A vibration measuring fixture for axial loading of the inner ring of a NUP structure cylindrical roller bearing

Abstract

This invention relates to the field of bearing vibration measurement technology, and proposes a vibration measurement fixture for the axial loading of the inner ring of an NUP structure cylindrical roller bearing. The fixture includes a base shaft, a pressure cap, a first bearing, a second bearing, a locking washer, a vibration measurement base, an outer ring limiting component, and an adjusting component. In this invention, during vibration testing of the inner ring of the NUP structure cylindrical roller bearing, the inner ring top sleeve of the fixture can be tightly fitted against the inner ring of the NUP structure cylindrical roller bearing, and the outer ring of the NUP structure cylindrical roller bearing can be limited by the outer ring top sleeve. This prevents misalignment between the outer and inner rings while the NUP structure cylindrical roller bearing rotates at high speed with the drive shaft. Simultaneously, by fixing the inner ring of the NUP structure cylindrical roller bearing, the machining dimensions of the inner ring flange can be tested to ensure they are within the standard range. This effectively solves the problems of misalignment between the outer and inner rings and the inability to identify incomplete machining dimensions of the inner ring flange during testing of cylindrical roller bearings in the prior art.

Description

Technical Field

[0001] This invention relates to the field of bearing vibration measurement technology, specifically to a tooling for axial loading vibration measurement of the inner ring of a NUP structure cylindrical roller bearing. Background Technology

[0002] When testing a rolling bearing, the inner ring of the bearing rotates at a constant speed while the outer ring remains stationary. The sensor contacts the outer ring and vibrates along with it. The sensor converts the acquired mechanical signal into an electronic signal and transmits it to an electronic measuring instrument. After processing, the electronic measuring instrument displays the vibration value (RMS value, peak value) on the meter, the vibration waveform on the oscilloscope, and the vibration noise through a speaker.

[0003] For example, a bearing vibration measuring device disclosed in application number 201921754103.1 has a drive mechanism and a detection platform installed on the rear and front sides of the base, respectively. The detection platform on the base has a shaft hole below it, and a vibration measuring mandrel is inserted into the shaft hole. A vibration sensor is installed at the through hole position of the detection platform. The drive mechanism is connected to one end of the vibration measuring mandrel, and a conical shaft is set at the other end of the vibration measuring mandrel. The bearing under test is sleeved on the conical shaft. The vibration sensor is located above the conical shaft, and a vibration transmission rod is installed at the sensing end of the vibration sensor. The end of the vibration transmission rod abuts against the middle part of the outer side wall of the outer ring of the bearing under test, and the push mechanism abuts against the end face of the outer ring of the bearing under test. The bearing vibration is tested by using the conical shaft on the vibration measuring mandrel to further detect whether the bearing emits noise during actual operation. It can also measure the quality condition of the bottom of the ring groove and the quality condition of the side of the ring groove, avoiding the situation where the product generates noise and is complained about by the customer after installation.

[0004] When testing NUP (Non-Upper Plate) cylindrical roller bearings (cylindrical roller bearings with a single inner ring flange and a flat retainer ring), the bearings with a single inner ring flange primarily bear radial loads. Vibration velocity testing simulates bearing operating conditions by radially loading the bearing races. However, the aforementioned bearing vibration testing devices and existing technologies all use a fixed outer ring. During batch testing, because the inner and outer rings are separable, misalignment can occur when the entire bearing assembly is mounted on a high-speed rotating shaft, causing the inner ring to easily detach from the outer ring. Furthermore, the inner ring flange of the cylindrical roller bearing is prone to dimensional inaccuracies during machining. Existing vibration testing methods can only test the vibration of the outer ring and cannot detect this anomaly. Additionally, axial loading of the outer ring can cause the roller ends to rub against the inner and outer ring flanges, affecting the vibration measurement results. Summary of the Invention

[0005] The purpose of this invention is to provide an axial loading fixture that can prevent the inner and outer rings of a bearing from separating without affecting the rotation of the rolling elements.

