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Title:
CUSHION BUFFER
Document Type and Number:
WIPO Patent Application WO/2019/027359
Kind Code:
A1
Abstract:
The present utility model is related to a cushion buffer for a shock absorber spring of a vehicle, such as an automobile. The cushion buffer (1) for the vehicle shock absorber spring comprises an annular open body (2) having a bottom and top ends, and a side wall therebetween, recesses (3) formed on the bottom and top ends of the annular open body for receiving the shock absorber spring, and elliptical through openings (4) formed in the side wall and placed equidistantly from the bottom and top ends, wherein there are six elliptical through openings (4). The technical result is in improving resilient properties of the cushion buffer.

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Inventors:
SOROKIN, Ian Mikhailovich (pr. Novokolomiazhskii, d. 16/8 kv. 16, Saint Petersburg 5, 197375, RU)
Application Number:
RU2018/050092
Publication Date:
February 07, 2019
Filing Date:
August 01, 2018
Export Citation:
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Assignee:
SOROKIN, Ian Mikhailovich (pr. Novokolomiazhskii, d. 16/8 kv. 16, Saint Petersburg 5, 197375, RU)
International Classes:
F16F3/10; B60G11/52
Foreign References:
CN1924390A2007-03-07
CN2813999Y2006-09-06
CN2748698Y2005-12-28
KR20110036659A2011-04-08
Attorney, Agent or Firm:
NILOVA, Maria Innokentievna (BOX-1125, PATENTICASaint Petersburg, 190000, RU)
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Claims:
CLAIMS

1. A cushion buffer (1) for a vehicle shock absorber spring, comprising:

an annular open body (2) having a bottom and top ends, and a side wall therebetween, recesses (3) formed on the bottom and top ends of the annular open body for receiving a shock absorber spring, and

elliptical through openings (4) formed in the side wall and located equidistant from the bottom and top ends,

wherein a number of the elliptical through openings (4) is six.

2. The cushion buffer according to claim 1, wherein the elliptical through openings (4) comprise stiffening ribs (5).

3. The cushion buffer according to claim 2, wherein each stiffening rib is perpendicular to the top and bottom buffer ends.

4. The cushion buffer according to any of the claims 1-3, wherein the cushion buffer further comprises one more elliptical through opening (4).

5. The cushion buffer according to any of the claims 1-4, wherein the cushion buffer is made of material comprising polyurethane.

6. The cushion buffer according to claim 5, wherein the cushion buffer is obtained through hot-casting of two-component polyurethane systems.

Description:
CUSHION BUFFER

FIELD OF THE UTILITY MODEL

The present utility model relates to a cushion buffer, and more particularly to a cushion buffer for a shock absorber spring of a vehicle, such as an automobile.

PRIOR ART

Cushion buffers provide driving comfort and safety, and also allow a substantial decrease in automobile maintenance costs by means of increasing the service life of shock absorbers. The cushion buffers make a car less prone to «dipping» forward while braking hard, inclination and body motion while turning are decreased, and reduce breakdowns of shock absorbers.

KR 20070025561 A (F16F 1/12, B60C 11/14, 08.03.2007) discloses a cushion buffer for a vehicle shock absorber, providing the driving comfort due to preventing a vehicle from inclining to one side while turning, and preventing spring deformation under a strong compressing force. The cushion buffer allows weakening the impact on the vehicle suspension mount. The buffer body has an annular open shape and comprises annular recesses formed on the top and bottom ends for inserting a shock absorber spring therein. There is a plurality of elliptical through openings formed in a buffer side wall for absorbing and distributing the impact, acting on the buffer. A soft material, such as plastic, rubber or soft polyurethane, is used for the buffer.

KR 20110036659 A (F16F 1/12, F16F 1/06, 08.04.2011) discloses a cushion buffer which is generally similar to the above-mentioned buffer, but additionally having air openings 3, 5, and 7. Authors of KR 20110036659 noticed that in case of a heavy shock the above-mentioned buffer doesn't absorb it properly. In order to solve this problem, to elliptical openings already provided there were added air through openings associated with them for evacuating rapidly compressed air in the elliptical openings during a shock.

CN 2748698 Y (F16F 1/371, 12.28.2005) discloses a cushion buffer having an annular open shape and including annular recesses formed on the top and bottom surfaces for receiving a shock absorber spring therein. One or two longitudinal elongate openings are formed in the buffer side wall.

However, it has been found that in operation too many side through openings, e.g. eight or nine, as in the buffers offered by ThinkThinkCar (TTC CO., LTD, KR) and essentially similar to solutions in KR 20070025561 and KR 20110036659, or a few substantially elongated side openings, as in above-mentioned CN 2748698, result in rapid loss of resilience, i.e., the ability to restore initial shape and volume after the compressing forces are removed. First, this is due to the fact that many openings or a few elongated openings entail a large empty space filled with air within the walls of the buffer body, and, in turn, the lacking volume of corresponding resistance and reliance means facilitating the restoration of the initial shape of the buffer. In this regard the number of openings, and more particularly the number of barycenters of the openings, through which the axes extend, wherein load stresses occur along said axes, is important. Rapid loss of resilience almost completely cancels out all the benefits of using the buffer, and consequently, there is a need in its frequent replacement, which entails additional cost.

The present utility model is aimed at solving the above-mentioned technical problem. This problem can be solved through a device claimed in an independent claim of the enclosed utility model claims.

SUMMARY OF THE UTILITY MODEL

A cushion buffer for a vehicle shock absorber spring is provided.

The cushion buffer comprises an annular open body having a bottom and top ends, and a side wall therebetween, recesses formed on the bottom and top ends of the annular open body for receiving a shock absorber spring, and elliptical through openings formed in the side wall and located equidistant from the bottom and top ends, wherein a number of the elliptical through openings is six.

