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外文資料譯文
Driving Axle
l automobile driving axle
The driving axle is one of cross bars supporting a vehicle, on which the driving wheels turn .The driving axle includes a housing ,an axle drive ,a differential , tow axle shafts (half axles ),and final drives (if any ) .
The axle .or main, drive is a drive-line unit that increases the torque delivered by the transmission and transmits it to the driving wheels, via the differential. In automobiles, the axle drive shaft, usually called the propeller shaft.
The axle drive may be a Single or a double-stage type, the former comprising a pair of gears and the latter .tow pairs of gear. Drive pinion I may be made integral with its shaft, or it may be detachable from the shaft. Driving gears and are usually made in the form of detachable gear rings that are bolted or riveted to the differential case .Alex drive bevel pinions and gears are made with helical teeth in order to reduce noise in operation.
The tow-stage axle drive consists of a pair of bevel gears and a pair of spur gears. Drive bevel pinion drives bevel gear that is fixed to the flange of the intermediate shaft made integral with 2nd –stage driving spur gear .Gears meshes with driven spur gear which is fastened to the case rotates in taper roller bearings installed in the differential carrier that makes part of the driving axle housing.
The differential is a drive-line unit that divides the torque applied to it between the tow axle shafts and allows one driving wheel to turn at a different speed from the other.
The differential consists of case, cross or spider pinion .and side gears, also known as axle gears .the differential pinions are freely mounted on the cylindrical arms of the spider, which is held in the differential case, and remain in constant mesh with the differential side gears.
When the automobile is moving down a straight and even road, both driving wheels meet with one and the same rolling resistance. In this case, axle driven gear, or differential ring gear, causes the differential case to rotate .when the differential case rotates pinions and their spider arms move around in a circle with tow differential side gears are meshed with the pinions, the side gears must rotate, causing the axle shafts and their associated driving wheels to turn. With equal resistance applied to each wheel, the differential pinions do not rotate. They apply equal torque to the side gears and therefore both driving wheels rotate at one and the same speed is unequal ,the differential pinions rotate on their spider arms as well as drive round with the differential case .supposing that one of the axle shaft is prevented from rotating ,the differential pinions would have to walk around the stationary side gear ,causing the other side gear to rotate at twice its normal speed .You can now see how the differential can allow one driving wheel to turn faster than the other .
Whenever the automobile goes around a turn ,the outer driving wheel travels a greater distance than the inner drive wheel .the inner wheel speeds up proportionately ,thanks to the differential pinions that rotate on their spider arms and ,rolling around the slower side gear send more rotary motion to the outside wheel.
The differential side gears are splined on to the inner ends of the axle shafts .The other ends of the shafts are attached to the driving wheel hubs by means of flanges .Trucks use full floating axle shafts .Such axle shafts are acted upon by torque only .All the other loads acting on the driving wheels are taken by the driving axle housing, because the wheel hubs are supported by bearings mounted on the housing.
l Driving axle of general-purpose wheeled tractor
General-purpose wheeled tractors are a four-wheel drive type, they have tow driving axles-front and rear .Both axles are similar in construction, expect for the housing. Each driving axle consist if a housing, an axle drive ,a differential ,and final drives .The front and rear-axles drives are interchangeable and comprise a pair of spiral bevel gears . The axle drive pinion is made integral with a shaft that is supported by tow taper roller bearings installed in axle drive pinion carrier .The latter is accommodated in differential carrier and is fixed to it by bolts. The flange of the axle drive pinion carrier is provided with threaded holes to fit puller screws that are used to remove the axle drive pinion carrier from the differential carrier .The position of the drive pinion relative to the centerline of the axle is adjust by means of a pack of shims placed under the flange of the drive pinion carrier Shims palace under the cone of the front bearing are used to adjust the preload on the drive pinion bearings. Splined to adjust the preload on the drive pinion shaft is universal-joint flange .The axle drive gear is bolted to the differential case flange.
THE DIFFERENTIAL consists of case, four pinions, and tow side gears .The differential case comprise tow halves that are bolted together and supported by taper roller bearings installed in the differential carrier .Screwed in the bearings housing from the outside are nuts used to adjust the backlash between the ring gear and drive pinion teeth and the side bearing preload.
