CN113865515A - Bearing deflection angle measuring method and tool thereof, and bearing installation quality detection method - Google Patents

Bearing deflection angle measuring method and tool thereof, and bearing installation quality detection method Download PDF

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CN113865515A
CN113865515A CN202010620567.4A CN202010620567A CN113865515A CN 113865515 A CN113865515 A CN 113865515A CN 202010620567 A CN202010620567 A CN 202010620567A CN 113865515 A CN113865515 A CN 113865515A
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bearing
measuring
normal vector
deflection angle
points
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CN113865515B (en
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范明争
连宇臣
黄振东
郑广昇
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AECC Commercial Aircraft Engine Co Ltd
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AECC Commercial Aircraft Engine Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C43/00—Assembling bearings
    • F16C43/04—Assembling rolling-contact bearings

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

The invention aims to provide a bearing deflection angle measuring method which can realize the measurement of the deflection angles of inner and outer rings of a bearing in an assembled state. It is another object of the present invention to provide a bearing deflection angle measuring tool. The invention further aims to provide a bearing installation quality detection method. To achieve the foregoing object, a bearing skew angle measuring method includes: measuring first jitter values of a plurality of points in the end surface of the inner ring by taking the measuring reference surface as a reference; measuring second jitter values of a plurality of points in the end face of the outer ring by taking the measuring reference surface as a reference; obtaining a normal vector N1 of a plane where a plurality of points in the inner ring end surface are located according to the first jitter value; obtaining a normal vector N2 of a plane where a plurality of points in the outer ring end face are located according to the second jitter value; the bearing inner and outer ring skew angles are calculated based on normal vector N1 and normal vector N2.

Description

Bearing deflection angle measuring method and tool thereof, and bearing installation quality detection method
Technical Field
The invention relates to a bearing inner and outer ring deflection angle measuring method and a measuring tool thereof.
Background
The bearing is an important component of the rotor of the aircraft engine, and the assembly quality of the bearing directly influences the operation safety of the aircraft engine. The roller bearing for aeroengine consists of rolling body, retainer, inner ring and outer ring, and the rolling body, retainer and inner ring are assembled into one integral through hot assembling process.
In order to check the assembly quality of the rear fulcrum rolling rod bearing during the assembly of the whole machine, the maximum value of the axial deflection angle of the inner ring and the outer ring of the bearing needs to be checked after the assembly, if the axial deflection angle exceeds a specified value, the bearing is unqualified to be assembled, and the bearing needs to be reassembled or replaced. In addition, the rotor of the engine is a high-speed rotating part, after the rotor works for a period of time, the maximum value of the axial deflection angle of the inner ring and the outer ring of the bearing in the complete machine state is also checked, and if the axial deflection angle exceeds a specified value, the bearing needs to be replaced.
The existing method for measuring the deflection angles of the inner ring and the outer ring of the bearing is to independently place the bearing in a measuring instrument for measurement, and a method for measuring the deflection angles of the inner ring and the outer ring of the bearing in an installation state is lacked. The inner and outer ring deflection angles of the rear fulcrum rolling rod bearing belong to the high-precision measurement category, and direct measurement cannot be realized. Therefore, a skew angle measuring method is needed to measure the skew angles of the inner ring and the outer ring of the bearing in an assembled state.
Disclosure of Invention
The invention aims to provide a bearing deflection angle measuring method which can realize the measurement of the deflection angles of inner and outer rings of a bearing in an assembled state.
Another object of the present invention is to provide a bearing deflection angle measuring tool that provides a basis for measuring the bearing inner and outer ring deflection angles in an assembled state.
The invention further aims to provide a bearing installation quality detection method, which is used for detecting the quality of the bearing in an assembly state.
To achieve the foregoing object, a bearing deflection angle measuring method for measuring a deflection angle between an axis of an inner ring of a bearing and an axis of an outer ring of the bearing, the bearing having a measuring side in an assembled state, a measuring tool measuring the bearing at the measuring side, the inner ring of the bearing having an inner ring end surface at the measuring side, the outer ring of the bearing having an outer ring end surface at the measuring side, the measuring tool having a measuring reference surface;
the method for measuring the deflection angle of the inner ring and the outer ring of the bearing comprises the following steps:
measuring first jitter values of a plurality of points in the end surface of the inner ring by taking the measuring reference surface as a reference;
measuring second jitter values of a plurality of points in the end surface of the outer ring by taking the measuring reference surface as a reference;
obtaining a normal vector N1 of a plane where a plurality of points in the inner ring end surface are located according to the first jitter value;
obtaining a normal vector N2 of a plane where a plurality of points in the outer ring end face are located according to the second jitter value;
and calculating the inner ring deflection angle and the outer ring deflection angle of the bearing according to the normal vector N1 and the normal vector N2.
