CN115034109A - Fitting tolerance determination method and device, electronic equipment and storage medium - Google Patents
Fitting tolerance determination method and device, electronic equipment and storage medium Download PDFInfo
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- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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Abstract
The invention discloses a fit tolerance determining method and device, electronic equipment and a storage medium. The method comprises the following steps: constructing a finite element model based on the transmission input shaft, the motor output shaft, the first bearing, the second bearing and the third bearing, and carrying out meshing on contact parts among the transmission input shaft, the motor output shaft, the first bearing, the second bearing and the third bearing to obtain at least one refined mesh to be used; applying different acting forces to the finite element model, and determining radial deformation quantities of the to-be-used refined grids corresponding to the transmission input shaft and the motor output shaft under the different acting forces; determining a target deformation amount based on each radial deformation amount; based on the target amount of deformation, a fit tolerance between the transmission input shaft and the motor output shaft is determined. The problem of among the prior art confirm three bearing structure inter-axle fit tolerance based on manual experience, lead to fit tolerance to confirm that the accuracy is low is solved, realize improving the effect of fit tolerance calculation accuracy.
Description
Technical Field
The present invention relates to the field of computer processing technologies, and in particular, to a method and an apparatus for determining a fit tolerance, an electronic device, and a storage medium.
Background
The three-bearing motor transmission is a transmission with a three-bearing structure assembly, and in the design process of a three-bearing motor transmission product, in order to optimize the performance of the three-bearing motor transmission, an optimum inter-shaft fit tolerance is generally defined for the three-bearing motor transmission, so that a motor output shaft and a transmission input shaft are matched based on the fit tolerance.
In the method for determining the fit tolerance between the shafts in the prior art, the fit tolerance is determined usually based on personal experience of engineers, and then the performance of the three-bearing motor transmission formed based on the fit tolerance is checked by a simulation test technical means.
Disclosure of Invention
The invention provides a method and a device for determining fit tolerance, electronic equipment and a storage medium, which are used for achieving the technical effects of improving the test precision and efficiency while improving the accuracy of determining the fit tolerance between shafts.
According to an aspect of the present invention, there is provided a fitting tolerance determining method including:
constructing a finite element model based on a transmission input shaft, a motor output shaft, a first bearing, a second bearing and a third bearing, and performing meshing on contact parts among the transmission input shaft, the motor output shaft, the first bearing, the second bearing and the third bearing to obtain at least one refined mesh to be used;
applying different acting forces to the finite element model, and determining radial deformation quantities of the to-be-used refined grids corresponding to the transmission input shaft and the motor output shaft under different acting forces; wherein the direction of the radial deformation is perpendicular to the respective shaft bottom surface;
determining a target deformation amount based on each radial deformation amount;
based on the target amount of deformation, a fit tolerance between the transmission input shaft and the motor output shaft is determined.
According to another aspect of the present invention, there is provided a fitting tolerance determining apparatus including:
the to-be-used refined grid determining module is used for constructing a finite element model based on a transmission input shaft, a motor output shaft, a first bearing, a second bearing and a third bearing, and performing grid division on contact parts among the transmission input shaft, the motor output shaft, the first bearing, the second bearing and the third bearing to obtain at least one to-be-used refined grid;
the radial deformation quantity determining module is used for applying different acting forces to the finite element model and determining the radial deformation quantities of the to-be-used refined grids corresponding to the transmission input shaft and the motor output shaft under different acting forces; wherein the direction of the radial deformation is perpendicular to the respective shaft bottom surface;
the target deformation quantity determining module is used for determining a target deformation quantity based on each radial deformation quantity;
a fit tolerance determination module to determine a fit tolerance between the transmission input shaft and the motor output shaft based on the target amount of deformation.
According to another aspect of the present invention, there is provided an electronic apparatus including:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein, the first and the second end of the pipe are connected with each other,
the memory stores a computer program executable by the at least one processor, the computer program being executable by the at least one processor to enable the at least one processor to perform the fit tolerance determination method according to any of the embodiments of the present invention.
According to another aspect of the present invention, there is provided a computer-readable storage medium storing computer instructions for causing a processor to implement a fit tolerance determination method according to any one of the embodiments of the present invention when executed.
