A 9-speed AT automatic transmission

Abstract

The present invention discloses a 9-speed AT automatic transmission, comprising an input shaft, a first planetary gear mechanism connected to the input shaft, a second planetary gear mechanism, a first clutch connected to the first planetary gear mechanism and the second planetary gear mechanism, a second clutch and a fourth clutch connected to the second planetary gear mechanism and the input shaft, a third clutch connected to the first planetary gear mechanism and the second planetary gear mechanism, and a first brake and a second brake connected to the second planetary gear mechanism, wherein the second planetary gear mechanism is a Ravina-type planetary gear mechanism. The 9-speed AT automatic transmission of the present invention has a compact structure, a short power transmission route, multiple gears, a small space, an obvious cost advantage, and reduces the space occupied by the transmission.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile gearboxes, and in particular, the invention relates to a 9-speed AT automatic gearbox. Background Art

[0002] The times are developing and technology is advancing. In the field of automatic transmissions, the number of gears, high transmission efficiency and compact structure are required, so that the car has the advantages of low fuel consumption and good driving performance. The existing 9-speed AT automatic transmission has the disadvantages of complex structure and long power transmission route, resulting in large size, occupying more space, high cost and low power transmission efficiency. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a 9-speed AT automatic transmission, the purpose of which is to save space.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a 9-speed AT automatic transmission, including an input shaft, a first planetary gear mechanism connected to the input shaft, a second planetary gear mechanism, a first clutch connected to the first planetary gear mechanism and the second planetary gear mechanism, a second clutch and a fourth clutch connected to the second planetary gear mechanism and the input shaft, a third clutch connected to the first planetary gear mechanism and the second planetary gear mechanism, and a first brake and a second brake connected to the second planetary gear mechanism, and the second planetary gear mechanism is a Ravina type planetary gear mechanism.

[0005] The first planetary gear mechanism includes a first sun gear, a first planet carrier, a first planetary gear disposed on the first planet carrier, and a first inner ring gear meshed with the first planetary gear and connected to the input shaft.

[0006] The first sun gear is fixedly arranged, and the first clutch and the third clutch are connected to the first planet carrier.

[0007] The second planetary gear mechanism includes a second sun gear, a third sun gear, a second planet carrier, a third planetary gear meshing with the third sun gear, a second planetary gear meshing with the second sun gear and the third planetary gear, and a second inner ring gear and a third inner ring gear meshing with the second planetary gear. The second planetary gear and the third planetary gear are arranged on the second planet carrier.

[0008] The first clutch is connected to the third sun gear, the second clutch is connected to the second planet carrier, the third clutch is connected to the second sun gear, the fourth clutch is connected to the third inner ring gear, the first brake is connected to the second sun gear and the transmission housing, and the second brake is connected to the second planet carrier and the transmission housing.

[0009] The first brake and the third clutch are connected.

[0010] The 9-speed AT automatic transmission of the present invention has the following beneficial effects:

[0011] (1) To achieve 9 gears, only a simple planetary gear mechanism and a Ravina-type planetary gear mechanism are needed. The number of transmission elements is relatively small, the arrangement is compact, the space is small, the cost advantage is obvious, and the space occupied by the transmission is reduced;

[0012] (2) Each gear position only requires two actuators, the shifting logic is clear, and the transmission route is relatively short.

[0013] (3) It has 9 forward gears, which is an advantage in terms of the number of gears;

[0014] (4) Compared with the traditional 8-speed gearbox, no additional actuators are required, the space does not need to be increased, and the cost increase is limited. Therefore, compared with the existing 9-speed gearbox, the cost advantage is obvious;

[0015] (5) Compared with the traditional 6-speed transmission, only one actuator needs to be added to increase the number of forward gears, which has obvious technical advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] This specification includes the following drawings, which show the following contents:

[0017] Figure 1 It is a structural schematic diagram of a 9-speed AT automatic transmission of the present invention;

[0018] Figure 2 It is a schematic diagram of the working state of each component of the 9-speed AT automatic transmission of the present invention at each gear position;

[0019] Figure 3 This is the power transmission route in third gear;

[0020] Figure 4 This is the power transmission route in fourth gear;

[0021] Figure 5 This is the power delivery roadmap in fifth gear;

[0022] Figure 6 This is the power delivery route in sixth gear;

[0023] Figure 7 This is the power delivery roadmap in seventh gear;

[0024] Marked in the figure: C1, first clutch; C2, second clutch; C3, third clutch; C4, fourth clutch; B1, first brake; B2, second brake; R1, first inner ring gear; PC1, first planetary carrier; S1, first sun gear; P1, first planetary gear; P2, second planetary gear; PC2, second planetary carrier; S2; second sun gear; S3, third sun gear; P3, third planetary gear; R2, second inner ring gear; R3, third inner ring gear. DETAILED DESCRIPTION

[0025] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of the present invention and facilitating its implementation.

