CN117401154A - Blade pull rod assembly for solving abnormality of blade pull rod of automatic inclinator - Google Patents
Blade pull rod assembly for solving abnormality of blade pull rod of automatic inclinator Download PDFInfo
- Publication number
- CN117401154A CN117401154A CN202311458683.0A CN202311458683A CN117401154A CN 117401154 A CN117401154 A CN 117401154A CN 202311458683 A CN202311458683 A CN 202311458683A CN 117401154 A CN117401154 A CN 117401154A
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- China
- Prior art keywords
- pull rod
- double
- row ball
- blade pull
- ball bearing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005856 abnormality Effects 0.000 title claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052802 copper Inorganic materials 0.000 claims abstract description 21
- 239000010949 copper Substances 0.000 claims abstract description 21
- 238000007747 plating Methods 0.000 claims abstract description 21
- 230000002159 abnormal effect Effects 0.000 abstract description 13
- 239000002699 waste material Substances 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 241000220317 Rosa Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/54—Mechanisms for controlling blade adjustment or movement relative to rotor head, e.g. lag-lead movement
- B64C27/58—Transmitting means, e.g. interrelated with initiating means or means acting on blades
- B64C27/59—Transmitting means, e.g. interrelated with initiating means or means acting on blades mechanical
- B64C27/605—Transmitting means, e.g. interrelated with initiating means or means acting on blades mechanical including swash plate, spider or cam mechanisms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C11/00—Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft
- B64C11/30—Blade pitch-changing mechanisms
- B64C11/32—Blade pitch-changing mechanisms mechanical
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/04—Helicopters
Abstract
The invention discloses a blade pull rod assembly for solving the problem of abnormal blade pull rods of an automatic inclinator, which comprises a blade pull rod body, an upper fork joint and a lower fork joint, wherein the upper fork joint and the lower fork joint are matched with the two ends of the blade pull rod body, and a double-row ball bearing with an axial clearance value of 0.015-0.030 is arranged between the lower fork joint and the blade pull rod body; the outer ring of the double-row ball bearing is provided with a copper plating layer with single-side thickness of 0.010-0.015 mm, so that the fit clearance between the inner wall of the lower fork joint and the outer ring of the double-row ball bearing is controlled to be-0.030-0.020 mm. The invention provides a blade pull rod assembly for solving the problem of abnormal blade pull rods of an automatic inclinator, which is characterized in that a copper plating layer with a preset single-side thickness is arranged on an outer ring of a double-row ball bearing, so that the problem of the upper limit of axial play of the bearing is solved by reducing the fit clearance between the double-row ball bearing and an inner hole of a lower fork joint, and the economic waste caused by the selection of the double-row ball bearing with the lower limit of the axial play is effectively avoided.
Description
Technical Field
The invention relates to the field of helicopter maintenance. More particularly, the present invention relates to a blade lever assembly for addressing automatic recliner blade lever anomalies.
Background
An automatic inclinator is a main component in a foreign helicopter, and has the function of changing the magnitude and direction of aerodynamic force (rotor tension) of a main rotor, belonging to an operating system. In general, a blade lever connects an automatic recliner rotating disc with a rotor hub axial joint pitch horn, and when the pitch lever is pushed and pulled, cyclic pitch and total pitch of a helicopter are controlled through transmission of the lever, the horn and a longitudinal hydraulic booster. The blade pull rod assembly mainly comprises an upper fork joint, a blade pull rod body, a double-row ball bearing, a lower fork joint and a nut, and the length of the blade pull rod assembly can be changed by rotating the blade pull rod body.
In practical application, the abnormal clearance fault of the blade pull rod belongs to a frequent fault brought by design, the abnormal clearance can cause the working position of the blade pull rod assembly to vibrate greatly in the flight process of the helicopter, the damage of parts is accelerated, the service life of the parts is shortened, and the normal operation of the helicopter can be influenced. However, there is no specific method for eliminating the problem in the manual for overhauling the automatic inclinator, the method commonly used at present is realized by replacing the double-row ball bearings, but how to eliminate abnormal gaps during replacement cannot be realized, so as shown in the following table, the axial play is measured by randomly extracting 10 double-row ball bearings taken out from a blade pull rod assembly with abnormal gaps, and the play is compared with the play of 10 bearings without faults.
As can be seen from the table, the axial clearance of the double-row ball bearing used in the blade pull rod assembly with abnormal clearance is above 0.20mm and is close to the upper limit of the regulated standard (0.015-0.030) mm, so that the aim of eliminating the abnormal clearance can be effectively achieved by adopting the double-row ball bearing with the optional axial clearance between 0.015-0.020 mm (namely, the optional axial clearance is lower than the lower limit), but the repairing method can lead the bearing with the upper limit of the clearance not to be used, and for a batch of purchased double-row ball bearings, the axial clearance value is more than 0.020mm and accounts for 60 percent of the total amount, and the range of the axial clearance of the double-row ball bearing is less than 0.020mm and only accounts for 40 percent, and manufacturers cannot singly order the double-row ball bearing with the axial clearance between 0.015-0.020 mm. Therefore, a large number of double-row ball bearings in the same batch cannot be used, and waste is serious.
