A fretting wear test device for bearing mating surface journal shoulder

Abstract

The invention discloses a micro-motion wear test device applied to a journal shoulder of a bearing mating surface, which belongs to the field of vibration wear testing equipment. The device comprises a base and a rotation drive component, a support component, an axial force loading component and a first radial force loading component arranged on the base; the support component comprises two first bases and one second base, the two first bases are used to support a transmission shaft, a first bearing is sleeved on the transmission shaft, and the second base is arranged between the two first bases and is used to support the first bearing; the axial force loading component comprises a first threaded member, which is threadedly connected to one of the two first bases; the first radial force loading component comprises a second threaded member, which is threadedly connected to the second base; the rotation drive component is transmission-connected to the transmission shaft to drive the transmission shaft to rotate, thereby improving the application scope of the test device.

Description

Technical Field

[0001] The invention belongs to the technical field of vibration wear testing equipment, and in particular relates to a micro-motion wear testing device applied to a journal shoulder of a bearing mating surface. Background Art

[0002] Bearings are key components in mechanical transmission systems and are widely used in the automotive, aerospace, industrial machinery, energy, and rail transportation industries. They are mainly responsible for supporting rotating shafts and bearing loads to ensure smooth and precise movement.

[0003] Usually, in the structure where the bearing and the transmission shaft are matched, there is fretting wear between the inner ring of the bearing and the journal and shoulder of the transmission shaft. Fretting wear refers to the wear between the contact surfaces under slight vibration or relative motion, that is, the wear between the inner wall of the inner ring of the bearing and the outer surface of the journal of the transmission shaft, the wear between the end face of the inner ring of the bearing and the shoulder surface of the transmission shaft, etc. The fretting wear between the inner ring of the bearing and the journal and shoulder of the transmission shaft easily increases the gap between the inner ring of the bearing and the transmission shaft, causing the connection between the bearing and the transmission shaft to loosen, which in turn causes the connection between the bearing and the transmission shaft to fail, affecting the reliability of the mechanical structure.

[0004] In order to improve the reliability of the matching between the bearing and the transmission shaft, it is necessary to use a wear test device to test and analyze the micro-motion wear between the bearing and the transmission shaft. The common wear test device currently consists of a machine table and a hydraulic rod. The transmission shaft is fixed on the machine table, the bearing sleeve is set on the transmission shaft, and the hydraulic rod applies force to the bearing to simulate the load on the bearing and the transmission shaft during use. By measuring the deformation and wear of the bearing, the wear analysis between the bearing and the transmission shaft can be realized. However, this device has a simple structure and limited applicable working conditions, and cannot meet the complex load environment where multiple forces exist simultaneously. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a micro-wear test device for the journal shoulder of the bearing mating surface. The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0006] The present invention provides a micro-motion wear test device for a journal shoulder of a bearing mating surface, comprising a base and a rotary drive assembly, a support assembly, an axial force loading assembly and a first radial force loading assembly arranged on the base;

[0007] The support assembly includes two first bases and one second base, the two first bases are used to support the transmission shaft, the transmission shaft is sleeved with a first bearing, and the second base is arranged between the two first bases and is used to support the first bearing;

[0008] The axial force loading assembly comprises a first threaded member, the first threaded member is threadedly connected to one of the two first bases, and the first threaded member applies an axial force to the transmission shaft when rotating relative to the first base;

[0009] The first radial force loading assembly comprises a second threaded member, the second threaded member is threadedly connected to the second base, and the second threaded member applies a force in the radial direction of the first bearing when rotating relative to the second base;

[0010] The rotary drive assembly is in driving connection with the transmission shaft to drive the transmission shaft to rotate.

[0011] In one embodiment of the present invention, bearing holes are provided on the two first bases, and second bearings are provided between the transmission shaft and the bearing holes of the two first bases. The second bearings include an inner ring and an outer ring. The inner ring of the second bearing is fixed to the outer periphery of the transmission shaft, and the outer ring of the second bearing is fixed to the inner wall of the bearing hole.

[0012] The axial force loading assembly also includes a heat-insulating ring, a pressure plate, a pressure ring and an axial pressure sensor. The heat-insulating ring and the pressure ring are both sleeved on the outer circumference of the transmission shaft. The pressure plate, the heat-insulating ring, the pressure ring and the second bearing are arranged in sequence. A protrusion is provided on the pressure ring, and the protrusion abuts against the outer ring of the second bearing. A first through-hole is provided on the pressure plate, and a first threaded hole is provided on the first base. The first threaded member passes through the first through-hole and is threadedly connected with the first threaded hole. A pressure block is provided on the first threaded member. When the first threaded member rotates relative to the first base, the pressure block applies pressure to the pressure plate, and the pressure plate applies pressure to the outer ring of the second bearing through the heat-insulating ring and the pressure ring. When the outer ring of the second bearing is subjected to pressure, it drives the inner ring of the second bearing to apply pressure along its axial direction to the transmission shaft;

[0013] The axial pressure sensor is arranged between the pressing block and the pressing plate to detect the force applied by the first screw member.

