CN104132886A - Device for testing friction coefficient of precision bearing ball and cage pocket - Google Patents
Device for testing friction coefficient of precision bearing ball and cage pocket Download PDFInfo
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- CN104132886A CN104132886A CN201410197816.8A CN201410197816A CN104132886A CN 104132886 A CN104132886 A CN 104132886A CN 201410197816 A CN201410197816 A CN 201410197816A CN 104132886 A CN104132886 A CN 104132886A
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Abstract
The invention relates to a device for testing the friction coefficient of a precision bearing ball and a cage pocket. The device includes a loading mechanism supported by an air flotation linear guide rail and a torque measurement mechanism supported by an air flotation bearing. For the loading mechanism, a steel ball and a motor shaft are in rigid connection, a motor is fixed at one end of the air flotation linear guide rail, and the other end is provided with a force sensor, a differential head fixed on a bracket jacks up the force sensor through screw transmission, the pressure is transferred to the motor shaft through the air flotation linear guide rail and is then transferred to a contact surface of the steel ball and the cage ball pocket, and the loading mechanism is fixed on a three-dimensional mobile platform; and for the torque measurement mechanism, one end of the air flotation bearing rotation shaft is connected to half the ball pocket of the cage, and the other end is connected to a torque sensor. The device provided by the invention can accurately and effectively test the tiny friction coefficient of the precision bearing ball and the cage pocket at different contact positions and under different lubrication states, different material pairs and different working conditions.
Description
Technical field
The present invention relates to precise rolling bearing friction field, be specially the testing device for friction coefficient in a kind of precision bearing ball and retainer pocket hole.
Background technology
Rolling bearing is a kind of assembly of supporting rotating shaft, is widely used in the every field of machinery industry.Rolling bearing has the feature of low friction, but its inside still exists complicated friction phenomenon, the sliding friction that wherein steel ball contacts with raceway and the sliding friction between steel ball and retainer be loss of energy not only, the more important thing is that producing large wearing and tearing makes bearing lose precision.
The inertia type instrument on manned spaceship, satellite, aircraft, guided missile and navigation naval vessel all detects flight attitude, ship orientation and angular velocity with gyroscope, and in the inertial navigation system of these carriers, gyroscope is extremely important sensor.Critical component in gyroscope is the gyrorotor bearing of supporting gyro motor rotor and the gyro gimbal bearing of supporting gyro gimbal, gyro gimbal bearing and high precision, long-life gyrorotor bearing highly sensitive, low friction moment are the key factors of the above-mentioned carrier of impact and weaponry orientation and positioning system, and the sliding friction between bearing parts is the basic reason that causes above-mentioned precision instrument bearing accuracy to lose efficacy.Therefore, the coefficient of sliding friction is the important parameter of bearing theoretical analysis and experimental study.At present, the existing lot of experiments of sliding friction that between simulation bearing ball and raceway, some contact is studied, as typical ball-dish testing machine.But the experimental study to sliding friction between precision instrument bearing ball and retainer have not been reported, main cause is that less being not easy of the sliding friction of ball and retainer measured, in non-precision bearing, be conventionally left in the basket, and in sensitive ball bearing, the sliding friction of ball and retainer can not be ignored the impact of bearing total frictional force square.This is proposed to a kind of device of testing precision bearing ball and retainer pocket hole friction factor, realize bearing ball from retainer pocket hole in different contacts site, Different Lubrication Conditions Used, different materials is joined the PVvalue testing under pair and different working conditions.
Summary of the invention
The object of the invention is in order to overcome precision bearing ball and retainer friction factor is little, be difficult for the technological deficiency of measuring, propose the testing device for friction coefficient in a kind of precision bearing ball and retainer pocket hole, realize and testing easily and accurately at different working condition lower bearing balls and ball pocket friction factor.
For achieving the above object, design of the present invention is: the sliding friction of bearing ball and retainer ball pocket, and according to the eccentric throw of added power, contact position with record moment of torsion and just can calculate the friction factor of surface of contact.For make to load and the measurement of moment of torsion more accurate, employing can think that zero air supporting line slideway and the air-bearing shafts rubbing make as support system.Bearing ball is connected with motor, and motor is directly fixed on the guide rod of air supporting line slideway, convenient loading, and adopt differential head worm drive pressure on top surface sensor, can realize definite value and load.Air supporting line slideway is fixed on three-dimensional mobile platform, can realize the movement in three directions of loading system, thereby can make bearing ball contact at different parts (ball pocket inside or edge) with retainer ball pocket.Torque sensor and air-bearing stator are fixed in the seat hole bearing of coaxial inner conductor.Air-bearing bears ball and contacts the radial force producing with retainer, and torque sensor only bears moment of torsion, can avoid torque sensor bear additional load and damage.Ball and retainer ball pocket bond with coupling shaft respectively, change the material of above-mentioned bearing parts and bond with new coupling shaft, can test different materials and join the friction factor between pair.
