in the center of rotation , resulting in an increase in the volume of the tensioner assembly, making it difficult to achieve a lightweight design. Therefore, a new design is required to meet the requirements of a small rotation center and a lightweight design when it needs to withstand ...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved and the technical task proposed by the present invention are to overcome the difficulty in realizing lightweight design, large torque loss and noise generation when the existing cylindrical helical torsion spring and scroll spring are used as torsion springs in the engine belt tensioner , The defect of high cost in the serialization process of parts and components, providing a torsion bar spring combined with multiple strands of steel

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