Views: 0 Author: Site Editor Publish Time: 2022-12-05 Origin: Site
At present, the drive axle of SINOTRUK series heavy vehicles are generall divided into two types - single-stage reduction axle and double-stage reduction axle.The single-stage reduction bridge adopts the central single-stage hyperbolic gear reduction, and thejudgment method isrelatively simple, which is not described in detail here.
The two-stage reduction drive axle is composed of the central primary reduction and the wheel reducer.The speed ratio of this axle assembly(that is, the speed ratio in the middle of the middle and rear axle) is the product of the central primary reduction speed ratio and the wheelreduction speed ratio.The wheel side reduction speed ratio of Steyr drive axle is 3.478(the 09 economic model is 3.10, which is rare at present). Due to this fixed speed ratio, we change the speed ratio of the central reducer to obtain the drive axle assembly withcorrespondingdferent speed ratio, which is why we usually call the middle speed ratio as the speed ratio of the axle assembly. Next, the speed ratios of themiddle drive axle and the rear drive axle are introduced respectively.
1.Rear drive axle (single axle vehicle)
According to different vehicle uses, the most common speed ratios are 6.72,5.73,4.8 and 4.42.As mentioned above, this speed ratio is theproduct of the central primary reduction ratio and the wheel side reduction speed ratio (3.478). The rear axle or single axle vehicle is in thespeed ratio through the rear axle basin teeth and angle teeth, so different speed ratio values can be obtained by changing the rear axle basinangle teeth with different speed ratios. There are 29 /15,28/17,29/21 and 33 / 26 rear axle basin angle teeth.The specific calculationmethods are described in the following table:
| Rear axle basin teeth | Operation method | Rear axle angle tooth | Answer | Operation method | Wheel side speed ratio | Answer (axle speed ratio) |
| Z=29 | divided by | Z=15 | 1.933 | multiply by | 3.478 | 6.72 |
| Z=28 | divided by | Z=17 | 1.647 | multiply by | 3.478 | 5.73 |
| Z=29 | divided by | Z=21 | 1.381 | multiply by | 3.478 | 4.80 |
| Z=33 | divided by | Z=26 | 1.269 | multiply by | 3.478 | 4.42 |
lt is worth mentioning that the inter-wheel differential housings matched to the middle section of the rear axle with different speed ratios arealso different.The 4.8-speed and 4.42-speed match the O503 differential housing, and the 5.73-speed and 6.72-speed match the 0198.Due tothe different application fields of the vehicle, the selected drive axle speed ratios are different, so in the maintenance or sales of rear axleaccessories, it is necessary to replace the basin angle teeth with the same number of teeth and the same type of diferential case for dfferentvehicles.
2.Middle drive axle (double axle vehicle)
The difference from the rear axle (single axle) is that in adition to the basin angle gear speed regulation, the medium axle also adds the
transition box cylindrical gear speed regulation.Therefore,itis necessary to change different basin angle gears and match different bridge boxgears to obtain different speed ratio values. This speed ratio is the total product of the basin angle gear speed ratio multiplied by the bridgebox gear speed ratio and the wheel side reduction ratio.There are 29/ 15 and 28/17 bevel gears of the middle axle and 136/137,208 1 209and 001 / 002 gears of the bridge box, which can form three speed ratios 1,0.839 and 0.771.The specificalculation method is described inthe following table:
| Middle axle basin teeth | Operation | Middle axle angle tooth | Answer 1 | Operation | Passive gear | Operation | Driving gear | Answer 2 | Operation | Wheel side speed ratio | Answer 3 |
| Z=29 | divided by | Z=15 | 1.933 | multiply by | Z=35 | divided by | Z=35 | 1 | multiply by | 3.478 | 6.72 |
| Z=28 | divided by | Z=17 | 1.647 | multiply by | Z=35 | divided by | Z=35 | 1 | multiply by | 3.478 | 5.73 |
| Z=28 | divided by | Z=17 | 1.647 | multiply by | Z=26 | divided by | Z=31 | 0.839 | multiply by | 3.478 | 4.80 |
| Z=28 | divided by | Z=17 | 1.647 | multiply by | Z=27 | divided by | Z=35 | 0.771 | multiply by | 3.478 | 4.42 |
Note: Answer 1*Answer 2=Answer 3
The key of the middle drive axle is to determine the number of teeth of the cylindrical gear (active and passive gear teeth) of the transition box
and the basin angle teeth of the middle axle to determine the middle speed ratio.
Different from the rear axle reducer, the middle axle has a transition box device, which plays a very important role. The axle box transmits the
force from the transmission to the middle axle and the rear axle, and enables the differential operation of the middle and rear drive axles. The
power output by the transmission is transmitted to the differential planetary gear through the inter shaft differential housing, and the planetary
gear drives the half shaft gear to be transmitted to the rear drive axle through the hollow spline shaft. The function of the inter axle differential
is to evenly distribute the transmitted engine power to the middle and rear drive axles, and at the same time, it can automatically adjust the
instantaneous speed of the middle and rear axles, so that the middle and rear axles can operate the differential.
It should be noted here that each speed ratio of the middle drive axle uses the inter wheel differential housing 0165 and the inter axle
differential housing 0166. Similarly, when replacing new parts, pay attention to that the number of bevel teeth and the number of teeth of active
and passive cylindrical gears should be consistent with the old parts.
