Rubber Spring SRV [Overview]
Pressure Source Components
Load comparison: Example of h63-100

Load is increased twice compared tothe previous type.

20

With innovation of material and manufacturing, SRV has
improved performances in various characteristics; load,permanent set, durability, etc. The cost effectiveness isexcellent compared to coil springs or urethane springs.

18

SRV

Compression
Return16

SRX

Compression
ReturnSRV80-14040

Refer to the SRV "load - deflection diagram" for load
design. Use the compression line (solid line) for theload - deflection diagram.

SRV32

Load (kN)

Load (kN)

14■Load - Stroke Design

12108

InitialValue

Compression
ReturnConstant
Value

Compression
Return2416SRX6842122436
Deflection (mm)■ Features
・Durability:

With 35% deflection, durability of 300,000 strokes is achieved.
It is excellent in oil resistance, chemical resistance, heat resistance, dustresistance and corrosion resistance.
・Permanent set:
With 35% deflection, 4% or less permanent set is achieved at 300,000strokes.
Permanent distortion appears extreme by 10,000 strokes, progresses
gradually to 50,000 strokes, and then stabilizes.
・Maximum deflection: 35%・Double stack can be allowed when the allowable maximum deflection is 30% or less and L/Dis 1.6 or less.

■ Bulge of Outer DiameterhD 0Sp100％LWhereS
δ=p100％hD0 :Initial outer diameter
mm, L :SInitial length mm
L(1＋0.81hDδ=) phD0
hDδ:Maximum outer diameter
S mm,LS:Deflection mm
δ=p100％SL
Therefore, hDδ= (1＋0.86) phD0LShDδ= (1＋0.86 ) phD0
■StorageLLS

When the SRV is compressed, the outer diameter is bulged. The bulge rate is not
relevant to the spring size. It is proportional to the deflection rate and the rate is almost
0hDδ−hDconstant of ΔD=
ΔD=0.86δ
Therequired
p100％
hD00clearance between thehD
maximumbulgehDδ−hD 0
diameter andΔD=
the wall is at least 5p100％
mm.
hD 0
Bulge rate ofhDδ−hD 0
outer diameter : ΔD=
p100％
Deflection rate: δ=At least 5 mm

04816

■Application range
1. Heat resistance
When the SRV is repeatedly compressed,
it generates heat with hysteresis effect.
Temperature rise reaches a balanced
value and becomes constant around 1,000strokes. The larger volume, deflection
rate and strokes per minute (spm) are,the larger temperature. Continuous heat
resistance of the SRV is 80 C.
2. Dust resistance
The SRV is ver y resistant to theatmosphere with much dust or machined
powder. If such dust or powder is buriedin the pressurizing surface or fixed area,
crack does not grow. Use the SRV as it is.
3. Scratch resistanceIf the SRV has scratches in the compression
direction, it may not be broken immediately.
It is better to replace it at an early stage.

3248

64

Deflection (mm)4. Durability
At the deflection of 35%, the durability is300,000 strokes.
5. Oil resistance and chemical resistance
Water
Ethyl Alcohol
Paint Thinner
Hydrochloric Acid
Sulfuric Acid
Nitric Acid
Grinding Oil
Machine Oil
GreaseGasoline
Brine
Methyl alcohol

122×××2
33×
1
2Acetone
Ammonia
Rust Proofing Oil
Trichlene
Oxalic Acid
TarToluene
PhenolBenzeneAcetic Acid
Glycerin

32××22×3××2

Pressure Source
Components

0

1 = excellent resistance
2 = good resistance3 = mediocre resistancep = not resistant■ Conditions for UsehDδ

・In order to protect against ultraviolet rays, store away from direct sunlight.
・Deterioration is faster under conditions of high temperature or humidity.
We recommend putting a desiccant in the container and storing in as cool a location as possible.

1141

Copyright © Sankyo Oilless Industry, Inc. All Rights Reserved.

