Device for measuring starting torque of thrust bearing in loading state

Abstract

A thrust bearing loading state starting torque measuring device comprises a workbench, a lower bearing seat, a first test bearing, a test shaft, a second test bearing, an upper bearing seat, a press machine, a screw rod and a force measuring unit. The middle part of the test shaft is provided with a third shaft section protruding out of the outer diameter surface of the test shaft, the first test bearing and the second test bearing are sleeved on the vertically arranged test shaft and are distributed on the upper side and the lower side of the third shaft section, and the upper bearing seat and the lower bearing seat wrap the first test bearing, the second test bearing and the test shaft in a space defined by the upper bearing seat and the lower bearing seat; a long slotted hole is further formed in the outer diameter face of the upper bearing seat, one end of the screw penetrates through the long slotted hole and is connected to the testing shaft, and the other end of the screw is connected with the force measuring unit. The device is convenient to load the test bearings and high in safety, the upper bearing seat adopts a deeper shell structure, and the two sets of test bearings are almost completely wrapped by the two bearing seats, so that operators cannot be hurt even if the bearings are broken due to overlarge load applied in the test process.

Description

Technical Field

[0001] The utility model relates to the technical field of bearing testing equipment, in particular to a thrust bearing loading starting torque measuring device. Background Art

[0002] As we all know, thrust bearings are composed of shaft rings, seat rings, rolling elements and retainers. They are mostly used in equipment such as crane hooks, vertical water pumps and jacks, and bear axial forces during operation. In order to better develop and apply thrust bearings, it is necessary to test the newly developed bearings and measure the starting torque of the thrust bearings under different loads.

[0003] The utility model patent "A device for measuring the friction torque of a thrust bearing" (CN 215178303 U) discloses a device for testing the friction torque of a dynamic pressure air-floating thrust bearing. The device drives the test spindle to rotate through a high-speed motor, and the test spindle drives the thrust plate to rotate. The contact state between the thrust plate and the dynamic pressure air-floating thrust bearing changes from low-speed dry friction to high-speed air suspension. The contact state changes with the change of the high-speed motor speed. The friction torque of the thrust bearing can be directly measured by a dynamic torque sensor.

[0004] The utility model patent "Thrust bearing friction torque calibration device" (CN 211740485 U) provides a thrust bearing friction torque calibration device that can measure the thrust bearing friction torque in a simulated weightless state. The device provides a vertical upward magnetic force to the measured bearing ball through a magnetic ring, thereby overcoming the ball gravity, simulating the weightless state of the bearing, and then measuring the bearing friction torque through the torque measurement shaft.

[0005] The above two technical solutions are to measure the friction torque of the dynamic pressure air-floating thrust bearing under high-speed rotation and to measure the friction torque of the thrust bearing under weightlessness. Neither of them can measure the starting torque of the thrust bearing under a large load. Therefore, it is necessary to design a test device to apply a sufficiently large axial load to the thrust bearing and measure the starting torque of the bearing rotation under load. Utility Model Content

[0006] The utility model aims to provide a device for measuring the loading starting torque of a thrust bearing.

[0007] The technical solution adopted by the utility model is: a thrust bearing loading starting torque measuring device, comprising a workbench, a lower bearing seat, a first test bearing, a test shaft, a second test bearing, an upper bearing seat, a press, a screw and a force measuring unit; the middle part of the test shaft is provided with a third shaft section protruding from its outer diameter surface, the first test bearing and the second test bearing are sleeved on the vertically arranged test shaft and distributed on the upper and lower sides of the third shaft section, the upper bearing seat and the lower bearing seat wrap the first test bearing, the second test bearing and the test shaft in the space enclosed by them, a long slot hole is also provided on the outer diameter surface of the upper bearing seat, one end of the screw passes through the long slot hole and is connected to the test shaft, and the other end is connected to the force measuring unit.

