CN109238709B - Device and method for measuring equivalent friction coefficient of rolling bearing - Google Patents
Device and method for measuring equivalent friction coefficient of rolling bearing Download PDFInfo
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- CN109238709B CN109238709B CN201811283190.7A CN201811283190A CN109238709B CN 109238709 B CN109238709 B CN 109238709B CN 201811283190 A CN201811283190 A CN 201811283190A CN 109238709 B CN109238709 B CN 109238709B
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Abstract
The invention discloses a rolling bearing equivalent friction coefficient measuring device which comprises a machine body, a sliding seat, two air-floating main shaft assemblies, a mandrel, a rotating speed sensor and a data acquisition/processing/calculating/displaying system. The air-floating main shaft assembly comprises an air-floating main shaft substrate and an air-floating main shaft; one air-floating main shaft matrix is fixedly connected with the machine body, the other air-floating main shaft matrix is fixedly connected with the sliding seat, and the two air-floating main shafts are coaxial; two ends of the mandrel are respectively connected with the two air floatation main shafts through conical surface matching or a coupler; the inner ring of the rolling bearing to be tested is arranged on the shaft shoulder of the mandrel; the rotating speed sensor is used for monitoring the angular speed of the mandrel or the air floatation main shaft; the data acquisition/processing/calculation/display system is used for acquiring and processing the angular speed signal of the mandrel or the air floatation main shaft monitored by the rotating speed sensor and calculating the equivalent friction torque and the equivalent friction coefficient of the rolling bearing to be tested. The measuring device has the capability of quickly and precisely measuring the equivalent friction torque and the equivalent friction coefficient of the rolling bearing.
Description
Technical Field
The invention belongs to the technical field of friction energy consumption characteristic testing of rolling bearings, and relates to a device and a method for measuring an equivalent friction coefficient of a rolling bearing.
Background
The friction energy consumption in the running process of the rolling bearing directly influences the heating, temperature rise, abrasion and the like of the bearing, and further influences the performance and the service life of the rolling bearing. The friction energy consumption characteristic of the rolling bearing is an inherent characteristic of the rolling bearing, and reflects the manufacturing quality and the cleaning degree of the rolling bearing to a certain extent.
At the present stage, starting friction torque and rotating friction torque are respectively adopted to evaluate the starting friction energy consumption and the rotating friction energy consumption of the rolling bearing, and various rolling bearing friction torque measuring devices are used to measure the starting friction torque and the rotating friction torque of the rolling bearing to be measured.
Because the amplitude of the starting friction torque and the rotating friction torque of the rolling bearing is smaller under the test condition, the precision of a micro-force or micro-torque sensor used by the conventional rolling bearing friction torque measuring device is obviously insufficient when high-precision measurement is carried out. Therefore, it is necessary to develop a new measuring device for detecting the friction energy consumption characteristics of the rolling bearing.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a device and a method for measuring the equivalent friction coefficient of a deep groove ball bearing and a cylindrical roller bearing. The rolling bearing of the invention particularly refers to a deep groove ball bearing and a cylindrical roller bearing. The measured rolling bearing is abstracted into a virtual radial sliding bearing with a sliding matching surface passing through the center of the rolling body of the measured rolling bearing, namely the virtual radial sliding bearing is a virtual radial sliding bearing with a sliding matching surface passing through the center of the rolling body of the measured rolling bearing, and an inner ring of the virtual radial sliding bearing and an outer ring of the virtual radial sliding bearing form a sliding friction pair at the sliding matching surface. And under the same measurement working condition with the corresponding measured rolling bearing, the friction power consumption of the sliding friction pair is equal to the friction power consumption of the measured rolling bearing, the friction power of the sliding friction pair is equal to the product of the sliding friction torque of the sliding friction pair and the rotation angular speed of the virtual radial sliding bearing, and the sliding friction torque of the sliding friction pair is equal to the product of the radius R of the sliding matching surface, the radial load at the sliding matching surface and the friction coefficient of the sliding friction pair. And recording the sliding friction torque of the sliding friction pair as the equivalent friction torque of the tested rolling bearing, and recording the sliding friction coefficient of the sliding friction pair as the equivalent friction coefficient of the tested rolling bearing. The equivalent friction coefficient objectively reflects the manufacturing quality and the cleaning degree of the rolling bearing to be tested, and belongs to the inherent characteristics of the rolling bearing to be tested. The device for measuring the equivalent friction coefficient of the rolling bearing has the capability of quickly and precisely measuring the equivalent friction torque and the equivalent friction coefficient of the rolling bearing.
