Friction torque measuring tool for tapered roller bearing under partial load state

Abstract

The application provides a kind of friction torque measuring tool of centripetal roller bearing under eccentric load state, including motor, sensor and test shaft, the test shaft is arranged on the inner ring of the bearing to be measured, the spline part is provided at one end of test shaft, the motor and sensor are sequentially connected at spline part, it further includes mounting seat and limiting seat, the mounting seat is formed by assembling, and mounting seat can be loaded in the outer ring of the bearing to be measured, the other end of test shaft is rotatably provided with extension, the end of extension is used to connect the load of loading piece, and extension is slidably connected on limiting seat, and limiting seat forms anti-rotation cooperation with limiting seat. In view of the deficiency of prior art, the application provides a kind of friction torque measuring tool of centripetal roller bearing under eccentric load state, which is simple to operate and stable in measurement.

Description

Technical Field

[0001] This invention relates to a fixture for measuring the friction torque of a self-aligning roller bearing under eccentric loading. Background Technology

[0002] Bearings are crucial components used for rotating support in mechanical bodies. A bearing typically includes an outer ring, an inner ring, and several rollers. Grooves are formed on the opposing walls of both the outer and inner rings, creating a raceway between the two grooves for the rollers to roll. The self-aligning bearing described in this application is a non-standard type. Its inner and outer rings have cross-sections that bulge outwards from the center. All rollers are cylindrical. The inner ring has grooves for axial positioning of the rollers. The outer ring has an arc surface, allowing relative sliding between the outer ring and the rollers, thus achieving self-aligning. Furthermore, radially extending flange steps are provided at both ends of the outer ring near the axial direction to facilitate subsequent bearing installation. During the production process, bearings often require various tests, such as axial clearance, radial clearance, and runout, to ensure that all values ​​are within a reasonable range. This bearing also requires measurement of frictional torque under off-center load. This test involves applying an eccentric load to the test shaft while it rotates, and then using a sensor to measure the frictional torque to ensure the bearing meets various standards during use. Existing measuring devices for this type of bearing are prone to instability due to its strong self-aligning capability, and the operation is complex. Therefore, specific improvements are needed. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a fixture for measuring the friction torque of self-aligning roller bearings under off-center loading conditions. It is simple to operate and provides stable measurements.

[0004] To achieve the above objectives, the present invention provides a fixture for measuring the friction torque of a self-aligning roller bearing under eccentric loading, comprising a motor, a sensor, and a test shaft. The test shaft passes through the inner ring of the bearing to be tested, and a spline is provided at one end of the test shaft. The motor and the sensor are sequentially connected to the spline. The fixture also includes a mounting base and a limiting base. The mounting base is assembled and can be used to clamp the outer ring of the bearing to be tested. An extension is rotatably provided at the other end of the test shaft. The end of the extension is used to connect a load-applying component, and the extension is slidably connected to the limiting base, forming an anti-rotation fit with the limiting base.

[0005] The advantages of the above technical solution are as follows: By setting a test shaft, mounting base, and limiting seat, the outer ring of the bearing to be tested is clamped in the mounting base formed by assembly. The bearing to be tested can be placed and removed by assembling and separating the mounting base. A spline is provided at one end of the test shaft, which is connected to a motor. The motor drives the rotation of the test shaft, which in turn drives the inner ring of the bearing to be tested to rotate. An extension with a rotatable connection is provided at the other end of the test shaft, which slides on the limiting seat. The extension and the limiting seat are anti-rotationally fitted. Finally, a loading component for forming an off-center load on the test shaft is connected to the end of the extension. The test shaft drives the inner ring of the bearing to be tested to rotate. During the process, the extension will not rotate due to its own rotational engagement with the test shaft and its anti-rotation engagement with the limit seat, ensuring a relatively stable state. After placing the loading component at the end of the extension, the extension will slide on the limit seat to a certain extent, and then transmit the torque to the inner ring of the bearing under test through the test shaft, forming a friction torque measurement under the off-center load condition of the non-standard self-aligning roller bearing. The inner ring of the bearing under test is installed on the test shaft through the spline part, and then the mounting base is assembled to form the positioning of the outer ring of the bearing under test. Then the motor can be started to begin the measurement. The operation is simple, and the rotational connection of the extension to connect the loading component ensures the stability of the measurement.

