CN105090394A - Nine-gear speed changer - Google Patents
Nine-gear speed changer Download PDFInfo
- Publication number
- CN105090394A CN105090394A CN201510424662.6A CN201510424662A CN105090394A CN 105090394 A CN105090394 A CN 105090394A CN 201510424662 A CN201510424662 A CN 201510424662A CN 105090394 A CN105090394 A CN 105090394A
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- Prior art keywords
- gear
- planet
- coupling member
- break
- gears
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
- F16H3/44—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion
- F16H3/62—Gearings having three or more central gears
- F16H3/66—Gearings having three or more central gears composed of a number of gear trains without drive passing from one train to another
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H2200/00—Transmissions for multiple ratios
- F16H2200/003—Transmissions for multiple ratios characterised by the number of forward speeds
- F16H2200/0065—Transmissions for multiple ratios characterised by the number of forward speeds the gear ratios comprising nine forward speeds
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H2200/00—Transmissions for multiple ratios
- F16H2200/20—Transmissions using gears with orbital motion
- F16H2200/2002—Transmissions using gears with orbital motion characterised by the number of sets of orbital gears
- F16H2200/2012—Transmissions using gears with orbital motion characterised by the number of sets of orbital gears with four sets of orbital gears
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structure Of Transmissions (AREA)
Abstract
The invention provides a nine-gear speed changer. The nine-gear speed changer mainly comprises an input shaft, an output shaft, planet gear rows, connecting members and torque transmission devices, which are all arranged in a speed changer housing, wherein each planet gear row comprises a sun gear, a planet carrier, a planet gear and a gear ring; the torque transmission devices include two clutches and four brakes; the two clutches and the four brakes are engaged selectively so as to rotate or fix the sun gears, the planet carriers, the gear rings or one of the five connecting members; the torque transmission devices can be engaged selectively in a combining form of at least two torque transmission devices so as to build the speed ratios of nine forward gears and the speed ratio of one reverse gear; and the nine forward gears include five deceleration gears, one direct gear and three overspeed gears. The speed changer provided by the invention is compact in structure, light in weight, small in size and easy to arrange on an automobile, and speed ratio steps between the transmission ratios of the gears of the speed changer meet the requirements of the speed changer.
Description
Technical field
The present invention relates to a kind of nine shift transmissions, belong to system of vehicle transmission technical field.
Background technique
Typical multi-speed transmission uses the combination of friction clutch, planetary gear system and fixed interconnection to realize multiple velocity ratio.The quantity of planetary gear set and physics are arranged usually by encapsulation, cost and desired speed ratio regulation.Although current speed changer achieves its expection object, universal along with automobile, people to new-type and improve speed changer configuration to need be in fact continual.
The improvement of described speed changer configuration is mainly set about from following two aspects, and one is performance, specifically comprises the angle of the scope of velocity ratio, responsiveness and flatness; Two is encapsulation, the size mainly reduced and weight, when gear is determined, the quantity realizing fixing component needed for gear is corresponding determines the performance therefore improvement of speed changer mainly being improved to speed changer, when speed changer composition component remains unchanged substantially, how to pass through the annexation improving each inter-module, to increase the attainable gear number of speed changer and velocity ratio parameter, become difficult point and the core of transmissions improved.Chinese invention application " eight shift transmissions " (application number: CN201410829472) and Chinese invention application " speed changer that CN201410826601-slewing range is wider " (application number: CN201110094929) all discloses a kind of eight shift transmissions be made up of four planetary gear train, six torque transmitters and four connector elements, above-mentioned two speed changers all realize eight forward gear speed ratios and the speed ratio that reverses gear, but there is the problem that speed is smaller, transmission stability is lower.
Summary of the invention
The object of the present invention is to provide a kind of volume that can reduce retarder, lower nine shift transmissions of the difficulty controlled and the ratio coverage expanding speed changer.