In order to solve the technical problem, the invention provides a rolling bearing equivalent friction coefficient measuring device which comprises a machine body, a sliding seat, two air-floating main shaft assemblies, a mandrel, a rotating speed sensor and a data acquisition/processing/calculating/displaying system, wherein the sliding seat is arranged on the machine body; the air-floating main shaft assembly comprises an air-floating main shaft substrate and an air-floating main shaft; one of the two air-floatation main shaft matrixes is fixedly connected with the machine body, the other one of the two air-floatation main shaft matrixes is fixedly connected with the sliding seat, and the two air-floatation main shafts are coaxial; two ends of the mandrel are respectively connected with the two air floatation main shafts through conical surface matching or a coupler, and the mandrel is coaxial with the two air floatation main shafts; the mandrel is provided with a shaft shoulder for mounting an inner ring of the rolling bearing to be tested; the sliding seat is driven by external force to translate along the axial direction of the air floatation main shaft; the parts including the two air-floatation main shaft assemblies, the core shaft and the rolling bearing to be measured form a rotary shaft system of the measuring device, and moving parts on the rotary shaft system comprise the two air-floatation main shafts, the core shaft, an inner ring of the rolling bearing to be measured, a rolling body of the rolling bearing to be measured and a retainer of the rolling bearing to be measured; the rotating speed sensor is used for monitoring the angular speed of the mandrel or the air floatation main shaft; the data acquisition/processing/calculation/display system is used for acquiring and processing the angular speed signal of the mandrel or the air floatation main shaft acquired and monitored by the rotating speed sensor, and calculating and displaying the equivalent friction torque and the equivalent friction coefficient of the rolling bearing to be tested.
In the invention, the rotary shaft system is preferably in a horizontal layout, and the axis of the air floatation main shaft is parallel to the horizontal plane.
When the device for measuring the equivalent friction coefficient of the rolling bearing is used for measuring the equivalent friction coefficient, a power device is required to be arranged, an output shaft of the power device is connected with or separated from the free end of one air floatation main shaft through a clutch device, a radial loading device is arranged in the radial direction of the rolling bearing to be measured, and the measuring method comprises the following steps:
step one, mounting an inner ring of a rolling bearing to be tested at a shaft shoulder of a mandrel; connecting two ends of the mandrel with the two air floatation main shafts respectively through conical surface matching or a coupler;
step two, according to the type and the size of the rolling bearing to be tested, and according to the rolling bearing friction torque measurement specification, applying a specified radial load to the outer ring of the rolling bearing to be tested by using a radial loading device;
driving one of the air floatation main shafts to rotate by the power device through the clutch device, and keeping the air floatation main shafts, the core shaft and the inner ring of the rolling bearing to be tested to synchronously rotate; the data acquisition/processing/calculation/display system acquires and processes the angular velocity signal of the mandrel or the air floatation main shaft from the rotating speed sensor, and calculates and displays the angular velocity of the mandrel;
step four, gradually increasing the rotation speed of the air floatation main shaft and the mandrel to a given value, after the operation speed is stable, separating an output shaft of the power device from the air floatation main shaft by a clutch device, gradually attenuating the rotation speed of the air floatation main shaft and the mandrel under the action of the friction power consumption of the tested rolling bearing until the air floatation main shaft and the mandrel stop rotating, and obtaining the numerical relation between the angular speed of the mandrel and the time by a data acquisition/processing/calculation/display system;
calculating the motion speed and the kinetic energy of all moving parts on the rotary shaft system by the data acquisition/processing/calculation/display system to obtain the numerical relation between the total kinetic energy of the rotary shaft system and time; the numerical relation of the total kinetic energy of the rotating shaft system to the time is derived, and the derivative of the numerical relation of the total kinetic energy of the rotating shaft system to the time at a certain moment is the reduction rate of the total kinetic energy of the rotating shaft system and is also the friction power of the tested rolling bearing at the angular speed corresponding to the moment; the quotient obtained by dividing the friction power of the tested rolling bearing by the angular velocity value is equivalent friction torque of the tested rolling bearing under the angular velocity, and the quotient obtained by dividing the equivalent friction torque of the tested rolling bearing by the product of the radius R of the sliding matching surface of the virtual radial sliding bearing corresponding to the tested rolling bearing and the radial load at the sliding matching surface is equivalent friction coefficient of the tested rolling bearing under the angular velocity;
when the angular velocities of the air floatation main shaft and the mandrel tend to zero, the corresponding equivalent friction torque and the equivalent friction coefficient are equivalent to the starting equivalent friction torque and the starting equivalent friction coefficient of the tested rolling bearing.
