CN112254940A - Testing device and testing method for axle fatigue test - Google Patents
Testing device and testing method for axle fatigue test Download PDFInfo
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- CN112254940A CN112254940A CN201910604503.2A CN201910604503A CN112254940A CN 112254940 A CN112254940 A CN 112254940A CN 201910604503 A CN201910604503 A CN 201910604503A CN 112254940 A CN112254940 A CN 112254940A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0023—Bending
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0032—Generation of the force using mechanical means
- G01N2203/0037—Generation of the force using mechanical means involving a rotating movement, e.g. gearing, cam, eccentric, or centrifuge effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0266—Cylindrical specimens
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a testing device and a testing method for an axle fatigue test, wherein the testing device comprises: a foundation; a motor; a driving shaft connected with an output shaft of the motor; 2 supporting seats for mounting the axle and enabling the axle to be parallel to the driving shaft; 2 first driving shaft belt pulleys which are arranged on the driving shaft in a central symmetry manner and 2 first driven shaft belt pulleys which are correspondingly arranged on the axle through a first bearing, wherein the first driving shaft belt pulleys and the first driven shaft belt pulleys are linked through a belt; 2 first eccentric masses mounted centrosymmetrically on a first bearing; 2 second driving shaft belt pulleys which are arranged on the driving shaft in a central symmetry mode and 2 second driven shaft belt pulleys which are correspondingly arranged on the axle through a first bearing are linked through a belt; and 2 second eccentric masses arranged centrosymmetrically on the second bearing, the first eccentric mass and the second eccentric mass being 180 DEG out of phase.
Description
Technical Field
The invention relates to a testing device and a testing method for an axle fatigue test.
Background
At present, the test beds usually adopted for carrying out the axle fatigue test at home and abroad comprise a vertical test bed and a horizontal test bed. For both test beds, the bending moment applied to the axle section is proportional to the distance between the section and the motor. The bending moment diagram of the axle running on the actual line under the non-traction braking working condition is approximately trapezoidal, and the bending moment between the wheel seats is basically a constant value. Therefore, the existing wheel axle fatigue test bed cannot simulate the stress state of the axle in the actual line operation. With the rapid development of high-speed railway trains in China, the axle fatigue test testing device capable of simulating the stress state of the axle in the running process of an actual line is provided, and has important and profound significance for the comprehensive test research of the system of the high-speed railway axle.
Disclosure of Invention
In view of the above, the present invention provides a testing apparatus and a testing method for an axle fatigue test, which can simulate the stress state of an axle during actual line operation.
The purpose of the invention is realized by the following technical scheme.
In one aspect, the present invention provides a testing apparatus for an axle fatigue test, wherein the testing apparatus includes:
a foundation;
a motor mounted on the foundation;
the driving shaft is installed on the foundation through 2 bearing seats and is connected with an output shaft of the motor through a coupler;
2 supporting seats for mounting the axle, wherein the supporting seats are arranged on the foundation and are arranged so that the axle is parallel to the driving shaft;
the first driven shaft belt pulley is symmetrically arranged on a wheel seat area of the axle along the axle center through a first bearing, the first driven shaft belt pulley corresponds to the first driving shaft belt pulley in position, and the first driving shaft belt pulley and the first driven shaft belt pulley corresponding to the first driving shaft belt pulley are linked through a belt;
2 first eccentric masses mounted on said first bearing centrally symmetrically along the axle;
the second driving shaft belt pulleys are symmetrically arranged on the driving shaft along the center of the driving shaft, the second driven shaft belt pulleys are symmetrically arranged on the end part area of the axle along the center of the axle through second bearings, the second driven shaft belt pulleys correspond to the second driving shaft belt pulleys in position, and the second driving shaft belt pulleys and the second driven shaft belt pulleys corresponding to the second driving shaft belt pulleys are linked through belts; and
2 second eccentric masses mounted on said second bearing centrally symmetrically along the axle;
wherein 2 first eccentric masses have the same phase, 2 second eccentric masses have the same phase, and the first eccentric masses are different from the second eccentric masses disposed at the same end of the axle in phase by 180 °.
Further, the testing device also includes an axle having an extended end.
Furthermore, the first driving shaft belt pulley is positioned on the inner side of the bearing seat, and the second driving shaft belt pulley is positioned on the outer side of the bearing seat.
