Pinion shafts

If an intermediate gear is necessary, some manufacturers use single helical gears provided with thrust collars on the pinion shaft, as shown in Figures 4-32 and 4-33. The thrust collars not only neutralize the... 

The inerease in eost and the reduetion of effieieney thus eaused is only a fraetion of that ineurred when a large-diameter, high-veloeity thrust bearing must be mounted on a single-helieal pinion shaft. 

Another common type of compressor is manufactured in an integrally geared configuration. It is basically an overhung style machine mounted on a gear box and uses the gear pinion shaft extension to mount an... 

The pinion shafts are typically a cantilever-type design that has an enclosed impeller on one end and a tilting-pad bearing on the other. The pinion gear is between these two components. The number of impeller-pinions (i.e. stages) varies with the application and the original equipment vendor. However, all bullgear compressors contain multiple pinions that operate in series. 

The pinion shafts in this type of compressor are inside the housing. As a result, it is difficult to obtain radial measurements directly. A cross-sectional drawing of the compressor is required to determine the best location and orientation for the measurement points. 

Hoist gear reduction assembly Main pinion shaft Intermediate gear and pinion assemblies... 

Sometimes the frame is mounted on a sub-frame together with the drive motor, and where necessary a back-drive system, to control the gearbox pinion shaft, which will in turn control the conveyor-to-bowl differential speed. The back-drive system will be described later, but for the present it suffices to say that it is essentially a braking motor or similar device coupled to the gearbox pinion shaft. The main motor is offset from the bowl and drives the bowl by means of a set of V-belts. The back-drive can also be offset, in which case it would be connected with a timing belt. The timing belt is to facilitate more accurate speed control. However the back-drive system can also be mounted direct in line with the pinion of the gearbox. 

The back-drive system is a means of controlling the speed of the gearbox pinion shaft (and thereby the conveyor differential speed) using, for instance, a motor or a brake. This could be offset from the gearbox shaft, in the same manner as the main drive, and connected by a belt. This belt would be a timing belt because of the accurate control required. Normally the back-drive is connected directly and in line with the gearbox pinion. 

When used as a decanter gearbox, the input shaft, called the pinion shaft in decanter terminology, is held stationary or is braked to a speed below bowl speed. The body of the gearbox, holding the outer gearwheel, rotates at bowl speed. In consequence, the output shaft, which engages the conveyor, rotates at a slightly faster speed than the bowl. 

It is particularly necessary to measure the speed of rotation of the decanter bo wl and the gearbox pinion shaft. Occasionally a tachometer will be built into the braking device. More generally, bowl and pinion speeds are measured by proximity probes, acting on a protuberance or castellation, on a spigot, hub or shaft. 

Conveyor torque today is an essential part of decanter control. However, direct reading of conveyor torque is very difficult to achieve. Even direct reading of pinion torque is difficult, but could be done using strain gauges on the pinion shaft. However, the most usual method is to use a calibration of the braking device. The control device for the brake will give a read-out, on request, of the braking torque. 

All the controllers are Important, but the most important controller for the process is the one controlling the gearbox pinion shaft brake. This PLC... 

The housing for a main bearing The small shaft of the gearbox to which is attached a torque arm or a back-drive motor or brake. Sometimes referred to as the sun wheel shaft or input shaft The torque on the pinion shaft The distance between consecutive sections of the conveyor flight... 

Synonymous with pinion shaft The average velocity of a fluid through a bed of particles, averaged over the whole area of the bed... 

A replaceable assembly fixed to the conveyor flight lips to combat erosion Tangential force times distance An arm which can be mounted on a gearbox pinion shaft, which is kept at rest by a torque overload mechanism. The mechanism releases the arm when an overload occurs Three separate flights on a conveyor hub Another name for an eccentric dam The upper half of a casing, usually hinged to allow access to the bowl... 

Fig. 62 and 63 show a rack and pinion drive for the die-holder. The die-carrier moves on two rollers running on rails which are fixed in the counterplaten and on the run-out table. The extension piece of the die-carrier consists of a tube, the top of which is cut open the end of this tube is provided with a pinion shaft which is rotated by means of a hand-wheel. The racks of the double-sided drive are fixed on the run-out table. 

FIG. P-64 Automatic turning gear clutch type MS-8-T installed In gearbox between turning gear and pinion shaft. (Source MAAG Gear Company.)... 

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