A kind of installation tool for the tension bearing of the rotor shaft of the main reducer

Abstract

The utility model discloses a mounting fixture for a tension bearing of a rotor shaft of a main reducer, wherein a lug is arranged on one end face of the tension bearing, and the mounting fixture comprises: a pull rod, a pressure plate I, a hydraulic push assembly, a pressure plate II, and also comprises: a support plate I detachably fixed to a casing; an arc surface I is arranged on the upper surface of the support plate I; the arc surface I is flush with the lower end face of the casing mounting position, and a shallow boss for limiting the end face position of the tension bearing is arranged at one end away from the mounting position; the shallow boss is provided with a groove matched with the lug. The utility model provides a mounting fixture for a tension bearing of a rotor shaft of a main reducer, wherein the tension bearing is placed in front of the mounting position through the support plate I, and a groove is arranged on the shallow boss for placing the lug of the outer ring of the tension bearing, which plays a positioning role in the installation direction of the tension bearing, and avoids the problem that the outer ring of the tension bearing is not positioned accurately during manual installation, resulting in the inability to install the tension bearing clamping ring in the subsequent installation.

Description

Technical Field

[0001] The utility model relates to the technical field of helicopter manufacturing and maintenance, and more specifically, to an installation tool for a main reducer rotor shaft tension bearing. Background Art

[0002] The tension bearing of the rotor shaft of a certain type of helicopter main reducer is a key rotating component of the entire main reducer. It is installed in and carries all the lift of the entire aircraft in flight. Because of its large load and harsh working conditions, its life is not long, and it needs to be replaced every time the main reducer is overhauled. The correct installation of the tension bearing is the key to whether the tension bearing can be used reliably. In order to improve the reliability and service life of the tension bearing, this type of main reducer was upgraded in the later period. The improved and upgraded tension bearing is an inseparable structure, and the pressing end face of the outer ring of the tension bearing is provided with a lug. It is necessary to make the inner ring and outer ring of the tension bearing fit with the rotor shaft and the casing by interference. During installation, the outer ring of the tension bearing has a position requirement relative to the circumference of the casing installation position, so the installation procedure is more complicated, requiring more human resources and tooling equipment resources, and the coordination requirements between personnel are also higher, and the success rate of the one-time installation of the tension bearing is low.

[0003] The utility model patent with patent application number CN218698355U discloses a radial positioning ring installation tool for the bearing chamber. The long pull rod passes through the upper cap of the tensioner nut, the circular sleeve plate, the hydraulic nut tensioner, the gasket, the radial positioning ring of the bearing chamber, the bearing chamber, and the tension bearing chamber support from top to bottom. The upper end locks the tensioner nut so as to cooperate with the hydraulic nut tensioner to limit the tensioner nut; the hydraulic nut tensioner moves downward to apply downward pressure to the radial positioning ring of the tension bearing chamber, so that the radial positioning ring of the bearing chamber moves downward, and the lower end of the radial positioning ring of the bearing chamber is assembled and fixed to the upper assembly groove of the tension bearing chamber. The radial positioning ring of the bearing chamber of the gas turbine is assembled with the bearing chamber conveniently, safely and accurately.

[0004] However, this device cannot ensure that the component to be installed is installed at the specified circumferential position of the installation position during installation, and is not suitable for the installation of tension bearings that have circumferential position requirements for the installation position. Utility Model Content

[0005] An object of the present invention is to solve the above-mentioned problems and / or disadvantages and to provide advantages which will be described below.

[0006] In order to achieve these purposes and other advantages of the utility model, a mounting fixture for a main reducer rotor shaft tension bearing is provided, wherein a lug is provided on one end surface of the tension bearing, and the mounting fixture comprises: a tie rod with threads at both ends, a pressure plate I fixed to one end of the tie rod by a nut I, a hydraulic push assembly passing through the tie rod and close to one side of the pressure plate I, a pressure plate II fixed to the other end of the tie rod by a nut II, and further comprising: a support plate I detachably fixed to the mounting surface of the bottom cover of the casing;

[0007] The upper surface of the support plate I is provided with an arc surface I which matches with the outer ring of the tension bearing;

[0008] The arc surface I is flush with the lower end surface of the casing installation position, and a shallow boss is provided at the end away from the installation position to limit the end surface position of the tension bearing;

[0009] The upper surface of the shallow boss is matched with the hydraulic pushing component, and the shallow boss is provided with a groove matched with the lug.

