NMRV series worm-gear reductors are important transmission machineries. They are fit for various mounting positions and with the features of light-weight, compactibility and flexibility, they fulfill the demands of customers very well. As the advanced solutions, they are widely used in many fields: food staff, chemical and industrial industry, textile industry, electronic equipments, conveyors equipments, cranes, metallurgy, printing and dying etc
Parameters of NMRV Series
WORM GEAR UNITS of NMRV40
Instructions on selection of product and motor
For correctly selecting a gear reducer or geared motor, several essential pieces of data are required: 1. The rotational input speed to the gear reducer (n1) and the rotational output speed (n2). Through these two values it is possible to calculate the reduction ratio (i) of the gear reducer using the following formula: i=n1/n2 2. The torque required by the application (Mr2). The geared motor or gear reducer can be selected once this data is
known.This guide helps you to select the right product in just a few steps: Geared motor selection 1. Determine the application’s actual service factor (s.f.). This parameter depends on the type of load of the powered machine, the number of starts per hour and the hours of operation (refer to the "Service factor" paragraph).
2. Calculate the input power Pr1 using the required torque value Mr2, the speed n2 and dynamic efficiency value.
Pr1=(Mr2*n2)/(9550*ηd). The dynamic efficiency value depends on the type of gear reducer and on the number of
gear reduction stages. (To calculate the efficiency value see its page).
3. Consult the geared motor performance tables and identify a normalised power value Pn1 exceeding the required power Pr1, such that: Pn1≥Pr1 4. Once the suitable nominal power has been identified, select the geared motor capable of generating the rotational speed closest to the desired n2 value and with service factor s.f. greater or equal to that required by the application.
Characteristics Die-cast aluminium alloy cases for gears (sizes 025-110) Die-cast materials undergo the following surface cleaning operations: De-burring by means of a mechanically operated shearing system. Accurate shot-peening. Painting. Washing and passivation.
Grey-coloured cast-iron cases for gears (sizes 130-150) Die-cast materials are always painted.
Mechanical properties Tests carried out onto degreased Unichim white lattens (film thickness: 60 microns) comply with the following specifications: adherence (ISO2409).
Heat resistance 24 HOURS AT 150°C.
Corrosion strength ASTM B 117/97 salt fog from 100 to 500 hours depending on the support’s preliminary treatment.
Performance Loading capacity in accordance with: ISO 14521, DIN 3996, BS 721, AGMA 6034, ISO 6336, DIN 3990, DIN 743, ISO 281.
Q1: Are you a trading company or a manufacturer ? A2: We are a manufacturer in Jiangsu Province, China. Our company owns the ability of manufacturing, processing, designing and R&D. We welcome your visit.
Q2: How we select models and specifications? A2: According to the specific details of the demands from the part of enquiry, we will recommend the products’ models upon synthesizing the factors of field of products usage, power, torque arm and ratio…
Q3: How is your price? Can you offer any discount? A3: Our prices are always competitive. If the customer can place a large order, we surely will allow discount.
Q4: How long should I wait for the feedback after I send the enquiry? A4: We will reply as soon as possible, 12 hours at most.
Q5: What is your product warranty period? A5: We have the certifications of ISO9001,CE, SGS.
Q6: What industries are your gearboxes being used? A6: Our gearboxes are widely applied to metallurgical equipment, mining equipment, automation equipment, food machinery, packaging equipment, tobacco equipment and so on.