CN107269780B - Automatic transmission - Google Patents

Abstract

The invention relates to the field of transmissions, and discloses a nine-speed automatic transmission which adopts 4 planetary rows and 6 gear-shifting operation elements (comprising 5 clutches and 1 brake) to realize 9 forward gears and 1 reverse gear; the adoption of more clutches (5) is beneficial to the nesting design of the clutches, so that the whole mechanism is more compact, and the more clutches (5) are beneficial to cutting off the connection relation among the planet rows under a specific gear, so that the redundant planet rows do not participate in the rotation, the dragging torque is reduced, the oil stirring loss of the belt rows is reduced, and the efficiency is improved; in addition, more clutches facilitate later speed range expansion by adding planetary rows or more operating members.

Description

Automatic Transmission

technical field

The invention relates to the field of transmissions, in particular to an automatic transmission.

Background technique

The transmission mechanism of the multi-stage automatic transmission generally includes a plurality of planetary rows, and the power of the engine is transmitted to the planetary row transmission mechanism through the hydraulic torque converter to be output after being shifted. The volume, weight, efficiency and carrying capacity of the automatic transmission are directly related to the planetary mechanism.

The more transmission gears of the automatic transmission, the lower the fuel consumption of the car and the better the economy, but as the number of gears increases, the number of planetary rows and the number of operating clutches and brakes also increase, satisfying the theoretical level ratio The design is even more difficult to realize. People have been seeking to form a planetary gear transmission mechanism with fewer planetary gears, clutches and brakes, so as to meet the needs of automobiles with compact structure, high strength, high efficiency and more gears.

At present, the nine-speed automatic transmission mechanism scheme in the passenger car market includes the combination of four planetary rows, four clutches and two brakes; the combination of four planetary rows, three clutches and three brakes or the combination of four planetary rows with Lavina structure. Among them, since the brake is finally connected to the case by friction steel teeth, the existence of the brake increases the difficulty of processing and manufacturing the case, and results in a more complicated transmission structure; and because the case material is generally aluminum alloy, more brakes Undoubtedly, it will cause difficulties in lightweight design while ensuring strength. However, the way of adopting the Lavina structure is more complicated in structure, which is not conducive to lightweight.

Contents of the invention

The purpose of the present invention is to provide an automatic transmission that can realize nine-speed gears, has a compact structure, is easy to process and manufacture, has high efficiency, and is conducive to realizing more speed extensions.

In order to achieve the above object, the present invention provides an automatic transmission, which includes a power input member, a power output member, 4 planetary rows, 5 clutches and 1 brake, each of which includes a sun gear, a planetary gear, a planetary rack and ring gear, the four planetary rows are the first planetary row, the second planetary row, the third planetary row and the fourth planetary row, and the five clutches are the first clutch, the second clutch, the third Clutches, fourth clutches and fifth clutches;

The first clutch is connected between any two of the sun gear, the planet carrier and the ring gear of the first planetary row;

The planetary carrier of the first planetary row is connected with the brake, and the planetary carrier of the first planetary row is connected with the ring gear of the second planetary row through the second clutch, and the planetary carrier of the first planetary row The ring gear is connected to the planet carrier of the second planet row, and the sun gear of the first planet row is connected to the planet carrier of the fourth planet row;

The sun gear of the second planetary row is fixed as a whole after being connected with the ring gear of the third planetary row;

The sun gear of the third planetary row is integrally connected between the second clutch and the ring gear of the second planetary row after being connected with the sun gear of the fourth planetary row;

The power input member is connected to the sun gear of the first planetary row, the planet carrier of the third planetary row is connected to the power output member of the transmission through the fourth clutch, and the power output member of the transmission Also connected with the ring gear of the fourth planetary row;

The fifth clutch is connected with the fourth planetary row, and is used to enable the fourth planetary row to participate in power transmission when closed;

The third clutch is connected between the ring gear of the first planetary row and the carrier of the second planetary row, or the third clutch is connected between the second clutch and the second planetary row between ring gears;

When the third clutch is connected between the second clutch and the ring gear of the second planetary row, the sun gear of the third planetary row is integrally connected with the sun gear of the fourth planetary row between the second clutch and the third clutch.

As a preferred solution, the sun gear of the first planetary row is directly connected to the planet carrier of the fourth planetary row, and the power output member of the transmission is connected to the ring gear of the fourth planetary row through the fifth clutch .

As a preferred solution, the sun gear of the first planetary row is connected to the planet carrier of the fourth planetary row through the fifth clutch, and the power output member of the transmission is directly connected to the ring gear of the fourth planetary row .

As a preferred solution, the sun gear of the third planetary row is fixedly connected to the sun gear of the fourth planetary row by means of splines or welding.

As a preferred solution, the sun gear of the second planetary row is fixedly connected to the ring gear of the third planetary row by means of splines or welding.

As a preferred solution, one end of the brake is connected to the case of the gearbox, and the other end of the brake is connected to the planet carrier of the first planetary row.

As a preferred solution, after the sun gear of the second planetary row is connected with the ring gear of the third planetary row, it is integrally fixedly connected with the case of the gearbox.

As a preferred solution, after the sun gear of the second planetary row is connected with the ring gear of the third planetary row, the whole is fixedly connected with the case of the gearbox through splines or welding.

The automatic transmission provided by the present invention can realize 9 forward gears and 1 reverse gear by adopting 4 planetary rows and 6 shift operating elements (which include 5 clutches and 1 brake) in combination, compared with using the same number of For a transmission with shifting operating elements (6), the reduction in the number of brakes reduces the difficulty of manufacturing the case, which is conducive to the lightweight of the entire transmission; and the use of more clutches (5) is conducive to the nesting design of clutches, making The whole mechanism is more compact, and more clutches (5) are beneficial to cut off the connection relationship between the planetary rows in a specific gear, so that the redundant planetary rows do not participate in the rotation, reduce the drag torque, and reduce the oil churning loss of the belt row , improve efficiency; in addition, more clutches are conducive to the expansion of more speed gears by adding planetary rows or adding more operating parts in the future.

