An installation tool for the locking nut of the engine main shaft bearing and its usage method

Abstract

A tool for installing a locking nut of an engine main shaft bearing and a method for using the tool belong to the field of mechanical processing technology. The bearing seat fixing base is plugged into the coaxial reaction seat; the coaxial reaction seat is plugged with a coaxial reaction pile, the coaxial reaction pile is plugged into a torque multiplier, the torque multiplier is connected to a wrench, and a tightening sleeve is provided on the outside of the torque multiplier. The method is as follows: fix the outer ring of the bearing on the bearing seat fixing base, screw the bearing locking nut into the outer ring of the bearing; install the coaxial reaction seat on the bearing seat fixing base; insert the coaxial reaction pile into the coaxial reaction seat; insert the tightening sleeve into the locking nut; insert the torque multiplier into the coaxial reaction pile and the tightening sleeve; put the wrench into the upper end of the torque multiplier; rotate the wrench and transmit it to the locking nut through the tightening sleeve. The present invention can prevent the deformation of the locking nut and the inability to assemble normally caused by the upward warping of the tightening sleeve, and realizes the function of stable locking of the locking nut of the main shaft bearing of the aircraft engine.

Description

Technical Field

[0001] The present invention relates to an installation tool for a locking nut of an engine main shaft bearing and a using method thereof, belonging to the technical field of machining. Background Art

[0002] When installing a bearing on a mechanical part, a locking nut is installed simultaneously to prevent the bearing from falling off.

[0003] Currently, a rotary single-arm tightening wrench is generally used to tighten the locking nut. However, during machining, since the torque is input by a single arm, problems such as the overturning of the tightening force and the upward warping of the tightening sleeve, resulting in the deformation of the locking nut and abnormal assembly, often occur.

[0004] Therefore, an installation tool that can prevent the overturning of the tightening force, has a simple structure, is convenient to operate, and has high machining efficiency is needed. Summary of the Invention

[0005] To solve the problems in the background art, the present invention provides an installation tool for a locking nut of an engine main shaft bearing and a using method thereof.

[0006] To achieve the above object, the present invention adopts the following technical solution: An installation tool for a locking nut of an engine main shaft bearing includes a wrench, a torque multiplier, a tightening sleeve, a coaxial reaction pile, a coaxial reaction seat, and a bearing seat fixing base; the middle part of the bearing seat fixing base is inserted into the coaxial reaction seat; a coaxial reaction pile is inserted into the middle part of the coaxial reaction seat, the upper end of the coaxial reaction pile is inserted into the lower end of the torque multiplier, the upper end of the torque multiplier is connected to the wrench, and the tightening sleeve is sleeved outside the torque multiplier.

[0007] A using method of the installation tool for a locking nut of an engine main shaft bearing of the present invention, the method includes the following steps:

[0008] S1: Fix the bearing seat fixing base on the workbench;

[0009] S2: Fix the fully assembled bearing outer ring on the annular boss of the bearing seat fixing base, and at the same time manually screw the external thread part of the locking nut into the fully assembled bearing outer ring until it can no longer be screwed in;

[0010] S3: Install the coaxial reaction seat on the bottom plate of the bearing seat fixing base;

[0011] S4: Snap the coaxial reaction pile into the coaxial reaction seat;

[0012] S5: Snap a plurality of convex teeth of the tightening sleeve into the keyway inside the locking nut;

[0013] S6: insert the lower end of the torque multiplier into the coaxial reaction pile, and the external spline torque transmission structure of the torque multiplier is meshed and inserted into the internal spline of the tightening sleeve;

[0014] S7: Insert the wrench into the outer square structure at the upper end of the torque multiplier;

[0015] S8: Turn the wrench to input the tightening force into the torque multiplier, and offset the counter-torque of the torque multiplier through the coaxial reaction pile, so that the external spline torque transmission structure of the torque multiplier can rotate to output the amplified torque, and transmit it to the locking nut through the tightening sleeve.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention applies the coaxial reaction force principle, and the whole and parts are coaxially assembled. The coaxial reaction force pile cooperates with the coaxial reaction force seat and the bearing seat base to offset the tightening force overturning moment of the torque multiplier during operation, and can effectively prevent the deformation of the locking nut and the inability to assemble normally caused by the upward warping of the tightening sleeve, thereby realizing the function of stable locking of the locking nut of the main shaft bearing of the aircraft engine. It is easy to operate and has stable processing quality; the same type of bearings only need to replace the tightening sleeve of the appropriate specification to use this device, which has strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 yes Figure 1 AA section view;

