Nine-gear dual-clutch transmission

Abstract

A nine-gear double-clutch transmission is structurally formed by connecting a double-clutch transmission with three forward gears and a reverse gear with a three-gear planetary gear transmission composed of two planetary rows in series. The working principle is as follows: the double-clutch transmission with three forward gears and one reverse gear realizes three forward gears and one reverse gear through the control of the double clutches, the one-way clutch and the synchronizer; an output shaft of the nine-gear double-clutch transmission is connected with a three-gear planetary gear transmission composed of two planet rows, a clutch and two brakes, the gear number of the three-gear planetary gear transmission is the product of the gear number of the planet rows and the gear number of the three-gear planetary gear transmission, nine forward gears and three reverse gears are arranged in total, and the nine-gear double-clutch transmission is formed.

Description

Technical Field

[0001] The invention belongs to the field of transmissions, and in particular relates to a nine-speed dual-clutch transmission. Background Art

[0002] The dual-clutch automatic transmission integrates two gearboxes and two clutches in one transmission. Two input shafts that are rotatably sleeved together are connected to one of the clutches respectively. The two input shafts transmit the power of the two gearbox speed groups respectively. The shifting procedure is completed by automatically switching between the two clutches. Therefore, the power shifting process can be realized, that is, the power is not interrupted during the shifting process, which overcomes the disadvantage of the AMT shifting shock. During the shifting process, the engine power can always be transmitted to the wheels. The shifting is fast and smooth, which not only ensures the acceleration of the vehicle, but also greatly improves the comfort of the vehicle operation because the vehicle no longer produces a sharp deceleration caused by the shifting. However, each gear of the dual-clutch transmission corresponds to a pair of meshing gears, and the gear is selected by the synchronizer and the shift fork. For each additional gear, an additional pair of gears needs to be added, and the arrangement of the shift fork and the synchronizer must also be considered, resulting in an increase in the axial size of the dual-clutch transmission. As a result, there are fewer gears for the speed change, making it difficult for the engine to work in the optimal working area, which has an adverse effect on the power and economy of the vehicle. At the same time, in situations where frequent acceleration and deceleration are required, the synchronizer and shift fork select gears frequently, which affects the shifting speed and the service life of the synchronizer and shift fork. Summary of the invention

[0003] The technical problem to be solved by the present invention is: in view of the problems that the existing dual-clutch transmission is long, has few gears, and frequent acceleration and deceleration shifting affects the shifting speed and the service life of the synchronizer and the shift fork, a nine-speed dual-clutch transmission is provided to solve the above technical problems.

[0004] The technical solution of the present invention is: a nine-speed dual-clutch transmission is composed of a dual-clutch transmission with three forward gears and one reverse gear and a three-speed planetary gear transmission composed of two planetary rows connected in series, and its gear number is the product of the gear numbers of the two, with a total of nine forward gears and three reverse gears.