Description of drawings

Fig. 1 is the schematic diagram of the first preferred embodiment of automatic transmission of the present invention;

Fig. 2 is the schematic diagram of the second preferred embodiment of the automatic transmission of the present invention;

Fig. 3 is the schematic diagram of the third preferred embodiment of the automatic transmission of the present invention;

Fig. 4 is the schematic diagram of the fourth preferred embodiment of the automatic transmission of the present invention;

Fig. 5 is the schematic diagram of the fifth preferred embodiment of the automatic transmission of the present invention;

Fig. 6 is the schematic diagram of the sixth preferred embodiment of the automatic transmission of the present invention;

Fig. 7 is a schematic diagram of the seventh preferred embodiment of the automatic transmission of the present invention;

Fig. 8 is a schematic diagram of an eighth preferred embodiment of the automatic transmission of the present invention.

Among them, 1, the first planetary row; 1-1, the sun gear of the first planetary row; 1-2, the planetary wheel of the first planetary row; 1-3, the planet carrier of the first planetary row; 1-4, the first planetary row The ring gear of the first planetary row; 2, the second planetary row; 2-1, the sun gear of the second planetary row; 2-2, the planetary gear of the second planetary row; 2-3, the planet carrier of the second planetary row; 2-4, the ring gear of the second planetary row; 3, the third planetary row; 3-1, the sun gear of the third planetary row; 3-2, the planetary gear of the third planetary row; 3-3, the third planet 3-4, the ring gear of the third planetary row; 4, the fourth planetary row: 4-1, the sun gear of the fourth planetary row; 4-2, the planetary gear of the fourth planetary row; 4- 3. The planet carrier of the fourth planetary row; 4-4. The ring gear of the fourth planetary row; 5. The first clutch; 6. The second clutch; 7. The third clutch; 8. The fourth clutch; 9. The fifth clutch; 10, brake; 11, box body; 12, power input component; 13, power output component.

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

Example 1

As shown in Figure 1, the automatic transmission of the preferred embodiment of the present invention comprises a power input member 12, a power output member 13, four planetary rows, five clutches and a brake 10, and each planetary row includes a sun gear, a planetary gear , planet carrier and ring gear, the four planetary rows are the first planetary row 1, the second planetary row 2, the third planetary row 3 and the fourth planetary row 4, and the five clutches are the first clutch 5 and the second clutch 6. The third clutch 7, the fourth clutch 8 and the fifth clutch 9;

The first clutch 5 can be connected between any two parts in the sun gear 1-1 of the first planetary row, the planet carrier 1-3 and the ring gear 1-4; in this embodiment, the first clutch 5 Connected between the planetary carrier 1-3 of the first planetary row 1 and the ring gear 1-4;

The planetary carrier 1-3 of the first planetary row is connected with the brake 10, and the planetary carrier 1-3 of the first planetary row is connected with the ring gear 2-4 of the second planetary row through the second clutch 6, and the teeth of the first planetary row Ring 1-4 is connected to the planetary carrier 2-3 of the second planetary row, the sun gear 1-1 of the first planetary row is connected to the planetary carrier 4-3 of the fourth planetary row, specifically, the ring gear of the first planetary row 1-4 can be directly connected with the planetary carrier 2-3 of the second planetary row, or the ring gear 1-4 of the first planetary row can be connected with the planetary carrier 2-3 of the second planetary row through a clutch; similarly, the first The sun gear 1-1 of the planet row can be directly connected to the planet carrier 4-3 of the fourth planet row, or the sun gear 1-1 of the first planet row can be connected to the planet carrier 4-3 of the fourth planet row through a clutch;

The sun gear 2-1 of the second planetary row is connected to the ring gear 3-4 of the third planetary row and fixed as a whole;

The sun gear 3-1 of the third planetary row is connected to the sun gear 4-1 of the fourth planetary row and then integrally connected between the second clutch 6 and the ring gear 2-4 of the second planetary row;

The power input member 12 is connected with the sun gear 1-1 of the first planetary row, the planet carrier 3-3 of the third planetary row is connected with the power output member 13 of the transmission through the fourth clutch 8, and the power output member 13 of the transmission is also connected with The ring gear of the fourth planetary row is connected 4-4;

The fifth clutch 9 is connected with the fourth planetary row 4, and is used to make the fourth planetary row 4 participate in power transmission when closed; specifically, in this embodiment, the fifth clutch 9 is connected with the power output member 13 and the fourth planetary row between ring gears 4-4 of the row.

The third clutch 7 is connected between the ring gear 1-4 of the first planetary row and the carrier 2-3 of the second planetary row, or the third clutch 7 is connected between the second clutch 6 and the ring gear 2 of the second planetary row Between -4;

When the third clutch 7 is connected between the second clutch 6 and the ring gear 2-4 of the second planetary row, the sun gear 3-1 of the third planetary row is connected with the sun gear 3-1 of the fourth planetary row It is connected between the second clutch 6 and the third clutch 7; in this embodiment, the third clutch 7 is connected between the ring gear 1-4 of the first planet row and the planet carrier 2-3 of the second planet row.

Based on the combination of the above-mentioned planetary row, multiple clutches and brakes, the automatic transmission can realize 9 forward gears and 1 reverse gear. It reduces the manufacturing difficulty of the case, which is beneficial to the lightweight of the entire transmission; and the use of more clutches (5) is conducive to the nesting design of the clutches, making the whole mechanism more compact, and more clutches (5) have It is beneficial to cut off the connection relationship between the planetary rows in a specific gear, so that the redundant planetary row does not participate in the rotation, reduces the drag torque, reduces the oil churning loss with the row, and improves efficiency; row or add more operating parts to expand more speed gears.

In this embodiment, there are six shifting operating elements, which are respectively the first clutch 5, the second clutch 6, the third clutch 7, the fourth clutch 8, the fifth clutch 9 and the brake 10. During use, as shown in Table 1 As shown, 9 forward gears and 1 reverse gear can be realized by combining 3 shifting operating elements at the same time, the characteristic parameters of the first planetary row 1, the second planetary row 2, the third planetary row 3 and the fourth planetary row 4 The ratio of the number of teeth of the ring gear to the sun gear of each planetary row is respectively, and the characteristic parameters of the four planetary rows are recorded as k1, k2, k3 and k4 in turn.