Compared with the prior art, the invention has the beneficial effects that:
on one hand, the angular speed measurement accuracy of the rotating speed sensor is far higher than that of a micro-force or micro-moment sensor adopted by a traditional rolling bearing friction torque measurement device; on the other hand, all moving parts on the rotating shaft system have regular geometric shapes, known highly accurate sizes and masses, definite moving modes and accurate moving speeds, so that the total kinetic energy of the rotating shaft system has high calculation accuracy. Therefore, the equivalent friction torque and the equivalent friction coefficient of the rolling bearing to be measured have extremely high measurement/calculation accuracy.
Furthermore, the invention can also improve the initial kinetic energy of the rotating shaft system, prolong the attenuation time of the angular velocity of the rotating shaft system and further improve the measurement precision of the angular velocity of the rotating shaft system by increasing the mass of the moving element on the rotating shaft system, thereby improving the measurement/calculation precision of the equivalent friction torque and the equivalent friction coefficient of the tested rolling bearing.
Drawings
FIG. 1-1 is a schematic view of a construction of a ball bearing for depth measurement;
FIG. 1-2 is a schematic view of a virtual sliding bearing of the depth groove ball bearing shown in FIG. 1-1;
FIG. 2-1 is a schematic structural view of a cylindrical roller bearing to be tested;
FIG. 2-2 is a schematic view of a virtual sliding bearing of the cylindrical roller bearing under test shown in FIG. 2-1;
FIG. 3 is a partial structural view of a rolling bearing equivalent friction coefficient measuring apparatus;
in the figure:
1-inner ring;
2-outer ring;
3-rolling elements;
4-the inner ring of the virtual radial plain bearing;
5-an outer ring of a virtual radial sliding bearing;
6-sliding mating surface;
7-a fuselage;
8-a slide seat;
9-air-floating main shaft substrate;
10-an air floatation main shaft;
11-a mandrel;
12-shaft shoulder.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples. The embodiments described by referring to the drawings are exemplary and intended to be illustrative of the invention and are not to be construed as limiting the invention. The dimensions, materials, shapes, relative arrangements, and the like of the constituent components described in the following embodiments are not intended to limit the scope of the present invention to these unless otherwise specifically indicated.
The rolling bearing referred to in the present invention includes a deep groove ball bearing and a cylindrical roller bearing, and fig. 1-1 shows the structure of the deep groove ball bearing, and fig. 2-1 shows the structure of the cylindrical roller bearing. In the invention, the rolling bearing to be tested is abstracted into a virtual radial sliding bearing with a sliding matching surface 6 passing through the center of the rolling body 3 of the rolling bearing to be tested, namely the virtual radial sliding bearing is a virtual radial sliding bearing with a sliding matching surface 6 passing through the center of the rolling body 3 of the rolling bearing to be tested, the virtual sliding bearing corresponding to the depth groove ball bearing to be tested shown in figure 1-1 is shown in figure 1-2, the virtual sliding bearing corresponding to the cylindrical roller bearing to be tested shown in figure 2-1 is shown in figure 2-2, and the inner ring 4 of the virtual radial sliding bearing and the outer ring 5 of the virtual radial sliding bearing form a sliding friction pair at the sliding matching surface 6. And under the same measurement working condition with the corresponding measured rolling bearing, the friction power consumption of the sliding friction pair is equal to the friction power consumption of the measured rolling bearing, the friction power of the sliding friction pair is equal to the product of the sliding friction torque of the sliding friction pair and the rotation angular speed of the virtual radial sliding bearing, and the sliding friction torque of the sliding friction pair is equal to the product of the radius R of the sliding matching surface, the radial load at the sliding matching surface and the friction coefficient of the sliding friction pair. And recording the sliding friction torque of the sliding friction pair as the equivalent friction torque of the tested rolling bearing, and recording the sliding friction coefficient of the sliding friction pair as the equivalent friction coefficient of the tested rolling bearing.
