阅读说明：本技术 一种乘用车变速箱 (Passenger car gearbox ) 是由 李玉良 王巍济 于 2020-04-28 设计创作，主要内容包括：本发明涉及一种乘用车变速箱,包括输入轴、输出轴、一个标准拉维娜结构和二个基本行星排,所述输入轴上连接有第一行星排和第二行星排,所述输出轴上连接有第四行星排,第三行星排通过四个离合器分别与第二行星排和第四行星排连接,第一行星排和第四行星排均设置有一个制动器,通过不同离合器和制动器的结合和分离,可实现不同挡位的切换。本发明提出的乘用车用变速箱通过四个行星排实现前进八挡和后退一挡的换挡功能,零件较少,通过使用标准拉维娜结构可以有效的减少结构尺寸,并实现较多挡位数要求。(The invention relates to a passenger vehicle gearbox which comprises an input shaft, an output shaft, a standard Ravigneaux structure and two basic planet rows, wherein the input shaft is connected with a first planet row and a second planet row, the output shaft is connected with a fourth planet row, the third planet row is respectively connected with the second planet row and the fourth planet row through four clutches, the first planet row and the fourth planet row are respectively provided with a brake, and the switching of different gears can be realized through the combination and the separation of different clutches and brakes. The gearbox for the passenger vehicle provided by the invention realizes the gear shifting functions of eight forward gears and one backward gear through four planet rows, has fewer parts, can effectively reduce the structural size by using a standard Ravigneaux structure, and meets the requirement of more gear numbers.)

1. A passenger car gearbox comprises an input shaft (1), a first planet row (3), a second planet row (4), a third planet row (5), a fourth planet row (6) and an output shaft (2), and is characterized in that,

the first planet row (3) comprises a first sun gear (31), a first gear ring (32), a first planet carrier (33) and a first planet gear (34), the first planet gear (34) is arranged on the first planet carrier (33) and is meshed with the first sun gear (31), a first brake (7) is arranged on the outer portion of the first planet carrier (32), and the input shaft (1) is fixedly connected with the first planet carrier (33);

the second planet row (4) comprises a second sun gear (41) and second planet gears (44), the second sun gear (41) is meshed with the second planet gears (44), a first clutch (9) and a third clutch (11) are arranged outside the second sun gear (41), and the second planet gears (44) are arranged on the first planet carrier (33) and are respectively meshed with the first gear ring (32) and the first planet gears (33);

the fourth planet row (6) comprises a fourth sun gear (61), a third ring gear (62), a third planet carrier (63) and a fourth planet gear (64), the fourth sun gear (61) is fixedly connected with the third sun gear (51), the fourth planet gear (64) is arranged on the third planet carrier (63), the third ring gear (62) is externally provided with a second brake (8), the third planet carrier (63) is provided with a second clutch (10) and a fourth clutch (12), and the output shaft (2) is fixedly connected with the third planet carrier (63);

the third planet row (5) comprises a third sun gear (51), a second gear ring (52), a second planet carrier (53) and a third planet gear (54), the third sun gear (51) is fixedly connected with the first sun gear (31) and meshed with the third planet gear (54), the second gear ring (52) is meshed with the third planet gear (54), and the left side and the right side of the third planet row are respectively provided with the first clutch (9) and the second clutch (10); the left side and the right side of the second planet carrier (53) are respectively provided with the third clutch (11) and the fourth clutch (12); the third planet wheel (54) is arranged on the second planet carrier (54);

the switching of different gears is realized through the connection and the disconnection of the first brake (7), the second brake (8), the first clutch (9), the second clutch (10), the third clutch (11) and the fourth clutch (12).

