CN111268111A - Bevel gear coaxial contra-rotating dual-rotor transmission device with twice power splitting - Google Patents
Bevel gear coaxial contra-rotating dual-rotor transmission device with twice power splitting Download PDFInfo
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- CN111268111A CN111268111A CN202010124753.9A CN202010124753A CN111268111A CN 111268111 A CN111268111 A CN 111268111A CN 202010124753 A CN202010124753 A CN 202010124753A CN 111268111 A CN111268111 A CN 111268111A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 57
- 230000009977 dual effect Effects 0.000 claims description 11
- 239000003638 chemical reducing agent Substances 0.000 abstract description 8
- 238000012545 processing Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/04—Helicopters
- B64C27/12—Rotor drives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/04—Helicopters
- B64C27/08—Helicopters with two or more rotors
- B64C27/10—Helicopters with two or more rotors arranged coaxially
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D35/00—Transmitting power from power plants to propellers or rotors; Arrangements of transmissions
- B64D35/04—Transmitting power from power plants to propellers or rotors; Arrangements of transmissions characterised by the transmission driving a plurality of propellers or rotors
- B64D35/06—Transmitting power from power plants to propellers or rotors; Arrangements of transmissions characterised by the transmission driving a plurality of propellers or rotors the propellers or rotors being counter-rotating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D35/00—Transmitting power from power plants to propellers or rotors; Arrangements of transmissions
- B64D35/08—Transmitting power from power plants to propellers or rotors; Arrangements of transmissions characterised by the transmission being driven by a plurality of power plants
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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
- F16H1/00—Toothed gearings for conveying rotary motion
- F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
- F16H1/20—Toothed gearings for conveying rotary motion without gears having orbital motion involving more than two intermeshing members
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gear Transmission (AREA)
Abstract
The invention relates to a bevel gear coaxial contra-rotating dual-rotor transmission device with twice power splitting. The main reducer of the helicopter is mainly applied to the main reducer of the helicopter, and has the advantages of compact structure, easiness in processing, high transmission efficiency, smaller load borne by gear teeth, larger power-weight ratio and higher reliability. The engine is connected with the straight-tooth cylindrical gear through the power input shaft, and the straight-tooth cylindrical gear is meshed with the two non-orthogonal face gears simultaneously, so that power split and primary speed reduction are realized, the torque transmitted by the gear pair is reduced, and the reversing function is completed; the non-orthogonal face gear is connected with the straight-tooth cylindrical gear through a duplicate gear shaft and uniformly transmits power to the four straight-tooth cylindrical gears, so that secondary power splitting and secondary speed reduction are realized; power is transmitted to the four spiral bevel gears through the four duplicate gear shafts by the four straight-tooth cylindrical gears, and the four spiral bevel gears are respectively meshed with the upper bevel gear and the lower bevel gear, so that three-level speed reduction and primary power parallel operation confluence are realized.
Description
Technical Field
The invention relates to a power transmission system of a helicopter, in particular to a bevel gear coaxial contra-rotating dual-rotor transmission device with twice power splitting.
Background
As one of the unique creations of the aviation technology in the 20 th century, the helicopter can be used for vertical take-off and landing and hovering in the field, has good low-altitude maneuvering performance, and has an important role which can not be replaced by other aircrafts in the field of military and civilian use. The transmission system is one of three key moving parts (an engine, a transmission system and a rotor system) of the helicopter, and the configuration mode of a main speed reducer directly determines the performance of the helicopter, so that the overall flight performance of the helicopter is influenced. The helicopter is typically a coaxial contra-rotating dual-rotor high-speed helicopter.
