Reverse thread self-locking assembly

Abstract

Provided is a reverse thread self-locking assembly for axially locking a component on the outer periphery of a shaft, comprising a locking nut, a check ring and an anti-rotation ring, the locking nut comprising an annular body and a shaft neck outer ring extending axially from the annular body, the annular body comprising a first inner threaded surface, the shaft neck outer ring comprising a second inner threaded surface and a ring groove, the first inner threaded surface being configured to threadedly engage the outer periphery of the shaft; the check ring is engaged with the ring groove; the anti-rotation ring is arranged between the check ring and the annular body and comprises an outer peripheral surface configured to threadedly engage the second inner threaded surface; wherein the threads of the first inner threaded surface and the second inner threaded surface are arranged in opposite directions. The above-mentioned assembly can achieve the axial locking effect on the axial component.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aero-engines, in particular to a mechanical locking positioning device. BACKGROUND

[0002] The aero-engine is the power device of the aircraft and is one of the determinants of the performance of the aircraft, and is called the heart of the aircraft. The transmission system is the source of power of the aero-engine, and it not only needs to transmit torque but also needs to transmit axial force, even needs to transmit radial force and other various loads. The transmission gear box is a key component of the aero-engine, as a kinetic energy conversion device, it drives the normal operation of the starting system, fuel system, oil system, power generation system, hydraulic system and other main accessories of the aero-engine, and its performance directly affects the operation of the aero-engine.

[0003] With the further development of the aero-engine, the structure of the transmission aero-engine is developing towards the gear transmission engine, variable cycle engine, multi-electric engine, inter-cooled regenerative engine and open rotor engine. With the continuous improvement of the performance indicators of the aero-engine, the rotational speed and input power of the gear box components are becoming larger and larger, and therefore the load bearing of the transmission system in the gear box components is gradually increasing.

[0004] The transmission gear box mainly adopts gear meshing and spline matching structure, and the gear shaft is supported and positioned by bearings. The bearings supporting the gear shaft and the gears meshing with the gear shaft generally need to be axially locked. The traditional gear or bearing locking positioning device is a deformation locking device, which relies on the locking sheet that occurs plastic deformation to complete the locking of the gear or bearing with the nut. However, this method has the problems of complex installation process, high disassembly difficulty and high replacement cost. SUMMARY

[0005] An object of the present application is to provide a reverse thread self-locking assembly.

[0006] To achieve the above-mentioned object, the reverse thread self-locking assembly for axially locking the component located on the outer periphery of the shaft comprises a locking nut, a check ring and an anti-rotation ring. The locking nut comprises an annular body and a journal outer ring extending axially from the annular body. The annular body comprises a first internal thread surface, and the journal outer ring comprises a second internal thread surface and a ring groove. The first internal thread surface is used for thread matching with the outer periphery of the shaft. The check ring is engaged with the ring groove. The anti-rotation ring is arranged between the check ring and the annular body and comprises an outer peripheral surface for thread matching with the second internal thread surface. The threads of the first internal thread surface and the second internal thread surface are reversely arranged.

[0007] In one or more embodiments, the anti-rotation ring further comprises an inner peripheral surface, and the inner peripheral surface is provided with a positioning pin. The outer periphery of the shaft is provided with an anti-rotation groove matched with the positioning pin.

[0008] In one or more embodiments, the inner circumferential surface is provided with a positioning hole for accommodating the positioning pin, and the positioning hole is further provided with an elastic member matched with the positioning pin.

[0009] In one or more embodiments, the positioning pin comprises a head and a pin rod, the head is located at the inner side in the radial direction, and the elastic member is sleeved on the outer circumferential surface of the pin rod.

[0010] In one or more embodiments, the head comprises a positioning anti-rotation inclined surface, and the anti-rotation ring comprises a matched inclined surface matched with the positioning anti-rotation inclined surface.

[0011] In one or more embodiments, the assembly further comprises a bushing, which is detachably arranged in the inner circumferential surface of the anti-rotation ring and radially extrudes the positioning pin.

[0012] In one or more embodiments, the shaft neck outer ring of the locking nut further comprises a notch.

