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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'
- High travel speed (5 m/s)
- No initial lubrication
Features
- 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 | 10 | 12 | 16 | 20 | 25 | 30 | 40 | 50 |
| amax | m/s² | 150 | |||||||
| vmax 1) | m/s | 3 | |||||||
| m | kg | 0.017 | 0.023 | 0.028 | 0.061 | 0.122 | 0.185 | 0.36 | 0.58 |
| FR 2) 3) | N | 0.5 | 0.8 | 1 | 1.5 | 2 | 2.5 | 3 | 4 |
| Breakaway force 2) | N | 1 | 1.5 | 2 | 3 | 4.5 | 6 | 8 | 10 |
| μ 4) | 01 ... 025 | ||||||||
| Rows of balls | 5 | 6 | |||||||
| Shaft radial clearance h6/bore H7 | µm | + 9 + 36 | + 38 + 10 | + 43 + 11 | + 50 + 12 | ||||
| Shaft radial clearance h6/bore K7 | µm | + 21 - 6 | + 23 - 5 | + 25 - 7 | + 29 - 9 | ||||
| Shaft radial clearance h6/bore M7 | µm | + 15 - 12 | + 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) | 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 | 10 | 12 | 16 | 20 | 25 | 30 | 40 | 50 |
| Cmin | N | 600 | 830 | 1020 | 2020 | 3950 | 4800 | 8240 | 12060 |
| Cmax | N | 820 | 1140 | 1400 | 2470 | 4820 | 5860 | 10070 | 14730 |
| C0min | N | 330 | 420 | 530 | 1050 | 2180 | 2790 | 4350 | 6470 |
| C0max | N | 480 | 620 | 780 | 1340 | 2790 | 3570 | 5570 | 8280 |
| 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 |
| Cmax | Maximum dynamic load rating | N |
| Cmin | Minimum dynamic load rating | N |
| C0max | Maximum static load rating | N |
| C0min | Minimum static load rating | N |
| FR | Friction force | N |
| m | Mass | kg |
| vmax | Maximum permissible speed | m/s |
| μ | Friction coefficient |
Impact of load direction on load rating of closed Linear Bushings
The listed load ratings should be chosen depending on installation in minimum or maximum position and should be based on the calculations. If the load direction is clearly defined and the Linear Bushings can be installed in maximum position, the load ratings Cmax. (dynamic load rating) and C0 max (static load rating) can be used. If aligned installation is not possible or the load direction is not defined, the minimum load ratings must be used.
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 .
| 1) | fs = factor |
| 2) | s = movement path |
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.
Dimensions
Dimensions
| Ød | mm | 10 | 12 | 16 | 20 | 25 | 30 | 40 | 50 | |
| D | mm | 19 | 22 | 26 | 32 | 40 | 47 | 62 | 75 | |
| C | h13 | mm | 29 | 32 | 36 | 45 | 58 | 68 | 80 | 100 |
| C1 | H13 | mm | 21.6 | 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 | ||||
| D1 | mm | 18 | 21 | 24.9 | 30.5 | 38.5 | 44.5 | 58.5 | 71.5 | |
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
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
Lubrication
Accessories
Metal cases for Super Linear Bushings and standard Linear Bushings
Metal cases for Super Linear Bushings and standard Linear Bushings
- Galvanized steel
Retaining rings, DIN 471, for Super Linear Bushings A and B
Retaining rings, DIN 471, for Super Linear Bushings A and B
Retaining rings, DIN 472, for Super Linear Bushings A and B
Retaining rings, DIN 472, for Super Linear Bushings A and B
Wiper seals for closed-type Super Linear Bushings and Standard Linear Bushings
Wiper seals for closed-type Super Linear Bushings and Standard Linear Bushings
- Galvanized metal case
- Elastomer wiper seal
Certification
Directives and standards
Safety Instructions
Notes
Downloads
 | 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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