Gears {transmission}| can exchange power for distance or distance for power. Engines have highest power at 3000 to 4000 revolutions per minute.
Transmissions {automatic transmission}| can shift automatically after reaching specific speeds. In park, wheels lock. In neutral, automatic clutch does not engage. Forward gears can be low, drive 1, drive 2, drive 3, and overdrive. Reverse gear is the same as low gear but goes backward.
Devices {clutch}| can engage and disengage transmissions. A foot pedal connected to a spring presses discs {clutch plate} against a crankshaft extension that also has plates. Pedal depression overcomes spring, and plates move apart. Automatic transmissions have a fluid clutch, inside transmission.
Drive shaft goes to bevel gears {differential, transmission}|, which can have different ratios as wheels turn corners, to prevent tire squealing and control loss. The five bevel gears are: one for axle halves, one on drive shaft end, one large free spinning gear touching other gears, and one gear parallel to axle and attached to large gear and axle gears. Gear parallel to axle is stationary when moving straight-ahead but turns while turning, so one half-axle can rotate more than other half-axle. Differentials {limited slip differential} can allow only some turning and then disengage.
Transmissions {manual transmission}| can have gears on drive shaft and gears on engine shaft. When clutch is in, drive-shaft gears can slide over engine-shaft gears to select power-distance ratio, which is close to 1:1 for first gear and 1:4 for highest gear.
Transmissions can have a gear {overdrive}| with high ratio, to allow better gas mileage at higher speeds.
Frame rods {tie rod}| can transmit tension. Tie rods transmit motion to front axles of front-wheel-drive automobiles.
Automatic transmissions have barriers {stator, barrier} that point fluid at output rotor to increase torque {torque converter}| but decrease rotation and add heat.
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Date Modified: 2022.0225