[0014] In one embodiment of the present invention, six first threaded members are provided, six first through-holes are provided on the pressing plate, six first threaded holes are provided on the first base, the six first through-holes are evenly distributed along the circumference of the pressing plate, and the six first threaded members respectively pass through the six first through-holes and are respectively threadedly connected with the six first threaded holes;

[0015] There are six axial pressure sensors, which are used to detect the forces applied by the six first threaded members respectively;

[0016] The axial force loading assembly further includes six drivers, which are respectively connected to the six first threaded members to respectively drive the six first threaded members to rotate;

[0017] The micro-motion wear test device also includes a controller, and the six axial pressure sensors and six drivers are all connected to the controller. The controller is used to control the actions of the six drivers respectively according to the detection results of the six axial pressure sensors, so as to respectively control the magnitude of the force applied by the six first threaded members.

[0018] In one embodiment of the present invention, two axial force loading assemblies are provided, the two axial force loading assemblies are arranged opposite to each other and are respectively connected to the two first bases, and the two axial force loading assemblies are used to apply two axial forces in opposite directions to both sides of the transmission shaft respectively.

[0019] In one embodiment of the present invention, it also includes a mounting plate, a first fastener and a second fastener, the mounting plate is connected to the base, and two first fixing holes and two second fixing holes are provided on the mounting plate;

[0020] Among the two first bases, the first base close to the rotating drive component and the first fixing hole are fastened together by a first fastener, and the first base far from the rotating drive component and the second fixing hole are fastened together by a second fastener. The second fixing holes are arc-shaped holes symmetrically arranged on both sides of the first base, and the inner recesses of the two arc-shaped holes are arranged opposite to each other.

[0021] In one embodiment of the present invention, the second base includes an outer frame and a slider, a guide rail extending in the radial direction of the first bearing is provided in the outer frame, the slider and the guide rail are slidably connected, a positioning hole is provided in the slider, the inner ring of the first bearing is fixed to the outer periphery of the transmission shaft, and the outer ring of the first bearing is fixed to the hole wall of the positioning hole;

[0022] The first radial force loading assembly also includes a stop plate, an extrusion piece, a radial pressure sensor and a heat insulating piece which are arranged in sequence, the stop plate and the extrusion piece are fixedly connected to the second threaded piece, the radial pressure sensor and the heat insulating piece are provided with a second through hole, the slider is provided with a second threaded hole, the second threaded piece passes through the second through holes on the pressure sensor and the heat insulating piece in sequence and is threadedly connected to the second threaded hole;

[0023] A slide groove is arranged on the limit plate, the slide groove and the guide rail are snap-fitted, and the limit plate and the guide rail are slidably connected.

[0024] In one embodiment of the present invention, it also includes a third base and a second radial force loading assembly, the third base is connected to the base, the third base is arranged between the first base and the second base and is used to support the transmission shaft, the second radial force loading assembly includes a third threaded member, the third threaded member and the third base are threadedly connected, and when the third threaded member rotates relative to the third base, it applies a radial force to the transmission shaft, and the first radial force loading assembly and the second radial force loading assembly are located on the same side or different sides of the transmission shaft.

[0025] In one embodiment of the present invention, it also includes a mounting plate and an adjustment component, the first base and the second base are both arranged on the mounting plate, the adjustment component includes a turntable, a fixed plate, a sliding block and a linear drive mechanism, the turntable and the base are fixedly connected, the fixed plate and the turntable are rotatably connected, the sliding block and the fixed plate are slidably connected, the linear drive mechanism is installed on the fixed plate and is used to drive the sliding block to perform linear motion, and the mounting plate and the sliding block are fixedly connected.

[0026] In one embodiment of the present invention, the rotary drive assembly includes a motor, a speed increaser and a torque sensor which are sequentially connected in transmission, and the torque sensor and the transmission shaft are fixedly connected via a coupling.

[0027] In one embodiment of the present invention, it also includes a speed sensor, an acceleration sensor and a temperature sensor. The speed sensor is installed on the transmission shaft to detect the rotation speed of the transmission shaft. The acceleration sensor is installed on the transmission shaft to detect the vibration frequency of the transmission shaft. The transmission shaft includes a journal and a shoulder. The first bearing is sleeved on the journal. The shoulder is used to position the first bearing. The temperature sensor is used to detect the temperature values ​​at the journal and the shoulder.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] In the above scheme of the present application, the micro-motion wear test device includes a base and a rotation drive assembly, a support assembly, an axial force loading assembly and a first radial force loading assembly arranged on the base; the support assembly includes two first bases and one second base, the two first bases are used to support the transmission shaft, the transmission shaft is sleeved with a first bearing, and the second base is arranged between the two first bases and used to support the first bearing; the axial force loading assembly includes a first threaded member, the first threaded member is threadedly connected to one of the two first bases, and the first threaded member applies an axial force to the transmission shaft when rotating relative to the first base; the first radial force loading assembly includes a second threaded member, the second threaded member is threadedly connected to the second base, and the second threaded member applies a radial force to the first bearing when rotating relative to the second base; the rotation drive assembly is connected to the transmission shaft to drive the transmission shaft to rotate. With this structure, the stability of the transmission shaft installation can be improved by supporting the transmission shaft through the two first bases, and the stability of the first bearing installation can be improved by supporting the first bearing through the second base. Among them, when the axial force loading component applies an axial force to the transmission shaft, since the first bearing is fixed on the second base, the transmission shaft can apply an axial force to the inner ring of the first bearing, thereby simulating the working state of the first bearing and the transmission shaft when subjected to the axial force. When the radial force loading component applies a radial force to the first bearing, the first bearing can apply a radial force to the transmission shaft in the radial direction, thereby simulating the working state of the first bearing and the transmission shaft when subjected to the radial force. The transmission shaft is driven to rotate by the rotary drive component, so that the transmission shaft can be in a rotating state during the process of applying the load, thereby accurately simulating the load conditions in the actual use environment and improving the test accuracy, and the rotary drive component can apply a torsional force to the transmission shaft, thereby simulating the working state of the first bearing and the transmission shaft when subjected to the torsional force. Through the coordinated use of the axial force loading component, the radial force loading component and the rotary drive component, the test device can simulate the complex load environment in which the first bearing and the transmission shaft are simultaneously subjected to multiple forces such as axial force, radial force and torsional force, so that the test device can be suitable for the test and analysis of vibration wear performance under high-speed and heavy-load operating conditions such as bending-torsion coupling, thereby improving the scope of application of the test device.

