Bearing friction torque measuring device

Abstract

A bearing friction torque measuring device belongs to the technical field of bearing measurement and comprises a measured bearing, a torsion meter, a measuring frame, a torsion meter fastening bolt and a measuring mandrel. The torsion meter comprises a three-petal locking block, a locking mechanism spring, a cylindrical main body and a locking nut; the measuring frame comprises a measuring frame base, a measuring frame vertical frame and a measuring frame transverse frame; the lower portion of the locking nut is in a conical cylinder shape, the conical degree of the conical cylinder shape is the same as that of the conical body of the three-petal locking block, and the shape of the conical body on the lower portion of the locking nut is matched with the shape of the outer side of the three-petal locking block. The measuring mandrel comprises a measuring mandrel clamping end and a measuring mandrel measuring end, and the measuring mandrel clamping end is a thin shaft; the upper end of the clamping end of the measuring mandrel is upwards inserted into the center of the three-petal locking block; the side surface of the measuring end of the measuring mandrel is provided with taper with big top and small bottom; the beneficial effects of the utility model are that the structure is simplified, the efficiency is high, the effect is good, the measurement cost is low, and the operation is convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to a friction torque measuring device, especially to a bearing friction torque measuring device used between processes, which can quickly, efficiently and accurately judge the friction torque extreme value of the bearing, is suitable for large batch measurement between processes and belongs to the technical field of bearing measurement. BACKGROUND

[0002] The measured bearing of the utility model is used for a power amplifier to realize stepless speed regulation of the power amplifier. The high-dynamic performance components in stage lighting, the volume regulator of high-grade combination sound, the high-end automobile high beam and low beam brightness regulator all apply the stepless speed regulation power amplifier to achieve the ideal state required by the user. The power amplifier bearing is a sealed ball bearing, and the maximum feature is to have uniform friction torque.

[0003] At present, the large and numerical control bearing friction torque measuring instrument used in the laboratory can accurately measure and judge the friction torque of the bearing through the torque sensor, such as the provisions of the measuring device in "Rolling Bearing Friction Torque Measurement Method" GB / T32562-2016. However, the use of such instruments has complex measuring devices, low measuring efficiency, high requirements for measuring environment and measuring personnel, high measuring cost, and is not suitable for large batch measurement between processes.

[0004] In addition, the measuring spindle measuring end of the starting friction torque measuring device of the general ball bearing is not provided with a taper. For example, the authorized announcement No. CN 218271160 U and the invention name are a starting friction torque measuring device for assembling a micro deep groove ball bearing. The measured bearing inner ring is completely attached to the outer side surface of the bearing installation spindle, the bearing installation spindle is not convenient to put in and take out, and the operation is not convenient. UTILITY MODEL CONTENTS

[0005] The utility model aims at the defects of the prior art of the above-mentioned friction torque measuring device, such as complex structure, low efficiency, poor effect, high measuring cost, no taper on the measuring end of the measuring spindle, difficulty in putting the measured bearing into the measuring end of the measuring spindle, and inconvenient operation. A bearing friction torque measuring device is provided, which can achieve the purposes of structure simplification, high efficiency, good effect, low measuring cost, taper design on the measuring end of the measuring spindle, easy putting of the measured bearing into the measuring end of the measuring spindle, and convenient operation.

[0006] The utility model discloses a bearing friction torque measuring device, especially relates to a bearing friction torque measuring device used between processes, which comprises a measured bearing and a torsion meter.

[0007] It also comprises a measuring frame, a torsion meter fastening bolt and a measuring mandrel.

[0008] The torsion meter further comprises a cylindrical main body and a locking nut.

[0009] The upper part of the cylindrical main body B is arranged in the circular mounting hole of the measuring frame crossbeam, and the measuring frame crossbeam is fixedly connected with the upper part of the cylindrical main body B through the torsion meter fastening bolt, so that the measuring frame crossbeam is fastened with the torsion meter.

[0010] The inner hole of the upper end of the locking nut is provided with an internal thread which is matched with the external thread on the cylindrical main body C, and the upper end of the locking nut is screwed on the external thread of the cylindrical main body C.

