Clamping set
A clamping set is a non-positive shaft-hub connection in mechanical engineering. The machine element connects a hub z. B. a gear with a shaft , so that a torque can be transmitted between the shaft and the hub . Furthermore, the hub is secured against axial displacement on the shaft.
Structure and principle of operation
Clamping sets exist in various technical designs. They usually consist of 2 ring-spring-shaped rings that are pushed over one another over conical surfaces. The inner and outer surfaces of the clamping set are cylindrical and are inserted into the bore of the hub with play or threaded onto the shaft. The conical surfaces of the inner and outer rings can be pulled towards each other for tensioning by means of several screws in the axial direction.
The conical surface can also be interrupted in a sawtooth shape in two or more parts that are turned from one piece or manufactured as a multi-part clamping set.
With all conical types, the conical surfaces from the axial preload force of the screws create a radial force component that elastically shrinks the inner ring and expands the outer ring, thus creating a pressure in the hub or on the shaft. To make this easier, slotted inner and outer rings are used on some types. This pressure leads to so much friction on the hub and shaft that both are firmly connected and torques can be transmitted.
With some types of clamping sets, the taper angles are so flat that they are self-locking . These clamping sets do not open even if the clamping screws are loosened.
application
For the installation of clamping sets, only one cylindrical end on the shaft and one cylindrical bore on the hub are to be provided. These shapes are easy to manufacture in one operation. Profiles or grooves that are complicated to manufacture as with other shaft-hub connections are not necessary.
However, clamping sets require more installation space than form- fitting or material-locking connections . It is not only the dimensions of the clamping set itself that are decisive. The hub must also have a sufficient wall thickness so that it does not fail due to the radial compression of the clamping set. In the event that there is not enough space for the assembly tool (Allen key) on the shaft in addition to the clamping set, there are also models that can be mounted radially with a special key.
There are clamping sets for shaft diameters in a very large range. Standard designs are available for shaft diameters from 5 mm to 1000 mm.
When properly assembled, clamping sets produce good concentricity properties due to the uniform radial pressure, which enables them to be used in precise applications such as machine tools.
If the shaft-hub connection is properly designed with a clamping set, twisting of the shaft relative to the hub should not occur and should also be avoided because of the possible damage to the shaft and hub. However, with special constructive measures and a corresponding design, a clamping set can be used as overload protection for other machine parts.
Other forms
In the case of quick-release clamping elements, instead of the axially parallel clamping screws, screwing the inner and outer rings together can be used to clamp the tapered rings. In addition to clamping sets with conical ring spring clamping elements, there are also membrane-shaped clamping sets.
Taper bushes also work in a similar way to tapered clamping sets , but they only require a ring, but the hub surface must be conical.
Individual evidence
- ↑ SSE data sheet. (PDF; 224 kB) VMA connection, measurement and drive technology, October 28, 2011, accessed on October 9, 2012 .