CN201723632U - Spring with variable stiffness - Google Patents

Abstract

The utility model discloses a spring with variable stiffness. The existing spring has the disadvantages of low variation of stiffness, poor compactness of installation and working and small stroke. The spring with variable stiffness is spiral, and is characterized in that at the axis direction thereof the stiffness of working rings in the middle of the spring is lower than that of working rings at the other parts so that when both ends of the spring bear certain pressure, the working rings in the middle come in contact with each other in an axial direction and then become supporting rings so as to divide the spring into two parts. Furthermore, the diameters of the working rings of the spring are gradually reduced from the middle to both ends; and difference between the diameters of two adjacent working rings positioned at both ends at least doubles the diameter of a spring steel wire so that when pressed the working rings can be surrounded together without axially coming in contact with one another. Therefore, the purposes of varying the stiffness, minimizing the space and maximizing the stroke are achieved.

Description

Variable rate spring

Technical field

The utility model relates to a kind of spring, specifically is variable rate spring, changes the variation that rigidity adapts to load when being used for load variations and reaches rational support and buffering effect.

Background technique

As one of important spare part and safety member, its major function shows as and supports tare and damping effect bearing spring in automobile suspension system.

The automobile industry competition that is growing more intense, each automobile main frame maker constantly promotes the riding comfort of vehicle and the handling of vehicle is captured sale of automobile market.Automobile is had higher requirement undoubtedly to the bearing spring as one of important spare part when pursuing superior function, and traditional spring design can't have been satisfied the demand the high-end market on function and usage space.

Yet there is following defective in existing spring:

1, rigidity no change, be difficult to adapt to vehicle in the middle of running process along with road conditions constantly change and vehicle-mounted heavy burden, promote vehicle riding comfort to greatest extent, improve vehicle swerve, stable handling when braking.

2, the compact type of installation and work is poor, is difficult to satisfy the compact design of the height and the spring periphery component of continuous reduction between vehicle body and the suspension system.

3, stroke is little, when highly constantly reducing between vehicle body and the suspension system, is difficult to guarantee that enough strokes avoid vehicle that the end and locking phenomenon take place to sit when motion.

The model utility content

The technical assignment of the technical problems to be solved in the utility model and proposition is to overcome existing spring rate to change the defective that compact type is poor, stroke is little little, that install and work, and variable rate spring is provided.For this reason, the utility model is by the following technical solutions:

Variable rate spring, it is shape in the shape of a spiral, it is characterized in that on its axial direction, being positioned at the intermediate portion building ring rigidity less than the rigidity of the building ring at all the other positions with the building ring of intermediate portion when the both ends of the spring bearing certain pressure axially contact become bracing ring and spring divided and do two sections.

As the optimization technique measure, the diameter of described spring building ring diminishes to two ends gradually from the intermediate portion.Especially, the diameter that is positioned at adjacent two building rings of two-end part differs the diameter of Spring Steel Wire of twice at least so that these building rings do not produce axial contact and can be looped around together during pressurized; Being used for axially, contact becomes the building ring of bracing ring greater than a circle.

As the optimization technique measure, be used for axially contacting on the building ring that becomes bracing ring being with sheath.Especially has the slit that is positioned at spring building ring inboard on the described sheath; Offer some through holes that are positioned at towards the adjacent springs building ring on the described sheath.

The beneficial effects of the utility model are:

1, become rigidity---vehicle along with road conditions constantly change and vehicle-mounted heavy burden, promotes vehicle riding comfort to greatest extent in the middle of running process, improve vehicle swerve, stable handling when braking.

2, the space minimizes---satisfy the compact design of the height and the spring periphery component of continuous reduction between vehicle body and the suspension system.

3, stroke maximization---when highly constantly reducing between vehicle body and the suspension system, guarantee to have enough strokes to avoid vehicle that the end and locking phenomenon take place to sit when motion.

Description of drawings

Fig. 1 is the schematic representation that a kind of structure of the utility model variable rate spring is in free state.

Fig. 2 is the schematic representation that variable rate spring shown in Figure 1 is in half cargo condition.