2. Passenger car gearbox according to claim 1, characterized in that when said second brake (8) is engaged, fixing said third ring gear (62), while said first clutch (9) is engaged, the second sun gear (41) and the second ring gear (52) are connected as one piece, while the third clutch (11) is engaged, the second sun gear (41) and the second planet carrier (53) are connected as one piece, when forward first gear is achieved;

alternatively, the first and second electrodes may be,

when the second brake (8) is engaged, the third ring gear (62) is fixed, meanwhile, the second clutch (10) is engaged, the third planet carrier (63) and the second ring gear (52) are connected into a whole, meanwhile, the third clutch (11) is engaged, the second sun gear (41) and the second planet carrier (53) are connected into a whole, and then, the forward gear and the second gear are realized;

alternatively, the first and second electrodes may be,

when the second brake (8) is engaged, the third ring gear (62) is fixed, meanwhile, the third clutch (11) is engaged, the second sun gear (41) and the second planet carrier (53) are connected into a whole, meanwhile, the fourth clutch (12) is engaged, and the third planet carrier (63) and the second planet carrier (53) are connected into a whole, and then the forward three-gear is realized;

alternatively, the first and second electrodes may be,

when the second brake (8) is engaged, the third gear ring (62) is fixed, meanwhile, the first clutch (9) is engaged, the second sun gear (41) and the second gear ring (52) are connected into a whole, meanwhile, the fourth clutch (12) is engaged, and the third planet carrier (63) and the second planet carrier (53) are connected into a whole, so that the forward fourth gear is realized;

alternatively, the first and second electrodes may be,

when the first clutch (9) is engaged, the second sun gear (41) and the second ring gear (52) are connected into a whole, meanwhile, the second clutch (10) is engaged, the third planet carrier (63) and the second ring gear (52) are connected into a whole, meanwhile, the fourth clutch (12) is engaged, and the third planet carrier (63) and the second planet carrier (53) are connected into a whole, then the forward fifth gear is realized;

alternatively, the first and second electrodes may be,

when the first brake (7) is engaged, the first gear ring (32) is fixed, meanwhile, the first clutch (9) is engaged, the second sun gear (41) and the second gear ring (52) are connected into a whole, meanwhile, the fourth clutch (12) is engaged, and the third planet carrier (63) and the second planet carrier (53) are connected into a whole, and then, the forward sixth gear is realized;

alternatively, the first and second electrodes may be,

when the first brake (7) is engaged, the first gear ring (32) is fixed, meanwhile, the first clutch (9) is engaged, the second sun gear (41) and the second gear ring (52) are connected into a whole, meanwhile, the second clutch (10) is engaged, and the third planet carrier (63) and the second gear ring (52) are connected into a whole, and then, a seventh forward gear is realized;

alternatively, the first and second electrodes may be,

when the first brake (7) is engaged, the first gear ring (32) is fixed, meanwhile, the second clutch (10) is engaged, the third planet carrier (63) and the second gear ring (52) are connected into a whole, meanwhile, the third clutch (11) is engaged, and the second sun gear (41) and the second planet carrier (53) are connected into a whole, so that the forward eight-gear is realized;

alternatively, the first and second electrodes may be,

when the first brake (7) is engaged to fix the first ring gear (32) and the second clutch (10) is engaged, the third carrier (63) and the second ring gear (52) are connected as a unit, and the fourth clutch (12) is engaged and the third carrier (63) and the second carrier (53) are connected as a unit, the reverse gear is realized.

3. The passenger car transmission according to claim 2, wherein the forward-first gear ratio ranges from 2.5 to 5; the transmission ratio range of the forward second gear is 1.6273-4.3455; the transmission ratio range of the forward third gear is 1.4091-3.9091; the transmission ratio range of the forward fourth gear is 0.1515-3.6364; the transmission ratio of the forward fifth gear is 1; the transmission ratio range of the forward six gears is 0.2564-3.3333; the transmission ratio range of the forward seven gears is 0.2-0.4; the transmission ratio range of the forward eight gears is 0.0968-0.3077; the transmission ratio range of the reverse gear is-0.5-3.

4. Passenger car gearbox according to claim 1, characterized in that the first brake (7) and the second brake (8) are both wet multi-disc brakes.