[0006] The present invention can be further configured such that: the mounting base includes a seat and a retaining ring, the seat has an annular groove with a sidewall on one side of the axial direction, the annular groove is for the outer ring of the bearing to be tested to be fitted into it and the sidewall of the annular groove forms an axial abutment with it, and the retaining ring is fastened to the other side of the annular groove by bolts and abuts with the bearing to be tested.

[0007] By further configuring the mounting base, it is designed to include a seat and a retaining ring. The seat has an annular groove with a sidewall on one side. The outer ring of the bearing to be tested is fitted into the annular groove and abuts against the sidewall. Then, the retaining ring is fastened to the other side of the annular groove by bolts, abutting against the outer ring of the bearing to be tested. This allows the sidewall and the retaining ring to clamp and position the outer ring of the bearing to be tested, thus completing the positioning of the outer ring of the bearing to be tested.

[0008] The present invention can be further configured such that: the retaining ring includes a protrusion that fits into the inner circumferential wall of the ring groove, and the protrusion is provided with an elastic abutment layer for contacting the outer ring of the bearing to be tested.

[0009] By further designing the retaining ring, a protrusion is provided on the retaining ring, and an elastic abutment layer is provided on the protrusion. The deformation of the elastic abutment layer increases the clamping force on the outer ring of the bearing under test while avoiding damage to the outer ring of the bearing under test.

[0010] The present invention can be further configured such that: the limiting seat is provided with a long groove and a slider that can slide along the long groove, and the extension is inserted into the slider.

[0011] By further designing the limit seat, a long groove and a slider that can slide along the long groove are provided on the limit seat, allowing the extension to be inserted into the slider to form an anti-rotation fit between the extension and the limit seat, and the extension is driven to slide on the limit seat by the guide sliding fit between the slider and the long groove.

[0012] The present invention can be further configured such that: the long groove extends laterally, a guide rod is provided at one end of the limiting seat facing away from the mounting seat, a steel wire harness is connected to the end of the extension, and the steel wire harness is connected to the loading member after passing above the guide rod.

[0013] By further configuring the long groove to extend laterally, errors are avoided in the test shaft due to the gravity of the slider. A guide rod is set at one end of the mounting base, allowing the steel wire bundle for traction loading at the end of the extension to pass above the guide rod, and the guide rod is used to adjust the direction of force.

[0014] The present invention can be further configured as follows: the slider includes a main body and a telescopic part, the main body is provided with a guide groove, the telescopic part can slide along the guide groove, the extension part includes a first section and a second section, the first section is fixed on the telescopic part to form an anti-rotation fit between the extension part and the slider, the first section and the second section are screwed together, and the second section is rotatably passed through the main body, and the steel wire harness is connected to the second section.

[0015] By further designing the slider, a main body with guide grooves and a telescopic part are provided, allowing the telescopic part to slide along the guide grooves. The extension is divided into a first section and a second section. The first section is fixed to the telescopic part to form an anti-rotation fit between the extension and the slider. The first and second sections are then screwed together. Finally, the second section is rotated and inserted into the main body. When the operator rotates the second section, the first section will slide along the guide groove of the main body together with the telescopic part due to the screwed fit between the first and second sections. At this time, the test shaft will also push the inner ring of the bearing under test to move axially, causing the positions of the inner and outer rings of the bearing under test to change axially, thus providing variables for the test.

[0016] The present invention can be further configured such that: a first retaining ring and a second retaining ring are provided on the test shaft; the first retaining ring is provided at one end of the test shaft corresponding to the bearing under test facing the limiting seat; the first retaining ring is formed by extending from the test shaft; the second retaining ring is provided at the other end of the test shaft and is detachably connected to the test shaft; the first retaining ring and the second retaining ring respectively abut against both ends of the inner ring of the bearing under test in the axial direction.