Fig. 3 is the schematic representation that variable rate spring shown in Figure 1 is in full load condition.

Fig. 4 is the right elevation of Fig. 1.

Fig. 5 is the structural representation that can be placed in the sheath on the variable rate spring shown in Figure 1.

Fig. 6 is that the A-A of Fig. 5 is to sectional view.

Fig. 7 is the stereogram of sheath shown in Figure 5.

Number in the figure explanation: 1-variable rate spring, 2-sheath, 3-slit, 4-through hole, o-o-axial direction, the building ring of L-intermediate portion, the diameter of D-spring building ring, the diameter of d-Spring Steel Wire.

Embodiment

Below in conjunction with Figure of description the utility model is described further.

Variable rate spring 1 of the present utility model, shown in Fig. 1-4, it makes helical by Spring Steel Wire, characteristics be the rigidity of the building ring L that is positioned at the intermediate portion on the axial direction o-o of spring less than the building ring of the rigidity of the building ring at all the other positions intermediate portion with in the both ends of the spring bearing certain pressure time axially contact become bracing ring and spring divided and do two sections.

Rigidity formula according to spring:

$F^{\&prime;}=\frac{F}{f}=\frac{{\mathrm{<figure-callout\; id="4"\; label="Gd"\; filenames="HDA0000022187600000021.png,HDA0000022187600000023.png"\; state="\{\{state\}\}">Gd</figure-callout>}}^4}{8D^{3}n}$

In the formula,

The F-load;

The f-amount of deformation;

G-raw material shear modulus;

D-Spring Steel Wire diameter;

The D-mean diameter of coil;

The n-building ring.

When spring as shown in Figure 1 was in free state and spring is in half cargo condition as shown in Figure 2, all working circle all can produce resiliently deformable, and this moment, the building ring of elastically deformable was maximum, and therefore, the rigidity of spring is little; When spring was in full load condition as shown in Figure 3, the building ring L of intermediate portion axially contact became bracing ring and divides two sections in work with spring, and the minimizing of the building ring of elastically deformable, and therefore, the rigidity of spring increases.Promptly this spring makes mesosphere become bracing ring automatically along with the increase of load, and a spring becomes two springs up and down, has realized the two-man act function, realizes stiffness variation simultaneously, has improved the riding travelling comfort of vehicle.

As further improving and replenishing to technique scheme, the utility model also comprises following additional technical characteristics, though Fig. 1-4 has comprised the major part in following all additional technical features, it is preferred embodiment of the present utility model, but the utility model is not limited to this situation, according to specifically acting on they is selected for use on the described technological scheme of epimere when implementing the utility model:

The diameter D of spring building ring diminishes to two ends gradually from the intermediate portion, the rigidity of building ring L that realizes being positioned on the axial direction o-o of spring the intermediate portion thus is less than the rigidity of the building ring at all the other positions, and according to above-mentioned spring rate formula, the rigidity of whole spring building ring increases to two-end part gradually from the intermediate portion.Especially, the diameter that is positioned at adjacent two building rings of two-end part differs the diameter d of Spring Steel Wire of twice at least so that these building rings do not produce axial contact and can be looped around (referring to Fig. 3,4) together during pressurized, increases the dilatation amount of spring; Be used for building ring that axially contact becomes bracing ring greater than a circle, so that have stable supporting effect when forming building ring.

Be used for axially contacting on the building ring that becomes bracing ring being with sheath 2 (as the TPU pillar, referring to Fig. 5-7), can under full load condition, avoid interfering and abnormal sound, form the collision between the working drawing steel wire of support figure when preventing to compress and cause the spring early fracture, and the increase of noise when avoiding work, and when vehicle driving, prevented the impact of sandstone to spring main body surface.Especially, has the slit 3 that is positioned at spring building ring inboard on the sheath 2, offer some through holes 4 that are positioned at towards the adjacent springs building ring on the sheath 2, so as the distortion that telescopic spring when distortion sheath can be consistent with Spring Steel Wire along with the Spring Steel Wire distortion, life-saving.

