Rotor shaft tension bearing locking device and helicopter transmission system having the same

Abstract

The present invention discloses a rotor shaft tension bearing locking device and a helicopter transmission system having the same, comprising: a locking nut, a wedge, a threaded fastener, and a retaining ring. The locking nut is close to the tension bearing, and a wedge-shaped gap with a wedge-shaped cross section is formed between the two. The wedge is used to be installed in the wedge gap. The threaded fastener is used to fasten the wedge and the locking nut. During the fastening process, the wedge is radially wedged inward in the wedge gap, thereby causing the wedge to axially press the inner ring of the bearing, thereby causing the inner ring of the bearing to be axially locked between the locking device and the bearing shoulder on the rotor shaft. The retaining ring is connected to the outer circle of the rotor shaft and is connected to the outer end of the locking nut to prevent the locking nut from loosening. The device of the present invention is simple to assemble and disassemble, and does not require the use of complex tooling and processes. It is not easy to cause damage to the rotor shaft body during assembly and can reduce the load required by the operator during assembly, saving time and effort.

Description

Technical Field

[0001] The present invention relates to the technical field of helicopter transmission systems, and in particular to a rotor shaft tension bearing locking device. Furthermore, the present invention also relates to a helicopter transmission system having the rotor shaft tension bearing locking device. Background Art

[0002] The rotor shaft is generally supported by two bearings, one of which transmits axial force and is called a tension bearing. Whether the inner ring of the tension bearing can be effectively axially locked will directly affect the force transmission effect of the tension bearing, which is directly related to whether the rotor shaft and even the entire transmission system can work normally.

[0003] At present, the common axial locking method for the inner ring of the tension bearing is to use a large round nut coaxial with the bearing to apply the tightening torque to generate the axial compression force to lock the inner ring of the bearing to the bearing shoulder of the rotor shaft. The round nut is prevented from loosening by a washer and a retaining ring. Figure 1 shown.

[0004] With the development of helicopters, the diameter of the rotor shaft has gradually increased, and the diameter of the rotor shaft tension bearing has also increased accordingly. The axial clamping force required to lock the inner ring of the bearing has also become increasingly larger. The tightening torque required to lock the inner ring of the rotor shaft tension bearing of a large domestic helicopter has reached 12000N.m. Complex tooling and processes are required to achieve the required clamping effect. The large round nut is difficult to install and disassemble, and the rotor shaft body is easily damaged during the installation and disassembly process. Summary of the Invention

[0005] The present invention provides a rotor shaft tension bearing locking device and a helicopter transmission system having the same, so as to solve the technical problems existing in the existing locking device, that is, complicated tooling and processes are required to achieve the required clamping effect, the large round nut is difficult to install and remove, and the rotor shaft body is easily damaged during the installation and removal process.

[0006] The technical solution adopted in the present invention is as follows:

[0007] A rotor shaft tension bearing locking device is used to axially lock the inner ring of the tension bearing mounted on the outer circle of the rotor shaft. The locking device includes: a locking nut for threaded connection to the outer circle of the rotor shaft, a wedge-shaped piece for axially pressing against the outer end of the bearing inner ring after being subjected to force, a threaded fastener for connecting and tightening, and a stop ring for preventing the locking nut from loosening; the locking nut threadedly connected to the outer circle of the rotor shaft is close to the tension bearing, and the cross section formed between the two is A wedge-shaped wedge gap, a wedge piece is used to be installed in the wedge gap, a threaded fastener is used to fasten the wedge piece and the locking nut, and during the tightening process, the wedge piece is gradually wedged radially inward in the wedge gap, thereby pressing the inner ring of the bearing axially, thereby locking the inner ring of the bearing axially between the locking device and the bearing shoulder on the rotor shaft; a stop ring is connected to the outer circle of the rotor shaft and is connected to the outer end of the locking nut to stop the locking nut from loosening.