Fig. 3 shows a rolling bearing equivalent friction coefficient measuring device proposed by the present invention, which includes a body 7, a slide 8, two air spindle assemblies, a spindle 11, a rotation speed sensor (not shown), and a data acquisition/processing/calculating/displaying system (not shown).
The air floatation main shaft assembly comprises an air floatation main shaft substrate 9 and an air floatation main shaft 10; one of the two air-floating main shaft matrixes 9 is fixedly connected with the machine body 7, the other one of the two air-floating main shaft matrixes is fixedly connected with the sliding seat 8, and the two air-floating main shafts 10 are coaxial; two ends of the mandrel 11 are respectively connected with the two air-floating main shafts 10 through conical surface matching or a coupler, and the mandrel 11 is coaxial with the two air-floating main shafts 10; the mandrel 11 is provided with a shaft shoulder 12 for mounting the inner ring 1 of the rolling bearing to be tested; the sliding seat 8 is driven by external force to translate along the axial direction of the air floatation spindle 10; the parts including the two air-floating main shaft assemblies, the mandrel 11 and the rolling bearing to be measured form a rotary shaft system of the measuring device of the invention, and moving parts on the rotary shaft system comprise the two air-floating main shafts 10, the mandrel 11, an inner ring 1 of the rolling bearing to be measured, a rolling body 3 of the rolling bearing to be measured and a retainer (not shown in the figure) of the rolling bearing to be measured; if the mandrel 11 is connected with the two air-floating main shafts 10 through a coupler, the rotary shaft system further comprises the coupler, and the moving part on the rotary shaft system further comprises the coupler; the rotation speed sensor is used for monitoring the angular speed of the mandrel 11 or the air floatation main shaft 10; the data acquisition/processing/calculation/display system is used for acquiring and processing the angular speed signal of the mandrel 11 or the air-floating main shaft 10 monitored by the rotating speed sensor, and calculating and displaying the equivalent friction torque and the equivalent friction coefficient of the rolling bearing to be tested.
In the invention, the rotary shaft system is preferably in a horizontal layout, and the axis of the air floatation main shaft 10 is parallel to the horizontal plane.
When the equivalent friction coefficient measuring device of the rolling bearing is used for measuring the equivalent friction coefficient, a power device is required to be arranged, an output shaft of the power device is connected with or separated from the free end of one of the air floatation main shafts 10 through a clutch device, a radial loading device is arranged in the radial direction of the rolling bearing to be measured, and the positions and the connection relations of the power device, the clutch device and the radial loading device and relevant parts in the measuring device are known in the field, so the positions and the connection relations of the power device, the clutch device and the radial loading device and relevant parts in the measuring device are not drawn in the drawing.
The working principle of the rolling bearing equivalent friction coefficient measuring device is as follows: under the condition that a radial loading device applies a specified radial load to the outer ring 2 of the rolling bearing to be detected, a power device drives one of the air floatation main shafts 10 to rotate through a clutch device, the clutch device separates an output shaft of the power device from the air floatation main shaft 10 after the air floatation main shaft 10 and the mandrel 11 rotate to a given rotation angular velocity, and a rotation speed sensor monitors the angular velocity of the air floatation main shaft 10 of the mandrel 11 until the air floatation main shaft 10 and the mandrel 11 stop rotating; the data acquisition/processing/calculation/display system obtains a numerical relation of 'angular velocity of a mandrel-time', calculates the motion velocity and the kinetic energy of all moving parts on the rotary shaft system and obtains a numerical relation of 'total kinetic energy of the rotary shaft system-time'; deriving a numerical relation of 'total kinetic energy of a rotating shaft system-time', wherein the derivative of the numerical relation of the total kinetic energy of the rotating shaft system-time to time at a certain moment is the reduction rate of the total kinetic energy of the rotating shaft system, and is the friction power of the tested rolling bearing at the angular velocity corresponding to the moment, and is also equal to the friction power of a sliding friction pair of the corresponding virtual radial sliding bearing; the quotient obtained by dividing the friction power of the sliding friction pair by the angular velocity value is the equivalent friction torque of the sliding friction pair at the angular velocity, which is also equivalent to the equivalent friction torque of the tested rolling bearing at the angular velocity; the quotient obtained by dividing the friction torque of the sliding friction pair at the angular speed by the product of the radius R of the sliding fit surface of the virtual radial sliding bearing and the radial load at the sliding fit surface is the friction coefficient of the sliding friction pair at the angular speed, and is also equivalent to the equivalent friction coefficient of the tested rolling bearing at the angular speed; when the angular velocities of the air floatation main shaft 10 and the mandrel 11 tend to zero, the corresponding equivalent friction torque and the equivalent friction coefficient are equivalent to the starting equivalent friction torque and the starting equivalent friction coefficient of the tested rolling bearing.