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a three-dimensional schematic diagram of a fretting wear test device provided in an embodiment of the present invention;

[0032] Figure 2 is a top view of a fretting wear testing device provided by an embodiment of the present invention;

[0033] Figure 3is a front view of a fretting wear testing device provided by an embodiment of the present invention;

[0034] Figure 4 is a schematic diagram of the fretting wear test device in an embodiment of the present invention after the base is removed;

[0035] Figure 5 is a schematic diagram of a speed increaser in an embodiment of the present invention;

[0036] Figure 6 is a schematic diagram of an axial force loading component, a first radial force loading component and an adjustment component in an embodiment of the present invention;

[0037] Figure 7 is an exploded schematic diagram of an axial force loading assembly, a first radial force loading assembly, and an adjustment assembly in an embodiment of the present invention;

[0038] Figure 8 is a schematic diagram of a mounting plate in an embodiment of the present invention;

[0039] Fig. 9 is a schematic diagram of an axial force loading assembly in an embodiment of the present invention;

[0040] Fig.10 is a cross-sectional view of an axial force loading assembly according to an embodiment of the present invention;

[0041] Fig.11 is a schematic diagram of a first radial force loading assembly in an embodiment of the present invention;

[0042] Fig.12 Schematic diagram of a first radial force loading assembly and a second radial force loading assembly in an embodiment of the present invention.

[0043] Figure markings: 1-base, 2-rotational drive assembly, 21-motor, 22-speed increaser, 23-torque sensor, 3-support assembly, 31-first base, 32-second base, 321-outer frame, 322-slider, 323-guide rail, 4-axial force loading assembly, 41-first threaded member, 42-insulation ring, 43-pressure plate, 44-axial pressure sensor, 5-first radial force loading assembly, 51-second threaded member, 52-limiting plate, 53-extrusion member, 54-radial pressure sensor, 55-insulation member, 6-drive shaft, 7-first bearing, 8-second bearing, 9-mounting plate, 91-first fastener, 92-second fastener, 93-first fixing hole, 94-second fixing hole, 10-third base, 11-second radial force loading assembly, 12-adjustment assembly, 121-turntable, 122-fixing plate. DETAILED DESCRIPTION

[0044] The present invention is further described in detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

[0045] See also Figures 1 to 12 The embodiment of the present invention provides a micro-motion wear test device for a journal shoulder of a bearing mating surface, comprising a base 1 and a rotation drive assembly 2, a support assembly 3, an axial force loading assembly 4 and a first radial force loading assembly 5 arranged on the base 1; the support assembly 3 comprises two first bases 31 and a second base 32, the two first bases 31 are used to support a transmission shaft 6, a first bearing 7 is sleeved on the transmission shaft 6, and the second base 32 is arranged between the two first bases 31 and is used to support the first bearing 7; the axial force loading assembly 4 comprises a first threaded member 41, the first threaded member 41 is threadedly connected to one of the two first bases 31, and the first threaded member 41 applies an axial force to the transmission shaft 6 when rotating relative to the first base 31; the first radial force loading assembly 5 comprises a second threaded member 51, the second threaded member 51 is threadedly connected to the second base 32, and the second threaded member 51 applies a radial force to the first bearing 7 when rotating relative to the second base 32; the rotation drive assembly 2 is transmission-connected to the transmission shaft 6 to drive the transmission shaft 6 to rotate.

[0046] In some embodiments of the present application, the rotary drive assembly 2 is a rotary mechanism for driving the transmission shaft 6 to rotate, such as a motor.

[0047] In some embodiments of the present application, Figure 1 , Figure 2 and Figure 3 As shown, the base 1 includes a ground rail and a bearing plate, the bearing plate is installed on the ground rail, and the rotation drive assembly 2, the support assembly 3, the axial force loading assembly 4 and the first radial force loading assembly 5 are all installed on the bearing plate.

