EP1182111B1 - Plunger buffer for elastically receiving buffing forces, especially for railway vehicles - Google Patents

Abstract

The buffer has spring-loaded (6) telescopic plunger buffer (1) and buffer casing (2), and an anti-turning lock of feather key (3) and groove (5). Buffer casing and feather key each have a bore, positioned at right angles to the longitudinal axis of the buffer. A bolt (4) located in the buffer casing bore (7) engages turnable into the bore (8) in the spring. The feather key is of steel or plastic.

Description

The invention relates to a sleeve buffer for the resilient absorption of impact forces, especially for rail vehicles, with two telescopically into each other guided, against the force of a spring clamped to each other housing parts - Buffer ram and buffer sleeve -, wherein for forming a rotation on one of the housing parts a feather key is fixed, with a Longitudinal groove of the other housing part cooperates.

A sleeve buffer with the aforementioned features is by the German Patent 43 37 257 known. To the two telescopically cooperating Housing parts Buffer ram and buffer sleeve rotationally fixed in the circumferential direction to connect with each other (anti-rotation), a feather key is provided, in the embodiment of FIG. 1 by welding with the buffer ram is connected and in a longitudinal groove on the outside of the buffer sleeve intervenes. In the embodiment of FIG. 2 acts in a groove of the Buffer sleeve held key with a formed inside the buffer plunger Longitudinal groove together.

Another sleeve buffer of this kind is from the DE-A-19 619 213.

The invention is based on the recognition that the dimensional games between the key and the longitudinal groove should be sized so that in operation the sleeve buffer occurring especially in eccentric load Frictional forces between the buffer ram and buffer sleeve in their telescope area also have play with each other; always over these two housing parts itself and not on the operative connection key - added longitudinal groove become. A small game between parallel key and longitudinal groove increases the friction of the sleeve buffer and leads to considerable wear. However, big game between keyway and longitudinal groove can be premature Failure of the sleeve buffer due to a worn out anti-twist device mean.

The invention is based on the object, a sleeve buffer of the generic Kind on constructive as simple as possible and cost-effective To make way so that the game between key and longitudinal groove can be made very small and yet the friction forces occurring only between the housing parts - Buffer ram and buffer sleeve - be recorded.

This object is achieved in that the one housing part and the key each one transverse to the longitudinal axis of the sleeve buffer having arranged bore, wherein in the bore of a housing part a bolt is held, which rotatably engages in the bore of the feather key. Because the keyway by its rotation even at relative Can always align inclination of the two housing parts, the Play between the parallel key and the longitudinal groove advantageously made very small be, with the ease of movement of the two housing parts to each other is guaranteed. Further low is the usual in known sleeve buffers Groove for fixing the feather key in the sleeve buffer according to the invention replaced by a simple hole for the feather key holding bolts.

Advantageous embodiments of the invention are specified in the subclaims.

Fig. 1

einen Hülsenpuffer im Längsschnitt, und zwar nach der Linie B - B in Fig. 2,

Fig. 2

den Schnitt nach der Linie A - A in Fig. 1,

Fig. 3

die Einzelheit Z aus Fig. 1 im vergrößerten Maßstab,

Fig. 4

eine weitere Ausführungsmöglichkeit des Hülsenpuffers im Längsschnitt.

Furthermore, the invention will be described in more detail with reference to exemplary embodiments, which are shown in principle in the drawing. Show it

Fig. 1

a sleeve buffer in longitudinal section, along the line B - B in Fig. 2,

Fig. 2

the section along the line A - A in Fig. 1,

Fig. 3

the detail Z of FIG. 1 on an enlarged scale,

Fig. 4

another embodiment of the sleeve buffer in longitudinal section.

According to Fig. 1 and 4, the housing of the sleeve buffer shown in each case from an outer housing part - the buffer ram 1 with buffer plate 1a - and an inner housing part, here buffer sleeve 2 with mounting plate 2a. Within this housing a symbolically drawn spring 3 is arranged, which is usually biased.

To obtain the biasing force of the spring 3 and the return stroke of the sleeve buffer To limit, embraces a transversely slotted, spring-trained Ring 9 (see Fig. 3) a circumferential collar 1b of the buffer ram 1, wherein this Ring 9 abuts against a cylindrical shoulder 2b of the buffer sleeve 2. By corresponding expansion of the resilient ring 9 with a suitable Tools are a simple assembly as well as a nondestructive disassembly the sleeve buffer in a short time possible.

To secure the sleeve buffer against rotation in the circumferential direction, In the exemplary embodiment according to FIGS. 1 and 2, the buffer sleeve 2 has a bore 7, in which a bolt 4 held firmly, for example by pressing is. This bolt 4 rotatably engages in a bore 8 of a feather key 3, the with a longitudinal groove 5 of the buffer ram 1 cooperates. The feather key 3 is preferably made of a suitable plastic (eg a polyamide); but it can also be made of a suitable metallic material (such as z. As steel) exist.

In the embodiment of FIG. 4, the bolt 4, the part of a Screw can be fixed in a bore of the buffer ram 1. Also in this Case engages the bolt 4 rotatably in the bore 8 of the feather key 3, the 4 rests in a longitudinal groove 5 of the buffer sleeve 2. In addition, will on the support of the feather key 3 against the cylindrical shoulder 2b Buffer sleeve 2 limits the return stroke of the sleeve buffer.

Two or more of each of the feather key 3 and the bolt 4 comprehensive Anti-rotation devices can each be distributed on the circumference of the sleeve buffer be arranged, as shown in Fig. 4 for a double arrangement is.

List of reference numbers

1

Buffer ram as outer housing part

1a

buffer heads

1b

circumferential collar

2

Buffer sleeve as inner housing part

2a

mounting plate

2 B

cylindrical shoulder

3

adjusting spring

4

bolt

5

longitudinal groove

6

feather

7

Bore in the buffer sleeve

8th

Bore in the feather key

9

slotted, springy ring

Claims (6)

1. Plunger buffer, especially for railway vehicles, for elastically absorbing impact forces, comprising two parts of a casing ― buffer tappet (1) and buffer casing (2) -, which are inserted into one another in the manner of a telescope and, by means of the tension of a spring (6), are under equalizing tension to one another, whereby in order to form an anti-twist device, on one part (2) of said casing a feather key (3) is fastened, which interacts with a longitudinal slot (5) of the other part (1) of said casing, characterized in that said one part (2) of said casing and said feather key (3) each comprise a borehole (7 respectively 8) arranged vertically to the longitudinal axis of said plunger buffer, whereby in said borehole (7) of said one part (2) of said casing a pin (4) is held which, being able to be rotated, grips into said borehole (8) of said feather key (3).
2. Plunger buffer according to claim 1, characterized in that said feather key (3) is made of a suitable metallic material.
3. Plunger buffer according to claim 1, characterized in that said feather key (3) is made of a suitable plastic.
4. Plunger buffer according to any of the claims 1 to 3, characterized in that said pin (4) is undetachably inserted into said borehole (7) of said one member (2) of said casing.
5. Plunger buffer according to any of the claims 1 to 3, characterized in that said pin (4) is detachably inserted into said borehole (7) of said one member (2) of said casing.
6. Plunger buffer according to any of the claims 1 to 5, characterized in that two or more of said anti-twist devices each comprising said feather key (3) and said pin (4) are distributed over the circumference of said plunger buffer.

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