The invention also provides a method for measuring the equivalent friction coefficient of the rolling bearing, which comprises the following steps:
firstly, mounting an inner ring 1 of a rolling bearing to be tested at a shaft shoulder 12 of a mandrel 11; two ends of a mandrel 11 are respectively connected with two air-floating main shafts 10 through conical surface matching (or connected with the two air-floating main shafts 10 through a coupler);
step two, according to the type and the size of the rolling bearing to be tested, and according to the rolling bearing friction torque measurement specification, applying a specified radial load to the outer ring 2 of the rolling bearing to be tested by using a radial loading device;
thirdly, the power device drives one of the air floatation main shafts 10 to rotate through the clutch device, and the air floatation main shaft 10, the mandrel 11 and the inner ring 1 of the rolling bearing to be tested keep rotating synchronously; the data acquisition/processing/calculation/display system acquires and processes angular velocity signals of the mandrel 11 or the air floatation main shaft 10 from the rotating speed sensor, and calculates and displays the angular velocity of the mandrel 11;
gradually increasing the rotation speed of the air-floating main shaft 10 and the mandrel 11 to a given value and stably operating, separating an output shaft of the power device from the air-floating main shaft 10 by a clutch device, gradually attenuating the rotation speed of the air-floating main shaft 10 and the mandrel 11 under the action of the friction power consumption of the tested rolling bearing until the air-floating main shaft 10 and the mandrel 11 stop rotating, and obtaining the numerical relation of 'mandrel angular speed-time' by a data acquisition/processing/calculation/display system;
calculating the motion speed and the kinetic energy of all moving parts on the rotary shaft system by the data acquisition/processing/calculation/display system to obtain a numerical relation of total kinetic energy of the rotary shaft system and time; deriving a numerical relation of 'total kinetic energy of a rotating shaft system-time', wherein the derivative of the numerical relation of the total kinetic energy of the rotating shaft system-time to time at a certain moment is the reduction rate of the total kinetic energy of the rotating shaft system and is also the friction power of the tested rolling bearing at the angular speed corresponding to the moment; the quotient obtained by dividing the friction power of the tested rolling bearing by the angular velocity value is equivalent friction torque of the tested rolling bearing under the angular velocity, and the quotient obtained by dividing the equivalent friction torque of the tested rolling bearing by the product of the radius R of the sliding fit surface of the virtual radial sliding bearing corresponding to the tested rolling bearing and the radial load at the sliding fit surface 6 is equivalent friction coefficient of the tested rolling bearing under the angular velocity;
when the angular velocities of the air floatation main shaft 10 and the mandrel 11 tend to zero, the corresponding equivalent friction torque and the equivalent friction coefficient are equivalent to the starting equivalent friction torque and the starting equivalent friction coefficient of the tested rolling bearing.
