A coaxial counter-rotating twin-rotor speed reduction transmission configuration

Abstract

The invention discloses a coaxial counter-rotating double-rotor reduction transmission configuration, comprising an upper side gear, a lower side gear, a hollow outer rotor shaft and an inner rotor shaft. The upper side gear and the lower side gear are coaxially installed with their tooth surfaces perpendicular to each other, the hollow outer rotor shaft is aligned and fastened with the upper side gear, and the inner rotor shaft passes through the hollow outer rotor shaft and is aligned and fastened with the lower side gear; thrust bearings are installed at the upper ends of the upper side gear and the lower side gear, and tapered roller bearings are installed at their lower ends; one or more power input cylindrical gears are placed between the upper side gear and the lower side gear for meshing and driving, and each power input cylindrical gear is installed with a spherical roller bearing.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft, and in particular relates to a coaxial counter-rotating twin-rotor reduction transmission configuration. Background Art

[0002] Recently, the US helicopter manufacturer Sikorsky released clear photos of the SB-1 "Dauntless" prototype for the first time, and issued a statement saying that the speed and range of this type of helicopter reached 460 kilometers per hour and 424 kilometers per hour respectively, which is twice that of traditional helicopters, and especially emphasized its flexible maneuverability and innovative design. The SB-1 "Dauntless" helicopter has many technical innovations and historical breakthroughs, with many highlights such as doubled speed and range, pusher propellers, coaxial twin rotors, and smooth fuselage. Aircraft represented by Sikorsky's SB-1 "Dauntless" coaxial counter-rotating twin-rotor compound propulsion high-speed helicopter have become the focus of research and development today.

[0003] In the prior art, UAVs such as the "Seagull" use a simple one-stage transmission, but still use bevel gear reduction and reversing; the block III "Apache" uses a pair of face teeth, but for power diversion; only Sikorsky (patent number US8870538B2) uses a pair of face gear outputs in the last stage of reversing, but they are back-to-back (a large thrust bearing is used between the gears) and each is driven by a separate power input gear; the SB-1 "Dauntless" coaxial counter-rotating twin-rotor compound propulsion high-speed helicopter basically has a three-stage transmission in the main reducer configuration: the first stage is bevel gear reduction and reversing; the second stage is cylindrical gear power diversion reduction; the third stage is cylindrical gear reduction and parallel driving, but it should be realized that multi-stage transmission is a great test for power-to-weight ratio, transmission efficiency, structural strength and especially reliability. In particular, the use of bevel gear reversing will cause overload due to the excessively high manufacturing precision and installation precision that cannot be achieved, which seriously threatens its reliability.

[0004] In summary, how to overcome the shortcomings of multi-stage reducers, such as heavy weight, low transmission efficiency and poor reliability, has become an urgent problem to be solved. Summary of the invention

[0005] In order to solve the above technical problems, the present invention adopts the following technical solution: a coaxial counter-rotating twin-rotor reduction transmission configuration, characterized in that the configuration includes an upper gear 1, a lower gear 7, a hollow outer rotor shaft 4 and an inner rotor shaft 10,

[0006] The upper gear 1 and the lower gear 7 are coaxially mounted with their tooth surfaces perpendicular to their tooth surfaces.

[0007] The hollow outer rotor shaft 4 is aligned and tightly connected with the upper gear 1.

[0008] The inner rotor shaft 10 passes through the hollow outer rotor shaft 4 and is aligned and fastened to the lower gear 7.

[0009] The upper ends of the upper gear 1 and the lower gear 7 are both equipped with thrust bearings, and the lower ends are both equipped with tapered roller bearings;

[0010] The power input cylindrical gear is disposed between the upper gear 1 and the lower gear 7 and is meshed and driven with the upper gear 1 and the lower gear 7 .

[0011] Preferably, the upper gear 1 is provided with a first thrust bearing 3 at its upper end to withstand the huge upward lift of the rotor, and a first tapered roller bearing 2 is provided at its lower end to withstand the huge radial force of the rotor and the corresponding unidirectional axial recoil force.

[0012] Preferably, the lower gear 7 is provided with a second thrust bearing 8 at its upper end to withstand the huge upward lift of the rotor, and a second tapered roller bearing 9 is provided at its lower end to withstand the huge radial force of the rotor and the corresponding unidirectional axial recoil force.

[0013] Preferably, the power input cylindrical gear includes a first power input cylindrical gear 6 and a second power input cylindrical gear 11, wherein the first power input cylindrical gear 6 is installed with a first spherical roller bearing 5, and the second power input cylindrical gear 11 is installed with a second spherical roller bearing 12, and the first spherical roller bearing 5 and the second spherical roller bearing 12 not only bear extremely large radial forces, but also bear forces in other directions brought to the first power input cylindrical gear 6 and the second power input cylindrical gear 11 due to manufacturing and assembly errors.

[0014] Preferably, the power input cylindrical gear includes a first power input cylindrical gear 6, which is equipped with a first spherical roller bearing 5, which not only bears a huge radial force, but also bears forces in other directions brought to the first power input cylindrical gear 6 due to manufacturing and assembly errors.

