Type NRT (with NRV)
This roller recirculating unit is designed for medium to heavy loads. Solutions to demanding applications can be created using NRT, NRV, and suitable guideways. NRT, NRV and the guideway are three independent components that together form a complete high-rigidity, high-load-capacity linear motion system, particularly suited to high-precision, heavy-load applications.
Benchmark data
| Supporting structure | Hardened and ground with high precision |
|---|---|
| Materials |
|
| Speed | 1 m/s |
| Acceleration | 50 m/s² |
| Operating temperatures | -40°C to +80°C |
Advantages/benefits of the NRT
- Two independent tracks, the small amount of roller play and the optimal ratio of roller length and roller diameter are responsible for minimal lateral forces.
- The large number of rollers and the optimised roller run-ins are responsible for minimal travel pulsation and a low coefficient of rolling friction
- High degree of rigidity thanks to three-point support on the rear
- Protected roller return
- Double-lipped wipers on each side
- Can also be supplied matched as an option, sorted within 5 µm
System combination
The Type NRT recirculating unit is used together with the Type NRV preload wedge and installed on a suitable linear guideway to form a complete linear motion system.
- Type NRV: preload wedge, used for setting preload; its concave and convex supporting surfaces also compensate for minor angular errors and deformations in the connecting structure
- Suitable linear guideway: selected according to the application requirements
Dimensions and load capacities of type NRT
Dimension drawing
¹ lubricating nipple Ø4 type D1a on both sides
² Lubricating hole
Recirculating unit type NRT
| Type and size | Weight in g | Dimensions (mm) | C in N | Options (see chapter 8) | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A | B | Dw | G | Kt | L | L1 | L2 | Lw | N | d | e | f | f1 | g | g1 | m | ||||
| NRT 19077 | 185 | 19 | 27 | 5 | 18.85 | 45 | 77 | 25.5 | 49.2 | 13 | 20.6 | 6 | M4 | 3.3 | 6 | 15.5 | 6 | 5.3 | 43,000 | GP ZS |
| NRT 26111 | 570 | 26 | 40 | 7 | 25.85 | 70 | 111 | 44 | 75.6 | 19 | 30 | 8 | M6 | 5 | 9 | 20 | 10 | 10.3 | 98,000 | GP ZS |
| NRT 26132 | 721 | 26 | 40 | 7 | 25.85 | 91 | 132 | 68 | 96.6 | 19 | 30 | 8 | M6 | 5 | 9 | 20.6 | 10 | 10.3 | 120,000 | GP ZS |
| NRT 38144 | 1,390 | 38 | 52 | 10 | 37.8 | 90 | 144 | 51 | 96.8 | 26 | 41 | 11 | M8 | 6.8 | 11 | 29 | 14 | 14.5 | 181,000 | GP ZS |
Type NRV preload wedge
The Type NRV preload wedge is used together with the Type NRT recirculating unit to provide system preload, ensuring high rigidity and precision. The NRV preload wedge features an adjustable design with setting screws, lubricating holes and locking screws.
The concave and convex supporting surfaces of the NRV preload wedge evenly distribute angular errors.
Dimension drawing
¹ Setting screw
² Lubricating hole
³ Locking and jacking screws
Preload wedge NRV
| Type and size | Weight in g | Dimensions (mm) | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A | B | H max. | L max. | L1 | L2 | L3 | L4 max. | L5 | L6 | N | b | b1 | d | d1 | e | e1 | f | g | ||
| NRV 19077 | 195 | 16 | 27 | 7 | 72 | 25.5 | 22.5 | 16.5 | 68 | 61 | 56 | 20.6 | 7 | 9 | 7 | 9 | M4 | M3 | 3.3 | 4.5 |
| NRV 26111 | 670 | 25 | 40 | 8 | 105 | 44 | 29 | 21 | 98 | 90 | 83 | 30 | 9 | 17.5 | 8 | 11 | M6 | M4 | 5 | 8 |
| NRV 26132 | 837 | 25 | 40 | 8 | 126 | 68 | 27.5 | 19.5 | 119 | 111 | 104 | 30 | 9 | 29.5 | 8 | 11 | M6 | M4 | 5 | 8 |
| NRV 38144 | 1,300 | 30 | 52 | 8 | 130 | 51 | 37.5 | 28.5 | 121 | 113 | 105 | 41 | 10 | 20.5 | 11 | 14 | M8 | M6 | 6.8 | 8 |
Notes:
- The NRV preload wedge must be used with the corresponding NRT recirculating unit size
- Provides adjustable preload
- Equipped with setting screws, lubricating holes and locking screws