5. Passenger car gearbox according to claim 1, characterized in that the first clutch (9), the second clutch (10), the third clutch (11) and the fourth clutch (12) are all wet multiplate clutches.

Technical Field

The invention relates to the technical field of gearboxes, in particular to a passenger car gearbox.

Background

The transmission is one of important parts of an automobile transmission system, and plays an important place in the development process of automobile products. The main function of the speed changer is to make the passenger car better adapt to various road conditions, adjust the speed of the car in time and meet various driving requirements of the driver. The multi-gear transmission can provide a reasonable gear range in the driving process of an automobile, and the reasonable gear range can meet certain driving comfort, reduce the oil consumption of the automobile and ensure certain economical efficiency. The excellent transmission can greatly improve the performance of automobile products. In order to improve the driving comfort and fuel saving characteristics of automobiles, the development of automatic transmissions is directed toward multi-speed, compact and lightweight transmissions. The multi-gear development mainly considers the dynamic property and fuel property of the automobile, and in terms of the dynamic property, the gears are more, so that the engine can exert the maximum power and use high power as much as possible, and the climbing and accelerating capability of the automobile is improved. The prior market is more applied to hydraulic automatic transmissions, which mainly use a planetary gear mechanism as a transmission device, and the planetary gear mechanism mainly comprises three types: basic planetary gear mechanism, Simpson gear mechanism, Ravigneaux gear mechanism.

However, the existing planetary transmission for passenger vehicles generally adopts 4 rows and more than 4 basic planetary rows to meet the requirement of more gears, for example, in the existing patent document CN101275644A, 4 basic planetary rows are required to meet the requirement of 8 gears, and in the patent document US10053099B2, more basic planetary rows are required to achieve multi-gear speed change, and the number of parts is large, so that the structure of the transmission is too large, and the manufacturing is difficult.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a passenger car gearbox which is simple in structure, uses less parts under the condition of meeting the requirement of multiple gears, reduces the structural complexity, enables the manufacturing and the installation to be simple and easy, and reduces the size of the gearbox.

The technical scheme adopted by the invention for solving the technical problems is as follows: there is provided a passenger car gearbox comprising an input shaft, a first planet row, a second planet row, a third planet row, a fourth planet row and an output shaft, wherein,

the first planet row comprises a first sun gear, a first gear ring, a first planet carrier and a first planet gear, the first planet gear is arranged on the first planet carrier and is meshed with the first sun gear, a first brake is arranged on the outer portion of the first gear ring, and the input shaft is fixedly connected with the first planet carrier;

the second planet row comprises a second sun gear and a second planet gear, the second sun gear is meshed with the second planet gear, a first clutch and a third clutch are arranged outside the second sun gear, and the second planet gear is arranged on the first planet carrier and is respectively meshed with the first gear ring and the first planet gear;

the fourth planet row comprises a fourth sun gear, a third gear ring, a third planet carrier and a fourth planet gear, the fourth sun gear is fixedly connected with the third sun gear, the fourth planet gear is arranged on the third planet carrier, a second brake is arranged on the outer portion of the third gear ring, the third planet carrier is provided with a second clutch and a fourth clutch, and the output shaft is fixedly connected with the third planet carrier;

the third planet row comprises a third sun gear, a second gear ring, a second planet carrier and a third planet gear, the third sun gear is fixedly connected with the first sun gear and is meshed with the third planet gear, the second gear ring is meshed with the third planet gear, and the left side and the right side of the third planet row are respectively provided with the first clutch and the second clutch; the left side and the right side of the second planet carrier are respectively provided with the third clutch and the fourth clutch; the third planet wheel is arranged on the second planet carrier;

and the switching of different gears is realized through the connection and the disconnection of the first brake, the second brake, the first clutch, the second clutch, the third clutch and the fourth clutch.