[0005] The structure of the nine-speed dual-clutch transmission is composed of a housing, a dual clutch, a fixed-shaft gear train and a planetary gear train, wherein the dual clutch is composed of a first clutch and a second clutch, wherein the first clutch is mounted on the first input shaft, and the second clutch is mounted on the second input shaft. The fixed-shaft gear train is composed of a first input shaft, a second input shaft, a reverse gear shaft, a forward gear shaft and gears, a synchronizer and a one-way clutch mounted thereon; the first input shaft is supported on the transmission housing and connected to the first clutch through the second input shaft, and an intermediate driven gear is mounted on the first input shaft through a spline; the second input shaft is cylindrical and is mounted on the first input shaft through a bearing sleeve, and a low-speed driving gear and a high-speed driving gear are mounted on the second input shaft through a spline, and the second input shaft is supported on the transmission housing; a reverse synchronizer, a reverse gear and a reverse intermediate driving gear are mounted on the reverse gear shaft, and the reverse gear is loosely mounted thereon and can rotate relative to the reverse gear shaft, and the reverse intermediate gear is mounted on the reverse gear shaft through a spline, and the reverse intermediate driving gear cooperates with the intermediate driven gear to reverse The power of the forward gear shaft is transmitted to the first input shaft, and both ends of the reverse gear shaft are supported on the transmission case; the forward gear shaft is installed with a forward high-speed gear synchronizer, a high-speed gear driven gear, a one-way clutch, a low-speed gear driven gear and a forward gear intermediate driving gear, the high-speed gear driven gear is loosely sleeved on the forward gear shaft, and the low-speed gear driven gear is installed on the forward gear shaft through a one-way clutch and can rotate relative to it; the forward high-speed gear synchronizer is used to control whether the high-speed gear driven gear rotates together with the forward gear shaft, the one-way clutch is used to control whether the low-speed gear driven gear rotates together with the forward gear shaft, and the forward gear intermediate driving gear is installed on the forward gear shaft through a spline, and the forward gear intermediate driving gear and the intermediate driven gear cooperate to transmit the power of the forward gear shaft to the first input shaft. The planetary gear train consists of an input shaft, a front planetary row, a rear planetary row, a front planetary row clutch, a front planetary row gear ring brake, a rear planetary row gear ring brake and an output gear; wherein the input shaft is the first input shaft, and the front planetary row and the rear planetary row each include a group of gear rings, planetary gears, a sun gear and a planet carrier; the rear planetary row planet carrier is loosely sleeved on the input shaft and can rotate relative to the input shaft; the front planetary row gear ring is sleeved on the input shaft through a cylindrical front planetary row gear ring shaft, and the front planetary row gear ring shaft is provided with an external spline, and the front planetary row clutch consists of a front planetary row clutch active plate and a front planetary row clutch driven plate, and the front planetary row clutch active plate is fixed on the first input shaft, and the center hole of the front planetary row clutch driven plate is provided with an internal spline, and the front planetary row clutch driven plate is mounted on the front planetary row gear ring shaft through a spline; the front planetary row gear ring is equipped with a front planetary row gear ring brake for braking the front planetary row gear ring. The ring gear of the rear planetary gear set is integrated with the planet carrier of the front planetary gear set. The rear planetary gear set is equipped with a rear planetary gear set brake for braking the rear planetary gear set. The front planetary gear set sun gear and the rear planetary gear set sun gear are both installed on the input shaft through splines. The output gear is fixed on the rear planet carrier to output power to the outside.

[0006] The beneficial effects of the present invention are as follows: the nine-speed dual-clutch transmission has many gears, a short overall length, a small volume, a light weight, a high comprehensive efficiency, a fast speed for frequent acceleration and deceleration shifting, a small number of synchronizer operations and a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 The present invention is a schematic diagram of the structure of the present invention. In the figure, (1) reverse gear, (2) reverse gear synchronizer, (3) reverse gear shaft, (4) second clutch, (5) high-speed driving gear, (6) first clutch, (7) low-speed driving gear, (8) second input shaft, (9) intermediate driven gear, (10) reverse gear intermediate gear, (11) forward gear shaft, (12) forward high-speed synchronizer, (13) high-speed driven gear, (14) one-way clutch, (15) low-speed driven gear, (16) forward gear intermediate driving gear, (17) front planetary gear clutch main gear, (18) front planetary gear clutch main gear, (19) front planetary gear clutch main gear, (20) front planetary gear synchronizer, (21) front planetary gear synchronizer, (22) front planetary gear synchronizer, (23) front planetary gear synchronizer, (24) front planetary gear synchronizer, (25) front planetary gear synchronizer, (26) front planetary gear synchronizer, (27) front planetary gear synchronizer, (28) front planetary gear synchronizer, (29) front planetary gear synchronizer, (30) front planetary gear synchronizer, (31) front planetary gear synchronizer, (32) front planetary gear synchronizer, (33) front planetary gear synchronizer, (34) front planetary gear synchronizer, (35) front planetary gear synchronizer, (36) front planetary gear synchronizer, (37) front planetary gear synchronizer, (38) front planetary gear synchronizer, (39) front planetary gear synchronizer, (40) front planetary gear synchronizer, (41) front planetary gear synchronizer, (42) front planetary gear synchronizer, (43) front planetary gear synchronizer, (44) front planetary gear synchronizer, (45) front planetary gear synchronizer, (46) front planetary gear synchronizer, (47) front planetary gear synchronizer, (48) front planetary gear synchronizer, (49) front driven plate, (18) front planetary gear ring brake, (19) front planetary gear, (20) rear planetary gear ring, (21) transmission case, (22) rear planetary gear, (23) rear planetary carrier, (24) output gear, (25) first input shaft, (26) rear planetary sun gear, (27) rear planetary gear ring brake, (28) front planetary carrier, (29) front planetary sun gear, (30) front planetary gear ring, (31) front planetary clutch driven plate, (32) front planetary gear ring shaft. DETAILED DESCRIPTION

