RB0805 Datasheet, PDF (2/14 Pages) List of Unclassifed Manufacturers – Absorbing impact and noise

Shock Absorber
Series RB
Technical Data:
Model Selection
Model Selection Step
1. Type of impact
Cylinder stroke at load (Horizontal)
Cylinder stroke at load (Downward)
Cylinder stroke at load (Upward)
Conveyor stroke at load (Horizontal)
Free horizontal impact
Free dropping impact
Rotating impact (With torque)
2. Enumeration of operating conditions
Symbol Operating condition Unit
m Impacting object mass kg
υ
Collision speed
m / sec
h
Dropping height
m
ω
Angle speed
rad/sec
R
Distance between axis of
cylinder and impact point
m
d
Bore size
mm
p Cylinder operating pressure _MPa
F
Thrust
N
T
Torque
N·m
n
Operation cycle cycle / min
t Ambient temperature °C
μ
Friction coefficient
—
3. Specifications and operational instructions
Ensure that the collision speed, thrust,
operation cycle, the ambient temperature
and atmosphere fall within the specifications.
∗ Be aware of the min. installation radius in
the case of rotating impacts.
4. Calculation of kinetic energy E1
Using the equation suitable for the classifica-
tion of impact.
In the case of cylinder stroke at load and free horizontal impact,
substitute respective figures for Data A in order to calculate E1.
5. Calculation of thrust energy E2
Select any shock absorber as a provisional
model.
In the case of thrust energy of cylinder E1,
substitute respective figures for Data B or Data C .
6. Calculation of corresponding mass of impacting object Me
Absorbed energy E = E1 + E2
Corresponding mass of impacting object Me = —_ϲ₂·E
Substitute both absorbed energy E and collision
speed υ for Data A in order to calculate the cor-
responding mass of the impacting object Me.
7. Selection of applicable model
Taking into consideration the corresponding
mass of the impacting object Me, calculated
using Data D and collision speed υ, check
provisional model compatibility with the
condition of application. If this is satisfactory,
then the said provisional model will be the
applicable one.
Caution on Selection
In order for the shock absorbers to operate
accurately for long hours, it is necessary to
select a model that is well-suited to your
operating conditions. If the impact energy is
smaller than 5% of the maximum energy
absorption, select a model that is one class
smaller.
1674
Selection Example
1.
Type
of impact
Cylinder stroke at load (Horizontal)
Shock absorber
Cylinder
Load
Collision speed ⁽¹⁾
υ
Kinetic energy
E1
Thrust energy
E2
Absorbed energy
E
Corresponding ⁽²⁾
mass of
impacting object
Me
2.
Operating
conditions
m = 1 kg
υ = 0.5 m/s
d = 10 mm
p = 0.5 MPa
n = 30 cycle/min
t = 25 °C
υ
—₂₁ ·m·υ²
F1·S
E1 + E2
— _ϲ₂ ·E
2.
Operating
conditions
m = 50 kg
υ = 0.3 m/s
d = 40 mm
p = 0.5 MPa
n = 20 cycle/min
t = 25 °C
3.
b Confirmation of specifications
υ ··· 0.5 < 1.0 (max.)
Specifications t ··· –10 (min.) < 25 < 80 (max.)
and operational ^{F ··· F1 ··· 39.3 <}
instructions
YES
3.
b Confirmation of specifications
υ ··· 0.3 < 5 (max.)
Specifications t ··· –10 (min.) < 25 < 80 (max.)
and operational ^{F ··· F1 ···628 < 1961 (max.)}
instructions
YES
4.
b Kinetic energy E1
Calculation
Use Formula to calculate E1.
Substitute 1.0 for m and 0.5 for υ.
of kinetic
energy E1
E1 ≅ 0.125
4.
b Kinetic energy E1
Calculation
Use Formula to calculate E1.
Substitute 50 for m and 0.3 for υ.
of kinetic
energy E1
E1 ≅ 2.3 J
5.
Calculation
of thrust
energy E2
b Thrust energy E2
Provisionally select a model
RB0604 and make the use of
Data B at left. According to d =
10, E2 is obtained.
E2 ≅ 0.157
5.
b Thrust energy E2
Calculation
Provisionally select a model
RB2015 and make the use of
of thrust
energy E2
Data B . According to d = 40, E2
is obtained.
E2 ≅ 9.4 J
6.
b Corresponding mass
Calculation of ^{of impacting object Me}
corresponding
Use the Formula “Absorbed
energy E = E1 + E2 = 0.282” to
mass of
calculate Me. Substitute 0.282 for
impacting
E and 0.5 for υ.
object Me
Me ≅ 2.3
6.
b Corresponding mass
Calculation of ^{of impacting object Me}
Use the formula “Absorbed energy
corresponding _{E = E1 + E2 = 2.3 + 9.4 = 11.7 J”}
mass of
to calculate Me. Substitute 11.7 J
impacting
for E and 0.3 for υ.
object Me
Me ≅ 260 kg
7.
Selection
of RB0604
b Selection of RB0604
RB0604 satisfies Me = 2.3 < 3 kg
(Max. corresponding mass of im-
pacting object). Ultimately, it will
result in an operating frequency
of 30 < 80, without causing a
problem.
YES
b Selection of applicable
model
According to Data D , the tentative-
7.
ly selected RB2015 satisfies Me
Selection of
= 260 kg < 400 kg at υ = 0.3. Ulti-
mately, it will result in an operat-
applicable ing frequency of n···20 < 25, with-
model
out causing a problem.
YES
Select RB2015