DE1241284B - Leaf spring package for vehicles, especially motor vehicles - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

B62d

German KL: 63 C-40

Number: 1 241 284

File number: N1726411 / 63 c

Filing date: September 18, 1959

Opened on: May 24, 1967

The invention relates to a leaf spring package for vehicles, in particular motor vehicles, which has a number of stacked sheets of different thickness.

The previously known leaf spring packages for vehicles were manufactured in such a way that leaves of the same width were stacked on top of one another were, with the design, the intended load, the available Space and the intended restoring force have been taken into account. It has also already been suggested In the case of thin individual spring leaves, the uppermost leaf layer should be made stronger or the leaves of different widths close.

In all of the known embodiments, however, it has not succeeded with a given restoring force to significantly reduce the weight of the leaf spring package through design measures. Lighter ones Leaf spring assemblies with the same restoring force are, however, for reasons of material savings and the Vehicle weight savings are desirable.

The invention is based on the object of designing a leaf spring assembly so that it is at a given Space requirement and specified restoring force is as light as possible. This task will according to the invention achieved in that at least one sheet is reinforced and at the same time reduced in width is, wherein the width of the spring leaf is reduced in a ratio that is about 2 to 3 times the absolute value of the ratio by which the spring leaf is reinforced.

This achieves an appropriate distribution of the stresses in the leaf spring assembly.

With reference to the drawings, which represent embodiments according to the invention, this is described in more detail.

F i g. Fig. 1 shows an elevation of Devices Nos. 5 and 6 according to this invention;

F i g. Fig. 2 shows a bottom view of the same;

F i g. 3 shows a vertical section of the device no. 6 along the line XX in FIG. 1 and 2;

F i g. 4 shows a vertical section of the same device along the line Y-Y in FIG. 1 and 2;

F i g. Fig. 5 shows a vertical section of device no. 6 along the line XX in Figs. 1 and 2;

F i g. Fig. 6 shows a vertical section of the same device along the line YY in Figs. 1 and 2;

F i g. Fig. 7 shows a vertical section of another device similar to that of Fig. 7. 3 and 5;

F i g. Fig. 8 shows a vertical section of another similar device as in Fig. 3, 5 and 7;

F i g. Fig. 9 shows a plan view of another further device;

Leaf spring package for vehicles,
especially motor vehicles

Applicant:

Nippon Hatsujo Kabushiki Kaisha,

Isogo-machi, Isogo-ku, Yokohama (Japan)

Representative:

Dr. F. Zumstein, Dr. E. Assmann

and Dr. R. Koenigsberger, patent attorneys,

Munich 2, Bräuhausstr. 4th

Named as inventor:

Yukihiro Takatsu,

Isogo-machi, Isogo-ku, Yokohama (Japan)

Claimed priority:
Japan of September 25, 1958 (27 305),
dated April 14, 1959 (11993)

F i g. Fig. 10 shows an elevation of the same;

F i g. 11 shows a vertical section of the same along the line ZZ in FIG. 9 and 10;

FIG. 12 shows a vertical section through a leaf spring assembly with ungrooved leaves; FIG.

Fig. 13 shows a vertical section of another device No. 9;

F i g. Fig. 14 shows a vertical section of another device No. 11;

Fig. 15 shows a vertical section of another device No. 12;

16 shows a vertical section of a spring leaf with groove on an enlarged scale;

Fig. 17 shows an elevation of another device;

Fig. 18 is a bottom view of the same;

Fig. 19 shows a vertical section of the same along the line XX in Figs. 17 and 18;

F i g. 20 shows a vertical section of the same along the line YY in FIG. 17 and 18;

F i g. Fig. 21 shows a vertical section of another device similar to Fig. 19;

Fig. 22 shows a vertical section of the same similarly as in Fig. 20;

F i g. 23 and 24 show vertical sections of still further devices similar to Figs. 19 and 21;

709 587/339

F i g. Fig. 25 shows a plan view of another device;

Fig. 26 shows an elevation of the same;

27 shows a vertical section along the line ZZ in FIGS. 25 and 26, and

Fig. 28 shows a vertical section of another Device similar to Fig. 27.