[0008] Combine the following Figure 1 The preferred embodiments of the present invention are described in detail.

[0009] See also Figure 1The double clutch of the nine-speed double clutch transmission is composed of a first clutch (6) and a second clutch (4). The first clutch (6) is mounted on a first input shaft (25), and the second clutch (4) is mounted on a second input shaft (8). The second input shaft (8) is cylindrical and sleeved outside the first input shaft (25). In the fixed axis gear train, the first input shaft (25) is supported on the transmission case (21) and passes through the second input shaft (8) to be connected with the first clutch (6). The first input shaft (25) is mounted with an intermediate driven gear (9) through a spline; the second input shaft (8) is cylindrical and sleeved on the first input shaft (25) through a bearing. The second input shaft (8) is mounted with a low-speed driving gear (7) and a high-speed driving gear (5) through a spline. The second input shaft (8) is supported on the transmission case (21). 1); a reverse gear synchronizer (2), a reverse gear (1) and a reverse gear intermediate driving gear (10) are installed on the reverse gear shaft (3); the reverse gear (1) is loosely mounted on the reverse gear shaft and can rotate relative to the reverse gear shaft (3); the reverse gear intermediate gear (10) is installed on the reverse gear shaft (3) through a spline; the reverse gear intermediate gear (10) cooperates with the intermediate driven gear (9) to transmit the power of the reverse gear shaft (3) to the first input shaft (25); and both ends of the reverse gear shaft (3) are supported on The transmission case (21) is provided with a forward high-speed gear synchronizer (12), a high-speed gear driven gear (13), a one-way clutch (14), a low-speed gear driven gear (15) and a forward gear intermediate driving gear (16). The high-speed gear driven gear (13) is loosely sleeved on the forward gear shaft (11). The low-speed gear driven gear (15) is installed on the forward gear shaft (11) through the one-way clutch (14). The forward high-speed gear synchronizer (12) is used to control whether the high-speed gear driven gear (13) rotates together with the forward gear shaft (11). The one-way clutch (14) is used to control whether the low-speed gear driven gear (15) rotates together with the forward gear shaft (11). The forward gear intermediate driving gear (16) is installed on the forward gear shaft (11) through a spline. The forward gear intermediate driving gear (16) and the intermediate driven gear (9) cooperate to transmit the power of the forward gear shaft (11) to the first input shaft (25). Preferably, the transmission ratio of the high-speed driving gear (5) to the intermediate driven gear (9) is in the range of 0.2-0.5, and the transmission ratio of the low-speed driving gear (7) to the intermediate driven gear (9) is in the range of 1.2-1.5.The input shaft in the planetary gear system is the first input shaft (25), and the rear planetary gear carrier (23) is loosely sleeved on the input shaft (25) and can rotate relative to the input shaft (25); the front planetary gear ring (30) is sleeved on the input shaft (25) through a cylindrical front planetary gear ring shaft (32), the front planetary gear ring shaft (32) is formed with an external spline, the front planetary gear clutch driven plate (17) is formed with an internal spline, and the front planetary gear clutch driven plate (31) is installed on the front planetary gear ring shaft (32) through the spline; the front planetary gear ring (30) is equipped with a front planetary gear ring brake (18) for achieving braking of the front planetary gear ring; the front planetary gear clutch driving plate (17) is fixed on the first input shaft (25) through the spline. The rear planetary gear ring (20) is integrally connected with the front planetary gear carrier (28), and the rear planetary gear ring (20) is provided with a rear planetary gear ring brake (27) for braking the rear planetary gear ring (20); the front planetary gear sun gear (29) and the rear planetary gear sun gear (26) are both mounted on the first input shaft (25) through splines; and the output gear (24) is fixed on the rear planetary carrier (23) to output power to the outside.

