High-precision back-to-back assembly angular contact bearing friction torque measuring device

Abstract

The utility model relates to the technical field of bearing measurement, in particular to a high-precision back-to-back assembly angular contact bearing friction torque measuring device, which comprises a linear driving assembly, a rotary driving assembly, a mounting sleeve, a measuring head and a measuring assembly, a sensor is arranged at one end, facing the measuring head, of the measuring rod, a groove in contact with the measuring head is formed in the head of the sensor, and scales are arranged on one section, deviating from the sensor, of the measuring rod; a driving assembly for driving the measuring rod to move horizontally is arranged on the mounting table, the sensor is used for measuring starting force for driving the measuring head to rotate when the mounting sleeve rotates, and friction torque can be obtained according to the starting force and the force arm. According to the device, the friction torque measurement of the back-to-back assembly angular contact bearing is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of bearing measurement, in particular to a high-precision back-to-back angular contact bearing friction torque measuring device. Background Art

[0002] The resistance torque generated by friction during bearing operation is called friction torque. Friction torque is a significant factor affecting bearing noise, vibration, and lifespan, and impacts the accuracy, sensitivity, and power consumption of the host system. Therefore, friction torque is a crucial parameter for measuring bearing performance and accuracy.

[0003] Friction torque is divided into starting friction torque and running friction torque. Starting friction torque is the torque required to start a set of bearing rings relative to another fixed bearing ring. Kinematic friction torque is the rotational torque of the bearing under stable rotation conditions.

[0004] There are two main methods for measuring friction torque in the prior art. One is a simple measuring device that uses the principle of hanging weights (such as Figure 4 As shown in the figure, fix the inner ring of the bearing, apply a load to the end face of the outer ring, tie a thin wire to the outer diameter of the outer ring, connect the weight through the pulley, and repeatedly test to find the minimum starting weight. The friction torque is weight × arm (bearing outer ring radius). This measurement method is relatively primitive and can only measure the starting friction torque. The measurement result is affected by the friction between the thin wire and the pulley, and there is excess friction. One is the M series instrument electric method measurement device (such as Figure 5 As shown in Figure 1, a fixed force is applied to the outer ring end face. The inner ring rotates with a tight fit on the inner shaft. By detecting the driving force, the starting friction torque of the bearing is determined. This measurement method can test both starting and running friction torque. However, existing instruments are mostly designed for small and miniature bearings, limiting the measurement range. Furthermore, the driving force itself has large errors, making high-precision measurement difficult.

[0005] In summary, while the two existing test devices are cumbersome and have a limited measurement range, they can still measure the friction torque of a single bearing. However, in actual use, bearings, especially angular contact ball bearings, are often paired back-to-back to increase load capacity, eliminate backlash, and enhance rigidity. Therefore, existing devices are unable to measure the friction torque of paired bearings.

[0006] Therefore, it is necessary to provide a high-precision back-to-back angular contact bearing friction torque measurement device to solve the above problems. Utility Model Content

[0007] The utility model provides a high-precision back-to-back angular contact bearing friction torque measuring device to solve the existing problems.

[0008] The utility model discloses a high-precision back-to-back angular contact bearing friction torque measuring device adopts the following technical solutions, including:

[0009] A linear drive assembly, the output shaft of which is mounted vertically downward on a support frame;

[0010] The rotary drive assembly is arranged below the output shaft of the first linear drive assembly, and a mounting seat is concentrically arranged at the end of the drive shaft. The mounting seat and the output shaft are concentrically arranged opposite to each other, and the mounting seat and the output shaft are used to assemble with the inner ring of the back-to-back angular contact bearing;

[0011] The mounting sleeve is concentrically mounted on the outer ring of the mounting seat, and the inner ring of the mounting sleeve is used to cooperate with the outer ring of the back-to-back angular contact bearing;

[0012] A probe is horizontally connected to the outer wall of the mounting sleeve;

[0013] And a measuring component, which includes: a mounting platform, a measuring rod is horizontally passed through the mounting platform, a sensor is provided at the end of the measuring rod facing the measuring head, a groove is provided at the head of the sensor for contacting the measuring head, and a scale is provided on a section of the measuring rod away from the sensor; a driving component for driving the measuring rod to move horizontally is provided on the mounting platform, and the sensor is used to measure the starting force that drives the measuring head to rotate when the mounting sleeve rotates.

[0014] Preferably, the support frame includes: a base, on which a mounting frame is mounted via vertically arranged columns.

[0015] Preferably, the linear drive assembly comprises: a cylinder, wherein the output shaft of the cylinder is passed through a positioning ring provided at the bottom of the mounting frame.