First, the relationships between the restoring force (C) of the spring, the tension (<5) and the weight (W) are presented.

Restoring force, tension and weight are calculated using the following formulas:

Since V = tbL, it follows for the relative change in V when / is changed,

AVtIVt =
and if b is changed,

t / t

(7)

Restoring force ... C =

Voltage _i; <S =

Weight .: W '=

Ύ '
, Vi .:

(1)

(8th)

From this it follows from equations (6), (7) and (8) A VbIVb = AbIb = ZA t / t = 3 AV _t / V _t .

It is therefore possible to make a spring leaf lighter with a required value of the restoring force if the width b is changed in a ratio which corresponds to 3 times the value of a simultaneous change in the thickness t of the spring leaf.

Exemplary embodiments calculated in accordance with the above equations are listed below.

Here - /; the moment of inertia, E the modulus of elasticity (21000 kg / mm ² ), M the bending gemomerite, L the "span of the spring, f the thickness of the spring leaf, ρ the specific weight and V the volume of the spring leaf. If C and L are given as conditions "can be calculated from equation (1) Ii . The conditions also include the maximum load / Wz and the maximum tensile stress and, accordingly, d _max . Therefore, using equation (2), Mmax can be determined by M - PL / 4. If further b is determined, / can be selected for each spring leaf

the equation / = bt ^3/12 and calculated from η ^) = η I l _t

being found. t and η generally result as not being integers.

Therefore, blades are chosen whose moments of inertia have values close to the above value of t for certain standard sizes, and the practical values of restoring force and tensile stress are calculated by equations (1) and (2). On the other hand, in order to achieve a desired restoring force of the spring, it is of course necessary to combine blades with differently large moments of inertia.

In order to get different values of /, the two dimensions of the spring leaves can be changed. One variable is the thickness t of the sheet and the other is the width b of the sheet.

With regard to the tension, since of course a change in t leads to a change in δ , it is undesirable to change the value of /, while a change in b does not change the value of the tension and thus all sheets have the same tension.

Among the weight ratios: Since I = bt ^3/12, the relative changes when it is changed from t /,

and if b is changed,

Since A hlU = A IbIh , it follows from (4) and (5)

AbJb = 3 A t / t. (6)

(1) Requirements:

span

Restoring force ...
normal load

L = 1300 mm
C = 5 kg / mm
P = 600 kg
maximum load ... P _max = 1100 kg
maximum tensile stress ö _max = 80 kg / mm ²
Blade width b = 70 mm

(2) Calculation:

From equation (1):

^ h = Iβ / 32E- C = 1300 ³ / (32 * 21000) * 5 = 16360.

From equation (2):

t = 2 ^ jh / M = 2 x 16360 / (1100 x 1300/4) x 80 = 7.3.

It follows:
I = bt ³ ß

I = 70 x 7.3 ^3/12 = 2270,
from 2 // < = nl η = 16360/2270 = 7.2.
For this, the following six exemplary embodiments:

Execution
example sheet
No. t / ³ b ' Σ ' 5o 1 Ibis 7 7th 343 70 2000 14000 2 Ibis 8 7th 343 70 2000 16000 ³ { Iund2
3 to 7 8th
7th 512
343 70
70 2990
2000 j 15980 55 4 j 1,2,3
4 to 7 8th
7th 512
343 70
70 2990
2000 } 16970 ⁵ { Iund2
3 to 7 OO OO 512
512 70
50 2990
2135 1 16660 ⁶ { Ibis 5
6 and 7 OO OO 512
512 50
70 2135
2990 j 16660

Since the desired ^ k is equal to 16360, the desired spring can be obtained by taking a value

for ^ jIi that comes closest to the above value is selected. Accordingly, devices # 2, 3, 4, 5, and 6 would be suitable. On the other hand, No. 2 (in accordance with known

Systems) are excluded because of the oversize of the leaves. No. 4 agrees with the known System (which will continue to be referred to as the "original"). Nos. 5 and 6 are accordingly This invention has lighter leaf springs compared to the original No. 4. However, No. 6 owns Sheets 6 and 7, which are 8 mm thick and 70 mm wide, especially because No. 6, if it weren't so,

would not reach the value for ^ It.