Compared with a single-rotor helicopter, the length and the rotating area of the rotors of the coaxial contra-rotating double-rotor helicopter are reduced, the radius of the rotors is about 70 percent of that of the single-rotor helicopter, the fuselage of the coaxial contra-rotating double-rotor helicopter is shorter than that of the single-rotor helicopter, and the longitudinal dimension of the coaxial contra-rotating double-rotor helicopter is only about 60 percent of that of the single-rotor helicopter. Meanwhile, the structural mass and the load of the coaxial contra-rotating dual-rotor helicopter are concentrated at the gravity center position of the helicopter, so that the pitching and yawing rotational inertia of the helicopter is reduced compared with that of a single-rotor helicopter. The Russian Muco design office develops a series of coaxial dual-rotor helicopters, which are in the front of the world in terms of model development and theoretical experimental research, and a helicopter card-50 successfully developed in the 90 s is praised as the most advanced armed attack helicopter in the modern world by the West. The SB-1defiant helicopter developed in the United states is capable of twice the speed and range of a conventional helicopter in design and is a candidate for the United states army 'future vertical takeoff and landing aircraft' (FVL) project.
At present, coaxial twin-rotor helicopters are used as key projects for research in some developed countries in Europe, and a large amount of manpower and material resources are invested in the coaxial twin-rotor helicopters.
Chinese patent CN103112585A "a main reducer for small and medium sized helicopters", which is a main reducer for helicopters of planetary transmission mechanism, but the transmission mechanism is limited by volume and weight, cannot realize large transmission ratio, and is not suitable for a novel helicopter transmission system.
Chinese patent CN103968003A "torque-dividing transmission mechanism for main speed reducer of helicopter" uses straight gear input, two straight gears on the input shaft are respectively meshed with corresponding face gears, the straight gears coaxial with the face gears realize torque division, and finally, herringbone gear cylindrical gears are adopted for parallel operation and confluence output. However, since it is difficult to accurately achieve power-to-half split between two spur gears used on the input shaft, the spur gears near the engine end can bear most of the torque, and the service life can be greatly reduced.
Chinese patent CN109707798A "bevel gear-cylindrical gear double power split coaxial dual-rotor transmission" uses bevel gear power split transmission, cylindrical gear power re-split transmission and cylindrical gear power confluence transmission. The device uses the straight-teeth gear meshing at the car combination level, can reduce the gear contact ratio, reduces the bearing capacity of car combination level gear, and vertical size is great, is unfavorable for the configuration optimization design.
Disclosure of Invention
In view of this, the invention provides a bevel gear coaxial contra-rotating dual-rotor transmission device with twice power splitting, which can simultaneously realize reversing and twice power splitting, and comprises three-stage speed reduction and one-stage power convergence, and the transmission ratio of the last stage is larger.
In order to solve the problems in the prior art, the technical scheme of the invention is as follows: the utility model provides a two power split's bevel gear is coaxial to changeing pair rotor transmission, its characterized in that: the power input shaft is connected with a first straight-tooth cylindrical gear, and the first straight-tooth cylindrical gear is meshed with 2 non-orthogonal face gears simultaneously, so that primary speed reduction, primary power splitting and two-way splitting transmission are realized;
each non-orthogonal face gear is connected with a straight-tooth cylindrical gear through a duplicate gear shaft, each straight-tooth cylindrical gear is respectively meshed with 2 cylindrical gears to realize secondary speed reduction, secondary power split and four-way split transmission, 4 straight-tooth cylindrical gears are respectively connected with spiral bevel gears through the duplicate gear shaft, four spiral bevel gears are respectively supported in a radial floating mode, two spiral bevel gears at the upper end are connected with a first upper bevel gear, two spiral bevel gears at the lower end are connected with a second lower bevel gear to realize tertiary speed reduction and primary power parallel operation confluence; the center of the first upper bevel gear is connected with the first output shaft, the center of the second lower bevel gear is connected with the second output shaft, the first output shaft is a hollow shaft, the second output shaft penetrates through the center of the first output shaft, and the two output shafts coaxially rotate, have the same rotating speed and are opposite in rotating direction.
Furthermore, the first upper bevel gear is connected with the first tail wing transmission gear, and the second lower bevel gear is connected with the second tail wing transmission gear.
Further, a thrust bearing is arranged between the first upper bevel gear and the second lower bevel gear.
Furthermore, the power input shaft is provided with 1 at least, and when adopting a plurality of input shafts, each input shaft is evenly arranged according to the output shaft.
Further, the top end of the second output shaft is higher than the top end of the first output shaft.