[0011] The measuring mandrel comprises a measuring mandrel clamping end and a measuring mandrel measuring end, the measuring mandrel clamping end is a thin shaft, and the measuring mandrel measuring end is designed according to the inner diameter size of the bearing; the measuring mandrel clamping end and the measuring mandrel measuring end are an integral structure, the upper end of the measuring mandrel clamping end is inserted into the center of the three-petal locking block upward, the side surface of the measuring mandrel measuring end is provided with a taper, which is large at the top and small at the bottom; the taper facilitates the mounting and dismounting of the measured bearing, and the friction force generated between the inner sleeve of the measured bearing and the outer surface of the measuring mandrel measuring end can fix the bearing on the measuring mandrel measuring end; the taper should not be too large, otherwise the contact area between the inner sleeve of the bearing and the measuring mandrel measuring end will be small, and the bearing will fall off; the taper should not be too small either; if the taper is too small, the bearing is not easy to install; the height of the measuring mandrel measuring end is 1.5-3 times the height of the bearing;

[0012] According to the requirement of the bearing friction torque, different range torsion tables are selected to measure the bearing friction torque of different requirements;

[0013] The friction torque measuring device can quickly, efficiently and accurately determine the friction torque extreme value of the bearing, the measuring device is simple, the measurement is simple, and the measurement effect is good and stable;

[0014] The three-petal locking block of the torsion table is loosened or locked: the initial state of the torsion table, the locking nut is loosened downward, the locking nut is located at the lower part of the outer thread of the cylindrical body C, the three locking mechanism springs are in a relaxed and open state, and the three-petal locking block is connected with the measuring mandrel clamping end; the locking nut is tightened upward, when the locking nut is turned upward and is located at the upper part of the outer thread of the cylindrical body C, the three-petal locking block is compressed, the top angle formed by the two sides of each locking block clamps the measuring mandrel clamping end, and the three locking mechanism springs are in a compressed state; when the locking nut is turned downward again, the three locking mechanism springs are in a relaxed and open state again, and the torsion table returns to the initial state;

[0015] The bearing friction torque measurement process: when measuring, the locking nut of the torsion table is turned upward to clamp the measuring mandrel clamping end, and then the measured bearing is sleeved on the measuring mandrel measuring end; the friction force generated between the inner sleeve of the measured bearing and the outer surface of the measuring mandrel measuring end can fix the measured bearing on the measuring mandrel measuring end; then the value of the scale on the side or the dial on the top is read out by turning the bearing clockwise, and then the value of the scale on the side or the dial on the top is read out by turning the bearing counterclockwise; the maximum value obtained by selecting the clockwise and counterclockwise rotation twice is the friction torque extreme value of the bearing.

[0016] The readings of the scale on the side and the dial on the top are the same, which is convenient for reading at different angles; in practice, in order to accurately determine the friction torque extreme value of the bearing, the average value of 3-5 measurement data can be taken

[0017] The diameter of the clamping end of the measuring mandrel is 5-6mm, and the length is 20mm, so as to match the length and the torsion meter; the taper of the measuring end of the measuring mandrel is set as 1:10, and the diameter of the middle part of the measuring end of the measuring mandrel is 7-55mm.

[0018] The small end diameter of the measuring end of the measuring mandrel is 34.5mm, the large end diameter of the measuring end of the measuring mandrel is 36.5mm, the height of the measuring end of the measuring mandrel is 20mm, and the taper is (36.5-34.5):20, namely 1:10; the measured bearing is a power amplifier bearing 6707-2RS, which is a core rotating supporting element specially designed for high dynamic performance components in stage lighting, such as a swing head lamp or a laser scanning system; the power amplifier bearing 6707-2RS is a double-sealed ball bearing, which is greased and sealed with a light contact structure; the friction torque of the bearing is synthesized by the damping of the lubricating grease and the friction force generated by the contact between the sealing ring and the bearing.

[0019] The bearing friction torque of the torsion meter is 40-60gf•cm, and the range is 0-200gf•cm.