[0016] Preferably, the rotary drive assembly includes a rotary motor, which is disposed in the base, and a drive shaft of the rotary motor vertically passes through the base and is connected to the mounting seat.

[0017] Preferably, the mounting seat includes: a cylindrical connecting seat, one end of the cylindrical connecting seat is provided with a mounting groove, the mounting groove is connected to the end of the drive shaft, the other end of the cylindrical connecting seat is concentrically connected with a mounting column, and the diameter of the mounting column is smaller than the diameter of the cylindrical connecting seat, and the length of the mounting column is greater than the axial length of a single bearing in the back-to-back angular contact bearing.

[0018] Preferably, the output shaft includes: a shaft connected to the output end of the linear drive component, a mounting shaft is provided at one end of the shaft facing the mounting seat, the diameter of the mounting shaft is smaller than the diameter of the shaft, and the diameters of the mounting shaft and the mounting column are the same, the length of the mounting shaft is smaller than the axial length of a single bearing in the back-to-back angular contact bearing, and the mounting shaft, the mounting column and the inner ring of the back-to-back angular contact bearing are matched.

[0019] Preferably, the inner wall of the mounting sleeve is provided with an annular mounting groove surface, and the annular mounting groove surface is matched with the outer ring of the back-to-back angular contact bearing.

[0020] Preferably, the driving assembly includes: a transmission rod is provided on the knob, a gear is fixed to the transmission rod after passing through the mounting platform, a rack is provided in the middle of the measuring rod, and the gear and the rack are meshed.

[0021] Preferably, the annular mounting groove surface of the mounting sleeve and the outer ring of the back-to-back angular contact bearing are clearance-fitted with a fitting clearance of 0.003 mm to 0.008 mm.

[0022] The beneficial effects of the utility model are:

[0023] The force arm of the friction torque when the head groove of the sensor contacts the probe is read by the scale on the measuring rod, and the bearing is driven to rotate by the driving assembly. The sensor displays the starting force of the back-to-back angular contact bearing when it starts. At this time, the starting friction torque of the bearing is the product of the starting force and the corresponding stress arm when the back-to-back angular contact bearing starts; the friction torque in the dynamic rotation process of the back-to-back angular contact bearing is the product of the starting force and the force arm after the back-to-back angular contact bearing rotates smoothly. Therefore, this device realizes the friction torque measurement of the back-to-back angular contact bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a schematic structural diagram of a high-precision back-to-back angular contact bearing friction torque measurement device of the utility model;

[0026] Figure 2 This is a schematic diagram of the contact between the side head and the sensor in a high-precision back-to-back angular contact bearing friction torque measurement device of the utility model;

[0027] Figure 3 This is a schematic diagram of the scale on the measuring rod in the measuring assembly of the present invention;

[0028] Figure 4 It is a structural diagram of a simple measuring device;

[0029] Figure 5 Schematic diagram of the electrokinetic measurement device of the M series instrument.

[0030] In the figure: 1. Cylinder; 2. Mounting frame; 3. Column; 4. Back-to-back angular contact bearing; 5. Mounting seat; 6. Drive shaft; 7. Locating ring; 8. Output shaft; 9. Mounting sleeve; 10. Probe; 11. Sensor; 12. Measuring assembly. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] The utility model is a high-precision back-to-back angular contact bearing friction torque measuring device embodiment, such as Figure 1 As shown, it includes: a linear drive component, a rotary drive component, a mounting sleeve 9, a probe 10 and a measuring component 12. The output shaft 8 of the linear drive component is vertically mounted downward on the support frame; the rotary drive component is arranged below the output shaft 8 of the first linear drive component, and the end of the drive shaft 6 of the rotary drive component is concentrically provided with a mounting seat 5, the mounting seat 5 and the output shaft 8 are concentrically arranged opposite to each other, and the mounting seat 5 and the output shaft 8 are used to assemble with the inner ring of the back-to-back angular contact bearing 4; the mounting sleeve 9 is concentrically sleeved on the outer ring of the mounting seat 5, and its inner ring is used to cooperate with the outer ring of the back-to-back angular contact bearing 4; the probe 10 is horizontally connected to the outer wall of the mounting sleeve 9; the measuring component 12 includes: a mounting platform, a measuring rod is horizontally passed through the mounting platform, a sensor 11 is provided at one end of the measuring rod facing the probe 1, a groove is provided at the head of the sensor 11 for contacting the probe 10, and a scale is provided on a section of the measuring rod away from the sensor 11; a driving component for driving the measuring rod to move horizontally is provided on the mounting platform, and the driving component includes: a transmission rod is provided on the knob, a gear is fixed to the transmission rod after it passes through the mounting platform, a rack is provided in the middle of the measuring rod, the gear and the rack are engaged, and the gear can be driven to rotate by turning the knob, and the engagement of the gear and the rack drives the measuring rod to move horizontally, so that the groove at the head of the sensor 11 on the measuring rod contacts the probe 10. It should be noted that when the measuring rod is driven to move, the side head 10 extends into the groove, and at this time the side head 10 does not contact the side wall of the groove. Only when the rotating driving component drives the back-to-back angular contact bearing 4 to start rotating, the side head 10 rotates to contact the side wall of the groove. In this embodiment, the groove at the head of the sensor 11 can be as follows Figure 2 The U-shaped groove structure shown has a U-shaped groove in the middle, and the two side plates of the U-shaped groove structure are both in the same horizontal plane. The side head 10 rotates to contact the side plates of the U-shaped groove.

