CN109724510B - A direct-measuring eddy current on-line detection device for wheel hub bearing axial negative clearance - Google Patents

Abstract

The invention discloses a direct measurement type eddy current online detection device with negative axial clearance of a wheel hub bearing, comprising an eddy current displacement detection device, a transition sleeve and a pressure sensor. The eddy current displacement detection device includes a base placed on the workbench of the riveting equipment, the base is provided with an installation support rod, the installation support rod is equipped with an eddy current installation platform, the eddy current installation platform is equipped with an eddy current sensor, and the eddy current installation platform A switchable magnetic force transfer assembly is arranged above, and the switchable magnetic force transfer assembly is placed on the small inner ring of the wheel hub bearing. The switchable magnetic transfer component uses the magnetic principle to follow the synchronous displacement change of the small inner ring of the wheel hub bearing during operation, so as to measure the change of the axial negative clearance of the wheel hub bearing, and realize the direct measurement type of the negative axial clearance of the wheel hub bearing. On-line detection, the present invention is convenient and firm to install, simple to operate, and accurate and efficient in measurement data.

Description

A direct-measuring eddy current on-line detection device for wheel hub bearing axial negative clearance

technical field

The invention relates to a clearance detection device for a wheel hub bearing, in particular to a direct measurement type eddy current online detection device for the negative axial clearance of the wheel hub bearing.

Background technique

Riveted hub bearings are preloaded in the axial direction through riveted assembly, thereby generating negative clearance. The interference formed by a reasonable negative clearance can provide a reserve for the wear of the hub bearing during use, and improve the bearing capacity of the hub bearing unit. Therefore, the rationality of the negative clearance is directly related to the working performance of the hub bearing. and service life.

The riveted hub bearing adopts the shaft end flanging and riveting assembly, which is an irreversible assembly, that is, the negative clearance is fixed after the hub bearing is riveted. At present, manufacturers mainly use the method of riveting and re-testing for riveted wheel hub bearings, so it is difficult to accurately control the negative clearance of wheel hub bearings during the riveting process. Therefore, when the axial clearance is unqualified, the product cannot be repaired, which seriously affects the stability of the product quality.

The negative clearance value of the bearing is extremely small, which needs to be precisely controlled within the range of 0 to -0.04mm, and is greatly affected by the space constraints of the machine tool and its vibration. It can be seen from this that the on-line measurement device of wheel hub bearing not only has high performance requirements but also is difficult to design.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a direct measurement type eddy current online detection device for the negative axial clearance of the wheel hub bearing.

In order to achieve the above object, the present invention adopts the following technical solutions:

A direct-measuring eddy current online detection device with negative axial clearance of a wheel hub bearing, comprising an eddy current displacement detection device, a transition sleeve, and a pressure sensor. An installation support rod is arranged on the base, an eddy current installation platform is installed on the installation support rod, an eddy current sensor is installed on the eddy current installation platform, and a switchable magnetic force transfer assembly is arranged above the eddy current installation platform. The switchable magnetic force The adapter assembly is placed on the small inner ring of the hub bearing, the eddy current sensor is locked on the eddy current mounting platform by bolts, and the switchable magnetic force adapter assembly includes a bottom box made of non-magnetic conductive material and a The bottom box is fitted with the small inner ring of the hub bearing and is made of magnetically conductive material. The bottom box is provided with a rotating ring made of non-magnetically conductive material. The closing bottom is installed on the bottom box, the fitting bottom is under the rotating ring, the pressure plate is installed on the rotating ring, the target plate is installed on the pressure plate, the non-magnetic conductive area is evenly distributed on the circumference of the bottom box, and the circumference of the rotating ring is evenly distributed. Some magnets.

The installation strut is provided with a sleeve, and the sleeve is provided with a split pin for attaching the eddy current installation platform.

The fitting bottom and the target plate are made of steel material, and the bottom box, the rotating ring and the pressing plate are made of aluminum material.

The above scheme has the following advantages:

1. The device can realize the direct measurement online detection of the negative axial clearance of the hub bearing;

2. The device adopts eddy current sensor, which is characterized by: automatic data acquisition, high measurement accuracy, fast response speed, convenient measurement process and high reliability;

3. Using a switchable magnetic transfer component, the occasions that were difficult to use eddy current sensors can be easily used;

4. The device uses the magnetic principle to closely fit the switchable magnetic force transfer assembly on the small inner ring of the hub bearing, so that the switchable magnetic force transfer assembly can follow the synchronous displacement change of the small inner ring of the wheel hub bearing during operation.

