DE3405556C1

DE3405556C1 - Clamping device for a cylinder wheel

Info

Publication number: DE3405556C1
Application number: DE19843405556
Authority: DE
Inventors: Erwin 7611 Nordrach Junker
Original assignee: Individual
Current assignee: Individual
Priority date: 1984-02-16
Filing date: 1984-02-16
Publication date: 1985-09-05
Also published as: BR8405367A; CA1263027A; CS244835B2; SU1409123A3; DD234250A5; CS759284A2

Abstract

A clamping device for a cylinder wheel having a triple-grooved cylinder-wheel bore. The clamping device exhibits a supporting pin with three splines which have rising contours in cross-sectional profile. When the cylinder wheel is pushed onto the supporting pin, the splines align with the grooves, such that a wide clearance allows easy pushing-on. When the cylinder wheel is turned with respect to the supporting pin, the rising spline contours are positioned against the groove edges and centre the cylinder wheel. Since the cylinder-wheel bore may have a large radial tolerance, the cylinder wheels can be inexpensively produced. <IMAGE>

Description

In der DE-AS 10 66 099 ist eine Schnellspanneinrichtung für ein rotierendes Schleifwerkzeug beschrieben, welches gegen einen Befestigungsflansch festgezogen werden kann. Zu diesem Zweck sind sowohl am Befestigungsflansch als auch an dem Schleifwerkzeug miteinander in Eingriff bringbare, schwalbenschwanzartig hinterschnittene und gekrümmte Spannflächen ausgebildet, welche jeweils spiralförmig verlaufen. Diese bekannte Anordnung ist indessen zum Fixieren und Spannen von Schleifringen zum Zwecke des Umfangsschleifens nicht geeignet, da eine radiale Zentrierung mit den erforderlichen Toleranzen aus fertigungstechnischen Gründen nicht erreicht werden kann. Zu diesem Zweck müssen nämlich die hinterarbeiteten Keilflächen von Flansch und Schleifkörper absolut deckungsgleich sein, d. h. Hinterschnitt, Teilung und Spiralform müssen an beiden Teilen exakt gleiche Werte haben, weil sonst beim Spannen des Schleifkörpers letzterer aus der Rotationsachse wandert. Es wird auch als nachteilig angesehen, daß die gesamte Umfangskräfte, welche vom Schleifvorgang herrühren, von den Zentrierkeilen übertragen werden müssen und sich somit, bedingt durch den geringen Steigungswinkel, der Zentrierflansch und der Schleifkörper verkeilen. Dadurch tritt auch an den Zentrierkeilen Verschleiß auf. In DE-AS 10 66 099 a quick release device for a rotating Grinding tool described, which against a mounting flange can be tightened. For this purpose, both on the mounting flange and can also be brought into engagement with one another on the grinding tool, in the manner of a dovetail undercut and curved clamping surfaces formed, which each spiral get lost. This known arrangement is, however, for fixing and tensioning slip rings not suitable for the purpose of peripheral grinding, as it has a radial centering the required tolerances cannot be achieved for manufacturing reasons can. For this purpose, the back-machined wedge surfaces of the flange and grinding wheel must be absolutely congruent, d. H. Undercut, pitch and Spiral shape must have exactly the same values on both parts, otherwise when clamping of the grinding wheel, the latter migrates from the axis of rotation. It is also considered to be detrimental considered that the total circumferential forces resulting from the grinding process of the centering wedges must be transferred and thus, due to the low Wedge the lead angle, the centering flange and the grinding wheel. This occurs wear on the centering wedges as well.