Welded to the top of the driving axle housing at both its ends are spring pads .The housing of both its ends are spring axels are provided with filler ,overflow ,and drain holes closed by plugs .Both housing also have vents ,The rotating components of the driving axles are lubricated with transmission oil .
As distinct from the automobiles considered in this text, all tractors include final drives in their power trains .The final drives of general-purpose wheel tractors are referred to as wheel-hub reduction gears.
While transmitting power to the driving wheels, wheel-hub reduction can increase their torque .These are planetary reduction gear sets consist of sun gear ,or wheel ,three planet ,or pinion ,gears ,planet or pinion ,carrier .stationary internal ,or ring ,gear ,and housing.
The sun gear is splined to the outer end of the axle shaft is splined to the differential side gear .The cylindrical planet gears are in constant mesh with both the sun gear and the ring gear and are free to rotate on roller bearings mounted on shafts that are attached to the planet carrier .The planet carrier is fasted to the reduction gear housing by means of studs and nuts .The flange of housing ,driving wheel brake drum 13,and wheel hub are clamped together by bolts .The planet carrier and reduction gear housing form the driven part of the planetary gear set and rotate with the driving wheel of the tractor .The driving gear hub is supported by taper roller bearings mounted on axle shaft housing ,or axle sleeve .The axle sleeve is connected to the stationary ring gear by means of adapter hub that has internal splines and external teeth . The splines are meshed with matching splines on the axle sleeve, and the teeth are meshed with internal teeth ring gear.
Wheels and its maintain
Modern wheeled tractors and automobiles use pneumatic-tired disc wheels. As a result of the driving wheel tires gripping the road, the rotary motion of the wheels is transformed into the translational motion of the tractor or automobile.
According to their purpose, wheels are classified as driving .driven steerable, and combination types.
Trucks and general-purpose wheeled tractors have all their wheels of one and the same size .Row-crop tractors have their rear wheels larger than the front wheels .The rear wheels carry the major proportion of the load due to the weight of the tractor .The front wheels are loaded lighter and this makes them easier to turn and provide good directional steering stability, which is essential for row-crop work.
A TRUCK WHEEL consists of disc and flat base rim that is made integral with it, while the other flange is formed by detachable side ring that is held to the rim by split lock ring on the rim .which doubles as a side ring and a lock ring.
The wheel disc is provided with holes for mounting the wheel on the wheel mounting bolts ,or wheel studs ,on the wheel hub ,where it is fixed by nuts .Both the holes and the nuts are tapered to ensure exact location of the wheel on its hub .The rear driving axles of trucks carry tow wheels at each end .The inner wheels are held to the hubs by cap nuts that are threaded both on the inside and on the outside .and the outer wheels are mounted on the cap nuts and fixed in place by taper nuts screwed on the nuts .
The wheel nuts on the right side of truck have right-hand threads, whereas the nuts on the left side of the truck are threaded left-hand .The reason is to tighten the nuts, not loosen them, and thus prevent them from working loose on acceleration and braking.
An automobile pneumatic tire consists of casing, inner tube, and flap .The tire casing comprises tread, side walls, and beads .Tires for good roads use small tread patterns, while those for bad roads or cross –country service large tread patterns.
The inner tube is made in the form of a hollow elastic rubber doughnut that is inflated with air after it is installed inside the tire and the tire is put on the wheel rim .The inner tube is inflated through tire valve that consists of housing 11,valve inside ,and cap .The valve housing is made of brass in the dorm of a flanged tube that is mounted in the inner tube by means of a washer and a nut and sticks out through a hole in the wheel .Some tire valve housing are of comprise construction :the upper part is made of brass and the lower part ,of rubber that is vulcanized on to the inner tube .The valve inside is a check valve that opens to let air in the inner tube when an air closed ,spring pressure and air pressure inside the tube hold the valve .When the valve is closed ,spring pressure and air pressure inside the tube hold the valve in its seat .It includes core with a rubber ring ,a plunger pin ,and a spring .The valve inside is Screwed in the tire valve housing and is closed by the cap Screwed on the housing.