・Use at or below the stated deflection ratio.
・The urethane spring seating surface requires an external diameter of > 20 mm.
・The clearance around each spring must be sufficient to prevent any contact with theneighboring components.
・Exposure to ultraviolet and sunlight must be avoided.
・Guide pins should be S25C equivalent or better and finished within Ra1.6.
・Since rubber springs have adsorptive properties, be careful not to drop parts whendisassembling press dies.
・Note that the rubber spring may come loose from the retainer due to its adsorptive properties
and may not hit the seat parallel to the seat surface.
・If holding force is required to prevent the Rubber Spring from coming off, use a Rubber Springwith SORTB of the Retainer with enhanced holding force.

Copyright © Sankyo Oilless Industry, Inc. All Rights Reserved.

1142

Rubber SpringHigh Load Type

Pressure Source Components
Catalog No.

DLhD
hd

Load F［kN］

hD
hd
S

LoadhV
F［kN］

LL

ShV

SRV
SRVThBhW
hB
hW

S

L128 L1

Catalog No.

28

SRV
SRVT

L-S

20

L20

L

Lm50n63

L-SS

SRVT (with Retainer)

50635080
1006380
63
100
12580
10080 125
140
160
100
125
100
140160SORTA (Retainer)＊L1g4

SORTA (Retainer)

＊L1g4

S

S=Lx35%Initial Stabilized Value (5〜30strokes)
Value
L1V
F [kN] F [kN]

17.5

4.522.0

13.0

28.0

121065

14.0

35.0

27.0

22.0

13.0

28.0

14.0

35.0

181681

27.0

44.0

43.0

28.0

10.0

35.0
44.0

2710470

g75

d Hardness

Retainerused forSRVTSORTA14-20
SORTB14148587g91

SORTA14-20
SORTB1439.0 110 g114
49.0

56.0

62.0

35.0

23.0

49.0

W

23.0
3149.0

44.0

B49

42

129

56.0

39.0
49.0

2286

SORTB22130 g139

62.0

DL

6380

100
140

Refer to page 1192 for the spacer for stack use of springs.
・Retainers are SORTA for overall rubber spring lengths of 40, 50, and 63 mm, and SORTB for overallrubber spring lengths of 80 mm and longer.
・Since rubber springs have adsorptive properties, be careful not to drop parts when disassemblingmolds.

L130

L-S30

L

L-SL

L1SS

Lm80 or more

Pressure Source
Components

SRV

SORTB (Retainer)
SORTB (Retainer)〈Material〉Special blend rubber

1143

Refer to page 1191 for attached retainer size.

Copyright © Sankyo Oilless Industry, Inc. All Rights Reserved.

1144

Copyright © Sankyo Oilless Industry, Inc. All Rights Reserved.

Rubber Spring

SRV Load-Deflection Diagrams
Pressure Source Components
Compression
ReturnInitialValue
241212121888061218024

Deflection
mm02.556612182406

Deflection (mm)7.5 10 12.5 15 17.5

Deflectionmm

Load124

Deflection (mm)Load844

Load (kN)

SRV63-80

16

Load (kN)

SRV63-6316

Load (kN)

SRV50-6316

Load (kN)

SRV50-50

012180248

Deflectionmm

Load0162432

Deflection (mm)Deflection (mm)

3.0 6.3 9.0 13.0 16.0 19.0 22.0

Compression
ReturnConstantValue

3.0 6.3 9.0 13.0 16.0 19.0 22.0

Deflectionmm

Load0481216202428

Initial Compression 0.0 1.4 2.8 4.2 5.7 7.4 9.4 12.0
Value Return 0.0 0.6 1.4 2.2 3.3 4.6 6.9 12.0

Initial Compression 0.0 1.4 2.8 4.2 5.7 7.4 9.4 12.0
Value Return 0.0 0.6 1.4 2.2 3.3 4.6 6.9 12.0

Initial Compression 0.0 2.5 4.8 6.9 9.3 11.7 14.6 18.3
Value Return 0.0 1.2 2.5 4.5 6.5 9.0 11.5 18.3

Initial Compression 0.0 2.5 4.8 6.9 9.3 11.7 14.6 18.3
Value Return 0.0 1.2 2.5 4.5 6.5 9.0 11.5 18.3

Constant value Compression ー

0.8 2.0 3.3 4.7 6.3 8.2 10.8

Constant value Compression ー

0.5 1.7 2.9 4.2 5.7 7.6 10.7

Constant value Compression ーConstant value Compression ーー

0.4 1.2 2.2 3.2 4.5 6.3 10.8ー

0.3 1.1 1.9 2.9 4.2 6.2 10.7ー

5〜300,000
Returnstrokes

Load in compression (reference)

