Composite transmission device capable of realizing multi-line transmission and multi-mode switching

Abstract

The invention provides a composite transmission device capable of realizing multi-line transmission and multi-mode switching. Comprising an input component, a first shunting mechanism, a hydraulic transmission mechanism, a second shunting mechanism, a metal belt transmission mechanism, a gear transmission mechanism, an electric transmission mechanism, a first converging mechanism, a second converging mechanism, an output component, a clutch assembly and a brake assembly. The displacement ratio of the hydraulic transmission mechanism, the transmission ratio of the metal belt transmission mechanism and the transmission ratio of the electric transmission mechanism are adjusted, and the clutch assembly and the brake assembly are selectively controlled to be connected. Transmission gears of any one combination, two combinations and three combinations of hydraulic single-flow transmission, metal belt single-flow transmission, electric single-flow transmission and gear single-flow transmission between the input component and the output component can be provided, stepless speed regulation switching between the gears can be achieved, the fault-tolerant rate of system work is increased, and the transmission efficiency is improved. And various working condition requirements of engineering machinery can be met.

Description

Technical Field

[0001] The present invention belongs to the technical field of variable speed transmission devices, and in particular to a composite transmission device capable of realizing multi-route transmission and multi-mode switching. Background Art

[0002] In the current field of transmission technology, the main transmission types can be divided into single-flow transmission and compound transmission according to the different transmission paths. Single-flow transmission modes mainly include hydraulic single-flow transmission, metal belt single-flow transmission, gear single-flow transmission, and electric single-flow transmission. Hydraulic transmission has the advantages of stepless speed regulation, smooth operation, and high torque transmission, but its transmission efficiency and speed regulation accuracy are relatively low, so it can be used during the starting phase. Metal belt transmission can also achieve stepless speed regulation, and its advantages are smooth speed regulation and compact structure for easy layout. However, its speed regulation range and transmission torque are limited, making it suitable for driving under good road conditions. Gear transmission has high reliability and durability due to its mechanical structure, but it can only achieve stepped speed regulation and may cause power interruption during gear shifts. Electric transmission combines the advantages of stepless and precise speed regulation with high transmission efficiency, while significantly improving driving smoothness and comfort. It can also achieve kinetic energy recovery to further save energy consumption. However, its torque carrying capacity is limited, making it suitable for driving under good road conditions such as paved roads. The existing compound transmission modes mainly involve hydraulic and mechanical stepless compound transmission, hydraulic and gear compound transmission, and mechanical stepless and gear compound transmission. The types and numbers of switching modes that can be achieved by existing compound transmission devices are relatively single, making it difficult to meet the needs of complex working conditions.

[0003] The existing technology only involves the design of single-flow transmission devices and a small number of mode-switching compound transmission devices, which cannot fully meet the design requirements of multi-mode transmission devices, especially multiple compound modes, under different working conditions of engineering machinery. Summary of the Invention

[0004] Purpose of the invention: To provide a compound transmission device capable of realizing multi-route transmission and multi-mode switching, so as to solve the above-mentioned problems existing in the prior art.

[0005] In a first aspect, the present invention provides a compound transmission device capable of realizing multi-route transmission and multi-mode switching, comprising an input member, a first diverter mechanism, a hydraulic transmission mechanism, a second diverter mechanism, a metal belt transmission mechanism, a gear transmission mechanism, an electric transmission mechanism, a first confluence mechanism, a second confluence mechanism, an output member, a clutch assembly, and a brake assembly; the clutch assembly selectively connects the input member to the first diverter mechanism and the hydraulic transmission mechanism, respectively, the clutch assembly selectively connects the metal belt transmission mechanism to the first diverter mechanism and the second confluence mechanism, respectively, the clutch assembly selectively connects the second diverter mechanism to the hydraulic transmission mechanism, the first diverter mechanism, and the electric transmission mechanism, respectively, the second diverter mechanism is connected to the gear transmission mechanism, and the clutch assembly selectively connects the second diverter mechanism to the gear transmission mechanism. The first confluence mechanism is selectively connected to the electric transmission mechanism, the gear transmission mechanism and the second confluence mechanism respectively, and the second confluence mechanism is connected to the output member; the brake assembly selectively brakes the sun gear of the first diverter mechanism, the sun gear of the second diverter mechanism, the ring gear of the second diverter mechanism, the ring gear of the gear transmission mechanism, the ring gear of the first confluence mechanism and the ring gear of the second confluence mechanism respectively; thereby, by adjusting the displacement ratio of the hydraulic transmission mechanism, the transmission ratio of the metal belt transmission mechanism and the electric transmission mechanism and selectively controlling the engagement of the clutch assembly and the brake assembly, any one combination, two combinations and three combinations of transmission gears of hydraulic single-flow transmission, metal belt single-flow transmission, electric single-flow transmission and gear single-flow transmission can be provided between the input member and the output member.

[0006] In one embodiment, a combination of transmission gears includes hydraulic single-flow transmission H gear, metal belt single-flow transmission S gear, electric single-flow transmission E gear and gear single-flow transmission G gear; two combinations of transmission gears include hydraulic-metal belt series transmission HS1 gear, hydraulic-electric series transmission HE gear, hydraulic-metal belt convergence transmission HS2 gear, electric-gear convergence transmission EG gear, metal belt-gear diversion transmission SG gear and metal belt-electric diversion transmission SE gear; three combinations of transmission gears include hydraulic-electric-gear series-parallel compound transmission HEG gear, hydraulic-metal belt-electrical parallel compound transmission HSE1 gear and hydraulic-metal belt-electrical series-parallel compound transmission HSE2 gear.

[0007] In one embodiment, the first diverter mechanism includes a first diverter mechanism planetary carrier, a first diverter mechanism sun gear, a first diverter mechanism ring gear and a first diverter mechanism gear pair; the first diverter mechanism planetary carrier, the first diverter mechanism sun gear and the first diverter mechanism ring gear constitute a first diverter mechanism planetary gear train; the first diverter mechanism planetary carrier is connected to the input end of the first diverter mechanism, and the first diverter mechanism sun gear is connected to the output end of the first diverter mechanism.

[0008] In one embodiment, the hydraulic transmission mechanism includes a hydraulic transmission mechanism gear pair, a variable displacement pump, a hydraulic pipeline, and a quantitative motor; the variable displacement pump is connected to the input end of the hydraulic transmission mechanism, and the quantitative motor is connected to the output end of the hydraulic transmission mechanism.

[0009] In one embodiment, the second diverter mechanism includes a second diverter mechanism planetary carrier, a second diverter mechanism sun gear, a second diverter mechanism ring gear and a second diverter mechanism gear pair; the second diverter mechanism planetary carrier, the second diverter mechanism sun gear and the second diverter mechanism ring gear constitute a second diverter planetary gear train; the second diverter mechanism planetary carrier is connected to the input end of the second diverter mechanism, and the second diverter mechanism sun gear is connected to the output end of the second diverter mechanism.

[0010] In one embodiment, the metal belt transmission mechanism includes a metal belt continuously variable transmission; the metal belt continuously variable transmission is connected to the input end and the output end of the metal belt transmission mechanism.

[0011] In one embodiment, the gear transmission mechanism includes a first sun gear of the gear transmission mechanism, a first planetary carrier of the gear transmission mechanism, a first ring gear of the gear transmission mechanism, a second planetary carrier of the gear transmission mechanism and a second ring gear of the gear transmission mechanism; the first sun gear of the gear transmission mechanism, the first planetary carrier of the gear transmission mechanism and the first ring gear of the gear transmission mechanism constitute a first planetary gear train of the gear transmission mechanism; the first ring gear of the gear transmission mechanism acts as the second sun gear of the gear transmission mechanism and constitutes a second planetary gear train of the gear transmission mechanism together with the second planetary carrier of the gear transmission mechanism and the second ring gear of the gear transmission mechanism; the first sun gear of the gear transmission mechanism is connected to the input end of the gear transmission mechanism, and the second ring gear of the gear transmission mechanism is connected to the output end of the gear transmission mechanism.

[0012] In one embodiment, the electric transmission mechanism includes an electric continuously variable transmission; the electric continuously variable transmission is connected to the input end and the output end of the electric transmission mechanism.

[0013] In one embodiment, the first convergence mechanism includes a first convergence mechanism gear pair, a first convergence mechanism ring gear, a first convergence mechanism sun gear and a first convergence mechanism planetary carrier; the first convergence mechanism ring gear, the first convergence mechanism sun gear and the first convergence mechanism planetary carrier constitute a first convergence planetary gear train; the first convergence mechanism sun gear is connected to the input end of the first convergence mechanism, and the first convergence mechanism planetary carrier is connected to the output end of the first convergence mechanism.

[0014] In one embodiment, the second convergence mechanism includes a second convergence mechanism ring gear, a second convergence mechanism planetary carrier, a second convergence mechanism sun gear and a second convergence mechanism gear pair; the second convergence mechanism ring gear, the second convergence mechanism planetary carrier and the second convergence mechanism sun gear constitute a second convergence planetary gear train; the second convergence mechanism ring gear is connected to the input end of the second convergence mechanism, and the second convergence mechanism planetary carrier is connected to the output end of the second convergence mechanism.