[0008] Furthermore, the cross-section of the wedge-shaped gap is a right-angled trapezoid, the right-angled base of the right-angled trapezoid is formed by the outer end face of the bearing inner ring, and the inclined top side is formed by processing the inner end face of the locking nut, and the flared end of the wedge-shaped gap is radially outward; the wedge piece includes a wedge-locking portion whose cross-section matches the cross-section of the wedge-shaped gap, and a connecting portion for connecting to the locking nut; the threaded fastener is radially penetrated through the connecting portion and threadedly connected to the locking nut to fix the wedge piece to the locking nut, and during the tightening process of the threaded fastener, the wedge-locking portion is radially wedged inward in the wedge-shaped gap through the connecting portion.

[0009] Furthermore, the wedge-shaped gap is a wedge-shaped annular groove extending along the circumference of the rotor shaft; the wedging portion is a wedge-shaped ring with an annular shape and a wedge-shaped cross-section; the connecting portion is an annular connecting ring, or a connecting piece arranged in sequence along the circumference of the wedge ring. The connecting ring or the connecting piece is respectively fixed to the outer end face of the wedge ring, and is used to tighten the outer ring surface of the locking nut under the action of the threaded fastener.

[0010] Furthermore, the wedge-shaped gap is a wedge-shaped groove that is arranged in sequence along the circumference of the locking nut and is formed by inward concave processing of the inner end face of the locking nut; the wedging portion is a wedge-shaped block whose cross-section matches the cross-section of the wedge-shaped groove; the connecting portion is a connecting piece fixed to the outer end face of the wedge block, and the connecting piece is used to tighten the outer ring surface of the locking nut under the action of the threaded fastener.

[0011] Furthermore, the threaded fastener includes a locking screw and an anti-loosening washer; a through hole is processed on the connecting ring or the connecting plate corresponding to the threaded fastener, and a threaded hole extending radially inward is processed on the outer ring surface of the locking nut corresponding to the through hole, and the screw rod of the locking screw is threadedly connected to the threaded hole after passing through the through hole radially; the anti-loosening washer is sleeved on the outer circle of the screw rod of the locking screw, and is located between the screw head of the locking screw and the connecting ring or the connecting plate, and the anti-loosening washer is also respectively connected to the screw head and the connecting ring or the connecting plate.

[0012] Furthermore, the anti-loosening washer includes a hollow annular washer ring body, and a plurality of deformable claws connected to the washer ring body in a circumferential direction at intervals; some of the deformable claws are bent along the first axial side to tighten the screw head, and the remaining deformable claws are bent along the second axial side to be inserted into the limiting holes opened on the connecting ring or connecting plate.

[0013] Furthermore, the outer end face of the locking nut is also connected to a convex strip extending in the circumferential direction, the inner end of the convex strip is fixed to the outer end face of the locking nut, and its relative outer end is extended axially and then bent radially to form an annular limiting ring groove between the outer end face of the locking nut and the outer end of the convex strip; the stopping ring is connected to the outer circle of the rotor shaft and is clamped in the limiting ring groove.

[0014] Furthermore, the stopping ring includes a stopping washer and an elastic retaining ring; the stopping washer is installed on the outer circle of the rotor shaft and is splined with the rotor shaft; the elastic retaining ring is sleeved on the rotor shaft and is located on the outside of the stopping washer, and the elastic retaining ring is also limited in the limiting ring groove to axially compress the stopping washer.

[0015] Furthermore, the convex strips are broken along the circumferential direction to form slots arranged in sequence along the circumferential direction; the stop washer includes a hollow cylindrical washer tube, a hollow disc-shaped gasket disk, and a plurality of limit plates; the washer tube is sleeved on the outer circle of the rotor shaft and spline-connected to the rotor shaft, and the elastic retaining ring is sleeved on the outer circle of the washer tube; the gasket disk is fixed on the outer ring of the gasket tube, and a plurality of limit plates are connected in sequence on the outer circumference of the gasket disk, and each limit plate is used to be clamped in the corresponding slot to prevent the dynamic washer from rotating in the circumferential direction.

[0016] According to another aspect of the present invention, a helicopter transmission system is also provided, comprising: a rotor shaft, tension bearings arranged axially in sequence on the outer circle of the rotor shaft, and a rotor shaft tension bearing locking device as described above; a convex and annular bearing shoulder is provided on the outer circle of the rotor shaft; the inner ring of the tension bearing is locked between the bearing shoulder and the rotor shaft tension bearing locking device by the rotor shaft tension bearing locking device.