Further, the straight toothed spur gear can be replaced by a straight toothed spur gear, a helical toothed spur gear or a herringbone toothed spur gear.
Further, the spiral bevel gear may be replaced with a straight bevel gear, a helical bevel gear, or a curved bevel gear.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the cylindrical gear-non-orthogonal face gear is adopted to realize primary speed reduction by shunting transmission, so that the torque transmitted by the gears in each branch is reduced, and the load born by each branch is reduced;
2. according to the invention, secondary speed reduction is realized by meshing the cylindrical gears and then power splitting is carried out, so that the transmission branch load is reduced, the structure of the whole device is reduced, the weight is reduced, and the power-weight ratio is increased;
3. according to the invention, confluence transmission is realized on two coaxial bevel gears to realize three-stage speed reduction, and a thrust bearing is used between the two bevel gears, so that the overall size and the mass of a main speed reducer are reduced, the height of the whole gearbox is reduced, the structure is more compact, and the modular structure design is facilitated;
4. the two bevel gears are meshed with the tail wing transmission gear, so that the stability is further improved, and meanwhile, the transmission device can realize multi-path input, and the bearing capacity and the range of the helicopter can be increased;
5. the invention is seen from the whole transmission system, because the power splitting is carried out twice, the speed reduction is carried out at three levels, the parallel operation and the confluence are carried out once, and the transmission system adopts a simple fixed-axis gear train, the structure is compact, the transmission efficiency is high, and the maneuverability is good; the load born by each branch gear tooth is small, the processing is easy, the technical realization is easy, and the application is wide.
Description of the drawings:
FIG. 1 is a schematic structural diagram of the basic configuration of a bevel gear coaxial contra-rotating dual-rotor transmission with two power splitting of a single engine input of the invention;
FIG. 2 is a schematic structural diagram of the basic configuration of a bevel gear coaxial contra-rotating dual-rotor transmission with two power splitting for dual engine input of the present invention;
FIG. 3 is a top, bottom, isometric view of the basic configuration of a dual engine input dual-rotor transmission with two power split bevel gears coaxially rotating in opposite directions;
reference numerals: 1. a first power input shaft, 2, a first spur gear, 3a, a first non-orthogonal face gear, 3b, a second non-orthogonal face gear, 4a, a second spur gear, 4b, a third spur gear, 5a, a fourth spur gear, 5b, a fifth spur gear, 5c, a sixth spur gear, 5d, a seventh spur gear, 6a, a first spiral bevel gear, 6b, a second spiral bevel gear, 6c, a third spiral bevel gear, 6d, a fourth spiral bevel gear, 7a, a first upper bevel gear, 7b, a second lower bevel gear, 8a, a first output shaft, 8b, a second output shaft tail fin, 9a, a first transmission gear, 9b, a second transmission gear, 10, a thrust bearing, 11, a second power input shaft.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The first embodiment is as follows:
a bevel gear coaxial contra-rotating dual-rotor transmission device with two power splitting input by a single engine is disclosed as shown in figure 1, the engine is connected with a first straight-tooth cylindrical gear 2 through a first power input shaft 1, and the first straight-tooth cylindrical gear 2 is meshed with a first non-orthogonal face gear 3a and a second non-orthogonal face gear 3b simultaneously, so that primary speed reduction, primary power splitting and two-way splitting transmission are realized.
The first non-orthogonal face gear 3a is fixedly connected with a second straight-toothed spur gear 4a through a duplicate gear shaft, the second straight-toothed spur gear 4a is simultaneously meshed with a fourth straight-toothed spur gear 5a and a fifth straight-toothed spur gear 5b, the second non-orthogonal face gear 3b is fixedly connected with a third straight-toothed spur gear 4b through the duplicate gear shaft, and the third straight-toothed spur gear 4b is simultaneously meshed with a sixth straight-toothed spur gear 5c and a seventh straight-toothed spur gear 5d, so that two-stage speed reduction, second power split and four-way split transmission are realized.