According to foregoing invention design, reach by following technical solution goal of the invention:
The testing device for friction coefficient in precision bearing ball and retainer pocket hole, comprises load maintainer and torque measuring mechanism, it is characterized in that: described load maintainer and torque measuring mechanism are supported by air supporting line slideway and air-bearing respectively; Load maintainer is tested steel ball and a coupling shaft bonding, this coupling shaft is connected with the rotating shaft of a motor, this motor is fixed on one end of air supporting line slideway, and the other end of air supporting line slideway is installed a power sensor, be fixed on a differential head on a support by worm drive pressure on top surface sensor; Differential head passes in the rotating shaft of motor through air supporting line slideway through the pressure of pressure transducer, and then is delivered on the surface of contact of steel ball and retainer ball pocket; Described torque measuring mechanism is a retainer ball pocket and another root coupling shaft bonding, then be connected with rotating shaft one end of air-bearing, this rotating shaft other end is connected with a torque sensor by a shaft coupling, and the stator of this torque sensor and air-bearing is fixed in the bearing in a coaxial inner conductor seat hole; The moving direction of described air supporting line slideway is perpendicular to electrical axis; Motor drives steel ball to rotate, and steel ball passes to torque sensor with the moment of torsion of retainer ball pocket sliding friction generation by air-bearing, according to the eccentric throw of added pressure, contact position with record moment of torsion and just can calculate the friction factor of surface of contact.
Described support is fixed on a three-dimensional mobile platform together with air supporting line slideway, by three directional trims, can realize contacting of steel ball and retainer ball pocket different parts.
Described steel ball and coupling shaft bonding, this coupling shaft end face is processed tapered hole, to guarantee the centre of sphere and axial line centering, and bores straight hole to the other end of axle from one end of bellmouth, and this hole coordinates with motor shaft, and the processing in axle and hole completes under clamped one time.
The hole that described coupling shaft coordinates with machine shaft is circumferentially evenly arranged three holding screws, to regulate the centering of coupling shaft and machine shaft.
Described ball pocket and coupling shaft bonding, the end face of coupling shaft is processed bellmouth equally to guarantee retainer Qiu Dou center and coupling shaft axial line centering, and the rotating shaft tight fit connection of the other end of described coupling shaft and air-bearing is with transmitting torque.
Described torque sensor and air-bearing are fixed in the bearing in coaxial inner conductor seat hole, and air-bearing bears radial force the transmitting torque acting on retainer ball pocket like this, and torque sensor only bears moment of torsion.Due to gas suspension, the friction of moment of torsion in transmittance process can be ignored.
Described three-dimensional mobile platform and bearing are arranged on above pedestal; During assembling, take upper surface and the long limit of pedestal is benchmark, guarantees that the axis in seat hole in described bearing is parallel with reference edge, guarantees that described air supporting line slideway is vertical with reference edge and parallel with reference field, thus assurance motor shaft and air-bearing shaft parallel.
The present invention compared with the prior art, has following outstanding substantive distinguishing features and significant advantage:
The present invention is owing to having adopted air supporting line slideway and air-bearing supporting, and the friction in power and moment of torsion transmittance process can be ignored.Can test accurately and efficiently precision bearing ball and different contacts site, retainer pocket hole, Different Lubrication Conditions Used, different materials is joined the Micro-friction coefficient under secondary and different working conditions.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of ball and coupling shaft in the present invention;
Fig. 3 is the structural representation of retainer ball pocket and coupling shaft in the present invention;
Fig. 4 is the structural representation of differential head bracket in the present invention;
Fig. 5 is the structural representation of torque sensor and air-bearing rotating shaft shaft coupling in the present invention.
Fig. 6 is the structural representation of air-bearing and torque sensor bearing in the present invention.
