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- Crawl_ratio abstract "Crawl ratio is a term used in the automotive world to describe the highest gear ratio that a vehicle is capable of. Note that gear ratio, also known as speed ratio, of a gear train is defined as the ratio of the angular velocity of the input gear to the angular velocity of the output gear, and thus a higher gear ratio implies a larger speed reduction, i.e. the input speed is reduced more at the output. The highest gear ratio is obtained at either first gear or reverse gear, but only first gear is typically taken into consideration while talking about crawl ratio. A potentially confusing terminology is that although a better crawl ratio is achieved by a higher gear ratio, it is common to refer to a better crawl ratio as “lower crawl ratio” rather than “higher crawl ratio” as it is obtained by lowering the engine speed more.The crawl ratio is aptly named because when a vehicle is driven using the lowest gear (i.e. first gear), it moves the slowest (i.e. crawl speed) at a given engine rpm, and thus produces the highest output torque (i.e. crawl torque) at the road wheels due to conservation of power.Since crawl ratio of a vehicle represents the total reduction of the engine speed until the road wheels, it is determined by combining the contributions of different elements on the entire drive train, including transmission and differential, both of which typically introduce a certain amount of speed reduction.Since a lower crawl ratio (higher gear ratio) implies a larger output torque on the road wheels, it is desirable for vehicles that need to pull large loads, climb steep inclines, or drive over obstacles on the road or terrain, such as rocks, which is sometimes referred to as crawling over the rocks. Therefore, crawl ratios are most often discussed for large SUVs, trucks and off-road vehicles.Note that tire size (or dimensions of the road wheels) does not affect the gear ratio of a vehicle, and thus using a different size tire on the same vehicle does not affect the torque on the road wheels or the crawl ratio. However, for a given engine speed and a gear ratio, the output force on the road wheels decreases as the tire size increases. A lower force in turn decreases the acceleration of rotating wheels. Therefore, the smallest tires that are still big enough to drive over obstacles perform better for a given crawl ratio.Crawl ratio can vary greatly among vehicles. Crawl ratios in the 60's (i.e. a gear ratio of 60:1) are quite capable; in the 80's, very respectable; in the 110's, impressive; and anything beyond the 130's is usually considered as the point of diminishing returns.".
- Crawl_ratio wikiPageID "6286739".
- Crawl_ratio wikiPageLength "2868".
- Crawl_ratio wikiPageOutDegree "12".
- Crawl_ratio wikiPageRevisionID "631605066".
- Crawl_ratio wikiPageWikiLink Category:Engineering_ratios.
- Crawl_ratio wikiPageWikiLink Category:Mechanical_power_transmission.
- Crawl_ratio wikiPageWikiLink Differential_(mechanical_device).
- Crawl_ratio wikiPageWikiLink Drivetrain.
- Crawl_ratio wikiPageWikiLink Gear_train.
- Crawl_ratio wikiPageWikiLink Off-road_vehicle.
- Crawl_ratio wikiPageWikiLink Revolutions_per_minute.
- Crawl_ratio wikiPageWikiLink Sport_utility_vehicle.
- Crawl_ratio wikiPageWikiLink Torque.
- Crawl_ratio wikiPageWikiLink Transmission_(mechanics).
- Crawl_ratio wikiPageWikiLink Truck.
- Crawl_ratio wikiPageWikiLink Wheel.
- Crawl_ratio wikiPageWikiLinkText "crawl ratio".
- Crawl_ratio wikiPageUsesTemplate Template:Unreferenced.
- Crawl_ratio subject Category:Engineering_ratios.
- Crawl_ratio subject Category:Mechanical_power_transmission.
- Crawl_ratio hypernym Term.
- Crawl_ratio type Concept.
- Crawl_ratio type Ratio.
- Crawl_ratio comment "Crawl ratio is a term used in the automotive world to describe the highest gear ratio that a vehicle is capable of. Note that gear ratio, also known as speed ratio, of a gear train is defined as the ratio of the angular velocity of the input gear to the angular velocity of the output gear, and thus a higher gear ratio implies a larger speed reduction, i.e. the input speed is reduced more at the output.".
- Crawl_ratio label "Crawl ratio".
- Crawl_ratio sameAs Q5182955.
- Crawl_ratio sameAs m.0f_jlp.
- Crawl_ratio sameAs Q5182955.
- Crawl_ratio wasDerivedFrom Crawl_ratio?oldid=631605066.
- Crawl_ratio isPrimaryTopicOf Crawl_ratio.