《差速器外文文献(共6页).doc》由会员分享，可在线阅读，更多相关《差速器外文文献(共6页).doc（6页珍藏版）》请在taowenge.com淘文阁网|工程机械CAD图纸|机械工程制图|CAD装配图下载|SolidWorks_CaTia_CAD_UG_PROE_设计图分享下载上搜索。
1、精选优质文档-倾情为你奉上差速器外文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 will automat
5、ically 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 energy cons
6、umption 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 of minimal e
7、nergy 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 faster, medial half axle
8、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 than medial wheels moved a
9、cross 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 radius range (tyre manufactur
10、e 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 wheel as far as possible wil
11、l 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 rigid connection, in between
12、 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 couldnt do it on both sides of the wheel speed difference, namely
13、cant 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 characteristics into gear type diffe
14、rential 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, passive round is two SUNS wheel. Th
15、rough 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, feature is to two and a half shaft
16、 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 impending wheel Angle acceleration
17、 and rotary inertia of the product. Vehicle turning tires dont 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 round by the isokinetic transmission betwe
18、en 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, under the situation of another nor dr
19、iving 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 off-road defects, it is in the open diffe
20、rential 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 shelf free rotating resistance torque. Limi
21、ted 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 coefficient, the higher the vehicles to the
22、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 scope paving road surface and mild off
23、-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, pneumatic locking check) In order to gu
24、arantee 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 mechanisms locked, guarantee the planet sh
25、elf 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, without the lock, its transmission charac
26、teristics 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 differential lock up the situation, vehicle
27、 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 adhesion are large, would wring half axle. Mor
28、eover, 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 open-die differential, but use ABS or EBD
29、 system to implement unilateral braking skid wheels movement, limit of two driving wheel rotation difference, guarantee the drive wheels momentum. Advantages: good safety, wont damaged vehicle. Faults: need ABS and costly; EBD system, In the harsh off-road conditions, electronic product reliability
30、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 driving wheel torque. This kind of differenti
31、al 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, the car was often cannot advance (known as
32、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 of smaller reaction torque, therefore differe
33、ntial 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,
34、so that the driving force to overcome driving resistance, cars cant 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 tire wear is intensified. Effective solutions are: slicer slip dri
35、ving wheel under the mud or in this wheel mat dry soil, gravel, branches, hay, etc. 2, slip differential: In order to improve the car in a bad way through capacity, some off-road vehicle and limousines screwup slip differential. Slip differential characteristics are, when driving wheel in a bad way
36、side slip, can make the most or all torque in good road to the driving wheels, to take full advantage of the drive wheels adhesion to generate enough force, that car start or continue to drive. 1. Differential shell there cannot be any properties of crack, shell and planetary gear gaskets, different
37、ial half axle gear contact between, should be smooth without groove, If there is a slight groove or wear, can continue to use after grinding, otherwise must be changed or be repaired. 2 the planetary gear differential shell and planetary gear wheel when the fitting clearance must not be more than 0.1-0.15 mm, half axle gear shaft neck and shell with holes for clearance fit, should have no obvious loose feeling, otherwise desert must be changed or repair. 专心-专注-专业