[0010] Working principle of the present invention:

[0011] In the first gear, the second clutch and the rear planetary gear ring brake are engaged, and the power is transmitted to the rear planetary gear sun gear, the rear planetary gear and the rear planetary gear carrier through the second input shaft, the low gear driving gear, the low gear driven gear, the one-way clutch, the forward gear shaft, the forward gear intermediate driving gear, the intermediate driven gear, and the first input shaft, and then output through the output gear. At this time, the rear planetary gear ring is locked, and the first gear transmission ratio is i=i 低 *i 行星 ,i 低 It is the transmission ratio from the low-speed driving gear to the intermediate driven gear. 行星 =1+α2, α2 is the gear ratio between the rear planetary gear ring and the rear planetary gear sun gear.

[0012] In the second gear, the first clutch and the rear planetary gear ring brake are engaged, and the power is transmitted to the rear planetary sun gear, the rear planetary gear and the rear planetary carrier through the first input shaft, and output through the output gear. At this time, the rear planetary gear ring is locked, and the second gear ratio is i=i 行星 =1+α2.

[0013] In the third gear, the second clutch and the front planetary gear ring brake are engaged. The power passes through the second input shaft, the low-speed gear driving gear, the low-speed gear driven gear, the one-way clutch, the forward gear gear shaft, the forward gear intermediate driving gear, the intermediate driven gear, and the first input shaft. After entering the first input shaft, the power is divided into two transmission paths. One path is transmitted to the rear planetary gear sun gear, the rear planetary gear and the rear planetary gear carrier, and the other path is transmitted to the front planetary gear sun gear, the front planetary gear, the front planetary gear carrier, the rear planetary gear ring and the rear planetary gear carrier, and is output through the output gear; at this time, the third gear transmission ratio is i=i 低 *i 行星 ,i 行星 =(1+α1)(1+α2) / 1+α2+α1. α1 is the gear ratio of the front planetary gear ring to the front planetary gear sun gear.

[0014] In the fourth gear, the first clutch and the front planetary gear ring brake are engaged. After the power enters the first input shaft, the power is divided into two transmission paths. One path is transmitted to the rear planetary gear sun gear, the rear planetary gear and the rear planetary gear carrier, and the other path is transmitted to the front planetary gear sun gear, the front planetary gear, the front planetary gear carrier, the rear planetary gear ring and the rear planetary gear carrier, and output through the output gear; at this time, the gear ratio is i=i 行星 =(1+α1)(1+α2) / 1+α2+α1.

[0015] In the fifth gear, the second clutch and the front planetary gear clutch are engaged, and the power is transmitted through the second input shaft, the low-speed gear driving gear, the low-speed gear driven gear, the one-way clutch, the forward gear gear shaft, the forward gear intermediate driving gear, the intermediate driven gear, and the first input shaft. Due to the engagement of the front planetary gear clutch, the front planetary gear sun gear, the front planetary gear ring and the front planetary gear carrier, the rear planetary gear sun gear, the rear planetary gear ring and the rear planetary gear carrier are connected as a whole, and then output through the output gear; at this time, i 行星 =1 Therefore, the fifth gear ratio is i=i 低 .

[0016] In the sixth gear, the first clutch and the front planetary gear clutch are engaged, and the power is input through the first input shaft. As the front planetary gear clutch is engaged, the front planetary gear sun gear, the front planetary gear ring and the front planetary gear carrier, the rear planetary gear sun gear, the rear planetary gear ring and the rear planetary gear carrier are connected as a whole, and the power is output through the output gear. At this time, i 行星 =1 Therefore, the fifth gear ratio is i=i 行星 =1.