[0033] Specifically, the support frame includes: a base, on which a mounting frame 2 is mounted via vertically arranged columns 3 .

[0034] Specifically, the linear drive assembly includes a cylinder 1, whose output shaft 8 passes through a locating ring 7 at the bottom of the mounting frame 2. It should be noted that the loading force of the cylinder 1 is transmitted to the inner ring of the back-to-back angular contact bearing 4 via the output shaft 8, and the loading force of the cylinder 1 can be further adjusted. The output shaft 8 extends from the locating ring 7 but does not contact it. The output shaft 8 includes: a shaft and a mounting shaft. The shaft is connected to the output end of the linear drive assembly. The mounting shaft is coaxially threadedly connected to one end of the shaft facing the mounting seat 5. A step is formed at the connection between the shaft and the mounting shaft, and the diameter of the mounting shaft is smaller than the diameter of the shaft. The diameter of the mounting shaft and the mounting column are the same. The length of the mounting shaft is smaller than the axial length of a single bearing in the back-to-back angular contact bearing 4. The mounting shaft, the mounting column and the inner ring of the back-to-back angular contact bearing 4 are matched. The shaft and the mounting shaft are connected by threads, that is, the mounting shaft is replaceable. The mounting shaft of the corresponding size is replaced according to the diameter of the inner ring of the back-to-back angular contact bearing 4 to achieve the measurement of back-to-back angular contact bearings 4 with different inner diameters. The preload force of the linear drive 8 can be controlled, that is, the preload force is evenly applied to the inner ring of the back-to-back angular contact bearing 4 through the step formed by the shaft and the mounting shaft, thereby achieving precise and uniform loading of the preload of the back-to-back angular contact bearing 4.

[0035] Specifically, the rotary drive assembly includes a rotary motor, which is disposed within a base. The drive shaft 6 of the rotary motor vertically extends through the base and is connected to the mounting seat 5. The motor is connected to the mounting seat 5 via the drive shaft 6. The mounting seat 5 includes a cylindrical connecting seat, one end of which is provided with a mounting groove, which is connected to the end of the drive shaft 6. The other end of the cylindrical connecting seat is concentrically connected to a mounting post, and the diameter of the mounting post is smaller than the diameter of the cylindrical connecting seat. The mounting groove is a stop groove, so that when the drive shaft 6 rotates, the mounting seat 5 can be driven to rotate through the stop groove. The mounting post of the mounting seat 5 can be replaced to install bearings of corresponding sizes, thereby measuring back-to-back angular contact bearings 4 of different sizes. The mounting post of the mounting seat 5 extends into the inner diameter of the back-to-back angular contact bearing 4. The length of the mounting post is greater than the axial length of a single bearing in the back-to-back angular contact bearing 4, providing a concentric effect for the back-to-back angular contact bearing 4, making the measuring force more uniform and the measurement accuracy high.

[0036] Specifically, the inner wall of the mounting sleeve 9 is provided with an annular mounting groove surface, and the annular mounting groove surface is matched with the outer ring of the back-to-back angular contact bearing 4. In this embodiment, the annular mounting groove surface of the mounting sleeve 9 and the outer ring of the back-to-back angular contact bearing 4 are clearance-matched with a fitting clearance of 0.005 mm. It should be noted that a threaded hole for connecting the side head 10 is provided in the middle of the outer ring of the mounting sleeve 9, and the probe 10 is screwed into the mounting sleeve 9 through the threaded hole.

