Bearing clearance selection method for adjusting radial supporting rigidity of rolling bearing
A technology for rolling bearings and support stiffness, applied in the direction of instruments, geometric CAD, electrical digital data processing, etc., can solve problems such as the difficulty of dynamic laws, achieve the effects of overcoming adverse effects, reducing workload, and improving accuracy
Pending Publication Date: 2021-07-09
NANJING UNIV OF SCI & TECH
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Problems solved by technology
Since ball bearings contain many nonlinear factors such as Hertz contact, bearing clearance and time-varying compliance parameters, it is extremely difficult to clarify the dynamics of the nonlinear characteristics of rolling bearing support stiffness and the influence of bearing clearance parameters
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Embodiment
[0085]In order to verify the effectiveness of the method of the present invention, the following simulation is carried out. The specific parameters of a given type of JIS6306 ball bearing are shown in Table 1.
[0086] Table 1 JIS6306 ball bearing system parameters
[0087]
[0088] For such as figure 1 The shown two-degree-of-freedom ball bearing variable-flexibility vibration dynamics model uses the harmonic balance-frequency / time conversion method to quickly obtain the amplitude-frequency response curve of the main resonance of the system variable-flexibility vibration as the bearing radial working clearance δ 0 transformation rules, see Figure 2 to Figure 5 . When δ 0 =6μm, such as figure 2 The shown x-direction system bearing support stiffness has soft spring support characteristics, while the y-direction bearing support stiffness has soft and hard spring support characteristics. Taking the adjustment of the bearing support stiffness characteristics in the x di...
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The invention discloses a bearing clearance selection method for adjusting the radial supporting rigidity of a rolling bearing. The method comprises the steps of obtaining the geometric dimension, the ball number, the contact rigidity and the equivalent damping of the rolling bearing; establishing a radial variable flexibility vibration dynamic model of the rolling bearing system; using a harmonic balance-frequency / time conversion method to solve the radial variable-flexibility vibration dynamic model of the rolling bearing system, obtaining a variable-flexibility vibration main common-amplitude frequency response curve, and judging the main resonance position of the system; according to the geometrical characteristics of the variable flexibility vibration main common amplitude frequency response curve, judging the bearing rigidity characteristics of the rolling bearing at the present stage; determining ideal supporting rigidity characteristics of the rolling bearing by combining actual working condition requirements of a rolling bearing system; according to the bearing rigidity characteristics of the rolling bearing at the present stage, increasing or decreasing the radial working clearance of the bearing, and realizing the required ideal bearing rigidity of the rolling bearing. According to the invention, the workload of judging the bearing rigidity characteristics is reduced, and the precision of adjusting the bearing rigidity characteristics is improved.
Description
technical field [0001] The invention relates to the field of dynamic optimization design of rolling bearings, in particular to a method for selecting bearing clearance for adjusting radial support stiffness of rolling bearings. Background technique [0002] The impact of a healthy bearing on the vibration characteristics of its support system is mainly reflected in two aspects: elastic support and VC time-varying excitation (Harris, 2001; Luo Jiwei, Luo Tianyu, 2009). It is traditionally believed that due to the Hertz contact static deformation relationship between rolling elements and raceways of rolling bearings (where Hertz point contact is nonlinear to the power of 3 / 2, and Hertz line contact is nonlinear to the power of 10 / 9), the stiffness of rolling bearings Has a hard spring bearing characteristic (Erwin, 2001). In recent years, researchers at home and abroad have successively discovered that the dynamic support stiffness of rolling bearing systems may also include ...
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IPC IPC(8): G06F30/17G06F119/14
CPCG06F30/17G06F2119/14
Inventor 张智勇应永恒
Owner NANJING UNIV OF SCI & TECH