[0048] In the above scheme of the present application, the micro-wear testing device includes a base 1 and a rotation drive assembly 2, a support assembly 3, an axial force loading assembly 4 and a first radial force loading assembly 5 arranged on the base 1; the support assembly 3 includes two first bases 31 and a second base 32, the two first bases 31 are used to support the transmission shaft 6, the transmission shaft 6 is sleeved with a first bearing 7, and the second base 32 is arranged between the two first bases 31 and is used to support the first bearing 7; the axial force loading assembly 4 includes a first threaded member 41, the first threaded member 41 is threadedly connected to one of the two first bases 31, and the first threaded member 41 applies an axial force to the transmission shaft 6 when rotating relative to the first base 31; the first radial force loading assembly 5 includes a second threaded member 51, the second threaded member 51 is threadedly connected to the second base 32, and the second threaded member 51 applies a radial force to the first bearing 7 when rotating relative to the second base 32; the rotation drive assembly 2 is transmission-connected to the transmission shaft 6 to drive the transmission shaft 6 to rotate. With this structure, the transmission shaft 6 is supported by two first bases 31, so that the stability of the installation of the transmission shaft 6 can be improved, and the first bearing 7 is supported by the second base 32, so that the stability of the installation of the first bearing 7 can be improved. Among them, when the axial force loading component 4 applies an axial force to the transmission shaft 6, since the first bearing 7 is fixed on the second base 32, the transmission shaft 6 can apply an axial force to the inner ring of the first bearing 7, thereby simulating the working state of the first bearing 7 and the transmission shaft 6 when the axial force is applied. When the radial force loading component applies a radial force to the first bearing 7, the first bearing 7 can apply a radial force to the transmission shaft 6 in the radial direction, thereby simulating the working state of the first bearing 7 and the transmission shaft 6 when the radial force is applied. The transmission shaft 6 is driven to rotate by the rotary drive component 2, so that the transmission shaft 6 can be in a rotating state during the process of applying the load, thereby accurately simulating the load conditions in the actual use environment and improving the test accuracy. In addition, the rotary drive component 2 can apply a torsional force to the transmission shaft 6, thereby simulating the working state between the first bearing 7 and the transmission shaft 6 when the torsional force is applied. By using the axial force loading component 4, the radial force loading component and the rotary drive component 2 in combination, the test device can simulate the complex load environment in which the first bearing 7 and the transmission shaft 6 are simultaneously subjected to multiple forces such as axial force, radial force and torsional force, so that the test device can be suitable for testing and analyzing vibration and wear performance under high-speed and heavy-load operating conditions such as bending-torsion coupling, thereby improving the scope of application of the test device.

[0049] In some embodiments of the present application, Figure 4 , Figure 6 , Figure 7 , Fig. 9 and Fig.10As shown, the two first bases 31 are each provided with a bearing hole, and a second bearing 8 is provided between the transmission shaft 6 and the bearing holes of the two first bases 31. The second bearing 8 includes an inner ring and an outer ring. The inner ring of the second bearing 8 is fixed to the outer periphery of the transmission shaft 6, and the outer ring of the second bearing 8 is fixed to the inner wall of the bearing hole; the axial force loading assembly 4 also includes an insulation ring 42, a pressure plate 43, a pressure ring and an axial pressure sensor 44. The insulation ring 42 and the pressure ring are both sleeved on the outer periphery of the transmission shaft 6. The pressure plate 43, the insulation ring 42, the pressure ring and the second bearing 8 are arranged in sequence. A protrusion is provided on the pressure ring, and the protrusion and the second shaft The outer ring of the second bearing 8 is abutted, a first through hole is provided on the pressure plate 43, a first threaded hole is provided on the first base 31, the first threaded member 41 passes through the first through hole and the first threaded hole for threaded connection, a pressure block is provided on the first threaded member 41, when the first threaded member 41 rotates relative to the first base 31, the pressure block applies pressure to the pressure plate 43, the pressure plate 43 applies pressure to the outer ring of the second bearing 8 through the insulation ring 42 and the pressure ring, the inner ring of the second bearing 8 applies pressure along its axial direction to the transmission shaft 6; the axial pressure sensor 44 is arranged between the pressure block and the pressure plate 43 to detect the force applied by the first threaded member 41. With this structure, when the first threaded member 41 rotates relative to the first base 31, the pressure block of the first threaded member 41 can apply pressure to the pressure plate 43. After being subjected to the force, the pressure plate 43 can apply pressure to the insulation ring 42 and the pressure ring, so that the protrusion of the pressure ring can squeeze the outer ring of the second bearing 8. When the outer ring of the second bearing 8 is subjected to pressure, the pressure can be transmitted to the inner ring through the balls inside the bearing, and pressure is applied to the transmission shaft 6 through the inner ring, so that the axial force loading assembly 4 can apply pressure to the transmission shaft 6 along the axial direction of the transmission shaft 6.

[0050] In some embodiments of the present application, the second bearing 8 may be a tapered roller bearing.

[0051] In some embodiments of the present application, the material of the thermal insulation ring 42 may be mica thermal insulation material. Since high temperature is easily generated during the operation of the bearing, when the above-mentioned thermal insulation ring 42 is used, the thermal insulation effect of the thermal insulation ring 42 can be utilized to reduce the influence of heat on the axial pressure sensor 44, and the thermal insulation effect of thermal insulation rings 42 of various materials and models can be verified, thereby improving the scope of application of the test device.

[0052] In some embodiments of the present application, Fig.10 As shown, the inner ring of the second bearing 8 and the transmission shaft 6 are interference fit, and the outer ring of the second bearing 8 and the bearing hole are interference fit. Three shoulders are provided on the transmission shaft 6, and the three shoulders are arranged in sequence along the axial direction of the transmission shaft 6. The first shoulder is used to position the second bearing 8 close to the rotation drive component 2, the second shoulder is used to position the first bearing 7, and the third shoulder is used to position the second bearing 8 away from the rotation drive component 2.

[0053] In some embodiments of the present application, the protrusion on the pressure ring is an annular protrusion located on the end surface of the pressure ring, and the axis of the annular protrusion and the axis of the pressure ring are located on the same straight line.

