Hub clearance measuring device and method

Abstract

The invention discloses a hub clearance measuring device and method. The hub clearance measuring device comprises an automobile high-low temperature environment bin, a motor, a bearing seat, a three-jaw chuck, a sample piece fixing tool, a thrust plate and a servo electric cylinder. The automobile high-low temperature environment cabin comprises a cabin body and a cabin cover. The bearing seat is contained in the cabin body, the motor is arranged outside the automobile high-low temperature environment cabin, and an output shaft of the motor is in transmission connection with one end of the bearing seat; the three-jaw chuck is accommodated in the cabin body and is fixed on the rotating shaft at the other end of the bearing seat through a bolt; the sample piece fixing tool is coaxially clamped between clamping jaws of the three-jaw chuck; the servo electric cylinder is accommodated and arranged in the cabin body, and the end part of a telescopic shaft of the servo electric cylinder is coaxially fixed at the rear end of the thrust plate; the front end face of the thrust plate is adjacent to the end of the sample piece fixing tool, and the sample piece fixing tool, the thrust plate and the servo electric cylinder are coaxial. The device can simulate the use environment temperature, can automatically measure data, and can meet the measurement requirements of the hub clearance at different environment temperatures in the hub development stage.

Description

Technical Field

[0001] The invention relates to the technical field of bearing axial clearance detection, and in particular to a hub clearance measuring device and method. Background Art

[0002] The wheel hub unit is an important component of the drive axle or front axle assembly. Its structure is mainly composed of a wheel hub shell and a bearing unit, among which the bearing is the core component of the wheel hub unit. The quality of its installation determines the performance level of the product. The hub clearance is one of the core indicators for evaluating the bearing installation effect. It exists to ensure that the wheel hub bearing can operate flexibly and without obstruction. If the hub bearing clearance is too large, it will affect the rotation accuracy of the bearing. If the hub bearing clearance is too small, it will easily cause the bearing to get stuck. Therefore, it is necessary to measure the bearing clearance value to ensure the normal operation and production quality of the wheel hub unit.

[0003] Chinese patent authorization announcement number CN101825427B discloses a method for measuring the clearance of a hub bearing unit assembly, ① placing the hub bearing unit assembly on the lower floating base, inserting the bolts on the hub bearing unit assembly into the bolt holes of the base, so that the hub bearing unit assembly is fixed on the lower floating base; ② starting the hydraulic cylinder, the hydraulic cylinder drives the clamping and lifting device to move toward each other from both sides to clamp the outer flange of the hub bearing unit assembly, so that the clamping and lifting device is stuck on the lower end surface of the outer flange of the hub bearing unit assembly, and then starting the clamping and lifting device again to lift the outer flange of the hub bearing unit assembly upward; ③. The servo motor drives the rotating spindle to rotate through the flexible coupling. The spindle is connected to the lower floating base, driving the inner flange to rotate and measure. The hub bearing unit assembly to be measured loads the outer flange through the clamping and lifting device. The universal floating sleeve die and the upper load micro-loading device above the outer flange are connected to the sensor. The lower load is applied evenly to the inner flange through the set computer program, and the inner flange, outer flange and steel ball retainer are contacted through the lower floating base. The spindle driven by the servo motor starts to rotate. After the outer flange of the hub bearing unit assembly rotates 8-15 times, the sensor collects 1 ④. Start the servo motor again to drive the lower floating base and the inner flange of the hub bearing unit assembly to rotate. , so that the inner flange and outer flange raceways of the hub bearing unit assembly and the ball retainer are fully in contact, so that it reaches another extreme position B; the computer collects the two signals A and B and processes them in time. After the measurement data of the upper and lower extreme displacements are processed by the computer, the clearance value is directly displayed on the display screen; ⑤, stop clamping the outer flange of the hub bearing unit assembly and the clamping lifting device, the outer flange of the hub bearing unit assembly and the inner flange of the hub bearing unit assembly are in a stationary state, the servo hydraulic cylinder is unloaded, the hub bearing unit assembly and the lower floating base move downward, and the hub bearing unit assembly is taken out.

[0004] Chinese patent authorization announcement number CN103090835B discloses an analog automobile wheel hub bearing axial clearance measuring device, including a workbench, a centering shaft, an axial clearance detection instrument and a power device for providing power for the rotation of the bearing to be tested, characterized in that: the centering shaft is fixed together by a support table and a workbench, and the centering shaft is provided with a long sleeve for fixing the inner ring of the bearing to be tested, a bearing sleeve for placing the bearing to be tested, a fastening device for pressing and fixing the outer ring of the bearing to be tested in the bearing sleeve, and a short sleeve for fixing the inner ring of the bearing to be tested, from left to right, the axial clearance detection instrument is installed on the bearing sleeve, and the power device is fixed to the bearing sleeve through a connecting device; the power device includes a loading body, the loading body is fixed to the bearing sleeve through a connecting device, a connecting shaft is arranged inside the loading body, the connecting shaft is connected to the loading body through a bearing, the bearing is connected to the loading body through a bearing gland, and a fastening sleeve is also arranged on the connecting shaft.