[0026] It should be noted that, in the following embodiments, the "first", "second", "third" and "fourth" do not represent an absolute distinction in structure and / or function, nor do they represent a sequence of execution, but are merely for the convenience of description.

[0027] like Figure 1 As shown, the present invention provides a 9-speed AT automatic transmission, including a transmission housing, an input shaft, a first planetary gear mechanism connected to the input shaft, a second planetary gear mechanism, a first clutch C1 connected to the first planetary gear mechanism and the second planetary gear mechanism, a second clutch C2 and a fourth clutch C4 connected to the second planetary gear mechanism and the input shaft, a third clutch C3 connected to the first planetary gear mechanism and the second planetary gear mechanism, and a first brake B1 and a second brake B2 connected to the second planetary gear mechanism, and the second planetary gear mechanism is a Ravina type planetary gear mechanism.

[0028] Specifically, if Figure 1 As shown, the first planetary gear mechanism includes a first sun gear S1, a first planet carrier PC1, a first planetary gear P1 disposed on the first planet carrier PC1, and a first inner ring gear R1 meshing with the first planetary gear P1 and connected to the input shaft, and the first planetary gear P1 is rotatably disposed on the first planet carrier PC1. The first sun gear S1 is fixedly disposed, and the first sun gear S1 is always in a fixed state. The first clutch C1 and the third clutch C3 are connected to the first planet carrier PC1. The first inner ring gear R1 is fixedly connected to the input shaft, and the first inner ring gear R1 and the input shaft are coaxially disposed.

[0029] like Figure 1As shown, the second planetary gear mechanism includes a second sun gear S2, a third sun gear S3, a second planet carrier PC2, a third planetary gear P3 meshed with the third sun gear S3, a second planetary gear P2 meshed with the second sun gear S2 and the third planetary gear P3, and a second inner ring gear R2 and a third inner ring gear R3 meshed with the second planetary gear P2, and the second planetary gear P2 and the third planetary gear P3 are arranged on the second planet carrier PC2. The second planetary gear P2 and the third planetary gear P3 are rotatably arranged on the second planet carrier PC2, the second inner ring gear R2 and the second sun gear S2 are meshed with one end of the second planetary gear P2, the third planetary gear P3 and the third inner ring gear R3 are meshed with the other end of the second planetary gear P2, the second planetary gear P2 is located between the third inner ring gear R3 and the third planetary gear P3, and the third planetary gear P3 is meshed with the third sun gear S3. A plurality of second planetary gears P2 are provided and all the second planetary gears P2 are evenly distributed around the second sun gear S2. A plurality of third planetary gears P3 are also provided and all the third planetary gears P3 are evenly distributed around the third sun gear S3. The second planetary gear P2 is located between the second inner gear ring R2 and the second sun gear S2 and the second planetary gear P2 is meshed with the second inner gear ring R2 and the second sun gear S2. The third planetary gear P3 is located between the second planetary gear P2 and the third sun gear S3 and the third planetary gear P3 is meshed with the second planetary gear P2 and the third sun gear S3. The second inner gear ring R2 and the second sun gear S2 are meshed with one end of the second planetary gear P2, and the third planetary gear P3 is meshed with the other end of the second planetary gear P2. The input shaft is the power input component of the gearbox, and the second inner gear ring R2 is the power output component of the gearbox.

