DE1147255B - Hollow buffer springs subject to pressure, especially for rail vehicles - Google Patents

Description

GERMAN

PATENT OFFICE

Ρ23469Π / 20β

REGISTRATION DATE: SEPTEMBER 3, 1959

NOTICE RESERVATION AND ISSUE. THE
INTERPRETATION; J?,. APR 11 ₄ 1963

The invention relates to a hollow buffer spring subjected to pressure, in particular for rail vehicles, made of elastic! Material with an undulating wall profile in the longitudinal section.

They are hollow buffer springs that are subjected to compression Made of elastic material that is bushy-shaped designed and delimited in their wall shape in the longitudinal section in a wavy manner. In the elastic material is a metallic helical spring embedded, whose winding course d, er weMenfönr4gen Limitation of the wall in such a way that di, e wave troughs on the outside The corrugation troughs on the inside of the coil spring opposite sjnd located between the turns of the coil spring. Such buffer springs get when they are compressed their protection against buckling through the combined action of the helical spring and the elastic wall material. In many cases, the embedding of the metallic coil spring, because of the because of this, costs incurred and, because of the difficulty of creating an adhesive bond between the non-metallic elastic material and the metal of the coil spring are undesirable. In addition, this buffer spring when compressed undergoes an increase in diameter from its stretched state ;.

In another known hollow buffer spring made of non-metallic elastic material 'are for Distribution of the deformation work over the largest possible areas of the wall in transverse planes or several constrictions or protruding outwards Bulges present; Furthermore, the inner wall course of the buffer body forms ribs, which run helically. When the buffer body is compressed, it bulges Wall in the areas between the outer constrictions or bulges on not predeterminable points, with a corresponding increase in the outer diameter of the Bulges is connected.

Finally, there are buffer springs for rail vehicles known which are composed of a plurality of rubber rings and metal washers in such a way that each rubber ring is gripped between two metal washers and firmly bonded to them by vulcanization. In the cavity of this rubber-metal buffer spring, a flexible hose is arranged to a limited extent. This embodiment aims to influence the deformation of the buffer spring in such a way that buckling of the rubber wall and its destruction caused by it.
especially for rail vehicles

Applicant:

Paul Pleiger Maschinenfabrik ,.
Hamrnerthal-Noird via Hattingen / Ruhr

Fritz Leh ,. Schiffweiler (Saar),
has been named as the inventor

is avoided .. Fajyrzeug buffer springs of this type are because of their multi-part and. because of the volcanization connection; dfif rubber rings, with the metal washer each expensive; ok the production.

The object of the invention is to provide a Buffer spring dejj indicated at the beginning; type of creation, at which- the working hours · at; Press together the puj | feder: injvoabe.stnnmb.ajjer. Way on the wall; distributed and confused accumulation; Which the danger of kneeing out ;. and education; from Kink cracks result, is avoided. This task will; solved according to the invention. that < the wall in a longitudinal section through wall parts that are convex towards the outside and inside, and those in between radial ribs are formed in one piece. The deformation begins here on the Places of the densest flow of forces, i.e. where the convex wall areas meet the radial ribs adjoin, and propagates from there with increasing load to the middle of the convex wall areas. The deformation takes place in these Convex wall areas located between the ribs in the manner of a flattening with increasing Spring characteristic. Bulging does not occur, so that there is also the risk of local overstretching of the Buffer body material and the resulting kink cracks is avoided. With the invention Training it is possible by appropriate choice of the number and thickness of the convex wall parts to largely adapt the spring characteristic to the respective requirements.

According to a further feature of the invention is at a small distance from the outer edge of the ribs arranged a guide surface. The ribs are supported on this if, in the event of an external

309 550/78

usually strong buffer shock a tendency of the buffer spring to buckle should occur.

Finally, a further embodiment of the invention serves to reduce the risk of buckling the feature that the buffer spring at its ends with collar-shaped thickenings in recesses engages a buffer plate and a component attached to the vehicle.

The subject of the invention is shown in the drawing in two exemplary embodiments, namely shows

Fig. 1 shows a hollow buffer spring, the wall of which in a longitudinal section is rounded inwardly and outwardly and only forms outwardly protruding ribs,

Fig. 2 is a section along the line H-II in Fig. 1,

Fig. 3 a buffer spring similar to Figs. 1 and 2, but with ribs protruding inwards and outwards,

Fig. 4 shows a section along the line IV-IV of Fig. 3.

It denotes 1 a buffer plate which is moved in the direction of the part 2 of the vehicle body when it is hit. This movement is counteracted by the buffer spring 3, which is designed to be hollow and has a profile of its wall that is spherically limited towards the inside and outside. Between the spherically delimited wall areas there are ribs 4 which, tapering off with a rounded transition, protrude outwards (Figs. 1 and 2) or outwards and inwards (Figs. 3 and 4) with the same or removable thickness. Of these, the ribs 4 'are designed with a slightly smaller diameter than the other ribs. In the vicinity of the ribs 4 there extends a guide surface 5 which is fixedly arranged on the vehicle body.

At both ends, the buffer spring 3 engages with collar-shaped Thickenings 6 in recesses 7 of the buffer plate 1 and the part 2 fixed to the vehicle. There is also a mandrel 8 which engages the interior of the buffer spring 3 on one side.

The essence of the buffer spring 3 is that the spherical delimitation of its wall determines its deformation behavior. The buffer spring experiences when compressing no local buckling of their wall and is therefore less susceptible to the formation of kink cracks. Their deformation when compressed takes place as Flattening of the wall areas with a convex cross-section, the ribs 4 stiffening the Effect the buffer spring against bulging. In the event of a very strong impact on the buffer spring and this Any tendency that occurs to bulge or buckle provides support for the ribs 4 on the guide surface 5, which may also be designed as a tubular casing for the buffer spring 3 can be. In general, however, a lower guide surface 5 is sufficient because the weight of the Buffer spring acts in the direction of bulging downwards. So that the buffer plate 1 adjacent Rib 4 'does not hit the support of the guide surface 5 when the buffer spring is compressed, the rib 4 'is kept smaller than in diameter the remaining ribs.

Claims (4)

PATENT CLAIMS: 1. Pressurized hollow buffer spring, in particular for rail vehicles, made of elastic material with an undulating wall profile in longitudinal section, characterized in that the wall in longitudinal section is formed by wall parts that are outwardly and inneirljallig and intermediate radial ribs (4) in one piece is. 2. Buffer spring according to claim 1, characterized in that the ribs (4) have a rounded one Have transition to the convex wall parts and are tapered towards the outside. 3. buffer spring according to claims 1 and 2, characterized in that with a small distance a guide surface (5) is arranged from the outer edge of the ribs (4). 4. buffer spring according to claims 1 to 3, characterized in that the buffer spring on their ends with collar-shaped thickenings (6) in recesses (7) of a buffer plate (1) and engages a component attached to the vehicle (2). Considered publications:
German Auslegeschrift No. 1034 421,
1035413;
British Patent No. 755 186. 1 sheet of drawings © 309 550/78 4.63