[0015] In one embodiment, the clutch assembly includes clutch C1, clutch C2, clutch C3, clutch C4, clutch C5, clutch C6, clutch C7, clutch C8, clutch C9, clutch C 10 、Clutch C 11 、Clutch C 12 、Clutch C 13 、Clutch C 14 、Clutch C 15 Clutch C1 selectively connects the input end of the first diverter mechanism with the input member, clutch C2 selectively connects the input end of the hydraulic transmission mechanism with the hydraulic transmission mechanism gear pair, clutch C3 selectively connects the first diverter mechanism planetary carrier with the first diverter mechanism sun gear, clutch C4 selectively connects the quantitative motor with the output end of the hydraulic transmission mechanism, clutch C5 selectively connects the output end of the hydraulic transmission mechanism with the first diverter mechanism gear pair, clutch C6 selectively connects the second diverter mechanism planetary carrier with the second diverter mechanism sun gear, clutch C7 selectively connects the input end of the metal belt transmission mechanism with the output end of the first diverter mechanism, clutch C8 selectively connects the output end of the metal belt transmission mechanism with the input end of the second converging mechanism, clutch C9 selectively connects the input end of the electric transmission mechanism with the second diverter mechanism gear pair, and clutch C 10 Selectively connect the output end of the electric transmission mechanism to the first merging mechanism gear pair, clutch C 11 Selectively connect the first sun gear of the gear transmission mechanism to the first planetary carrier of the gear transmission mechanism, and clutch C 12 Selectively connect the first merging mechanism planet carrier with the first merging mechanism sun gear, clutch C 13 Selectively connect the output end of the first merging mechanism to the gear pair of the second merging mechanism; Clutch C 14 Selectively connect the second merging mechanism ring gear to the second merging mechanism planet carrier, clutch C 15 The output end of the gear transmission mechanism is selectively connected to the input end of the first merging mechanism.

[0016] In one embodiment, the brake assembly includes brake B1, brake B2, brake B3, brake B4, brake B5, and brake B6; brake B1 selectively brakes the first diverter mechanism sun gear, brake B2 selectively brakes the second diverter mechanism sun gear, brake B3 selectively brakes the second diverter mechanism ring gear, brake B4 selectively brakes the first ring gear of the gear transmission mechanism, brake B5 selectively brakes the first confluence mechanism ring gear, and brake B6 selectively brakes the second confluence mechanism ring gear.

[0017] In one embodiment, by adjusting the displacement ratio of the hydraulic transmission mechanism and controlling the clutches C2, C4, and C 11 、Clutch C 12 、Clutch C 13 、Clutch C 15 , brakes B3 and B6 engage, establishing a hydraulic single-flow transmission H gear between the input and output members. At this point, the gear transmission mechanism and the first merging mechanism are integrally connected. Power transmitted from the input member passes through the hydraulic transmission mechanism, the second diverter mechanism planetary carrier, the second diverter mechanism sun gear, the gear transmission mechanism, the first merging mechanism, the second merging mechanism gear pair, the second merging mechanism sun gear, and the second merging mechanism planetary carrier, and is then output from the output member.

[0018] In one embodiment, by adjusting the transmission ratio of the metal belt transmission mechanism and controlling the clutches C1, C3, C7, C8 and C 14 The first diverter mechanism and the second converging mechanism are fixedly connected as one body, and the power transmitted by the input member passes through the first diverter mechanism, the metal belt transmission mechanism and the second converging mechanism, and is output from the output member.

[0019] In one embodiment, by adjusting the transmission ratio of the electric transmission mechanism and controlling the clutches C1, C5, C9, and C 10 、Clutch C 12 、Clutch C 13 , brake B1, brake B2 and brake B6 are engaged, providing an electrical single-flow transmission E gear between the input member and the output member; at this time, the first confluence mechanism is fixedly connected as a whole, and the power transmitted by the input member passes through the first diverter mechanism planetary carrier, the first diverter mechanism ring gear, the first diverter mechanism gear pair, the second diverter mechanism planetary carrier, the second diverter mechanism ring gear, the second diverter mechanism gear pair, the electric transmission mechanism, the first confluence mechanism, the second confluence mechanism gear pair, the second confluence mechanism sun gear and the second confluence mechanism planetary carrier, and is output from the output member.

[0020] In one embodiment, by controlling clutch C1, clutch C5, clutch C 13 、Clutch C 15, brakes B1, B3, B4, B5, and B6 are engaged, providing a single-flow gear transmission G gear between the input member and the output member. At this time, power transmitted from the input member passes through the first splitter mechanism planetary carrier, the first splitter mechanism ring gear, the first splitter mechanism gear pair, the second splitter mechanism planetary carrier, the second splitter mechanism sun gear, the first sun gear of the gear transmission mechanism, the first planetary carrier of the gear transmission mechanism, the second planetary carrier of the gear transmission mechanism, the second ring gear of the gear transmission mechanism, the first merging mechanism sun gear, the first merging mechanism planetary carrier, the second merging mechanism gear pair, the second merging mechanism sun gear, and the second merging mechanism planetary carrier, and is output from the output member.

[0021] In one embodiment, by adjusting the displacement ratio of the hydraulic transmission mechanism, the transmission ratio of the metal belt transmission mechanism, and controlling the clutches C2, C3, C4, C5, C7, C8, and C 14 The first and second merging mechanisms are fixedly connected, and power transmitted from the input member passes through the hydraulic transmission mechanism, the first splitter mechanism, the metal belt transmission mechanism, and the second merging mechanism before being output from the output member.

[0022] In one embodiment, by adjusting the displacement ratio of the hydraulic transmission mechanism, the transmission ratio of the electric transmission mechanism and controlling the clutches C2, C4, C6, C9, and C 10 、Clutch C 12 、Clutch C 13 and clutch C 14 The hydraulic-electric series transmission HE gear is provided between the input member and the output member. At this point, the second flow-dividing mechanism, the first flow-merging mechanism, and the second flow-merging mechanism are integrally connected. Power transmitted from the input member passes through the hydraulic transmission mechanism, the second flow-dividing mechanism, the electric transmission mechanism, the first flow-merging mechanism, and the second flow-merging mechanism before being output from the output member.

[0023] In one embodiment, by adjusting the displacement ratio of the hydraulic transmission mechanism, the transmission ratio of the metal belt transmission mechanism, and controlling the clutches C1, C2, C3, C4, C7, C8, and C 11 、Clutch C 12 、Clutch C 13 、Clutch C 15Engaging brake B3 establishes the hydraulic-metal belt convergence transmission HS2 between the input and output members. At this point, the first diverter mechanism, gear transmission mechanism, and first convergence mechanism are integrally connected. Power transmitted from the input member is split into two paths: the first path passes through the first diverter mechanism and metal belt transmission mechanism to the second convergence mechanism ring gear; the second path passes through the hydraulic transmission mechanism, the second diverter mechanism planetary carrier, the second diverter mechanism sun gear, the gear transmission mechanism, the first convergence mechanism, and the second convergence mechanism gear pair to the second convergence mechanism sun gear. Both paths converge at the second convergence mechanism planetary carrier and are then output from the output member.

[0024] In one embodiment, by adjusting the transmission ratio of the electric transmission mechanism and controlling the clutches C1, C3, C5, C6, C9, and C 10 、Clutch C 13 、Clutch C 14 、Clutch C 15 Engaging brake B4 provides the electrical-gear convergence transmission EG gear between the input member and the output member. At this point, the first splitter mechanism, second splitter mechanism, and second convergence mechanism are integrally connected. Power transmitted from the input member is split into two paths through the first and second splitter mechanisms. The first path is transmitted through the first sun gear of the gear transmission mechanism, the first planetary carrier of the gear transmission mechanism, the second planetary carrier of the gear transmission mechanism, and the second ring gear of the gear transmission mechanism to the sun gear of the first convergence mechanism. The second path is transmitted through the electrical transmission mechanism and the first convergence mechanism gear pair to the ring gear of the first convergence mechanism. Both paths converge at the first convergence mechanism planetary carrier, pass through the second convergence mechanism, and are output from the output member.

[0025] In one embodiment, by adjusting the transmission ratio of the metal belt transmission mechanism and controlling the clutches C1, C5, C7, C8, and C 13 、Clutch C 14 、Clutch C 15 , brakes B3, B4, and B5 engage, establishing the SG gear of the metal belt-gear splitter transmission between the input and output members. At this point, the second merging mechanism is fixedly connected, and power transmitted from the input member is divided into two paths through the first merging mechanism planetary carrier: the first path passes through the first merging mechanism sun gear and the metal belt transmission mechanism to the second merging mechanism; the second path passes through the first merging mechanism ring gear, the first merging mechanism gear pair, the second merging mechanism planetary carrier, the second merging mechanism sun gear, the first sun gear of the gear transmission mechanism, the first planetary carrier of the gear transmission mechanism, the second planetary carrier of the gear transmission mechanism, the second ring gear of the gear transmission mechanism, the first merging mechanism sun gear, and the first merging mechanism planetary carrier to the second merging mechanism. Both paths merge at the second merging mechanism and are output from the output member.

[0026] In one embodiment, by adjusting the transmission ratio of the metal belt transmission mechanism, the transmission ratio of the electric transmission mechanism and controlling the clutches C1, C5, C7, C8, C9, and C 10 、Clutch C 12 、Clutch C 13 、Clutch C 14 Engaging brake B2 establishes the SE gear for the metal belt-electrical splitter transmission between the input and output members. At this point, the first and second merging mechanisms are fixedly connected, and power transmitted from the input member is split into two paths via the first splitter mechanism planetary carrier. The first path passes through the first splitter mechanism sun gear and the metal belt drive mechanism to the second merging mechanism; the second path passes through the first splitter mechanism ring gear, the first splitter mechanism gear pair, the second splitter mechanism planetary carrier, the second splitter mechanism ring gear, the second splitter mechanism gear pair, the electrical drive mechanism, and the first merging mechanism to the second merging mechanism. The two paths merge at the second merging mechanism and are output from the output member.

