Bearing clearance measuring device

Abstract

The utility model provides a bearing clearance measuring device, and relates to the technical field of bearing detection. The measuring device comprises a fixed mechanism and a movable mechanism. The fixing mechanism comprises a base and a pressing assembly. A positioning through hole is formed in the base, and a step face used for abutting against a bearing outer ring is arranged on the inner wall face of the positioning through hole. The pressing assembly is detachably connected to the base and used for pressing the upper end face of a bearing outer ring. The movable mechanism comprises an upper pressing piece and a lower pressing piece which are coaxially arranged in the axial direction of the positioning through hole, the upper pressing piece is arranged on the upper portion of the positioning through hole and presses the upper end face of the bearing inner ring, and the lower pressing piece is arranged on the lower portion of the positioning through hole and presses the lower end face of the bearing inner ring. According to the bearing clearance measuring device, the spatial position of the bearing during working is simulated, it is guaranteed that the inner ring and the outer ring of the bearing are kept concentric during measurement, and the measurement accuracy is improved.

Description

Technical Field

[0001] This application relates to the technical field of bearing measurement, and particularly to a bearing clearance measurement device. Background Art

[0002] When a railway locomotive undergoes high-level repair, the main gear bearing needs to be replaced. However, a large number of practices have shown that since the original clearance of the bearing when leaving the factory does not meet the loading standard, the clearance of the assembled bearing often fails to meet the process requirements, thus affecting the subsequent production progress. Therefore, it is urgent to measure the axial clearance of the bearing before assembly and select the bearing.

[0003] In the existing bearing axial clearance detection methods, usually, the outer ring (or inner ring) of the bearing is axially fixed, and the inner ring (or outer ring) is manually toggled to uniformly and alternately apply an axial load to it, so that the inner ring (or outer ring) of the bearing moves axially, and then the axial clearance of the bearing is read from the measuring instrument.

[0004] However, when using the existing measurement methods, the spatial position of the bearing during operation is ignored, and the concentricity of the inner and outer rings of the bearing is not ensured, which easily affects the measurement accuracy. Utility Model Content

[0005] This application provides a bearing clearance measurement device, which can simulate the spatial position of the bearing during operation during measurement and ensure the concentricity of the inner and outer rings of the bearing, improving the accuracy of bearing clearance measurement.

[0006] This application provides a bearing clearance measurement device for detecting the axial clearance of a bearing. The bearing includes a bearing outer ring and a bearing inner ring. The measurement device includes: a fixing mechanism, including a base and a pressing component; the base is provided with a positioning through hole, and a stepped surface for the bearing outer ring to abut against is provided on the inner wall surface of the positioning through hole; the pressing component is detachably connected to the base, and the pressing component is used to press the upper end surface of the bearing outer ring.

[0007] A movable mechanism, including an upper pressing member and a lower pressing member coaxially arranged along the axis of the positioning through hole. The upper pressing member is arranged at the upper part of the positioning through hole and presses the upper end surface of the bearing inner ring, and the lower pressing member is arranged at the lower part of the positioning through hole and presses the lower end surface of the bearing inner ring.

[0008] In a possible implementation manner, the cross-section of the upper pressing member is an inverted trapezoid. From the end of the upper pressing member facing away from the lower pressing member to the end of the upper pressing member facing the lower pressing member, the outer side wall of the upper pressing member inclines towards the center of the upper pressing member.

[0009] The cross-section of the lower pressing member is a regular trapezoid. From the end of the lower pressing member facing away from the upper pressing member to the end of the lower pressing member facing the upper pressing member, the outer side wall of the lower pressing member inclines towards the center of the lower pressing member.

[0010] In a possible implementation, the movable mechanism further includes an open snap ring disposed within the positioning through hole. The outer sidewall of the open snap ring abuts against the inner sidewall of the bearing inner ring, and the two end faces of the open snap ring are flush with the two end faces of the bearing inner ring respectively. Among them, the upper pressing member and the lower pressing member are respectively pressed against the upper and lower sides of the open snap ring.

[0011] In a possible implementation, one of the upper pressing member and the lower pressing member is connected with a central shaft, and the other of the upper pressing member and the lower pressing member is provided with a central hole, and the central shaft passes through the central hole.

[0012] In a possible implementation, a first fastener is sleeved on the central shaft, and the first fastener presses the end face of the one of the upper pressing member and the lower pressing member provided with the central hole.

[0013] In a possible implementation, the movable mechanism further includes a support frame, which includes a support plate and a plurality of support columns. The support plate is located above the base, and each support column is connected to the surface of the support plate facing the base. The support columns are arranged at intervals along the circumferential direction of the support plate and pass through the base.

[0014] In a possible implementation, the lower pressing member is connected with a central shaft, and the central shaft passes through the support plate to connect the lower pressing member with the support frame.