The technical result provided by the utility model is in improving resilient properties of the cushion buffer, that is the ability to restore the initial shape and volume after the compressing force has been removed. This technical result is achieved by providing six elliptical through openings in the buffer wall.

In particular, it has been established that the number of the elliptical openings, that is the number of barycenters, which is six, is an optimal for improving resilient properties of the cushion buffer. According to one of the embodiments, the buffer may comprise one more (the seventh) opening. The use of the additional seventh elliptical opening provides substantially the same results of improved resilience, exceeding the results of technical solutions with eight or more openings and less than six openings.

In a preferred embodiment of the present utility model every elliptical through opening has stiffening ribs formed therein, which additionally facilitate the improved resilient properties of the cushion buffer. According to a preferred embodiment of the present utility model, each stiffening rib is perpendicular to the top and bottom buffer ends.

According to a preferred embodiment of the present utility model, the cushion buffer is made of material comprising polyurethane.

According to another preferred embodiment of the present utility model, the cushion buffer is obtained through hot-casting of two-component polyurethane systems.

BRIEF DESCRIPTION OF THE DRAWINGS

The present utility model is described in detail further through a non-limiting embodiment with a reference to the accompanying drawings, on which:

FIG. 1 shows a perspective view of a cushion buffer according to a preferred embodiment of the present utility model;

FIG. 2 shows a cross-sectional view of the cushion buffer according to the preferred embodiment of the present utility model;

FIG. 3 shows a partial view in a longitudinal section of the cushion buffer according to the preferred embodiment of the present utility model.

The same reference numbers identify the same elements on the drawings.

DETAILED DESCRIPTION OF THE UTILITY MODEL

Before describing the proposed device in detail, it should be noted that it is not limited to the use of specific disclosed components and can be modified. It is also noted, that terms used in the present document are chosen to describe only the disclosed particular embodiments, and are not limiting.

FIG. 1 shows a perspective view of a cushion buffer 1 according to the preferred embodiment of the present utility model. FIG. 2 and 3 show the cushion buffer 1 in a cross- section and in a longitudinal section, respectively. This cushion buffer 1 is intended to be located in a shock absorber spring of a vehicle, in particular, a car. As shown in FIG. 1, the cushion buffer 1 includes an annular open body 2. The annular body 2 is open due to the spiral form of the shock absorber spring. The annular open body 2 has recesses 3 formed in the top and bottom ends thereof for receiving a shock absorber spring, which extend along the entire end and substantially follow the shape of the spring. The annular open body 2 has six elliptical through openings 4 formed in its side wall equidistant from the bottom and top ends. Except for a shape illustrated in FIG. 1, the elliptical through openings 4 may have a cross-sectional form of a circle or a rhombus with concave sides. Each elliptical through opening has a stiffening rib 5 perpendicular to the top and bottom ends of the body 2.

The cushion buffer is preferably made of polyurethane. Polyurethane elastomers are exceptionally durable, and their elongation at break may be 500-1000%. Articles made of polyurethane elastomers are the best substitutes for rubber articles or metal articles. Casting liquid polyurethane into a special mold allows manufacturing articles of high complexity with any geometrical parameters. The technology is based on the high-precision dosage of the mixture components, constant temperature and pressure monitoring throughout the entire process by program controlling. Polyurethane elastomers differ from traditional rubber elastomers in high material strength, low wear rate, high elasticity in a wide hardness range.

The process of manufacturing a cushion buffer is as follows. First, a mold and raw materials are prepared by heating. Then, the raw materials are mixed in a casting machine for two-component polyurethane systems with the operating temperature of the components of 80°C. It is preferred to obtain a polyol and isocyanate prepolymer. In addition, optionally a coloring agent is added. Then, the resultant prepolymer is cast in molds and held at the required temperature until polymerized. Then, it is demolded and post-polymerized. It is important to use hot curing. It provides benefits in strength and chemical stability, as well as wear resistance, as compared to cold curing. Moreover, an item produced by hot-casting of two-component polyurethane systems has the advantage in elasticity over an item produced using granulated polyurethane (or thermoplastic polyurethane). Exposure to hot water (steam) in the result of hydrolysis, chlorine, as well as many organic solvents has a detrimental effect on the latter.

Tests, conducted on the proposed cushion buffer comprising six elliptical through openings having stiffening ribs therein, and a cushion buffer produced by ThinkThinkCar comprising eight elliptical through openings, have demonstrated the following results provided in the table below.

Marking of a Static load Sample Deformation Residual Notes test sample value, kgf height, under load, deformation

mm mm immediately

after unloading,

mm

1 2 3 4 5 6

Prior art 0 42.0 0 -

340 33.0 9.0 -

0 41.3 - 0.7

340 26.6 15.4 -

1000 17.6 24.2 -

0 41.2 - 0.8

1000 (at t = 18.5 23.5 The sample was held at -18°C )

t = -18°C for 2 hours

0 40.8 - 1.2

Cushion 0 44.1 0 - buffer of the

present utility 280 34.7 9.4 - model

0 43.6 - 0.5

280 27.4 16.7 - 1000 18.7 25.4 -

0 43.4 - 0.7

1000 (at 19.6 24.5 The sample t= - 18°C ) was held at t= - 18°C for 2 hours

0 43.1 - 1.0

As seen from the table, the cushion buffer of the present utility model has demonstrated significantly lower residual deformation immediately after unloading in comparison with prior art cushion buffers, which proves the presence of improved elastic properties of the proposed buffer. Improved elasticity provides higher driving comfort and safety, and also allows to significantly reduce cushion buffer wear, thus lowering car maintenance costs and increasing service life of the shock absorbers.