While both No. 5 and No. 6 would originally have a thickness t = 7 mm and a width b = 70 mm, they are modified so that their thickness is t - 8 mm and their width b = 50 mm. In this case the ratio of the decrease in width b is 29%> the absolute value of the same is about twice the increase in thickness of 14%

Further, the voltage is calculated from equation (2).

Execution
example { sheet
No. t-b ψ tension
kg / mm ² 4th { 1, 2 and 3
4 to 7 8-70
7-70 84.3
73.7 5 I. Iund2
3 to 7 8-70
8-50 86.2
86.2 6th Ibis 5
6 and 7 8-50
8-70 86.2
86.2

In the above embodiments, Nos. 5 and 6 have evenly distributed stresses and are more rational.

In order to compare these exemplary embodiments in terms of weight, their volume t * b * L is tabulated below. .

sheet 4th Embodiment 5 6th 4 and 5 4 to 6 No. 560L ₁ 560L ₁ 400L ₁ 0 160L ₁ 1 560L ₂ 560L ₂ 400L ₂ 0 160L ₂ 2 560L ₃ 400L ₃ 400L ₃ 160L ₃ 160L ₃ 3 490L ₄ 400L ₄ 400L ₄ 90L ₄ 90L ₄ 4th 490L ₅ 400L ₅ 400L ₅ 90L ₆ 90L ₅ 5 490L ₆ 400L _e 560L ₆ 90L ₆ -70L ₆ 6th 490L, 400L ₇ 560L, 90L ₇ -70L ₇ 7th

Another embodiment of this invention is shown in FIG. 8, in which sheets Nos. 3 and 4 are narrower than numbers 1, 2, 5 and 6.

FIGS. 9 to 11 show a further embodiment according to the invention, wherein an auxiliary spring 21 is attached to a main spring 20. In this case possesses, although the springs are formed in a known manner, i. i.e., the feathers have leaves of the same Width, the auxiliary spring 21 one of the main spring 20

According to this invention, different widths, that is, the auxiliary spring 21 is narrower than the main spring 20. FIG. 12 shows a further exemplary embodiment similar to that just described, but in this case the main spring is narrower than the auxiliary spring 21. The Reference symbols 1, 2, 3, 4, 5, 6 and 7 indicate the spring leaves no. 1, 2, 3, 4, 5, 6 and 7 in these exemplary embodiments. Near the center line ZZ , the sheets No. 1 to 6 are all connected to one another by means of a clamp 11 and a pin 13, as in FIG. 3 shown connected to each other. Leaves 1, 2 and 3 are connected to one another by means of a clamp 12 near one end. The brackets 11 and 12 can according to the cross-section of the leaves, as shown in FIG. 3 and 4 shown, be bent. On the other hand, a rubber pad 15, which functions as a buffer, can be inserted between the clamps 11 and 12 and the narrower leaves, as shown in FIGS. 6 and 8. In a further embodiment, retaining strips 16 can be attached to the bolts 13 so as to hold the narrower first and second sheets 1 and 2 at their edges, as in FIG. 5 and 7 is shown to hold and consolidate in its position.

According to the invention, a leaf which is arranged in a leaf spring of the type described can have an elongated groove. It has been found that a sheet which is narrower and has a groove 30 can be made lighter than a wider sheet which does not have a groove 30 when a weight ratio is calculated to obtain a restoring force depending on the springs each have the same moment of inertia I. The table below shows some examples of this fact. In these cases, the same geometric moment of inertia is required.