5〜300,000
Returnstrokes

5〜300,000
Returnstrokes

1.6 3.7 5.6 7.6 10.0 12.7 16.5
1.0 2.3 3.6 5.5

7.5 10.2 16.5

Load in compression (reference)

Load in compression (reference)

5〜300,000
Returnstrokes

ー1.4 3.5 5.5 7.6 10.0 12.7 17.8
0.7 1.7 3.3 4.8

7.3 9.9 17.8

Load in compression (reference)

Deflection [mm]

9.5

11.5

13.5

15.5

Deflection [mm]

14.0

16.0

18.0

20.0

Deflection [mm]

14.0

16.0

18.0

20.0

Deflection [mm]

20.0

22.0

24.0

26.0

Load [kN]

4.4

5.5

7.0

8.6

Load [kN]

4.7

5.7

6.9

8.4

Load [kN]

8.5

10.0

12.0

14.0

Load [kN]

10.0

11.3

12.7

15.2

1212181888440102030040

Deflectionmm04812610203040012

Deflection (mm)16202428

Load126

Deflection (mm)Load12

Deflection
mm051015

Pressure Source
Components

24

Load (kN)

SRV63-12524

Load (kN)

SRV63-100

16Load (kN)

SRV50-100

16Load (kN)

SRV50-80

24360

48

1220253035

Load

Deflection
mm051015243648

Deflection (mm)Deflection (mm)20253035

Load

Deflection
mm06

131925313844

Initial Compression 0.0 1.4 2.8 4.2 5.7 7.4 9.4 12.0
Value Return 0.0 0.6 1.4 2.2 3.3 4.6 6.9 12.0

Initial Compression 0.0 1.4 2.8 4.2 5.7 7.4 9.4 12.0
Value Return 0.0 0.6 1.4 2.2 3.3 4.6 6.9 12.0

Initial Compression 0.0 2.5 4.8 6.9 9.3 11.7 14.6 18.3
Value Return 0.0 1.2 2.5 4.5 6.5 9.0 11.5 18.3

Initial Compression 0.0 2.5 4.8 6.9 9.3 11.7 14.6 18.3
Value Return 0.0 1.2 2.5 4.5 6.5 9.0 11.5 18.3

Constant value Compression ー

0.5 1.6 2.9 4.2 5.7 7.5 10.4

Constant value Compression ー

0.4 1.6 2.8 4.1 5.6 7.5 10.3

Constant value Compression ーConstant value Compression ーー

0.2 1.0 1.9 2.9 4.2 6.2 10.4ー

0.2 1.0 2.0 2.9 4.1 6.0 10.3ー

5〜300,000
Returnstrokes

Load in compression (reference)

5〜300,000
Returnstrokes

5〜300,000
Returnstrokes

1.4 3.5 5.7 7.8 10.2 12.7 16.1
0.7 1.6 3.5 5.6

7.9 10.7 16.1

Load in compression (reference)

Load in compression (reference)

5〜300,000
Returnstrokesー

1.3 3.5 5.3 7.6 10.0 13.0 17.0
0.5 1.8 3.5 5.3

7.7 10.6 17.0

Load in compression (reference)

Deflection [mm]

20.0

22.0

24.0

26.0

Deflection [mm]

27.0

29.0

31.0

33.0

Deflection [mm]

27.0

29.0

31.0

33.0

Deflection [mm]

36.0

38.0

40.0

42.0

Load [kN]

5.7

6.4

7.5

8.6

Load [kN]

6.3

7.0

8.0

9.0

Load [kN]

11.1

12.2

13.4

14.7

Load [kN]

12.2

13.0

14.5

15.8

1145

1146

Copyright © Sankyo Oilless Industry, Inc. All Rights Reserved.

Copyright © Sankyo Oilless Industry, Inc. All Rights Reserved.