Claims (4)
1. A rolling bearing equivalent friction coefficient measuring device comprises a machine body (7), a sliding seat (8), two air-floating main shaft assemblies, a core shaft (11), a rotating speed sensor and a data acquisition/processing/calculating/displaying system; it is characterized in that the preparation method is characterized in that,
the air floatation main shaft assembly comprises an air floatation main shaft base body (9) and an air floatation main shaft (10); one of the two air-floating main shaft matrixes (9) is fixedly connected with the machine body (7), the other one of the two air-floating main shaft matrixes is fixedly connected with the sliding seat (8), and the two air-floating main shafts (10) are coaxial; two ends of the mandrel (11) are respectively connected with the two air-floatation main shafts (10) through conical surface matching or a coupler, and the mandrel (11) is coaxial with the two air-floatation main shafts (10); a shaft shoulder (12) for installing an inner ring (1) of the rolling bearing to be tested is arranged on the mandrel (11); the sliding seat (8) translates along the axial direction of the air floatation main shaft (10) under the driving of external force;
the measuring device is also provided with a power device, an output shaft of the power device is connected with or separated from the free end of one of the air-floating main shafts (10) through a clutch device, a radial loading device is arranged in the radial direction of the measured rolling bearing, parts including two air-floating main shaft components, a mandrel (11) and the measured rolling bearing jointly form a rotary shaft system of the rolling bearing equivalent friction coefficient measuring device, and moving parts on the rotary shaft system comprise the two air-floating main shafts (10), the mandrel (11), an inner ring (1) of the measured rolling bearing, a rolling body (3) of the measured rolling bearing and a retainer of the measured rolling bearing;
the rotating speed sensor is used for monitoring the angular speed of the mandrel (11) or the air floatation main shaft (10);
the data acquisition/processing/calculation/display system is used for acquiring and processing the angular velocity signals of the mandrel (11) or the air floatation main shaft (10) monitored by the rotating speed sensor to obtain the numerical relationship between the angular velocity of the mandrel and time, calculating the motion velocity and the kinetic energy of all moving parts on the rotary shaft system and obtaining the numerical relationship between the total kinetic energy of the rotary shaft system and the time; the numerical relation of the total kinetic energy of the rotating shaft system to the time is derived, and the derivative of the numerical relation of the total kinetic energy of the rotating shaft system to the time at a certain moment is the reduction rate of the total kinetic energy of the rotating shaft system and is also the friction power of the tested rolling bearing at the angular speed corresponding to the moment; abstracting the tested rolling bearing into a virtual radial sliding bearing with a sliding matching surface (6) passing through the center of a rolling body (3) of the tested rolling bearing, namely the virtual radial sliding bearing is a virtual radial sliding bearing with a sliding matching surface (6) passing through the center of the rolling body (3) of the tested rolling bearing; the friction power of the rolling bearing to be tested at a certain angular speed is equivalent to the friction power of a sliding friction pair of the corresponding virtual radial sliding bearing; the quotient obtained by dividing the friction power of the sliding friction pair by the angular velocity value of the rolling bearing to be measured is the friction torque of the sliding friction pair at the angular velocity, and is also equivalent to the equivalent friction torque of the rolling bearing to be measured at the angular velocity; the quotient obtained by dividing the friction torque of the sliding friction pair at the angular speed by the product of the radius R of the sliding matching surface and the radial load at the sliding matching surface (6) is the friction coefficient of the sliding friction pair at the angular speed, and is also equal to the equivalent friction coefficient of the tested rolling bearing at the angular speed; and the data acquisition/processing/calculation/display system calculates and displays the equivalent friction torque and the equivalent friction coefficient of the rolling bearing to be measured.
2. Rolling bearing equivalent friction coefficient measuring device according to claim 1, characterized in that the air-floating main shaft (10) is in a horizontal layout, and the axis of the air-floating main shaft (10) is parallel to the horizontal plane.