[0020] Figure 3 is a schematic diagram of the structure of the torque multiplier;

[0021] Figure 4 yes Figure 3 BB cross-sectional view;

[0022] Figure 5 It is a structural schematic diagram of the tightening sleeve;

[0023] Figure 6 yes Figure 5 CC section view;

[0024] Figure 7 It is a structural schematic diagram of the bearing seat fixing base;

[0025] Figure 8 yes Figure 7 DD cross-sectional view;

[0026] Figure 9 It is a structural schematic diagram of the coaxial reaction seat. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0028] An installation tool for the locking nut of the engine main shaft bearing includes a wrench 1, a torque multiplier 2, a tightening sleeve 3, a coaxial reaction pile 4, a coaxial reaction seat 6, and a bearing seat fixing base; the middle part of the bearing seat fixing base is inserted into the coaxial reaction seat 6; a coaxial reaction pile 4 is inserted into the middle part of the coaxial reaction seat 6. Specifically, a semi-circular arc groove 11 penetrating in the thickness direction is provided in the middle of the coaxial reaction seat 6, and a semi-cylindrical convex block is provided at the lower end of the coaxial reaction pile 4, and the semi-cylindrical convex block is inserted into the semi-circular arc groove 11 in a matching manner to limit the rotation of the coaxial reaction pile 4. The upper end of the coaxial reaction pile 4 is inserted into the lower end of the torque multiplier 2. Specifically, the square structure at the lower end of the torque multiplier 2 is clamped into the square key groove at the upper end of the coaxial reaction pile 4. The upper end of the torque multiplier 2 is connected to the wrench 1. Specifically, the inner square part of the wrench 1 is sleeved into the outer square protrusion of the torque multiplier 2. A tightening sleeve 3 is sleeved outside the torque multiplier 2.

[0029] The input end and the output end of the torque multiplier 2 are of a coaxial structure, the reaction force transmission path is short, the tightening system has good rigidity and strength, and at the same time, the output end is of an involute spline structure, which plays a role in evenly outputting the torque by borrowing at multiple points.

[0030] The input end of the tightening sleeve 3 has an internal involute spline structure, which is convenient for connecting with the torque multiplier, and the output end has a rectangular tooth structure, which is matched with the inner diameter key groove structure of the locking nut, and can effectively distribute the tightening force evenly on the locking nut.

[0031] The coaxial reaction pile 4 is centrally arranged, and its top has a square key groove structure for clamping into the reaction force output end of the torque multiplier.

[0032] The coaxial reaction seat 6 has a semi-circular arc groove 11 structure, which can effectively contact with the coaxial reaction pile and prevent the coaxial reaction pile system from rotating; the material used is GC15 bearing steel, heat-treated to HRC43 - 48.

[0033] The bearing seat fixing base includes a bottom plate 5 and an annular boss 7 formed integrally. The annular boss 7 is coaxially fixed at the upper end of the bottom plate 5, and a plurality of slots 8 are provided along the circumferential direction of the annular boss 7. The middle part of the bottom plate 5 is inserted into the coaxial reaction seat 6 through a trapezoidal hole.

[0034] A jack is provided in the middle of the upper end of the tightening sleeve 3. A plurality of internal splines 10 are evenly distributed along the circumferential direction of the inner wall of the jack. The external spline torque transmission structure of the torque multiplier 2 is meshed and inserted into the internal spline 10 of the tightening sleeve 3. A plurality of convex teeth 9 are provided along the circumferential direction of the lower end surface of the tightening sleeve 3, and the plurality of convex teeth 9 are snapped into the key grooves inside the lock nut.

