DE1238278B - Suspension body made of open-cell elastic material - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

F16f

German KL: 47 a -17

Number: 1238 278

■ File number: L 45337 XII / 47 a

Filing date: July 12, 1963

Opened on: April 6, 1967

The invention relates to an open cell elastic material, in particular polyurethane plastic, existing spring body. As a result of their cell structure, these highly elastic suspension bodies have a progressively increasing shape Spring characteristic and therefore show a favorable suspension behavior. They are primarily used as auxiliary springs Can be used with advantage in vehicle construction. The internal compressibility of the cell-elastic Material is very large and therefore only allows a small amount of travel for the intended spring travel Overall height of the spring body, so that it can be accommodated cheaply. Likewise affects the result of the Cell structure achievable weight reduction of the spring body everywhere advantageous.

In such suspension bodies, it is known to cover the cell-elastic core with a layer of air-impermeable, to encase elastic material in order to protect the spring core against the ingress of dirt and other harmful foreign matter protection. It is already provided that the cladding layer to change the spring characteristics to use. In the known spring elements, however, the enveloping cladding layer is solid connected to the cell-elastic material of the spring core, d. H. connected in parallel so that only a certain influence due to a hardness of the jacket layer that differs from that of the spring core the spring characteristic can be achieved. A damping effect that noticeably improves the suspension behavior on the other hand, good heat dissipation is not to be expected.

The invention is based on the object of the known cell-elastic ones, which are used as shock buffers To improve suspension body in terms of their suspension behavior. In particular, an increased Damping effect can be achieved with good heat dissipation at the same time.

Accordingly, the invention consists in the combination of the following features:

a) the shell consisting of airtight, elastic material encloses itself known way the spring body freely movable;

b) the spring body has a cavity which is closed off by a metal plate.

An advantageous embodiment results when the lower, inwardly directed edge of the envelope is attached between the metallic bearing plate and the bottom of the spring body.

The invention achieves in particular that, on the one hand, due to the open-cell structure of the spring body made of open-cell, elastic
Material. . , '; : ■ :. >; ·.

Applicant:

Lemförder Kunststoff G. mb H. & Co. KG,
Lemförde (Hann.)

Named as inventor:

Dipl.-Ing. Reinhold Szonn, Lemförde (Hann.)

Suspension body, the air in the cells contributes to achieving a high level of damping, on the other hand, however, the harmful heat generated by switching on with the greater damping work a material with good thermal conductivity in the form of a bearing plate can graze away.

The invention can be carried out in various ways. In the drawing, an embodiment of the invention is shown, namely shows

Fig. 1 a spring body in section,

A b b. 2 the spring body according to A b b. 1 under load.

The suspension body 1 consists of a plurality of annular buffer bodies 2 to 6 arranged one above the other, which are made of an open-cell, highly elastic polyurethane plastic and are connected to one another by surface adhesion. The elastic buffers 2 to 6 forming the spring body 1 are loosely and sealingly surrounded by a sleeve 8 made of elastic, but air-impermeable material. The shell 8 is fastened with its lower edge 8 α sealingly between the lower buffer body 6 and a bearing plate 9 made of metal that is firmly adhered to it. As a result of the ring-shaped buffer bodies 2 to 6, a cavity 10 closed at the top by the buffer body 2 and at the bottom by the bearing plate 9 is created in the middle of the spring body.

The air escaping from the open-cell material of the buffer body during the spring deflection can as a result of the envelope loosely surrounding the suspension body does not escape into the open, but is in an annular chamber 11 braked, which is automatically when deflected by the air pressure

· ;? Vi .. ·. -y \?,: - \ ':> K 709 548/173

forms. When the suspension body is loaded, air can likewise escape from the open cells of the elastic Material emerge into the cavity 10 closed by the bearing plate 9, however again not get into the open, so that at this point of the Federuhgskörpers an additional Damping effect 'is created by the. the suspension behavior overall,. will be further improved. By the metal bearing plate used to form the closed cavity 10 is also therefor ensured that the harmful heat that occurs can be quickly dissipated.

Claims (2)

Patent claims: ^{(| i} ' ^ii1: i;' ^i: F6derüÜgis! body made of open-cell elastic material, which is sealed with an air-impermeable cover, characterized by the combination of the following features: ■. a) the sheath (8) encloses the spring body (1) in a manner known per se so that it can move freely; ■ '_:; b) the spring body (1) has a cavity (10) through a metal plate (9) is complete. 2. Suspension body according to claim I _3, characterized in that the lower, inwardly directed edge (8 a) of the casing (8) between the metallic bearing plate (9) and the bottom of the suspension body (1) is attached. Considered publications:
German utility model No. 1 783 504,
1871029; ., "French patent specification, No. 11-14 439:
^ - U.S. Patent No. 2,701,583. 1 sheet of drawings 709 548/173 3. 67 © Bundesdruckerei Berlin