[0010] Preferably, the hydraulic pushing assembly includes: a hydraulic actuator arranged close to pressure plate I, a bearing press for applying pressure to the inner and outer rings of the tension bearing, a pressure plate III arranged between the hydraulic actuator and the bearing press, and a guide block arranged on the inner side of the bearing press.

[0011] Preferably, one end of the guide block is provided with a step groove matching the inner hole of the bearing press;

[0012] A truncated cone-shaped guide head is provided at the other end of the guide block;

[0013] The end surface of the bearing press in contact with the tension bearing is provided with an avoidance groove for avoiding the lug;

[0014] The side surface of the bearing press is provided with a plurality of weight-reducing waist-shaped holes.

[0015] Preferably, it further comprises a support plate II detachably fixed to the casing hanging mounting surface;

[0016] The diameter of the pressure plate III is larger than the diameter of the hydraulic actuator, and the diameter of the pressure plate III is equal to the diameter of the bearing press at the contact end thereof;

[0017] The upper surface of the support plate II is provided with a curved surface II that matches the outer side of the pressure plate III;

[0018] A stop boss for limiting the position of the pressure plate III is provided on one side of the arc surface II close to the end surface of the pressure plate III.

[0019] Preferably, plastic caps are provided at both ends of the pull rod;

[0020] A plastic rubber sleeve is provided on the non-threaded portion of the pull rod surface.

[0021] Preferably, the end surface of the pressure plate II in contact with the rotor shaft is provided with a centering boss matching the inner diameter thereof;

[0022] The pressing plate II is provided with a plurality of weight-reducing circular holes.

[0023] The utility model includes at least the following beneficial effects: the tension bearing is placed in front of the installation position through the support plate I, ensuring that the tension bearing is coaxial with the installation position when installed; a groove is provided on the shallow boss for placing the lug of the outer ring of the tension bearing, which plays a positioning role in the installation direction of the tension bearing, avoiding the problem that the outer ring of the tension bearing is not accurately positioned during manual installation, resulting in the inability to install the subsequent tension bearing clamping ring, and the like.

[0024] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of an installation tool for a main reducer rotor shaft tension bearing in one embodiment of the utility model;

[0026] Figure 2 It is a structural schematic diagram of a mounting fixture support plate I of a main reducer rotor shaft tension bearing in one embodiment of the utility model;

[0027] Figure 3 This is a schematic diagram of the casing structure in one embodiment of the utility model;

[0028] Figure 4 It is a cross-sectional view of an installation tool for a main reducer rotor shaft tension bearing in one embodiment of the utility model;

[0029] Figure 5 It is a cross-sectional view of a mounting fixture pressure plate I of a main reducer rotor shaft tension bearing in one embodiment of the utility model.

[0030] Markings in the figure: 1, tension bearing, 11, lug, 2, tie rod, 21, thread, 22, plastic cap, 23, plastic rubber sleeve, 3, pressure plate I, 31, nut I, 32, gasket I, 4, hydraulic push assembly, 41, hydraulic actuator, 42, pressure plate III, 43, bearing press, 431, avoidance groove, 432, weight-reducing waist-shaped hole, 44, guide block, 441, step groove, 442, guide head, 5, pressure plate II, 51, nut II, 52, gasket II, 53, centering boss, 54, weight reduction Round hole, 6, support plate Ⅰ, 61, arc surface Ⅰ, 62, shallow boss, 621, groove, 63, mounting part Ⅰ, 631, through hole Ⅰ, 632, nut III, 633, gasket III, 7, support plate Ⅱ, 71, arc surface Ⅱ, 72, stop boss, 73, mounting part Ⅱ, 731, through hole Ⅱ, 732, nut IV, 733, gasket IV, 734, round hole, 8, casing, 81, casing bottom cover mounting surface, 811, stud Ⅰ, 82, casing suspension mounting surface, 821, stud Ⅱ, 9, rotor shaft. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0032] It should be understood that terms such as “having”, “including” and “comprising” used herein do not recite the existence or addition of one or more other elements or combinations thereof.

