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ROBA®-ES

Product catalog summary

Company Overview
Mayr® Power Transmission, established in 1897, is a prominent German company specializing in power transmission solutions. With a global workforce of over 1200 employees, the company offers a diverse range of products such as torque limiters, safety brakes, and shaft couplings. Known for its innovation and tradition, Mayr® delivers high-quality, customer-specific solutions worldwide.

Product Overview: ROBA®-ES Couplings
The ROBA®-ES is a backlash-free elastomer coupling designed for various industrial applications. It features elastomeric elements that determine torque, rigidity, damping, and misalignment capabilities. These elements are crafted from a unique polyurethane material, providing high dimensional accuracy and resistance to agents like mineral oils and fuels.

Design and Specifications
ROBA®-ES couplings come in several designs, including key hubs, clamping hubs, and shrink disk hubs, each catering to specific installation needs such as fast assembly or high precision. Available in different sizes and materials, aluminum is used for smaller sizes and steel for larger ones.

Performance and Applications
These couplings offer vibration damping, backlash-free torque transmission, and compensation for shaft misalignments. They are maintenance-free and suitable for blind assembly, with ATEX designs available for explosive environments.

Technical Data
The document provides detailed technical specifications, including dimensions, torque capacities, and material properties for various sizes of ROBA®-ES couplings. It also includes guidelines for coupling dimensioning and installation procedures.

Specifications
The document outlines recommended hub/shaft tolerances, transmittable torques dependent on bore size, and maximum speeds for different coupling designs. It specifies mass moments of inertia and weights for each component, valid for one elastomeric element and maximum bore.

Dimensions and Sizes
Detailed dimensions are provided for each coupling type, including minimum and maximum hub bores, tightening torque for clamping screws, and other critical measurements such as length, diameter, and thickness. Tables list available bore sizes for each coupling type.

Materials and Design
Couplings are available in aluminum design up to size 38 and steel design from size 42. Elastomeric element hardness options include 98 Sh A (red), 92 Sh A (yellow), 80 Sh A (blue), 64 Sh D (green), and 72 Sh D (grey).

Ordering Information
The document provides order numbers for different coupling types and sizes, with examples of how to specify bore size and elastomeric element hardness when placing an order.

Technical Data
Includes maximum operating speeds for single-joint and double-joint couplings, as well as tightening torque required for clamping screws. Guidelines for calculating coupling torque based on nominal power and dynamic torques are also provided.

Additional Notes
The document reserves the right to make dimensional and constructional alterations and notes that further sizes are available upon request.

Torque Comparison and Dimensioning
The coupling must be designed to ensure loads do not exceed permitted values in any operating state, including nominal torque, torque impacts, resonance passing, and alternating torque in cycle operations. Specific formulas are provided for these calculations.

Misalignment Inspection
Permitted misalignments include axial, radial, and angular displacements. Additional considerations are necessary if multiple misalignments occur simultaneously.

Frictional Locking Inspection
The transmittable torque (TR) must exceed the maximum torque (Tmax) occurring in the coupling, with values provided in specific tables.

Technical Explanations
Detailed explanations are provided for torque determination, impact factors, peak torque, resonance effects, and frequency dependencies. The importance of selecting appropriate torsional spring rigidity to manage resonance is discussed.

Service Factors and Material Specifications
Service factors for coupling dimensioning are outlined, including resonance and speed factors. The document specifies hardness and temperature ranges for elastomeric elements used in couplings.

Permitted Speeds and Misalignment Values
Permitted speeds for different sleeve lengths are specified, with recommendations for operating at subcritical levels. Misalignment values are provided for various sizes and types of elastomeric elements.

Transmittable Torques
Tables detail transmittable torques for different hub types, including shrink disk hubs, clamping hubs, and split clamping hubs, with specifications for bore sizes and material types.

Specifications
Detailed specifications for various components, including expansion hubs and clamping hubs, are provided. The importance of fit clearance in torque transmission is highlighted.

Procedures
Outlines procedures for balancing key hubs, clamping hubs, and shrink disk hubs, emphasizing the need for balancing at higher speeds and providing reference values for balancing.

Technical Explanations
The ROBA®-ES coupling is described as a flexible, backlash-free shaft coupling suitable for high-speed operations, compensating for radial, axial, and angular shaft misalignments without losing functionality.

Recommendations
Balancing is recommended for shrink disk hubs above certain speeds to ensure smooth operation. Various parameters like rigidity and distance to adjacent bearings should be considered for optimal performance.

Contact Information
Contact details for various representatives and branch offices worldwide are provided, including locations in Germany, China, Great Britain, France, Italy, Singapore, Switzerland, USA, Australia, India, Netherlands, Poland, South Korea, Czech Republic, Austria, Turkey, Taiwan, and Japan.

Catalog excerpts

your reliable partner

Open the catalog to page 1

We safeguard the movements of this world Specialists in power transmission for more than a century ® mayr power transmission is one of the most traditional and yet most innovative German companies in the field of power transmission. From modest beginnings in the year 1897, the family enterprise from the Allgäu region has developed into the world market leader. Today, 700 employees work at the headquarters in Mauerstetten; more than 1200 employees work for the company worldwide. An unsurpassed standard product range The Christian Mayr mill-construction business – founded in 1897. ® mayr power...