[0035] A method for using an installation tool for a lock nut of an engine main shaft bearing according to the present invention, the method comprising the following steps:

[0036] S1: Fix the bearing seat fixing base on the workbench;

[0037] S2: Fix the fully assembled bearing outer ring 12 on the annular boss 7 of the bearing seat fixing base, and at the same time manually screw the external thread part of the lock nut into the fully assembled bearing outer ring 12 until it can no longer be screwed in;

[0038] S3: Install the coaxial reaction seat 6 on the bottom plate 5 of the bearing seat fixing base;

[0039] S4: Snap the coaxial reaction pile 4 into the semi-circular arc groove 11 of the coaxial reaction seat 6;

[0040] S5: Snap the plurality of convex teeth 9 of the tightening sleeve 3 into the key grooves inside the lock nut;

[0041] S6: Insert the lower square torque transmission structure of the torque multiplier 2 into the upper square key groove structure of the coaxial reaction pile 4, and the external spline torque transmission structure of the torque multiplier 2 is meshed and inserted into the internal spline 10 of the tightening sleeve 3;

[0042] S7: Slip the wrench 1 onto the outer square structure at the upper end of the torque multiplier;

[0043] S8: Rotate the wrench 1 to input the tightening force into the torque multiplier 2, offset the reaction torque of the torque multiplier 2 through the coaxial reaction pile 4, realize the rotation output of the amplified torque by the external spline torque transmission structure of the torque multiplier 2, and transmit it to the lock nut through the tightening sleeve 3, so as to complete the processing according to the specified torque or tightening pressure locking requirements.

[0044] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent conditions of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0045] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for using an installation tool for an engine main shaft bearing locking nut, the method being completed based on an installation tool for an engine main shaft bearing locking nut, the installation tool for an engine main shaft bearing locking nut comprising a wrench (1), a torque multiplier (2), a tightening sleeve (3), a coaxial reaction pile (4), a coaxial reaction seat (6), and a bearing seat fixing base; the middle of the bearing seat fixing base is inserted into the coaxial reaction seat (6); the middle of the coaxial reaction seat (6) is inserted with a coaxial reaction pile (4), the upper end of the coaxial reaction pile (4) is inserted into the lower end of the torque multiplier (2), the upper end of the torque multiplier (2) is connected to the wrench (1), and a tightening sleeve (3) is sleeved outside the torque multiplier (2), characterized in that: The method includes the following steps: S1: Fix the bearing housing fixing base on the workbench; S2: Fix the fully assembled bearing outer ring (12) on the annular boss (7) of the bearing housing fixing base, and at the same time manually screw the external thread part of the locking nut into the fully assembled bearing outer ring (12) until it can no longer be screwed in; S3: Install the coaxial reaction seat (6) on the bottom plate (5) of the bearing housing fixing base; S4: Snap the coaxial reaction pile (4) into the coaxial reaction seat (6); S5: Snap the multiple convex teeth (9) of the tightening sleeve (3) into the keyway inside the locking nut; S6: Insert the lower end of the torque multiplier (2) into the coaxial reaction pile (4), and the external spline torque transmission structure of the torque multiplier (2) meshes and inserts into the internal spline (10) of the tightening sleeve (3); S7: Put the wrench (1) on the external square structure at the upper end of the torque multiplier; S8: Rotate the wrench (1) to input the tightening force into the torque multiplier (2), offset the reaction torque of the torque multiplier (2) through the coaxial reaction pile (4), realize the rotation output of the amplified torque by the external spline torque transmission structure of the torque multiplier (2), and transmit it to the locking nut through the tightening sleeve (3).

2. The usage method of an installation tool for the locking nut of the engine main shaft bearing according to claim 1, characterized in that: The bearing housing fixing base includes an integrally formed bottom plate (5) and an annular boss (7). The annular boss (7) is coaxially fixed at the upper end of the bottom plate (5), and the annular boss (7) is provided with a plurality of slots (8) along its circumferential direction. The middle part of the bottom plate (5) is in fit and insertion connection with the coaxial reaction seat (6).

3. The usage method of an installation tool for the locking nut of the engine main shaft bearing according to claim 2, characterized in that: The middle part of the upper end of the tightening sleeve (3) is provided with a jack. The inner wall of the jack is circumferentially and uniformly provided with a plurality of internal splines (10). The external spline torque transmission structure of the torque multiplier (2) meshes and inserts into the internal spline (10) of the tightening sleeve (3). The lower end surface of the tightening sleeve (3) is provided with a plurality of convex teeth (9).

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