[0015] Preferably, the axes of the power input cylindrical gear form an evenly divided angle.

[0016] Preferably, the pitch surfaces of the upper gear 1 and the lower gear 7 are perpendicular to the hollow outer rotor shaft 4 and the inner rotor shaft 10 , and the rotation center axes of the upper gear 1 and the lower gear 7 are coaxial with the axes of the hollow outer rotor shaft 4 and the inner rotor shaft 10 .

[0017] Preferably, the upper gear 1 and the lower gear 7 are spur gears having the same number of teeth and module.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1) By setting the upper and lower gears and the bearings for primary reduction, the high-reliability coaxial counter-rotation, reversing and car reduction functions can be simply realized;

[0020] 2) By setting up the spherical roller bearing, while bearing the great radial force, it also appropriately bears the forces in other directions brought to the power input cylindrical gear due to the manufacturing and assembly errors, thus ensuring the smooth and reliable transmission;

[0021] 3) By using high-strength, high-precision bearings, the reliability and durability of the rotor operation are greatly improved.

[0022] It should be appreciated that parts not involved in the present invention are the same as the prior art or can be implemented by using the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a preferred embodiment 1 of a coaxial counter-rotating twin-rotor reduction transmission configuration of the present invention;

[0024] Figure 2 It is a structural schematic diagram of a preferred embodiment 2 of a coaxial counter-rotating twin-rotor reduction transmission configuration of the present invention.

[0025] The accompanying drawings in the figure are marked as follows:

[0026] 1—upper gear, 2—first tapered roller bearing, 3—first thrust bearing, 4—hollow outer rotor shaft, 5—first spherical roller bearing, 6—first power input cylindrical gear, 7—lower gear, 8—second thrust bearing, 9—second tapered roller bearing, 10—inner rotor shaft, 11—second power input cylindrical gear, 12—second spherical roller bearing. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the implementation of the present invention clearer, the technical scheme in the embodiment of the present invention will be described in more detail below in conjunction with the drawings in the embodiment of the present invention. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of the embodiments.

[0028] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0029] The embodiments and directional terms described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0030] In a broad embodiment of the present invention, referring to Figure 1-2 A coaxial counter-rotating twin-rotor reduction transmission configuration, characterized in that the configuration includes an upper gear 1, a lower gear 7, a hollow outer rotor shaft 4 and an inner rotor shaft 10,

[0031] The upper gear 1 and the lower gear 7 are coaxially mounted with their tooth surfaces perpendicular to their tooth surfaces.

[0032] The hollow outer rotor shaft 4 is aligned and tightly connected with the upper gear 1.

[0033] The inner rotor shaft 10 passes through the hollow outer rotor shaft 4 and is aligned and fastened to the lower gear 7.

[0034] The upper ends of the upper gear 1 and the lower gear 7 are both equipped with thrust bearings, and the lower ends are both equipped with tapered roller bearings;

[0035] The power input cylindrical gear is disposed between the upper gear 1 and the lower gear 7 and is meshed and driven with the upper gear 1 and the lower gear 7 .

[0036] Preferably, the axes of the power input cylindrical gear form an evenly divided angle.

[0037] Preferably, the pitch surfaces of the upper gear 1 and the lower gear 7 are perpendicular to the hollow outer rotor shaft 4 and the inner rotor shaft 10 , and the rotation center axes of the upper gear 1 and the lower gear 7 are coaxial with the axes of the hollow outer rotor shaft 4 and the inner rotor shaft 10 .

[0038] Preferably, the upper gear 1 and the lower gear 7 are spur gears having the same number of teeth and module.

[0039] The preferred embodiments of the present invention are listed below in conjunction with the accompanying drawings to further describe the present invention in detail.

[0040] Example 1

[0041] like Figure 1 As shown, a coaxial counter-rotating twin-rotor reduction transmission configuration of the present embodiment has a first power input cylindrical gear 6 and a second power input cylindrical gear 11 symmetrically arranged in the horizontal direction, which are respectively arranged between the upper face gear 1 and the lower face gear 7 where the tooth surfaces face each other, and each of them is simultaneously meshed with the upper face gear 1 and the lower face gear 7 to drive the upper face gear 1 and the lower face gear 7 to rotate counter-rotating around the vertical center axis. While realizing the power input reversing reduction, each power input cylindrical gear evenly distributes the power to the two face gears.

[0042] In this embodiment, the upper gear 1 is aligned and fastened to the hollow outer rotor shaft 4, and rotates together; the lower gear 7 is aligned and fastened to the inner rotor shaft 10, and rotates together; the inner rotor shaft 10 passes through the hollow outer rotor shaft 4, realizing the coaxial counter-rotation of the hollow outer rotor shaft 4 and the inner rotor shaft 10.

