A hybrid power transmission device with a composite planetary gear train

Abstract

The application discloses a kind of oil-electricity hybrid composite planetary gear train power transmission device, including primary epicyclic planetary gear train, secondary fixed shaft planetary gear train, motor / generator assembly and remaining components.By controlling the working state of clutch II between primary planetary carrier and secondary sun gear, oil-driven, electric, oil-electricity hybrid power mode switching can be quickly completed, and according to the energy management recovery demand, the working state of clutch I at generator coil rotor can be controlled to realize the function of mechanical energy conversion into electrical energy.The oil-electricity hybrid composite planetary gear train power transmission device proposed in the application has the advantages of compact structure, high power density, energy management recovery convenience, etc.

Description

Technical Field

[0001] This invention relates to the field of power transmission systems, specifically a hybrid electric composite planetary gear system power transmission device. Background Technology

[0002] Hybrid power integrates two major power sources: internal combustion engine and electric drive. It has advantages such as energy consumption optimization and ease of use. Through regenerative braking and engine operating point adjustment, it significantly reduces fuel consumption, breaks through the range limitations and charging time constraints of pure electric vehicles, and has strong engineering practical value.

[0003] Currently, hybrid power systems can be categorized into series and parallel configurations. In a series configuration, the internal combustion engine acts solely as a range extender to drive a generator, with the power output entirely from the drive motor. Its advantages include simplified mechanical structure and easier-to-implement control strategies. However, its disadvantage lies in the long energy conversion chain—requiring two transformations: mechanical energy to electrical energy and back to mechanical energy—resulting in reduced system efficiency. In a parallel configuration, the internal combustion engine and motor can output power individually or in combination. Its advantages include rapid power response, outstanding acceleration performance, and direct drive by the internal combustion engine under high-speed steady-state conditions, avoiding energy conversion losses. However, this configuration involves complex mechanical coupling devices, making control system development more difficult. Furthermore, when the battery charge is insufficient, additional weight is required for the motor and battery.

[0004] Therefore, in order to meet the operating requirements of hybrid power systems, there is an urgent need in the existing technology for a power transmission device that is suitable for hybrid power systems, has a compact structure, high power density, and convenient energy management and recovery. Summary of the Invention

[0005] The purpose of this invention is to provide a hybrid power transmission device for oil and electricity, comprising a primary planetary gear train, a secondary fixed-axis planetary gear train, an electric motor / generator assembly, an intermediate shaft, a base, and a housing.

[0006] The motor / generator assembly includes a motor coil rotor, a motor permanent magnet stator, a generator coil rotor, and a generator permanent magnet stator.

[0007] The base and the housing are fixedly connected, together enclosing a transmission cavity. A permanent magnet stator for a motor and a permanent magnet stator for a generator are mounted on the inner wall of the transmission cavity. The intermediate shaft is a hollow shaft structure, supported by roller bearings I and II on a protruding cylindrical part of the base. The intermediate shaft is located within the transmission cavity, and a motor coil rotor and a generator coil rotor are mounted at corresponding positions on the outer circumference of the shaft. A clutch I is provided between the generator coil rotor and the intermediate shaft.

[0008] The primary planetary gear train and the secondary fixed-axis planetary gear train are coaxially arranged in the inner hole of the intermediate shaft, and the gear rings of the two planetary gear trains are fixed on the intermediate shaft and rotate synchronously with the intermediate shaft.

[0009] The second-stage fixed-axis planetary gear train includes a second-stage sun gear and second-stage planetary gears. The pins of the second-stage planetary gears are fixed to the base to limit their revolution. The second-stage sun gear is connected to the first-stage planet carrier of the first-stage planetary gear train via clutch II.

[0010] The primary planetary gear system includes a primary sun gear, primary planet gears, a primary planet carrier, an input shaft, and an output shaft. The input shaft and output shaft are located on opposite sides of the primary planet gears. One end of the input shaft is connected to the primary sun gear, and the other end passes through the inner bore of the secondary sun gear, extends from the base, and connects to an internal combustion engine located outside the transmission device. The output shaft is mounted on the pins of the primary planet gears and rotates synchronously with the pins of the primary planet gears.

[0011] Furthermore, the transmission device includes three operating modes: hydraulic mode, electric mode, and hybrid hydraulic-electric mode.

[0012] Furthermore, the first-stage planetary gear train includes a first-stage sun gear, first-stage planet gears, first-stage planetary gear bearings, first-stage planetary gear pins, first-stage internal gear ring, first-stage planetary carrier, input shaft, and output shaft.