According to the technical scheme of the embodiment of the invention, at least one to-be-used refined grid is obtained by carrying out grid division on contact parts among a transmission input shaft, a motor output shaft, a first bearing, a second bearing and a third bearing in a finite element model, different acting forces are applied to the finite element model, radial deformation quantities of the to-be-used refined grids corresponding to the transmission input shaft and the motor output shaft under different acting forces are determined, a target deformation quantity is determined based on the radial deformation quantities, and then a matching tolerance between the transmission input shaft and the motor output shaft is determined based on the target deformation quantity, so that the problem of low accuracy of determining the matching tolerance due to the fact that the matching tolerance between shafts of three bearing structures is determined based on manual experience in the prior art is solved, and the radial deformation quantities corresponding to the transmission input shaft and the motor output shaft under different acting forces are determined when different acting forces are applied to the finite element model, the method combines different test working conditions, determines the target deformation quantity based on the radial deformation quantity under each test working condition, determines the fit tolerance between the shafts of the three-bearing structure based on the target deformation quantity, and achieves the technical effects of improving the test precision and efficiency while improving the accuracy of the determination of the fit tolerance between the shafts.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a fitting tolerance determining method according to an embodiment of the present invention;
FIG. 2 is a schematic view of a three-bearing structure provided in accordance with an embodiment of the present invention;
FIG. 3 is a schematic illustration of a spline location grid provided in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram of a motor output shaft spline shaft symmetry provided in accordance with an embodiment of the present invention;
FIG. 5 is a schematic illustration of a single spline tooth flank mesh zone refinement provided in accordance with an embodiment of the present invention;
FIG. 6 is a schematic view of a bearing geometry provided in accordance with an embodiment of the present invention;
FIG. 7 is a schematic view of a bearing cup geometry provided in accordance with an embodiment of the present invention;
FIG. 8 is a schematic view of a bearing outer surface creation RBE3 cell provided in accordance with one embodiment of the present invention;
FIG. 9 is a schematic view of a motor output shaft geometry provided in accordance with an embodiment of the present invention;
FIG. 10 is a schematic view of a motor shaft outer surface creation RBE3 unit provided in accordance with one embodiment of the present invention;
FIG. 11 is a diagrammatic illustration of a transmission input shaft plane provided in accordance with an embodiment of the present invention;
FIG. 12 is a schematic illustration of a transmission input shaft gear mesh point establishing RBE3 unit provided in accordance with an embodiment of the present invention;
FIG. 13 is a schematic view of a planer surface of an output shaft of a motor provided in accordance with an embodiment of the present invention;
fig. 14 is a schematic structural view of a fitting tolerance determining apparatus according to a third embodiment of the present invention;
fig. 15 is a schematic structural diagram of an electronic device that implements the fitting tolerance determining method of the embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," "target," and "original" and the like in the description and the claims of the invention and the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example one
Fig. 1 is a flowchart of a fitting tolerance determining method provided in an embodiment of the present invention, and this embodiment is applicable to a case of determining a fitting tolerance between shafts, and the method may be executed by a fitting tolerance determining apparatus, which may be implemented in a form of hardware and/or software, and the fitting tolerance determining apparatus may be configured in a computing device. As shown in fig. 1, the method includes:
s110, constructing a finite element model based on a transmission input shaft, a motor output shaft, a first bearing, a second bearing and a third bearing, and carrying out meshing on contact parts among the transmission input shaft, the motor output shaft, the first bearing, the second bearing and the third bearing to obtain at least one refined mesh to be used.
In practical applications, a finite element model of a three-bearing structure assembly may be established, for example, the three-bearing structure includes a transmission input shaft, a motor output shaft, a first bearing, a second bearing, a third bearing, and the like, and referring to fig. 2, fig. 2 may be represented as a three-bearing structure diagram, and the transmission input shaft 220, the motor output shaft 250, the first bearing 220, the second bearing 230, and the third bearing 240 may together form a three-bearing structure. All components in the three-bearing structure can be subjected to meshing, and the divided meshes are assembled together to construct a finite element model. When the meshes are divided, the contact parts among the transmission input shaft, the motor output shaft, the first bearing, the second bearing and the third bearing can be subjected to refined meshes to obtain at least one refined mesh to be used, the rest part of the structure can be subjected to coarse meshes to obtain at least one coarsened mesh, and the refined mesh to be used is smaller than the coarsened mesh in volume. For example, the transmission input shaft and the motor output shaft are contacted by means of splines, which can be referred to fig. 3, fig. 3 can be represented as a spline position grid schematic diagram, a motor output shaft spline 2501 and a transmission input shaft spline 2101 tooth surface grid can be divided into grids in a partitioning manner, the middle coarsened two ends of a spline tooth surface are refined, and a spline tooth surface refined grid and a spline tooth surface coarsened grid are formed. In the actual modeling process, as shown in fig. 4, it can be represented as a schematic diagram of symmetry of a spline of a motor shaft, then both a spline 2501 of a motor output shaft and a spline 2101 of a transmission input shaft can be modeled by using axisymmetric modeling based on the symmetric characteristics of the spline, for example, only a single spline tooth surface mesh is built, referring to fig. 5, a spline tooth surface in the spline 2501 of the motor output shaft can be divided into a spline tooth surface refined mesh 25011 (i.e., a refined mesh to be used) and a spline tooth surface coarsened mesh 25012, and then a complete spline mesh model can be built by using axisymmetric modeling. Accordingly, a complete finite element model of the three bearing structure assembly can be obtained.
It should be noted that, in order to improve the accuracy of constructing the finite element model of the three-bearing structure, mechanical property parameters, such as material properties or strain, deformation gradient, etc., may be added to the finite element model, so that the actual mechanical properties of the corresponding component are represented based on the mechanical property parameters corresponding to each mesh.
Optionally, the method further includes: determining mechanical property data corresponding to the finite element model; the finite element model is updated based on the mechanical property data.
Wherein the mechanical property data comprises material property data and structural property data.
In practical applications, corresponding mechanical property data may be defined for the finite element model, for example, the elastic modulus of the finite element model is defined as 210000MPa, and the poisson ratio μ is defined as 0.3, all the finite element models are mechanical property data such as linear elastic material, and the finite element model may be updated based on the defined mechanical property data to obtain the finite element model with mechanical properties.
It should be noted that, in order to prevent rigid body displacement of the model and better satisfy the conditions for finite element solution, constraint conditions may be defined for the finite element model when the finite element model is built, for example, rotation of some components in the three-bearing structure may be limited when a load is applied to the finite element model.
Optionally, the method further includes: determining a first model boundary condition and a second model boundary condition corresponding to the finite element model; the finite element model is updated based on the first model boundary condition and the second model boundary condition.
Wherein the first model boundary condition is determined based on fixing the first bearing, the second bearing and the third bearing, e.g. fixing all degrees of freedom of the bearings except axial rotational degrees of freedom. The second model boundary condition is determined based on a fixed motor output shaft, e.g., a fixed motor output shaft axial rotational degree of freedom.
