The eaton elocker is an electronic, selectable differential designed for drivers that need traction ondemand. Free pdf download two methods of lengthening the sensor life have been examined in this thesis. When tested with the wheels off the ground with torque applied toone wheel it will lock, but it is still possible for the differential actionto occur in use, albeit with considerable frictional losses, and. Differential lock free download as powerpoint presentation. Viscodrive gmbh, have developed an allnew differential system for the new bmw m3, the variable m differential lock. Now both sides of the differential are locked together.
The information included covers the differential carrier assembly, axle housing, axle shafts, shift system and specialdesigned parts kits and assemblies. In offroad conditions one or several wheels can lose traction. The basic parts of a differential is introduced first. Prototyping a system for truck differential lock control. A locking differential provides increased traction compared to a standard, or open differential by disallowing wheel speed differentiation between two wheels on the same axle under certain conditions. Utilizing a flyweight mechanism and selfenergizing clutch system, the eaton. When tested with the wheels off the ground with torque applied. Interlock leaves the truck pretty driveable, but you will.
The differential allows the torque to go to the wheels that are easiest to turn. To have simple differential locking system, the different. Drill a hole there all the way through it, and through the left drive gear on the other side. Eaton s mlocker mechanical locking differential provides drivers bestinclass traction without the need for pushbuttons, shift knobs or other intervention method. Mechanical internal pressure sensor differential lock request, pump runs. A very highfriction differential, such as the zf sliding pins andcams type, so that there is locking from very high internal friction. T is the torque supplied to each halfshaft, respectively. The differential gearbox is one, if we lock any one of the element in gearbox then whole gearbox will lock and the rear axle shafts will work as a single shaft. Kunihiko suzuki7 discussed a theory that a four wheel drive system of a vehicle has center differential between four wheels and rear wheels and a means for restraining or locking the center differential. To date, volkswagen is the only carmaker to utilise an electronically controlled.
A locking differential or locker is a variation on the standard automotive differential. The invention has for an object to provide a differential gearing which will normally transmit power to independent elements driven thereby with required diflerential effect, but which includes novel means operative, under certain conditions, to automatically lock the gearing whereby to cause the same to drive said independent elements as a. Thus the power is directly transmitted to the axle and hence to the wheels. Manufacturing of simple differential locking system international. Pdf in todays scenario, rear axle with differential lock arrangement is one of the key required parameter. Unless the air locker is activated, then the differential will remain in the open position, which is perfect for those who have rigs that double as a daily driver and an offroading beast.
You will still spin the tires with the least traction on each axle. Compatible with most advanced antilock brake systems. Us2495016a selflocking and unlocking differential gear. An industrial practice school program report submitted in. Algorithm for automatic differential locking system of a. Another example began on the first year 1992 production of the restyled, and new 4. Both wheels on one axle will turn the same speed, but the power will go to the axle with the least traction. This website does not provide professional services advice the content on this website is intended to be a general information resource with regard to the subject matter covered, and is.
Supplement manifold vacuum for the differential lock system. Differential helps in turning the drive wheels at different rpm while the vehicle takes a turn. Air lockers utilize a compressor system that can lock the differential with the push of a button. The rear differential lock system is provided for use only when wheel spinning occurs in a ditch or on a slippery or rugged surface.
Differentials open, locked, limited slip, edl, quattro the open. Differential locks offroad driving systems driving and. Electronic differential lock system pdf electronic differential lock system pdf. Nov 23, 2012 a very highfriction differential, such as the zf sliding pins andcams type, so that there is locking from very high internal friction.
These allwheeldrive vehicles need a differential between each set of drive. A differential allows the driven wheels to turn at different speeds when turning a corner open differential. The eaton elocker4 is an electronic, selectable differential designed for drivers that need traction ondemand. For the fully differential transmission, a control law for the 2 interaxle and 3 interwheels locks of the. Drivercontrolled differential lock dcdl in rear rear axle iad lock disengaged. If youve read how car engines work, you understand how a cars power is generated. The 4 pinion gear design provides added strength and capability for more extreme vehicles, and features the fastest engagement. Exploded views are used to illustrate the parts and show their relationship to other parts on the carrier. Jul 14, 2016 a locking differential ensures that maximum power is put into all wheels, providing a much needed boost to your forward propulsion. A locking differential is designed to overcome the chief limitation of a standard open differential.
Press the rr diff lock switch to lock the rear differential. Automatic differential unit locking system report download. Interlock locks the differential between the axles. Drivercontrolled differential lock dcdl interaxle differential iad lock dcdl features and benefits. A locking differential is designed to overcome the chief limitation of a standard open differential by essentially locking both wheels on an axle together as if on a common shaft. This lock is in a position to offer decisive advantages in traction even in very demanding driving situations, for example when there is an extremely large difference in frictional coefficients on the drive wheels. The conventional differential is used to transmission of difference in speed to both the rear wheels and allows taking. Simply put, a differential is a system that transmits an engines torque to the wheels.
That has since been replaced by the 4motion system. Bmws electronic limitedslip differential used on the f10 5 series is an example of such a system. Differential mechanical device differential mechanical device 1. The proposed mechanism is to lock the differential. This lock is in a position to offer decisive advantages in traction even in very. Look at the spot where the line from the label right drive gear touches the drive gear. Differential shaft lock bolt rear axle noe 6351023 buy. Automatic differential unit locking system report download synopsis.