[0017] In the seventh gear, the second clutch, the forward high-speed gear synchronizer and the rear planetary gear ring brake are engaged, and the one-way clutch is automatically disengaged; the power is transmitted to the rear planetary gear sun gear, the rear planetary gear and the rear planetary gear carrier through the second input shaft, the high-speed gear driving gear, the high-speed gear driven gear, the forward high-speed gear synchronizer, the forward gear shaft, the forward gear intermediate driving gear, the intermediate driven gear, and the first input shaft, and then output through the output gear. At this time, the rear planetary gear ring is locked, and the seventh gear transmission ratio is i=i 高 *i 行星 ,i 高 is the transmission ratio from the high-speed driving gear to the intermediate driven gear, i 行星 =1+α2.

[0018] In the eighth gear, the second clutch, the forward high-speed gear synchronizer and the rear planetary gear ring brake are engaged, and the one-way clutch is automatically disengaged; the power is divided into two transmission paths after passing through the second input shaft, the high-speed gear driving gear, the high-speed gear driven gear, the forward high-speed gear synchronizer, the forward gear gear shaft, the forward gear intermediate driving gear, the intermediate driven gear, and the first input shaft. One path is transmitted to the rear planetary gear sun gear, the rear planetary gear and the rear planetary gear carrier, and the other path is transmitted to the front planetary gear sun gear, the front planetary gear, the front planetary gear carrier, the rear planetary gear ring and the rear planetary gear carrier, and output through the output gear; at this time, the third gear transmission ratio is i=i 高 *i 行星 ,i 行星 =(1+α1)(1+α2) / 1+α2+α1.

[0019] Ninth gear, second clutch, forward high gear synchronizer and engaged, one-way clutch automatically disengaged; power passes through second input shaft, high gear driving gear, high gear driven gear, forward high gear synchronizer, forward gear gear shaft, forward gear intermediate driving gear, intermediate driven gear, first input shaft, and due to the engagement of front planetary gear clutch, front planetary gear sun gear, front planetary gear ring and front planetary gear carrier, rear planetary gear sun gear, rear planetary gear ring and rear planetary gear carrier are connected as a whole, and then output through output gear; at this time, i 行星 =1 Therefore, the ninth gear ratio is i=i 高 .

[0020] Neutral, dual clutch disengagement or the front planetary gear clutch and the front and rear planetary gear ring brakes are all disengaged, power transmission is interrupted to achieve neutral.

[0021] In the first reverse gear, the second clutch, reverse synchronizer and rear planetary gear ring brake are engaged, and the power is transmitted to the rear planetary sun gear, rear planetary gear and rear planetary carrier through the second input shaft, reverse gear, reverse synchronizer, reverse gear shaft, reverse intermediate gear and first input shaft, and then output through the output gear. At this time, the rear planetary gear ring is locked, and the reverse gear ratio is i=i 倒 *i 行星 ,i 倒 is the transmission ratio from the reverse gear driving gear to the intermediate driven gear, i 行星 =1+α2, α2 is the gear ratio between the rear planetary gear ring and the rear planetary gear sun gear.

[0022] In the reverse second gear, the second clutch, reverse synchronizer and front planetary gear ring brake are engaged, and the power passes through the second input shaft, reverse gear, reverse synchronizer, reverse gear shaft, reverse intermediate gear and first input shaft. After entering the first input shaft, the power is divided into two transmission paths, one path is transmitted to the rear planetary gear sun gear, rear planetary gear and rear planetary gear carrier, and the other path is transmitted to the front planetary gear sun gear, front planetary gear, front planetary gear carrier, rear planetary gear ring and rear planetary gear carrier, and output through the output gear; at this time, the reverse second gear transmission ratio is i=i 倒 *i 行星 ,i 行星 =(1+α1)(1+α2) / 1+α2+α1.