In one or more embodiments, the bearing inner and outer ring deflection angle measurement method further includes:
selecting a first reference point on the measurement reference surface, wherein the measurement reference surface is provided with a reference center point, a straight line where a connecting line of the first reference point and the reference center point is located is taken as an X axis, a straight line where any line perpendicular to the X axis in a plane where the measurement reference surface is located is taken as a Y axis, and a normal line of the measurement reference surface at the reference center point is taken as a Z axis, so that a first coordinate system is defined;
the step of obtaining a normal vector N1 of a plane where a plurality of points in the inner ring end surface are located according to the first run-out value comprises the following steps:
expressing a first jitter value of the plurality of points in the first coordinate system as a first coordinate value of the plurality of points;
calculating a first plane equation of a plane where the plurality of points are located according to the first coordinate values of the plurality of points;
calculating a normal vector N01 of the first plane equation according to the first plane equation;
correcting the normal vector N01 to obtain a normal vector N1;
the step of obtaining a normal vector N2 of a plane where a plurality of points in the outer ring end surface are located according to the second run-out value comprises the following steps:
expressing the second jitter values of the plurality of points in the first coordinate system as second coordinate values of the plurality of points;
calculating a second plane equation of the plane where the plurality of points are located according to the second coordinate values of the plurality of points;
calculating a normal vector N02 of the second plane equation according to the second plane equation;
and correcting the normal vector N02 to obtain the normal vector N2.
In one or more embodiments, the bearing inner and outer ring deflection angle measurement method further includes:
selecting a first position point on the end surface of the inner ring, and measuring the perpendicularity P1 between the end surface of the inner ring and the outer peripheral surface of the inner ring of the bearing at the first position point;
recording an angular phase P1A of the first location point in the first coordinate system;
selecting a second position point on the outer ring end surface, and measuring the perpendicularity P2 between the outer ring end surface and the outer peripheral surface of the bearing outer ring at the second position point;
recording an angular phase P2A of the second location point in the first coordinate system;
correcting the normal vector N01 includes: correcting the normal vector N01 according to the perpendicularity P1 and the angle phase P1A to obtain a normal vector N1;
correcting the normal vector N02 includes: and correcting the normal vector N02 according to the perpendicularity P2 and the angle phase P2A to obtain the normal vector N2.
In one or more embodiments, the bearing inner and outer ring deflection angle measurement method further includes:
marking at the first location point and the second location point;
aligning the first position point and the second position point in a radial direction of the bearing before measurement.
To achieve the aforementioned another object, a bearing deflection angle measuring tool for measuring a deflection angle between an axis of an inner ring of a bearing and an axis of an outer ring of the bearing in an installed state, includes:
the bearing inner ring end face measuring device comprises a base body and a bearing outer ring end face measuring device, wherein the base body is provided with a measuring reference surface, a plurality of first measuring holes and a plurality of second measuring holes are formed in the measuring reference surface, and in a measuring state, the first measuring holes are arranged corresponding to the end face of the bearing inner ring, and the second measuring holes are arranged corresponding to the end face of the bearing outer ring;
the support piece is arranged on the seat body and provided with a lower end face matched with the measuring reference surface, at least one guide hole is formed in the support piece, and the guide hole is aligned with any one of the first measuring hole and/or the second measuring hole in a measuring state;
and the measuring unit is provided with at least one measuring head, and the measuring head abuts against the end face of the bearing inner ring and/or the end face of the bearing outer ring after penetrating through the guide hole and the first measuring hole and/or the second measuring hole aligned with the guide hole in a measuring state so as to measure the runout values of a plurality of points in the end face of the bearing inner ring and/or a plurality of points in the end face of the bearing outer ring relative to the measuring reference plane.
In one or more embodiments, the measurement unit is a dial indicator.
In one or more embodiments, the measurement tool is used to detect bearing skew angle in an aircraft engine;
the bearing is assembled with the turbine rear shaft in the installation state, and the base body is installed on the end face of the casing.