[0015] In a possible implementation, a second fastener is further sleeved on the central shaft, and the second fastener presses the two side plates of the support plate.

[0016] In a possible implementation, the pressing assembly includes a plurality of pressing seats, which are arranged at intervals along the circumferential direction of the base, and each pressing seat presses the upper end face of the bearing outer ring.

[0017] In a possible implementation, the pressing assembly further includes a plurality of third fasteners, and each third fastener passes through each pressing seat respectively to fix the pressing seat to the base.

[0018] A bearing clearance measuring device provided by the present application is used to detect the axial clearance of a bearing. The measuring device specifically includes a fixing mechanism and a movable mechanism. The fixing mechanism includes a base and a pressing assembly. A positioning through hole is formed in the base, and a stepped surface for the outer ring of the bearing to abut against is provided on the inner wall surface of the positioning through hole. The pressing assembly is detachably connected to the base, and the pressing assembly is used to press the upper end surface of the outer ring of the bearing, so as to limit the movement of the outer ring of the bearing through the setting of the fixing mechanism. The movable mechanism includes an upper pressing member and a lower pressing member coaxially arranged along the axis of the positioning through hole. The upper pressing member is arranged at the upper part of the positioning through hole and presses the upper end surface of the inner ring of the bearing, and the lower pressing member is arranged at the lower part of the positioning through hole and presses the lower end surface of the inner ring of the bearing. By restricting the outer ring of the bearing to abut against the stepped surface provided on the inner wall surface of the positioning through hole, and at the same time pressing the upper and lower end surfaces of the inner ring of the bearing from the upper and lower directions by the upper and lower pressing members coaxially arranged with the positioning through hole, the spatial position of the bearing during operation can be simulated, ensuring the coaxiality of the inner and outer rings of the bearing. When the inner ring of the bearing is composed of two identical inner rings spliced together, the concentricity of the upper and lower inner rings can also be ensured, thereby improving the accuracy of bearing clearance measurement. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0020] Figure 1 Stereoscopic structure diagram of the bearing clearance measuring device provided by the embodiment of the present application;

[0021] Figure 2 Exploded structure diagram of the bearing clearance measuring device provided by the embodiment of the present application;

[0022] Figure 3 Structure diagram of the bearing clearance measuring device provided by the embodiment of the present application from one perspective;

[0023] Figure 4 For Figure 3 Partial cross-sectional view of the bearing clearance measuring device in along line A-A;

[0024] Figure 5 For Figure 4 Partial enlarged view at B in ;

[0025] Figure 6 Structure diagram of the bearing clearance measuring device provided by the embodiment of the present application from another perspective.

[0026] Explanation of the reference numerals:

[0027] 100, movable mechanism; 110, upper clamping member; 120, lower clamping member; 130, open snap ring; 140, center axis; 150, center hole; 160, first fastener; 170, support frame; 171, support plate; 172, support column; 173, first through hole; 180, second fastener;

[0028] 200, fixing mechanism; 210, base; 211, positioning through hole; 2111, step surface; 212, limiting hole; 213, mounting hole; 220, pressing assembly; 221, pressing seat; 2211, vertical part; 2212, horizontal part; 222, third fastener;

[0029] 300, bearing; 310, bearing inner ring; 311, upper inner ring; 312, lower inner ring; 320, bearing outer ring; 330, rolling element. DETAILED DESCRIPTION

[0030] When the running mileage of my country's railway locomotives on the railway trunk lines reaches 1 million kilometers, they need to undergo a high-level maintenance process, that is, disassembly and maintenance of the main components of the locomotive, performance parameter testing, and restoration of the locomotive's reliable quality status.

[0031] For example, when the HXD3D electric locomotive is overhauled, the main gear bearing needs to be replaced. Since the main and slave gears of the HXD3D drive device are driven by helical gears, the axial force of the driving gear is generated, so the bearing to be installed needs to bear the axial force generated by the driving gear. After the main gear bearing is assembled, the main gear axial bearing clearance must be between 0.10-0.21mm, and this clearance is mainly guaranteed by the bearing to be installed.

[0032] In actual production, although bearings are standard parts, the inherent clearance of each bearing is different. A large number of practices have shown that during production and assembly, the original clearance of the bearings does not meet the loading standard, which often causes the axial clearance of the driving gear after assembly to fail to meet the process requirements, requiring disassembly and reassembly, which seriously affects the production progress.

[0033] In the existing bearing axial clearance detection method, the outer ring (or inner ring) of the bearing is usually fixed axially, the inner ring (or outer ring) is manually moved, and an axial load is evenly and alternately applied to it, so that the inner ring (or outer ring) of the bearing moves axially, and then the axial clearance of the bearing is read from a measuring instrument.