[0013] In one or more embodiments, the component comprises a bearing and / or a gear.

[0014] In one or more embodiments, the retainer ring is made of elastic material.

[0015] In one or more embodiments, the anti-rotation ring is provided with an operation notch.

[0016] The above reverse thread self-locking assembly is matched with the gear shaft through the locking nut through threads, and is locked and positioned through the locking nut and the retainer ring located on the axial two sides of the anti-rotation ring, the reverse thread structure itself has a reverse restriction effect, the two-way stress is mutually offset, is relatively static, has a starting locking effect, and further makes the assembly itself generate self-locking, so that the locking and positioning effect is realized. In addition, the above locking and positioning device can be conveniently disassembled, repeatedly used, and further adjusted in a small amount. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and other features, properties, and advantages of the present application will become more apparent by describing in the following description, taken in conjunction with the accompanying drawings and embodiments, in which:

[0018] Figure 1 is a schematic diagram of a traditional locking and positioning structure;

[0019] Figure 2 is a schematic diagram of the installation position of the axial locking and positioning assembly;

[0020] Figure 3 is a schematic diagram of the whole axial locking and positioning assembly;

[0021] Figure 4is the structural diagram of the lock nut;

[0022] Figure 5 is the structural diagram of the anti-rotation ring;

[0023] Figure 6 is the diagram of the positioning pin;

[0024] Figure 7 is the diagram of the bushing and the anti-rotation ring in the cooperating state;

[0025] Figure 8 is the diagram of the lock nut and the gear shaft locking;

[0026] Figure 9 is the diagram of the lock nut after being installed into the anti-rotation ring and the bushing;

[0027] Figure 10 is the diagram of the positioning pin engaging the gear shaft;

[0028] Figure 11 is the diagram of the stop ring after being installed into the lock nut;

[0029] Figure 12 is Figure 11 is the enlarged view of A in FIG. 8;

[0030] Figure 13 is the principle diagram of the double reverse thread self-locking;

[0031] Figure 14 is the force analysis diagram of the double reverse thread self-locking. DETAILED DESCRIPTION

[0032] The present application will be further described below in conjunction with specific embodiments and the accompanying drawings, and more details are set forth in the following description in order to fully understand the present application, but the present application can be implemented in many different ways other than the description, and those skilled in the art can make similar generalizations and deductions according to the actual application without departing from the spirit of the present application, therefore the protection scope of the present application should not be limited by the specific embodiments.

[0033] It should be noted that these and other subsequent drawings are only examples, and are not drawn according to the condition of the same scale, and should not be used as a limitation on the actual protection scope required by the present application.

[0034] As Figure 1As shown, the deformation locking device used by the gear box accessory of the conventional structure is in threaded cooperation between the nut 1 and the gear shaft 4, and the axial locking is achieved by the cooperation between the locking sheet and the nut 1, and the rotation prevention is achieved by the plastic deformation of the locking sheet. After assembly, it cannot be adjusted, the assembly times are limited, and generally after 2 times of assembly, the locking sheet needs to be replaced. Therefore, this axial locking method has the disadvantages of high replacement cost and weak workpiece independence, and at the same time, due to the limitation of the harsh operation space conditions, it is also prone to inaccurate positioning and easy loosening. In addition, other locking positioning devices sometimes cannot be accurately locked or are limited by the limited space, and the locking is not in place.

[0035] The reverse thread self-locking assembly 3 described in the present disclosure is used to achieve the axial self-locking function by means of the reverse thread, and then the components located on the outer periphery of the shaft are axially locked. The shaft includes but is not limited to shafts such as gear shafts 4, and the components on the outer periphery include but are not limited to bearings (not shown in the figure) and / or gears and other components sleeved on the outer periphery of the shaft. In the following, the reverse thread self-locking assembly 3 will be further introduced by taking the gear shaft 4 and the positioning gear 5 as examples.

[0036] Referring to Figures 2-3 As shown, the reverse thread self-locking assembly 3 includes a locking nut 301, an anti-rotation ring 302, and a retaining ring 304.