As can be seen from the table above, No. 5 and 6 are much lighter than No. 4.

L ₁ is 1300mm, L ₂ is 1300mm, L ₃ is 1100mm, L ₄ is 900mm, L ₅ is 700mm, L ₆ is 500mm, and L ₇ is 300mm. The weight of the leaf spring according to embodiment 4 is set to 100%, the weight decrease of the leaf springs according to embodiment 5 and 6 is as follows:

Weight percent

No. 4
No. 5
No. 6

100

70.5

Flat steel
_so fb length | Wkg / lfm

7-70
8-70
9-70

2000
2990
4250

3.75
4.28
4.81

Leaves, differently wide

and grooved
tb I W%

8-60

9-60

10-60

about 82 about 82 about 82

Embodiment 5 according to this invention is shown in Figs. 1 to 4 and the embodiment 6 in FIGS. 1, 2, 5 and 6 shown. A Another embodiment of this invention is shown in FIG. 7, in which sheets No. 1, 2, 5 and 6 are narrower than numbers 3 and 4. Another thing is a spring leaf, which has an elongated groove 30 possesses, has an increasing compressive stress on the pressure side, is preferred in view of on the rebound of the spring, the recess of an elongated groove 30 in the first spring leaf 1 or avoided in the first and second spring leaves 1 and 2. As shown in the exemplary embodiments in F i g. 14 and 19 can be seen, the different widths of the grooved spring leaves can advantageously from third spring leaf to be applied.

Subsequently, the exemplary embodiments of spring leaves that have a groove are intended to be mathematical to be discussed.

The geometric moment of inertia is

/ = 0.816 -bt ^z / l2,

and the distance between the tension side and the neutral axis NN (Fig. 16) is h = 0.455 /. Therefore, the tension of the spring leaf, which has an elongated groove,

δ = Μ / Σ h 0.455 t.

If a desired value for the restoring force of the spring is invariable, if a flat steel is formed into a spring bed with a groove, the discussion depends on the constant value of the moment of inertia /. The invariable thickness and width are denoted by t ₀ and b ₀ , respectively.

For b = b ₀

0.816 (t / t ₀ ) ³ = 1,
from it

t / t ₀ = 1.07.

Therefore the area A b ₀ · 1.07 1 ₀ - bJ3 · 1.07 / 2 · t ₀ = (5.35 / 6 Vo = 0.891 Vo-

Accordingly, the weight is reduced.
The tension of a spring leaf with a rectangular cross-section is

Here / is the moment of inertia, E is the modulus of elasticity 21,000 kg / mm ² , M is the bending moment, L is the span of the spring, t is the strength of the spring leaf, ρ is the specific weight and V is the volume of the spring leaf. Among these values, C and L are as

Condition provided. ^ / «Becomes from equation (9)

obtained in case (1) of the previous examples. The maximum load P _m ax and the corresponding train

ίο the maximum load ö _max are also given as a condition. M _max can therefore be taken from the previous exemplary embodiments. The value of / is determined by equation (10) or (10 '). If now b is also determined, I _G for each spring leaf can be derived from the equation

I _G = 0.816 · 6i ^3/12

can be determined, whereas Ir for a right-angled cross-section of the spring leaf from the equation

Jr =

³ °

where 2 h ^un & M are constant.
thats why
<3 / <5 ₀ = 0.455 t (t _o / 2) = 2-0.455 -1.07 = 0.973.

Since it is not necessary to decrease the tension, t = t _o / 2 can be set for 0.455, and t is increased while b decreases by keeping I constant.

With 0.455 t = t _o / 2 it follows t = 1.1 t ₀ and

Σ / = 0.816 * [b * (1.1 / ₀ ) ³ ] / 12 = 1.085 * bt _o ^a / 12.

If b is decreased so that I - I ₀ , then 1.085 b = b ₀ and then b = 0.921 b ₀ .
Hence the area is A.