Realizing the technological scheme that the object of the invention adopts is that a kind of nine shift transmissions, comprise gearbox case and be installed on the input shaft of gearbox case inside, output shaft, epicyclic gear train group, coupling member group and torque transmitter, described epicyclic gear train group comprises the first planet gear row installed successively from front to back, second epicyclic gear train, third planet gear row and fourth planet gear row, each epicyclic gear train is by sun gear, planet carrier, planet wheel and gear ring are formed, and described torque transmitter comprises first clutch, second clutch, first break, second brake, 3rd break and the 4th break, each break is all connected with the housing of gearbox case, and described coupling member group comprises the first coupling member, second coupling member, 3rd coupling member, 4th coupling member and 5-linked connection member, wherein the first coupling member connects the planet carrier of first planet gear row and the sun gear of the second epicyclic gear train, second coupling member connects the gear ring of first planet gear row and the gear ring of the second epicyclic gear train, 3rd coupling member connects the sun gear that the planet carrier of the second epicyclic gear train and third planet gear are arranged, the planet carrier that the gear ring of the 4th coupling member connection third planet gear row and fourth planet gear are arranged, the gear ring that the planet carrier of 5-linked connection member connection third planet gear row and fourth planet gear are arranged,
Described first break is connected with the second coupling member, and second brake is connected with the 3rd coupling member, and the planet carrier that the 3rd break and first planet gear are arranged is connected, and the planet carrier that the 4th break and third planet gear are arranged is connected;
The sun gear that described input shaft and first planet gear are arranged is connected, the planet carrier that output shaft is arranged with fourth planet gear is connected, the sun gear that input shaft is arranged by first clutch and fourth planet gear is connected, and is connected with 5-linked connection member by second clutch.
As shown from the above technical solution, nine shift transmissions provided by the invention, realize speed changer nine forward gear speed ratios and the speed ratio that reverses gear by four epicyclic gear trains and six torque transmitters, the formation of the speed ratio of each gear obtains by engaging two torque transmitters; Wherein first clutch optionally engages to connect together with sun gear that input shaft and fourth planet gear arrange and rotates; Second clutch optionally engages to connect input shaft and rotates together with 5-linked connection member; First break optionally engages to connect the second coupling member and gearbox case, and object is to stop the second coupling member relative to the rotation of gearbox case; Second brake optionally engages to connect the 3rd coupling member and gearbox case, and object is to stop the 3rd coupling member relative to the rotation of gearbox case; 3rd break optionally engages the planet carrier and the gearbox case that connect first planet gear row, and planet carrier and first coupling member of first planet gear row interconnect, and object is to stop the first coupling member relative to the rotation of gearbox case; 4th break optionally engages the planet carrier and the gearbox case that connect third planet gear row, and planet carrier and the 5-linked connection member of third planet gear row interconnect, and object is to stop 5-linked connection member relative to the rotation of gearbox case.
Two clutches and four breaks optionally engage (rotation) or fixing moving link (some in sun gear, planet carrier, gear ring or five coupling members), and wherein torque transmitter optionally can engage can set up nine forward gear speed ratios and the speed ratio that reverses gear between described input shaft and output shaft with the combining form of at least two, nine forward gears comprise five gears that slow down, a direct gear and three overgears, are specially:
1) the first break and the 4th break engage, and realize the foundation of reversing gear, the velocity ratio reversed gear is-7.5;
2) the 3rd break and the 4th break engage, and realize the foundation of a gear (slow down gear), the velocity ratio of a gear is 5;
3) first clutch and the 4th break engage, and realize the foundation of two gears (slow down gear), the velocity ratio of two gears is 3, and speed ratio step is 1.67;
4) first clutch and the 3rd break engage, and realize the foundation of three gears (slow down gear), the velocity ratio of three gears is 2.27, and speed ratio step is 1.32.
