CN1749593A - Combined twisting spring - Google Patents

Abstract

The present invention belongs to the field of mechanical technology. The combined twisting spring consists of two end parallel planes and three or more parallel strips between the two planes and distributed in one circle parallel to the planes. Each of the strips has two ends fixed separately inside the two end planes. Each of the strips may have relatively small size for certain flexibility and have relatively high axial, radial rigidity and strength and stability. The present invention may be used in various mechanical fields and may be made as one kind of standard mechanical parts.

Description

Combined twisting spring

Technical field

The present invention's combined twisting spring is a kind of mechanical part, is used for various mechanical devices, belongs to mechanical equipment technical field.

Background technique

In the prior art, usually helical spring directly is used as torsion spring.Another torsion spring is exactly the torsion bar spring in the so-called Special spring, is made into bar with elastic material, and its cross section can be rectangle, ellipse, or circular.Impose torsion at its two ends, perhaps an end is fixed, and imposes torsion at the other end, and bar is distorted.

Summary of the invention

With regard to torsion bar spring; for reversing of big load; because its suffered load is bigger, to its axially and radial rigidity and intensity and stability requirement very high, in order to satisfy this requirement; must strengthen its sectional dimension; if like this, usually can be in the rigidity that has improved torsion bar spring and intensity and stability, its torsional stiffness is also improving; and require the torsional stiffness of torsion spring unsuitable excessive usually, should have certain pliability.So, in the axial and radial rigidity that improves torsion spring and intensity and stability while, can make torsion spring keep certain pliability again, we have invented a kind of combined twisting spring.

The present invention's combined twisting spring is made up of two end faces and the bar more than three or three, two end faces are at space parallel, at a distance of certain distance, on direction perpendicular to two end faces, cross two end faces and have a geometrical axis, each bar each other and parallel with this geometrical axis between two end faces, around this geometrical axis be evenly distributed on one with on the geometrical axis be the center of circle a bit, be parallel on the circumference of two end faces, the two ends of each bar are separately fixed on two end faces.

Owing to adopt several bars, make the present invention's combined twisting spring axially significantly improve on the whole with the rigidity and the intensity that directly make progress.Still owing to adopt several bars, so the size of every bar can be decided smallerly, for a short time, can keep certain pliability to it, thereby make this torsion spring axially have a more substantial increase with the rigidity that makes progress of footpath and intensity and stability, and torsional stiffness is less, torsion angle is bigger, thus keep as torsion spring the suppleness that should have.

Description of drawings

Fig. 1 is the plan view of the present invention's combined twisting spring.Fig. 2 is that the present invention's end face is that the combined twisting spring of circular flat is analysed and observe left view along plan view A-A direction.Fig. 3 is that the present invention's end face is that ring planar combination formula torsion spring is analysed and observe left view along plan view A-A direction.The schematic representation that Fig. 4 is the bar cross section when oval.Fig. 5 is the plan view of bar cross section combined twisting spring of the present invention when being rhombus.Fig. 6 is that left view is analysed and observe along the present invention's combined twisting spring plan view B-B direction when being rhombus in the bar cross section.Its a kind of distribution schematic representation when Fig. 7 is many bar combinations.Fig. 8 is the stressed schematic representation of single bar.

Embodiment

This combined twisting spring is made up of two end faces and the bar more than three or three, and each bar is distributed between two end faces, sees Fig. 1, shown in Figure 2.Two end faces can be circular flats 1,2, as shown in Figure 2, also can be ring planes 4, as shown in Figure 3.Two end faces are at space parallel, at a distance of certain distance.On the direction perpendicular to two end faces, there is a geometrical axis in the geometrical center of crossing two end faces.Two end faces are made by rigid material.Between two end faces each bar each other and parallel with this geometrical axis, around this geometrical axis be evenly distributed on one with on the geometrical axis be the center of circle a bit, be parallel on the circumference of two end faces.The two ends of each bar 3 are separately fixed at two end face inboards separately.The cross section of bar can be a rectangle, as shown in Figure 2, also can be oval, as shown in Figure 4, can also be rhombus, as Fig. 5, shown in Figure 6.Rectangle, ellipse, rhombus center separately is evenly distributed on the circumference in 360 ° of scopes, and their major axis radially radially distributes along this circumference, sees shown in Figure 7.Bar is made by elastic material.Each combined twisting spring is only selected the bar of a kind of shape, size and material for use.

In order to help the understanding of the present invention and enforcement, on mechanics, do some essential analysis below in conjunction with a concrete technological scheme of the present invention's combined twisting spring.See Fig. 7, shown in Figure 8, two end faces are selected flange plate for use, and the bar cross section is a rectangle, and n bar is evenly distributed on the circumference that radius is R, and the bar cross section is h * b, and bar is long to be l, and the Young's modulus of establishing its material is E.When this torsion spring was subjected to torsion, the force-bearing situation of each bar 3 was seen shown in Figure 8.If it is P that bar 3 heads produce the required power of unit displacement ₁, P ₁Be approximate torsion, then have:

${\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="A20051001719400073.png"\; state="\{\{state\}\}">P</figure-callout>}}_1=\frac{3\mathrm{<figure-callout\; id="3"\; label="EI\; l"\; filenames="A20051001719400073.png"\; state="\{\{state\}\}">EI</figure-callout>}}{l^{}}$

