DE202004010631U1 - Shaft-hub connection has downward compatibility in that hubs built according to new design must be fittable on old or conventional shaft-hub systems, but new shaft should not accommodate conventional hubs - Google Patents

Abstract

The new shaft-hub connection has downward compatibility, in other words the hubs built according to the new shaft-hub connection design must be fittable on old or conventional shaft-hub systems with standard cylindrical shafts, but the shaft built according to the new shaft-hub connection design should not accommodate the conventional hubs with concentric cylindrical bores. The outer contour of the new shaft should not be concentric, and this may be achieved by the forming of three different heights of cams alternating between 60 degree concentric sections.

Description

in the The following are details about a new shaft / hub Connection, which is a simple making of spare parts or foreign parts with hub for to make this connection difficult.

Most of time a manufacturer develops special tools for his machines, and offers so that complete problem solutions at. He usually wants the costs incurred during the development later by trade with the special ones Cover tools. This does not succeed if the tools of foreign tool manufacturers are copied and traded.

aim So it must be the tools of every machine manufacturer so that they can not be easily imitated.

The development described below makes it difficult to simply copy one Tool tremendous, because the standard production of the special hub costs only a few cents more, whereas the production is smaller Quantities disproportionately expensive is.

The further description is divided according to the usual development procedure in a requirement list (specifications) and in the description the solution.

Request list to the Connection (specifications)

• 1. Abwärtskompatibilität: Die gemäß der neuen Welle / Nabe Verbindung erstellten Naben müssen auf alten / konventionellen Wellen einsetzbar sein. Diese sind in der Regel runde Aufnahmewellen mit geringsten Rundlauf- und Durchmessertoleranzen. Die neuen Wellen hingegen dürfen eine Aufnahme der alten Naben nicht zulassen. Auf diese Weise kann ein Maschinenhersteller sein Werkzeugspektrum mit der Einführung einer neuen Maschinengeneration auf einmal umstellen. Seine Altkunden können weiter bedient werden, ohne das die Ersatzteilvielfalt zunimmt.
• 2. Die Außenkontur der Welle darf nicht konzentrisch sein. Damit kein Teil mit einer einfachen, wenn auch nicht normierten Bohrung rundläuft, müssen die Außeneckpunkte der Sonderkontur exzentrisch auf der Welle sitzen. Ein Bauteil mit konzentrischer Bohrung ist zu einfach herzustellen bzw. zu kopieren.
• 3. Damit die Fertigung der Nabenkontur effizient vollzogen werden kann, muß sie wenigstens bereichsweise konzentrisch sein. Gehohnte oder geriebene Werkzeugbohrungen sind sehr effizient herstellbar. Jegliche tragende Sonderkontur ist teurer und schwerer herstellbar. Es ist also sinnvoll, den radial tragenden Anteil der Innenkontur kreisförmig zu gestalten.
• 4. Eine kraftschließende Komponente sollte das System ebenfalls enthalten: Damit bei einer ungewollten Verdrehung der Nabe zur Welle keine Verklemmung oder Verschweißung entstehen kann, sollte das System eine kraftschließende Komponente aufweisen.

When designing a new shaft-hub connection, a number of boundary conditions have to be taken into account, without which there is no economic viability

• 1. Backwards Compatibility: The hubs made according to the new shaft / hub connection must be able to be used on old / conventional shafts. These are usually round receiving shafts with the lowest concentricity and diameter tolerances. The new waves, however, may not allow a recording of old hubs. In this way, a machine manufacturer can change its range of tools with the introduction of a new generation of machines at once. His old customers can continue to be served without increasing the number of spare parts.
• 2. The outer contour of the shaft must not be concentric. So that no part runs around with a simple, albeit non-normalized bore, the outer corners of the special contour must sit eccentrically on the shaft. A concentric bore component is too easy to manufacture or copy.
• 3. So that the production of the hub contour can be carried out efficiently, it must be at least partially concentric. Honed or ground tool holes are very efficient to produce. Any supporting special contour is more expensive and difficult to produce. So it makes sense to make the radially supporting portion of the inner contour circular.
• 4. The system should also include a force-locking component: In order to prevent jamming or welding when the hub is rotated unintentionally, the system should have a force-locking component.

Geometric description

wave

up shaft with alternately elevated and concentric areas. Each of the areas occupies about 60 °.

The increased Areas (cams) are each with different height of the cam configured, resulting in an eccentrically mounted outer diameter results. Between the areas described above, transition radii lie.

to Shaft may include a flange, which carries a driving pin. This driver or Index pin secures the torque transmission by means of positive locking.

