A hydraulic mechanical continuously variable transmission with modular combination distribution of two-state logic variable units

Abstract

The application discloses a hydraulic mechanical continuously variable transmission with modular combination distribution of two-state logic variable units, and relates to the field of heavy-duty high-horsepower vehicle transmission. n The number of BLTU is 2n (n is the number of BLTU), the configuration scheme is flexible, and transmission efficiency is high; the power output ends of the nested double-row planetary gear mechanism are the outermost gear ring of the first planetary row and the planetary carrier of the second planetary row, the nested clutch is used to combine the double output ends, the hydraulic transmission device, the power bus device and the modular device are located on the same axis, the structure is compact, and speed matching of the section is facilitated; the section switching is realized through the cooperation of the nested clutch and the BLTU, power interruption is avoided, and section changing quality is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a composite transmission structure for heavy-duty, high-horsepower vehicles, in particular to a dual-state logic variable unit modular combination distributed hydro-mechanical continuously variable transmission. BACKGROUND

[0002] At present, the mechanical transmission variable speed device and the hydraulic transmission variable speed device circulating in the market are difficult to meet the requirements of heavy-duty, high-horsepower vehicles such as engineering vehicles, agricultural vehicles and military vehicles for load capacity and variable speed ratio range, thereby causing problems such as inability to realize infinitely variable speed, difficulty in bearing high-strength load, low fuel efficiency, low transmission efficiency and the like.

[0003] Hydro-mechanical composite transmission couples hydraulic transmission and mechanical transmission, combines the characteristics of hydraulic transmission infinitely variable speed and bearing large load with the characteristics of high transmission efficiency of mechanical transmission, and can significantly improve the power performance and economy of heavy-duty, high-horsepower vehicles. The classic HMCVT (hydro-mechanical continuously variable transmission) divides the power of the engine through a gear pair, supplies part of the power to the hydraulic transmission system, and then converges the power through a converging mechanism. The classic converging mechanism is a planetary gear converging mechanism composed of two planetary gears. The power converging is completed by a single planetary gear, and the converging direction and segment position are determined by the separation and combination of the clutch. Different segment positions often require different clutches to cooperate, thereby resulting in a large number of required countershafts, complex overall mechanism, large layout space, poor coaxiality of main transmission components, high mechatronics integration level, and difficulty in conveniently changing the layout of the system to realize the increase or decrease of segment positions and the change of transmission ratio range according to different use conditions.

[0004] Therefore, how to reduce the complexity and layout space of the HMCVT system and realize modular design and convenient system design method is a problem to be solved in the field. SUMMARY

[0005] The purpose of the present application is to provide a dual-state logic variable unit modular combination distributed hydro-mechanical continuously variable transmission with flexible configuration scheme, multiple segment positions, and modular and combination design.

[0006] Technical scheme: The dual-state logic variable unit modular combination distributed hydro-mechanical continuously variable transmission provided by the present application comprises an input shaft, a hydraulic transmission assembly, a nested double-row planetary gear mechanism, a nested clutch, a first dual-state logic variable unit and an output shaft.

[0007] The hydraulic transmission assembly comprises a variable pump, a fixed displacement motor and a first transmission shaft, the input shaft is connected with the variable pump through a pair of front gears, and the fixed displacement motor is fixedly connected to the first transmission shaft;

[0008] The nested double-row planetary gear mechanism comprises a first planetary row and a second planetary row, and the first planetary row and the second planetary row are both single-stage planetary rows with three planetary gears, wherein the first planetary row comprises a first planetary row central wheel, a first planetary row carrier and a first planetary row gear ring, the second planetary row comprises a second planetary row carrier and a second planetary row central wheel, the first planetary row carrier serves as the second planetary row gear ring, and the first planetary row central wheel and the second planetary row central wheel are fixedly connected to the first transmission shaft; the input shaft transmits power to the first planetary row carrier through a first gear pair;

[0009] The first double-state logic shifting unit comprises a third planetary row, a second brake, a second transmission shaft and a second clutch, the third planetary row is a double-stage planetary row with six planetary gears, comprising a third planetary row gear ring, a third planetary row carrier and a third planetary row central wheel, the third planetary row central wheel is fixedly connected to the second transmission shaft, and the third planetary row carrier transmits power to the output shaft; the second brake is used for braking the third planetary row gear ring, and the second clutch is used for connecting the third planetary row gear ring and the third planetary row central wheel.

[0010] The nested clutch comprises a nested clutch first part and a nested clutch second part, wherein the nested clutch first part is used for connecting the first planetary row gear ring and the second transmission shaft, and the nested clutch second part is used for connecting the second planetary row carrier and the second transmission shaft.

[0011] Further, the modularly combined and distributed hydraulic mechanical continuously variable transmission of the double-state logic shifting unit further comprises a first brake and a first clutch, the first brake is used for braking the first planetary row carrier, and the first clutch is used for connecting the input shaft and the first gear pair.

[0012] Further, the first brake and the second brake are both wet multi-plate brakes, and the first clutch, the second clutch, the nested clutch first part and the nested clutch second part are all wet multi-plate clutches.

[0013] Further, when the first brake is engaged, the first clutch is disengaged, the second brake is engaged, the second clutch is disengaged, the nested clutch first part is engaged and the nested clutch second part is disengaged, the automatic transmission is in a first forward section of a forward gear.

[0014] When the first brake is disengaged, the first clutch is engaged, the second brake is engaged, the second clutch is disengaged, the nested clutch first part is disengaged and the nested clutch second part is engaged, the automatic transmission is in a second forward section of the forward gear.