[0037] The locking nut 301, as shown in Figure 4 includes an annular body 311 and a journal outer ring 312 extending axially from the annular body 311, and the annular body 311 includes a first internal thread surface 313, and the journal outer ring 312 includes a second internal thread surface 314 and a ring groove 315, and the first internal thread surface 313 is used for threaded cooperation with the outer periphery of the gear shaft 4. The locking nut 301 as the main part of the reverse thread self-locking assembly 3 is in an annular structure, and the locking nut 301 is sleeved on the outer periphery of the gear shaft 4, and the positioning gear 5 to be locked is located on the axial side thereof.

[0038] The retaining ring 304 is clamped with the ring groove 315 on the journal outer ring 312.

[0039] The anti-rotation ring 302 is arranged between the retaining ring 304 and the annular body 311, as shown in Figure 5 includes an outer peripheral surface 321 for threaded cooperation with the second internal thread surface 314. That is, the annular body 311, the anti-rotation ring 302, and the retaining ring 304 are sequentially distributed along the axial direction, as shown in Figure 11 and Figure 12 .

[0040] Among them, the threads of the first internal thread surface 313 and the second internal thread surface 314 are reversely arranged, so that the threads of the first internal thread surface 313 and the gear shaft 4 cooperation surface, and the threads of the second internal thread surface 314 and the anti-rotation ring 302 cooperation surface are reversely arranged.

[0041] Thus, when the thread is loose, the rotation direction of the annular body 311 and the retaining ring 304 and the rotation direction of the anti-rotation ring 302 are opposite, and the anti-rotation ring 302 is axially limited by the annular body 311 and the retaining ring 304, the retaining ring 304 is assembled in the annular groove 315 on the shaft neck outer ring 312, effectively preventing the axial distance between the lock nut 301 and the anti-rotation ring 302 from becoming larger, thereby preventing the lock nut 301 from loosening, achieving the locking purpose. Therefore, the reverse thread self-locking assembly 3 can fully utilize the characteristics of the reverse thread to achieve self-locking, thereby fixing the relative distance position, which is convenient, reliable and stable.

[0042] The retaining ring 304 is preferably made of elastic material, which is convenient to disassemble.

[0043] In Figure 4 In the embodiment shown, the shaft neck outer ring 312 of the lock nut 301 further includes a notch 317 for observing the assembly of each component. In this way, the anti-rotation ring 302, the retaining ring 304 and the like are all contained inside the lock nut 301, which has good containment and effectively saves space in the gear box; it is also beneficial to the circulation of the gear box oil and reduces the oil splashing phenomenon, thereby effectively reducing the temperature of the gear box, and at the same time, effectively reducing the vibration of the gear box.

[0044] In some embodiments, the anti-rotation ring 302 further includes an inner circumferential surface 322, and the inner circumferential surface 322 is provided with a positioning pin 324, and the outer circumferential side of the gear shaft 4 is provided with an anti-rotation groove (not shown in the figure) matched with the positioning pin 324. The inner circumferential surface 322 is provided with a positioning hole accommodating the positioning pin 324, and the positioning hole 325 is further provided with an elastic member 326 matched with the positioning pin, as shown in Figures 5-6

[0045] The positioning pin 324 includes a head 3242 and a pin rod 3241, and the head 3242 is located on the radially inner side, and the elastic member 326 is sleeved on the outer circumferential surface of the pin rod 3241, and the anti-rotation pin 324 is pushed out of the positioning hole 325 by using the elasticity itself. The head 3242 includes a positioning anti-rotation inclined surface 3243, and the anti-rotation ring 302 includes a matching inclined surface 3245 matched with the positioning anti-rotation inclined surface 3243, and the matching inclined surface 3245 is provided by a boss 327, and the cooperation of the two inclined surfaces limits the radial movement of the head 324, and limits the maximum radial displacement of the positioning pin 324, as shown in Figure 6

[0046] In order to realize the extension and contraction of the positioning pin 324, the assembly further includes a bushing 303 which is detachably arranged in the inner circumferential surface 322 of the anti-rotation ring 302, as shown in Figure 7 ​​As shown, the anti-rotation ring 302 is provided with a bushing 303, and the positioning pin 324 is radially extruded. In this way, the bushing 303 is extruded against the inner circumferential surface 322, and the positioning pin 324 is extruded into the positioning hole 325. When the bushing 303 is removed, the positioning pin 324 is radially extruded under the action of the elasticity 326, and is matched with the anti-rotation groove on the gear shaft 4 to perform anti-rotation positioning. The traditional locking nut device is no longer used to rotate the angle of the locking nut, and the anti-rotation positioning between the locking piece and the gear shaft is adjusted.

