CN101509814B - Design method of miniature bearing dynamic friction moment measurement instrument - Google Patents

Design method of miniature bearing dynamic friction moment measurement instrument Download PDF

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Publication number
CN101509814B
CN101509814B CN2008102307841A CN200810230784A CN101509814B CN 101509814 B CN101509814 B CN 101509814B CN 2008102307841 A CN2008102307841 A CN 2008102307841A CN 200810230784 A CN200810230784 A CN 200810230784A CN 101509814 B CN101509814 B CN 101509814B
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measured bearing
bearing
torque sensor
main shaft
load
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CN101509814A (en
Inventor
李建华
符强
马小梅
赖小航
姜维
靳国栋
何晖
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Luoyang Bearing Research Institute Co Ltd
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Luoyang Bearing Science and Technology Co Ltd
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Abstract

The invention relates to a miniature bearing dynamic friction torque measurement instrument. The design principle thereof is that a double-damping compensation system is adopted to reduce disturbance torque; a loaded line is tensioned through a loading weight to load a measured bearing and a damping oil cup is arranged below the loading weight to reduce disturbance; a damping oil cup is also arranged at the front end of a torque sensor and flexible material is sheathed on a deflector rod to relieve impact and avoid the generation of a retardation phenomenon; the measured bearing is installed between an outside seat and a load bar, the loaded line applies load on an inner race of the measured bearing, the outside seat is linked with a main shaft, a motor closed-loop controls constant revolution, the main shaft drives the outside seat and an outer race of the measured bearing to rotate and then drives the inner race to rotate, and the deflector rod pokes the torque sensor to output a voltage signal representing the friction torque of the measured bearing, namely u (t) equals to k.T (t); and the voltage signal is processed by a computer, indicates the friction torque value of the measured bearing in virtue of electric meter indicating value and is output to the computer in the form of voltage indicating value for signal processing analysis and graphic display.

