Rolling bearing durability detection testing machine and detection method thereof

Abstract

The invention belongs to the technical field of detection, and particularly relates to testing of mechanical parts, in particular to a rolling bearing durability detection testing machine and a detection method thereof. The rolling bearing durability detection testing machine comprises a speed regulation motor which is in transmission connection with an experiment main shaft through a speed reducer; the axial pressure head is horizontally arranged at one end of the experiment main shaft; the plurality of adjusting limiting pieces are arranged on the outer wall of the experiment main shaft in a sliding manner; wherein the axial pressure head drives the bearing to axially move along the experiment main shaft, the end wall of the bearing abuts against the adjusting limiting piece, and the bearing continues to move to push the adjusting limiting piece to axially move relative to the experiment main shaft; each adjusting and limiting piece axially moves and radially contracts until the end wall of the adjusting and limiting piece is separated from the end wall of the outer ring of the bearing; if the relative deflection of the inner ring and the outer ring is smaller than a set value, the inner ring of the bearing is suitable for extruding each adjusting and limiting piece to axially displace; and if the relative deflection of the inner ring and the outer ring is larger than a set value, the adjusting limiting piece is suitable for limiting the inner ring of the bearing.

Description

Technical Field

[0001] This invention belongs to the field of testing technology, specifically relating to the testing of mechanical components, and particularly to a rolling bearing durability testing machine and its testing method. Background Technology

[0002] As a core component of mechanical transmission systems, rolling bearings directly impact the lifespan and operational stability of the entire equipment. Rolling bearing durability testing, through accelerated life tests simulating actual operating conditions, is crucial for evaluating bearing fatigue life, reliability, and performance degradation patterns. The core of this type of testing lies in applying specific loads, speeds, and environmental conditions to obtain near-realistic performance data.

[0003] During durability testing, relative deflection exceeding the allowable range may occur between the inner and outer rings of a bearing. This deflection will cause abnormal stress distribution within the bearing, leading to problems such as accelerated local wear, increased vibration and noise, and abnormal temperature rise. Ultimately, this distorts the life prediction data and severely affects the accuracy and reliability of the test results. Due to the complex operating conditions of bearings in actual use, a certain degree of adaptive deflection is permissible in the inner ring. This slight deflection is itself a normal characteristic of the bearing and does not significantly affect its service life. However, if the deflection angle becomes uncontrolled during testing, the test conditions will deviate from the design conditions, failing to accurately reflect the bearing's performance boundaries.

[0004] To simulate real-world operating conditions, bearings typically do not have limiting devices on their inner rings during durability testing. However, this can lead to deflection exceeding reasonable limits, creating a technical dilemma: "no limiting means uncontrolled deflection, limiting means distortion." In related technologies, a fixed stepped surface is usually installed on the outer wall of the shaft to limit the axial displacement of the bearing's inner ring. While this structure effectively suppresses axial movement, its fixed limiting surface cannot accommodate the slight deflections required during actual operation, resulting in significant differences between the testing conditions and real-world operating conditions. Particularly for certain bearing types that require simulating slight self-aligning during testing, the fixed limiting method completely suppresses their inherent adaptive behavior, rendering the test results meaningless.

[0005] Therefore, how to ensure that the bearing does not deflect abnormally during the durability test, while allowing its inner ring to have a micro-adaptive offset capability that conforms to the actual working conditions, is a key technical problem that urgently needs to be solved in this field.

[0006] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore, the above description is not considered to constitute information related to the technology. Summary of the Invention

[0007] This disclosure provides at least one rolling bearing durability testing machine and its testing method.

