03-07-2012, 01:07 PM
SEMINAR ON CLUTCH
Clutch is a mechanism which enables the rotary motion of one shaft to be transmitted , when desired , to a shaft the axis of which is coincident with that of the first or we can say that clutches are the intermediate between the driving and the driven shaft . It is mainly used for connecting and disconnecting as and when required according to the driving conditions of the machines and any automobiles without stopping engine. There are some technical disadvantages in mechnical operated clutches. So magnetic clutches are invented. In these type of clutches magnetic pull of electromagnets are used to support the mechnical arrangement.
LITERATURE REVIEW
Clutch is a mechanism which enables the rotary motion of one shaft to be transmitted , when desired , to a shaft the axis of which is coincident with that of the first or we can say that clutches are the intermediate between the driving and the driven shaft .
A cone clutch serves the same purpose as a disk or plate clutch. However, instead of mating two spinning disks, the cone clutch uses two conical surfaces to transmit torque by friction. The cone clutch transfers a higher torque than plate or disk clutches of the same size due to the wedging action and increased surface area. Cone clutches are generally now only used in low peripheral speed applications although they were once common in automobiles and other combustion engine transmissions. They are usually now confined to very specialist transmissions in racing, rallying, or in extreme off-road vehicles, although they are common in power boats .
SINGLE PLATE CLUTCH
A simplified sketch of a single plate clutch is given in fig friction plate is held between the flywheel and the pressure plate there are spring arranged circumferentially which provide axial force to keep the clutch in engaged position the friction plate is mounted on a hub which is splinted from and is thus free to slide over the gear box shaft friction facing is attached to the friction plate on both sides to provide two annular friction surfaces for the transmission of power a pedal is provided to pull the pressure plate against the spring force whenever it is required to be disengaged ordinarily it remains in engaged position
MULTIPLE CLUTCH
The multiple clutch is an extension of single plate type where the number of frictional and the metal plate is increased . the increased in the number of friction surfaces obviously increased capacity of the clutch to transmitted torque .the size remaining fixed . alternately the over all diameter of the clutch is reduced for the same torque transmission as a single plate clutch . this type of clutch is therefore used in some heavy transported vehicle and racing car where high torque is transmitted . beside this finds application in case of scoters and motorcycle where space available is limited .
CENTRIFUGAL CLUTCH
A centrifugal clutch is a clutch that uses centrifugal force to connect two concentric shafts, with the driving shaft nested inside the driven shaft.
When the engine reaches a certain RPM, the clutch activates, working almost like a continuously variable transmission. As the load increases the rpm drops, disengaging the clutch, letting the rpm rise again and reengaging the clutch. If tuned properly, the clutch will tend to keep the engine at or near the torque peak of the engine. This results in a fair bit of waste heat, but over a broad range of speeds it is much more useful than a direct drive in many applications
CONCLUSION
Detailed description about the clutch is given in the report.
Literature survey on clutch has been carried out
Work to be carried on clutch been clearly defined.
Procedural steps to carry out the investigation are given in the methodology chapter.