[0015] When the first brake is disengaged, the first clutch is engaged, the second brake is engaged, the second clutch is disengaged, the nested clutch first part is engaged, and the nested clutch second part is disengaged, the automatic transmission is in the forward first gear of the forward gear;

[0016] When the first brake is engaged, the first clutch is disengaged, the second brake is disengaged, the second clutch is engaged, the nested clutch first part is engaged, and the nested clutch second part is disengaged, the automatic transmission is in the reverse first gear of the forward gear;

[0017] When the first brake is disengaged, the first clutch is engaged, the second brake is disengaged, the second clutch is engaged, the nested clutch first part is disengaged, and the nested clutch second part is engaged, the automatic transmission is in the reverse second gear of the forward gear.

[0018] When the first brake is disengaged, the first clutch is engaged, the second brake is disengaged, the second clutch is engaged, the nested clutch first part is engaged, and the nested clutch second part is disengaged, the automatic transmission is in the reverse third gear of the forward gear.

[0019] Further, the modularly combined and distributed hydraulic mechanical continuously variable transmission of the dual-state logic gear shifting unit further comprises a first brake and a second dual-state logic gear shifting unit, the second dual-state logic gear shifting unit being arranged between the input shaft and the first gear pair, and comprising a fourth planetary gear set, a third transmission shaft, a third clutch, and a third brake, the fourth planetary gear set being a single-stage planetary gear set with three planetary gears, comprising a fourth planetary gear set ring gear, a fourth planetary gear set carrier, and a fourth planetary gear set sun gear, the fourth planetary gear set carrier being fixedly connected to the third transmission shaft, and the fourth planetary gear set sun gear being fixedly connected to the input shaft; the third transmission shaft being in transmission connection with the first planetary gear set carrier through the first gear pair; the first brake being used for braking the first planetary gear set carrier; the third brake being used for braking the fourth planetary gear set ring gear; and the third clutch being used for connecting the fourth planetary gear set ring gear and the fourth planetary gear set sun gear.

[0020] Further, the first brake, the second brake, and the third brake are all wet multi-plate brakes; the second clutch, the third clutch, the nested clutch first part, and the nested clutch second part are all wet multi-plate clutches.

[0021] Further, when the first brake is engaged, the second brake is engaged, the second clutch is disengaged, the third brake is disengaged, the third clutch is disengaged, the nested clutch first part is engaged, and the nested clutch second part is disengaged, the automatic transmission is in the forward first gear of the forward gear.

[0022] When the first brake is disengaged, the second brake is engaged, the second clutch is disengaged, the third brake is engaged, the third clutch is disengaged, the nested clutch first part is disengaged, and the nested clutch second part is engaged, the automatic transmission is in the second forward stage of the forward gear;

[0023] When the first brake is disengaged, the second brake is engaged, the second clutch is disengaged, the third brake is engaged, the third clutch is disengaged, the nested clutch first part is engaged, and the nested clutch second part is disengaged, the automatic transmission is in the third forward stage of the forward gear;

[0024] When the first brake is disengaged, the second brake is engaged, the second clutch is disengaged, the third brake is disengaged, the third clutch is engaged, the nested clutch first part is disengaged, and the nested clutch second part is engaged, the automatic transmission is in the fourth forward stage of the forward gear;

[0025] When the first brake is disengaged, the second brake is engaged, the second clutch is disengaged, the third brake is disengaged, the third clutch is engaged, the nested clutch first part is engaged, and the nested clutch second part is disengaged, the automatic transmission is in the fifth forward stage of the forward gear;

[0026] When the first brake is engaged, the second brake is disengaged, the second clutch is engaged, the third brake is disengaged, the third clutch is disengaged, the nested clutch first part is engaged, and the nested clutch second part is disengaged, the automatic transmission is in the first reverse stage of the forward gear;

[0027] When the first brake is disengaged, the second brake is disengaged, the second clutch is engaged, the third brake is engaged, the third clutch is disengaged, the nested clutch first part is disengaged, and the nested clutch second part is engaged, the automatic transmission is in the second reverse stage of the forward gear;

[0028] When the first brake is disengaged, the second brake is disengaged, the second clutch is engaged, the third brake is engaged, the third clutch is disengaged, the nested clutch first part is engaged, and the nested clutch second part is disengaged, the automatic transmission is in the third reverse stage of the forward gear;

[0029] When the first brake is disengaged, the second brake is disengaged, the second clutch is engaged, the third brake is disengaged, the third clutch is engaged, the nested clutch first part is engaged, and the nested clutch second part is disengaged, the automatic transmission is in the fourth reverse stage of the forward gear;

[0030] When the first brake is disengaged, the second brake is disengaged, the second clutch is engaged, the third brake is disengaged, the third clutch is engaged, the nested clutch first part is engaged, and the nested clutch second part is disengaged, the automatic transmission is in the fifth reverse stage of the forward gear.

[0031] Further, the hydraulic mechanical continuously variable transmission with modular combination distribution of the two-state logic variable unit further comprises a second two-state logic variable unit, which is arranged between the first two-state logic variable unit and the output shaft, and comprises a fourth planetary gear, a third transmission shaft, a third clutch and a third brake, the fourth planetary gear is a single-stage planetary gear with three planetary gears, comprising a fourth planetary gear ring, a fourth planetary gear carrier and a fourth planetary gear center wheel, the fourth planetary gear carrier is fixedly connected to the output shaft, and the fourth planetary gear center wheel is fixedly connected to the third transmission shaft; the third brake is used for braking the fourth planetary gear ring, and the third clutch is used for connecting the fourth planetary gear ring and the fourth planetary gear center wheel; and the third planetary gear carrier is fixedly connected to the third transmission shaft.

[0032] Further, the second brake and the third brake are both wet multi-plate brakes; the second clutch, the third clutch, the first part of the nested clutch and the second part of the nested clutch are all wet multi-plate clutches.

[0033] Further, when the second brake is engaged, the second clutch is disengaged, the third brake is engaged, the third clutch is disengaged, the first part of the nested clutch is disengaged and the second part of the nested clutch is engaged, the automatic transmission is in the first forward section of the forward gear.

[0034] When the second brake is engaged, the second clutch is disengaged, the third brake is engaged, the third clutch is disengaged, the first part of the nested clutch is engaged and the second part of the nested clutch is disengaged, the automatic transmission is in the second forward section of the forward gear.