The fourth spur gear 5a is fixedly coupled to a first spiral bevel gear 6a through a dual gear shaft, the fifth spur gear 5b is fixedly coupled to a second spiral bevel gear 6b through a dual gear shaft, the sixth spur gear 5c is fixedly coupled to a third spiral bevel gear 6c through a dual gear shaft, the seventh spur gear 5d is fixedly coupled to a fourth spiral bevel gear 6d through a dual gear shaft, the first spiral bevel gear 6a, the second spiral bevel gear 6b, the third spiral bevel gear 6c, and the fourth spiral bevel gear 6d are all supported by radial floating, so as to improve uniform distribution of power, the first spiral bevel gear 6a and the third spiral bevel gear 6c are simultaneously engaged with a first upper bevel gear 7a, the second spiral bevel gear 6b and the fourth spiral bevel gear 6d are simultaneously engaged with a second lower bevel gear 7b, three-level speed reduction is realized, and primary power parallel operation confluence is realized.
The first upper bevel gear 7a is connected with a first output shaft 8a, the second lower bevel gear 7b is connected with a second output shaft 8b, the first output shaft is a hollow shaft, the second output shaft penetrates through the first output shaft, and the top end of the second output shaft is higher than that of the first output shaft; meanwhile, the first upper bevel gear 7a is meshed with the first tail wing transmission gear 9a, and the second lower bevel gear 7b is meshed with the second tail wing transmission gear 9b, so that the stability is further improved.
And a thrust bearing 10 is arranged between the first upper bevel gear 7a and the second lower bevel gear 7b, so that the overall size and the mass of the main speed reducer are reduced, and the height of the whole gearbox is reduced.
A thrust bearing 10 is provided between the first upper bevel gear 7a and the second lower bevel gear 7b, so that the structure in the height direction is more compact, and the height of the final drive is reduced.
The output shafts rotate coaxially, rotate at equal speeds and rotate in opposite directions.
Example two:
a bevel gear coaxial contra-rotating dual-rotor transmission device with double-engine input and double-power splitting is disclosed, as shown in figure 2 or figure 3, on the basis of the structure of an embodiment, a second power input shaft is arranged at the opposite position of a first power input shaft 1, the connection relation of gears on the second power input shaft is the same as that of the gears on the first power input shaft 1, and the second power input shaft is connected with an engine to realize dual-engine input.
The straight toothed spur gear can also be a helical toothed spur gear or a herringbone toothed spur gear; the spiral bevel gear can also be a straight bevel gear, a helical bevel gear or a curved bevel gear.
The diameters of the first non-orthogonal face gear and the second non-orthogonal face gear are the same, the diameters of the second straight-tooth cylindrical gear and the third straight-tooth cylindrical gear are the same, the diameters of the fourth straight-tooth cylindrical gear, the fifth straight-tooth cylindrical gear, the sixth straight-tooth cylindrical gear and the seventh straight-tooth cylindrical gear are the same, the diameters of the first spiral bevel gear, the second spiral bevel gear, the third spiral bevel gear and the fourth spiral bevel gear are the same, and the diameters of the first empennage transmission gear and the second empennage transmission gear are the same.
The invention can also adopt a multi-path power input unit, when the power input unit is multi-path, the multi-path power input unit is symmetrically arranged according to the output shaft, and the coaxial rotation of the output shaft is finally realized through power transmission, the rotating speeds are equal, and the rotating directions are opposite.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and it should be noted that those skilled in the art should make modifications and variations without departing from the principle of the present invention.