[0043] In this embodiment, the upper gear 1 is equipped with a first thrust bearing 3 at its upper end to bear the huge upward lift of the rotor; the lower end is equipped with a first tapered roller bearing 2 to bear the huge radial force of the rotor and the corresponding unidirectional axial recoil force. In the same way, the lower gear 7 is equipped with a second thrust bearing 8 at its upper end to bear the huge upward lift of the rotor; the lower end is equipped with a second tapered roller bearing 9 to bear the huge radial force of the rotor and the corresponding unidirectional axial recoil force. The use of high-strength and high-precision bearings greatly improves the reliability and durability of the rotor operation.

[0044] In this embodiment, the first power input cylindrical gear 6 is installed with a first spherical roller bearing 5, and the second power input cylindrical gear 11 is installed with a second spherical roller bearing 12. The first spherical roller bearing 5 and the second spherical roller bearing 12 not only bear a large radial force, but also appropriately bear forces in other directions brought to the first power input cylindrical gear 6 and the second power input cylindrical gear 11 due to manufacturing and assembly errors, thereby ensuring smooth and reliable transmission.

[0045] Example 2

[0046] This embodiment provides a coaxial counter-rotating twin-rotor reduction transmission configuration, such as Figure 2 As shown, based on Example 1, only one power input cylindrical gear 6 is set in the horizontal direction. The first power input cylindrical gear 6 is placed between the upper gear 1 and the lower gear 7, and is meshed with the upper gear 1 and the lower gear 7 at the same time.

[0047] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A coaxial counter-rotating twin-rotor reduction transmission configuration, characterized in that: The configuration comprises an upper gear (1), a lower gear (7), a hollow outer rotor shaft (4) and an inner rotor shaft (10); the tooth surfaces of the upper gear (1) and the lower gear (7) are coaxially mounted perpendicularly to each other; the hollow outer rotor shaft (4) is aligned and fastened with the upper gear (1); the inner rotor shaft (10) passes through the hollow outer rotor shaft (4) and is aligned and fastened with the lower gear (7); thrust bearings are mounted on the upper ends of the upper gear (1) and the lower gear (7), and tapered roller bearings are mounted on the lower ends; the thrust bearings are used to withstand the great upward force of the rotor. The tapered roller bearing is used to bear the huge radial force of the rotor and the corresponding unidirectional axial recoil force; the upper gear (1) and the lower gear (7) are both spur gears; the power input cylindrical gear is arranged between the upper gear (1) and the lower gear (7) and is meshed and driven with the upper gear (1) and the lower gear (7); a spherical roller bearing is installed on the power input cylindrical gear, and the spherical roller bearing is used to bear the huge radial force and the force in other directions brought to the power input cylindrical gear due to manufacturing and assembly errors.

2. The coaxial counter-rotating twin-rotor reduction transmission configuration according to claim 1 is characterized in that: The upper gear (1) is provided with a first thrust bearing (3) at its upper end for bearing the huge upward lift of the rotor, and a first tapered roller bearing (2) is provided at its lower end for bearing the huge radial force of the rotor and the corresponding unidirectional axial recoil force.

3. The coaxial counter-rotating twin-rotor reduction transmission configuration according to claim 1 or 2, characterized in that: The lower gear (7) is provided with a second thrust bearing (8) at its upper end to bear the huge upward lift of the rotor, and a second tapered roller bearing (9) is provided at its lower end to bear the huge radial force of the rotor and the corresponding unidirectional axial recoil force.

4. The coaxial counter-rotating twin-rotor reduction transmission configuration according to claim 1 is characterized in that: The power input cylindrical gear comprises a first power input cylindrical gear (6) and a second power input cylindrical gear (11), wherein the first power input cylindrical gear (6) is installed with a first spherical roller bearing (5), and the second power input cylindrical gear (11) is installed with a second spherical roller bearing (12). The first spherical roller bearing (5) and the second spherical roller bearing (12) not only bear a large radial force, but also bear forces in other directions brought to the first power input cylindrical gear (6) and the second power input cylindrical gear (11) due to manufacturing and assembly errors.

5. The coaxial counter-rotating twin-rotor reduction transmission configuration according to claim 1 is characterized in that: The power input cylindrical gear comprises a first power input cylindrical gear (6), and the first power input cylindrical gear (6) is installed with a first spherical roller bearing (5), which not only bears a large radial force, but also bears forces in other directions brought to the first power input cylindrical gear (6) due to manufacturing and assembly errors.

6. The coaxial counter-rotating twin-rotor reduction transmission configuration according to claim 1, 4 or 5, characterized in that: The axes of the power input cylindrical gears form an evenly spaced angle.

7. The coaxial counter-rotating twin-rotor reduction transmission configuration according to claim 1 is characterized in that: The pitch surfaces of the upper gear (1) and the lower gear (7) are perpendicular to the hollow outer rotor shaft (4) and the inner rotor shaft (10), and the rotation center axes of the upper gear (1) and the lower gear (7) are coaxial with the axes of the hollow outer rotor shaft (4) and the axes of the inner rotor shaft (10).

8. The coaxial counter-rotating twin-rotor reduction transmission configuration according to claim 1 is characterized in that: The upper gear (1) and the lower gear (7) are spur gears with the same number of teeth and module.

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