To achieve the foregoing object, a bearing installation quality detection method includes:
measuring the bearing deflection angle assembled with the rear shaft of the turbine by adopting the bearing deflection angle measuring method;
and judging the installation quality of the bearing according to the bearing deflection angle.
In one or more embodiments, the bearing skew angle measurement method further includes:
a force application part is adopted to apply force outwards along the radial direction on the inner side of the rear shaft of the turbine;
carrying out first measurement on a bearing deflection angle assembled with a rear shaft of the turbine;
the force application position is changed, and the inner side of the rear shaft of the turbine is applied with force outwards along the radial direction again;
measuring the bearing deflection angle assembled with the turbine rear shaft for the second time;
repeating the steps to obtain a plurality of groups of jitter values;
calculating the bearing deflection angle under the action of multiple lateral forces according to the multiple groups of run-out values;
judging the mounting quality of the bearing according to the maximum value of the deflection angles of the plurality of bearings;
wherein, be provided with pressure sensor in the application of force spare.
In one or more embodiments, the force is applied to the inside of the turbine rear shaft 8 times evenly along the inner peripheral side of the turbine rear shaft.
The gain effect of the present invention includes at least one of the following aspects:
the measurement of the deflection angle theta of the inner ring and the outer ring of the bearing is converted into the measurement of the end face of the inner ring and the end face of the outer ring of the bearing, and the calculated value of the deflection angle theta is obtained after formula conversion, so that the measurement of the deflection angle of the bearing in an assembly state is realized, and meanwhile, a basis is provided for the detection of the installation quality of the bearing in the assembly state.
Drawings
The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, in which:
FIG. 1 shows a schematic view of a bearing assembly during measurement;
FIG. 2 shows a partial schematic view of the bearing inner ring at the measurement side;
FIG. 3 shows a partial schematic view of a bearing outer ring at the measurement side;
FIG. 4 illustrates a schematic view of one embodiment of measuring a plurality of points on an end surface of an inner race of a bearing;
FIG. 5 is a schematic view of one embodiment of measuring a plurality of points on an outer ring end surface of a bearing;
FIG. 6 illustrates a perspective view of one embodiment of a housing;
FIG. 7 illustrates a perspective view of one embodiment of a support;
fig. 8 shows a schematic flow chart of an embodiment of a bearing installation quality detection method.
Detailed Description
The following discloses many different embodiments or examples for implementing the subject technology described. Specific examples of components and arrangements are described below to simplify the present disclosure, but these are merely examples and are not intended to limit the scope of the present disclosure. For example, if a first feature is formed over or on a second feature described later in the specification, this may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact. Additionally, reference numerals and/or letters may be repeated among the various examples throughout this disclosure. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. Further, when a first element is described as being coupled or coupled to a second element, the description includes embodiments in which the first and second elements are directly coupled or coupled to each other, as well as embodiments in which one or more additional intervening elements are added to indirectly couple or couple the first and second elements to each other.
It should be noted that, where used, the following description of upper, lower, left, right, front, rear, top, bottom, positive, negative, clockwise, and counterclockwise are used for convenience only and do not imply any particular fixed orientation. In fact, they are used to reflect the relative position and/or orientation between the various parts of the object.
It is noted that these and other figures which follow are merely exemplary and not drawn to scale and should not be considered as limiting the scope of the invention as it is actually claimed. Further, the conversion methods in the different embodiments may be appropriately combined.
It should be noted that the reference numerals described later and the reference numerals in the background art use different labeling systems, and there is no correlation between the reference numerals.
In one aspect of the invention, a bearing deflection angle measurement method is provided, and a support bearing adopted in an aircraft engine is provided with a bearing outer ring and a bearing inner ring, such as a rolling rod bearing. The angle that exists between the axis of the bearing outer ring and the axis of the bearing inner ring is referred to as the bearing skew angle.
Fig. 1 shows a schematic representation of a measurement in the assembled state of the bearing, wherein the bearing 1 has a measurement side 1a in the assembled state and the measurement tool 2 measures the bearing 1 on the measurement side 1 a.
Fig. 2 shows a partial schematic view of the bearing inner ring 11 on the measurement side 1a, and fig. 3 shows a partial schematic view of the bearing outer ring 12 on the measurement side 1 a. The bearing inner ring 11 has an inner ring end face 110 on the measuring side 1a, the bearing outer ring 12 has an outer ring end face 120 on the measuring side 1a, and the measuring tool 2 has a measuring reference surface 200.
The method for measuring the deflection angle of the inner ring and the outer ring of the bearing comprises the following steps:
firstly, measuring first jitter values of a plurality of points in the inner ring end surface 110 by taking the measuring reference surface 200 as a reference; and measuring second run-out values of a plurality of points in the outer ring end surface 120 with reference to the measurement reference plane 200.
Then, obtaining a normal vector N1 of a plane where a plurality of points in the inner ring end surface 110 are located according to the first jitter values of the plurality of points; and obtaining a normal vector N2 of the plane of the plurality of points in the outer ring end surface 120 according to the second run-out values of the plurality of points.
Finally, the inner and outer ring offset angles of the bearing are calculated from the normal vector N1 and the normal vector N2, specifically, the inner and outer ring offset angle θ of the bearing is calculated by the following equation (1).
Figure BDA0002562905580000061
The deflection angle measurement of the bearing in an assembly state is realized by converting the measurement of the deflection angle theta of the inner ring and the outer ring of the bearing into the measurement of the inner ring end surface 110 and the outer ring end surface 120 of the bearing and obtaining a calculated value of the deflection angle theta through formula conversion.
In one embodiment of the bearing deflection angle measurement method, the bearing inner and outer ring deflection angle measurement method further comprises the steps of:
a first reference point is selected on the measurement reference plane 200, which may be at any point in the measurement reference plane 200. There is a reference center point in the measurement reference plane 200. Specifically, the measurement reference plane 200 may be a polygonal plane or a circular plane, and the reference center point may be the geometric center of the plane. It is understood that the first reference point and the reference center point are two different points in the measurement reference plane 200. And taking a straight line on which a connecting line of the first reference point and the reference center point is positioned as an X axis, taking a straight line on which any line perpendicular to the X axis in a plane on which the measurement reference surface is positioned as a Y axis, taking a normal of the measurement reference surface at the reference center point as a Z axis, and defining a first coordinate system by using X, Y, Z axes together.
In one aspect, the first run-out values for a plurality of points in the inner ring end surface 110 are expressed in the defined first coordinate system as first coordinate values for the plurality of points. It will be appreciated that for each point in the inner ring end surface 110, there is a corresponding X, Y coordinate value in the XY plane of the first coordinate system, and that the runout value for each point corresponds to the Z coordinate value that becomes that point.
Then, a first plane equation of a plane where a plurality of points are located is calculated according to the first coordinate values of the plurality of points in the inner ring end surface 110. It will be appreciated that the first plane equation may be obtained by performing a fitting operation in a controller comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor being operable to perform the aforementioned calculation process when executing the computer program.
Subsequently, the normal vector N01 of the first plane equation is calculated according to the calculated first plane equation, and it is understood that the normal vector N01 may also be obtained by performing a fitting operation in a controller, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor can implement the aforementioned calculation process when executing the computer program.
Finally, the normal vector N1 is obtained by correcting the N01, and the step of obtaining the normal vector N1 of the plane where the plurality of points in the inner ring end surface 110 are located is completed according to the first run-out value.
On the other hand, the second run-out values of a plurality of points in the outer ring end surface 120 are expressed in the defined first coordinate system as second coordinate values of the plurality of points. It will be appreciated that for each point in the outer annular end surface 120, there is a corresponding X, Y coordinate value in the XY plane of the first coordinate system, and that the runout value for each point corresponds to the Z coordinate value for that point.
Then, a second plane equation of the plane of the plurality of points is calculated according to the second coordinate values of the plurality of points in the outer ring end surface 120. It will be appreciated that the second plane equation may be obtained by performing a fitting operation in a controller comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor being operable to perform the aforementioned calculation process when executing the computer program.
Subsequently, the normal vector N02 of the second plane equation is calculated according to the calculated second plane equation, and it is understood that the normal vector N02 may also be obtained by performing a fitting operation in a controller, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor may implement the foregoing calculation process when executing the computer program.
Finally, the normal vector N2 is obtained by correcting the N02, and the step of obtaining the normal vector N2 of the plane where the plurality of points in the outer ring end surface 120 are located is completed according to the second run-out value.
In one other embodiment, the calculations for the first plane equation, the second plane equation, normal vector N1, and normal vector N2 may all be obtained using simulation software.