Further, the supporting seat, the second eccentric mass block, the second driven shaft pulley, the first eccentric mass block, and the first driven shaft pulley are sequentially arranged along the direction from the two ends of the axle to the center thereof.
Furthermore, the second driving shaft belt pulley, the bearing seat and the first driving shaft belt pulley are sequentially arranged along the direction from the two ends of the driving shaft to the center of the driving shaft.
Furthermore, the driving shaft is a stepped shaft with two symmetrical ends.
In another aspect, the present invention provides a method for testing an axle fatigue test, the method being performed on the testing apparatus, wherein the method comprises the steps of:
(1) mounting 2 first driven shaft pulleys and 2 first eccentric masses to a wheel seat area of an axle via a first bearing symmetrically along the axle center, mounting a belt, wherein the phases of the 2 first eccentric masses are the same;
(2) mounting 2 second driven shaft pulleys and 2 second eccentric masses to an end region of an axle via a second bearing, symmetrically along the axle center, a belt, wherein the 2 second eccentric masses are the same phase and the first eccentric mass is 180 ° out of phase with a second eccentric mass disposed at the same end of the axle;
(3) mounting the axle on the support seat;
(4) and the motor is started, the first driven shaft belt pulley, the second driven shaft belt pulley and the second driven shaft belt pulley drive the first eccentric mass block and the second eccentric mass block to rotate, and the rotating first eccentric mass block and the rotating second eccentric mass block apply rotating bending load to the axle based on a resonance principle.
The testing device and the testing method for the axle fatigue test can simulate the stress state of the axle in the actual circuit operation, and further can more accurately assess whether the fatigue strength of the part to be inspected meets the standard requirement.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of an axle load;
FIG. 2 is an axle bending moment diagram;
FIG. 3 is a perspective view of one embodiment of a test device of the present invention;
FIG. 4 is a top view of one embodiment of a test device of the present invention;
FIG. 5 is a cross-sectional view of one embodiment of the test apparatus of the present invention taken along the longitudinal centerline of the axle.
Wherein the figures include the following reference numerals:
1-motor, 2-coupling, 3-bearing block, 4-foundation, 5-driving shaft, 6-belt, 7-first driving shaft pulley, 8-bearing block, 9-first eccentric mass, 10-first driven shaft pulley, 11-axle, 12-second eccentric mass, 13-first bearing, 14-second driving shaft pulley, 15-second driven shaft pulley, 16-second bearing.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
With reference to fig. 1, which shows a simplified diagram of the stress conditions of a wheel set in non-braking traction conditions during actual line operation, neglecting the effect of the unsprung mass of the axle 11 between the two wheels, wherein F1And F2Vertical load, Q, to the left and right axle boxesij(i-X, Y, Z; j-1, 2) is the component of the wheel-rail interaction force along axis X, Y, Z. Further, fig. 2 shows a bending moment diagram of the axle, in which the bending moment is gradually decreased from 0 from the left side axle box to the left side wheel seat, the bending moment is kept constant between the left side wheel seat and the right side wheel seat, and the bending moment is gradually increased to 0 from the right side wheel seat to the right side axle box.
In one aspect, the present invention provides a testing apparatus for an axle fatigue test, capable of simulating a stress state of an axle when an actual line runs, wherein the testing apparatus includes:
a foundation;
a motor mounted on the foundation;
the driving shaft is installed on the foundation through 2 bearing seats and is connected with an output shaft of the motor through a coupler;
2 supporting seats for mounting the axle, wherein the supporting seats are arranged on the foundation and are arranged so that the axle is parallel to the driving shaft;
the first driven shaft belt pulley is symmetrically arranged on a wheel seat area of the axle along the axle center through a first bearing, the first driven shaft belt pulley corresponds to the first driving shaft belt pulley in position, and the first driving shaft belt pulley and the first driven shaft belt pulley corresponding to the first driving shaft belt pulley are linked through a belt;
a first eccentric mass with 2 axles mounted centrally symmetrically on the first bearing;
the second driving shaft belt pulleys are symmetrically arranged on the driving shaft along the center of the driving shaft, the second driven shaft belt pulleys are symmetrically arranged on the end part area of the axle along the center of the axle through second bearings, the second driven shaft belt pulleys correspond to the second driving shaft belt pulleys in position, and the second driving shaft belt pulleys and the second driven shaft belt pulleys corresponding to the second driving shaft belt pulleys are linked through belts;
a second eccentric mass with 2 axles mounted centrally symmetrically on the second bearing;
wherein 2 first eccentric masses have the same phase, 2 second eccentric masses have the same phase, and the first eccentric masses are different from the second eccentric masses disposed at the same end of the axle in phase by 180 °.
As shown in fig. 3 to 5, the testing device for the axle fatigue test of the present invention includes a foundation 4, a motor 1, a driving shaft 5, a coupling 2, 2 bearing blocks 3, 2 bearing blocks 8, 2 first driving shaft pulleys 7, 2 first driven shaft pulleys 10, a first bearing 13, a belt 6, 2 first eccentric mass blocks 9, 2 second driving shaft pulleys 14, 2 second driven shaft pulleys 15, a second bearing 16, and 2 second eccentric mass blocks 12.
The motor 1 is mounted on a foundation 4. The driving shaft 5 is installed on the foundation 4 through 2 bearing seats 3, and the driving shaft 5 is connected with an output shaft of the motor 1 through a coupler 2.
The bearing block 8 is provided on the foundation 4 for mounting the axle 11, and the bearing block 8 is provided so that the axle 11 is parallel to the axle shaft 5.
2 first driving shaft belt pulleys 7 are symmetrically installed on the driving shaft 5 along the driving shaft center, 2 first driven shaft belt pulleys 10 are symmetrically installed on the wheel seat area of the axle 11 along the axle center through 2 first bearings 13, 2 first driven shaft belt pulleys 10 correspond to 2 first driving shaft belt pulleys 7 in position, and the first driving shaft belt pulleys 7 and the first driven shaft belt pulleys 10 corresponding to the first driving shaft belt pulleys are linked through the belt 6.
The 2 first eccentric masses 9 are mounted symmetrically on a first bearing 13 along the axle center.
2 second driving shaft pulleys 14 are installed on the driving shaft 5 symmetrically along the driving shaft center, and 2 second driven shaft pulleys 15 are installed on the end region (or axle box region) of the axle 11 symmetrically along the axle center via 2 second bearings 16. The 2 second driven shaft pulleys 15 correspond in position to the 2 second driving shaft pulleys 14, and the second driving shaft pulleys 14 and the second driven shaft pulleys 15 corresponding thereto are linked via the belt 6.
The 2 second eccentric masses 12 are mounted on a second bearing 16 centrally symmetrically along the axle.
During installation, the phases of the 2 first eccentric masses 9 are identical, the phases of the 2 second eccentric masses 12 are identical, and the phases of the first eccentric masses 9 and the second eccentric masses 12 arranged at the same end of the axle 11 differ by 180 °.
The vehicle body normally applies a load to the axle through the axle box. In actual line operation, the axle rotates while the direction of the load applied to the axle by the vehicle body through the axle boxes is substantially unchanged. In the test apparatus of the present invention, the axle is fixed, and the rotational bending load is generated by the load rotation. Specifically, when carrying out the axletree fatigue test, motor 1 passes through shaft coupling 2 and drives driving shaft 5 rotatory, 2 first driving shaft belt pulleys 7 and 2 second driving shaft belt pulleys 14 installed on driving shaft 5 drive corresponding belt 6 rotatory, belt 6 drives first driven shaft belt pulley 10 and second driven shaft belt pulley 15 rotatory, thereby it is rotatory to drive first eccentric quality piece 9 of installing on first bearing 13 and the second eccentric quality piece 12 of installing on second bearing 16, first eccentric quality piece 9 and second eccentric quality piece 12 produce centrifugal force at rotatory in-process, thereby form rotatory bending load. At each moment, the axle 11 is subjected to the centrifugal forces of 4 eccentric masses, 2 first eccentric masses 9 and 2 second eccentric masses 12, the centrifugal forces in the end regions of the axle being in the opposite direction to the centrifugal forces in the wheel-seat region, the axle 11 being subjected to a bending moment similar to that shown in fig. 2. Therefore, the test device of the invention can simulate the rotating bending load when the actual line of the axle runs. Further, when the actual circuit runs, the load applied to the axle is a rotating bending load. The invention adopts a load rotation mode and utilizes the eccentric mass block to generate a rotation bending load. Compared with an axle rotating mode, the load rotating mode is adopted, the motor power can be greatly reduced by utilizing the resonance principle, and the energy consumption is low.