Rubber Spring

SRV Load-Deflection Diagrams
Pressure Source Components
InitialValue
3224242416

Load (kN)

SRV80-16032Load (kN)

SRV80-10032

Load (kN)

SRV80-80

1688162432

Deflection
mm04801224360481616202428

Deflectionmm

Load0510324864

Deflection (mm)Deflection (mm)121520253035

Load

Deflection
mm08162432404856

Initial Compression 0.0 3.3 6.7 10.3 14.5 19.0 24.0 30.8
Value Return 0.0 1.6 4.0 6.5 9.5 13.0 18.5 30.8

Initial Compression 0.0 3.3 6.7 10.3 14.5 19.0 24.0 30.8
Value Return 0.0 1.6 4.0 6.5 9.5 13.0 18.5 30.8

Initial Compression 0.0 3.3 6.7 10.3 14.5 19.0 24.0 30.8
Value Return 0.0 1.6 4.0 6.5 9.5 13.0 18.5 30.8

Constant value Compression ー

1.7 4.7

7.8 11.2 15.2 20.2 27.0

Constant value Compression ー

1.8 5.0

8.2 11.5 15.3 20.4 27.5

Constant value Compression ー

1.7 5.0

8.0 11.3 15.5 20.5 27.8ー

0.5 2.5

5.1 7.8 10.2 15.0 27.0ー

0.6 2.6

5.2 7.7 10.8 16.0 27.5ー

0.4 2.5

5.4 8.0 11.4 16.2 27.8

5〜300,000
Returnstrokes

Load in compression (reference)

5〜300,000
Returnstrokes

Load in compression (reference)

5〜300,000
Returnstrokes

Load in compression (reference)

Deflection [mm]

20.0

22.0

24.0

26.0

Deflection [mm]

27.0

29.0

31.0

33.0

Deflection [mm]

48.0

50.0

52.0

54.0

Load [kN]

15.2

17.5

20.2

23.4

Load [kN]

17.2

19.3

21.7

24.4

Load [kN]

20.5

22.2

24.0

25.8

2424

Pressure Source
Components

32

Load (kN)

SRV80-14032

Load (kN)

SRV80-125

1616880122436

48016

Deflectionmm032

4864

Deflection (mm)Deflection (mm)
LoadCompression
Return8

Deflection (mm)
LoadConstantValue

1680Compression
Return6.0 12.5 19.0 25.0 31.0 38.0 44.0

LoadDeflection
mm07142128354249

Initial Compression 0.0 3.3 6.7 10.3 14.5 19.0 24.0 30.8
Value Return 0.0 1.6 4.0 6.5 9.5 13.0 18.5 30.8

Initial Compression 0.0 3.3 6.7 10.3 14.5 19.0 24.0 30.8
Value Return 0.0 1.6 4.0 6.5 9.5 13.0 18.5 30.8

Constant value Compression ー

1.7 4.8

7.8 11.3 15.2 20.3 27.2

Constant value Compression ー

1.8 5.1

8.1 11.2 15.2 19.8 26.8

ー0.5 2.8

5.2 8.0 11.0 15.7 27.2

ー0.7 2.7

5.5 8.2 11.6 16.1 26.8

5〜300,000
Returnstrokes

Load in compression (reference)

5〜300,000
Returnstrokes

Load in compression (reference)

Deflection [mm]

36.0

38.0

40.0

42.0

Deflection [mm]

41.0

43.0

45.0

47.0

Load [kN]

19.0

20.3

22.9

25.1

Load [kN]

19.2

20.8

22.6

24.6

1147

1148

Copyright © Sankyo Oilless Industry, Inc. All Rights Reserved.

Copyright © Sankyo Oilless Industry, Inc. All Rights Reserved.

Rubber Spring

SRV Load-Deflection Diagrams
Pressure Source ComponentsCompression
ReturnInitial
Value564242
Load (kN)

SRV100-12556

Load (kN)

SRV100-100281428140122436

48012

Deflection
mm0510243648

Deflection (mm)Deflection (mm)
LoadCompression
ReturnConstantValue

1520253035

Deflectionmm

Load06.0 12.5 19.0 25.0 31.0 38.0 44.0

Initial Compression 0.0 6.1 11.5 16.9 23.3 30.2 38.8 48.9
Value Return 0.0 2.5 6.4 10.5 14.4 20.6 29.2 48.9

