A speed change system for a new type of eight-speed gearbox

Abstract

The present invention discloses a speed change system of a novel eight-speed gearbox, which includes an input shaft, an output shaft, an intermediate shaft, a reverse gear shaft, a first gear, a second gear, a third gear, a reverse gear, a reverse reversing gear, a basic gear, a first and second gear synchronizer, a third and fourth gear synchronizer, a reverse gear synchronizer, a high and low gear synchronizer, a first gear shaft gear, a second gear shaft gear, a third gear shaft gear, a reverse gear shaft gear, a basic gear shaft gear, and the input shaft and the output shaft are coaxially arranged; the original fourth gear and the high-speed gear are shared, and the original fourth gear shaft gear and the high-speed gear shaft gear are shared; when the high and low gear synchronizer is combined with the basic gear, the output shaft can output the reverse speed and the forward speeds of the first, second, third, and fourth gears; when the high and low gear synchronizer is combined with the fourth - high-speed gear, the forward speeds of the first, second, and third gears can be respectively increased to the forward speeds of the fifth, sixth, and seventh gears for output, and the forward speed of the fourth gear can be directly increased to the forward speed of the eighth gear for output.

Description

Technical Field

[0001] The present invention relates to a speed change system of a new type of eight-speed transmission, belonging to the technical field of automotive transmissions. Background Art

[0002] As a key mechanism of the automotive transmission system, the transmission ranks second only to the engine in the vehicle. To continuously meet higher development requirements, the industry has never stopped improving the transmission. It is precisely because of continuous improvements over a long period that the room for each improvement is very limited, and it is difficult to have a subversive major change. Therefore, even a very small improvement that has achieved actual results in the industry is considered a significant contribution to the development of the transmission.

[0003] Currently, with the implementation of the National VI emission regulations and the continuous improvement of road conditions, the multi-gear of transmissions is the general trend, and the future requirements for the transmission market in China have also changed accordingly. However, the current eight-speed transmission in the transmission market has a complex structure, many secondary gear transmissions, resulting in a large operating inertia, which in turn causes large shifting resistance, low output efficiency (high energy consumption), and a relatively heavy self-weight. It can neither meet the requirements of energy conservation and emission reduction nor reduce the manufacturing and maintenance costs.

[0004] The improvement made by the present invention is directed to an advanced eight-speed transmission in the following prior art:

[0005] As Figure 2 shown, it includes a main case 100 and a secondary case 200. The main case 100 includes a reverse gear mechanism, and four forward gear mechanisms including a first gear mechanism, a second gear mechanism, a third gear mechanism, and a fourth gear mechanism. The secondary case 200 includes a basic gear mechanism and a high-speed gear mechanism. The basic gear mechanism outputs the reverse speed corresponding to the reverse gear mechanism input by the main case 100 and the first, second, third, and fourth forward speeds corresponding to the first gear mechanism, second gear mechanism, third gear mechanism, and fourth gear mechanism input by the main case 100 respectively. The high-speed gear mechanism outputs the forward speeds corresponding to the first gear mechanism, second gear mechanism, third gear mechanism, and fourth gear mechanism input by the main case 100 after being increased to the forward speeds corresponding to the fifth, sixth, seventh, and eighth gears respectively.

[0006] The specific structure of the eight-speed transmission speed change system:

[0007] Shafts: including a main case input shaft 1, a main case intermediate shaft 3, a reverse shaft 14, an output / input shaft 11, a secondary case output shaft 4, and a secondary case intermediate shaft 5.

[0008] Shifting gears: a first gear 21, a second gear 22, a third gear 23, a fourth gear 241, a reverse gear 26, a reverse reversing gear 27, a basic gear 25, and a high-speed gear 242.

[0009] Synchronizers: the first and second gear synchronizer 41, the third and fourth gear synchronizer 42, the reverse gear synchronizer 43, the high and low gear synchronizer 44.

[0010] Shaft gears: the first gear shaft gear 31, the second gear shaft gear 32, the third gear shaft gear 33, the fourth gear shaft gear 341, the reverse gear shaft gear 36, the basic gear shaft gear 35, the high-speed gear shaft gear 342.

[0011] The front section of the main box input shaft 1, the main box intermediate shaft 3, the reverse gear shaft 14, and the output - input shaft 2 is located in the main box. The rear section of the auxiliary box output shaft 4, the auxiliary box intermediate shaft 5, and the output - input shaft 2 is located in the auxiliary box 200. The main box input shaft 1, the output - input shaft 2, and the auxiliary box output shaft 4 are coaxially arranged; the main box intermediate shaft 3 and the auxiliary box intermediate shaft 5 are coaxially arranged.