Description

A kind of method for designing of miniature bearing dynamic friction torque measuring instrument
Technical field
The invention belongs to the bearing measuring technical field, especially a kind of method for designing of miniature bearing dynamic friction torque measuring instrument.
Background technology
Bearing frictional torque is divided into starting friction moment and dynamic friction torque.Starting friction moment is meant bearing by the static moment of resistance that will overcome to rotation, and dynamic friction torque is the size and the fluctuation situation of reflection bearing suffered moment of resistance under a certain rotating speed; Therefore, the quality of bearing dynamic friction torque has been represented the quality of bearing dynamic property and the height of bearing quality to a great extent.At home and abroad in the bearing industry, be the necessary instrument that detects bearing dynamic property quality less than 20 rev/mins bearing low speed dynamic friction torque measuring instrument to rotating speed.
At present at home and abroad, the development principle of bearing low speed dynamic friction torque measuring instrument mainly contains three kinds.
First kind of method for driving shaft employing air bearing, the compensation deals of torque signals employing electric bridge developed.Advantage is: air bearing is very little to the interference of measured bearing, and the torque signals of being surveyed has reflected the performance of bearing dynamic friction torque more realistically; Shortcoming is: because very strict to compressed-air actuated quality requirements, need special dehumidifying and cleaner, so the price of a whole set of instrument is higher, and (domestic equipment is more than 300,000 yuan, import instrument is more than 600,000 yuan), the operation and maintenance expense is also very high, and the serviceable life of instrument is not high yet, and using will overhaul after 2 years.
Second kind is to drive measured bearing by the slowspeed machine driven gear, by power bar taut wire measured bearing is loaded, and gathers torque signals by torque sensor.Advantage is: simple in structure, the instrument price is lower, and the operation and maintenance expense is also lower; Shortcoming is:
1) gear operation brings certain interference to measured bearing;
2) steel wire needs experimental measurement with the moment of torsion that the measured bearing twisting brings, and fixed, the compensation of the rower of going forward side by side needs often to change steel wire, demarcates again; Coherence request to the steel wire torsional performance is very tight, otherwise will revise compensation setting;
3) measured bearing is stirred impact that torque sensor brings and hysteresis phenomenon (for the measured bearing of matter, this phenomenon is lighter), to make the signal of moment sensor acquisition and the true moment of bearing that very big error be arranged, this also is the fatal difficult point of this class moment instrument, so this class moment instrument can only be used to measure the bearing that moment is required lower large-size.
The third is that the measured bearing that passes through of external in recent years development drives moving grating, according to moving grating and the signal of quiet grid ratio to producing, and handles the dynamic friction torque of acquisition bearing through the analysis software of special exploitation.Advantage is: the measured torque signals that analyzes is truer, reliable.Shortcoming is:
1) technical difficulty is very big;
2) very high to the manufacturing accuracy and the installation accuracy requirement of dynamic and static grating, the present domestic high-precision like this grating that is difficult to produce is also very tight to the import barrier of China.
For the miniature bearing of bearing bore diameter less than 10 millimeters, generally below 0.1mN.m, minimum is 0.002mN.m to its dynamic friction torque; Therefore very high to precision, the error requirements of moment instrument, the development difficulty is very big.But because high-precision miniature bearing is widely used in space flight, aviation field again, the dynamic friction torque of this class bearing is weighed the examination essential items for inspection of its quality quality often.
Summary of the invention
For addressing the above problem, the present invention proposes a kind of method for designing of miniature bearing dynamic friction torque measuring instrument, two damping compensation systems are adopted in the design of this measuring instrument, can effectively reduce disturbance torque, have improved the precision and the stability of measured bearing running to a great extent.
For achieving the above object, the present invention adopts following technical scheme:
The method for designing of described miniature bearing dynamic friction torque measuring instrument, the design concept of its measuring instrument adopts two damping compensation systems to reduce disturbance torque, promptly by loading counterweight tension loaded line measured bearing is loaded on the one hand, greatly reduce the moment of torsion effect of steel wire, under the loading counterweight, be provided with one simultaneously and load the damping lubricating cup to reduce the loading counterweight rotates generation with measured bearing feedback interference; On the other hand, a damping lubricating cup also is set, on the driving lever of torque sensor and measured bearing, puts flexible material simultaneously to reduce impact that brings when measured bearing is stirred torque sensor and the generation of avoiding hysteresis phenomenon at the torque sensor front end; Measured bearing is installed between outer seat and the load bar, by the loaded line on the load bar measured bearing inner ring is applied load, outer seat connection main shaft, by the motor closed-loop control, constant speed is rotated, main shaft drives outer seat and the rotation of measured bearing outer ring, because the existence of measured bearing moment of friction drives the rotation of measured bearing inner ring, stir torque sensor by driving lever again, characterize the voltage signal of measured bearing friction square by torque sensor output, be u (t)=kT (t), this voltage signal machine is as calculated handled and is indicated the moment of friction value of its measured bearing with the electrical representation value, and exports to computing machine with voltage indicating value form and do signal processing analysis and graphic presentation.
