Catalogue Crossed roller bearings
32Pages

Motion Control & Systems Crossed Roller Bearings www.hiwin.de

HIWIN GmbH Brücklesbünd 1 D-77654 Offenburg Phone +49 (0) 7 81 9 32 78 - 0 Telefax +49 (0) 7 81 9 32 78 - 90 info@hiwin.de www.hiwin.de All rights reserved. Complete or partial reproduction is not permitted without our permission. Note: The technical data in this catalogue may be changed without prior

Motion Control & Systems Rolling Bearings Crossed Roller Bearings HIWIN crossed roller bearings consist of an inner ring, an outer ring, and cylindrical rollers arranged at 90° with spacers between them. This crosswise arrangement of cylindrical rollers means that only the one bearing can absorb axial forces from both directions, radial forces, overturning torque loads, and any combination of these. HIWIN crossed roller bearings are very rigid with highly compact dimensions and a high running precision.

Crossed Roller Bearings Contents

Motion Control & Systems 2.3 Layout of crossed rotter bearings 8 2.4 Order code for crossed rotter bearings 9 2.5 Crossed rotter bearings series 9 3.1 Setecting a crossed rotter bearing 14 3.4 Securing and designing the bearing seat and mounting ftange 17

Product overview 1. Product overview Crossed roller bearings CRBA o Solid inner ring o Two-part outer ring o For inner ring rotation Page 21 Crossed roller bearings CRBB o Two-part inner ring o Solid outer ring o For outer ring rotation Page 22 Crossed roller bearings CRBC o Solid inner ring o Solid outer ring o For inner and outer ring rotation Page 23 Crossed roller bearings CRBD o Two-part outer ring o For inner ring rotation o With mounting flange Page 24 Crossed roller bearings CRBE o Solid inner and outer ring o For inner and outer ring rotation o With mounting flange

Motion Control & Systems Crossed roller bearings CRBX o individual connecting geometry o individual flange bores o individual surface treatment

2. General information 2.1 Properties HIWIN crossed roller bearings are characterised by high rigidity, very high concentricity, and high torque loading in all directions. Thanks to these advantages, they are ideal for applications e.g. in industrial automation systems, robots, machine tools, precision rotary tables, measuring machines, and medical equipment. The HIWIN range encompasses six different series of crossed roller bearings. 2.2 Advantages o Patented design for high loadability o High rigidity o Simultaneous loading in all directions o Low-friction rotation o Compact, space saving...

Motion Control & Systems 2.4 Order code for crossed roller bearings Accuracy class: P2: CRBA, CRBB, CRBC, CRBE P4: CRBA, CRBB, CRBC 3), CRBD, CRBE 3) P5: CRBA 3), CRBB 3), CRBD 3) Preload: C8: Preloaded (standard), see Table 2.12 C1: Slight play Seals: WW: Seals grinding on both sides (standard) NN: Open type without seals Series: CRBA: With split outer ring CRBB: With split inner ring CRBC: With solid inner and outer ring CRBD: With split outer ring and mounting flange CRBE: With solid inner and outer ring and mounting flange CRBX: Customer specific model Bearing inner diameter- Bearing...

Crossed Roller Bearings General information 2.6 Seals Bearings fitted with seals grinding on both sides effectively prevent foreign bodies from penetrating the track and lubricant from leaking out. The open models without seals are characterised by a lower frictional resistance. These bearings are particularly suitable for low-torque applications. 2.7 Accuracy Table 2.2 Tolerance of the bearing’s internal diameter – CRBA, CRBB, CRBC Inner diameter d [mm] Over Inner diameter tolerances ∆ dmp Up to Unit: µm Note: the value dmp is the arithmetic mean of the maximum and minimum internal...

Table 2.5 Tolerance of the bearing’s external diameter – CRBD, CRBE Outer diameter D [mm] Outer diameter tolerances ∆ Dmp Unit: µm Notes: the value Dmp is the arithmetic mean of the maximum and minimum outer diameter Table 2.6 Tolerance of the inner ring width B and outer ring width T – CRBA, CRBB, CRBC Tolerances of the inner and outer ring width Δ Bs, Δ Ts Table 2.7 Tolerance of the inner ring width B and outer ring width T – CRBD, CRBE Tolerances of the inner and outer ring width Δ Bs, Δ Ts Inner ring: CRBD Inner and outer ring: CRBE High Outer ring: CRBD

General information Table 2.8 Rotational accuracy of the inner ring - CRBA, CRBC

Motion Control & Systems Table . Rotational accuracy of the inner and the outer ring - CRBE

Crossed Roller Bearings Design properties and selection 3. Design properties and selection 3.1 Selecting a crossed roller bearing The choice of crossed roller bearing depends on the conditions of use. Confirmation of application conditions Service life —> Dynamic load capacity Rotation type and assembly method Bearing dimensions CRBA CRBB CRBC CRBD CRBE CRBX Ambient conditions —> Sealing Rigidity —> Preload class Accuracy —> Accuracy class Bearing specifications 3.2 Formulae 3.2.1 Dynamic equivalent load When radial and axial loads as well as torques are acting on the bearing, all loads can...

Motion Control & Systems 3.2.3 Static equivalent load The statically equivalent load P0 is a calculated theoretical load. It exerts the same load on the centre of the contact site under the highest load between the rolling element and the track as the actual effect of the combined load. Static equivalent load [N] Radial load [N] Axial load [N] Torque [Nmm] Roller's half-height diameter [mm] 3.2.4 Static load safety factor The static structural safety fS is the ratio of the static load rating C0 and the equivalent static load P0 (F 3.4). The recommended static structural safety based on the...

Crossed Roller Bearings Design properties and selection 3.2.5 Example calculation of nominal service life and static structural safety L Bearing CRBA 15025 WW: Inner diameter d Outer diameter D Roller’s half-height diameter DPW Dynamic load rating C Static load rating C0 W1 W2 Radial load Fr L Calculation: Radial load: Axial load: Torque: Roller’s half-height diameter: 3,000 Fa ≈ 0.297 < 1.5 = Fr + 2M/Dpw 3,000+2×640,000/180 Radial load coefficient X = 1; axial load coefficient Y = 0.45 Dynamic equivalent radial load: Static equivalent radial load: Nominal lifetime: Static load safety factor: