DE3336514C1

DE3336514C1 - Spring, in particular for piston rings

Info

Publication number: DE3336514C1
Application number: DE19833336514
Authority: DE
Inventors: Siegfried 5093 Burscheid Schönleber
Original assignee: Goetze GmbH
Current assignee: Goetze GmbH
Priority date: 1983-10-07
Filing date: 1983-10-07
Publication date: 1984-08-16

Abstract

In the case of a compression spring for piston rings in particular, it is proposed to introduce a smooth connecting pin loosely into both abutting ends of the spring and to provide stops in the region of the respective end of the connecting pin on the spring side, in order to avoid shifting of the connecting pin in the circumferential direction. <IMAGE>

Description

Um dies zu umgehen, besteht die Möglichkeit, im Bereich beider Enden des Verbindungsstiftes mindestens eine Federwindung radial in Richtung auf den Verbindungsstift zu verformen. Dies kann durch Verquetschen, Stauchen oder dergleichen mechanische Verfahren durchgeführt werden. Da hier jedoch eine nicht erwünschte Längenänderung der Feder eintreten kann, wird eine andere bevorzugte Möglichkeit zur Bildung der erfindungsgemäßen Anschläge darin gesehen, daß jeweils mindestens eine Federwindung vom Durchmesser her kleiner gewickelt wird als der Durchmesser des Verbindungsstiftes. Somit wird das Wandern des Verbindungsstiftes in Umfangsrichtung mit Sicherheit ausgeschlossen. Mit heutigen NC-gesteuerten Federwikkelautomaten entstehen bei der Massenfertigung keine zusätzlichen Kosten durch Bildung der Anschläge. To get around this, there is the option of using the area at both ends of the connecting pin at least one spring turn radially in the direction of the connecting pin to deform. This can be done by squeezing, upsetting or similar mechanical processes be performed. Since here, however, an undesirable change in length of the spring can occur, is another preferred possibility for the formation of the invention Attacks seen in that each at least one spring turn of the diameter is wound here smaller than the diameter of the connecting pin. Thus becomes the wandering of the connecting pin in the circumferential direction is definitely excluded. With today's NC-controlled spring winding machines are produced in mass production no additional costs by forming the attacks.

Zwecks optischer Hervorhebung der Anschläge besteht die Möglichkeit, mehrere Windungen kleiner und zusätzlich auch ohne Abstand voneinander zu wickeln. In order to visually highlight the attacks, there is the possibility of to wind several turns smaller and also without any distance from each other.

Die Länge des Verbindungsstiftes sollte nominal dem Maß zwischen den Anschlägen - gemessen über den Federstoß - entsprechen, um die Montage sicherzustellen. Bevorzugt ist jedoch eine geringfügig kleinere Längenabmessung des Verbindungsstiftes, um die Bewegungsarbeit der Feder im Betriebszustand nicht zu beeinflussen. The length of the connecting pin should nominally be between correspond to the stops - measured across the spring joint - to ensure assembly. However, a slightly smaller length dimension of the connecting pin is preferred, so as not to influence the movement work of the spring in the operating state.

Eine weitere vorteilhafte Ausbildung des Erfindungsgedankens ist darin zu sehen, daß die Anschläge, ausgehend von beiden Stoßenden der Feder, in Umfangsrichtung gesehen, zwischen 90" und 1200 Drehwinkel angeordnet sind. Durch diese Maßnahme wird sichergestellt, daß der Verbindungsstift lang genug ist, um bei eventuellem Fallenlassen der Feder nicht aus einem Stoßende herauszuspringen. Another advantageous embodiment of the inventive concept is to see that the stops, starting from both butting ends of the spring, in Seen in the circumferential direction, between 90 "and 1200 angles of rotation are arranged this measure will ensure that the connecting pin is long enough to not to jump out of a joint end if the spring is dropped.

Die Stiftmontage und das Federschließen können ebenfalls automatisiert werden. The pin assembly and spring closing can also be automated will.