[0008] In a first aspect, embodiments of this disclosure provide a rolling bearing durability testing machine, comprising: A radial loading stage, fixed to the experimental platform, is used to limit the outer ring of the bearing; A speed-regulating motor is fixed on the experimental platform and is connected to the experimental main shaft via a reducer. An axial pressure head, which is horizontally positioned at one end of the experimental spindle, is used to drive the bearing to move axially. Adjustable limiting components, several of which are slidably disposed on the outer wall of the experimental main shaft; Among them, the axial pressure head drives the bearing to move axially along the experimental main shaft, the bearing end wall abuts against the adjusting limit piece, and the bearing continues to move to push the adjusting limit piece to move axially relative to the experimental main shaft. Each adjusting limit component moves axially and retracts radially until the end wall of the adjusting limit component disengages from the end wall of the outer ring of the bearing; If the relative deflection between the inner ring and the outer ring is less than the set value, the inner ring of the bearing is suitable for compressing the axial displacement of each adjusting limit component; If the relative deflection between the inner and outer rings is greater than the set value, the adjusting limit element is adapted to limit the inner ring of the bearing.

[0009] In one optional embodiment, the outer wall of the experimental spindle is circumferentially distributed with several receiving grooves, and the bottom wall of the receiving groove is provided with an inclined surface along the axial direction. When the adjusting limiter slides along the inclined surface axially, each adjusting limiter synchronously retracts radially into the receiving groove.

[0010] In one optional embodiment, the adjusting limiter includes: A limiting plate extends radially along the main experimental axis, and its inner end is slidably set on an inclined surface; The adjusting plate is fixed to the side wall of the limiting plate, is arc-shaped, and extends axially along the main experimental axis. When the bearing pushes the limiting plate to move axially and retracts radially into the receiving groove, the adjusting plate is adapted to move axially to the outer wall of the experimental spindle.

[0011] In one optional embodiment, a guide rail is provided on the inclined surface, and the guide rail extends axially along the experimental main shaft. The limiting plate has a groove that matches the guide rail, and the guide rail is adapted to guide and adjust the axial displacement of the limiting component.

[0012] In one optional embodiment, guide grooves are respectively provided on both sides of the guide rail, and a protrusion matching the guide groove is provided on the limiting plate near the sliding groove, and the protrusion is slidably disposed in the guide groove.

[0013] In one alternative embodiment, the adjusting member further includes a return spring, one end of which is fixed to the side wall of the limiting plate and the other end of which abuts against the side wall of the receiving groove. The return spring is adapted to push the adjusting member to move away from the speed regulating motor.

[0014] In one optional embodiment, the outer diameter of the limiting plate is not greater than the outer ring diameter of the bearing; When the bearing moves axially to the point where it abuts against the side wall of the limiting plate, the side wall of the limiting plate simultaneously abuts against the end walls of the inner and outer rings of the bearing.

[0015] In one optional embodiment, an oil storage cavity is provided near the receiving groove on the experimental spindle, and an oil passage communicating with the oil storage cavity is provided along the axial direction on the experimental spindle. A connecting pipe is fixed to the side wall of the limiting plate, which passes through the limiting plate and has its inner end facing the oil storage cavity; When the bearing pushes the limiting plate to move axially and retracts radially to the detection station, the connecting pipe is adapted to be inserted into the oil storage cavity.

[0016] In one alternative embodiment, a one-way valve is provided on the side of the oil storage chamber near the connecting pipe, and the connecting pipe is adapted to be inserted into the one-way valve to guide the grease flow to the bearing.

[0017] In one alternative implementation, the experimental spindle is fixed to the end of the rotating shaft of a speed-regulating motor. Adjustable limiting components, several of which are slidably disposed on the outer wall of the experimental main shaft; The outer wall of the experimental spindle is evenly distributed with several receiving grooves, and the bottom wall of the receiving groove is provided with an inclined surface along the axial direction. A guide rail is provided on the inclined surface, and the guide rail extends along the axial direction of the experimental main shaft. The adjusting limiting component includes: A limiting plate extends radially along the experimental main shaft, and its inner end is slidably mounted on a guide rail; The adjusting plate is fixed to the side wall of the limiting plate, is arc-shaped, and extends axially along the main experimental axis. When the bearing pushes the limiting plate to move axially and retracts radially into the receiving groove, the adjusting plate is adapted to move axially to the outer wall of the experimental spindle. If the relative deflection between the inner and outer rings is less than the set value, the inner ring of the bearing is suitable for compressing the axial displacement of each limiting plate; If the relative deflection between the inner and outer rings is greater than a set value, the limiting plate is adapted to limit the inner ring of the bearing.