According to some embodiments of the invention, the testing device of the invention further comprises an axle 5, the axle 5 having an extended end.
For practical axles, the distance between the axle housing and the wheel seat is relatively short, while the load exerted by the vehicle body in the region of the axle housing is relatively large, whereby the required eccentric mass is generally relatively large and its outer dimensions are correspondingly large. In the invention, the size of the eccentric mass block, particularly the second eccentric mass block, is reduced by lengthening the two ends of the axle, thereby increasing the moment arm.
Lengthening the ends of the axle results in a smaller absolute value of the slope in the moment diagram, but for axles where the bending moment is greatest in the middle, the areas of the axle most susceptible to failure are concentrated in the middle, particularly in the wheel-seat area, and the moment in the middle area of the axle is not altered by lengthening the ends.
According to some embodiments of the invention, the first axle pulley 7 is disposed inside the bearing housing 3 and the second axle pulley 14 is disposed outside said bearing housing 3.
According to some embodiments of the invention, the bearing support 8, the second eccentric mass 12, the second driven shaft pulley 15, the first eccentric mass 9 and the first driven shaft pulley 10 are arranged in sequence along the two ends of the axle 5 towards the centre thereof.
According to some embodiments of the present invention, the rotational bending load to which the axle 11 is subjected during operation of an actual line can be simulated by adjusting the counterweights of the first and second eccentric masses 9, 12, the rotational speed of the motor 1, and the distance of the second eccentric masses 12 mounted at the end regions.
According to some embodiments of the invention, the first eccentric mass 9 is fixed to the first bearing 13 via a fixing ring (not shown). Correspondingly, the second eccentric mass 12 is fixed to the second bearing 16 via a fixing ring (not shown).
According to some embodiments of the present invention, the second driving shaft pulley 14, the bearing housing 3 and the first driving shaft pulley 7 are sequentially arranged along both ends of the driving shaft 5 toward the center thereof.
According to some embodiments of the present invention, the driving shaft 5 is a stepped shaft having two symmetrical ends.
According to some embodiments of the present invention, the first drive pulley 7 and the second drive pulley 14 have different bore diameters.
According to some embodiments of the invention, the motor 1, the bearing housing 3 and the bearing housing 8 are mounted to the foundation 4 via bolts.
In another aspect, the present invention further provides a method for testing an axle fatigue test, where the method is performed on the testing apparatus, and the method includes the following steps:
(1) mounting 2 first driven shaft pulleys 10 and 2 first eccentric masses 9 via first bearings 13 to the wheel seat region of the axle 11 centrally symmetrically along the axle, mounting a belt, wherein the phases of the 2 first eccentric masses 9 are identical;
(2) mounting 2 second driven shaft pulleys 15 and 2 second eccentric masses 12 to an end region of the axle 11 via second bearings 16 symmetrically along the axle center, a belt being mounted, wherein the 2 second eccentric masses 12 are in phase and the first eccentric mass 9 is 180 ° out of phase with the second eccentric mass 12 arranged at the same end of the axle 11;
(3) mounting the axle 11 on the bearing block 8;
(4) starting the motor 1, driving the first eccentric mass block 9 and the second eccentric mass block 12 to rotate via the first driving shaft belt pulley 7, the first driven shaft belt pulley 10, the second driving shaft belt pulley 14 and the second driven shaft belt pulley 15, and applying a rotational bending load to the axle 11 by the first eccentric mass block 9 and the second eccentric mass block 12 based on a resonance principle.
