CN115979641A - HUB bearing HUB bending fatigue testing machine for automobile HUB and testing method - Google Patents
HUB bearing HUB bending fatigue testing machine for automobile HUB and testing method Download PDFInfo
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- CN115979641A CN115979641A CN202211647728.4A CN202211647728A CN115979641A CN 115979641 A CN115979641 A CN 115979641A CN 202211647728 A CN202211647728 A CN 202211647728A CN 115979641 A CN115979641 A CN 115979641A
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Abstract
The invention discloses an automobile HUB bearing HUB bending fatigue testing machine and a testing method, and relates to the field of HUB bearings. And after the hub bearing sample is installed as required, starting a hydraulic pump station and a control system. During testing, the radial and axial actuating cylinders apply sine wave force with certain frequency (displacement control can also be performed), and the distance from a radial force loading point and an axial force loading point to the hub bearing is consistent with the radius and the offset distance of a wheel in a real vehicle. The two forces meet the requirement of ceaseless pulling and pressing of the hub bearing, so that a hub bearing sample is deformed, cracks are generated and damaged, and the purpose of testing is achieved. The radial load center, the axial load center and the center of the hub bearing sample are coplanar, and interference cannot occur during combined loading.
Description
Technical Field
The invention relates to the field of HUB bearings, in particular to a HUB bearing HUB bending fatigue testing machine and a testing method thereof.
Background
The fatigue life test structure of the bearing can reveal the quality levels of the bearing structure, such as design, manufacturing process, material quality, lubrication and the like, and is an important index for comprehensively evaluating the quality of the bearing product. Therefore, before the automobile hub bearing is delivered from a factory, a bending fatigue test is carried out on the automobile hub bearing to form an important index.
Chinese patent document (CN 208366606U) discloses a bending fatigue test device for an automobile hub bearing, which comprises a supporting mechanism for supporting a test bearing; the supporting mechanism is provided with a bearing lower seat and a bearing upper seat; the test bearing is positioned between the lower bearing seat and the upper bearing seat and fixedly connected with the lower bearing seat and the upper bearing seat; the lower bearing seat is fixed on the upper end surface of the lathe bed; the lathe bed is fixed on the lower bottom plate; the upper part of the bearing upper seat is connected with one end of the loading plate I; the other end of the loading plate I is connected with an axial loading mechanism; the upper end of the loading plate I is fixedly connected with a loading plate II; one end of the loading plate II is bent downwards to form an L-shaped plate; one end of the loading plate II bent downwards is connected with the radial loading mechanism; the radial loading mechanism is fixed on the upper end surface of the lathe bed, and the axial loading mechanism is fixed on the lower bottom plate. When the automobile hub bearing is subjected to bending fatigue test in the prior art taking the structure as an example, due to the structural limitation of the test bearing supporting mechanism, the phenomenon of mutual interference between axial loading and radial loading is easy to generate during the test, so that the test load distortion is caused, and the reliability of data is influenced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a HUB bearing HUB bending fatigue testing machine and a testing method for an automobile HUB bearing, which truly simulate the stress condition of the HUB bearing in the actual motion of an automobile, realize the combined loading of radial force and axial force and test the fatigue strength of the HUB bearing; the center of the axial force acting cylinder, the center of the radial force acting cylinder and the center of the hub bearing sample are coplanar, interference cannot occur during combined loading, and the accuracy of a test result is improved.
The purpose of the invention is achieved by the following technical scheme: the HUB bearing HUB bending fatigue testing machine comprises a bottom plate, a HUB bearing test sample, a hydraulic pump station and a control system, wherein a first upright post and a second upright post are arranged on the bottom plate along the vertical direction, a radial force acting cylinder is fixedly arranged on the first upright post, a flange on one side of the HUB bearing test sample is fixed on the second upright post through a bearing mounting base, a flange on the other side of the HUB bearing test sample is fixed on an axial force loading arm, the axial force acting cylinder is arranged on the bottom plate along the vertical direction, a loading end of the axial force acting cylinder is connected with the axial force loading arm for loading, axial force is applied to the HUB bearing test sample, the radial force loading arm is arranged on one side, facing the radial force acting cylinder, of the axial force loading arm, and the loading end of the radial force acting cylinder is connected with the radial force loading arm for loading, so that radial force is applied to the HUB bearing test sample; the center of the axial force actuating cylinder, the center of the radial force actuating cylinder and the center of the hub bearing sample are coplanar; the axial force actuating cylinder and the radial force actuating cylinder are controlled by the hydraulic pump station and the control system to work.
