CN111829477A - Calculation method, device, storage medium and equipment for wheel hub bearing negative clearance - Google Patents

Abstract

The present invention provides a method, device, storage medium and device for calculating the negative clearance of a wheel hub bearing, comprising the following steps: obtaining the inner flange of the wheel hub bearing to be tested when an external force F is applied, the wheel hub to be tested Displacement parameters of the inner ring of the bearing; obtain the displacement parameters of the inner ring of the hub bearing with zero initial clearance when the external force F is applied to the inner flange of the hub bearing with zero initial clearance; according to F, A _c1 , and A _c02 , calculate the negative clearance value δ of the wheel hub bearing to be tested. The invention calculates the negative clearance value according to the relationship between the applied external force, the displacement of the inner ring of the hub bearing to be tested, and the displacement of the inner ring of the hub bearing with zero initial clearance, which can be used in the factory of the hub bearing to be tested. The detection of the negative clearance value is carried out before the detection, and the detection results are reproducible and high in accuracy.

Description

Calculation method, device, storage medium and equipment for wheel hub bearing negative clearance

technical field

The invention relates to the technical field of bearing negative clearance, in particular to a calculation method, device, storage medium and equipment for wheel hub bearing negative clearance.

Background technique

Negative clearance parameters are one of the key factors that determine the performance of the wheel hub bearing unit. The rationality of its design and processing will directly affect the working life of the wheel hub bearing unit and the driving safety of the vehicle. Therefore, it is necessary to carry out negative clearance on the finished product of the wheel hub bearing unit. Clearance detection, and use the detection result as one of the indicators for judging whether the hub bearing is qualified or not. The existing negative clearance detection of the finished wheel hub bearing unit does not have the repeated detection of the same product, and cannot achieve the reproducibility of the detection, and the detection is a pre-riveting detection, which cannot reflect the actual situation of the negative clearance of the finished wheel hub bearing.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to propose a method for calculating the negative clearance of a wheel hub bearing, which aims to solve the technical problem that real-time online and repeatable detection of the wheel hub bearing cannot be performed.

In order to achieve the above purpose, the present invention proposes a method for calculating the negative clearance of a wheel hub bearing, which includes the following steps:

Obtain the displacement parameter A _c1 of the inner ring of the hub bearing to be tested when the inner flange of the hub bearing to be tested is applied with an external force F;

Obtain the displacement parameter A _c02 of the inner ring of the hub bearing with zero initial clearance when the external force F is applied to the inner flange of the hub bearing with zero initial clearance;

According to F, A _c1 , and A _c02 , the negative clearance value δ of the hub bearing to be tested is calculated.

Optionally, the negative clearance value δ of the hub bearing to be tested is:

In the formula, ∑ρ is the curvature function of the steel ball contact, E is the comprehensive parameter of Poisson's ratio and elastic modulus of the bearing material, α is the steel ball contact angle, δ ^* is the point contact ellipse integral parameter, and n is the number of steel balls.

In addition, in order to achieve the above object, the present invention also provides a control device for the negative clearance of a wheel hub bearing, which includes a memory, a processor, and a negative clearance of the wheel hub bearing stored in the memory and running on the processor. The measurement program of the calculation method of the wheel hub bearing negative clearance is configured to realize the steps of the calculation method of the wheel hub bearing negative clearance according to any one of claims 1 to 2.

In addition, in order to achieve the above object, the present invention also proposes a storage medium, the storage medium stores a measurement program of the calculation method of the negative clearance of the wheel hub bearing, and the storage medium stores the calculation method of the negative clearance of the wheel hub bearing The steps of implementing the method for calculating the negative clearance of a wheel hub bearing as claimed in any one of claims 1 to 2 when the measurement program of the is executed by the processor.