In one embodiment of the bearing deflection angle measurement method, the bearing inner and outer ring deflection angle measurement method further comprises the steps of:
a first position point, which may be any point on the inner ring end surface 110, is selected in the inner ring end surface 110, and the perpendicularity P1 between the inner ring end surface 110 and the bearing inner ring outer peripheral surface 111 is measured at the first position point. Simultaneously with the measurement, the angular phase P1A of the first position point in the first coordinate system is recorded, which angular phase P1A records the distance and angle of the first position point in the first coordinate system from the origin of the coordinate.
A second position point, which may be any point on the outer ring end surface 120, is selected in the outer ring end surface 120, and the perpendicularity P2 between the outer ring end surface 120 and the bearing inner ring outer peripheral surface 121 is measured at the second position point. Simultaneously with the measurement, the angular phase P2A of the second position point in the first coordinate system is recorded, which angular phase P2A records the distance and angle of the second position point in the first coordinate system from the origin of the coordinate.
Subsequently, the normal vector N01 is corrected according to the perpendicularity P1 and the angular phase P1A to obtain a corrected normal vector N1, specifically, a correction matrix T1(P1, P1A) is obtained through the perpendicularity P1 and the angular phase P1A, and a corrected normal vector N1 is obtained by using the following correction formula (2):
N1＝T1·N01 (2)
correcting the normal vector N02 according to the perpendicularity P2 and the angular phase P2A to obtain a corrected normal vector N2, specifically, obtaining a correction matrix T2(P2, P2A) through the perpendicularity P2 and the angular phase P2A, and obtaining a corrected normal vector N2 by adopting a correction formula (3) as follows:
N2＝T2·N02 (3)
because the perpendicularity between the inner ring end face 110 and the bearing inner ring outer peripheral face 111 and the perpendicularity between the outer ring end face 120 and the bearing inner ring outer peripheral face 121 are not completely perpendicular in an actual state, the measured normal vector N01 and the measured normal vector N02 are corrected through the correction matrix T1(P1, P1A) and the correction matrix T2(P2, P2A), the calculated normal vectors of the first plane equation and the second plane equation can be converted into the axes of the actual bearing inner ring 11 and the actual bearing outer ring 12, and therefore the measured skew angle theta can be further guaranteed to be closer to an actual value in an assembly state, and the measurement accuracy is improved.
In an embodiment different from the foregoing embodiment, the correction of the skew angle θ may be performed after the calculation is completed.
In one embodiment of the bearing deflection angle measurement method, the method further comprises marking the first position point and the second position point, such as with a marker. And before measurement, the first position point and the second position point are aligned in the radial direction of the bearing, so that the included angle between the first position point and the positive direction of the X axis in the first coordinate system is the same, and the calculation process is simplified.
To further illustrate the present bearing deflection angle measurement method, the specific steps of the present bearing deflection angle measurement method are further described below for an exemplary embodiment.
As shown in fig. 4, the points qn1 to qn12 are first coordinate values corresponding to a first coordinate system in which 12 points are located, which are measured in the inner ring end surface 110. And obtaining a fitting plane Qn of the points Qn 1-Qn 12 through a fitting algorithm, and obtaining a first plane equation of the Qn. And then, calculating to obtain a normal vector N01' of the first plane equation, and correcting the normal vector N01' to obtain a normal vector N1 '.
As shown in fig. 5, the points qw1 through qw12 are second coordinate values measured on the outer ring end surface 120 and corresponding to the first coordinate system having 12 points. And obtaining a fitting plane Qw of the points Qw 1-Qw 12 through a fitting algorithm, and obtaining a second plane equation of the Qw. And then, calculating to obtain a normal vector N02' of the second plane equation, and correcting the normal vector N02' to obtain a normal vector N2 '.
Finally, by the formula
Figure BDA0002562905580000101
And obtaining the deflection angle theta' of the inner ring and the outer ring of the bearing.
It will be appreciated that the above embodiments are merely exemplary, and that there may be many reasonable variations in the specific measurements, such as other numbers of points may be measured in the inner ring end face 110 and the outer ring end face 120 in one embodiment.
Another aspect of the present invention provides a bearing deflection angle measuring tool for measuring a deflection angle between an axis of an inner ring of a bearing and an axis of an outer ring of the bearing in an installed state as shown in fig. 1.