[0008] As a preferred embodiment, the test shaft includes, from bottom to top, the first shaft section, the second shaft section, the third shaft section, the fourth shaft section and the fifth shaft section, the shaft ring of the first test bearing is mounted on the second shaft section facing upward, and the shaft ring of the second test bearing is mounted on the fourth shaft section facing downward; the lower bearing seat is mounted outside the seat ring of the first test bearing, and the upper bearing seat is mounted outside the seat ring of the second test bearing.

[0009] As a preferred solution, two small planes are symmetrically milled on the outer circumferential surface of the third shaft section of the test shaft, the distance between the two small planes is smaller than the outer diameter of the test bearing shaft ring, and a threaded hole for installing a screw is provided on one of the small planes.

[0010] As a preferred solution, the test shaft is also provided with a weight-reducing hole.

[0011] As a preferred solution, the first test bearing and the second test bearing are bearings of the same model.

[0012] As a preferred solution, the lower bearing seat is placed at the center of the plane on the workbench, and the upper bearing seat is located directly below the press.

[0013] As a preferred solution, top screw holes are respectively provided on the end surfaces of the lower bearing seat and the upper bearing seat.

[0014] As a preferred solution, the width of the long slot hole arranged on the upper bearing seat is greater than the diameter of the screw, and the slot length satisfies the rotation angle when measuring the starting torque of the test bearing.

[0015] As a preferred solution, the force measuring unit adopts a spring balance.

[0016] The beneficial effects of the utility model are:

[0017] Based on the defects of the prior art, a thrust bearing loading starting torque measuring device is provided. By optimizing the structural design, the device has the following effects:

[0018] (1) The thrust bearing loading state starting torque measuring device provided by the utility model has a simple structure, low processing difficulty and low manufacturing cost;

[0019] (2) The device is convenient for loading the test bearings. The press only needs to apply the required pressure to the upper bearing seat to make the two sets of test bearings bear equal axial loads.

[0020] (3) The torque measurement method of this device is simple and convenient. The force measuring unit pulls the screw vertically to rotate the test shaft and the test bearing shaft ring. The product of the force measuring unit pulling force and the distance from the force measuring unit to the bearing rotation center is the sum of the starting torques of the two bearings.

[0021] (4) The device is highly safe. The upper bearing seat adopts a deeper shell structure. The two sets of test bearings are almost completely wrapped by the two bearing seats. Even if the load applied during the test is too large and causes the bearing to break, it will not harm the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 Schematic diagram of the three-dimensional structure of the thrust bearing loading starting torque measurement device;

[0024] Figure 2 This is a cross-sectional view of the main structure of the thrust bearing loading starting torque measurement device;

[0025] Figure 3 This is a cross-sectional view of the test axis;

[0026] Figure 4 It is a schematic diagram of the three-dimensional structure of the test shaft;

[0027] Figure 5 Schematic diagram of the three-dimensional structure of the upper bearing seat.

[0028] Reference numerals: 1, workbench; 2, lower bearing seat; 21, top screw hole of lower bearing seat; 3,

[0029] First test bearing; 31. First test bearing seat ring; 32. First test bearing shaft ring; 4. Test shaft; 41. First shaft section; 42. Second shaft section; 43. Third shaft section; 431. Small plane; 44. Fourth shaft section; 45. Fifth shaft section; 46. Lightening hole; 47. Threaded hole; 5. Second test bearing; 51. Second test bearing seat ring; 52. Second test bearing shaft ring; 6. Upper bearing seat; 61. Top screw hole of upper bearing seat; 62. Long slot hole; 7. Press; 8. Screw; 81. Small round hole; 9. Force measuring unit. DETAILED DESCRIPTION

[0030] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that, without further description, elements, structures and features in one embodiment may also be beneficially combined in other embodiments.

[0031] It should be noted that: unless otherwise defined, the technical terms or scientific terms used in this article should be understood by people with ordinary skills in the field to which the utility model belongs. The words "one", "an" or "the" and the like used in the patent application specification and claims of this utility model do not express quantitative restrictions, but indicate the existence of at least one; the "first", "second" and "third" used in this article should not be regarded as restrictions on the order of components, but are only used to distinguish different components; "include" or "comprise" and other similar words indicate that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, but do not exclude other elements or objects with the same function.

[0032] Embodiment 1

[0033] In order to more clearly describe the specific structure and measurement process of the thrust bearing loading starting torque measurement device, combined with the attached Figure 1-5 Describe this embodiment:

[0034] As shown in the figure, a thrust bearing loading starting torque measuring device is composed of a workbench 1, a lower bearing seat 2, a first test bearing 3, a test shaft 4, a second test bearing 5, an upper bearing seat 6, a press 7, a screw 8 and a force measuring unit 9. In this embodiment, the force measuring unit 9 adopts a spring balance.

[0035] In this embodiment, the workbench 1 is located directly below the pressure column of the press 7; the test shaft 4 is placed vertically, and from bottom to top are the first shaft section 41, the second shaft section 42, the third shaft section 43, the fourth shaft section 44 and the fifth shaft section 45, wherein the third shaft section 43 is located in the middle section of the entire test shaft 4, and its outer diameter is larger than the outer diameters of the first shaft section 41, the second shaft section 42, the fourth shaft section 44 and the fifth shaft section 45, the first test bearing shaft ring 32 is upwardly mounted on the second shaft section 42, and the second test bearing shaft ring 52 is downwardly mounted on the fourth shaft section 44; the lower bearing seat 2 is mounted outside the first test bearing seat ring 31, and the upper bearing seat 6 is mounted outside the second test bearing seat ring 51, the lower bearing seat 2 is placed in the center of the plane on the workbench 1, and the upper bearing seat 6 is located directly below the press 7; the threaded end of the screw 8 is installed in the threaded hole 47 of the test shaft 4; the hook of the spring scale 9 is connected to the small round hole 81 of the screw 8.

[0036] In this embodiment, the first test bearing 3 and the second test bearing 5 are bearings of the same model, and the measured starting torque is the sum of the starting torques of the two sets of bearings. The measurement result divided by 2 is the starting torque of a single set of bearings.

[0037] In this embodiment, in order to facilitate the removal of the two sets of test bearings from the test shaft 4, two small planes 431 are symmetrically milled on the outer cylindrical surface of the third shaft section 43 of the test shaft 4, and the distance between the two small planes 431 is smaller than the size of the outer diameter of the test bearing shaft ring; when removing the shaft ring, the shaft ring can be supported from the two small planes 431, and then the test shaft 4 can be pushed from the shaft end to separate the test shaft 4 from the shaft ring.

[0038] In this embodiment, a top screw hole 21 is set on the end face of the lower bearing seat 2, and a top screw hole 61 is set on the end face of the upper bearing seat 6. The top screw holes are evenly distributed about the center circumference of the end face, and there are several top screw holes. The positions of the top screw holes correspond to the test bearing seat ring. With such an arrangement, when disassembling the test bearing seat ring, the test bearing seat ring can be pushed out of the bearing seat through the top screw hole using a top screw.

[0039] In this embodiment, the upper bearing seat 6 is set as a deeper shell structure, so that after all parts are assembled in place, the upper and lower bearing seats almost completely wrap the two test bearings and the test shaft 4, and there is only a narrow gap between the upper and lower bearing seats. The narrow gap not only ensures that the two bearing seats do not contact each other and do not affect the axial load applied to the two sets of test bearings, but also isolates the test bearings from the outside world. Even if the test load is too large and causes the test bearing to break, it will not cause personal injury.

[0040] In this embodiment, in order to facilitate the installation and rotation of the screw 8, a long slot hole 62 is opened on the circumferential surface of the upper bearing seat 6. After all components are installed in place, the position of the long slot hole 62 needs to correspond to the threaded hole 47 of the test shaft 4. The width of the long slot hole 62 is slightly larger than the diameter of the screw 8, and its slot length needs to meet the rotation angle when measuring the starting torque of the test bearing.

[0041] In this embodiment, a weight-reducing hole 46 is provided on the test shaft 4 to reduce the rotational inertia of the test shaft 4 and make the measurement result more accurate.