Nach einem weiteren Merkmal der Erfindung wird vorgeschlagen, daß bei jedem Keil die Kontur entgegen der Drehrichtung des Tragzapfens ansteigt. Wie bei den bekannten Schleifringspannvorrichtungen wird auch bei der erfindungsgemäßen Spannvorrichtung das Drehmoment reibschlüssig vom Tragflansch auf den fest dagegen gespannten Schleifring übertragen. Deshalb sind diejenigen Stellen, an denen die Keile noch vom Zentrieren her an den Nuträndern anliegen, von der Drehkraftübertragung entlastet, und der Schleifring könnte insoweit in beiden Drehrichtungen laufen. In dem normalerweise nicht auftretenden Fall jedoch, daß sich aus irgendwelchen Gründen die Anpressung des Schleifrings an den Tragflansch lockert, würde eine Ablösung der Keile von den Nuträndern die Zentrierung aufheben, so daß die sofort auftretende große Unwucht zu schweren Schäden oder gar Unfällen führen müßte. According to a further feature of the invention it is proposed that with each wedge the contour rises against the direction of rotation of the trunnion. As in the known slip ring clamping devices is also in the invention Jig the torque frictionally from the support flange to the fixed against it transferred to the tensioned slip ring. That is why the places where the Wedges are still in contact with the groove edges from centering, from the torque transmission relieved, and the slip ring could run in both directions of rotation. In the normally not occurring case, however, that results from any If the pressure of the slip ring on the support flange loosens, it would detach of the wedges from the groove edges cancel the centering so that the immediately occurring large imbalance would lead to serious damage or even accidents.

Die erfindungsgemäße Ausbildung der Spannvorrichtung verhindert dies, weil auch in einem solchen Notfall die Zentrierung aufrechterhalten und damit das Auftreten einer gefährlichen Unwucht vermieden würde.The inventive design of the clamping device prevents this, because centering is maintained even in such an emergency and with it that Occurrence of a dangerous imbalance would be avoided.

Nach einem weiteren Merkmal der Erfindung wird vorgeschlagen, daß drei Keile über den Umfang des Tragzapfens gleichmäßig verteilt sind. Es ist zwar bei Keilwellen bereits bekannt, eine ungerade Keilanzahl vorzusehen, und es sind auch Keilwellen mit drei Keilen bekannt. Stattdessen können aber auch vier oder fünf oder noch mehr Keile vorgesehen werden, ohne daß der Stand der Technik dies verbieten würde. Bei der Erfindung verhält es sich insofern anders, als es erfindungsgemäß gute technische Gründe gibt, genau drei Keile vorzusehen. So, wie Stühle mit drei Beinen niemals wakkeln, kann sich auch ein Tragzapfen mit drei gleichmäßig verteilten Keilen an drei und nur drei gleichmäßig verteilte Stellen des Schleifrings anlegen. Bei einem Tragzapfen mit z. B. fünf Keilen könnte es dagegen vorkommen, daß sich der eine oder andere Keil nicht an den Schleifring anlegt. Das könnte die zentrierte Ausrichtung des Schleifrings in Frage stellen. According to a further feature of the invention it is proposed that three wedges are evenly distributed over the circumference of the trunnion. It is true for splined shafts it is already known to provide an odd number of splines, and there are also known as splined shafts with three splines. Instead, you can also use four or five or more wedges can be provided without the prior art doing this would prohibit. The behavior of the invention is different from that of the invention there are good technical reasons to use exactly three wedges. Like chairs with three A lifting pin with three evenly spaced legs can never wobble Place wedges on three and only three evenly distributed points on the slip ring. When a trunnion with z. B. five wedges, however, it could happen that one or the other wedge does not touch the slip ring. That could be the centered one Question the alignment of the slip ring.

Ein Ausführungsbeispiel der Erfindung ist nachfolgend unter Bezugnahme auf die Zeichnungen näher beschieben. In der Zeichnung zeigt Fig: 1 eine erfindungsgemäße Spannvorrichtung mit eingespanntem Schleifring in Ansicht, Fig. Z einen Schnitt durch die Vorrichtung längs der Linie 1-1 in F i g. 1, in Zentrierposition und F i g. 3 einen Ausschnitt aus Fig.2, jedoch in Aufschiebeposition, in größerem Maßstab. An embodiment of the invention is referred to below describe in more detail on the drawings. In the drawing, FIG. 1 shows a device according to the invention Clamping device with clamped slip ring in view, FIG. Z a section by the device along line 1-1 in FIG. 1, in centering position and F i g. 3 shows a section from FIG. 2, but in the slide-on position, on a larger scale.

