Completely Enclosed for Continuous Operation

Marland Products The Need for CECON Clutches Since 1931, Marland has been producing backstops, clutches and clutch couplings. Marland products are based on a oneway clutch design, utilizing the principle of cylindrical rollers on inclined cam planes. The Marland principle of rollers on inclined cam planes has proven its dependability for over 70 years in worldwide installations ranging from food processing plants to equipment used in steel mills and heavy mining industries. Proving the inherently long-life Marland design, the first two Marland clutch units installed in February, 1931, operated...

Operating Details CECON Clutches consist of a completely enclosed housing with provisions for supporting a Marland freewheeling clutch between two shafts, each of which is separately supported. The input shaft is connected to the cam and the output shaft is connected to the outer race. The CECON shafts are then connected to driving and driven equipment through double engagement, self-aligning flexible couplings. During freewheeling, the outer race, as shown by the arrow in Illustration 2, is free to rotate with the output shaft. The cam and roller assembly connected to the input shaft remain...

Design Feature The basic clutch elements of cam, roller cage and outer race are similar items as employed for other Marland Clutches. In addition, CECON Clutches are designed to keep freewheeling clutch parts and bearings adequately lubricated. Housings are of rugged, cast construction with liberal cooling areas to permit dissipation of heat which may be generated during high speed freewheeling operation. The stationary housing also provides a large oil reservoir with many times the oil capacity of an ordinary freewheeling clutch. Provision is made against unnecessary churning of the oil. This...

Advantages of Marland Cylindrical Rollers on Flat Inclined Cam Surfaces Marland CECONs are a complex design that has been optimized to provide a longer operating life with less maintenance. Here are some of the major clutch components and their key design features: 1. Cam High Grade alloy steel, deep case hardening, precision machined • Selected for optimal strength and wear resistance • Heat treated to values which exceed competition, maximize peak torque capacities 2. Roller Assembly High Grade alloy steel, through hardened, precision ground • Designed to enhance load capacity • Eliminates...

Typical Applications Dual Drives For dual drive arrangements, CECON Clutches connected between the driven equipment and the power sources, provide for instantaneous changeover from one source of power to the other without delays for manually loosening, tightening or shifting standby drive connections. In Illustration 4, a large electric motor and steam turbine are connected to double shaft extensions of a continuously operating high speed pump through Marland CECON Clutches. The following operating modes exist: 1. Either the motor or the steam turbine may be used to drive the pump. Both motor...

Typical Applications Inching or Creep Drives A Marland CECON Clutch connected between a low speed drive and the normal operating speed drive for conveyors, steel strip mills, or other equipment, will permit operation at inching or creeping speed for inspection or servicing. Such drives are necessarily limited to one direction of rotation and cannot be reversible. CECON clutch allows automatic and instantaneous change-over from one drive to the other without complex controls. The application of a Marland CECON Clutch to provide inching speed for an inclined conveyor is shown in the Illustration...

Typical Applications Energy Recovery Systems Energy recovery in hydrocarbon processing plants is an important factor in the reduction of operating costs. Wherever a high pressure liquid flow is reduced to a lower pressure, hydraulic energy is wasted. By the application of a hydraulic turbine and a CECON clutch, most of this energy can be recovered. The hydraulic turbine is connected to the CECON Clutch input shaft, and the output shaft is connected to the double extended motor shaft or pump shaft. The motor is usually sized to carry the full pump load for those times, such as startup, when little...

Typical Applications Kiln Emergency Drive For some time the trend in the cement and other pyro-processing industries has been toward larger and more efficient kilns. Since these kilns operate 24 hours per day, month after month, it has been important to conserve power and avoid down time as much as possible. The high degree of efficiency in the mechanical power transmission that has evolved also means that the kiln can roll back due to the large off-center mass of material in the kiln when power failure occurs or at any time the main drive is shut down. Uncontrolled rollback carries the danger...

Special Applications High Speed Backstops Standard Marland backstops are recommended for use at low speeds, as on conveyor drive pulley shaft, instead of at motor speed or on other high speed shafts. However, there are many applications for backstops on equipment having only high speed shafts available. Examples of this type of application include motor or turbine driven pumps, compressors or blowers. When power failure or shutdown occurs, the common header for the air or fluid may cause reverse rotation of the equipment if check valves fail to shut off the reverse flow. During such reversals...

CECON Clutch Size Selection Selection of a Marland CECON Clutch requires the following information: 1. Nameplate horsepower of drive (motor, turbine, engine, etc.) RPM of driven shaft (freewheeling speed) Kind of machines to be connected (driving and driven) Direction of driving rotation when facing input end of CECON. Where the CECON Clutch shafts will not be on a horizontal plane, refer to the factory indicating angular position. For dual drive arrangements requiring a second CECON Clutch, similar information as outlined above applying to the alternate drive should be obtained to assure selection...