Disclosure of Invention
It is an object of the present invention to address the above problems and/or disadvantages and to provide advantages which will be described below.
To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, there is provided a blade lever assembly for solving the problem of an automatic recliner blade lever abnormality, comprising a blade lever body, and upper and lower fork joints fitted to both ends thereof, a double row ball bearing having an axial play value of 0.015 to 0.030 being provided between the lower fork joint and the blade lever body;
the outer ring of the double-row ball bearing is provided with a copper plating layer with single-side thickness of 0.010-0.015 mm, so that the fit clearance between the inner wall of the lower fork joint and the outer ring of the double-row ball bearing is controlled to be-0.030-0.020 mm.
The invention at least comprises the following beneficial effects: the technical scheme is used for solving the waste problem caused by the fact that when the automatic inclinator blade pull rod has abnormal clearance, the bearing is selected to process the problem of the abnormal clearance of the blade pull rod; the copper plating layer with the preset single-side thickness is arranged on the outer ring of the double-row ball bearing, so that the problem of the upper limit of the axial clearance of the bearing is solved by reducing the fit clearance between the double-row ball bearing and the inner hole of the lower fork joint, and the economic waste caused by the selection of the double-row ball bearing with the lower limit of the axial clearance is effectively avoided.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic diagram of a double row ball bearing in accordance with one embodiment of the present invention;
FIG. 2 is a schematic structural view of a blade lever assembly for addressing an anomaly of an automatic recliner blade lever in one embodiment of the present invention.
Detailed Description
The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.
It will be understood that terms, such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
It should be noted that, in the description of the present invention, the orientation or positional relationship indicated by the term is based on the orientation or positional relationship shown in the drawings, which are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. .
In the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "configured to," "engaged with," "connected to," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, may be a detachable connection, or may be integrally connected, may be mechanically connected, may be electrically connected, may be directly connected, may be indirectly connected through an intermediate medium, may be communication between two members, and may be understood in a specific manner by those skilled in the art.
Furthermore, in the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be a direct contact of the first and second features, or an indirect contact of the first and second features through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
Example 1
The structure of the blade pull rod assembly for solving the problem of abnormality of the blade pull rod of the automatic inclinator is shown in fig. 1-2, and the blade pull rod assembly comprises a blade pull rod body 1, an upper fork joint 2 and a lower fork joint 3 which are matched with the two ends of the blade pull rod body, wherein a double-row ball bearing 4 with an axial clearance value of 0.015-0.030 is arranged between the lower fork joint and the blade pull rod body;
wherein, the outer ring 40 of the double-row ball bearing is provided with a copper plating layer 41 with single-side thickness of 0.010 mm-0.015 mm, so that the fit clearance between the inner wall of the lower fork joint and the outer ring of the double-row ball bearing is controlled between-0.030 mm and-0.020 mm
Working principle: in practical application, the existing scheme needs to select and install the axial clearance range of 0.015 mm-0.020 mm of the double-row ball bearing; the inner hole size of the lower fork joint isThe outer circle sizes of the double-row ball bearings are respectivelyThe matching size is-0.008 mm to +0.029mm. However, the scheme can lead the double-row ball bearing with the axial clearance value range of more than 0.020mm not to be used, the part of the double-row ball bearings purchased in the same batch can not be used, and the double-row ball bearing accounts for about 60 percent of the total amount, and the scheme adopts a structure of adding a copper plating layer on the cylindrical surface of the outer ring of the double-row ball bearing, so that the axial clearance of the double-row ball bearing can be optionally arranged within the range of 0.015-0.030 mm during maintenance; the bearing outer ring is plated with a copper plating layer with single-side thickness of 0.010 mm-0.015 mm, namely, the contact stress between the steel ball of the double-row ball bearing and the inner ring and the outer ring is changed by changing the matching of the outer ring of the double-row ball bearing and the lower fork joint, so that the aim of indirectly changing the axial clearance of the steel ball of the double-row ball bearing is fulfilled. When the double-row ball bearing is applied, the axial clearance of the double-row ball bearing can be optionally arranged within the range of 0.015 mm-0.020 mm, and the inner hole size of the lower fork joint is as followsThe outer circle sizes of the double-row ball bearings are respectively +.>The matching size is-0.030 mm to-0.020 mm.