[0018] Secondly, embodiments of this disclosure also provide a testing method for a rolling bearing durability testing machine, the testing method comprising: The axial pressure head drives the bearing to move axially along the experimental spindle. The bearing end wall abuts against the adjusting limit piece, and the bearing continues to move to push the adjusting limit piece to move axially relative to the experimental spindle. Each adjusting limit component moves axially and retracts radially until the end wall of the adjusting limit component disengages from the end wall of the outer ring of the bearing; If the relative deflection between the inner ring and the outer ring is less than the set value, the inner ring of the bearing is suitable for compressing the axial displacement of each adjusting limit component; If the relative deflection between the inner and outer rings is greater than the set value, the adjusting limit element is adapted to limit the inner ring of the bearing.

[0019] The beneficial effects of this invention are that it provides a rolling bearing durability testing machine and its testing method. By adjusting the sliding design of the limiting component, the problem of testing distortion caused by the traditional fixed limiting method is solved. During the test, the inner ring of the bearing is allowed to undergo slight adaptive deflection (simulating real working conditions). However, when the deflection exceeds the set value, the limiting component automatically limits the inner ring, preventing stress concentration, accelerated wear, and other problems caused by abnormal deflection, thus significantly improving the accuracy and reliability of the test data. The inclined plane, guide rail, and return spring on the experimental spindle ensure the smooth axial movement of the limiting component and its automatic reset capability, reducing the risk of mechanical interference.

[0020] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of the present invention, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a front view of the rolling bearing durability testing machine provided in an embodiment of this disclosure; Figure 2 A perspective view of the experimental spindle and adjusting limiter provided in the embodiments of this disclosure; Figure 3 A perspective axial cross-sectional view of the experimental spindle and adjusting limiter provided in the embodiments of this disclosure; Figure 4 A radial sectional perspective view of the experimental spindle and the adjusting limiter provided in the embodiments of this disclosure; Figure 5 A perspective view of the axial movement of the bearing-driven adjustment and limiting component provided in the embodiments of this disclosure; Figure 6 This is a top view of the rolling bearing durability testing machine provided in an embodiment of this disclosure.

[0024] In the picture: 1. Radial loading table; 2. Speed-regulating motor; 21. Reducer; 3. Axial pressure head; 4. Adjustable limiting component; 41. Limiting plate; 42. Adjusting piece; 43. Protrusion; 44. Return spring; 45. Connecting pipe; 5. Experimental platform; 6. Experimental spindle; 60. Receiving groove; 61. Inclined surface; 62. Guide rail; 63. Guide groove; 64. Oil storage chamber; 7. Bearings. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0027] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify an entire column of elements when following a column of elements. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0028] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise expressly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0029] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0030] Research has shown that rolling bearings, as a core component of mechanical transmission systems, directly affect the lifespan and operational stability of the entire equipment. Rolling bearing durability testing, through accelerated life tests simulating actual operating conditions, is of great significance for evaluating the bearing's fatigue life, reliability, and performance degradation patterns. The core of this type of testing lies in applying specific loads, speeds, and environmental conditions to obtain near-realistic performance data.

[0031] During durability testing, relative deflection exceeding the allowable range may occur between the inner and outer rings of a bearing. This deflection will cause abnormal stress distribution within the bearing, leading to problems such as accelerated local wear, increased vibration and noise, and abnormal temperature rise. Ultimately, this distorts the life prediction data and severely affects the accuracy and reliability of the test results. Due to the complex operating conditions of bearings in actual use, a certain degree of adaptive deflection is permissible in the inner ring. This slight deflection is itself a normal characteristic of the bearing and does not significantly affect its service life. However, if the deflection angle becomes uncontrolled during testing, the test conditions will deviate from the design conditions, failing to accurately reflect the bearing's performance boundaries.