[0027] In one embodiment, by adjusting the displacement ratio of the hydraulic transmission mechanism, the transmission ratio of the electric transmission mechanism and controlling the clutches C2, C4, C9, and C 10 、Clutch C 12 、Clutch C 13 、Clutch C 14 、Clutch C 15 Engaging brake B4 establishes the hydraulic-electric-gear series-parallel compound transmission HEG gear between the input member and the output member. At this point, the first and second merging mechanisms are fixedly connected as one body. Power transmitted from the input member is divided into two paths through the hydraulic transmission mechanism and the second diverter mechanism planetary carrier. The first path is transmitted to the first merging mechanism via the second diverter mechanism sun gear, the first sun gear of the gear transmission mechanism, the first planetary carrier of the gear transmission mechanism, the second planetary carrier of the gear transmission mechanism, and the second ring gear of the gear transmission mechanism. The second path is transmitted to the first merging mechanism via the second diverter mechanism ring gear, the second diverter mechanism gear pair, and the electrical transmission mechanism. Both paths merge at the first merging mechanism, pass through the second diverter mechanism, and are output from the output member.

[0028] In one embodiment, by adjusting the displacement ratio of the hydraulic transmission mechanism, the transmission ratio of the metal belt transmission mechanism, the transmission ratio of the electric transmission mechanism, and controlling the clutches C1, C2, C3, C4, C7, C8, C9, and C 10 、Clutch C 12 、Clutch C 13Engaging brake B2 establishes HSE1 gear, a hydraulic-metal belt-electric parallel compound transmission, between the input and output members. At this point, the first diverter mechanism and the first merging mechanism are fixedly connected, and power transmitted from the input member is divided into two paths: the first path passes through the first diverter mechanism and the metal belt drive mechanism to the second merging mechanism ring gear; the second path passes through the hydraulic drive mechanism, the second diverter mechanism planetary carrier, the second diverter mechanism ring gear, the second diverter mechanism gear pair, the electrical drive mechanism, the first merging mechanism, and the second merging mechanism gear pair to the second merging mechanism sun gear. Both paths merge at the second merging mechanism planetary carrier and are output from the output member.

[0029] In one embodiment, by adjusting the displacement ratio of the hydraulic transmission mechanism, the transmission ratio of the metal belt transmission mechanism, the transmission ratio of the electric transmission mechanism, and controlling the clutches C2, C3, C4, C5, C7, C8, C9, and C 10 、Clutch C 12 、Clutch C 13 Engaging brake B2 provides a hydraulic-metal belt-electrical series-parallel composite transmission HSE2 between the input and output members. At this point, the first diverter mechanism and the first merging mechanism are fixedly connected as one body. Power transmitted from the input member is divided into two paths through the hydraulic transmission mechanism: the first path passes through the first diverter mechanism and the metal belt transmission mechanism to the second merging mechanism ring gear. The second path passes through the second diverter mechanism planetary carrier, the second diverter mechanism ring gear, the second diverter mechanism gear pair, the electrical transmission mechanism, the first merging mechanism, and the second merging mechanism gear pair to the second merging mechanism sun gear. Both paths converge at the second merging mechanism planetary carrier and are output from the output member.

[0030] In one embodiment, by adjusting the displacement ratio of the hydraulic transmission mechanism, the transmission ratio of the electric transmission mechanism and selectively controlling the engagement of the clutch and the brake, stepless speed switching of hydraulic single-flow transmission H gear → electrical single-flow transmission E gear, and electrical single-flow transmission E gear → hydraulic-electric series transmission HE gear can be provided.

[0031] In one embodiment, by adjusting the transmission ratio of the metal belt transmission mechanism, the transmission ratio of the electric transmission mechanism and selectively controlling the engagement of the clutch assembly and the brake assembly, stepless speed switching of metal belt single-flow transmission S gear → metal belt-gear split transmission SG gear, metal belt-gear split transmission SG gear → metal belt-electric split transmission SE gear can be provided.

[0032] In one embodiment, by adjusting the displacement ratio of the hydraulic transmission mechanism, the transmission ratio of the electric transmission mechanism and selectively controlling the engagement of the clutch assembly and the brake assembly, stepless speed switching of hydraulic single-flow transmission H gear → electrical single-flow transmission E gear, electrical single-flow transmission E gear → gear single-flow transmission G gear, gear single-flow transmission G gear → electrical-gear convergence transmission EG gear, electrical-gear convergence transmission EG gear → hydraulic-electrical series transmission HE gear, hydraulic-electrical series transmission HE gear → hydraulic-electrical-gear series-parallel compound transmission HEG gear can be provided.

[0033] In one embodiment, by adjusting the displacement ratio of the hydraulic transmission mechanism, the transmission ratio of the metal belt transmission mechanism, the transmission ratio of the electric transmission mechanism and selectively controlling the engagement of the clutch assembly and the brake assembly, stepless speed switching of hydraulic single-flow transmission H gear → metal belt single-flow transmission S gear, metal belt single-flow transmission S gear → hydraulic-metal belt convergence transmission HS2 gear, hydraulic-metal belt convergence transmission HS2 gear → hydraulic-metal belt-electric parallel compound transmission HSE1 gear can be provided.

[0034] In one embodiment, by adjusting the displacement ratio of the hydraulic transmission mechanism, the transmission ratio of the metal belt transmission mechanism, the transmission ratio of the electric transmission mechanism and selectively controlling the engagement of the clutch assembly and the brake assembly, stepless speed switching of hydraulic single-flow transmission H gear → metal belt single-flow transmission S gear, metal belt single-flow transmission S gear → hydraulic-metal belt series transmission HS1 gear, hydraulic-metal belt series transmission HS1 gear → hydraulic-electric series transmission HE gear, hydraulic-electric series transmission HE gear → hydraulic-metal belt-electric series-parallel compound transmission HSE2 gear can be provided.

[0035] The beneficial effects of the present invention are:

[0036] 1. The composite transmission device capable of multi-path transmission and multi-mode switching of the present invention can provide transmission gears between the input member and the output member in any one, two, or three combinations of hydraulic single-flow transmission, metal belt single-flow transmission, electrical single-flow transmission, and gear single-flow transmission by adjusting the displacement ratio of the hydraulic transmission mechanism, the transmission ratio of the metal belt transmission mechanism, and the transmission ratio of the electric transmission mechanism and selectively controlling the engagement of the clutch assembly and the brake assembly. Furthermore, stepless speed regulation can be achieved between the multiple gears, thereby improving the fault tolerance of the system and meeting the various working conditions of engineering machinery.

[0037] 2. The hydraulic-metal belt series transmission HS1 gear of the composite transmission device of the present invention, which can realize multi-route transmission and multi-mode switching, can further widen the speed regulation range compared to the hydraulic single-flow transmission H gear, and realize the needs of stepless speed regulation within a certain range; the hydraulic-electric series transmission HE gear can further widen the speed regulation range and realize a wide range of stepless speed regulation compared to the hydraulic-metal belt series transmission HS1 gear, and can realize precise control of a specific speed range; the hydraulic-metal belt convergence transmission HS2 gear can effectively improve the transmission efficiency of the system and improve fuel economy; the electric-gear convergence transmission EG gear can realize stepless speed regulation while effectively ensuring the working safety of the transmission system through the characteristics of the gear transmission mechanical structure; the metal belt-gear diverter transmission SG gear can effectively avoid the system losing the transmission function due to metal belt breakage or other reasons, and ensure the working stability of the transmission system; the metal belt-electric diverter transmission SE gear can realize the advantages of stepless speed regulation and high transmission efficiency, and can continue to maintain stepless speed regulation transmission even if one of them fails.

[0038] 3. The hydraulic-electric-gear series-parallel composite transmission HEG gear of the composite transmission device capable of realizing multi-route transmission and multi-mode switching of the present invention can effectively improve the system's ability to transmit torque compared to the hydraulic-electric series transmission HE gear; the hydraulic-metal belt-electric parallel composite transmission HSE1 gear can not only improve the system's transmission efficiency and ensure the stability of the system's operation, but also widen the speed regulation range compared to the hydraulic-metal belt convergence transmission HS2 gear; the hydraulic-metal belt-electric series-parallel composite transmission HSE2 gear can avoid the system from being unable to work due to the failure of the metal belt continuously variable transmission or the electric continuously variable transmission, and can continue to maintain the stepless speed regulation transmission even if one of them fails. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the composite transmission device capable of realizing multi-route transmission and multi-mode switching according to the present invention;

[0040] Figure 2 This is a schematic diagram of the power flow of the hydraulic single-flow transmission H gear of the present invention;

[0041] Figure 3 This is a schematic diagram of the power flow of the metal belt single-flow transmission S gear of the present invention;

[0042] Figure 4 This is a schematic diagram of the power flow of the electric single-flow transmission E gear of the present invention;

[0043] Figure 5 This is a schematic diagram of the power flow of the single-flow transmission G gear of the present invention;

[0044] Figure 6This is a schematic diagram of the power flow of the hydraulic-metal belt tandem transmission HS1 gear of the present invention;

[0045] Figure 7 This is a schematic diagram of the power flow of the hydraulic-electric series transmission HE gear of the present invention;

[0046] Figure 8 This is a schematic diagram of the power flow of the hydraulic-metal belt convergence transmission HS2 of the present invention;

[0047] Figure 9 This is a schematic diagram of the power flow of the EG gear of the electric-gear convergence transmission of the present invention;

[0048] Figure 10 This is a schematic diagram of the power flow of the SG gear of the metal belt-gear split transmission of the present invention;

[0049] Figure 11 This is a schematic diagram of the power flow of the metal belt-electrical shunt transmission SE gear of the present invention;

[0050] Figure 12 This is a schematic diagram of the power flow of the hydraulic-electric-gear series-parallel compound transmission HEG gear of the present invention;

[0051] Figure 13 This is a schematic diagram of the power flow of the hydraulic-metal belt-electric parallel compound transmission HSE1 gear of the present invention;

[0052] Figure 14 This is a schematic diagram of the power flow of the hydraulic-metal belt-electric series-parallel composite transmission HSE2 of the present invention. DETAILED DESCRIPTION

[0053] In the following description, numerous specific details are provided to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without one or more of these details. In other instances, certain technical features well known in the art are not described to avoid confusion with the present invention.

[0054] like Figure 1 As shown, the compound transmission device disclosed in this embodiment that can realize multi-route transmission and multi-mode switching includes an input member 1, a first diverter mechanism 2, a hydraulic transmission mechanism 3, a second diverter mechanism 4, a metal belt transmission mechanism 5, a gear transmission mechanism 6, an electric transmission mechanism 7, a first confluence mechanism 8, a second confluence mechanism 9, an output member 10, a clutch assembly and a brake assembly.

[0055] like Figure 1As shown, the first diverter mechanism 2 includes a first diverter mechanism planetary carrier 2-2, a first diverter mechanism sun gear 2-4, a first diverter mechanism ring gear 2-5 and a first diverter mechanism gear pair 2-6; the first diverter mechanism planetary carrier 2-2, the first diverter mechanism sun gear 2-4 and the first diverter mechanism ring gear 2-5 constitute a first diverter mechanism planetary gear train; the first diverter mechanism planetary carrier 2-2 is connected to the input end of the first diverter mechanism 2, and the first diverter mechanism sun gear 2-4 is connected to the output end of the first diverter mechanism 2.

[0056] like Figure 1 As shown, the hydraulic transmission mechanism 3 includes a hydraulic transmission mechanism gear pair 3-1, a variable pump 3-3, a hydraulic pipeline 3-4 and a quantitative motor 3-5; the variable pump 3-3 is connected to the input end of the hydraulic transmission mechanism 3, and the quantitative motor 3-5 is connected to the output end of the hydraulic transmission mechanism 3.

[0057] like Figure 1 As shown, the second diverter mechanism 4 includes a second diverter mechanism planetary carrier 4-1, a second diverter mechanism sun gear 4-3, a second diverter mechanism ring gear 4-4 and a second diverter mechanism gear pair 4-6; the second diverter mechanism planetary carrier 4-1, the second diverter mechanism sun gear 4-3 and the second diverter mechanism ring gear 4-4 constitute a second diverter planetary gear train; the second diverter mechanism planetary carrier 4-1 is connected to the input end of the second diverter mechanism 4, and the second diverter mechanism sun gear 4-3 is connected to the output end of the second diverter mechanism 4.

[0058] like Figure 1 As shown, the metal belt transmission mechanism 5 includes a metal belt continuously variable transmission 5 - 2 ; the metal belt continuously variable transmission 5 - 2 is connected to the input end and the output end of the metal belt transmission mechanism 5 .

[0059] like Figure 1 As shown, the gear transmission mechanism 6 includes the first sun gear 6-1 of the gear transmission mechanism, the first planetary carrier 6-3 of the gear transmission mechanism, the first ring gear 6-5 of the gear transmission mechanism, the second planetary carrier 6-6 of the gear transmission mechanism and the second ring gear 6-7 of the gear transmission mechanism; the first sun gear 6-1 of the gear transmission mechanism, the first planetary carrier 6-3 of the gear transmission mechanism and the first ring gear 6-5 of the gear transmission mechanism constitute the first planetary gear train of the gear transmission mechanism; the first ring gear 6-5 of the gear transmission mechanism acts as the second sun gear of the gear transmission mechanism and constitutes the second planetary gear train of the gear transmission mechanism together with the second planetary carrier 6-6 and the second ring gear 6-7 of the gear transmission mechanism; the first sun gear 6-1 of the gear transmission mechanism is connected to the input end of the gear transmission mechanism 6, and the second ring gear 6-7 of the gear transmission mechanism is connected to the output end of the gear transmission mechanism 6.

[0060] like Figure 1As shown, the electric transmission mechanism 7 includes an electric continuously variable transmission 7 - 2 ; the electric continuously variable transmission 7 - 2 is connected to the input end and the output end of the electric transmission mechanism 7 .

[0061] like Figure 1 As shown, the first convergence mechanism 8 includes a first convergence mechanism gear pair 8-2, a first convergence mechanism ring gear 8-4, a first convergence mechanism sun gear 8-5 and a first convergence mechanism planetary carrier 8-6; the first convergence mechanism ring gear 8-4, the first convergence mechanism sun gear 8-5 and the first convergence mechanism planetary carrier 8-6 constitute a first convergence planetary gear system; the first convergence mechanism sun gear 8-5 is connected to the input end of the first convergence mechanism 8, and the first convergence mechanism planetary carrier 8-6 is connected to the output end of the first convergence mechanism 8.

[0062] like Figure 1 As shown, the second convergence mechanism 9 includes a second convergence mechanism ring gear 9-1, a second convergence mechanism planetary carrier 9-3, a second convergence mechanism sun gear 9-4 and a second convergence mechanism gear pair 9-6; the second convergence mechanism ring gear 9-1, the second convergence mechanism planetary carrier 9-3 and the second convergence mechanism sun gear 9-4 constitute a second convergence planetary gear train; the second convergence mechanism ring gear 9-1 is connected to the input end of the second convergence mechanism 9, and the second convergence mechanism planetary carrier 9-3 is connected to the output end of the second convergence mechanism 9.

[0063] like Figure 1 As shown, the clutch assembly includes clutch C12-1, clutch C23-2, clutch C32-3, clutch C43-6, clutch C53-7, clutch C64-2, clutch C75-1, clutch C85-3, clutch C97-1, clutch C 10 7-3. Clutch C 11 6-2. Clutch C 12 8-7. Clutch C 13 8-8. Clutch C 14 9-2. Clutch C 158-1; wherein the clutch C12-1 selectively connects the input end of the first diverter mechanism 2 with the input member 1, the clutch C23-2 selectively connects the input end of the hydraulic transmission mechanism 3 with the hydraulic transmission mechanism gear pair 3-1, the clutch C32-3 selectively connects the first diverter mechanism planetary carrier 2-2 with the first diverter mechanism sun gear 2-4, the clutch C43-6 selectively connects the quantitative motor 3-5 with the output end of the hydraulic transmission mechanism 3, and the clutch C53-7 selectively connects the output end of the hydraulic transmission mechanism 3 with The first diverter mechanism gear pair 2-6 is connected, the clutch C64-2 selectively connects the second diverter mechanism planetary carrier 4-1 with the second diverter mechanism sun gear 4-3, the clutch C75-1 selectively connects the input end of the metal belt transmission mechanism 5 with the output end of the first diverter mechanism 2, the clutch C85-3 selectively connects the output end of the metal belt transmission mechanism 5 with the input end of the second converging mechanism 9, the clutch C97-1 selectively connects the input end of the electric transmission mechanism 7 with the second diverter mechanism gear pair 4-6, and the clutch C 10 7-3 selectively connects the output end of the electric transmission mechanism 7 to the first converging mechanism gear pair 8-2, and the clutch C 11 6-2 selectively connects the first sun gear 6-1 of the gear transmission mechanism to the first planetary carrier 6-3 of the gear transmission mechanism, and the clutch C 12 8-7 selectively connects the first merging mechanism planet carrier 8-6 with the first merging mechanism sun gear 8-5, and the clutch C 13 8-8 selectively connects the output end of the first merging mechanism 8 to the second merging mechanism gear pair 9-6; Clutch C 14 9-2 selectively connects the second merging mechanism ring gear 9-1 with the second merging mechanism planet carrier 9-3, and the clutch C 15 8 - 1 selectively connects the output end of the gear transmission mechanism 6 to the input end of the first merging mechanism 8 .

[0064] like Figure 1 As shown, the brake assembly includes brake B12-8, brake B24-7, brake B34-5, brake B46-4, brake B58-3, and brake B69-5; brake B12-8 selectively brakes the first diverter mechanism sun gear 2-4, brake B24-7 selectively brakes the second diverter mechanism sun gear 4-3, brake B34-5 selectively brakes the second diverter mechanism ring gear 4-4, brake B46-4 selectively brakes the first ring gear 6-5 of the gear transmission mechanism, brake B58-3 selectively brakes the first confluence mechanism ring gear 8-4, and brake B69-5 selectively brakes the second confluence mechanism ring gear 9-1.

[0065] like Figure 1As shown, by adjusting the displacement ratio of the hydraulic transmission mechanism 3, the transmission ratio of the metal belt transmission mechanism 5, and the transmission ratio of the electric transmission mechanism 7, and selectively controlling the engagement of the clutch assembly and the brake assembly, any one combination, two combinations, or three combinations of transmission gear positions are provided between the input member 1 and the output member 10, including a hydraulic single-flow transmission, a metal belt single-flow transmission, an electric single-flow transmission, and a gear single-flow transmission. One combination of transmission gear positions includes a hydraulic single-flow transmission H position, a metal belt single-flow transmission S position, an electric single-flow transmission E position, and a gear single-flow transmission G position. Two combinations of transmission gear positions include a hydraulic-metal belt series transmission HS1 position, a hydraulic-electric series transmission HE position, a hydraulic-metal belt merging transmission HS2 position, an electric-gear merging transmission EG position, a metal belt-gear splitter transmission SG position, and a metal belt-electric splitter transmission SE position. Three combinations of transmission gear positions include a hydraulic-electric-gear series-parallel compound transmission HEG position, a hydraulic-metal belt-electric parallel compound transmission HSE1 position, and a hydraulic-metal belt-electric series-parallel compound transmission HSE2 position. The engagement status of each transmission gear shift element is shown in Table 1:

[0066] Table 1

[0067]

[0068]

[0069] Note: ▲ in the table indicates that the actuator is in the engaged state, and the others indicate that the actuator is in the disengaged state.