0.921 b ₀ · 1.1 1 ₀ -; o.921 / 3 · b ₀ · 1.1 / 2 · t ₀ = 0.844 V ₀ .

Therefore, the weight can be reduced to 89.1% if the width is not changed while it can be reduced even further to 84.4% if the width is changed.

In the following, the relationships between restoring force C, tension δ, weight W etc. of a leaf spring composed of spring leaves, each of which has a groove, will be represented mathematically and described with reference to the figures shown in the drawings. Here is the restoring force

C = 3 ^ Ii-E / L ³ (9)

the tension of a spring leaf with a rectangular cross-section

Ö _R = M / ^ Ii-t _R / 2 (10)

Tension of a spring leaf with a grooved cross-section

ö _G = M / ^, Ii-t _G / 2.2 (10 ')

weight

W = Q-Vi (11)

as previously described, can be calculated. The value for η can then be derived from the equation

can be determined, t and η are generally not integers. There are three possibilities for combined spring leaves that have different values for the moment of inertia I : in one case only spring leaves with a rectangular cross-section are combined, in the second case spring leaves with a rectangular cross-section and grooved cross-section are combined, and in the third case only spring leaves are combined combined with a grooved cross-section. The first case has already been discussed above. The other two cases are discussed below.

The purpose of using grooved cross-section spring leaves is to make them lighter. It is known that the weight of a spring leaf with a grooved cross-section is approximately 89% of that of a spring leaf with a rectangular cross-section if the values / and b remain the same. In practice, it is difficult to reduce the weight of the spring leaf below 89% because the value of / is not calculated as an integer. If the value of b is variable, it is possible to choose a dimension that is not limited to a certain value of /, and it is thus possible to reduce the weight of the spring leaf.

The volume of a spring leaf with a grooved cross-section Vg is as follows:

Va = (bt- bjn ■ i / 2) L = (I- 1/2 n) btL. (12)

Hence Iq = 0.816 * bt ^z / 12, which is the relative change of 7 when / is changed

Δίβψβί = 3 Δ t / t
and when changing b

(13)

(14)

with Δ Ig t / I _G t = AI _G b / I _G b follows from (13) and (14) necessary

Δ b / b = 3 A t / t.

(15)

ίο

ίο

From equation (9) it follows that V _G changes when t changes

AVatlV _o t = At / t (16)

and when changing b

AV _G b / V _G b = Ab / b. (17)

Therefore, from equations (15), 16) and (17), A Vg b / V _G b = A b / b = 3 At / t = 3 AV _G t / V _e t.

According to these embodiments, it is possible to make a spring leaf lighter with a required value of the restoring force if the width b is changed in a ratio which is three times the simultaneous change in the strength t

(2) calculations:
From equation (9)

Σ I = ₁ L ³ / EC 32 = 1300 ³ / (32 · 21000) · 5.5 = 18000 From equation (10):

t _R = I ^ UÖrIM = 2 x 18000 / (1100 x 1300/4) x 80 = 8.05. From equation (10 '):

t _G = 2.2 ^ IiöalM = 2.2 x 18000 / (1100 x 1300/4) x 80 = 8.8. From it

I _R = bt ³ ll2 = 70 · 8.05 ^3/12 = 3045 and

Ig = 0.816 · bt ^3/12 = 0.816 × 70 × 8.8 ^3/12 = 3240. With

corresponds, similarly as previously mentioned in connection with the exemplary embodiments cited became.

Exemplary embodiments are then calculated in accordance with the above equations.

(1) Requirements: L = 1300 mm span Restoring force of C = 5.5 kg / mm feather η 600 kg; normal load ... Pmax - 1100 kg maximum load .. Omax - 80 kg / mm ² maximum voltage .. b = 70 mm Width of the spring leaf

is

n _R = 18000/3045 = 5.9,

n _G = 18000/3240 = 5.55.

