4.1.1 symbols and units of measurement Symbols and units of measure

P: power Power (KW)

P1: input power Input power

P2: output power of Output power

P1 n: Select motor power selection of motor power

Dynamic efficiency η d: Dynamic efficient

η D is worm gear box after a long enough time to run and, surface temperature decrease and eventually stabilized calculated the relationship between P2 and P

Static efficiency η s

η D is the efficiency of worm gear box starting stage, in the selection of intermittent working system, are very important factors to consider

F s: Service factor coefficient

Using the coefficient used to represent the load characteristic of speed reducer, it takes into account the relevant and reducer applications every operating conditions, the change of the load, overload and other factors. In the following icon, in the selection of appropriate "every time" column, the hourly start times and curve of K1, K2 or K3 intersection points obtained using coefficient. The K curves are obtained by K (inertial acceleration and load characteristics can be divided into: uniform load, medium load and heavy load) associated with the driven device, and the moment of inertia and the inertia of motor related wallpaper.

Influence of environment temperature, using the adjustment coefficient:

A. ambient temperature 30-40 ℃: FS * (1.1-1.2)

B. ambient temperature 40-50 ℃: FS * (1.3-1.4)

C. ambient temperature 50-60 ℃: FS * (1.5-1.6)

Service factor should be adjusted as followings:

A, ambient temperature, is30-40 ℃, FS * (1.1-1.2)

B, ambient temperature, is40-50 ℃, FS * (1.3-1.4)

C, ambient temperature, is50-60 ℃, FS * (1.5-1.6)

N 1: reducer input speed (r/min) Gear unit input speed (r/min)

The N output 2: reducer speed (r/min) Gear unit output speed (r/min)

I: ratio Ratio

N 1

I= -

N 2

Fr1: input shaft radial load

The Fr2: output shaft radial load

M2: output torque (Nm)

M2n: selects the output torque

9550 · P1 · D

M2= ----------------------------

N 2

M2 n ≥ M2 · f s:

The selection of 4.1.2 Understanding the following when factor: select the gearbox

● load condition of Load condition

● use speed or speed ratio (UDL in combination with bipolar combination, etc.) Speed scope or ratio in application

● operating condition and environment (temperature, humidity, corrosion) Working condition and environment

● installation space Installation space

For example, Examples for model chosen 4.1.3 selection

The equipment is driven by torque is 150 N.m, the input speed is 1400 r/min, the output speed is 70 r/min, the medium load, running 8 hours a day,

Restart 20 times per hour, ambient temperature of 30 ℃. Motor B3 installation position

(1) to determine the ratio of I=n1/n2=1400/70=20.

(2). To determine the coefficient, medium load, select K2 curve, take 20 times the frequency of intersection, check 8 hours / day f s =1.25

(3). The temperature of 36 ℃, 1.1 is the coefficient of temperature, the f s =1.25 * 1.1=1.38

(4). The torque M2 n ≥ M2 · f s= 150 * 1.43=214.5 Nm

(5). Check the performance table, meet 3 conditions, the ratio is 20, the M2 N equal to or greater than 214.5Nm, the f s must be equal to or greater than 1.38, check the closest NMRV 90-20-B3-2.2-4

Input power driven equipment is 1.5 KW input speed is 900 r/min, the output speed is 60 r/min, heavy shock loads, each running 16 hours a day, 100 times per hour, ambient temperature of 20 ℃.

(1) determine the ratio I=n1/n2=900/60=15

(2) the heavy load to determine the coefficient,, select K3 curve, find the intersection point of 16 hours and 100 times, check f s =1.9

(3) the temperature of 20 ℃, 1 is the temperature coefficient, the modified f s =1.9 * 1= 1.9

(4) determine the selection of motor P 1n ≥ P1 · f s =1.5 * 1.9= 2.85 kw

(5) check the performance table, meet 3 conditions, I=15, f s must be equal to or greater than 1.9, the P 1n must be equal to or greater than 2.85kw, check the closest NMRV 110-15-132S6

Copyright：Hangzhou Oubang Machinery Co., Ltd. Phone： 0571-57579319 Location：xinwan Industrial Park of Xiaoshan District of Hangzhou City, Zhejiang province China