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Shock Absorbers / Economy

Shock Absorbers / Economy

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MISUMI

MISUMI

[Features] Operating temperature range: -10 to 50°C. Durability: 500,000 times.

Data sheet

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EMACN
[ ! ] Operating Temp. Range: －10 to 50°C
Durability: 500,000 times
Collision Velocity Range: No. 1212 A/B/C: 0.3 to 1.0 m/s
No. 1212D: 0.1 to 0.7 m/s
No. 1212E: 0.1 to 0.5 m/s
Max. Tightening Torque: 1.5 N⋅m
(When shouldering to ø14.6, tighten up at 1.0 N/m.)
Part[M] Material[S] Surface Treatment
Main BodyPPS—
CapPOM
Piston RodEN CW614N Equiv.Electroless Nickel Plating
[A]Accessory: Nut [Diagonal: 19.6; Width Across: 17]

Specification Table

Part Number
EMACN1212A
Part NumberCap
Color		Thread Dia.
MXP		Stroke
S		Max. Absorbed Energy (E')Max. Equivalent
Mass (me')
(kg)		Piston Rod
Return Force
(N)		Max.
Drag Value
(N)
TypeNo.Per cycle
(J)		Per minute
(J)
EMACN1212 AWhiteM12 × 1120.2914.71.52.45245
1212BBlack0.493.0294
1212CYellow1.05.05.0
1212DGreen7.5
1212ERed10.0
* Each item in the specification table represents the following.
  • [Maximum Drag Value]The maximum value of the hydraulic resistance force that occurs during energy absorption (during stroke).
  • [Maximum Absorbed Energy]The maximum amount of energy that the absorber can receive at one time. (More than this will lead to damage)
  • [Equivalent Mass]The mass when the total energy to be absorbed by the absorber is equivalent to the kinetic energy in horizontal motion.
    It is "a value that converts selected factors such as thrust, the amount of collision material, and velocity into mass."
  • [Piston Return Force]This is the spring force that causes the piston to return from its pushed position.

Selection Supporting Information

■Oil shock absorber is a shock absorber that
primarily uses oil. Compared with other cushioning materials (rubber, spring, air, etc.), they are compact and capable of repeatedly absorbing large impact energy
softly without rebound. Internal structure and basic principle of oil type shock absorbers are shown as follows.
When an object collides with a piston rod, the oil in the pressure chamber is compressed by a piston.
　The clearance between inner tube and piston is so small that compressed oil is forced out of the orifices.
　At this point, the impact energy is converted into heat energy by dynamic resistance.

The piston rod sinks into the shock absorber body so that the oil equal in volume to the piston
moves into the accumulator.
  This mechanism provides an ideal shock absorbing action.
Various absorption characteristics can be obtained depending on the number and size of orifices.
(Refer to classification according to absorption characteristics structures.)
Please note that when the wrong collision speed is selected, some abnormal reaction may occur during collision or the impact energy may not be absorbed in an ideal manner.
　　
■Procedure of Selection
(1) Calculation of inertial energy (E1 ) 
According to examples of calculation for selection, calculate inertial energy based on collision mass (m), collision velocity (V)
·moment of inertia (I) and collision angular velocity (ω).

 

(2) Calculation of additional energy (E2') 
Confirm whether there is propulsion (F) or not and calculate the
additional energy according to Examples Of Calculation For Selection.

 

(3) Temporary decision of absorber stroke 
Obtain the temporary stroke (S') based on Fig. 1.

 

(4) Calculation of total energy 
Calculate the total energy from the sum of inertial energy (E1) and additional energy (E2 ').

 

(5) Select absorption characteristics structures from energy ratio 
Select an orifice type from Fig. 2 temporarily.

 

(6) Check max. absorbed energy per minute 
Calculate the energy (ET) per minute from the operating cycle (cycle/min) and total energy, and confirm whether or not the value is within the possible operating range.

 

(7) Check equivalent mass 
According to examples of calculation for selection, calculate the equivalent mass and confirm whether it is less than the max. equivalent mass in the catalog (me').
　