Claims (7)
1. The bevel gear coaxial contra-rotating double-rotor transmission device with twice power splitting is characterized in that: the power input shaft is connected with a first straight-tooth cylindrical gear, and the first straight-tooth cylindrical gear is meshed with 2 non-orthogonal face gears simultaneously, so that primary speed reduction, primary power splitting and two-way splitting transmission are realized;
each non-orthogonal face gear is connected with a straight-tooth cylindrical gear through a duplicate gear shaft, each straight-tooth cylindrical gear is respectively meshed with 2 cylindrical gears to realize secondary speed reduction, secondary power split and four-way split transmission, 4 straight-tooth cylindrical gears are respectively connected with spiral bevel gears through the duplicate gear shaft, four spiral bevel gears are respectively supported in a radial floating mode, two spiral bevel gears at the upper end are connected with a first upper bevel gear, two spiral bevel gears at the lower end are connected with a second lower bevel gear to realize tertiary speed reduction and primary power parallel operation confluence; the center of the first upper bevel gear is connected with the first output shaft, the center of the second lower bevel gear is connected with the second output shaft, the first output shaft is a hollow shaft, the second output shaft penetrates through the center of the first output shaft, and the two output shafts coaxially rotate, have the same rotating speed and are opposite in rotating direction.
2. The double power split bevel gear co-axial counter-rotating dual rotor transmission of claim 1, wherein: the first upper bevel gear is further connected with the first tail wing transmission gear, and the second lower bevel gear is further connected with the second tail wing transmission gear.
3. The double power split bevel gear co-axial counter-rotating twin-rotor transmission according to claim 1 or 2, characterized in that: and a thrust bearing is arranged between the first upper bevel gear and the second lower bevel gear.
4. The double power split bevel gear co-axial counter-rotating dual rotor transmission of claim 3, wherein: the power input shaft is provided with 1 at least, and when a plurality of input shafts are adopted, all the input shafts are uniformly arranged according to the output shaft.
5. The double power split bevel gear co-axial counter-rotating dual rotor transmission of claim 4, wherein: the top end of the second output shaft is higher than the top end of the first output shaft.
6. The double power split bevel gear co-axial counter-rotating dual rotor transmission of claim 5, wherein: the straight-tooth cylindrical gear can be replaced by a straight-tooth cylindrical gear, a helical gear or a herringbone-tooth cylindrical gear.
7. The double power split bevel gear co-axial counter-rotating dual rotor transmission of claim 6, wherein: the spiral bevel gear can be replaced by a straight bevel gear, a helical bevel gear or a curved bevel gear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010124753.9A CN111268111A (en) | 2020-02-27 | 2020-02-27 | Bevel gear coaxial contra-rotating dual-rotor transmission device with twice power splitting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010124753.9A CN111268111A (en) | 2020-02-27 | 2020-02-27 | Bevel gear coaxial contra-rotating dual-rotor transmission device with twice power splitting |
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| Publication Number | Publication Date |
|---|---|
| CN111268111A true CN111268111A (en) | 2020-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010124753.9A Pending CN111268111A (en) | 2020-02-27 | 2020-02-27 | Bevel gear coaxial contra-rotating dual-rotor transmission device with twice power splitting |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112357076A (en) * | 2020-08-24 | 2021-02-12 | 南京航空航天大学 | Coaxial dual-rotor helicopter transmission device with cylindrical gear shunt |
| CN113483060A (en) * | 2021-07-07 | 2021-10-08 | 重庆大学 | Torque-dividing gear transmission speed reducer for main speed reducer of coaxial helicopter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109707798A (en) * | 2019-01-07 | 2019-05-03 | 南京航空航天大学 | The coaxial rotor transmission device of bevel gear-roller gear power dividing twice |
| CN211943720U (en) * | 2020-02-27 | 2020-11-17 | 西安工业大学 | Power splitting and converging bevel gear coaxial dual-rotor transmission structure |
-
2020
- 2020-02-27 CN CN202010124753.9A patent/CN111268111A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109707798A (en) * | 2019-01-07 | 2019-05-03 | 南京航空航天大学 | The coaxial rotor transmission device of bevel gear-roller gear power dividing twice |
| CN211943720U (en) * | 2020-02-27 | 2020-11-17 | 西安工业大学 | Power splitting and converging bevel gear coaxial dual-rotor transmission structure |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112357076A (en) * | 2020-08-24 | 2021-02-12 | 南京航空航天大学 | Coaxial dual-rotor helicopter transmission device with cylindrical gear shunt |
| CN113483060A (en) * | 2021-07-07 | 2021-10-08 | 重庆大学 | Torque-dividing gear transmission speed reducer for main speed reducer of coaxial helicopter |
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