5) first clutch and second brake engage, and realize the foundation of four gears (slow down gear), the velocity ratio of four gears is 1.67, and speed ratio step is 1.36;
6) first clutch and the first break engage, and realize the foundation of five gears (slow down gear), the velocity ratio of five gears is 1.51, and speed ratio step is 1.11;
7) first clutch and second clutch engage, and realize the foundation of six gears (directly keeping off), and the velocity ratio of six gears is 1, and speed ratio step is 1.51;
8) second clutch and the first break engage, and realize the foundation of seven gears (overgear), and the velocity ratio of seven gears is 0.7, and speed ratio step is 1.43;
9) second clutch and second brake engage, and realize the foundation of eight gears (overgear), and the velocity ratio of eight gears is 0.67, and speed ratio step is 1.04;
10) second clutch and the 3rd break engage, and realize the foundation of nine gears (overgear), and the velocity ratio of nine gears is 0.59, and speed ratio step is 1.14.
Compared with prior art, beneficial effect of the present invention is:
1, nine shift transmissions provided by the invention adopt Gear Planet Transmission, and gear concentrates on centre, and its power can carry out transmission by several planet wheel, and the modulus of gear is little, compact structure, and lighter in weight is easily arranged on automobile;
2, decrease the number of torque-transfer members, nine shift transmissions only use only six torque-transfer members, reduce the volume of speed changer to a great extent;
3, the control of each gear only needs two basic change component (clutch or break), controls simple;
4, this speed changer utilizes coupling member to be linked together by the component of different gear train, can form new transmission mechanism, and the quantity of coupling member and the difference of position will cause the transmission mechanism difference in essence formed.This speed changer utilizes four coupling members, connecting mode empirical tests is feasible, and make the gear range of this speed changer wider by the special parameter preferably obtained, the total slewing range of each gear can reach 8.52, than the slewing range 7.37 of the ZF8 speed transmission of classics and the slewing range 6.71 of Lexus LS460 speed changer wider;
5, the speed ratio step of three overgears is all less, is respectively 1.43,1.04 and 1.14, can steadily transmission, improves the power performance of automobile.
Accompanying drawing explanation
Fig. 1 is the structure diagram of nine shift transmissions provided by the invention.
Wherein, 1-input shaft, 2-output shaft, 3-gearbox case, 4-5-linked connection member, 5-first coupling member, 6-second coupling member, 7-the 3rd coupling member, 8-the 4th coupling member, 11-first planet gear toothrow circle, 12-first planet gear seniority among brothers and sisters star-wheel, 13-first planet gear seniority among brothers and sisters carrier, 14-first planet gear row sun gear, 21-second epicyclic gear train gear ring, 22-second epicyclic gear train planet wheel, 23-second epicyclic gear train planet carrier, 24-second epicyclic gear train sun gear, 31-third planet gear toothrow circle, 32-third planet gear seniority among brothers and sisters star-wheel, 33-third planet gear seniority among brothers and sisters carrier, 34-third planet gear row sun gear, 41-fourth planet gear toothrow circle, 42-fourth planet gear seniority among brothers and sisters star-wheel, 43-fourth planet gear seniority among brothers and sisters carrier, 44-fourth planet gear row sun gear, C1-first clutch, C2-second clutch, B1-first break, B2-second brake, B3-the 3rd break, B4-the 4th break.
Embodiment
Illustrate in detail the present invention below in conjunction with drawings and Examples, content of the present invention is not limited to following examples.