From it results for r Sheet number. six embodiments t the following: f ⁸ b 3500 } Σ ' Execution
example \ Ibis 6 Cross-section type 9 729 70 3500 1 21000 7th j Ibis 3 grooved 9 "729 """' 70 3500 J 17890 _8th \ 4 to 6 grooved 8th 512 70 3500 } JL / OJ * \ J ( Ibis 3 grooved 9 729 70 2510 \ IQf) -JfV \ 4 to 6 grooved 9 729 50 2990. J XoUjU Iund2 grooved 8th 512 70 . 2440 \ 18180 10 ι 3 to 7 right angled 8th 512 70 2990 J JLO JLOV / J 1 grooved 8th 512 70 2970 17840 11 \ 2 to 6 right angled 9 729 60 3640 JL JL Ibis 3 grooved 9 729 60 2440 18240 1? 4 to 6 right angled 8th 512 70 JL O J ^ T \ J, JL-c. grooved

Of these embodiments, 7, 8 and 10 are in accordance with known spring leaves, while 9, 11 and 12 are in accordance with this invention, 9 being represented by FIG. 13, 11 through FIGS. 14 and 12 are represented by FIG.

Regarding the required moment of inertia

^ / i = 18000 it is determined that the embodiments 8, 9, 10, 11 and 12 would be suitable. On the other hand, 10 can be excluded, since this exemplary embodiment is composed of seven sheets. Among the remaining four embodiments 8, 9, 11 and 12, 8 is in accordance with previously known Embodiments referred to as "original", while the other embodiments according to the invention are. A comparison of the last three examples

709 587/339

games with the "original" example is given below:

Execution ί sheet 3 9-70 t · A tension example 1 No. 6th 8-70 * U kg / mm ² Q ί Ibis 3 9-70 grooved 82. O 1 4 to 6th 9-50 grooved 73 ί Ibis 9-70 grooved 81 y 1 4 to 6th 9-60 grooved 81 11 ί 1 3 9-60 right angled 80 Ii 1 2 to 6th 8-70 grooved 82 1 O Ibis right angled 88 ■ 12 4 to grooved 71

In view of the uniform voltage, it should be noted that Embodiments 9 and 11 the best are.

The exemplary embodiments listed above are compared with one another with regard to their weight.

8th Embodiment 11 12th Sheet number. kg / m 9 kg / m kg / m 4 -10 -L ₁ kg / m 4 · 28 · L ₁ 4-11-L ₁ 1 4-10-I ₂ 4 · 10 · L ₁ 3-51-L ₂ 4-11-L ₂ 2 4 · 10 · L ₃ 4 · 10 · L ₂ 3-51-L ₃ 4-11-L ₃ 3 3 · 64 · L ₄ 4 · 10 · L ₃ 3 51 L ₄ 3- 64-L ₄ 4th 3-64-L ₆ 2 92 L ₄ 3-51-L ₅ 3-64-L ₅ 5 3 · 64-L ₆ 2 92-L ₅ 3-51-L ₈ 3-64-L ₆ 6th 2-92-L ₆

L ₁ = 1300 mm, L ₂ = 1300 mm, L ₃ = 1050 mm, L ₄ = 800 mm, L ₁ = 550 mm and L ₆ = 300 mm, and the weight of the "original" spring leaf no.8 is 100 % Based on this, the weights of the spring leaves according to the other exemplary embodiments are as follows:

Fig. 15 shows the embodiment 12, which of three sheets No. 1, 2 and 3, which are narrow but not grooved, and three broad, grooved leaves No. 5, 6 and 7 consists. The arrangement of a groove in each of these blades is shown enlarged in FIG.

Further embodiments are shown in FIGS. 17 to 20 show a leaf spring, whose leaves no. 3 to 6 are narrow and grooved.