[0033] It should be noted that in the description of the present invention, the orientation or position relationship indicated by the term is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present utility model, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "sleeved / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0035] In addition, in the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] Example 1

[0037] A mounting tool for the main reducer rotor shaft tension bearing, the structure of which is as follows Figure 1-2 As shown, a lug 11 is provided on one end face of the tension bearing 1, and the installation tool comprises: a pull rod 2 with threads at both ends, a pressure plate Ⅰ3 fixed to one end of the pull rod 2 by a nut Ⅰ31, a hydraulic push assembly 4 penetrating the pull rod 2 and close to one side of the pressure plate Ⅰ3, a pressure plate Ⅱ5 fixed to the other end of the pull rod 2 by a nut Ⅱ51, and also comprises: a support plate Ⅰ6 detachably fixed to the mounting surface 81 of the bottom cover of the casing;

[0038] The upper surface of the support plate Ⅰ6 is provided with an arc surface Ⅰ61 matching with the outer ring of the tension bearing 1;

[0039] The arc surface I 61 is flush with the lower end surface of the casing installation position, and a shallow boss 62 is provided at the end away from the installation position to limit the end surface position of the tension bearing 1;

[0040] The upper surface of the shallow boss 62 cooperates with the hydraulic pushing assembly 4 , and the shallow boss 62 is provided with a groove 621 that cooperates with the lug 11 .

[0041] In actual application, a mounting portion Ⅰ63 which can be fixed to the receiver 8 is provided at one end of the support plate Ⅰ6 close to the mounting position, and the mounting portion Ⅰ63 is provided with three through holes Ⅰ631 which cooperate with the studs Ⅰ811 of the mounting surface 81 of the receiver bottom cover. During installation, the three through holes Ⅰ631 respectively pass through the studs Ⅰ811 and the support plate Ⅰ6 is fixed to the receiver 8 by nuts Ⅲ632 and gaskets Ⅲ633; a nut Ⅰ31 and a gasket Ⅰ32 are provided at one end of the pressure plate Ⅰ3 close to the end face of the pull rod 2 to fix the position of the pressure plate Ⅰ3; nuts Ⅱ51 and gaskets Ⅱ52 are provided at both ends of the pressure plate Ⅱ5 to fix the position of the pressure plate Ⅱ5.

[0042] Working principle: When installing the tension bearing 1, first fix the support plate I6 on the mounting surface 81 of the bottom cover of the casing, then place the tension bearing 1 on the arc surface I61, and place the lug 11 of the tension bearing 1 in the groove 621; then pass one end of the pull rod 2 through the tension bearing 1 and the rotor shaft 9, pass the pressure plate II5 through the pull rod 2, and fix the pressure plate II5 at one end of the pull rod 2 through the nut II51, so that the pressure plate II5 is in close contact with the end surface of the rotor shaft 9, and pass the hydraulic push assembly and the pressure plate I from the other end of the pull rod, fix the pressure plate I3 at the other end of the pull rod 2 through the nut I, place one end of the hydraulic push assembly 4 on the upper surface of the shallow boss 62, and make the tension bearing 1, the hydraulic push assembly 4 and the pressure plate I3 in close contact in turn; finally, press the tension bearing 1 with hydraulic force through the hydraulic push assembly 4 to complete the installation of the tension bearing 1.

[0043] The tension bearing 1 is placed in front of the installation position through the support plate I6 to ensure that the tension bearing 1 is coaxial with the installation position when installed. The shallow boss 62 is provided with a groove 621 for accommodating the lug 11 of the outer ring of the tension bearing 1, which plays a positioning role in the installation direction of the tension bearing 1 and avoids inaccurate positioning of the outer ring of the tension bearing 1 during manual installation, resulting in the inability to install the clamping ring of the subsequent tension bearing 1.

[0044] Example 2

[0045] This embodiment 2 is a preferred embodiment of the present invention, and its specific structure is as follows Figure 1-2 As shown, it discloses the following improvements based on the embodiment 1: the hydraulic pushing assembly 4 includes: a hydraulic cylinder 41 arranged close to the pressure plate I3, a bearing press 43 for applying pressure to the inner and outer rings of the tension bearing 1, a pressure plate III 42 arranged between the hydraulic cylinder 41 and the bearing press 43, and a guide block 44 arranged on the inner side of the bearing press 43;

[0046] One end of the guide block 44 is provided with a step groove 441 that matches the inner hole of the bearing press 43;

[0047] The other end of the guide block 44 is provided with a truncated cone-shaped guide head 442;

[0048] The end surface of the bearing press 43 in contact with the tension bearing 1 is provided with an avoidance groove 431 for avoiding the lug 11;

[0049] The side of the bearing press 43 is provided with a plurality of waist-shaped holes 432 for reducing weight;

[0050] It also includes a support plate II 7 that is detachably fixed to the receiver hanging mounting surface 82;

[0051] The diameter of the pressure plate III 42 is larger than the diameter of the hydraulic actuator 41 cylinder, and the diameter of the pressure plate III 42 is equal to the diameter of the bearing press 43 at the contact end thereof;

[0052] The upper surface of the support plate II7 is provided with a curved surface II71 that matches the outer side of the pressure plate III42;

[0053] A stop boss 72 for limiting the position of the pressure plate III42 is provided on one side of the arc surface II 71 close to the end surface of the pressure plate III 42 .

