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虎鹿鹿翻11ä¼ é»¼bookmark1Shijiazhuang Cao Limin Huang Gang transmission model A761EA760EA-automatic transmission A-automatic transmission 7-series 7-series 6-6 forward gear 6-6 forward gear 1 power transmission diagram fixed parts active parts driven Piece speed steering sun gear planet carrier ring gear growth rate same direction sun gear ring gear planet carrier deceleration same direction ring gear planet carrier sun gear growth rate same direction ring gear sun gear planet carrier deceleration same direction planet carrier ring gear sun gear speed increase Deceleration to the planet carrier sun gear ring gear reverse table 3 double-stage planetary gear mechanism movement law bookmark2 fixed parts active parts follower speed steering sun gear planet carrier ring gear deceleration same direction sun gear ring gear planet carrier speed increasing inter-tooth Ring planet carrier sun gear uncertain reverse ring gear sun gear planet carrier uncertain reverse planet carrier ring gear sun gear growth rate same direction planet carrier sun gear ring gear deceleration same direction table 4 actuator function bookmark3 A76/76)E Internal section view of the automatic transmission There are three planetary gear mechanisms in the A760/761E automatic transmission. The front row is a two-stage planetary gear mechanism, and the middle and rear rows are single-stage planetary gear mechanisms. The connection relationship of the three planetary rows is: the front and middle rows of ring gears are connected together; the middle row of planet carriers are connected with the rear row of ring gears; the middle row and the rear row of planetary gear mechanisms share one sun wheel; The planet carrier of the star gear mechanism is the power output. Due to the different motion laws of the single-stage planetary gear mechanism and the motion law of the two-stage planetary gear mechanism, in order to facilitate the reader to better understand the power transmission route analysis, the motion gauge shifting actuator functions of the single-stage and double-stage planetary gear mechanisms are respectively used. Clutch No. 1 C1 is connected to the input shaft and intermediate shaft (when F4 is locked) No. 2 clutch C2 is connected to the input shaft and the central planetary carrier No. 3 clutch C3 is connected to the input shaft and the front sun gear No. 4 clutch C4 is connected to the input shaft and the intermediate shaft. Brake No. 1 B1 prevents the front carrier from rotating clockwise and counterclockwise. Brake No. 2 B2 prevents the front ring gear and the center ring gear from rotating clockwise and counterclockwise. No. 3 brake B3 prevents the outer race of F2 from rotating clockwise and counterclockwise. Brake No. 4 B4 prevents the rear ring gear from rotating clockwise and counterclockwise. No. 1 one-way clutch F1 prevents the front carrier from rotating counterclockwise. No. 2 one-way clutch F2 prevents the front sun gear from rotating counterclockwise when the B3 is working. Clutch F3 prevents the center planet carrier and the rear ring gear from rotating counterclockwise. No. 4 one-way clutch F4 prevents the countershaft from rotating counterclockwise. From the above analysis, the three planetary gears in front, middle and rear are all in the third gear. The qualitative analysis of the speed ratio relative to the 2nd gear can be understood as follows: in 2nd and 3rd gears.
The state of the shared sun gear is the same: the front/intermediate ring gear is fixed in the 2nd gear, and the front/intermediate ring gear rotates in the same direction in the 3rd gear. Therefore, the intermediate carrier/rear ring gear in the 3rd gear is faster than the 2nd gear. The rear carrier speed (output) is faster than the second gear.
The four 4-speed power transmission route is as shown. At the fourth gear, the clutch C1 is engaged. The one-way clutch F4 is locked to drive the middle/rear row to share the sun gear; the clutch C2 works to drive the middle row carrier/rear ring gear, and the sun gear and the ring gear in the rear planetary gear mechanism are simultaneously driven by the input shaft speed . Then, the entire rear planetary gear mechanism rotates in one piece. When the transmission ratio is 1:1.4, only the rear planetary gear mechanism participates in power transmission.
It can be seen from the above power transmission route analysis that the one-way clutch F4 lock at the fourth gear is an indispensable condition for power transmission. When the power is reversed. F4 will be in a state of overrunning, so there is no Engine braking. When engine braking is required. Clutch C4 works.
