差速器外文文獻(xiàn)(共6頁)

1、精選優(yōu)質(zhì)文檔-傾情為你奉上差速器外文By ordinary differential planetary gear, the planet round rack (differential shell) and half axle gears, etc parts. By the power of the engine, direct drive shaft into differential planetary wheel frame, again by the planets wheel drive left, right, two half shaft are respectively

2、driven wheels left and right. Differential design requirements meet: (left) + (right shaft speed shaft speed) = 2 (planets wheel frame speed). When the automobile moher, left, right wheel and planetary wheel frame three speed equal in balance, while in the car when turning three equilibrium state is

3、 destroyed, cause the medial wheel speed decreases, and the lateral wheel RPM increases. Automotive differential is driven axle Lord pieces. Its function is to both sides half shaft transmission power, while allowing both sides half shaft in different speed rotating, satisfy both sides wheel as pure

4、 rolling forms do isometric driving, reducing tire and the surface friction. Differential this adjustment is automatic, here involves "minimal energy consumption principle", namely earth all objects are inclined to consumption minimum state. For example a grain of beans into a bowl, beans

5、will automatically stays in the bowl bottom and never stay in bowl wall, because bowl bottom is lowest energy position (potential), it automatically select static (minimum) without constantly kinetic energy movement. In the same way, Wheel in cornering would also automatically tendency of the lowest

6、 energy consumption in accordance with state, automatically turning radius adjusting right wheels speed. When cornering, due to the lateral friction wheel dragged phenomenon, medial wheel have slip phenomenon, two driving wheel now can produce two opposite direction of additional force, as a result

7、of "minimal energy consumption principle", which inevitably leads on both sides of the wheel speed difference, thus destroyed three balance relationship, and through the half shaft are reflected in half axle gear, forcing planetary gear produce rotation, make the lateral half shaft speed f

8、aster, medial half axle planetismal, thus realize both sides wheel speed difference. If the drive wheels on either side of the drive axle shaft to the use of a whole rigid connection, the two wheels can only at the same Angle rotation. So, when the vehicle steering wheel drive, due to the lateral th

9、an medial wheels moved across the distance is big, will make the lateral wheels in rolling produced simultaneously slippery procrastinate, and medial wheels in rolling produced simultaneously slip. Even the car run straight road gravamen, because although pavement straight but tyres or rolling radiu

10、s range (tyre manufacture error, wear different, by the uneven or pneumatic ranging caused by the wheels of sliding). Wheel when not only aggravate sliding tire wear, increase power and fuel consumption, still can make the vehicle steering difficulties, braking performance becomes poor. For the whee

11、l as far as possible will not occur in the structure of sliding, must guarantee the wheels can come with different Angle rotation. Axis between differential: usually driven wheel bearings for support on spindle, enable to any Angle rotation, and drive wheels respectively with two root half axle rigi

12、d connection, in between two root half shaft with differential. This differential also called shaft between differential. slowly, right wheels faster, with different speed to compensate for the distance of the differences. If after axles make it a whole, he couldn't do it on both sides of the wh

13、eel speed difference, namely can't do an automatic adjustment. In order to solve this problem, as early as in a hundred years ago, France Renault automotive company founder luis Renault will design a differential in this thing. Modern vehicles on the differential usually according to its work ch

14、aracteristics into gear type differential and slip differential two kinds big. The structure of the Cherokee open-die differential is typical of planetary gear set structure, only the sun wheel and outside the pinion gear ring are the same. In this planetary gear set, driving gear is planet shelf, p

15、assive round is two SUNS wheel. Through the planetary gear set the transmission properties we know, if the planet shelf as ZhuDongZhou, two SUNS wheel speed and rotation direction is not affirmatory, even two SUNS wheel rotation direction is the opposite. Vehicle condition, this differential moher,

16、feature is to two and a half shaft transmission torque of the same. In a driving wheel impending case, if the drive shaft rotation, have adhesion is uniform the driving wheels of driving force, if there is no drive shaft rotation is accelerated, have adhesion the driving wheels driving force equals