[0017] By further configuring the test shaft, a first retaining ring and a second retaining ring are installed. The first retaining ring is positioned at the end of the test shaft corresponding to the bearing under test facing the limiting seat, and this first retaining ring is fixed to the test shaft. The second retaining ring is detachably connected to the test shaft. This allows the inner ring of the bearing under test to first abut against the first retaining ring fixed to the test shaft during installation. Then, the second retaining ring is installed on the test shaft to abut against both ends of the bearing under test, thereby positioning the inner ring of the bearing under test.

[0018] The present invention can be further configured such that: a screw hole is provided on the test shaft, and the second retaining ring is composed of two symmetrically arranged semi-ring parts, and bolts that can be used to position the two semi-ring parts through the screw hole are provided on the two semi-ring parts.

[0019] By further configuring the test shaft, a screw hole is made, and the second retaining ring is configured to consist of two symmetrical semi-ring parts. Finally, the two semi-ring parts and the screw hole are bolted through to form the positioning of the second retaining ring, which facilitates the installation of the inner ring of the bearing to be tested. Attached Figure Description

[0020] Figure 1 This is a structural illustration of an embodiment of the present invention. Figure 1 ;

[0021] Figure 2 This is a structural illustration of an embodiment of the present invention. Figure 2 ;

[0022] Figure 3 This is a top view of an embodiment of the present invention;

[0023] Figure 4 This is an embodiment of the present invention. Figure 3 Sectional view at point AA;

[0024] Figure 5 This is an embodiment of the present invention. Figure 4 An enlarged view of part a;

[0025] Figure 6 This is a schematic diagram illustrating the fit between the seat and the bearing under test in an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the test shaft and slider in an embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of the structure of the test shaft in an embodiment of the present invention;

[0028] The components include: mounting base 1; seat 11; annular groove 111; side wall 112; retaining ring 12; protrusion 121; elastic abutment layer 122; limiting seat 2; long groove 21; slider 22; telescopic part 221; guide groove 222; guide rod 23; loading element 3; steel wire harness 31; test shaft 5; spline part 51; extension part 52; first section part 521; second section part 522; first retaining ring 55; second retaining ring 56; bearing to be tested 6; inner ring of bearing to be tested 61; outer ring of bearing to be tested 62. Detailed Implementation

[0029] An example of an embodiment of the friction torque measuring fixture for self-aligning roller bearings under eccentric loading conditions according to the present invention. Figure 1-8 As shown: It includes a mounting base 1, a limiting seat 2, a motor, a sensor, and a test shaft 5. The test shaft 5 passes through the inner ring 61 of the bearing to be tested. A spline portion 51 is provided at one end of the test shaft 5. The motor and the sensor are sequentially connected to the spline portion 51. The mounting base 1 is assembled and can be used to fit the outer ring 62 of the bearing to be tested. An extension portion 52 is rotatably provided at the other end of the test shaft 5. The end of the extension portion 52 is used to connect to the loading member 3 for applying load, and the extension portion 52 is slidably connected to the limiting seat 2 and forms an anti-rotation fit with the limiting seat 2.

[0030] The mounting base 1 includes a seat portion 11 and a retaining ring 12. The seat portion 11 is provided with an annular groove 111 with a side wall 112 on one side of the axial direction. The annular groove 111 allows the outer ring 62 of the bearing to be tested to be fitted into it and forms an axial abutment with it through its side wall 112. The retaining ring 12 is fastened to the other side of the annular groove by bolts and abuts against the bearing 6 to be tested.

[0031] The retaining ring 12 includes a protrusion 121 that fits into the inner circumferential wall of the annular groove 111, and the protrusion 121 is provided with an elastic abutment layer 122 for contacting the outer ring 62 of the bearing to be tested.

[0032] The limiting seat 2 is provided with a long groove 21 and a slider 22 that can slide along the long groove, and the extension 52 is inserted into the slider 22.

[0033] The long groove 21 extends laterally, and a guide rod 23 is provided at one end of the limiting seat 2 facing away from the mounting seat 1. A steel wire bundle 31 is connected to the end of the extension 52, and the steel wire bundle 31 is connected to the loading member 3 after passing above the guide rod.