In addition, in order to achieve the above purpose, the present invention also proposes a detection device for the negative clearance of the wheel hub bearing, including:

Detection equipment main body;

a loading device, fixed on the main body of the detection device, for applying external force to the inner flange of the hub bearing to be tested and the inner flange of the hub bearing with zero initial clearance;

a positioning device for detecting the displacement of the inner ring of the hub bearing to be measured and the displacement of the inner ring of the hub bearing with zero initial clearance; and,

The control device for the negative clearance of the wheel hub bearing is fixedly arranged on the main body of the detection equipment, and is electrically connected with the main body of the detection equipment, the loading device, and the positioning device. The control device for the negative clearance of the wheel hub bearing A control device for the negative clearance of a wheel hub bearing as claimed in claim 3 .

Optionally, the positioning device includes a displacement sensor, and the displacement sensor is used to detect the displacement of the inner ring of the hub bearing to be measured and the displacement of the inner ring of the hub bearing with zero initial clearance. quantity.

Optionally, the loading device is an electric cylinder or a hydraulic cylinder.

In the technical solution of the present invention, starting from the Hertzian contact theory, based on the specific structural parameters of the hub bearing product, according to the applied external force, the displacement of the inner ring of the hub bearing to be measured, and the inner ring of the hub bearing with zero initial clearance The relationship between the displacements can calculate the negative clearance value, and the negative clearance value can be detected before the hub bearing to be tested leaves the factory, and the detection results are reproducible and high in accuracy.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained according to the structures shown in these drawings without creative efforts.

1 is a schematic structural diagram of an embodiment of a wheel hub bearing to be tested provided by the present invention;

2 is a schematic structural diagram of an embodiment of a wheel hub bearing with zero initial clearance provided by the present invention;

3 is a schematic flowchart of an embodiment of a method for calculating the negative clearance of a wheel hub bearing provided by the present invention;

4 is a schematic structural diagram of an embodiment of a detection device for wheel hub bearing negative clearance provided by the present invention;

FIG. 5 is a schematic structural diagram of a control device of the hardware operating environment involved in the solution of the embodiment in FIG. 4 .

Description of reference numbers:

The realization, functional characteristics and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that, if there is a directional indication involved in the embodiment of the present invention, the directional indication is only used to explain the relative positional relationship, motion, etc. between the components under a certain posture. If the specific posture changes , the directional indication changes accordingly.

In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for the purpose of description, and should not be construed as indicating or implying Its relative importance or implicitly indicates the number of technical features indicated. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of such technical solutions does not exist. , is not within the scope of protection required by the present invention.

Negative clearance parameters are one of the key factors that determine the performance of the wheel hub bearing unit. The rationality of its design and processing will directly affect the working life of the wheel hub bearing unit and the driving safety of the vehicle. Therefore, it is necessary to carry out negative clearance on the finished product of the wheel hub bearing unit. Clearance detection, and use the detection result as one of the indicators for judging whether the hub bearing is qualified or not. The existing negative clearance detection of the finished wheel hub bearing unit does not have the repeated detection of the same product, and cannot achieve the reproducibility of the detection, and the detection is a pre-riveting detection, which cannot reflect the actual situation of the negative clearance of the finished wheel hub bearing.

In view of this, the present invention provides a calculation method, device, storage medium and equipment for the negative clearance of a wheel hub bearing, aiming at improving the technical problem of the inability to perform real-time online and repeatable detection of the wheel hub bearing in the prior art.

The invention provides a detection device for the negative clearance of a wheel hub bearing, which includes a detection device main body, a loading device, a positioning device, and a control device for the negative clearance of the wheel hub bearing. The loading device is fixedly arranged on the main body of the testing equipment. When the loading device is applied to the inner flange of the wheel hub bearing 100 to be tested and the inner flange of the wheel hub bearing 200 with zero initial clearance When there is an external force along the axial direction of the hub bearing; the positioning device acting on the inner ring 101 of the hub bearing to be measured and the inner ring 201 of the hub bearing with zero initial clearance detects the hub bearing to be measured The displacement amount of the inner ring 101 and the displacement amount of the hub bearing inner ring 201 with zero initial clearance. The control device for the negative clearance of the wheel hub bearing is fixedly arranged on the main body of the detection equipment, and is electrically connected with the main body of the detection equipment, the loading device, and the positioning device. In the present invention, the value of the external force along the axial direction of the hub bearing applied by the loading device, the displacement of the inner ring 101 of the hub bearing to be measured, and the displacement of the inner ring 201 of the hub bearing with zero initial clearance The negative clearance value is calculated according to the relationship, and the negative clearance value can be detected before the wheel hub bearing 100 to be tested leaves the factory, and the detection result is reproducible and accurate.