As a further technical scheme, an axial force sensor and an axial displacement sensor are arranged on the axial force actuating cylinder and used for detecting the axial load and the axial displacement of the hub bearing sample and feeding back the axial load and the axial displacement to the hydraulic pump station and the control system; and the radial force actuating cylinder is provided with a radial force sensor and a radial displacement sensor, and is used for detecting the radial load and the radial displacement of the hub bearing sample and feeding back the radial load and the radial displacement to the hydraulic pump station and the control system.
As a further technical scheme, the axial force acting cylinder is fixedly connected with the second upright post through an axial force acting cylinder fixing support.
A test method adopting the HUB bearing HUB bending fatigue testing machine for the automobile HUB comprises the following steps:
the first step is as follows: after the first upright post and the second upright post are adjusted to proper positions, the first upright post and the second upright post are fixed on the bottom plate; fixing a flange on one side of a hub bearing sample on a second upright post through a bearing mounting base, fixing a flange on the other side of the hub bearing sample with an axial force loading arm, mounting an axial force acting cylinder on a bottom plate along the vertical direction and connecting the axial force acting cylinder to the axial force loading arm, mounting a radial force loading arm on one side of the axial force loading arm, which faces to the radial force acting cylinder, and connecting the radial force acting cylinder to the radial force loading arm;
the second step: starting a hydraulic pump station and a control system, setting test program parameters, starting a test, and recording test time, real-time load and deformation displacement data in the test process;
the third step: and after the test is carried out for the set times, stopping the test, detaching the HUB bearing sample, and detecting a flaw to check whether the HUB bearing sample HUB flange has the crack.
As a further technical scheme, in the first step, the proper position is a coplanar position of the center of the axial force acting cylinder, the center of the radial force acting cylinder and the center of the hub bearing sample, meanwhile, the length of a loading force arm of the axial force output by the axial force acting cylinder is adjusted to be consistent with the radius of a wheel in a real vehicle, and the loading distance of the radial force output by the radial force acting cylinder is consistent with the offset distance of the wheel in the real vehicle; and the axial force actuating cylinder is connected to the second upright post through the axial force actuating cylinder fixing support.
As a further technical scheme, in the second step, the set test program parameters comprise a radial load Fr and an axial load, wherein the radial load Fr is constant, fr = g/2 Me, me is the maximum weight borne by the front/rear axle of the automobile; the axial load is output in a sine wave form, the frequency is 5Hz, the axial load comprises an inward axial load Fin and an outward axial load Fout, and the loading coefficient is obtained according to the actual road spectrum measurement and experience.
As a further technical scheme, in the third step, the set number of times is more than or equal to 25 ten thousand, and if the number of failed parts is more than 4 in the same batch of inspection, the reliability of the bending fatigue life of the bearing needs to be evaluated.
The invention has the beneficial effects that:
1. the radial load and the axial load are loaded through the radial force loading arm and the axial force loading arm, and the center of the radial load, the center of the axial load and the center of the hub bearing sample are coplanar, so that interference cannot occur during combined loading, and the accuracy of a test result is improved;
2. a road spectrum obtained by the real vehicle is used for carrying out simulation test, the real vehicle working condition of the hub bearing sample can be reproduced, and the test result is more reliable.
Drawings
Fig. 1 is a schematic perspective view of the present invention.
Fig. 2 is a schematic top view of the present invention.
Fig. 3 isbase:Sub>A sectional viewbase:Sub>A-base:Sub>A of fig. 2.
Fig. 4 is a partially enlarged view of the region B in fig. 3.
FIG. 5 is a graph of axial load magnitude as a function of time in the present invention.
Description of the reference numerals: the device comprises a bottom plate 1, a first upright post 2, a second upright post 3, an axial force acting cylinder 4, an axial force sensor 4-1, an axial displacement sensor 4-2, a radial force acting cylinder 5, a radial force sensor 5-1, a radial displacement sensor 5-2, a hub bearing sample 6, a bearing mounting base 7, an axial force loading arm 8, a radial force loading arm 9, an axial force acting cylinder fixing support 10, a hydraulic pump station and a control system 11.