Nine shift transmissions provided by the invention, its structure as shown in Figure 1, comprise gearbox case 3 and be installed on the input shaft 1 of gearbox case inside, output shaft 2, epicyclic gear train group, coupling member group and torque transmitter, described epicyclic gear train group comprises the first planet gear row installed successively from front to back, second epicyclic gear train, third planet gear row and fourth planet gear row, each epicyclic gear train is by sun gear (14, 24, 34 and 44), planet carrier (13, 23, 33 and 43), planet wheel (13, 23, 33 and 43) and gear ring (12, 22, 32 and 42) form, planet wheel wherein in epicyclic gear train and sun gear and gear ring are all intermeshed by gear pair, described torque transmitter comprises first clutch C1, second clutch C2, first break B1, second brake B2, 3rd break B3 and the 4th break B4, each break is all connected with the housing 3 of gearbox case,
Described coupling member group comprises the first coupling member 5, second coupling member 6, the 3rd coupling member 7, the 4th coupling member 8 and 5-linked connection member 4, and wherein first planet gear seniority among brothers and sisters carrier 13 and the second epicyclic gear train sun gear 124 interconnect by the first coupling member 5; First planet gear toothrow circle 11 and the second epicyclic gear train gear ring 21 interconnect by the second coupling member 6; Second epicyclic gear train planet carrier 23 and third planet gear row sun gear 34 interconnect by the 3rd coupling member 7; Third planet gear toothrow circle 31 and fourth planet gear seniority among brothers and sisters star-wheel 43 interconnect by the 4th coupling member 8; Third planet gear seniority among brothers and sisters carrier 33 and fourth planet gear toothrow circle 41 interconnect by 5-linked connection member 4;
Described torque transmitter comprises first clutch C1, second clutch C2, the first break B1, second brake B2, the 3rd break B3 and the 4th break B4, and wherein input shaft 1 and fourth planet gear row sun gear 44 interconnect by first clutch C1; Input shaft 1 and 5-linked connection member 4 interconnect by second clutch C2; Second coupling member and case of transmission 3 interconnect by the first break B1; 3rd coupling member 7 interconnects with case of transmission 3 by second brake B2; First coupling member 5 and case of transmission 3 interconnect by the 3rd break B3; 5-linked connection member 4 and case of transmission 3 interconnect by the 4th break B4;
The output terminal of described input shaft 1 is arranged sun gear 14 with first planet gear all the time and is connected, the input end of input shaft 1 is connected to the turbine of motor or torque-converters all the time, the input end of output shaft 2 is ranked carrier 43 with fourth planet gear all the time and is connected, and the output terminal of output shaft 2 is connected to next stage retarder.
Below the variable block principle of nine shift transmissions provided by the invention is introduced, this speed changer can realize nine forward gear speed ratios and the speed ratio that reverses gear, the formation of the speed ratio of each gear obtains by engaging two torque transmitters, introduces the working procedure of each gear below in detail:
The foundation of reversing gear, the first break B1 and the 4th break B4 engages.Specifically, the first break B1 is engaged to make the second coupling member 6 be connected with case of transmission 3, prevents the second coupling member 6 relative to the rotation of case of transmission 3.4th break B4 is engaged to make 5-linked connection member 4 be connected with case of transmission 3, prevents 5-linked connection member 4 relative to the rotation of case of transmission 3.Thus, between input shaft 1 and output shaft 2, set up the velocity ratio reversed gear.
The foundation of one gear (slow down gear), the 3rd break B3 and the 4th break B4 is engaged.Specifically, the 3rd break B3 is engaged to connect the first coupling member 5 and case of transmission 3, prevents the first coupling member 5 relative to the rotation of case of transmission 3.4th break B4 is engaged to make 5-linked connection member 4 be connected with case of transmission 3, prevents 5-linked connection member 4 relative to the rotation of case of transmission 3.Thus, between input shaft 1 and output shaft 2, establish the velocity ratio of a gear.
The foundation of two gears (slow down gear), first clutch C1 and the 4th break B4 is engaged.Specifically, first clutch C1 is engaged rotates together with sun gear 44 to connect sun gear 14.4th break B4 is engaged to make 5-linked connection member 4 be connected with case of transmission 3, prevents 5-linked connection member 4 relative to the rotation of case of transmission 3.Result in formation of single planetary gear row transmission, between input shaft 1 and output shaft 2, establish the velocity ratio of two gears thus.
The foundation of three gears (slow down gear), first clutch C1 and the 3rd break B3 is engaged.Specifically, first clutch C1 is engaged rotates together with sun gear 44 to connect sun gear 14.First break B1 is engaged to make the second coupling member 6 be connected with case of transmission 3, prevents the second coupling member 6 relative to the rotation of case of transmission 3.Thus, between input shaft 1 and output shaft 2, establish the velocity ratio of three gears.
The foundation of four gears (slow down gear), first clutch C1 and second brake B2 is engaged.Specifically, first clutch C1 is engaged rotates together with sun gear 44 to connect sun gear 14.Second brake B2 is engaged to make the 3rd coupling member 7 be connected with case of transmission 3, prevents the 3rd coupling member 7 relative to the rotation of case of transmission 3.Thus, between input shaft 1 and output shaft 2, establish the velocity ratio of four gears.