[0035] When the second brake is engaged, the second clutch is disengaged, the third brake is disengaged, the third clutch is engaged, the first part of the nested clutch is disengaged and the second part of the nested clutch is engaged, the automatic transmission is in the third forward section of the forward gear.

[0036] When the second brake is engaged, the second clutch is disengaged, the third brake is disengaged, the third clutch is engaged, the first part of the nested clutch is engaged and the second part of the nested clutch is disengaged, the automatic transmission is in the fourth forward section of the forward gear.

[0037] When the second brake is disengaged, the second clutch is engaged, the third brake is engaged, the third clutch is disengaged, the first part of the nested clutch is disengaged and the second part of the nested clutch is engaged, the automatic transmission is in the first reverse section of the forward gear.

[0038] When the second brake is disengaged, the second clutch is engaged, the third brake is engaged, the third clutch is disengaged, the first part of the nested clutch is engaged and the second part of the nested clutch is disengaged, the automatic transmission is in the second reverse section of the forward gear.

[0039] The automatic transmission is in the reverse third gear of the forward gear when the second brake is separated, the second clutch is combined, the third brake is separated, the third clutch is combined, the nested clutch first part is separated, and the nested clutch second part is combined.

[0040] The automatic transmission is in the reverse fourth gear of the forward gear when the second brake is separated, the second clutch is combined, the third brake is separated, the third clutch is combined, the nested clutch first part is combined, and the nested clutch second part is separated.

[0041] Beneficial effects: Compared with the prior art, the present application has the following remarkable advantages: The present application can realize modularization and combined design, and realize stepless speed change in a large transmission ratio range. By adjusting the number and arrangement position of the dual-state logic speed change units, the change of different transmission ratios can be realized, and the present application has the advantages of simple structure and realization of a large number of gear positions. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 is a schematic diagram of the hydraulic mechanical stepless speed change unit of the modularization and combined distribution of the dual-state logic speed change unit in the embodiment of the present application;

[0043] Figure 2 is a layout schematic diagram of the hydraulic mechanical stepless speed change unit of the modularization and combined distribution of the dual-state logic speed change unit provided in Embodiment 1 of the present application;

[0044] Figure 3 is a layout schematic diagram of the hydraulic mechanical stepless speed change unit of the modularization and combined distribution of the dual-state logic speed change unit provided in Embodiment 2 of the present application;

[0045] Figure 4 is a layout schematic diagram of the hydraulic mechanical stepless speed change unit of the modularization and combined distribution of the dual-state logic speed change unit provided in Embodiment 3 of the present application;

[0046] Figure 5 is a transmission ratio change graph with displacement ratio in Embodiment 1 of the present application, wherein Figure 5 (a) is a forward gear displacement ratio change graph, Figure 5 (b) is a reverse gear displacement ratio change graph;

[0047] Figure 6 is a transmission ratio change graph with displacement ratio in Embodiment 2 of the present application, wherein Figure 6 (a) is a forward gear displacement ratio change graph, Figure 6 (b) is a reverse gear displacement ratio change graph;

[0048] Figure 7 is a transmission ratio change graph with displacement ratio in Embodiment 3 of the present application, wherein Figure 7(a) is a forward range displacement ratio change map, Figure 7 (b) is a reverse range displacement ratio change map;

[0049] Figure 8 is a power flow direction map for the forward range 1 of the embodiment 1 of the present application;

[0050] Figure 9 is a power flow direction map for the forward range 2 of the embodiment 1 of the present application;

[0051] Figure 10 is a power flow direction map for the forward range 3 of the embodiment 1 of the present application;

[0052] Figure 11 is a power flow direction map for the reverse range 1 of the embodiment 1 of the present application;

[0053] Figure 12 is a power flow direction map for the reverse range 2 of the embodiment 1 of the present application;

[0054] Figure 13 is a power flow direction map for the reverse range 3 of the embodiment 1 of the present application;

[0055] Figure 14 is a power flow direction map for the forward range 1 of the embodiment 2 of the present application;

[0056] Figure 15 is a power flow direction map for the forward range 2 of the embodiment 2 of the present application;

[0057] Figure 16 is a power flow direction map for the forward range 3 of the embodiment 2 of the present application;

[0058] Figure 17 is a power flow direction map for the forward range 4 of the embodiment 2 of the present application;

[0059] Figure 18 is a power flow direction map for the forward range 5 of the embodiment 2 of the present application;

[0060] Figure 19 is a power flow direction map for the reverse range 1 of the embodiment 2 of the present application;

[0061] Figure 20 is a power flow direction map for the reverse range 2 of the embodiment 2 of the present application;

[0062] Figure 21 is a power flow direction map for the reverse range 3 of the embodiment 2 of the present application;

[0063] Figure 22 is a power flow direction map for the reverse range 4 of the embodiment 2 of the present application;

[0064] Figure 23 is a power flow direction map for the reverse range 5 of the embodiment 2 of the present application;

[0065] Figure 24 is a power flow direction diagram of the forward stage one in the embodiment 3 of the present application;

[0066] Figure 25 is a power flow direction diagram of the forward stage two in the embodiment 3 of the present application;

[0067] Figure 26 is a power flow direction diagram of the forward stage three in the embodiment 3 of the present application;

[0068] Figure 27 is a power flow direction diagram of the forward stage four in the embodiment 3 of the present application;

[0069] Figure 28 is a power flow direction diagram of the backward stage one in the embodiment 3 of the present application;

[0070] Figure 29 is a power flow direction diagram of the backward stage two in the embodiment 3 of the present application;

[0071] Figure 30 is a power flow direction diagram of the backward stage three in the embodiment 3 of the present application;

[0072] Figure 31 is a power flow direction diagram of the backward stage four in the embodiment 3 of the present application. DETAILED DESCRIPTION

[0073] The application will be further described below with reference to the drawings.