Die Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben. Es zeigen F i g. 1 und 2: Unterschiedliche Ausbildung von Anschlägen zur Arretierung eines Verbindungsstiftes innerhalb einer Schlauchfeder. The invention is illustrated in the drawing and will be described below described in more detail. It shows F i g. 1 and 2: Different training of attacks for locking a connecting pin inside a hose spring.

Die in den F i g. 1 und 2 abgebildete Druckfeder 1 ist schlauchförmig ausgebildet und in Kreisform gebogen. The in the F i g. 1 and 2 depicted compression spring 1 is tubular formed and bent in a circular shape.

Zwischen den Stoßenden 2, 3 erstreckt sich der Federstoß 4. In beide Stoßenden 2,3 ist ein dem Krümmungsradius der zu verbindenden Federbereiche 5,6 angepaßter Verbindungsstift 7 lose eingeführt. Der innere Windungsdurchmesser der Feder list hierbei geringfügig größer ausgebildet als der Durchmesser des Verbindungsstiftes 7, um so beim Einführen eine gewisse Leichtgängigkeit sicherzustellen. Um das Wandern des Verbindungsstiftes 7 in Umfangsrichtung zu vermeiden, sind beidseitig der Enden 8, 9 des Verbindungsstiftes 7 mit der Feder 1 zusammenwirkende Anschläge 10, 11 vorgesehen.The spring joint 4 extends between the joint ends 2, 3 into both Butt ends 2.3 is the radius of curvature of the spring areas 5.6 to be connected adapted connecting pin 7 inserted loosely. The inner coil diameter of the The spring list here is made slightly larger than the diameter of the connecting pin 7, so as to ensure a certain ease of movement during insertion. About hiking of the connecting pin 7 in the circumferential direction are to be avoided on both sides of the ends 8, 9 of the connecting pin 7, stops 10, 11 cooperating with the spring 1 intended.

Gemäß Fig. 1 bestehen die Anschläge 10, 11 aus mehreren, auf Block gewickelten Windungen 12, 13, deren Durchmesser kleiner ausgelegt ist als der Durchmesser des Verbindungsstiftes 7. According to Fig. 1, the stops 10, 11 consist of several, on block wound turns 12, 13, the diameter of which is designed to be smaller than the diameter of the connecting pin 7.

In F i g. 2 werden die Anschläge durch eine zwischen einzelnen Windungen 14, 15 und 16, 17 angebrachte, aushärtende und temperaturbeständige Kunststoffmasse 18, 19 gebildet. In Fig. 2 the stops are made by a between individual turns 14, 15 and 16, 17 attached, hardening and temperature-resistant plastic compound 18, 19 formed.

In beiden Fällen ist der Verbindungsstift 7 so lang ausgebildet, daß er sich etwa bis 1200 Drehwinkel der Feder 1 beidseitig der Stoßenden 2, 3 erstreckt, ohne jedoch die Anschläge 10, 11 unmittelbar zu berühren. In both cases, the connecting pin 7 is so long that that it extends to about 1200 angles of rotation of the spring 1 on both sides of the butt ends 2, 3, However, without touching the stops 10, 11 directly.

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Claims

Claims: 1. Hose-shaped compression spring, bent approximately in a circular shape, especially for radial clamping of piston rings, with one in both butt ends the spring-inserted connecting pin, which has approximately the same radius of curvature as comprises the spring areas to be connected to one another, the inner coil diameter the spring is larger than the diameter of the connecting pin, characterized in that, that on both sides in the circumferential direction outside of the connecting pin (7) with the Spring (1) cooperating stops (10, 11) are arranged.

2. Compression spring according to claim 1, characterized in that the stops (10, 11) are made of an elastomeric or plastic material (18, 19).

3. Compression spring according to claim 1, characterized in that at least a spring coil (12, 13) is wound smaller in diameter than the diameter of the connecting pin (7).

