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Selection of spherical plain bearings:
Axis is based on two bearings in radial and axial support, at this time, the spherical plain bearing is called a fixed-side on one side of SKF bearings, which bear both radial and axial load, fixed relative axial displacements between shaft and housing. Call free on the other side, only take radial loads, axial can be relatively mobile, as a solution to scale axis due to the temperature change problems and install the bearing interval error.
For a fixed-side bearing, select scroll available in axial movement (such as cylindrical roller bearings) or to assemble the movement (such as radial ball bearings), FAG bearings. On the short axis, fixed and free sides had virtually no other cases, using only unidirectional fixed axial movement of the bearing (such as radial thrust ball bearings)
Of quality defects of bearing heat treatment:
1. quenching crack
NSK bearings stress in quenching process of the formation of crack quench cracks. Formed this crack of causes has: because quenching heating temperature through high or cooling too rush, hot stress and metal quality volume change Shi of organization stress is greater than steel of anti-break strength; task appearance of original disadvantages (as appearance micro-crack or classified marks) or steel external disadvantages (as clip slag, and major of non-metallic mixed debris, and white, and shrinkage remaining,) in quenching Shi formed stress concentrated; major of appearance off carbon and carbide partial analysis of; parts quenching Hou tempered lack or is not timely tempered; behind processes formed of cold rushed stress had large, and Forged folding knife sharp edges, oil ditch, deep turning and so on. All in all, forming quenching crack of the cause can be one or more of the above factors, stress is the formation of quenching crack of important causes. Quenching crack deep, slender, fracture, straight and cutting plane no oxidation. It is often straight vertical crack on the bearing ring or annular cracks; on the ball bearing steel profile s-shaped, t-shaped or ring-shaped. Organizational characteristics of quenching cracks are cracks on both sides without removal scene, information on significant differences and forging crack and crack.
2. overheating
Crude from the spherical plain bearing part inspection after quenching on microstructure of hot, but does determine its level of overheating the necessary inspection of microstructure. Gcr15 needle-shaped steel quenched martensite, hardening heat organization. Formation causes of quenching temperature through heating or insulation of heating time is too long to form the one-sided hot; also significant is the original Ribbon carbide, low carbon zone between two large forms part of Ma's scalp, forming part from overheating. Overheating increased residual austenite in the Organization, dimensional solid landing. Quenched overheated steel large crystals, incurs landing part of toughness, impact resistance landing, TIMKEN bearings life landing. Major quenching cracks can form even overheating.
3. appearance decarburization
INA bearings in thermal solution process, be it heating in oxidizing media appearance will attack the oxidation part of appearance carbon quality scores increased, forming appearance decarbonization. Exterior decarburized layer depth beyond the last scrap of machining allowance for the parts. Appearance decarburized layer depth determination in metallographic test method of metallographic and micro-hardness that is available in law. Spread curve surface microhardness measurements other than law prevails, may make the quorum criteria.
4. thermal deformation of solution
Ball joint parts in thermal solutions, heat stress and organizational stress, this stress can overlap each other or part cancellation, is a complex variable, because it can speed, cooling, heating and cooling heating temperature, speed change, changes in shape and size of the part, deformation is not so hot to solve. Familiar and control it, and change the law to enable KOYO bearings variants (such as the oval ring, size up, etc) placed in the control's size, conducive to consumption. Of course in a hot solution of course also make parts of mechanical collision attack variant, but this variant is to be increased by improving operation and prevent.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| NNU4968 NTN | 340 | 460 | 118 |
| NNU4964K NTN | 320 | 440 | 118 |