[0032] To simulate real-world operating conditions, bearings typically do not have limiting devices on their inner rings during durability testing. However, this can lead to deflection exceeding reasonable limits, creating a technical dilemma: "no limiting means uncontrolled deflection, limiting means distortion." In related technologies, a fixed stepped surface is usually installed on the outer wall of the shaft to limit the axial displacement of the bearing's inner ring. While this structure effectively suppresses axial movement, its fixed limiting surface cannot accommodate the slight deflections required during actual operation, resulting in significant differences between the testing conditions and real-world operating conditions. Particularly for certain bearing types that require simulating slight self-aligning during testing, the fixed limiting method completely suppresses their inherent adaptive behavior, rendering the test results meaningless.

[0033] Therefore, ensuring that bearings do not experience abnormal deflection during durability testing while allowing their inner rings to have a micro-adaptive offset capability consistent with actual operating conditions is a key technical problem that urgently needs to be solved in this field. The defects in the above solutions and their causes are the results of the inventors' practical experience and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered contributions made by the inventors to this disclosure.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0036] like Figure 1 As shown, at least one embodiment provides a rolling bearing durability testing machine, comprising: The experimental setup includes a radial loading stage 1, a speed-regulating motor 2, an axial pressure head 3, an adjusting limiter 4, and an experimental platform 5. The experimental spindle 6 is connected to the speed-regulating motor 2 via a reducer 21 to drive the bearing rotation. The radial loading stage 1 is fixed to the experimental platform 5 to limit the outer ring of the bearing and simulate radial load. The axial pressure head 3 is horizontally positioned at one end of the experimental spindle 6 and drives the bearing to move axially via hydraulic or pneumatic pressure.

[0037] Reference Appendix Figure 2The experimental spindle 6 has several circumferentially distributed receiving grooves 60 on its outer wall. The bottom wall of each receiving groove 60 has an inclined surface 61. When the adjusting limiting member 4 slides along the inclined surface 61, it can achieve radial contraction. Several adjusting limiting members 4 are slidably disposed within the receiving grooves 60 on the outer wall of the experimental spindle 6. The axial pressure head 3 drives the bearing to move axially along the experimental spindle 6, with the bearing end wall abutting against the adjusting limiting member 4. The bearing continues to move to push the adjusting limiting member 4 to move axially relative to the experimental spindle 6. Each adjusting limiting member 4 moves axially and contracts radially until its end wall disengages from the outer ring end wall of the bearing. If the relative deflection between the inner and outer rings is less than a set value, the inner ring of the bearing is suitable for compressing the axial displacement of each adjusting limiting member 4. If the relative deflection between the inner and outer rings is greater than a set value, the adjusting limiting member 4 is suitable for limiting the inner ring of the bearing.

[0038] Reference Appendix Figure 3 The adjusting limiting component 4 includes a limiting plate 41 and an adjusting plate 42. The inner end of the limiting plate 41 is slidably mounted on the inclined surface 61, and the outer end is used to abut against the bearing end wall. The adjusting plate 42 is arc-shaped and fixed to the side wall of the limiting plate 41. Its axial extension design allows it to fit against the outer wall of the experimental spindle 6 after retraction, avoiding interference with the bearing rotation. It also prevents residual grease in the connecting pipe 45 from splashing outwards. A return spring 44 is installed between the limiting plate 41 and the side wall of the receiving groove 60, used to push the adjusting limiting component 4 back to its original position after the test, improving the reusability of the equipment. The outer diameter of the limiting plate 41 is no larger than the outer ring diameter of the bearing, ensuring that it simultaneously contacts the inner and outer ring end walls of the bearing, achieving precise positioning.

[0039] Reference Appendix Figure 4 To enable the limiting plate 41 to move axially along the guide rail 62 and slide radially relative to the experimental main shaft 6, a guide rail 62 is provided on the inclined surface 61, extending axially along the experimental main shaft 6. The limiting plate 41 has a groove matching the guide rail 62, which is suitable for guiding the axial displacement of the adjusting limiting member 4. Guide grooves 63 are respectively provided on both side walls of the guide rail 62. A protrusion 43 matching the guide groove 63 is provided on the limiting plate 41 near the groove, and the protrusion 43 is slidably disposed within the guide groove 63. The design of the guide rail 62 and the protrusion 43 further optimizes the sliding accuracy: the guide rail 62 extends axially, the groove of the limiting plate 41 matches the guide rail 62, and the guide grooves 63 on both sides cooperate with the protrusions 43, ensuring that the adjusting limiting member 4 moves only axially and preventing radial offset.