When the second brake is engaged, the third gear ring is fixed, meanwhile, the first clutch is engaged, the second sun gear and the second gear ring are connected into a whole, and meanwhile, the third clutch is engaged, the second sun gear and the second planet carrier are connected into a whole, so that the forward first gear is realized;

or when the second brake is engaged, the third gear ring is fixed, meanwhile, the second clutch is engaged, the third planet carrier and the second gear ring are connected into a whole, meanwhile, the third clutch is engaged, the second sun gear and the second planet carrier are connected into a whole, and at the moment, the forward gear and the second gear are realized;

or when the second brake is engaged, the third gear ring is fixed, meanwhile, the third clutch is engaged, the second sun gear and the second planet carrier are connected into a whole, and simultaneously, the fourth clutch is engaged, the third planet carrier and the second planet carrier are connected into a whole, so that the forward three gears are realized;

or when the second brake is engaged, the third gear ring is fixed, meanwhile, the first clutch is engaged, the second sun gear and the second gear ring are connected into a whole, and simultaneously, the fourth clutch is engaged, the third planet carrier and the second planet carrier are connected into a whole, so that the forward fourth gear is realized;

or when the first clutch is engaged, the second sun gear and the second ring gear are connected into a whole, meanwhile, the second clutch is engaged, the third planet carrier and the second ring gear are connected into a whole, meanwhile, the fourth clutch is engaged, and the third planet carrier and the second planet carrier are connected into a whole, so that the fifth forward gear is realized;

or when the first brake is engaged, the first gear ring is fixed, meanwhile, the first clutch is engaged, the second sun gear and the second gear ring are connected into a whole, and simultaneously, the fourth clutch is engaged, the third planet carrier and the second planet carrier are connected into a whole, so that the forward six-gear is realized;

or when the first brake is engaged, the first gear ring is fixed, meanwhile, the first clutch is engaged, the second sun gear and the second gear ring are connected into a whole, meanwhile, the second clutch is engaged, and the third planet carrier and the second gear ring are connected into a whole, so that a seventh forward gear is realized;

or when the first brake is engaged, the first gear ring is fixed, meanwhile, the second clutch is engaged, the third planet carrier and the second gear ring are connected into a whole, and meanwhile, the third clutch is engaged, the second sun gear and the second planet carrier are connected into a whole, so that the forward eight-gear is realized;

or when the first brake is engaged to fix the first gear ring, the second clutch is engaged to integrally connect the third planet carrier and the second gear ring, and the fourth clutch is engaged to integrally connect the third planet carrier and the second planet carrier, the reverse gear is realized.

The transmission ratio range of the forward first gear is 2.5-5; the transmission ratio range of the forward second gear is 1.6273-4.3455; the transmission ratio range of the forward third gear is 1.4091-3.9091; the transmission ratio range of the forward fourth gear is 0.1515-3.6364; the transmission ratio of the forward fifth gear is 1; the transmission ratio range of the forward six gears is 0.2564-3.3333; the transmission ratio range of the forward seven gears is 0.2-0.4; the transmission ratio range of the forward eight gears is 0.0968-0.3077; the transmission ratio range of the reverse gear is-0.5-3.

The first brake and the second brake are both wet-type multi-disc brakes.

The first clutch, the second clutch, the third clutch and the fourth clutch are wet multi-plate clutches.

Advantageous effects

Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects: the invention adopts 1 standard Ravigneaux structure and 2 single planetary rows, and 2 clutches and 4 clutches arranged on the planetary rows, realizes 8 forward gears and 1 backward gear, realizes the requirement of multi-gear speed change by using less parts, and has simple structure, convenient manufacture and installation and small mechanism size.

Drawings

FIG. 1 is a schematic structural view of the present invention;

wherein, 1, an input shaft; 2. an output shaft; 3. a first planet row; 31. a first sun gear; 32. a first ring gear; 33. a first carrier; 34. a first planet gear; 4. a second planet row; 41. a second sun gear; 44. a second planet wheel; 5. a third planet row; 51. a third sun gear; 52. a second ring gear; 53. a second planet carrier 54, a third planet gear; 6. a fourth planet row; 61. a fourth sun gear; 62. a third ring gear; 63. a third carrier; 64. a fourth planet gear; 7. a first brake; 8. a second brake; 9. a first clutch; 10. a second clutch; 11. a third clutch; 12. and a fourth clutch.

