Aircraft transmission long shaft bearing damping mechanism

Abstract

The utility model discloses an aircraft transmission long shaft bearing vibration reduction mechanism in the technical field of airplanes, which comprises a long shaft, a bearing inner ring, a needle bearing and a rack seat are sequentially sleeved on the long shaft from inside to outside, a rubber mounting hole is arranged on a lug plate on the periphery of the rack seat, vibration reduction rubber is arranged in the rubber mounting hole, and the vibration reduction rubber is arranged in the rack seat. The damping device solves the problem that in the prior art, debonding is caused by vibration, and therefore the damping performance is affected.

Description

Technical Field

[0001] The utility model relates to the technical field of aircraft, in particular to an aircraft transmission long shaft. Background Art

[0002] At present, shafts and bearings are often subject to vibration interference of various frequencies and amplitudes during the flight of an aircraft. These vibrations will have different negative impacts on the operation of shafts and bearings, mainly including the following aspects.

[0003] 1. Reduced bearing life: Long-term vibration will lead to increased wear inside the bearing, thereby reducing the bearing life and affecting the operation of the transmission system and the normal flight of the aircraft.

[0004] 2. Damage to bearings. When the vibration is too large, the load on the bearing exceeds the bearing's limit load, causing bearing damage or even complete failure, affecting the safety of aircraft flight.

[0005] 3. Cause shaft resonance. When the external vibration frequency coincides with the torsional natural frequency of the shaft, the deformation of the shaft will increase rapidly, to the extent that the shaft or even the entire machine is damaged.

[0006] Vibration is an inevitable part of mechanical equipment. Shaft and bearing manufacturers use high-performance materials and strict manufacturing processes to improve performance. For structural design, effective vibration control is an important part of improving transmission system performance and service life.

[0007] The prior art aircraft transmission long shaft bearing vibration reduction mechanism is as follows Figure 4-6 As shown, it includes: the bearing inner ring 102 is installed on the aluminum alloy long shaft 101 through interference fit, the vibration-damping rubber 106 is glued together with the frame seat inner ring 105 and the frame seat outer ring 107 to form a bearing seat, the needle roller bearing 103 is placed in the bearing seat through the bearing inner ring 102 on the aluminum alloy long shaft 101, and the elastic retaining ring 104 is placed in the corresponding groove of the frame seat inner ring 105 using a caliper. The radial clearance of the needle roller bearing 103 is ensured by machining the bearing inner ring 102 and the frame seat inner ring 105, and the axial clearance is ensured by the flange surface of the frame seat inner ring 105 and the elastic retaining ring 104. The four external mounting holes of the frame seat outer ring 107 are connected to the wing rib box. The clearance of the needle roller bearing 103 and the elastic deformation capacity of the rubber 106 directly affect the stability of the transmission.

[0008] Since the prototype vibrates during the test, the rubber 106 becomes debonded from the frame seat inner ring 105 and the frame seat outer ring 107, and it is urgent to improve the structure. Utility Model Content

[0009] In view of the deficiencies in the prior art, the utility model provides a vibration reduction mechanism for a long-axis bearing of an aircraft transmission, which solves the problem in the prior art that debonding due to vibration affects the vibration reduction performance.

[0010] The purpose of the utility model is achieved as follows: an aircraft transmission long shaft bearing vibration reduction mechanism, comprising a long shaft, on which a bearing inner ring, a needle bearing, and a frame seat are sequentially sleeved from the inside to the outside, a rubber mounting hole is opened on the ear plate on the outer periphery of the frame seat, and a vibration reduction rubber is arranged in the rubber mounting hole.

[0011] Furthermore, the front and back sides of the ear plate are provided with rubber mounting holes, and vibration-damping rubber is provided in the rubber mounting holes.

[0012] Furthermore, the vibration-damping rubber is interference-fitted with the rubber mounting hole.

[0013] Furthermore, the inner ring of the bearing is interference fit with the long shaft.