[0054] In actual application, a mounting portion II73 which can be fixed to the receiver 8 is provided at one end of the support plate II7 near the mounting position, and the mounting portion II73 is provided with two through holes II731 which cooperate with the studs II821 of the receiver hanging mounting surface 82. During installation, the two through holes II731 pass through the studs II821 respectively, and the support plate II7 is fixed to the receiver 8 through nuts IV732 and gaskets IV733; the mounting portion II73 is provided with a circular hole 734 which corresponds to the position of the through hole I631 in the middle of the mounting portion I63, so that the nut III632 corresponding to the support plate I6 can be loaded and unloaded by using tools through the circular hole 734 without disassembling the support plate II7. At the same time, the provision of the circular hole 734 can reduce the weight of the support plate II7. The end face of the bearing press 43 is adapted to the end face of the tension bearing 1, and pressure is applied to the inner and outer rings of the tension bearing 1 at the same time. The pressing end face of the outer ring is provided with two avoidance grooves 431, which are used to avoid the two lugs 11 on the outer ring of the tension bearing 1, so as to prevent the lugs 11 from being damaged by axial pressure during the press-fitting process. The bearing press 43 is also provided with 8 weight-reducing waist-shaped holes 432 on the circumference to reduce the weight. The guide block 44 at the center is made of aluminum, so that the tension bearing 1 can be correctly press-fitted along the axis of the rotor shaft during the press-fitting process, so that the inner and outer rings of the tension bearing 1 are evenly stressed at the same time, so as to prevent the tension bearing 1 from being skewed during the press-fitting process and damaging the rotor shaft 9 and the tension bearing 1, and at the same time reduce the weight of the entire tooling.

[0055] Working principle: When installing the tension bearing 1, first fix the support plate I6 and the support plate II7 to the mounting surface 81 of the bottom cover of the casing and the mounting surface 82 of the casing respectively; then place the tension bearing 1 on the upper surface of the support plate I6, and place the lug 11 of the tension bearing 1 in the groove 621. Then, one end of the guide head 442 of the guide block 44 is directed toward the rotor shaft 9 and partially placed in the rotor shaft 9; place the bearing press 43 on the upper surface of the support plate I6 and the support plate II7, and make the avoidance groove 431 of the bearing press 43 correspond to the lug 11, and the inner surface of the bearing press 43 is aligned and placed closely with the guide block 44 through the step groove 441; place the two ends of the pressure plate III42 close to the bearing press 43 and the stop boss 72 on the arc surface II71. Secondly, pass one end of the tie rod 2 through the pressure plate III 42, the bearing press 43, the guide block 44, the tension bearing 1 and the rotor shaft 9 in sequence, insert the pressure plate II 5 into the tie rod 2, and fix the pressure plate II 5 to one end of the tie rod 2 by means of the nut II 51 and the gasket II 52, so that the pressure plate II 5 is in close contact with the end face of the rotor shaft 9, and insert the hydraulic actuator 41 and the pressure plate I 3 into the tie rod 2 from the other end of the tie rod 2, fix the pressure plate I 3 to the other end of the tie rod 2 by means of the nut I 31 and the gasket I 32, and make the tension bearing 1, the hydraulic pushing assembly 4 and the pressure plate I 3 in close contact in sequence; finally, push the pressure plate III 42 by means of the hydraulic actuator 441, and the pressure plate III 42 pushes the bearing press 43, apply thrust to the inner and outer rings of the tension bearing 1 at the same time to make it evenly stressed, press the tension bearing 1 by means of hydraulic force, and complete the installation of the tension bearing 1.

[0056] Example 3

[0057] This embodiment 3 is a preferred embodiment of the present utility model, which discloses the following improvements based on the embodiment 1: plastic caps 22 are provided at both ends of the pull rod 2;

[0058] A plastic sleeve 23 is provided on the non-threaded portion of the pull rod 2 .