[0013] The first-stage sun gear is located at the center of the entire first-stage planetary gear train and meshes externally with several first-stage planetary gears. These first-stage planetary gears are evenly distributed between the first-stage sun gear and the first-stage internal gear ring, meshing with both simultaneously. The first-stage planetary gears are mounted on first-stage planetary gear pins via first-stage planetary gear bearings. Both ends of the first-stage planetary gear pins are respectively assembled to the first-stage planetary carrier and the output shaft. The end of the output shaft furthest from the second-stage fixed-axis planetary gear train extends out of the housing.

[0014] Furthermore, the second-stage fixed-axis planetary gear train includes a second-stage sun gear, a second-stage planetary gear, a second-stage planetary gear bearing, a second-stage planetary gear pin, and a second-stage internal gear ring.

[0015] The secondary sun gear is located at the center of the entire secondary fixed-axis planetary gear train and meshes externally with several secondary planetary gears. These secondary planetary gears are evenly distributed between the secondary sun gear and the secondary internal gear ring, and mesh with both simultaneously. The secondary planetary gears are mounted on secondary planetary gear pins via secondary planetary gear bearings. One end of the secondary planetary gear pin is fixedly mounted to a base.

[0016] Furthermore, the clutch I is a wet multi-plate clutch, including an external spline, friction plates, steel plates, a clutch outer hub, an annular piston, a spring, and an oil passage, all disposed on the outer circle of the central shaft.

[0017] The clutch outer hub is coaxially sleeved on the outer circle of the central shaft, forming a cavity with the outer circle of the central shaft. Several friction plates and several steel plates are arranged alternately along the axial direction within the cavity and sleeved on the outer circle of the central shaft to form a friction plate assembly.

[0018] The friction plate has an internal spline in its inner hole and is fitted onto the external spline of the central shaft, rotating synchronously with the central shaft. The outer circumference of the steel plate has an external spline, and a matching internal spline groove is formed on the inner side of the clutch outer hub. The steel plate is engaged and assembled inside the clutch outer hub by the external spline on its outer circumference. The generator coil rotor is fixed on the clutch outer hub, ensuring that the steel plate and the generator coil rotor move synchronously.

[0019] The spring is disposed between the friction plate assembly and the annular piston. An annular retaining ring is provided on the outer hub of the clutch, and the two ends of the spring are fixed to the annular retaining ring and the annular piston.

[0020] The annular piston is a stepped piston, coaxially sleeved on the outer circle of the central shaft, and can slide back and forth along the central shaft axial direction. The cavity and the annular piston at the end face opposite to the friction plate assembly form an annular oil chamber.

[0021] An annular oil groove is machined on the end face of the base, and the groove communicates with the oil passage I inside the base. An oil passage II is provided inside the central shaft, and the two ends of the oil passage II are respectively connected to the annular oil groove and the annular oil cavity.

[0022] In both hydraulic and hybrid hydraulic modes, hydraulic oil enters the annular oil chamber through oil passage I, annular oil groove, and oil passage II, pushing the annular piston towards the friction plate assembly. This causes the outer ring of the piston to press against the spring, and the inner ring of the piston to press against the friction plate and steel plate, thereby causing the central shaft to drive the clutch outer hub and the generator coil rotor to rotate synchronously.

[0023] In electric mode, the hydraulic oil is released, the pressure in the annular oil chamber decreases, the spring pushes the annular piston to move away from the friction plate assembly, the friction plates and steel plates are released, the friction connection between the central shaft and the clutch outer hub is broken, and the generator coil rotor no longer rotates synchronously with the central shaft.

[0024] Furthermore, a rotary sealing structure is installed at the connection point between the base and the input shaft, and at the location where the base is provided with an annular oil cavity.

[0025] Furthermore, the clutch II is a jaw clutch, including a sliding toothed sleeve, a shift fork, a shift fork shaft, and an actuator.

[0026] The inner bore of the first-stage planetary carrier is machined with internal teeth.

[0027] The sliding toothed sleeve is a hollow cylindrical structure with splines machined in the inner hole. It is fitted onto the axle of the secondary sun gear and rotates synchronously with the secondary sun gear. It can also slide along the axial direction of the secondary sun gear.

[0028] The outer circumference of the sliding gear sleeve is machined with external teeth, which are adapted to the internal teeth of the inner hole of the first-stage planetary carrier.

[0029] An annular shift fork groove is also machined on the outer circumference of the sliding tooth sleeve, and the fork of the shift fork engages in the annular shift fork groove. The shift fork is connected to the shift fork shaft, which passes through the gear ring and base of the secondary fixed-axis planetary gear train and is connected to the actuator located outside the transmission device.

[0030] When the first-stage planetary carrier is connected to the sun gear, the external actuator pushes the shift fork shaft, which causes the shift fork to drive the sliding sleeve to slide towards the first-stage planetary carrier and engage with it, thus completing the connection.

[0031] When the first-stage planetary carrier separates from the sun gear, the external actuator pushes the shift fork shaft in the opposite direction, causing the shift fork to slide the sliding sleeve away from the first-stage planetary carrier, thus disengaging the sliding sleeve from the inner teeth of the first-stage planetary carrier and completing the separation.

[0032] Furthermore, when the power planetary transmission is in hydraulic mode, the input shaft is connected to the internal combustion engine, the electric motor stops working, and clutch II is engaged, connecting the first-stage planetary carrier to the second-stage sun gear. At this time, the power transmission system is a hybrid planetary gear system, with the internal combustion engine independently supplying power to the system.

[0033] Furthermore, when the power planetary transmission is in electric mode, the input shaft is disconnected from the internal combustion engine, the electric motor works independently, and clutch II is engaged to connect the first-stage planetary carrier with the second-stage sun gear. At this time, the power transmission system is a hybrid planetary gear system, and the electric motor independently supplies power to the system.

[0034] Furthermore, when the power planetary transmission device is in hybrid mode, the input shaft is connected to the internal combustion engine, the electric motor works, clutch II is disengaged, the first-stage planetary carrier and the second-stage sun gear maintain their independent motion, and the power transmission system is a planetary gear train, with the electric motor and the internal combustion engine jointly supplying power to the transmission system.

[0035] The technical effects of this invention are undeniable, and its beneficial effects are as follows:

[0036] 1) The hybrid planetary transmission device proposed in this invention can quickly switch between oil-powered, electric, and hybrid oil-electric modes according to usage requirements, and has the advantages of high energy utilization.

[0037] 2) The power transmission system is composed of a planetary gear train and a fixed-axis planetary gear train. The motor / generator assembly is integrated on the housing and the transmission shaft, resulting in a compact system structure and high power density.

[0038] 3) By controlling the connection or disconnection of the coupling, the generator's operating status can be quickly adjusted, facilitating system energy management and recovery. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0040] Figure 2 This is an exploded view of the present invention;

[0041] Figure 3 This is a schematic diagram of a first-stage planetary gear train.

[0042] Figure 4 This is a schematic diagram of a two-stage fixed-axis planetary gear train;

[0043] Figure 5 Schematic diagram of the motor / generator assembly;

[0044] Figure 6 A schematic diagram of the remaining components;

[0045] Figure 7 This is a schematic diagram of the connection between the first and second stage planetary gear trains;

[0046] Figure 8 A schematic diagram for assembling the remaining components;

[0047] Figure 9 This is a schematic diagram of the power transmission path in hydraulic mode;

[0048] Figure 10 This is a schematic diagram of the power transfer path in electric mode;

[0049] Figure 11 This is a schematic diagram of the power transmission path in hybrid electric power mode.

[0050] In the diagram: First-stage planetary gear train 1, Second-stage fixed-axis planetary gear train 2, Motor / generator assembly 3, Other components 4, First-stage sun gear 101, First-stage planetary gear 102, First-stage planetary gear bearing 103, First-stage planetary gear pin 104, First-stage internal gear ring 105, First-stage planetary carrier 106, Input shaft 107, Output shaft 108, Second-stage sun gear 201, Second-stage planetary gear 202, Second-stage planetary gear bearing 203, Second-stage planetary gear pin 204, Second-stage internal gear ring 205, Motor coil rotor 301, Motor permanent magnet stator 302, Generator coil rotor 303, Generator permanent magnet stator 304, Intermediate shaft 305, Clutch I 306, Base 401, Roller bearing I 402, Sleeve I 403, Sleeve II 404, Roller bearing II 405, Nut 406, Clutch II 407, Housing 408. Detailed Implementation

[0051] The present invention will be further described below with reference to embodiments, but it should not be construed that the scope of the present invention is limited to the following embodiments. Various substitutions and modifications made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention should be included within the scope of protection of the present invention.

[0052] Example 1:

[0053] A hybrid electric power transmission device with a composite planetary gear system includes a primary planetary gear system 1, a secondary fixed-axis planetary gear system 2, an electric motor / generator assembly 3, an intermediate shaft 305, a base 401, and a housing 408.

[0054] The motor / generator assembly 3 includes a motor coil rotor 301, a motor permanent magnet stator 302, a generator coil rotor 303, and a generator permanent magnet stator 304.

[0055] The base 401 and the housing 408 are fixedly connected, together forming a transmission cavity. A permanent magnet stator 302 for a motor and a permanent magnet stator 304 for a generator are mounted on the inner wall of the transmission cavity. The intermediate shaft 305 is a hollow shaft structure, supported by roller bearings I 402 and II 405 on a protruding cylindrical part of the base 401. The intermediate shaft 305 is located within the transmission cavity, and a motor coil rotor 301 and a generator coil rotor 303 are mounted at corresponding positions on the outer circumference of the shaft. A clutch I 306 is provided between the generator coil rotor 303 and the intermediate shaft 305.

[0056] The primary planetary gear train 1 and the secondary fixed-axis planetary gear train 2 are coaxially arranged in the inner hole of the intermediate shaft 305, and the gear rings of the two planetary gear trains are fixed on the intermediate shaft 305 and rotate synchronously with the intermediate shaft 305.

[0057] The second-stage fixed-axis planetary gear train 2 includes a second-stage sun gear 201 and a second-stage planetary gear 202. The pin of the second-stage planetary gear 202 is fixed to the base 401 to limit the revolution of the second-stage planetary gear 202. The second-stage sun gear 201 is connected to the first-stage planet carrier 106 of the first-stage planetary gear train 1 via a clutch II 407.

[0058] The first-stage planetary gear train 1 includes a first-stage sun gear 101, first-stage planet gears 102, a first-stage planet carrier 106, an input shaft 107, and an output shaft 108. The input shaft 107 and output shaft 108 are located on opposite sides of the first-stage planet gear 102. One end of the input shaft 107 is connected to the first-stage sun gear 101, and the other end passes through the inner hole of the second-stage sun gear 201, extends from the base 401, and connects to an internal combustion engine located outside the transmission device. The output shaft 108 is mounted on the pin of the first-stage planet gear 102 and rotates synchronously with the pin of the first-stage planet gear 102.

[0059] Example 2:

[0060] The main structure of this embodiment is the same as that of Embodiment 1. Furthermore, the transmission device includes three working modes: oil-powered mode, electric mode, and hybrid oil-electric mode.

[0061] Example 3:

[0062] The main structure of this embodiment is the same as any one of embodiments 1 to 2. Further, the first-stage planetary gear train 1 includes a first-stage sun gear 101, a first-stage planet gear 102, a first-stage planetary gear bearing 103, a first-stage planetary gear pin 104, a first-stage internal gear ring 105, a first-stage planetary carrier 106, an input shaft 107, and an output shaft 108.

[0063] The first-stage sun gear 101 is located at the center of the entire first-stage planetary gear train 1 and meshes externally with several first-stage planetary gears 102. These first-stage planetary gears 102 are evenly arranged between the first-stage sun gear 101 and the first-stage internal gear ring 105, and mesh with both the first-stage sun gear 101 and the first-stage internal gear ring 105 simultaneously. The first-stage planetary gears 102 are mounted on the first-stage planetary gear pins 104 via first-stage planetary gear bearings 103. Both ends of the first-stage planetary gear pins 104 are respectively assembled to the first-stage planetary carrier 106 and the output shaft 108. The end of the output shaft 108 furthest from the second-stage fixed-axis planetary gear train 2 extends out of the housing 408.

[0064] Example 4:

[0065] The main structure of this embodiment is the same as any one of embodiments 1 to 3. Further, the secondary fixed-axis planetary gear train 2 includes a secondary sun gear 201, a secondary planetary gear 202, a secondary planetary gear bearing 203, a secondary planetary gear pin 204, and a secondary internal gear ring 205.

[0066] The secondary sun gear 201 is located at the center of the entire secondary fixed-axis planetary gear train 2 and meshes externally with several secondary planetary gears 202. The several secondary planetary gears 202 are evenly arranged between the secondary sun gear 201 and the secondary internal gear ring 205, and mesh with both the secondary sun gear 201 and the secondary internal gear ring 205 simultaneously. The secondary planetary gears 202 are mounted on the secondary planetary gear pin 204 via secondary planetary gear bearings 203. One end of the secondary planetary gear pin 204 is fixedly mounted on the base 401.

[0067] Example 5:

[0068] The main structure of this embodiment is the same as any one of embodiments 1 to 4. Furthermore, the clutch I306 is a wet multi-plate clutch, including an external spline, friction plates, steel plates, clutch outer hub, annular piston, spring and oil passage, which are arranged on the outer circle of the central shaft 305.

[0069] The clutch outer hub is coaxially sleeved on the outer circle of the central shaft 305, forming a cavity with the outer circle of the central shaft 305. Several friction plates and several steel plates are arranged alternately along the axial direction in the cavity and sleeved on the outer circle of the central shaft 305 to form a friction plate assembly.

[0070] The friction plate has an internal spline in its inner hole and is fitted onto the external spline of the central shaft, rotating synchronously with the central shaft. The outer circumference of the steel plate has an external spline, and a matching internal spline groove is formed on the inner side of the clutch outer hub. The steel plate is engaged and assembled into the clutch outer hub by the external spline on its outer circumference. The generator coil rotor 303 is fixed to the clutch outer hub, ensuring that the steel plate and the generator coil rotor 303 move synchronously.

[0071] The spring is disposed between the friction plate assembly and the annular piston. An annular retaining ring is provided on the outer hub of the clutch, and the two ends of the spring are fixed to the annular retaining ring and the annular piston.

[0072] The annular piston is a stepped piston, coaxially sleeved on the outer circle of the central shaft 305, and can slide back and forth along the axial direction of the central shaft 305. The cavity and the annular piston form an annular oil chamber at one end face away from the friction plate assembly.

[0073] An annular oil groove is machined on the end face of the base 401, and the groove communicates with the oil passage I inside the base 401. An oil passage II is provided inside the central shaft 305, and the two ends of the oil passage II are respectively connected to the annular oil groove and the annular oil cavity.

[0074] In both hydraulic and hybrid hydraulic modes, hydraulic oil enters the annular oil chamber via oil passage I, annular oil groove, and oil passage II, pushing the annular piston towards the friction plate assembly. This causes the outer ring of the piston to press against the spring, and the inner ring of the piston to press against the friction plate and steel plate. Since the friction plate is connected to the central shaft and the steel plate is connected to the clutch outer hub, the friction generated after the friction plate and steel plate are pressed together causes the central shaft 305 to drive the clutch outer hub and the generator coil rotor 303 to rotate synchronously.

[0075] In electric mode, the hydraulic oil is released, the pressure in the annular oil chamber decreases, the spring pushes the annular piston to move away from the friction plate assembly, the friction plates and steel plates are released, the friction connection between the central shaft 305 and the clutch outer hub is broken, and the generator coil rotor 303 no longer rotates synchronously with the central shaft 305.

[0076] Example 6:

[0077] The main structure of this embodiment is the same as any one of embodiments 1 to 5. Furthermore, a rotary sealing structure is installed at the connection position between the base 40 and the input shaft 107, and at the position where the annular oil cavity is set on the base 401.

[0078] Example 7:

[0079] The main structure of this embodiment is the same as any one of embodiments 1 to 6. Furthermore, the clutch II407 is a dog clutch, including a sliding toothed sleeve, a shift fork, a shift fork shaft, and an actuator.

[0080] The inner bore of the primary planetary carrier 106 is machined with internal teeth.

[0081] The sliding toothed sleeve is a hollow cylindrical structure with splines machined in the inner hole. It is fitted onto the axle of the secondary sun gear 201 and rotates synchronously with the secondary sun gear 201. It can also slide along the axial direction of the secondary sun gear 201.

[0082] The outer circle of the sliding tooth sleeve is machined with external teeth, which are adapted to the internal teeth of the inner hole of the first-stage planetary carrier 106.

[0083] An annular shift fork groove is also machined on the outer circumference of the sliding tooth sleeve, and the fork of the shift fork engages in the annular shift fork groove. The shift fork is connected to the shift fork shaft, which passes through the gear ring of the secondary fixed-axis planetary gear train 2 and the base 401, and is connected to the actuator located outside the transmission device.

[0084] When the first-stage planetary carrier 106 is connected to the sun gear 201, the external actuator pushes the shift fork shaft, which causes the shift fork to drive the sliding sleeve to slide towards the first-stage planetary carrier 106 and engage in the first-stage planetary carrier 106, thus completing the connection.

[0085] When the first-stage planetary carrier 106 separates from the sun gear 201, the external actuator pushes the shift fork shaft in the opposite direction, causing the shift fork to drive the sliding sleeve to slide away from the first-stage planetary carrier 106, so that the sliding sleeve disengages from the internal teeth of the first-stage planetary carrier 106, thus completing the separation.

[0086] Example 8:

[0087] The main structure of this embodiment is the same as any one of embodiments 1 to 7. Furthermore, when the power planetary transmission device is in hydraulic mode, the input shaft 107 is connected to the internal combustion engine, the electric motor stops working, and the clutch II 407 is engaged, connecting the first-stage planetary carrier 106 to the second-stage sun gear 201. At this time, the power transmission system is a hybrid planetary gear system, with the internal combustion engine independently supplying power to the system. Power is transmitted from the input shaft 107 to the first-stage sun gear 101, then to the first-stage planetary gear 102, driving the first-stage planetary gear pin shaft 104 and the first-stage planetary carrier 106 to rotate, and finally transmitted to the output shaft 108.

[0088] Example 9:

[0089] The main structure of this embodiment is the same as any one of embodiments 1 to 8. Furthermore, when the power planetary transmission device is in electric mode, the input shaft 107 is disconnected from the internal combustion engine, the electric motor works independently, and the clutch II 407 is engaged to connect the first-stage planetary carrier 106 with the second-stage sun gear 201. At this time, the power transmission system is a hybrid planetary gear system, and the electric motor independently inputs power to the system. Part of the power is transmitted from the first-stage internal gear ring 105 to the first-stage planetary gear 102, and then to the output shaft 108. The other part is transmitted from the second-stage internal gear ring 205 to the second-stage planetary gear 202, then to the second-stage sun gear 201, and then to the output shaft 108.

[0090] Example 10:

[0091] The main structure of this embodiment is the same as any one of embodiments 1 to 9. Furthermore, when the power planetary transmission device is in hybrid mode, the input shaft 107 is connected to the internal combustion engine, the electric motor works, the clutch II 407 is disengaged, the first-stage planetary carrier 106 and the second-stage sun gear 201 maintain their independent motion, and the power transmission system is a planetary gear train. The electric motor and the internal combustion engine jointly input power to the transmission system. The power of the electric motor is transmitted from the first-stage internal gear ring 105 to the first-stage planetary gear 102, and then to the output shaft 108. The power of the internal combustion engine is transmitted from the input shaft 107 to the first-stage sun gear 101, then to the first-stage planetary gear 102, and then to the output shaft 108.

[0092] Example 11:

[0093] The main structure of this embodiment is the same as any one of embodiments 1 to 10, and further includes a first-stage planetary gear train 1, a second-stage fixed-axis planetary gear train 2, a motor / generator assembly 3, and other components 4.

[0094] The first-stage planetary gear train 1 includes a first-stage sun gear 101, a first-stage planet gear 102, a first-stage planetary gear bearing 103, a first-stage planetary gear pin 104, a first-stage internal gear ring 105, a first-stage planetary carrier 106, an input shaft 107, and an output shaft 108.

[0095] The second-stage fixed-axis planetary gear train 2 includes a second-stage sun gear 201, a second-stage planetary gear 202, a second-stage planetary gear bearing 203, a second-stage planetary gear pin 204, and a second-stage internal gear ring 205.

[0096] The motor / generator assembly 3 includes a motor coil rotor 301, a motor permanent magnet stator 302, a generator coil rotor 303, a generator permanent magnet stator 304, an intermediate shaft 305, and a clutch I 306.

[0097] The remaining components 4 include a base 401, roller bearing I 402, sleeve I 403, sleeve II 404, roller bearing II 405, nut 406, clutch II 407, and housing 408.

[0098] The intermediate shaft 305 is supported on the protruding cylinder of the base 401 by roller bearings I402 and II405, which facilitates the rotation of the intermediate shaft 305. At the same time, sleeve I403 axially limits the outer rings of roller bearings I402 and II405, and sleeve II404 axially limits the inner rings of roller bearings I402 and II405. Nut 406 is screwed into the thread on the protruding cylinder of the base 401 to complete the axial positioning of roller bearings I402, sleeve I403, sleeve II404, and roller bearing II405.

[0099] The permanent magnet stator 302 of the electric motor and the permanent magnet stator 304 of the generator are installed in the housing 408; the first-stage internal gear ring 105 and the second-stage internal gear ring 205 are installed in the inner hole of the intermediate shaft 305, and the motor coil rotor 301 and the clutch I306 are installed on the outer circle of the intermediate shaft 305, and the five of them rotate synchronously together; the first-stage planetary gear pin 104, the first-stage planetary carrier 106, and the output shaft 108 are installed together, and the three rotate synchronously; the second-stage planetary gear pin 204 is installed in the corresponding shaft hole of the base 401 and is fixed to the base 401.

[0100] The first-stage planetary carrier 106 is connected to the second-stage sun gear 201 via clutch II407. By controlling the engagement or disengagement of clutch II407, it is determined whether the first-stage planetary carrier 106 and the second-stage sun gear 201 move at the same speed or independently.

[0101] In all three modes, all gears will rotate, and the first-stage planetary carrier will rotate. When clutch II407 is engaged, the entire transmission system requires only one power source. When clutch II407 is disengaged, the entire transmission system requires two power sources.

Claims

1. A hybrid electric power transmission device with a composite planetary gear system, characterized in that: It includes a primary planetary gear train (1), a secondary fixed-axis planetary gear train (2), an electric motor / generator assembly (3), an intermediate shaft (305), a base (401), and a housing (408). The motor / generator assembly (3) includes a motor coil rotor (301), a motor permanent magnet stator (302), a generator coil rotor (303), and a generator permanent magnet stator (304). The base (401) and the housing (408) are fixedly connected, and together they enclose a transmission cavity; a permanent magnet stator (302) for a motor and a permanent magnet stator (304) for a generator are mounted on the inner wall of the transmission cavity; the intermediate shaft (305) is a hollow shaft structure, supported on the protruding cylindrical part of the base (401) by roller bearings I (402) and II (405); the intermediate shaft (305) is located in the transmission cavity, and a motor coil rotor (301) and a generator coil rotor (303) are mounted at corresponding positions on the outer circle of the shaft; a clutch I (306) is provided between the generator coil rotor (303) and the intermediate shaft (305). The first-stage planetary gear train (1) and the second-stage fixed-axis planetary gear train (2) are coaxially arranged in the inner hole of the intermediate shaft (305), and the gear rings of the two planetary gear trains are fixed on the intermediate shaft (305) and rotate synchronously with the intermediate shaft (305); The second-stage fixed-axis planetary gear train (2) includes a second-stage sun gear (201) and a second-stage planetary gear (202); the pin of the second-stage planetary gear (202) is fixed on the base (401) to limit the revolution of the second-stage planetary gear (202); the second-stage sun gear (201) is connected to the first-stage planet carrier (106) of the first-stage planetary gear train (1) via clutch II (407); The first-stage planetary gear train (1) includes a first-stage sun gear (101), a first-stage planetary gear (102), a first-stage planet carrier (106), an input shaft (107), and an output shaft (108). The input shaft (107) and the output shaft (108) are respectively located on both sides of the first-stage planetary gear (102). One end of the input shaft (107) is connected to the first-stage sun gear (101), and the other end passes through the inner hole of the second-stage sun gear (201), extends out from the base (401), and is connected to the internal combustion engine located outside the transmission device. The output shaft (108) is mounted on the pin of the first-stage planetary gear (102) and rotates synchronously with the pin of the first-stage planetary gear (102).

2. The hybrid planetary gear system power transmission device for oil and electricity as described in claim 1, characterized in that: The transmission device includes three operating modes: hydraulic mode, electric mode, and hybrid hydraulic-electric mode.

3. The hybrid planetary gear system power transmission device for oil and electricity as described in claim 1, characterized in that: The first-stage planetary gear train (1) includes a first-stage sun gear (101), a first-stage planetary gear (102), a first-stage planetary gear bearing (103), a first-stage planetary gear pin (104), a first-stage internal gear ring (105), a first-stage planetary carrier (106), an input shaft (107), and an output shaft (108). The first-stage sun gear (101) is located at the center of the entire first-stage planetary gear system (1) and meshes with several first-stage planetary gears (102). Several first-stage planetary gears (102) are evenly arranged between the first-stage sun gear (101) and the first-stage internal gear ring (105), and mesh with the first-stage sun gear (101) and the first-stage internal gear ring (105) at the same time. The first-stage planetary gears (102) are mounted on the first-stage planetary gear pin (104) via the first-stage planetary gear bearing (103). The two ends of the first-stage planetary gear pin (104) are respectively assembled with the first-stage planetary carrier (106) and the output shaft (108). The end of the output shaft (108) away from the second-stage fixed-axis planetary gear system (2) extends out of the housing (408).

4. The hybrid planetary gear system power transmission device for oil and electricity as described in claim 1, characterized in that: The second-stage fixed-axis planetary gear train (2) includes a second-stage sun gear (201), a second-stage planetary gear (202), a second-stage planetary gear bearing (203), a second-stage planetary gear pin (204), and a second-stage internal gear ring (205). The secondary sun gear (201) is located at the center of the entire secondary fixed-axis planetary gear system (2) and meshes externally with several secondary planetary gears (202); several secondary planetary gears (202) are evenly arranged between the secondary sun gear (201) and the secondary internal gear ring (205), and mesh with the secondary sun gear (201) and the secondary internal gear ring (205) at the same time; the secondary planetary gears (202) are mounted on the secondary planetary gear pin (204) via the secondary planetary gear bearing (203); one end of the secondary planetary gear pin (204) is fixedly mounted on the base (401).