[0034] However, the existing measurement methods ignore the spatial position of the bearing during operation and do not ensure that the inner and outer rings of the bearing are concentric, which can easily affect the accuracy of the measurement and subsequently affect the subsequent production progress.

[0035] In view of this, an embodiment of the present application provides a bearing clearance measuring device for detecting the axial clearance of a bearing. The measuring device specifically includes: a fixing mechanism and a movable mechanism. The fixing mechanism includes a base and a pressing assembly. A positioning through hole is formed in the base, and a stepped surface for the outer ring of the bearing to abut against is provided on the inner wall surface of the positioning through hole. The pressing assembly is detachably connected to the base, and the pressing assembly is used to press the upper end surface of the outer ring of the bearing, so as to limit the movement of the outer ring of the bearing through the setting of the fixing mechanism; the movable mechanism includes an upper pressing member and a lower pressing member coaxially arranged along the axis of the positioning through hole. The upper pressing member is arranged at the upper part of the positioning through hole and presses the upper end surface of the inner ring of the bearing, and the lower pressing member is arranged at the lower part of the positioning through hole and presses the lower end surface of the inner ring of the bearing.

[0036] By restricting the outer ring of the bearing to abut against the stepped surface provided on the inner wall surface of the positioning through hole, and at the same time pressing the upper and lower end surfaces of the inner ring of the bearing from the upper and lower directions by the upper and lower pressing members coaxially arranged with the positioning through hole, the relative spatial position during the operation of the bearing can be simulated, ensuring that the inner and outer rings of the bearing are coaxial. When the inner ring of the bearing is composed of two identical inner rings spliced together, the concentricity of the upper and lower inner rings can also be ensured, thereby improving the accuracy of bearing clearance measurement.

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0038] Figure 1 It is a three-dimensional structure diagram of the bearing clearance measuring device provided by the embodiment of the present application. Figure 2 It is an exploded structure diagram of the bearing clearance measuring device provided by the embodiment of the present application. Figure 3 It is a structure diagram of the bearing clearance measuring device provided by the embodiment of the present application from a perspective.

[0039] Referring to Figures 1 to 3 As shown, an embodiment of the present application provides a bearing clearance measuring device, which is used to detect the axial clearance of a bearing. A bearing is an important component in fields such as metallurgy, wind power, mining machinery, aerospace, and automotive parts. It is mainly used to support a rotating machine body, reduce the friction coefficient during its movement, and ensure its rotational accuracy. Bearings are usually divided into two categories, namely rolling bearings and sliding bearings. The solution of the present application mainly measures the axial clearance of rolling bearings.

[0040] Specifically, as Figure 2 and Figure 4As shown in the figure, a rolling bearing generally consists of four parts: an inner ring 310, an outer ring 320, rolling elements 330, and a cage (not shown). The function of the inner ring 310 of the bearing is to cooperate with the shaft and rotate together with the shaft; the function of the outer ring 320 of the bearing is to cooperate with the bearing housing and play a supporting role; the rolling elements 330 are evenly distributed between the inner ring 310 and the outer ring 320 of the bearing with the help of the cage, and their shape, size, and quantity directly affect the service performance and life of the rolling bearing; the cage can evenly distribute the rolling elements 330, guide the rolling elements 330 to rotate, and play a lubricating role.

[0041] Bearing clearance is the clearance between the rolling elements of the bearing and the inner and outer rings of the bearing. The so-called bearing clearance refers to the amount of movement when one of the inner or outer rings of the bearing is fixed and the unfixed side of the bearing clearance is moved radially or axially without the bearing being installed on the shaft or bearing housing. According to the moving direction, it can be divided into radial clearance and axial clearance. The size of the clearance during operation (referred to as the working clearance) affects the performance of the bearing such as rolling fatigue life, temperature rise, noise, and vibration.

[0042] Taking railway locomotive equipment as an example, the main gearbox in a railway locomotive is an important part of the railway locomotive. When helical gears are used for the main and driven gears, an axial component force will be generated on the driving gear. At this time, the axial component force of the driving gear needs to be borne by the bearing, and the axial clearance of the main gear bearing needs to be ensured to be between 0.10 - 0.21 mm.

[0043] However, the existing method for measuring bearing clearance usually fixes the outer ring (or inner ring) of the bearing axially, manually rotates the inner ring (or outer ring), and evenly and alternately applies axial loads to it to make the inner ring (or outer ring) of the bearing move axially, and then reads the axial clearance of the bearing from the measuring instrument. This method ignores the spatial position of the bearing during operation, and it is impossible to ensure the concentricity of the inner and outer rings of the bearing when manually rotating the inner ring (or outer ring), which easily affects the measurement accuracy and causes deviation in the results.

[0044] In the actual production of railway locomotives, it often happens that the original clearance of the bearing when leaving the factory does not meet the loading standard, resulting in the axial clearance of the driving gear after subsequent assembly not meeting the process requirements, so the whole needs to be disassembled and reassembled, seriously affecting the production progress.