4. Compression spring according to claim 3, characterized in that several the diameter of the smaller spring coils (12, 13) arranged without a spacing from one another are.

5. Compression spring according to claims 1 to 4, characterized in that that the stops (10, 11), starting from both butt ends (2, 3) of the spring (1), seen in the circumferential direction, between 90 "and 1200 angles of rotation are arranged.

The invention relates to a tubular, curved approximately in a circular shape Compression spring, especially for radial tensioning of piston rings, with one in both Butting inserted connecting pin that has approximately the same radius of curvature as comprises the spring areas to be connected to one another, the inner coil diameter is larger than the diameter of the connecting pin.

The US-PS 39 55 823 a spring for oil control rings can be found. This can, among other things, be tubular around one in both butt ends Have inserted connecting pin. The connecting pin is between the butt ends thickened and partially protrudes into the two with thinner extensions Pushing into it. It should be noted here that, due to the relative short length of the thinned area of the connecting pin, difficulties both can occur during transport and storage as well as during assembly. Is the connecting pin inserted into the two butting ends of the unstable spring when not assembled and if it falls down, the pin jumps out on impact. Furthermore is to be seen as a disadvantage that due to the thickening between the two butt ends the spring characteristics in the installed state changed disadvantageously over the entire circumference which may lead to the spring digging into the piston ring can.

Furthermore, DE-PS 10 95 060 is a spring, especially for radial Tensioning of oil control rings can be seen. With the spring designed as a hose serves as a closure for the two butting ends of wire at the same time as Intermediate link. Here is a very essential part of the coil spring by soldering pre-tensioned with the wire. The wire should preferably be laid in such a way that also in the unstressed state, a part of the same protrudes beyond a spring end in order to in the other end of the spring can be inserted.

The underlying problems here are essentially the same as before described in advance. On the one hand, the spring has to be pretreated in a relatively cumbersome way on the other hand, the connecting pin only partially protrudes into the other joint end into it.

Furthermore, a piston ring can be found in US-PS 36 95 622, its spring ends, as already described above, by means of a connecting pin are connectable to each other. After being inserted into the spring ends, the ends of the connecting pin is squeezed so that it can no longer be removed from the spring can be.

DE-AS 24 29 390 shows an annular hose spring in which the fastening end has a reduced winding diameter and on the connecting pin the free end of the connecting pin is loosely in the other Spring end introduced, so that there is also a risk that the spring at improper handling opens.

Due to the frictional connection, there are also difficulties here the removal of the connecting pin from the clamped area.

The invention is based on the object of a compared to the prior using technology to create a simpler connection between the spring and the connecting pin, which can be achieved without major manufacturing and assembly costs.

According to the invention, this object is achieved in that on both sides in the circumferential direction outside the connecting pin cooperating with the spring Stops are arranged. This measure achieves in a simple manner that a smooth connecting pin roughly adapted to the radius of curvature of the spring can be inserted loosely into both butt ends of the spring. Due to the attacks on both sides of the ends of the connecting pin will migrate the connecting pin in the circumferential direction safely avoided. This not only for the assembly case, but especially for the Operating condition.

Usually, there is a relative movement between in the operating state Piston ring and spring (connecting pin) instead. Is the connecting pin not using connected to the spring, it often happens that one end of the connecting pin then slips out of a butt end and so the mode of action of the spring towards zero goes. Furthermore, an impairment of the spring as in US-PS 39 55 823 is avoided, since the spring exerts an even force on the piston ring over the entire circumference can exercise.

A simple way of providing stops in the area of the spring, can be seen in the fact that one or more spring coils with a curable elastic or plastic material are provided, which the associated winding diameter the spring partially reduced or closed. However, it could be disadvantageous for the Be that operating condition as a result of - depending on the application - relatively high temperatures the stops melt and thus the connecting pin migrates again in the circumferential direction with all the disadvantages indicated.