[0030] like Figure 1As shown, the first clutch C1 is connected to the first planet carrier PC1 and the third sun gear S3, and the first clutch C1 is used to control the engagement and separation between the first planet carrier PC1 and the third sun gear S3. The second clutch C2 is connected to the input shaft and the second planet carrier PC2, the input shaft rotates synchronously with the first inner gear R1, and the second clutch C2 is used to control the engagement and separation between the input shaft and the second planet carrier PC2. The third clutch C3 is connected to the first planet carrier PC1 and the second sun gear S2, and the third clutch C3 is used to control the engagement and separation between the first planet carrier PC1 and the second sun gear S2. The fourth clutch C4 is connected to the input shaft and the third inner gear R3, the input shaft rotates synchronously with the first inner gear R1, and the fourth clutch C4 is used to control the engagement and separation between the input shaft and the third inner gear R3. The first brake B1 is connected to the second sun gear S2 and the transmission housing, and the first brake B1 is used to brake the second sun gear S2. The second brake B2 is connected to the second planet carrier PC2 and the transmission housing, and the second brake B2 is used to brake the second planet carrier PC2. The first brake B1 is also connected to the third clutch C3 . The first brake B1 can connect the fixed transmission housing and the first planet carrier PC1 through the third clutch C3 . That is, the first brake B1 can be used to brake the first planet carrier PC1 .

[0031] like Figure 1 and Figure 2 As shown, when the gearbox is in the first gear, the first clutch C1 and the second brake B2 are working, the first clutch C1 is in the engaged state, the second brake B2 is in the braking state, the first clutch C1 connects the third sun gear S3 with the first planet carrier PC1, the third sun gear S3 and the first planet carrier PC1 can rotate synchronously, and at the same time the second brake B2 keeps the second planet carrier PC2 stationary, and the second planet carrier PC2 cannot rotate.

[0032] The power transmission route when the gearbox is in the first gear is: input shaft → first inner ring gear R1 (first sun gear S1 is fixed) → first planet carrier PC1 → third sun gear S3 (second planet carrier PC2 is fixed) → second inner ring gear R2 → output.

[0033] When the gearbox is in the first gear, after the input shaft rotates, the power of the input shaft is transmitted to the second inner ring gear R2 through the first inner ring gear R1, the first planetary gear P1, the first planetary carrier PC1, the third sun gear S3, the third planetary gear P3 and the second planetary gear P2 in sequence, and finally the power is output by the second inner ring gear R2.

[0034] like Figure 1 and Figure 2As shown, when the gearbox is in the second gear, the first clutch C1 and the first brake B1 are working, the first clutch C1 is in the engaged state, the first brake B1 is in the braking state, the first clutch C1 connects the third sun gear S3 with the first planet carrier PC1, the third sun gear S3 and the first planet carrier PC1 can rotate synchronously, and at the same time the first brake B1 keeps the second sun gear S2 stationary, and the second sun gear S2 cannot rotate.

[0035] The power transmission route when the gearbox is in the second gear is: input shaft → first internal ring gear R1 (first sun gear S1 is fixed) → first planet carrier PC1 → third sun gear S3 (second planet carrier PC2 is fixed) → second internal ring gear R2 → output.

[0036] When the gearbox is in the second gear, after the input shaft rotates, the power of the input shaft is transmitted to the second inner ring gear R2 through the first inner ring gear R1, the first planetary gear P1, the first planetary carrier PC1, the third sun gear S3, the third planetary gear P3, the second planetary carrier PC2 and the second planetary gear P2 in sequence, and finally the power is output by the second inner ring gear R2.

[0037] like Figure 1 and Figure 2 As shown, when the gearbox is in the third gear, the first clutch C1 and the third clutch C3 are working, the first clutch C1 and the third clutch C3 are in the engaged state, the first clutch C1 connects the first planet carrier PC1 and the third sun gear S3, the first planet carrier PC1 and the third sun gear S3 can rotate synchronously, and at the same time the third clutch C3 connects the first planet carrier PC1 and the second sun gear S2, the first planet carrier PC1 and the second sun gear S2 can rotate synchronously, the power is in accordance with Figure 3 route delivery.

[0038] When the gearbox is in the third gear, after the input shaft rotates, the power of the input shaft is transmitted to the first planetary carrier PC1 through the first inner ring gear R1 and the first planetary gear P1 in sequence, and then the power is divided into two paths for transmission. One path is transmitted to the second inner ring gear R2 through the second sun gear S2 and the second planetary gear P2 in sequence, and the other path is transmitted to the second inner ring gear R2 through the third sun gear S3, the third planetary gear P3, the second planetary carrier PC2 and the second planetary gear P2 in sequence. Finally, the power is output by the second inner ring gear R2.

