*mydirectindustry

LeCo Dämmblock NRS

Product catalog summary

Specifications:
The LeCo Dämmblock NRS is a steel-reinforced elastomer bearing made from high-quality natural rubber with a Shore hardness of 47° ±2° A. It operates effectively within a temperature range of -25 °C to +50 °C, with short-term exposure up to +70 °C. It is resistant to water, alkalis, and acids, but not to oils and greases. Key dimensions include a length of 300 mm, width of 200 mm, and a rubber layer thickness of 22 mm, with an overall height of 79 mm. The permissible compressive stress is 3.38 N/mm², and the permissible shear stress is 1.42 N/mm².

Dynamic Characteristics:
The bearing allows for low-frequency tuning down to a natural frequency of about 6 Hz. The dynamic stiffening is approximately 1.2-1.5 cdyn/cstat, and the shear modulus G is about 0.65 – 0.70 N/mm². The permissible tilt is 0.7 times the layer thickness in mm. Static stiffness ranges from 29.24 to 36.07 KN/mm, while dynamic stiffness ranges from 42.02 to 51.84 KN/mm.

Long-term Behaviour:
The LeCo Dämmblock NRS exhibits low initial deformation and a very low degree of creep, with a creep rate of 2.4% per time decade. Its dynamic characteristics remain stable over long periods.

Fatigue and Creep Tests:
Fatigue tests by the Technical University Munich showed no significant changes in dynamic characteristics after 2.6 million load cycles. Long-term creep tests at the University of Applied Sciences, FH Koblenz, confirmed low deformation and creep, predicting stability over 100 years.

Installation Instructions:
Bearings should be installed precisely at specified points without lateral restriction on an even, clean surface. If a screwed connection is needed, counter-buffers and sleeves should be used to avoid sound bridges.

Fire and Tolerances:
The bearings are flammable and require fire protection. Tolerances in static rigidities are about ±10%, and natural frequencies vary by ±5%. Dimensional deviations conform to DIN 150 3302-1, class M 3.

Damping:
Typical loss angles range from 3 to 7 degrees, with damping ratios from 0.025 to 0.065. Higher excitation frequencies can achieve loss angles up to 20 degrees.

Production and Testing:
Production adheres to ISO 9001/2000 standards and is monitored by the Technical University Munich. The material is suitable for use in mass-spring systems, as verified by extensive testing.

Contact Information:
For further inquiries, contact ESZ W. Becker GmbH at Weilerhöfe 1, D-41564 Kaarst, Phone: +49 2131 75 81 00, Fax: +49 2131 75 81 11, Email: [email protected].

Catalog excerpts

WILFRIED BECKER GMBH Elastomer Service Zentrale LeCo Dämmblock NRS LeCo Dämmblock NRS Steel reinforced elastomer bearing Stahlbewehrtes Elastomerlager für vibration isolation and for die Schwingungsisolation und Körperschalldämmung structure-borne noise insulation → Hochbau construction --› Building → Maschinen- und Anlagenbau --› Machine and plant construction → Road construction

Open the catalog to page 1

Calculation/RFP/Installation LeCo Dämmblock NRS NR LeCo Lagertechnik/ESZ General material information Calculation no. Shear stress The LeCo Dämmblock NRS is a steel-reinforced elastomer bearing. The elastomer is made of a high-quality natural rubber (NR). The formula has been developed and optimised with regard to the application area. The shear modulus G for the material is about 0.65 – 0.70 N/ mm2. The permissible tilt is 0.7 x layer thickness in mm; example: a horizontal deformation of ±46.2 mm is permissible for the bearing on the adjacent calculation sheet with the dimensions 200 x 300 x...

Open the catalog to page 2

Open the catalog to page 3

Open the catalog to page 4

All ESZ Wilfried Becker GmbH catalogs and technical brochures

*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.

Brand list