[0045] In response to this, the bearing clearance measuring device provided in this embodiment can be applied to railway locomotive equipment to detect the axial clearance of the bearing, so as to avoid affecting the subsequent production accuracy due to the axial clearance of the bearing not meeting the loading standard.

[0046] Continue to refer to Figure 1 、 Figure 2 and Figure 3, the bearing clearance measuring device provided in this embodiment includes a fixing mechanism 200 and a movable mechanism 100. The fixing mechanism 200 can be fixed on a workbench, an operating table, a placement rack or a detection rack, and is used to keep the fixing mechanism 200 stable and parallel to the horizontal plane, which is not specifically limited here. The movable mechanism 100 is coaxially arranged with the fixing mechanism 200 and can move up and down along the axis direction of the fixing mechanism 200.

[0047] Specifically, the fixing mechanism 200 may include a base 210. The base 210 is provided with a positioning through hole 211, and the movable mechanism 100 can pass through the positioning through hole 211 and move up and down relative to the axis direction of the fixing mechanism 200. A stepped surface 2111 (see Figure 4 shown) for the outer ring 320 of the bearing to abut against is provided on the inner wall surface of the positioning through hole 211. The bottom surface of the stepped surface 2111 abuts against the lower end surface of the outer ring 320 of the bearing, and the side wall of the stepped surface 2111 abuts against the outer wall of the outer ring 320 of the bearing to limit the movement of the outer ring 320 of the bearing in the relevant direction.

[0048] The fixing mechanism 200 may further include a pressing assembly 220. The pressing assembly 220 is detachably connected to the base 210, and the pressing assembly 220 is used to press the upper end surface of the outer ring of the bearing; the connection method between the pressing assembly 220 and the base 210 may be bolt connection, snap connection or hinge connection, etc., which is not specifically limited here. By pressing the upper end surface of the outer ring 320 of the bearing with the pressing assembly 220 and the stepped surface 211 on the positioning through hole 211 in the base 210 abuts against the outer ring 320 of the bearing, the fixing of the outer ring 320 of the bearing on the base 210 can be realized.

[0049] The movable mechanism 100 may include an upper pressing member 110 and a lower pressing member 120 coaxially arranged along the axial direction of the positioning through hole 211. The upper pressing member 110 is arranged at the upper part of the positioning through hole 211 and presses the upper end surface of the inner ring 310 of the bearing, and the lower pressing member 120 is arranged at the lower part of the positioning through hole 211 and presses the lower end surface of the inner ring 310 of the bearing.

[0050] Specifically, the inner ring 310 of the bearing may be composed of a single inner ring. Or, the inner ring 310 of the bearing may also be jointly spliced by two upper and lower inner rings with the same structure, and may include an upper inner ring 311 and a lower inner ring 312 (see Figure 5 shown), such as QJ220 type ball bearing. It is not specifically limited here.

[0051] The movable mechanism 100 compresses the upper end face and the lower end face of the inner ring 310 of the bearing respectively through the upper pressing member 110 and the lower pressing member 120 coaxially arranged along the axial direction of the positioning through hole 211, fixes the inner ring 310 of the bearing together with the upper pressing member 110 and the lower pressing member 120, ensures the coaxial arrangement of the inner ring 310 of the bearing and the outer ring 320 of the bearing, simulates the spatial position during the movement of the bearing 300, and thus improves the accuracy of the subsequent measurement of the axial clearance of the bearing.

[0052] Among them, the upper pressing member 110 and the lower pressing member 120 can be coaxially arranged by connecting with the same center axis. For example, both the upper pressing member 110 and the lower pressing member 120 are provided with central positioning holes, and the two are sleeved on the same axis through the central positioning holes. Or, one of the upper pressing member 110 and the lower pressing member 120 is connected with a central axis, and the other is provided with a central positioning hole. By passing the central axis through the central positioning hole, the coaxial fit of the two is realized. In addition, the upper pressing member 110 and the lower pressing member 120 can also be coaxially arranged through other connecting frames arranged coaxially, and the connection method thereof is not specifically limited herein.

[0053] Optionally, the specific connection method of the upper and lower pressing members can be that one of the upper pressing member 110 and the lower pressing member 120 is connected with a central axis 140, and the other of the upper pressing member 110 and the lower pressing member 120 is provided with a central hole 150, and the central axis 140 passes through the central hole 150.

[0054] Through the cooperation of the central hole 150 and the central axis 140 and the fixed connection of one of them with the central axis 140, the coaxial arrangement of the upper pressing member 110 and the lower pressing member 120 can be realized, which is simple to manufacture and convenient for disassembly and assembly.