19 and 20 are vertical sections along the lines XX and YY in FIGS. 17 and 18. FIGS. 21 and 22 are vertical sections of a further embodiment, also essentially along the lines XX and YY in FIGS Figure 3 shows an elevation and a plan view of the latter embodiment. F i g. 23 and 24 show further embodiments in vertical sections corresponding to FIGS. 19 and 21. In the FIG. 23 embodiment shown, all sheets are grooved as well as the

ao sheets No. 1, 2, 5 and 6 narrow. In the case of the one shown in FIG. 24 shown embodiment, all sheets with the exception of No. 6 are grooved, and sheets No. 3, and 5 are narrow.

The F i g. 25 to 28 show embodiments in which an auxiliary spring 21 in addition to a Main spring 20 is provided. Fig. 27 shows a Embodiment in which the spring leaves of the auxiliary spring 21 are narrow and all the spring leaves Auxiliary spring as well as the main spring are grooved.

Fig. 28 shows an apparatus in which the spring leaves the main spring are narrow and grooved. The F i g. 25 and 26 represent a floor plan and one Elevation of the latter two embodiments.

Execution weight weight example kg % 8th 21.0 100 9 19.8 94 11 18.0 86 12th 21.0 100

35

40

45

The above table shows that there is a remarkable reduction in the Weight can be achieved. It should also be noted that embodiment 12 is not lighter than the known embodiment, since this embodiment has blades that have a heavy, have a rectangular cross-section, while with a combination of sheets with rectangular cross-section and grooved cross-section in a suitable manner, as in embodiment 11, a considerable reduction in weight can be achieved, as the table shows.

In the drawings, FIG. 13 shows the embodiment 9, which is made up of the wide sheets No. 1, 2, 3 and from the narrow sheets nos. 4, 5 and 6, all of which are grooved to reduce their weight, consists. Fig. 14 shows the embodiment 11, which consists of a wide sheet No. 1 and narrow Sheets # 2 through 6 are made, the latter five sheets being grooved to reduce weight.

Claims (17)