17、impending wheel Angle acceleration and rotary inertia of the product. Vehicle turning tires don't skid condition, connect the two halves of the differential shaft torque direction is opposite, give the vehicle driving forward, and only the inside of the wheel, the planet shelf and medial sun rou

18、nd by the isokinetic transmission between became deceleration transmission, driving sensation is accelerated speed corners than straight more powerful. The advantages of open-die differential is installed in the pavement turned driving on the best effect. Weakness is in a driving wheel loss adhesion

19、, under the situation of another nor driving force. Open-die differential is the suitable scope that all paving road traffic, front axle and rear axle driver drive can be installed. 2. Limited slip differential Limited slip differential used for parts make up open-die differential transmission in of

20、f-road defects, it is in the open differential institution improved, and the differential shell side increase friction between gear piece, corresponding to the planetary gear set speaking, is the planet shelf and the sun round between increased friction slices, increase the sun wheel and planet shel

21、f free rotating resistance torque. Limited slip differential provide additional torque, and friction slices transfer of power and two driving wheel rotation difference of concerned. In open-die differential structure to improve on LSD, cannot produce 100% limited slip, because the limited slip coeff

22、icient, the higher the vehicles to the characteristics of the poor. LSD have open-die differential transmission characteristics and mechanical structure. Advantage is to provide certain limited slip torque, defect is turning performance becomes poor, friction slices limited life. LSD is the suitable

23、 scope paving road surface and mild off-road. Usually used for the drive. Former drove generally does not installed, because LSD interfere steering, limited slip coefficient, the greater the steering the more difficult. Three. The lock type differential (mechanical locking check, electric the lock,

24、pneumatic locking check) In order to guarantee the off-road vehicles in complex conditions, driving performance through certain mechanical structure of the differential locked achieve two half axle synchronous rotation. Through the analysis of planetary gear set is the planetary gear set of gear mec

25、hanisms locked, guarantee the planet shelf wheel with the sun, and two SUNS round between the transmission ratio between is 1:1. Can the sun to the wheel and planet shelf the lock, can put the planet shelf and planetary gear locked, still can put two SUNS wheel locked. The lock type differential, wi

26、thout the lock, its transmission characteristics and open-die differential exactly the same as that in the lock, under the situation of transmission ratio was fixed for 1:1. The advantages of this differential in off-road self-evident that provides the biggest drawback is the driving force, the diff

27、erential lock up the situation, vehicle steering extremely difficult, Existing single wheel inherit engine 100% torque possible, half shaft will because torque excessive deformation or break, Vehicles in the process of steering bearings, two and a half by opposite torque, if both sides tires adhesio

28、n are large, would wring half axle. Moreover, this kind of differentials, the vehicle process execution lock up the action will produce larger noise. Four. Electronic differentials lock Electronic differentials lock and the aforesaid compared, without changing the structure and characteristics of op

29、en-die differential, but use ABS or EBD system to implement unilateral braking skid wheels movement, limit of two driving wheel rotation difference, guarantee the drive wheels momentum. Advantages: good safety, won't damaged vehicle. Faults: need ABS and costly; EBD system, In the harsh off-road

30、 conditions, electronic product reliability as mechanical products; Unilateral wheel driving force, as the lock type differential. 1, gear type differential: When driving wheel rotation difference exists about when, differential assigned to slow turns driving wheel torque is greater than turn fast d

31、riving wheel torque. This kind of differential torque partitioning characteristics can satisfy the car in good pavement moving. But when the automobile in bad the road, but serious influence through capacity. E.g. when a car driving wheel into muddy road, although another driving wheel in good road,

32、 the car was often cannot advance (known as slips). At this point in the muddy road on the driving wheels in-situ slip, in good road wheels is motionless. This is because in the muddy road wheels and road surface adhesion between the lesser, road only through this round of half-and-half shaft role o

33、f smaller reaction torque, therefore differential assigned to this round of torque also small, although another driving wheel and better road to improve adhesion of the larger, but because average distribution characteristics of torque, which make this drive wheels can only also assigned to the drive wheels with slip equal amounts of torque, so that the driving force to overcome driving resistance, cars can't advance and motivation is expended in slip driving wheel. At this time to floor not only made the car ahead, instead of waste fuel, accelerate parts wear, especially ti