[0070] Hydraulic single flow transmission H gear: Figure 2 As shown, when clutch C23-2, clutch C43-6, clutch C 11 6-2. Clutch C 12 8-7. Clutch C 13 8-8. Clutch C 15 When the hydraulic transmission mechanism 8-1, brake B34-5, and brake B69-5 are engaged, the gear transmission mechanism 6 and the first merging mechanism 8 are fixedly connected as one body. The power transmitted by the input member 1 (engine) passes through the hydraulic transmission mechanism 3, the second splitter mechanism planetary carrier 4-1, the second splitter mechanism sun gear 4-3, the gear transmission mechanism 6, the first merging mechanism 8, the second merging mechanism gear pair 9-6, the second merging mechanism sun gear 9-4, and the second merging mechanism planetary carrier 9-3, and is output from the output member 10. At this time, the relationship between the output speed and the input speed is:

[0071]

[0072] Metal belt single flow transmission S gear: Figure 3 As shown, when clutch C12-1, clutch C32-3, clutch C75-1, clutch C85-3 and clutch C14 At 9-2, the first diverter mechanism 2 and the second converging mechanism 9 are fixedly connected as one body. The power transmitted by the input member 1 passes through the first diverter mechanism 2, the metal belt transmission mechanism 5 and the second converging mechanism 9 and is output from the output member 10. At this time, the relationship between the output speed and the input speed is:

[0073]

[0074] Electric single flow transmission E gear: Figure 4 As shown, when clutch C12-1, clutch C53-7, clutch C97-1, clutch C 10 7-3. Clutch C 12 8-7. Clutch C 13 When brakes B8-8, B12-8, B24-7, and B69-5 are engaged, the first merging mechanism 8 is fixedly connected as one body. The power transmitted by the input member 1 passes through the first diverter mechanism planetary carrier 2-2, the first diverter mechanism ring gear 2-5, the first diverter mechanism gear pair 2-6, the second diverter mechanism planetary carrier 4-1, the second diverter mechanism ring gear 4-4, the second diverter mechanism gear pair 4-6, the electric transmission mechanism 7, the first merging mechanism 8, the second diverter mechanism gear pair 9-6, the second diverter mechanism sun gear 9-4, and the second diverter mechanism planetary carrier 9-3, and is output from the output member 10. At this time, the relationship between the output speed and the input speed is:

[0075]

[0076] Gear single flow transmission G gear: Figure 5 As shown, when clutch C12-1, clutch C53-7, clutch C 13 8-8. Clutch C 15 When the brakes 8-1, B12-8, B34-5, B46-4, B58-3, and B69-5 are engaged, the power transmitted by the input member 1 passes through the first diverter mechanism planetary carrier 2-2, the first diverter mechanism ring gear 2-5, the first diverter mechanism gear pair 2-6, the second diverter mechanism planetary carrier 4-1, the second diverter mechanism sun gear 4-3, the gear transmission mechanism first sun gear 6-1, the gear transmission mechanism first planetary carrier 6-3, the gear transmission mechanism second planetary carrier 6-6, the gear transmission mechanism second ring gear 6-7, the first converging mechanism sun gear 8-5, the first converging mechanism planetary carrier 8-6, the second converging mechanism gear pair 9-6, the second converging mechanism sun gear 9-4, and the second converging mechanism planetary carrier 9-3, and is output from the output member 10. At this time, the relationship between the output speed and the input speed is:

[0077]

[0078] Hydraulic-metal belt tandem transmission HS1 gear: Figure 6 As shown, when clutch C23-2, clutch C32-3, clutch C43-6, clutch C53-7, clutch C75-1, clutch C85-3 and clutch C 14 At 9-2, the first flow-dividing mechanism 2 and the second flow-merging mechanism 9 are fixedly connected as one body. The power transmitted by the input member 1 passes through the hydraulic transmission mechanism 3, the first flow-dividing mechanism 2, the metal belt transmission mechanism 5 and the second flow-merging mechanism 9, and is output from the output member 10. At this time, the relationship between the output speed and the input speed is:

[0079]

[0080] Hydraulic-electric series transmission HE gear: Figure 7 As shown, when clutch C23-2, clutch C43-6, clutch C64-2, clutch C97-1, clutch C 10 7-3. Clutch C 12 8-7. Clutch C 13 8-8 and clutch C 14 At 9-2, the second flow-dividing mechanism 4, the first flow-merging mechanism 8, and the second flow-merging mechanism 9 are fixedly connected as one body. The power transmitted by the input member 1 passes through the hydraulic transmission mechanism 3, the second flow-dividing mechanism 4, the electric transmission mechanism 7, the first flow-merging mechanism 8, and the second flow-merging mechanism 9, and is output from the output member 10. At this time, the relationship between the output speed and the input speed is:

[0081]

[0082] Hydraulic-metal belt convergence transmission HS2 gear: Figure 8 As shown, when clutch C12-1, clutch C23-2, clutch C32-3, clutch C43-6, clutch C75-1, clutch C85-3, clutch C 11 6-2. Clutch C 12 8-7. Clutch C 13 8-8. Clutch C 15 When the brake 8-1 and brake B34-5 are engaged, the first diverter mechanism 2, gear transmission mechanism 6, and first converging mechanism 8 are fixedly connected as one body. The power transmitted by the input member 1 is divided into two paths: the first path is transmitted through the first diverter mechanism 2 and the metal belt transmission mechanism 5 to the second converging mechanism ring gear 9-1; the second path is transmitted through the hydraulic transmission mechanism 3, the second diverter mechanism planetary carrier 4-1, the second diverter mechanism sun gear 4-3, the gear transmission mechanism 6, the first converging mechanism 8, and the second converging mechanism gear pair 9-6 to the second converging mechanism sun gear 9-4. The two paths converge at the second converging mechanism planetary carrier 9-3 and are output from the output member 10. At this time, the relationship between the output speed and the input speed is:

[0083]

[0084] Electric-gear convergence transmission EG gear: Figure 9 As shown, when clutch C12-1, clutch C32-3, clutch C53-7, clutch C64-2, clutch C97-1, clutch C 10 7-3. Clutch C 13 8-8. Clutch C 14 9-2. Clutch C 15 When the brake B46-4 is engaged, the first diverter mechanism 2, the second diverter mechanism 4, and the second converging mechanism 9 are fixedly connected as one body. The power transmitted by the input member 1 is divided into two paths through the first diverter mechanism 2 and the second diverter mechanism 4: the first path is transmitted through the first sun gear 6-1 of the gear transmission mechanism, the first planetary carrier 6-3 of the gear transmission mechanism, the second planetary carrier 6-6 of the gear transmission mechanism, and the second ring gear 6-7 of the gear transmission mechanism to the sun gear 8-5 of the first converging mechanism; the second path is transmitted through the electric transmission mechanism 7 and the first converging mechanism gear pair 8-2 to the ring gear 8-4 of the first converging mechanism. The two paths converge at the first converging mechanism planetary carrier 8-6, pass through the second converging mechanism 9, and are output from the output member 10. At this time, the relationship between the output speed and the input speed is:

[0085]

[0086] Metal belt-gear split transmission SG gear: Figure 10 As shown, when clutch C12-1, clutch C53-7, clutch C75-1, clutch C85-3, clutch C 13 8-8. Clutch C 14 9-2. Clutch C 15 When brakes 8-1, B34-5, B46-4, and B58-3 are engaged, the second converging mechanism 9 is fixedly connected as one, and the power transmitted by the input member 1 is divided into two paths through the first diverter mechanism planetary carrier 2-2: the first path is transmitted to the second converging mechanism 9 through the first diverter mechanism sun gear 2-4 and the metal belt transmission mechanism 5; the second path is transmitted to the second converging mechanism 9 through the first diverter mechanism ring gear 2-5, the first diverter mechanism gear pair 2-6, the second diverter mechanism planetary carrier 4-1, the second diverter mechanism sun gear 4-3, the gear transmission mechanism first sun gear 6-1, the gear transmission mechanism first planetary carrier 6-3, the gear transmission mechanism second planetary carrier 6-6, the gear transmission mechanism second ring gear 6-7, the first converging mechanism sun gear 8-5, and the first converging mechanism planetary carrier 8-6; the two paths converge at the second converging mechanism 9 and are output from the output member 10. At this time, the relationship between the output speed and the input speed is:

[0087]

[0088] Metal belt-electrical shunt transmission SE gear: Figure 11 As shown, when clutch C12-1, clutch C53-7, clutch C75-1, clutch C85-3, clutch C97-1, clutch C 10 7-3. Clutch C 12 8-7. Clutch C 13 8-8. Clutch C 14 When the brake 9-2 and brake B24-7 are engaged, the first merging mechanism 8 and the second merging mechanism 9 are fixedly connected as one body. The power transmitted by the input member 1 is divided into two paths through the first diverter mechanism planetary carrier 2-2: the first path is transmitted to the second merging mechanism 9 through the first diverter mechanism sun gear 2-4 and the metal belt transmission mechanism 5; the second path is transmitted to the second merging mechanism 9 through the first diverter mechanism ring gear 2-5, the first diverter mechanism gear pair 2-6, the second diverter mechanism planetary carrier 4-1, the second diverter mechanism ring gear 4-4, the second diverter mechanism gear pair 4-6, the electric transmission mechanism 7, and the first diverter mechanism 8. The two paths merge at the second diverter mechanism 9 and are output from the output member 10. At this time, the relationship between the output speed and the input speed is:

[0089]

