Coaxial double-rotor loading test gear box
By designing a coaxial dual rotor loading test gear box with dual inputs and vertical placement of inner and outer shafts, the problem that traditional gear box cannot be connected to the inner and outer rotor shaft of the twin rotor helicopter reducer is solved, and the effective connection and test requirements of the coaxial dual rotor reducer loading test are achieved.
Patent Information
- Application Number
- CN202411855147.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2025-04-15
AI Technical Summary
In the prior art, the reducer of a coaxial twin-rotor helicopter has an internal and external rotor shaft and is a vertical structure. The traditional gearbox is usually a single input and single output, and does not have a coaxial internal and external shaft dual input, nor is it vertically placed. Therefore, it cannot be connected to the internal and external rotor shafts of the dual-rotor helicopter reducer, and cannot meet the connection requirements of the loading test of the coaxial twin-rotor reducer.
A coaxial dual rotor loading test gear box is designed, including a box, an input outer shaft, an input inner shaft, a hollow upper shaft, two loading units, two transmission units, a first cylindrical gear and a second cylindrical gear. Through the design of these components, the dual input and vertical placement of the inner and outer shafts can be connected to the inner and outer rotor shaft of the double rotor helicopter reducer.
The connection requirements for the loading test of coaxial dual rotor reducer are realized, which meets the needs of coaxial drive and vertical placement of the inner and outer shafts, ensuring the effectiveness and accuracy of the test.
Smart Images
Figure CN119827150A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of loading tests, and in particular to a coaxial twin-rotor loading test gearbox. Background Art
[0002] Currently, helicopters are divided into single-rotor and multi-rotor. Multi-rotors are mostly twin-rotors. Twin-rotors can be divided into longitudinal, parallel, cross and coaxial types. Coaxial is a common form. Coaxial twin rotors revolve around the same axis, with two rotors rotating in opposite directions on the upper and lower parts.
[0003] In the aforementioned prior art, the reducer of a coaxial twin-rotor helicopter is equipped with an inner and outer rotor shaft and is a vertical structure, while a traditional gearbox usually has a single input and a single output, does not have a coaxial inner and outer shaft dual input, and is not placed vertically; therefore, it cannot be connected to the inner and outer rotor shafts of the twin-rotor helicopter reducer, and cannot meet the connection requirements of the coaxial twin-rotor reducer loading test. Summary of the invention
[0004] The purpose of the present invention is to provide a coaxial twin-rotor loading test gearbox to solve the problem that the reducer of the coaxial twin-rotor helicopter in the prior art is equipped with inner and outer rotor shafts and is a vertical structure, while the traditional gearbox usually has a single input and a single output, does not have a coaxial inner and outer shaft dual input, and is not placed vertically; therefore, it cannot be connected to the inner and outer rotor shafts of the twin-rotor helicopter reducer, and cannot meet the connection requirements of the coaxial twin-rotor reducer loading test.
[0005] To achieve the above-mentioned objectives, the present invention provides a coaxial twin-rotor loading test gearbox, comprising a housing, an input outer shaft, an input inner shaft, a hollow upper shaft, two loading units, two transmission units, a first cylindrical gear and a second cylindrical gear, wherein the input outer shaft and the hollow upper shaft are both arranged inside the housing, the input inner shaft is arranged inside the input outer shaft and the hollow upper shaft, the two loading units are symmetrically arranged at both ends of the housing, the two transmission units are respectively arranged on the corresponding loading units, the first cylindrical gear is interference mounted on the input outer shaft, the second cylindrical gear is interference mounted on the hollow upper shaft, and the two transmission units are respectively connected to the input outer shaft and the hollow upper shaft through the first cylindrical gear and the second cylindrical gear.
[0006] Wherein, the loading unit includes a loading motor, a coupling and an output shaft, the output shaft is arranged at one end of the box body, and the two ends of the coupling are fixedly connected to one end of the output shaft and the output end of the loading motor respectively.