Table 1 9-speed shift operation logic table

The specific gear is realized as follows:

(1) When the second clutch 6, the third clutch 7 and the fourth clutch 8 are closed, the 1st gear is realized. In this gear, the closing of the second clutch 6 and the third clutch 7 makes the first planetary row 1 and the second planetary row The second planetary row 2 realizes single-degree-of-freedom output, and the speed ratio realized by the first planetary row 1 and the second planetary row 2 is (1+k1+k2)/(1+k2), and then the fourth clutch 8 is closed, and the second Three planetary row 3 outputs, and the speed ratio realized by the third planetary row 3 is (k3+1), so the 1st gear speed ratio is i1=(1+k1+k2)*(K3+1)/(1+K2). The power transmission route of the first gear is: input from the sun gear 1-1 of the first planetary row → one-stage deceleration through the first and second planetary row → two-stage deceleration through the third planetary row → four-clutch 8 → output.

(2) When the first clutch 5, the second clutch 6 and the fourth clutch 8 are closed, the 2nd gear is realized. Under this gear position, the closing of the first clutch 5 makes the first planetary row become a rotary whole to participate in the transmission, and then Through the closing of the second clutch 6, it is connected in series to the third planetary row 3, and the speed ratio realized by the third planetary row 3 is (k3+1), and then connected to the power output member 13 through the closing of the fourth clutch 8 to realize the power output, and finally 2 The speed ratio of the gear is i2=K3+1. The power transmission route of the second gear is: input from the sun gear 1-1 of the first planetary row → through the first planetary row to rotate the whole → through the second clutch 6 → through the third planetary row Carry out deceleration → through the 4th clutch 8 → output.

(3) When the first clutch 5, the third clutch 7 and the fourth clutch 8 are closed, the 3rd gear is realized. Under this gear position, the closing of the first clutch 5 makes the first planetary row become a rotary whole to participate in the transmission, and then Through the closing of the third clutch 7, it is connected in series to the second planetary row 2, and the second planetary row 2 realizes the speed-up ratio of k2/(1+k2), and then is connected in series to the third planetary row 3, and the speed achieved by the third planetary row 3 The ratio is (k3+1), and then the fourth clutch 8 is closed and connected to the power output member 13 to realize the power output. The speed ratio of the final third gear is i3=(k3+1)*k2/(1+k2). The power transmission route of the 3rd gear is: input from the sun gear 1-1 of the first planetary row → turn the whole through the first planetary row 1 → pass through the third clutch 7 → transfer to the second planetary row 2 for speed up → pass through the third planetary row Row carries out deceleration → through the 4th clutch 8 → output.

(4) When the third clutch 7, the fourth clutch 8 and the fifth clutch 9 are closed, the 4th gear is realized. In this gear, the first planetary row 1 and the second planetary row 2 are idling, and the fourth clutch 8 and the The five-clutch 9 is closed so that the third planetary row 3 and the fourth planetary row 4 realize single-degree-of-freedom output, and the speed ratio realized by the third planetary row 3 and the fourth planetary row 4 is (1+k3+k4)/(k4+1 ), wherein the closing of the third clutch 7 is in order to satisfy the shift logic of only switching a single operating element for shifting between adjacent gears, and the speed ratio of the final 4th gear is i4=(1+k3+k4)/(k4 +1). The power transmission route of the 4th gear is: input from the planetary carrier 4-3 of the fourth planetary row → deceleration through the third planetary row 3 and the fourth planetary row 4 → output.

(5) When the first clutch 5, the third clutch 7 and the fifth clutch 9 are closed, the 5th gear is realized. Under this gear, the closing of the first clutch 5 makes the first planetary row 1 become a rotary whole to participate in the transmission, Then, through the closing of the third clutch 7, it is connected in series to the second planetary row 2. Since the sun gear 2-1 of the second planetary row is constantly braked, the second planetary row can achieve a single-degree-of-freedom speed-up output, and its speed-up ratio is 1. /(1+K2), after being output by the second planetary row 2, as a power tributary, it is passed into the fourth planetary row through the sun gear 4-1 of the fourth planetary row, and another power tributary is transmitted from the planet carrier 4 of the fourth planetary row -3 input, finally, the fifth clutch 9 is closed and connected to the power output member 13 to realize the power output, and the speed ratio of the final fifth gear is i5=k2*k4/(k2*k4-1). There are two power transmission routes for the 5th gear, which are:

a. Input from the sun gear 1-1 of the first planetary row → turn the whole through the first planetary row 1 → pass through the third clutch 7 → speed up through the second planetary row 2 → go through the sun gear 4-1 of the fourth planetary row Passed into the fourth planetary row 1 → through the planetary gear 4-2 of the fourth planetary row → through the ring gear 4-4 of the fourth planetary row → through the fifth clutch 9 → output;

b. The planetary carrier 4-3 of the fourth planetary row is input → the planetary wheel 4-2 of the fourth planetary row → the ring gear 4-4 of the fourth planetary row → the fifth clutch 9 → output.

(6) When the first clutch 5, the second clutch 6 and the fifth clutch 9 are closed, the 6th gear is realized. In this gear, the closing of the first clutch 5 and the second clutch 6 makes the first planetary row 1 and the second planetary row The four planetary rows 4 become a rotating whole to participate in the transmission, the fifth clutch 9 is closed and connected to the power output member 13 to realize the power output, and the speed ratio of the final 6th gear is i6=1. The power transmission route of the 6th gear is: the first and the fourth Planetary row overall input→fifth clutch 9→output.

(7) When the second clutch 6, the third clutch 7 and the fifth clutch 9 are closed, the 7th gear is realized. Under this gear position, due to the constant braking of the sun gear 2-1 of the second planetary row, the second clutch 6 The closing of the third clutch 7 makes the first planetary row 1 and the second planetary row 2 realize single-degree-of-freedom output, and the speed ratio realized by the first planetary row 1 and the second planetary row 2 is (1+k1+k2)/( 1+k2), after being output by the second planetary row 2, it is passed into the fourth planetary row as a power tributary through the sun gear 4-1 of the fourth planetary row, and another power tributary is transmitted from the planet carrier 4-3 of the fourth planetary row Input, finally, the fifth clutch 9 is closed and connected to the power output member 13 to realize the power output, and the speed ratio of the final 7th gear is i7=(k4+k1*k4+k2*k4)/(k4+k1*k4+k2* k4+k1). There are two power transmission routes for the 7th gear, which are:

(a) Input from the sun gear 1-1 of the first planetary row → decelerate through the first and second planetary rows → pass into the fourth planetary row 4 through the sun gear 4-1 of the fourth planetary row → pass through the fourth planetary row Planetary gear 4-2 → through the ring gear 4-4 of the fourth planetary row → through the fifth clutch 9 → output;

(b) Input from the planet carrier 4-3 of the fourth planetary row → through the planetary wheel 4-2 of the fourth planetary row → through the ring gear 4-4 of the fourth planetary row → through the fifth clutch 9 → output.

