THE NEW PREMIUM Q21 BALL BEARINGS
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THE NEW PREMIUM Q21 BALL BEARINGS

Q21 BALL BEARINGS GUARANTEE MAXIMUM PERFORMANCES THANKS TO INNOVATIVE DESIGN AND DEVELOPMENT Q21IRAC® - DENTAL BALL BEARINGS WITH THREE RADII PROFILE Standard ball bearings that work in tilting conditions are confronted with extreme constraining forces which lead to an early bearing failure. Not with our GRW Q21 features! In our new deep groove ball bearing Q21irac®, the angle of contact to the inner and outer ring aligns automatically and perfectly with all tilting motions during operation. The ball bearing set moves similarly to a circular orbit. Through this innovative design, noises and...

the shaft, the speed is transferred to the device, represented in picture 1 by a cylindrical pin. At the other end of the dental hand piece, the connection for the air supply is located. This air supply powers the motor by traveling through an internal piping system towards the turbine. The air is then channeled out of the handpiece via an integrated parallel aligned pipe. HIGH-PRECISION MINIATURE BALL BEARINGS AT THE DENTAL HAND PIECES HEAD’S HEART In order to perform properly, a dental drill needs high-precision ball bearing solutions in miniature format. These bearings make an appearance...

the hand piece is cleaned, sterilized and re-lubricated in a specific treatment process. During this cleaning interval, after a while a deficiency in lubrication is standard. The expired air does not only escape through it’s intended exit – some also streams out across the ball bearings. This means, that the inserted lubrication is constantly transported outside of the housing. slightly inclined. This is the only way that constraining forces on the cage, based on the various speeds inside the bearing, can be minimized or even prevented. Our GRW Q21 innovations are able to solve exactly...

the vibrations on the outer ring of the deep groove ball bearing. A hydrodynamically mounted shaft drives the inner ring at 3,000 revolutions per minute. simulated for the standard radial deep groove ball bearing and the Q21irac® ball bearing design with three-radius profile with combined load and inclination of the outer ring. In addition, the effects on the behavior of the cage and the ball/raceway contact are analyzed. In ball bearings of the dental turbine, the cage is considered the weakest component. Therefore, there is a direct relationship between the dynamic vibrations and the life...

„restlessly“. The consequence of this is that the cage wear settles at a high level and the ball bearing is perceived as noise-intensive. The bearings are axially aligned at the end face of the outer rings with one-dimensional springs and a spring rate of 10 N/mm. The speed of rotation is transferred to the rotor shaft between the two bearings. Diagram 1 shows the time course for the activation of preload (spring force), rotation (rotational speed) and loading (force application). This takes place one after the other, taking into account a corresponding settling time. The diagram for the...

tented three-radii profile in the outer ring raceway provides the optimal solution. With the help of the GRW noise test and the FE simulation, we were able to demonstrate that our innovative solution can compensate for a tilted installation position much better than current standard products. When our special ball bearings are used in dental turbines, they enable patients to have a significantly quieter, more pleasant experience. Also for the dentist, dental handpieces with the innovative Q21irac® ball bearings are a real asset. The longer service life span of the turbine reduces...

Using the example of the window cage, we present the new design of the ball pocket. The pocket design is not a cylindrical bore as in conventional designs, but rather a funnel or cone shape in the circumferential direction. The radial pocket delimitation is oriented precisely to the center of the cage. The axial expansion of the ball pocket does not change compared to the standard. bearing. This in turn is directly proportional to the running friction. Increasing the friction within the ball bearing leads to a drop in the speed of the turbine after a certain time If the turbine falls below...

life span) in a direct comparison. With the GRW Q21speed® design (funnel retainer), harmful friction on the contact surface between the ball and ball pocket can be avoided completely. As a result, an average of 10,000 min-1 higher idle speed can be applied in comparison to the standard bearing. With our Q21speed® technology, the average service life span is 178,3 hours. With a standard ball bearing, however, it is only 128,7 hours. Looking at early failures is much more important for the performance of the storage. With Q21speed®, the force is applied tangentially at the ball / ball pocket...

ball bearings with a shoulder that is ground on one side need to be built-in. However, this increases the manufacturing efforts and thus also the costs. In addition, such angular contact ball bearings can only be axially loaded in one direction. This leads to increased assembly effort and problems with disassembly. Another disadvantage of shoulder ball bearings in dental handpieces is the risk of bearings disintegrating during handling due to the bearing design. OUR TECHNOLOGY PROVIDES AN ALTERNATIVE We have developed the ideal solution for you with which these restrictions belong to the...

In the application example, the speed characteristic value is approx. 1,670,000 mm/min. The failure criterion of the application is the drop in speed due to wear in the ball bearing. Thanks to the flexibility of the cage halves and the reduced wearing process in the ball bearing, the following advantages of our GRW Q21twin® can be seen in the service life span test: The snap cage in a standard deep groove ball bearing shows a solid service life span with few early failures. The window cage in an identical shoulder bearing has a 10% longer life span compared to the snap cage. There were also...