To the construction of the driving and steerable wheels, each wheel comprises hub , disc with rim ,and tire with inner tube .The rim is welded to the disc and the disc is bolted to the hub .
The driving wheel tires are of low-pressure type and have heavy tread bars for better traction.
The driving wheel hub is keyed to axle shaft and is fixed in place by means of bolted-on insert with worm whose threads mesh with the rack teeth cut in the half axle .By turning the worm one can change the position of the wheel on the axle shaft to obtain the desired track width .Before doing this ,it is necessary to jack up the rear part of the tractor to clear the wheels of the ground and loosen the bolts that hold the inserts to the wheels hubs .Should this adjustment prove insufficient ,the track width can further be increased by placing the wheels with the concaves of their discs facing inwards.
On some row-crop tractors ,the rear wheel discs are bolts to lugs welded on the wheel rims .In this case ,the crack width can be changed by bolts the discs in alternative positions to the lugs .Also the concave wheel discs may be used either with the concave facing inwards or outwards.
Trouble-free operation of automobiles and wheeled tractors largely depends on the condition of the tires. Therefore, during operation, one should adhere to following rules.
Prevent fuel and, or oil from getting onto the tires. Cleans the tires regularly from dirt and remove all foreign articles, such as stones, form the treads. Do not apply brakes sharply, never start away form rest with a jerk, and avoid making sharp turns, for all this causes uneven wear of the tires. Do not allow excessive slipping of the driving wheels. When preparing your tractor or automobile for a long-term storage, jack up the wheels and put trestles under the axles or frame to relieve the tires.