[0054] In some embodiments of the present application, two ends of the transmission shaft 6 extend out through the two first bases 31 respectively.

[0055] In some embodiments of the present application, Figure 4 , Figure 6 , Figure 7 and Fig. 9 As shown, there are six first threaded members 41, six first perforations are provided on the pressure plate 43, and six first threaded holes are provided on the first base 31. The six first perforations are evenly distributed along the circumference of the pressure plate 43, and the six first threaded members 41 pass through the six first perforations and are respectively threadedly connected with the six first threaded holes; there are six axial pressure sensors 44, and the six axial pressure sensors 44 are respectively used to detect the forces applied by the six first threaded members 41; the axial force loading assembly 4 also includes six drivers, and the six drivers are respectively connected to the six first threaded members 41 to drive the six first threaded members 41 to rotate; the micro-motion wear test device also includes a controller, and the six axial pressure sensors 44 and the six drivers are all connected to the controller. The controller is used to control the actions of the six drivers according to the detection results of the six axial pressure sensors 44, so as to control the magnitude of the forces applied by the six first threaded members 41. With this structure, by adjusting the rotation angle of the first threaded member 41, the movement distance of the first threaded member 41 along the axial direction can be adjusted, and then the magnitude of the pressure applied by the first threaded member 41 to the pressure plate 43 can be adjusted. Among them, since the axial load between the transmission shaft 6 and the first bearing 7 is unevenly distributed along the circumference of the transmission shaft 6 during actual use, when the above-mentioned axial force loading component 4 is used, the six first threaded members 41 are evenly distributed along the circumference of the transmission shaft 6, and the controller controls the six driver actions respectively according to the detection results of the six axial pressure sensors 44 to respectively control the magnitude of the force applied by the six first threaded members 41 to the pressure plate 43, so that the magnitude of the force applied by each first threaded member 41 to the pressure plate 43 can be accurately controlled, and then the magnitude of the pressure at multiple positions along the circumference of the transmission shaft 6 can be accurately controlled, so that the test device can be applicable to complex load environments where there are multiple axial loads unevenly distributed along the circumference of the transmission shaft 6, further improving the scope of application of the test device. In addition, when the rotary drive component 2 drives the transmission shaft 6 to rotate, the transmission shaft 6 is loaded by the above-mentioned axial force loading component 4, which can simulate the complex load environment where the transmission shaft 6 is in a rotating state and there are multiple axial loads unevenly distributed along its circumference.

[0056] In some embodiments of the present application, Figures 1 to 4 , Figures 6 to 10As shown, two axial force loading assemblies 4 are provided, and the two axial force loading assemblies 4 are arranged opposite to each other and are respectively connected to the two first bases 31, and the two axial force loading assemblies 4 are used to apply two axial forces in opposite directions to the two sides of the transmission shaft 6. With this structure, the two axial force loading assemblies 4 can apply axial loads to the two sides of the transmission shaft 6 respectively, so that the test device can be applied to the working conditions where both sides of the transmission shaft 6 are subjected to axial loads, further improving the application scope of the test device. In addition, when there are multiple axial loads on both sides of the transmission shaft 6 that are unevenly distributed, the load distribution on both sides of the transmission shaft 6 can be accurately controlled by adjusting the rotation angle of each first threaded member 41 in the two axial force loading assemblies 4 respectively, so that the test device can be applied to the complex load environment where there are multiple axial loads on both sides of the transmission shaft 6 that are unevenly distributed.

[0057] In some embodiments of the present application, Figure 6 , Figure 7 and Figure 8 As shown, the test device also includes a mounting plate 9, a first fastener 91 and a second fastener 92. The mounting plate 9 is connected to the base 1, and two first fixing holes 93 and two second fixing holes 94 are provided on the mounting plate 9; among the two first bases 31, the first base 31 close to the rotation drive assembly 2 is fastened to the first fixing hole 93 by the first fastener 91, and the first base 31 far from the rotation drive assembly 2 is fastened to the second fixing hole 94 by the second fastener 92, and the second fixing hole 94 is an arc hole symmetrically arranged on both sides of the first base 31, and the inner concave parts of the two arc holes are arranged oppositely. In this way, the position of the first base 31 close to the rotation drive assembly 2 is fixed, and the first base 31 far from the rotation drive assembly 2 can be rotated relative to the middle position of the two second fixing holes 94 to adjust the position of the first base 31 far from the rotation drive assembly 2. Among them, in actual use, due to installation errors or long use time, there will be a small angle of deflection between the transmission shaft 6 and the first base 31, resulting in the axis of the shaft hole on the first base 31 and the axis of the transmission shaft 6 not corresponding, which in turn causes the load environment of the transmission shaft 6 and the first bearing 7 during operation to be more complicated. When the above structure is adopted, the position of the first base 31 away from the rotating drive component 2 in the arc hole can be adjusted, and the first base 31 and the mounting plate 9 can be fastened and connected by the second fastener 92, so that the first base 31 can have a small angle of deflection with the transmission shaft 6, so that the test device can simulate the above-mentioned complex load environment for testing, thereby improving the scope of application of the test device.

[0058] In some embodiments of the present application, both the first fastener 91 and the second fastener 92 may be bolts.