5. The hybrid planetary gear system power transmission device for oil and electricity as described in claim 1, characterized in that: The clutch I (306) is a wet multi-plate clutch, including an external spline, friction plates, steel plates, clutch hub, annular piston, spring and oil passage, which are disposed on the outer circle of the central shaft (305); The outer hub of the clutch is coaxially sleeved on the outer circle of the central shaft (305), forming a cavity with the outer circle of the central shaft (305); a number of friction plates and a number of steel plates are arranged in the cavity and alternately along the axial direction, and are sleeved on the outer circle of the central shaft (305) to form a friction plate group; The friction plate has an internal spline in its inner hole and is fitted onto the external spline of the central shaft, rotating synchronously with the central shaft; the steel plate has an external spline on its outer circle and a matching internal spline groove is opened on the inner side of the clutch outer hub; the steel plate is fitted into the clutch outer hub by the external spline on its outer periphery; the generator coil rotor (303) is fixed on the clutch outer hub, so that the steel plate and the generator coil rotor (303) move synchronously. The spring is disposed between the friction plate assembly and the annular piston; the outer hub of the clutch is provided with an annular retaining ring, and the two ends of the spring are fixed to the annular retaining ring and the annular piston; The annular piston is a stepped piston, coaxially sleeved on the outer circle of the central shaft (305), and can slide back and forth along the central shaft (305) axial direction; the cavity and the annular piston are sandwiched at one end face away from the friction plate assembly to form an annular oil cavity; An annular oil groove is machined on the end face of the base (401), and the groove communicates with the oil passage I inside the base (401); an oil passage II is provided in the central shaft (305), and the two ends of the oil passage II are respectively connected to the annular oil groove and the annular oil cavity. In both hydraulic and hybrid hydraulic modes, hydraulic oil enters the annular oil chamber through oil passage I, annular oil groove, and oil passage II, pushing the annular piston towards the friction plate assembly. This causes the outer ring of the piston to press against the spring, and the inner ring of the piston to press against the friction plate and steel plate, so that the central shaft (305) drives the clutch outer hub and the generator coil rotor (303) to rotate synchronously. In electric mode, the hydraulic oil is drained, the pressure in the annular oil chamber decreases, the spring pushes the annular piston to move away from the friction plate assembly, the friction plates and steel plates are released, the friction connection between the central shaft (305) and the clutch outer hub is broken, and the generator coil rotor (303) no longer rotates synchronously with the central shaft (305).

6. The hybrid planetary gear system power transmission device for oil and electricity as described in claim 5, characterized in that: Rotary sealing structures are installed at the connection points between the base (401) and the input shaft (107), as well as at the locations where the base (401) has an annular oil cavity.

7. The hybrid planetary gear system power transmission device for oil and electricity as described in claim 1, characterized in that: The clutch II (407) is a dog clutch, including a sliding toothed sleeve, a shift fork, a shift fork shaft and an actuator; The inner bore of the primary planetary carrier (106) is machined with internal teeth; The sliding toothed sleeve is a hollow cylindrical structure with splines machined in the inner hole. It is fitted onto the axle of the secondary sun gear (201) and rotates synchronously with the secondary sun gear (201). It can also slide along the axial direction of the secondary sun gear (201). The outer circle of the sliding tooth sleeve is machined with external teeth, which are adapted to the internal teeth of the inner hole of the first-stage planetary carrier (106); The outer circle of the sliding tooth sleeve is also machined with an annular fork groove, and the fork of the fork engages in the annular fork groove; the fork is connected to the fork shaft, and the fork shaft passes through the gear ring and the base (401) of the secondary fixed-axis planetary gear train (2) and is connected to the actuator located outside the transmission device; When the first-stage planetary carrier (106) is connected to the sun gear (201), the external actuator pushes the shift fork shaft, thereby causing the shift fork to drive the sliding sleeve to slide towards the first-stage planetary carrier (106) and engage in the first-stage planetary carrier (106) to complete the connection; When the primary planetary carrier (106) separates from the sun gear (201), the external actuator pushes the shift fork shaft in the opposite direction, causing the shift fork to drive the sliding sleeve to slide away from the primary planetary carrier (106), so that the sliding sleeve disengages from the internal teeth of the primary planetary carrier (106), thus completing the separation.

8. The hybrid planetary gear system power transmission device for oil and electricity as described in claim 1, characterized in that: When the power planetary transmission is in hydraulic mode, the input shaft (107) is connected to the internal combustion engine, the electric motor stops working, and the clutch II (407) is engaged so that the first-stage planetary carrier (106) is connected to the second-stage sun gear (201). At this time, the power transmission system is a hybrid planetary gear system, and the internal combustion engine independently supplies power to the system.

9. A hybrid electric composite planetary gear system power transmission device according to claim 1, characterized in that: When the power planetary transmission is in electric mode, the input shaft (107) is disconnected from the internal combustion engine, the electric motor works independently, and the clutch II (407) is engaged to connect the first-stage planetary carrier (106) with the second-stage sun gear (201). At this time, the power transmission system is a hybrid planetary gear system, and the electric motor independently supplies power to the system.

10. A hybrid electric composite planetary gear system power transmission device according to claim 1, characterized in that: When the power planetary transmission device is in hybrid mode, the input shaft (107) is connected to the internal combustion engine, the electric motor works, the clutch II (407) is disengaged, the first-stage planetary carrier (106) and the second-stage sun gear (201) maintain their independent motion, the power transmission system is a planetary gear train, and the electric motor and the internal combustion engine jointly input power to the transmission system.

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