Planetary roller screws SRR | Trục vít con lăn hành tinh Roller screw chính Hãng được sử dụng rộng rãi trong nhiều ứng dụng khác nhau, yêu cầu độ chính xác cao và tải trọng lớn.
A rotating nut planetary roller screw assembly is designed to function like an electro-mechanical cylinder, and is recommended for applications where space is limited. The basic assembly consists of a housing, two angular contact ball bearings and a roller screw nut. In the case of direct drive, a customer supplied hollow motor drives the screw nut. In the case of indirect drive, a customer supplied pulley or gear, attached to the back of the roller screw assembly is needed to drive the nut. The rotation of the nut translates the screw shaft which operates as a push tube of an electromechanical cylinder. The screw shaft must be fitted with an anti–rotation device and must be precisely guided.
Đặc tính trục vít con lăn hành tinh SRR
Planetary roller screws with a nut already fitted into a bearing housing
Maximum n d0 = 160 000 and acceleration up to 12 000 rad/s2
72 series angular contact ball bearings mounted in the housing are fitted with the nut and then adjusted for preload
Bearings in back–to–back preloaded arrangement
2 garter seals (2 shields for size d0 = 60 mm) protect the bearings against contaminants, making these assemblies relubrication-free under normal operating conditions
Wiper seals at each end of the nut of a standard assembly help to protect the nut from contaminants
A grease fitting for the bearings is located on the outside surface of the housing. Standard grease is SKF LGEP2. Specific grease is on request
Roller screw nut relubricated through conduits drilled in the screw shaft
Two versions are available: SRR with axial play
BRR without backlash
Ứng dụng
• Production processes in automotive industry (servo– presses, tube bending, forming, locking devices, etc.)
• Process in the injection moulding industry (part ejection)
• Short stroke and oscillating applications
Các loại trục vít con lăn hành tinh SRR
