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Shaft couplings Oldham type shaft couplings
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RULAND OLDHAM TYPE SHAFT FLEXIBLE COUPLINGS

SIMPLE & ECONOMIC FOR SHAFTS 3 TO 30MM

Techdrives shaft couplings include the RULAND oldham type designs,  They combine performance and economy with a wide ex-stock range.  Torque range from 0.2 to 42mm and shaft sizes 3 to 30 mm.  Inertias are low and maximum speed is 4500 r/min.


Oldham couplings are a three piece design comprised of two aluminium hubs press fit onto a centre disc. Torque transmission is accomplished by mating the slots on the centre disc to the drive tenons on the hubs. During operation the centre disc slides on the tenons of each hub (which are orientated 90° apart) to transmit torque. While the couplings accommodate a small amount of angular and axial misalignment, they are especially useful in applications with parallel misalignment.


Ruland offers oldham couplings in set screw or clamp styles with bores ranging from 3 to 30mm with imperial dimensions available. Inch and metric hubs (set screw, clamp style, keyed, or keyless) are interchangeable and can be combined into a single coupling as long as they have the same outside diameter. Oldham coupling hubs are standard in black anodized aluminium for improved lubricity, increased life, and low inertia. Hubs are also available in stainless steel upon request for increased corrosion resistance.



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ruland oldham type shaft flexible couplings

Size

Rated torque Nm

Body
Dia mm

Max
bore mm

Nylon

Acetal

13

0

1

13

6

19

1

2

19

8

25

1

5

25

12

33

2

8

33

15

41

4

15

41

20

51


29

51

25

57


43

57

30

Performance

Temperature range -25 to + 60°C.

See the catalogue pages for more information

The replaceable centre disc is available in acetal for high torsional stiffness and zero-backlash, or nylon for shock absorption and noise reduction. The slots of the disc mate onto the tenons of the hub with a slight press fit to allow the coupling to operate with zero-backlash. In the event of disk wear or failure, the disc can be easily replaced and the oldham coupling's original performance restored. Discs with a centre hole are available upon request to allow full shaft penetration.


Ideal for many light duty industrial and motion control applications, oldham couplings have the ability to protect more expensive machinery components. For example the oldham coupling acts as a torque limiter during overload. When the disc fails, it breaks cleanly and does not allow any transmission of power. Oldham couplings also have the advantage of electrical isolation due to the non-conductive nature of the centre disc. This prevents electrical currents from being passed to delicate instruments which can cause inaccurate data readings or damage.

 

Type: Torsionally soft or moderately stiff with low or zero backlash, low cost.


Construction:  Aluminium alloy hubs with clamp or set screw connection.  Centre disc is nylon for torsional softness and low backlash, or acetal which is stiffer and backlash free.


Applications:  Light duty machinery that needs a simple low cost couplings that is easy to fit.