[0055] Specifically, when the inner ring 310 of the bearing is jointly spliced by the upper inner ring 311 and the lower inner ring 312 (see Figure 5 shown), when using the traditional bearing clearance measurement method, that is, manually applying an axial force to the inner ring, due to uneven force and the position of the force application point, the two half rings may be misaligned, and then they are not concentric, affecting the accuracy of the subsequent detection. And through the upper pressing member 110 and the lower pressing member 120 coaxially arranged along the axial direction of the positioning through hole 211 adopted in the present application, the upper inner ring 311 and the lower inner ring 312 of the inner ring 310 of the bearing can be tightened from the upper and lower end faces, so that the upper inner ring 311 and the lower inner ring 312 are both pressed towards the middle, realizing the concentric arrangement of the upper inner ring 311 and the lower inner ring 312.

[0056] Refer to Figure 3As shown, in some embodiments, the cross-section of the upper pressing member 110 is an inverted trapezoid. From the end of the upper pressing member 110 facing away from the lower pressing member 120 to the end of the upper pressing member 110 facing the lower pressing member 120, the outer sidewall of the upper pressing member 110 inclines towards the center of the upper pressing member 110.

[0057] The cross-section of the lower pressing member 120 is a regular trapezoid. From the end of the lower pressing member 120 facing away from the upper pressing member 110 to the end of the lower pressing member 120 facing the upper pressing member 110, the outer sidewall of the lower pressing member 120 inclines towards the center of the lower pressing member 120.

[0058] By setting the upper pressing member 110 and the lower pressing member 120 as relative inverted trapezoid and regular trapezoid structures, it is more convenient for the upper pressing member 110 and the lower pressing member 120 to cooperate with the positioning through-hole 211 and press the inner ring 310 of the bearing. At the same time, since the outer sidewalls of the upper pressing member 110 and the lower pressing member 120 incline towards their own centers at the ends facing each other, it also facilitates the movement of the entire movable mechanism 100 on the axis during force application, and avoids interference between the upper pressing member 110 and the lower pressing member 120 and the positioning through-hole 211 in the base 210 when moving up and down along the axis.

[0059] Optionally, the slopes of the upper pressing member 110 and the lower pressing member 120 can be the same, and the cross-sectional shapes and dimensions of the two can be exactly the same, which is convenient for manufacturing.

[0060] Optionally, since the upper pressing member 110, the lower pressing member 120 and the inner ring 310 of the bearing are in rigid contact during measurement, anti-wear materials can be attached to the outer walls of the upper pressing member 110 and the lower pressing member 120, or removable anti-wear parts, such as rubber layers, can be attached to the inner wall of the inner ring 310 of the bearing to avoid rigid damage to the inner ring of the bearing during measurement.

[0061] Figure 4 For Figure 3 the partial cross-sectional view of the bearing clearance measuring device in along the line A-A. Figure 5 For Figure 4 the partial enlarged view at B in .

[0062] See Figure 4 and Figure 5 As an embodiment, the movable mechanism 100 further includes an open circlip 130. The open circlip 130 is arranged in the positioning through-hole 211. The outer sidewall of the open circlip 130 is closely attached to the inner sidewall of the inner ring 310 of the bearing, and the two end faces of the open circlip 130 are flush with the two end faces of the inner ring 310 of the bearing respectively;

[0063] Wherein, the upper pressing member 110 and the lower pressing member 120 are respectively pressed on the upper and lower sides of the open circlip 130.

[0064] Through the above-mentioned setting of the split retaining ring 130, the rigid contact between the upper pressing member 110 and the lower pressing member 120 and the inner ring 310 of the bearing can be transformed into the pressing on both the upper and lower sides of the inner ring 310 of the bearing through the split retaining ring 130, avoiding abrasion or damage to the inner wall of the inner ring 310 of the bearing. At the same time, the pressing force generated by pressing the upper pressing member 110 and the lower pressing member 120 on the upper and lower sides of the split retaining ring 130 respectively is transmitted to the inner ring 310 of the bearing, further pressing the upper inner ring 311 and the lower inner ring 312 by the split retaining ring 130 flush with the two end faces of the inner ring 310 of the bearing, so that the upper inner ring 311 and the lower inner ring 312 can remain concentric.

[0065] As an implementation manner, the split retaining ring 130 can select a square plate flush with the two end faces of the inner ring 310 of the bearing as the initial structure. By bending the square plate into a cylindrical structure adapted to the size of the inner ring 310 of the bearing, the split retaining ring 130 can be obtained.

[0066] As another implementation manner, the middle of the split retaining ring 130 can be a partition plate, with opening grooves formed on both sides. The opening grooves can be trapezoidal grooves matching the pressing member. The split retaining ring 130 and the inner ring 310 of the bearing can be in clearance fit, and no specific limitation is made here.