The bearing deflection angle measuring tool 2 includes a base 20, a support 21, and a measuring unit 22. Fig. 6 is a perspective view of one embodiment of the seat 20, and fig. 7 is a perspective view of one embodiment of the supporting member 21.
The base 20 has a measurement reference plane 200, and a plurality of first measurement holes 201 and a plurality of second measurement holes 202 are formed in the measurement reference plane 200. In the measuring state shown in fig. 1, the first measuring hole 201 is disposed corresponding to the bearing inner ring end surface 110, and the second measuring hole 202 is disposed corresponding to the bearing outer ring end surface 120.
The supporting member 21 is disposed on the base 20 as shown in the figure, and has a lower end surface 210 matched with the measuring reference surface 200, wherein a guiding hole 211 is opened therein, and the number of the guiding holes 211 may be one as shown in fig. 7 or may be other numbers such as two or more. The guide hole 211 is aligned with any of the first measuring hole 201 and/or the second measuring hole 202 in the measuring state as shown in fig. 1.
The measuring unit 22 has measuring heads 221, wherein the number of measuring heads 221 can be one as shown in the figure, and correspondingly the number of guide holes 211 is also one. In an embodiment different from the illustrated embodiment, the number of the measuring heads 221 may be multiple, and correspondingly, the guide holes 211 are opened with the same number, in another embodiment, the number of the guide holes 211 is multiple, the number of the measuring heads 221 is one, and the synchronous measurement of multiple points is realized by arranging multiple measuring units 22.
With reference to fig. 1, in the measurement state, the measurement head 221 passes through the guide hole 211 and the first measurement hole 201 and/or the second measurement hole 202 aligned with the guide hole, and then abuts against the bearing inner ring end surface 110 and/or the bearing outer ring end surface 120 at the corresponding position, so as to measure runout values of a plurality of points in the bearing inner ring end surface 110 and/or a plurality of points in the bearing outer ring end surface 120 relative to the measurement reference plane 200.
Specifically, in use, according to the position to be measured, the measuring head is correspondingly inserted into the aligned first measuring hole 201 and/or second measuring hole 202 and the guide hole 211, so that the measuring head can measure a plurality of points in the bearing inner ring end surface 110 and a plurality of points in the bearing outer ring end surface 120 along a circle. In an embodiment different from that shown, a plurality of points in the bearing inner ring end surface 110 and a plurality of points in the bearing outer ring end surface 120 may be measured simultaneously using a plurality of measuring units 22 or using a measuring unit having a plurality of measuring heads 221.
In one embodiment of the bearing skew angle measuring tool, the measuring unit 22 is a dial indicator, and in some other embodiments, the measuring unit 22 may also be a dial indicator.
In one embodiment of the bearing skew angle measuring tool, the bearing skew angle measuring tool is applied to a tool for detecting bearing skew angle in an aircraft engine as shown in fig. 1, wherein the bearing 1 is assembled with the turbine rear shaft 6 in an assembled state as shown in fig. 1. The housing 20 is mounted to an end surface of the casing 7 by means of fasteners, for example.
In another aspect of the present invention, a bearing installation quality detection method is provided, and fig. 8 is a schematic flow chart of an embodiment of the bearing installation quality detection method.
The bearing installation quality detection method comprises the following steps:
s101: receiving a bearing;
s102: measuring the perpendicularity P1 of the bearing inner ring 11, and recording the angular phase P1A of the measured position;
s103: measuring the perpendicularity P2 of the bearing outer ring 12 and recording the angular phase P2A of the measured position;
s104: assembling the bearing into an assembled state;
s106: measuring the jumping values of a plurality of positions on the end surface of the bearing outer ring 12;
s107: measuring the jumping values of a plurality of positions on the end surface of the bearing inner ring 11:
s111: and judging the installation quality of the bearing according to the calculated bearing deflection angle.
It should be noted that the execution order of the steps 101-111 is not necessarily sequential, but may be different according to different implementation modes. For example, step 102 may be performed first, or after step 103 is performed, and the two steps may be performed alternately. For example, step 106 may be performed first, or after step 107 is performed, and the two steps may be performed alternately.
In one embodiment of the bearing installation quality detection method, the method further comprises:
s105, applying lateral force to the turbine rear shaft, specifically, applying force outwards along the radial direction on the inner side of the turbine rear shaft by using a force application member 5 shown in FIG. 1;
subsequently, steps S106 to S107 are continued: and respectively measuring the run-out values of a plurality of positions of the end surface of the bearing outer ring 12 and the end surface of the bearing inner ring 11.