[0007] Among them, the transmission unit includes a bevel gear and an intermediate gear shaft, the intermediate gear shaft is arranged inside the box, the bevel gear is fixedly connected to the intermediate gear shaft and is sleeved on the outer wall of the intermediate gear shaft, the output shaft is provided with bevel teeth, the bevel gear is meshed with the bevel teeth, the intermediate gear shaft is provided with gears, and the first cylindrical gear and the second cylindrical gear are respectively meshed with the corresponding gears.
[0008] Among them, the coaxial twin-rotor loading test gearbox also includes a first spline sleeve, a second spline sleeve and a third spline sleeve, the first spline sleeve is arranged on the input outer shaft, the second spline sleeve is arranged on the hollow upper shaft and the input inner shaft, and the third spline sleeve is arranged on the second spline sleeve and the hollow upper shaft.
[0009] Among them, the coaxial twin-rotor loading test gearbox also includes a middle box cover and an upper box cover, the middle box cover is bolted to one side of the box body, and the upper box cover is bolted to the top of the box body.
[0010] The present invention provides a gearbox for a coaxial twin-rotor loading test. The loading unit is started to drive the transmission unit to operate, thereby driving the first cylindrical gear and the second cylindrical gear to drive the hollow upper shaft and the input outer shaft to rotate. The hollow upper shaft and the input outer shaft are connected to the inner and outer rotor shafts of the coaxial twin-rotor reducer. The input outer shaft and the hollow upper shaft are in the form of hollow shafts. The input inner shaft is sleeved in the center of the input outer shaft and the hollow upper shaft. The input inner shaft is fixed on the hollow upper shaft. Through the above-mentioned structural arrangement, the loading units at both ends drive the first cylindrical gear and the second cylindrical gear to rotate, and finally drive the input outer shaft and the input inner shaft respectively, so that they can be coaxial and driven inside and outside, and are placed vertically at the same time, thereby meeting all requirements of the coaxial twin-rotor reducer loading test. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.
[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention.
[0013] 1-housing, 2-input outer shaft, 3-input inner shaft, 4-hollow upper shaft, 5-first cylindrical gear, 6-second cylindrical gear, 7-loading motor, 8-coupling, 9-output shaft, 10-bevel gear, 11-intermediate gear shaft, 12-bevel gear, 13-gear, 14-first spline sleeve, 15-second spline sleeve, 16-third spline sleeve, 17-middle box cover, 18-upper box cover. DETAILED DESCRIPTION
[0014] Embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.
[0015] See also Figure 1 The present invention provides a coaxial twin-rotor loading test gearbox, comprising a box body 1, an input outer shaft 2, an input inner shaft 3, a hollow upper shaft 4, two loading units, two transmission units, a first cylindrical gear 5 and a second cylindrical gear 6, the loading unit comprising a loading motor 7, a coupling 8 and an output shaft 9, the transmission unit comprising a bevel gear 10 and an intermediate gear shaft 11, the coaxial twin-rotor loading test gearbox further comprising a first spline sleeve 14, a second spline sleeve 15 and a third spline sleeve 16, the coaxial twin-rotor loading test gearbox further comprising a middle box cover 17 and an upper box cover 18.
