By Peter C Bell BSc (eds.)
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Extra resources for Mechanical Power Transmission
Ideally both belts should be arranged in the same straight line, but if needed one or both may be at an angle up to 30°. 5 kW (10 hp), this varyspeed arrangement is an economical method of obtaining speed variation ratios up to 7: I, and within its power and speed range the field of application is practically unlimited. Enclosed variable-speed units The devices so far examined are 'open type' assemblies which in certain instances, depending on the nature of the machine and/or operation, may not be convenient.
They are generally used for power applications and the majority are of commercial quality. 5 module (16 DP) are not used in the low power applications considered in this chapter. · Fine pitch gears. 075 module (350 DP). The majority of precision and instrument gearing is fine pitch. Figure 1 shows a variety of fine pitch gears. 45 Quality classification. (1) Commercial gears. This is the least precise gear group; applications are broad and varied, being largely in consumer products and industrial equipment.
Fig. 3. Sectional arrangement of multiple ratio step gearbox (courtesy Varatio Ltd). a markedly higher speed range than that required not only involves higher capital cost, but probably also has an appreciably shorter service life. One should therefore select equipment that has a lowest possible speed ratio compatible with drive requirements. The variable pitch pulley assembly consists of two conefaced discs, one fixed the other sliding, which are combined to form a V-groove pulley. The sliding cone is held in position by a tensioned spring which maintains constant driving pressure on the V-belt.
Mechanical Power Transmission by Peter C Bell BSc (eds.)