Step S108 is then performed: and judging whether the force application times reach a preset value n times, if not, replacing the force application position, applying force to the inner side of the rear shaft of the turbine along the radial direction outwards again, and then, respectively carrying out secondary measurement on the end surface of the bearing outer ring 12 and the end surface of the bearing inner ring 11 in the steps S106-S107 which are continuously executed. And repeating the operation until the force application times reach a preset value n times, and obtaining a plurality of groups of jumping value data.
And step S109 is executed, and the bearing deflection angles under the action of a plurality of times of lateral force are respectively calculated according to the measured data of the plurality of groups of run-out values.
Then, step S110 is executed, and the bearing deflection angle theta under the action of multiple lateral forces is obtained through solving1～nMaximum value of (a)max。
Finally, according to step S111, the bearing deflection angle theta is calculated according to a plurality of bearing deflection angles1～nMaximum value of (a)maxAnd judging the installation quality of the bearing.
Wherein, a pressure sensor is arranged in the force application member 5 to control the magnitude of the applied lateral force.
In one embodiment of the bearing installation quality detection method, the preset value n of the force application times is 8 times, and 8 times of force application is respectively and uniformly carried out on the inner side of the rear shaft of the turbine. In some other embodiments, the number of applications of force may also be based on actual measurement requirements.
In one embodiment, the foregoing one or more bearing deflection angle measurement methods are preferably used for measuring a bearing having a bearing end face with a high perpendicularity to the outer ring face of the bearing.
The gain effect of the present invention includes at least one of the following aspects:
the measurement of the deflection angle theta of the inner ring and the outer ring of the bearing is converted into the measurement of the end face of the inner ring and the end face of the outer ring of the bearing, and the calculated value of the deflection angle theta is obtained after formula conversion, so that the measurement of the deflection angle of the bearing in an assembly state is realized, and meanwhile, a basis is provided for the detection of the installation quality of the bearing in the assembly state.
Although the present invention has been disclosed in terms of the preferred embodiment, it is not intended to limit the invention, and variations and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention. Therefore, any modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope defined by the claims of the present invention, unless the technical essence of the present invention departs from the content of the present invention.

Claims (10)

1. A bearing deflection angle measuring method for measuring a deflection angle between a bearing inner ring axis and a bearing outer ring axis, characterized in that the bearing has a measuring side in an assembled state, a measuring tool measures the bearing at the measuring side, the bearing inner ring has an inner ring end face at the measuring side, the bearing outer ring has an outer ring end face at the measuring side, the measuring tool has a measuring reference plane;
the method for measuring the deflection angle of the inner ring and the outer ring of the bearing comprises the following steps:
measuring first jitter values of a plurality of points in the end surface of the inner ring by taking the measuring reference surface as a reference;
measuring second jitter values of a plurality of points in the end surface of the outer ring by taking the measuring reference surface as a reference;
obtaining a normal vector N1 of a plane where a plurality of points in the inner ring end surface are located according to the first jitter value;
obtaining a normal vector N2 of a plane where a plurality of points in the outer ring end face are located according to the second jitter value;
and calculating the inner ring deflection angle and the outer ring deflection angle of the bearing according to the normal vector N1 and the normal vector N2.
2. The method of claim 1, wherein the method of measuring bearing inner and outer race skew angle further comprises:
selecting a first reference point on the measurement reference surface, wherein the measurement reference surface is provided with a reference center point, a straight line where a connecting line of the first reference point and the reference center point is located is taken as an X axis, a straight line where any line perpendicular to the X axis in a plane where the measurement reference surface is located is taken as a Y axis, and a normal line of the measurement reference surface at the reference center point is taken as a Z axis, so that a first coordinate system is defined;
the step of obtaining a normal vector N1 of a plane where a plurality of points in the inner ring end surface are located according to the first run-out value comprises the following steps:
expressing a first jitter value of the plurality of points in the first coordinate system as a first coordinate value of the plurality of points;
calculating a first plane equation of a plane where the plurality of points are located according to the first coordinate values of the plurality of points;
calculating a normal vector N01 of the first plane equation according to the first plane equation;
correcting the normal vector N01 to obtain a normal vector N1;
the step of obtaining a normal vector N2 of a plane where a plurality of points in the outer ring end surface are located according to the second run-out value comprises the following steps:
expressing the second jitter values of the plurality of points in the first coordinate system as second coordinate values of the plurality of points;
calculating a second plane equation of the plane where the plurality of points are located according to the second coordinate values of the plurality of points;
calculating a normal vector N02 of the second plane equation according to the second plane equation;
and correcting the normal vector N02 to obtain the normal vector N2.