[0059] In some embodiments of the present application, Figure 6, Figure 7 and Fig.11 As shown, the second base 32 includes an outer frame 321 and a slider 322. The outer frame 321 is provided with a guide rail 323 extending radially along the first bearing 7. The slider 322 and the guide rail 323 are slidably connected. A positioning hole is provided in the slider 322. The inner ring of the first bearing 7 is fixed to the outer periphery of the transmission shaft 6, and the outer ring of the first bearing 7 is fixed to the hole wall of the positioning hole. The first radial force loading component 5 also includes a limit plate 52, an extrusion member 53, a radial pressure sensor 54 and a heat insulation member 55 which are arranged in sequence. The limit plate 52 and the extrusion member 53 are both fixedly connected to the second threaded member 51. The radial pressure sensor 54 and the heat insulation member 55 are both provided with a second through hole. The slider 322 is provided with a second threaded hole. The second threaded member 51 passes through the second through holes on the pressure sensor and the heat insulation member 55 in turn and is threadedly connected with the second threaded hole. A sliding groove is provided on the limit plate 52. The sliding groove and the guide rail 323 are snap-fitted. The limit plate 52 and the guide rail 323 are slidably connected. With this structure, when the second threaded member 51 rotates, the second threaded member 51 can drive the extrusion member 53 to move toward the slider 322. When the extrusion member 53 moves, it can squeeze the slider 322 through the heat insulation member 55. After the slider 322 is pressed, it applies pressure along its radial direction to the first bearing 7, so that the first radial force loading component 5 can load the first bearing 7 with radial force. The limiting cooperation between the limiting plate 52 and the guide rail 323 can make the second threaded member 51 more stable when moving. By detecting the pressure value applied by the second threaded member 51 through the radial pressure sensor 54, the magnitude of the radial force applied by the second threaded member 51 to the first bearing 7 can be accurately controlled.

[0060] In some embodiments of the present application, the outer frame 321 is fastened to the mounting plate 9 by bolts, guide rails 323 are provided on the upper and lower sides of the outer frame 321, and mounting grooves are provided on the upper and lower sides of the slider 322. The mounting grooves and the guide rails 323 are snap-fitted together, so that the slider 322 can be stably installed in the outer frame 321.

[0061] In some embodiments of the present application, the first radial force loading assembly 5 further includes a handle, the handle includes an annular member and a connecting member, one end of the connecting member is fixedly connected to the annular member, and the other end is fixedly connected to the second threaded member 51. There are multiple connecting members, and the multiple connecting members are evenly distributed along the circumference of the annular member. In this way, it is convenient for the user to manually control the first radial force loading assembly 5 to load the first bearing 7.

[0062] In some embodiments of the present application, Fig.12As shown, the test device also includes a third base 10 and a second radial force loading assembly 11, the third base 10 is connected to the base 1, the third base 10 is arranged between the first base 31 and the second base 32 and is used to support the transmission shaft 6, the second radial force loading assembly 11 includes a third threaded member, the third threaded member is threadedly connected to the third base 10, and the third threaded member applies a force along the radial direction to the transmission shaft 6 when rotating relative to the third base 10, and the first radial force loading assembly 5 and the second radial force loading assembly 11 are located on the same side or the opposite side of the transmission shaft 6. In this way, the first bearing 7 can be radially loaded by the first radial force loading assembly 5, and the transmission shaft 6 can be radially loaded by the second radial force loading assembly 11. In the actual use process, there is a situation where the first bearing 7 and the transmission shaft 6 are simultaneously subjected to radial force, and the directions of the radial force applied to the first bearing 7 and the radial force applied to the transmission shaft 6 can be the same or opposite. When the above structure is adopted, radial loads can be applied to the first bearing 7 and the transmission shaft 6 respectively through the first radial force loading assembly 5 and the second radial force loading assembly 11, so that the test device can simulate the above complex load environment and improve the application range of the test device.

[0063] In some embodiments of the present application, the second radial force loading assembly 11 has the same structure as the first radial force loading assembly 5 , the third base 10 has the same structure as the second base 32 , and a third bearing is provided between the third base 10 and the transmission shaft 6 .

[0064] In some embodiments of the present application, Figure 6 , Figure 7 and Figure 8As shown, the test device also includes a mounting plate 9 and an adjustment component 12, the first base 31 and the second base 32 are both arranged on the mounting plate 9, the adjustment component 12 includes a turntable 121, a fixed plate 122, a sliding block and a linear drive mechanism, the turntable 121 is fixedly connected to the base 1, the fixed plate 122 is rotatably connected to the turntable 121, the sliding block is slidably connected to the fixed plate 122, the linear drive mechanism is installed on the fixed plate 122 and is used to drive the sliding block to move linearly, and the mounting plate 9 is fixedly connected to the sliding block. In this way, when the transmission shaft 6 is installed, the fixed plate 122 can be controlled to rotate relative to the turntable 121 first, and then the transmission shaft 6 and the first bearing 7 can be installed on the first base 31 and the second base 32 respectively. At this time, the first bearing 7 can be installed in the positioning hole of the second base 32 first, and then the transmission shaft 6 is inserted into the first bearing 7 for installation. After that, the fixed plate 122 is controlled to rotate to the initial position relative to the turntable 121, and the sliding block is controlled to move toward the rotation drive component 2 through the linear drive mechanism, so that the transmission shaft 6 moves toward the rotation drive component 2, and finally the transmission shaft 6 and the rotation drive component 2 are connected. When the transmission shaft 6 is disassembled, the sliding block can be controlled to move away from the rotation drive component 2 through the linear drive mechanism, so that the transmission shaft 6 and the rotation drive component 2 are relatively far away, and then the fixed plate 122 can be controlled to rotate relative to the turntable 121, so that the transmission shaft 6 rotates to the disassembly position for disassembly. With this structure, the disassembly and replacement of the transmission shaft 6 and the first bearing 7 can be made more convenient.