In practical applications, boundary constraints may be applied to the finite element model, and the boundary constraints may be divided into two types, one type is a first model boundary condition, and the other type is a second model boundary condition. For example, when the first model boundary condition is applied, i.e., the fixed bearing has all degrees of freedom except the axial rotational degree of freedom, the outer rings of the first bearing, the second bearing and the third bearing can be fixed to simulate the supporting effect of the transmission and the motor housing on the bearings. Taking the first bearing as an example to explain the fixing process of the bearing outer ring, as shown in fig. 6, it can be represented as a schematic bearing geometry, when fixing the bearing outer ring 2201, it needs to be applied by means of RBE3 unit, as shown in fig. 7, it can be represented as a schematic bearing outer ring geometry, main point 2202 of RBE3 unit selects the outer ring surface of the bearing outer ring 2201, and selects the bearing geometric center from point 2203, as shown in fig. 8, it can be represented as a schematic bearing outer surface to establish RBE3 unit, the degree of freedom of the RBE3 unit 2202 from point 2203 around 6 o' clock direction of cylindrical coordinate system 2204 is unconstrained, and the other degrees of freedom are fully constrained, Z axis of cylindrical coordinate system 2204 is along the gear shaft axis direction, R axis is along the radial direction of the gear shaft, and t axis is determined by Z, R according to the right-hand criterion. When the second model boundary condition is applied, namely the axial rotation freedom of the motor output shaft is fixed, for example, referring to fig. 9, fig. 9 can be represented as a geometric schematic diagram of the motor output shaft, when the motor output shaft 250 is fixed, the axial rotation freedom of the motor output shaft needs to be applied by means of RBE3 units, referring to fig. 10, a schematic diagram of RBE3 units can be established for the outer surface of the motor shaft, a main point 2502 of an RBE3 unit 2504 selects the outer surface of the motor output shaft 250, a secondary point 2505 selects the geometric center of the motor output shaft 250, and only the 6 o' clock direction freedom of the secondary point 2505 of the RBE3 unit 2504 around a cylindrical coordinate system 2503 is restrained. In the process of finite element model stress analysis, all degrees of freedom of the fixed bearing except the axial rotational degree of freedom and the axial rotational degree of freedom of the fixed motor output shaft are used for improving the precision of model analysis.
And S120, applying different acting forces to the finite element model, and determining radial deformation quantities of the to-be-used refined grids corresponding to the transmission input shaft and the motor output shaft under different acting forces.
Wherein, the acting force can be understood as load, and optionally, the acting force comprises bearing interference force, transmission gear meshing force and motor eccentric load, and the transmission gear meshing force is determined based on the gear pitch circle diameter of the transmission input shaft, gear transmission torque, a gear normal pressure angle and a helix angle at the gear pitch circle. Bearing interference forces may be understood as interference forces between contact areas of the transmission input shaft, the motor output shaft, the first bearing, the second bearing, and the third bearing. The motor eccentric load can be understood as radial electromagnetic force. The direction of the radial deformation is perpendicular to the respective shaft bottom surface.
In practical application, at least one acting force of bearing interference force, transmission gear meshing force and motor eccentric load can be applied to the finite element model, so that each grid in the finite element model can generate corresponding deformation, and radial deformation quantities of the to-be-used refined grids at the transmission input shaft and the motor output shaft under different acting forces can be obtained, so that the fit tolerance between the transmission input shaft and the motor output shaft can be determined based on the radial deformation quantities.
It should be noted that, in order to improve the accuracy of the fit tolerance calculation, different test conditions may be designed, different acting forces are applied under different test conditions, and accordingly, the radial deformation amount of each to-be-used refined grid under different test conditions may be obtained, for example, the radial deformation amount may be three test conditions, which may be: a pre-tightening working condition, a gear force working condition and an eccentric force working condition. The boundary conditions used by the three test conditions are all the first model boundary condition and the second model boundary condition. When the pre-tightening working condition test is executed, the interference magnitude of the inner ring of the bearing, namely the interference force of the bearing, can be loaded, and the meshing force of the transmission gear and the eccentric load of the motor are not applied. When the gear force working condition test is executed, the meshing force of the gears of the transmission can be applied on the basis of the pre-tightening working condition. When the eccentric force working condition test is executed, the eccentric load of the motor can be applied on the basis of the pre-tightening working condition. The following describes in detail the implementation of the three test conditions:
when the pre-tightening working condition test is executed, optionally, different acting forces are applied to the finite element model, and the radial deformation quantity of each to-be-used refined grid corresponding to the transmission input shaft and the motor output shaft under different acting forces is determined, wherein the radial deformation quantity comprises the following steps: and applying bearing interference force to the second bearing in the finite element model to obtain the radial deformation quantity of each to-be-used refined grid corresponding to the shaft inner wall of the transmission input shaft at the position of the second bearing.
It should be noted that, in consideration of calculation accuracy and calculation convergence of the interference contact between the shafts, when the contact areas of the transmission input shaft, the motor output shaft, the first bearing, the second bearing and the third bearing are cut, a regular geometric area is formed, and a corresponding interference contact relationship can be established at a contact part grid, that is, a corresponding bearing interference force is set.
In practical application, in order to improve the calculation efficiency, bearing interference force can be applied to the second bearing in the finite element model, and further calculation and analysis of the finite element model can be performed on the three-bearing structure, the time period of each test working condition can be set to be 1, the time increment can be set to be 0.1, and the Newton-Laplacian method is adopted to perform iterative calculation to output the analysis result of the three-bearing finite element model in the pre-tightening working condition test. Further, the analysis result may be processed to extract the radial deformation amount of each refinement grid to be used on the inner shaft wall (i.e., the inner shaft surface) of the transmission input shaft at the position corresponding to the second bearing position, for example, referring to fig. 11, fig. 11 may be represented as a schematic cross-sectional view of the transmission input shaft, and the radial deformation amount of each refinement grid to be used on the inner shaft wall 2101 of the transmission input shaft 210 at the position corresponding to the second bearing position may be obtained.