[0006] The technical solution of the present invention is as follows: A vibration measuring fixture for axial loading of the inner ring of an NUP structure cylindrical roller bearing includes a base shaft, a pressure cap, a first bearing, a second bearing, a locking washer, a vibration measuring base, an outer ring limiting component, and an adjusting component. The vibration measuring base is fixed to the loading shaft end of the axial loading device. The locking washer is fixed to the bottom end of the base shaft by bolts and axially assembled inside the vibration measuring base. The pressure cap is sleeved on the outside of the base shaft and clamped between the base shaft and the vibration measuring base. The base shaft is rotatably connected to the pressure cap through the first bearing. The base shaft is rotatably connected to the vibration measuring base through the second bearing. The outer ring limiting component is disposed on the outside of the base shaft. The adjusting component is sleeved on the outside of the base shaft and clamped between the base shaft and the outer ring limiting component.

[0007] Preferably, the base shaft includes an inner ring top sleeve, the bottom of which is provided with an outwardly protruding circular protrusion, and the top surface of the protrusion is fixedly connected to an inner cylinder.

[0008] Preferably, the outer ring limiting component includes an outer ring top sleeve, which is slidably sleeved on the outside of the inner ring top sleeve. A fixing plate is fixedly connected to the bottom of the outer ring top sleeve. The inner cylinder is slidably sleeved on the inside of the fixing plate and the outer ring top sleeve. The outer ring top sleeve and the inner ring top sleeve are elastically connected by an elastic element.

[0009] Preferably, the elastic element includes a spring, the top end of which is fixedly connected to the outer ring top sleeve, and the bottom end of which is fixedly connected to the protruding foot at the bottom of the inner ring top sleeve.

[0010] Preferably, the adjusting component includes two symmetrically arranged first widening shims and second widening shims, which are clamped on the outside of the inner tube.

[0011] Preferably, the protruding foot has a first tightening screw hole, the fixed plate has a second tightening screw hole, and the first widened washer and the second widened washer have a third tightening screw hole corresponding to the first tightening screw hole and the second tightening screw hole.

[0012] Preferably, the vibration measuring base has an axial positioning hole at its center that coincides with the axial direction of the vibration measuring base.

[0013] Preferably, the outer circumferential wall of the vibration measuring base is provided with a transverse screw hole perpendicular to the axial direction of the vibration measuring base.

[0014] Preferably, the top surface of the vibration measuring base is provided with a second longitudinal screw hole parallel to the axial direction of the vibration measuring base, and the pressure cover is provided with a first longitudinal screw hole corresponding to the second longitudinal screw hole.

[0015] Preferably, the locking washer has an axial hole at its center that coincides with the axial direction of the locking washer, and the bottom surface of the base shaft has an axial screw hole corresponding to the axial hole.

[0016] The working principle and beneficial effects of this invention are as follows:

[0017] 1. In the testing of NUP structure cylindrical roller bearings, during vibration testing of the inner ring of the NUP structure cylindrical roller bearing, the inner ring top sleeve of the tooling can be tightly fitted against the inner ring of the NUP structure cylindrical roller bearing, and the outer ring of the NUP structure cylindrical roller bearing can be limited by the outer ring top sleeve. This prevents the outer ring of the NUP structure cylindrical roller bearing from detaching from the inner ring while the NUP structure cylindrical roller bearing rotates at high speed with the drive shaft, thus avoiding misalignment between the outer ring and the inner ring. At the same time, by fixing the inner ring of the NUP structure cylindrical roller bearing, it is possible to test whether the machining dimensions of the inner ring flange are within the standard range and detect whether there are any machining abnormalities. This effectively solves the problems of misalignment between the outer ring and the inner ring and the inability to identify the machining dimensions of the inner ring flange that are not properly machined in the prior art when testing cylindrical roller bearings.

