Couplings
Couplers are used because they offer protection to the shaft support bearings from destructive radial and thrust loads due to misalignment and axial motion, respectively. Since all couplings resist misalignment and axial motion, it follows that those with least resistance can better protect the bearings.
- Does it provide adequate misalignment protection?
- Can it transmit the load torque?
- Do I need axial motion or axial stiffness?
- Can it sustain the required speed of rotation?
- Will it fit within the available space envelope?
- Can it operate at the designated ambient temperature?
- Does it provide the required torsional stiffness?
- Does it provide electrical isolation between shafts?
- Will it have the required life expectancy?
- Will it meet my cost expectations?
ERIKS offers the following couplings:
- Flexible rotating Shaft Couplings
- Oldham Disc Couplings
- Bellow Couplings
- Universal joints
- Machined Springs
Flexible rotating couplings
Flexible Roating Shaft Couplings Datasheet (949kB)
These couplings may operate in high or low speed drives with low inertia for reversing, non-reversing, stop-start or
fractional revolutions. Constant velocity and angular accuracy are assured because the driven hub turns the same as the driving hub.
Shaft misalignment is allowed without undue stress on shafts and bearings. The flexible shaftcoupling features zero backlash. No lubrication is required. There are no internal parts to wear or fatigue. The coupling may be used under extreme abrasive conditions.
The coupling is made from a single piece of solid material, light in weight and small in size. (Selfcentering action takes place in a single piece of material.) The flexure is made from corrosion resistant materials to withstand high temperatures, to perform in common or corrosive atmospheres and to allow both axial expansion and torque capacity.
Options
- Couplings and/or springs can be customized
Specifications material
- 17-4ph high strength stainless steel, natural
- 7075-T6 aluminium alloy, clear anodize
| Specifications shaft misaglignments |
|
|---|---|
| Angular | 5 degrees |
| Parallel Offset | 0,25mm (0,50 T.I.R.) |
| Axial Motion | ± 0,25mm |
Oldham Disc Couplings
Oldham Shaft Couplings Datasheet (927kB)
A robust, 3 part coupler rated for intermittent operation, the Oldham has zero backlash, high torsional stiffness and offers easy connection of drives in blind or difficult installations. They are widely used for motion control, typically in positioning tables, fluid delivery systems, optical systems and similar applications.
A key feature of the Oldham concept is the exceptional, flex-free, radial misalignment capability that it provides. As there are no restoring forces, bearing loads are low.
Torque is transmitted through a moulded disc that 'floats' to accommodate alignment errors and functions as a 'mechanical fuse'. Under severe overload it breaks cleanly giving some protection to personnel and equipment.
Discs are easily replaced and the pull-apart design permits de-coupling without removing hubs from shafts.
Characteristics
- backlash-free to 108 turns
- tolerant of pronounced radial misalignment
- flex-free mechanical action - low bearing loads
- mechanical fuse' function
- replaceable wear element
- selectable torsional stiffness
- non-magnetic
- electrically isolating
- low inertia
| Specifications |
|
|---|---|
| Couplings will compensate for shaftmisalignment | up to 1° |
| Speed | max. 3000 RPM |
| Material
|
- anodised aluminium hub
- acetal disc |
Bellow couplings
Flex-B Datasheet (179kB)
Precision couplers with excellent kinematic properties. The 3 types offer different combinations of stiffness, radial compensation and axial motion. For more detailed information, please look at the datasheet.
Characteristics
- high torsional stifness
- large axial misalignment
- replaceable wear element
- low inertia
| Specifications |
|
|---|---|
| Couplings will compensate for shaftmisalignment |
|
| Speed | up to 5000 RPM in standard form |
| Temperature range | -40 to +120 °C |
| Peak torque | 12,5 Ncm |
Typical applications
Applications include high-end servo drives, pulse generators, scanners, positioning slides, metering valves etc.
Universal joints
Huco Datasheet (179kB)
Huco Pol are light duty plastic universal joints and extensible drive shafts (teleshafts). Low mass, corrosion resistant, ideal where conventional steel joints would be under-utilized. For more detailed information, please look at the datasheet.
Characteristics
- low-cost
- lage angualair misalignment
- large torginal stifness
- electrical isolation between one end and the other end
| Specifications |
|
|---|---|
| Speed | up to 1000 RPM |
| Peak torque | 12,5 Ncm / 10,7 Ncm |
| Standard bores | Ø 3 to 20 mm to 0.7874" |
| Temperature range | 20 to +60 °C |
| Electrical isolating | yes |
| Connection | screw, bonding or cross-pinning |
Typical applications
Applications include intermittent applications in business machines, instrumentation, lab equipment, analytical apparatus, etc. where steel joints would be under-utilized.
Machined Spring
Application examples Datasheet (957kB)
What is a machined spring?
A Helical machined spring is a single piece of material machined into a spring configuration. Key to the versatility of the machined spring is the Helical Flexure, a flexible helix beam concept utilized in the manufacture of Helical machined springs. Because Helical springs are "machined" to specific design requirements, they provide more precise performance, features and functions than can other more traditional types of springs.
What are some of the advantages of machined springs over conventional springs?
With machined springs, desired features or functions can be made part of the spring, such as: special attachments, precise spring rates, multiple integral coils, and other special characteristics. These aspects are generally not possible with traditional springs. Machined springs also support multiple design objectives such as reliability, repeatability, and integration of multiple parts, which results in a reduction of assembly complexity.
Characteristics
- reduce the number of components
- reduce MTF
- increases mechanical design freedom
- can reduce overall cost
| Specifications |
|
|---|---|
| Compensate for shaftmisalignment | custom made |
| Speed | custom made |
| Material | custom made |
| Dimensions | custom made |