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] (1) the cylindrical main body provided with external threads is fixedly connected with the measuring frame through the torsion meter fastening bolt, the upper part of the cylindrical main body is provided with an internally threaded locking nut, and the lower part of the cylindrical main body is a conical cylinder body matched with the conical body of the three-petal locking block; the locking nut of the torsion meter is rotated to clamp the clamping end of the measuring mandrel; the measuring device is simple, the measuring is simple, the measuring efficiency is high, the friction torque extreme value of the bearing can be quickly, efficiently and accurately judged, the measuring effect is good and stable, the requirements for the measuring environment and the measuring personnel are not high, and the measuring device is suitable for large batch measurement between processes;

[0022] (2) the measuring end of the measuring mandrel of the measuring device is provided with a taper, which is large at the upper part and small at the lower part; the taper can quickly assemble and disassemble the measured bearing, and the friction force between the bearing inner sleeve and the measuring end of the mandrel can fix the bearing on the mandrel; the measured bearing is easily sleeved on the measuring end of the measuring mandrel, so that the operation is convenient, and the production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a front view of a bearing friction torque measuring device;

[0024] Figure 2 is a front view of a bearing friction torque measuring device (embodiment 1);

[0025] Figure 3 is a three-petal locking block, a locking nut and a locking mechanism spring combination plan view Figure 2A-A direction, the initial state of the torsion meter, the locking nut is loosened downward, the three locking mechanism springs are in the state of opening relaxation, and the three clamping blocks are connected with the clamping end of the measuring mandrel in a gap connection.

[0026] Figure 4 is: a combined plan view of the three clamping blocks, the locking nut and the locking mechanism springs (the locking nut is tightened upward, the three locking mechanism springs are in a compressed state, and the three clamping blocks are connected with the clamping end of the measuring mandrel in a compressed connection);

[0027] Figure 5 is: a plan view of the bearing friction torque measuring device;

[0028] Figure 6 is: Figure 2 is: a combined sectional view of the cylindrical body C, the locking nut, the three clamping blocks, the locking mechanism springs and the measuring mandrel;

[0029] Figure 7 is: a one-side partial enlarged view of the measuring mandrel measuring end and the measured bearing;

[0030] Figure 8 is: a front sectional view of the bearing friction torque measuring device (embodiment 2).

[0031] The drawing mark description: measured bearing 1, torsion meter 2, clamping block 201, locking mechanism spring 202, spring fixing groove 203, cylindrical body 204, cylindrical body A 204-A, cylindrical body B 204-B, cylindrical body C 204-C, locking nut 205, dial 206, scale 207, measuring frame 3, measuring frame base 301, measuring frame vertical frame 302, vertical frame fastening bolt 303, measuring frame horizontal frame 304, horizontal frame fastening bolt 305, torsion meter fastening bolt 4, measuring mandrel 5, measuring mandrel clamping end 501, measuring mandrel measuring end 502. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. The left, right, front and back directions are for convenience of description, and can be changed in practice. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application. Embodiment 1:

[0033] As shown in Figures 1 to 7 , a bearing friction torque measuring device, as shown in Figure 1 andFigure 2 As shown, the device includes a bearing 1 to be measured and a torque meter 2. The torque meter 2 includes a three-lobed locking block 201 and three locking mechanism springs 202. The locking block 201 is fan-shaped in top view; the outer side of the locking block 201 in front view is conical; the inner two sides of the locking block 201 are flat; and the outer side of the three-lobed locking block 201 is generally conical. Figure 2 and Figure 5 As shown, the three-lobed locking blocks 201 are evenly arranged, and spring fixing grooves 203 are provided in the middle of the inner side planes of two adjacent locking blocks 201. The two ends of the locking mechanism spring 202 are respectively fixed in the spring fixing grooves 203 of the two adjacent locking blocks 201.