[0018] 2. In this invention, during vibration testing of the outer ring of the NUP structure cylindrical roller bearing, the outer ring top sleeve of the tooling can be tightly fitted against the outer ring of the NUP structure cylindrical roller bearing, and the inner ring of the NUP structure cylindrical roller bearing can be limited by the inner ring top sleeve. This prevents the outer ring and inner ring from misaligning while the NUP structure cylindrical roller bearing rotates at high speed with the drive shaft, thereby preventing the inner ring of the NUP structure cylindrical roller bearing from detaching from the outer ring. At the same time, this method of fixing the outer ring of the NUP structure cylindrical roller bearing reduces the contact friction between the two ends of the roller and the inner and outer ring retaining edges, reducing the impact on the vibration measurement results. This effectively solves the problem in the prior art that the two ends of the roller easily contact and rub against the inner and outer ring retaining edges during cylindrical roller bearing testing. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] Figure 1 This is a schematic diagram of an axial loading vibration measuring fixture for the inner ring of a cylindrical roller bearing with an NUP structure, as proposed in this invention.

[0021] Figure 2 This is a schematic cross-sectional view of a vibration measuring fixture for axial loading of the inner ring of a cylindrical roller bearing with an NUP structure, as proposed in this invention.

[0022] Figure 3 This is an exploded structural diagram of an axial loading vibration measuring fixture for the inner ring of a cylindrical roller bearing with an NUP structure proposed in this invention.

[0023] Figure 4 This is an exploded structural diagram of the NUP structure cylindrical roller bearing inner ring axial loading vibration measuring tool proposed in this invention from another perspective.

[0024] Figure 5 The present invention proposes Figure 2 Enlarged structural diagram at point A in the middle;

[0025] Figure 6 This is a schematic diagram of the first widened gasket and the second widened gasket proposed in this invention;

[0026] In the diagram: 1. Base shaft; 11. Inner ring top sleeve; 12. Protruding foot; 121. First shaft tightening screw hole; 13. Axial screw hole; 14. Inner cylinder; 2. Pressure cap; 21. First longitudinal screw hole; 3. First bearing; 4. Second bearing; 5. Locking washer; 51. Axial hole; 6. Vibration measuring base; 61. Transverse screw hole; 62. Axial positioning hole; 63. Second longitudinal screw hole; 7. Outer ring limiting component; 71. Outer ring top sleeve; 72. Fixing plate; 73. Spring; 74. Second shaft tightening screw hole; 8. Adjustment component; 81. First widened washer; 82. Second widened washer; 83. Third shaft tightening screw hole. Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4This invention provides a technical solution: an axial loading vibration measuring fixture for the inner ring of an NUP structure cylindrical roller bearing, comprising a base shaft 1, a pressure cap 2, a first bearing 3, a second bearing 4, a locking washer 5, a vibration measuring base 6, an outer ring limiting component 7, and an adjusting component 8. The vibration measuring base 6 is fixed to the loading shaft end of the axial loading device. The locking washer 5 is fixed to the bottom end of the base shaft 1 by bolts and axially assembled inside the vibration measuring base 6. The base shaft 1 includes an inner ring top sleeve 11, and the bottom of the inner ring top sleeve 11 is provided with a... The protruding circular foot 12 has an inner cylinder 14 fixedly connected to its top surface. When the inner ring top sleeve 11 presses against the inner ring of the NUP structure cylindrical roller bearing being tested, it can fix the inner ring of the NUP structure cylindrical roller bearing. At the same time, the outer ring limiting component 7 limits the outer ring of the NUP structure cylindrical roller bearing, so that the NUP structure cylindrical roller bearing can limit the misalignment between the outer ring and the inner ring while rotating at high speed with the drive shaft, thereby preventing the outer ring of the NUP structure cylindrical roller bearing from detaching from the inner ring.