[0040] Reference Appendix Figure 5An oil storage chamber 64 is formed near the receiving groove 60 on the experimental spindle 6. An oil passage communicating with the oil storage chamber 64 is formed along the axial direction of the experimental spindle 6. A connecting pipe 45 is fixed to the side wall of the limiting plate 41, passing through the limiting plate 41 with one end facing the oil storage chamber 64. When the bearing pushes the limiting plate 41 axially and retracts radially to the detection position, the connecting pipe 45 is adapted to be inserted into the oil storage chamber 64. A one-way valve is provided on the side of the oil storage chamber 64 near the connecting pipe 45, and the connecting pipe 45 is adapted to be inserted into the one-way valve to guide the grease flow to the bearing. The one-way valve prevents the grease in the oil storage chamber 64 from overflowing. When the connecting pipe 45 is inserted into the one-way valve, the grease in the oil storage chamber 64 flows to the bearing through the connecting pipe 45, and as the experimental spindle 6 rotates, the oil flows between the inner and outer rings of the bearing.

[0041] At least one embodiment provides a rolling bearing durability testing machine, comprising: The experimental spindle 6 is fixed to the end of the rotating shaft of the speed-regulating motor 2; Adjustable limiting member 4, several of the aforementioned adjustable limiting members 4 are slidably disposed on the outer wall of the experimental main shaft 6; The outer wall of the experimental spindle 6 is evenly distributed with several receiving grooves 60, and the bottom wall of the receiving groove 60 is provided with an inclined surface 61 along the axial direction. A guide rail 62 is provided on the inclined surface 61, and the guide rail 62 extends along the experimental main shaft 6. The adjusting limiting member 4 includes: The limiting plate 41 extends radially along the experimental main shaft 6, and its inner end is slidably mounted on the guide rail 62; Adjustment piece 42, which is fixed to the side wall of limiting plate 41, is arc-shaped and extends axially along the experimental main shaft 6; When the bearing pushes the limiting plate 41 to move axially and retracts radially into the receiving groove 60, the adjusting plate 42 is adapted to move axially to the outer wall of the experimental spindle 6. If the relative deflection between the inner ring and the outer ring is less than the set value, the inner ring of the bearing is suitable for compressing the axial displacement of each limiting plate 41. If the relative deflection between the inner and outer rings is greater than a set value, the limiting plate 41 is adapted to limit the inner ring of the bearing.

[0042] The working principle of a rolling bearing durability testing machine is as follows: For bearing installation and initial positioning, place the bearing onto the experimental spindle 6, with the outer ring of the bearing fixed by the radial loading stage 1. Start the speed-regulating motor 2 and adjust the spindle speed to the set value (e.g., 1000-3000 rpm, depending on the bearing type) via the reducer 21.

[0043] Axial loading and deflection detection: The axial pressure head 3 drives the bearing to move axially along the main shaft, and the bearing end wall abuts against the limiting plate 41. As it continues to move, the bearing pushes the adjusting limiting piece 4 to slide axially along the guide rail 62, and the limiting plate 41 radially retracts into the receiving groove 60, causing the adjusting piece 42 to disengage from the outer ring end wall (at this time, the outer ring is free and the inner ring is controlled). Figure 5 In the diagram, F1 indicates the axial displacement direction of the bearing inner ring pressing limit plate 41; F2 indicates the radial contraction sliding direction of the adjusting plate 42.

[0044] If the relative deflection between the inner and outer rings is less than the set value (e.g., 0.5°-1°), the slight deflection of the inner ring is normal. When the adjusting limiter 4 is in the detection position, it still has a certain amount of displacement in the axial direction. This amount of displacement matches the relative deflection value between the inner and outer rings. The adjusting limiter 4 is subjected to axial displacement under pressure, but does not restrict the movement of the inner ring, ensuring a realistic simulation.

[0045] If the deflection is greater than the set value, the axial displacement of the limiting plate 41 reaches its maximum value. At this time, when the inner ring continues to deflect, the limiting plate 41 forcibly limits the deflection of the inner ring end wall to prevent abnormal wear.

[0046] Data recording and result analysis: Real-time acquisition of bearing vibration, temperature rise, and noise data through sensors (such as torque sensors and temperature sensors), recording deflection angle and life curve.

[0047] At least one embodiment provides a testing method for a rolling bearing durability testing machine, the testing method comprising: The axial pressure head 3 drives the bearing to move axially along the experimental main shaft 6. The bearing end wall abuts against the adjusting limit piece 4. The bearing continues to move to push the adjusting limit piece 4 to move axially relative to the experimental main shaft 6. Each adjusting limit component 4 moves axially and retracts radially until the end wall of the adjusting limit component 4 disengages from the end wall of the outer ring of the bearing; If the relative deflection between the inner ring and the outer ring is less than the set value, the inner ring of the bearing is suitable for squeezing the axial displacement of each adjusting limit component 4; If the relative deflection between the inner and outer rings is greater than the set value, the adjusting limit member 4 is adapted to limit the inner ring of the bearing.

[0048] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0049] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as a second element, component, region, layer, or segment.

[0050] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A rolling bearing durability testing machine, characterized in that, include: A radial loading stage (1) is fixed on the experimental platform (5) and is used to limit the outer ring of the bearing (7); Speed-regulating motor (2) is fixed on the experimental platform (5) and is connected to the experimental spindle (6) via a reducer (21); An axial pressure head (3) is horizontally positioned at one end of the experimental spindle (6) and is used to drive the bearing (7) to move axially. Adjustable limiting components (4), several of the aforementioned adjustable limiting components (4) are slidably disposed on the outer wall of the experimental main shaft (6); Among them, the axial pressure head (3) drives the bearing (7) to move axially along the experimental main shaft (6), the end wall of the bearing (7) abuts against the adjusting limit piece (4), and the bearing (7) continues to move to push the adjusting limit piece (4) to move axially relative to the experimental main shaft (6); Each adjusting limit piece (4) moves axially and retracts radially to the detection station, and the end wall of the adjusting limit piece (4) disengages from the outer ring end wall of the bearing (7); If the relative deflection between the inner ring and the outer ring is less than the set value, the inner ring of the bearing (7) is suitable for squeezing the axial displacement of each adjusting limit piece (4); If the relative deflection between the inner and outer rings is greater than the set value, the adjusting limit member (4) is adapted to limit the inner ring of the bearing (7).

2. The rolling bearing durability testing machine as described in claim 1, characterized in that, The outer wall of the experimental spindle (6) is evenly distributed with several receiving grooves (60). The bottom wall of the receiving groove (60) is provided with an inclined surface (61) along the axial direction. When the adjusting limiter (4) slides along the inclined surface (61) in the axial direction, each adjusting limiter (4) synchronously retracts radially into the receiving groove (60).

3. The rolling bearing durability testing machine as described in claim 2, characterized in that, The adjusting limit member (4) includes: A limiting plate (41) extends radially along the experimental main shaft (6) and its inner end is slidably disposed on the inclined surface (61); Adjustment plate (42), which is fixed to the side wall of limiting plate (41), is arc-shaped and extends along the experimental main axis (6); When the bearing pushes the limiting plate (41) to move axially and retracts radially into the receiving groove (60), the adjusting plate (42) is adapted to move axially to the outer wall of the experimental spindle (6).

4. The rolling bearing durability testing machine as described in claim 3, characterized in that, A guide rail (62) is provided on the inclined plane (61), and the guide rail (62) extends axially along the experimental main shaft (6); The limiting plate (41) has a groove that matches the guide rail (62), and the guide rail (62) is adapted to guide the axial displacement of the adjusting limiting member (4).