[0017] The present invention has the following beneficial effects:

[0018] When assembling the rotor shaft tension bearing locking device of the present invention, first manually tighten the locking nut onto the outer circle of the rotor shaft, close to the outer end of the inner ring of the tension bearing also mounted on the outer circle of the rotor shaft, then install the stop ring on the outer circle of the rotor shaft close to the outer end of the locking nut, then place the wedge into the wedge-shaped gap, and then install the threaded fasteners, then use a torque wrench to symmetrically tighten the threaded fasteners to the specified value in pairs, and after all the threaded fasteners are tightened in place, the wedge is in Under the action of the threaded fastener, it is wedged radially inward in the wedge-shaped gap, that is, it is wedged between the inner end of the locking nut and the inner ring of the bearing, and then the inner ring of the bearing is pressed axially, so that the inner ring of the bearing is locked between the locking device of the present invention and the bearing shoulder set on the outer circle of the rotor shaft. When disassembly is required, it is only necessary to loosen the threaded fastener. Therefore, the locking device of the present invention is simple to assemble and disassemble, and the required tightening effect of the bearing inner ring can be achieved without the use of complicated tooling and processes, and it is not easy to cause damage to the rotor shaft body during assembly and disassembly.

[0019] On the other hand, when the wedge piece presses the inner ring of the bearing, in the absence of external force, the component of the positive pressure along the inclined surface of the wedge piece is less than the friction force on the wedge piece itself, which produces self-locking, such as Figure 11 As shown in the figure, F K Indicates the pressing force, F f1 =F N μ1, μ1 is the friction coefficient between the wedge and the locking nut. The wedge self-locking horizontal force meets the conditions shown in the formula: F N sinα-F f1 cosα-F f2 ≤0. The thrust of the wedge is provided by the axial preload generated when the threaded fastener is tightened, and the tension bearing is pressed by the wedging force generated when the wedge is wedged. Figure 11 As can be seen from the above formula, when tightening threaded fasteners, only a small tightening torque is needed to generate hundreds of times the axial preload, thereby reducing the load that the operator needs to apply during the final assembly, saving time and effort.

[0020] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 It is a schematic diagram of the existing tension bearing locking structure;

[0023] Figure 2 2. It is a schematic diagram of the cross-sectional front view of the rotor shaft tension bearing locking device according to a preferred embodiment of the present invention;

[0024] Figure 3 yes Figure 2 The schematic diagram of the partially enlarged structure at position Ⅰ in the middle;

[0025] Figure 4 yes Figure 2 Schematic diagram of the partially enlarged structure at middle II;

[0026] Figure 5 yes Figure 2 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0027] Figure 6 yes Figure 5 Schematic diagram of the main structure of the middle locking nut;

[0028] Figure 7 yes Figure 6 Schematic diagram of the cross-sectional structure in the middle DD direction;

[0029] Figure 8 yes Figure 2 Schematic diagram of the main structure of the stop washer;

[0030] Figure 9 yes Figure 8 AA-axis cross-sectional structural diagram;

[0031] Figure 10 yes Figure 2 Schematic diagram of the spatial structure of the middle wedge;

[0032] Figure 11 This is the self-locking force analysis diagram of the wedge.

[0033] Legend:

[0034] 10. Rotor shaft; 101. Bearing shoulder; 20. Tension bearing; 21. Bearing inner ring; 30. Locking nut; 301. Wedge groove; 302. Limiting ring groove; 303. Retaining groove; 31. Raised strip; 40. Wedge piece; 41. Wedging part; 42. Connecting part; 50. Threaded fastener; 51. Locking screw; 52. Anti-loosening washer; 60. Stop ring; 61. Stop washer; 62. Elastic retaining ring. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0036] Reference Figure 2-5A preferred embodiment of the present invention provides a rotor shaft tension bearing locking device for axially locking the bearing inner ring 21 of the tension bearing 20 mounted on the outer circle of the rotor shaft 10. The locking device includes: a locking nut 30 for threaded connection to the outer circle of the rotor shaft 10, a wedge-shaped member 40 for axially pressing against the outer end of the bearing inner ring 21 after being subjected to force, a threaded fastener 50 for connecting and tightening, and a stop ring 60 for preventing the locking nut 30 from loosening. A lock nut 30, threaded onto the outer circumference of rotor shaft 10, is positioned adjacent to tension bearing 20, forming a wedge-shaped gap with a wedge-shaped cross section between the two. A wedge 40 is fitted into this gap, and a threaded fastener 50 secures the wedge 40 to the lock nut 30. During the tightening process, the wedge 40 is gradually wedged radially inward into the gap, thereby axially pressing the wedge 40 against the bearing inner ring 21, thereby axially locking the bearing inner ring 21 between the locking device and the bearing shoulder 101 on rotor shaft 10. A retaining ring 60 is attached to the outer circumference of rotor shaft 10 and connected to the outer end of the lock nut 30, securing the lock nut 30 against loosening.

[0037] When assembling the rotor shaft tension bearing locking device of the present invention, first manually tighten the locking nut 30 onto the outer circle of the rotor shaft 10, and close to the outer end of the bearing inner ring 21 of the tension bearing 20 also mounted on the outer circle of the rotor shaft 10. Then, install the stop ring 60 on the outer circle of the rotor shaft 10 and close to the outer end of the locking nut 30. Then, place the wedge 40 into the wedge-shaped gap, and then install the threaded fasteners 50. Then, use a torque wrench to symmetrically tighten the threaded fasteners 50 to the specified value in pairs. After all the threaded fasteners 50 are tightened in place, the wedge is 40 is wedged radially inward in the wedge-shaped gap under the action of the threaded fastener 50, that is, it is wedged between the inner end of the locking nut 30 and the bearing inner ring 21, and then the bearing inner ring 21 is pressed axially, so that the bearing inner ring 21 is locked between the locking device of the present invention and the bearing shoulder 101 set on the outer circle of the rotor shaft 10. When disassembly is required, it is only necessary to loosen the threaded fastener 50. Therefore, the locking device of the present invention is simple to assemble and disassemble, and the required pressing effect of the bearing inner ring 21 can be achieved without the use of complicated tooling and processes, and it is not easy to cause damage to the rotor shaft body during assembly and disassembly.

[0038] On the other hand, when the wedge 40 presses the bearing inner ring 201, in the absence of external force, the component of the positive pressure along the inclined surface of the wedge 40 is less than the friction force on the wedge 40 itself, which produces self-locking. Figure 11 As shown in the figure, F K Indicates the pressing force, F f1 =F Nμ1, μ1 is the friction coefficient between the wedge 40 and the locking nut 30. The wedge 40 self-locks in the horizontal direction and the force meets the conditions shown in the formula: F N sinα-F f1 cosα-F f2 ≤0. The thrust of the wedge 40 is provided by the axial preload force generated when the threaded fastener 50 is tightened. The tension bearing 20 is pressed by the wedging force generated when the wedge 40 is wedged. Figure 11 As can be seen from the above formula, when the threaded fastener 50 is tightened, only a relatively small tightening torque is required to generate hundreds of times the axial preload, thereby reducing the load that the operator needs to apply during the final assembly, saving time and effort.

[0039] Alternatively, as Figure 4 As shown, the cross-section of the wedge-shaped gap is a right-angled trapezoid, with the right-angled base of the right-angled trapezoid formed by the outer end surface of the bearing inner ring 21 and the inclined top edge machined from the inner end surface of the lock nut 30. The flared end of the wedge-shaped gap faces radially outward. The wedge-shaped member 40 includes a wedge portion 41 whose cross-section matches that of the wedge-shaped gap, and a connecting portion 42 for connecting to the lock nut 30. A threaded fastener 50 radially penetrates the connecting portion 42 and is threadedly connected to the lock nut 30 to secure the wedge-shaped member 40 to the lock nut 30. During tightening of the threaded fastener, the connecting portion 42 causes the wedge portion 41 to be radially wedged inward into the wedge-shaped gap.

[0040] In this alternative embodiment, the first embodiment of the wedge member 40 and the wedge-shaped gap is not shown. The wedge-shaped gap is a wedge-shaped annular groove extending along the circumference of the rotor shaft 10. The wedging portion 41 is an annular wedge ring with a wedge-shaped cross-section. The connecting portion 42 is an annular connecting ring or connecting plates arranged sequentially along the circumference of the wedge ring. The connecting rings or connecting plates are respectively fixed to the outer end surface of the wedge ring and are used to tighten against the outer annular surface of the lock nut 30 under the action of the threaded fastener 50. In this alternative embodiment, the wedge member 40 is a single-piece component, which is easy to install and remove.

