Rubber Spring SRX [Overview]
Pressure Source Components■Load - Stroke Design
Refer to the SRX "load - deflection diagram" for load design.

Great improvement of durability

Use the compression line (black line) for the load - deflection diagram.
SRX is the product with a special blending method of various

Select the appropriate keeper size that can withstand the end pressure.

rubbers. It is resistant to large deflection (35%) and high load.
Example ：SRX h 80xL140

Permanent set is limited. It is very cost effective compared toSRX80-140

Stroke：49 mm (deflection: 35%)

coil springs or urethane springs.

28

A：Start pressure (20 mm beforebottom dead center) = 8.5 kN■ Features= 15 kN

Load (kN)With 35% deflection, durability of 1,000,000 strokes is achieved.
It is excellent in oil resistance, chemical resistance, heat resistance,
dust resistance and corrosion resistance.

・Permanent set:Compression
Return20

B：End pressure (bottom dead center)

・Durability:

InitialValue

24

16 15128

With 35% deflection, 2% or less permanent set is achieved at 300,000Bstrokes.

4

Permanent distortion appears extreme by 10,000 strokes, progresses

08.5A

12

gradually to 50,000 strokes, and then stabilizes.
・Maximum deflection: 35%2949

243648
Deflection (mm)60・Double stack can be allowed when the allowable maximum deflection is 30% or less and L/D
is 1.6 or less.

When the SRX is compressed, the outer diameter is bulged. The bulge rate is not relevant to the0hDδ−hD
spring size. It ΔD=is proportional
to thedeflection rate and the rate is almost
p100％

constant of ΔD = 0.81δ

Temperature rise reaches a balancedhD0hDδ−hD
0p100％hD 0hD0bulge diameter and the wall is at least 5 mm.

resistance of the SRX is 80 C.
LSL SL
δ=diameter,p100％
hDδ: Maximum outer
S: Deflection mm
L
Therefore hDδ= (1＋0.81 S ) phD0
L ShDδ= (1＋0.81) phD
0
The required clearance
between themaximumL

2. Dust resistance
The SRX is resistant to atmosphericdebris. If debris gets imbedded in theAt least 5 mmhDδ

SRX surface and crack develops, it will
not affect performance. Use RSX as is.
3. Scratch resistance■Storage・In order to protect against ultraviolet rays, store away from direct sunlight.
・Deterioration is faster under conditions of high temperature or humidity.
1129strokes. The larger the volume, deflection
the larger temperature. Continuous heatSLS Initial length mm
δ=p100％hD0 : Initial outerdiameter
mm, L:hDδ=(1＋0.81) phD0

value and becomes constant around 1,000rate and strokes per minute (spm) are,Deflection rate: δ= S p100％
Where

When the SRX is repeatedly compressed,
it generates heat with hysteresis effect.

hD 0Bulge rate ofΔD= hDδ−hD 0 p100％
outer diameter：ΔD=1. Heat resistance

We recommend putting a desiccant in the container and storing in as cool a location as possible.

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If the SRX has scratches in thecompression direction, it may not be

4. Durability
At the deflection of 35%, the durability is one
million strokes.
5. Oil and Chemical Resistance
Water
Ethyl Alcohol
Paint Thinner
Hydrochloric Acid
Sulfuric Acid
Nitric Acid
Grinding Oil
Machine Oil
GreaseGasoline
Brine
Methyl alcohol

122×××233×12Acetone
Ammonia
Rust Proofing OilTrichlene
Oxalic Acid
TarToluene
PhenolBenzene
Acetic Acid
Glycerin

32××22×3××2

Pressure SourceComponents■Range of Application■ Bulge of Outer Diameter

1 = excellent resistance
2 = good resistance3 = mediocre resistancep = not resistantbroken immediately. It is better to replace
it at an early stage.

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1130

Rubber Spring SRX [Overview]
Pressure Source Components■Application Example■Conditions for Use

Pad Cushion (Free Compression Type)・Use at or below the stated deflection ratio.

① If holding force is required to prevent the Rubber Spring from coming off, use a Rubber

・The urethane spring seating surface requires an external diameter of > 20 mm.

Spring with SORTB of the Retainer with enhanced holding force.
② It is recommended that resin spacer SOIS be used to prevent heating between rubber

・The clearance around each spring must be sufficient to prevent any contact with theneighboring components.
・Exposure to ultraviolet and sunlight must be avoided.

springs when the SRX is used in stages.
③ Use guide pin (manufactured by customer) with the diameter smaller by 1 to 2 mm than the・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 whenrubber inner diameter and with precision finish ( 1.6 ).
④ When the SRX is used in stages, use the length per SRX which is 1.6 times the diameter.

disassembling press dies.
・Note that the rubber spring may come loose from the retainer due to its adsorptive properties（1）

Clearance hole
Within (rubber inner diameter +2〜3 mm)（2）（3）（4）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.

1.6D or less2D or less10(3.2D＋20 or less)HolderhB
Seating diameter
PadhW

Pressure Source
Components

Deep hole diameter

Cam Return Cushion (Forced Initial Compression Type)Wear Plate

DriverSlider

Angle

Nut

SpacerBlock
Guide Pin

1131

1132

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Rubber Spring
Pressure Source Components
Catalog No.