The foundation of five gears (slow down gear), first clutch C1 and the first break B1 is engaged.Specifically, first clutch C1 is engaged rotates together with sun gear 44 to connect sun gear 14.First break B1 is engaged to make the second coupling member 6 be connected with case of transmission 3, prevents the second coupling member 6 relative to the rotation of case of transmission 3.Thus, between input shaft 1 and output shaft 2, establish the velocity ratio of five gears.
The foundation of six gears (directly keeping off), first clutch C1 and second clutch C2 is engaged.Specifically, first clutch C1 is engaged rotates together with fourth planet gear row sun gear 44 to connect first planet gear row sun gear 14.Second clutch C2 is engaged to be rotated together with 5-linked connection member 4 to connect sun gear 14.Thus, between input shaft 1 and output shaft 2, establish the velocity ratio of six gears.
The foundation of seven gears (overgear), second clutch C2 and the first break B1 is engaged.Specifically, second clutch C2 is engaged rotates together with 5-linked connection member 4 to connect sun gear 14.First break B1 is engaged to make the second coupling member 6 be connected with case of transmission 3, prevents the second coupling member 6 relative to the rotation of case of transmission 3.Thus, between input shaft 1 and output shaft 2, set up the velocity ratio of seven gears.
The foundation of eight gears (overgear), second clutch C2 and second brake B2 is engaged.Specifically, second clutch C2 is engaged rotates together with 5-linked connection member 4 to connect sun gear 14.Second brake B2 is engaged to make the 3rd coupling member 7 be connected with case of transmission 3, prevents the 3rd coupling member 7 relative to the rotation of case of transmission 3.Thus, between input shaft 1 and output shaft 2, set up the velocity ratio of eight gears.
The foundation of nine gears (overgear), second clutch C2 and the 3rd break B3 is engaged.Specifically, second clutch C2 is engaged rotates together with 5-linked connection member 4 to connect sun gear 14.3rd break B3 is engaged to make the first coupling member 5 be connected with case of transmission 3, prevents the first coupling member 5 relative to the rotation of case of transmission 3.Thus, between input shaft 1 and output shaft 2, set up the velocity ratio of nine gears.
The velocity ratio of each gear, speed ratio step and each gear torque transmitter jointing state are as shown in the table:
In table: X represents joint and transmitting torque, O represents and engages but not transmitting torque.
Claims (1)
1. nine shift transmissions, comprise gearbox case and are installed on the input shaft of gearbox case inside, output shaft, epicyclic gear train group, coupling member group and torque transmitter, described epicyclic gear train group comprises the first planet gear row installed successively from front to back, second epicyclic gear train, third planet gear row and fourth planet gear row, each epicyclic gear train is by sun gear, planet carrier, planet wheel and gear ring are formed, and described torque transmitter comprises first clutch, second clutch, first break, second brake, 3rd break and the 4th break, each break is all connected with the housing of gearbox case, it is characterized in that: described coupling member group comprises the first coupling member, second coupling member, 3rd coupling member, 4th coupling member and 5-linked connection member, wherein the first coupling member connects the planet carrier of first planet gear row and the sun gear of the second epicyclic gear train, second coupling member connects the gear ring of first planet gear row and the gear ring of the second epicyclic gear train, 3rd coupling member connects the sun gear that the planet carrier of the second epicyclic gear train and third planet gear are arranged, the planet carrier that the gear ring of the 4th coupling member connection third planet gear row and fourth planet gear are arranged, the gear ring that the planet carrier of 5-linked connection member connection third planet gear row and fourth planet gear are arranged,