Variable rate spring of the present utility model, for realize becoming rigidity, the space minimizes and the maximized target of stroke, at first, consider from installing space, design determines that the overall structure of spring is middle convex (is the external diameter of spring intermediate portion big and diminish gradually to two ends), this structure guaranteed spring under the vehicle unloaded state with not the interfering of vehicle body and vehicle bridge link position periphery component (oil line pipe, steel body component etc.); Secondly, become rigidity,, thereby change the variation freely that bracing ring is realized rigidity at certain loading scope inner spring self building ring by utilization continuous variation along with sprung weight in movement process for being implemented in no any secondary spring element; At last, it in movement process the interference of avoiding spring and body part, can realize simultaneously the variation of rigidity again, when finally the rigidity of the building ring by the spring intermediate portion has not only guaranteed the variation of spring rate but also prevent that less than the rigidity of the building ring at all the other positions vehicle from moving under full load condition and the interference of other parts of car body.

Variable rate spring of the present utility model, when having replaced common spring to realize becoming rigidity by the assistant spring element, the space and the light-weight design of car load design farthest are provided, and this product is a integrated change rigidity, lightweight, stroke is the multi-purpose vehicle(MPV) bearing spring of one greatly.

Therefore, tare increases or jolts when travelling, and spring carries out stiffness variation along with the variation of loading by automatic change centre circle number of end coils realization two-man act function.

As an example, variable rate spring of the present utility model, can adopt following technical order:

The rigidity of single spring: R1=18.5 ± 1.0N/mm;

Stack becomes the rigidity of two-man act: R2=28.0 ± 2.0N/mm;

Design load: 1957.0 ± 79.0N;

Working stroke: 〉=208mm;

Fatigue life: 200,000 times;

The variable rate spring of this technical order, in vehicle, play in support and the damping effect, because the function that can be automatically changeb to two-man act is arranged self, therefore, when vehicle travelled under smooth or the lighter situation of bearing a heavy burden, function and rigidity that spring just plays single spring were work in the 18.5N/mm scope; When on the road surface that vehicle driving is being jolted or when overwork, when in a single day spring stress surpasses design load 1957N, spring mesosphere automatic axial contact card closes, and at this moment changing two springs and stack rigidity into is that 28.0N/mm supports jolting of tare and buffering vehicle.

Spring can both be adjusted rigidity freely under any working environment, thereby farthest improves vehicle riding comfort.In addition, it is exactly that working stroke surpasses 208mm that spring also has a characteristic, and general rear coil springs stroke is not wait about 100-180mm.Enough big working stroke makes vehicle that enough spatial motions all be arranged under any operating conditions, has avoided vehicle to sit the generation of end phenomenon.

Claims (7)

1. variable rate spring, it is shape in the shape of a spiral, it is characterized in that the rigidity of the building ring (L) that is positioned at the intermediate portion on its axial direction (o-o) less than the building ring of the rigidity of the building ring at all the other positions intermediate portion with in the both ends of the spring bearing certain pressure time axially contact become bracing ring and spring divided and do two sections.

2. variable rate spring according to claim 1 is characterized in that the diameter (D) of described spring building ring diminishes to two ends gradually from the intermediate portion.

3. variable rate spring according to claim 2, the diameter that it is characterized in that being positioned at adjacent two building rings of two-end part differ the diameter (d) of the Spring Steel Wire of twice at least so that these building rings do not produce axial contact and can be looped around together during pressurized.

4. variable rate spring according to claim 2, it is characterized in that being used for axially, contact becomes the building ring of bracing ring greater than a circle.

5. according to each described variable rate spring among the claim 1-4, it is characterized in that being used for axial the contact on the building ring that becomes bracing ring and be with sheath (2).

6. variable rate spring according to claim 5 is characterized in that having the slit (3) that is positioned at spring building ring inboard on the described sheath (2).

7. variable rate spring according to claim 5 is characterized in that offering on the described sheath (2) some through holes (4) that are positioned at towards the adjacent springs building ring.

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