Compact Accumulator

C om p act Accum u la tor
Mode l

JSY0 0 7

Reduce pressure fluctuation caused by temperature change
to a fixture circuit disconnected from a pressure source.
Maintenance-Free Spring Type Accumulator

What is an accumulator?
When fixture (closed circuit) is disconnected from the hydraulic pressure source, with the change in volume of the hydraulic fluid due totemperature changes, pressure will increase or decrease. Accumulator avoids damage or deformation of machine and workpiece caused
by pressure increase, and falling of workpiece caused by pressure decrease.
Oi l
In d ica t or P a r t

Pi s to n

Temperature Change
Hydraulictemperaturegoes up

Hydraulictemperaturegoes downWith accumulator

Without accumulator

Pressure increases as hydraulic temperaturegoes up. The piston is pushed up by spring

Pressure increases as hydraulic temperaturegoes up. Abnormal high pressure may damage

to absorb increased pressure.

the machine and deform the workpiece.

(Absorbs volume of oil expanded)
Pressure decreases as hydraulic temperature

Pressure decreases as hydraulic temperaturegoes down. The piston rod is pushed up by

goes down. Due to a decline of clamping

spring to absorb decreased pressure.

force, machining quality will decrease and(Discharges volume of oil reduced)

workpiece will fall off.

Much More Compact than Comparison Model
The compact accumulator JSY0070-□ is installed to NC table more easily than the comparison model. It is most suitable for equipmentthat has small circuit capacity. (If circuit capacity is large, it is recommended to use multiple number of JSS or JSY007.)NC TableComparison Model
JS S

Compact Model
JS Y 0070-□

More Compact
コンパクトにTurning radius becomes smaller.

Details on backside

KWCS

h t t p : / / w ww.k o s m e k .c o .jp
Sales Document SSL-JSY001-01-GB Written 2014.01.20 Updated -● IF THERE IS ANY UNCLEAR POINT IN THIS LEAFLET, PLEASE CONTACT US.
● SPECIFICATIONS IN THIS LEAFLET ARE SUBJECT TO CHANGE WITHOUT NOTICE.

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model JSY007

Compact Accumulator
External Dimensions！ Caution

417

φ54Indicator ※1
Do not disassemble it.
Internal spring or parts may pop out.

7134436max.10

25806※22512.5φ23

12.5

2-M4×0.7×25 Bolt (Included)

Hydraulic PortO ring：1BP8 (Included)

φ6 or lessNotes※1. Indicator extends according to pressure. Be sure not to interfere with other devices when designing.
※2. Roughness of mounting surface (O-ring seal surface) should be 6.3S or better.
1. Do not disassemble it. Parts may pop out due to the built-in spring.
2. Only mounting in horizontal direction with manifold option is available. For other mounting methods, please use model JSS.

Specifications
Model No.

JSY0070-2

JSY0070-3

JSY0070-4

JSY0070-5

JSY0070-6

JSY0070-7

2.0

3.0

4.0

5.0

6.0

7.0

3.13

6.41

6.41

Standard Operating Pressure

MPa

Withstanding PressureMPa

14.0Discharge Oil Capacity

cm30.5

Absorbing Capacity

cm3Compression Factor (β) ※1 MPa/cm3
Operating Temperature
℃

0.1
1.48

1.48

0〜70

Usable Fluid

General Hydraulic Oil Equivalent to ISO-VG-32

MassNotes

3.13

kg0.3

※1. Compression factor (β) means a pressure change (MPa) per 1cm 3 charge in oil volume.

Characteristic Graph

How to read the characteristic graphEﬀective Temperature Range(℃) by Circuit Capacity(V)(V=50cm3)(V=100cm3)-12.5-10-502.5

Requirements (Reference Example)
Cylinder Capacity
Piping Capacity-6.25-5-2.501.25
JSY0070-77

JSY0070-6

Inside Diameterφ6×0.5m（Pipe capacity per 1m：28.3cm3）

Valve Capacity

8

In case of 7.0cm320cm3

Temperature change ：ΔT -10℃
Operating Pressure：P4.0MPa

Thermal Expansion Coefficient：α8×10-4

Selection Method
6Pressure（MPa）

JSY0070-55JSY0070-44JSY0070-3
3
JSY0070-2
2Discharge
AbsorbOil Capacity Oil Capacity

100.50.4

0.3

0.2

0.1

00.1

Discharge/Absorb Oil Capacity（cm3）

KWCS

h t t p : / / www.k o s m e k .c o .jp
Sales Document SSL-JSY001-01-GB Written 2014.01.20 Updated -1. Calculate Fixture Circuit Capacity (V)Clamp Capacity + Pipe Capacity + Valve Capacity
V = (7.0×1) + (28.3×0.5m) + 20 = 41.15cm3
2. Calculate Change in Capacity (ΔV )Fixture Circuit Capacity (V) x Thermal Expansion Coefficient (α)
x Amount of Temperature Change (ΔT)
ΔV = 41.15 ×（8×10 -4）×（-10）= -0.33 cm33. Select Accumulator TypeOperating pressure (P)= 4.0MPa Select JSY0070-4.
（If required discharge・absorb oil capacity is greater thanchange in capacity, select JSS or use multiple number of JSY007.)
4. Check the accumulator characteristics (Graph on the left)
Pressure after temperature change(-10℃) ：2.96MPa：0.17cm3
Residual oil discharge margin
Notes
1. When selecting, calculate tolerance for the oil capacity taking
the spring force deviation into consideration.
2. Please contact us for larger amount of absorb oil.
● IF THERE IS ANY UNCLEAR POINT IN THIS LEAFLET, PLEASE CONTACT US.
● SPECIFICATIONS IN THIS LEAFLET ARE SUBJECT TO CHANGE WITHOUT NOTICE.

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