[0037] How it works

[0038] When using, such as Figure 1 As shown, two angular contact ball bearings are installed back-to-back onto the mounting shaft and mounting column. Then, a mounting sleeve 9 is placed over the outer rings of the back-to-back angular contact bearings 4. The control cylinder 1 compresses the inner rings of the back-to-back angular contact bearings 4 with a preset load force via the output shaft 8. After the preload force is applied, the back-to-back angular contact bearings 4 become one piece. The knob of the measuring assembly 12 is turned to rotate the gears. The meshing of the gears and racks drives the measuring rod horizontally, so that the groove at the head of the sensor 11 on the measuring rod contacts the stylus 10. The friction torque arm is then read from the scale on the measuring rod. The drive motor is turned on to drive the bearings to rotate, and the sensor 11 displays the bearing starting force. The starting friction force of the bearings is the product of the starting force and the lever arm during the starting process of the back-to-back angular contact bearings 4. The friction torque during the dynamic rotation of the back-to-back angular contact bearings 4 is the product of the starting force and the lever arm after the back-to-back angular contact bearings 4 have stabilized.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-precision back-to-back angular contact bearing friction torque measurement device, characterized in that: include: A linear drive assembly, the output shaft of which is mounted vertically downward on a support frame; The rotary drive assembly is arranged below the output shaft of the first linear drive assembly, and a mounting seat is concentrically arranged at the end of the drive shaft. The mounting seat and the output shaft are concentrically arranged opposite to each other, and the mounting seat and the output shaft are used to assemble with the inner ring of the back-to-back angular contact bearing; The mounting sleeve is concentrically mounted on the outer ring of the mounting seat, and the inner ring of the mounting sleeve is used to cooperate with the outer ring of the back-to-back angular contact bearing; A probe is horizontally connected to the outer wall of the mounting sleeve; And a measuring component, which includes: a mounting platform, a measuring rod is horizontally passed through the mounting platform, a sensor is provided at the end of the measuring rod facing the measuring head, a groove is provided at the head of the sensor for contacting the measuring head, and a scale is provided on a section of the measuring rod away from the sensor; a driving component for driving the measuring rod to move horizontally is provided on the mounting platform, and the sensor is used to measure the starting force that drives the measuring head to rotate when the mounting sleeve rotates.

2. A high-precision back-to-back angular contact bearing friction torque measurement device according to claim 1, characterized in that: The support frame includes: A base is provided with a mounting frame via vertically arranged columns.

3. The high-precision back-to-back angular contact bearing friction torque measurement device according to claim 2, characterized in that: The linear drive assembly comprises a cylinder, wherein the output shaft of the cylinder is passed through a positioning ring arranged at the bottom of the mounting frame.

4. The high-precision back-to-back angular contact bearing friction torque measurement device according to claim 2, characterized in that: The rotary drive assembly comprises a rotary motor which is arranged in the base. The drive shaft of the rotary motor vertically passes through the base and is connected with the mounting seat.

5. The high-precision back-to-back angular contact bearing friction torque measurement device according to claim 1 is characterized in that the mounting seat include: A cylindrical connecting seat, one end of the cylindrical connecting seat is provided with a mounting groove, the mounting groove is connected to the end of the drive shaft, the other end of the cylindrical connecting seat is concentrically connected with a mounting column, and the diameter of the mounting column is smaller than the diameter of the cylindrical connecting seat, and the length of the mounting column is greater than the axial length of a single bearing in the back-to-back angular contact bearing.

6. A high-precision back-to-back angular contact bearing friction torque measurement device according to claim 5, characterized in that the output shaft include: A shaft rod connected to the output end of the linear drive assembly is provided with a mounting shaft at one end of the shaft rod facing the mounting seat. The diameter of the mounting shaft is smaller than the diameter of the shaft rod, and the diameters of the mounting shaft and the mounting column are the same. The length of the mounting shaft is smaller than the axial length of a single bearing in the back-to-back angular contact bearing. The mounting shaft, the mounting column and the inner ring of the back-to-back angular contact bearing are matched.

7. The high-precision back-to-back angular contact bearing friction torque measurement device according to claim 1, characterized in that: An annular mounting groove surface is provided on the inner wall of the mounting sleeve, and the annular mounting groove surface is matched with the outer ring of the back-to-back angular contact bearing.

8. The high-precision back-to-back angular contact bearing friction torque measurement device according to claim 1, characterized in that: The driving component includes: a transmission rod is set on the knob, a gear is fixed on the transmission rod after passing through the mounting platform, a rack is set in the middle of the measuring rod, and the gear and the rack are meshed.

9. The high-precision back-to-back angular contact bearing friction torque measurement device according to claim 7, characterized in that: The annular mounting groove surface of the mounting sleeve and the outer ring of the back-to-back angular contact bearing are clearance-fitted with a fitting clearance of 0.003 mm to 0.008 mm.

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