When the gear force working condition test is executed, optionally, different acting forces are applied to the finite element model, and the radial deformation quantity of each to-be-used refined grid corresponding to the transmission input shaft and the motor output shaft under different acting forces is determined, and the method comprises the following steps: determining a gear meshing node based on the gear pitch circle diameter of the input shaft of the transmission in the finite element model; and when the bearing interference force is applied to the second bearing in the finite element model, applying a transmission gear meshing force to the gear meshing node to obtain all radial deformation quantities corresponding to the inner wall of the transmission input shaft at the second bearing position and all radial deformation quantities corresponding to the outer wall of the motor output shaft at the second bearing position.
In practical applications, a gear mesh node can be determined based on the gear pitch circle diameter of the transmission input shaft in the finite element model, for example, see fig. 12, fig. 12 can be represented as establishing an RBE3 unit schematic diagram for the gear mesh point of the transmission input shaft, a slave point 2102 of an RBE3 unit 2105 can be used as a primary driving gear mesh node, a unit node on a nearby tooth surface 2103 and a tooth surface 2104 is a master point of an RBE3 unit 2105, and the primary driving gear mesh node 2102 can be used as a node on which transmission gear mesh force needs to be applied, namely, the gear mesh node, and the gear mesh node is on the gear pitch circle diameter. In determining the gear mesh force, the gear mesh force can be calculated according to the formula (1) based on the gear transmission torque M of the transmission input shaft, the gear mesh parameters, the gear load, and the like, wherein the formula (1) is as follows:
wherein the gear mesh forces include the circumferential force F of the gear t Radial force F r And axial force F a This can be applied by means of a local cylindrical coordinate system defined on the transmission input shaft axis. M is the torque transmitted by the gear, i.e. the torque transmitted by the gear, d is the pitch diameter of the gear, alpha n Is the normal pressure angle of the gear, and beta is the helical angle at the pitch circle of the gear. The transmission gear meshing force can be applied to the gear meshing node when bearing interference force is applied to the second bearing in the finite element model, further, the finite element model can be calculated and analyzed for the three-bearing structure, and the analysis result of the three-bearing finite element model in the gear force working condition test can be iteratively calculated and output by adopting a Newton-Laplacson method. Further, the analysis result may be processed to extract respective amounts of radial deformation corresponding to the shaft inner wall (i.e., inner surface) of the transmission input shaft at the second bearing position and the shaft outer wall (i.e., outer surface) of the motor output shaft at the second bearing positionCorresponding respective amounts of radial deformation, for example, with reference to fig. 13, fig. 13 may be represented as a motor output shaft cross-sectional schematic, wherein reference 2506 in fig. 13 may be represented as a shaft outer wall 2506 of the motor output shaft 250 at a location corresponding to the second bearing location.
When the eccentric force working condition test is executed, optionally, different acting forces are applied to the finite element model, and the radial deformation quantity of each to-be-used refined grid corresponding to the transmission input shaft and the motor output shaft under different acting forces is determined, and the method comprises the following steps: determining a motor load slave point of a motor output shaft in the finite element model; and when bearing interference force is applied to the second bearing in the finite element model, applying motor eccentric load to the motor load from points to obtain all radial deformation quantities corresponding to the inner wall of the transmission input shaft at the position of the second bearing and all radial deformation quantities corresponding to the outer wall of the motor output shaft at the position of the second bearing.
In practical application, the slave point of the RBE3 unit can be determined by the RBE3 unit as the motor load slave point of the motor output shaft in the finite element model. The eccentric load may be applied to the motor load from a point when bearing interference force is applied to the second bearing in the finite element model, for example, with continued reference to fig. 10, the eccentric load F (maximum unilateral magnetic pull) to which the motor output shaft is subjected during operation may be applied to the slave point 2505 of the RBE3 unit 2504 in a static load manner, and the direction of the eccentric load is the R-axis direction of the cylindrical coordinate system 2503. Furthermore, the calculation analysis of the finite element model can be carried out on the three-bearing structure, and the analysis result of the three-bearing finite element model in the eccentric force working condition test can be output by adopting the Newton-Lapsson method through iterative calculation. The analysis results may be processed to extract respective radial deformation amounts corresponding to the shaft inner wall (i.e., the inner surface) of the transmission input shaft at the second bearing position and respective radial deformation amounts corresponding to the shaft outer wall (i.e., the outer surface) of the motor output shaft at the second bearing position.
And S130, determining a target deformation amount based on the radial deformation amounts.
In practical application, each radial deformation amount may be processed to obtain a target deformation amount for determining the fit tolerance, for example, a corresponding radial deformation amount to be used may be determined in each radial deformation amount under each test condition, and then the target deformation amount may be determined based on the determined radial deformation amount to be used.
Optionally, determining the minimum radial deformation amount of the shaft inner wall of the transmission input shaft at the second bearing position under different acting forces; determining the maximum radial deformation amount of the shaft outer wall of the motor output shaft at the position of the second bearing under different acting forces; and determining the target deformation quantity based on the minimum radial deformation quantities and the maximum radial deformation quantities.
In practical application, under the pre-tightening working condition test, the minimum radial deformation quantity in all radial deformation quantities corresponding to the shaft inner wall of the transmission input shaft at the second bearing position can be extracted and recorded as u 1 (ii) a In the gear force condition test, the minimum radial deformation amount of the radial deformation amounts corresponding to the shaft inner wall of the transmission input shaft at the second bearing position can be extracted and recorded as u 2 And the largest radial deformation amount among the radial deformation amounts corresponding to the shaft outer wall of the motor output shaft at the second bearing position is recorded as u 3 (ii) a For an eccentric force working condition test, the minimum radial deformation amount in all radial deformation amounts corresponding to the shaft inner wall of the transmission input shaft at the position of the second bearing can be extracted and recorded as u 4 And the maximum radial deformation amount of the radial deformation amounts corresponding to the shaft outer wall of the motor output shaft at the second bearing position is recorded as u 5 . The radial deformation obtained under the three working conditions can be calculated according to the formula (2), so that the target deformation under the combined action of the bearing interference, the gear force and the eccentric force is obtained, and the target deformation is recorded as shown in the formula (2) as follows:
U＝∑|u i |,(i＝1，2，…，5) (2)
wherein U can be expressed as a target deformation amount, U i And (i-1, 2, …,5) are the corresponding radial deformation amounts obtained under the three test conditions.