3. The method of bearing deflection angle measurement according to claim 2, wherein the method of bearing inner and outer race deflection angle measurement further comprises:
selecting a first position point on the end surface of the inner ring, and measuring the perpendicularity P1 between the end surface of the inner ring and the outer peripheral surface of the inner ring of the bearing at the first position point;
recording an angular phase P1A of the first location point in the first coordinate system;
selecting a second position point on the outer ring end surface, and measuring the perpendicularity P2 between the outer ring end surface and the outer peripheral surface of the bearing outer ring at the second position point;
recording an angular phase P2A of the second location point in the first coordinate system;
correcting the normal vector N01 includes: correcting the normal vector N01 according to the perpendicularity P1 and the angle phase P1A to obtain a normal vector N1;
correcting the normal vector N02 includes: and correcting the normal vector N02 according to the perpendicularity P2 and the angle phase P2A to obtain the normal vector N2.
4. The method of claim 3, wherein the method of measuring bearing inner and outer race skew angle further comprises:
marking at the first location point and the second location point;
aligning the first position point and the second position point in a radial direction of the bearing before measurement.
5. A bearing deflection angle measuring tool for measuring a deflection angle between an axis of a bearing inner ring and an axis of a bearing outer ring in a mounted state, comprising:
the bearing inner ring end face measuring device comprises a base body and a bearing outer ring end face measuring device, wherein the base body is provided with a measuring reference surface, a plurality of first measuring holes and a plurality of second measuring holes are formed in the measuring reference surface, and in a measuring state, the first measuring holes are arranged corresponding to the end face of the bearing inner ring, and the second measuring holes are arranged corresponding to the end face of the bearing outer ring;
the support piece is arranged on the seat body and provided with a lower end face matched with the measuring reference surface, at least one guide hole is formed in the support piece, and the guide hole is aligned with any one of the first measuring hole and/or the second measuring hole in a measuring state;
and the measuring unit is provided with at least one measuring head, and the measuring head abuts against the end face of the bearing inner ring and/or the end face of the bearing outer ring after penetrating through the guide hole and the first measuring hole and/or the second measuring hole aligned with the guide hole in a measuring state so as to measure the runout values of a plurality of points in the end face of the bearing inner ring and/or a plurality of points in the end face of the bearing outer ring relative to the measuring reference plane.
6. The bearing deflection angle measuring tool of claim 5, wherein the measuring unit is a dial gauge.
7. The bearing deflection angle measurement tool of claim 5, wherein the measurement tool is used to detect bearing deflection angle in an aircraft engine;
the bearing is assembled with the turbine rear shaft in the installation state, and the base body is installed on the end face of the casing.
8. A bearing installation quality detection method is characterized by comprising the following steps:
measuring a bearing deflection angle assembled with a turbine rear axle by using the bearing deflection angle measuring method according to any one of claims 1 to 4;
and judging the installation quality of the bearing according to the bearing deflection angle.
9. The bearing installation quality inspection method of claim 8, further comprising:
a force application part is adopted to apply force outwards along the radial direction on the inner side of the rear shaft of the turbine;
carrying out first measurement on a bearing deflection angle assembled with a rear shaft of the turbine;
the force application position is changed, and the inner side of the rear shaft of the turbine is applied with force outwards along the radial direction again;
measuring the bearing deflection angle assembled with the turbine rear shaft for the second time;
repeating the steps to obtain a plurality of groups of jitter values;
calculating the bearing deflection angle under the action of multiple lateral forces according to the multiple groups of run-out values;
judging the mounting quality of the bearing according to the maximum value of the deflection angles of the plurality of bearings;
wherein, be provided with pressure sensor in the application of force spare.
10. The bearing installation quality inspection method according to claim 9, wherein the force is applied to the inside of the turbine rear shaft 8 times evenly along the inner peripheral side of the turbine rear shaft.
CN202010620567.4A 2020-06-30 2020-06-30 Bearing deflection angle measuring method and tool thereof, and bearing installation quality detecting method Active CN113865515B (en)

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