(8) When the brake 10, the second clutch 6 and the fifth clutch 9 are closed, the 8th gear is realized. In this gear, the closing of the brake 10 and the second clutch 6 makes the fourth planetary row brake, thereby realizing the 8th gear. The four-planet row 4 performs single-degree-of-freedom output, and its speed-up ratio is k4/(k4+1). After the fifth clutch 9 is closed and connected to the power output member 13 to realize power output, the speed ratio of the final 8th gear is i8=k4 /(k4+1). The power transmission route of the 8th gear is: input from the sun gear 4-1 of the fourth planetary row → speed up through the fourth planetary row → output through the fifth clutch 9 → output.

(9) When the brake 10, the third clutch 7 and the fifth clutch 9 are closed, the 9th gear is realized. In this gear, the closing of the brake 10 makes the first planetary row 1 realize a single-degree-of-freedom output, and generates a negative Reduction ratio -k1, and then connected in series to the second planetary row 2 through the third clutch 7 closed, because the sun gear 2-1 of the second planetary row is always braked, so that the second planetary row 2 also realizes single-degree-of-freedom output, which realizes The speed ratio of the first planetary row and the second planetary row is k2*(1+k2), so the speed ratio realized by the first planetary row and the second planetary row is -k1*k2*(1+k2), and the output of the second planetary row is used as a power tributary by The sun gear 4-1 of the fourth planetary row is transmitted to the fourth planetary row, and another branch of power is input from the planetary carrier 4-3 of the fourth planetary row. Finally, the fifth clutch 9 is closed and connected to the power output member 13 to realize power Output, the speed ratio of the final 9th gear is i9=k1*k2*k4/(k1*k2*k4+k1*k2+k2+1). There are 2 power transmission routes for the 9th gear, which are:

(a) Input from the sun gear 1-1 of the first planetary row → negative deceleration through the first planetary row → speed up through the second planetary row → input into the fourth planet through the sun gear 4-1 of the fourth planetary row row → through the planetary gear 4-2 of the fourth planetary row → through the ring gear 4-4 of the fourth planetary row → through the fifth clutch 9 → output;

(b) Input from the planet carrier 4-3 of the fourth planetary row → through the planetary gear 4-2 of the fourth planetary row → through the ring gear 4-4 of the fourth planetary row → through the fifth clutch 9 → output.

(10) When the brake 10, the third clutch 7 and the fourth clutch 8 are closed, the R gear is realized. In this gear, the closing of the brake 10 enables the first planetary row 1 to realize a single-degree-of-freedom output, and its output negative deceleration ratio -k1, and then connect it to the second planetary row in series through the closing of the third clutch 7, because the sun gear 2-1 of the second planetary row and the ring gear 3-4 of the third planetary row are constantly braked, so that the second planetary row Both the second planetary row and the third planetary row can achieve single-degree-of-freedom output, wherein the second planetary row realizes a series input speed-up ratio of k2/(1+k2), and the third planetary row realizes a series-in deceleration ratio of (1+k3), Then, the fourth clutch 8 is closed and connected to the power output member 13 to realize the power output, and finally the speed ratio of the R gear is iR=-(k3+1)*k2*k1/(1+k2). The power transmission route of gear R is: input from the sun gear 1-1 of the first planetary row → negative deceleration through the first planetary row 1 → through the third clutch 7 → speed up through the second planetary row 2 → through the second planetary row 2 The three planetary rows 3 decelerate → through the fourth clutch 8 → output.

As a preferred solution, the sun gear 3-1 of the third planetary row is fixedly connected to the sun gear 4-1 of the fourth planetary row through splines or welding, and the sun gear 2-1 of the second planetary row is connected to the third planetary row The ring gears 3-4 are fixedly connected by splines or welding.

One end of the brake 10 is connected to the case 11 of the gearbox, and the other end is connected to the planet carrier 1-3 of the first planetary row; the sun gear 2-1 of the second planetary row is connected to the ring gear 3-4 of the third planetary row The rear whole is fixedly connected with the box body 11 of the gearbox, and is directly fixedly connected to the box body 11 through the whole body, so that there is no need to set a brake at the connection, so as to avoid impact on the box body 11 during the shifting process, thereby improving the box body. 11, preferably, the sun gear 2-1 of the second planetary row is connected with the ring gear 3-4 of the third planetary row, and then the whole is fixed with the case 11 of the gearbox by spline or welding connect.

Example 2

As shown in Figure 2, the automatic transmission of another preferred embodiment of the present invention includes a power input member 12, a power output member 13, four planetary rows, five clutches and a brake 10, and each planetary row includes a sun gear, Planetary gear, planet carrier and ring gear, the four planetary rows are the first planetary row 1, the second planetary row 2, the third planetary row 3 and the fourth planetary row 4, and the five clutches are the first clutch 5, the Second clutch 6, third clutch 7, fourth clutch 8 and fifth clutch 9;

The first clutch 5 is connected between the planetary carrier 1-3 of the first planetary row 1 and the sun gear 1-1;

The planetary carrier 1-3 of the first planetary row is connected with the brake 10, and the planetary carrier 1-3 of the first planetary row is connected with the ring gear 2-4 of the second planetary row through the second clutch 6, and the teeth of the first planetary row Ring 1-4 is connected to the planet carrier 2-3 of the second planet row through the third clutch 7, and the sun gear 1-1 of the first planet row is directly connected to the planet carrier 4-3 of the fourth planet row;

The sun gear 2-1 of the second planetary row is connected to the ring gear 3-4 of the third planetary row and fixed as a whole;

The sun gear 3-1 of the third planetary row is connected to the sun gear 4-1 of the fourth planetary row and then integrally connected between the second clutch 6 and the ring gear 2-4 of the second planetary row;

The power input member 12 is connected with the sun gear 1-1 of the first planetary row, the planet carrier 3-3 of the third planetary row is connected with the power output member 13 through the fourth clutch 8, and the power output member 13 is also connected with the fifth clutch 9 It is connected with the ring gear 4-4 of the fourth planetary row, so that when the fifth clutch 9 is closed, the fourth planetary row 4 can participate in power transmission.