Embodiment
Details are as follows by reference to the accompanying drawings for the preferred embodiments of the present invention:
Embodiment mono-:
Referring to Fig. 1, the testing device for friction coefficient in a kind of precision bearing ball and retainer pocket hole, comprise load maintainer (I) and torque measuring mechanism (II), it is characterized in that: described load maintainer (I) and torque measuring mechanism (II) are respectively by air supporting line slideway (12) and air-bearing (5) supporting; Load maintainer (I) is tested steel ball (8) and a coupling shaft (9) bonding, this coupling shaft (9) is connected with the rotating shaft of a motor (10), this motor (10) is fixed on one end of air supporting line slideway (12), and the other end of air supporting line slideway (12) is installed a power sensor (14), be fixed on a differential head (16) on a support (15) by worm drive pressure on top surface sensor (14); Differential head (16) passes in the rotating shaft of motor (10) through air supporting line slideway (12) through the pressure of pressure transducer (14), and then is delivered on the surface of contact of steel ball (8) and retainer ball pocket (7); Described torque measuring mechanism (II) is a retainer ball pocket (7) and another root coupling shaft (6) bonding, then be connected with rotating shaft one end of air-bearing (5), this rotating shaft other end is connected with a torque sensor (3) by a shaft coupling (4), and this torque sensor (3) is fixed in the bearing (2) in a coaxial inner conductor seat hole with the stator of air-bearing (5); The moving direction of described air supporting line slideway (12) is perpendicular to motor (10) axis; Motor (10) drives steel ball (8) to rotate, the moment of torsion that steel ball (8) and retainer ball pocket (7) sliding friction produce passes to torque sensor (3) by air-bearing (5), according to the eccentric throw of added pressure, contact position with record moment of torsion and just can calculate the friction factor of surface of contact.
Embodiment bis-:
Referring to Fig. 1～Fig. 6, the present embodiment and embodiment mono-are basic identical, and special feature is as follows:
Described support (15) is fixed on a three-dimensional mobile platform (17) together with air supporting line slideway (12); By three directional trims of three-dimensional mobile platform (17), can realize contacting of steel ball (8) and retainer ball pocket (7) different parts.Described steel ball (8) and coupling shaft (9) bonding, this coupling shaft (9) end face is processed tapered hole, to guarantee the centre of sphere and axial line centering, and bores straight hole to the other end of axle from one end of bellmouth, this hole coordinates with motor shaft, and the processing in axle and hole completes under clamped one time.Described coupling shaft (9) is circumferentially evenly arranged three holding screws with the hole that motor (10) rotating shaft coordinates, to regulate the centering of coupling shaft (9) and motor (10) rotating shaft.Described retainer ball pocket (7) and coupling shaft (6) bonding, the tapered hole of the same processing of end face of this coupling shaft (6), to guarantee retainer ball pocket (7) center and coupling shaft (6) axial line centering, the rotating shaft tight fit connection of the other end of described coupling shaft (6) and air-bearing (5) is with transmitting torque.Described torque sensor (3) is fixed in the bearing (2) in coaxial inner conductor seat hole with air-bearing (5), air-bearing (5) bears radial force the transmitting torque acting on retainer ball pocket (7) like this, and torque sensor (3) only bears moment of torsion; Due to gas suspension, the friction of moment of torsion in transmittance process can be ignored.Described three-dimensional mobile platform (17) and bearing (2) are arranged on a sewing platform base (1) above; During assembling, take upper surface and the long limit of pedestal (1) is benchmark, the axis that guarantees seat hole in described bearing (2) is parallel with reference edge, guarantee that described air supporting line slideway (12) is vertical with reference edge and parallel with reference field, thereby guarantee motor (10) rotating shaft and air-bearing (5) shaft parallel.
Embodiment tri-:
The present embodiment is: referring to Fig. 1, the testing device for friction coefficient in a kind of precision bearing ball and retainer pocket hole, comprises and loading and torque measuring mechanism.The feature of described load maintainer is: steel ball (8) bonds with cementing agent with coupling shaft (9), referring to Fig. 2, coupling shaft end face processing bellmouth is to guarantee the centre of sphere and axial line centering, and bore straight hole to the other end of axle from one end of bellmouth, this hole coordinates with motor shaft, the processing in axle and hole completes under clamped one time, and bonds with ball on lathe.Coupling shaft (9) is circumferentially evenly arranged three holding screws with the hole that stepper motor (10) axle coordinates, to regulate the centering of coupling shaft and motor shaft, during electric machine rotation, the diameter run-out of steel ball is controlled in 30 μ m.Motor (10) is connected with one end of air supporting line slideway (12) by L-square (11), the other end setting pressure sensor (14) of air supporting line slideway, be fixed on differential head (16) on support (15) by worm drive pressure on top surface sensor, pressure through air supporting line slideway pass on motor shaft so that be delivered to steel ball and the surface of contact of retainer ball pocket (7) on.Described support (15) referring to Fig. 4, is fixed on three-dimensional mobile flat together with air supporting line slideway (12)
On platform (17).Regulate three-dimensional mobile platform can realize contacting of steel ball and retainer pocket hole different parts.