[0065] In some embodiments of the present application, the linear drive mechanism may be a screw-nut mechanism, a gear rack mechanism, etc. The linear drive mechanism of the embodiment of the present application includes a handle and a screw, the screw and the sliding block are threadedly connected, when the handle rotates, the screw is driven to rotate, and when the screw rotates, the sliding block is driven to move linearly.

[0066] In some embodiments of the present application, Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the rotary drive assembly 2 includes a motor 21, a speed increaser 22 and a torque sensor 23 which are sequentially connected in transmission, and the torque sensor 23 is fixedly connected to the transmission shaft 6 via a coupling. With this structure, the speed increaser 22 can increase the speed output by the motor 21, so that the rotary drive assembly 2 can control the transmission shaft 6 to rotate at a high speed, and the torque sensor 23 can detect the torque of the transmission shaft 6, so that the rotary drive assembly 2 can accurately control the rotation speed of the transmission shaft 6.

[0067] In some embodiments of the present application, the motor 21 and the speed increaser 22 are connected via a coupling, and the speed increaser 22 and the torque sensor 23 are connected via a coupling.

[0068] In some embodiments of the present application, the speed increaser 22 may be a speed increaser box, which may adopt a transmission ratio of 1:3. In this way, the speed increaser box can increase the speed of 2000RPM to 6000RPM, thereby ensuring that the motor 21 can achieve a high speed under a high torque condition, and the lubricating oil in the speed increaser box is supplied in an automatic circulation manner to achieve rapid lubrication and heat dissipation of the gears in the speed increaser box, thereby ensuring that the speed increaser box can work stably for a long time.

[0069] In some embodiments of the present application, the test device further includes a speed sensor, an acceleration sensor and a temperature sensor. The speed sensor is installed on the transmission shaft 6 to detect the rotation speed of the transmission shaft 6. The acceleration sensor is installed on the transmission shaft 6 to detect the vibration frequency of the transmission shaft 6. The transmission shaft 6 includes a journal and a shoulder. The first bearing 7 is sleeved on the journal. The shoulder is used to position the first bearing 7. The temperature sensor is installed on the second base 32 to detect the temperature values ​​at the journal and the shoulder. With this structure, the rotation speed of the transmission shaft 6 is detected by the speed sensor, the vibration frequency of the transmission shaft 6 is detected by the acceleration sensor, and the temperature values ​​at the journal and the shoulder are detected by the temperature sensor, which facilitates real-time monitoring of the working state and ambient temperature of the transmission shaft 6 and improves the accuracy of the test.

[0070] In some embodiments of the present application, the temperature sensor may be an infrared temperature sensor.

[0071] In some embodiments of the present application, the test device also includes a controller, which is used to control the axial force loading component 4 and the radial force loading component to load the transmission shaft 6 and the first bearing 7 based on the detection values ​​of the speed sensor, the acceleration sensor and the temperature sensor, thereby further improving the test accuracy of the test device.

[0072] In some embodiments of the present application, the test device also includes a data acquisition instrument, which is used to collect data from various sensors and display them in real time on a display screen, so that the rotation speed and torque of the rotating shaft can be monitored in real time through the speed sensor and the torque sensor 23, and the temperature change of the shoulder and the journal during operation can be monitored in real time through the temperature sensor. When the test is completed, the wear of the journal and the shoulder at the bearing mating surface can be observed and analyzed through microscopes and other related instruments and equipment.

[0073] In the description of the present invention, it is necessary to understand that the terms "center", "axial", "circumferential", "length", "width", "thickness", "up", "down", "vertical", "horizontal", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0074] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0075] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0076] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A fretting wear test device for bearing mating surface journal shoulder, characterized in that: It comprises a base and a rotation drive assembly, a support assembly, an axial force loading assembly and a first radial force loading assembly arranged on the base; The support assembly includes two first bases and one second base, the two first bases are used to support the transmission shaft, the transmission shaft is sleeved with a first bearing, and the second base is arranged between the two first bases and is used to support the first bearing; The axial force loading assembly comprises a first threaded member, the first threaded member is threadedly connected to one of the two first bases, and the first threaded member applies an axial force to the transmission shaft when rotating relative to the first base; The first radial force loading assembly comprises a second threaded member, the second threaded member is threadedly connected to the second base, and the second threaded member applies a force in the radial direction of the first bearing when rotating relative to the second base; The rotary drive assembly is in driving connection with the transmission shaft to drive the transmission shaft to rotate; Wherein, the two first bases are each provided with a bearing hole, and a second bearing is provided between the transmission shaft and the bearing holes of the two first bases, and the second bearing comprises an inner ring and an outer ring, the inner ring of the second bearing is fixed to the outer periphery of the transmission shaft, and the outer ring of the second bearing is fixed to the inner wall of the bearing hole; The axial force loading assembly also includes an insulation ring, a pressure plate, a pressure ring and an axial pressure sensor, the insulation ring and the pressure ring are both sleeved on the outer circumference of the transmission shaft, the pressure plate, the insulation ring, the pressure ring and the second bearing are arranged in sequence, the pressure ring is provided with a protrusion, the protrusion abuts against the outer ring of the second bearing, the pressure plate is provided with a first through hole, the first base is provided with a first threaded hole, the first threaded member passes through the first through hole and is threadedly connected with the first threaded hole, a pressure block is provided on the first threaded member, when the first threaded member rotates relative to the first base, the pressure block applies pressure to the pressure plate, the pressure plate applies pressure to the outer ring of the second bearing through the insulation ring and the pressure ring, when the outer ring of the second bearing is subjected to pressure, it drives the inner ring of the second bearing to apply pressure along its axial direction to the transmission shaft; The axial pressure sensor is arranged between the pressing block and the pressing plate to detect the force applied by the first screw member; Wherein, there are six first threaded members, six first through holes are provided on the pressing plate, six first threaded holes are provided on the first base, the six first through holes are evenly distributed along the circumference of the pressing plate, and the six first threaded members respectively pass through the six first through holes and are respectively threadedly connected with the six first threaded holes; There are six axial pressure sensors, and the six axial pressure sensors are used to detect the forces applied by the six first screw members respectively; The axial force loading assembly further includes six drivers, and the six drivers are respectively connected to the six first threaded members to respectively drive the six first threaded members to rotate; The micro-wear testing device also includes a controller, and the six axial pressure sensors and the six drivers are all connected to the controller. The controller is used to control the actions of the six drivers respectively according to the detection results of the six axial pressure sensors, so as to respectively control the magnitude of the force applied by the six first threaded members.

