Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of end tooth structure fretting fatigue test device and test method

A technology of fretting fatigue and test equipment, which is applied in the testing of machine gears/transmission mechanisms, testing the strength of materials by applying repetitive force/pulsation force, and testing the strength of materials by applying stable tension/pressure, which can solve the problems of fatigue life decline, Problems such as the small driving force of the thread loading scheme and the change of the loading normal force can achieve the effect of reducing the test cost, saving the cost of the test piece, and increasing the driving force.

Active Publication Date: 2017-01-04
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The end-tooth structure is widely used in aeromechanical turbine engine transmission spindles and transmission devices of various high-speed, large-scale and heavy-duty mechanical equipment. It has the advantages of fewer transmission teeth, compact structure, and high load-bearing capacity. In the middle, the fretting fatigue between the mating contact surfaces of the concave and convex teeth will lead to a significant decrease in the fatigue life
However, it is difficult to conduct fretting fatigue test research on three-dimensional structural parts of end teeth, mainly because of two technical problems: (1) the end tooth structure needs to be processed by a special gear grinding machine, and the processing cost of three-dimensional structural parts is too high; (2) For the fatigue test of three-dimensional structural parts, it is necessary to consider the actual stress of the end tooth structure, mainly including axial preload, torque and centrifugal force. If it is necessary to completely simulate the stress of its real three-dimensional structure, a rotation test is required In the non-rotating test, when considering the preload and torque alone, it is also necessary to use a multi-axis fatigue testing machine to achieve
[0006] The existing loading device for fretting fatigue test with uniaxial fatigue testing machine mostly adopts the loading ring structure and loads through bolts, but the driving force of the thread loading scheme is small, and various factors such as vibration during the fatigue process are likely to cause the thread The connection is loose, causing a change in the loading normal force

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of end tooth structure fretting fatigue test device and test method
  • A kind of end tooth structure fretting fatigue test device and test method
  • A kind of end tooth structure fretting fatigue test device and test method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0045] Please refer to Figure 1 to Figure 7 As shown, the end tooth structure fretting fatigue test device of the present invention includes a concave tooth fixing assembly 1 , a convex tooth clamping assembly 2 and a normal force loading assembly 3 .

[0046] The concave tooth fixing assembly 1 includes an upper clamp body 12 and a concave tooth test piece 11 installed on the upper clamp body 12, an M10 compression bolt 13 and a concave tooth pressure plate 14, wherein the upper clamp body 12 includes a hollow lower part 120 and a lower part. The upper part 121 above 120, wherein the upper end of the upper part 121 can be clamped on the upper chuck 43 of a common uniaxial fatigue testing machine, and is integrated with the upper crossbeam 41 of the testing machine, and can be raised and lowered in the vertical direction thereupon. The lower part 120 is formed with a rectangular hole 122 penetrating through the front, rear and lower surfaces of the lower part 120 . A rectang...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an end tooth structure fretting fatigue test device and a test method, wherein the test device includes a concave tooth fixing component, a convex tooth clamping component and a normal force loading component, and the concave tooth fixing component realizes the fixing of the concave tooth test piece. The convex tooth clamping assembly realizes the loading of the convex tooth test piece, and the normal force loading assembly realizes the application of horizontal load. The horizontal loading device of the fretting fatigue test adopts a symmetrical structure layout, and the load is realized by a hydraulic loading system. The hydraulic loading system adopts a closed force It is a frame structure with no external force output, which does not affect the vertical loading of the fatigue testing machine. The concave tooth test piece is subjected to preload in the horizontal direction, and the vertical direction is pressed by the concave tooth pressure plate to ensure that the horizontal The direction of loading remains unchanged. The present invention can approximately simulate the force condition of the end teeth in the actual working environment, cooperate with the ordinary single-axis fatigue testing machine, and can carry out the fretting fatigue test of the end tooth structure simulation parts, and reduce the experiment cost.

Description

[0001] Technical field: [0002] The invention relates to an end tooth structure fretting fatigue test device and a test method, which belong to the technical field of life evaluation tests of materials and structural parts. [0003] Background technique: [0004] The end-tooth structure is widely used in aeromechanical turbine engine transmission spindles and transmission devices of various high-speed, large-scale and heavy-duty mechanical equipment. It has the advantages of fewer transmission teeth, compact structure, and high load-bearing capacity. Among them, the fretting fatigue between the mating contact surfaces of the concave and convex teeth will lead to a significant decrease in fatigue life. However, it is difficult to conduct fretting fatigue test research on three-dimensional structural parts of end teeth, mainly because of two technical problems: (1) the end tooth structure needs to be processed by a special gear grinding machine, and the processing cost of three-...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/36G01N3/10G01M13/02
Inventor 李爱民崔海涛李奇璇
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com