[0016] Among them, the input outer shaft 2 and the hollow upper shaft 4 are both arranged inside the housing 1, the input inner shaft 3 is arranged inside the input outer shaft 2 and the hollow upper shaft 4, the two loading units are symmetrically arranged at both ends of the housing 1, the two transmission units are respectively arranged on the corresponding loading units, the first cylindrical gear 5 is interference mounted on the input outer shaft 2, and the second cylindrical gear 6 is interference mounted on the hollow upper shaft 4, and the two transmission units are connected to the input outer shaft 2 and the hollow upper shaft 4 through the first cylindrical gear 5 and the second cylindrical gear 6 respectively. The loading unit is started to drive the transmission unit to run, and then the first cylindrical gear 5 and the second cylindrical gear 6 are driven to drive the input outer shaft 2 and the hollow upper shaft 4 to rotate. The hollow upper shaft 4 and the input outer shaft 2 are connected to the inner and outer rotor shafts of the coaxial twin-rotor reducer. The input outer shaft 2 and the hollow upper shaft 4 are in the form of hollow shafts. The input inner shaft 3 is sleeved in the axis of the input outer shaft 2 and the hollow upper shaft 4, and the input inner shaft 3 is fixed on the hollow upper shaft 4. In addition, the inner and outer double input shafts of the gearbox need to rotate in reverse to meet the reverse operation requirements of the rotor of the coaxial twin-rotor helicopter. The inner and outer rotor shafts of the coaxial twin-rotor helicopter reducer are vertical structures. In order to facilitate the connection of the loading test, the coaxial inner and outer double input shafts of the gearbox are also placed vertically. The loading test of the twin-rotor helicopter reducer is carried out by installing two loading motors 7. Due to the large size and load of the loading motor 7, the loading test bench can be better built by placing it horizontally, and the output double shafts of the gearbox are also placed horizontally.
[0017] Secondly, the output shaft 9 is arranged at one end of the housing 1, and the two ends of the coupling 8 are respectively fixedly connected to one end of the output shaft 9 and the output end of the loading motor 7. When the loading motor 7 is started, the output shaft 9 is driven to rotate through the connection of the coupling 8.
[0018] At the same time, the intermediate gear shaft 11 is arranged inside the housing 1, the bevel gear 10 is fixedly connected to the intermediate gear shaft 11 and sleeved on the outer wall of the intermediate gear shaft 11, the output shaft 9 is provided with bevel teeth 12, the bevel gear 10 is meshed with the bevel teeth 12, the intermediate gear shaft 11 is provided with a gear 13, and the first cylindrical gear 5 and the second cylindrical gear 6 are respectively meshed with the corresponding gears 13. The output shaft 9 rotates, driving the bevel gear 12 to rotate, and then meshing with the bevel gear 10, and then driving the intermediate gear shaft 11 to rotate, and the intermediate gear shaft 11 drives the gear 13 to rotate, and the two gears 13 cooperate with the corresponding first cylindrical gear 5 and the second cylindrical gear 6, and then respectively drive the input outer shaft 2 and the hollow upper shaft 4 to rotate; in addition, by adjusting the different arrangements of the bevel gears 10, the rotation direction of the coaxial internal and external inputs can be adjusted; the housing 1 is designed as an integral form to increase the support stiffness of the gear box; split tapered roller bearings are used on all vertically mounted shafts to reduce the difficulty of assembling the gear box; the rotation direction and position of the bevel gear 10 can be adjusted to apply the meshing axial force of the gear to the mounting plate at the bottom of the housing 1 to prevent the deformation of the housing 1 from affecting the meshing of the bevel gear 10.
[0019] In addition, the first spline sleeve 14 is arranged on the input outer shaft 2, the second spline sleeve 15 is arranged on the hollow upper shaft 4 and the input inner shaft 3, and the third spline sleeve 16 is arranged on the second spline sleeve 15 and the hollow upper shaft 4. The first spline sleeve 14 is movable. During installation, the first spline sleeve 14 is first moved upward to expose the inner shaft connection hole, and then the housing 1 is connected to the inner shaft of the rotor reducer, and then the first spline sleeve 14 is moved downward to connect the housing 1 to the outer shaft of the rotor reducer to perform a loading test; the second spline sleeve 15 and the third spline sleeve 16 connect the hollow upper shaft 4 and the input inner shaft 3, so that the input inner shaft 3 is suspended and fixed on the hollow upper shaft 4, thereby driving the input inner shaft 3 to rotate through the rotation of the hollow upper shaft 4, and finally driving the input outer shaft 2 and the input inner shaft 3 respectively, satisfying coaxial and internal and external drive.
