CN216283390U - Automobile hub bearing working clearance measuring device - Google Patents
Automobile hub bearing working clearance measuring device Download PDFInfo
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- CN216283390U CN216283390U CN202122334980.7U CN202122334980U CN216283390U CN 216283390 U CN216283390 U CN 216283390U CN 202122334980 U CN202122334980 U CN 202122334980U CN 216283390 U CN216283390 U CN 216283390U
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Abstract
The utility model belongs to the field of bearing clearance measurement, and particularly relates to an automobile hub bearing working clearance measuring device, which is used for measuring the hub bearing working clearance, wherein the hub bearing comprises an inner flange, an inner ring and a steel ball; comprising a ballast device on which the hub bearing is located, the ballast device being adapted to apply pressure to the hub bearing; the device is characterized by further comprising at least one strain testing device, wherein the strain testing device is located on one side of the hub bearing and is in contact with the steel ball, and strain data of the strain testing device are measured when the steel ball is displaced. The utility model aims to realize accurate measurement of the negative clearance value of the hub bearing locked by the half shaft and solve the problem that the clearance cannot be measured after the hub bearing is locked by the half shaft.
Description
Technical Field
The utility model belongs to the field of bearing clearance measurement, and particularly relates to a device for measuring the working clearance of an automobile hub bearing.
Background
The clearance of the automobile hub bearing is used as an important control parameter, which not only relates to the rigidity performance of the whole hub bearing unit, but also directly influences the service life of the bearing. For the hub bearing unit of the drive wheel, the working play is determined by the half shaft locking force and the initial play together. Since the working play of the hub bearing is generally negative play, the negative play value of the current hub bearing cannot be directly obtained by measuring the displacement. The initial play value can be generally determined by measuring the displacement before and after the press mounting of the inner ring, but after the hub bearing is locked by the half shaft, the play variation of the hub bearing is a tiny displacement, the measurement is difficult, and no reliable method is available for measurement at present.
SUMMERY OF THE UTILITY MODEL
The utility model provides a device for measuring the working clearance of an automobile hub bearing, aiming at solving the problem that the clearance cannot be measured after the hub bearing is locked by a half shaft, and aiming at realizing the accurate measurement of the negative clearance value of the hub bearing locked by the half shaft.
In order to achieve the purpose, the utility model provides the following technical scheme:
a device for measuring the working clearance of an automobile hub bearing is used for measuring the working clearance of the hub bearing, and the hub bearing comprises an inner flange 8, an inner ring 3 and a steel ball 1; the method is characterized in that:
comprising a ballast device on which the hub bearing is located, the ballast device being adapted to apply pressure to the hub bearing;
the device is characterized by further comprising at least one strain testing device, wherein the strain testing device is located on one side of the hub bearing and is in contact with the steel ball 1, and strain data of the strain testing device are measured when the steel ball 1 is displaced.
Further, the measuring device also comprises a loading block 2 and a cushion block 5, wherein the cushion block 5 is positioned below the inner flange 8 and supports the inner flange 8, and the loading block 2 is pressed on the inner ring 3.
Further, the hub bearing comprises at least one pair of steel balls 1, and the number of the steel balls is the same as that of the strain testing devices; the pair of steel balls 1 are arranged up and down symmetrically and are respectively adhered to the bottom of the raceway of the inner ring 3 and the raceway of the inner flange 8.
Further, the strain testing device comprises an cantilever beam type strain sensor 6 and a dynamic strain tester 4, wherein the cantilever beam type strain sensor 6 comprises two Z-shaped alloy steel plates which are arranged in an up-down symmetrical mode, a supporting block 17 is arranged at one end between the two Z-shaped alloy steel plates, the two Z-shaped alloy steel plates are fixedly connected with the supporting block 17 through fastening screws 15, and a loading point 11 used for being in contact with the steel ball 1 is arranged at the other end of each of the two Z-shaped alloy steel plates; two strain gages are arranged at one end, located on the supporting block 17, of each Z-shaped alloy steel plate, and the two strain gages are symmetrically arranged on the upper surface and the lower surface of the Z-shaped alloy steel plate; the wires of the four strain gauges are interconnected to form an electrical bridge of the full bridge type, which is connected to the dynamic strain gauge 4.
Further, the strain testing device also comprises a magnetic gauge stand 7, and the cantilever beam type strain sensor 6 is arranged on the magnetic gauge stand 7.
Further, the surface of the strain gauge is coated with a silica gel protective layer.
Further, the strain test device is more than two.
The utility model has the beneficial effects that: the strain testing device in the form of the double cantilever beams is manufactured according to the strain testing principle, and can measure the tiny displacement, so that the measuring precision is improved; because the strain testing device adopts a double-cantilever form and can simultaneously measure the relative variation of the steel balls, the method solves the problem that the groove center distance of the hub bearing cannot be measured, and further improves the measuring accuracy.
Drawings
FIG. 1 is a schematic diagram of a device for measuring the working clearance of an automobile hub bearing in an embodiment.
FIG. 2 is a schematic diagram of an embodiment of an cantilever beam strain sensor.