Detailed Description

The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.

The embodiment of the invention relates to a transmission for a passenger car, which comprises an input shaft 1, a first planet row 3, a second planet row 4, a third planet row 5, a fourth planet row 6 and an output shaft 2, as shown in figure 1.

The first planetary row 3 comprises a first sun gear 31, a first gear ring 32, a first planet carrier 33 and a first planet gear 34, the first planet gear 34 is arranged on the first planet carrier 33 and is meshed with the first sun gear 31, the first gear ring 32 is externally provided with a first brake 7, and the input shaft 1 is fixedly connected with the first planet carrier 33.

The second planet row 4 comprises a second sun gear 41 and a second planet gear 44, the second sun gear 41 is meshed with the second planet gear 44, a first clutch 9 and a third clutch 11 are arranged outside the second sun gear, and the second planet gear 44 is arranged on the first planet carrier 33 and is respectively meshed with the first gear ring 32, the first planet gear 33 and the first gear ring 32.

In the present embodiment, the first planetary row 3 and the second planetary row 4 form a standard ravigneaux structure, which has fewer components, a more compact structure, and a smaller size than a common planetary row structure.

Third planet row 5 include third sun gear 51, second ring gear 52, second planet carrier 53 and third planet wheel 54, third sun gear 51 and first sun gear 31 fixed connection and with the meshing of third planet wheel 54, second ring gear 52 and the meshing of third planet wheel, the left and right sides is provided with first clutch 9, second clutch 10 respectively, wherein second sun gear 41 and second ring gear 52 are connected to first clutch 9, the second planet carrier left and right sides be provided with third clutch 11 and fourth clutch 12 respectively, wherein second sun gear 41 and second planet carrier 53 are connected to third clutch 11, the third planet wheel setting on second planet carrier 54.

The fourth planetary gear set 6 includes a fourth sun gear 61, a third ring gear 62, a third planet carrier 63 and a fourth planet gear 64, the fourth sun gear 61 is fixedly connected with the third sun gear 51, the fourth planet gear 64 is arranged on the third planet carrier 63, the third ring gear 62 is externally provided with a second brake 8, the third planet carrier 63 is provided with a second clutch 10 between the second ring gear 52, the third planet carrier 63 is provided with a fourth clutch 12 between the second planet carrier 53, and the output shaft 2 is fixedly connected with the third planet carrier 63.

Further, the first brake 7 and the second brake 8 are wet multi-disc brakes, and the first clutch 9, the second clutch 10, the third clutch 11, and the fourth clutch 12 are wet multi-disc clutches.

The specific working process is as follows:

when the second brake 8 is engaged, the third gear ring 62 is fixed, meanwhile, the first clutch 9 is engaged, the second sun gear 41 and the second gear ring 52 are connected into a whole, meanwhile, the third clutch 11 is engaged, the second sun gear 41 and the second planet carrier 53 are connected into a whole, and at the moment, the gearbox realizes a first forward gear, and the transmission ratio range of the first forward gear is 2.5-5.

When the second brake 8 is engaged, the third ring gear 62 is fixed, the second clutch 10 is engaged, the third planet carrier 63 and the second ring gear 52 are connected into a whole, the third clutch 11 is engaged, and the second sun gear 41 and the second planet carrier 53 are connected into a whole, so that the gearbox realizes the forward two gears, and the transmission ratio range of the forward two gears is 1.6273-4.3455.

When the second brake 8 is engaged to fix the third ring gear 62, the third clutch 11 is engaged to integrally connect the second sun gear 41 and the second planet carrier 53, and the fourth clutch 12 is engaged to integrally connect the third planet carrier 63 and the second planet carrier 53, the gearbox realizes the third forward gear, and the transmission ratio range of the third forward gear is 1.4091-3.9091.