Based on the combination of the above-mentioned planetary row, multiple clutches and brakes, the automatic transmission can realize 9 forward gears and 1 reverse gear. It reduces the manufacturing difficulty of the case, which is beneficial to the lightweight of the entire transmission; and the use of more clutches (5) is conducive to the nesting design of the clutches, making the whole mechanism more compact, and more clutches (5) have It is beneficial to cut off the connection relationship between the planetary rows in a specific gear, so that the redundant planetary row does not participate in the rotation, reduces the drag torque, reduces the oil churning loss with the row, and improves efficiency; row or add more operating parts to expand more speed gears.

The specific gear realization form of this embodiment is consistent with that of Embodiment 1.

As a preferred solution, the sun gear 3-1 of the third planetary row is fixedly connected to the sun gear 4-1 of the fourth planetary row through splines or welding, and the sun gear 2-1 of the second planetary row is connected to the third planetary row The ring gears 3-4 are fixedly connected by splines or welding.

One end of the brake 10 is connected to the case 11 of the gearbox, and the other end is connected to the planet carrier 1-3 of the first planetary row; the sun gear 2-1 of the second planetary row is connected to the ring gear 3-4 of the third planetary row The rear whole is fixedly connected with the box body 11 of the gearbox, and is directly fixedly connected to the box body 11 through the whole body, so that there is no need to set a brake at the connection, so as to avoid impact on the box body 11 during the shifting process, thereby improving the box body. 11, preferably, the sun gear 2-1 of the second planetary row is connected with the ring gear 3-4 of the third planetary row, and then the whole is fixed with the case 11 of the gearbox by spline or welding connect.

Example 3

As shown in Figure 3, the automatic transmission of the third preferred embodiment of the present invention includes a power input member 12, a power output member 13, four planetary rows, five clutches and a brake 10, each planetary row includes a sun gear, Planetary gear, planet carrier and ring gear, the four planetary rows are the first planetary row 1, the second planetary row 2, the third planetary row 3 and the fourth planetary row 4, and the five clutches are the first clutch 5, the Second clutch 6, third clutch 7, fourth clutch 8 and fifth clutch 9;

The first clutch 5 is connected between the planetary carrier 1-3 of the first planetary row 1 and the ring gear 1-4;

The planetary carrier 1-3 of the first planetary row is connected with the brake 10, and the planetary carrier 1-3 of the first planetary row is connected with the ring gear 2-4 of the second planetary row through the second clutch 6, and the teeth of the first planetary row The ring 1-4 is connected with the planet carrier 2-3 of the second planet row through the third clutch 7, and the sun gear 1-1 of the first planet row is connected with the planet carrier 4-3 of the fourth planet row through the fifth clutch 9, This enables the fourth planetary row 4 to participate in power transmission when the fifth clutch 9 is closed.

The sun gear 2-1 of the second planetary row is connected to the ring gear 3-4 of the third planetary row and fixed as a whole;

The sun gear 3-1 of the third planetary row is connected to the sun gear 4-1 of the fourth planetary row and then integrally connected between the second clutch 6 and the ring gear 2-4 of the second planetary row;

The power input member 12 is connected with the sun gear 1-1 of the first planetary row, the planet carrier 3-3 of the third planetary row is connected with the power output member 13 through the fourth clutch 8, and the power output member 13 is also connected with the fourth planetary row The ring gear is connected 4-4.

Based on the combination of the above-mentioned planetary row, multiple clutches and brakes, the automatic transmission can realize 9 forward gears and 1 reverse gear. It reduces the manufacturing difficulty of the case, which is beneficial to the lightweight of the entire transmission; and the use of more clutches (5) is conducive to the nesting design of the clutches, making the whole mechanism more compact, and more clutches (5) have It is beneficial to cut off the connection relationship between the planetary rows in a specific gear, so that the redundant planetary row does not participate in the rotation, reduces the drag torque, reduces the oil churning loss with the row, and improves efficiency; row or add more operating parts to expand more speed gears.

The implementation form of each gear in this embodiment is consistent with that in Embodiment 1.

As a preferred solution, the sun gear 3-1 of the third planetary row is fixedly connected to the sun gear 4-1 of the fourth planetary row through splines or welding, and the sun gear 2-1 of the second planetary row is connected to the third planetary row The ring gears 3-4 are fixedly connected by splines or welding.

One end of the brake 10 is connected to the case 11 of the gearbox, and the other end is connected to the planet carrier 1-3 of the first planetary row; the sun gear 2-1 of the second planetary row is connected to the ring gear 3-4 of the third planetary row The rear whole is fixedly connected with the box body 11 of the gearbox, and is directly fixedly connected to the box body 11 through the whole body, so that there is no need to set a brake at the connection, so as to avoid impact on the box body 11 during the shifting process, thereby improving the box body. 11, preferably, the sun gear 2-1 of the second planetary row is connected with the ring gear 3-4 of the third planetary row, and then the whole is fixed with the case 11 of the gearbox by spline or welding connect.

Example 4

As shown in Figure 4, the automatic transmission of the fourth preferred embodiment of the present invention includes a power input member 12, a power output member 13, four planetary rows, five clutches and a brake 10, and each planetary row includes a sun gear, Planetary gear, planet carrier and ring gear, the four planetary rows are the first planetary row 1, the second planetary row 2, the third planetary row 3 and the fourth planetary row 4, and the five clutches are the first clutch 5, the Second clutch 6, third clutch 7, fourth clutch 8 and fifth clutch 9;

The first clutch 5 is connected between the planetary carrier 1-3 of the first planetary row 1 and the sun gear 1-1;

The planetary carrier 1-3 of the first planetary row is connected with the brake 10, and the planetary carrier 1-3 of the first planetary row is connected with the ring gear 2-4 of the second planetary row through the second clutch 6, and the teeth of the first planetary row The ring 1-4 is connected with the planet carrier 2-3 of the second planet row through the third clutch 7, and the sun gear 1-1 of the first planet row is connected with the planet carrier 4-3 of the fourth planet row through the fifth clutch 9, This enables the fourth planetary row 4 to participate in power transmission when the fifth clutch 9 is closed.

The sun gear 2-1 of the second planetary row is connected to the ring gear 3-4 of the third planetary row and fixed as a whole;

The sun gear 3-1 of the third planetary row is connected to the sun gear 4-1 of the fourth planetary row and then integrally connected between the second clutch 6 and the ring gear 2-4 of the second planetary row;

The power input member 12 is connected with the sun gear 1-1 of the first planetary row, the planet carrier 3-3 of the third planetary row is connected with the power output member 13 through the fourth clutch 8, and the power output member 13 is also connected with the fourth planetary row The ring gear is connected 4-4.

