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Shaping method for Archimedes curved surface wedge block of sprag clutch

A technology of clutches and wedges, applied in clutches, one-way clutches, instruments, etc., can solve the problem of reducing the load capacity of clutches

Active Publication Date: 2016-07-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the wedge angle V of the wedge profile of the Archimedes sprag clutch gradually decreases during the wedge loading process, the carrying capacity of the clutch during normal transmission is reduced.

Method used

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  • Shaping method for Archimedes curved surface wedge block of sprag clutch
  • Shaping method for Archimedes curved surface wedge block of sprag clutch
  • Shaping method for Archimedes curved surface wedge block of sprag clutch

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Experimental program
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Effect test

Embodiment Construction

[0046] The present invention will be described in detail below through specific examples.

[0047] see figure 1 , The sprag type overrunning clutch is composed of sprag 4, inner ring 5, outer ring 1, cage 2 and spring 3.

[0048] see figure 2 and image 3 , the modification method of the archimedes curved surface wedge of the sprag clutch provided by the present invention, the cam modification curve under the wedge is established as: ρ=ρ0+aθ+μθ 2 , where ρ0 is the initial polar diameter, θ is the polar angle, a is the coefficient, and μ is the modification coefficient.

[0049] Determining the modification curve includes: obtaining the working torque according to the power and speed of the clutch; according to the working torque and referring to the three-arc surface clutch to obtain the number of sprags n and the radius R of the inner ring i , outer ring radius R o , wedge effective length and other structural parameters; according to the structural size parameters of...

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Abstract

The invention discloses a shaping method for an Archimedes curved surface wedge block of a sprag clutch. The shaping method comprises the steps that a shaping characteristic curve is determined according to an Archimedes curve of a lower cam of the wedge block; a shaping coefficient is determined according to the ultimate torque and the ultimate wedge block inner wedge angle; and a mechanical model of a shaping clutch is determined according to the Hertz theory and the thick-walled cylinder theory. According to the step that the shaping characteristic curve is determined according to the Archimedes curve of the lower cam of the wedge block, the shaping characteristic curve equation is rho=rho0+a theta+mu theta <2>, wherein rho0 is the initial polar radius, theta is the polar angle, a is a coefficient, and mu is the shaping coefficient. By the adoption of the design method, the good impact resistance of the Archimedes curve is maintained, the wedge block inner wedge angle V of the sprag clutch is made to increase gradually in the wedging process, and the bearing capacity of the sprag clutch is improved.

Description

technical field [0001] The invention relates to a method for modifying wedges, in particular to a method for modifying archimedes curved surface wedges of a brace clutch with improved bearing capacity. Background technique [0002] In the helicopter transmission system, the sprag clutch is one of the key components for the engine to work together and transmit the active torque and motion. Its function is to realize the clutch between the engine and the final reducer. The sprag type overrunning clutch is composed of sprag 4, inner ring 5, outer ring 1, cage 2 and spring 3, such as figure 1 shown. [0003] The working type of the clutch wedge is very important to the clutch performance of the clutch. Some scholars have studied the surface structure and parameters of different diagonal braces, and proposed a cam under the wedge as the Archimedes spiral curve (ρ =ρ0+aθ), research shows that the maximum wedging impact force between the wedges of the Archimedes sprag clutch and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16D41/063G06F17/50
CPCF16D41/063F16D2041/0603G06F30/17
Inventor 严宏志赵聪赵鹏王祎维张诗颖张美玉姚毅
Owner CENT SOUTH UNIV
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