The AL4 automatic transmission is developed by the French PSA Group (Peugeot SAbeautifulGroup) andrenaultThe transverse, less maintenance and electronically controlled automatic transmission jointly developed and designed by the company has four forward gears and one reverse gear. At present, it is mainly equipped inCitroenXU steamdiesel oilengineTU5JP/K produced by DPCAengineOn.In China, the automatic transmission is mainly used for thewealthy and healthy988. InspurElysee, Senna, Picasso and other passenger cars.The mechanical structure of AL4 automatic transmission installed in different models is basically the same, but the electronic control system is different.AL4 automatic transmission adopts Simpson II planetary gear system, and the power transmission diagram is shown in Figure 1.The planetary gear mechanism consists of two single row single-stage planetary gear mechanisms.The rear inner gear ring (C1) is connected with the front row star carrier (PS2) and the first reduction driving gear, which is the power output end;The front inner gear ring (C2) is integrated with the rear star carrier (PS1);The two sun wheels move independently.See Table 1 for the status of various components of the planetary gear unit at different gearsclutchandBrakeSee Table 2 for the status of.
According to the transmission ratio calculation equation of single row single-stage planetary gear mechanism, the front and rear planetary gear trains are substituted respectively, and the following equations are obtained: (n11-n1H)/(n13-n1H)=- Z13/Z11...... Formula (1) (n21-n2H)/(n23-n2H)=- Z23/Z21...... Formula (2) Where: N11 - front row sun wheel speed;N1H front row star rack speed;N13 - Speed of front inner gear ring;N21 rear sun wheel speed;N1H rear row star rack speed;N23 - Speed of rear inner gear ring;Z11 - Number of front row sun gear teeth;Z13 - Number of teeth of front inner gear ring;Z21 - Number of rear sun gear teeth;Z23 - Number of teeth of rear inner gear ring
Since the planet carrier of the front planet row is integrated with the gear ring of the rear planet row, it is: n1H=n23.At the same time, the gear ring of the front planetary row is integrated with the planet carrier of the rear planetary row, so it is: n13=n2H.
Number of teeth of each part: front sun wheel Z11=40;Front inner gear ring Z13=80;Rear sun wheel Z21=33;Rear inner gear ring Z23=81.
1.1 Block
In first gear,clutchE1 engagement, power is transmitted from the input shaft to the rear sun wheel P1, and 1-2 gearsBrakeF3 works to brake the front sun gear P2, and the power is output by the rear gear ring/front row star carrier C1-PS2. The power transmission route is shown in Figure 2.
From the above analysis, it can be seen that the front and rear planetary rows are involved in power transmission in gear 1, that is, n11=0,n1h=n23,n13=n2h,Substitution formula (1) and formula (2) are: i=n21/n1h=(Z11Z21+Z11Z23+Z13Z21)/Z13Z21=7200/2640=2.7272727
2.2 Gear
In the second gear, the clutch E2 is engaged, and the power is transmitted from the input shaft to the rear planetary rack/front inner ring gear (PS1-C2) through the clutch E2. The 1-2 gear brake F3 works to fix the front sun gear P2, and the power is output from the rear ring gear/front planetary rack C1-PS2. The power transmission route is shown in Figure 3.
From the above analysis, it can be seen that only the front planetary row transmits power in gear 2, that is, n11=0. The substitution formula (1) has: i=n13/n1h=Z1h/Z11=(Z13+Z11)/Z13=(40+80)/80=1.5
3.3 Gear
In gear 3, clutch E1 is engaged, and power is transmitted from the input shaft to the rear sun wheel P1;At the same time, clutch E2 is engaged, and power is transmitted from the input shaft to the rear planetary array star carrier/front inner ring gear (PS1-C2) through clutch E2.Since two parts of the planetary gear unit are driven at the same time, the entire planetary gear unit rotates at the same speed, and the power is output by the rear gear ring/front row star carrier C1-PS2, with a transmission ratio of 1:1.See Figure 4 for the transmission route of the third gear power.
4.4 Gear
In the fourth gear, the clutch E2 is engaged, and the power is transmitted from the input shaft to the rear row star carrier/front row inner gear ring PS1-C2;At the same time, the fourth gear brake F1 works to fix the rear sun gear P1. The power is output by the rear gear ring/front row star carrier PS2-C1. See Figure 5 for the transmission route of the fourth gear power.
From the above analysis, it can be seen that only the rear planetary row transmits power in the fourth gear, that is, n21=0. The substitution formula (2) has: i=n2h/n23=Z23/(Z21+Z23)=81/(33+81)=0.7152632
5. R gear
In gear R, clutch E1 is engaged, and power is transmitted from the input shaft to the rear sun wheel P1;At the same time, the reverse brake F2 works, braking the rear row star carrier/front row inner gear ring PS1-C2, and the power is output from the rear row gear ring/front row star carrier PS2-C1. The power transmission route is shown in Figure 6.
It can be seen from the above analysis that only the rear planetary row transmits power in gear R, that is, n2H=0, and the substitution formula (2) has: i=n21/n23=- Z23/Z21=- 81/33 =-2.4545455
Since there is no one-way clutch in the shift actuating element of AL4 automatic transmission, engine braking is available in all gears.
Brand Specialty: (Keyword:Analysis of Power Transmission Route of Automatic Transmission Structure Maintenance of Dongfeng Citroen AL4 Automatic Transmission Vehicle)
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