![]() Trailer Hitch: The connector piece used to tow a trailer behind a vehicle. Travel Trailer: A non-motorized compact mobile home that can be towed behind a vehicle. Payload Capacity: The maximum amount of cargo weight that can be added to a vehicle. GVWR: The safe weight maximum a vehicle can operate with, including payload. Related RV Termsįor related RV terminology, please reference the RV definitions below: If you are looking for an online tool to calculate your Final Drive ratio, you can find one here. This means the pinion must rotate three times to make the ring gear rotate once, which in turn rotates the tire once. The straightforward way to calculate the Final Drive Ratio is to divide the number of teeth on the ring gear by the number of teeth on the pinion gear.įor example, if the ring gear has 30 teeth and the pinion has 10, take the number 30 and divide by 10 to get the ratio of 3:1. Since torque is what helps the vehicle accelerate, a higher final drive ratio will offer better acceleration. The reason a higher ratio will help accelerate a car faster is because the engine can spin up faster and creating more leverage to turn the wheels. This means:Ī higher final drive ratio will result in more torque at the wheels but a lower top speed. Generally, a lower final drive ratio will lead to less torque at the wheels but a higher top speed. These gear sets are better suited for towing and hauling heavy loads. Therefore, less acceleration is required to move your load from a dead stop. The lower gear sets provide more low speed torque, or towing power, at the rear wheels. See Above.Īn axle ratio that is higher in the number of drive shaft rotations for every tire rotation is more suitable for towing. Lower axle ratios are not suitable for towing and hauling heavy loads. This level of axle ratios result in lower rpms, which mean better fuel economy for your vehicle. To achieve maximum fuel economy you want an axle ratio lower in the number of drive shaft rotations (pinion gear) for every tire rotation (ring gear). With Mark Polkġ) reduce the speed at the vehicle’s wheels Ģ) divide the torque between the two wheels. The gears used in the final drive (axle/differential) serve a few different, but important purposes. The Final Drive Ratio is also called the “Axle Ratio”. The pinion gear is the small gear at the end of the drive shaft connecting to the larger ring gear, which rotates the drive axle. These gears reduce the speed of the transmission’s gears at the axle and divide that power (torque) between the two driving wheels. Both the pinion gear and the ring gear affect the performance of a vehicle. There are two gears mounted on the driving axle of a vehicle: (1) the pinion gear, and (2) the ring gear. Higher ratios result in better acceleration.To calculate the Final Drive Ratio, divide the number of teeth on the ring gear by the number of teeth on the pinion gear.Affects acceleration, towing capacity and fuel economy of a vehicle.For example, “first gear” may have a ratio of approximately 3:1, while “fifth gear” may have a ratio of 0.85:1, utilizing the transmission’s output to control vehicular speed. Gear ratios are especially important for complex systems, like the gears in your car. That results in a total reduction of the system of 3.45. So for every turn gear 1 makes, gear 3 makes about 0.29 turns (0.57/2). The gear ratio between gear 2 and gear 3 is then 1:2, so for every revolution gear 2 makes, gear 3 makes half a turn. For example, let’s say there’s a gear at the end with 42 teeth. If you add more gears to a system, the gear ratio can continue to develop. In a practical sense, for every one time the 12-tooth gear turns, the 21-tooth gear will turn 0.57 times, which is (1/1.75). It may also apply to two sprockets connected by the same chain or pulleys connected by a drive belt.įor example, if one gear has 21 teeth, and the gear next to it has 12 teeth, you could write that gear ratio as 12:21 or, simplified, 1:1.75. The gear ratio is the ratio between the quantity of teeth on two gears that are turning together. The magic of gears lies in the transference of directional power, and for that to occur as desired, gears need a proper “gear ratio” in relation to one another. It is to have a four-speed transmission and the goal. Gears are some of the most important simple machines we use in the modern world, even with the advances in technology we’ve seen unfold in the past decade. A vehicle powered by an electric motor has a mass M (car + driver) of 600 kg and a wheel radius of 0.25 m.
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