Open the catalog to page 2

Tradition and innovation do not contradict each other - on the contrary. They are the two supporting pillars which have guaranteed stability and reliability for generations. Longterm stability, independence as well as a good reputation and satisfied customers are important values for a family enterprise rich in tradition. Therefore, we place emphasis on: • Tested product quality, • Optimum customer service, • Comprehensive know-how, • Global presence, • Successful innovations and • Effective cost management. By pursuing our own objective of always offering our customers the technologically most...

Open the catalog to page 3

your reliable partner • Vibration damping • Damping behaviour can be selected through elastomeric elements in different Shore hardnesses • Backlash-free torque transmission through pre-tensioned elastomeric element • Compensation of shaft misalignments • Plug-in connection, therefore suitable for blind assembly • Maintenance-free, media-resistant, temperature-stable • Torsionally flexible on a small scale, but two to four times more rigid than toothed belt drives. ROBA®-ES Elastomeric Elements The elastomeric elements are the central element of the ROBA®-ES-coupling. They define the application...

Open the catalog to page 4

your reliable partner ROBA®-ES Contents Designs ROBA®-ES with key hubs • Single-jointed coupling • Double-jointed coupling short • Double-jointed coupling with sleeve ROBA®-ES couplings are delivered as un-bored hub design (further processing to be carried out customer-side) or with a finish bore and keyway JS9 (DIN 6885/1). An adjusting screw is located in the hub for axial securement. Up to Size 38, the hubs are made of aluminium. From Size 42, they are made of steel. Conventional bores can be delivered from stock. ROBA®-ES with clamping hubs • Single-jointed coupling • Double-jointed coupling...

Open the catalog to page 5

your reliable partner ROBA®-ES with aluminium shrink disk hubs • Single-jointed coupling • Double-jointed coupling short On this design, the hub body is made of aluminium and the ring of phosphated, annealed steel. The design is constructionally identical to the P-design (page 19). The symmetry, the absence of keyways and radial bores produces an optimum shaft run-out. Therefore, much higher speeds are possible compared to the other hub designs (please observe Diagram 1 “Balancing the shrink disk hub”, page 31). The torque is transmitted via frictional locking onto the shaft. Please observe the...

Open the catalog to page 6

your reliable partner ROBA®-ES elastomer couplings Type 94_. Clamping hub 1) / Clamping hub Compact Type 94_._0_ / 94_._5_ Shrink disk hub Type 94_._1_ Elastomeric element Hardness [Shore] 80 SH A 92 SH A 98 SH A 64 Sh D 72 Sh D Clamping hub 1) / Clamping hub Compact Type 94_._ _0 / 94_._ _5 Single-jointed coupling Type 940.___ Split clamping hub 1) Type 94_._ _3 Double-jointed coupling with sleeve (variable length) Type 943.___ 11 If required also available with keyway Shrink disk hub Type 94_._ _1

Open the catalog to page 7

your reliable partner ROBA®-ES with key hubsSingle-jointed coupling / Type 940._ 22. The adjusting screw is offset by 180°to the keyway on Sizes 14 to 42 (see Fig. above). We reserve the right to make dimensional and constructional alterations.

Open the catalog to page 8

Double-jointed coupling short / Type 942._ 22. Double-jointed coupling with sleeve / Type 943 Order Number 2 Double-jointed coupling short 3 Double-jointed coupling with sleeve Size Elastomeric Aluminium design up to Size 38 Steel design from Size 42 Table) Table) Operating speed nS [rpm] for sleeve 2) In order to dimension the shaft-hub connection, the calculation procedure acc. DIN 6892 is to be applied For the calculation, please take the yield point Rp 0.2 = 200 N/mm2 for aluminium and the yield strength Re = 350 N/mm2 for steel. 3) Also applicable for double-jointed design 4) Not valid for...

Open the catalog to page 9

<-> mayr your reliable partner ROBA®-ES with clamping hubs Single-jointed coupling / Type 940._ 00._ Mass moments of inertia J [10-3 kgm2] 5) 6) Size Stock program

Open the catalog to page 10

Double-jointed coupling short / Type 942._ 00. Double-jointed coupling with sleeve / Type 943, Order Number 2 Double-jointed coupling short 3 Double-jointed coupling with sleeve Aluminium design up to Size 38 Steel design from Size 42 Table) Table) A Operating speed nS [rpm] for sleeve 1) Recommended hub / shaft tolerance: F7 / k6 2) Transmittable torques dependent on bore, see page 28. 3) Also applicable for double-jointed design 4) Not valid for designs with sleeve (see diagram: “Permitted speeds for sleeve” on page 26) 5) Mass moments of inertia and weights are valid for one elastomeric element...

Open the catalog to page 11

O mayr your reliable partner ROBA®-ES with clamping hubs Compact Single-jointed coupling / Type 940._ 55._ Mass moments of inertia J [10-3 kgm2] 5) 6) Size We reserve the right to make dimensional and constructional alterations.

Open the catalog to page 12

Double-jointed coupling with sleeve / Type 943._55. Order Number 0 Single-jointed coupling Sleeve length 2 Double-jointed coupling short Hs [mm] 3 Double-jointed coupling with sleeve Size Elastomeric Aluminium design up to Size 38 Table) Table) A Operating speed nS [rpm] for sleeve 1) Recommended hub / shaft tolerance: F7 / k6 2) Transmittable torques dependent on bore, see page 28. 3) Also applicable for double-jointed design 4) Not valid for designs with sleeve (see diagram: “Permitted speeds for sleeve” on page 26) 5) Mass moments of inertia and weights are valid for one elastomeric element...

Open the catalog to page 13

ROBA®-ES

ROBA®-ES

Catalog excerpts

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