Nut with thread evenly loaded
A nut and thread technology, applied in the field of mechanical design and processing, can solve the problems of accelerated thread fatigue damage, uneven thread stiffness, uneven load distribution, etc., to improve fatigue life, uniform overall force, and improve contact stress The effect of uneven distribution
Active Publication Date: 2016-08-10
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology
The yield limit of the nut material is lower than that of the screw material, resulting in uneven thread stiffness and uneven load distribution when the thread pair contacts, thereby accelerating the fatigue damage of the thread
Method used
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Embodiment Construction
[0027] Taking the small-sized rolling mill that bears the axial heavy load as an example, the pressure test is carried out respectively to the ordinary nut and the thread load-sharing nut of the present invention, and the threaded connection form is the same as image 3 The same as shown, the material and structural size of the nut are shown in Table 1 and Table 2, the axial load P is used as the rolling force, the screw 1 is used as the screw for the rolling mill, and the nut is used as the nut for the rolling mill. Apply a rolling force of 100T on the depressed screw, and test the screw thread root contact stress of the screw thread load-sharing nut of the present invention and the common nut respectively by experiments, such as Figure 4 Shown are the load distribution characteristics of two nuts.
[0028] Table 1. Material properties of the screw thread pair used in the test
[0029]
Material
Poisson's ratio
Yield Strength
P...
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The invention discloses a nut with a thread evenly loaded and belongs to the field of mechanical design. The nut is applied to the condition that axial force and thrust force of a thread pair are located on the different sides of the nut, and the nut bears pressure in two directions. The nut with the thread evenly loaded is characterized in that according to the structure of the nut, under the condition that the height of the thread is maintained unchanged, a nut base body at the thrust end of the nut is heightened, inner chamfers theta 1 are formed on the inner sides of the heightened part of the nut base body, and the height of the chamfers is the same as that of the heightened part; meanwhile, outer chamfers theta 2 are formed on the outer side of the loading end of the nut; and the ratio of the height of the nut to the diameter of the outermost circle of the nut base body is 0.6-1.5, the nut bears pressure in the two directions, the pitch of the nut is set h, the height of the inner chamfers is the increased height of the nut base body and is (1-4) h, the height of the outer chamfers is (2-7) h, the angle of the inner chamfers theta 1 ranges from 5 degrees to 60 degrees, and the angle of the outer chamfers theta 2 ranges from 20 degrees to 50 degrees. The nut with the thread evenly loaded has the beneficial effects that the phenomenon that loading of the thread pair is not even is improved, a thread face of the nut evenly bears pressure, and the fatigue life of the nut is prolonged.
Description
technical field [0001] The invention belongs to the field of mechanical design and processing, and in particular relates to a screw tooth equal load nut. Background technique [0002] Threaded pair mechanisms that bear axial heavy loads are widely used in heavy machinery, and most of them work in cyclic heavy load environments. During the working process, due to the different rigidity and deformation modes of the nut and the screw, there are common problems such as uneven bearing between the thread teeth and large stress concentration at the root of the thread teeth, resulting in uneven force on the thread meshing parts, cracks, and even continuous cracks. Expansion leads to instability and fracture, shortening the service life of the thread pair. For heavy machinery, two different materials are usually used to manufacture nuts and screws respectively, considering the different stress and failure modes of thread pairs subjected to axial load. Nuts generally require wear re...
Claims
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IPC IPC(8): F16B37/00
CPCF16B37/00
Inventor 赵春江张飞涛周研江连运熊杰刘奔奔刘永锋高新
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY