CN113090731A - Multi-power flow composite stepless transmission device - Google Patents
Multi-power flow composite stepless transmission device Download PDFInfo
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- CN113090731A CN113090731A CN202110307148.XA CN202110307148A CN113090731A CN 113090731 A CN113090731 A CN 113090731A CN 202110307148 A CN202110307148 A CN 202110307148A CN 113090731 A CN113090731 A CN 113090731A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 75
- 239000002131 composite material Substances 0.000 title claims abstract description 10
- 230000007246 mechanism Effects 0.000 claims abstract description 82
- 230000001105 regulatory effect Effects 0.000 claims abstract description 8
- 239000003921 oil Substances 0.000 claims description 8
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 239000010687 lubricating oil Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 7
- 239000000203 mixture Substances 0.000 abstract 1
- 150000001875 compounds Chemical class 0.000 description 5
- 239000000446 fuel Substances 0.000 description 4
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H47/00—Combinations of mechanical gearing with fluid clutches or fluid gearing
- F16H47/06—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the hydrokinetic type
- F16H47/08—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the hydrokinetic type the mechanical gearing being of the type with members having orbital motion
- F16H47/10—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the hydrokinetic type the mechanical gearing being of the type with members having orbital motion using two or more power-transmitting fluid circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/08—General details of gearing of gearings with members having orbital motion
- F16H57/082—Planet carriers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/66—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H2200/00—Transmissions for multiple ratios
- F16H2200/20—Transmissions using gears with orbital motion
- F16H2200/2002—Transmissions using gears with orbital motion characterised by the number of sets of orbital gears
- F16H2200/2007—Transmissions using gears with orbital motion characterised by the number of sets of orbital gears with two sets of orbital gears
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H2200/00—Transmissions for multiple ratios
- F16H2200/20—Transmissions using gears with orbital motion
- F16H2200/203—Transmissions using gears with orbital motion characterised by the engaging friction means not of the freewheel type, e.g. friction clutches or brakes
- F16H2200/2043—Transmissions using gears with orbital motion characterised by the engaging friction means not of the freewheel type, e.g. friction clutches or brakes with five engaging means
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
The invention discloses a multi-power flow composite stepless transmission device, which comprises a hydraulic speed regulating circuit, a branch and confluence planetary mechanism, a fixed shaft gear transmission mechanism, a section changing mechanism and an auxiliary system, wherein the branch and confluence planetary mechanism is connected with the fixed shaft gear transmission mechanism; the split-confluence planetary mechanism realizes the split and confluence of hydraulic power and mechanical power; the section changing mechanism comprises a first clutch, a second clutch, a first synchronizer and a second synchronizer; the auxiliary system comprises a first gear pump and a second gear pump; the stepless transmission device can realize a first section for a starting working condition, a second section for a low-speed working condition, a third section for a high-speed driving working condition and a reversing section for a reversing working condition; the first synchronizer and the second synchronizer are sleeved on the output shaft in a hollow mode. The stepless transmission device can realize high-efficiency transmission and stepless speed change through power composition of machinery and hydraulic pressure, can improve the working efficiency and ensure the continuous output of power.
Description
Technical Field
The invention relates to the technical field of power transmission of non-road vehicles such as tractors and the like, in particular to a multi-power flow composite stepless transmission device.
Background
At present, non-road vehicles such as tractors and the like generally adopt a manual gearbox for speed change operation. Due to the operation requirement, the vehicle speed and the engine load change violently, gears need to be switched frequently, the requirements of different operation vehicle speeds and traction forces are met, and the operation workload is increased. Meanwhile, when the tractor works, a large load needs to be pulled, and the manual gearbox easily causes power interruption, so that the working efficiency is influenced.
Disclosure of Invention
In view of this, the invention provides a multi-power flow compound stepless transmission device, which can realize high-efficiency transmission and stepless speed change through power combination of machinery and hydraulic pressure, improve the working efficiency and ensure continuous output of power.
The invention adopts the following specific technical scheme:
a multi-power flow composite stepless transmission device comprises an input shaft, an output shaft, a hydraulic speed regulation loop, a branch and confluence planetary mechanism, a fixed shaft gear transmission mechanism, a section changing mechanism and an auxiliary system;
the hydraulic speed regulating loop is used for connecting an engine and comprises a hydraulic pump and a hydraulic motor; the hydraulic pump and the hydraulic motor are connected through a high-pressure oil way to form a closed hydraulic loop;
the splitting and converging planetary mechanism is an external-meshing double-star-row, comprises a first sun gear, a second sun gear, a planet carrier, a first gear ring and a second gear ring, and is used for splitting and converging hydraulic power and mechanical power;
the fixed shaft gear transmission mechanism comprises a first gear, a second gear, a third gear, a fourth gear, a fifth gear, a sixth gear, a seventh gear, an eighth gear, a ninth gear, a tenth gear and an eleventh gear;
the section changing mechanism comprises a first clutch, a second clutch, a first synchronizer and a second synchronizer; the first clutch and the second clutch are used for power-interrupt-free switching;
the auxiliary system comprises a first gear pump and a second gear pump; the first gear pump is communicated with the closed hydraulic circuit and is used for maintaining the pressure of the closed hydraulic circuit; the second gear pump provides control oil pressure for the hydraulic pump and the hydraulic motor and provides lubricating oil for the section changing mechanism;
the stepless transmission device can realize a first section for a starting working condition, a second section for a low-speed working condition, a third section for a high-speed driving working condition and a reversing section for a reversing working condition; the first section, the second section, the third section and the reversing section are all hydraulic mechanical sections;
one end of the input shaft is used for connecting the engine, and the other end of the input shaft penetrates through the hydraulic pump and then is connected with the ninth gear;
the first gear is connected with the first gear ring and is sleeved on the motor output shaft in an empty mode; the first gear is meshed with the ninth gear;
the first sun gear is connected with a motor output shaft of the hydraulic motor and is meshed with the first gear ring through one end of the planet carrier, and the other end of the planet carrier is meshed with the second sun gear and the second gear ring; the second sun gear is connected with the tenth gear;
the second ring gear is connected with the seventh gear, the fifth gear and the second gear;
the first synchronizer and the second synchronizer are sleeved on the output shaft in a hollow manner; two ends of the first synchronizer are respectively connected with the fourth gear and the eleventh gear; two ends of the second synchronizer are respectively connected with the eighth gear and the sixth gear;
the driving end of the first clutch is connected with the output shaft, and the driven end of the first clutch is connected with the normally meshed sleeve of the second synchronizer;
the driving end of the second clutch is connected with the output shaft, and the driven end of the second clutch is connected with the normally meshed sleeve of the first synchronizer;
the seventh gear is meshed with the eighth gear; the fifth gear is meshed with the sixth gear; the second gear is meshed with the fourth gear through the third gear; the tenth gear is in mesh with the eleventh gear.
Still further, a twelfth gear and a thirteenth gear are also included;
the thirteenth gear is meshed with the ninth gear through the twelfth gear and connects the first gear pump and the second gear pump.
Further, the hydraulic pump and the hydraulic motor are mounted within a flywheel housing of the engine;
the hydraulic pump is a bidirectional variable pump;
the hydraulic motor is a fixed displacement motor.
Furthermore, the first synchronizer and the second synchronizer are output shaft connecting sleeves;
the end part of the output shaft is provided with a connecting gear sleeve used for connecting a rear axle of a tractor.
Still further, the first clutch and the second clutch are both wet clutches.
Still further, a third clutch is also included;
the driving end of the third clutch is connected to the input shaft, and the driven end of the third clutch is connected with a PTO output shaft;
the third clutch is located on a side of the ninth gear facing away from the hydraulic pump.
Further, the first stage operating condition is: the first clutch is engaged, the second clutch is disengaged, the first synchronizer is in a right position and the second synchronizer is in a right position;
the input power of the engine is transmitted to a first sun gear of the branch and confluence planetary mechanism through the input shaft, the hydraulic pump and the hydraulic motor in sequence; mechanical path power is transmitted to the first ring gear of the split and confluence planetary mechanism through the ninth gear and the first gear; after the mechanical power and the hydraulic power are converged in the branch and convergence planetary mechanism, the mechanical power and the hydraulic power are output through the second gear ring and are transmitted to the output shaft through the fifth gear, the sixth gear, the second synchronizer and the first clutch in sequence.
Further, the second section working condition is: the first clutch is disengaged, the second clutch is engaged, the first synchronizer is in a right position and the second synchronizer is in a left position;
the obtained input power of an engine is transmitted to the first sun gear of the split and confluence planetary mechanism through the input shaft, the hydraulic pump and the hydraulic motor; mechanical path power is transmitted to a first ring gear of the split and confluence planetary mechanism through the ninth gear and the first gear; after the split and confluence planetary mechanism converges, the mechanical power and the hydraulic power are transmitted to the output shaft through the second ring gear, the second sun gear, the tenth gear, the eleventh gear, the first synchronizer and the second clutch.
Further, the third operating condition is: the first clutch is engaged, the second clutch is disengaged, the first synchronizer is in a right position and the second synchronizer is in a left position;
the input power of the engine is transmitted to the first sun gear of the split and confluence planetary mechanism through the input shaft, the hydraulic pump and the hydraulic motor;
mechanical path power is transmitted to the first ring gear of the split and confluence planetary mechanism through the ninth gear and the first gear;
after the split and confluence planetary mechanism converges, mechanical power and hydraulic power are output through the second gear ring of the split and confluence planetary mechanism and are transmitted to an output shaft through the seventh gear, the eighth gear, the second synchronizer and the first clutch.
Further, the working conditions of the reverse gear section are as follows: the first clutch is disengaged, the second clutch is engaged, the first synchronizer is in a left position and the second synchronizer is in a right position;
the input power of the engine is transmitted to the first sun gear of the split and confluence planetary mechanism through the input shaft, the hydraulic pump and the hydraulic motor;
mechanical path power is transmitted to the first ring gear of the split and confluence planetary mechanism through the ninth gear and the first gear;
after the split and confluence planetary mechanism converges, the mechanical power and the hydraulic power are output through the second ring gear and are transmitted to an output shaft through the second gear, the third gear, the fourth gear, the first synchronizer S1 and the second clutch.
Has the advantages that:
the multi-power flow composite stepless transmission device is suitable for a tractor, the combination of mechanical power and hydraulic power is realized through a hydraulic speed regulating loop and a branch and confluence planetary mechanism, and a forward gear comprises three hydraulic mechanical sections which are a first section for starting, a second section for low-speed operation and a third section for high-speed walking respectively; the reverse gear only comprises one reverse section; the three hydraulic mechanical sections of the forward gear can continuously change the speed, the speed of the hydraulic element continuously changes, the clutch has no speed difference switching, the operation is simple, the transmission efficiency is high, the power of the required hydraulic element is low, the high-efficiency stepless transmission can be realized, the stable load of the engine is maintained, and the fuel economy is improved.
Compared with the existing manual transmission of a tractor, the multi-power flow composite stepless transmission device can greatly improve the working efficiency, and can ensure that an engine always works in an economic rotating speed range, thereby reducing the oil consumption and the noise level of the tractor.
Drawings
FIG. 1 is a schematic representation of the drive configuration of a tractor drive train equipped with the multiple power flow compound continuously variable transmission of the present invention;
fig. 2 is a schematic diagram of the transmission of the multiple power flow compound continuously variable transmission of the present invention.
Wherein, 1-engine, 2-stepless transmission, 3-first gear pump, 4-second gear pump, 5-tire, 6-wheel reduction mechanism, 7-brake, 8-differential, 9-double speed PTO transmission mechanism, 10-front axle transmission system, 11-rear axle input shaft, 201-input shaft, 202-hydraulic pump motor assembly, 203-hydraulic pump, 204-hydraulic motor, 205-first gear, 206-first gear ring, 207-second gear ring, 208-first sun gear, 209-second sun gear, 210-planet carrier, K1-first clutch, K2-second clutch, 213-second gear, 214-third gear, 215-fourth gear, 216-fifth gear, 217-sixth gear, 218-seventh gear, 219-eighth gear, 220-ninth gear, 221-twelfth gear, 222-thirteenth gear, K3-third clutch, 224-PTO output shaft, S1-first synchronizer, S2-second synchronizer, 226-motor output shaft, 227-output shaft, 228-tenth gear, 229-eleventh gear, 230-connecting gear sleeve
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a transmission structure of a tractor transmission system equipped with a multiple power flow compound continuously variable transmission (hereinafter referred to as a continuously variable transmission 2) of an embodiment of the present invention; the tractor transmission system comprises an engine 1, a gearbox, a first gear pump 3, a second gear pump 4, tires 5, a wheel reduction mechanism 6, a brake 7, a differential 8, a double-speed PTO (agricultural machinery) transmission mechanism 9, a front axle transmission system 10 and a rear axle input shaft 11; the gearbox adopts the stepless transmission device 2 of the invention; the power of the engine 1 is input to the stepless transmission device 2 of the invention, and the first gear pump 3 and the second gear pump 4 are externally hung on the stepless transmission device 2. The continuously variable transmission 2 has two outputs, one of which is connected to a PTO output shaft 224 (agricultural output shaft) of the tractor rear axle and the other of which is connected to a rear axle input shaft 11 of the tractor rear axle.
As shown in the structure of fig. 2, the present invention provides a multi-power flow compound stepless transmission device 2, which comprises an input shaft 201, an output shaft 227, a hydraulic speed regulation loop, a branch and confluence planetary mechanism, a fixed shaft gear transmission mechanism, a segment shifting mechanism and an auxiliary system; the input shaft 201 is connected with the engine 1 and used for inputting the power of the engine 1;
the hydraulic speed regulating circuit is used for connecting the engine 1, can be a hydraulic pump motor assembly 202 and comprises a hydraulic pump 203 and a hydraulic motor 204; the hydraulic pump 203 and the hydraulic motor 204 are connected through a high-pressure oil way to form a closed hydraulic loop; hydraulic pump 203 may be a bidirectional variable displacement pump; hydraulic motor 204 may be a fixed displacement motor; the hydraulic pump 203 and the hydraulic motor 204 may be mounted in a flywheel housing (not shown in the figure) of the engine 1;
the splitting and converging planetary mechanism is an external-meshing double-star-row planetary mechanism, comprises a first sun gear 208, a second sun gear 209, a planet carrier 210, a first gear ring 206 and a second gear ring 207, and is used for splitting and converging hydraulic power and mechanical power; as shown in the structure of FIG. 2, the external-engagement double-planetary gear set adopts a planet carrier 210 to connect two planetary gear mechanisms together; one end of the carrier 210 is meshed with the first sun gear 208 and the first ring gear 206, and constitutes a first planetary gear mechanism; the other end of the carrier 210 is engaged with the second sun gear 209 and the second ring gear 207 to constitute a second planetary gear mechanism; the first planetary gear mechanism and the second planetary gear mechanism are arranged in parallel and share one planet carrier 210;
the fixed-axis gear transmission mechanism includes a first gear 205, a second gear 213, a third gear 214, a fourth gear 215, a fifth gear 216, a sixth gear 217, a seventh gear 218, an eighth gear 219, a ninth gear 220, a tenth gear 228, and an eleventh gear 229;
the section shifting mechanism comprises a first clutch K1, a second clutch K2, a first synchronizer S1 and a second synchronizer S2; the first clutch K1 and the second clutch K2 are used for power-interruption-free shifting; the first clutch K1 and the second clutch K2 may both be wet clutches; the first synchronizer S1 and the second synchronizer S2 can be connecting sleeves of the output shaft 227; also, a coupling sleeve 230 for coupling a rear axle of the tractor may be provided at an end of the output shaft 227;
the auxiliary system comprises a first gear pump 3 and a second gear pump 4; the first gear pump 3 is communicated with the closed hydraulic circuit and is used for maintaining the pressure of the closed hydraulic circuit; the second gear pump 4 provides control oil pressure for the hydraulic pump 203 and the hydraulic motor 204 and provides lubricating oil for the section changing mechanism;
the stepless transmission device 2 can realize a first section for a starting working condition, a second section for a low-speed working condition, a third section for a high-speed driving working condition and a reversing section for a reversing working condition; the first section, the second section, the third section and the reversing section are all hydraulic mechanical sections;
one end of the input shaft 201 is used for connecting the engine 1, and the other end of the input shaft penetrates through the hydraulic pump 203 and then is connected with the ninth gear 220;
the first gear 205 is connected with the first gear ring 206 and is sleeved on the motor output shaft 226; the first gear 205 meshes with the ninth gear 220;
the first sun gear 208 is connected to 226 of the hydraulic motor 204, and is meshed with the first ring gear 206 through one end of the carrier 210, and the other end of the carrier 210 is meshed with the second sun gear 209 and the second ring gear 207; the second sun gear 209 is connected to the tenth gear 228;
the second ring gear 207 connects the seventh gear 218, the fifth gear 216, and the second gear 213;
the first synchronizer S1 and the second synchronizer S2 are both sleeved on the output shaft 227; both ends of the first synchronizer S1 are connected to the fourth gear 215 and the eleventh gear 229, respectively; both ends of the second synchronizer S2 are connected with the eighth gear 219 and the sixth gear 217, respectively;
the driving end of the first clutch K1 is connected with the output shaft 227, and the driven end is connected with the constant mesh sleeve of the second synchronizer S2;
the driving end of the second clutch K2 is connected with the output shaft 227, and the driven end is connected with the constant mesh sleeve of the first synchronizer S1;
the seventh gear 218 meshes with the eighth gear 219; the fifth gear 216 is meshed with the sixth gear 217; the second gear 213 is meshed with the fourth gear 215 through the third gear 214; the tenth gear 228 meshes with the eleventh gear 229;
the multi-power flow composite stepless transmission device 2 is suitable for tractors, and has the following beneficial effects by adopting the structure:
1. the hydraulic power and the mechanical power are combined, the hydraulic path only transmits partial power, most of the power is transmitted through the mechanical path, high transmission efficiency and stepless speed change are realized, the working efficiency can be improved, and the oil consumption of the engine 1 can be reduced; the whole process is in stepless speed regulation, so that the engine 1 can always work in an economic rotating speed range, the fuel economy is improved, and the fuel consumption and the noise level of the tractor are reduced;
2. the three-section continuous type is adopted, the first section is used for starting and ultra-low speed operation, the second section is used for low speed operation, the third section is used for high speed walking, the three sections are all hydraulic mechanical composite sections, the transmission efficiency is improved, the whole process is automatically and steplessly regulated, and compared with a traditional manual transmission, the labor intensity of gear shifting operation is greatly reduced;
3. zero-speed-difference switching of the clutch between the sections can be realized, and the service life of the friction plate of the clutch is prolonged; only one clutch is operated during the inter-segment switching, so that the design of a gear shifting logic and an operating system is simplified;
4. due to the existence of the hydraulic speed regulating loop, power gear shifting can be realized, the clutch at the next section is engaged firstly, and then the clutch at the previous section is released, so that uninterrupted output of power is ensured, and the operating efficiency is improved;
meanwhile, the pump motor of the stepless transmission device 2 is arranged in the flywheel shell, and the split-confluence planetary mechanism, the fixed-shaft gear transmission mechanism and the section-changing mechanism form a two-shaft type arrangement form, so that the stepless transmission device is very suitable for arrangement of a gearbox of a tractor.
The stepless transmission device 2 realizes the combination of mechanical power and hydraulic power through a hydraulic speed regulation loop and a branch confluence planetary mechanism, realizes three forward gears and one reverse gear through the matching of two clutches and two synchronizers, can realize zero speed difference switching between the three forward gears, has no speed difference switching of the clutches, is simple to operate, can realize high-efficiency transmission and stepless speed change through the combination of mechanical power and hydraulic power, can improve the operation efficiency, improves the fuel economy and ensures the continuous output of power.
In a specific embodiment, as shown in the structure of fig. 2, the continuously variable transmission 2 further includes a twelfth gear 221 and a thirteenth gear 222; the thirteenth gear 222 meshes with the ninth gear 220 through the twelfth gear 221, and connects the first gear pump 3 and the second gear pump 4.
The stepless transmission device 2 can realize power section changing through the first gear pump 3 and the second gear pump 4, when the sections are connected, the clutch at the next section can be engaged firstly, and then the clutch at the previous section is separated, so that uninterrupted power transmission is realized, uninterrupted power transmission is ensured, the operation efficiency is improved, and the gear shifting comfort is ensured.
Further, the above-described continuously variable transmission 2 may further include a third clutch K3; as shown in the structure of fig. 2, the driving end of the third clutch K3 is connected to the input shaft 201, and the driven end is connected to the PTO output shaft 224; the third clutch K3 is located on the side of the ninth gear 220 facing away from the hydraulic pump 203. The power source of the PTO output shaft 224 can be conveniently controlled by the third clutch K3.
The first stage of the continuously variable transmission 2 described above is: the first clutch K1 is engaged, the second clutch K2 is disengaged, the first synchronizer S1 is in a right position and the second synchronizer S2 is in a right position; the input power of the engine 1 is transmitted to a first sun gear 208 of the split-and-merge planetary mechanism sequentially through an input shaft 201, a hydraulic pump 203, and a hydraulic motor 204; the mechanical path power is transmitted to the first ring gear 206 of the split and confluence planetary mechanism through the ninth gear 220 and the first gear 205; the mechanical power and the hydraulic power are merged in the split-merge planetary mechanism, output through the second ring gear 207, and transmitted to the output shaft 227 via the fifth gear 216, the sixth gear 217, the second synchronizer S2, and the first clutch K1 in this order.
The second stage of the continuously variable transmission 2 described above is: the first clutch K1 is disengaged, the second clutch K2 is engaged, the first synchronizer S1 is in the right position and the second synchronizer S2 is in the left position; the obtained input power of the engine 1 is transmitted to a first sun gear 208 of the split/confluence planetary mechanism through an input shaft 201, a hydraulic pump 203 and a hydraulic motor 204; the mechanical path power is transmitted to the first ring gear 206 of the split and confluence planetary mechanism through the ninth gear 220 and the first gear 205; the mechanical power and the hydraulic power are transmitted to the output shaft 227 through the second ring gear 207, the second sun gear 209, the tenth gear 228, the eleventh gear 229, the first synchronizer S1, and the second clutch K2 after being converged by the branching and converging planetary mechanism.
The third stage of the continuously variable transmission 2 is: the first clutch K1 is engaged, the second clutch K2 is disengaged, the first synchronizer S1 is in the right position and the second synchronizer S2 is in the left position; the input power of the engine 1 is transmitted to the first sun gear 208 of the split-and-merge planetary mechanism via the input shaft 201, the hydraulic pump 203, and the hydraulic motor 204; the mechanical path power is transmitted to the first ring gear 206 of the split and confluence planetary mechanism through the ninth gear 220 and the first gear 205; the mechanical power and the hydraulic power are output through the second ring gear 207 of the split/merge planetary mechanism after being merged at the split/merge planetary mechanism, and are transmitted to the output shaft 227 via the seventh gear 218, the eighth gear 219, the second synchronizer S2, and the first clutch K1.
The reverse gear section working condition of the stepless transmission device 2 is as follows: the first clutch K1 is disengaged, the second clutch K2 is engaged, the first synchronizer S1 is in the left position and the second synchronizer S2 is in the right position; the input power of the engine 1 is transmitted to the first sun gear 208 of the split-and-merge planetary mechanism via the input shaft 201, the hydraulic pump 203, and the hydraulic motor 204; the mechanical path power is transmitted to the first ring gear 206 of the split and confluence planetary mechanism through the ninth gear 220 and the first gear 205; the mechanical power and the hydraulic power are output through the second ring gear 207 after being merged in the split-and-merge planetary mechanism, and are transmitted to the output shaft 227 via the second gear 213, the third gear 214, the fourth gear 215, the first synchronizer S1, and the second clutch K2.
The shift logic of the continuously variable transmission 2 described above is shown in table 1 below.
TABLE 1 Shift logic Table for continuously variable Transmission
In the embodiment of the present invention, the left side of the first synchronizer S1 and the left side of the second synchronizer S2 are both the left side of the page in FIG. 2, and the right side of the first synchronizer S1 and the right side of the second synchronizer S2 are both the right side of the page in FIG. 2.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A multi-power flow composite stepless transmission device is characterized by comprising an input shaft, an output shaft, a hydraulic speed regulating loop, a branch and confluence planetary mechanism, a fixed shaft gear transmission mechanism, a segment changing mechanism and an auxiliary system;
the hydraulic speed regulating loop is used for connecting an engine and comprises a hydraulic pump and a hydraulic motor; the hydraulic pump and the hydraulic motor are connected through a high-pressure oil way to form a closed hydraulic loop;
the splitting and converging planetary mechanism is an external-meshing double-star-row, comprises a first sun gear, a second sun gear, a planet carrier, a first gear ring and a second gear ring, and is used for splitting and converging hydraulic power and mechanical power;
the fixed shaft gear transmission mechanism comprises a first gear, a second gear, a third gear, a fourth gear, a fifth gear, a sixth gear, a seventh gear, an eighth gear, a ninth gear, a tenth gear and an eleventh gear;
the section changing mechanism comprises a first clutch, a second clutch, a first synchronizer and a second synchronizer; the first clutch and the second clutch are used for power-interrupt-free switching;
the auxiliary system comprises a first gear pump and a second gear pump; the first gear pump is communicated with the closed hydraulic circuit and is used for maintaining the pressure of the closed hydraulic circuit; the second gear pump provides control oil pressure for the hydraulic pump and the hydraulic motor and provides lubricating oil for the section changing mechanism;
the stepless transmission device can realize a first section for a starting working condition, a second section for a low-speed working condition, a third section for a high-speed driving working condition and a reversing section for a reversing working condition, wherein the first section, the second section, the third section and the reversing section are all hydraulic mechanical sections;
one end of the input shaft is used for connecting the engine, and the other end of the input shaft penetrates through the hydraulic pump and then is connected with the ninth gear;
the first gear is connected with the first gear ring and is sleeved on the motor output shaft in an empty mode; the first gear is meshed with the ninth gear;
the first sun gear is connected with a motor output shaft of the hydraulic motor and is meshed with the first gear ring through one end of the planet carrier, and the other end of the planet carrier is meshed with the second sun gear and the second gear ring; the second sun gear is connected with the tenth gear;
the second ring gear is connected with the seventh gear, the fifth gear and the second gear;
the first synchronizer and the second synchronizer are sleeved on the output shaft in a hollow manner; two ends of the first synchronizer are respectively connected with the fourth gear and the eleventh gear; two ends of the second synchronizer are respectively connected with the eighth gear and the sixth gear;
the driving end of the first clutch is connected with the output shaft, and the driven end of the first clutch is connected with the normally meshed sleeve of the second synchronizer;
the driving end of the second clutch is connected with the output shaft, and the driven end of the second clutch is connected with the normally meshed sleeve of the first synchronizer;
the seventh gear is meshed with the eighth gear; the fifth gear is meshed with the sixth gear; the second gear is meshed with the fourth gear through the third gear; the tenth gear is in mesh with the eleventh gear.
2. The variable transmission of claim 1, further comprising a twelfth gear and a thirteenth gear;
the thirteenth gear is meshed with the ninth gear through the twelfth gear and connects the first gear pump and the second gear pump.
3. The continuously variable transmission of claim 2, wherein said hydraulic pump and said hydraulic motor are mounted within a flywheel housing of said engine;
the hydraulic pump is a bidirectional variable pump;
the hydraulic motor is a fixed displacement motor.