[0029] Please see Figure 2 and Figure 5 The pressure cap 2 is sleeved on the outside of the base shaft 1 and clamped between the base shaft 1 and the vibration measuring base 6. The base shaft 1 is rotatably connected to the pressure cap 2 through the first bearing 3 and to the vibration measuring base 6 through the second bearing 4. The outer ring limiting component 7 is set on the outside of the base shaft 1. The outer ring limiting component 7 includes an outer ring top sleeve 71, which is slidably sleeved on the outside of the inner ring top sleeve 11. A fixed plate 72 is fixedly connected to the bottom of the outer ring top sleeve 71. The inner cylinder 14 is slidably sleeved on the inside of the fixed plate 72 and the outer ring top sleeve 71. The outer ring top sleeve 71 and the inner ring top sleeve 11 are elastically connected by an elastic element, which includes a spring 73. The top end of the spring 73 is fixedly connected to the outer ring top sleeve 71, and the bottom end of the spring 73 is fixedly connected to the protrusion 12 at the bottom of the inner ring top sleeve 11 to ensure the limiting ability of the outer ring top sleeve 71 on the outer ring of the NUP structure cylindrical roller bearing.

[0030] Please see Figure 6 The adjusting component 8 is sleeved on the outside of the base shaft 1 and clamped between the base shaft 1 and the outer ring limiting component 7. The adjusting component 8 includes two symmetrically arranged first widening shims 81 and second widening shims 82. The first widening shims 81 and second widening shims 82 are clamped on the outside of the inner cylinder 14. The thickness of the first widening shims 81 and second widening shims 82 is the same. According to specific testing requirements, a certain number of first widening shims 81 and second widening shims 82 can be selected and clamped between the base shaft 1 and the outer ring limiting component 7 to adjust the extension length of the outer ring top sleeve 71 and the inner ring top sleeve 11.

[0031] The protruding foot 12 has a first axial tightening screw hole 121, and the fixed plate 72 has a second axial tightening screw hole 74. The first widened washer 81 and the second widened washer 82 have third axial tightening screw holes 83 corresponding to the first axial tightening screw hole 121 and the second axial tightening screw hole 74. The center of the vibration measuring base 6 has an axial positioning hole 62 that coincides with the axial direction of the vibration measuring base 6. The axial positioning hole 62 of the vibration measuring base 6 can be installed on the loading shaft end of the axial loading device. The outer circumferential wall of the vibration measuring base 6 has a transverse screw hole 61 that is perpendicular to the axial direction of the vibration measuring base 6. Bolts can be passed through the transverse screw hole 61 that is perpendicular to the axial direction of the loading shaft and fixed to the shaft, so that the vibration measuring base 6 is fixed to the shaft. The top surface of the vibration measuring base 6 is provided with a second longitudinal screw hole 63 parallel to the axial direction of the vibration measuring base 6. The pressure cover 2 is provided with a first longitudinal screw hole 21 corresponding to the second longitudinal screw hole 63. The pressure cover 2 can be fixed by passing a bolt through the first longitudinal screw hole 21 on the pressure cover 2 and the second longitudinal screw hole 63 on the vibration measuring base 6, so that the pressure cover 2 is installed on the vibration measuring base 6. The center position of the locking washer 5 is provided with an axial hole 51 that coincides with the axial direction of the locking washer 5. The bottom surface of the base shaft 1 is provided with an axial screw hole 13 corresponding to the axial hole 51. The locking washer 5 can be fixed to the bottom surface of the base shaft 1 by passing a bolt through the axial hole 51 and the axial screw hole 13.

