Axial shaft seals
17Pages

Axial Shaft Seals Less space required, less friction , easy to install

Carl Hirschmann GmbH Precision as passion Highest precision is the distinctive trademark of our axial shaft seals. With great passion and deep special know how we develop and manufacture trend-setting products for your ambitious requirements – since decades and with increasing enthusiasm. Carl Hirschmann – the precision benchmark For more than 60 years Carl Hirschmann GmbH develops and manufactures trendsetting products amongst others for vehicle construction, motor sport, aerospace, railed vehicles, mechanical and medical engineering, naval architecture and wind power plants. Core...

Contents General information Introduction, characteristics Application examples Technical notes, diagrams Installations guide Axial Shaft Seals Type VI Axial Shaft Seals Type VA Axial Shaft Seals Type VI (special sizes) Axial Shaft Seals Type VA (special sizes) Axial Shaft Seals Type DI General Information This catalogue is based on the latest in development and production. Diverging information in older documents no longer applies. We reserve the right to make modifications in the interests of continuous development of our products. Reprints and extracts shall only be permitted with our...

Axial shaft seals Introduction Carl Hirschmann Axial Shaft Seals do not seal radially on the shaft, but are installed on the shaft or in a bearing seat and provide their sealing effect on any hardened and ground, axial mating surface. For this reason, there is no shaft wear. Hardened and ground shaft collars or ends, as well as counter-rotating washers or the unstamped faces of antifriction bearings, are especially well suited as the mating surface. The sealing lip is of tapered design in order to keep heatup, wear and friction to a minimum. Its sturdy configuration ensures proper contact....

Application examples Applications: • Motor and gear manufacturing • Agricultural machinery • Machine tools • Track construction machines • Construction machines • Medical technology Track construction machine Installation examples Fertilizer spreader Fitting polishing machine Clarification plants Worm drive Push-fit shafts

Axial shaft seals Technical notes Material Friction and dissipated output Materials are selected on the basis of their chemical and thermal stability relative to the medium to the sealed. The table of resistance on page 5 schedules the elastomers customarily employed by us. In most applications, Perbunan® seals are employed. Care should also be taken to determine whether the anti-corrosive properties of the metallic components are sufficient. In order to determine the required drive output, information is necessary regarding the coefficient of friction at start-up and the dissipated output...

Permissible speed for Perbunan Mean diameter of sealing lip Ø dm [mm] Coefficient of friction dissipated output Moment of friction MRO [J] Example VI 118 Mean diameter of sealing lip Ø dm [mm]

Axial shaft seals Table of resistances Material very good very good very good very good very good limited to very good very good Fuel oils very good Silicon oils and greases very good Animal and vegetable fats very good very good Brake fluids very good very good limited to very good limited to very good Aromatic hydrocarbons very good Aliphatic hydrocarbons very good very good Acids (inorganic) Composition Colour Distinguishing mark Temperature range in °C (at the sealing lip) Shore hardness °Sh Abrasion resistance to DIN 53516 Flame resistant Gas permeability Weather (light, ozone) Water...

Installations guide Sealing surface - mating surface The unstamped, hardened and factory-ground faces of antifriction bearings or appropriately machined shaft collars and ends as well as support washers, thrust needle bearing washers or washers stamped from spring sheet or other economical solutions are suitable as the sealing surface. Steel, brass, bronze, aluminium alloys and ceramic can be employed as the materials. Properties of the sealing surface The sealing surface must be perfectly smooth and hard and may not contain any spiral grooves or scratches. Surface hardness for steel,...

Axial shaft seals Type VI.. (Standard sizes) Internal seal for liquids, predominantly oil and grease Type VI.. Axial shaft seal with internal sealing lip, mainly for use with liquids. The seal usually employed in a stationery manner, i.e. with a rotating shaft. Care should be taken to ensure that the sealing lip does not run dry. Should this be unavoidable, please contact us. By increasing the spring force, it is possible to raise the medium pressure by up to 50%, however this can result in greater friction and heat-up, and consequently in faster wear. A=contact pressure Type Perm. speed...

Type VI.. (Standard sizes) Internal seal for liquids, predominantly oil and grease Type VI.. Axial shaft seal with internal sealing lip, mainly for use with liquids. The seal usually employed in a stationery manner, i.e. with a rotating shaft. Care should be taken to ensure that the sealing lip does not run dry. Should this be unavoidable, please contact us. By increasing the spring force, it is possible to raise the medium pressure by up to 50%, however this can result in greater friction and heat-up, and consequently in faster wear. A=contact pressure Perm. speed Perm. Match-up...

Axial shaft seals Type VA.. (Standard sizes) External seal for grease only Type VA.. Axial shaft seal with external sealing lip, for use with grease. At low peripheral speeds and very good – if possible, lapped – mating surfaces, it can also be used with liquids. This seal can be employed in either a stationery or rotating manner. For use with liquids, the maximum permissible speed must be reduced to 1/3 of the figure indicated in the table. By increasing the spring force, it is possible to raise the medium pressure by up to 50%, however this can result in greater friction and heat-up, and...