[0012] In the main box 100, the first gear 21, the second gear 22, the third gear 23, and the reverse gear 26 are arranged on the front section of the output - input shaft 2 in the main box 100 through the first bearing 6. The fourth gear 241 is fixedly arranged on the input shaft 11. The first gear shaft gear 31, the second gear shaft gear 32, the third gear shaft gear 33, and the fourth gear shaft gear 341 are all fixedly arranged on the main box intermediate shaft 3 and are respectively meshed with the first gear 21, the second gear 22, the third gear 23, and the fourth gear 241. The first and second gear synchronizer 41 is arranged on the output - input shaft 2 between the first gear 21 and the second gear 22. The third and fourth gear synchronizer 42 is arranged on the output - input shaft 2 between the third gear 23 and the fourth gear 241. The reverse gear reversing gear 27 is respectively meshed with the reverse gear shaft gear 36 and the reverse gear 26.

[0013] In the auxiliary box 200, the high-speed gear 242 is fixedly arranged on the rear section of the output - input shaft 2. The basic gear 25 is arranged on the auxiliary box output shaft 4 through the first bearing 6. The basic gear shaft gear 35 and the high-speed gear shaft gear 342 are fixedly arranged on the auxiliary box intermediate shaft 5, and the basic gear shaft gear 35 and the high-speed gear shaft gear 342 are respectively meshed with the basic gear 25 and the high-speed gear 242. The high and low gear synchronizer 44 is arranged on the auxiliary box intermediate shaft 5 between the basic gear 25 and the high-speed gear 242. Summary of the Invention

[0014] The technical problem to be solved by the present invention is: how to reduce the transmission secondary stage, lower the running inertia, so as to improve the output efficiency and achieve easy shifting.

[0015] In view of the above problems, the technical solution proposed by the present invention is:

[0016] A speed change system of a new type of eight-speed gearbox, including an input shaft, an output shaft, an intermediate shaft, a reverse gear shaft, a first gear, a second gear, a third gear, a reverse gear, a reverse gear reversing gear, a basic gear, a first and second gear synchronizer, a third and fourth gear synchronizer, a reverse gear synchronizer, a high and low gear synchronizer, a first gear shaft gear, a second gear shaft gear, a third gear shaft gear, a reverse gear shaft gear, a basic gear shaft gear. The input shaft and the output shaft are coaxially arranged, and the intermediate shaft and the reverse gear shaft are respectively parallel to the input shaft and the output shaft; it also includes a fourth gear and a high-speed gear integrated fourth gear • high-speed gear, and a fourth gear shaft gear and a high-speed gear shaft gear integrated fourth gear • high-speed shaft gear; a socket hole is axially arranged at the rear end of the input shaft, and the front end of the output shaft is installed in the socket hole; the fourth gear • high-speed gear and the basic gear are respectively arranged on the output shaft before and after through a bearing one, the fourth gear • high-speed shaft gear and the basic gear shaft gear are fixedly arranged on the intermediate shaft and respectively mesh with the fourth gear • high-speed gear and the basic gear, and the high and low gear synchronizer is arranged between the basic gear and the fourth gear • high-speed gear; the third gear is arranged on the output shaft in front of the fourth gear • high-speed gear through a bearing one, and the third and fourth gear synchronizer is arranged between the third gear and the fourth gear • high-speed gear; the first gear shaft gear and the second gear shaft gear are fixedly arranged on the input shaft in front of the third gear before and after, the first gear and the second gear are respectively arranged on the intermediate shaft in front of the third gear shaft gear before and after through a bearing one and respectively mesh with the first gear shaft gear and the second gear shaft gear, and the first and second gear synchronizer is arranged between the first gear and the second gear; the reverse gear shaft gear is fixedly arranged at the front end of the input shaft, the reverse gear is arranged on the intermediate shaft in front of the first gear through a bearing one, and the reverse gear reversing gear is arranged on the reverse gear shaft and respectively meshes with the reverse gear shaft gear and the reverse gear; when the high and low gear synchronizer is combined with the basic gear, the output shaft can output the reverse speed transmitted by the intermediate shaft and the basic gear shaft gear and the forward speeds of the first, second, third, and fourth gears; when the high and low gear synchronizer is combined with the fourth gear • high-speed gear, the forward speeds of the first, second, and third gears transmitted by the intermediate shaft and the fourth gear • high-speed shaft gear can be respectively increased to the forward speeds of the fifth, sixth, and seventh gears and output, and the forward speed of the fourth gear can be directly increased to the forward speed of the eighth gear and output. Brief Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the speed change system of the eight-speed gearbox described in the present invention;

[0018] Figure 2 It is a schematic structural diagram of the speed change system of an advanced eight-speed gearbox in the prior art.