[0034] The slider 22 includes a main body and a telescopic part 221. The main body is provided with a guide groove 222. The telescopic part 221 can slide along the guide groove 222. The extension part 52 includes a first section 521 and a second section 522. The first section 521 is fixed on the telescopic part 221 to form an anti-rotation fit between the extension part 52 and the slider 22. The first section 521 and the second section 522 are screwed together, and the second section 522 is rotatably passed through the main body. The steel wire bundle 31 is connected to the second section 522.

[0035] The test shaft 5 is provided with a first retaining ring 55 and a second retaining ring 56. The first retaining ring 55 is located at one end of the test shaft 5 corresponding to the bearing 6 under test facing the limiting seat 2. The first retaining ring 55 is extended from the test shaft 5. The second retaining ring 56 is located at the other end of the test shaft 5 and is detachably connected to the test shaft 5. The first retaining ring 55 and the second retaining ring 56 respectively abut against the two ends of the inner ring 61 of the bearing under test in the axial direction.

[0036] The test shaft 5 is provided with a screw hole, and the second retaining ring 56 is composed of two symmetrically arranged semi-ring parts, and the two semi-ring parts are provided with bolts that can be positioned by the screw hole.

[0037] The outer diameter of the spline portion 51 is less than or equal to the outer diameter of the test shaft. Setting the outer diameter of the spline portion 51 to be less than or equal to the outer diameter of the test shaft 5 makes it easier to install the bearing 5 to be tested into the test shaft from the spline portion.

[0038] The above examples are merely one preferred embodiment of the present invention. Ordinary variations and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are all included within the protection scope of the present invention.

Claims

1. A fixture for measuring the frictional torque of a self-aligning roller bearing under eccentric loading, comprising a motor, a sensor, and a test shaft, wherein the test shaft passes through the inner ring of the bearing to be tested, and a spline is provided at one end of the test shaft, and the motor and the sensor are sequentially connected to the spline, characterized in that: The test shaft includes a mounting base and a limiting seat. The mounting base is assembled and can accommodate the outer ring of the bearing under test. An extension is rotatably provided at the other end of the test shaft. The end of the extension is used to connect a load-applying component, and the extension is slidably connected to the limiting seat, forming an anti-rotation fit with the limiting seat. The mounting base includes a seat portion and a retaining ring. The seat portion has an annular groove with a sidewall on one axial side, into which the outer ring of the bearing under test is fitted and forms an axial abutment with it via its sidewall. The retaining ring is bolted to the other side of the annular groove and abuts against the bearing under test. The retaining ring includes a protrusion that fits into the inner circumferential wall of the annular groove, and the protrusion has an elastic abutment for contacting the outer ring of the bearing under test. The connecting layer includes a limiting seat with a long groove and a slider that can slide along the long groove. The extension is inserted into the slider. The long groove extends laterally. A guide rod is provided at the end of the limiting seat facing away from the mounting seat. A steel wire bundle is connected to the end of the extension. The steel wire bundle is connected to the loading component after passing above the guide rod. The slider includes a main body and a telescopic part. A guide groove is provided on the main body. The telescopic part can slide along the guide groove. The extension includes a first section and a second section. The first section is fixed on the telescopic part to form an anti-rotation fit between the extension and the slider. The first section and the second section are screwed together, and the second section is rotatably inserted into the main body. The steel wire bundle is connected to the second section.

2. The fixture for measuring friction torque under eccentric load conditions of self-aligning roller bearings according to claim 1, characterized in that: The test shaft is provided with a first retaining ring and a second retaining ring. The first retaining ring is located at one end of the test shaft corresponding to the bearing under test facing the limiting seat. The first retaining ring is formed by extending from the test shaft. The second retaining ring is located at the other end of the test shaft and is detachably connected to the test shaft. The first retaining ring and the second retaining ring respectively abut against the two ends of the inner ring of the bearing under test in the axial direction.

3. The fixture for measuring the friction torque of a self-aligning roller bearing under eccentric loading as described in claim 2, characterized in that: The test shaft is provided with a screw hole, and the second retaining ring is composed of two symmetrically arranged semi-ring parts, and the two semi-ring parts are provided with bolts that can be positioned by the screw hole.

Images