Die erfindungsgemäße Spannvorrichtung dient zum Spannen des Schleifrings 1, der aus Bornitrid mit geeigneter Bindung gebildet ist und erfahrungsgemäß sehr empfindlich gegenüber Unwucht ist. Die Spannvorrichtung besteht aus der Antriebswelle 2, dem Tragflansch 3, dem Tragzapfen 4, dem Lagerzapfen 5 und dem Spannflansch 6. The tensioning device according to the invention is used to tension the slip ring 1, which is made of boron nitride with a suitable bond and, according to experience, very is sensitive to imbalance. The clamping device consists of the drive shaft 2, the support flange 3, the support pin 4, the bearing pin 5 and the clamping flange 6.

Beim Einsetzen eines Schleifrings 1 wird dieser auf den Tragzapfen 4 aufgeschoben, bis der Schleifring i am Tragflansch 3 zur Anlage kommt. Dann wird der Spannflansch 6 auf den Lagerzapfen 5 geschoben, bis er am Schleifring 1 zur Anlage kommt. Schließlich wird der Schleifring 1 zentriert und der Spannflansch 6 mittels (nur aber strichpunktiert angedeuteter) Schrauben fest gegen den Tragzapfen 4 und den Tragflansch 3 gezogen. When inserting a slip ring 1 this is on the trunnion 4 pushed on until the slip ring i comes to rest on the support flange 3. Then it will be the clamping flange 6 pushed onto the bearing pin 5 until it is on the slip ring 1 to Plant is coming. Finally the slip ring 1 is centered and the clamping flange 6 by means of screws (only indicated by dash-dotted lines) firmly against the support pin 4 and the support flange 3 pulled.

Dadurch wird der Schleifring 1 festgespannt und bei Drehung der Antriebswelle 2 durch seinen Reibschluß zwischen den Flanschen 3 und 6 mitgenommen.As a result, the slip ring 1 is tightened and the drive shaft rotates 2 taken along by its frictional engagement between the flanges 3 and 6.

Der Schleifring 1 weist in der mittleren Schleifringbohrung 7 drei Nuten 8, 9 und 10 auf, die gleichmäßig verteilt, also um jeweils 1200 gegeneinander versetzt liegen. Der Tragzapfen 4 trägt drei Keile 11, 12 und 13, die ebenfalls gleichmäßig verteilt um jeweils 1200 gegeneinander versetzt liegen. Das Querschnittsprofil eines jeden Keils 11, 12 und 13, vgl. hierzu den Keil 11 in den F i g. 2 und 3, steigt von einem kleineren Radius R 1, der kleiner als der Bohrungsradius Bist, stetig auf einen größeren Radius R 2 an, der größer als der Bohrungsradius B ist. Dadurch wird die Kontur des Keiles 11 zu einer keilartig wirkenden schiefen Ebene, die bei Drehung des Schleifrings 1 im Uhrzeigersinn an den Nutrand der Nut 8 anläuft. So verhält es sich bei allen drei Keilen 11, 12 und 13. Eine Drehung des Schleifrings 1 im Uhrzeigersinn führt deshalb dazu, daß der Schleifring 1 sich an alle drei Keilkonturen anlegt und, von diesen gesteuert, in die in Fig.2 gezeigte zentrierte Position rutscht. In dieser Position wird der Schleifring durch Anziehen des Spannflanschs 6 fixiert. The slip ring 1 has three in the middle slip ring bore 7 Grooves 8, 9 and 10, which are evenly distributed, so by 1200 each against each other lie offset. The trunnion 4 carries three wedges 11, 12 and 13, which are also are evenly spaced offset from each other by 1200. The cross-sectional profile of each wedge 11, 12 and 13, cf. in this regard the wedge 11 in FIGS. 2 and 3, increases from a smaller radius R 1, which is smaller than the borehole radius, steadily to a larger radius R 2, which is larger than the bore radius B. As a result, the contour of the wedge 11 becomes a wedge-like acting inclined plane, which runs up to the groove edge of the groove 8 when the slip ring 1 is rotated clockwise. This is the case with all three wedges 11, 12 and 13. One rotation of the slip ring 1 clockwise therefore means that slip ring 1 adapts to all three wedge contours applies and, controlled by these, slides into the centered position shown in Figure 2. The slip ring is fixed in this position by tightening the clamping flange 6.

