![background image](http://html1.mh-extra.com/html/smc-networks/chsd-series/chsd-series_manual_1299524027.webp)
Cylinder Cushion Selection
Selection Procedures
Series
CHS
Model Selection 1
Calculation Example
<Design conditions>
Cylinder:
CHSD50
Set pressure:
P1: 7 MPa
Load weight:
M: 400 kg
Piston speed:
V: 0.2 m/s
(at the cushion seal contact point)
Load transfer direction:
Downward
θ
: 30
°
(External force applied to the
cylinder is gravity only)
Operating direction:
Extended
Gravitational
acceleration
:
g: 9.8 m/s
2
<Calculation>
1. Load inertial energy E
1
at the cushion seal contact point
E
1
= MV
2
/2 = 400
0.2
2
/2 = 8J
2. External force F applied in axial direction of the cylinder
at the cushion seal contact point
F = Mgsin
θ
= 400
9.8
sin30
°
= 1960N
3. Convert the external force calculated in step 2
into energy E
2
.
External force: Draw a vertical line from the
value of 1960N, the point where this line
intersects with the diagonal line 5.2J is energy
caused by external force.
E
2
= 5.2J
4. Find the maximum absorbed energy E for a
cylinder.
Maximum absorberd energy: Draw a vertical line
from the set pressure 7MPa, the point where this
line intersects with the line for Ø 50 (21J) is the
maximum absorbed energy.
E = 21J
5. Confirm that E
1
+ E
2
E.
E
1
+ E
2
= 8 + 5.2 = 13.2J
E = 21J
E
1
+ E
2
E
Therefore, the cylinder cushion is available for
use.
Find the inertial energy
E
1
for the load at the
cushion seal contact point.
Install a shock absorber.
Find the external force F applied
in the axial direction of the cylinder
at the cushion seal contact point.
Convert the external force
calculated in step 2 above into
energy E
2
using the external force
energy conversion chart.
From the maximum absorbed
energy-pressure chart, find the
maximum absorbed energy E for
the corresponding cylinder.
Availabe for use
YES
YES
YES
YES
NO
NO
NO
NO
Caution
Use a cylinder cushion within the maximum absorbed energy range.
When used outside the allowable range, it may cause damage to cylinders and
peripheral devices.
30
°
Mg
Mgsin
θ
θ
Confirm
E
1
+ E
2
E.
Lower the
set pressure.
Reduce
inertial load.
Use larger
cylinder bore
size.
26