Strain Wave Gear System × CYCLO Drive Gear

Compact Size, High Torque, and High Rigidity
No.L2054E-3

Sumitomo’s compact High Precision Gearboxes
E CYCLO®
High Precision Gearboxes

ECYSeriesCYCLO® Drives were created anddeveloped by Sumitomo.
This unique reducer structure without
teeth (trochoid tooth profile*) is being
used in industrial robots and transfer devices all over the world.
The ECY Series, which was developed as a compact non-backlash reducer,
integrates the strain wave gear with the engagement theory of the CYCLO
Drives, thus realizing unprecedented high rigidity and a compact structure.
* Epitrochoid parallel curves

Structure

Oil seal for slow speed shaft

Main bearing(Cross roller bearing)Thrust plate

Slow speed end cover

Oil seal for high speed shaft

Bearing for eccentric

Eccentric high speed shaft
Bearing for high speed shaft
Cycloid spline

High speed end coverOuter race

Output ring gear housing

Ring gear housing

Operating Principle
As a principle rule, the ECY Series consists of 4 parts.
• The bearing for eccentric deforms the cycloid spline into an elliptical shape.
• The major axis of the cycloid spline that was deformed into an elliptical shape engages the fixed ring gear housing and the output ringgear housing.
• When the fixed ring gear housing is fixed and the bearing used for the eccentric body is turned 1 rotation in the clockwise direction, thecycloid spline rotates in the counterclockwise direction by an amount corresponding exactly to the difference in the number of teeth,
while it is elastically deforming.
• This amount of rotation is transmitted to the output ring gear housing.

Main bearing(Cross roller bearing)
Output ring gear housing(Same number of teeth asthat on the cycloid spline)

Bearing forhigh speed shaft

Cycloid spline

Ring gear housing(The number of teeth is 2 more than thenumber of teeth on the cycloid spline)

Fixed ring gear
housing side

Output ring gear
housing side

0°

120°

240°

360°

Features
Large diameter of high speed hollow shaft

The diameter of high speed
hollow shaft is large, whichenables effective use of its
space; for passing the cable, as
the space for the shaft, etc.

Reduction of customer’s assembly steps

Because the high speed shaft
is supported by the reducer
and the grease is packed in asealed structure, it is easy tomount the shaft on the device
or on the motor.

Compact and high torqueHigh rigidity
Torsional Stiffness (Nm/arc min)Allowable Peak Torque (Nm)150

Generalstrain wave gear A

125General
strain wave gear B

100

ECY Series

7550
2506080

100

12014015

ECY Series(Sumitomo)

General strain
wave gear

10

5060

80

100120140

External dimensions (mm)External dimensions (mm)It has high torque compared to that of a general wave gear
(equivalent size), contributing to make the device morecompact.

The torsional stiffness is larger than that of a general strain
wave gear (equivalent size).Thus it can increase the device's
strength and reduce vibration, etc.

Ratcheting resistence (safety under overload)

Reasons for exceptional strength

Ratcheting torque measurement

Examples ofgeneral strain
wave gears

ECY Series

External gearprofileCup type/Hat type

Cylindrical type

Tooth contact
in the tooth
trace direction

Partly gear meshing(30-50%)Fully gear meshing(≒100%)

Elliptical bearing
structure

Ball bearing

Roller bearing

1400

Load torque (Nm)

1200
1000800ECY Series(Sumitomo)

600Ratcheting

400General strain
wave gear

2000Torsion angle
The structure suppressing ratcheting (situation where teeth
do not engage smoothly) realizes high safety underoverload.

Nomenclature
E CY

The structure differs from a general strain wave gear, realizing
high strength.

Rating203

Note 2
Note 1 Allowable peak torque

Frame Reduction Rated output torque
ratio
size

50

Reduction
ratio
50, 80, 100

203

Auxiliary type

Frame size
203, 205, 107
Special specification
Standard : Blank, Special specification : S
Series symbol

Model symbol
Symbol of E CYCLO

205107at accelerationand decelaration

Nm

kgf･m

Nm

kgf･m

50

21

2.1

44

4.5

80

29

3.0

56

5.7

100

31

3.2

70

7.1

50

33

3.4

73

7.4

80

44

4.5

96

9.8

100

52

5.3

107

10.9

50

39

4.0

98

10.0

80

63

6.4

137

14.0

100

67

6.8

157

16.0

Note 3

Lost motion
arc min

111

Note : 1. The rated torque indicates the allowable output torque at the output
flange at an input speed of 2000 r/min.
2. This is the peak torque allowed during normal acceleration anddeceleration.
3. This is torsion angle (representative value) under the load of the rated
torque × ±3%.
4. Please inquire us for specifications other than the above.