[0023] In the reverse third gear, the second clutch, the reverse synchronizer and the front planetary gear clutch are engaged, and the power is transmitted through the second input shaft, the reverse gear, the reverse synchronizer, the reverse gear shaft, the reverse intermediate gear and the first input shaft. Due to the engagement of the front planetary gear clutch, the front planetary gear sun gear is connected with the front planetary gear ring and the front planetary gear carrier, the rear planetary gear sun gear, the rear planetary gear ring and the rear planetary gear carrier are connected as a whole, and then output through the output gear; at this time, i 行星 =1 Therefore, the reverse third gear ratio is i=i 低 .

Claims

1. A nine-speed dual-clutch transmission, characterized in that: The structure of the nine-speed dual-clutch transmission is composed of a housing, a dual clutch, a fixed-axis gear train and a planetary gear train, wherein the dual clutch is composed of a first clutch and a second clutch, the first clutch is mounted on the first input shaft, and the second clutch is mounted on the second input shaft.

2. The nine-speed dual clutch transmission according to claim 1, characterized in that: The fixed-axis gear train of the nine-speed dual-clutch transmission consists of a first input shaft, a second input shaft, a reverse gear shaft, a forward gear shaft, and gears, synchronizers, and one-way clutches mounted thereon; the first input shaft is supported on the transmission case and passes through the second input shaft to be connected to the first clutch, and the first input shaft is equipped with an intermediate driven gear through a spline; the second input shaft is cylindrical and is sleeved on the first input shaft through a bearing, and the second input shaft is equipped with a low-speed driving gear and a high-speed driving gear through a spline, and the second input shaft is supported on the transmission case; the reverse gear shaft is equipped with a reverse synchronizer, a reverse gear, and a reverse intermediate gear. The reverse gear shaft is provided with an intermediate driving gear, and the reverse gear is loosely sleeved thereon and can rotate relative to the reverse gear shaft. The reverse gear intermediate gear is installed on the reverse gear shaft through a spline. The reverse gear intermediate driving gear cooperates with the intermediate driven gear to transmit the power of the reverse gear shaft to the first input shaft. Both ends of the reverse gear shaft are supported on the transmission case. The forward gear shaft is provided with a forward high-speed synchronizer, a high-speed driven gear, a one-way clutch, a low-speed driven gear and a forward intermediate driving gear. The high-speed driven gear is loosely sleeved on the forward gear shaft, and the low-speed driven gear is installed on the forward gear shaft through a one-way clutch and can rotate relative to it. The forward high-speed gear synchronizer is used to control whether the high-speed gear driven gear rotates together with the forward gear shaft. The one-way clutch is used to control whether the low-speed gear driven gear rotates together with the forward gear shaft. The forward gear intermediate driving gear is installed on the forward gear shaft through a spline. The forward gear intermediate driving gear and the intermediate driven gear cooperate to transmit the power of the forward gear shaft to the first input shaft.

3. The nine-speed dual clutch transmission according to claim 1, characterized in that: The planetary gear system of the nine-speed dual-clutch transmission consists of an input shaft, a front planetary row, a rear planetary row, a front planetary row clutch, a front planetary row gear ring brake, a rear planetary row gear ring brake and an output gear; wherein the input shaft is the first input shaft, and the front planetary row and the rear planetary row each include a set of gear rings, planetary gears, a sun gear and a planet carrier; the rear planetary row planet carrier is loosely sleeved on the first input shaft and can rotate relative to the input shaft; the front planetary row gear ring is sleeved on the first input shaft through a cylindrical front planetary row gear ring shaft, and the front planetary row gear ring shaft is provided with an external spline, and the front planetary row clutch consists of a front planetary row clutch active plate and a front planetary row clutch driven plate The front planetary gear ring is composed of a front planetary gear ring and a rear planetary gear ring. The front planetary gear ring is provided with a front planetary gear ring brake for braking the front planetary gear ring. The rear planetary gear ring is integrated with the front planetary gear ring carrier, and the rear planetary gear ring is provided with a rear planetary gear ring brake for braking the rear planetary gear ring. Both the front planetary gear ring and the rear planetary gear ring are installed on the first input shaft through splines. The output gear is fixed on the rear planetary gear ring to output power to the outside.

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