[0034] It also includes the measuring frame 3, the torque gauge fastening bolt 4, and the measuring mandrel 5; such as Figure 1 , Figure 2 and Figure 5 As shown, the measuring frame 3 includes a measuring frame base 301, a measuring frame vertical frame 302, vertical frame fastening bolts 303, a measuring frame horizontal frame 304, and a horizontal frame fastening bolt 305; the measuring frame horizontal frame 304 is square in top view, and a circular mounting hole is provided in the middle of the measuring frame horizontal frame 304; the lower end of the measuring frame vertical frame 302 is fixedly connected to the measuring frame base 301 by the vertical frame fastening bolts 303, and the measuring frame horizontal frame 304 is fixedly connected to the upper part of the measuring frame vertical frame 302 by the horizontal frame fastening bolts 305;

[0035] The torque gauge 2 also includes a cylindrical body 204 and a locking nut 205; the cylindrical body 204 is an integral structure, comprising an upper cylindrical body A 204-A, a middle cylindrical body B 204-B, and a lower cylindrical body C 204-C; the cylindrical body A 204-A protrudes above the measuring frame crossbar 304, and a scale 206 is horizontally arranged inside the cylindrical body A 204-A, which is used to observe the measurement values ​​from a top-down perspective;

[0036] like Figure 1 As shown, the upper part of the cylindrical body B 204-B passes through the circular mounting hole of the measuring frame crossbar 304. The measuring frame crossbar 304 is fixedly connected to the upper part of the cylindrical body B 204-B by the torque gauge fastening bolt 4, thereby fastening the measuring frame crossbar 304 to the torque gauge 2. A scale 207 is provided on one side of the lower part of the cylindrical body B 204-B. The scale 207 is used to observe the measurement values ​​from the side. The cylindrical body C 204-C is provided with external threads.

[0037] like Figure 6As shown, the inner hole of the upper end of the locking nut 205 is provided with internal threads, which match the external threads on the cylindrical body C 204-C, and the upper end of the locking nut 205 is screwed onto the external threads of the cylindrical body C 204-C; the lower part of the locking nut 205 is a conical cylinder, which has the same taper as the conical body of the three-petal locking block 201, and the shape of the conical body of the lower part of the locking nut 205 matches the shape of the outer side of the three-petal locking block 201, and the conical cylinder is tightly fitted on the outer side of the conical body; when the locking nut 205 is screwed in both directions and moves up and down, the cylindrical body C 204-C remains stationary, and the three-petal locking block 201 will be locked or loosened;

[0038] As shown in Figure 1 , Figure 2 and Figure 7 , the measuring mandrel 5 includes a measuring mandrel clamping end 501 and a measuring mandrel measuring end 502, the measuring mandrel clamping end 501 is a thin shaft, and the diameter of the measuring mandrel measuring end 502 is designed according to the inner diameter of the bearing; the measuring mandrel clamping end 501 and the measuring mandrel measuring end 502 are an integral structure, the upper end of the measuring mandrel clamping end 501 is inserted into the center of the three-petal locking block 201; the side of the measuring mandrel measuring end 502 is provided with a taper, which is large at the top and small at the bottom; the taper facilitates the assembly and disassembly of the measured bearing 1, and at the same time, the inner sleeve of the measured bearing 1 generates friction with the measuring mandrel measuring end 502, fixing the bearing on the measuring mandrel measuring end 502; the taper should not be too large, otherwise the contact area between the bearing inner sleeve and the mandrel measuring end will be small, and the bearing will fall off; the taper should also not be too small; if the taper is too small, it is not easy to install the bearing; the height H of the measuring mandrel measuring end 502 is 1.5-3 times the height h of the bearing;

[0039] According to the requirement of bearing friction torque, different range of torque meter 2 is selected to measure different requirements of bearing friction torque;

[0040] The friction torque measuring device can quickly, efficiently and accurately determine the extreme value of the friction torque of the bearing, the measuring device is simple, the measurement is simple, and the measurement effect is good and stable;

[0041] The three-petal locking block 201 of the torque meter 2 is loosened or locked:

[0042] As shown in Figure 1 and Figure 3 , the initial state of the torque meter 2, the locking nut 205 is loosened downward, the locking nut 205 is located at the lower part of the external threads on the cylindrical body C 204-C, the three locking mechanism springs 202 are in a relaxed and open state, and the three-petal locking block 201 is connected to the measuring mandrel clamping end 501 with a gap;

