Gear units Example of Tooth Quality Effect: Tooth quality is an important factor when calculating gear drives. Apart from the benefits of improved accuracy, better tooth quality also increases the torque / power capacity of the system for the same given design parameters (i.e. same rack section dimensions, material and surface heat treatment). The following example system shows the direct coloration between tooth quality and system power capacity: Tooth Form : Straight Spur Module Size : 4.0 Pinion Teeth : 25 Pinion Speed : 50 rpm Material : C45 Steel Tooth Finish : Ind. Hard Lubrication : Grease Alternatively, better tooth quality also increases the service life of the system for the same given design parameters (i.e. same rack section dimensions, material and surface heat treatment) and loadings. The following example system shows the direct coloration between tooth quality and system service life: Tooth Form : Straight Spur Module Size : 4.0 Pinion Teeth : 25 Pinion Speed : 50 rpm Material : C45 Steel Tooth Finish : Ind. Hard Lubrication : Grease Tooth Quality Max Power Life (hours) Q9 2.0 kW 15,000 Q8 2.0 kW 20,000 Q7 2.0 kW 24,000 Q6 2.0 kW 30,000 Tooth Quality Max Power Life (hours) Q9 1.5 kW 20,000 Q8 2.0 kW 20,000 Q7 2.4 kW 20,000 Q6 3.0 kW 20,000 Worms and Worm Wheels worm 7 .0 FAX: 01827 253390 www.apex-trans.co.uk TEL: 01827 253340 sales@apex-trans.co.uk DIN Quality 1 2 3 4 5 6 7 8 9 10 11 12 Manufacturing Method Punched, Pressed, Injection Moulded Planed, Milled, Shaped Shaved Ground Circumferential Speed < 3 m/s 3 – 6 m/s 6 – 20 m/s > 20 m/s Typical Applications Agricultural Machines Lifting Devices, Conveyors, Office Machinery Construction Machinery Apparatus Construction Machine Tool Manufacturing Internal Combustion Engines Turbines, Measuring Equipment Testing Equipment Application Guide 25