Traditional outdoor power equipment is typically driven by an engine. Engines normally operate in one direction, and that is usually counterclockwise. Electromagnetic clutches are often used for several reasons in those applications and for many years they have been uni-directional clutches. So, what if my new application requires reverse operation as well? This is possible in hybrid drives where an electric motor might be coupled for reverse rotation.

Uni-directional clutches typically utilize leaf springs. This limits full torque when operating in the reverse direction of rotation because the leaf springs are then in compression instead of tension and they will want to buckle. Excess load can weaken & eventually break the springs.

For diesel engine applications, we have to consider reverse pulsations.  In this case, we use bi-directional springs in the clutch to absorb those pulsations, whereas normal leaf springs would buckle.

For bi-directional clutches, the springs need to be designed differently or two sets of springs need to be used. Ogura MMC clutches are made to operate in either direction. They range in torque from 200 to 1500 lbft. A variety of bore sizes and pulley options are available. Most larger clutches operate via an inline drive and the clutch hub is fitted with a bolt pattern that matches common driveshaft couplings.

Benefits you will see when using an Ogura electromagnetic clutch:

• Reduced engine load during cold weather starts
• Increased operational life of pumps and other driven equipment
• Fuel and energy savings
• Safety and convenience (remote starting)

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