[0039] like Figure 1 and Figure 2As shown, when the gearbox is in the fourth gear, the first clutch C1 and the second clutch C2 are working, the first clutch C1 and the second clutch C2 are in the engaged state, the first clutch C1 connects the first planet carrier PC1 and the third sun gear S3, the first planet carrier PC1 and the third sun gear S3 can rotate synchronously, and the second clutch C2 connects the second planet carrier PC2 to the input shaft, the second planet carrier PC2 and the input shaft can rotate synchronously, the power is in accordance with Figure 4 route delivery.

[0040] When the gearbox is in the fourth gear, after the input shaft rotates, the power of the input shaft is divided into two paths. One path is transmitted to the second inner ring gear R2 via the second planetary carrier PC2 and the second planetary gear P2 in sequence, and the other path is transmitted to the second inner ring gear R2 via the first planetary carrier PC1, the third sun gear S3, the third planetary gear P3, the second planetary carrier PC2 and the second planetary gear P2 in sequence. Finally, the power is output by the second inner ring gear R2.

[0041] like Figure 1 and Figure 2 As shown, when the gearbox is in the fifth gear, the first clutch C1 and the fourth clutch C4 are working, the first clutch C1 and the fourth clutch C4 are in the engaged state, the first clutch C1 connects the first planet carrier PC1 and the third sun gear S3, the first planet carrier PC1 and the third sun gear S3 can rotate synchronously, and the fourth clutch C4 connects the third inner gear R3 and the input shaft, the third inner gear R3 and the input shaft can rotate synchronously, the power is in accordance with Figure 5 route delivery.

[0042] When the gearbox is in the fifth gear, after the input shaft rotates, the power of the input shaft is divided into two paths. One path is transmitted to the second inner ring gear R2 via the third inner ring gear R3 and the second planetary gear P2 in sequence, and the other path is transmitted to the second inner ring gear R2 via the first planet carrier PC1, the third sun gear S3, the third planetary gear P3, the second planet carrier PC2 and the second planetary gear P2 in sequence. Finally, the power is output by the second inner ring gear R2.

[0043] like Figure 1 and Figure 2 As shown, when the gearbox is in the sixth gear, the second clutch C2 and the fourth clutch C4 are working, the second clutch C2 and the fourth clutch C4 are in the engaged state, the second clutch C2 connects the second planetary carrier PC2 with the input shaft, the second planetary carrier PC2 and the input shaft can rotate synchronously, and the fourth clutch C4 connects the third inner gear ring R3 with the input shaft, the third inner gear ring R3 and the input shaft can rotate synchronously, the power is in accordance with Figure 5 route delivery.

[0044] When the gearbox is in the sixth gear, after the input shaft rotates, the power of the input shaft is divided into two paths. One path is transmitted to the second inner ring gear R2 via the third inner ring gear R3 and the second planetary gear P2 in sequence, and the other path is transmitted to the second inner ring gear R2 via the second planetary carrier PC2 and the second planetary gear P2 in sequence. Finally, the power is output by the second inner ring gear R2.

[0045] like Figure 1 and Figure 2 As shown, when the gearbox is in the seventh gear, the third clutch C3 and the fourth clutch C4 are working, the third clutch C3 and the fourth clutch C4 are in the engaged state, the third clutch C3 connects the first planet carrier PC1 with the second sun gear S2, the first planet carrier PC1 and the second sun gear S2 can rotate synchronously, and the fourth clutch C4 connects the third inner gear R3 with the input shaft, the third inner gear R3 and the input shaft can rotate synchronously, and the power is in accordance with Figure 5 route delivery.

[0046] When the gearbox is in the seventh gear, after the input shaft rotates, the power of the input shaft is divided into two paths. One path is transmitted to the second inner ring gear R2 via the third inner ring gear R3 and the second planetary gear P2 in sequence, and the other path is transmitted to the second inner ring gear R2 via the first inner ring gear R1, the first planetary gear P1, the first planetary carrier PC1, the second sun gear S2 and the second planetary gear P2 in sequence. Finally, the power is output by the second inner ring gear R2.

[0047] like Figure 1 and Figure 2 As shown, when the gearbox is in the eighth gear, the fourth clutch C4 and the first brake B1 are working, the fourth clutch C4 is in the engaged state, the first brake B1 is in the braking state, the fourth clutch C4 connects the third internal gear R3 with the input shaft, the third internal gear R3 and the input shaft can rotate synchronously, and at the same time the first brake B1 keeps the second sun gear S2 stationary, and the second sun gear S2 cannot rotate.