The feature of described torque measuring mechanism is: ball pocket (7) and coupling shaft (6) bonding, referring to Fig. 3, the end face of coupling shaft is processed bellmouth equally to guarantee retainer Qiu Dou center and axial line centering, described coupling shaft (6) is connected with the rotating shaft of air-bearing (5), with holding screw, hold out against with transmitting torque, the other end of air-bearing rotating shaft is connected with torque sensor by shaft coupling (4), and described shaft coupling is referring to Fig. 5.Torque sensor is fixed in coaxial seat hole bearing (2) with air-bearing stator, and described bearing is referring to Fig. 6, and the coaxial gap that also has in the horizontal direction 2～3mm, two holes on bearing, is convenient to install and retaining element.
During assembling, take upper surface and the long limit of pedestal (1) is benchmark, the axis that guarantees seat hole in described bearing (2) is parallel with reference edge, guarantee that described air supporting line slideway (12) is vertical with reference edge and parallel with reference field, thereby guarantee motor (10) axle and air-bearing (5) shaft parallel.
Steel ball (8) contacts generation radial force with ball pocket (7) and because sliding friction produces moment of torsion, air-bearing bears the radial force acting on ball pocket and moment of torsion is passed to torque sensor.According to the eccentric throw of the reading of pressure transducer and torque sensor and contact position (ball pocket inside surface radius), just can calculate the friction factor of surface of contact.
Claims (7)
1. the testing device for friction coefficient in a precision bearing ball and retainer pocket hole, comprise load maintainer (I) and torque measuring mechanism (II), it is characterized in that: described load maintainer (I) and torque measuring mechanism (II) are respectively by air supporting line slideway (12) and air-bearing (5) supporting; Load maintainer (I) is tested steel ball (8) and a coupling shaft (9) bonding, this coupling shaft (9) is connected with the rotating shaft of a motor (10), this motor (10) is fixed on one end of air supporting line slideway (12), and the other end of air supporting line slideway (12) is installed a power sensor (14), be fixed on a differential head (16) on a support (15) by worm drive pressure on top surface sensor (14); Differential head (16) passes in the rotating shaft of motor (10) through air supporting line slideway (12) through the pressure of pressure transducer (14), and then is delivered on the surface of contact of steel ball (8) and retainer ball pocket (7); Described torque measuring mechanism (II) is a retainer ball pocket (7) and another root coupling shaft (6) bonding, then be connected with rotating shaft one end of air-bearing (5), this rotating shaft other end is connected with a torque sensor (3) by a shaft coupling (4), and this torque sensor (3) is fixed in the bearing (2) in a coaxial inner conductor seat hole with the stator of air-bearing (5); The moving direction of described air supporting line slideway (12) is perpendicular to motor (10) axis; Motor (10) drives steel ball (8) to rotate, the moment of torsion that steel ball (8) and retainer ball pocket (7) sliding friction produce passes to torque sensor (3) by air-bearing (5), according to the eccentric throw of added pressure, contact position with record moment of torsion and just can calculate the friction factor of surface of contact.
2. the testing device for friction coefficient in precision bearing ball and retainer pocket hole as claimed in claim 1, is characterized in that: described support (15) is fixed on a three-dimensional mobile platform (17) together with air supporting line slideway (12); By three directional trims of three-dimensional mobile platform (17), can realize contacting of steel ball (8) and retainer ball pocket (7) different parts.
3. the testing device for friction coefficient in precision bearing ball and retainer pocket hole as claimed in claim 1, it is characterized in that: described steel ball (8) and coupling shaft (9) bonding, this coupling shaft (9) end face is processed tapered hole, to guarantee the centre of sphere and axial line centering, and bore straight hole to the other end of axle from one end of bellmouth, this hole coordinates with motor shaft, and the processing in axle and hole completes under clamped one time.
4. the testing device for friction coefficient in precision bearing ball and retainer pocket hole as claimed in claim 3, it is characterized in that: described coupling shaft (9) is circumferentially evenly arranged three holding screws with the hole that motor (10) rotating shaft coordinates, to regulate the centering of coupling shaft (9) and motor (10) rotating shaft.
5. the testing device for friction coefficient in precision bearing ball and retainer pocket hole as claimed in claim 1, it is characterized in that: described retainer ball pocket (7) and coupling shaft (6) bonding, the tapered hole of the same processing of end face of this coupling shaft (6), to guarantee retainer ball pocket (7) center and coupling shaft (6) axial line centering, the rotating shaft tight fit connection of the other end of described coupling shaft (6) and air-bearing (5) is with transmitting torque.