[0041] In this optional solution, the second embodiment of the wedge 40 and the wedge gap 304, such as Figure 4-5 and Figure 10 As shown, the wedge-shaped gaps are wedge-shaped grooves 301 spaced sequentially along the circumference of the lock nut 30 and formed by inwardly processing the inner end surface of the lock nut 30. The wedging portion 41 is a wedge-shaped block with a cross-section that matches the cross-section of the wedge-shaped groove 301. The connecting portion 42 is a connecting piece fixed to the outer end surface of the wedge block, which is used to tighten against the outer annular surface of the lock nut 30 under the action of the threaded fastener 50. In this optional solution, the wedge member 40 is a multiple-piece component, which facilitates the processing and preparation of the individual components.

[0042] Preferably, if Figure 6As shown, in the first and second embodiments of the wedge-shaped member 40 and the wedge-shaped gap 304, the contact surface of the lock nut 30 for contacting the connecting piece is flat, so that the connecting portion 42 is in close contact with the outer annular surface of the lock nut 30. Furthermore, the number of groups of threaded fasteners 50 is even, evenly spaced along the circumference of the lock nut 30. When tightening the threaded fasteners 50, the two groups of threaded fasteners 50 corresponding to the two ends of the diameter are tightened simultaneously, thereby uniformly applying circumferential force to the wedge 40 and improving the circumferential force effect on the bearing inner ring 21.

[0043] Alternatively, as Figure 4 and Figure 10 As shown, the threaded fastener 50 includes a locking screw 51 and a lock washer 52. A through-hole is machined through the connecting ring or connecting plate at a location corresponding to the threaded fastener 50. A threaded hole extending radially inward is machined on the outer surface of the locking nut 30 at a location corresponding to the through-hole. The shank of the locking screw 51 radially extends through the through-hole and is then threadedly connected to the threaded hole. The lock washer 52 is fitted over the outer circumference of the shank of the locking screw 51 and positioned between the screw head of the locking screw 51 and the connecting ring or connecting plate. The lock washer 52 also connects the screw head and the connecting ring or connecting plate.

[0044] Preferably, the locking washer 52 comprises a hollow, annular washer body and a plurality of deformable claws spaced circumferentially around the washer body. Some of the deformable claws are bent along a first axial side to securely grip the screw head, while the remaining deformable claws are bent along a second axial side to insert into retaining holes defined in the connecting ring or connecting piece. Thus, the locking washer 52 securely connects and secures the locking screw 51 and the wedge 40, effectively preventing the locking screw 51 from loosening under stress. This improves the tightening effect of the threaded fastener 50 on the wedge 40 and the locking nut 50, ultimately ensuring the axial locking effect of the bearing inner ring 21.

[0045] Alternatively, as Figure 3-7 As shown, the outer end surface of the lock nut 30 is further connected to a circumferentially extending protrusion 31. The inner end of the protrusion 31 is fixed to the outer end surface of the lock nut 30, and its opposite outer end extends axially and then bends radially to form an annular retaining groove 302 between the outer end surface of the lock nut 30 and the outer end of the protrusion 31. A retaining ring 60 is connected to the outer circumference of the rotor shaft 10 and is clamped in the retaining groove 302, effectively preventing the lock nut 30 from loosening under stress.

[0046] In this option, if Figure 3-4As shown, retaining ring 60 includes a retaining washer 61 and a circlip 62. Retaining washer 61 is mounted on the outer circumference of rotor shaft 10 and splined to rotor shaft 10. Circlip 62 is fitted onto rotor shaft 10 and positioned outside retaining washer 61. Circlip 62 is also retained in retaining ring groove 302 to axially compress retaining washer 61. After installation, retaining washer 61 is circumferentially retained and axially movable. The circlip 62 compresses retaining washer 61 axially, effectively preventing axial slippage.