Outline Drawing
ECY-203(10.2)

Mass 0.9kg

Ø3.4(Ø54 h7)

4.7 5.5(M3)A (2.5:1)

16 PLACES
16×M3

16×Ø3.4 THRU

22.5°

1010.1

A

∅

18°

30°

6×M2 DEPTH4

6836°(32.5)

10∅22

∅4

Ø55.8

Ø74 h7

Ø19 H7

Ø24.9 h7

Ø56 h7

Ø54 h7(Ø48)
(Ø35)

(Ø62)

Ø74 h78R0.4＊5(1.4)

7.7 18.5(Ø64 h7)
22.5°

Ø3.4

4.2 5.5∅78

16×M34 20.9(9.7)

Mass 1.2kg

22.5°

(4.6)

16.3

52.5

* indicates Ø74h7.

ECY-205＊(M3)

A (2.5:1)

16 PLACES(24)1410.2

45°

2.5.5

455

∅2

∅

A

16×∅3.4 THRU

18.4R0＊(1.3)* indicates Ø84h7.

5
7.9 21.5

15.8
4 21.3＊56(5.5)

Ø84 h7

Ø61.8

Ø27 h7

Ø21 H7

Ø62 h7(Ø55.5)(Ø40)

Ø84 h7(Ø71)
Ø64 h7

8×M2 DEPTH4

Outline Drawing
ECY-107
Mass 1.6kg(11.2)(Ø72 h7)

Ø4.5

4.2

A (2.5:1)

16 PLACES
12.5

16×∅4.5 THRU

(28)

45°

17.5
8.8

A

2.563
∅

∅
87.5

16×M4

22.5°(M4)

∅ 30

22.5°

7

Ø68.8

Ø95 h7(Ø45)Ø95 h7(Ø80)
Ø72 h7(Ø63)Ø69 h7

Ø34.5 h7

Ø25.5 H7

8×M3 DEPTH6.4

R0＊5＊(1)* indicates Ø95h7.

6.5

4.5
22.7

58

16.75(6.6)

23.3

Worldwide Locations
North America / South America
Sumitomo Machinery Corporation of America(SMA)
4200 Holland Blvd. Chesapeake, VA 23323, U.S.A.
TEL (1)757-485-3355 FAX (1)757-485-7490

China
Sumitomo (SHI) Cyclo Drive Shanghai, Ltd. (SCS)
11F, SMEG Plaza, No. 1386 Hongqiao Road,
Changning District, Shanghai, China 200336
TEL (86)21-3462-7877 FAX (86)21-3462-7922

SM Cyclo of Canada, Ltd. (SMC)
1453 Cornwall Road, Oakville, Canada ON L6J 7T5
TEL (1)905-469-1050 FAX (1)905-469-1055

TaiwanTatung SM-Cyclo Co., Ltd. (TSC)
22 Chungshan N. Road 3rd., Sec. Taipei, Taiwan 104,
R.O.C.
TEL (886)2-2595-7275 FAX (886)2-2595-5594

EuropeSumitomo (SHI) Cyclo Drive Germany GmbH(SCG)
Cyclostraße 92, 85229 Markt Indersdorf, Germany
TEL (49)8136-66-0 FAX (49)8136-5771
India
Sumi-Cyclo Drive India Private Limited (SDI)
Gat No. 186, Raisoni Industrial Park, Alandi Markal Road,
Fulgaon-Pune, Maharashtra, India
TEL (91)96-0774-5353
Southeast Asia / Oceania
Sumitomo (SHI) Cyclo Drive Asia Pacific Pte.
Ltd. (SCA)
15 Kwong Min Road, Singapore 628718
TEL (65)6591-7800 FAX (65)6863-4238

Korea
Sumitomo (SHI) Cyclo Drive Korea, Ltd. (SCK)
Room #913, Royal Bldg, Saemunan-ro 5 gil 19,
Jongro-gu, Seoul, Korea 03173
TEL (82)2-730-0151 FAX (82)2-730-0156
Japan
Sumitomo Heavy Industries, Ltd. (SHI)
ThinkPark Tower, 1-1 Osaki 2-chome, Shinagawa-ku,Tokyo 141-6025, JapanTEL (81)3-6737-2511 FAX (81)3-6866-5160

Specifications, dimensions, and other items are subject to change without prior notice.

Power Transmission & Controls Group
Headquarter ThinkPark Tower, 1-1 Osaki 2-chome, Shinagawa-ku, Tokyo 141-6025, Japan

No.L2054E-3.1
EI12 Printed 2022.01