Machined needle roller bearings

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Machined needle roller bearings

Needle bearings are specially designed for applications with high loads and limited installation space. They owe their name to the needle-like rolling elements. The rolling elements are elongated, cylindrical rollers with a length-to-diameter ratio that is large compared to the diameter. Needle bearings are used in a variety of applications, especially in gearboxes, packaging machines, and tool machines. Due to their design, radial needle bearings have a remarkably high radial load capacity.

If only a limited installation space is available, needle bearings without inner rings (needle roller cages, needle sleeves, needle bushes) can also be used. However, this requires that the surface on which the needles run must be hardened and ground.

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Innenringe 1R130X145X35 130x145x35mm NTN

Innendurchmesser: 130 mm

Außendurchmesser: 145 mm

Breite: 35 mm

Gewicht: 0.932000 kg

€57.70
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Innenringe 1R50X55X35 50x55x35mm NTN

Innendurchmesser: 50mm

Außendurchmesser: 55mm

Breite: 35mm

Gewicht: 0.129000kg

€11.82
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Innenringe IR130-145-35 130x145x35mm INA

Innendurchmesser: 130 mm

Außendurchmesser: 145 mm

Breite: 35 mm

Gewicht: 0.850000 kg

€96.58
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Innenringe IR55-60-35-EGS 55x60x35mm INA

Innendurchmesser: 55 mm

Außendurchmesser: 60 mm

Breite: 35 mm

Gewicht: 0.121000 kg

€34.01
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Innenringe IR55X60X35 55x60x35mm NKE

Innendurchmesser: 55mm

Außendurchmesser: 60mm

Breite: 35mm

Gewicht: 0.120000kg

€12.98
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Innenringe IR65-73-35-EGS 65x73x35mm INA

Innendurchmesser: 65 mm

Außendurchmesser: 73 mm

Breite: 35 mm

Gewicht: 0.231000 kg

€57.80
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Innenringe IR80-90-35-EGS 80x90x35mm INA

Innendurchmesser: 80mm

Außendurchmesser: 90mm

Breite: 35mm

Gewicht: 0.356000kg

€68.35
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Inner rings 1R140X155X35 140x155x35mm NTN

Inner dimension: 140 mm

Outer dimension: 155 mm

Width: 35 mm

Weight: 0.998000 kg

€68.78
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Inner rings 1R55X60X35 55x60x35mm NTN

Inner dimension: 55 mm

Outer dimension: 60 mm

Width: 35 mm

Weight: 0.134000 kg

€13.35
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Inner rings 1R60X68X35 60x68x35mm NTN

Inner dimension: 60 mm

Outer dimension: 68 mm

Width: 35 mm

Weight: 0.242000 kg

€15.21
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Inner rings 1R70X80X35 70x80x35mm NTN

Inner dimension: 70 mm

Outer dimension: 80 mm

Width: 35 mm

Weight: 0.313000 kg

€22.60
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Inner rings 1R75X85X35 75x85x35mm NTN

Inner dimension: 75 mm

Outer dimension: 85 mm

Width: 35 mm

Weight: 0.335000 kg

€27.49
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Showing 1-12 of 203 item(s)

Needle roller bearings are available in different designs. Each of them addresses different requirements and is suitable for different applications.

The simplest ones are needle cages. They consist of needle rollers loosely held in a cage, which run directly on the corresponding surfaces of the shaft and housing. Needle cages enable cost-effective bearings with minimal radial height, provided that the running surfaces are hardened and ground.

Needle sleeves and needle bushings consist of a needle cage running in a cold-formed, deep-drawn outer ring made of hardened steel sheet. The thin-walled outer ring, which is not ground, assumes its final shape by pressing into the bearing bore and requires sufficient support to utilize the maximum load capacity of the bearing. This support is ensured by firm housing fits, usually without additional axial fixation.

Needle sleeves are open on both sides. They are typically used as non-locating bearings. The needle bushings are closed on one side and can also accommodate low axial forces due to their profiled bottoms. They are well suited for final position bearings at shaft ends.

Needle sleeves and needle bushings typically run directly on the shafts, which must act as raceways. Here, too, it is necessary for the running surface to be hardened and ground.

Inner rings are used whenever the shaft cannot be used as a suitable raceway for needle cages, needle sleeves, needle bushings, or needle bearings, due to lack of hardening, grinding, or similar conditions. They have finely machined or ground optimal raceways for the needle rollers.

Sealed versions of needle bearings and needle bushings are also available. Depending on the design, one or two sealing lips are integrated into the outer ring. While needle bushings have only one seal on the open side of the outer ring, needle sleeves are available with either one-sided sealing or with sealing on both sides.

Adjustable needle bearings stand out due to the possibility to make axial adjustments, for example, to compensate for misalignments between the shaft and housing.

A special type of needle bearings are the clutch bearings. These are one-way clutches consisting of thin-walled outer rings with clamping ramps, plastic cages, pressure springs, and needle rollers. These components allow the transmission of torque in one direction and are characterized by their radial compactness.