DE3418204C1

DE3418204C1 - Spring washer

Info

Publication number: DE3418204C1
Application number: DE19843418204
Authority: DE
Inventors: Egon 5982 Neuenrade Overhues
Original assignee: Vossloh Werke GmbH
Current assignee: Vossloh Werke GmbH
Priority date: 1984-05-16
Filing date: 1984-05-16
Publication date: 1985-08-22

Abstract

In the case of a corrugated and slotted spring washer composed of spring steel wire having an approximately rectangular cross-section, whose ends on the slot side and whose centre section diametrically opposite the slot, considered in the unloaded state, rest on a reference plane, while the domed section in each case located between the ends on the slot side and the centre section bulges out above the reference plane, the apex of the dome being arranged approximately 60 DEG to 90 DEG away from the slot, and the ends on the slot side in the radial direction being inclined such that they fall away to the outside of the ring, with respect to the reference plane, in order to develop said spring washer in such a manner that a loss of prestressing and hence loosening of the connection do not occur even when used in screw connections of a relatively high strength class, the centre section (3) is inclined towards the inside of the ring in the radial direction, with respect to the reference plane (E), and the dome apexes (S) of the domed sections (4) are inclined such that they fall away towards the outside of the ring. <IMAGE>

Description

Wie oben bereits erwähnt, wird durch das erfindungsgemäße Konzept der neuartigen Querneigung der Ringabschnitte die Torsionsfederkraft crhöht. Eine weitere Erhöhung der Torsionsfederkraft kann gemäi3 cincr vorteilhaften Weiterbildung der Erfindung noch didurch erreicht werden, daß das Verhältnis von Breite zu Stärke des rechteckigen Querschnittes des Federstahldrahtes größer als 0,6 gewählt und damit die Stärke des lederstahldrahtes gegenüber bekannten Federringkonstruklionen erhöht wird. As already mentioned above, the inventive concept the new type of transverse inclination of the ring sections increases the torsional spring force. One A further increase in the torsion spring force can be achieved in accordance with an advantageous further development of the invention was still achieved by that the ratio of width to strength of the rectangular cross-section of the spring steel wire selected to be greater than 0.6 and thus the strength of the leather steel wire compared to known spring ring constructions is increased.

lni l'olgenden ist zur weilercn Irläuterung und zum besseren Verständnis ein Ausführungsbeispiel der Erfindung unter Bezugnahme auf die Zeichnungen näher beschrieben. lni l'olgend is for the purpose of misunderstanding and better understanding an embodiment of the invention with reference to the drawings described.

F i g. 1 zeigt einen Querschnitt durch einen gewellten und geschlitzten Federring in der Ebene des Schlitzes. F i g. 1 shows a cross section through a corrugated and slotted one Spring washer in the plane of the slot.

F i g. 2 zeigt eine Draufsicht auf den Federring gemäß Fig. 1,und Fig.3 zeigt einen Schnitt in der Ebene 111-111 der Fig. 2. F i g. 2 shows a plan view of the spring ring according to FIGS. 1, and FIG. 3 shows a section in the plane 111-111 of FIG. 2.

Der in den Figuren dargestellte Federring besteht aus einem Federstahldraht mit einem etwa rechteckigem Querschnitt. Die Querschnittsabmessungen sind dabei derart gewählt, daß das Verhältnis von Breite b zu Stärke sgrößer als 0,6 ist. The spring ring shown in the figures consists of a spring steel wire with an approximately rectangular cross-section. The cross-sectional dimensions are included chosen such that the ratio of width b to thickness s is greater than 0.6.

Wic insbesondere aus F i g. 2 hervorgeht, ist der Federstahldraht derart ringförmig gebogen, daß er mit sei-Iicn Enden 1 einen Schlitz 2 bildet. Wic in particular from FIG. 2 is the spring steel wire bent annularly in such a way that it forms a slot 2 with its ends 1.

Auf der dem Schlitz 2 diametral gegenüberliegenden Seite besitzt der Federring einen Mittelabschnitt 3. Zwischen dem Mittelabschnitt 3 und den schlitzseitigen Enden 1 liegen Wölbungsabschnitte 4, deren Wölbungsscheitel S jeweils etwa 70" vom Schlitz entfernt angeordnet sind. Has on the side diametrically opposite the slot 2 the spring ring has a middle section 3. Between the middle section 3 and the slot-side Ends 1 are arching sections 4, the arching apex S each about 70 "from Slit are located away.

Im entlasteten Zustand betrachtet, liegen die schlitzseitigen Enden 1 und der dem Schlitz 2 diametral gegenüberliegende Mittelabschnitt 3 auf einer Bezugsebene E (vgl. Fig. 1) auf. When viewed in the relieved state, the ends of the slot are located 1 and the middle section 3 diametrically opposite the slot 2 on one Reference plane E (see. Fig. 1).

Die Wölbungsabschnitte 4 dagegen sind über die Bezugsebene E herausgewölbt, wobei die Wölbungsscheitel S - wie bereits beschrieben - etwa 70" vom Schlitz 2 entfernt angeordnet sind. Die schlitzseitigen Enden 1 sind in radialer Richtung hinsichtlich der Bezugsebene E zur Ringaußenseite hin abfallend geneigt, wie dies insbesondere aus F i g. 1 zu ersehen ist. The bulge sections 4, on the other hand, bulge out beyond the reference plane E, wherein the arch vertices S - as already described - about 70 "from the slot 2 are arranged remotely. The slot-side ends 1 are in the radial direction sloping with respect to the reference plane E towards the outside of the ring, like this in particular from FIG. 1 can be seen.

Gegenüber bekannten Federringkonstruktionen sind nun erfindungsgemäß hinsichtlich der Bezugsebene E der Mittelabschnitt 3 in radialer Richtung zur Ringinnenseite hin und die Wölbungsscheitel S der Wölbungsabschnitte 4 zur Ringaußenseite hin abfallend geneigt. Compared to known spring ring constructions are now according to the invention with regard to the reference plane E, the middle section 3 in the radial direction towards the inside of the ring towards and the bulge apex S of the bulge sections 4 sloping towards the outside of the ring inclined.

Diese Neigung beträgt im vorliegenden Ausführungsbeispiel 100, wie aus den Fig. 1 und 3 zu ersehen ist.In the present exemplary embodiment, this inclination is 100, such as from Figs. 1 and 3 can be seen.

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Claims

Claims: 1. Corrugated and slotted spring ring made of spring steel wire with an approximately rectangular cross-section, its slot-side ends and its the slot diametrically opposite central section viewed in the unloaded state rest on a reference plane, during each between the slot-side ends and the bulge section lying on the central section bulges out over the reference plane with the crown apex about 60 ° to 90 "from the slot and the slot-side ends in the radial direction with respect to the reference plane are sloping towards the outside of the ring, characterized in that with respect to the reference plane (Ej of the middle section (3) in the radial direction to The inside of the ring and the apex (S) of the bulge sections (4) towards the outside of the ring sloping downwards.

2. Spring ring according to claim 1, characterized in that the inclination 1 "to 15 °.

3. Spring ring according to claim 1, characterized in that the inclination 5 ° to 15 °.

4. spring ring according to claim 1, characterized in that the inclination 10 °.

5. spring ring according to claim 1, characterized in that the ratio from width (b) to thickness (S) of the rectangular cross-section of the spring steel wire is greater than 0.6.

The present invention relates to a corrugated and slotted one Spring ring made of spring steel wire with an approximately rectangular cross-section, its slot-side Ends and its middle section diametrically opposite the slot in the relieved State viewed on a reference plane, during each between the slit-side ends and the central portion lying bulge portion over the reference plane is arched out with the arch apex about 60 ° to 90 "from Slot is arranged remotely and the slot-side ends in the radial direction are inclined sloping with respect to the reference plane towards the outside of the ring.

Spring washers of this type are known (see. DE-PS 12 55 398). According to DIN 977 they provide non-positive, co-tensioned resilient elements for screw connections represent a drop in preload caused by settling or creep processes compensate and thus counteract any loosening of the connection.

According to the prevailing opinion in the professional world, spring washers this type of securing effect only with screw connections with short Screws of the lower strength class (see technica magazine 14/1980, page 1222, 3rd paragraph). Before using such spring washers with tempered screws is even generally warned in the professional world (see Verbus, screw locking, page 2, right column and screw vademecum, K. H. Illinger, D. Piume, Section 3.4.1). In the new version of the relevant DlN regulations, it is also planned to point out that that such spring washers are ineffective from a certain strength class.

The object of the present invention is therefore to provide a spring washer of the type described in such a way that even when used in the case of screw connections of a higher strength class, there is a drop in preload and thus the connection is not loosened.

According to the invention, this object is achieved with a spring ring that with regard to the reference plane of the middle section in the radial direction towards the inside of the ring towards and the bulge apexes of the bulge sections sloping towards the outside of the ring are inclined.

The features according to the invention are the first time a spring washer created, which - as tests have confirmed - also for screw connections of strength classes equal to or greater than 8.8 can be used.

According to the invention, this is related to a special design the inclination of the individual sections of the ring in the radial direction, d. H. achieved by a completely new concept of the transverse inclination of the ring sections, due to the same dimensions compared to known conveyor ring constructions - an increased torsion spring force is achieved.

In principle, the individual ring sections are already known equip a spring ring of the type described with a transverse slope (See, for example, Figure 9 of DE-PS 12 55 398). This bank is however chosen so that the opposing sections in the same way (That means either sloping towards the outside of the ring or towards the outside of the ring increasing) are inclined and the inclinations merge into one another in such a way that when Always tighten the screw connection on the outside of the ring on the pressure surfaces first arrives at the plant.

According to the invention, however, for the first time with regard to the inclination The ends of the slot and the middle section are in the opposite direction or in opposite directions Transverse inclination is provided and this is combined with a transverse inclination of the arch apex, that of the transverse inclination of the arch apex of the known ring construction mentioned above is opposite. These measures reduce the spring deflection of the spring steel wire in the portion subjected to torsion between the crown and the Central section significantly increased without increasing the overall height. The material of the spring steel wire is in the relatively short section between the apex of the arch and the slot-side Ends not stressed by torsion.

Another advantage is that the slot-side ends due to the constant inclination up to the apex of the arch can be manufactured more precisely, which results in even less damage to the counter bearings.

Tests have shown that the inventive effect is already at an inclination of 1 "occurs. For the inclination, inclination angles between 1 and 15 ° can be selected.

However, particularly good results are achieved when the inclination 5 ° to 15 °. A particularly advantageous angle of inclination is 10 °.