2. The fretting wear test device for the journal shoulder of the bearing mating surface according to claim 1 is characterized in that: There are two axial force loading assemblies, which are arranged opposite to each other and respectively connected to the two first bases. The two axial force loading assemblies are used to apply two axial forces in opposite directions to both sides of the transmission shaft respectively.

3. The fretting wear test device for the journal shoulder of the bearing mating surface according to claim 1 is characterized in that: It also includes a mounting plate, a first fastener and a second fastener, wherein the mounting plate is connected to the base, and the mounting plate is provided with two first fixing holes and two second fixing holes; Among the two first bases, the first base close to the rotation drive component and the first fixing hole are fastened together by the first fastener, and the first base far from the rotation drive component and the second fixing hole are fastened together by the second fastener, and the second fixing holes are arc holes symmetrically arranged on both sides of the first base, and the inner recesses of the two arc holes are arranged opposite to each other.

4. The fretting wear test device for the journal shoulder of the bearing mating surface according to claim 1 is characterized in that: The second base includes an outer frame and a slider, the outer frame is provided with a guide rail extending along the radial direction of the first bearing, the slider is slidably connected to the guide rail, a positioning hole is provided in the slider, the inner ring of the first bearing is fixed to the outer periphery of the transmission shaft, and the outer ring of the first bearing is fixed to the hole wall of the positioning hole; The first radial force loading assembly further includes a stop plate, an extrusion member, a radial pressure sensor and a heat insulating member which are sequentially arranged, the stop plate and the extrusion member are both fixedly connected to the second threaded member, the radial pressure sensor and the heat insulating member are both provided with a second through hole, the slider is provided with a second threaded hole, the second threaded member sequentially passes through the second through holes on the pressure sensor and the heat insulating member and is threadedly connected to the second threaded hole; The limiting plate is provided with a sliding groove, the sliding groove and the guide rail are engaged with each other, and the limiting plate and the guide rail are slidably connected.

5. The fretting wear test device for the journal shoulder of the bearing mating surface according to claim 4 is characterized in that: It also includes a third base and a second radial force loading assembly, the third base is connected to the base, the third base is arranged between the first base and the second base and is used to support the transmission shaft, the second radial force loading assembly includes a third threaded member, the third threaded member is threadedly connected to the third base, the third threaded member applies a radial force to the transmission shaft when rotating relative to the third base, and the first radial force loading assembly and the second radial force loading assembly are located on the same side or different sides of the transmission shaft.

6. The fretting wear test device for the journal shoulder of the bearing mating surface according to claim 1 is characterized in that: It also includes a mounting plate and an adjustment component, the first base and the second base are both arranged on the mounting plate, the adjustment component includes a turntable, a fixed plate, a sliding block and a linear drive mechanism, the turntable and the base are fixedly connected, the fixed plate and the turntable are rotatably connected, the sliding block and the fixed plate are slidably connected, the linear drive mechanism is installed on the fixed plate and is used to drive the sliding block to move linearly, and the mounting plate and the sliding block are fixedly connected.

7. The fretting wear test device for the journal shoulder of the bearing mating surface according to claim 1 is characterized in that: The rotary drive assembly includes a motor, a speed increaser and a torque sensor which are sequentially connected in transmission, and the torque sensor and the transmission shaft are fixedly connected via a coupling.

8. The fretting wear test device for the journal shoulder of the bearing mating surface according to claim 1 is characterized in that: It also includes a speed sensor, an acceleration sensor and a temperature sensor. The speed sensor is installed on the transmission shaft to detect the rotation speed of the transmission shaft. The acceleration sensor is installed on the transmission shaft to detect the vibration frequency of the transmission shaft. The transmission shaft includes a journal and a shoulder. The first bearing is sleeved on the journal. The shoulder is used to position the first bearing. The temperature sensor is used to detect the temperature values ​​at the journal and the shoulder.

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