Description of drawings

Accompanying drawing 1 is the structural representation of the present invention;

Accompanying drawing 2 is the rear view schematic diagram of the present invention;

Accompanying drawing 3 is the right side schematic diagram of the present invention;

Accompanying drawing 4 is the structural representation of wheel hub bearing;

FIG. 5 is a schematic structural diagram of the switchable magnetic force transfer assembly in the present invention.

FIG. 6 is a schematic top view of the switchable magnetic force transfer assembly in the present invention.

FIG. 7 is a schematic cross-sectional structure diagram at A-A of FIG. 4 .

In the figure: 1—workbench, 2—base, 3—sleeve, 4—cotter pin, 5—installation rod, 6—eddy current sensor, 7—eddy current installation platform, 8—transition sleeve, 9—pressure sensor , 10—bottom box, 11—fit bottom, 12—rotating ring, 13—magnet, 14—pressing plate, 15—target plate, 16—non-magnetically conductive area, 17—switchable magnetic force transfer assembly, 18—wheel hub bearing , 19 - small inner ring of hub bearing, 20 - small inner shaft, 21 - rivet head, 22 - bolt.

Detailed ways

In order to facilitate the understanding of those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

As shown in Figures 1-7, a direct-measuring eddy current online detection device for the negative axial clearance of a wheel hub bearing includes an eddy current displacement detection device, a transition sleeve 8, and a pressure sensor 9. The eddy current displacement detection device includes The base 2 installed on the workbench 1 of the riveting equipment, the base 2 is provided with four mounting struts 5, the mounting struts 5 are equipped with an eddy current mounting platform 7, and the eddy current mounting platform 7 is equipped with an electric current. Eddy current sensor 6, a switchable magnetic force transfer assembly 17 is arranged above the eddy current installation platform 7, the switchable magnetic force transfer assembly 17 is placed on the small inner ring 19 of the hub bearing, and the eddy current sensor 6 is locked by bolts 22. On the eddy current installation platform 7, a plurality of eddy current sensors 6 are installed on the eddy current installation platform 7, usually three eddy current sensors 6 are installed, three points are used for measurement, and three points determine a plane, so as to realize the axial direction of the hub bearing 18. Accurate measurement of negative clearance.

The switchable magnetic force transfer assembly 17 includes a bottom box 10 made of non-magnetically conductive material and a fitting bottom 11 made of magnetically conductive material for fitting the small inner ring 19 of the wheel hub bearing. The movable is provided with a rotating ring 12 made of non-magnetic conductive material, the bottom 11 is fitted on the bottom box 10, the bottom 11 is located under the rotating ring 12, the pressure plate 14 is installed on the rotating ring 12, and the target plate 15 is installed on the pressure plate 14, the non-magnetically conductive area 16 is evenly distributed on the circumference of the bottom box 10, a number of magnets 13 are evenly distributed on the circumference of the rotating ring 12, the bottom 11 and the target plate 15 are made of steel material, and the bottom box 10 is made of steel. , The rotating ring 12 and the pressing plate 14 are made of aluminum material, which can effectively avoid the influence of magnetism on the eddy current sensor 6. After the rotating ring 12 is rotated at a certain angle, the magnet 13 is in contact with the fitting bottom 11 to realize the magnetization of the fitting bottom 11. , so that the switchable magnetic force transfer assembly 17 is attached to the small inner ring 19 of the hub bearing. When the switchable magnetic force transfer assembly 17 is to be removed, the rotating ring 12 rotates, so that the magnet 13 is transferred to the non-rotating ring on the bottom box 10 The magnetic conductive area 16 makes the fitting bottom 11 in a demagnetized state and can be easily removed. In addition, the inner ring of the rotating ring 12 is generally designed as a trapezoid to prevent hindering the normal operation of the rivet head 21. In addition, due to the rotating ring 12 and The fitting bottom 11 can be replaced with different sizes, and can adapt to the small inner ring 19 of the wheel hub bearing with different diameters. Therefore, the switchable magnetic force adapter assembly 17 can be used for the direct measurement of the negative axial clearance of the wheel hub bearing 18 of different sizes and models. On-line eddy current testing.

The installation support rod 5 is equipped with a sleeve 3, and the sleeve 3 is provided with a split pin 4 for attaching the eddy current installation platform 7. By setting the sleeve 3, the installation is made more compact, and the cotter pin 4 is used to increase the force point. , reduce the loosening caused by vibration during the riveting process. In addition, through the cotter pin 4, it can be easily replaced and replaced, which can be more convenient when changing the product model, because the cotter pin 4 and the sleeve 3 are easy to process, and The accuracy can be ensured, the error caused by the installation gap can be reduced, and the whole device can be installed firmly and replaced easily.