[0048] When the gearbox is in the eighth gear, the power transmission route is: input shaft → third internal gear ring R3 (second sun gear S2 is fixed) → second internal gear ring R2 → output.

[0049] When the gearbox is in the eighth gear, after the input shaft rotates, the power of the input shaft is transmitted to the second inner ring gear R2 through the third inner ring gear R3 and the second planetary gear P2 in sequence, and finally the power is output by the second inner ring gear R2.

[0050] like Figure 1 and Figure 2As shown, when the gearbox is in the ninth gear, the fourth clutch C4 and the second brake B2 are working, the fourth clutch C4 is in an engaged state, the second brake B2 is in a braking state, the fourth clutch C4 connects the third inner gear ring R3 with the input shaft, the third inner gear ring R3 and the input shaft can rotate synchronously, and at the same time the second brake B2 keeps the second planet carrier PC2 stationary, and the second planet carrier PC2 cannot rotate.

[0051] The power transmission route when the gearbox is in the ninth gear is: input shaft → third internal gear ring R3 (fixed by the second planetary carrier PC2) → second internal gear ring R2 → output.

[0052] When the gearbox is in the ninth gear, after the input shaft rotates, the power of the input shaft is transmitted to the second internal gear ring R2 through the third internal gear ring R3 and the second planetary gear P2 in sequence, and finally the power is output by the second internal gear ring R2.

[0053] like Figure 1 and Figure 2 As shown, when the gearbox is in reverse gear, the third clutch C3 and the second brake B2 are working, the third clutch C3 is in an engaged state, the second brake B2 is in a braking state, the third clutch C3 connects the first planet carrier PC1 with the second sun gear S2, the first planet carrier PC1 and the second sun gear S2 can rotate synchronously, and at the same time the second brake B2 keeps the second planet carrier PC2 stationary, and the second planet carrier PC2 cannot rotate.

[0054] The power transmission route when the gearbox is in reverse gear is: input shaft → first internal ring gear R1 (first sun gear S1 is fixed) → first planet carrier PC1 → second sun gear S2 (second planet carrier PC2 is fixed) → second internal ring gear R2 → output.

[0055] When the gearbox is in reverse gear, after the input shaft rotates, the power of the input shaft is transmitted to the second inner ring gear R2 through the first inner ring gear R1, the first planetary gear P1, the first planetary carrier PC1, the second sun gear S2 and the second planetary gear P2 in sequence, and finally the power is output by the second inner ring gear R2.

[0056] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A 9-speed AT automatic transmission, comprising an input shaft, characterized in that: It also includes a first planetary gear mechanism connected to the input shaft, a second planetary gear mechanism, a first clutch connected to the first planetary gear mechanism and the second planetary gear mechanism, a second clutch and a fourth clutch connected to the second planetary gear mechanism and the input shaft, a third clutch connected to the first planetary gear mechanism and the second planetary gear mechanism, and a first brake and a second brake connected to the second planetary gear mechanism, wherein the second planetary gear mechanism is a Ravina-type planetary gear mechanism; The first planetary gear mechanism comprises a first sun gear, a first planet carrier, a first planetary gear disposed on the first planet carrier, and a first inner gear ring meshed with the first planetary gear and connected to the input shaft; The second planetary gear mechanism comprises a second sun gear, a third sun gear, a second planet carrier, a third planet gear meshed with the third sun gear, a second planet gear meshed with the second sun gear and the third planet gear, and a second inner gear ring and a third inner gear ring meshed with the second planet gear, and the second planet gear and the third planet gear are arranged on the second planet carrier; The first clutch is connected to the first planet carrier and the third sun gear, and the first clutch is used to control the engagement and separation between the first planet carrier and the third sun gear; The second clutch is connected to the second planetary carrier, the third clutch is connected to the second sun gear, the fourth clutch is connected to the third internal gear ring, the first brake is connected to the second sun gear and the transmission housing, and the second brake is connected to the second planetary carrier and the transmission housing.

2. The 9-speed AT automatic transmission according to claim 1, characterized in that: The first sun gear is fixedly arranged, and the third clutch is connected to the first planet carrier.

3. The 9-speed AT automatic transmission according to claim 1, characterized in that: The first brake and the third clutch are connected.

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