Detailed Description
The invention will be described in detail below with reference to the following drawings:
example (b): as shown in attached figures 1-4, the automobile HUB bearing HUB bending fatigue testing machine comprises a bottom plate 1, a first upright post 2, a second upright post 3, an axial force acting cylinder 4, an axial force sensor 4-1, an axial displacement sensor 4-2, a radial force acting cylinder 5, a radial force sensor 5-1, a radial displacement sensor 5-2, a HUB bearing sample 6, a bearing mounting base 7, an axial force loading arm 8, a radial force loading arm 9, an axial force acting cylinder fixing support 10 and a hydraulic pump station and control system 11.
Referring to the attached drawing 1, a first upright column 2 and a second upright column 3 are arranged on a bottom plate 1 along the vertical direction, the top of the first upright column 2 is used for mounting a radial force acting cylinder 5, a flange (outer ring flange) on one side of a hub bearing sample 6 is fixed on the second upright column 3 through a bearing mounting base 7, and a flange (inner ring flange) on the other side of the hub bearing sample 6 is fixed on the lower surface of an axial force loading arm 8. The axial force acting cylinder 4 is fixedly installed on the bottom plate 1 along the vertical direction, and the loading end of the axial force acting cylinder 4 is connected with the lower surface of the axial force loading arm 8 for loading, so that the axial force can be applied to the hub bearing test sample 6. The radial force loading arm 9 is fixedly installed on the right side (the side facing the radial force acting cylinder 5) of the axial force loading arm 8, and the loading end of the radial force acting cylinder 5 is connected with the radial force loading arm 9 for loading, so that the radial force can be applied to the hub bearing test sample 6. As shown in fig. 3, the center of the axial force acting cylinder 4, the center of the radial force acting cylinder 5 and the center of the hub bearing sample 6 are coplanar, so that interference does not occur during axial and radial combined loading, and the accuracy of the test result is improved. The axial force actuating cylinder 4 and the radial force actuating cylinder 5 are controlled by a hydraulic pump station and a control system 11 to work (including hydraulic control and electric control).
Further, an axial force sensor 4-1 and an axial displacement sensor 4-2 are arranged on the axial force actuating cylinder 4 and used for detecting the axial load and the axial displacement of the hub bearing sample 6 and feeding back signals to the hydraulic pump station and the control system 11 through electrical connection; and the radial force actuating cylinder 5 is provided with a radial force sensor 5-1 and a radial displacement sensor 5-2, and is used for detecting the radial load and the radial displacement of the hub bearing test sample 6 and feeding back signals to the hydraulic pump station and the control system 11 through electrical connection.
Preferably, the axial force actuating cylinder 4 is fixedly connected with the second upright post 3 through the axial force actuating cylinder fixing support 10, so that the axial force actuating cylinder 4 is prevented from swinging left and right during working, and the test accuracy is improved.
A test method adopting the HUB bearing HUB bending fatigue testing machine for the automobile HUB comprises the following steps:
the first step is as follows: after the first upright post 2 and the second upright post 3 are adjusted to proper positions (the center of the axial force acting cylinder 4, the center of the radial force acting cylinder 5 and the center of the hub bearing test sample 6 are coplanar), the first upright post and the second upright post are fixed on the bottom plate 1; a flange on one side of a hub bearing sample 6 is fixed on a second upright post 3 through a bearing mounting base 7, a flange on the other side of the hub bearing sample 6 is fixed with an axial force loading arm 8, an axial force actuating cylinder 4 is mounted on a bottom plate 1 along the vertical direction and is connected to the axial force loading arm 8, the length of a loading force arm of an axial force output by the axial force actuating cylinder 4 is adjusted to be consistent with the radius of a wheel in a real vehicle, the loading distance of a radial force output by a radial force actuating cylinder 5 is consistent with the offset distance of the wheel in the real vehicle, and the consistency of a test and the working condition of the real vehicle is ensured. On the side of the axial force loading arm 8 facing the radial force cylinder 5, a radial force loading arm 9 is mounted, connecting the radial force cylinder 5 to the radial force loading arm 9. Finally, the axial force cylinder 4 is connected to the second upright 3 via an axial force cylinder fixing bracket 10.
