Equiangular helical leaf spring

Abstract

The invention relates to an equiangular-spiral leaf spring. The left spring comprises two vortex arms and two vortex grooves, wherein the two vortex grooves are symmetrically distributed at an angle of 180 degrees; vortex groove profiles are determined with the equiangular spiral equation as follows: r=ae<btheta> (a and b are larger than 0), a and b are constants, a refers to the adjustable vortex line pole deviation distance, b refers to the adjustable profile expansion speed, r refers to the polar radius, e refers to the Napierian base, and theta refers to the polar angle. Different leaf springs adopt different a and b values, vortex groove profiles which are deviated from poles in different positions and have different shapes can be obtained by changing parameters a and b of the profiles, starting positions and end positions of the vortex groove profiles can be controlled by changing the polar angle theta, and the leaf springs in different shapes can be designed according to different actual performance requirements. Seal ends of the equiangular-spiral vortex grooves are in semi-circular and linear smooth transition. The leaf spring is uniform in stress distribution, small in local stress, simple in profile and seal method design, convenient to machine, high in reliability and long in service life and has the higher radial rigidity and certain axial rigidity.

Description

technical field [0001] The invention relates to a spring, in particular to a piston which can be used to support linear motion, and is mainly used for a leaf spring of a Stirling machine or a linear compressor. Background technique [0002] The leaf spring is a part formed by constructing a vortex groove line on a circular elastic sheet material with a hole in the center, and using laser cutting, wire cutting or chemical etching technology. The vibrating elastic arm on the plate spring is used to support the compression piston and expansion piston in the Stirling machine, keep the gap between the piston and the cylinder sealed during the movement, and can also adjust the phase difference between the compression piston and the expansion piston. [0003] According to the number of elastic arms, the leaf spring can be divided into two, three, four and multi-arm springs. According to the spatial distribution of the scroll groove, it can be divided into concentric leaf spring an...

AI Technical Summary

Problems solved by technology

[0013] 4. The evolute and involute of an equiangular spiral are still equiangular spirals

Disadvantages of the leaf spring: the profile is composed of multiple concentric arcs and eccentric arcs, and the tangential transition between the arcs must be ensured, so the expression and design of the profile are complex and difficult to machine.

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