When the second brake 8 is engaged to fix the third ring gear 62, the first clutch 9 is engaged, the second sun gear 41 and the second ring gear 52 are connected into a whole, the fourth clutch 12 is engaged, and the third planet carrier 63 and the second planet carrier 53 are connected into a whole, the gearbox realizes the fourth forward gear, and the transmission ratio range of the fourth forward gear is 0.1515-3.6364.

When the first clutch 9 is engaged, the second sun gear 41 and the second ring gear 52 are connected as a whole, the second clutch 10 is engaged, the third planet carrier 63 and the second ring gear 52 are connected as a whole, the fourth clutch 12 is engaged, and the third planet carrier 63 and the second planet carrier 53 are connected as a whole, the gearbox realizes the fifth forward gear, and the transmission ratio of the fifth forward gear is 1.

When the first brake 7 is engaged to fix the first ring gear 32, the first clutch 9 is engaged, the second sun gear 41 and the second ring gear 52 are connected into a whole, the fourth clutch 12 is engaged, and the third planet carrier 63 and the second planet carrier 53 are connected into a whole, the gearbox realizes six forward gears, and the transmission ratio range of the six forward gears is 0.2564-3.3333.

When the first brake 7 is engaged, the first gear ring 32 is fixed, meanwhile, the second clutch 10 is engaged, the third planet carrier 63 and the second gear ring 52 are connected into a whole, meanwhile, the fourth clutch 12 is engaged, the third planet carrier 63 and the second planet carrier 53 are connected into a whole, and at the moment, the gearbox realizes seven forward gears, and the transmission ratio range of the seven forward gears is 0.2-0.4.

When the first brake 7 is engaged to fix the first ring gear 32, the first clutch 9 is engaged, the second sun gear 41 and the second ring gear 52 are integrally connected, the second clutch 10 is engaged, and the third planet carrier 63 and the second ring gear 52 are integrally connected, the gearbox realizes eight forward gears, and the transmission ratio range of the eight forward gears is 0.0968-0.3077.

When the first brake 7 is engaged to fix the first ring gear 32, the second clutch 10 is engaged, the third carrier 63 and the second ring gear 52 are connected as a whole, the fourth clutch 12 is engaged, the third carrier 63 and the second carrier 53 are connected as a whole, and the transmission ratio of the reverse gear ranges from-0.5 to-3.

The embodiment provides one of the transmission planetary row parameters, which are shown in table 1.

Table 1 transmission planetary gear parameter table in the present embodiment

The gear ratios of the transmission according to the present embodiment are obtained by calculation, as shown in table 2.

Table 2 transmission ratio table for each gear of transmission in this embodiment

Gear position	Engaging brake and clutch	Transmission ratio
			Forward 1 gear	Second brake, first clutch, third clutch	4.3
Forward 2 gear	Second brake, third clutch	2.4614
			Forward 3 gear	Second brake, third clutch, fourth clutch	1.99
Forward 4 gear	Second brake, first clutch, fourth clutch	1.3977
			Forward 5 gear	First clutch, second clutch, fourth clutch	1
Advance 6-gear	First brake, first clutch, fourth clutch	0.6759
			Forward 7 gear	First brake, first clutch, second clutch	0.4
Forward 8 gear	First brake, second clutch, third clutch	0.2644
			Back gear	First brake, second clutch, fourth clutch	-2.5

According to the planet row parameters and the transmission ratio, the use and production requirements of the passenger car can be met.

As can be easily found, the invention adopts 1 standard Ravigneaux structure and 2 single planet rows, and 2 clutches and 4 clutches arranged on the planet rows, realizes 8 forward gears and 1 backward gear, realizes the requirement of multi-gear speed change by using less parts, and has simple structure, convenient manufacture and installation and small mechanism size.