The second step: starting the hydraulic pump station and the control system 11, setting test program parameters and starting a test, wherein the set test program parameters comprise a radial load Fr and an axial load, the radial load Fr is constant, the calculation formula is Fr = g/2 Me, and Me is the maximum weight borne by a front shaft and a rear shaft of the automobile; the axial load is output in the form of a sine wave with a frequency of 5Hz, the magnitude of the axial load is shown in fig. 5 with a time-dependent curve, the axial load comprises an inward axial load Fin and an outward axial load Fout, fin =0.88 × Li, li is the maximum inward axial load (corresponding to the peak position in the curve of fig. 5), and Li =6.54 × me; fout =0.88 Lo, lo is the maximum outward axial load (corresponding to the valley position in the graph of fig. 5), and Lo = (0.003d + 0.695) Li, D is the weighted offset of the hub bearing test piece. The coefficients in the formula, namely the loading coefficients, are obtained according to actual vehicle road spectrum measurement and experience, when the automobile runs, the strain gauge sensor is attached to the surface of the hub unit to acquire actual vehicle road condition load data to form a road spectrum, and then the road spectrum is subjected to iterative conversion and expert experience to obtain the corresponding loading coefficients. And in the whole test process, recording test time, real-time load and deformation displacement data.
The third step: after the test was performed for a set number of times (at least 25 ten thousand times), the test was stopped, the HUB bearing sample 6 was removed, and the HUB bearing sample HUB flange was inspected for cracks by flaw detection. If the number of the failed parts is more than 4 in the same batch of inspection, the reliability of the bending fatigue life of the bearing needs to be evaluated.
The HUB bearing test sample is installed according to the actual automobile state of the automobile, radial force and axial force with certain frequency are applied to the HUB bearing, after a certain test time is finished, whether the HUB flange of the HUB bearing has cracks or not is checked, and the rigidity fatigue strength of the HUB bearing is checked. And after the hub bearing sample is installed as required, starting a hydraulic pump station and a control system. During testing, the radial force and the axial force are applied to the two actuating cylinders to apply sine wave force with a certain frequency (displacement control can also be performed), and the distance between a radial force loading point and an axial force loading point to the hub bearing is consistent with the radius and the offset distance of a wheel mounted on a real vehicle. The two forces meet the requirement of ceaseless pulling and pressing of the hub bearing, so that a hub bearing sample is deformed, cracks are generated and damaged, and the purpose of testing is achieved.
The testing machine and the testing method provided by the invention can be used for testing the HUB flange bending fatigue of the HUB bearing of the automobile HUB and checking the rigidity fatigue crack strength of the HUB bearing. The automobile hub bearing test system is suitable for research and development tests of automobile hub bearing production enterprises, acceptance tests of automobile host factories and the like.
It should be understood that the technical solutions and the inventive concepts of the present invention should be replaced or changed by equivalents and modifications to the technical solutions and the inventive concepts of the present invention by those skilled in the art.
Claims (7)
1. The utility model provides an automobile wheel HUB bearing HUB bending fatigue testing machine which characterized in that: the test device comprises a base plate (1), a hub bearing test sample (6), a hydraulic pump station and a control system (11), wherein a first upright post (2) and a second upright post (3) are arranged on the base plate (1) along the vertical direction, a radial force acting cylinder (5) is fixedly arranged on the first upright post (2), a flange at one side of the hub bearing test sample (6) is fixed on the second upright post (3) through a bearing mounting base (7), a flange at the other side of the hub bearing test sample (6) is fixed on an axial force loading arm (8), the axial force acting cylinder (4) is arranged on the base plate (1) along the vertical direction, a loading end of the axial force acting cylinder (4) is connected with the axial force loading arm (8) for loading, axial force is applied to the hub bearing test sample (6), the axial force loading arm (8) is provided with a radial force loading arm (9) towards one side of the radial force acting cylinder (5), and a loading end of the radial force acting cylinder (5) is connected with the radial force loading arm (9) for loading and applies a radial force test sample to the hub bearing (6); the center of the axial force actuating cylinder (4), the center of the radial force actuating cylinder (5) and the center of the hub bearing sample (6) are coplanar; the axial force actuating cylinder (4) and the radial force actuating cylinder (5) are controlled by a hydraulic pump station and a control system (11) to work.