 

 

Calculate the temporary stroke S' with the Inertial Energy E1 (Adjustable / Fixed Force Type)

 

Fig. 2 Select the orifice type from energy ratio (additional energy E2' / inertial energy E1)
Examples of Calculation for Selection
Selection examples: Pure inertia collision (Horizontal collision without thrust)
Selection examples: Horizontal collision with air cylinder thrust force
Selection examples: Non-thrust stop when cylinder descends
App. Example
and
Collision Conditions

[Collision Conditions]
m = 25 kg
V = 0.6 m/s
F=ON
N = 30 times/min


Air Cylinder
Inner diameter ø40 Operating pressure 0.5 MPa

[Collision Conditions]
m = 30 kg
V = 0.6 m/s
N = 20 times/min

[Collision Conditions]
m = 15 kg
V = 0.2 m/s
N = 10 times/min

Air Cylinder
Inner diameter ø25 Operating pressure 0.5 MPa

Collision Velocity V
[m/s]
V = 0.6 m/sV = 0.6 m/s

V = 0.2 m/s

* Collision velocity V is actual measurements
or 1.5 to 2 times the average speed

Absorbed Energy

Moment of Inertia
Energy
E1

[J]
E1 = m × V22 = 25 × 0.622 = 4.5 JE1 = m × V2 2 = 30 × 0.62 2 = 5.4 JE1 = m × V2 2 = 15 × 0.22 2 = 0.3 J
Temporary stroke S'
[mm]
From Figure 1, S' = 20 mm (Select adjustable type)From Figure 1, S' = 15 mm (Select adjustable type)From Figure 1, S' = 10 mm (Select adjustable type)
Additional
Energy
E2
[J]
E2’ = 0JThrust of the cylinder is F = 628.4N
E2' = F × S' = 628.4 × 0.015 = 14.8 J		Cylinder thrust is F = 245.4 N
E2' = (F + mg) × S' = (245.4 + 15 × 9.8) × 0.01 = 3.92 J
Total energy E'
[J]
E’ = E1+E2’ = 4.5+0 = 4.5JE’ = E1+E2’ = 5.4+9.4 = 14.8JE’ = E1+E2’ = 0.3+3.92 = 4.22J
Equivalent Mass
me'
[kg]
me' = 2 × E' V2 = 2 × 4.5 0.62 = 25 kgme' = 2 × E' V2 = 2 × 14.8 0.62 = 82.2 kgme' = 2 × E' V2 = 2 × 4.22 0.22 = 211 kg
Tentative selection
Select Adjustable Type
Select L from the collision velocity.
Select MAC1612 from E and me'

(stroke
S = 12 mm)
Select Adjustable Type
Select medium speed M from the collision velocity.
Select MAC2016M from E and me'

(stroke
S = 16 mm)
Select Adjustable Type
Select ultra low speed S from Fig. 2.
Select MAC1612S from E and me'

(stroke
S = 12 mm)
Recalculation
E2 = 0J
E = E1+E2 = 4.5J		me = 2 × E V2 = 25 kgE2+F × S=10.1J
E = E1+E2 = 15.5J		me = 2 × E V2 = 86.1 kgE2 + (F + mg) × S = 4.71 J
E = E1+E2 = 0.3+4.71=5.01J		me = 2 × E V2 = 250 kg
Energy per minute ET
ET = E × N = 4.5 × 30 = 135 J/minET = E × N = 15.5 × 20 = 310 J/minET = E × N = 5.01 × 10 = 50.1 J/min
Confirmation
E, me, N, and ET are all OK
Select MAC1612L		E, me, N, and ET are all OK
Select MAC2016M		E, me, N, and ET are all OK
Select MAC1612S
* For pure-inertial collision without thrust force, select the orifice type by only collision velocity.
Examples of Calculation for Selection
Selection examples: Horizontal collision with belt conveyor thrust force
Selection examples: Collision with synchronous motor driven load
Selection examples: Horizontal rotation collision with torque
App. Example
and
Collision Conditions