Wherein: I is the moment of inertia of bar 3, and:

$I=\frac{{\mathrm{<figure-callout\; id="3"\; label="bh"\; filenames="A20051001719400073.png"\; state="\{\{state\}\}">bh</figure-callout>}}^3}{12}$

Then the torsional stiffness K of combined twisting spring is:

$K=\frac{{\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="A20051001719400073.png"\; state="\{\{state\}\}">P</figure-callout>}}_1\&times;R}{\frac{1}{R}}\&times;n=\frac{3\mathrm{EI}{R}^2\mathrm{<figure-callout\; id="3"\; label="n\; l"\; filenames="A20051001719400073.png"\; state="\{\{state\}\}">n</figure-callout>}}{l^{}}=\frac{\mathrm{nEb}{h}^3{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="A20051001719400071.png"\; state="\{\{state\}\}">R</figure-callout>}}^2}{4{\mathrm{<figure-callout\; id="3"\; label="l"\; filenames="A20051001719400073.png"\; state="\{\{state\}\}">l</figure-callout>}}^3}$

About combined twisting spring thrust load P, consider that torsion spring is subjected to that main failure mode is a loses stability after the thrust load, so:

$P=\frac{2{\mathrm{\&pi;}}^2\mathrm{EI}}{{\left(2l\right)}^2}=\frac{{\mathrm{\&pi;}}^2\mathrm{<figure-callout\; id="3"\; label="nEb\; h"\; filenames="A20051001719400073.png"\; state="\{\{state\}\}">nEb</figure-callout>}{h}^{}{}^3}{48{\mathrm{<figure-callout\; id="2"\; label="l"\; filenames="A20051001719400071.png"\; state="\{\{state\}\}">l</figure-callout>}}^2}$

About Stress Check, the maximum permissible stress of a bit locating arbitrarily on the bar is:

${\mathrm{\&sigma;}}_{\max }=\frac{M_{\max }}{W}=\frac{M_{\mathrm{<figure-callout\; id="2"\; label="max\; b\; h"\; filenames="A20051001719400071.png"\; state="\{\{state\}\}">max</figure-callout>}}}{\frac{b{h}^{}}{}}\&le;\left[\mathrm{\&sigma;}\right]$

Wherein [σ] is the allowable stress of bar material therefor;

Then bar Maximum Torque that can provide is:

$M_{\max }=\frac{\mathrm{<figure-callout\; id="2"\; label="b\; h"\; filenames="A20051001719400071.png"\; state="\{\{state\}\}">b</figure-callout>}{h}^{}{}^2}{6}\left[\mathrm{\&sigma;}\right]$

So the bar 3 heads power of calculating by allowable stress allowed to bear is:

${\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="A20051001719400073.png"\; state="\{\{state\}\}">P</figure-callout>}}_1=\frac{M_{\max }}{l}=\frac{{\mathrm{bh}}^2\left[\mathrm{\&sigma;}\right]}{6l}$

At last, obtain the Maximum Torque M that combined twisting spring can provide:

$M=P_{1}R=\frac{\mathrm{nR}{\mathrm{bh}}^2\left[\mathrm{\&sigma;}\right]}{6l}.$

Claims (10)

1, a kind of combined twisting spring, comprising the torsion bar spring that is bar, it is characterized in that, form by two end faces and the bar more than three or three, two end faces are at space parallel, at a distance of certain distance, on direction perpendicular to two end faces, cross two end faces and have a geometrical axis, each bar each other and parallel with this geometrical axis between two end faces, be evenly distributed on one a bit being the center of circle on the geometrical axis around this geometrical axis, be parallel on the circumference of two end faces, the two ends of each bar are separately fixed on two end faces.

2, combined twisting spring according to claim 1 is characterized in that, two end faces can be circular flat (1,2) or ring plane (4).

3, combined twisting spring according to claim 1 is characterized in that, two end faces are made by rigid material.

4, combined twisting spring according to claim 1 is characterized in that, the cross section of bar can be rectangle, ellipse or rhombus.

5, combined twisting spring according to claim 4, it is characterized in that, the rectangle of bar cross section, ellipse or rhombus center separately is evenly distributed on the circumference in 360 ° of scopes, and their major axis radially radially distributes along this circumference.

6, combined twisting spring according to claim 1 is characterized in that, bar is made by elastic material.

7, combined twisting spring according to claim 1 is characterized in that, each combined twisting spring is only selected the bar of a kind of shape, size and material for use.

8, combined twisting spring according to claim 1 is characterized in that, torsional stiffness K is:

$K=\frac{P_1\&times;R}{\frac{1}{R}}\&times;n=\frac{{3\mathrm{EIR}}^{2}n}{l^3}=\frac{{\mathrm{nEbh}}^3{R}^2}{{4l}^3}.$

9, combined twisting spring according to claim 1 is characterized in that, thrust load P is:

$P=\frac{{\mathrm{n\&pi;}}^2\mathrm{EI}}{{\left(2l\right)}^2}=\frac{{\mathrm{\&pi;}}^2\mathrm{nEb}{h}^3}{{48l}^2}$

10, combined twisting spring according to claim 1 is characterized in that, the Maximum Torque M that provides is:

$M=n{P}_{1}R=\frac{\mathrm{nRb}{h}^2\left[\mathrm{\&sigma;}\right]}{6l}$

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