Couplings clutch type

The synchronous clutch coupling of the type MS-85-S is mounted between the gas turbine (power turbine only) and the alternator. In this case the MS-type coupling is provided with the S-feature, which means that the coupling will behave like a rigid coupling when engaged. 

The primary advantage of this type of clutch is its ability to transmit full torsional force without any possibility of slip. Its major disadvantage is that the two shafts are instantaneously coupled when the clutch engages. This results in abrupt starts, which may cause excessive torsional shock loads that damage drive-train components. Figure 59.21 shows a positive clutch. 

The torque converter is a type of fluid coupling device that hydraulically connects the engine to the transmission—analogous to a mechanical clutch. Used in conjunction with the torque converter is a stator, which essentially assists at low engine speeds, thus increasing acceleration. The vanes inside the converter alter the shape of the fluid path into the stator. The stator captures the kinetic energy of the transmission to enhance torque multiplication. This process will not only increase heat, but also increase shear of the transmission fluid. In addition to torque conversion, at every shift event, clutch packs generate heat, which must be carried away by the transmission fluid. 

This paper examines the brake options for use on friction hoists, single drum hoists and double drum clutched hoists taking into consideration that some of the hoists make use of roller type bearings and others make use of sleeve type white metal bearings. Factors such as drum float coupled with shaft float as well as disc deflection, will be discussed for double drum hoist applications. 

It is also possible to provide each product of the synchronous clutch couplings with very distinctive features. Figure P-57 gives some examples of combination possibilities of different features available for two of the designs. Type MS and Type HS. 

Based on the foregoing, the designation of a particular type of synchronous clutch coupling gives the following information ... 

Synchronous clutch coupling (see Figs. P-58 and P-59) of the type HS-85 (the information soxuee s model designation) can be installed in a power plant between the gas turbine and alternator. 

Free-standing synchronous clutch couplings type MS-... -E (this information source s model designations). Encased synchronous clutch couplings (see Fig. P-65) have been developed for installations where complete isolation of the driving machine is required for on-site maintenance while the driven machine continues to rotate. Typical applications for the encased clutches are fan drives with two driving machines. 

Exploded view of the type MS-85-S Synchrortous Clutch Coupling... 

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