Patent claims: 1. Leaf spring package for vehicles, especially motor vehicles, which has a number of stacked Having sheets of different thickness, characterized in that at least one sheet is reinforced and at the same time reduced in width, the width of the Spring leaf is reduced in a ratio that is about 2 to 3 times the absolute value of the ratio by which the spring leaf is reinforced. 2. Leaf spring package according to claim 1, characterized in that the fixed support between the narrower leaf springs and the clamp (12) in a known manner a rubber pad (15) is inserted (Fig. 6, 22, 24). 3. Leaf spring package according to claim 1 and 2, characterized in that in addition to the two top leaves (1, 2) of the stack all other spring leaves reinforced and at the same time in their Width can be reduced, the width of each of these spring leaves reduced in proportion which is about 2 to 3 times the absolute value of the ratio by which the spring leaf is amplified is (Fig. 3, 4). 4. leaf spring package according to one of claims 1 to 3, characterized in that all spring leaves except for the three lowest (4, 5, 6) of the stack is reinforced and at the same time their width is reduced, wherein the width of each of these spring leaves (1, 2, 3) is reduced in a ratio that is approximately 2 to 3 times the absolute value of the ratio by which the spring leaf is reinforced (Fig. 15). I ZÖ4 ; hes 5. Leaf spring package according to one of claims 1 och to 3, characterized in that the two the top (1,2) and the two bottom (5,6) : in spring leaves of the stack each are reinforced larr and at the same time its width is reduced, whereby the width of each of these spring leaves is reduced in a gs ratio that is about 2- to 1, 3 times the absolute value of the ratio to id. that the spring leaf is reinforced is (Fig. 23). len 6. Leaf spring package according to one of claims 1 up to 3, characterized in that the four Its spring leaves of the stack with the exception of the en the lowest spring leaf are reinforced and at the same time their width is reduced, the width ; s- each of these spring leaves in a ratio is reduced, which is 2 to 3 times the absolute id value of the ratio by which the spring leaf ; n is amplified is. ie 7. Leaf spring package according to one of claims 1 ! 4 to 3, which consists of a main spring and an auxiliary spring, ao it which is arranged above, consists of both 3, a stack of several spring leaves on top of one another, characterized in that :, at least one of the spring leaves of the main spring r (20) or the auxiliary spring (21) reinforced and equal timely its width is reduced, the width r of the spring leaf is reduced in a ratio r is about 2 to 3 times the absolute The value of the ratio by which the spring leaf is reinforced is (FIG. 9, 10, 11, 12). : 8. leaf spring package according to claim 7, characterized characterized in that the spring leaves of the main spring reinforced and at the same time the width be reduced, the width of each of these spring leaves being reduced in a ratio that is about 2 to 3 times the absolute value of the ratio by which the spring leaf amplifies is (Fig. 12). 9. leaf spring package according to claim 7, characterized in that the spring leaves of the auxiliary spring be increased and at the same time decreased in width, the width of each of these Spring leaves is reduced in a ratio that is about 2 to 3 times the absolute value of the Ratio by which the spring leaf is reinforced is (FIG. 11). 10. leaf spring package according to claim 1, characterized in that at least one of the spring leaves is increased and at the same time the width is reduced, the width of the spring leaf is decreased in a ratio that is about 2 to 3 times the absolute value of the Ratio by which the spring leaf is reinforced, and at least one of the spring leaves has an elongated groove on its underside in a manner known per se (FIG. 13). 11. leaf spring package according to claim 10, characterized in that at least one of the spring leaves is increased and at the same time the width is reduced, the width of the spring leaf is reduced in a ratio that is about 2 to 3 times the absolute value of the ratio, by which the spring leaf is reinforced, and at least one of the spring leaves besides the uppermost along its underside has a groove (Fig. 14). 12. Leaf spring package according to claim 10, characterized in that at least one of the spring leaves is reinforced and at the same time the width is reduced in a ratio that is about 2 to 3 times the absolute value of the ratio by which the leaf spring is reinforced, and each of these spring leaves is provided with a groove along its underside (Fig. 27). 13. Leaf spring package according to claim 10, characterized in that all the spring leaves except the two uppermost are reinforced and at the same time narrowed in width and with an elongated Groove are provided, the width of the spring leaves is reduced in a ratio that is about 2 to 3 times the absolute value of the ratio by which each spring leaf is reinforced (Fig. 19). 14. Leaf spring package according to claim 12, characterized in that the two uppermost spring leaves of the stack can be reinforced and at the same time reduced widthwise, the width of each of these Spring leaves is reduced in a ratio that is about 2 to 3 times the absolute value of the ratio by which the spring leaf is reinforced, and each of the three spring leaves with an elongated groove is provided (Fig. 22). 15. Leaf spring package according to claim 12, characterized in that the two topmost and the two bottom spring leaves of the stack reinforced and at the same time reduced in width the width of each of these spring leaves being reduced in a ratio that is about that 2 to 3 times the absolute value of the ratio by which the spring leaf is reinforced, and each of said spring leaves has an elongated groove (FIG. 23). 16. Leaf spring package according to claim 12, characterized in that the four lowermost spring leaves, with the exception of the very bottom spring leaf, reinforced and at the same time broadly be reduced, the width of each of these spring leaves being reduced in a ratio about 2 to 3 times the absolute value of the ratio by which the spring leaf amplifies is, and each of the spring leaves mentioned, with the exception of the lowest, with one elongated groove is provided. 17. Leaf spring package according to claim 7, characterized in that at least one spring leaf of the Auxiliary spring is reinforced and at the same time the width is reduced, the width of the spring leaf is reduced in a ratio that is about 2 to 3 times the absolute value of the Ratio by which the spring leaf is reinforced, and each of the said spring leaves is provided with an elongated groove (Fig. 27). Considered publications: German Patent Nos. 496 607, 515 817, 318, 945 610; Austrian Patent No. 135 504; U.S. Patent No. 2,695,780; Big and Teaching, "The Feather", VDI-Verlag, Berlin 1938, p. 59. 1 sheet of drawings