DhD
hd

Load F［kN］

40

L

ShV

50

SRXSRXThB

63hW

SRXT (with Retainer)

80

S

L1

Lm40〜63

L-S

L

100

L

30＊1
4050
63
80
50
63
80
100
63
80
100
125
80
100
125
140
160
100
125
140
160

S=Lx35%
SF［kN］

V

L1

B

W

dRetainer usedfor SRXT

10.5

ーー

14.0

8.0

SORTA14-10

17.5

3.2

52

4.5

22.1

13.0

28.0

14.0

17.5

4.5

22.1
28.0

5.5

65

12.9
14.0

35.0

27.0

22.1

12.9

28.0

14.0

35.0

10.0

8127.043.8

43.2

28.0

10.0

35.0
43.8

103

39.2
49.0

56.0

62.0

35.0

23.0

49.0

g62

SORTA14-20
SORTB1470

g75

14SORTA14-20
SORTB14SORTA14-20

85

g91

110

g114

SORTB14

23.0
15.0

49.0

43.8

60

24.5

129

56.0

39.2
49.0

22

130

SORTB22

g139

62.0

F value in above chart shows average force. Load-deflection diagram shown next page is from actual test data.
＊1 40-30 is SRX only.
SORTA (Retainer)

Catalog No.

DL

SRX
SRXT

50508080

SLm80 or more

Pressure Source
Components

SRXL

L1Refer to page 1192 for the spacer for stack use of springs.

30

L-S・Retainers are SORTA for overall rubber spring lengths of 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.

SORTB (Retainer)〈Material〉Special blend rubber

Refer to page 1191 for attached retainer size.
1133

1134

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Rubber Spring

SRX Load-Deflection Diagrams
Pressure Source Components
Compression

7446655332434322111369
Deflection (mm)1201551015202506

Deflection (mm)1218243007446655331021510152025

Deflection (mm)081624

Deflection (mm)3240

Load (kN)

SRX50-100

7Load (kN)

SRX50-80

5Load (kN)

SRX40-63

5Load (kN)

SRX40-50

261218
Deflection (mm)2430

102030
Deflection (mm)4050

Deflection (mm)434322110102030

Deflection (mm)40500Pressure SourceComponents102Load (kN)

SRX50-63

7Load (kN)

SRX50-50

5Load (kN)

SRX40-40

5Load (kN)

SRX40-30

ReturnSRX40-80
5Load (kN)

432101135

816243240

Deflection (mm)Copyright © Sankyo Oilless Industry, Inc. All Rights Reserved.

1136

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Rubber Spring

SRX Load-Deflection Diagrams
Pressure Source Components
Compression

20101016168812126442208162432400848

Deflection (mm)1624320408481624324001010161688121244220122436

Deflection (mm)48600

Load (kN)

20Load (kN)

SRX80-140

20Load (kN)

SRX80-125

12Load (kN)

SRX63-1251268243648

6003648606480

8441224

Deflection (mm)SRX63-100

612

Deflection (mm)Deflection (mm)12Deflection (mm)243648600163248

Pressure Source
Components

6Load (kN)

SRX80-100

20

Load (kN)

SRX80-80

12Load (kN)

SRX63-80

12Load (kN)

SRX63-63

ReturnDeflection (mm)Deflection (mm)SRX80-160
20Load (kN)

16128401632486480

Deflection (mm)1137

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

1138

Rubber Spring

SRX Load-Deflection Diagrams
Pressure Source Components
Compression

3025252020
Load (kN)

SRX100-125

30

1515

10105501224

36

48

60012

Deflection (mm)3025252020
Load (kN)

SRX100-16030

Load (kN)

SRX100-140

1510551632

48

Deflection (mm)3648606480This page intentionally left blank

1510024

Deflection (mm)0163248
Deflection (mm)64

Pressure SourceComponents

Load (kN)

SRX100-100Return

8011391140

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

hD
hd1＋0.5
0Retainer, Spacer
Pressure Source Components
SORTA

K

K (Retainer)

hd ＋ 0.1
0L2＋ 1.0

hd2

LCatalog No.

H＋ 0.5H− 00.5

hD

hd
115°
L1T

hD1T

R2

L45°

hd − 00.3〈Material〉SS400 or S25C

NominalL

141020

SORTA

D1630

2022223524d913

Catalog No.

Nominal

LSORTA

2030

L1L22337510

Applicable Rubber Spring, Urethane Spring
Outer Diameter

Length30, 40〜4030n63

hd2〈Material〉SS400

Catalog No.

Nominal

D1K101219.5

15221850n63dd2

HT

111251320660n12560n60n120

Catalog No.

Nominal70n10060n200K

10SOIS1C

2-

310

hD2hdhD

hD15hd0.

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

1422191314950632720221380

100

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

Catalog No.

Nominal

D65SOIS50638010080100125d1321

Applicable Rubber Spring, Urethane Spring
Outer Diameter
3040606370809010050

Inner Diameter

Guide Pin Diameter

141220110

2220

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

Catalog No.

NominalCatalog No.

NominalSORTB

14SOIS

6311911192

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