DE1600458C

DE1600458C - Radial lip seal

Info

Publication number: DE1600458C
Authority: DE
Inventors: Wilhelm Dr.-Ing. 6149 Erbach; Seeh Reinhold 6940 Weinheim Schmitt
Original assignee: Carl Freudenberg KG
Current assignee: Carl Freudenberg KG
Publication date: 1972-08-31

Description

3 43 4

in beiden Drehrichtungen zu erreichen. Bei dieser kurvenförmigen Kanten 5 ausgebildet sein. Im allge-in both directions of rotation. Be formed in this curved edge 5. In general

Gestaltung einer Profilierung wird das Leckmedium, meinen wird man bei einem Dichtring ErhebungenDesign of a profile is the leakage medium, one would think elevations in a sealing ring

welches zwischen die Rippen gelangt, jedoch nicht einer Art, also z. B nur kreisförmige oder dreieckigewhich gets between the ribs, but not of one kind, e.g. B only circular or triangular

zwingend zurückgeführt, sondern es wird zum Teil vorsehen. In der Zeichnung sind verschieden be-compulsorily returned, but it will be provided in part. In the drawing there are different

zur anderen Dichtungsseite, also im Lecksinn geför- 5 grenzte Erhebungen an einer Dichtung dargestellt,to the other side of the seal, i.e. in the direction of leakage, 5-bordered elevations are shown on a seal,

dert. Außerdem fehlt eine durchlaufende Dichtkante, um die Vielseitigkeit der Formen zu veranschaulichen,changes. In addition, a continuous sealing edge is missing to illustrate the versatility of the shapes.

so daß bei ruhender Welle keine Dichtung ge- Es können auch noch in anderer Form begrenzteso that when the shaft is at rest there is no seal

geben ist. Erhebungen gewählt werden, wobei es stets daraufgive is. Surveys are chosen, it always being so

Bei einer weiteren bekannten Dichtung (britische ankommt, daß die Begrenzungskanten dieser ErPatentschrift 499 480) soll eine Verkleinerung der io hebungen zur Dichtkante hin konvergieren. Es hat Auflagefläche des Dichtrings auf der Welle und eine sich als zweckmäßig gezeigt, die Stärke der Erhebungeringere Reibung erreicht werden. Zu diesem Zweck gen in radialer Richtung im Bereich von etwa 0,01 sind Rippen vorgesehen, die Zickzackform oder bis 0,5 mm zu wählen, wobei zu bemerken ist, daß Wellenform haben und etwa in Umfangsrichtung ver- zu große Stärken zu Undichtigkeiten beim Stillstand laufen. Diese Rippen bilden Fett- und ölkammem 15 der Welle führen können.In another known seal (British arrives that the boundary edges of this ErPatentschrift 499 480) is to converge a reduction of the io lifts towards the sealing edge. It has Support surface of the sealing ring on the shaft and one shown to be useful, the strength of the elevation rings Friction can be achieved. For this purpose gene in the radial direction in the range of about 0.01 ribs are provided, to choose the zigzag shape or up to 0.5 mm, whereby it should be noted that Have a wave shape and, for example, in the circumferential direction, excessively great strengths lead to leaks at standstill to run. These ribs form fat and oil chambers 15 can lead to the shaft.

sowie Kanäle, die mit der Mediumseite in Verbindung Durch Abstechen des Dichtrings entsteht die stehen und zur Schmierung der Rippen dienen. Eine Dichtkante, die im Bereich der Erhebungen 2 bis 5 Pumpwirkung ist mit dieser Gestaltung nicht zu er- mit 16 bezeichnet ist und im nicht eingebauten Zureichen, stand einen kleineren Radius hat als ihre mit 6 be-as well as channels that are connected to the medium side stand and serve to lubricate the ribs. A sealing edge in the area of the elevations 2 to 5 Pumping effect is not to be marked with this design with 16 and in not built-in enough, stand has a smaller radius than your 6

Für die Rückpumpwirkung ist entscheidend der 20 zeichneten Abschnitte zwischen den Erhebungen,The 20 sections drawn between the elevations are decisive for the pumping back effect,

im Bereich der Erhebungen im nicht eingebauten Wenn der in F i g. 2 im nicht eingebauten Zustandin the area of the elevations in the non-installed If the in F i g. 2 when not installed

