Page 53 - 1_usa.qxp

SEO Version

52
Definitions and abbreviations
a
b
(m/s
2
) Acceleration
a
v
(m/s
2
) Deceleration
B (mm)
Pulley width
b
(cm)
Belt width
t
(mm)
Belt pitch
C (N/mm) Belt modulus / spring rate
C
spez
(N)
Specific spring rate
A (mm)
Centre distance
A
eff
(mm)
Effective centre distance
d
(mm)
Bore diameter
d
a
(mm)
Outside pulley diameter
d
w
(mm)
Pitch circle diameter
d
U
(mm)
Idler pulley diameter
F
wdyn
(N)
Dynamic shaft load
F
wsta
(N)
Static shaft load
F
Tmax
(N)
Maximum span force
F
R
(N)
Resisting force of friction
F
Uspez
(N/cm) Specific tooth shear strength
F
Tv
(N)
Pretension force per belt side
F
Tzul
(N)
Allowable tensile load
F
U
(N)
Peripheral force
F
H
(N)
Vertical lifting force
F
ab
(N)
Acceleration force
F
av
(N)
Deceleration force
g
(m/s
2
) Acceleration due to gravity (= 9,81 m/s
2
)
Δ
l
(mm)
Elongation
Δ
s
(mm)
Difference of position due to force
L
1
,L
2
(mm)
Length of tight and slack side
L
R
(mm)
Belt length
M (Nm)
Torque
M
ab
(Nm)
Torque during acceleration
M
av
(Nm)
Braking torque
ρ
(kg/dm
3
) Specific weight
m (kg)
Total mass
m
R
(kg)
Mass of belt
m
c
(kg)
Mass of carriage / slide
m
S
(kg)
Pulley mass
m
Sred
(kg)
Pulley reduced mass
m
U
(kg)
Idler mass
m
Ured
(kg)
Idler reduced mass
n
(min
-1
) Rpm
n
1
(min
-1
) Rpm driver pulley
Δ
n (min
-1
) Rpm variation
c
1
-
Service factor
P (kW)
Power
s
ges
(mm)
Total travel
s
ab
(mm)
Travel during acceleration
s
av
(mm)
Travel during deceleration / braking
s
c
(mm)
Travel at constant speed
t
ges
(sec
-1
) Total time of travel
t
ab
(sec
-1
) Acceleration time
t
av
(sec
-1
) Deceleration time / braking time
t
c
(sec
-1
) Time at constant speed
v
(m/s)
Peripheral speed
z
-
No. of teeth of pulley
z
k
-
No. of teeth of small pulley
z
g
-
No. of teeth of big pulley
z
R
-
No. of teeth of belt
z
e
-
No. of teeth in mesh
i
-
Drive ratio
ω
(s
-1
)
Angular velocity
μ
-
Coefficient of friction