[0090] Hydraulic-electric-gear series-parallel compound transmission HEG gear: Figure 12 As shown, when clutch C23-2, clutch C43-6, clutch C97-1, clutch C 10 7-3. Clutch C 12 8-7. Clutch C 13 8-8. Clutch C 14 9-2. Clutch C 15 When the hydraulic transmission mechanism 8-1 and the brake B46-4 are engaged, the first merging mechanism 8 and the second merging mechanism 9 are fixedly connected as one body. The power transmitted by the input member 1 is divided into two paths through the hydraulic transmission mechanism 3 and the second diverter mechanism planetary carrier 4-1. The first path is transmitted to the first merging mechanism 8 through the second diverter mechanism sun gear 4-3, the gear transmission mechanism first sun gear 6-1, the gear transmission mechanism first planetary carrier 6-3, the gear transmission mechanism second planetary carrier 6-6, and the gear transmission mechanism second ring gear 6-7. The second path is transmitted to the first merging mechanism 8 through the second diverter mechanism ring gear 4-4, the second diverter mechanism gear pair 4-6, and the electrical transmission mechanism 7. The two paths merge at the first merging mechanism 8, pass through the second diverter mechanism 9, and are output from the output member 10. At this time, the relationship between the output speed and the input speed is:

[0091]

[0092] Hydraulic-metal belt-electric parallel compound transmission HSE1 gear: Figure 13 As shown, when clutch C12-1, clutch C23-2, clutch C32-3, clutch C43-6, clutch C75-1, clutch C85-3, clutch C97-1, clutch C 10 7-3. Clutch C 12 8-7. Clutch C 13 When 8-8 and brake B24-7 are engaged, the first diverter mechanism 2 and the first converging mechanism 8 are fixedly connected as one body. The power transmitted by the input member 1 is divided into two paths: the first path passes through the first diverter mechanism 2 and the metal belt drive mechanism 5 to the second converging mechanism ring gear 9-1; the second path passes through the hydraulic transmission mechanism 3, the second diverter mechanism planetary carrier 4-1, the second diverter mechanism ring gear 4-4, the second diverter mechanism gear pair 4-6, the electrical transmission mechanism 7, the first converging mechanism 8, and the second converging mechanism gear pair 9-6 to the second converging mechanism sun gear 9-4. The two paths converge at the second converging mechanism planetary carrier 9-3 and are output from the output member 10. At this time, the relationship between the output speed and the input speed is:

[0093]

[0094] Hydraulic-metal belt-electric series-parallel compound transmission HSE2 gear: Figure 14 As shown, when clutch C23-2, clutch C32-3, clutch C43-6, clutch C53-7, clutch C75-1, clutch C85-3, clutch C97-1, clutch C 10 7-3. Clutch C 12 8-7. Clutch C 13 When 8-8 and brake B24-7 are engaged, the first diverter mechanism 2 and the first converging mechanism 8 are fixedly connected as one body. The power transmitted by the input member 1 is divided into two paths through the hydraulic transmission mechanism 3: the first path passes through the first diverter mechanism 2 and the metal belt transmission mechanism 5 to the second converging mechanism ring gear 9-1; the second path passes through the second diverter mechanism planetary carrier 4-1, the second diverter mechanism ring gear 4-4, the second diverter mechanism gear pair 4-6, the electrical transmission mechanism 7, the first converging mechanism 8, and the second converging mechanism gear pair 9-6 to the second converging mechanism sun gear 9-4. The two paths converge at the second converging mechanism planetary carrier 9-3 and are output from the output member 10. At this time, the relationship between the output speed and the input speed is:

[0095]

[0096] In the above formula, n0 is the output shaft speed; n iis the engine speed; e is the displacement ratio of the hydraulic transmission mechanism; k1 is the characteristic parameter of the planetary gear of the first splitter mechanism; k2 is the characteristic parameter of the planetary gear of the second splitter mechanism; k3 is the characteristic parameter of the first planetary gear of the gear transmission mechanism; k4 is the characteristic parameter of the second planetary gear of the gear transmission mechanism; k5 is the characteristic parameter of the planetary gear of the first merging mechanism; k6 is the characteristic parameter of the planetary gear of the second merging mechanism; i e is the transmission ratio of the electric transmission mechanism; i s is the transmission ratio of the metal belt transmission; i1 is the transmission ratio of the hydraulic transmission mechanism gear pair; i2 is the transmission ratio of the first diverter mechanism gear pair; i3 is the transmission ratio of the second diverter mechanism gear pair; i4 is the transmission ratio of the first confluence mechanism gear pair; i5 is the transmission ratio of the second confluence mechanism gear pair.

[0097] When k1=1.5, k2=2, k3=1.5, k4=3, k5=1.5, k6=1.5, i1i2=0.5, i1i5=0.5, i2i5=1, i3i4=1, i5=1, i4=0.5, e∈[0,1],i s ∈[0.5,2],i e ∈[0.2, 3.75], the transmission range of the hydraulic single-flow transmission H gear is [0, 2.40]n i The transmission range of the S gear of the metal belt single-flow transmission is [0.50, 2.00]n i ; The transmission range of the E gear of the electric single-flow transmission is [0.27, 5.00]n i The transmission range of the single-flow transmission G gear is 0.43n i ; The transmission range of HS1 gear of hydraulic-metal belt tandem transmission is [0, 4.00]n i ; The transmission range of the HE gear of the hydraulic-electric series transmission is [0, 10.00]n i ; The transmission range of HS2 gear of hydraulic-metal belt convergence transmission is [0.30, 3.60]n i The transmission range of the EG gear of the electric-gear convergence transmission is [0.37, 3.21]n i The transmission range of the SG gear of the metal belt-gear split transmission is [0.58, 0.88]n i The transmission range of SE gear of metal belt-electrical shunt transmission is [0.43, 3.57]n i The transmission range of the HEG gear of the hydraulic-electric-gear series-parallel compound transmission is [0, 2.64]n i The transmission range of the hydraulic-metal belt-electric parallel compound transmission HSE1 gear is [0.30, 7.20]n i The transmission range of the hydraulic-metal belt-electric series-parallel compound transmission HSE2 is [0, 8.40]ni .

[0098] By adjusting the displacement ratio of the hydraulic transmission mechanism 3, the transmission ratio of the electric transmission mechanism 7 and selectively controlling the engagement of the clutch assembly and the brake assembly, stepless speed regulation switching of the hydraulic single-flow transmission H gear → the electric single-flow transmission E gear, and the electric single-flow transmission E gear → the hydraulic-electric series transmission HE gear can be provided; when e*i e =0.42, e∈[0.11, 1.00], i e ∈[0.42, 3.75], the hydraulic single-flow transmission H gear and the electric single-flow transmission E gear can be switched without power interruption, and the speed regulation range of the electric single-flow transmission E gear after switching is [0.27, 5.00]; when e=0.5, i e When ∈[0.20, 3.75], the electric single-flow transmission E gear and the hydraulic-electric series transmission HE gear can be switched without power interruption, and the speed regulation range of the hydraulic-electric series transmission HE gear after switching is [0, 10.00].

[0099] By adjusting the transmission ratio of the metal belt transmission mechanism 5, the transmission ratio of the electric transmission mechanism 7 and selectively controlling the engagement of the clutch assembly and the brake assembly, stepless speed regulation switching of metal belt single flow transmission S gear → metal belt-gear split flow transmission SG gear, metal belt-gear split flow transmission SG gear → metal belt-electric split flow transmission SE gear can be provided; when i s =1.56, the metal belt single flow transmission S gear and the metal belt-gear split flow transmission SG gear can be switched without power interruption, and the speed adjustment range of the metal belt-gear split flow transmission SG gear after switching is [0.58, 0.88]; when i e =2.34,i s When ∈[0.50, 2.00], the metal belt-gear shunt transmission SG gear and the metal belt-electric shunt transmission SE gear can be switched without power interruption, and the speed regulation range of the metal belt-electric shunt transmission SE gear after switching is [0.43, 3.57].

[0100] By adjusting the displacement ratio of the hydraulic transmission mechanism 3, the transmission ratio of the electric transmission mechanism 7 and selectively controlling the engagement of the clutch assembly and the brake assembly, stepless speed regulation switching of hydraulic single-flow transmission H gear → electric single-flow transmission E gear, electric single-flow transmission E gear → gear single-flow transmission G gear, gear single-flow transmission G gear → electric-gear convergence transmission EG gear, electric-gear convergence transmission EG gear → hydraulic-electrical series transmission HE gear, hydraulic-electrical series transmission HE gear → hydraulic-electrical-gear series-parallel compound transmission HEG gear can be provided; when e*i e =0.42, e∈[0.11, 1.00], i e∈[0.42, 3.75], the hydraulic single-flow transmission H gear and the electric single-flow transmission E gear can be switched without power interruption, and the speed regulation range of the electric single-flow transmission E gear after switching is [0.27, 5.00]; when i e = 2.35, the electric single-flow transmission E gear and the gear single-flow transmission G gear can be switched without power interruption, and the speed adjustment range of the gear single-flow transmission G gear after switching is 0.43; when i e = 2.82, the gear single-flow transmission G gear and the electric-gear convergence transmission EG gear can be switched without power interruption, and the speed regulation range of the electric-gear convergence transmission EG gear after switching is [0.37, 3.21]; when e and i e Comply with the relationship: e∈[0.32,0.70],i e ∈[0.20, 3.75], the electric-gear convergence transmission EG gear and the hydraulic-electric series transmission HE gear can be switched without power interruption, and the speed regulation range of the hydraulic-electric series transmission HE gear after switching is [0, 10.00]; when i e =1.88, e∈[0,1], the hydraulic-electric series transmission HE gear and the hydraulic-electric-gear series-parallel compound transmission HEG gear can be switched without power interruption, and the speed regulation range of the hydraulic-electric-gear series-parallel compound transmission HEG gear after switching is [0, 2.64].