[0047] When the reverse thread self-locking assembly 3 is installed on the gear shaft 4, the bushing 303 is first installed in the anti-rotation ring 302, so that the bushing 303 and the anti-rotation ring 302 form an integral piece. The gear shaft 4 is inserted into the inside of the bushing 303, and is screwed into the locking nut 301 through the thread, as shown. Figure 9 Since it is a threaded connection, only the position of the anti-rotation pin corresponding to the anti-rotation groove on the gear shaft 4 needs to be considered, and the adjustment is free. The locking nut 301 does not need to be rotated again, so accurate positioning of locking can be achieved.

[0048] Subsequently, the bushing 303 is removed, and the positioning pin 324 is radially extruded under the action of the elasticity 326 and is clamped into the anti-rotation groove on the gear shaft 4. In this way, the cooperation of the positioning pin 324, the elasticity 326 and the bushing 303 uses the spring to push the anti-rotation pin to cooperate with the anti-rotation groove on the gear shaft to perform anti-rotation and stop, and the assembly of the reverse thread self-locking assembly is completed.

[0049] When the anti-rotation ring 302 is disassembled, the bushing 303 needs to be installed in the anti-rotation ring 302 to prevent the positioning pin 324 from being extruded and to release the anti-rotation function. Then the locking nut 301 is rotated, the gear shaft assembly is disassembled, and the disassembly is completed.

[0050] In this way, the four parts of the reverse thread self-locking assembly each play a specific role: the locking nut 301 and the gear shaft 301 are threaded together; the anti-rotation ring 302 is threaded with the locking nut 301, and can be axially moved freely by rotation. The bushing 303 plays a role in protecting and limiting the positioning pin 324 before installation, and also plays a role in limiting the positioning pin 324 when disassembly; the retaining ring 304 is assembled in the ring groove 315 of the locking nut 301, and cooperates with the annular body 311 of the locking nut 301 to axially position the anti-rotation ring 302, prevent the anti-rotation ring 302 from moving axially in the opposite direction between the locking nut 301 and the anti-rotation ring 302, and realize the self-locking function by virtue of the reverse threads of the first inner threaded surface 313 and the second inner threaded surface 314.

[0051] As shown in Figure 13 and Figure 14For example, the locking nut 301 is right-handed threaded to the gear shaft 4, and the anti-rotation ring 302 is left-handed threaded to the locking nut 301. When the connection between the locking nut 301 and the gear shaft 4 is loose, the anti-rotation ring 302 will rotate left away from the locking nut 301, resulting in the locking failure, causing the anti-rotation ring 302 to exit relative to the second inner threaded surface of the locking nut 301, and causing the locking nut 301 to move away from the anti-rotation ring assembly 302. At this time, the stop ring 304 axially limits the anti-rotation ring 302.

[0052] Figure 14 The force analysis of the anti-rotation ring 302 is shown. When the locking nut 301 is locked, the anti-rotation ring 302 moves away from the locking nut 301. The left-handed threaded force principle is as follows: when the threaded force F is applied, it is decomposed into a radial force F1 and an axial force F2. The F1 is counteracted by the reaction force of the positioning pin 324, and the F2 is counteracted by the reaction force of the stop ring 304, so that the rotation cannot continue to occur, and finally the locking nut 301 cannot be loosened, achieving 360-degree non-angle difference locking, and ensuring that the gear shaft and the entire gear shaft remain in a relatively static state.

[0053] In some embodiments, the anti-rotation ring 302 is further provided with a plurality of operation notches 329, as shown in Figure 5 for facilitating the installation and separation of the bushing 303.

