High bearing temperature?

What bearings? Is there any friction between this disk and things like retainers?

Friction between the aluminum sheet and the bearing components must be causing heat generation; I’ve really never seen such a practice – it’s better to use sealed bearings instead.

It can be inferred that this disc causes the inner ring of the bearing to shift out of position; as a result, excessive stress is applied to one side of each of the inner and outer rings, leading to severe wear and high temperatures. Not all cylindrical roller bearings allow the inner and outer rings to be interchanged freely – bearings of the N and NU types have no ribs on their outer rings, while the inner rings have ribs on both sides. Displacement of the shaft in both axial directions relative to the bearing housing is allowed. The outer ring of NU-type bearings has flanges on both sides, while the inner ring does not have flanges. It is also possible to allow displacement of the shaft relative to the bearing housing in both axial directions. Therefore, this type of structure is suitable for use as a floating-end bearing. NJ, NF types: The outer ring of NJ-type bearings has flanges on both sides, while the inner ring has a flange on one side. It can withstand a certain amount of unidirectional axial load. The NF type has a rib on one side of the outer ring and ribs on both sides of the inner ring. It can also withstand a certain amount of unidirectional axial load. Therefore, this type of structure is suitable for use as a unidirectional axial positioning bearing. NUP, NFP types: Bearings of the NUP type have flanges on both sides of the outer ring, with a (fixed) single flange on one side of the inner ring and a separable flat flange on the other side. It can withstand a certain amount of bidirectional axial load. The outer ring of the NFP type bearing has a fixed single flange on one side, while the other side features a separable flat flange; the inner ring has flanges on both sides. It can also withstand a certain amount of bidirectional axial load. This type of structural bearing can limit the shaft’s displacement in both axial directions relative to the bearing housing. Therefore, it is suitable for use as a fixed-end bearing. The NH(NJ+HJ) type NH bearing is a structure formed by combining an NJ type bearing with an HJ type inclined retainer. Since the inner ring of NUP-type bearings is shorter, and the flat retaining ring is not fixed, they are inconvenient to use; whereas NH-type bearings can take advantage of the full width of the inner ring of NJ-type bearings, allowing for a tighter fit with the shaft. Moreover, NH-type bearings are easier to install and remove. NH-type bearings can restrict the shaft’s displacement in two axial directions relative to the bearing housing. Therefore, it is suitable for use as a fixed-end bearing. Folded double-row bearings, double-row cylindrical roller bearings – these bearings come in two designs: those with a cylindrical inner bore and those with a conical inner bore (the suffix K is added to the bearing’s designation in this case). These types of bearings feature a compact structure, high rigidity, large load-bearing capacity, and minimal deformation under load, making them particularly suitable for supporting machine tool spindles. The conical inner hole can also serve to make minor adjustments to the clearance, and it simplifies the structure of the positioning device, facilitating installation and removal. The commonly used double-row cylindrical roller bearings come in the following types: NN and NNU. The outer ring of the NN type bearing has no flange, while the inner ring has flanges on both sides along with a central flange. It is possible to allow axial displacement in two directions between the shaft and the bearing housing. The outer ring of the NNU type bearing has flanges on both sides and a central flange, while the inner ring has no flanges. It is possible to allow axial displacement in two directions between the shaft and the bearing housing. Therefore, such structures are suitable as floating-end bearings. The retainers for this type of bearing are mostly solid retainers manufactured by turning. NNF type: The NNF type bearing is a double-row full complement cylindrical roller bearing, consisting of an outer ring with a central rib and two inner rings with double ribs. The rollers are guided by the flanges on the inner rings, and the two inner rings are fixed together with fastening rings. In addition to being able to withstand large radial and axial loads, this structure can also resist overturning moments; therefore, it is commonly used as a fixed-end bearing. The NNF type bearings are equipped with contact seals on both sides. The bearing is filled with lubricating grease, whose operating temperature ranges from -50°C to +110°C. However, due to the limitations of the sealing materials, the operating temperature of the bearing is limited to between -40°C and +80°C. Under favorable operating conditions, NNF bearings with seals require no maintenance. However, if the bearings are exposed to moisture or a polluted environment and operate at medium to high speeds, they can be lubricated again through the oil grooves and oil holes on the outer ring. Four-row folded bearings, four-row cylindrical roller bearings – these types of bearings are primarily used in steel rolling machines such as cold and hot rolling mills, as well as bloom mills. They have a separate structure, allowing the bearing rings and the rolling element assemblies to be easily separated; this facilitates cleaning, inspection, as well as installation and disassembly of the bearings. FC type: The FC type bearing consists of two outer rings and one inner ring; each outer ring has flanges on both sides along with a central flange, while the inner ring does not have any flanges. The FCD type bearing is actually composed of two NN type bearings combined together. FC and FCD type bearings allow axial displacement in two directions between the shaft and the bearing housing. Therefore, such structures are suitable as floating-end bearings. The retainers for this type of bearing are mostly made as machined solid parts 13:58.

Are you a self-made dust cover? ? ? How is axial movement of the aluminum sheet ensured? How is it fixed? Does it come into contact with the bearings? If the above cannot be achieved, this must be the reason.

I can’t figure out what the purpose of adding this disk is Trying to prevent oil leakage by adding this plate is complete nonsense.

There’s a problem with the labyrinth seal at the bearing cover; is this aluminum sheet meant to seal the oil? It doesn’t serve any purpose at all. Moreover, with the high temperatures present now, the friction that occurs is due to the relative movement between this aluminum sheet and the shaft, or it’s caused by direct friction between the aluminum sheet and the bearings. Recommendation: Replace the bearing cover, or, depending on the situation, modify the bearing cover to have an oil seal for sealing.

An aluminum sheet was replaced to press against the outer ring of the bearing, and several small holes were made at the oil return groove. After reassembly, it operated normally

Putting that aluminum sheet there is pointless