Compared with the existing axle fatigue test bed, the axle fatigue test device provided by the invention can simulate the stress state of an axle in the operation of an actual circuit, and can more accurately check whether the fatigue strength of a part to be inspected meets the standard requirement.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A test device for an axle fatigue test, wherein the test device comprises:
a foundation (4);
a motor (1), said motor (1) being mounted on said foundation (4);
the driving shaft (5) is installed on the foundation (4) through 2 bearing seats (3), and the driving shaft (5) is connected with an output shaft of the motor (1) through a coupler (2);
2 bearing blocks (8) for mounting an axle (11), said bearing blocks (8) being arranged on said foundation (4) and said bearing blocks (8) being arranged so that said axle (11) is parallel to said axle shaft (5);
the first driving shaft belt pulleys (7) are symmetrically arranged on the driving shaft (5) along the center of the driving shaft, the first driven shaft belt pulleys (10) are symmetrically arranged on the wheel seat area of the axle (11) along the center of the axle through first bearings (13), the first driven shaft belt pulleys (10) correspond to the first driving shaft belt pulleys (7) in position, and the first driving shaft belt pulleys (7) and the first driven shaft belt pulleys (10) corresponding to the first driving shaft belt pulleys are linked through belts (6);
2 first eccentric masses (9) mounted on the first bearing (13) symmetrically about the axle center;
2 second driving shaft belt pulleys (14) and 2 second driven shaft belt pulleys (15), wherein the second driving shaft belt pulleys (14) are symmetrically installed on the driving shaft (5) along the center of the driving shaft, the second driven shaft belt pulleys (15) are symmetrically installed on the end part area of the axle (11) along the center of the axle through second bearings (16), the second driven shaft belt pulleys (15) correspond to the second driving shaft belt pulleys (14) in position, and the second driving shaft belt pulleys (14) and the second driven shaft belt pulleys (15) corresponding to the second driving shaft belt pulleys are linked through belts (6); and
2 second eccentric masses (12) mounted on the second bearing (16) centrally symmetrically along the axle;
wherein the phases of the 2 first eccentric masses (9) are identical, the phases of the 2 second eccentric masses (12) are identical, and the phases of the first eccentric masses (9) and the second eccentric masses (12) arranged at the same end of the axle (11) differ by 180 °.
2. A test device according to claim 1, wherein the test device further comprises an axle (5), the axle (5) having an elongated end.
3. A test device according to claim 1 or 2, wherein the first axle pulley (7) is located inside the bearing housing (3) and the second axle pulley (14) is located outside the bearing housing (3).
4. A test device according to any one of claims 1 to 3, wherein the bearing block (8), the second eccentric mass (12), the second driven shaft pulley (15), the first eccentric mass (9) and the first driven shaft pulley (10) are arranged in succession along the two ends of the axle (5) towards the centre thereof.
5. A test device according to any one of claims 1 to 4, wherein the second axle shaft pulley (14), the bearing housing (3) and the first axle shaft pulley (7) are arranged in sequence from the ends of the axle shaft (5) towards its centre.
6. A test device according to any one of claims 1 to 5, wherein the drive shaft (5) is a stepped shaft with symmetrical ends.
7. A test method of an axle fatigue test performed on the test apparatus of any one of claims 1 to 6, wherein the test method comprises the steps of:
(1) mounting 2 first driven shaft pulleys (10) and 2 first eccentric masses (9) via first bearings (13) to a wheel seat region of the axle (11) symmetrically along an axle center, mounting a belt, wherein the phases of the 2 first eccentric masses (9) are the same;
(2) -mounting 2 second driven shaft pulleys (15) and 2 second eccentric masses (12) via second bearings (16) to end regions of the axle (11) centrally symmetrically along the axle, mounting a belt, wherein the 2 second eccentric masses (12) are in phase and the first eccentric mass (9) is 180 ° out of phase with a second eccentric mass (12) arranged at the same end of the axle (11);
(3) mounting the axle (11) on the support base (8);
(4) the motor is started (1), the first driven shaft belt pulley (7), the first driven shaft belt pulley (10), the second driven shaft belt pulley (14) and the second driven shaft belt pulley (15) drive the first eccentric mass block (9) and the second eccentric mass block (12) to rotate, and the rotating bending load is applied to the axle (11) by the rotating first eccentric mass block (9) and the rotating second eccentric mass block (12) based on the resonance principle.
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| CN201910604503.2A CN112254940A (en) | 2019-07-05 | 2019-07-05 | Testing device and testing method for axle fatigue test |
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| CN201910604503.2A CN112254940A (en) | 2019-07-05 | 2019-07-05 | Testing device and testing method for axle fatigue test |
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