Cushion Capacity
2000
1500
1000
500
400
300
200
100
3
5
10
20 30
MY2C40
50
100
200
2000
1500
1000
500
400
300
200
100
1
2
3 4 5
10
20 30 4050
MY2C25
m
2
max.
m
1
max.
m
3
max.
m
3
max.
m
2
max.
m
1
max.
m
3
max.
MY2C16
100
200
300
400
500
1000
1500
2000
0.5
1
2
3 4 5
10
20 30
m
1
, m
2
max.
60
m
1
max.
m
1
max.
2000
1500
1000
500
400
300
200
100
0.5
1
2
3 4 5
Load mass
kg
MY2H16
Horizontal impact: P = 0.5 MPa
2000
1500
1000
500
400
300
200
100
1
2
3 4 5
10
20
50
40
Load mass
kg
MY2H25
Horizontal impact: P = 0.5 MPa
10
30
20
Cushion Selection
Absorption Capacity of Air Cushion and Stroke Adjusting Units
<Air cushion>
Air cushions are a standard feature on mechani-
cally jointed rodless cylinders.
The air cushion mechanism is installed to avoid
excessive impact of the piston at the stroke end
during high speed operation. The air cushion
does not act to decelerate the piston near the
stroke end.
The ranges of load and speed that air cushions
can absorb are within the air cushion limit lines
shown in the graphs.
<Stroke adjusting unit with shock absorber>
Use this unit when operating with a load or speed
exceeding the air cushion limit line, or when
cushioning is necessary because the cylinder
stroke is outside of the effective air cushion
stroke range due to stroke adjustment.
L unit
Use this unit when cushioning is necessary out-
side of the effective air cushion range even if the
load and speed are within the air cushion limit
line, or when the cylinder is operated in a load
and speed range above the air cushion limit line
and below the L unit limit line.
H unit
Use this unit when the cylinder is operated in a
load and speed range above the L unit limit line
and below the H unit limit line.
Air Cushion Stroke
(mm)
Bore size (mm)
16
25
40
Cushion stroke
12
15
24
m
2
, m
3
max.
30
m
2
, m
3
max.
Impact speed
mm/s
Load mass
kg
Horizontal impact: P = 0.5 MPa
Impact speed
mm/s
2000
1500
1000
500
400
300
200
100
3
5
10
20 30
Load mass
kg
MY2H40
Horizontal impact: P = 0.5 MPa
50
100
200
m
1
, m
2
, m
3
max.
Impact speed
mm/s
Load mass
kg
Horizontal impact: P = 0.5 MPa
Impact speed
mm/s
Impact speed
mm/s
Load mass
kg
Horizontal impact: P = 0.5 MPa
Impact speed
mm/s
Air cushion
Air cushion
L unit
L unit
H unit
Air cushion
Air cushion
L unit
L unit
H unit
H unit
Air cushion
Air cushion
L unit
H unit
L unit
H unit
Caution
Calculation of Absorbed Energy for Stroke
Adjusting Unit with Shock Absorber
(N
⋅
m)
Horizontal
Vertical
(downward)
Vertical
(upward)
Type of
impact
Kinetic energy
E
1
Thrust energy
E
2
Absorbed energy
E
m
⋅
υ
2
F
⋅
s
F
⋅
s
+
m
⋅
g
⋅
s F
⋅
s
m
⋅
g
⋅
s
E
1
+
E
2
Symbols
υ
:
Speed of impacting object (m/s)
m:
Mass of impacting object (kg)
F:
Cylinder thrust (N)
g:
Gravitational acceleration (9.8 m/s
2
)
s:
Shock absorber stroke (m)
Stroke Adjusting Unit Holding
Bolt Tightening Torque
(N
⋅
m)
Bore size (mm)
16
25
40
Tightening torque
0.7
1.8
5.8
υ
m
s
s
υ
m
s
υ
m
Do not use a shock absorber and air cushion to-
gether.
Note) The speed of the impacting object is measured at
the time of impact with the shock absorber.
1
2
1094
Series
MY2
P1057-P1120-E.qxd 08.10.3 2:27 PM Page 1094
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com