[0074] The accompanying drawings are included to provide a further understanding of the application. Figures 1 to 31 The reference signs in the drawings are as follows:

[0075] 1, input shaft; 2, pump front gear pair; 3, variable pump; 4, fixed displacement motor; 5, first transmission shaft; 6, first planetary gear set sun gear; 7, first planetary gear set carrier; 8, first planetary gear set ring gear; 9, second brake; 10, third planetary gear set ring gear; 11, third planetary gear set carrier; 12, third planetary gear set sun gear; 13, output shaft; 14, second transmission shaft; 15, second clutch; 16, nested clutch second part; 17, nested clutch first part; 18, second planetary gear set carrier; 19, second planetary gear set sun gear; 20, first brake; 21, third transmission shaft; 22, first gear pair; 23, fourth planetary gear set ring gear; 24, fourth planetary gear set carrier; 25, fourth planetary gear set sun gear; 26, third clutch; 27, third brake; 28, first clutch.

[0076] Embodiment 1

[0077] As Figure 2As shown, a kind of dual-state logic variable unit modular combination distribution of hydraulic mechanical continuously variable transmission, including input shaft 1, hydraulic transmission assembly, nested double planetary gear mechanism, nested clutch, first dual-state logic variable unit, output shaft 13, first brake 20 and first clutch 28;

[0078] Hydraulic transmission assembly includes variable pump 3, fixed displacement motor 4 and first transmission shaft 5, input shaft 1 is connected with variable pump 3 by pump front gear pair 2 (variable pump 3 is fixedly connected to pump front gear pair 2), and fixed displacement motor 4 is fixedly connected to first transmission shaft 5;

[0079] Nested double planetary gear mechanism includes first planetary row and second planetary row, and the first and second planetary row are single-stage planetary row of three planetary gears, wherein the first planetary row includes first planetary row center wheel 6, first planetary row carrier 7 and first planetary row gear 8, the second planetary row includes second planetary row carrier 18 and second planetary row center wheel 19, the first planetary row carrier 7 is used as the second planetary row gear, the first planetary row center wheel 6 and the second planetary row center wheel 19 are fixedly connected to the first transmission shaft 5, and the first planetary row carrier 7 is connected with the input shaft 1 by first gear pair 22 in transmission;

[0080] The first dual-state logic variable unit includes third planetary row, second brake 9, second transmission shaft 14 and second clutch 15, and the third planetary row is double-stage planetary row of six planetary gears, including third planetary row gear 10, third planetary row carrier 11 and third planetary row center wheel 12, the third planetary row carrier 11 is fixedly connected to the output shaft 13, the third planetary row center wheel 12 is fixedly connected to the second transmission shaft 14, the second brake 9 is used to brake the third planetary row gear 10, and the second clutch 15 is used to connect the third planetary row gear 10 with the third planetary row center wheel 12;

[0081] The nested clutch includes nested clutch first part 17 and nested clutch second part 16, wherein the nested clutch first part 17 is used to connect the first planetary row gear 8 with the second transmission shaft 14, and the nested clutch second part 16 is used to connect the second planetary row carrier 18 with the second transmission shaft 14.

[0082] The first brake 20 is used to brake the first planetary row carrier 7, and the first clutch 28 is used to connect the input shaft 1 with the first gear pair 22.

[0083] In the embodiment 1, the first brake 20 and the second brake 9 are both wet multi-plate brakes, and the first clutch 28, the second clutch 15, the nested clutch first part 17 and the nested clutch second part 16 are all wet multi-plate clutches.

[0084] The shift control logic of the embodiment 1 is shown in Table 1, and the clutch and brake combination is shown in Table 2:

[0085] Table 1 Shift control logic of example 1

[0086]

[0087]

[0088] wherein i p is the gear pair ratio before the pump, i0is the first gear pair ratio, k1is the first planetary row characteristic parameter (i.e. the ratio of the number of teeth of the first planetary row ring gear to the sun gear), k2is the second planetary row characteristic parameter, k3is the third planetary row characteristic parameter, and ε is the variable pump displacement ratio.

[0089] Table 2 Clutch, brake engagement of example 1

[0090]

[0091] wherein • indicates engagement, ╳ indicates disengagement, B1indicates the first brake, B2indicates the second brake, C1indicates the first clutch, C2indicates the first clutch, Q1indicates the first part of the nested clutch, and Q2indicates the second part of the nested clutch.

[0092] In combination Figures 8 to 13 , the working principle of example 1 is as follows:

[0093] When the first brake 20 is engaged, the first clutch 28 is disengaged, the second brake 9 is engaged, the second clutch 15 is disengaged, the first part 17 of the nested clutch is engaged, and the second part 16 of the nested clutch is disengaged, the automatic transmission is in the first forward section of the forward gear;

[0094] When the first brake 20 is disengaged, the first clutch 28 is engaged, the second brake 9 is engaged, the second clutch 15 is disengaged, the first part 17 of the nested clutch is disengaged, and the second part 16 of the nested clutch is engaged, the automatic transmission is in the second forward section of the forward gear;

[0095] When the first brake 20 is disengaged, the first clutch 28 is engaged, the second brake 9 is engaged, the second clutch 15 is disengaged, the first part 17 of the nested clutch is engaged, and the second part 16 of the nested clutch is disengaged, the automatic transmission is in the third forward section of the forward gear;

[0096] When the first brake 20 is engaged, the first clutch 28 is disengaged, the second brake 9 is disengaged, the second clutch 15 is engaged, the first part 17 of the nested clutch is engaged, and the second part 16 of the nested clutch is disengaged, the automatic transmission is in the first reverse section of the forward gear;

[0097] When the first brake 20 is disengaged, the first clutch 28 is engaged, the second brake 9 is disengaged, the second clutch 15 is engaged, the first part 17 of the nested clutch is disengaged, and the second part 16 of the nested clutch is engaged, the automatic transmission is in the reverse segment of the forward gear.