[0067] Furthermore, a first fastener 160 is sleeved on the central shaft 140, and the first fastener 160 presses the end face of one of the upper pressing member 110 and the lower pressing member 120 provided with the central hole 150.

[0068] With such a setting, the first fastener 16 can provide a fastening force for one of the upper pressing member 110 and the lower pressing member 120 provided with the central hole 150. By providing a pressing force to any one of the upper pressing member 110 or the lower pressing member 120 through the first fastener 16, and then converting it into a pressing force along the radial direction of the inner ring of the bearing through the cooperation between the outer contour of one of the upper pressing member 110 or the lower pressing member 120 and the split retaining ring 130, finally, the corresponding part of the inner ring of the bearing is pressed. Correspondingly, one of the upper pressing member 110 and the lower pressing member 120 connected to the central shaft 140 can directly press the split retaining ring 130 on the inner ring 310 of the bearing by the extrusion of the cooperation between its outer contour shape and the split retaining ring 130.

[0069] It should be noted that the first fastener 16 can be set as a fastening nut to provide a fastening force for the one provided with the central hole, and no specific limitation is made here.

[0070] Specifically, refer to Figure 2 and Figure 3As shown, the upper pressing member 110 is provided with a central hole 150, the lower pressing member 120 is connected with a central shaft 140, the upper pressing member 110 is sleeved on the central shaft 140, and the upper side of the snap ring 130 is pressed by the first fastener 160, a compression nut.

[0071] Furthermore, the upper pressing block 110 can symmetrically form grooves on its side wall. With such a setting, it is convenient for the placement of measuring instruments (such as micrometers or calipers) when measuring the axial distance of the inner ring of the bearing subsequently. The measuring instrument can be placed in the groove to measure the axial clearance generated by the inner ring of the bearing without interfering with the upper pressing block 110.

[0072] In the embodiment of the present application, by applying a uniform axial force to the central shaft 140, the central shaft 140 can drive the upper pressing member 110, the lower pressing member 120, the snap ring 130, and the inner ring 310 of the bearing to generate an axial displacement relative to the outer ring 320 of the bearing, so that the axial clearance of the bearing can be measured.

[0073] Optionally, as Figures 1 to 3 shown, the movable mechanism 100 further includes a support frame 170. The support frame 170 includes a support plate 171 and a plurality of support columns 172. The support plate 171 is located above the base 210, and each support column 172 is connected to the surface of the support plate 171 facing the base 210. The support columns 172 are arranged at intervals along the circumferential direction of the support plate 171 and pass through the base 210.

[0074] Specifically, the base 210 is correspondingly provided with a plurality of limiting holes 212. The plurality of limiting holes 212 correspond one-to-one to the plurality of support columns 172 arranged at intervals along the circumferential direction on the support plate 171, and each support column 172 passes through each limiting hole 212 provided on the base 210. The support plate 171 can be set as a circular plate or a square plate, and no specific limitation is made on its shape here. Exemplarily, three support columns 172 can be provided and three limiting holes 212 can be correspondingly provided on the base 210 to ensure its stability.

[0075] With such a setting, since the plurality of support columns 172 connected to the support plate 171 are limited by the plurality of limiting holes 212 provided on the base 210, the support frame 170 can only move in the up and down direction and is not prone to overturn in the horizontal direction, and at the same time, the stability of the base 210 is also improved.

[0076] Among them, the lower pressing member 120 is connected to a central shaft 140. The central shaft 140 is connected to the upper surface of the lower pressing member 120 and extends towards the upper pressing member 110. A central hole 150 is provided on the upper pressing member 110. The central shaft 140 of the lower pressing member 120 passes through the central hole 150 of the upper pressing member 110 to realize the coaxial connection between the upper pressing member 110 and the lower pressing member 120. At this time, the central shaft 140 passes through the support plate 171 to connect the upper pressing member 110, the lower pressing member 120 and the support frame 170.

[0077] It should be noted that the connection mode between the central shaft 140 and the support frame 170 can be a non-detachable connection, such as welding, bonding, hemming connection, riveting connection; or a detachable connection, such as bolt connection, threaded connection, snap connection, hinge connection, key connection or pin connection.

[0078] Furthermore, a second fastener 180 is also sleeved on the central shaft 140. The second fastener 180 presses both side plates of the support plate 171. Specifically, a first through hole 173 is provided at the center of the support plate 171. The central shaft 140 passes through the first through hole 173, and the fixed connection between the central shaft 140 and the support plate 171 is realized through the second fasteners 180 arranged on both sides of the plate surface. Specifically, the second fastener 180 can be a fastening nut.