[0005] The above-mentioned wheel hub clearance measurement methods or devices are not applicable to the measurement of clearance at different temperatures, and their test methods have loopholes and cannot eliminate the errors caused by the blocking of bearing rollers.

[0006] With the iteration of product development, aluminum wheel hub products began to enter the market; the temperature changes of aluminum wheel hub shell and cast iron wheel hub shell are inconsistent. In order to better provide technical support for the development of aluminum wheel hub, test technology needs to simultaneously develop measurement devices and methods that can be applied to different temperatures. Summary of the invention

[0007] In order to solve the above problems, the present invention provides a wheel hub clearance measuring device, which has the functions of simulating the ambient temperature of use and automatically measuring data, and is also equipped with a unique testing method. It has high measurement accuracy and simple testing operation, and can meet the wheel hub clearance measurement needs at different ambient temperatures during the wheel hub development stage.

[0008] The present invention provides a wheel hub clearance measuring device, comprising an openable and closable automobile high and low temperature environment chamber, a motor, a bearing seat, a three-jaw chuck, a sample fixing tool, a thrust plate and a servo electric cylinder;

[0009] The openable and closable automobile high and low temperature environment chamber includes a chamber body and a cover. The openable and closable automobile high and low temperature environment chamber can conveniently take and place the samples to be tested. During the test, the simulated ambient temperature in the automobile high and low temperature environment chamber can be provided according to the test needs;

[0010] The bearing seat is contained in the cabin, and the motor is located outside the openable automobile high and low temperature environment chamber. The output shaft of the motor is connected to one end of the bearing seat. The motor provides power for the simulation test and is located outside the environment chamber to prevent the motor temperature from affecting the test results.

[0011] The three-jaw chuck is accommodated in the cabin, and the three-jaw chuck is fixed to the rotating shaft at the other end of the bearing seat by bolts;

[0012] The sample fixing fixture is coaxially clamped between the jaws of the three-jaw chuck, and the sample fixing fixture can coaxially limit and fix the sample to be tested;

[0013] The servo electric cylinder is accommodated and seated in the cabin. The end of the telescopic shaft of the servo electric cylinder is coaxially fixed to the rear end of the thrust plate. The telescopic shaft of the servo electric cylinder can be telescoped forward and backward. The thrust or tension of the pre-input parameter value is applied to the test sample. The telescopic length of the telescopic shaft is read from the servo electric cylinder, and the axial clearance of the wheel hub to be tested can be calculated.

[0014] The front end face of the thrust plate is adjacent to the end of the sample fixing fixture, and the sample fixing fixture, the thrust plate and the servo electric cylinder are coaxial. The front end of the thrust plate can be fixed with bolts to the sample to be tested, and the inside and the front end of the sample to be tested are limited and fixed by the sample fixing fixture. When the telescopic shaft of the servo electric cylinder is extended and retracted, the sample to be tested can be compressed or stretched under set pressure or tension conditions synchronously, so that the axial clearance of the sample to be tested can be measured.

[0015] The output shaft of the motor is connected to the rotating shaft of the bearing seat through the transmission shaft, and the output shaft of the motor, the two ends of the transmission shaft and the rotating shaft of the bearing seat are fixedly connected by flanges.

[0016] The flange end of the rotating shaft of the bearing seat is rotatably exposed outside the side wall of the openable high and low temperature environment chamber of the automobile.

[0017] The openable and closable automobile high and low temperature environment chamber is provided with a shaft connection hole on one side corresponding to the bearing seat, and the rotating shaft of the bearing seat is rotatably sleeved in the shaft connection hole.

[0018] The shaft connection hole is arranged on a side wall of the cabin body corresponding to the bearing seat; or, the shaft connection hole is formed by connecting semicircular notches respectively opened on the connecting edges of the cabin body and the hatch cover.

[0019] The motor comprises a motor bracket, and the motor is fixed on the ground through the motor bracket; the servo electric cylinder comprises an electric cylinder bracket, and the servo electric cylinder is fixedly connected to the bottom wall of the cabin through the electric cylinder bracket.