Based on the combination of the above-mentioned planetary row, multiple clutches and brakes, the automatic transmission can realize 9 forward gears and 1 reverse gear. It reduces the manufacturing difficulty of the case, which is beneficial to the lightweight of the entire transmission; and the use of more clutches (5) is conducive to the nesting design of the clutches, making the whole mechanism more compact, and more clutches (5) have It is beneficial to cut off the connection relationship between the planetary rows in a specific gear, so that the redundant planetary row does not participate in the rotation, reduces the drag torque, reduces the oil churning loss with the row, and improves efficiency; row or add more operating parts to expand more speed gears.

The implementation form of each gear in this embodiment is consistent with that in Embodiment 1.

As a preferred solution, the sun gear 3-1 of the third planetary row is fixedly connected to the sun gear 4-1 of the fourth planetary row through splines or welding, and the sun gear 2-1 of the second planetary row is connected to the third planetary row The ring gears 3-4 are fixedly connected by splines or welding.

One end of the brake 10 is connected to the case 11 of the gearbox, and the other end is connected to the planet carrier 1-3 of the first planetary row; the sun gear 2-1 of the second planetary row is connected to the ring gear 3-4 of the third planetary row The rear whole is fixedly connected with the box body 11 of the gearbox, and is directly fixedly connected to the box body 11 through the whole body, so that there is no need to set a brake at the connection, so as to avoid impact on the box body 11 during the shifting process, thereby improving the box body. 11, preferably, the sun gear 2-1 of the second planetary row is connected with the ring gear 3-4 of the third planetary row, and then the whole is fixed with the case 11 of the gearbox by spline or welding connect.

Example 5

As shown in Figure 5, the automatic transmission of the fifth preferred embodiment of the present invention includes a power input member 12, a power output member 13, four planetary rows, five clutches and a brake 10, and each planetary row includes a sun gear, Planetary gear, planet carrier and ring gear, the four planetary rows are the first planetary row 1, the second planetary row 2, the third planetary row 3 and the fourth planetary row 4, and the five clutches are the first clutch 5, the Second clutch 6, third clutch 7, fourth clutch 8 and fifth clutch 9;

The first clutch 5 is connected between the planetary carrier 1-3 of the first planetary row 1 and the ring gear 1-4;

The planetary carrier 1-3 of the first planetary row is connected with the brake 10, and the planetary carrier 1-3 of the first planetary row is connected with the ring gear 2-4 of the second planetary row through the second clutch 6 and the third clutch 7 in turn, The ring gear 1-4 of the first planet row is directly connected with the planet carrier 2-3 of the second planet row, and the sun gear 1-1 of the first planet row is directly connected with the planet carrier 4-3 of the fourth planet row;

The sun gear 2-1 of the second planetary row is connected to the ring gear 3-4 of the third planetary row and fixed as a whole;

The sun gear 3-1 of the third planetary row is connected to the sun gear 4-1 of the fourth planetary row and then integrally connected between the second clutch 6 and the third clutch 7;

The power input member 12 is connected with the sun gear 1-1 of the first planetary row, the planet carrier 3-3 of the third planetary row is connected with the power output member 13 through the fourth clutch 8, and the power output member 13 is also connected with the fifth clutch 9 It is connected with the ring gear 4-4 of the fourth planetary row, so that when the fifth clutch 9 is closed, the fourth planetary row 4 can participate in power transmission.

Based on the combination of the above-mentioned planetary row, multiple clutches and brakes, the automatic transmission can realize 9 forward gears and 1 reverse gear. The manufacturing difficulty of the case is reduced, which is beneficial to the lightweight of the entire transmission; and the use of more clutches (5) is conducive to the nesting design of the clutches, making the whole mechanism more compact, and more clutches (5) have It is beneficial to cut off the connection relationship between the planetary rows in a specific gear, so that the redundant planetary row does not participate in the rotation, reduces the drag torque, reduces the oil churning loss with the row, and improves efficiency; row or add more controls to expand more speed gears.

The implementation form of each gear in this embodiment is consistent with that in Embodiment 1.

As a preferred solution, the sun gear 3-1 of the third planetary row is fixedly connected to the sun gear 4-1 of the fourth planetary row through splines or welding, and the sun gear 2-1 of the second planetary row is connected to the third planetary row The ring gears 3-4 are fixedly connected by splines or welding.

One end of the brake 10 is connected to the case 11 of the gearbox, and the other end is connected to the planet carrier 1-3 of the first planetary row; the sun gear 2-1 of the second planetary row is connected to the ring gear 3-4 of the third planetary row The rear whole is fixedly connected with the box body 11 of the gearbox, and is directly fixedly connected to the box body 11 through the whole body, so that there is no need to set a brake at the connection, so as to avoid impact on the box body 11 during the shifting process, thereby improving the box body. 11, preferably, the sun gear 2-1 of the second planetary row is connected with the ring gear 3-4 of the third planetary row, and then the whole is fixed with the case 11 of the gearbox by spline or welding connect.

Example 6

As shown in Figure 6, the automatic transmission of the sixth preferred embodiment of the present invention includes a power input member 12, a power output member 13, four planetary rows, five clutches and a brake 10, and each planetary row includes a sun gear, Planetary gear, planet carrier and ring gear, the four planetary rows are the first planetary row 1, the second planetary row 2, the third planetary row 3 and the fourth planetary row 4, and the five clutches are the first clutch 5, the Second clutch 6, third clutch 7, fourth clutch 8 and fifth clutch 9;

The first clutch 5 is connected between the planetary carrier 1-3 of the first planetary row 1 and the sun gear 1-1;

The planetary carrier 1-3 of the first planetary row is connected with the brake 10, and the planetary carrier 1-3 of the first planetary row is connected with the ring gear 2-4 of the second planetary row through the second clutch 6 and the third clutch 7 in turn, The ring gear 1-4 of the first planet row is directly connected with the planet carrier 2-3 of the second planet row, and the sun gear 1-1 of the first planet row is directly connected with the planet carrier 4-3 of the fourth planet row;

The sun gear 2-1 of the second planetary row is connected to the ring gear 3-4 of the third planetary row and fixed as a whole;

The sun gear 3-1 of the third planetary row is connected to the sun gear 4-1 of the fourth planetary row and then integrally connected between the second clutch 6 and the third clutch 7;

The power input member 12 is connected with the sun gear 1-1 of the first planetary row, the planet carrier 3-3 of the third planetary row is connected with the power output member 13 through the fourth clutch 8, and the power output member 13 is also connected with the fifth clutch 9 It is connected with the ring gear 4-4 of the fourth planetary row, so that when the fifth clutch 9 is closed, the fourth planetary row 4 can participate in power transmission.