Dynamic Friction Coefficient µ = 0.4

[Collision Conditions]
m = 5 kg
V = 0.5m/s
N = 20 times/min


Motor output P = 20 w,
Number of poles M = 36
Power Supply Frequency f = 50 Hz　
Reduction ratio K = 20

[Collision Conditions]
m = 1 kg
R=0.4 m
r = 0.3 m
θ=20°
N = 10 times/min
l = 43mr2
3 mr2 = 0.12 kg·m2
ω = 5.6 rad/s
F=59.3 N

[Collision Conditions]
I = 125.5 kg·m2
ω = 1.8 rad/s
R=1.25 m
N = 6 times/min
T=68.6 N⋅m

Collision Velocity V
[m/s]
V = 0.5m/sV = Rω = 0.40 × 5.6 = 2.24 m/sV = Rω = 1.25 × 1.8 = 2.25 m/s
Absorbed Energy
Moment of Inertia
Energy
E1
[J]
E1 = m × V22 = 5 × 0.522 = 0.625 JE1=Iω22=0.12 × 5.622=1.88JE1=Iω22=125.5 × 1.822=203.31J
Temporary stroke S'
[mm]
From Figure 1, S' = 5 mm (Select adjustable type)From Figure 1, S' = 10 mm (Select adjustable type)From Figure 1, S' = 50 mm (Select adjustable type)
Additional
Energy
E2
[J]
F = µmg = 0.4 × 5 × 9.8 = 19.6 N
E2’ = F·S’ = 19.6 × 0.005 = 0.098J		E2' = (F + mg) × S' = (59.3 + 1 × 9.8) × 0.01 = 0.69 JE2’=TR·S’=68.61.25 × 0.05=2.74J
Total energy E'
[J]
E’ = E1+E2’ = 0.625+0.098 = 0.723JE’ = E1+E2’ = 1.88+0.69 = 2.57JE’ = E1+E2’ = 203.31+2.74 = 206.05J
Equivalent Mass
me'
[kg]
me' = 2 × E'V2 = 2 × 0.723 0.52 = 5.8 kgme'= 2 × E'V2 = 2 × 2.57 2.242 = 1.0 kgme'= 2 × E'V2 = 2 × 206.05 2.252 = 81.4 kg
Tentative selection
Select Fixed Force Type
Select Single Orifice from V
Select MAKC1005 B from E' and me'

(stroke
S = 5 mm)
Select Adjustable Type
Select Multi-Orifice from Fig. 2.
Select MAC1210H from E' and me'

(stroke
S = 10 mm)
Select Adjustable Type
Select Speed H Type from Fig. 2.
Select MAC3650H from E' and me'

(stroke
S = 50 mm)
Recalculation
E2 = E2’ = 0.098J
E = E1+E2 = 0.723J		me = 2 × EV2 = 5.8 kgE2 = 0.69J
E = E1+E2 = 2.57J		me = 1.0 kgE2=TR·S=2.74J
E=E1+E2=206.05J		me = 2 × E V2 = 81.4 kg
Energy per minute ET
ET = E × N = 0.723 × 20 = 14.46 J/minET = E × N = 2.57 × 10 = 25.7 J/minET = E × N = 206.05 × 6 = 1,236.3 J/min
Confirmation
E, me, N, and ET are all OK
Select MAKC1005 B		E, me, N, and ET are all OK
Select MAC1210H		E, me, N, and ET are all OK
Select MAC3650H
■Shock Absorbers Classification according to absorption characteristics structures
Structure
Adjustable
Fixed Force Type
 