[0020] The sample fixing tooling includes a truncated cone-shaped connecting shaft and a locking nut. The locking nut is threadedly connected to the front end of the truncated cone-shaped connecting shaft, and the rear end of the truncated cone-shaped connecting shaft is clamped and fixed between the jaws of the three-jaw chuck. When the bearing sleeve of the sample to be tested is limited on the truncated cone-shaped connecting shaft, the locking nut is threadedly connected to the truncated cone-shaped connecting shaft until the locking nut contacts the half-shaft mounting surface of the sample to be tested. The sample to be tested is limited and fixed in both axial and circumferential directions by screwing the locking nut and the truncated cone-shaped connecting shaft.

[0021] The thrust plate includes a baffle, a flange, a first ball bearing, a sleeve, a second ball bearing and a cover plate. An upper three-step step hole is provided from the upper end to the middle of the flange, and an inverted lower two-step step hole is provided from the middle to the lower end of the flange. The upper three-step step hole and the inverted lower two-step step hole constitute the through hole of the flange; the front end of the telescopic shaft of the servo electric cylinder is respectively sleeved in the cover plate, the second ball bearing, the sleeve and the first ball bearing, and the front end face of the telescopic shaft of the servo electric cylinder is in limited contact with the inner end face of the baffle. The first step surface of the upper three-step step hole of the flange is evenly provided with at least two bolt fixing notches in the circumferential direction. The upper three-step step hole and the inverted lower two-step step hole of the flange are respectively sleeved in the cover plate, the second ball bearing, the sleeve and the first ball bearing, and the front end face of the telescopic shaft of the servo electric cylinder is in limited contact with the inner end face of the baffle. The first step surface of the upper three-step step hole of the flange is evenly provided with at least two bolt fixing notches in the circumferential direction. The lower secondary step hole is sleeved with a baffle, a first ball bearing, a sleeve and a second ball bearing in sequence from top to bottom; the baffle is sleeved in the first hole of the upper three-step hole, the baffle is a circular sheet as a whole, and a first convex ring is protruding on its inner end surface, the first convex ring is aligned and contacted with the end surface of the first ball bearing, and the outer circumference of the inner end surface of the baffle is suspended and adjacent to the secondary step surface of the upper three-step hole, the first ball bearing is sleeved in the secondary hole of the upper three-step hole, and the upper and lower end surfaces of the first ball bearing are respectively in contact with the first convex ring and the third step surface of the upper three-step hole; the lower end of the second ball bearing is in contact with the inverted lower secondary step hole The second-level step surface, the sleeve is sleeved on the inner side wall of the flange between the third-level step surface of the upper three-level step hole and the second-level step surface of the inverted lower second-level step hole, and the upper and lower end surfaces of the sleeve are respectively limitedly contacted with the corresponding end surfaces of the first ball bearing and the second ball bearing, and the inner end surface of the cover plate is protrudingly provided with a second convex ring, and the second convex ring is matched and contacted with the second ball bearing. The outer circumference of the inner end surface of the cover plate matches and covers the lower end surface of the flange, and the inner end surface of the cover plate is suspended and adjacent to the lower end surface of the flange. At least two bolts are evenly arranged on the outer end surface of the cover plate corresponding to the lower end surface of the flange. Each bolt passes through the cover plate and is screwed and fixed to the lower end surface of the flange, and the middle part of the baffle is screwed and fixed There are two fixing bolts, and the baffle and the telescopic shaft of the servo electric cylinder can be fixedly connected by the fixing bolts. After the thrust plate is assembled, the flange on it can rotate relatively with the telescopic shaft of the servo electric cylinder, that is, the baffle, the first ball bearing, the sleeve, the second ball bearing and the cover plate are in close contact in the axial direction, but the baffle does not contact the secondary step surface of the upper three-step step hole in the position and is in suspended contact, and the cover plate does not contact the lower end surface of the corresponding flange and is also in suspended contact. The baffle and the cover plate do not lock the corresponding flange surfaces in contact, so that after the flange is bolted to the half-axle mounting surface of the wheel hub, the flange can rotate with the motor.

[0022] It also includes a wheel hub sample to be tested, which includes a half-axle mounting surface, a truncated cone-shaped connecting shaft sleeved in the wheel hub sample to be tested, the front end of the truncated cone-shaped connecting shaft is exposed outside the half-axle mounting surface, the outer diameter of the locking nut is larger than the inner diameter of the through hole of the half-axle mounting surface, the locking nut is in contact with the half-axle mounting surface, the wheel hub sample to be tested is screwed and fixed by the truncated cone-shaped connecting shaft and the locking nut, the first step surface of the upper three-step step hole of the flange of the thrust plate is in contact with the half-axle mounting surface, and the bolt limiter is embedded in the bolt fixing notch and is screwed and fixed to the half-axle mounting surface.