[0101] By adjusting the displacement ratio of the hydraulic transmission mechanism 3, the transmission ratio of the metal belt transmission mechanism 5, the transmission ratio of the electric transmission mechanism 7 and selectively controlling the engagement of the clutch assembly and the brake assembly, stepless speed regulation switching can be provided: hydraulic single-flow transmission H gear → metal belt single-flow transmission S gear, metal belt single-flow transmission S gear → hydraulic-metal belt convergence transmission HS2 gear, hydraulic-metal belt convergence transmission HS2 gear → hydraulic-metal belt-electric parallel compound transmission HSE1 gear; when e*i s =0.42, e∈[0.21, 0.83], i s ∈[0.50, 2.00], the hydraulic single-flow transmission H gear and the metal belt single-flow transmission S gear can be switched without power interruption, and the speed regulation range of the metal belt single-flow transmission S gear after switching is [0.50, 2.00]; when e*i s =0.17, e∈[0.08, 0.33], i s ∈[0.50, 2.00], the metal belt single flow transmission S gear and the hydraulic-metal belt convergence transmission HS2 gear can be switched without power interruption, and the speed regulation range of the hydraulic-metal belt convergence transmission HS2 gear after switching is [0.30, 3.60]; when i e =0.5,e∈[0,1.00],i sWhen ∈[0.50, 2.00], the hydraulic-metal belt convergence transmission HS2 gear and the hydraulic-metal belt-electric parallel composite transmission HSE1 gear can be switched without power interruption, and after switching, the speed regulation range of the hydraulic-metal belt-electric parallel composite transmission HSE1 gear is [0.30, 7.20].

[0102] By adjusting the displacement ratio of the hydraulic transmission mechanism 3, the transmission ratio of the metal belt transmission mechanism 5, the transmission ratio of the electric transmission mechanism 7 and selectively controlling the engagement of the clutch assembly and the brake assembly, stepless speed regulation switching of hydraulic single-flow transmission H gear → metal belt single-flow transmission S gear, metal belt single-flow transmission S gear → hydraulic-metal belt series transmission HS1 gear, hydraulic-metal belt series transmission HS1 gear → hydraulic-electric series transmission HE gear, hydraulic-electric series transmission HE gear → hydraulic-metal belt-electric series-parallel compound transmission HSE2 gear can be provided; when e*i s =0.42, e∈[0.21, 0.83], i s ∈[0.50, 2.00], the hydraulic single-flow transmission H gear and the metal belt single-flow transmission S gear can be switched without power interruption, and the speed regulation range of the metal belt single-flow transmission S gear after switching is [0.50, 2.00]; when e=0.5, i s ∈[0.50, 2.00], the metal belt single-flow transmission S gear and the hydraulic-metal belt series transmission HS1 gear can be switched without power interruption, and the speed regulation range of the hydraulic-metal belt series transmission HS1 gear after switching is [0, 4.00]; when i s =i e ,i s ∈[0.50, 2.00], i e ∈[0.50, 2.00], the hydraulic-metal belt series transmission HS1 gear and the hydraulic-electric series transmission HE gear can be switched without power interruption, and the speed regulation range of the hydraulic-electric series transmission HE gear after switching is [0, 10.00]; when i s =1.5*i e ,i s ∈[0.50, 2.00], i e When ∈[0.33, 1.33], the hydraulic-electric series transmission HE gear and the hydraulic-metal belt-electric series-parallel composite transmission HSE2 gear can be switched without power interruption, and the speed regulation range of the hydraulic-metal belt-electric series-parallel composite transmission HSE2 gear after switching is [0, 8.40].

[0103] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all fall within the scope of protection of the present invention.

Claims

1. A compound transmission device capable of realizing multi-route transmission and multi-mode switching, characterized in that: The invention comprises an input member, a first diverter mechanism, a hydraulic transmission mechanism, a second diverter mechanism, a metal belt transmission mechanism, a gear transmission mechanism, an electric transmission mechanism, a first merging mechanism, a second merging mechanism, an output member, a clutch assembly, and a brake assembly; the clutch assembly selectively connects the input member with the first diverter mechanism and the hydraulic transmission mechanism, the clutch assembly selectively connects the metal belt transmission mechanism with the first diverter mechanism and the second merging mechanism, the clutch assembly selectively connects the second diverter mechanism with the hydraulic transmission mechanism, the first diverter mechanism, and the electric transmission mechanism, the second diverter mechanism with the gear transmission mechanism, the clutch assembly selectively connects the first merging mechanism with the electric transmission mechanism, the gear transmission mechanism, and the second merging mechanism, and the second merging mechanism is connected to the output member; the brake assembly selectively brakes the sun gear of the first diverter mechanism, the sun gear of the second diverter mechanism, the ring gear of the second diverter mechanism, the ring gear of the gear transmission mechanism, the ring gear of the first merging mechanism, and the ring gear of the second merging mechanism; Thus, by adjusting the displacement ratio of the hydraulic transmission mechanism, the transmission ratio of the metal belt transmission mechanism and the electric transmission mechanism, and selectively controlling the engagement of the clutch assembly and the brake assembly, any one combination, two combinations, and three combinations of transmission gears of hydraulic single-flow transmission, metal belt single-flow transmission, electric single-flow transmission, and gear single-flow transmission can be provided between the input member and the output member; one combination of transmission gears includes hydraulic single-flow transmission H gear, metal belt single-flow transmission S gear, electric single-flow transmission E gear, and gear single-flow transmission G gear; two combinations of transmission gears include hydraulic-metal belt series transmission HS1 gear, hydraulic-electric series transmission HE gear, hydraulic-metal belt convergence transmission HS2 gear, electric-gear convergence transmission EG gear, metal belt-gear split transmission SG gear, and metal belt-electric split transmission SE gear; three combinations of transmission gears include hydraulic-electric-gear series-parallel compound transmission HEG gear, hydraulic-metal belt-electric parallel compound transmission HSE1 gear, and hydraulic-metal belt-electric series-parallel compound transmission HSE2 gear.

2. The compound transmission device capable of realizing multi-path transmission and multi-mode switching according to claim 1, characterized in that: The first flow splitter mechanism includes a first flow splitter mechanism planet carrier, a first flow splitter mechanism sun gear, a first flow splitter mechanism ring gear, and a first flow splitter mechanism gear pair; the first flow splitter mechanism planet carrier, the first flow splitter mechanism sun gear, and the first flow splitter mechanism ring gear constitute a first flow splitter mechanism planetary gear train; the first flow splitter mechanism planet carrier is connected to the input end of the first flow splitter mechanism, and the first flow splitter mechanism sun gear is connected to the output end of the first flow splitter mechanism; The hydraulic transmission mechanism includes a hydraulic transmission mechanism gear pair, a variable displacement pump, a hydraulic pipeline and a quantitative motor; the variable displacement pump is connected to the input end of the hydraulic transmission mechanism, and the quantitative motor is connected to the output end of the hydraulic transmission mechanism; The second flow splitter mechanism includes a second flow splitter mechanism planet carrier, a second flow splitter mechanism sun gear, a second flow splitter mechanism ring gear, and a second flow splitter mechanism gear pair; the second flow splitter mechanism planet carrier, the second flow splitter mechanism sun gear, and the second flow splitter mechanism ring gear constitute a second flow splitter planetary gear train; the second flow splitter mechanism planet carrier is connected to the input end of the second flow splitter mechanism, and the second flow splitter mechanism sun gear is connected to the output end of the second flow splitter mechanism; The metal belt transmission mechanism includes a metal belt continuously variable transmission; the metal belt continuously variable transmission is connected to the input end and the output end of the metal belt transmission mechanism; The gear transmission mechanism includes a first sun gear of the gear transmission mechanism, a first planetary carrier of the gear transmission mechanism, a first ring gear of the gear transmission mechanism, a second planetary carrier of the gear transmission mechanism, and a second ring gear of the gear transmission mechanism; the first sun gear of the gear transmission mechanism, the first planetary carrier of the gear transmission mechanism, and the first ring gear of the gear transmission mechanism constitute a first planetary gear train of the gear transmission mechanism; the first ring gear of the gear transmission mechanism serves as the second sun gear of the gear transmission mechanism and constitutes a second planetary gear train of the gear transmission mechanism with the second planetary carrier of the gear transmission mechanism and the second ring gear of the gear transmission mechanism; the first sun gear of the gear transmission mechanism is connected to the input end of the gear transmission mechanism, and the second ring gear of the gear transmission mechanism is connected to the output end of the gear transmission mechanism; The electric transmission mechanism includes an electric continuously variable transmission; the electric continuously variable transmission is connected to the input end and the output end of the electric transmission mechanism; The first merging mechanism includes a first merging mechanism gear pair, a first merging mechanism ring gear, a first merging mechanism sun gear and a first merging mechanism planet carrier; the first merging mechanism ring gear, the first merging mechanism sun gear and the first merging mechanism planet carrier constitute a first merging planetary gear train; the first merging mechanism sun gear is connected to the input end of the first merging mechanism, and the first merging mechanism planet carrier is connected to the output end of the first merging mechanism; The second merging mechanism includes a second merging mechanism ring gear, a second merging mechanism planet carrier, a second merging mechanism sun gear, and a second merging mechanism gear pair; the second merging mechanism ring gear, the second merging mechanism planet carrier, and the second merging mechanism sun gear constitute a second merging planetary gear train; the second merging mechanism ring gear is connected to the input end of the second merging mechanism, and the second merging mechanism planet carrier is connected to the output end of the second merging mechanism; The clutch assembly includes clutch C1, clutch C2, clutch C3, clutch C4, clutch C5, clutch C6, clutch C7, clutch C8, clutch C9, clutch C 10 、Clutch C 11 、Clutch C 12 、Clutch C 13 、Clutch C 14 、Clutch C 15 Clutch C1 selectively connects the input end of the first diverter mechanism with the input member, clutch C2 selectively connects the input end of the hydraulic transmission mechanism with the hydraulic transmission mechanism gear pair, clutch C3 selectively connects the first diverter mechanism planetary carrier with the first diverter mechanism sun gear, clutch C4 selectively connects the quantitative motor with the output end of the hydraulic transmission mechanism, clutch C5 selectively connects the output end of the hydraulic transmission mechanism with the first diverter mechanism gear pair, clutch C6 selectively connects the second diverter mechanism planetary carrier with the second diverter mechanism sun gear, clutch C7 selectively connects the input end of the metal belt transmission mechanism with the output end of the first diverter mechanism, clutch C8 selectively connects the output end of the metal belt transmission mechanism with the input end of the second converging mechanism, clutch C9 selectively connects the input end of the electric transmission mechanism with the second diverter mechanism gear pair, and clutch C 10 Selectively connect the output end of the electric transmission mechanism to the first merging mechanism gear pair, clutch C 11 Selectively connect the first sun gear of the gear transmission mechanism to the first planetary carrier of the gear transmission mechanism, and clutch C 12 Selectively connect the first merging mechanism planet carrier with the first merging mechanism sun gear, clutch C 13 Selectively connect the output end of the first merging mechanism to the gear pair of the second merging mechanism, and clutch C 14 Selectively connect the second merging mechanism ring gear to the second merging mechanism planet carrier, clutch C 15 selectively connecting the output end of the gear transmission mechanism to the input end of the first merging mechanism; The brake assembly includes brake B1, brake B2, brake B3, brake B4, brake B5, and brake B6; brake B1 selectively brakes the first diverter mechanism sun gear, brake B2 selectively brakes the second diverter mechanism sun gear, brake B3 selectively brakes the second diverter mechanism ring gear, brake B4 selectively brakes the first ring gear of the gear transmission mechanism, brake B5 selectively brakes the first confluence mechanism ring gear, and brake B6 selectively brakes the second confluence mechanism ring gear.

