Артикул: RX8540
Torque-Resistant Linear Bushings R0727, rotational flanged, with four ball guide grooves KBDR4-LR-..-DD
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Description
- For self-supporting, torsionally stiff guides with only one shaft
- With four ball guide grooves for transferring torque
- Matching shaft profiles with machined ball guide grooves
- Shafts machined to customer specification
- Integrated cross-roller bearing with initial lubrication
Features
- Hardened and machined outer sleeve
- POM ball retainer
- Balls made of rolling bearing steel
- Integrated wiper seals
Technical data
General technical data
| Ø d 1) | mm | 20 | 25 | 30 | 40 |
| amax | m/s² | 150 | |||
| vmax | m/s | 3 | |||
| m | kg | 0.45 | 0.75 | 1.25 | 2.3 |
| MA 2) | Nm | 3.9 | 12.7 | 29.4 | |
| Operating conditions | |||||
| Permissible ambient temperature (min ... max) | -10 °C ... +80 °C | ||||
| 1) | Actual shaft diameter varies |
| 2) | Tightening torque at friction factor 0.125 |
Load capacities and load moments
| Ød 1) | mm | 20 | 25 | 30 | 40 | |
| C 2) | N | 6200 | 9800 | 14800 | 24400 | |
| C0 2) | N | 11300 | 16100 | 23200 | 37500 | |
| Mt | Nm | 66 | 129 | 229 | 500 | |
| Mt0 | Nm | 133 | 239 | 412 | 882 | |
| Cross-roller bearing | C | N | 5900 | 9110 | 13200 | 22800 |
| C0 | N | 7350 | 11500 | 18000 | 32300 | |
| Speed limit | rpm | 1200 | 1000 | 800 | 600 | |
| 1) | Actual shaft diameter varies |
| 2) | The load ratings indicated are minimal values as the orientation and direction of load cannot always be clearly defined. |
| The load ratings are based on a total travel of 100, 00 m. When based on 50 000 m, the values in the table need to be multiplied by 1.26. |
Legend
| Symbol | Description | Unit |
| Ød | Shaft diameters | mm |
| amax | Maximum acceleration travel | m/s2 |
| C | Dynamic load capacity | N |
| C0 | Static load capacity | N |
| m | Mass | kg |
| MA | Tightening torque | Nm |
| Mt | Dynamic torsional moment load capacity | Nm |
| Mt0 | Static torsional moment laod capacity | Nm |
| vmax | Maximum permissible speed | m/s |
Reduced load capacity with short stroke
In case of short stroke, the service life of the shaft is less than that of the torque-resistant Linear Bushing. The dynamic load ratings C in the tables must therefore be multiplied by the factor fs .
| 1) | fs = factor |
| 2) | s = movement path |
Service life, shaft straightness, stabilized installation
Definition of dynamic load ratings
Dimensions
| a) | M6 x 0.75 lube port for cross-roller bearing, L3 thread depth |
| b) | Concentricity tolerance |
| c) | Recommended installation |
| d) | Fixing screw |
| e) | Lube nipple |
Dimensions
| Ød 1) | mm | 20 | 25 | 30 | 40 | |
| Ød ‒ actual | mm | 18.2 | 23 | 28 | 37.4 | |
| D | h7 | mm | 40 | 50 | 61 | 76 |
| D1 | h7 | mm | 66 | 78 | 100 | 120 |
| D2 | mm | 34 | 40 | 47 | 62 | |
| D3 | mm | 34 | 42 | 52 | 64 | |
| D4 | mm | 56 | 68 | 86 | 104 | |
| L | 60 mm -0.2 | 70 mm -0.3 | 80 mm -0.3 | 100 mm -0.3 | ||
| L1 | mm | 13 | 16 | 17 | 20 | |
| L1 | 13 mm | 16 mm | 17 mm | 20 mm | ||
| L2 | mm | 12 | 13 | 17 | 23 | |
| L3 | mm | 5.2 | 6.4 | 6.8 | 8 | |
| S | mm | 4.5 | 6.6 | 9 | ||
| S1 | M4 | M5 | M6 | |||
| t | mm | 7 | 8 | 10 | ||
| Fixing screw | M4 | M6 | M8 | |||
| 1) | Actual shaft diameter varies |
Project planning information
Life expectancy calculation
Mounting
Installation
Radial clearance: approx. ± 5 μm
Align the tracks and wiper seals when inserting the shaft and make sure they are not skewed!
Attention:
Do not loosen the flange connection (cross-roller bearing). Tighten the fastening bolts in phases until the table value is reached.
General mounting instructions
Commissioning
Initial lubrication
Linear bushings do not come with initial lubrication. Grease the Linear Bushings before use. Service life data is based on initial lubrication and relubricated Linear Bushings.
Maintenance
Note on lubrication:
The Linear Bushing must be initially lubricated and removed from the shaft for relubrication. The cross-roller bearing comes with initial lubrication and can be relubricated via the lube port.
Lubrication
Certification
Directives and standards
Safety Instructions
Notes
Ordering codes
Material numbers
| Ød 1) | Part number | Seals | Lubrication | Raceway | Short product name | CAD data | Buy |
| mm | |||||||
| 20 | R072722000 | With two integrated wiper seals | No initial lubrication | 4 ball guide grooves | KBDR4-LR-20-DD | ||
| 25 | R072722500 | KBDR4-LR-25-DD | |||||
| 30 | R072723000 | KBDR4-LR-30-DD | |||||
| 40 | R072724000 | KBDR4-LR-40-DD |
| 1) | Actual shaft diameter varies |
Legend
| Symbol | Description | Unit |
| Ød | Shaft diameters | mm |
Explanation of short product name using sample torque-resistant Linear Bushing KBDR4-H-20DD
| Example torque-resistant Linear Bushing | KBDR4-H-20DD | |
| Type | Linear bushing | = KB |
| Series | Torque | = DR |
| Compact | = C | |
| Raceway | Four ball guide grooves | = 4 |
|
| Sleeve design | = H |
| Flange | = F | |
| Miniature flanged | = FM | |
| With rotation ball bearing | = LR | |
| Size | = 20 | |
| Seal | With two seals | = DD |
| With 1 seal | = D | |
Explanatory example of the short product name
| KB | DR | 4 | LR | 20 | DD |
| Linear bushing | Torque | 4 ball guide grooves | With rotation ball bearing | Size 20 | Integrated wiper seals |
See "Precision steel shafts, R0724 0 Four ball guide grooves" for matching shafts.
Downloads
 | Torque-Resistant Linear Bushings Manual | R320103691 | 2003-08-01 | English, French, German, Italian | PDF | 143k Product Groups: Linear Bushings and Shafts |
| Linear Bushings Catalog | R999000488 | 2015-02-01 | English | PDF | 14.9MB Product Groups: Linear Bushings and Shafts |
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