Zustand geringere Durchmesser der Dichtkante dargestellte fertige Ring eingebaut wird, ergibt sichState smaller diameter of the sealing edge shown finished ring is installed, results

gegenüber dem übrigen Dichtkantenbereich, wodurch das in Fig. 3 veranschaulichte Laufbild, das z.B.with respect to the rest of the sealing edge area, whereby the moving image illustrated in Fig. 3, which e.g.

die hervorragende rückfördernde Wirkung erreicht unter Benutzung eines durchsichtigen Hohlzapfensthe excellent return effect is achieved using a transparent hollow pin

wird. 25 sichtbar gemacht werden kann. Die Dichtkante istwill. 25 can be made visible. The sealing edge is

In der Zeichnung sind Ausführungsbeispiele der in F i g. 3 in allen Abschnitten mit 6 bezeichnet, weilIn the drawing, exemplary embodiments of the FIG. 3 denoted by 6 in all sections because

Erfindung dargestellt. Es zeigt schematisch in Ab- die in F i g. 2 mit 16 bezeichneten Abschnitte beimInvention shown. It shows schematically in FIG. 2 with 16 designated sections in

wicklung und im Schnitt dargestellten Ausführungsbeispiel praktisch denselbenwinding and the embodiment shown in section practically the same

F i g. 1 einen Radiallippendichtring gemäß der Er- Radius haben bzw. in derselben Radialebene liegenF i g. 1 have a radial lip seal according to the Er radius or lie in the same radial plane

findung nach dem Ausformen aus der Preßform, 30 wie die Abschnitte der Dichtkante zwischen denFinding after removal from the mold, 30 as the sections of the sealing edge between the

F i g. 2 den in F i g. 1 dargestellten Dichtring nach Erhebungen 3 bis 5. Die schmale ringförmige Anlage-F i g. 2 the in F i g. 1 shown sealing ring after elevations 3 to 5. The narrow ring-shaped contact

dem Abstechen der Dichtkante und fläche des Dichtlippenteils 8 des Dichtrings imcutting off the sealing edge and surface of the sealing lip part 8 of the sealing ring in

F i g. 3 das Laufbild des Radialdichtrings gemäß Bereich der Dichtkante 6 ist mit 7 bezeichnet, an dieF i g. 3 the running pattern of the radial sealing ring according to the area of the sealing edge 6 is denoted by 7, to which

der Erfindung. sich die Flächenstücke 12,13,14 und 15 anschließen.the invention. the patches 12, 13, 14 and 15 are connected.

Der in F i g. 1 dargestellte Radiallippendichtring 35 Diese Flächenstücke sind diejenigen Teile derThe in F i g. 1 shown radial lip sealing ring 35 These surface pieces are those parts of the

hat auf der Fläche, welche sich an die noch nicht Flächen der Erhebungen 2 bis 5, die gegen die Wellehas on the surface, which is on the not yet surfaces of the elevations 2 to 5, which against the shaft

abgestochene Kante 1 anschließt, Erhebungen 2 bis 5. im eingebauten Zustand anliegen.cut off edge 1 is connected, elevations 2 to 5 are in contact when installed.

Die Erhebungen können kreisförmig (2), dreieckig 9 ist die Ringwendelfeder. Die Dichtung ist abge-The elevations can be circular (2), triangular 9 is the helical spring. The seal is removed

(3), halbkreisförmig (4) oder dreieckähnlich mit brachen dargestellt, d.h., der Halteteil ist fortgelassen.(3), semicircular (4) or triangular-like shown with halves, i.e. the retaining part is omitted.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims

1 2 oil that has passed through to the inside, and the swirl grooves Patent claims: on the inside, oil is pumped to the outside. In the opposite direction of rotation, the