[0019] In the figure: 100, main box; 200, auxiliary box; 1, main box input shaft; 2, output / input shaft; 3, main box intermediate shaft; 4, auxiliary box output shaft; 5, auxiliary box intermediate shaft; 6, bearing one; 7, bearing two; 8, bearing three; 9, socket hole; 11, input shaft; 12, output shaft; 13, intermediate shaft; 14, reverse gear shaft; 21, first gear; 22, second gear; 23, third gear; 24, fourth / high-speed gear; 241, fourth gear; 242, high-speed gear; 25, basic gear; 26, reverse gear; 27, reverse gear reversing gear; 31, first gear shaft gear; 32, second gear shaft gear; 33, third gear shaft gear; 34, fourth / high-speed shaft gear; 341, fourth shaft gear; 342, high-speed shaft gear; 35, basic gear shaft gear; 36, reverse gear shaft gear; 41, first / second gear synchronizer; 42, third / fourth gear synchronizer; 43, reverse gear synchronizer; 44, high / low gear synchronizer. Detailed implementation mode

[0020] The present invention will be further described below in conjunction with embodiments and the accompanying drawings:

[0021] As Figure 1As shown in the figure, a speed change system of a new type of eight-speed gearbox includes an input shaft 11, an output shaft 12, an intermediate shaft 13, a reverse gear shaft 14, a first gear 21, a second gear 22, a third gear 23, a reverse gear 26, a reverse reversing gear 27, a basic gear 25, a first and second gear synchronizer 41, a third and fourth gear synchronizer 42, a reverse gear synchronizer 43, a high and low gear synchronizer 44, a first gear shaft tooth 31, a second gear shaft tooth 32, a third gear shaft tooth 33, a reverse gear shaft tooth 36, a basic gear shaft tooth 35. The input shaft 11 and the output shaft 12 are coaxially arranged, and the intermediate shaft 13 and the reverse gear shaft 14 are respectively parallel to the input shaft 11 and the output shaft 12. It is characterized in that: it also includes a fourth gear and a high-speed gear integrated fourth gear • high-speed gear 24, a fourth gear shaft tooth and a high-speed gear shaft tooth integrated fourth gear • high-speed shaft tooth 34; a socket hole 9 is axially arranged at the rear end of the input shaft 11, and the front end of the output shaft 12 is installed in the socket hole 9; the fourth gear • high-speed gear 24 and the basic gear 25 are respectively arranged on the output shaft 12 before and after through a first bearing 6, and the fourth gear • high-speed shaft tooth 34 and the basic gear shaft tooth 35 are fixedly arranged on the intermediate shaft 13 and respectively mesh with the fourth gear • high-speed gear 24 and the basic gear 25, and the high and low gear synchronizer 44 is arranged between the basic gear 25 and the fourth gear • high-speed gear 24; the third gear 23 is arranged on the output shaft 12 in front of the fourth gear • high-speed gear 24 through a first bearing 6, and the third and fourth gear synchronizer 42 is arranged between the third gear 23 and the fourth gear • high-speed gear 24; the first gear shaft tooth 31 and the second gear shaft tooth 32 are fixedly arranged on the input shaft 11 in front of the third gear 23 before and after, and the first gear 21 and the second gear 22 are respectively arranged on the intermediate shaft 13 in front of the third gear shaft tooth 33 before and after through a first bearing 6 and respectively mesh with the first gear shaft tooth 31 and the second gear shaft tooth 32, and the first and second gear synchronizer 41 is arranged between the first gear 21 and the second gear 22; the reverse gear shaft tooth 36 is fixedly arranged at the front end of the input shaft 11, the reverse gear 26 is arranged on the intermediate shaft 13 in front of the first gear 21 through a first bearing 6, and the reverse reversing gear 27 is arranged on the reverse gear shaft 14 and respectively meshes with the reverse gear shaft tooth 36 and the reverse gear 26; when the high and low gear synchronizer 44 is combined with the basic gear 25, the output shaft 12 can output the reverse rotation speed transmitted by the intermediate shaft 13 and the basic gear shaft tooth 35 and the forward speeds of the first, second, third, and fourth gears; when the high and low gear synchronizer 44 is combined with the fourth gear • high-speed gear 24, the forward speeds of the first, second, and third gears transmitted by the intermediate shaft 13 and the fourth gear • high-speed shaft tooth 34 can be respectively increased to the forward speeds of the fifth, sixth, and seventh gears for output, and the forward speed of the fourth gear can be directly increased to the forward speed of the eighth gear for output.

