Produce radial thrust forces v Use tapered roller bearing to secure them in

Produce radial thrust forces v use tapered roller

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Produce radial & thrust forces v. Use tapered roller bearing to secure them in place c. Double Helical Gear i. Two helical gears sealed together ii. The orientation cancels out axial or thrust forces iii. Can run at higher speeds w/ less noise and virbration Herringbone gear = double helical gear that does NOT have the apex groove between the 2 gears - Can transmit heavy loads at very high rotational speeds - Suited for shock and vibration applications - Can handle Large horsepower requirements while still generating smooth operation Applications: enclosed gear boxes in power plants d. Internal Gears i. Teeth are located on the inner circumference of the gear, and usually mesh w/ a smaller pinion gear that has external teeth ii. The tooth profile can be either involute or helix iii. Used in applications where there is a space constraint iv. There’s no need for a idler because both gears rotate in the same direction e. Rack and pinion i. Is a type of spur gear that had an infinite diameter ii. Converts rotary motion to linear motion or vice versa iii. Used in apps that involve oscillation or reversing of direction
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Application: lathe, drill press, automobile steering 2. Intersecting shafts a. Straight Bevel Gears i. Teeth are cut on an angular and conical surface ii. The teeth are tapered in thickness w/ outer part being the widest iii. Transmit speed and torque at right angles b. Spiral Bevel gears i. The teeth are inclined at an angle to the face of the bevel ii. Have a higher load carrying capacity than straight BG c. Zerol Bevel Gears i. Have 0 degree spiral angles, high contact ratio, high efficiency d. Skew tooth gears i. Similar to spiral types BUT the teeth are NOT curved ii. Higher load carrying capacity iii. Used for large diameters 3. Skew shafts (transmit motion in non parallel/ intersecting planes) Pure rolling contact is NOT possible a. Cross-Helical Gears i. Limited to light loads w/ sliding action Applications: feed mechanisms on machine tools, oil pumps, and internal combustion engines b.
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