[0047] Preferably, if Figure 6 、 Figure 8-9 As shown, the ridges 31 are circumferentially interrupted to form slots 303 spaced sequentially along the circumference. The retaining washer 61 comprises a hollow cylindrical washer barrel, a hollow disc-shaped shim plate, and multiple retaining plates. The washer barrel fits over the outer circumference of the rotor shaft 10 and is splined to the rotor shaft 10. The circlip 62 fits over the outer circumference of the washer barrel. The shim plate is fixed to the outer ring of the washer barrel. Multiple retaining plates are spaced sequentially around the outer circumference of the shim plate, each retaining plate being designed to engage a corresponding slot 303 to prevent the dynamic washer 61 from rotating circumferentially.

[0048] Reference Figure 2 A preferred embodiment of the present invention also provides a helicopter transmission system, characterized by comprising: a rotor shaft 10, tension bearings 20 sequentially mounted axially on the outer circumference of the rotor shaft 10, and any of the aforementioned rotor shaft tension bearing locking devices. The outer circumference of the rotor shaft 10 includes a convex, annular bearing shoulder 101. The inner bearing ring 21 of the tension bearing 20 is locked between the bearing shoulder 101 and the rotor shaft tension bearing locking device by the rotor shaft tension bearing locking device. The helicopter transmission system of the present invention, because it utilizes any of the aforementioned rotor shaft tension bearing locking devices, is simple to assemble and disassemble. The desired compression of the bearing inner ring 21 can be achieved without the use of complex tooling and processes, and the rotor shaft body is less likely to be damaged during assembly and disassembly. Furthermore, when tightening the threaded fastener 50, only a relatively small tightening torque is required to generate hundreds of times the axial preload, thereby reducing the load required by the operator during final assembly and saving time and effort.

[0049] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A rotor shaft tension bearing locking device for axially locking an inner ring (21) of a tension bearing (20) mounted on the outer circle of a rotor shaft (10), characterized in that: The locking device includes: A locking nut (30) for threaded connection to the outer circle of the rotor shaft (10), a wedge-shaped member (40) for axially pressing against the outer end of the bearing inner ring (21) after receiving force, a threaded fastener (50) for connecting and fastening, and a stop ring (60) for preventing the locking nut (30) from loosening; A locking nut (30) threadedly connected to the outer circle of the rotor shaft (10) is close to the tension bearing (20), and a wedge-shaped gap with a wedge-shaped cross section is formed between the two. The wedge-shaped piece (40) is used to be installed in the wedge-shaped gap. The threaded fastener (50) is used to fasten the wedge-shaped piece (40) and the locking nut (30), and during the fastening process, the wedge-shaped piece (40) is gradually wedged in the wedge-shaped gap in the radial direction inward, thereby causing the wedge-shaped piece (40) to axially press the bearing inner ring (21), thereby causing the bearing inner ring (21) to be axially locked between the locking device and the bearing shoulder (101) on the rotor shaft (10); The stop ring (60) is connected to the outer circle of the rotor shaft (10) and is connected to the outer end of the locking nut (30) to prevent the locking nut (30) from loosening; The outer end surface of the locking nut (30) is further connected to a circumferentially extending protrusion (31), the inner end of the protrusion (31) is fixed to the outer end surface of the locking nut (30), and the opposite outer end thereof is extended in the axial direction and then bent in the radial direction to form an annular limiting ring groove (302) between the outer end surface of the locking nut (30) and the outer end of the protrusion (31); The stop ring (60) is connected to the outer circle of the rotor shaft (10) and is clamped in the limiting ring groove (302); The stop ring (60) includes a stop washer (61) and an elastic retaining ring (62); The stop washer (61) is mounted on the outer circle of the rotor shaft (10) and is spline-connected to the rotor shaft (10); The elastic retaining ring (62) is sleeved on the rotor shaft (10) and is located outside the stop washer (61), and the elastic retaining ring (62) is also limited in the limiting ring groove (302) to axially press the stop washer (61).