And S140, determining the fit tolerance between the transmission input shaft and the motor output shaft based on the target deformation amount.
In practical application, the shaft fit tolerance of the output shaft of the motor and the input shaft of the transmission at the position corresponding to the middle bearing under the three-bearing structure can be determined according to the target deformation amount, and optionally, the shaft fit tolerance should be larger than the obtained target deformation amount U.
According to the technical scheme of the embodiment, at least one to-be-used refined grid is obtained by carrying out grid division on contact parts among a transmission input shaft, a motor output shaft, a first bearing, a second bearing and a third bearing in a finite element model, different acting forces are applied to the finite element model, radial deformation quantities of the to-be-used refined grids corresponding to the transmission input shaft and the motor output shaft under different acting forces are determined, a target deformation quantity is determined based on the radial deformation quantities, and then a matching tolerance between the transmission input shaft and the motor output shaft is determined based on the target deformation quantity, so that the problem of low matching tolerance determination accuracy caused by determining the matching tolerance between shafts of three bearing structures based on manual experience in the prior art is solved, and the radial deformation quantities corresponding to the transmission input shaft and the motor output shaft under different acting forces are determined when different acting forces are applied to the finite element model, the method combines different test working conditions, determines a target deformation amount based on the radial deformation amount under each test working condition, determines the fit tolerance between the shafts of the three-bearing structure based on the target deformation amount, and achieves the technical effects of improving the test precision and efficiency while improving the accuracy of the fit tolerance determination between the shafts.
Example two
As an alternative embodiment of the above embodiment, in order to make the technical solutions of the embodiments of the present invention further clear to those skilled in the art, a specific application scenario example is given. Specifically, the following details can be referred to.
For example, with continued reference to fig. 2, a finite element model of a three-bearing structure assembly may be established, all components in the three-bearing structure may be respectively meshed, the three-bearing structure includes a transmission input shaft 220, a motor output shaft 250, a first bearing 220, a second bearing 230, and a third bearing 240, and the meshes after being divided are assembled together to construct the finite element model. During the mesh division, the contact parts among the transmission input shaft 220, the motor output shaft 250, the first bearing 220, the second bearing 230 and the third bearing 240 can be subjected to refined mesh division to obtain at least one refined mesh to be used, and the rest part of the structure can be subjected to coarse mesh division to obtain at least one coarsened mesh. For example, the transmission input shaft and the motor output shaft are in contact by means of splines, and with consideration of calculation accuracy and calculation speed, with reference to fig. 3, the meshes of the tooth surfaces of the motor output shaft spline 2501 and the transmission input shaft spline 2101 may be divided into grids in a partitioned manner, and both ends of the middle part of the tooth surface of the spline may be thinned to form a spline tooth surface thinned grid and a spline tooth surface roughened grid. In the actual modeling process, with continued reference to fig. 4, both motor output shaft spline 2501 and transmission input shaft spline 2101 may be modeled using axial symmetry based on the symmetric nature of the splines, e.g., to create only a single spline tooth surface grid, with continued reference to fig. 5, one spline tooth surface in motor output shaft spline 2501 may be divided into a spline tooth surface refinement grid 25011 (i.e. a refinement grid to be used) and a spline tooth surface coarsening grid 25012, furthermore, a complete spline grid model can be established through axial symmetry, meanwhile, the calculation accuracy and the calculation convergence of the interference contact are considered, the contact areas of the transmission input shaft 220, the motor output shaft 250, the first bearing 220, the second bearing 230 and the third bearing 240 may be cut to form regular geometric areas, so that the unit nodes of the contact part grids are in one-to-one correspondence, and an interference contact relationship corresponding to the unit nodes is established.
On the basis of the above scheme, the elastic modulus of the finite element model may be defined as 210000MPa, the poisson ratio μ as 0.3, all the finite element models are mechanical property data such as linear elastic material, and finite element model boundary conditions, that is, a first model boundary condition and a second model boundary condition may be applied, where the first model boundary condition is all degrees of freedom of the fixed bearing except the axial rotational degree of freedom. The second model boundary condition is to fix the axial rotational degree of freedom of the motor output shaft. It should be noted that the first model boundary condition and the second model boundary condition may separately constrain the finite element model. For example, with continued reference to fig. 6, when fixing the bearing outer ring 2201 in fig. 6, it is applied by means of RBE3 unit, with continued reference to fig. 7, the master point 2202 of RBE3 unit selects the outer ring surface of the bearing outer ring 2201, the geometric center of the bearing is selected from the point 2203, and with continued reference to fig. 8, when bound, the slave point 2203 of RBE3 unit 2202 can be unconstrained around the 6 o' clock direction freedom of the cylindrical coordinate system 2204, and all other degrees of freedom can be constrained, the Z-axis of the cylindrical coordinate system 2204 is along the gear shaft axis direction, the R-axis is along the radial direction of the gear shaft, and the t-axis is determined by Z, R according to the right-hand criterion. While the freedom of axial rotation of motor output shaft 250 is fixed, as shown in fig. 9, it is applied by RBE3 unit, as shown in fig. 10, the main point 2502 of RBE3 unit 2504 selects the outer surface of motor output shaft 250, the auxiliary point 2505 selects the geometric center of motor output shaft 250, and in the boundary constraint, it can only constrain the freedom of auxiliary point 2505 of RBE3 unit 2504 around the 6 o' clock direction of cylindrical coordinate system 2503. In the process of finite element model stress analysis, all degrees of freedom of the fixed bearing except the axial rotational degree of freedom and the axial rotational degree of freedom of the fixed motor output shaft are used for improving the precision of model analysis.