[0023] A hub clearance measuring method is applied to the hub clearance measuring device, and the steps are as follows:

[0024] S1. Install the wheel hub sample to be tested on the sample fixing fixture and pre-tighten the locking nut according to the designed value;

[0025] S2. Open the openable and closable automobile high and low temperature environment chamber, hoist the hatch cover to another position, operate the servo electric cylinder to move the telescopic axis away from the bearing seat to the farthest end, and leave installation and operation space for the wheel hub sample to be tested and the sample fixing tooling;

[0026] S3, loosen the jaws of the three-jaw chuck to a suitable position, and clamp the rear end of the truncated cone-shaped connecting shaft of the sample fixing tool into the jaws of the three-jaw chuck;

[0027] S4. Operate the servo electric cylinder to move the telescopic axis toward the bearing seat. When the first step surface of the upper three-step step hole of the flange on the thrust plate fits with the half-shaft mounting surface of the wheel hub sample to be tested, rotate the flange. When the bolt fixing notch of the flange is rotated to align with the connection hole position of the half-shaft mounting surface, screw the two together with bolts;

[0028] S5. Reset the hatch cover, start the openable and closeable automobile high and low temperature environment chamber, preset the test temperature, and keep the constant temperature running for 4 hours after reaching the test temperature;

[0029] After S6 and S5 are completed, start the servo electric cylinder to make its telescopic shaft continue to move toward the bearing seat. When the thrust value displayed by the servo electric cylinder reaches 500N, stop the servo electric cylinder; start the motor and rotate it at a speed of 1-10 rpm for 1-2 minutes. The purpose of rotating for 1-2 minutes is to use the motor to drive the shaft head tooling to rotate, so that the hub shell and the shaft head move relative to each other, avoiding the measurement error caused by the bearing being stuck. Stop the motor, and then read the position data of the telescopic shaft of the servo electric cylinder at this time, and record it as P1;

[0030] After S7 and S6 are completed, start the servo electric cylinder again to move the telescopic axis away from the bearing seat. When the tension value displayed by the servo electric cylinder reaches 500N, stop the servo electric cylinder; start the motor, rotate it at a speed of 1-10 rpm for 1-2 minutes, stop the motor, and then read the position data of the telescopic axis of the servo electric cylinder at this time, and record it as P2;

[0031] S8. Calculate the clearance value: δ = |P1-P2|, and obtain the clearance value of the wheel hub sample to be tested at the set temperature.

[0032] Beneficial Effects

[0033] The present invention can simulate the ambient temperature and realize the measurement of the wheel hub clearance at different temperatures, which can provide rich test data for the design and guide the design improvement; at the same time, the device can realize the full-automatic measurement of the clearance, which greatly reduces the measurement error caused by insufficient manual experience; the testing method matched with the test device utilizes a motor to drive the shaft head tooling to rotate, so that the wheel hub shell and the shaft head move relative to each other, avoiding the measurement error caused by the bearing being stuck; through the device and the evaluation method, the wheel hub clearance measurement at different temperatures can be realized, which provides technical support for the development of aluminum wheel hub shells and reduces the development risk of aluminum wheel hub shells. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0035] Figure 2 It is a schematic diagram of the working principle structure of the present invention.

[0036] Figure 3 It is a schematic diagram of the enlarged and exploded structure of the sample fixing fixture and the wheel hub sample to be tested of the present invention.

[0037] Figure 4 It is a schematic diagram of the enlarged cross-section structure of the thrust plate of the present invention.

[0038] Figure 5 It is a three-dimensional enlarged structural schematic diagram of the thrust plate of the present invention.

[0039] In the figure:

[0040] 1. Openable and closable automobile high and low temperature environment chamber; 11. Chamber; 12. Hatch cover; 13. Axis connection hole;

[0041] 2. Motor; 21. Motor bracket;

[0042] 3. Bearing seat;

[0043] 4. Three-jaw chuck;

[0044] 5. Sample fixing tool; 51. Cone-shaped connecting shaft; 52. Locking nut;

[0045] 6. thrust plate; 61. baffle; 611. first convex ring; 62. flange; 621. first step surface of the upper three-step step hole; 6211. bolt fixing notch; 622. first hole of the upper three-step step hole; 623. second step surface of the upper three-step step hole; 624. second hole of the upper three-step step hole; 625. third step surface of the upper three-step step hole; 626. second step surface of the inverted lower second step hole; 63. first ball bearing; 64. sleeve; 65. second ball bearing; 66. cover plate; 661. second convex ring;

[0046] 7. Servo electric cylinder; 71. Electric cylinder bracket;

[0047] 8. Transmission shaft;

[0048] 9. Wheel hub sample to be tested; 91. Axle shaft mounting surface. DETAILED DESCRIPTION

[0049] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, not all.