The service life of tires is expressed in terms of their mileage. For most bias (ordinary) truck tires, the guaranteed mileage amounts to 50000 km. Observing the above rules will help prolong the useful service life of tires.
驅動橋
汽車的驅動橋
驅動橋是一個支撐車輛的十字交叉的軸，它可以驅動車輪運動。驅動橋包括：驅動橋殼、主減速器傳動軸、差速器、兩個半軸和末端傳動裝置。
主減速器在傳動中的功用是增大變速器傳來的轉矩，憑借差速器把它傳遞給驅動車輪。在汽車中主減速器傳動軸把轉矩按正確的方向傳給驅動輪，通常被叫做推進器。
主減速器有單級和雙級兩種形式，前者包含一對齒輪，后者包含兩對齒輪。主動小齒輪可以和軸做成一個整體，也可以做成分開的。從動齒輪常做成齒圈形式，差速器殼可以用螺栓或鉚釘連接在齒圈上，主減速器的小齒輪和大齒輪可以做成螺旋齒，這樣可以在嚙合時減少噪音。
雙級主減速器包含一對錐齒輪和一對圓柱齒輪，主動齒輪帶動從動錐齒輪旋轉而從動錐齒輪和小圓柱齒輪通過中間軸連在一起從而使小圓柱齒輪轉動，它與差速器殼固定在一起的大圓柱齒輪嚙合，差速器殼的旋轉帶動差速器運動并和軸承裝設構成橋殼的一部分。
差速器在傳動系中將轉矩分開分別驅動兩側半軸，并且允許一側驅動輪和另一側驅動輪以不同的角速度運動。
差速器包括差速器殼、行星齒輪軸（十字軸），行星齒輪，側面齒輪即半軸齒輪。行星齒輪可以安裝在卡在差速器殼上的圓柱形十字軸上，并且保持與半軸齒輪的不斷嚙合。
當汽車直線行駛和在水平路面上運動時，兩側驅動輪將會遇到相同的滾動阻力。在這種情況下，主減速器從動齒輪帶動差速器殼旋轉。當差速器殼旋轉時差速器行星齒輪和十字軸也旋轉運動，因為半軸齒輪差速器行星齒輪嚙合，半軸齒輪必須旋轉，導致半軸與兩側車輪也運動。當每一個車輪承受的阻力相等時，差速器小齒輪不再旋轉，它們給半軸齒輪提供相等的轉矩且兩側車輪以一個相同的角速度旋轉。當然，當阻力不相等時，差速器行星齒輪既繞著差速器殼公轉又繞十字軸自轉，如果一側半軸不旋轉時，行星齒輪不會繞著固定不動的半軸齒輪運動，使另一側半軸齒輪以平常兩倍的速度旋轉。這樣你就明白差速器是怎么使一側齒輪轉速大于另一側的。
無論什么時候汽車轉彎行駛時，外側車輪總比內側的車輪移過的距離大。內側車輪會慢下來，而外側車輪則成比例地加速，由于差速器在十字軸上自轉，且在速度慢的一側的半軸齒輪上滾動，它將使外側車輪移動的快一些。
半軸內端用花鍵與差速器半軸齒輪連接，外端用凸緣與驅動輪輪轂相連。載貨汽車采用全浮式半軸。這樣的半軸只承受轉矩作用。其余的負載由橋殼承擔，因為輪轂由安裝在橋殼上的軸支撐的。
輪式拖拉機的驅動橋
一般的輪式拖拉機采用四輪驅動的形式，它有兩個驅動橋——前驅動橋和后驅動橋。除了橋殼之外，兩個橋的構造很相似。每個驅動橋都包括橋殼，主減速器，差速器和末端傳動裝置。前后驅動橋可以互換，且都包含一對螺旋錐齒輪。主減速器的主動錐齒輪與軸做成一體，并由兩對圓錐滾子軸承支撐，并用螺栓與差速器殼聯(lián)接。主動錐齒輪凸緣外有螺紋孔與配套的螺釘，用于防止主動錐齒輪在差速器殼作用下運動。關系到車軸中心線的主動錐齒輪的位置是由裝在主動錐齒輪后的調整墊片來調整的，裝在圓錐滾子軸承內座圈的調整墊片用來調試安裝在主動錐齒輪上的軸承的預緊力。齒輪軸的軸徑末端的凸緣采用一般的花鍵聯(lián)接。從動錐齒輪用螺栓與差速器殼凸緣固定在一起。
差速器包括差速器殼、四個小行星齒輪，兩側半軸齒輪。差速器殼由兩部分構成，它們用螺栓連接在一起，并由圓錐滾子軸承裝置支撐。軸承套外面的螺母用來避免齒圈和主動錐齒輪發(fā)生運動干涉，使它們正確嚙合，并調整軸承的預緊力。
焊在橋殼兩端頂部的是彈簧緩沖器，每個橋殼上都有注油孔，并用油塞塞住。每個橋殼都有一個通風孔。橋殼內的旋轉運動部件都涂有潤滑劑。
在本書之中所有靠末端傳動提供動力的拖拉機與汽車考慮的地方有所不同?？磕┒藗鲃拥囊话阌猛镜妮喪酵侠瓩C有的裝有輪邊減速器。