3. A rolling bearing equivalent friction coefficient measuring method, characterized by using the rolling bearing equivalent friction coefficient measuring device according to claim 1 or 2, comprising the steps of:
step one, an inner ring (1) of a rolling bearing to be tested is arranged at a shaft shoulder (12) of a mandrel (11); two ends of a mandrel (11) are respectively connected with two air-floating main shafts (10) through conical surface matching or a coupler;
step two, according to the type and the size of the rolling bearing to be tested, and according to the rolling bearing friction torque measurement specification, applying a specified radial load to the outer ring (2) of the rolling bearing to be tested by using a radial loading device;
thirdly, the power device drives one of the air floatation main shafts (10) to rotate through the clutch device, and the air floatation main shafts (10), the mandrel (11) and the inner ring (1) of the rolling bearing to be tested keep rotating synchronously; the data acquisition/processing/calculation/display system acquires and processes angular speed signals of a mandrel (11) or an air floatation main shaft (10) from a rotating speed sensor, and calculates and displays the angular speed of the mandrel (11);
step four, gradually increasing the rotation speed of the air floatation main shaft (10) and the mandrel (11) to a given value, after the operation speed is stable, separating an output shaft of the power device from the air floatation main shaft (10) by a clutch device, gradually attenuating the rotation speed of the air floatation main shaft (10) and the mandrel (11) under the action of the friction power consumption of the tested rolling bearing until the air floatation main shaft (10) and the mandrel (11) stop rotating, and obtaining the numerical relation between the angular speed and the time of the mandrel by a data acquisition/processing/calculation/display system;
calculating the motion speed and the kinetic energy of all moving parts on the rotary shaft system by the data acquisition/processing/calculation/display system to obtain the numerical relation between the total kinetic energy of the rotary shaft system and time; the numerical relation of the total kinetic energy of the rotating shaft system to the time is derived, and the derivative of the numerical relation of the total kinetic energy of the rotating shaft system to the time at a certain moment is the reduction rate of the total kinetic energy of the rotating shaft system and is also the friction power of the tested rolling bearing at the angular speed corresponding to the moment; the quotient obtained by dividing the friction power of the tested rolling bearing by the angular velocity value is equivalent friction torque of the tested rolling bearing under the angular velocity, and the quotient obtained by dividing the equivalent friction torque of the tested rolling bearing by the product of the radius R of the sliding matching surface of the virtual radial sliding bearing corresponding to the tested rolling bearing and the radial load at the sliding matching surface (6) is equivalent friction coefficient of the tested rolling bearing under the angular velocity;
when the angular velocities of the air floatation main shaft (10) and the mandrel (11) tend to zero, the corresponding equivalent friction torque and the equivalent friction coefficient are equivalent to the starting equivalent friction torque and the starting equivalent friction coefficient of the tested rolling bearing.
4. A rolling bearing equivalent friction coefficient measuring method according to claim 3, wherein the virtual radial sliding bearing is a virtual radial sliding bearing whose sliding fit surface (6) passes through the center of the rolling element (3) of the rolling bearing to be measured, and the inner ring (4) of the virtual radial sliding bearing and the outer ring (5) of the virtual radial sliding bearing constitute a sliding friction pair at the sliding fit surface (6); the virtual radial sliding bearing is under the same measuring working condition with the corresponding measured rolling bearing, the friction power consumption of the sliding friction pair is equal to the friction power consumption of the measured rolling bearing, the friction power of the sliding friction pair is equal to the product of the sliding friction torque of the sliding friction pair and the rotation angular speed of the virtual radial sliding bearing, and the sliding friction torque of the sliding friction pair is equal to the product of the radius R of the sliding matching surface, the radial load at the sliding matching surface (6) and the friction coefficient of the sliding friction pair; and recording the sliding friction torque of the sliding friction pair as equivalent friction torque corresponding to the rolling bearing to be tested, and recording the sliding friction coefficient of the sliding friction pair as equivalent friction coefficient corresponding to the rolling bearing to be tested.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811283190.7A CN109238709B (en) | 2018-10-31 | 2018-10-31 | Device and method for measuring equivalent friction coefficient of rolling bearing |
| JP2021537465A JP7043712B2 (en) | 2018-10-31 | 2019-10-29 | Measuring device and method of equivalent friction coefficient of rolling bearing |
| PCT/CN2019/113880 WO2020088431A1 (en) | 2018-10-31 | 2019-10-29 | Device for measuring equivalent friction coefficient of rolling bearing |
| US17/239,656 US20210278337A1 (en) | 2018-10-31 | 2021-04-25 | Equivalent friction coefficient measurement apparatus for rolling bearings and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811283190.7A CN109238709B (en) | 2018-10-31 | 2018-10-31 | Device and method for measuring equivalent friction coefficient of rolling bearing |
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| CN109238709A CN109238709A (en) | 2019-01-18 |
| CN109238709B true CN109238709B (en) | 2020-09-01 |
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| WO2020088431A1 (en) * | 2018-10-31 | 2020-05-07 | 天津大学 | Device for measuring equivalent friction coefficient of rolling bearing |
| CN112484891B (en) * | 2020-12-09 | 2022-05-31 | 合肥通用机械研究院有限公司 | Dynamic seal contact surface friction rotation torque measuring device |
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| CN208999097U (en) * | 2018-10-31 | 2019-06-18 | 天津大学 | A kind of rolling bearing equlvalent coefficient of friction measuring device |
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| JPH02162241A (en) * | 1988-12-15 | 1990-06-21 | Kubota Ltd | Method for measuring friction coefficient of bearing |
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