Gear train drive

Figure 10.22 Sketch showing the principle of operation of the Sentmanat extensional rheometer (SER), which is designed to be used as a fixture in a standard rotational melt rheometer. One of two cylinders is driven directly by the rheometer motor, while a gear train drives the slave drum.The thin, rectangular sample is clamped at its ends to the cylinders.The torque on the drive shaft is proportional to the tensile stress in the sample. Sketch courtesy of Jen Tiang.

Functioning. The firming vane drives a high speed (coupling) shaft and, thru a reduction gear train, a slow speed shaft. 

The arming vane may drive a gear train which, after a definite interval, removes safety blocks or aligns the detonator with the next element in the explosive train. Standard arming vanes have blade pitches of 30°, 60°or 90°, but there are also "special" vane assemblies with different blade pitches (Ref 51a, p 5-38)... 

Nacelle - The cover for the gear box, drive train, generator, and other components of a wind turbine. 

FIGURE 10-14 The gear train is used to transfer rotary motion. It can change the speed or torciue of the motion. Each gear turns in the opposite direction of its drive gear. You can see gear trains at work on bicycles. 

The stirrers can be driven individually by small electric motors, or power can be taken from a single large motor by means of belts, gear trains, or flexible drives as required. The optimum speed of rotation varies with the... 

Controlled load lowering means lowering a load by means of a mechanical hoist drum device that allows a hoisted load to be lowered with maximum control using the gear train or hydraulic components of the hoist mechanism. Controlled load lowering requires the use of the hoist drive motor, rather than the load hoist brake, to lower the load. 

Subsystem 1.5 Ton Crane Micro-Drive System During micro-drive operations (slow speed), an electric clutch is used to engage the micro motor and associated gear train. This allows smooth, minute movements of the hoist during critical operations. 

Simple apparatus may be connected directly to the shaft of a motor or a turbine. More often, there will be some form of transmission device between the driver and the load. This device may be a coupling, a gear train, a belt, or a chain. The following discussion will not cover variable-speed drives. Most of the safety considerations for the fixed-ratio devices treated below apply to all moving and rotary equipment. 

Making one gear in a gear train or one link in a linear drive mechanism an energy absorber can use the same approach as the belt. The viscoelastic damping is a valuable tool for the designer to handle impulse loading that is undesirable and potentially destructive to the product. 

---