[0050] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] Example 1

[0053] See also Figure 1-Figure 5 As shown, a wheel hub clearance measuring device includes an openable and closable automobile high and low temperature environment chamber 1, a motor 2, a bearing seat 3, a three-jaw chuck 4, a sample fixing tool 5, a thrust plate 6 and a servo electric cylinder 7;

[0054] The openable and closable automobile high and low temperature environment chamber 1 comprises a chamber body 11 and a chamber cover 12;

[0055] The bearing seat 3 is accommodated in the cabin 11, and the motor 2 is arranged outside the openable and closable automobile high and low temperature environment cabin 1, and the output shaft of the motor 2 is drivingly connected to one end of the bearing seat 3;

[0056] The three-jaw chuck 4 is accommodated in the cabin 11, and the three-jaw chuck 4 is fixed to the rotating shaft at the other end of the bearing seat 3 by bolts;

[0057] The sample fixing fixture 5 is coaxially clamped between the jaws of the three-jaw chuck 4;

[0058] The servo electric cylinder 7 is accommodated and seated in the cabin 11, and the end of the telescopic shaft of the servo electric cylinder 7 is coaxially fixed to the rear end of the thrust plate 6;

[0059] The front end surface of the thrust plate 6 is adjacent to the end of the sample fixing fixture 5 , and the sample fixing fixture 5 , the thrust plate 6 and the servo electric cylinder 7 are coaxial.

[0060] The output shaft of the motor 2 is connected to the rotating shaft of the bearing seat 3 through the transmission shaft 8. The output shaft of the motor 2, the two ends of the transmission shaft 8 and the rotating shaft of the bearing seat 3 are fixedly connected by flanges.

[0061] The flange end of the rotating shaft of the bearing seat 3 is rotatably exposed outside the side wall of the openable and closable automobile high and low temperature environment chamber 1 .

[0062] The openable and closable automobile high and low temperature environment chamber 1 is provided with a shaft connection hole 13 on one side corresponding to the bearing seat 3 , and the rotating shaft of the bearing seat 3 is rotatably sleeved in the shaft connection hole 13 .

[0063] The shaft connection hole 13 is formed by connecting semicircular notches respectively opened on the connecting edges of the cabin body 11 and the cabin cover 12.

[0064] The motor 2 includes a motor bracket 21 , and the motor 2 is fixed to the ground through the motor bracket 21 ; the servo electric cylinder 7 includes an electric cylinder bracket 71 , and the servo electric cylinder 7 is fixedly connected to the inner bottom wall of the cabin 11 through the electric cylinder bracket 71 .

[0065] The sample fixing tool 5 includes a truncated cone-shaped connecting shaft 51 and a locking nut 52 . The locking nut 52 is threadedly connected to the front end of the truncated cone-shaped connecting shaft 51 , and the rear end of the truncated cone-shaped connecting shaft 51 is clamped and fixed between the jaws of the three-jaw chuck 4 .

[0066] The thrust plate 6 includes a baffle 61, a flange 62, a first ball bearing 63, a sleeve 64, a second ball bearing 65 and a cover plate 66. An upper three-step step hole is provided from the upper end to the middle of the flange 62, and an inverted lower two-step step hole is provided from the middle to the lower end of the flange 62. The upper three-step step hole and the inverted lower two-step step hole constitute the flange through-hole; the front end of the telescopic shaft of the servo electric cylinder 7 is respectively sleeved in the cover plate 66, the second ball bearing 65, the sleeve 64 and the first ball bearing 63, and the front end face of the telescopic shaft of the servo electric cylinder 7 is in contact with the inner end face of the baffle 61, and the flange 62 is provided with an upper three-step step hole. The first step surface 621 of the upper three-step step hole is evenly provided with two bolt fixing notches 6211 in the circumferential direction. The upper three-step step hole and the inverted lower two-step step hole of the flange 62 are sleeved with a baffle 61, a first ball bearing 63, a sleeve 64 and a second ball bearing 65 in sequence from top to bottom; the baffle 61 is sleeved in the first hole 622 of the upper three-step step hole. The baffle 61 is a circular sheet as a whole, and a first convex ring 611 is protruding on its inner end surface. The first convex ring 611 is aligned with the end surface of the first ball bearing 63 and is in contact with the end surface of the first ball bearing 63. The outer circumference of the inner end surface of the baffle 61 is aligned with the second circumference of the upper three-step step hole. The first ball bearing 63 is sleeved in the secondary hole 624 of the upper three-step hole, and the upper and lower end surfaces of the first ball bearing 63 are respectively in contact with the first convex ring 611 and the third step surface 625 of the upper three-step hole; the lower end of the second ball bearing 65 is in contact with the second step surface 626 of the inverted lower second step hole, and the sleeve 64 is sleeved on the inner side wall of the flange between the third step surface 625 of the upper three-step hole and the second step surface 626 of the inverted lower second step hole, and the upper and lower end surfaces of the sleeve 64 are respectively in contact with the first ball bearing 63 and the second ball bearing 65 corresponds to the end face limit contact, the inner end face of the cover plate 66 is protrudingly provided with a second convex ring 661, the second convex ring 661 is matched and contacted on the second ball bearing 65, the outer circumference of the inner end face of the cover plate 66 matches and covers the lower end face of the flange 62, the inner end face of the cover plate 66 and the lower end face of the flange 62 are suspended and adjacent, the outer end face of the cover plate 66 corresponds to the lower end face of the flange 62 and two bolts are evenly arranged around the circumference, each bolt passes through the cover plate 66 and is screwed and fixed to the lower end face of the flange 62, the middle part of the baffle plate 61 is screwed and fixed with two fixing bolts, the baffle plate and the telescopic shaft of the servo electric cylinder can be fixedly connected by fixing bolts.

