SKF Roller Screws
In a ball screw the load is transmitted from the nut to the shaft through the balls engaged in the groove.
In a Roller Screw the load is transmitted from the nut to the shaft through the barrelled surfaces of all the engaged rollers.
There are two types of roller screw ~ planetary and recirculating.
Qualities of the planetary roller screw:
- Many strong contact surfaces leading to a high load carrying capacity.
- No recirculation and no contact between rolling elements enabling high rotational speeds.
- The rollers are guides meaning no loss in preload torque when changing direction.
- The timing mechanism gives exceptional reliability
Typical applications for planetary roller screws include; plastic moulding, valves, presses, machine tools, the steel industry, the tyre industry, automatic handling, military aircraft, tanks and the nuclear industry, amongst many others.
- Qualities of the recirculating roller screw:
- Very small leads providing fine resolution.
- No miniature parts which means they’re simple and robust
- Many strong contact surfaces leading to a high load carrying capacity
Typical applications for recirculating roller screws include; grinding machines, laboratory equipment, hospital equipment, paper making, and the printing industry amongst many others.
- Why use a roller screw?
- High load ratings ~ up to 1000 tonnes static
- Very high rotational speeds
- High acceleration and deceleration
- Long life at high cycling rates
- High reliability
- Resistance to hostile environments
- Ability to survive shock loads
- Small displacements with excellent repeatability
Download the SKF Roller Screw catalogue
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