FIG. 3 is a circuit diagram of a full bridge electrical measurement bridge circuit composed of strain gauges in the embodiment.
FIG. 4 is a graph showing the calibration results of the strain gauge in the example.
Fig. 5 is a graph showing the results of the amount of change in the locking force and the play in the example.
In the figure: 1. the steel ball, 2, a loading block, 3, an inner ring, 4, a dynamic strain tester, 5, a cushion block, 6, a cantilever beam type strain sensor, 7, a magnetic gauge stand, 8, an inner flange, 10, a lower Z-shaped alloy steel plate, 11, a loading point, 12, an upper Z-shaped alloy steel plate, 13, a strain gauge II, 14, a strain side piece I, 15, a fastening screw, 16, a four-core connection shielding wire, 17, a support block, 18, a strain gauge IV, 19 and a strain gauge III.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to specific embodiments. It is to be understood that the described embodiments are merely exemplary of the utility model, and not restrictive of the full scope of the utility model. 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.
Taking a hub bearing with the model G3-468, which is produced by Hubei New torch technology Limited, as an example, the bearing has the steel ball spacing of 26.082mm, the pitch circle diameter of 58.5mm, the steel ball diameter of 11.906mm and the raceway curvature radius of 6.16 mm.
As shown in fig. 1, 2 and 3, the device for measuring the working clearance of the automobile hub bearing is used for measuring the working clearance of the hub bearing, a sample is used for measurement to replace the working clearance, an inner flange 8, an inner ring 3 and 4 steel balls 1 of the hub bearing are selected, the inner ring 3 is pressed on the inner flange 8, then the 2 steel balls are respectively adhered to an inner ring raceway and an inner flange raceway through an adhesive, the adhering positions are at the bottoms of the raceway grooves, the two steel balls are vertically symmetrical, and then the 2 steel balls are adhered to the symmetrical positions in the same way.
Comprises a ballast device, and a common universal experiment machine is selected in the embodiment.
The sample piece is matched with a universal testing machine through a loading block 2 and a cushion block 5, the cushion block 5 is positioned below the inner flange 8 and supports the inner flange 8, and the loading block 2 is pressed on the inner ring 3 and is integrally arranged on the universal testing machine.
The device also comprises two strain testing devices which are symmetrically arranged on two sides of the sample piece.
The strain testing device comprises an cantilever type strain sensor 6, a dynamic strain tester 4 and a magnetic meter frame 7.
As shown in fig. 2, the cantilever-beam-type strain sensor 6 includes two Z-shaped alloy steel plates: the lower Z-shaped alloy steel plate 10 and the upper Z-shaped alloy steel plate 12 are made of alloy steel materials, and are 12mm in width and 2.5mm in thickness.
The two Z-shaped alloy steel plates are arranged in an up-and-down symmetrical mode, one end between the two Z-shaped alloy steel plates is provided with a supporting block 17, the two Z-shaped alloy steel plates are fixedly connected with the supporting block 17 through fastening screws 15 to form an up-and-down symmetrical cantilever beam mode, and the other ends of the two Z-shaped alloy steel plates are provided with loading points 11 used for being in contact with the steel ball 1. One end, located at the supporting block 17, of each Z-shaped alloy steel plate is provided with two strain gauges which are symmetrically arranged on the upper surface and the lower surface of the Z-shaped alloy steel plate, and silica gel is uniformly coated on the strain gauges and used for protecting the strain gauges. The wires of the four strain gauges (first strain gauge 14, second strain gauge 13, third strain gauge 19 and fourth strain gauge 18 in the figure) are connected to each other to form an electrical bridge of a full bridge type, which is connected to the dynamic strain tester 4, as shown in fig. 3. The cantilever beam strain sensor 6 is located on a magnetic gauge support 7.
The method for measuring the working clearance of the automobile hub bearing comprises the following steps:
s100: manufacturing a test sample, selecting an inner flange 8, an inner ring 3 and four steel balls 1 of a hub bearing, pressing the inner ring 3 on the inner flange 8, and then bonding the steel balls 1 to the raceway bottom of the inner ring 3 and the raceway bottom of the inner flange 8 through a bonding agent.
S200: the automobile hub bearing working clearance measuring device is calibrated through ballast equipment (a universal tester), a loading head of the universal tester presses down a loading point of a Z-shaped alloy steel plate, a calibration displacement range is set to be from 0 to 100 mu m, data are recorded once at intervals of 2 mu m, the recorded data comprise pressed-down displacement and strain quantity output by a dynamic strain tester, a strain quantity and displacement relation line graph is drawn according to the pressed-down displacement and the strain quantity output by the dynamic strain tester, and a linear regression formula of the strain quantity epsilon and a calibration displacement d is obtained through linear regression analysis: d ═ a × epsilon + b (where a, b are determined from the specific data).
As shown in FIG. 4, according to the hub bearing of G3-468, the linear regression formula is: d 0.1023 ∈ + 0.1174.
