Made in Japan
Manufacturer: Fukuda Seiko
Model: FK 6208 (Ball shaft reception (with lubrication and seal) / press-fitting)
Developed by GMN, which has been dealing with machine component parts for more than 100 years, this is a lightweight, space-saving, and high-torque one-way clutch. A mechanism of the ring fastening part called a sprag controls the direction of rotation.
use
Printing Machinery
Conveyor
E-bikes (electrically power assisted bicycles)
Compressor
winch
Generators
Emergency power supply equipment and fire doors
Wheelchair
Features
Suggestions for backstops, indexes, and overrunning
Space-saving and high torque
High-speed swivel motion
High-precision positioning
Minimal moment of inertia
Uniform load distribution due to individual sprag movements
High design freedom with various options: with inner and outer rings
, with axle reception, with keyway, with lubrication and seals
summary
A one-way clutch is a clutch mechanism that transmits power in only one direction, and GMN uses a sprag-type mechanism.
Idle direction Power transmission direction
The friction force generated when the uniquely designed sprag is upright around the entire circumference controls the direction of rotation. Since a static friction force is generated around the entire circumference, both high torque and space saving are achieved.
The slight rotation of the tilt angle of δ minutes makes the splug stand upright.
There are two types of spring structures that fix the splugs, Z type and M type, and use the M type for applications where the angular frequency (angular frequency) is greater than 10 Hz.
You can choose the best clutch from a variety of designs + options.
Series: FK (2RS)
Components:
Insert element
FE 400 Z2
+ Raceway rings
Inner ring press fit
Outer ring press fit
+ Ball bearing
+ Grease lubrication*
+ RS seals*
Width:
12 / 14 / 15 / 16 / 17 / 18 mm
Operating temperature:
max. 140°C
max. 170 °C on request
max. 110°C (series 2RS)
Specifications ◯
Mounting dimensions: 12/14/15/16/17/18 mm (axial direction)
◯ Shaft diameter: 17~40 mm
◯ Heat resistance: up to 140°C (FK… 2RS is up to 110°C)
◯ Lubrication: oil or grease (FK… 2RS is already enclosed)
* FK … RS is one-sided (freewheel side), FK… The 2RS has seals on both sides.
Ball Bearing Freewheel
Clutch Unit FK (2RS)
for press fit (IR and OR)
Components
Freewheel clutch
insert element FE 400 Z2
+ Raceways
inner ring
outer ring
+ Ball bearing
Bearing steel, hardened and ground
Press fit
Press fit- Roller bearing
+ Lubrication
Integrated
Lifetime grease lubrication*
+ Seal
RS seals*
* Series FK 2RS (with RS seals)
36
Characteristics
Dimensions
Dimensions in accordance with bearing series 62 (DIN 625)
Width
12 / 14 / 15 / 16 / 17 / 18 mm
Operating temperature
max. 140°C
Higher temperatures on request
max. 110°C (design 2RS with RS seals)
Lubrication
Series FK 2RS with seals
Operative lifetime grease lubrication
Series FK without seal discs
Oil or grease lubrication (Pg. 60–61)
Delivered with corrosion protection.
Installation
Installation tolerances
Shaft n6; hub N7
Mating parts
Hardening and grinding of the mating parts is not necessary.
Thoroughly clean (grease free) the mating parts in the vicinity of
the freewheel clutch as well as the freewheel clutch’s rings before
making the press fit.
Bearing
The freewheel clutch includes a ball bearing.
Additional external bearing support is not necessary.
Press fit pressure
Press fit pressure must not be applied to the balls.
Clamping direction
The arrow on the inner ring designates the inner ring’s clamping
direction.
Seals*
The RS Seals reliably seal out grease and dust but are not suitable
to protect against permanent higher liquid levels.
Series FK 6203-RS has an RS seal on one side only
(RS Seal on the freewheel side)
FK… (2RS) Model Number List
Model No.
d [mm]
D [mm]
W [mm]
Tnom [Nm]
nmax [min-1]
Cdyn. [N]
Cstat. [N]
r [mm]
Weight [kg]
FK 6203
17
40
12
53
10,800
6,245
3,441
1.0
0.07
FK 6203-RS
17
40
12
53
3,700
6,245
3,441
1.0
0.07
FK 6204
20
47
14
60
7,500
6,869
4,268
1.5
0.12
FK 6204-2RS
20
47
14
60
3,200
6,869
4,268
1.5
0.12
FK 6205
25
52
15
104
5,400
7,448
5,146
1.5
0.15
FK 6205-2RS
25
52
15
104
2,800
7,448
5,146
1.5
0.15
FK 6206
30
62
16
148
5,100
7,859
6,066
1.5
0.23
FK 6206-2RS
30
62
16
148
2,400
7,859
6,066
1.5
0.23
FK 6207
35
72
17
265
3,700
8,902
7,819
2.7
0.34
FK 6207-2RS
35
72
17
265
1,900
8,902
7,819
2.7
0.34
FK 6208
40
80
18
267
3,700
8,902
7,752
2.7
0.45
FK 6208-2RS
40
80
18
267
1,900
8,902
7,752
2.7
0.45
FK 6304-2RS
20
52
15
104
2,800
7,448
5,146
1.5
0.17
All specifications for series FK 2RS (with seals) and series FK (without seals)
The specified nominal torque is based on sufficient stiffness of mating parts.
Rotation speed n for series FK (without seals) = assembly unit’s inherent speed.
Rotation speed n for series FK 2RS (with seals) = speed difference of mating parts.