Examples:
1. theoretical analysis
The axial clearance value range of the purchased double-row ball bearings in the measuring factory is more than 0.020mm and accounts for 60 percent of the total amount, and the axial clearance value of the purchased double-row ball bearings is less than 0.020mm and accounts for 40 percent only, so that the assembly of the purchased double-row ball bearings can not meet the actual requirement by simply selecting the axial clearance between 0.015mm and 0.020mm, and the repair cost is greatly increased. The consultation manufacturer knows that the double-row ball bearing (also called double-row aligning ball bearing) with the axial clearance of 0.015-0.020 mm cannot be ordered independently, and through anatomical analysis on the bearing, the contact stress between the steel ball of the double-row ball bearing and the inner ring and the outer ring can be changed by changing the outer ring of the double-row ball bearing to be matched with the lower fork joint, so that the aim of indirectly changing the axial clearance of the double-row ball bearing is fulfilled.
When the outer ring of the double-row ball bearing and the lower fork joint are in interference fit from clearance fit, the contact stress P between the inner wall of the lower fork joint and the outer ring of the bearing is increased and transmitted to the steel ball and the inner ring, so that the radius R1 of the steel ball has a trend of becoming smaller, the radius R2 of the raceway of the inner ring of the bearing has a trend of increasing, and according to the following contact stress calculation formula, the purposes of increasing the contact stress and reducing the axial play can be achieved by changing the fit of the outer ring of the double-row ball bearing and the lower fork joint.
Symbol meaning and unit: sigma (sigma) max -maximum contact pressure stress (Pa);
p-concentrated load (N);
e-elastic modulus (Pa);
R 1 -sphere radius (m);
R 2 -sphere radius (m).
2. And (3) test verification:
the color of the copper plating layer is light red or rose red, the passivated copper plating layer is bright light red, the copper plating layer is easy to polish, and the copper plating layer has higher binding force with other metals; the copper plating has a medium hardness. The bearing copper plating process is widely applied to repair processes of various parts such as a helicopter engine, a speed reducer and the like in factories, and the process is mature. Therefore, factors such as process difficulty and the like are comprehensively considered, and a copper plating mode is adopted for the cylindrical surface of the outer ring of the double-row ball bearing in the actual test process.
In order to verify the effectiveness of the method, two groups of fault bearings taken out of the blade pull rod assembly with abnormal gaps are selected respectively, copper plating treatment is carried out on the outer ring of the bearings respectively, and the thickness of a copper plating layer is controlled according to 0.01-0.015 mm of a single side.
The inner hole sizes of the lower fork joint are respectivelyThe outer circle sizes of the double-row ball bearings before and after copper plating are respectivelyAnd->The matching size before and after copper plating is-0.008 mm
+0.029mm and-0.038 mm to +0.009mm.
The two groups of outer ring copper plating bearings are respectively arranged on the blade pull rod assemblies of the two helicopters, after ground driving and in-factory test flight, no abnormal gap exists on the blade pull rod assemblies of the two helicopters with the new bearing or the fault bearing, and accordingly, the double-row ball bearing outer ring copper plating can be determined to effectively eliminate the blade pull rod abnormal gap.
The above embodiments are merely illustrative of a preferred embodiment, but are not limited thereto. In practicing the present invention, appropriate substitutions and/or modifications may be made according to the needs of the user.
The number of equipment and the scale of processing described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be readily apparent to those skilled in the art.
Although embodiments of the invention have been disclosed above, they are not limited to the use listed in the specification and embodiments. It can be applied to various fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. Therefore, the invention is not to be limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (1)
1. The blade pull rod assembly for solving the problem of abnormality of the blade pull rod of the automatic inclinator comprises a blade pull rod body, and an upper fork joint and a lower fork joint which are matched with the two ends of the blade pull rod body, and is characterized in that a double-row ball bearing with an axial clearance value of 0.015-0.030 is arranged between the lower fork joint and the blade pull rod body;
the outer ring of the double-row ball bearing is provided with a copper plating layer with single-side thickness of 0.010-0.015 mm, so that the fit clearance between the inner wall of the lower fork joint and the outer ring of the double-row ball bearing is controlled to be-0.030-0.020 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311458683.0A CN117401154A (en) | 2023-11-02 | 2023-11-02 | Blade pull rod assembly for solving abnormality of blade pull rod of automatic inclinator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311458683.0A CN117401154A (en) | 2023-11-02 | 2023-11-02 | Blade pull rod assembly for solving abnormality of blade pull rod of automatic inclinator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117401154A true CN117401154A (en) | 2024-01-16 |
Family
ID=89499739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311458683.0A Pending CN117401154A (en) | 2023-11-02 | 2023-11-02 | Blade pull rod assembly for solving abnormality of blade pull rod of automatic inclinator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117401154A (en) |
-
2023
- 2023-11-02 CN CN202311458683.0A patent/CN117401154A/en active Pending
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