On the basis of the above scheme, different test working conditions can be designed, different acting forces are applied under different test working conditions, correspondingly, the radial deformation quantity of the refined grid to be used under different test working conditions can be obtained, for example, the test working conditions can be respectively as follows: a pre-tightening working condition, a gear force working condition and an eccentric force working condition. The boundary conditions used for the three test conditions are both the first model boundary condition and the second model boundary condition. When the pre-tightening working condition test is executed, the interference magnitude of the inner ring of the bearing, namely the interference force of the bearing, can be loaded, and the meshing force of the transmission gear and the eccentric load of the motor are not applied. In performing the gear force condition test, the transmission gear mesh force may be applied on the basis of the pretensioning condition, for example, with reference to fig. 12, the primary driving gear mesh node 2102 may be a slave point of the RBE3 unit 2105, the unit nodes on the adjacent tooth surface 2103 and the tooth surface 2104 may be a master point of the RBE3 unit 2105, and the primary driving gear mesh node 2102 may be used as a node at which the transmission gear mesh force is required to be applied, i.e., a gear mesh node, which is on the gear pitch circle diameter. When determining the gear engagement force of the transmission, the gear engagement force can be calculated according to the formula (1) according to the gear transmission torque of the input shaft of the transmission, the gear engagement parameters, the gear load and the like, wherein the formula (1) is as follows:
wherein the gear mesh forces include the circumferential force F of the gear t Radial force F r And axial force F a This can be applied by means of a local cylindrical coordinate system defined on the transmission input shaft axis. M is the torque transmitted by the gear, i.e. the torque transmitted by the gear, d is the pitch diameter of the gear, alpha n Is the normal pressure angle of the gear, and beta is the helical angle at the pitch circle of the gear. In the case of performing the eccentric force condition test, the eccentric load of the motor may be applied on the basis of the pretension condition, for example, with reference to fig. 10, the eccentric load F (maximum unilateral magnetic pull force) applied to the output shaft of the motor during the operation may be applied to the slave point 2505 of the RBE3 unit 2504 in a static load manner, and the direction of the eccentric load is the R-axis direction of the cylindrical coordinate system 2503. The time period of each test working condition is set to be 1, the time increment is set to be 0.1, and the Newton-Laplacian method is adopted to iteratively calculate and output the analysis result of the three-bearing finite element model in the test of the three working conditions. The minimum radial deformation amount of the radial deformation amounts corresponding to the shaft inner wall of the transmission input shaft at the second bearing position can be extracted and recorded as u 1 (ii) a In the gear force condition test, the minimum radial deformation amount of the radial deformation amounts corresponding to the shaft inner wall of the transmission input shaft at the second bearing position can be extracted and recorded as u 2 And the largest radial deformation amount among the radial deformation amounts corresponding to the shaft outer wall of the motor output shaft at the second bearing position is recorded as u 3 (ii) a For the eccentric force working condition test, the minimum radial deformation quantity in all radial deformation quantities corresponding to the shaft inner wall of the transmission input shaft at the position of the second bearing can be extracted and recorded as u 4 And the largest radial deformation amount among the radial deformation amounts corresponding to the shaft outer wall of the motor output shaft at the second bearing position is recorded as u 5 . Can be divided into threeThe radial deformation obtained under each working condition is calculated according to a formula (2), and a target deformation under the combined action of bearing interference, gear force and eccentric force is obtained and recorded as follows in the formula (2):
U＝∑|u i |,(i＝1，2，…，5) (2)
wherein U can be expressed as a target deformation amount, U i And (i-1, 2, …,5) are the corresponding radial deformation amounts obtained under the three test conditions. Further, the shaft fit tolerance of the output shaft of the motor and the input shaft of the transmission at the position corresponding to the middle bearing under the three-bearing structure can be determined according to the target deformation amount, and optionally, the shaft fit tolerance should be larger than the obtained target deformation amount U.
According to the technical scheme of the embodiment, at least one to-be-used refined grid is obtained by carrying out grid division on contact parts among a transmission input shaft, a motor output shaft, a first bearing, a second bearing and a third bearing in a finite element model, different acting forces are applied to the finite element model, radial deformation quantities of the to-be-used refined grids corresponding to the transmission input shaft and the motor output shaft under different acting forces are determined, a target deformation quantity is determined based on the radial deformation quantities, and then a matching tolerance between the transmission input shaft and the motor output shaft is determined based on the target deformation quantity, so that the problem of low matching tolerance determination accuracy caused by determining the matching tolerance between shafts of three bearing structures based on manual experience in the prior art is solved, and the radial deformation quantities corresponding to the transmission input shaft and the motor output shaft under different acting forces are determined when different acting forces are applied to the finite element model, the method combines different test working conditions, determines a target deformation amount based on the radial deformation amount under each test working condition, determines the fit tolerance between the shafts of the three-bearing structure based on the target deformation amount, and achieves the technical effects of improving the test precision and efficiency while improving the accuracy of the fit tolerance determination between the shafts.
EXAMPLE III
Fig. 14 is a schematic structural diagram of a fit tolerance determining apparatus according to a third embodiment of the present invention. As shown in fig. 14, the apparatus includes: a refined grid determination module 410, a radial deformation amount determination module 420, a target deformation amount determination module 430 and a fit tolerance determination module 440 are to be used.