[0098] When the first brake 20 is disengaged, the first clutch 28 is engaged, the second brake 9 is disengaged, the second clutch 15 is engaged, the first part of the nested clutch 17 is engaged, and the second part of the nested clutch 16 is disengaged, the automatic transmission is in the reverse segment of the forward gear.

[0099] Example 2

[0100] like Figure 3 As shown, in Embodiment 2, based on Embodiment 1, the first clutch 28 is removed and a second dual-state logic transmission unit is added. The second dual-state logic transmission unit is located between the input shaft 1 and the first gear pair 22, and includes a fourth planetary gear set, a third drive shaft 21, a third clutch 26, and a third brake 27. The fourth planetary gear set is a single-stage planetary gear set with three planetary gears, including a fourth planetary gear ring 23, a fourth planetary gear carrier 24, and a fourth planetary gear center wheel 25. The fourth planetary gear carrier 24 is fixed to the third drive shaft 21, and the fourth planetary gear center wheel 25 is fixed to the input shaft 1. The third drive shaft 21 and the first planetary gear carrier 7 are connected by the first gear pair 22. The third brake 27 is used to brake the fourth planetary gear ring 23, and the third clutch 26 is used to connect the fourth planetary gear ring 23 and the fourth planetary gear center wheel 25.

[0101] In this embodiment 2, the added third brake 27 is a wet multi-plate brake, and the added third clutch 26 is a wet multi-plate clutch.

[0102] The shift control logic of Example 2 is shown in Table 3, and the clutch and brake engagement is shown in Table 4.

[0103] Table 3 Shift Control Logic of Example 2

[0104]

[0105]

[0106] Where k4 is the characteristic parameter of the fourth planetary array.

[0107] Table 4. Clutch and Brake Engagement Status in Example 2

[0108]

[0109] In this context, B3 represents the third brake and C3 represents the third clutch.

[0110] CombinationFigures 14 to 23 The working principle of Example 2 is as follows:

[0111] When the first brake 20 is engaged, the second brake 9 is engaged, the second clutch 15 is disengaged, the third brake 27 is disengaged, the third clutch 26 is disengaged, the nested clutch first part 17 is engaged, and the nested clutch second part 16 is disengaged, the automatic transmission is in the first forward stage of the forward gear;

[0112] When the first brake 20 is disengaged, the second brake 9 is engaged, the second clutch 15 is disengaged, the third brake 27 is engaged, the third clutch 26 is disengaged, the nested clutch first part 17 is disengaged, and the nested clutch second part 16 is engaged, the automatic transmission is in the second forward stage of the forward gear;

[0113] When the first brake 20 is disengaged, the second brake 9 is engaged, the second clutch 15 is disengaged, the third brake 27 is engaged, the third clutch 26 is disengaged, the nested clutch first part 17 is engaged, and the nested clutch second part 16 is disengaged, the automatic transmission is in the third forward stage of the forward gear;

[0114] When the first brake 20 is disengaged, the second brake 9 is engaged, the second clutch 15 is disengaged, the third brake 27 is disengaged, the third clutch 26 is engaged, the nested clutch first part 17 is disengaged, and the nested clutch second part 16 is engaged, the automatic transmission is in the fourth forward stage of the forward gear;

[0115] When the first brake 20 is disengaged, the second brake 9 is engaged, the second clutch 15 is disengaged, the third brake 27 is disengaged, the third clutch 26 is engaged, the nested clutch first part 17 is engaged, and the nested clutch second part 16 is disengaged, the automatic transmission is in the fifth forward stage of the forward gear;

[0116] When the first brake 20 is engaged, the second brake 9 is disengaged, the second clutch 15 is engaged, the third brake 27 is disengaged, the third clutch 26 is disengaged, the nested clutch first part 17 is engaged, and the nested clutch second part 16 is disengaged, the automatic transmission is in the first reverse stage of the forward gear;

[0117] When the first brake 20 is disengaged, the second brake 9 is disengaged, the second clutch 15 is engaged, the third brake 27 is engaged, the third clutch 26 is disengaged, the nested clutch first part 17 is disengaged, and the nested clutch second part 16 is engaged, the automatic transmission is in the second reverse stage of the forward gear;

[0118] When the first brake 20 is disengaged, the second brake 9 is disengaged, the second clutch 15 is engaged, the third brake 27 is engaged, the third clutch 26 is disengaged, the first part of the nested clutch 17 is engaged, and the second part of the nested clutch 16 is disengaged, the automatic transmission is in the reverse segment of the forward gear.

[0119] When the first brake 20 is disengaged, the second brake 9 is disengaged, the second clutch 15 is engaged, the third brake 27 is disengaged, the third clutch 26 is engaged, the first part of the nested clutch 17 is disengaged, and the second part of the nested clutch 16 is engaged, the automatic transmission is in the reverse segment of the forward gear.

[0120] When the first brake 20 is disengaged, the second brake 9 is disengaged, the second clutch 15 is engaged, the third brake 27 is disengaged, the third clutch 26 is engaged, the first part of the nested clutch 17 is engaged, and the second part of the nested clutch 16 is disengaged, the automatic transmission is in the reverse segment of the forward gear.

[0121] Example 3

[0122] like Figure 4 As shown, in Embodiment 3, based on Embodiment 1, the first brake 20 and the first clutch 28 are removed, and a second dual-state logic transmission unit is added. The second dual-state logic transmission unit is located between the first dual-state logic transmission unit and the output shaft 13, and includes a fourth planetary gear set, a third drive shaft 21, a third clutch 26, and a third brake 27. The fourth planetary gear set is a single-stage planetary gear set with three planetary gears, including a fourth planetary gear ring gear 23, a fourth planetary gear carrier 24, and a fourth planetary gear center wheel 25. The fourth planetary gear carrier 24 is fixed to the output shaft 13, and the fourth planetary gear center wheel 25 is fixed to the third drive shaft 21. The third brake 27 is used to brake the fourth planetary gear ring gear 23, and the third clutch 26 is used to connect the fourth planetary gear ring gear 23 and the fourth planetary gear center wheel 25. The third planetary gear carrier 11 is fixed to the third drive shaft 21.