[0067] It also includes a wheel hub sample 9 to be tested, which includes a half-axle mounting surface 91, a truncated cone-shaped connecting shaft 51 sleeved in the wheel hub sample 9 to be tested, the front end of the truncated cone-shaped connecting shaft 51 is exposed outside the half-axle mounting surface 91, the outer diameter of the locking nut 52 is larger than the inner diameter of the through hole of the half-axle mounting surface 91, the locking nut 52 is in contact with the half-axle mounting surface 91, the wheel hub sample 9 to be tested is fixed by screwing the truncated cone-shaped connecting shaft 51 and the locking nut 52, the first step surface 621 of the upper three-step step hole of the flange 62 of the thrust plate 6 is in contact with the half-axle mounting surface 91, and the bolt limiter is embedded in the bolt fixing notch 6211 and is screwed and fixed to the half-axle mounting surface 91.

[0068] Example 2

[0069] See also Figure 1-Figure 5 As shown, a hub clearance measurement method is applied to the hub clearance measurement device, and the steps are as follows:

[0070] S1, installing the wheel hub sample 9 to be tested on the sample fixing fixture 5, and pre-tightening the locking nut 52 according to the designed value;

[0071] S2. Open the openable and closable automobile high and low temperature environment chamber 1, hoist the hatch 12 to another position, operate the servo electric cylinder 7 to move its telescopic axis away from the bearing seat 3 to the farthest end, and leave installation and operation space for the wheel hub sample 9 to be tested and the sample fixing tool 5;

[0072] S3, loosen the jaws of the three-jaw chuck 4 to a suitable position, and clamp and fix the rear end of the truncated cone-shaped connecting shaft 51 of the sample fixing tool 5 in the jaws of the three-jaw chuck 4;

[0073] S4, operate the servo electric cylinder 7 to move the telescopic axis toward the bearing seat 3. When the first step surface 621 of the upper three-step step hole of the flange 62 on the thrust plate 6 fits with the half-shaft mounting surface 91 on the wheel hub sample 9 to be tested, rotate the flange 62. When the bolt fixing notch 6211 of the flange 62 is rotated to align with the connection hole position of the half-shaft mounting surface 91, screw the two together with bolts;

[0074] S5, hoist and reset the hatch cover 12, start the openable and closable automobile high and low temperature environment chamber 1, preset the test temperature, and keep the constant temperature for 4 hours after reaching the test temperature;

[0075] After S6 and S5 are completed, the servo electric cylinder 7 is started to make its telescopic shaft continue to move toward the bearing seat 3. When the thrust value displayed by the servo electric cylinder 7 reaches 500N, the servo electric cylinder 7 is stopped; the motor 2 is started and rotated at a speed of 1-10 rpm for 1-2 minutes, and then the motor 2 is stopped. Then, the position data of the telescopic shaft of the servo electric cylinder 7 at this time is read and recorded as P1;

[0076] After S7 and S6 are completed, the servo electric cylinder 7 is started again to move the telescopic axis away from the bearing seat 3. When the tension value displayed by the servo electric cylinder 7 reaches 500N, the servo electric cylinder 7 is stopped; the motor 2 is started and rotated at a speed of 1-10 rpm for 1-2 minutes, and then the motor 2 is stopped, and then the position data of the telescopic axis of the servo electric cylinder 7 at this time is read and recorded as P2;

[0077] S8. Calculate the clearance value: δ=|P1-P2|, and obtain the clearance value of the wheel hub sample 9 to be tested at the set temperature.