Further, referring to FIG. 1 and FIG. 2 , in order to accurately measure the displacement of the inner ring 101 of the hub bearing to be measured and the displacement of the inner ring 201 of the hub bearing with zero initial clearance, the positioning device includes a displacement The displacement sensor is arranged on the inner ring 101 of the hub bearing to be measured and the inner ring 201 of the hub bearing with zero initial clearance, and is electrically connected to the control device for the negative clearance of the hub bearing, and the measured The measured displacement of the inner ring 101 of the hub bearing and the displacement of the inner ring 201 of the hub bearing with zero initial clearance are input into the control device for the negative clearance of the hub bearing. The measurement is real-time and the measurement results are accurate and reliable.

It should be noted that the loading device has various implementations, which may be an electric cylinder or a hydraulic cylinder. In this embodiment, an electric cylinder is used, which can precisely control the thrust, and has low noise, energy saving, cleanliness, high rigidity, strong impact resistance, long service life, and simple operation and maintenance.

The invention provides a control device for the negative clearance of a wheel hub bearing. The control device for the negative clearance of the wheel hub bearing is electrically connected with the main body of the detection equipment, the loading device, and the positioning device, so as to measure the to-be-measured The negative clearance value of the hub bearing 100.

The control device for the negative clearance of the wheel hub bearing may include: a processor 1001 , such as a CPU, a communication bus 1002 , a user interface 1003 , a network interface 1004 , and a memory 1005 . Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface and a wireless interface. Optionally, the network interface 1004 may include a standard wired interface and a wireless interface (eg, a WI-FI interface). The memory 1005 may be high-speed RAM memory, or may be non-volatile memory, such as disk memory. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001 .

Those skilled in the art can understand that the structure of the control device for the negative clearance of the wheel hub bearing shown in FIG. 2 does not constitute a limitation on the control device for the negative clearance of the wheel hub bearing, and may include more or less components than those shown in the drawings. , or a combination of certain components, or a different arrangement of components.

As shown in FIG. 5 , the memory 1005 as a computer storage medium may include an operating system, a network communication module, a user interface module, and a measurement program of a method for calculating the negative clearance of a wheel hub bearing.

In the control device for the negative clearance of the wheel hub bearing shown in FIG. 4, the processor 1001 calls the measurement program of the calculation method for the negative clearance of the wheel hub bearing stored in the memory 1005, and performs the following operations:

Obtain the displacement parameter A _c1 of the inner ring 101 of the hub bearing to be tested when the inner flange of the hub bearing 100 to be tested is applied with an external force F;

Obtain the displacement parameter A _c02 of the inner ring 201 of the hub bearing with zero initial clearance when the external force F is applied to the inner flange of the hub bearing 200 with zero initial clearance;

According to F, A _c1 , and A _c02 , the negative clearance value δ of the hub bearing 100 to be tested is calculated.

Further, the processor 1001 calls the measurement program of the calculation method for the negative clearance of the wheel hub bearing stored in the memory 1005, and also performs the following operations:

The negative clearance value δ of the hub bearing 100 to be tested is:

In the formula, ∑ρ is the curvature function of the steel ball contact, E is the comprehensive parameter of Poisson's ratio and elastic modulus of the bearing material, α is the steel ball contact angle, δ ^* is the point contact ellipse integral parameter, and n is the number of steel balls.

Based on the above hardware structure, the present invention proposes a method for calculating the negative clearance of a wheel hub bearing. The relationship between the displacement parameters of the ring 201 calculates the negative clearance value.