The small inner ring 19 of the wheel hub bearing is fitted with the fitting bottom 11. At this time, the fitting bottom 11 is magnetic, and the magnetism is used to ensure the close fitting of the switchable magnetic force transfer assembly 17 and the small inner ring 19 of the wheel hub bearing. When the wheel hub bearing 18 is pressed down, the switchable magnetic force transfer assembly 17 follows the small inner ring 19 of the hub bearing and undergoes a synchronous displacement change, and the switchable magnetic force transfer assembly 17 converts the displacement of the wheel hub bearing small inner ring 19 into a switchable magnetic force transfer assembly The displacement of 17 is measured by the eddy current sensor 7 to measure the displacement of the switchable magnetic force transfer assembly 17 , so as to obtain the axial negative clearance value of the hub bearing 18 .

The specific working principle of the present invention is as follows: the hub bearing 18 to be riveted with zero initial clearance is installed on the transition sleeve 8 and then placed on the base 2, and a pressure sensor 9 is arranged between the base 2 and the transition sleeve 8, and the pressure The upper end surface of the sensor 9 is in contact with the bottom surface of the transition sleeve 8, and the lower end surface is in contact with the base 2. Place the switchable magnetic force transfer assembly 17 on the hub bearing 18, close the magnetic circuit, and the switchable magnetic force transfer assembly 17 and the hub bearing 18. The tight fit of the inner ring 19.

Start the riveting equipment. The riveting head 21 of the riveting equipment applies axial pressure to the flange of the small inner shaft 20 of the workpiece to be riveted. When the pressure sensor 9 detects that the axial pressure is equal to the preset pressure value, the eddy current is read at this time. The measured value of the target plate 15 by the sensor 6 is marked as the A value. At this time, the position of the hub bearing 18 is the reference position of the initial zero clearance; at the reference position of the initial zero clearance, the hub bearing 18 and the transition sleeve 8 are to be riveted. and the pressure sensor 9 are compacted with each other, the gap between them is eliminated, and the axial pressure is continuously applied to the flange of the small inner shaft 20, the hub bearing 18 forms a negative clearance, and the eddy current sensor 6 conducts real-time measurement of the negative clearance. Measurement, when the measured negative clearance reaches a reasonable range, the riveting equipment is reset, the riveting head 21 gradually leaves the hub bearing 18, the axial pressure on the hub bearing 18 gradually decreases and elastic recovery occurs, and the target plate 15 moves upward, The negative clearance value measured by the eddy current sensor 6 in real time decreases. When the pressure sensor 9 detects that the pressure value is equal to the preset pressure value again, the measured value of the eddy current sensor 6 is read and marked as the B value, and the B value is calculated. The difference between the value A and the value A is the negative clearance of the hub bearing 18 .

It should be noted that the above description is not a limitation of the present invention, and any obvious replacements are within the protection scope of the present invention without departing from the inventive concept of the present invention.

Claims (3)

1. A direct-measuring type eddy current online detection device for axial negative clearance of a hub bearing comprises an eddy current displacement detection device, a transition sleeve and a pressure sensor, wherein the eddy current displacement detection device comprises a base arranged on a riveting equipment workbench, and the direct-measuring type eddy current online detection device is characterized in that an installation supporting rod is arranged on the base, an eddy current installation platform is arranged on the installation supporting rod, an eddy current sensor is arranged on the eddy current installation platform, a switchable magnetic force switching assembly is arranged above the eddy current installation platform and is arranged on a small inner ring of the hub bearing, the eddy current sensor is locked on the eddy current installation platform through bolts, the switchable magnetic force switching assembly comprises a bottom box made of non-magnetic materials and a laminating bottom which is used for laminating and installing the small inner ring of the hub bearing and is made of magnetic materials, and a rotating ring made of non-magnetic materials is arranged on the bottom box, the rotary ring and the bottom box can mutually rotate circumferentially, the laminating bottom is arranged on the bottom box and is positioned below the rotary ring, the pressing plate is arranged on the rotary ring, the target plate is arranged on the pressing plate, the non-magnetic conduction areas are uniformly distributed on the circumference of the bottom box, and the magnets are uniformly distributed on the circumference of the rotary ring.

2. The hub bearing axial negative clearance direct-measuring type eddy current online detection device according to claim 1, wherein a sleeve is mounted on the mounting support rod, and a cotter pin for mounting the eddy current mounting platform is arranged on the sleeve.

3. The direct-measuring eddy current online detection device for the axial negative clearance of the hub bearing as claimed in claim 2, wherein the joint bottom and the target plate are made of steel material, and the bottom box, the rotating ring and the pressure plate are made of aluminum material.

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