[0032] The working principle and usage process of this invention: There are two testing methods for NUP structure cylindrical roller bearings. The first method is the vibration test of the inner ring of the NUP structure cylindrical roller bearing. During the test, the axial positioning hole 62 of the vibration measuring base 6 is first installed on the loading shaft end of the axial loading device, and then fixed by bolts through the transverse threaded hole 61 perpendicular to the axial direction of the loading shaft. Then, the locking washer 5 is installed on the bottom of the base shaft 1 and fixed by bolts through the axial hole 51 and the axial threaded hole 13. A smaller number of the first widened shims 81 and the second widened shims 82 are clamped between the fixing plate 72 and the protrusion 12, and then fixed by bolts passing through the first axial tightening screw hole 121 on the protrusion 12, the third axial tightening screw hole 83 on the first widened shims 81 and the second widened shims 82, and the second axial tightening screw hole 74 on the fixing plate 72. (The number of first widened shims 81 and second widened shims 82 assembled must ensure that the extension length of the inner ring top sleeve 11 is greater than the extension length of the outer ring top sleeve 71, and the inner ring top sleeve...) When the outer ring top sleeve 71 contacts the inner ring of the NUP structure cylindrical roller bearing to be tested, it will not contact the outer ring of the NUP structure cylindrical roller bearing. The assembly of the NUP structure cylindrical roller bearing inner ring loading test fixture is completed by bolting through the first longitudinal screw hole 21 on the pressure cover 2 and the second longitudinal screw hole 63 on the vibration measuring base 6. Then, the NUP structure cylindrical roller bearing to be tested can be assembled on the drive shaft end of the rolling bearing vibration tester. The inner ring top sleeve 11 of the fixture is pressed against the inner ring of the NUP structure cylindrical roller bearing. The outer ring of the NUP structure cylindrical roller bearing can be limited by the outer ring top sleeve 71, so that the NUP structure cylindrical roller bearing is limited to the misalignment of the outer ring and the inner ring while rotating at high speed with the drive shaft, thereby preventing the outer ring of the NUP structure cylindrical roller bearing from detaching from the inner ring. At the same time, by fixing the inner ring of the NUP structure cylindrical roller bearing, it is possible to test whether the machining dimensions of the inner ring flange of the cylindrical roller bearing are within the standard range and detect whether there is any machining abnormality.

[0033] The second method involves vibration testing of the outer ring of a NUP structure cylindrical roller bearing. During testing, the axial positioning hole 62 of the vibration measuring base 6 is first installed on the loading shaft end of the axial loading device. Bolts are then passed through the transverse threaded hole 61 perpendicular to the loading shaft axis and fixed. Next, locking washers 5 are installed on the bottom of the base shaft 1 and fixed by bolts passing through the axial hole 51 and axial threaded hole 13. A large number of first widened washers 81 and second widened washers 82 are clamped between the fixed plate 72 and the protrusion 12. Bolts are then passed through the first axial tightening threaded hole 121 on the protrusion 12, the third axial tightening threaded hole 83 on the first widened washers 81 and second widened washers 82, and the second axial tightening threaded hole 74 on the fixed plate 72 for fixation. (The number of first widened washers 81 and second widened washers 82 assembled must ensure that the extension length of the inner ring top sleeve 11 is less than the extension length of the outer ring top sleeve 71, and that the outer ring top sleeve 71 is aligned with the NUP structure cylindrical roller bearing to be tested.) When the outer ring contacts the inner ring, the inner ring top sleeve 11 will not contact the inner ring of the NUP structure cylindrical roller bearing. The assembly of the NUP structure cylindrical roller bearing inner ring loading test fixture is completed by bolting through the first longitudinal screw hole 21 on the pressure cover 2 and the second longitudinal screw hole 63 on the vibration measuring base 6. Then, the NUP structure cylindrical roller bearing to be tested can be assembled on the drive shaft end of the rolling bearing vibration tester. The outer ring top sleeve 71 of the fixture is tightened against the outer ring of the NUP structure cylindrical roller bearing. The inner ring of the NUP structure cylindrical roller bearing can be limited by the inner ring top sleeve 11, so that the NUP structure cylindrical roller bearing can be restricted from misalignment between the outer ring and the inner ring while rotating at high speed with the drive shaft. This prevents the inner ring of the NUP structure cylindrical roller bearing from detaching from the outer ring. At the same time, this method of fixing the outer ring of the NUP structure cylindrical roller bearing can reduce the contact friction between the two ends of the roller and the inner and outer ring flanges, and reduce the impact on the vibration measurement results.