1. Radial lip sealing ring, in which a sealing outwardly lying grooves an outwardly edged conveying effect by two directed at an angle 5, whereby a leak-intersecting surfaces is formed, whereby the surface facing away from the inner space to be sealed is formed up to in grooves in the desired direction, that is, the sealing edge has ongoing elevations inward, promote. The two differently directed swirls whose boundary edges for the purpose of the setbacks always act in opposite directions, conveying an angle with the generating line, their effectiveness depending on the angles they also form, characterized in that they form the shaft axis. Accordingly, the elevations (2, 3, 4, 5) are designed as a closed area to be achieved by structural measures, the limited effect of which is extremely difficult,
converging edges on the sealing edge, Triangles have already been ground in for the return of the leak, whereby the face of the sealing lip part (8) that pulls the medium to be sealed into the shaft in both directions of rotation is ground in triangles (magazine ».Mechanical geometrically with the surface of the elevations Engineering «from January 1966, p. 62), which lie radially in the area (2, 3, 4, 5) to one in the area of the elevations of the contact lines of the sealing edge of the sealing ring opposite the remaining sealing edge (6). As a result, however, the sealing edge (16), which is offset on the inside, cuts at high speeds. 20 of the wave causes vibrations of the lip,

2. Radial lip sealing ring according to claim 1, as soon as this namely through the ground characterized in that the elevations as triangles do not cause changes in diameter Triangles (3) with a truncated tip are more able to follow. But as soon as the sealing lip forms are. . these rapid changes in the course of the

3. Radial lip sealing ring according to claim 1, that adapts to the shaft surface, there is an increased penetration characterized that the bumps as wear and tear and a faster aging of the material Circles (2) or circular segments (4) formed on the sealing edge. Even when the with the cutting line running as a chord. Wave arise difficulties because the sealing lip edge differs from a cylinder surface

30 softening course of the wave surface in the

cannot adjust ground triangles; she

is therefore not on at these points. There is also a seal through the cited magazine position became known, the twist webs and twist grooves

The invention relates to a radial lip sealing ring, 35 has; however, they are different from poetry

in which a sealing edge is provided by two under one according to the invention on the medium side.

Angle intersecting surfaces is formed, the If under the sealing edge of this seal oil after

the area facing away from the room to be sealed has reached the outside, this cannot be

has raised bumps running into the sealing edge, catch and be conveyed back, as in the case of

whose boundary edges are the case for the purpose of the return 40 subject of the invention.

tion form an angle with the generatrix. With a crankshaft seal (French

In the case of these seals, a return of patent specification 1 468 256) has the sealing ring in

Leakage medium only occur in one direction of rotation. with effective profiling in both running directions

The invention is based on the object of an approximately triangular surface pieces, which, however, are in front of

To create radial lip sealing ring, which has an improved 45 of the sealing edge on the medium side, while-

Return in each of the two directions of rotation rend in the sealing ring according to the invention, the increase

causes. on the side facing away from the medium.

A radial lip is used to solve this problem. The priorities in the known seal

sealing ring of the type mentioned designed in such a way, existing teeth and triangles are also effective,

that the elevations as closed surface pieces 50 when they have no contact with the shaft, while

are formed, the boundary edges on the rend this in the seal according to the invention

To converge sealing edge, which must be given to the. Through the teeth and triangles

Sealing medium facing end face of this known seal is when the shaft with

Part of the sealing lip runs geometrically with the surface at high speeds, the one rotating with the shaft

of the elevations to one in the area of the elevations 55 oil ring destroyed. This is to prevent

compared to the rest of the sealing edge.radial inwards that a dynamic pressure is exerted on the lip

offset sealing edge cuts. will. With this arrangement of the profiling can

The elevations can be triangles with outwardly cut out under the sealing edge Be formed at a point or as circles oil no longer recede to the medium side. or segments of a circle, the cutting line being pumped as a chord 60. Gets at very high speeds runs. in this known seal too little oil to the

A radial lip sealing ring is known (German sealing edge, which is exposed to destruction as a result.

Utility model 1 956 150), in which a profiled seal (British

tion on both the medium turned away and patent specification 888 198) consists of the profiling

there are 65 ribs on the side facing the medium, which form an acute angle with the shaft

is. If the shaft runs in one direction, pumps form, with groups of three to five ribs

the twist grooves on one side, e.g. B. alternate the medium with each other, the ribs in the right

Abtiekchrten side, about under the sealing edge angle to each other, to a return