Please refer to FIG. 3 , which is a schematic flowchart of an embodiment of a method for calculating the negative clearance of a wheel hub bearing provided by the present invention.

S10: Obtain the displacement parameter A _c1 of the inner ring 101 of the hub bearing to be tested when the inner flange of the hub bearing 100 to be tested is applied with an external force F;

S20: Obtain the displacement parameter A _c02 of the inner ring 201 of the hub bearing with zero initial clearance when the external force F is applied to the inner flange of the hub bearing 200 with zero initial clearance;

S30: According to F, A _c1 , and A _c02 , calculate and obtain the negative clearance value δ of the hub bearing 100 to be tested.

In this embodiment, starting from the Hertzian contact theory, based on the specific structural parameters of the wheel bearing product, the applied external force, the displacement of the inner ring 101 of the wheel hub bearing to be measured, and the inner ring of the wheel hub bearing with zero initial clearance The relationship between the displacements of 201 is used to calculate the negative clearance value, and the negative clearance value can be detected before the wheel hub bearing 100 to be tested leaves the factory, and the detection results are reproducible and accurate.

In this embodiment, the calculation process of the negative clearance value δ of the hub bearing 100 to be tested is as follows:

The loading device loads the external force on the hub bearing to be measured 100. During the loading process, the deformation of the inner and outer rings, flanges and assembly parts is Ab1, the total displacement measured by the positioning device is Ac1, and the Hertzian deformation Am at the contact point of the bearing steel ball is: Ac1-Ab1. The negative clearance of the hub bearing to be tested is δ, and the deformation of the upper and lower bearings before loading is δ/2. After the external force F is applied, the following bearings are subjected to force F1, and the upper row of bearings is subjected to force F2.

The axial deformations of the upper and lower rows of steel balls of the bearing are:

Am=Am1+Am2

Here, ∑ρ is the curvature function of the steel ball contact, E is the comprehensive parameter of Poisson's ratio and elastic modulus of the bearing material, α is the steel ball contact angle, δ ^* is the point contact ellipse integral parameter, and n is the number of steel balls. These five are determined by the bearing structure parameters, and for a given structure of the hub bearing, the values of these five are constant. Transform equations (1) and (2) into:

When the steel balls in the upper row are not completely loosened, how much the following steel balls are compressed will loosen the steel balls in the upper row. So here is:

A _m1 = A _m2 (5)

Dividing equations (3) and (4) gives:

When the bearing is under load F, there is the following force balance relationship:

Combining formulas (6) and (7), we can get:

Bringing formula (8) into formula (4) and sorting it out, formula (9) can be obtained:

Here, it can be considered that ρ _{inner 2} = ρ _{outer 2} , let its value be ρ, the above formula can be simplified as:

By further transforming formula (10), we can get:

The two items in the square brackets on the left side of formula (11) are respectively Taylor expanded (expanded to the third order), we can get:

Since the bearing is not fully relaxed, so

时，对比公式(12)右边中括号内的两项：when

, compare the two terms in the brackets on the right side of formula (12):

Therefore, the cubic term in the square brackets on the right side of Equation (12) can be rounded off, and then

After finishing, you can get:

Bring Am=Ac1-Ab1 into formula (15) and arrange, we can get:

The loading device loads an external force on the hub bearing 200 with zero initial clearance. During the loading process, the deformation of the inner and outer rings, flanges and assembly parts is Ab02, the total displacement measured by the positioning device is Ac02, and the Hertz at the contact point of the bearing steel ball The deformation amount Am02 is: Ac02-Ab02. Similarly, load F on the hub bearing with zero initial clearance, and its steel balls are deformed as (the hub bearing with zero initial clearance has only the following steel balls):

As in the case of negative clearance, it is considered that ρ _{inner 2} = ρ _{outer 2} , let its value be ρ, and equation (17) can be simplified as:

In the case of the same loading force F, it can be considered that the deformation of other parts (inner and outer rings, flanges and assembly parts) of the hub bearing with zero initial clearance and the hub bearing to be tested (except the steel ball) are equal, namely:

A _b1 = A _b02 (19)

Obtain the formula for calculating negative clearance. Combined with formula (19), formula (20) can be obtained by subtracting formulas (16) and (18):

Arranging the formula (20), the negative clearance value of the bearing can be obtained as:

It should be noted that, in this embodiment, the above calculation process is all stored in the memory 1005, and the processor 1001 calls the measurement program of the calculation method for the negative clearance of the hub bearing stored in the memory 1005 to execute the above calculation process. After the force F, the displacement parameter A _c1 of the inner ring 101 of the hub bearing to be measured, and the displacement parameter A _c02 of the inner ring 201 of the hub bearing with zero initial clearance, the negative travel of the hub bearing to be measured can be directly read gap value.

The above descriptions are only the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Under the conception of the present invention, any equivalent structural transformations made by the contents of the description and drawings of the present invention, or direct/indirect application Other related technical fields are included in the scope of patent protection of the present invention.

Claims (7)

1. a calculation method of wheel hub bearing negative clearance, is characterized in that, comprises the following steps: Obtain the displacement parameter A _c1 of the inner ring of the hub bearing to be tested when the inner flange of the hub bearing to be tested is applied with an external force F; Obtain the displacement parameter A _c02 of the inner ring of the hub bearing with zero initial clearance when the external force F is applied to the inner flange of the hub bearing with zero initial clearance; According to F, A _c1 , and A _c02 , the negative clearance value δ of the hub bearing to be tested is calculated. 2. the calculation method of hub bearing negative clearance as claimed in claim 1, is characterized in that, the negative clearance value δ of described hub bearing to be measured is:

In the formula, ∑ρ is the curvature function of the steel ball contact, E is the comprehensive parameter of Poisson's ratio and elastic modulus of the bearing material, α is the steel ball contact angle, δ ^* is the point contact ellipse integral parameter, and n is the number of steel balls. 3. A control device for wheel hub bearing negative clearance, characterized in that it comprises a memory, a processor, and a measurement of a calculation method for wheel hub bearing negative clearance that is stored on the memory and can run on the processor The program, the measurement program of the method for calculating the negative clearance of the wheel hub bearing is configured to implement the steps of the method for calculating the negative clearance of the wheel hub bearing according to any one of claims 1 to 2 . 4. A storage medium, characterized in that a measurement program of a calculation method for the negative clearance of a wheel hub bearing is stored on the storage medium, and a measurement program of a calculation method for the negative clearance of the wheel hub bearing is stored on the storage medium Steps for implementing the method for calculating the negative clearance of a wheel hub bearing as claimed in any one of claims 1 to 2 when executed by a processor. 5. A detection device for wheel hub bearing negative clearance, characterized in that it comprises: Detection equipment main body; a loading device, which is fixed on the main body of the detection equipment and is used to apply external force to the inner flange of the wheel hub bearing to be tested and the inner flange of the wheel hub bearing with zero initial clearance; a positioning device for detecting the displacement of the inner ring of the hub bearing to be measured and the displacement of the inner ring of the hub bearing with zero initial clearance; and, The control device for the negative clearance of the wheel hub bearing is fixedly arranged on the main body of the detection equipment, and is electrically connected with the main body of the detection equipment, the loading device, and the positioning device. The control device is the control device for the negative clearance of the wheel hub bearing as claimed in claim 3 . 6 . The detection device for the negative clearance of a wheel hub bearing according to claim 5 , wherein the positioning device comprises a displacement sensor, and the displacement sensor is used to detect the displacement of the inner ring of the wheel hub bearing to be measured. 7 . and the displacement of the inner ring of the hub bearing with zero initial clearance. 7 . The detection device for the negative clearance of a wheel hub bearing according to claim 5 , wherein the loading device is an electric cylinder or a hydraulic cylinder. 8 .

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