Die Erfindung ermöglicht also, wie F i g. 3 zeigt, ein leichtes Aufschieben mit weitem Spiel, während sie eine genaue Zentrierung ermöglicht, ohne daß der Tragzapfen 4 einen engen konzentrischen Sitz in der Schleifringbohrung 7 haben müßte. Vielmehr stellt sich der für das Zentrieren erforderliche enge »Sitz« zwischen den ansteigenden Konturen der Keile 11, 12 und 13 sowie den Rändern, z. B. 14, der Nuten 8, 9 und 10 ein. So ermöglicht die Erfindung die Verwendung von Schleifringen 1 mit relativ großen Radialtoleranzen in den Schleifringbohrungen 7. Solche Schleifringe sind wegen der erlaubten großen Toleranzen in der Herstellung billiger als bisher übliche Schleifringe. The invention thus enables, as shown in FIG. 3 shows a slight pushing-on with a lot of play, while allowing precise centering without the trunnion 4 should have a tight, concentric seat in the slip ring bore 7. Much more the narrow »seat« required for centering arises between the ascending ones Contours of the wedges 11, 12 and 13 and the edges, e.g. B. 14, the grooves 8, 9 and 10 a. So the invention enables the use of slip rings 1 with relative large radial tolerances in the slip ring bores 7. Such slip rings are cheaper than usual because of the large tolerances allowed in production Slip rings.

Die Drehrichtung der Spannvorrichtung mit dem Tragzapfen 4 ist in F i g. 3 mit dem Pfeil 15 bezeichnet. The direction of rotation of the clamping device with the trunnion 4 is in F i g. 3 denoted by the arrow 15.

Es ist zweckmäßig, daß die Kontur der Keile entgegen der Drehrichtung 15 ansteigt, daß also z. B. beim Keil 11 der kleinere Radius R 1 voranläuft.It is useful that the contour of the wedges counter to the direction of rotation 15 increases, so that z. B. in the case of the wedge 11, the smaller radius R 1 runs ahead.

Das Ansteigen der Keilkontur vom kleineren Radius R 1 auf den größeren Radius R 2 kann auf verschiedene Weise realisiert werden. Im Prinzip ist sogar ein lineares Ansteigen möglich. Eine fertigungstechnisch besonders einfache Lösung zeigt F i g. 3. Danach ist die Kontur des Keils 11 kreisbogenförmig, wobei jedoch der Krümmungsmittelpunkt M2 des Kreisbogens mit dem Radius R um die#xzentrizität xvom Mittelpunkt M1 des Tragzapfens 4 seitlich versetzt ist. The rise of the wedge contour from the smaller radius R 1 to the larger one Radius R 2 can be realized in different ways. In principle there is even a linear increase possible. A solution that is particularly simple in terms of production technology is shown F i g. 3. Thereafter, the contour of the wedge 11 is arcuate, but the Center of curvature M2 of the circular arc with the radius R around the xcentricity xvom Center M1 of the support pin 4 is laterally offset.

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Claims

Claims: 1. Clamping device for a slip ring, the one has clamping flange releasably attached to the support flange, the support pin of the Support flange several extending over its length and thereby projecting radially Has wedges which are associated with corresponding grooves in the bore of the slip ring are, characterized in that the cross-sectional profile of each wedge (11, 12, 13) of a smaller radius (R 1), which is smaller than the bore radius (B) of the slip ring (1), increases steadily to a larger radius (R 2) which is larger than the bore radius {B) is, and that each wedge (11, 12, 13) has the contour of an arc with the radius (R) has its center of curvature (M2) about an eccentricity (x) from the center (M1) of the trunnion (4) is laterally offset.