[0014] Furthermore, an inner flange is provided at one end of the inner ring of the frame seat, a groove is provided at the other end of the inner ring of the frame seat, an elastic retaining ring is provided in the groove, and the elastic retaining ring cooperates with the inner flange to limit the axial displacement of the needle roller bearing.

[0015] Compared with the prior art, the beneficial effect of the utility model is that the utility model eliminates the influence of debonding caused by vibration when the shock-absorbing rubber is used to connect the split frame seat in the prior art by directly installing the shock-absorbing rubber in the complete frame seat, thereby extending its service life, improving the reliability of the long shaft bearing, and greatly improving the transmission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the structure of the utility model.

[0018] Figure 2 It is a partial enlarged view of the utility model.

[0019] Figure 3 It is a partial cross-sectional view of the utility model.

[0020] Figure 4 It is a structural schematic diagram of the existing technical solution.

[0021] Figure 5This is a partial enlarged view of the prior art solution.

[0022] Figure 6 It is a partial cross-sectional view of the prior art solution. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example

[0024] like Figure 1-3 The aircraft transmission long shaft bearing vibration reduction mechanism shown in the figure has a bearing inner ring 202 mounted on the long shaft 201 by interference fit, and a vibration reduction rubber 206 mounted in a mounting hole of a frame seat 205 by interference fit, so as to be connected to the wing rib box. The elastic deformation of the vibration reduction rubber 206 reduces the influence of vibration on the bearing and the shaft, thereby ensuring the stability of the transmission. The needle roller bearing 203 is placed in the frame seat 205 through the bearing inner ring 202 on the long shaft 201, and a caliper is used to place the elastic retaining ring 104 into the corresponding groove of the frame seat 205. The radial clearance of the needle roller bearing 203 is ensured by machining the bearing inner ring 202 and the frame seat 205, and the axial clearance is ensured by the inner flange edge of the frame seat 205 and the elastic retaining ring 204.

[0025] Specifically, the long shaft 201 and the frame seat 205 are made of aluminum alloy, and the aluminum alloy long shaft 201 needs to meet the dynamic balance requirements. The inner ring of the bearing 202 is made of carburized bearing steel and high-frequency quenched. The vibration damping rubber 206 is made of rubber vulcanization, and its compression performance needs to be tested after it is made. The needle bearing 103 and the elastic retaining ring 104 are standard parts and can be purchased and used directly.

[0026] After assembly, you can rotate the shaft by hand to observe whether there is obvious movement and listen to whether there is any abnormal sound when the bearing rotates.

[0027] In summary, the utility model eliminates the impact of debonding caused by vibration when the shock-absorbing rubber 206 is used to connect the split frame seat 205 in the prior art by directly installing the shock-absorbing rubber 206 in the complete frame seat 205. The utility model has a simple structure and the standard parts contained therein can be purchased and used directly, which simplifies the manufacturing and assembly process, reduces vibration and greatly improves the transmission efficiency.

[0028] The above embodiments are only used to help understand the method and core idea of ​​the utility model. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made to the utility model without departing from the principle of the utility model, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. An aircraft transmission long shaft bearing vibration reduction mechanism, comprising a long shaft, on which a bearing inner ring, a needle bearing, and a frame seat are sequentially sleeved from the inside to the outside, characterized in that: A rubber mounting hole is provided on the ear plate on the outer periphery of the frame seat, and a vibration-damping rubber is provided in the rubber mounting hole; The front and back sides of the ear plates are provided with rubber mounting holes, and vibration-damping rubber is provided in the rubber mounting holes; The vibration-damping rubber is interference-fitted with the rubber mounting hole; An inner flange is provided at one end of the inner ring of the frame seat, a groove is provided at the other end of the inner ring of the frame seat, an elastic retaining ring is provided in the groove, and the elastic retaining ring cooperates with the inner flange to limit the axial displacement of the needle roller bearing.

2. The aircraft transmission long shaft bearing vibration reduction mechanism according to claim 1, characterized in that: The inner ring of the bearing is interference fit with the long shaft.

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