當傳來的轉矩驅動車輪運動時，輪邊減速器也可以增大扭矩。這些像行星般運動的減速齒輪裝置包括太陽輪、行星齒輪、行星架、齒圈和減速器殼。
太陽輪用花鍵聯(lián)結在半軸外側的末端并且用鎖緊螺母擰緊固定。半軸的另一端則用花鍵聯(lián)結著半軸齒輪。圓柱行星齒輪分別與太陽輪和齒圈嚙合，且繞裝在行星齒輪軸上的滾子軸承自轉，行星齒輪軸安裝在行星架上，行星架用螺栓和螺母固定在減速器殼上。減速器殼上的凸緣，制動鼓，輪轂，用螺栓固定在一起，行星架，減速器殼上的行星裝置的運動部件與驅動輪一起旋轉運動。齒輪座由半軸套管上的滾子軸承支撐。半軸套管與固定的齒圈用接合套連接起來，接合套有內花鍵槽和外齒。內花鍵槽與半軸套上的花鍵嚙合，外齒與齒圈的內齒嚙合。
太陽輪驅動行星齒輪運動，并使固定的齒圈旋轉。因為行星齒輪軸與行星架固定在一起，所以行星齒輪可以帶動行星架旋轉，并通過減速器殼驅動驅動輪運動。
輪邊減速器的部件都通過減速器殼中央的一個孔來注入潤滑油。這個孔有量油尺并用油塞塞住。量油尺上刻有兩個痕跡，一個是減速器殼內的最大油位，另一個是其最低油位。
車輪及其保養(yǎng)
現代的輪式拖拉機和汽車都采用充氣式輪胎，輪胎與路面接觸，汽車和拖拉機的車輪滾動來驅動汽車運動。
按它們的用途分，車輪可分為乘用車用輪胎和牽引車用輪胎以及兩者相結合的類型。
在貨車及一般的輪式拖拉機中，每輛車所用的輪胎型號是一樣的。農用拖拉機后輪比前輪大，后輪承受拖拉機載重的70%，并且后輪能提供更好的牽引力。前輪承受的重量少，它比較容易轉向且提供良好的行駛方向，這是農用車必不可少的。
貨車的車輪包括輻板, 輪輞，輪輞是焊在輻板上的。當輪輞與一個凸緣做成整體時，與另一凸緣則做成可分的側擋圈，它是由分裂的擋圈支撐，一些貨車車輪只有擋圈，它包含側擋圈和鎖環(huán)。
輻板上裝有車輪框架的螺栓孔，在輪轂上有雙頭螺栓，它配有螺母。在輪轂上的孔及螺母安裝在精確的位置。貨車后車橋采用雙車輪，內側車輪有輪轂支撐并由螺母固定，螺栓兩頭都有螺紋，且內側車輪裝有螺母，螺母上的外螺紋用鎖緊螺母固定。
貨車右側車輪輻板固定螺栓用右旋螺紋，左側車輪輻板固定螺栓用左旋螺紋。這可以使汽車在行駛中螺母變緊不拖松，并且可以防止它在汽車加速或制動時變松。
汽車可沖氣式輪胎包括外胎、內胎和墊帶。外胎有胎冠、棉布層和束帶層。輪胎在良好路面上使用的花紋細而淺，在壞路面上花紋則深而寬。
橡膠輪胎內部是中空的，它可以充氣，它裝在輪圈內。輪胎充氣用氣門閥充氣的，它包括座筒、閥體和蓋。座筒是有黃銅做成的，它用螺栓和墊片擰緊裝在車輪輪輞上的孔內。一些輪胎氣門閥的材料是合成的，上面用黃銅制成，下面用經過硫化的橡膠制成的。氣門閥的內部有一裂縫，是為了讓空氣能充入輪胎。當氣門閥關閉時，彈簧壓力和輪胎內的空氣壓力使管子恢復原位。它包括帶橡膠環(huán)的氣門芯、活塞和彈簧。
對于農用拖拉機的驅動和前進輪來說，每個輪子都由輪轂，帶輪圈的輪輞，帶內胎的輪胎的構成。輪圈焊接在輪輞上，輪輞與輪轂用螺栓固定在一起。
驅動輪的輪胎是低壓的，胎面有深花紋，這可以獲得較好的牽引力。
驅動輪的輪轂要于半軸相適應，且能代替螺栓，使螺紋與半軸的鍵齒嚙合。轉動螺紋可以改變輪子在半軸上的位置，獲得想得到的輪距。那樣做之前需要用千斤頂支起拖拉機的后部，并清潔與地面接觸的輪子，松開螺栓，使其插入輪轂，如果這樣的調整還不適合，輪距可以通過使輪輞凹面向內來進一步加大。
在一些收割機上，后輪輞與焊接在輪圈上的把手用螺栓固定在一起。在這種情況下，輪距可以通過改變在把手上輪輞螺栓的位置來改變。同樣，輪輞凹面可以朝向內也可以朝向外。
汽車和拖拉機在使用過程中遇到的問題多數是由輪胎的狀況引起的。所以，在使用過程中，應遵循以下規(guī)定。
避免燃料或油弄到輪胎上。經常清洗污物和胎面上英文字母縫里的沙石。盡量不要緊急制動、不要長時間不清理和避免急轉彎。這些因素會使輪胎磨損不均勻。同時也不允許驅動輪過度滑動。當準備長時間擱置汽車時，要用千斤頂頂起車輪，在車軸下放一個支架或者框架，使車輪受到的壓力得以緩解。
輪胎的使用壽命是用行駛里數來表示的。對于大多數普通貨車的輪胎，它的壽命是50000Km。但是如果注意以上的規(guī)定，則可以延長輪胎的使用壽命。
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