2. Clamping device according to claim 1, characterized in that for each wedge (11, 12, 13) the contour opposite to the direction of rotation (15) of the support pin (4) increases.

3. Clamping device according to one of claims 1 to 2, characterized in that that three wedges (11, 12, 13) are evenly distributed over the circumference of the support pin (4) are.

The invention relates to the clamping device for a slip ring, which has a clamping flange which is releasably fastened to the support flange, the support pin of the supporting flange several extending over its length and thereby projecting radially Has wedges which are associated with corresponding grooves in the bore of the slip ring are. The invention relates to an improvement of the clamping device, which not only facilitates the clamping of the slip ring, but also the manufacturing costs for the slip rings lowers.

Slip rings usually have circular bores, and accordingly The trunnions of the clamping flanges also usually have a circular cross-section. Because the very high speeds at which slip rings rotate generate eccentricities Dangerously high inertia forces in the slip ring bearing. That’s why it’s when clamping of a slip ring carefully to avoid imbalance, i.e. to exact centering to pay attention to. In the known slip rings, therefore, the play between the slip ring bore and the trunnion kept extremely low. Although this avoids an imbalance, but this at the cost of the disadvantage that sliding the slip ring onto the Trunnion becomes very difficult. Because of the very close game, the Slip ring lightly when pushed on, and it then requires a lot of tact every time, to loosen the tilt without damaging the slip ring and to slide it on to try the trunnion again. Quite a few work accidents while grinding are likely can be attributed to practically invisible defects on the slip ring that this only suffered when it was clamped in the jig.

The well-known slip rings that are in the slip ring bore are provided with grooves, and the corresponding trunnions, which are listed in Art a splined shaft are provided with splines, have the same disadvantages. That for the centering required close play also prohibits the easy placement here desirable wide game, which is why the difficulty in putting down in purchase are to be taken.

A way out of what has arisen from incompatible demands The slip rings proposed in the meantime show a problem, but they also do for completely different reasons, while grooved in the slip ring bore the trunnions are provided with wedges. Here is the radius surrounding the wedges only slightly smaller than the bore radius of the slip ring. Only when pushing it open the wedges work together with the grooves, with the wide play between the wedges and enables the grooves to be pushed on easily and without tilting. Then the slip ring is rotated slightly, causing the wedges to move away from the grooves and come to lie with close play opposite the hole, so that an exact Centering results. That way, it actually becomes a bit of a postponement wide play and precise centering with close play possible.

Like all known slip rings, the latter also have Slip rings still have the disadvantage of relatively high manufacturing costs, which are not ultimately result from the fact that it is very difficult and expensive to manufacture is to manufacture slip rings with the very precise radial tolerances required for the Centering are required.

The invention is based on the object of an even further improved To create clamping device that is not only easy to slide on and precise Centering allowed, but also the cheaper production of slip rings, namely those with further radial tolerances.

According to the invention, the object is in a clamping device of initially mentioned type solved in that the cross-sectional profile of each wedge of a smaller radius that is smaller than the bore radius of the slip ring, steadily increases to a larger radius, which is larger than the bore radius, and that each wedge has the contour of an arc of a circle with the radius, its center of curvature is laterally offset by an eccentricity from the center of the trunnion.

This means that the slip ring can be easily pushed on with the wide play that the wedges have in the grooves. However, the centering takes place no longer because the wedges are tight when turning the slip ring Fit the clearance concentrically into the slip ring bore, but rather by that they look like a wedge with their outer contours rising in the cross-sectional profile Create inclined planes on the edge of the groove of the slip ring, making it wedge-like from the controlled inclined planes, slides into the precisely centered position. Since this type of centering does not require a tight, concentric seat of the wedges in the slip ring bore, there is also no need to use slip rings with tight radial tolerances.

Slip rings with relatively wide radial tolerances can, however produce comparatively cheaply.

Another advantage is the gentle centering with growing Slip ring tolerances and the possibility of manufacturing the increasing cross-section Wedge profiles on the milling machines commonly used in production without complicated Special devices.