Based on the combination of the above-mentioned planetary row, multiple clutches and brakes, the automatic transmission can realize 9 forward gears and 1 reverse gear. It reduces the manufacturing difficulty of the case, which is beneficial to the lightweight of the entire transmission; and the use of more clutches (5) is conducive to the nesting design of the clutches, making the whole mechanism more compact, and more clutches (5) have It is beneficial to cut off the connection relationship between the planetary rows in a specific gear, so that the redundant planetary row does not participate in the rotation, reduces the drag torque, reduces the oil churning loss with the row, and improves efficiency; row or add more controls to expand more speed gears.

The implementation form of each gear in this embodiment is consistent with that in Embodiment 1.

As a preferred solution, the sun gear 3-1 of the third planetary row is fixedly connected to the sun gear 4-1 of the fourth planetary row through splines or welding, and the sun gear 2-1 of the second planetary row is connected to the third planetary row The ring gears 3-4 are fixedly connected by splines or welding.

One end of the brake 10 is connected to the case 11 of the gearbox, and the other end is connected to the planet carrier 1-3 of the first planetary row; the sun gear 2-1 of the second planetary row is connected to the ring gear 3-4 of the third planetary row The rear whole is fixedly connected with the box body 11 of the gearbox, and is directly fixedly connected to the box body 11 through the whole body, so that there is no need to set a brake at the connection, so as to avoid impact on the box body 11 during the shifting process, thereby improving the box body. 11, preferably, the sun gear 2-1 of the second planetary row is connected with the ring gear 3-4 of the third planetary row, and then the whole is fixed with the case 11 of the gearbox by spline or welding connect.

Example 7

As shown in Figure 7, the automatic transmission of the seventh preferred embodiment of the present invention includes a power input member 12, a power output member 13, four planetary rows, five clutches and a brake 10, and each planetary row includes a sun gear, Planetary gear, planet carrier and ring gear, the four planetary rows are the first planetary row 1, the second planetary row 2, the third planetary row 3 and the fourth planetary row 4, and the five clutches are the first clutch 5, the Second clutch 6, third clutch 7, fourth clutch 8 and fifth clutch 9;

The first clutch 5 is connected between the planetary carrier 1-3 of the first planetary row 1 and the ring gear 1-4;

The planetary carrier 1-3 of the first planetary row is connected with the brake 10, and the planetary carrier 1-3 of the first planetary row is connected with the ring gear 2-4 of the second planetary row through the second clutch 6 and the third clutch 7 in turn, The ring gear 1-4 of the first planet row is directly connected to the planet carrier 2-3 of the second planet row, and the sun gear 1-1 of the first planet row is connected to the planet carrier 4-3 of the fourth planet row through the fifth clutch 9 connected so that the fourth planetary row 4 can participate in power transmission when the fifth clutch 9 is closed.

The sun gear 2-1 of the second planetary row is connected to the ring gear 3-4 of the third planetary row and fixed as a whole;

The sun gear 3-1 of the third planetary row is connected to the sun gear 4-1 of the fourth planetary row and then integrally connected between the second clutch 6 and the third clutch 7;

The power input member 12 is connected with the sun gear 1-1 of the first planetary row, the planet carrier 3-3 of the third planetary row is connected with the power output member 13 through the fourth clutch 8, and the power output member 13 is also connected with the fourth planetary row The ring gear is connected 4-4.

Based on the combination of the above-mentioned planetary row, multiple clutches and brakes, the automatic transmission can realize 9 forward gears and 1 reverse gear. It reduces the manufacturing difficulty of the case, which is beneficial to the lightweight of the entire transmission; and the use of more clutches (5) is conducive to the nesting design of the clutches, making the whole mechanism more compact, and more clutches (5) have It is beneficial to cut off the connection relationship between the planetary rows in a specific gear, so that the redundant planetary row does not participate in the rotation, reduces the drag torque, reduces the oil churning loss with the row, and improves efficiency; row or add more operating parts to expand more speed gears.

The implementation form of each gear in this embodiment is consistent with that in Embodiment 1.

As a preferred solution, the sun gear 3-1 of the third planetary row is fixedly connected to the sun gear 4-1 of the fourth planetary row through splines or welding, and the sun gear 2-1 of the second planetary row is connected to the third planetary row The ring gears 3-4 are fixedly connected by splines or welding.

One end of the brake 10 is connected to the case 11 of the gearbox, and the other end is connected to the planet carrier 1-3 of the first planetary row; the sun gear 2-1 of the second planetary row is connected to the ring gear 3-4 of the third planetary row The rear whole is fixedly connected with the box body 11 of the gearbox, and is directly fixedly connected to the box body 11 through the whole body, so that there is no need to set a brake at the connection, so as to avoid impact on the box body 11 during the shifting process, thereby improving the box body. 11, preferably, the sun gear 2-1 of the second planetary row is connected with the ring gear 3-4 of the third planetary row, and then the whole is fixed with the case 11 of the gearbox by spline or welding connect.

Example 8

As shown in Figure 8, the automatic transmission of the eighth preferred embodiment of the present invention includes a power input member 12, a power output member 13, four planetary rows, five clutches and a brake 10, each planetary row includes a sun gear, Planetary gear, planet carrier and ring gear, the four planetary rows are the first planetary row 1, the second planetary row 2, the third planetary row 3 and the fourth planetary row 4, and the five clutches are the first clutch 5, the Second clutch 6, third clutch 7, fourth clutch 8 and fifth clutch 9;

The first clutch 5 is connected between the planetary carrier 1-3 of the first planetary row 1 and the sun gear 1-1;

The planetary carrier 1-3 of the first planetary row is connected with the brake 10, and the planetary carrier 1-3 of the first planetary row is connected with the ring gear 2-4 of the second planetary row through the second clutch 6 and the third clutch 7 in turn, The ring gear 1-4 of the first planet row is directly connected to the planet carrier 2-3 of the second planet row, and the sun gear 1-1 of the first planet row is connected to the planet carrier 4-3 of the fourth planet row through the fifth clutch 9 connected so that the fourth planetary row 4 can participate in power transmission when the fifth clutch 9 is closed.

