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Description
- Low-cost Linear Bushing for high requirements
- Steel bearing plates with machined ball guide grooves and optimized ball lead-in chamfers for outstandingly smooth travel and a long service life
- Compensates for shaft deflection and misalignment up to 30'
- Open Linear Bushing on fully supported shafts for applications where other linear guides tend to warp due to imprecise substructures.
- High travel speed (5 m/s)
Features
- With longitudinal seal
- No initial lubrication
- Integrated wiper seals, external seals or no wiper seals
- Ball retainer and outer sleeve made of PA or POM
- Balls made of rolling bearing steel
Technical data
General technical data
| Ø d | mm | 12 | 16 | 20 | 25 | 30 | 40 | 50 | |||||||
| amax | m/s² | 150 | |||||||||||||
| vmax 1) | m/s | 3 | |||||||||||||
| m | kg | 0.018 | 0.022 | 0.051 | 0.102 | 0.155 | 0.3 | 0.48 | |||||||
| FR 2) 3) | N | 0.8 | 3 4) | 1 | 4 4) | 1.5 | 5 4) | 2 | 6 4) | 2.5 | 8 4) | 3 | 10 4) | 4 | 12 4) |
| Breakaway force 2) | N | 1.5 | 6 4) | 2 | 9 4) | 3 | 10 4) | 4.5 | 14 4) | 6 | 18 4) | 8 | 24 4) | 10 | 30 4) |
| μ 5) | 01 ... 025 | ||||||||||||||
| Rows of balls | 4 | 5 | |||||||||||||
| Shaft radial clearance h6/bore H7 | µm | + 38 + 10 | + 43 + 11 | + 50 + 12 | |||||||||||
| Shaft radial clearance h6/bore K7 | µm | + 23 - 5 | + 25 - 7 | + 29 - 9 | |||||||||||
| Shaft radial clearance h6/bore M7 | µm | + 17 - 11 | + 18 - 14 | + 20 - 18 | |||||||||||
| Operating conditions | |||||||||||||||
| Permissible ambient temperature (min ... max) | -10 °C ... +80 °C | ||||||||||||||
| 1) | Speeds of up to 5 m/s possible. Service life is limited by heightened wear to plastic parts. Tests have shown total travel from 50 • 105 m to 100 • 105 m without failure. |
| 2) | One wiper seal: Multiply by a factor of 0.5. |
| 3) | Frictional drags generated by Linear Bushings with integrated wiper seals on two sides when not under radial load. The frictional drags depend on speed and lubrication. |
| 4) | For fully sealed Linear Bushings |
| 5) | Friction coefficients of unsealed Linear Bushings when lubricated with oil. The friction coefficient is lowest under heavy load, but can still be above the specified value even under a low load. |
Load capacities and load moments
| Ød | mm | 12 | 16 | 20 | 25 | 30 | 40 | 50 |
| C 1) | N | 1060 | 1500 | 2570 | 4130 | 5020 | 8620 | 12500 |
| C0 1) | N | 510 | 830 | 1180 | 2250 | 2880 | 4480 | 6620 |
| 1) | The load ratings apply for the main direction of loading. |
| 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 |
| FR | Friction force | N |
| m | Mass | kg |
| vmax | Maximum permissible speed | m/s |
| μ | Friction coefficient |
For load in the direction of opening, please refer to the loading diagrams (see "Diagrams" section).
Impact of load direction on load rating of open Linear Bushings
The load ratings C and C0 apply for the main direction of loading ρ = 0°. For all other load directions, the load ratings must be multiplied by the factors fρ (dynamic load rating C) or fρ0 (static load rating C0).
Installing specific Linear Bushings can prevent reductions in load capacity (see Linear Set with side opening).
Reduced load capacity with short stroke
In case of short stroke, the service life of the shaft is less than that of the super Linear Bushing. The load ratings C specified in the tables must therefore be multiplied by the factor f.s .
Reduced load capacity with high load
If the load F on a Super Linear Bushing A is more than F > 0.5 x C, the dynamic load rating C decreases.
Definition of dynamic load ratings
Self-alignment feature
The self-alignment feature in the steel bearing plates and machined ball guide grooves ensure quieter travel. The flow chart shows a comparison with a conventional Linear Bushing. The example is based on a load of 800 N and misalignment of about 8 ft (caused by shaft deflection).
Due to the self-alignment feature, two super Linear Bushings must be used on at least one of the shafts in the guide.
| FR = Frictional drag | |
| s = travel distance | |
| v = travel speed | |
| a) | Super Linear Bushing, A Ød 20 |
| b) | Conventional Linear Bushing, Ød 20 |
Sealing
Super linear bushings come both with integrated and separate wiper seals. The separate wiper seals are specially designed for applications in high contamination environments. An additional seal (for example, bellows, extendable cover) is necessary for extremely high contamination environments. The open super linear bushings can also come fully sealed (with longitudinal seal), however this increases friction.
Diagrams/characteristic curves
Dimensions
Dimensions
| Ød | mm | 12 | 16 | 20 | 25 | 30 | 40 | 50 | |
| D | mm | 22 | 26 | 32 | 40 | 47 | 62 | 75 | |
| α | ° | 66 | 68 | 55 | 57 | 56 | 54 | ||
| C | h13 | mm | 32 | 36 | 45 | 58 | 68 | 80 | 100 |
| C1 | H13 | mm | 22.6 | 24.6 | 31.2 | 43.7 | 51.7 | 60.3 | 77.3 |
| C2 | mm | 1.3 | 1.6 | 1.85 | 2.15 | 2.65 | |||
| E 1) | mm | 6.5 | 9 | 11.5 | 14 | 19.5 | 22.5 | ||
| 1) | Minimum size in relation to Ø d. |
Project planning information
Life expectancy calculation
Mounting
Radial clearance
The radial clearance values shown in the table have been determined from statistics and correspond to values expected in practice.
Adjusting radial clearance
The radial clearance of all Linear Bushings can be adjusted. If, for instance, a zero-clearance guideway is needed, the radial clearance of the Linear Bushing must be reduced using the adjusting screw on the housing (see also Linear Sets) until slight resistance occurs when rotating the shaft. Secure the adjusting screw for applications where vibrations are present.
Adjusting preload
For preloading, the aforementioned adjustment is made using an adjustment shaft that is weaker by the degree of preload.
Customer-built housings
General mounting instructions
Commissioning
load errorMaintenance
load errorCertification
load errorSafety Instructions
load errorDownloads
 | Linear Bushings and Shafts Manual | R320103669 | 2005-07-01 | English, French, German, Italian | PDF | 3.6MB 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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