Of the Flange can be made separately and shrunk onto the shaft non-rotatably be, the shaft can also be turned with the flange from the solid become.

hub

Of the Diameter is divided into 6 areas of 60 degrees each. Three of the Areas, Opposite, form the concentric receiving part. They are e.g. hailed radii in H7 quality.

By It is ensured that the tools thus executed also on usual can be used round machine shafts.

The another three 60 ° areas, each between the bearing on the shaft, so concentric Are areas, are always cutouts:

One another concentric circle, around the maximum cam height of the shaft plus safety distance is greater, as the receiving diameter, determines the outer contour. Between the inner and outer circle can transition radii lie.

It is also possible every nock of the shaft in to separate the hub individually.

It can Elements for a fonnschlüssige power transmission added.

Everything is so tolerated that the Twist angle allowed by the tolerances, no jamming of the Tool on the shaft allows.

Note on the cost situation

The at joined Connection via The recesses in the hubs located in the cams can be subjected to a combustion or spatial process be created because they are the area on the cam in each case only generously omitted have to. A generous plus tolerance is for the function does not influence.

additional costs fall for this special bore only to a small extent: the recesses may e.g. Laser burning or spatial engineering very cheap become.

Attachments

drawings the construction.

Claims (12)

Shaft-hub connection with Kopiererschwernis, characterized in that backward compatibility is given. This means that the hubs made according to the new shaft / hub connection must be able to be used on the old conventional shaft / hub system (normal cylindrical shaft); conversely, this must not be the case. The gem. The new shaft-hub connection does not accept conventional hubs (concentric cylindrical bore). Shaft-hub connection with copier difficulty, thereby characterized in that the outer contour of the Wave is not centric to its center. That is, so too no foreign hub with a simple, if not standard concentric Bore on the shaft runs around, have to the utmost Points of special contour eccentric at different heights on the Shaft be formed. Number and intermediate angle of division are for the fulfillment the requirements as desired. Preferably, however, three are different high cams of 60 ° alternately with each 60 ° engaging form concentric areas on the shaft. Shaft-hub connection with copier difficulty, thereby characterized in that the shaft is alternately elevated and executed concentric areas is. In the minimum, the shaft should have an increase to ensure eccentricity should but have three. Shaft-hub connection with copier difficulty, thereby characterized in that the elevated Areas (cams) each configured with different height of the cam are, resulting in an eccentrically mounted outer diameter. The Geometry of the cams can be carried out in various ways. Shaft-hub connection with copier difficulty, thereby characterized in that the necessary external machining The hub parts can be performed efficiently concentric because the inner contour of the bore is concentric with the hub. Shaft-hub connection with copier difficulty, thereby characterized in that a force-closing, a torsional moment transmitting, Component may also be included, depending on the design of the Connection during transmission for a moment the explosive effect of the special geometry to jamming or break hub can. Furthermore, it can be prevented so that the hub Shrinks when cooled in the twisted state on the shaft. Shaft-hub connection with copier difficulty, thereby characterized in that a possible positive connection from a flange which belongs to the shaft and to which it is firmly connected, which carries a driving pin, or its counterpart, the hole. The hub is wearing then the counterpart of the mounted on the shaft flange driver element. Shaft-hub connection with copier difficulty, thereby characterized as a possible moment transmitted with a keyway connection which is also in the geometric elements of the shaft-hub connection can be integrated, od. In this can protrude. That too is Replacing a cam area on shaft and hub, against a keyway connection, conceivable. Shaft-hub connection with copier difficulty, thereby characterized in that the diameter be divided into 6 areas can each include 60 °. Shaft-hub connection with Kopiererschwernis, characterized in that three of the six areas, which are each opposite, form the concentric receiving part. You can be honored radii in H7 quality. This ensures that the tools thus executed can also be used on simple concentric hubs without cams. This has advantages in the storage of hubs: In the case of one of the simple A system with a concentric shaft and hub on the connection system in question here, no need to stockpile old hubs. Shaft-hub connection with copier difficulty, thereby that the three other areas of the hub, respectively lie between the areas on the shaft, each regular Recesses are. The recesses are supposed to accommodate the cams Offer. This can be done individually in each cam, or in always same shape for all cams happen. In the case of always the same recesses then fits the hub every 120 ° her main axis turned on the shaft. It also fits on envelope in all three ways. In the case of individual recess, the location of the hub on the Wave in two ways limited. Possible construction always the same recess: another concentric circle, which is twice the maximum cam height plus safety clearance is bigger, as the receiving diameter, determines the outer contour. Between the inner and outer circle can transition radii or angle 1 corners lie. Shaft-hub connection with copier difficulty, thereby characterized in that the interlocking elements are tolerated so that the twisting angle, the tolerance of the mech. follower (whether pin with hole or wedge with groove) with his game allows no clamping of the hub on the shaft allows.