[0022] Next, we take the second gear, sixth gear, fourth gear, and eighth gear as examples to illustrate the transmission path of the above speed change system.

[0023] When the high and low gear synchronizer 44 is combined with the basic gear 25:

[0024] Transmission path for the speed corresponding to the second gear: Input shaft 11 - Second gear shaft gear 32 - Second gear 22 - First and second gear synchronizer 41 - Intermediate shaft 13 - Basic gear shaft gear 35 - Basic gear 25 - High and low gear synchronizer 44 - Output shaft 12 for output.

[0025] Transmission path for the speed corresponding to the fourth gear: Input shaft 11 - Third and fourth gear synchronizer 42 - Fourth gear • High-speed gear 24 - Fourth gear • High-speed shaft gear 34 - Intermediate shaft 13 - Basic gear shaft gear 35 - Basic gear 25 - High and low gear synchronizer 44 - Output shaft 12 for output.

[0026] When the high and low gear synchronizer 44 is combined with the fourth gear • high-speed gear 24:

[0027] Transmission path for the speed corresponding to the sixth gear: Input shaft 11 - Second gear shaft gear 32 - Second gear 22 - First and second gear synchronizer 41 - Intermediate shaft 13 - Fourth gear • High-speed shaft gear 34 - Fourth gear • High-speed gear 24 - High and low gear synchronizer 44 - Output shaft 12 for output.

[0028] Transmission path for the speed corresponding to the eighth gear: Input shaft 11 - Third and fourth gear synchronizer 42 - Fourth gear • High-speed gear 24 - High and low gear synchronizer 44 - Output shaft 12 for output.

[0029] For the transmission paths of other first, third, fifth, and seventh gears, analogize according to the structural view.

[0030] It can be seen from the above structural relationship that compared with the advanced eight-speed gearbox in the prior art, the eight-speed gearbox speed change system designed by the present invention has two fewer drive shafts, and also lacks the fourth gear 241 and the fourth gear shaft gear 341. The components are significantly reduced, the structure is significantly simplified, the running inertia is significantly reduced, thereby significantly improving the output efficiency and achieving easy gear shifting. At the same time, it can also reduce the weight of the box body and the manufacturing cost.

[0031] Preferably, the third and fourth gear synchronizer 42 is arranged on the input shaft 11 at the position where the socket hole 9 is located, but it can also be arranged at the rear end of the output shaft 12.

[0032] A second bearing 7 for installing the front end of the output shaft 12 is provided in the socket hole 9.

[0033] The input shaft 11, the output shaft 12, and the intermediate shaft 13 are all installed on the eight-speed gearbox housing through the third bearing 8.

[0034] The improved eight-speed transmission still consists of a main case 100 and an auxiliary case 200. The front section of the input shaft 11 is mounted on the front wall of the main case 100 through bearing three 8, and the rear section is mounted on the partition wall between the main case 100 and the auxiliary case 200 through bearing three 8; the rear section of the output shaft 12 is mounted on the rear wall of the auxiliary case 200 through bearing three 8; the front section of the intermediate shaft 13 is mounted on the front wall of the main case 100 through bearing three 8, the middle section is mounted on the partition wall between the main case 100 and the auxiliary case 200 through bearing three 8, and the rear end is mounted on the rear wall of the auxiliary case 200 through bearing three 8.

[0035] The third-gear gear 23, the third-fourth gear synchronizer 42, the third-gear shaft gear 33, the fourth-high-speed gear 24, the fourth-high-speed shaft gear 34, the high-low gear synchronizer 44, the basic-gear gear 25, and the basic-gear shaft gear 35 are all arranged in the auxiliary case 200.

[0036] The above embodiments are only used to describe the present invention more clearly and should not be regarded as limiting the protection scope covered by the present invention. Any modification in an equivalent form should be regarded as falling within the protection scope covered by the present invention.