[0123] In this embodiment 3, the added third brake 27 is a wet multi-plate brake, and the added third clutch 26 is a wet multi-plate clutch.

[0124] The shift control logic of Example 3 is shown in Table 5, and the clutch and brake engagement is shown in Table 6.

[0125] Table 5 Shift Control Logic of Example 3

[0126]

[0127]

[0128] Table 6. Clutch and Brake Engagement Status in Example 3

[0129]

[0130] in combination Figures 24 to 31 The working principle of embodiment 3 is as follows:

[0131] When the second brake 9 is engaged, the second clutch 15 is disengaged, the third brake 27 is engaged, the third clutch 26 is disengaged, the nested clutch first part 17 is disengaged, and the nested clutch second part 16 is engaged, the automatic transmission is in the forward first section of the forward gear;

[0132] When the second brake 9 is engaged, the second clutch 15 is disengaged, the third brake 27 is engaged, the third clutch 26 is disengaged, the nested clutch first part 17 is engaged, and the nested clutch second part 16 is disengaged, the automatic transmission is in the forward second section of the forward gear;

[0133] When the second brake 9 is engaged, the second clutch 15 is disengaged, the third brake 27 is disengaged, the third clutch 26 is engaged, the nested clutch first part 17 is disengaged, and the nested clutch second part 16 is engaged, the automatic transmission is in the forward third section of the forward gear;

[0134] When the second brake 9 is engaged, the second clutch 15 is disengaged, the third brake 27 is disengaged, the third clutch 26 is engaged, the nested clutch first part 17 is engaged, and the nested clutch second part 16 is disengaged, the automatic transmission is in the forward fourth section of the forward gear;

[0135] When the second brake 9 is disengaged, the second clutch 15 is engaged, the third brake 27 is engaged, the third clutch 26 is disengaged, the nested clutch first part 17 is disengaged, and the nested clutch second part 16 is engaged, the automatic transmission is in the reverse first section of the forward gear;

[0136] When the second brake 9 is disengaged, the second clutch 15 is engaged, the third brake 27 is engaged, the third clutch 26 is disengaged, the nested clutch first part 17 is engaged, and the nested clutch second part 16 is disengaged, the automatic transmission is in the reverse second section of the forward gear;

[0137] When the second brake 9 is disengaged, the second clutch 15 is engaged, the third brake 27 is disengaged, the third clutch 26 is engaged, the nested clutch first part 17 is disengaged, and the nested clutch second part 16 is engaged, the automatic transmission is in the reverse third section of the forward gear;

[0138] When the second brake 9 is disengaged, the second clutch 15 is engaged, the third brake 27 is disengaged, the third clutch 26 is engaged, the nested clutch first part 17 is engaged, and the nested clutch second part 16 is disengaged, the automatic transmission is in the reverse fourth section of the forward gear.

[0139] Figures 5 to 7 The (a) figures in the above table respectively represent the curves of the transmission ratio of the forward gearboxes of embodiments 1 to 3 with respect to the variable pump displacement ratio, wherein the intersection points of the curves of different gear positions are the shift points, i.e., the transmission ratio and the displacement ratio do not change before and after the shift. In the process of driving, if it is necessary to switch the gear position, the corresponding shift operation is performed at the shift point, i.e., the engagement and disengagement of the brake and the clutch.

[0140] In combination Figure 1 , embodiments 1 to 3 of the present application form three configurations by changing the number and position of the binary logic transmission units (BLTU), wherein embodiment 1 has no second binary logic transmission unit, and forms a transmission mode of three forward gears and three reverse gears by controlling the clutch and the brake. Embodiment 2 has a front-mounted second binary logic transmission unit, and forms a transmission mode of five forward gears and five reverse gears by controlling the clutch and the brake. Embodiment 3 has a rear-mounted second binary logic transmission unit, and forms a transmission mode of four forward gears and four reverse gears by controlling the clutch and the brake.

[0141] The present application adds modular binary logic transmission units (BLTU) in a combination of series and parallel methods at corresponding positions of the system, and the number of stepless transmission gear positions is 2 n times the number of BLTUs (n), the configuration scheme is flexible, the system complexity is low, and the transmission efficiency is high; the power output ends of the nested double-row planetary gear mechanism are the outermost gear rings of the first planetary row and the planet carrier of the second planetary row, the nested clutch is used to combine the double output ends, the hydraulic transmission device, the power bus device and the modular device are located on the same axis, the structure is compact, and the multi-gear position speed regulation performance matching is facilitated; the gear position switching is realized through the coordinated action of the nested clutch and the BLTU, the power interruption is avoided, and the shift quality is improved.