3. The compound transmission device capable of realizing multi-path transmission and multi-mode switching according to claim 2, characterized in that: By adjusting the displacement ratio of the hydraulic transmission mechanism and controlling the clutch C2, clutch C4, clutch C 11 、Clutch C 12 、Clutch C 13 、Clutch C 15 , brake B3 and brake B6 are engaged, providing a hydraulic single-flow transmission H gear between the input member and the output member; By adjusting the transmission ratio of the metal belt transmission mechanism and controlling the clutch C1, clutch C3, clutch C7, clutch C8 and clutch C 14 Engagement provides a metal belt single-flow transmission S gear between the input member and the output member; By adjusting the transmission ratio of the electric transmission mechanism and controlling the clutch C1, clutch C5, clutch C9, clutch C 10 、Clutch C 12 、Clutch C 13 , brake B1, brake B2 and brake B6 are engaged, providing an electric single-flow transmission E gear between the input member and the output member; By controlling clutch C1, clutch C5, clutch C 13 、Clutch C 15 , brake B1 , brake B3 , brake B4 , brake B5 and brake B6 are engaged to provide a gear single-flow transmission G gear between the input member and the output member.

4. The compound transmission device capable of realizing multi-path transmission and multi-mode switching according to claim 2, characterized in that: By adjusting the displacement ratio of the hydraulic transmission mechanism, the transmission ratio of the metal belt transmission mechanism and controlling the clutches C2, C3, C4, C5, C7, C8 and C 14 Engage to provide HS1 gear of hydraulic-metal belt tandem transmission between input member and output member; By adjusting the displacement ratio of the hydraulic transmission mechanism, the transmission ratio of the electric transmission mechanism and controlling the clutch C2, clutch C4, clutch C6, clutch C9, clutch C 10 、Clutch C 12 、Clutch C 13 and clutch C 14 Engagement provides a hydraulic-electric series transmission HE gear between the input member and the output member; By adjusting the displacement ratio of the hydraulic transmission mechanism, the transmission ratio of the metal belt transmission mechanism and controlling the clutch C1, clutch C2, clutch C3, clutch C4, clutch C7, clutch C8, clutch C 11 、Clutch C 12 、Clutch C 13 、Clutch C 15 and brake B3 is engaged to provide HS2 gear of hydraulic-metal belt merge transmission between input member and output member; By adjusting the transmission ratio of the electric transmission mechanism and controlling the clutch C1, clutch C3, clutch C5, clutch C6, clutch C9, clutch C 10 、Clutch C 13 、Clutch C 14 、Clutch C 15 Engage with brake B4 to provide electric-gear convergence transmission EG gear between the input member and the output member; By adjusting the transmission ratio of the metal belt transmission mechanism and controlling the clutch C1, clutch C5, clutch C7, clutch C8, clutch C 13 、Clutch C 14 、Clutch C 15 , brake B3, brake B4 and brake B5 are engaged to provide the metal belt-gear split transmission SG gear between the input member and the output member; By adjusting the transmission ratio of the metal belt transmission mechanism, the transmission ratio of the electric transmission mechanism and controlling the clutch C1, clutch C5, clutch C7, clutch C8, clutch C9, clutch C 10 、Clutch C 12 、Clutch C 13 、Clutch C 14 Engage with brake B2 to provide metal belt-electrical split transmission SE gear between the input member and the output member.

5. The compound transmission device capable of realizing multi-path transmission and multi-mode switching according to claim 2, characterized in that: By adjusting the displacement ratio of the hydraulic transmission mechanism, the transmission ratio of the electric transmission mechanism and controlling the clutch C2, clutch C4, clutch C9, clutch C 10 、Clutch C 12 、Clutch C 13 、Clutch C 14 、Clutch C 15 and engaging brake B4 to provide a hydraulic-electric-gear series-parallel compound transmission HEG gear between the input member and the output member; By adjusting the displacement ratio of the hydraulic transmission mechanism, the transmission ratio of the metal belt transmission mechanism, the transmission ratio of the electric transmission mechanism and controlling the clutch C1, clutch C2, clutch C3, clutch C4, clutch C7, clutch C8, clutch C9, clutch C 10 、Clutch C 12 、Clutch C 13 and brake B2 is engaged to provide the hydraulic-metal belt-electric parallel compound transmission HSE1 gear between the input member and the output member; By adjusting the displacement ratio of the hydraulic transmission mechanism, the transmission ratio of the metal belt transmission mechanism, the transmission ratio of the electric transmission mechanism and controlling the clutch C2, clutch C3, clutch C4, clutch C5, clutch C7, clutch C8, clutch C9, clutch C 10 、Clutch C 12 、Clutch C 13 Engage with brake B2 to provide a hydraulic-metal belt-electric series-parallel compound transmission HSE2 gear between the input member and the output member.

6. The compound transmission device capable of realizing multi-path transmission and multi-mode switching according to claims 3-5, characterized in that: By adjusting the displacement ratio of the hydraulic transmission mechanism, the transmission ratio of the electric transmission mechanism and selectively controlling the engagement of the clutch assembly and the brake assembly, stepless speed switching of hydraulic single-flow transmission H gear → electric single-flow transmission E gear, and electric single-flow transmission E gear → hydraulic-electric series transmission HE gear can be provided.

7. The compound transmission device capable of realizing multi-path transmission and multi-mode switching according to claim 6, characterized in that: By adjusting the transmission ratio of the metal belt transmission mechanism, the transmission ratio of the electric transmission mechanism and selectively controlling the engagement of the clutch assembly and the brake assembly, stepless speed switching of metal belt single-flow transmission S gear → metal belt-gear split transmission SG gear, metal belt-gear split transmission SG gear → metal belt-electric split transmission SE gear can be provided.

8. The compound transmission device capable of realizing multi-path transmission and multi-mode switching according to claim 6, characterized in that: By adjusting the displacement ratio of the hydraulic transmission mechanism, the transmission ratio of the electric transmission mechanism and selectively controlling the engagement of the clutch assembly and the brake assembly, stepless speed switching can be provided: hydraulic single-flow transmission H gear → electric single-flow transmission E gear, electric single-flow transmission E gear → gear single-flow transmission G gear, gear single-flow transmission G gear → electric-gear convergence transmission EG gear, electric-gear convergence transmission EG gear → hydraulic-electric series transmission HE gear, hydraulic-electric series transmission HE gear → hydraulic-electric-gear series-parallel compound transmission HEG gear.

9. The compound transmission device capable of realizing multi-path transmission and multi-mode switching according to claim 6, characterized in that: By adjusting the displacement ratio of the hydraulic transmission mechanism, the transmission ratio of the metal belt transmission mechanism, the transmission ratio of the electric transmission mechanism and selectively controlling the engagement of the clutch assembly and the brake assembly, stepless speed switching can be provided: hydraulic single-flow transmission H gear → metal belt single-flow transmission S gear, metal belt single-flow transmission S gear → hydraulic-metal belt convergence transmission HS2 gear, hydraulic-metal belt convergence transmission HS2 gear → hydraulic-metal belt-electric parallel compound transmission HSE1 gear.

10. The compound transmission device capable of realizing multi-path transmission and multi-mode switching according to claim 6, characterized in that: By adjusting the displacement ratio of the hydraulic transmission mechanism, the transmission ratio of the metal belt transmission mechanism, the transmission ratio of the electric transmission mechanism and selectively controlling the engagement of the clutch assembly and the brake assembly, stepless speed switching can be provided: hydraulic single-flow transmission H gear → metal belt single-flow transmission S gear, metal belt single-flow transmission S gear → hydraulic-metal belt series transmission HS1 gear, hydraulic-metal belt series transmission HS1 gear → hydraulic-electric series transmission HE gear, hydraulic-electric series transmission HE gear → hydraulic-metal belt-electric series-parallel compound transmission HSE2 gear.

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