[0020] Then, the middle box cover 17 is bolted to one side of the box body 1, and the upper box cover 18 is bolted to the top of the box body 1. The box body 1 can be opened easily through the middle box cover 17 and the upper box cover 18 to maintain and replace the internal parts.
[0021] When using a coaxial twin-rotor loading test gearbox of the present embodiment, the loading motor 7 is started, and through the connection of the coupling 8, the output shaft 9 is driven to rotate, so that the bevel gear 12 rotates and then meshes with the bevel gear 10, and then drives the intermediate gear shaft 11 to rotate, and the intermediate gear shaft 11 drives the gear 13 to rotate, and the two gears 13 cooperate with the corresponding first cylindrical gear 5 and the second cylindrical gear 6, and then respectively drive the input outer shaft 2 and the hollow upper shaft 4 to rotate; the hollow upper shaft 4 and the output The input outer shaft 2 is connected to the inner and outer rotor shafts of the coaxial twin-rotor reducer, the input outer shaft 2 and the hollow upper shaft 4 are in the form of hollow shafts, the input inner shaft 3 is sleeved in the axis of the input outer shaft 2 and the hollow upper shaft 4, and the input inner shaft 3 is fixed on the hollow upper shaft 4; through the above-mentioned structural setting, the loading units at both ends are driven simultaneously, and the settings of the hollow upper shaft 4 and the input outer shaft 2 are coordinated, so that it can be coaxial and driven inside and outside, and at the same time be placed vertically, thereby meeting all requirements of the coaxial twin-rotor reducer loading test.
[0022] What is disclosed above is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.
Claims
1. A coaxial twin-rotor loading test gearbox, characterized in that: It includes a housing, an input outer shaft, an input inner shaft, a hollow upper shaft, two loading units, two transmission units, a first cylindrical gear and a second cylindrical gear. The input outer shaft and the hollow upper shaft are both arranged inside the housing, the input inner shaft is arranged inside the input outer shaft and the hollow upper shaft, the two loading units are symmetrically arranged at both ends of the housing, the two transmission units are respectively arranged on the corresponding loading units, the first cylindrical gear is interference mounted on the input outer shaft, the second cylindrical gear is interference mounted on the hollow upper shaft, and the two transmission units are connected to the input outer shaft and the hollow upper shaft through the first cylindrical gear and the second cylindrical gear, respectively.
2. The coaxial twin-rotor loading test gearbox according to claim 1, characterized in that: The loading unit comprises a loading motor, a coupling and an output shaft. The output shaft is arranged at one end of the box body. Two ends of the coupling are fixedly connected to one end of the output shaft and the output end of the loading motor respectively.
3. The coaxial twin-rotor loading test gearbox according to claim 2, characterized in that: The transmission unit includes a bevel gear and an intermediate gear shaft, the intermediate gear shaft is arranged inside the housing, the bevel gear is fixedly connected to the intermediate gear shaft and sleeved on the outer wall of the intermediate gear shaft, the output shaft is provided with bevel teeth, the bevel gear is meshed with the bevel teeth, the intermediate gear shaft is provided with gears, and the first cylindrical gear and the second cylindrical gear are respectively meshed with the corresponding gears.
4. The coaxial twin-rotor loading test gearbox according to claim 3, characterized in that: The coaxial twin-rotor loading test gearbox also includes a first spline sleeve, a second spline sleeve and a third spline sleeve, wherein the first spline sleeve is arranged on the input outer shaft, the second spline sleeve is arranged on the hollow upper shaft and the input inner shaft, and the third spline sleeve is arranged on the second spline sleeve and the hollow upper shaft.
5. The coaxial twin-rotor loading test gearbox according to claim 4, characterized in that: The coaxial twin-rotor loading test gearbox further comprises a middle box cover and an upper box cover, wherein the middle box cover is bolted to one side of the box body, and the upper box cover is bolted to the top of the box body.