Described miniature bearing dynamic friction torque measuring instrument comprises spring bearing, main shaft, outer seat, driving lever, load bar, torque sensor, support, the damping lubricating cup, loaded line, load counterweight, load the damping lubricating cup, motor, electric cabinet, belt pulley, flexible clutch and computing machine, wherein the measured bearing outer ring is placed in the step of outer seat, the measured bearing inner ring penetrates load bar, the driving lever that has flexible material is inserted in the load bar upper end, driving lever is stirred the torque sensor that is fixed on the support, torque sensor is fixed on the support, is provided with the damping lubricating cup in the lower end of torque sensor; The lower end of outer seat is connected with the main shaft that together rotates, main shaft is fixed on the spring bearing support fixation on the measuring instrument, the lower end of main shaft is connected with belt pulley by flexible clutch, and belt pulley is by motor-driven, and motor is by electric cabinet and the computing machine interlock control that designs program; Be connected with loaded line on load bar, loaded line connects the loading counterweight again, loads counterweight and is suspended in the loading damping lubricating cup.
Because adopt aforesaid technical scheme, the present invention has following superiority:
1, the present invention is simple and compact for structure, need not external unit, and price can be controlled in 100,000 yuan, and operation is very reliable, convenient.
2, by adopting technological means such as two damping compensation systems, high precision axle system, closed loop driving control system, reduce disturbance torque effectively to produce error, improved precision and stability.
3, the present invention is through the verification experimental verification of 23,95 and 18 3 model bearings, and its precision and error are less than 5%, and the precision of the low speed dynamic friction torque instrument of domestic development and error mostly are greatly more than 10%, have application value widely.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Among Fig. 1: the 1-spring bearing; The 2-main shaft; The outer seat of 3-; The 4-measured bearing; The 5-driving lever; The 6-load bar; The 7-torque sensor; The 8-support; 9-damping lubricating cup; The 10-loaded line; 11-loads counterweight; 12-loads the damping lubricating cup; The 13-motor; The 14-electric cabinet; The 15-belt pulley; The 16-flexible clutch; The 17-computing machine.
Embodiment
The method for designing of miniature bearing dynamic friction torque measuring instrument of the present invention, the design concept of its measuring instrument adopts two damping compensation systems to reduce disturbance torque, promptly by loading counterweight tension loaded line measured bearing is loaded on the one hand, greatly reduce the moment of torsion effect of steel wire, under the loading counterweight, be provided with one simultaneously and load the damping lubricating cup to reduce the loading counterweight rotates generation with measured bearing feedback interference; On the other hand, a damping lubricating cup also is set, on the driving lever of torque sensor and measured bearing, puts flexible material simultaneously to reduce impact that brings when measured bearing is stirred torque sensor and the generation of avoiding hysteresis phenomenon at the torque sensor front end; Measured bearing is installed between outer seat and the load bar, by the loaded line on the load bar measured bearing inner ring is applied load, outer seat connection main shaft, by the motor closed-loop control, constant speed is rotated, main shaft drives outer seat and the rotation of measured bearing outer ring, because the existence of measured bearing moment of friction drives the rotation of measured bearing inner ring, stir torque sensor by driving lever again, characterize the voltage signal of measured bearing friction square by torque sensor output, be u (t)=kT (t), this voltage signal machine is as calculated handled and is indicated the moment of friction value of its measured bearing with the electrical representation value, and exports to computing machine with voltage indicating value form and do signal processing analysis and graphic presentation.
In conjunction with Fig. 1 and according to above-mentioned design concept, miniature bearing dynamic friction torque measuring instrument of the present invention comprises spring bearing 1, main shaft 2, outer seat 3, driving lever 5, load bar 6, torque sensor 7, support 8, damping lubricating cup 9, loaded line 10, load counterweight 11, load damping lubricating cup 12, motor 13, electric cabinet 14, belt pulley 15, flexible clutch 16 and computing machine 17, wherein measured bearing 4 outer rings are placed in the step of outer seat 3, measured bearing 4 inner rings penetrate load bar 6, the driving lever 5 that has flexible material is inserted in load bar 6 upper ends, driving lever 5 is stirred the torque sensor 7 that is fixed on the support 8, torque sensor 7 is fixed on the support 8, is provided with damping lubricating cup 9 in the lower end of torque sensor 7; The lower end of outer seat 3 is connected with the main shaft 2 that together rotates, main shaft 2 is fixed on spring bearing 1 support fixation on the measuring instrument, the lower end of main shaft 2 is connected to belt pulley 15 by flexible clutch connection 16, belt pulley 15 is driven by motor 13, and motor 13 is by electric cabinet 14 and the computing machine 17 interlock controls that design program; Be connected with loaded line 10 on load bar 6, loaded line 10 connects and loads counterweight 11, loads counterweight 11 and is suspended in and loads in the damping lubricating cup 12.
When motor 13 drives the rotation of drive shaft 2 constant speed, measured bearing 4 outer rings are along with outer seat 3 rotations, because the existence of measured bearing 4 internal frictions, measured bearing 4 outer rings drive steel ball, steel ball drives the rotation of measured bearing 4 inner rings again, driving lever 5 on the load bar 6 that is fixed on is stirred torque sensor 7, and by the voltage signal of torque sensor 7 output sign measured bearings 4 moment of frictions, voltage signal is presented on computing machine 17 screens with the form output of digital signal.

