IGLIČNI LEŽAJ Ø 18x24x12

28,67 € 23,50 €
DOBAVLJIVO
SKU
669674B
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NEEDLE ROLLER BEARING


Malossi needle roller bearings are independent bearings that are ready for assembly and constructed from high-tensile steel with housings for the insertion and axial rotation of the rollers.
These devices are designed to allow reciprocal movement between two objects, constraining the rotation of the cage and housing the rotating elements with reduced overall dimensions, negligible weight and reduced friction. These are essential components in internal combustion engines which, by definition, have several rotating elements.
As can be seen in the image, a needle roller bearing assembly is made up of a body (cage) with housings into which the rollers are positioned that are held in place but free to rotate axially. It is, indeed, on the rollers that the external rotating surface rests and rotation between the two components takes place on these.

As the parts are subject to continuous acceleration and deceleration and, as a consequence, to notable inertial forces, it is essential that the cage combines considerable lightness with high strength and precision machining, and that the rollers are perfectly cylindrical and selected and coupled in size classes with extremely tight tolerances of the order of microns.
The cage itself must be constructed with extremely tight tolerances as it must keep the rollers separate and guide them correctly. It should be noted that the slots into which the rollers are housed must be perfectly parallel to each other to prevent undesirable movement of the rotating elements and consequent adverse axial thrust, which would cause elevated levels of overheating and drastically reduce the life of the component.
Malossi has selected only the best needle roller bearings on the market to guarantee optimal performance and unparalleled reliability. Only components equipped with needle roller bearings with extremely tight tolerances that are constructed from heat-treated steel have been selected, with exceptional mechanical strength and hardness.
Limited to a selection of applications, the roller bearings have an aluminium surface protection that guarantees greater resistance to wear and even reduced rotational friction. For applications requiring even greater resistance, copper surface protection has been used, a material which, in addition to reducing friction and protecting from wear, ensures better heat dispersion, allowing the cage to function correctly even when subject to elevated loads in high temperature atmospheres.

 

CODE Ø INTERNAL
mm
Ø EXTERNAL
mm
WIDHT
mm
ROLLER
BEARINGS
SURFACE
PROTECTION
6613484B 10 13 14.3 Massive steel Silver
66 3974B 10 13 14.5 Massive steel ---
6616783B 10 14 13 Massive steel Coppered
66 3973B 12 15 15 Molded in sheet metal ---
6612961B 12 15 16.6 Molded in sheet metal ---
66 4151B 12 15 17.5 Massive steel ---
66 8102B 12 16 16 Massive steel ---
6611785B 12 17 16 Massive steel ---
66 3276B 13 16 14 Molded in sheet metal ---
6615509B 13 17 17.7 Massive steel Coppered
6613807B 14 18 10 Massive steel Silver
66 7169B 15 18 14 Molded in sheet metal ---
66 3948B 15 19 20 Massive steel ---
66 8898B 16 20 20 Massive steel ---
66 6004B 16 20 23 Massive steel ---
66 5839B 16 21 10 Massive steel ---
66 7861B 16 22 12 Molded in sheet metal Silver
66 9674B 18 24 12 Molded in sheet metal Silver
 6618244 * 18 24 12.8 Massive steel Silver
66 3957B 20 26 12 Molded in sheet metal ---
66 8897B 20 26 15 Massive steel ---

* Equipped with shim
SKU Naziv
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