[0043] As shown in Figure 2 and Figure 4As shown, the locking nut 205 is screwed up, when the locking nut 205 is screwed up, the three locking blocks 201 are pressed, the top angle formed by the two sides of each locking block 201 clamps the measuring mandrel clamping end 501, and the three locking mechanism springs 202 are in a compressed state;

[0044] When the locking nut 205 is screwed down again, the three locking mechanism springs 202 are in a relaxed and open state again, and the torsion table 2 returns to the initial state;

[0045] Bearing friction torque measurement process:

[0046] When measuring, as shown in Figure 2 and Figure 4 , turn the torsion table 2 locking nut 205 up, clamp the measuring mandrel clamping end 501, and then put the measured bearing 1 on the measuring mandrel measuring end 502. The friction force generated between the inner sleeve of the measured bearing 1 and the outer surface of the measuring mandrel measuring end 502 can fix the measured bearing 1 on the measuring mandrel measuring end 502. Then turn the bearing clockwise to read the value of the scale 207 on the side or the dial 206 above, and then turn the bearing counterclockwise to read the value of the scale 207 on the side or the dial 206 above. The maximum value obtained by selecting the clockwise and counterclockwise rotation twice is the friction torque extreme value of the bearing.

[0047] As shown in Figure 1 , Figure 2 and Figure 5 , the readings of the scale 207 on the side and the dial 206 above are the same, which is convenient for reading at different angles; in practice, in order to accurately judge the friction torque extreme value of the bearing, the average value of 3-5 measurement data can be taken

[0048] As shown in Figure 6 , the diameter φ1 of the measuring mandrel clamping end 501 is 5mm, and the length is 20mm, which matches the length and the torsion table 2; the taper of the measuring mandrel measuring end 502 is set to 1:10, and the diameter φ2 of the middle part of the measuring mandrel measuring end 502 is 35mm.

[0049] As shown in Figure 2 and Figure 7As shown in the figure, the small end diameter φ3 of the measuring spindle measuring end 502 is 34.5 mm, the large end diameter φ4 of the measuring spindle measuring end 502 is 36.5 mm, the height H of the measuring spindle measuring end 502 is 20 mm, and the taper is (36.5-34.5): 20, i.e. 1:10; the measured bearing 1 is a power amplifier bearing 6707-2RS, which is a core rotating support element specially designed for high dynamic performance components in stage lighting, such as a swing head lamp or a laser scanning system; the power amplifier bearing 6707-2RS is a double-sealed ball bearing, grease lubricated, and the sealing ring is a light contact structure; the grease damping and the friction force generated by the contact between the sealing ring and the bearing jointly act on the friction torque of the bearing, and the friction torque of the 6707-2RS bearing is 40-60 gf•cm; the size of the measured bearing 1 is 35*44*5 mm.

[0050] As shown in the figure, Figure 2 and Figure 7 the bearing friction torque of the torque meter 2 is 40-60 gf•cm, and the range is 0-200 gf•cm. Example 2:

[0051] As shown in the figure, Figure 8 the small end diameter φ3 of the measuring spindle measuring end 502 is 8 mm, and the large end diameter φ4 of the measuring spindle measuring end 502 is 9 mm.

[0052] The rest is the same as in Example 1.

[0053] The above examples are only the preferred embodiments of the present application, and the usual changes and replacements made by those skilled in the art within the scope of the technical scheme of the present application should be included in the protection scope of the present application.