Claims

1. A speed change system of a new type of eight-speed gearbox, comprising an input shaft (11), an output shaft (12), an intermediate shaft (13), a reverse gear shaft (14), a first gear (21), a second gear (22), a third gear (23), a reverse gear (26), a reverse reversing gear (27), a basic gear (25), a first and second gear synchronizer (41), a third and fourth gear synchronizer (42), a reverse gear synchronizer (43), a high and low gear synchronizer (44), a first gear shaft gear (31), a second gear shaft gear (32), a third gear shaft gear (33), a reverse gear shaft gear (36), a basic gear shaft gear (35), the input shaft (11) and the output shaft (12) are coaxially arranged, and the intermediate shaft (13) and the reverse gear shaft (14) are respectively parallel to the input shaft (11) and the output shaft (12), Characterized in that: It also includes a four-speed and high-speed gear (24) that combines the four-speed gear and the high-speed gear, and a four-speed • high-speed shaft gear (34) that combines the four-speed shaft gear and the high-speed gear shaft; a socket hole (9) is axially provided at the rear end of the input shaft (11), and the front end of the output shaft (12) is installed in the socket hole (9); the four-speed • high-speed gear (24) and the basic gear (25) are respectively arranged on the output shaft (12) before and after through a first bearing (6), the four-speed • high-speed shaft gear (34) and the basic gear shaft (35) are fixedly arranged on the intermediate shaft (13) and respectively mesh with the four-speed • high-speed gear (24) and the basic gear (25), and a high-low gear synchronizer (44) is arranged between the basic gear (25) and the four-speed • high-speed gear (24); the third gear (23) is arranged on the output shaft (12) in front of the four-speed • high-speed gear (24) through a first bearing (6), and a third-fourth gear synchronizer (42) is arranged between the third gear (23) and the four-speed • high-speed gear (24); the first gear shaft tooth (31) and the second gear shaft tooth (32) are fixedly arranged before and after on the input shaft (11) in front of the third gear (23), the first gear (21) and the second gear (22) are respectively arranged on the intermediate shaft (13) in front of the third gear shaft (33) before and after through a first bearing (6) and respectively mesh with the first gear shaft tooth (31) and the second gear shaft tooth (32), and a first-second gear synchronizer (41) is arranged between the first gear (21) and the second gear (22); the reverse gear shaft tooth (36) is fixedly arranged at the front end of the input shaft (11), the reverse gear (26) is arranged on the intermediate shaft (13) in front of the first gear (21) through a first bearing (6), and the reverse gear reversing gear (27) is arranged on the reverse shaft (14) and respectively meshes with the reverse gear shaft tooth (36) and the reverse gear (26); when the high-low gear synchronizer (44) is combined with the basic gear (25), the output shaft (12) can output the reverse speed transmitted by the intermediate shaft (13) and the basic gear shaft (35) and the forward speeds of the first, second, third, and fourth gears; when the high-low gear synchronizer (44) is combined with the four-speed • high-speed gear (24), the forward speeds of the first, second, and third gears transmitted by the intermediate shaft (13) and the four-speed • high-speed shaft gear (34) can be respectively increased to the forward speeds of the fifth, sixth, and seventh gears and output, and the forward speed of the fourth gear can be directly increased to the forward speed of the eighth gear and output.

2. The speed change system of a new type of eight-speed gearbox according to claim 1, characterized in that: the third-fourth gear synchronizer (42) is arranged on the input shaft (11) at the position where the socket hole (9) is located.

3. The speed change system of a new type of eight-speed gearbox according to claim 1, characterized in that: the third-fourth gear synchronizer (42) is arranged at the rear end of the output shaft (12).

4. The speed change system of a new type of eight-speed gearbox according to claim 1, characterized in that: a second bearing (7) for installing the front end of the output shaft (12) is provided in the socket hole (9).

5. The speed change system of a new type of eight-speed gearbox according to claim 1, characterized in that: The input shaft (11), output shaft (12), and intermediate shaft (13) are all installed on the eight-speed transmission housing through bearing three (8).

6. A speed change system for a new type of eight-speed transmission according to claim 5, characterized in that: The eight-speed transmission is divided into a main case (100) and a secondary case (200). The front section of the input shaft (11) is installed on the front wall of the main case (100) through bearing three (8), and the rear section is installed on the partition wall between the main case (100) and the secondary case (200) through bearing three (8); the rear section of the output shaft (12) is installed on the rear wall of the secondary case (200) through bearing three (8); the front section of the intermediate shaft (13) is installed on the front wall of the main case (100) through bearing three (8), the middle section is installed on the partition wall between the main case (100) and the secondary case (200) through bearing three (8), and the rear end is installed on the rear wall of the secondary case (200) through bearing three (8).

7. A speed change system for a new type of eight-speed transmission according to claim 6, characterized in that: The third gear (23), third-fourth gear synchronizer (42), third gear shaft gear (33), fourth gear - high-speed gear (24), fourth gear - high-speed shaft gear (34), high-low gear synchronizer (44), basic gear (25), and basic gear shaft gear (35) are all arranged in the secondary case (200).

Images