Described first break is connected with the second coupling member, and second brake is connected with the 3rd coupling member, and the planet carrier that the 3rd break and first planet gear are arranged is connected, and the planet carrier that the 4th break and third planet gear are arranged is connected;
The sun gear that described input shaft and first planet gear are arranged is connected, the planet carrier that output shaft is arranged with fourth planet gear is connected, the sun gear that input shaft is arranged by first clutch and fourth planet gear is connected, and is connected with 5-linked connection member by second clutch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510424662.6A CN105090394B (en) | 2015-07-17 | 2015-07-17 | A kind of nine speed transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510424662.6A CN105090394B (en) | 2015-07-17 | 2015-07-17 | A kind of nine speed transmission |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105090394A true CN105090394A (en) | 2015-11-25 |
| CN105090394B CN105090394B (en) | 2018-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510424662.6A Expired - Fee Related CN105090394B (en) | 2015-07-17 | 2015-07-17 | A kind of nine speed transmission |
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| Country | Link |
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| CN (1) | CN105090394B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106812880A (en) * | 2015-12-02 | 2017-06-09 | 现代自动车株式会社 | For the epicyclic train of the automatic transmission of vehicle |
| CN106812891A (en) * | 2015-12-02 | 2017-06-09 | 现代自动车株式会社 | For the epicyclic train of the automatic transmission of vehicle |
| CN109764095A (en) * | 2019-02-25 | 2019-05-17 | 燕山大学 | Nine speed transmission |
| CN109798334A (en) * | 2019-02-25 | 2019-05-24 | 燕山大学 | A kind of nine speed transmission |
| CN112324874A (en) * | 2020-11-30 | 2021-02-05 | 中国地质大学（武汉） | Nine-gear automatic transmission with stable step ratio |
| CN112324876A (en) * | 2020-11-19 | 2021-02-05 | 中国地质大学（武汉） | Nine-gear automatic transmission with large speed ratio range |
| CN112324875A (en) * | 2020-11-19 | 2021-02-05 | 中国地质大学（武汉） | Nine-gear automatic transmission with small step ratio |
| CN112324877A (en) * | 2020-11-19 | 2021-02-05 | 中国地质大学（武汉） | Nine-gear automatic transmission |
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| EP0239205A2 (en) * | 1986-02-27 | 1987-09-30 | General Motors Corporation | Transmission gearing arrangement |
| CN101344147A (en) * | 2007-07-13 | 2009-01-14 | 通用汽车环球科技运作公司 | Multi-speed transmission |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106812880A (en) * | 2015-12-02 | 2017-06-09 | 现代自动车株式会社 | For the epicyclic train of the automatic transmission of vehicle |
| CN106812891A (en) * | 2015-12-02 | 2017-06-09 | 现代自动车株式会社 | For the epicyclic train of the automatic transmission of vehicle |
| CN106812891B (en) * | 2015-12-02 | 2020-12-04 | 现代自动车株式会社 | Planetary gear train of automatic transmission for vehicle |
| CN109764095A (en) * | 2019-02-25 | 2019-05-17 | 燕山大学 | Nine speed transmission |
| CN109798334A (en) * | 2019-02-25 | 2019-05-24 | 燕山大学 | A kind of nine speed transmission |
| CN109764095B (en) * | 2019-02-25 | 2022-02-18 | 燕山大学 | Nine-gear transmission |
| CN112324876A (en) * | 2020-11-19 | 2021-02-05 | 中国地质大学（武汉） | Nine-gear automatic transmission with large speed ratio range |
| CN112324875A (en) * | 2020-11-19 | 2021-02-05 | 中国地质大学（武汉） | Nine-gear automatic transmission with small step ratio |
| CN112324877A (en) * | 2020-11-19 | 2021-02-05 | 中国地质大学（武汉） | Nine-gear automatic transmission |
| CN112324877B (en) * | 2020-11-19 | 2023-04-18 | 中国地质大学（武汉） | Nine-gear automatic transmission |
| CN112324875B (en) * | 2020-11-19 | 2023-04-18 | 中国地质大学（武汉） | Nine-gear automatic transmission with small step ratio |
| CN112324874A (en) * | 2020-11-30 | 2021-02-05 | 中国地质大学（武汉） | Nine-gear automatic transmission with stable step ratio |
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| CN105090394B (en) | 2018-04-10 |
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