[0034] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A vibration measuring fixture for axial loading of the inner ring of a NUP structure cylindrical roller bearing, characterized in that, The device includes a base shaft (1), a pressure cap (2), a first bearing (3), a second bearing (4), a locking washer (5), a vibration measuring base (6), an outer ring limiting component (7), and an adjusting component (8). The vibration measuring base (6) is fixed to the loading shaft end of the axial loading device. The locking washer (5) is fixed to the bottom end of the base shaft (1) by bolts and axially assembled inside the vibration measuring base (6). The pressure cap (2) is sleeved on the outside of the base shaft (1) and clamped between the base shaft (1) and the vibration measuring base (6). The base shaft (1) is rotatably connected to the pressure cap (2) through the first bearing (3). The base shaft (1) is rotatably connected to the vibration measuring base (6) through the second bearing (4). The outer ring limiting component (7) is located on the outside of the base shaft (1). The adjusting component (8) is sleeved on the outside of the base shaft (1) and clamped between the base shaft (1) and the outer ring limiting component (6). 7) Between; the base shaft (1) includes an inner ring top sleeve (11), the bottom of the inner ring top sleeve (11) is provided with an outwardly protruding circular protrusion (12), the top surface of the protrusion (12) is fixedly connected to an inner tube (14); the outer ring limiting component (7) includes an outer ring top sleeve (71), the outer ring top sleeve (71) is slidably sleeved on the outside of the inner ring top sleeve (11), the bottom of the outer ring top sleeve (71) is fixedly connected to a fixing plate (72), the inner tube (14) is slidably sleeved on the inside of the fixing plate (72) and the outer ring top sleeve (71), the outer ring top sleeve (71) and the inner ring top sleeve (11) are elastically connected by an elastic element; the adjusting component (8) includes two symmetrically arranged first widening pads (81) and second widening pads (82), the first widening pads (81) and the second widening pads (82) are clamped on the outside of the inner tube (14).

2. The axial loading vibration measuring fixture for the inner ring of an NUP structure cylindrical roller bearing according to claim 1, characterized in that, The elastic element includes a spring (73), the top end of which is fixedly connected to the outer ring top sleeve (71), and the bottom end of which is fixedly connected to the protruding foot (12) at the bottom of the inner ring top sleeve (11).

3. The axial loading vibration measuring fixture for the inner ring of an NUP structure cylindrical roller bearing according to claim 1, characterized in that, The protruding foot (12) is provided with a first tightening screw hole (121), the fixed plate (72) is provided with a second tightening screw hole (74), and the first widened washer (81) and the second widened washer (82) are provided with a third tightening screw hole (83) corresponding to the first tightening screw hole (121) and the second tightening screw hole (74).

4. The axial loading vibration measuring fixture for the inner ring of an NUP structure cylindrical roller bearing according to claim 1, characterized in that, The vibration measuring base (6) has an axial positioning hole (62) at its center that coincides with the axial direction of the vibration measuring base (6).

5. The axial loading vibration measuring fixture for the inner ring of an NUP structure cylindrical roller bearing according to claim 1, characterized in that, The vibration measuring base (6) has a transverse screw hole (61) on its outer circumference wall that is perpendicular to the axial direction of the vibration measuring base (6).

6. The axial loading vibration measuring fixture for the inner ring of an NUP structure cylindrical roller bearing according to claim 1, characterized in that, The top surface of the vibration measuring base (6) is provided with a second longitudinal screw hole (63) parallel to the axial direction of the vibration measuring base (6), and the pressure cover (2) is provided with a first longitudinal screw hole (21) corresponding to the second longitudinal screw hole (63).

7. The axial loading vibration measuring fixture for the inner ring of an NUP structure cylindrical roller bearing according to claim 1, characterized in that, The locking washer (5) has an axial hole (51) at its center that coincides with the axial direction of the locking washer (5), and the bottom surface of the base shaft (1) has an axial screw hole (13) corresponding to the axial hole (51).

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