[0078] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A wheel hub clearance measuring device, characterized in that: It comprises an openable and closable automobile high and low temperature environment chamber (1), a motor (2), a bearing seat (3), a three-jaw chuck (4), a sample fixing tool (5), a thrust plate (6) and a servo electric cylinder (7); The openable and closable automobile high and low temperature environment chamber (1) comprises a chamber body (11) and a chamber cover (12); The bearing seat (3) is accommodated in the cabin (11), the motor (2) is located outside the openable and closable automobile high and low temperature environment cabin (1), and the output shaft of the motor (2) is drivingly connected to one end of the bearing seat (3); The three-jaw chuck (4) is accommodated in the cabin (11), and the three-jaw chuck (4) is fixed to the rotating shaft at the other end of the bearing seat (3) by bolts; The sample fixing tool (5) is coaxially clamped between the jaws of the three-jaw chuck (4); The servo electric cylinder (7) is accommodated and seated in the cabin (11), and the end of the telescopic shaft of the servo electric cylinder (7) is coaxially fixed to the rear end of the thrust plate (6); The front end surface of the thrust plate (6) is adjacent to the end of the sample fixing fixture (5), and the sample fixing fixture (5), the thrust plate (6) and the servo electric cylinder (7) are coaxial.

2. A wheel hub clearance measuring device according to claim 1, characterized in that: The output shaft of the motor (2) is transmission-connected to the rotating shaft of the bearing seat (3) via a transmission shaft (8); the output shaft of the motor (2), the two ends of the transmission shaft (8) and the rotating shaft of the bearing seat (3) are fixedly connected by flanges.

3. A hub clearance measuring device according to claim 2, characterized in that: The flange end of the rotating shaft of the bearing seat (3) is rotatably exposed outside the side wall of the openable and closable automobile high and low temperature environment chamber (1).

4. A hub clearance measuring device according to claim 3, characterized in that: The openable and closable automobile high and low temperature environment chamber (1) is provided with a shaft connection hole (13) on one side corresponding to the bearing seat (3), and the rotating shaft of the bearing seat (3) is rotatably sleeved in the shaft connection hole (13).

5. A hub clearance measuring device according to claim 4, characterized in that: The shaft connection hole (13) is arranged on a side wall of the cabin body (11) corresponding to the bearing seat (3); or, the shaft connection hole (13) is formed by connecting semicircular notches respectively opened on the connecting edges of the cabin body (11) and the cabin cover (12).

6. A hub clearance measuring device according to claim 5, characterized in that: The motor (2) comprises a motor bracket (21), and the motor (2) is fixed on the ground via the motor bracket (21); the servo electric cylinder (7) comprises an electric cylinder bracket (71), and the servo electric cylinder (7) is fixedly connected to the inner bottom wall of the cabin (11) via the electric cylinder bracket (71).

7. A hub clearance measuring device according to claim 6, characterized in that: The sample fixing tool (5) comprises a truncated cone-shaped connecting shaft (51) and a locking nut (52), wherein the locking nut (52) is threadedly connected to the front end of the truncated cone-shaped connecting shaft (51), and the rear end of the truncated cone-shaped connecting shaft (51) is clamped and fixed between the jaws of the three-jaw chuck (4).

8. A hub clearance measuring device according to claim 7, characterized in that: The thrust plate (6) comprises a baffle (61), a flange (62), a first ball bearing (63), a sleeve (64), a second ball bearing (65) and a cover plate (66); an upper three-step step hole is provided from the upper end to the middle of the flange (62); and an inverted lower two-step step hole is provided from the middle to the lower end of the flange (62); the upper three-step step hole and the inverted lower two-step step hole constitute the through hole of the flange; the front end of the telescopic shaft of the servo electric cylinder (7) is respectively sleeved in the cover plate (66), the second ball bearing (65), the sleeve (64) and the first ball bearing (63); and the front end surface of the telescopic shaft of the servo electric cylinder (7) is in limited contact with the inner end surface of the baffle (61); the flange (6 2) is provided with at least two bolt fixing notches (6211) evenly arranged in the circumferential direction, and the upper three-step hole and the inverted lower two-step hole of the flange (62) are sleeved with a baffle (61), a first ball bearing (63), a sleeve (64) and a second ball bearing (65) in sequence from top to bottom; the baffle (61) is sleeved in the first hole (622) of the upper three-step hole, the baffle (61) is a circular sheet as a whole, and a first convex ring (611) is protruding on its inner end surface, and the first convex ring (611) is aligned with the end surface of the first ball bearing (63) and is in contact with the outer circumference of the inner end surface of the baffle (61) and the upper three-step hole. The secondary step surface (623) is suspended and adjacent to each other. The first ball bearing (63) is sleeved in the secondary hole (624) of the upper three-step hole, and the upper and lower end surfaces of the first ball bearing (63) are respectively in contact with the first convex ring (611) and the third step surface (625) of the upper three-step hole; the lower end of the second ball bearing (65) is in contact with the secondary step surface (626) of the inverted lower secondary step hole, and the sleeve (64) is sleeved on the inner side wall of the flange between the third step surface (625) of the upper three-step hole and the second step surface (626) of the inverted lower secondary step hole, and the upper and lower end surfaces of the sleeve (64) are respectively in contact with the first ball bearing (63) and the second ball bearing (65). The cover plate (66) is provided with a second convex ring (661) on the inner end face thereof, and the second convex ring (661) is matched and contacted with the second ball bearing (65). The outer circumference of the inner end face of the cover plate (66) matches and covers the lower end face of the flange (62). The inner end face of the cover plate (66) and the lower end face of the flange (62) are suspended and adjacent to each other. The outer end face of the cover plate (66) is evenly provided with at least two bolts in the circumferential direction corresponding to the lower end face of the flange (62). Each bolt passes through the cover plate (66) and is screwed and fixed to the lower end face of the flange (62). Two fixing bolts are screwed and fixed in the middle of the baffle plate (61). The baffle plate (61) and the telescopic shaft of the servo electric cylinder (7) can be fixedly connected by fixing bolts.