Directly drive the middle/rear row to share the sun gear. The one-way clutch F4 lock is no longer an indispensable condition for power transmission. Therefore, there is engine braking. The five 5-speed power transmission route is as shown. In order to be clear, the states of the planetary gear mechanisms are as follows: > Front planetary gear mechanism: Clutch C3 works. The sun gear that drives the front planetary gear mechanism; brake B1 operates. Fix the front row of planet carriers, as shown in Table 3. The front row of ring gears rotates in the same direction.
> Intermediate planetary gear mechanism: Clutch C2 is engaged. The middle row carrier/rear ring gear is driven to rotate at the input shaft speed; the front row is connected with the middle row gear ring, and is rotated in the same direction as the input shaft, and the middle row/rear row share the sun gear in the same direction. Speed ​​rotation.
Rear planetary gear mechanism: clutch C2 is engaged, driving the middle row carrier/rear ring gear to rotate at the input shaft speed; the middle/rear row shares the sun gear in the same direction. Then the planet carrier rotates in the same direction (output). It is an overdrive.
It can be known from the above analysis. 5 blocks before and after. The latter three planetary platoons are involved in power transmission, and there is no one-way clutch to participate in power transmission, so there is engine braking.
Six-speed 6-speed power transmission path intermediate planetary gear mechanism: clutch C2 is engaged. The middle row carrier/rear ring gear is driven to rotate at the input shaft speed: brake B2 works to fix the middle row gear ring. Then the middle row/rear row share the sun gear to rotate in the same direction.
Rear planetary gear mechanism: clutch C2 is engaged, driving the middle row carrier/rear ring gear to rotate at the input shaft speed: the middle row/rear row share the sun gear in the same direction to increase the speed, then the planet carrier rotates in the same direction ( Output). It is an overdrive.
There is no one-way clutch involved in power transmission due to the 6th gear. Therefore, there is engine braking.
It can be seen from the above analysis that there is only medium in the 6th gear. The latter two planetary platoons are involved in power transmission. The qualitative analysis of the speed ratio relative to the 5th gear can be understood as follows: the intermediate planetary gear mechanism: in the 5th and 6th gears. The middle row of planet carriers rotates at the input shaft speed. Only the state of the ring gear is different. When the 6th gear is fixed, the middle gear ring is fixed, and the common sun gear rotates at a faster speed. When the 5th gear is in the same direction, the middle gear ring rotates in the same direction as the input shaft. The common sun gear is also the speed increasing rotation, but the speed is slower than the 6th gear.
(2> Rear planetary row: In the 5th and 6th gears, the rear gear ring rotates at the input shaft speed. The common sun gear rotates in the same direction. But in the 6th gear, the shared sun gear rotates faster than the 5th gear. Therefore, the speed of the planet carrier (output shaft) is faster than that of the 5th gear at 6th gear.
Seven. The reverse gear power transmission route is shown as 0. To be able to express clearly. The states of the planetary gear mechanisms are respectively described as follows: 0 reverse power transmission route n) front planetary gear mechanism: clutch C3 is engaged, driving the sun gear of the front planetary gear mechanism; one-way clutch F1 is locked, before one-way fixing Row of planet carriers. As can be seen from Table 3, the front row ring gear rotates in the same direction.
Intermediate planetary gear mechanism: the front and rear ring gears are connected together and rotate in the same direction: brake B4 works to fix the intermediate carrier/rear ring gear; then the common sun gear is reversed (with the input shaft speed direction) Compared to the speed increase rotation.
Rear planetary gear mechanism: The common sun gear rotates in the reverse speed; the brake B4 works to fix the intermediate carrier/rear ring gear. Then the rear row of the planet carrier is in the same direction (1 deceleration rotation (output) compared with the direction of the common sun gear rotation. The total speed and direction of the rear row planet carrier (output end) compared with the input shaft is: reverse deceleration rotation (output) .
In reverse gear. The front and rear planetary gear mechanisms are performing the same direction deceleration motion: the intermediate planetary gear mechanism is doing the reverse speed increasing motion.
It can be known from the above power transmission route analysis. In reverse gear. The one-way clutch F1 lock is an indispensable condition for power transmission. When the power is reversed. F1 will be in a state of overrunning. Therefore there is no engine braking. When the engine brake is required, the brake B1 works, the front-end planetary carrier is fixed in both directions, and the one-way clutch F1 lock is no longer an indispensable condition for power transmission, so there is engine braking.
Analysis of power transmission route of Toyota A760761E automatic transmission