2. The rotor shaft tension bearing locking device according to claim 1, characterized in that: The cross section of the wedge-shaped gap is a right-angled trapezoid, the right-angled bottom side of the right-angled trapezoid is formed by the outer end face of the bearing inner ring (21), the inclined top side is formed by machining the inner end face of the locking nut (30), and the flared end of the wedge-shaped gap is radially outward; The wedge-shaped member (40) includes a wedging portion (41) whose cross section matches the cross section of the wedge-shaped gap, and a connecting portion (42) for connecting to the locking nut (30); The threaded fastener passes through the connecting portion (42) in the radial direction and is threadedly connected to the locking nut (30) to fix the wedge-shaped member (40) and the locking nut (30). During the tightening process of the threaded fastener, the wedging portion (41) is wedged radially inward in the wedge-shaped gap through the connecting portion (42).

3. The rotor shaft tension bearing locking device according to claim 2, characterized in that: The wedge-shaped gap is a wedge-shaped annular groove extending along the circumference of the rotor shaft (10); The wedging portion (41) is an annular wedge ring with a wedge-shaped cross section; The connecting portion (42) is an annular connecting ring or connecting sheets arranged at intervals along the circumference of the wedge ring. The connecting ring or connecting sheet is respectively fixed to the outer end surface of the wedge ring and is used to tighten the outer ring surface of the locking nut (30) under the action of the threaded fastener (50).

4. The rotor shaft tension bearing locking device according to claim 2, characterized in that: The wedge-shaped gaps are wedge-shaped grooves (301) that are sequentially spaced along the circumference of the locking nut (30) and are formed by inwardly concave processing of the inner end surface of the locking nut (30); The wedging portion (41) is a wedge-shaped block whose cross section matches the cross section of the wedge-shaped groove (301); The connecting portion (42) is a connecting piece fixed to the outer end surface of the wedge block, and the connecting piece is used to be tightly attached to the outer ring surface of the locking nut (30) under the action of the threaded fastener (50).

5. The rotor shaft tension bearing locking device according to any one of claims 3 or 4, characterized in that: The threaded fastener (50) includes a locking screw (51) and a locking washer (52); A through hole is machined on the connecting ring or the connecting piece at a position corresponding to the threaded fastener (50), a threaded hole extending radially inward is machined on the outer ring surface of the locking nut (30) at a position corresponding to the through hole, and the screw rod of the locking screw (51) is threadedly connected to the threaded hole after radially penetrating the through hole; The anti-loosening washer (52) is sleeved on the outer circle of the screw rod of the locking screw (51) and is located between the screw head of the locking screw (51) and the connecting ring or the connecting piece, and the anti-loosening washer (52) is also connected to the screw head and the connecting ring or the connecting piece respectively.

6. The rotor shaft tension bearing locking device according to claim 5, characterized in that: The anti-loosening washer (52) comprises a hollow annular washer ring body and a plurality of deformable claws sequentially connected to the washer ring body in a circumferential direction at intervals; Part of the deformable claws is bent along the first axial side to wrap the screw head, and the remaining part of the deformable claws is bent along the second axial side to be inserted into the limiting hole opened on the connecting ring or the connecting piece.

7. The rotor shaft tension bearing locking device according to claim 1, characterized in that: The convex strips (31) are broken along the circumferential direction to form slots (303) arranged in sequence along the circumferential direction; The stop washer (61) comprises a hollow cylindrical washer tube, a hollow disc-shaped washer disc, and a plurality of limiting plates; The washer tube is sleeved on the outer circle of the rotor shaft (10) and is spline-connected to the rotor shaft (10), and the elastic retaining ring (62) is sleeved on the outer circle of the washer tube; The gasket disc is fixed on the outer ring of the gasket cylinder, and a plurality of limiting plates are sequentially connected to the outer periphery of the gasket disc at intervals, and each limiting plate is used to be clamped in a corresponding clamping groove (303) to prevent the dynamic gasket (61) from rotating in the circumferential direction.

8. A helicopter transmission system, characterized in that: include: A rotor shaft (10), tension bearings (20) sequentially arranged along the axial direction on the outer circle of the rotor shaft (10), and a rotor shaft tension bearing locking device according to any one of claims 1 to 7; The outer circle of the rotor shaft (10) is provided with an outwardly convex and annular bearing shoulder (101); The bearing inner ring (21) of the tension bearing (20) is locked between the bearing shoulder (101) and the rotor shaft tension bearing locking device through the rotor shaft tension bearing locking device.

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