The to-be-used refined grid determining module 410 is configured to construct a finite element model based on a transmission input shaft, a motor output shaft, a first bearing, a second bearing and a third bearing, and perform grid division on contact components among the transmission input shaft, the motor output shaft, the first bearing, the second bearing and the third bearing to obtain at least one to-be-used refined grid; a radial deformation amount determining module 420, configured to apply different acting forces to the finite element model, and determine radial deformation amounts of the to-be-used refined grids corresponding to the transmission input shaft and the motor output shaft under different acting forces; wherein the direction of the radial deformation is perpendicular to the respective shaft bottom surface; a target deformation amount determining module 430, configured to determine a target deformation amount based on each radial deformation amount; a fit tolerance determination module 440 to determine a fit tolerance between the transmission input shaft and the motor output shaft based on the target amount of deformation.
In the technical scheme of the embodiment, at least one to-be-used refined grid is obtained by performing grid division on contact parts among a transmission input shaft, a motor output shaft, a first bearing, a second bearing and a third bearing in a finite element model, different acting forces are applied to the finite element model, radial deformation amounts of the to-be-used refined grids corresponding to the transmission input shaft and the motor output shaft under different acting forces are determined, a target deformation amount is determined based on the radial deformation amounts, and then a matching tolerance between the transmission input shaft and the motor output shaft is determined based on the target deformation amount, so that the problem of low accuracy of determining the matching tolerance due to determining the matching tolerance between shafts of three bearing structures based on manual experience in the prior art is solved, and the radial deformation amounts corresponding to the transmission input shaft and the motor output shaft under different acting forces are determined when different acting forces are applied to the finite element model, the method combines different test working conditions, determines a target deformation amount based on the radial deformation amount under each test working condition, determines the fit tolerance between the shafts of the three-bearing structure based on the target deformation amount, and achieves the technical effects of improving the test precision and efficiency while improving the accuracy of the fit tolerance determination between the shafts.
On the basis of the above device, optionally, the device further includes a finite element model first updating module, where the finite element model first updating module includes a mechanical property data determining unit and a finite element model first updating unit.
A mechanical property data determining unit for determining mechanical property data corresponding to the finite element model; wherein the mechanical property data comprises material property data and structural property data;
a finite element model first updating unit for updating the finite element model based on the mechanical property data.
On the basis of the above device, optionally, the device further includes a finite element model second updating module, and the finite element model second updating module includes a boundary condition determining unit and a finite element model second updating unit.
A boundary condition determining unit for determining a first model boundary condition and a second model boundary condition corresponding to the finite element model; wherein the first model boundary condition is determined based on fixing the first bearing, the second bearing, and the third bearing, and the second model boundary condition is determined based on fixing the motor output shaft;
a finite element model second updating unit for updating the finite element model based on the first model boundary condition and the second model boundary condition.
On the basis of the above device, optionally, the device further includes an acting force determining module.
The acting force determining module is used for determining each acting force applied to the finite element model; wherein the forces include bearing interference forces, transmission gear mesh forces and motor eccentric loads, the transmission gear mesh forces being determined based on a gear pitch diameter of the transmission input shaft, a gear transfer torque, a gear normal pressure angle and a helix angle at a gear pitch circle.
On the basis of the above device, optionally, the radial deformation amount determining module 420 includes a radial deformation amount determining first unit.
And the radial deformation quantity determination first unit is used for applying the bearing interference force to the second bearing in the finite element model to obtain the radial deformation quantity of each to-be-used refined grid corresponding to the shaft inner wall of the transmission input shaft at the position of the second bearing.
On the basis of the above device, optionally, the radial deformation amount determination module 420 includes a radial deformation amount determination second unit, and the radial deformation amount determination second unit includes a gear mesh node determination sub-unit and a radial deformation amount determination second sub-unit.
A gear meshing node determining subunit, configured to determine a gear meshing node based on a gear pitch circle diameter of the transmission input shaft in the finite element model;
and the radial deformation amount determining second determining subunit is used for applying the transmission gear meshing force to the gear meshing node when the bearing interference force is applied to the second bearing in the finite element model to obtain each radial deformation amount corresponding to the shaft inner wall of the transmission input shaft at the second bearing position and each radial deformation amount corresponding to the shaft outer wall of the motor output shaft at the second bearing position.
On the basis of the above device, optionally, the radial deformation amount determining module 420 includes a third radial deformation amount determining unit, and the third radial deformation amount determining unit includes a motor load determination subunit and a third radial deformation amount determination subunit.
A motor load slave point determining unit for determining a motor load slave point of the motor output shaft in the finite element model;
and the radial deformation quantity determination third subunit is used for applying the motor eccentric load to the motor load from a point when the bearing interference force is applied to the second bearing in the finite element model, so as to obtain various radial deformation quantities corresponding to the shaft inner wall of the transmission input shaft at the second bearing position and various radial deformation quantities corresponding to the shaft outer wall of the motor output shaft at the second bearing position.
On the basis of the above device, optionally, the target deformation amount determining module 430 includes a minimum radial deformation amount determining unit, a maximum radial deformation amount determining unit, and a target deformation amount determining unit.
A minimum radial deformation amount determination unit for determining a minimum radial deformation amount of the shaft inner wall of the transmission input shaft at the second bearing position under different acting forces; and
the maximum radial deformation quantity determining unit is used for determining the maximum radial deformation quantity of the shaft outer wall of the motor output shaft at the second bearing position under different acting forces;
and the target deformation quantity determining unit is used for determining the target deformation quantity based on the minimum radial deformation quantity and the maximum radial deformation quantity.
The fit tolerance determining device provided by the embodiment of the invention can execute the fit tolerance determining method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the executing method.
Example four
Fig. 15 is a schematic structural diagram of an electronic device implementing the fitting tolerance determination method according to the embodiment of the present invention. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device may also represent various forms of mobile devices, such as personal digital assistants, cellular phones, smart phones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
As shown in fig. 15, the electronic device 10 includes at least one processor 11, and a memory communicatively connected to the at least one processor 11, such as a Read Only Memory (ROM)12, a Random Access Memory (RAM)13, and the like, wherein the memory stores a computer program executable by the at least one processor, and the processor 11 may perform various suitable actions and processes according to the computer program stored in the Read Only Memory (ROM)12 or the computer program loaded from the storage unit 18 into the Random Access Memory (RAM) 13. In the RAM 13, various programs and data necessary for the operation of the electronic apparatus 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other via a bus 14. An input/output (I/O) interface 15 is also connected to bus 14.