5. The rolling bearing durability testing machine as described in claim 4, characterized in that, The guide rail (62) has guide grooves (63) on both sides. The limiting plate (41) has a protrusion (43) that matches the guide groove (63) near the slide groove. The protrusion (43) is slidably disposed in the guide groove (63).

6. The rolling bearing durability testing machine as described in claim 3, characterized in that, The adjusting component also includes a reset spring (44), one end of which is fixed to the side wall of the limiting plate (41), and the other end abuts against the side wall of the receiving groove (60). The reset spring (44) is adapted to push the adjusting component to move away from the speed regulating motor (2).

7. The rolling bearing durability testing machine as described in claim 6, characterized in that, The outer diameter of the limiting plate (41) is not greater than the outer ring diameter of the bearing; When the bearing moves axially to the point where it abuts against the side wall of the limiting plate (41), the side wall of the limiting plate (41) abuts against both the inner and outer ring end walls of the bearing.

8. The rolling bearing durability testing machine as described in claim 3, characterized in that, An oil storage cavity (64) is provided near the receiving groove (60) on the experimental spindle (6), and an oil passage communicating with the oil storage cavity (64) is provided along the axial direction on the experimental spindle (6); A connecting pipe (45) is fixed to the side wall of the limiting plate (41), which passes through the limiting plate (41) and one end faces the oil storage cavity (64). When the bearing (7) pushes the limiting plate (41) to move axially and retract radially to the detection station, the connecting pipe (45) is suitable for insertion into the oil storage cavity (64).

9. The rolling bearing durability testing machine as described in claim 8, characterized in that, A one-way valve is provided on the side of the oil storage chamber (64) near the connecting pipe (45), and the connecting pipe (45) is adapted to be inserted into the one-way valve to guide the grease to flow to the bearing (7).

10. A rolling bearing durability testing machine, characterized in that, include: The experimental spindle (6) is fixed to the end of the rotating shaft of the speed-regulating motor (2); Adjustable limiting components (4), several of the aforementioned adjustable limiting components (4) are slidably disposed on the outer wall of the experimental main shaft (6); The outer wall of the experimental spindle (6) is evenly distributed with several receiving grooves (60), and the bottom wall of the receiving groove (60) is provided with an inclined surface (61) along the axial direction. A guide rail (62) is provided on the inclined plane (61), and the guide rail (62) extends axially along the experimental main shaft (6); The adjusting limit member (4) includes: A limiting plate (41) extends radially along the experimental main shaft (6) and its inner end is slidably mounted on the guide rail (62); Adjustment plate (42), which is fixed to the side wall of limiting plate (41), is arc-shaped and extends along the experimental main axis (6); When the bearing pushes the limiting plate (41) to move axially and retracts radially into the receiving groove (60), the adjusting plate (42) is adapted to move axially to the outer wall of the experimental spindle (6); If the relative deflection between the inner ring and the outer ring is less than the set value, the inner ring of the bearing is suitable for squeezing the axial displacement of each limiting plate (41); If the relative deflection between the inner and outer rings is greater than the set value, the limiting plate (41) is adapted to limit the inner ring of the bearing.

11. A testing method for a rolling bearing durability testing machine, characterized in that, The rolling bearing durability testing machine as described in any one of claims 1-9 is used, and the testing method includes: The axial pressure head (3) drives the bearing to move axially along the experimental main shaft (6), and the bearing end wall abuts against the adjusting limit piece (4). The bearing continues to move to push the adjusting limit piece (4) to move axially relative to the experimental main shaft (6). Each adjusting limit piece (4) moves axially and retracts radially until the end wall of the adjusting limit piece (4) disengages from the end wall of the outer ring of the bearing; If the relative deflection between the inner ring and the outer ring is less than the set value, the inner ring of the bearing is suitable for squeezing the axial displacement of each adjusting limit piece (4); If the relative deflection between the inner and outer rings is greater than the set value, the adjusting limit member (4) is adapted to limit the inner ring of the bearing.

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