6. the testing device for friction coefficient in precision bearing ball and retainer pocket hole as claimed in claim 1, it is characterized in that: described torque sensor (3) is fixed in the bearing (2) in coaxial inner conductor seat hole with air-bearing (5), air-bearing (5) bears radial force the transmitting torque acting on retainer ball pocket (7) like this, and torque sensor (3) only bears moment of torsion; Due to gas suspension, the friction of moment of torsion in transmittance process can be ignored.
7. the testing device for friction coefficient in precision bearing ball and retainer pocket hole as described in claim 1～6, is characterized in that: described three-dimensional mobile platform (17) and bearing (2) are arranged on a sewing platform base (1) above; During assembling, take upper surface and the long limit of pedestal (1) is benchmark, the axis that guarantees seat hole in described bearing (2) is parallel with reference edge, guarantee that described air supporting line slideway (12) is vertical with reference edge and parallel with reference field, thereby guarantee motor (10) rotating shaft and air-bearing (5) shaft parallel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410197816.8A CN104132886B (en) | 2014-05-12 | 2014-05-12 | Precision bearing ball and the testing device for friction coefficient in retainer pocket hole |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410197816.8A CN104132886B (en) | 2014-05-12 | 2014-05-12 | Precision bearing ball and the testing device for friction coefficient in retainer pocket hole |
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| CN104132886A true CN104132886A (en) | 2014-11-05 |
| CN104132886B CN104132886B (en) | 2017-08-11 |
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| CN201410197816.8A Active CN104132886B (en) | 2014-05-12 | 2014-05-12 | Precision bearing ball and the testing device for friction coefficient in retainer pocket hole |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104677817A (en) * | 2015-01-23 | 2015-06-03 | 上海大学 | Damper brake pad friction coefficient testing bench |
| CN109187330A (en) * | 2018-08-09 | 2019-01-11 | 西安理工大学 | Friction coefficient measurement method under the conditions of a kind of variable working condition |
| CN110160687A (en) * | 2019-05-15 | 2019-08-23 | 哈尔滨理工大学 | Multi-faceted device for pressure measurement |
| CN111175222A (en) * | 2018-11-12 | 2020-05-19 | 中国石油化工股份有限公司 | Friction coefficient testing device |
| CN111189379A (en) * | 2020-01-14 | 2020-05-22 | 大连理工大学 | Inner cavity surface roughness in-situ detection method based on double-point rotational friction |
| CN112198112A (en) * | 2020-11-04 | 2021-01-08 | 洛阳新能轴承制造有限公司 | Detection apparatus for frictional force between driftage bearing spacing block and steel ball |
| CN114876958A (en) * | 2022-05-09 | 2022-08-09 | 青岛理工大学 | Full-wrapping type rolling bearing retainer device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104677817A (en) * | 2015-01-23 | 2015-06-03 | 上海大学 | Damper brake pad friction coefficient testing bench |
| CN109187330A (en) * | 2018-08-09 | 2019-01-11 | 西安理工大学 | Friction coefficient measurement method under the conditions of a kind of variable working condition |
| CN111175222A (en) * | 2018-11-12 | 2020-05-19 | 中国石油化工股份有限公司 | Friction coefficient testing device |
| CN111175222B (en) * | 2018-11-12 | 2022-07-22 | 中国石油化工股份有限公司 | Friction coefficient testing device |
| CN110160687A (en) * | 2019-05-15 | 2019-08-23 | 哈尔滨理工大学 | Multi-faceted device for pressure measurement |
| CN111189379A (en) * | 2020-01-14 | 2020-05-22 | 大连理工大学 | Inner cavity surface roughness in-situ detection method based on double-point rotational friction |
| CN111189379B (en) * | 2020-01-14 | 2021-01-12 | 大连理工大学 | Inner cavity surface roughness in-situ detection method based on double-point rotational friction |
| CN112198112A (en) * | 2020-11-04 | 2021-01-08 | 洛阳新能轴承制造有限公司 | Detection apparatus for frictional force between driftage bearing spacing block and steel ball |
| CN114876958A (en) * | 2022-05-09 | 2022-08-09 | 青岛理工大学 | Full-wrapping type rolling bearing retainer device |
| CN114876958B (en) * | 2022-05-09 | 2023-07-21 | 青岛理工大学 | Full-wrapping type rolling bearing retainer device |
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