4. A continuously variable transmission as claimed in claim 3, in which the first synchronizer and the second synchronizer are output shaft connection sleeves;
the end part of the output shaft is provided with a connecting gear sleeve used for connecting a rear axle of a tractor.
5. The variable transmission of claim 4, wherein the first clutch and the second clutch are both wet clutches.
6. The variable transmission of claim 5, further comprising a third clutch;
the driving end of the third clutch is connected to the input shaft, and the driven end of the third clutch is connected with a PTO output shaft;
the third clutch is located on a side of the ninth gear facing away from the hydraulic pump.
7. The variable transmission of any one of claims 1-6, wherein the first segment of operating conditions is: the first clutch is engaged, the second clutch is disengaged, the first synchronizer is in a right position and the second synchronizer is in a right position;
the input power of the engine is transmitted to a first sun gear of the branch and confluence planetary mechanism through the input shaft, the hydraulic pump and the hydraulic motor in sequence; mechanical path power is transmitted to the first ring gear of the split and confluence planetary mechanism through the ninth gear and the first gear; after the mechanical power and the hydraulic power are converged in the branch and convergence planetary mechanism, the mechanical power and the hydraulic power are output through the second gear ring and are transmitted to the output shaft through the fifth gear, the sixth gear, the second synchronizer and the first clutch in sequence.
8. A continuously variable transmission as claimed in any one of claims 1 to 6, in which the second stage conditions are: the first clutch is disengaged, the second clutch is engaged, the first synchronizer is in a right position and the second synchronizer is in a left position;
the obtained input power of an engine is transmitted to the first sun gear of the split and confluence planetary mechanism through the input shaft, the hydraulic pump and the hydraulic motor; mechanical path power is transmitted to a first ring gear of the split and confluence planetary mechanism through the ninth gear and the first gear; after the split and confluence planetary mechanism converges, the mechanical power and the hydraulic power are transmitted to the output shaft through the second ring gear, the second sun gear, the tenth gear, the eleventh gear, the first synchronizer and the second clutch.
9. A continuously variable transmission as claimed in any one of claims 1 to 6, in which the third regime is: the first clutch is engaged, the second clutch is disengaged, the first synchronizer is in a right position and the second synchronizer is in a left position;
the input power of the engine is transmitted to the first sun gear of the split and confluence planetary mechanism through the input shaft, the hydraulic pump and the hydraulic motor;
mechanical path power is transmitted to the first ring gear of the split and confluence planetary mechanism through the ninth gear and the first gear;
after the split and confluence planetary mechanism converges, mechanical power and hydraulic power are output through the second gear ring of the split and confluence planetary mechanism and are transmitted to an output shaft through the seventh gear, the eighth gear, the second synchronizer and the first clutch.
10. The variable transmission of any one of claims 1-6, wherein the reverse range operating condition is: the first clutch is disengaged, the second clutch is engaged, the first synchronizer is in a left position and the second synchronizer is in a right position;
the input power of the engine is transmitted to the first sun gear of the split and confluence planetary mechanism through the input shaft, the hydraulic pump and the hydraulic motor;
mechanical path power is transmitted to the first ring gear of the split and confluence planetary mechanism through the ninth gear and the first gear;
after the split and confluence planetary mechanism converges, mechanical power and hydraulic power are output through the second gear ring and are transmitted to an output shaft through the second gear, the third gear, the fourth gear, the first synchronizer and the second clutch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110307148.XA CN113090731A (en) | 2021-03-23 | 2021-03-23 | Multi-power flow composite stepless transmission device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110307148.XA CN113090731A (en) | 2021-03-23 | 2021-03-23 | Multi-power flow composite stepless transmission device |
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| CN113090731A true CN113090731A (en) | 2021-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110307148.XA Pending CN113090731A (en) | 2021-03-23 | 2021-03-23 | Multi-power flow composite stepless transmission device |
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| Country | Link |
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| CN (1) | CN113090731A (en) |
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Application publication date: 20210709 |