The sun gear 2-1 of the second planetary row is connected to the ring gear 3-4 of the third planetary row and fixed as a whole;

The sun gear 3-1 of the third planetary row is connected to the sun gear 4-1 of the fourth planetary row and then integrally connected between the second clutch 6 and the third clutch 7;

The power input member 12 is connected with the sun gear 1-1 of the first planetary row, the planet carrier 3-3 of the third planetary row is connected with the power output member 13 through the fourth clutch 8, and the power output member 13 is also connected with the fourth planetary row The ring gear is connected 4-4.

Based on the combination of the above-mentioned planetary row, multiple clutches and brakes, the automatic transmission can realize 9 forward gears and 1 reverse gear. It reduces the manufacturing difficulty of the case, which is beneficial to the lightweight of the entire transmission; and the use of more clutches (5) is conducive to the nesting design of the clutches, making the whole mechanism more compact, and more clutches (5) have It is beneficial to cut off the connection relationship between the planetary rows in a specific gear, so that the redundant planetary row does not participate in the rotation, reduces the drag torque, reduces the oil churning loss with the row, and improves efficiency; row or add more operating parts to expand more speed gears.

The implementation form of each gear in this embodiment is consistent with that in Embodiment 1.

As a preferred solution, the sun gear 3-1 of the third planetary row is fixedly connected to the sun gear 4-1 of the fourth planetary row through splines or welding, and the sun gear 2-1 of the second planetary row is connected to the third planetary row The ring gears 3-4 are fixedly connected by splines or welding.

One end of the brake 10 is connected to the case 11 of the gearbox, and the other end is connected to the planet carrier 1-3 of the first planetary row; the sun gear 2-1 of the second planetary row is connected to the ring gear 3-4 of the third planetary row The rear whole is fixedly connected with the box body 11 of the gearbox, and is directly fixedly connected to the box body 11 through the whole body, so that there is no need to set a brake at the connection, so as to avoid the impact on the box body 11 during the shifting process, thereby improving the box body. The loading condition of the body 11, preferably, the sun gear 2-1 of the second planetary row is connected with the ring gear 3-4 of the third planetary row, and the whole is splined or welded to the case body 11 of the gearbox Fixed connection.

To sum up, the automatic transmission provided by the present invention can realize 9 forward gears and 1 reverse gear by using 4 planetary rows and 6 shift operating elements (which include 5 clutches and 1 brake). For a transmission with the same number of shift operating elements (6), the reduction in the number of brakes reduces the difficulty of manufacturing the case, which is conducive to the lightweight of the entire transmission; and the use of more clutches (5) is conducive to the nesting of clutches The design makes the whole mechanism more compact, and more clutches (5) are beneficial to cut off the connection relationship between the planetary rows in a specific gear, so that the redundant planetary rows do not participate in the rotation, reduce the drag torque, and reduce the belt row Oil churning loss improves efficiency; in addition, more clutches are conducive to the expansion of more speed gears by adding planetary rows or adding more operating parts in the future.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and replacements can also be made, these improvements and replacements It should also be regarded as the protection scope of the present invention.

Claims (8)

1. An automatic transmission, characterized in that it includes a power input member, a power output member, 4 planetary rows, 5 clutches and 1 brake, and each of the planetary rows includes a sun gear, a planetary gear, a planet carrier and a gear circle, the four planetary rows are the first planetary row, the second planetary row, the third planetary row and the fourth planetary row, and the five clutches are the first clutch, the second clutch, the third clutch, the Quad clutch and fifth clutch; The first clutch is connected between any two of the sun gear, the planet carrier and the ring gear of the first planetary row; The planetary carrier of the first planetary row is connected with the brake, and the planetary carrier of the first planetary row is connected with the ring gear of the second planetary row through the second clutch, and the planetary carrier of the first planetary row The ring gear is connected to the planet carrier of the second planet row, and the sun gear of the first planet row is connected to the planet carrier of the fourth planet row; The sun gear of the second planetary row is fixed as a whole after being connected with the ring gear of the third planetary row; The sun gear of the third planetary row is integrally connected between the second clutch and the ring gear of the second planetary row after being connected with the sun gear of the fourth planetary row; The power input member is connected to the sun gear of the first planetary row, the planet carrier of the third planetary row is connected to the power output member of the transmission through the fourth clutch, and the power output member of the transmission Also connected with the ring gear of the fourth planetary row; The fifth clutch is connected with the fourth planetary row, and is used to enable the fourth planetary row to participate in power transmission when closed; The third clutch is connected between the ring gear of the first planetary row and the carrier of the second planetary row, or the third clutch is connected between the second clutch and the second planetary row between ring gears; When the third clutch is connected between the second clutch and the ring gear of the second planetary row, the sun gear of the third planetary row is integrally connected with the sun gear of the fourth planetary row between the second clutch and the third clutch. 2. The automatic transmission according to claim 1, wherein the sun gear of the first planetary row is directly connected to the planetary carrier of the fourth planetary row, and the power output member of the transmission passes through the fifth The clutch is connected with the ring gear of the fourth planetary row. 3. The automatic transmission according to claim 1, wherein the sun gear of the first planetary row is connected to the planetary carrier of the fourth planetary row through the fifth clutch, and the power output member of the transmission It is directly connected with the ring gear of the fourth planetary row. 4. The automatic transmission according to any one of claims 1 to 3, characterized in that, the sun gear of the third planetary row is fixedly connected with the sun gear of the fourth planetary row through splines or welding . 5. The automatic transmission according to any one of claims 1 to 3, characterized in that, the sun gear of the second planetary row is fixedly connected to the ring gear of the third planetary row by means of splines or welding . 6. The automatic transmission according to any one of claims 1 to 3, wherein one end of the brake is connected to the case of the transmission, and the other end of the brake is connected to the first planetary row. Planet carrier connection. 7. The automatic transmission according to any one of claims 1 to 3, characterized in that, after the sun gear of the second planetary row is connected with the ring gear of the third planetary row, it is integrally connected with the case of the transmission Body fixed connection. 8. The automatic transmission according to claim 7, characterized in that, after the sun gear of the second planetary row is connected with the ring gear of the third planetary row, the whole body is splined or welded to the case of the transmission fixed connection.

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