[0042] The process of measuring the starting torque of the thrust bearing using the device is as follows:

[0043] When in use, first assemble all parts in place, and then the press applies downward pressure F1 to the upper bearing seat 6 through the pressure column 7. At this time, both test bearings are subjected to the axial load F1. Then, the screw 8 is pulled vertically in the horizontal direction through the spring scale 9. Under the action of the tension, the screw 8 drives the test shaft 4, the first test bearing shaft ring 32 and the second test bearing shaft ring 52 to rotate. When the rotation starts, the spring scale tension value F2 is recorded. The distance between the small round hole 81 of the screw and the rotation center of the test bearing is L. Ignoring the rotational inertia of the test shaft 4 and the screw 8, the starting torque M of the two test bearings under the action of the axial load F1 总 = F2× L, the starting torque of a single bearing under this load is M = ½ M 总 =½ F2× L.

[0044] The parts not described in detail in this embodiment are prior art.

[0045] It should be noted that although the utility model is described through the above embodiments, the utility model can also have other multiple embodiments. Without departing from the spirit and scope of the utility model, it is obvious that those skilled in the art can make various corresponding changes and deformations to the utility model, but these changes and deformations should all fall within the scope of protection of the attached claims of the utility model and their equivalents.

Claims

1. A device for measuring starting torque of a thrust bearing under loading condition, characterized in that: It includes a workbench, a lower bearing seat, a first test bearing, a test shaft, a second test bearing, an upper bearing seat, a press, a screw and a force measuring unit; the middle part of the test shaft has a third shaft section protruding from its outer diameter surface, the first test bearing and the second test bearing are mounted on the vertically arranged test shaft and are distributed on the upper and lower sides of the third shaft section, the upper bearing seat and the lower bearing seat wrap the first test bearing, the second test bearing and the test shaft in the space enclosed by them, and a long slot hole is also provided on the outer diameter surface of the upper bearing seat, one end of the screw passes through the long slot hole and is connected to the test shaft, and the other end is connected to the force measuring unit.

2. A thrust bearing loading state starting torque measurement device according to claim 1, characterized in that: The test shaft includes, from bottom to top, the first shaft section, the second shaft section, the third shaft section, the fourth shaft section and the fifth shaft section, respectively; the shaft ring of the first test bearing is mounted on the second shaft section facing upward, and the shaft ring of the second test bearing is mounted on the fourth shaft section facing downward; the lower bearing seat is mounted outside the seat ring of the first test bearing, and the upper bearing seat is mounted outside the seat ring of the second test bearing.

3. A thrust bearing loading state starting torque measurement device according to claim 2, characterized in that: Two small planes are symmetrically milled on the outer circumferential surface of the third shaft section of the test shaft, and the distance between the two small planes is smaller than the size of the outer diameter of the test bearing shaft ring. A threaded hole for installing a screw is provided on one of the small planes.

4. A thrust bearing loading state starting torque measurement device according to claim 2, characterized in that: The test shaft is also provided with a weight-reducing hole.

5. A thrust bearing loading state starting torque measuring device according to claim 1 or 2, characterized in that: The first test bearing and the second test bearing are bearings of the same model.

6. The device for measuring starting torque of a thrust bearing under loading state according to claim 1, characterized in that: The lower bearing seat is placed at the center of the plane on the workbench, and the upper bearing seat is located directly below the press.

7. The device for measuring starting torque of a thrust bearing under loading state according to claim 1, characterized in that: The end surfaces of the lower bearing seat and the upper bearing seat are respectively provided with top screw holes.

8. The device for measuring starting torque of a thrust bearing under loading state according to claim 1, characterized in that: The width of the long slotted hole arranged on the upper bearing seat is greater than the diameter of the screw, and the slotted length satisfies the rotation angle when measuring the starting torque of the test bearing.

9. The device for measuring starting torque of a thrust bearing under loading state according to claim 1, characterized in that: The force measuring unit adopts a spring balance.

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