9. A hub clearance measuring device according to claim 8, characterized in that: The invention also comprises a wheel hub sample (9) to be tested, which comprises a half-shaft mounting surface (91), a truncated cone-shaped connecting shaft (51) sleeved in the wheel hub sample (9) to be tested, a front end of the truncated cone-shaped connecting shaft (51) exposed outside the half-shaft mounting surface (91), an outer diameter of a locking nut (52) larger than an inner diameter of a through hole of the half-shaft mounting surface (91), the locking nut (52) contacts the half-shaft mounting surface (91), the wheel hub sample (9) to be tested is screwed and fixed by the truncated cone-shaped connecting shaft (51) and the locking nut (52), a first step surface (621) of an upper three-step step hole of a flange (62) of a thrust plate (6) contacts the half-shaft mounting surface (91), and a bolt limiter is embedded in a bolt fixing notch (6211) and screwed and fixed to the half-shaft mounting surface (91).

10. A method for measuring wheel hub clearance, applied to the wheel hub clearance measuring device as claimed in any one of claims 1 to 9, characterized in that: Here are the steps: S1, installing the wheel hub sample (9) to be tested on the sample fixing fixture (5), and pre-tightening the locking nut (52) according to the designed value; S2. Open the openable and closable automobile high and low temperature environment chamber (1), hoist the hatch cover (12) to another position, operate the servo electric cylinder (7) to move its telescopic axis away from the bearing seat (3) to the farthest end, and leave installation and operation space for the wheel hub sample (9) to be tested and the sample fixing tool (5); S3, loosen the jaws of the three-jaw chuck (4) to a suitable position, and clamp and fix the rear end of the truncated cone-shaped connecting shaft (51) of the sample fixing tool (5) in the jaws of the three-jaw chuck (4); S4, operate the servo electric cylinder (7) to move its telescopic axis in the direction of the bearing seat (3), when the first step surface (621) of the upper three-step step hole of the flange (62) on the thrust plate (6) is in contact with the half-shaft mounting surface (91) on the wheel hub sample (9) to be tested, rotate the flange (62), and when the bolt fixing notch (6211) of the flange (62) is rotated to align with the connection hole position of the half-shaft mounting surface (91), the two are screwed together and fixed with bolts; S5, hoisting and resetting the hatch cover (12), starting the openable and closable automobile high and low temperature environment chamber (1), setting the test temperature to a preset value, and maintaining the constant temperature for 4 hours after reaching the test temperature; After S6 and S5 are completed, the servo electric cylinder (7) is started to make its telescopic shaft continue to move toward the bearing seat (3). When the thrust value displayed by the servo electric cylinder (7) reaches 500N, the servo electric cylinder (7) is stopped; the motor (2) is started and rotated at a speed of 1-10 rpm for 1-2 minutes, and then the motor (2) is stopped. Then, the position data of the telescopic shaft of the servo electric cylinder (7) is read and recorded as P1; After S7 and S6 are completed, the servo electric cylinder (7) is started again to move the telescopic shaft away from the bearing seat (3). When the tension value displayed by the servo electric cylinder (7) reaches 500N, the servo electric cylinder (7) is stopped; the motor (2) is started and rotated at a speed of 1-10 rpm for 1-2 minutes, and then the motor (2) is stopped. Then, the position data of the telescopic shaft of the servo electric cylinder (7) is read and recorded as P2; S8. Calculate the clearance value: δ=|P1-P2|, and obtain the clearance value of the wheel hub sample (9) to be tested at a set temperature.

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