S300: a cushion block 5 is placed at the bottom of the sample piece, a loading block 2 is placed at the top of the sample piece, and then the sample piece is integrally placed on a workbench of a universal testing machine; the strain testing device is symmetrically arranged on the left side and the right side of the sample piece and fixed on the workbench through the magnetic meter frame 7, and the loading points 11 of the upper Z-shaped alloy steel plate and the lower Z-shaped alloy steel plate are respectively contacted with the upper steel ball 1 and the lower steel ball 1 of the sample piece and keep a certain prepressing amount.
S400: the loading head of the universal tester applies pressure to the loading block 2, the pressure loading range is 0-100 KN, the loading speed is 500N/s, 10KN pressure maintaining time is 10s every interval, and strain values epsilon generated by two current strain type sensors are recorded1And ε2。
S500: calculating strain values epsilon under different loads through linear regression relationship1And ε2Corresponding displacement amounts, respectively d1And d2Taking the average of the two displacement amounts: delta deltaFa＝0.5*(d1+d2) This value is the amount of change in bearing play for different locking forces, as shown in fig. 5. Fitting the obtained data through regression analysis to obtain locking force Fa and play variation deltaFaThe quadratic fit relation of (1): fa＝-0.0025*ΔδFa 2+1.1062*ΔδFa-6.7547。
S600: when the initial clearance of the hub bearing before the half shaft is locked is delta0When the half axle locking force Fa is measured to be 78.2KN under the condition of 24.8 mu m, the clearance change delta corresponding to the locking force Fa is calculated according to the fitting relationFa64.5 μm; at the moment, the current working clearance of the hub bearing after being locked by the half shaft is obtained by calculation as follows: delta-delta0-ΔδFa＝-39.7μm。
The strain gauge model used in the embodiment is medium-sized avionics TK120-3AA (11) 1.9-G100.
The dynamic strain tester used in this example was the austria dewsofjsirius strain tester.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A device for measuring the working clearance of an automobile hub bearing is used for measuring the working clearance of the hub bearing, and the hub bearing comprises an inner flange (8), an inner ring (3) and a steel ball (1); the method is characterized in that:
comprising a ballast device on which the hub bearing is located, the ballast device being adapted to apply pressure to the hub bearing;
the device is characterized by further comprising at least one strain test device, wherein the strain test device is located on one side of the hub bearing and is in contact with the steel ball (1), and strain data of the strain test device are measured when the steel ball (1) is displaced.
2. The automobile hub bearing working play measuring device according to claim 1, characterized in that: the measuring device further comprises a loading block (2) and a cushion block (5), wherein the cushion block (5) is positioned below the inner flange (8) and supports the inner flange (8), and the loading block (2) is pressed on the inner ring (3).
3. The automobile hub bearing working play measuring device according to claim 1, characterized in that: the hub bearing comprises at least one pair of steel balls (1), and the number of the steel balls is the same as that of the strain test devices; the pair of steel balls (1) are arranged up and down symmetrically and are respectively adhered to the bottom of the raceway groove of the inner ring (3) raceway and the raceway of the inner flange (8).
4. The automobile hub bearing working play measuring device according to claim 3, characterized in that: the strain testing device comprises an cantilever beam type strain sensor (6) and a dynamic strain tester (4), wherein the cantilever beam type strain sensor (6) comprises two Z-shaped alloy steel plates which are arranged in an up-down symmetrical mode, a supporting block (17) is arranged at one end between the two Z-shaped alloy steel plates, the two Z-shaped alloy steel plates are fixedly connected with the supporting block (17) through fastening screws (15), and loading points (11) used for being in contact with the steel balls (1) are arranged at the other ends of the two Z-shaped alloy steel plates; one end of each Z-shaped alloy steel plate, which is positioned on the supporting block (17), is provided with two strain gauges, and the two strain gauges are symmetrically arranged on the upper surface and the lower surface of the Z-shaped alloy steel plate; the wires of the four strain gauges are connected with each other to form an electrical bridge circuit of a full bridge type, and the electrical bridge circuit is connected to a dynamic strain tester (4).
5. The automobile hub bearing working play measuring device according to claim 4, characterized in that: the strain testing device further comprises a magnetic gauge stand (7), and the cantilever beam type strain sensor (6) is arranged on the magnetic gauge stand (7).
6. The automobile hub bearing working play measuring device according to claim 4, characterized in that: and the surface of the strain gauge is coated with a silica gel protective layer.
7. The automobile hub bearing working play measuring device according to claim 4, characterized in that: the strain test device is more than two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122334980.7U CN216283390U (en) | 2021-09-26 | 2021-09-26 | Automobile hub bearing working clearance measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122334980.7U CN216283390U (en) | 2021-09-26 | 2021-09-26 | Automobile hub bearing working clearance measuring device |
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| Publication Number | Publication Date |
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| CN216283390U true CN216283390U (en) | 2022-04-12 |
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| CN202122334980.7U Active CN216283390U (en) | 2021-09-26 | 2021-09-26 | Automobile hub bearing working clearance measuring device |
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| CN (1) | CN216283390U (en) |
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- 2021-09-26 CN CN202122334980.7U patent/CN216283390U/en active Active
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