LSA Specification
LSA – Slim Bearings
Product type
- 2 Race rings with profiled raceways
- Plastic cage with retained balls
- Franke slim bearings of type LSA deliver a convincingly smooth run, require extremely compact mounting space, ensure simple assembly and come at a favorable price.
Characteristics
- Simple, compact integration, LSA, infinitely variable Ø range
- Cost-effective alternative to standard slim bearings
- Not preloaded bearings
- Slim bearings type LSA consist of one inner and one outer race ring with hardened and profiled raceway and a plastic cage with retained balls. The rolling elements touch the race rings at two points each, hence ensuring the 4-point system. The race rings are separated; their diameter can therefore be altered elastically for mounting.
Diameter Range
- From 4″ to 30″
Mating structure
The slim bearing determines the overall construction’s load bearing capacity. Hence the mating construction can be made of alternative materials such as steel, aluminium or plastic. Axial and radial accuracy (see diagram below) are defined to a substantial extent by the mating components. These properties can be enhanced by boosting the accuracy of manufacture.
Constructive Example
Technical Details
| Material | Ball race rings: 54SiCr6, rolling elements: 100Cr6, cage: PA12 |
|---|---|
| Temperature in use | –30 °C to +80 °C, briefly up to +100 °C |
| Circumferential speed | max. 5 m/s, without seals max. 10 m/s |
| Lubricant grease | Klüber Isoflex Topas NCA52 or Shell Gadus S3 V220 |
| Lubricant schedule | See Technical Information |
| Tolerance details | See Technical Information |
Please find additional information on bearing selection, calculation, mounting and setting in‘Technical information’.
LSA 4 (4″ – 15″)Drawing
Loadings
Rotational resistance
The rotational resistance indicates the preload on the bearing assembly. It is dependent on the respective type and the race ring diameter. The values indicated in the diagram are standard values and can be aligned individually.
Radial and axial runout accuracy
The running accuracies indicated in the diagram are maximum values and may be improved by restricting the tolerances.
Please find additional information on bearing selection, calculation, mounting and setting in‘Technical information’.
LSA 6 (4.5″ – 15″)Drawing
Loadings
Rotational resistance
The rotational resistance indicates the preload on the bearing assembly. It is dependent on the respective type and the race ring diameter. The values indicated in the diagram are standard values and can be aligned individually.
Radial and axial runout accuracy
The running accuracies indicated in the diagram are maximum values and may be improved by restricting the tolerances.
Please find additional information on bearing selection, calculation, mounting and setting in‘Technical information’.
LSA 8 (5.5″ – 30″)Drawing
Loadings
Rotational resistance
The rotational resistance indicates the preload on the bearing assembly. It is dependent on the respective type and the race ring diameter. The values indicated in the diagram are standard values and can be aligned individually.
Radial and axial runout accuracy
The running accuracies indicated in the diagram are maximum values and may be improved by restricting the tolerances.
Please find additional information on bearing selection, calculation, mounting and setting in‘Technical information’.
Standard Cages
Strip cages for the LBK series
The band cage is segmented in the length required respectively and delivered fitted with balls and ready-to-use. The number of segments is dependent on the bearing diameter and the ball size. The band cage can also be created in one part for special applications.
Special Cages
Flat cages made of hard fabric, non-corrosive steel, brass.
It is mandatory to use a flat cage for temperatures exceeding 100 °C and with ball diameters larger than 20 mm. Special solutions, including complete non-corrosive properties or radiation resistance, are also possible.
Special cages in the form of band or prong-type cages are available for special requirements in terms of ambient conditions or mounting space.
Franke also delivers materials such as plastic, non-corrosive, brass and Teflon.
Washers
Larger bearings and bearing elements use washers to simplify adjustment between the separate inner and outer rings. The washers are made of non-corrosive sheet steel. It is sensible to include in the design specifications a theoretical initial gap of 0.5 mm for the adjustment.
Seals
By standard, the bearing assemblies are fitted with sleeve seals S120. Temperature: –30 °C to +80 °C (NBR).
Max. circumferential speed: 5 m/s.
The seals can be ordered by the meter in order to seal the construction (e.g. when using a bearing element). The joint is then bonded using adhesive agent Loctite 401®.
Call us for more information on 01772 780200
Advantages
Maximum design freedom, without compromising precision or load capacity.
Principle
4 Point ContactFreedom of Design
4 Point contact principle to take load from all directions. the rolling process does not take place directly between the rolling elements and the mating structure, but rather on special race rings, giving maximum freedom of design.
Compact
Minimal Mounting SpaceMinimal Mounting Space
Requiring only a small mounting space, the compact and highly resilient four-point geometry of Franke Bearings gives you maximum freedom of design, making an ideal design component for your application.
Material
Unlimited Material ChoiceUnlimited Material Choice
Franke lightweight aluminum bearings are 65% lighter than steel, offering substantial design freedom. Available in a wide range of materials, from aluminium, bronze ceramic, plastic, carbon, 3D printed and many more.
Bespoke
Built To Your ApplicationBuilt To Your Application
Available in sizes from 60 – 2000+ mm. 95% of our products are bespoke versions. Franke rotary solutions are always designed and built to fit your application. We work with you from concept, to prototype through to final testing.