Claims (1)

1. the method for designing of a miniature bearing dynamic friction torque measuring instrument, this measuring instrument comprises spring bearing (1), main shaft (2), outer seat (3), driving lever (5), load bar (6), torque sensor (7), support (8), damping lubricating cup (9), loaded line (10), load counterweight (11), load damping lubricating cup (12), motor (13), electric cabinet (14), belt pulley (15), flexible clutch (16) and computing machine (17), wherein measured bearing (4) outer ring is placed in the step of outer seat (3), measured bearing (4) inner ring penetrates load bar (6), the driving lever (5) that has flexible material is inserted in load bar (6) upper end, driving lever (5) is stirred the torque sensor (7) that is fixed on the support (8), torque sensor (7) is fixed on the support (8), is provided with damping lubricating cup (9) in the lower end of torque sensor (7); The lower end of outer seat (3) is connected with the main shaft (2) that together rotates, main shaft (2) Bei Gu is Dinged spring bearing (1) support fixation on the Zai Measuring amount instrument, the lower end of main shaft (2) is connected to belt pulley (15) by flexible clutch connection (16), belt pulley (15) is driven by motor (13), and motor (13) is controlled by electric cabinet (14) and computing machine (17) interlock that designs program; Be connected with loaded line (10) on load bar (6), loaded line (10) connects loading counterweight (11) again, loads counterweight (11) and is suspended in the loading damping lubricating cup (12); The method for designing that it is characterized in that Gai Measuring amount instrument of: is to adopt two damping compensation systems to reduce disturbance torque, promptly by loading counterweight tension loaded line measured bearing is loaded on the one hand, greatly reduce the moment of torsion effect of steel wire, under the loading counterweight, be provided with one simultaneously and load the damping lubricating cup to reduce the loading counterweight rotates generation with measured bearing feedback interference; On the other hand, a damping lubricating cup also is set, on the driving lever of torque sensor and measured bearing, puts flexible material simultaneously to reduce impact that brings when measured bearing is stirred torque sensor and the generation of avoiding hysteresis phenomenon at the torque sensor front end; Measured bearing is installed between outer seat and the load bar, by the loaded line on the load bar measured bearing inner ring is applied load, outer seat connection main shaft, by the motor closed-loop control, constant speed is rotated, main shaft drives outer seat and the rotation of measured bearing outer ring, because the existence of measured bearing moment of friction drives the rotation of measured bearing inner ring, stir torque sensor by driving lever again, characterize the voltage signal of measured bearing friction square by torque sensor output, be u (t)=k.T (t), this voltage signal machine is as calculated handled and is indicated the moment of friction value of its measured bearing with the electrical representation value, and exports to computing machine with voltage indicating value form and do signal processing analysis and graphic presentation.
CN2008102307841A 2008-10-30 2008-10-30 Design method of miniature bearing dynamic friction moment measurement instrument Active CN101509814B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2008102307841A CN101509814B (en) 2008-10-30 2008-10-30 Design method of miniature bearing dynamic friction moment measurement instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2008102307841A CN101509814B (en) 2008-10-30 2008-10-30 Design method of miniature bearing dynamic friction moment measurement instrument

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CN101509814B true CN101509814B (en) 2010-09-22

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102322995B (en) * 2011-08-12 2012-11-28 洛阳轴研科技股份有限公司 Face-to-face pairing miniature ball bearing friction torque test method under application axial direction load
CN102778313A (en) * 2012-06-02 2012-11-14 上海大学 Device for testing dynamic friction torque of precise micro rolling bearing
CN106353084B (en) * 2016-10-12 2019-02-01 燕山大学 Joint precision bearing system rigidity and moment of friction performance degradation experimental rig
CN107300469B (en) * 2017-08-01 2019-06-25 人本集团有限公司 Tapered roller bearing dynamic friction torque feature measurement machine
CN112857645A (en) * 2021-01-11 2021-05-28 宁波大学 Micro ball bearing friction torque testing device
CN113848062A (en) * 2021-12-01 2021-12-28 三迪(常州)智能装备有限公司 Oilless bearing friction force detection equipment

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Effective date of registration: 20180509

Address after: 471000 No. 1 axis research road, Jianxi science and Technology Industrial Park, Luoyang, Henan

Patentee after: Luoyang Bearing Research Institute

Address before: 471039 Fenghua Road 6, hi tech Development Zone, Luoyang, Henan.

Patentee before: Zhouyan Science and Technology Co., Ltd., Luoyang