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Logan Multiple Disc Clutches and Brakes

Simple, Compact, High Torque Design

Logan Fluid or Air actuated clutches, brakes, and clutch-brake combinations are used in a wide variety of Machine Tool, Industrial, Marine, Municipal, Mining and Off-Highway applications. Our attention to quality and service, along with the ability to modify standard units to meet specific customer needs, has lead to the success and growth of Logan Clutch Corporation.

The Standard Logan product line is described on this web page. It consists of three series of clutches and brakes with design features that are beneficial to their installation, operation and maintenance. Each series has model sizes with friction discs ranging in diameter from 2.5 inches (64 mm) to 12 inches (305 mm). All models can be furnished with standard lug or gear toothed friction discs.

Clutch Applications

When used as a clutch, the hub is keyed to the drive shaft. The drive cup is attached to a bearing mounted gear, sprocket or sheave, which can freewheel about the same shaft. The hub or the drive cup can be the driving or driven member.

The above arrangement is used to transmit torque between two parallel shafts. When torque must be transmitted between in-line shafts, one half of a flexible coupling is used to connect the bearing mounted drive cup to the other shaft.

Brake Applications

When S and P units are used as a brake, their hub is keyed to the shaft to be stopped. The drive cup is held stationary by the drives supporting frame. The R series allows either its hub or drive cup to be the stationary member. An external cylinder port is provided when the hub is held stationary.

Operation

Pressurizing the cylinder with fluid or air forces the piston to clamp and lock the friction and separator discs. Torque is transmitted through the interfaces between hub and separator disc splines, separator and friction discs, and friction disc tangs and drive cup slots. When pressure is removed, the release springs separate the separator discs and maintain a running clearance between separator and friction discs.

Lubrication

R and S Series:

Logan R and S Series Clutches and brakes are designed primarily for R and S Series: wet operation within gear boxes and transmissions. They can be partially submerged in an oil sump or an oil splash or spray can be directed on the outside diameter of the disc patch. This wet operation aids in dissipating the thermal energy generated at the disc friction interfaces.

S series units require lubrication of the cylinder and thrust bearings. Usually, the oil splash or spray directed at the disc pack provides sufficient lubrication. Lube ports are available for specific applications.

Coolant

R and S Series: 

In demanding applications with multiple engagements within a short period of time; or applications with very high inertia; the R and S clutch can be provided with oil passages for lubrication and intensive coolant flow through the shaft. This requires that the clutch be mounted on a shaft with a center drilled hole for coolant supply and a rotary coolant inducer. The coolant carries away the heat generated by multiple engagements or slow engagement. 

P Series:

P series clutch bearings are greased and sealed and do not require external lubrication. Torque ratings are based on dry operating conditions.

Convenient to Maintain

Logan Clutches and brakes do not require linkages, levers, or adjusting collars. At drive system service time, in-stock disc pack kits, seal kits, and bearing repair kits, along with factory installation data sheets make maintenance quick and easy. Factory reconditioning is also available.

Standard Features
• Maximum Torque / Minimum Envelope
• Hydraulic or Pneumatic Actuation Wet or Dry Operation
• Wet or Dry Operation
• Fast Engagement / Quick Release
• Minimal Freewheeling Drag
• Compact Design
• Custom Bore Diameters / Keyways

Logan Clutch Components