[0054] In summary, the reverse thread self-locking assembly has the following advantages: the locking positioning device object matching part adopts threaded connection, and the deformation of the matching shaft is small under the influence of heat in the working state, the deformation amount of the gear shaft is small under high speed, and the dynamic balance value is small, thereby reducing vibration, prolonging the service life of the bearing, and reducing the temperature rise of the locking positioning device; the threaded structure also has a certain sealing effect, effectively plays a role of blocking oil flow, effectively prevents the occurrence of a closed oil cavity, and thereby effectively reduces the risk of damage to related parts caused by an increase in oil temperature; the anti-rotation pin of the anti-rotation device is continuously pressed and contacted by the spring, and the anti-rotation effect can be continuously and effectively achieved, and the radial uniform stress of the threaded connection can also be maintained, thereby preventing uneven stress on the threads and damage to the threads; since the connecting threads between the nut and the shaft are right-handed threads, the connecting threads between the anti-rotation device and the locking nut are left-handed threads, the two threads are reverse, and the reverse threaded structure has a reverse restraint effect, the two forces are offset, and the relative position is relatively static, thereby achieving the locking effect; compared with the traditional method, the use and replacement frequency of the locking piece are avoided, and the angle requirement of the internal clasp locking piece is avoided, the locking device is matched with the locking device, the reverse double-thread restraint characteristic is fully utilized, the relative position between the locking nut and the anti-rotation device is kept absolutely static, the axial looseness of the locking device to the gear shaft is eliminated, assembly is simple, the operation environment (space) requirement is low when disassembling, replacement is easy, the position of the gear or bearing is accurately locked after installation, the installation time is shortened, the working stability of the gear shaft is improved, even in the high-speed running working condition, the situation that the positioning device fails due to thread loosening between parts is avoided, and the reliability of the positioning device is improved.

[0055] The present application uses specific words to describe the embodiments of the present application. As "one embodiment", "an embodiment", and / or "some embodiments" means a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that the "an embodiment" or "one embodiment" or "an alternative embodiment" mentioned in different places in the specification does not necessarily refer to the same embodiment. In addition, certain features, structures or characteristics in one or more embodiments of the present application can be properly combined.

[0056] Although the present application is disclosed with the preferred embodiments as above, it is not intended to limit the present application, and any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present application. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, which does not deviate from the technical solution of the present application, falls within the protection scope defined by the claims of the present application.

Claims

1. A reverse thread self-locking assembly for axially locking a component located on the outer periphery of a shaft, characterized in that, The assembly comprises: a lock nut comprising an annular body and a journal outer ring extending axially from the annular body, the annular body comprising a first internally threaded surface for cooperating with an external thread of the shaft, and the journal outer ring comprising a second internally threaded surface and an annular groove; a retainer ring engaging the annular groove; and an anti-rotation ring disposed between the retainer ring and the annular body, comprising an external circumferential surface for cooperating with the second internally threaded surface; wherein the first and second internally threaded surfaces are oppositely threaded; the anti-rotation ring further comprising an internal circumferential surface having a positioning pin disposed thereon, the external circumferential side of the shaft having an anti-rotation groove for cooperating with the positioning pin; the internal circumferential surface having a positioning hole for receiving the positioning pin, the positioning hole further having a resilient member for cooperating with the positioning pin; the positioning pin comprising a head portion and a pin stem, the head portion being disposed radially inwardly, the resilient member being disposed around the pin stem; the head portion comprising a positioning anti-rotation bevel, the anti-rotation ring comprising a cooperating bevel for cooperating with the positioning anti-rotation bevel.

2. The reverse-thread self-locking assembly of claim 1, wherein, The assembly further comprises a bushing being removably disposed within the internal circumferential surface of the anti-rotation ring and radially compressing the positioning pin.

3. The reverse-thread self-locking assembly of claim 1, wherein, The journal outer ring of the lock nut further comprises a notch.

4. The reverse-thread self-locking assembly of claim 1, wherein, The component comprises a bearing and / or a gear.

5. The reverse-thread self-locking assembly of claim 1, wherein, The retainer ring is made of an elastic material.

6. The reverse-thread self-locking assembly of claim 1, wherein, The anti-rotation ring has an operating notch disposed thereon.

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