2. The automobile HUB bearing HUB bending fatigue testing machine of claim 1, characterized in that: the axial force actuating cylinder (4) is provided with an axial force sensor (4-1) and an axial displacement sensor (4-2) and is used for detecting the axial load and the axial displacement of the hub bearing sample (6) and feeding back the axial load and the axial displacement to the hydraulic pump station and the control system (11); and the radial force actuating cylinder (5) is provided with a radial force sensor (5-1) and a radial displacement sensor (5-2) and is used for detecting the radial load and the radial displacement of the hub bearing test sample (6) and feeding back the radial load and the radial displacement to the hydraulic pump station and the control system (11).
3. The automobile HUB bearing HUB bending fatigue testing machine according to claim 2, characterized in that: the axial force actuating cylinder (4) is fixedly connected with the second upright post (3) through an axial force actuating cylinder fixing support (10).
4. The test method of the automobile HUB bearing HUB bending fatigue tester according to any one of claims 1 to 3 is characterized in that: the method comprises the following steps:
the first step is as follows: after the first upright post (2) and the second upright post (3) are adjusted to proper positions, the first upright post and the second upright post are fixed on the bottom plate (1); fixing a flange on one side of a hub bearing test sample (6) on a second upright post (3) through a bearing mounting base (7), fixing a flange on the other side of the hub bearing test sample (6) with an axial force loading arm (8), mounting an axial force acting cylinder (4) on a base plate (1) along the vertical direction and connecting the axial force loading arm to the axial force loading arm (8), mounting a radial force loading arm (9) on one side, facing the radial force acting cylinder (5), of the axial force loading arm (8), and connecting the radial force acting cylinder (5) to the radial force loading arm (9);
the second step is that: starting a hydraulic pump station and a control system (11), setting test program parameters, starting a test, and recording test time, real-time load and deformation displacement data in the test process;
the third step: and after the test is carried out for the set times, stopping the test, detaching the HUB bearing sample (6), and detecting a flaw to check whether the HUB bearing sample HUB flange has the crack.
5. The test method according to claim 4, characterized in that: in the first step, the proper position is the coplanar position of the center of the axial force acting cylinder (4), the center of the radial force acting cylinder (5) and the center of the hub bearing test sample (6), meanwhile, the length of a loading force arm of the axial force output by the axial force acting cylinder (4) is adjusted to be consistent with the radius of a wheel in a real vehicle, and the loading distance of the radial force output by the radial force acting cylinder (5) is consistent with the offset distance of the wheel in the real vehicle; the axial force actuating cylinder (4) is connected to the second upright post (3) through an axial force actuating cylinder fixing support (10).
6. The test method according to claim 5, characterized in that: in the second step, the set test program parameters comprise a radial load Fr, an axial load and a loading coefficient, wherein the radial load Fr is constant, fr = g/2 Me, and Me is the maximum weight borne by the front/rear axle of the automobile; the axial load is output in a sine wave form, the frequency is 5Hz, the axial load comprises an inward axial load Fin and an outward axial load Fout, and the loading coefficient is obtained according to the actual road spectrum measurement and experience.
7. The test method according to claim 6, characterized in that: and in the third step, the set times are more than or equal to 25 ten thousand, and if the number of failed parts is more than 4 in the same batch of inspection, the reliability of the bending fatigue life of the bearing needs to be evaluated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211647728.4A CN115979641A (en) | 2022-12-21 | 2022-12-21 | HUB bearing HUB bending fatigue testing machine for automobile HUB and testing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211647728.4A CN115979641A (en) | 2022-12-21 | 2022-12-21 | HUB bearing HUB bending fatigue testing machine for automobile HUB and testing method |
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| CN115979641A true CN115979641A (en) | 2023-04-18 |
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| CN202211647728.4A Pending CN115979641A (en) | 2022-12-21 | 2022-12-21 | HUB bearing HUB bending fatigue testing machine for automobile HUB and testing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116839907A (en) * | 2023-09-04 | 2023-10-03 | 万向钱潮股份公司 | Hub bearing axial rigidity test method and test device |
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- 2022-12-21 CN CN202211647728.4A patent/CN115979641A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116839907A (en) * | 2023-09-04 | 2023-10-03 | 万向钱潮股份公司 | Hub bearing axial rigidity test method and test device |
| CN116839907B (en) * | 2023-09-04 | 2023-11-21 | 万向钱潮股份公司 | Hub bearing axial rigidity test method and test device |
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