Initial Compression 0.0 6.1 11.5 16.9 23.3 30.2 38.8 48.9
Value Return 0.0 2.5 6.4 10.5 14.4 20.6 29.2 48.9

Constant value Compression

Constant value Compression

5〜300,000
Returnstrokes–

2.4

7.8 13.5 19.0 24.9 31.4 42.2–

0.4

4.0 8.5 12.8 17.4 23.8 42.2

Load in compression (reference)

5〜300,000
Returnstrokes–

2.7

8.4 13.4 18.4 24.2 31.2 42.5–

0.2

3.6 7.4 11.2 16.5 24.0 42.5

Load in compression (reference)

Deflection [mm]

27.0

29.0

31.0

33.0

Deflection [mm]

36.0

38.0

40.0

42.0

Load [kN]

27.4

30.4

33.8

37.7

Load [kN]

29.5

31.2

35.5

39.0

424228Pressure SourceComponents

56

Load (kN)

SRV100-16056

Load (kN)

SRV100-140

28141401632

4806416

Deflection (mm)LoadThis page intentionally left blank

Deflection
mm071421324864

Deflection (mm)28354249

LoadDeflection
mm08162432404856

Initial Compression 0.0 6.1 11.5 16.9 23.3 30.2 38.8 48.9
Value Return 0.0 2.5 6.4 10.5 14.4 20.6 29.2 48.9

Initial Compression 0.0 6.1 11.5 16.9 23.3 30.2 38.8 48.9
Value Return 0.0 2.5 6.4 10.5 14.4 20.6 29.2 48.9

Constant value Compression

Constant value Compression

5〜300,000
Returnstrokes–

2.5

8.1 13.7 19.1 25.0 33.5 43.5–

0.5

4.4 8.7 12.2 17.4 25.2 43.5

5〜300,000
Returnstrokes–

3.0

8.6 13.6 19.0 25.0 32.6 43.0–

0.2

4.0 8.2 12.6 17.4 24.2 43.0

Load in compression (reference)

Load in compression (reference)
Deflection [mm]

41.0

43.0

45.0

47.0

Deflection [mm]

48.0

50.0

52.0

54.0

Load [kN]

32.0

34.6

37.4

40.3

Load [kN]

32.6

35.0

37.5

40.1

11491150

Copyright © Sankyo Oilless Industry, Inc. All Rights Reserved.

Copyright © Sankyo Oilless Industry, Inc. All Rights Reserved.

hD
hd1＋0.5
0Retainer, Spacer
Pressure Source Components
SORTAKK (Retainer)

hd ＋ 0.1
0L2＋ 1.0hd2

L

Catalog No.

H＋ 0.5H− 00.5

hD

hd
115°
L1T

hD1

TR2

L45°

hd − 00.3〈Material〉SS400 or S25C

NominalL

141020

SORTA

D

1630

2022223524

d913

Catalog No.

Nominal

LSORTA

2030

L1L22337510

Applicable Rubber Spring, Urethane Spring
Outer Diameter

Length30, 40〜4030n63

hd2〈Material〉SS400Catalog No.

Nominal

D1K

101219.5

15221850n63dd2

HT

111251320

660n12560n60n120

Catalog No.

Nominal70n10060n200

K10SOIS
1C2-

310hD2hd

hD

hD1

5hd

0.

C

Pressure Source
Components

2-SORTB

10hD〈Material〉Neodel(#25-61N)

730〈Material〉SS400 or S25C

Catalog No.

Nominal

D

D1

D2d

Outer Diameter

SORTB

1422

1913

14

950

63

27

20221380

100

When installing SORTB, set the straight part to the fixed surface side.

Catalog No.

Nominal

D65SOIS5063
8010080100125d1321

Applicable Rubber Spring, Urethane Spring
Outer Diameter
3040606370809010050

Inner Diameter

Guide Pin Diameter

1412201102220

Guide pins should be S25C equivalent or better and finished within Ra1.6.

Catalog No.

NominalCatalog No.

NominalSORTB

14SOIS

631191

1192

Copyright © Sankyo Oilless Industry, Inc. All Rights Reserved.

Copyright © Sankyo Oilless Industry, Inc. All Rights Reserved.