A locking differential, differential lock, diff lock or locker is a variation on the standard automotive differential. As mentioned in the entry on differentials, a vehicles differential converts the engine torque evenly and at different speeds to the driving wheels. The vw syncro system was originally developed by audi and then discarded in favor of a torsen diff, but vw incorporated the. In an allwheeldrive car, power and torque needs to be sent to all 4 wheels, but the wheels also need to be able to rotate at slightly different speeds in order to go around corners on dry. A differential lock control system for controlling the locking of the various differential assemblies associated with a particular work machine wherein such system includes a first switch. Both wheels are therefore operating as if were on a single shaft. The differential is found on all modern cars and trucks, and also in many allwheeldrive fulltime fourwheeldrive vehicles.
Mitsubishi pajero workshop manual pdf download manualslib. In order to simplify things, let us assume that the system is 100% efficient. How to use diff lock the right way 4site 4x4 tyres. If the transfer case differential is disabled, the front and rear wheels turn at the same speed. A differential lock commonly referred to as the difflock is a. Each differential lock can be engaged with the respective switch on the center console. Manufacturing of simple differential locking system. Therefore, your differential lock provides a traction control system and is a key component to preventing wheel spin, which can prove a life saver in treacherous driving conditions, such as snow or ice. Vtm4 lock mode the third mode of allwheeldrive engagement activates when the driver presses the lock button mounted on the instrument panel. Differential locks offroad driving systems driving. Variable torque management vtm4 explanation by gary flint american honda. Unless the air locker is activated, then the differential will remain in the open position, which is perfect for those who have rigs that double as.
The article deals with the development of a mechatronic system for locking vehicle differentials. A newly engineered electronic front differential lock is being used exclusively in the golf gti performance. Page 12 35b11 uk abs troubleshooting differential lock system code no. The vc is most often used as, or part of, the center differential in an awd system. If the gears of the differential lock system are not engaged, the indicator light remains blinking, so rotate the tires to engage the gear. Engagement of lock of locking differential to lock the wheels of an axle together is commanded by control unit. Automobile differential using wheel locking system. These allwheeldrive vehicles need a differential between each set of drive wheels, and they need one between the front and the back wheels as well, because the front wheels travel a different distance through a turn than the rear wheels. Differential locks lock the differentials in each axle. A differential is a gear train with three shafts that has the property that the rotational speed of one shaft is the average of the speeds of the others, or a fixed multiple of that average.
Upon activation, the pneumatic locking system stops the gears from rotating, thus locking the diff. The solution to the above problem is to have a differential locking system which can be engaged or disengaged either manually or automatically as per the conditions or a sensor based system can be developed that will sense the difference in speed or stalling of one wheel to lock the differential so that both wheels will have same traction. Kunihiko suzuki7 discussed a theory that a four wheel drive system of a. A brake lock differentialelsd is a system on modern 4wd vehicles that can make an open differential act like a locked one when needed if one tire is slipping and one is stopped one tire on ice. The rear differential lock system is effective in case one of the rear wheels. Differentials open, locked, limited slip, edl, quattro the. Electronic traction control systems may be integrated with antilock braking systems, which have a similar. Ordinary differential, traction, slip, stalls, dog ring. Utilizing a flyweight mechanism and selfenergizing clutch system, the eaton mlocker engages in low traction situations when a wheel speed difference of 100 rpm or greater leftto. Locking differential control system masseyferguson, inc. Vehicles usually have engines which are fuel injectedicinternal combustion and are controlled. Electronic differential lock system pdf download electronic differential lock system pdf. At the flip of a dash switch, drivers can go from open to 100percent locked. The rear differential lock system is effective in case one of the rear wheels is spinning.
Differential lock is applied to the rear wheel at this time. Warranty pdf made from quality metal, our differential pinion shaft lock bolt retains the pinion shaft to the rear differential. The locking differential functions as a regular or open differential but has the ability to lock the shafts leading to the two wheels on an axle together and forces them to rotate at the same speed. To have simple differential locking system, the different parts used are spike shaft, dog ring and dog moving selector mechanism. Differential mechanical device a cutaway view of an automotive final drive unit which contains the differential input torque is applied to the ring gear blue, which turns the entire carrier blue, providing torque to both side gears red and yellow, which in turn may drive the left and right wheels. Pdf validation of rear axle with differential lock for offroad.
An important benefit of this system is that it prevents the jamming of the vehicle in difficult adhesion. Automatic differential locking system international journal of. A limitedslip differential lsd is a type of differential that allows its two output shafts to rotate at different speeds but limits the maximum difference between the two shafts in an automobile, such. The maximum amount of reardrive torque is locked in until the vehicle gets moving and exceeds six mph, at which time rear drive torque is gradually diminished. By locking the differential the differential is disengaged from the axle.
Speedsensitive automatic locking differential that powers both drive wheels, yet automatically permits. Jul 04, 2000 a differential lock control system for controlling the locking of the various differential assemblies associated with a particular work machine wherein such system includes a first switch positionable to select any one or more of the differential assemblies for operation in their locked condition, a second switch actuatable to control the locking of the differential assemblies selected by the. The bolt is recommended for replacement when performing rear differential work. A control system for engaging, disengaging and reengaging a differential locking mechanism in an agricultural vehicle includes a control circuit configured to receive signals representative of vehicle operating parameters and to generate control signals corresponding to the desired state i. Torque is transmitted to both axles through interaxle differential action. At the flip of a switch, drivers can go from open to 100percent locked and back again. The locking differential control system of this invention includes, in addition to the various elements set forth above, a differential lock floor switch 32 of the momentary contact type, an. Empty the recycle bin, reboot and do another rav scan. Differentials open, locked, limited slip, edl, quattro. The structures of typical awd, 4wd transmissions enginean engine is the powerhouse of the vehicle. A locking differential provides increased traction compared to a standard, or open. Single reduction models with wheel differential lock forward axle rear axle axle capacity gear size dd404p rd404 40,000 lbs 15. Prototyping a system for truck differential lock control ncbi.
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