Claims

1. A hydraulic-mechanical continuously variable transmission with modularly distributed dual-state logic speed change units, characterized in that, It includes an input shaft (1), a hydraulic transmission assembly, a nested double-row planetary gear mechanism, a nested clutch, a first dual-state logic speed change unit, and an output shaft (13). The hydraulic transmission assembly includes a variable pump (3), a fixed displacement motor (4) and a first drive shaft (5). The input shaft (1) is connected to the variable pump (3) through a front gear pair (2), and the fixed displacement motor (4) is fixed to the first drive shaft (5). The nested double-row planetary gear mechanism includes a first planetary gear set and a second planetary gear set. Both the first and second planetary gear sets are single-stage planetary gear sets with three planetary gears. The first planetary gear set includes a first planetary gear set center wheel (6), a first planetary gear set planet carrier (7), and a first planetary gear set ring gear (8). The second planetary gear set includes a second planetary gear set planet carrier (18) and a second planetary gear set center wheel (19). The first planetary gear set planet carrier (7) also serves as the second planetary gear set ring gear. The first planetary gear set center wheel (6) and the second planetary gear set center wheel (19) are fixed to the first drive shaft (5). The power from the input shaft (1) is transmitted to the first planetary gear set planet carrier (7) via the first gear pair (22). The first dual-state logic transmission unit includes a third planetary gear set, a second brake (9), a second drive shaft (14), and a second clutch (15). The third planetary gear set is a two-stage planetary gear set with six planetary gears, including a third planetary gear set ring gear (10), a third planetary gear set planet carrier (11), and a third planetary gear set center wheel (12). The third planetary gear set center wheel (12) is fixed to the second drive shaft (14), and the third planetary gear set planet carrier (11) transmits power to the output shaft (13). The second brake (9) is used to brake the third planetary gear set ring gear (10), and the second clutch (15) is used to connect the third planetary gear set ring gear (10) and the third planetary gear set center wheel (12). The nested clutch includes a first part (17) and a second part (16), wherein the first part (17) is used to connect the first planetary gear ring (8) to the second drive shaft (14), and the second part (16) is used to connect the second planetary gear carrier (18) to the second drive shaft (14).

2. The hydraulic-mechanical continuously variable transmission with modularly combined distribution of dual-state logic speed change units according to claim 1, characterized in that, It also includes a first brake (20) and a first clutch (28), the first brake (20) being used to brake the first planetary carrier (7) of the planetary gear set, and the first clutch (28) being used to connect the input shaft (1) and the first gear pair (22).

3. The hydraulic-mechanical continuously variable transmission with modularly distributed dual-state logic speed change units according to claim 2, characterized in that, The first brake (20) and the second brake (9) are both wet multi-plate brakes; the first clutch (28), the second clutch (15), the first part of the nested clutch (17) and the second part of the nested clutch (16) are all wet multi-plate clutches.

4. The hydraulic-mechanical continuously variable transmission with modularly distributed dual-state logic speed change units according to claim 2, characterized in that, When the first brake (20) is engaged, the first clutch (28) is disengaged, the second brake (9) is engaged, the second clutch (15) is disengaged, the first part (17) of the nested clutch is engaged, and the second part (16) of the nested clutch is disengaged, the transmission is in the forward gear segment one; When the first brake (20) is disengaged, the first clutch (28) is engaged, the second brake (9) is engaged, the second clutch (15) is disengaged, the first part (17) of the nested clutch is disengaged, and the second part (16) of the nested clutch is engaged, the transmission is in the forward gear segment two; When the first brake (20) is disengaged, the first clutch (28) is engaged, the second brake (9) is engaged, the second clutch (15) is disengaged, the first part (17) of the nested clutch is engaged, and the second part (16) of the nested clutch is disengaged, the transmission is in the forward gear three. When the first brake (20) is engaged, the first clutch (28) is disengaged, the second brake (9) is disengaged, the second clutch (15) is engaged, the first part of the nested clutch (17) is engaged, and the second part of the nested clutch (16) is disengaged, the transmission is in the reverse segment of the forward gear. When the first brake (20) is disengaged, the first clutch (28) is engaged, the second brake (9) is disengaged, the second clutch (15) is engaged, the first part (17) of the nested clutch is disengaged, and the second part (16) of the nested clutch is engaged, the transmission is in the reverse segment of the forward gear; When the first brake (20) is disengaged, the first clutch (28) is engaged, the second brake (9) is disengaged, the second clutch (15) is engaged, the first part of the nested clutch (17) is engaged, and the second part of the nested clutch (16) is disengaged, the transmission is in the reverse segment of the forward gear.

5. The hydraulic-mechanical continuously variable transmission with modularly distributed dual-state logic speed change units according to claim 1, characterized in that, It also includes a first brake (20) and a second dual-state logic transmission unit. The second dual-state logic transmission unit is located between the input shaft (1) and the first gear pair (22), and includes a fourth planetary gear set, a third drive shaft (21), a third clutch (26) and a third brake (27). The fourth planetary gear set is a single-stage planetary gear set with three planetary gears, including a fourth planetary gear set ring gear (23), a fourth planetary gear set planet carrier (24) and a fourth planetary gear set center wheel (25). The fourth planetary gear set planet carrier (24) is fixed to the third drive shaft (21), and the fourth planetary gear set center wheel (25) is fixed to the input shaft (1). The third drive shaft (21) and the first planetary gear set planet carrier (7) are connected by the first gear pair (22). The first brake (20) is used to brake the first planetary gear set planet carrier (7). The third brake (27) is used to brake the fourth planetary gear set ring gear (23), and the third clutch (26) is used to connect the fourth planetary gear set ring gear (23) and the fourth planetary gear set center wheel (25).

6. The hydraulic-mechanical continuously variable transmission with modularly combined distribution of dual-state logic speed change units according to claim 5, characterized in that, The first brake (20), the second brake (9), and the third brake (27) are all wet multi-plate brakes; the second clutch (15), the third clutch (26), the first part of the nested clutch (17), and the second part of the nested clutch (16) are all wet multi-plate clutches.

