Brochure

Note 1) This is the momentary speed at which an object is impacting against a shock absorber. The collision speed is υ = 2υ when the speed (average
speed υ) is calculated from the air cylinder’s stroke time.
Note 2) This is the theoretical mass, which is converted into the mass of the impacting material under no thrust collision conditions. Hence, E = —·Me·υ
2
Shock Absorber
Series RJ
Model Selection 2
Select the RJ1007L.
Type of impact
1
Symbol
m
υ
h
ω
r
F
T
n
t
μ
Operating conditions
Impact mass
Collision speed
Dropping height
Angular speed
Distance between rotational center and impact point
Thrust
Torque
Operating frequency
Ambient temperature
Friction coefficient
Type of impact
Collision speed υ
1
YES
E1 ≈ 0.63 J

Thrust energy E2
Select the RJ1007L temporarily and obtain
E
2 by using the formula.
E2 ≈ 1.05 J
Use Formula “Absorbed energy E = E 1 + E 2 =
0.63 + 1.05 = 1.68 J” to calculate Me by using
E and 0.5 for υ.

Equivalent mass Me
YES
Me ≈ 13.4 kg
Caution on Selection
Model Selection Step Example of Selection
Model Selection
Impact of thrust of load (Horizontal)
Impact of thrust of load (Downward)
Impact of thrust of load (Upward)
Free horizontal impact (Impact of inertial force)
Free fall impact
Swing impact (With torque)
Operating conditions
2
Unit
kg
m/s
m
rad/s
m
N
N·m
cycle/min
°C
—
Confirmation of specifications and precautions
3
Ensure the collision speed, thrust, operating frequency, ambient
temperature and atmosphere fall within the specifications.
∗ Be aware of the minimum installation radius in the case of
swing impacts.
4 Calculation of kinetic energy E1
Calculate kinetic energy E1 by using the formula according to
the impact type.
5 Calculation of thrust energy E2
Calculate thrust energy E2 by selecting a model temporarily.
6 Calculation of equivalent mass Me
Calculate absorbed energy E to confirm it is not more than the
maximum absorbed energy of the temporarily selected shock absorber.
Equivalent mass Me = — · E
2
υ
2
7 Selection of applicable model
Substitute the obtained equivalent mass Me, and the collision
speed υ by using “Model Selection Graph” !9 to @4 to check if
the temporarily selected model is compatible with the
condi-tion of application. If satisfactory, then the temporarily
select-ed model will be the applicable one.
Kinetic energy
Thrust energy
Absorbed energy
E1
E2
E
Me
Equivalent mass
Operating
conditions
2
Confirmation of
specifications
and precautions
3
Calculation of
kinetic energy E
1
4
Calculation of
thrust energy E
2
5
Calculation of
equivalent mass
Me
6
Check adequacy
of the selected
model RJ1007.
7
Impact of thrust of load (Horizontal)
(Impact of thrust from sources
other than air cylinder actuation)
υ
— · m
·
υ
2
1
2
— · E
2
υ
2
F · S
E1 + E2
= 5 kg
= 0.5 m/s
= 150 N
= 30 cycle/min
= 25°C
m
υ
F
n
t

Confirmation of specifications
υ
··· 0.5 < 1.0 (max.), 2.0 (max.)
t ··· –10 (min.) < 25 < 60 (max.)
F ··· 150 < 422 (max.)

Kinetic energy E1
Use Formula to calculate E1 by using 5.0 for
m and 0.5 for υ.

Selection of applicable model
According to Graph @1, the temporarily selec-
ted RJ1007L satisfies Me = 13.4 kg < 14.5
kg, resulting in an operating frequency of n =
30 < 70, without causing a problem.
Load
Shock absorber
Note 1)
Note 2)
3