[0079] With such a setting, by introducing the support frame 170 connected to the central shaft 140, the upper pressing member 110 and the lower pressing member 120 on the central shaft 140 are connected to the support frame 170 as a whole. Compared with the central shaft 140, the support frame 170 has a larger contact area. The operator can directly apply force evenly to the support plate 171 to drive the entire movable mechanism 100 to move along the axis, which is more convenient for measurement operations. In addition, since the support frame 170 is provided with a plurality of support columns 172 arranged at intervals along the circumference of the support plate 171, it can also ensure that when the entire movable mechanism 100 has an axial displacement, it will not tip over in the horizontal direction, thereby further improving the concentricity between the inner ring 310 and the outer ring 320 of the bearing and making the measurement result more accurate.

[0080] Figure 6 This is a schematic structural diagram of the bearing clearance measuring device provided by the embodiment of the present application from another perspective;

[0081] Optionally, as Figure 6 shown, the pressing assembly 220 includes a plurality of pressing seats 221. The pressing seats 221 are arranged at intervals along the circumference of the base 210, and each pressing seat 221 presses the upper end surface of the outer ring 320 of the bearing. With such a setting, the stability of the outer ring 320 of the bearing can be further ensured, that is, when the inner ring 310 of the bearing has an axial displacement relative to the outer ring 320 of the bearing, the outer ring 320 of the bearing will not tip over, pry, or change its position.

[0082] Optionally, the pressing assembly 220 further includes a plurality of third fasteners 222, and each third fastener 222 passes through each pressing seat 221 respectively to fix the pressing seat 221 to the base 210. The third fastener 222 may include a bolt and a pressing nut.

[0083] Specifically, the pressing seat 221 may include a vertical portion 2211 and a horizontal portion 2212 (as shown in the reference Figure 4 figure), the vertical portion 2211 is erected on the surface of the base 210, the horizontal portion 2212 is connected to the upper end of the vertical portion 2211 and extends towards the bearing 300, the horizontal portion 2212 presses against the outer ring 320 of the bearing, and the third fastener 222 can pass through the vertical portion 2211. With such a setting, the detachable connection between the vertical portion 2211 and the base 210 can be realized, and when the fastening nut is loosened alone, the pressing seat 221 can rotate around the axis of the third fastener 222 to facilitate the installation and disassembly of the outer ring 320 of the bearing during measurement. In addition, the pressing is realized through the horizontal portion 2212, so the vertical portion 2211 may not contact the outer ring 320 of the bearing, that is, it will not cause damage to the outer surface of the outer ring 320 of the bearing. Optionally, an anti-wear material may be provided on the horizontal portion 2212 in contact with the outer ring 320 of the bearing to reduce the wear on the outer ring 320 of the bearing.

[0084] As an implementation manner, a plurality of mounting holes 213 corresponding to the plurality of pressing seats 221 one by one and allowing the third fastener 222 to pass through are provided on the base 210, so as to realize the detachable connection between the vertical portion 2211 of the pressing seat 221 and the base 210.

[0085] Exemplarily, the bearing clearance measuring device may further include a measuring instrument (not shown), the measuring instrument is vertically arranged on and in contact with the inner ring 320 of the bearing, and the measuring instrument is used to measure the displacement generated by the inner ring 320 of the bearing in the first direction; or, the measuring instrument may be vertically arranged on and in contact with the support plate 172, and the measuring instrument is used to measure the displacement generated by the support plate 172 in the first direction.

[0086] It should be noted that the above-mentioned first direction is the axial direction along the positioning through hole 211.

[0087] The using method of the bearing clearance measuring device provided by the embodiment of the present application is as follows:

[0088] 1. Fix the outer ring 320 of the bearing to the fixing mechanism 200 of the measuring device;

[0089] 2. Pre-assemble the inner ring 310 of the bearing on the outer ring 320 of the bearing, and fix the inner ring 310 of the bearing to the movable mechanism 100 of the measuring device, and the movable mechanism 100 can move relative to the fixing mechanism 200 in the first direction;

[0090] 3. Apply an axial load to the movable mechanism 100 and measure the axial displacement of the bearing inner ring 310 or the movable mechanism 100 to obtain the bearing axial clearance.

[0091] The above step 1 may specifically include:

[0092] First, the bearing outer ring 320 is placed on the step surface set on the positioning through hole 211 in the base 210, and then fixed on the base 210 through the clamping assembly 220, that is, through three clamping seats 221 and the corresponding third fasteners 222.

[0093] The above step 2 may specifically include:

[0094] Then the bearing inner ring 310 is pre-installed on the bearing outer ring 320, and the open retaining ring 130 is installed in the bearing inner ring 310. The lower clamping piece 120 connected to the center axis 140 passes through the positioning through hole 211 set in the base 210 from bottom to top and its outer contour clamps the lower side of the open retaining ring 130. The upper clamping piece 110 with a center hole 150 passes through the center axis 140 and clamps the upper side of the open retaining ring 130 through the first fastener 160, thereby achieving the clamping of the upper and lower sides of the bearing inner ring 310.