Claims

1. A bearing friction torque measuring device, comprising a measured bearing, a torsion meter; the torsion meter comprises three clamping blocks and three clamping mechanism springs, the top view direction of the clamping block is fan-shaped; the outer side of the front view direction of the clamping block is conical, the inner side of the clamping block is flat, the outer side of the three clamping blocks is conical as a whole; the three clamping blocks are uniformly arranged, the middle part of the flat surface on the inner side of the two adjacent clamping blocks is provided with a spring fixing groove, and the two ends of the clamping mechanism spring are fixed in the spring fixing grooves of the two adjacent clamping blocks respectively; characterized in that It also includes a measuring frame, a torsion meter fastening bolt and a measuring mandrel; the measuring frame comprises a measuring frame base, a measuring frame vertical frame, a vertical frame fastening bolt, a measuring frame horizontal frame and a horizontal frame fastening bolt; the measuring frame horizontal frame is square in the top view direction, and the middle part of the measuring frame horizontal frame is provided with a circular mounting hole; the lower end of the measuring frame vertical frame is fixedly connected to the measuring frame base through the vertical frame fastening bolt, and the measuring frame horizontal frame is fixedly connected to the upper part of the measuring frame vertical frame through the horizontal frame fastening bolt; The torsion meter further comprises a cylindrical body and a locking nut; the cylindrical body is an integral structure, and the cylindrical body comprises a cylindrical body A at the upper part, a cylindrical body B at the middle part and a cylindrical body C at the lower part; the cylindrical body A is exposed above the measuring frame horizontal frame, and a dial is arranged in the cylindrical body A in the horizontal direction; The upper part of the cylindrical body B is arranged in the circular mounting hole of the measuring frame horizontal frame, and the measuring frame horizontal frame is fixedly connected to the upper part of the cylindrical body B through the torsion meter fastening bolt; a scale is arranged on one side of the lower part of the cylindrical body B; the cylindrical body C is provided with external threads; The inner hole of the upper end of the locking nut is provided with internal threads, the internal threads are matched with the external threads on the cylindrical body C, and the upper end of the locking nut is screwed on the external threads of the cylindrical body C; the lower part of the locking nut is conical, the taper of the conical part is the same as that of the conical body of the three clamping blocks, the shape of the conical part of the lower part of the locking nut is matched with the shape of the outer side of the three clamping blocks, and the conical part is tightly sleeved on the outer side of the conical body; when the locking nut is screwed or moved up and down, the cylindrical body C remains stationary, and the three clamping blocks are locked or loosened; The measuring mandrel comprises a measuring mandrel clamping end and a measuring mandrel measuring end, and the measuring mandrel clamping end is a thin shaft; the measuring mandrel clamping end and the measuring mandrel measuring end are an integral structure, the upper end of the measuring mandrel clamping end is inserted into the center of the three clamping blocks, the side of the measuring mandrel measuring end is provided with a taper, and the taper is large at the top and small at the bottom; the taper facilitates the assembly and disassembly of the measured bearing, and the inner sleeve of the measured bearing generates friction with the measuring mandrel measuring end, so that the bearing is fixed to the measuring mandrel measuring end; the height of the measuring mandrel measuring end is 1.5-3 times the height of the bearing.

2. A bearing friction torque measuring device according to claim 1, characterized in that: The scale on the side and the dial on the top are the same in reading, which is convenient for reading at different angles.

3. A bearing friction torque measuring device according to claim 1, characterized in that: The diameter of the measuring mandrel clamping end is 5-6mm, and the length is 20mm, so that the length is matched with the torsion meter; the taper of the measuring mandrel measuring end is 1:10, and the diameter of the middle part of the measuring mandrel measuring end is 7-55mm.

4. A bearing friction torque measuring device according to claim 3, characterised in that: The small end diameter of the measuring spindle measuring end is 34.5mm, the large end diameter of the measuring spindle measuring end is 36.5mm, the height of the measuring spindle measuring end is 20mm, and the taper is (36.5-34.5):20, namely 1:10; the measured bearing is a power amplifier bearing 6707-2RS; the power amplifier bearing 6707-2RS is a double-sealed ball bearing; the size of the measured bearing is 35*44*5mm.

5. A bearing friction torque measuring device according to claim 3, characterized in that: The small end diameter of the measuring spindle measuring end is 8mm, and the large end diameter of the measuring spindle measuring end is 9mm.

6. A bearing friction torque measuring device according to claim 1, characterized in that: The bearing friction torque of the torsion meter is 40-60gf•cm, and the range is 0-200gf•cm.

Images