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A bearing type selection method for reducing bearing failure rate of bearing gear transmission system

A transmission system, bearing gear technology, applied in the direction of geometric CAD, special data processing applications, etc., can solve problems affecting the reliability and safety of mechanical equipment

Active Publication Date: 2020-01-17
TANGZHI SCI & TECH HUNAN DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, after the replacement, the same failure mode occurs quickly, seriously affecting the reliability and safety of mechanical equipment

Method used

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  • A bearing type selection method for reducing bearing failure rate of bearing gear transmission system
  • A bearing type selection method for reducing bearing failure rate of bearing gear transmission system
  • A bearing type selection method for reducing bearing failure rate of bearing gear transmission system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Embodiment 1, internal and external cause analysis of motor bearing inner ring faults frequently occurring in a certain 3C type car but rarely in a certain type 2 car and proof of the inventiveness of the present invention

[0062] The failure of two cracks in the inner ring of the motor bearing across two rollers occurs frequently in a certain type 3C vehicle, but rarely occurs in a certain type 2 vehicle.

[0063] The transmission gears of the two vehicles have exactly the same number of teeth: the large gear has 101 teeth, and the small gear has 21 teeth;

[0064] But the bearings used are different:

[0065] 3C type car bearing parameters: D0=238mm, d=45mm, Z=13;

[0066] Type 2 bearing parameters: D0=177mm, d=34mm, Z=14;

[0067] Cloud statistics for big data are as follows:

[0068] The time period of big data cloud statistics is: from August 6, 2012 to April 29, 2015, the obtained 1287 3C vehicles, 672 2 vehicles, and the number of bearing failure alarms at th...

Embodiment 2

[0104] Embodiment 2, the internal cause analysis of the inner rings of several early-stage locomotive motor bearings that almost do not cross two rollers, and the corresponding comparison with the new locomotive, proves the inventiveness of the present invention.

[0105] Some early locomotives made in China have hardly found two cracks in the inner ring of the motor gear end bearing of the above-mentioned 3C type car in the past 10 years when the distance between the two rollers is the distance between the two rollers. Is this related to the fact that the number of rollers Lcnei supporting the length of the bearing area of ​​the inner ring is greater than 1 under the dynamic operating conditions of the gear end bearings of these motors, that is, the probability that there are more than 2 rollers that can be contacted in the bearing area is guaranteed? It is identified through big data cloud statistics.

[0106] Table 3 Lcnei value big data cloud statistics of early locomotive...

Embodiment 3

[0125] Example 3, cloud investigation of inner ring faults in gear end bearings of HXD3CA car motors that do not meet Lcnei>1

[0126] The data in Table 4 shows that: Lcnei=0.9661 of the gear end bearing of the HXD3CA locomotive motor is less than the safety limit value not less than 1 stipulated by theory, so it is reasonable to think that the bearing will have frequent failures, and it is the inner ring failure form of the bearing.

[0127] attached Figure 7 It is the cloud statistics of the alarm situation of HXD3CA locomotive from August 2012 to October 2016. The cloud statistical results of the 2-bit (ie motor gear end) failure rate of all 158 vehicles show that there are a total of 10 early warnings and 12 first-level alarms, mainly concentrated on locomotive HXD3CA-7505. The alarm rate is 22 / 158=13.92%.

[0128] attached Figure 8 It is one of the records of the HXD3CA-7505-2 bit implementation detection data and vehicle alarm, specifically the record of the last le...

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Abstract

The invention discloses a bearing type selection method for reducing the bearing fault rate of a bearing gear transmission system. A bearing is selected specifically according to the principle that 'when the bearing region length ratio of an inner ring rolling working surface is equal to that a bearing region of C turns around an outer ring bearing region, the number of rollers Lcnei for dynamically supporting the length of an inner ring bearing region is greater than 1, namely the possibility that the number of rollers is greater than or equal to 2 within the length of the inner ring bearing region during operation' and the principle that 'the intensive fatigue possibility of an inner ring of the bearing is less than or equal to 50 percent when the bearing is matched with a transmission gear', so that the fault rate of the bearing can be substantially reduced, the safety and the reliability of a machine are effectively improved, and the service life of the bearing is effectively prolonged.

Description

technical field [0001] The invention belongs to the technical field of reliability design of rail transit and other bearings and gear transmission systems, and in particular relates to a bearing type selection method for reducing the failure rate of bearings in a bearing gear transmission system. Background technique [0002] In mechanical equipment, if the number of rollers in a bearing is small, especially in a transmission system composed of bearings and gears, the failure rate of the bearing will increase significantly. [0003] The inventor proposed "fixed-point fatigue theory" (Chinese patent "A Bearing and Gear Matching Design Method to Reduce the Failure Rate of Gear Transmission System", ZL20080043838.3; "A Fixed-point Fatigue Identification Method for Diagnosing Bearing and Gear Faults in Transmission System" , 201210138145.9), the selection of bearings for each component of the transmission system was carried out in isolation, that is, the matching relationship wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/17
CPCG06F30/17
Inventor 唐德尧李修文
Owner TANGZHI SCI & TECH HUNAN DEV CO LTD