[0095] The support frame 170 connected with multiple support columns 172 is passed through the multiple limiting holes 212 correspondingly set on the base 210, and the central axis 140 passes through the first through hole 173 set in the center of the support plate 171 and the second fasteners 180 are set on the upper and lower sides of the support plate 172 to fix the support frame 170 on the central axis 140 and limit it by the base 210 to ensure that the inner ring is in a horizontal position and concentric with the outer ring.

[0096] The above step 3 may specifically include:

[0097] A measuring instrument (not shown) is vertically set on the bearing inner ring 310 (such as in a groove opened on the side wall of the upper clamping member 110); or a measuring instrument is vertically set on the support plate 171, and the axial clearance of the bearing 300 can be measured by moving the support plate 171 up and down.

[0098] The bearing clearance measuring device provided in the embodiment of the present application is different from the traditional method of directly moving the inner ring (outer ring) of the bearing to measure the axial clearance. It uses a measuring tool to constrain the spatial position of the bearing, thereby achieving the concentricity of the two halves of the inner ring of the bearing during measurement, and ensuring that the inner and outer rings of the bearing are in the same horizontal plane and can remain concentric. During measurement, it is only necessary to move the support plate of the tool up and down, which ensures measurement accuracy while facilitating operation and improving efficiency.

[0099] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application 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. Therefore, it should not be construed as a limitation to the present application.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A bearing clearance measuring device for detecting the axial clearance of a bearing, the bearing comprising an outer bearing ring and an inner bearing ring, characterized in that, The measuring device includes: A fixing mechanism, including a base and a pressing assembly; the base is provided with a positioning through hole, and a stepped surface for abutting against the outer ring of the bearing is provided on the inner wall surface of the positioning through hole; the pressing assembly is detachably connected to the base, and the pressing assembly is used to press the upper end surface of the outer ring of the bearing. A movable mechanism, including an upper pressing member and a lower pressing member coaxially arranged along the axial direction of the positioning through hole. The upper pressing member is arranged at the upper part of the positioning through hole and presses the upper end surface of the inner ring of the bearing, and the lower pressing member is arranged at the lower part of the positioning through hole and presses the lower end surface of the inner ring of the bearing.

2. The bearing clearance measuring device according to claim 1, wherein The cross section of the upper pressing member is an inverted trapezoid. From the end of the upper pressing member facing away from the lower pressing member to the end of the upper pressing member facing the lower pressing member, the outer side wall of the upper pressing member inclines towards the center of the upper pressing member. The cross section of the lower pressing member is a regular trapezoid. From the end of the lower pressing member facing away from the upper pressing member to the end of the lower pressing member facing the upper pressing member, the outer side wall of the lower pressing member inclines towards the center of the lower pressing member.

3. The bearing clearance measuring device according to claim 1, characterized in that, The movable mechanism further includes an open snap ring. The open snap ring is arranged in the positioning through hole. The outer side wall of the open snap ring abuts tightly against the inner side wall of the inner ring of the bearing, and the two end faces of the open snap ring are flush with the two end faces of the inner ring of the bearing respectively. Wherein, the upper pressing member and the lower pressing member are respectively pressed on the upper and lower sides of the open snap ring.

4. The bearing clearance measuring device according to any one of claims 1-3, characterized in that, One of the upper pressing member and the lower pressing member is connected with a central shaft, and the other of the upper pressing member and the lower pressing member is provided with a central hole, and the central shaft passes through the central hole.

5. The bearing clearance measuring device according to claim 4, wherein The central shaft is sleeved with a first fastener, and the first fastener presses the end face of the one of the upper pressing member and the lower pressing member provided with the central hole.

6. The bearing clearance measuring device according to claim 4, wherein The movable mechanism further includes a support frame. The support frame includes a support plate and a plurality of support columns. The support plate is located above the base, and each support column is connected to the surface of the support plate facing the base. The support columns are arranged at intervals along the circumferential direction of the support plate and pass through the base.

7. The bearing clearance measuring device according to claim 6, wherein The lower pressing member is connected with the central shaft, and the central shaft passes through the support plate to connect the lower pressing member with the support frame.

8. The bearing clearance measuring device according to claim 7, characterized in that, The central shaft is further sleeved with a second fastener, and the second fastener presses the two side plates of the support plate.

9. The bearing clearance measuring device according to any one of claims 1-3, characterized in that, The pressing assembly includes a plurality of pressing seats. The pressing seats are arranged at intervals along the circumferential direction of the base, and each pressing seat presses the upper end surface of the outer ring of the bearing.

10. The bearing clearance measuring device according to claim 9, characterized in that, The pressing assembly further includes a plurality of third fasteners. Each third fastener passes through each pressing seat to fix the pressing seat to the base.

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