Single
Orifice
S Type
A Type
B Type
L Type
　There are three types of single orifices; a dashpot structure using a clearance between the piston and cylinder tube, a single-tube structure with an orifice in the piston, and a double-tube type tapered orifice, all of which exhibit similar drag force characteristics.
　
　
　The piston slides in a cylinder tube filled with oil, and a tapered orifice is installed in this piston.
Because the orifice area is constant over the entire stroke, as the shock absorption characteristics shown in the right graph, the resistance is the largest immediately after a collision but gradually reduces speed as the stroke continues.
　
　
Irregular Multi
Orifice
Medium Speed
Type M
　In this double-tube structure, the piston slides the
inner wall of the inner tube. This inner tube has several orifices along the
direction of strokes, and not constant damping, but
absorbs energy depending on various purposes. It is designed to absorb kinetic energy during the first half of stroke and
control speed during the second half. Therefore, it is well suited to
absorb energy against air cylinder thrust.
Multi
Orifice
High Speed
Type H
　In this double-tube structure, the piston slides in the
inner tube. This inner tube has several orifices along the direction
of strokes. Because the orifice area
becomes small gradually as the stroke speed slows down, the drag force fractures but the maximum drag is
lower.
 [ ! ] * Adjustable Type No. 0806M is single orifice structure and No. 3625 L Type is multi-orifice structure.
* When using shock absorbers (fixed force type) in parallel, calculate the total energy as shown below.
　　E = E'/n
　　E: Energy acting on each shock absorber
　　E’: Total Energy
　　n: Number of shock absorber receivers
* Do not use adjustable type shock absorbers in parallel.

Cautions on Use

■ Precautions for Use
  • Shock absorbers use oil internally, and seals are used to prevent oil from leaking to the outside, but a perfect seal cannot be guaranteed.
    Because of this, it cannot be used in environments that prohibit oil.
  • Check for oil leaks and the return status of the piston rod. If leaking of a large amount of oil or failure of returning piston rod are found, there
    may be some abnormality and it should be replaced. If you use a defective product, it may cause damage to the unit to which it is installed.
  • With the number of uses, the energy absorption capacity will decrease due to the reduction in internal oil and wear of parts. Taking this into account, we recommend selecting a size that has at least 20 to 40% margin for the maximum absorbed energy.
  • The performance and functionality of shock absorbers may deteriorate depending on the load. Perform daily inspections to ensure that the required functions are met and to prevent accidents from occurring.

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Part Number
EMACN1212A
EMACN1212B
EMACN1212C
EMACN1212D
EMACN1212E
Part Number
Standard Unit Price
Minimum order quantityVolume Discount
Standard
Shipping Days
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RoHSMax. Absorbed Energy
(J) 		Max. Collision Velocity
(m/s) 		Min. Collision Velocity
(m/s) 		Equivalent Mass
(kgf) 		Max. Resisting Force Value
(N) 		Max. Absorbed Energy (per Minute)
(J/min) 		Cap Color

11.97 €

1 Available Same day

Stock

100.2910.31.524514.7A (White)

11.97 €

1 Available 5 Days 100.4910.3329414.7B (Black)

13.85 €

1 Available 5 Days 10110.352945.0C (Yellow)

13.85 €

1 Available 5 Days 1010.70.17.52945.0D (Green)

13.85 €

1 Available 5 Days 1010.50.1102945.0E (Red)

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Basic information

Main Body, Related Components Main Body Structure Economy Type Stroke(mm) 12
Mounting Screw Nominal (M) M12 Usage Environment Standard Main Body Material PPS
Overall Length(mm) 70 Piston Rod Return Force(N) 2.45 Operating Temperature Range(°C) -10::50
Thread Size M M12X1.0

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Basic Attributes

  • Max. Absorbed Energy(J)

    • 0.29
    • 0.49
    • 1

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  • Max. Collision Velocity(m/s)

    • 0.5
    • 0.7
    • 1

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  • Min. Collision Velocity(m/s)

    • 0.1
    • 0.3

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  • Equivalent Mass(kgf)

    • 1.5
    • 3
    • 5
    • 7.5
    • 10

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  • Max. Resisting Force Value(N)

    • 245
    • 294

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  • Max. Absorbed Energy (per Minute)(J/min)

    • 5.0
    • 14.7

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  • Cap Color

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    • B (Black)
    • C (Yellow)
    • D (Green)
    • E (Red)

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