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- Cross-drive_steering_transmission abstract "A cross-drive steering transmission is a transmission which is used in tracked vehicles to allow precise and energy efficient steering.It consists of the following main parts: Two identical single-stage planetary gearings a differential a hydraulic pump connected to the engine (similar to an oil pump of cars) a hydraulic motor powered by the hydraulic pump hydraulic control valvesA steering transmission combines the two functions needed for a tracked vehicle transmission: a transmission to couple the relatively constant engine speed to varying road speeds and a steering gearbox to drive the two output shafts (and so the tracks) at different speeds, thus steering the vehicle.Cross-drive transmissions developed after WWII, at a time when tanks were growing larger and heavier. A growing problem with earlier gearboxes had been the amount of heat dissipated in the brakes used for steering. As tanks grew heavier, a more efficient system was required not just for efficiency (i.e. more available power from the same engine) but also to reduce the wasted power having to be disposed of through heat and wear in the steering brakes.Cross-drive transmissions were developed from the earlier controlled-differential steering gearboxes. Their innovation was to cross-couple the two sides, so that excess power from the slow side of the gearbox could be supplied to the faster side. This reduced the power to be dissipated by braking and it increased the power available to drive the fast track. Implementing this was difficult for most transmissions as it required a varying gear ratio between the sides. Most gearboxes simply offered a single ratio, through fixed gears and clutches, which restricted steering to a single radius.The particular innovation of the cross-drive, over earlier attempts, was to use a torque converter in the cross shaft. This allowed a continuously variable ratio between the two sides and so more precise steering. Torque converters are also easier to make for the high torques required in tank design, saving weight and cost.Cross-drive transmissions also improved the drivability of the manual transmissions then in use. Manual transmissions were heavy and tiring to drive, requiring skill and strength from the driver, and also frequent adjustments as the clutch plates wore. The pre-selector gearbox had been used to simplify the driving task, but at the cost of mechanical complexity. The cross-drive transmissions offered a mechanically-actuated self-changing gearbox, where the ratio selection could be either manual, automatic, or by pre-selection.The construction of these transmissions also integrated the transmission and steering gearbox functions into a single casing. This gave reduced overall weight and volume, and reduced servicing times. A related development at this time was the 'power pack' concept, where engine and transmission could be removed as a single unit. As size and complexity increased, fitter time became short but mechanical handling through mobile cranes became available in the field. It was now quicker and simpler to exchange one large unit than to dismantle and re-assemble more connections to remove a smaller component.".
- Cross-drive_steering_transmission thumbnail M47_tank_at_the_Harel_Memorial,_close-up_2.jpg?width=300.
- Cross-drive_steering_transmission wikiPageID "20417301".
- Cross-drive_steering_transmission wikiPageLength "5484".
- Cross-drive_steering_transmission wikiPageOutDegree "20".
- Cross-drive_steering_transmission wikiPageRevisionID "600369447".
- Cross-drive_steering_transmission wikiPageWikiLink Category:Automotive_transmission_technologies.
- Cross-drive_steering_transmission wikiPageWikiLink Continuous_track.
- Cross-drive_steering_transmission wikiPageWikiLink Differential_(mechanical_device).
- Cross-drive_steering_transmission wikiPageWikiLink Epicyclic_gearing.
- Cross-drive_steering_transmission wikiPageWikiLink FV434.
- Cross-drive_steering_transmission wikiPageWikiLink Hydraulic_motor.
- Cross-drive_steering_transmission wikiPageWikiLink Hydraulic_pump.
- Cross-drive_steering_transmission wikiPageWikiLink M1_Abrams.
- Cross-drive_steering_transmission wikiPageWikiLink MBT-70.
- Cross-drive_steering_transmission wikiPageWikiLink Machinist.
- Cross-drive_steering_transmission wikiPageWikiLink Main_battle_tank.
- Cross-drive_steering_transmission wikiPageWikiLink Powerpack_(drivetrain).
- Cross-drive_steering_transmission wikiPageWikiLink Preselector_gearbox.
- Cross-drive_steering_transmission wikiPageWikiLink Steering_gearbox_(AFV).
- Cross-drive_steering_transmission wikiPageWikiLink Torque_converter.
- Cross-drive_steering_transmission wikiPageWikiLink Transmission_(mechanics).
- Cross-drive_steering_transmission wikiPageWikiLink File:M47_tank_at_the_Harel_Memorial,_close-up_2.jpg.
- Cross-drive_steering_transmission wikiPageWikiLinkText "Cross Drive Transmission".
- Cross-drive_steering_transmission wikiPageWikiLinkText "cross drive transmission".
- Cross-drive_steering_transmission wikiPageWikiLinkText "cross-drive steering transmission".
- Cross-drive_steering_transmission wikiPageWikiLinkText "cross-drive".
- Cross-drive_steering_transmission group "note".
- Cross-drive_steering_transmission liststyle "lower-roman".
- Cross-drive_steering_transmission wikiPageUsesTemplate Template:Reflist.
- Cross-drive_steering_transmission subject Category:Automotive_transmission_technologies.
- Cross-drive_steering_transmission hypernym Transmission.
- Cross-drive_steering_transmission type Automobile.
- Cross-drive_steering_transmission type Technology.
- Cross-drive_steering_transmission comment "A cross-drive steering transmission is a transmission which is used in tracked vehicles to allow precise and energy efficient steering.It consists of the following main parts: Two identical single-stage planetary gearings a differential a hydraulic pump connected to the engine (similar to an oil pump of cars) a hydraulic motor powered by the hydraulic pump hydraulic control valvesA steering transmission combines the two functions needed for a tracked vehicle transmission: a transmission to couple the relatively constant engine speed to varying road speeds and a steering gearbox to drive the two output shafts (and so the tracks) at different speeds, thus steering the vehicle.Cross-drive transmissions developed after WWII, at a time when tanks were growing larger and heavier. ".
- Cross-drive_steering_transmission label "Cross-drive steering transmission".
- Cross-drive_steering_transmission sameAs Q332638.
- Cross-drive_steering_transmission sameAs Überlagerungslenkgetriebe.
- Cross-drive_steering_transmission sameAs m.04zzjws.
- Cross-drive_steering_transmission sameAs Q332638.
- Cross-drive_steering_transmission wasDerivedFrom Cross-drive_steering_transmission?oldid=600369447.
- Cross-drive_steering_transmission depiction M47_tank_at_the_Harel_Memorial,_close-up_2.jpg.
- Cross-drive_steering_transmission isPrimaryTopicOf Cross-drive_steering_transmission.