7. The hydraulic-mechanical continuously variable transmission with modularly distributed dual-state logic speed change units according to claim 5, characterized in that, When the first brake (20) is engaged, the second brake (9) is engaged, the second clutch (15) is disengaged, the third brake (27) is disengaged, the third clutch (26) is disengaged, the first part (17) of the nested clutch is engaged, and the second part (16) of the nested clutch is disengaged, the transmission is in the forward gear segment one; When the first brake (20) is disengaged, the second brake (9) is engaged, the second clutch (15) is disengaged, the third brake (27) is engaged, the third clutch (26) is disengaged, the first part of the nested clutch (17) is disengaged, and the second part of the nested clutch (16) is engaged, the transmission is in the forward gear segment two. When the first brake (20) is disengaged, the second brake (9) is engaged, the second clutch (15) is disengaged, the third brake (27) is engaged, the third clutch (26) is disengaged, the first part of the nested clutch (17) is engaged, and the second part of the nested clutch (16) is disengaged, the transmission is in the forward gear three. When the first brake (20) is disengaged, the second brake (9) is engaged, the second clutch (15) is disengaged, the third brake (27) is disengaged, the third clutch (26) is engaged, the first part (17) of the nested clutch is disengaged, and the second part (16) of the nested clutch is engaged, the transmission is in the forward gear segment four. When the first brake (20) is disengaged, the second brake (9) is engaged, the second clutch (15) is disengaged, the third brake (27) is disengaged, the third clutch (26) is engaged, the first part of the nested clutch (17) is engaged, and the second part of the nested clutch (16) is disengaged, the transmission is in the forward gear segment five; When the first brake (20) is engaged, the second brake (9) is disengaged, the second clutch (15) is engaged, the third brake (27) is disengaged, the third clutch (26) is disengaged, the first part (17) of the nested clutch is engaged, and the second part (16) of the nested clutch is disengaged, the transmission is in the reverse segment of the forward gear; When the first brake (20) is disengaged, the second brake (9) is disengaged, the second clutch (15) is engaged, the third brake (27) is engaged, the third clutch (26) is disengaged, the first part of the nested clutch (17) is disengaged, and the second part of the nested clutch (16) is engaged, the transmission is in the reverse segment of the forward gear. When the first brake (20) is disengaged, the second brake (9) is disengaged, the second clutch (15) is engaged, the third brake (27) is engaged, the third clutch (26) is disengaged, the first part (17) of the nested clutch is engaged, and the second part (16) of the nested clutch is disengaged, the transmission is in the reverse segment of the forward gear; When the first brake (20) is disengaged, the second brake (9) is disengaged, the second clutch (15) is engaged, the third brake (27) is disengaged, the third clutch (26) is engaged, the first part (17) of the nested clutch is disengaged, and the second part (16) of the nested clutch is engaged, the transmission is in the reverse segment of the forward gear; When the first brake (20) is disengaged, the second brake (9) is disengaged, the second clutch (15) is engaged, the third brake (27) is disengaged, the third clutch (26) is engaged, the first part of the nested clutch (17) is engaged, and the second part of the nested clutch (16) is disengaged, the transmission is in the reverse segment of the forward gear.

8. The hydraulic-mechanical continuously variable transmission with modularly distributed dual-state logic speed change units according to claim 1, characterized in that, It also includes a second dual-state logic transmission unit, which is located between the first dual-state logic transmission unit and the output shaft (13). The second dual-state logic transmission unit includes a fourth planetary gear set, a third drive shaft (21), a third clutch (26), and a third brake (27). The fourth planetary gear set is a single-stage planetary gear set with three planetary gears, including a fourth planetary gear set ring gear (23), a fourth planetary gear set planet carrier (24), and a fourth planetary gear set center wheel (25). The fourth planetary gear set planet carrier (24) is fixed to the output shaft (13), and the fourth planetary gear set center wheel (25) is fixed to the third drive shaft (21). The third brake (27) is used to brake the fourth planetary gear set ring gear (23), and the third clutch (26) is used to connect the fourth planetary gear set ring gear (23) and the fourth planetary gear set center wheel (25). The third planetary gear set planet carrier (11) is fixed to the third drive shaft (21).

9. The hydraulic-mechanical continuously variable transmission with modularly distributed dual-state logic speed change units according to claim 8, characterized in that, The second brake (9) and the third brake (27) are both wet multi-plate brakes; the second clutch (15), the third clutch (26), the first part of the nested clutch (17) and the second part of the nested clutch (16) are all wet multi-plate clutches.

10. The hydraulic-mechanical continuously variable transmission with modularly distributed dual-state logic speed change units according to claim 8, characterized in that, When the second brake (9) is engaged, the second clutch (15) is disengaged, the third brake (27) is engaged, the third clutch (26) is disengaged, the first part of the nested clutch (17) is disengaged, and the second part of the nested clutch (16) is engaged, the transmission is in the forward gear segment one. When the second brake (9) is engaged, the second clutch (15) is disengaged, the third brake (27) is engaged, the third clutch (26) is disengaged, the first part (17) of the nested clutch is engaged, and the second part (16) of the nested clutch is disengaged, the transmission is in the forward gear segment two. When the second brake (9) is engaged, the second clutch (15) is disengaged, the third brake (27) is disengaged, the third clutch (26) is engaged, the first part of the nested clutch (17) is disengaged, and the second part of the nested clutch (16) is engaged, the transmission is in the forward gear three. When the second brake (9) is engaged, the second clutch (15) is disengaged, the third brake (27) is disengaged, the third clutch (26) is engaged, the first part of the nested clutch (17) is engaged, and the second part of the nested clutch (16) is disengaged, the transmission is in the forward gear segment four. When the second brake (9) is disengaged, the second clutch (15) is engaged, the third brake (27) is engaged, the third clutch (26) is disengaged, the first part of the nested clutch (17) is disengaged, and the second part of the nested clutch (16) is engaged, the transmission is in the reverse section of the forward gear. When the second brake (9) is disengaged, the second clutch (15) is engaged, the third brake (27) is engaged, the third clutch (26) is disengaged, the first part (17) of the nested clutch is engaged, and the second part (16) of the nested clutch is disengaged, the transmission is in the reverse segment of the forward gear. When the second brake (9) is disengaged, the second clutch (15) is engaged, the third brake (27) is disengaged, the third clutch (26) is engaged, the first part (17) of the nested clutch is disengaged, and the second part (16) of the nested clutch is engaged, the transmission is in the reverse segment of the forward gear. When the second brake (9) is disengaged, the second clutch (15) is engaged, the third brake (27) is disengaged, the third clutch (26) is engaged, the first part of the nested clutch (17) is engaged, and the second part of the nested clutch (16) is disengaged, the transmission is in the reverse section of the forward gear.

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