[0059] Working principle: The plastic cap 22 is detachable at both ends of the tie rod 2 and needs to be removed when assembling the pressure plate II 5 and other parts on the tie rod 2. The plastic cap 22 needs to be installed for protection only when the tie rod 2 passes through the inside of the rotor shaft 9.

[0060] The plastic cap 22 and the plastic rubber sleeve 23 can be provided to avoid damage to parts during the tooling installation process, so as to prevent the pull rod 2 from rubbing against the inside of the rotor shaft 9 when passing through the center hole of the rotor shaft 9.

[0061] Example 4

[0062] This embodiment 4 is a preferred embodiment of the present utility model, and its specific structure is as follows Figure 3 As shown, it discloses the following improvements based on the embodiment 1: the end surface of the pressure plate II 5 in contact with the rotor shaft 9 is provided with a centering boss 53 matching the inner diameter thereof;

[0063] The pressure plate II5 is provided with a plurality of weight-reducing circular holes 54 .

[0064] Working principle: the setting of the centering boss 53 can further ensure that the axis of the pull rod 2 and the rotor shaft 9 coincide with each other, avoiding eccentricity of the pull rod 2 after installation, resulting in uneven force on the tension bearing 1 during installation; the setting of the weight-reducing circular hole 54 can reduce the weight of the parts.

[0065] The above solutions are only an illustration of a preferred example, but are not limited thereto. When implementing the present utility model, appropriate replacement and / or modification can be performed according to user needs.

[0066] The number of devices and processing scales described here are used to simplify the description of the utility model. Applications, modifications and variations of the utility model are obvious to those skilled in the art.

[0067] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily realized. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described here.

Claims

1. A mounting tool for a main reducer rotor shaft tension bearing, wherein a lug is provided on one end surface of the tension bearing, and the mounting tool comprises: A tie rod with threads at both ends is fixed to a pressure plate I at one end of the tie rod by a nut I, a hydraulic push assembly is passed through the tie rod and close to one side of the pressure plate I, and is fixed to a pressure plate II at the other end of the tie rod by a nut II, and is characterized in that it also includes: a support plate I that is detachably fixed to the mounting surface of the bottom cover of the casing; The upper surface of the support plate I is provided with an arc surface I which matches with the outer ring of the tension bearing; The arc surface I is flush with the lower end surface of the casing installation position, and a shallow boss is provided at the end away from the installation position to limit the end surface position of the tension bearing; The upper surface of the shallow boss is matched with the hydraulic pushing component, and the shallow boss is provided with a groove matched with the lug.

2. The installation tool for the main reducer rotor shaft tension bearing according to claim 1, characterized in that: The hydraulic pushing assembly includes: a hydraulic actuator arranged close to the pressure plate I, a bearing press for applying pressure to the inner and outer rings of the tension bearing, a pressure plate III arranged between the hydraulic actuator and the bearing press, and a guide block arranged on the inner side of the bearing press.

3. The installation tool for the main reducer rotor shaft tension bearing according to claim 2, characterized in that: One end of the guide block is provided with a step groove matching the inner hole of the bearing press; A truncated cone-shaped guide head is provided at the other end of the guide block; The end surface of the bearing press in contact with the tension bearing is provided with an avoidance groove for avoiding the lug; The side surface of the bearing press is provided with a plurality of weight-reducing waist-shaped holes.

4. The installation tool for the main reducer rotor shaft tension bearing according to claim 2, characterized in that: Also included is a support plate II that is detachably fixed to the receiver's hanging mounting surface; The diameter of the pressure plate III is larger than the diameter of the hydraulic actuator, and the diameter of the pressure plate III is equal to the diameter of the bearing press at the contact end thereof; The upper surface of the support plate II is provided with a curved surface II that matches the outer side of the pressure plate III; A stop boss for limiting the position of the pressure plate III is provided on one side of the arc surface II close to the end surface of the pressure plate III.

5. The installation tool for the main reducer rotor shaft tension bearing according to claim 1, characterized in that: Plastic caps are provided at both ends of the pull rod; A plastic rubber sleeve is provided on the non-threaded portion of the pull rod surface.

6. The installation tool for the main reducer rotor shaft tension bearing according to claim 1, characterized in that: The end surface of the pressure plate II in contact with the rotor shaft is provided with a centering boss matching its inner diameter; The pressing plate II is provided with a plurality of weight-reducing circular holes.

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