A number of components in the electronic device 10 are connected to the I/O interface 15, including: an input unit 16 such as a keyboard, a mouse, or the like; an output unit 17 such as various types of displays, speakers, and the like; a storage unit 18 such as a magnetic disk, an optical disk, or the like; and a communication unit 19 such as a network card, modem, wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information/data with other devices via a computer network such as the internet and/or various telecommunication networks.
The processor 11 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, a Digital Signal Processor (DSP), and any suitable processor, controller, microcontroller, or the like. The processor 11 performs the various methods and processes described above, such as the fit tolerance determination method.
In some embodiments, the fit tolerance determination method may be implemented as a computer program that is tangibly embodied on a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program may be loaded and/or installed onto the electronic device 10 via the ROM 12 and/or the communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the fit tolerance determination method described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform the fit tolerance determination method by any other suitable means (e.g., by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuitry, Field Programmable Gate Arrays (FPGAs), Application Specific Integrated Circuits (ASICs), Application Specific Standard Products (ASSPs), system on a chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs that are executable and/or interpretable on a programmable system including at least one programmable processor, which may be special or general purpose, receiving data and instructions from, and transmitting data and instructions to, a storage system, at least one input device, and at least one output device.
Computer programs for implementing the methods of the present invention can be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be performed. A computer program can execute entirely on a machine, partly on a machine, as a stand-alone software package partly on a machine and partly on a remote machine or entirely on a remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. A computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) by which a user can provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic, speech, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a back-end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back-end, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), Wide Area Networks (WANs), blockchain networks, and the internet.
The computing system may include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical host and VPS service are overcome.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A fitting tolerance determining method, comprising:
constructing a finite element model based on a transmission input shaft, a motor output shaft, a first bearing, a second bearing and a third bearing, and performing meshing on contact parts among the transmission input shaft, the motor output shaft, the first bearing, the second bearing and the third bearing to obtain at least one refined mesh to be used;
applying different acting forces to the finite element model, and determining radial deformation quantities of the to-be-used refined grids corresponding to the transmission input shaft and the motor output shaft under different acting forces; wherein the direction of the radial deformation is perpendicular to the respective shaft bottom surface;
determining a target deformation quantity based on each radial deformation quantity;
determining a fit tolerance between the transmission input shaft and the motor output shaft based on the target amount of deformation.
2. The method of claim 1, further comprising:
determining mechanical property data corresponding to the finite element model; wherein the mechanical property data comprises material property data and structural property data;
updating the finite element model based on the mechanical property data.
3. The method of claim 1, further comprising:
determining a first model boundary condition and a second model boundary condition corresponding to the finite element model; wherein the first model boundary condition is determined based on fixing the first bearing, the second bearing, and the third bearing, and the second model boundary condition is determined based on fixing the motor output shaft;
updating the finite element model based on the first model boundary condition and the second model boundary condition.
4. The method of claim 1, wherein prior to said applying different forces to the finite element model and determining the amount of radial deformation for each of the transmission input shaft and the motor output shaft using the refined mesh at the different forces, further comprising:
determining each acting force applied to the finite element model; wherein the forces include bearing interference forces, transmission gear mesh forces and motor eccentric loads, the transmission gear mesh forces being determined based on a gear pitch diameter of the transmission input shaft, a gear transfer torque, a gear normal pressure angle and a helix angle at a gear pitch circle.
5. The method of claim 4, wherein the applying different forces to the finite element model and determining the amount of radial deformation of each of the to-be-used refined grids for the transmission input shaft and the motor output shaft under the different forces comprises:
and applying the bearing interference force to the second bearing in the finite element model to obtain the radial deformation quantity of each to-be-used refined grid corresponding to the shaft inner wall of the transmission input shaft at the position of the second bearing.
6. The method of claim 4, wherein the applying different forces to the finite element model and determining the amount of radial deformation of each of the to-be-used refined grids for the transmission input shaft and the motor output shaft under the different forces comprises:
determining a gear mesh node based on a gear pitch circle diameter of the transmission input shaft in the finite element model;
and when the bearing interference force is applied to the second bearing in the finite element model, applying the transmission gear meshing force to the gear meshing node to obtain all radial deformation quantities corresponding to the shaft inner wall of the transmission input shaft at the second bearing position and all radial deformation quantities corresponding to the shaft outer wall of the motor output shaft at the second bearing position.
7. The method of claim 4, wherein the applying different forces to the finite element model to determine the radial deformation amount of each of the to-be-used refined grids for the transmission input shaft and the motor output shaft under the different forces comprises:
determining a motor load slave point of the motor output shaft in the finite element model;
and when the bearing interference force is applied to the second bearing in the finite element model, applying the motor eccentric load to the motor load from a point to obtain all radial deformation quantities corresponding to the shaft inner wall of the transmission input shaft at the second bearing position and all radial deformation quantities corresponding to the shaft outer wall of the motor output shaft at the second bearing position.
8. The method of claim 1, wherein determining a target amount of deformation based on each radial amount of deformation comprises:
determining the minimum radial deformation amount of the shaft inner wall of the transmission input shaft at the second bearing position under different acting forces; and
determining the maximum radial deformation amount of the shaft outer wall of the motor output shaft at the second bearing position under different acting forces;
and determining the target deformation quantity based on the minimum radial deformation quantities and the maximum radial deformation quantities.
9. A fit tolerance determining apparatus, comprising:
the to-be-used refined grid determining module is used for constructing a finite element model based on a transmission input shaft, a motor output shaft, a first bearing, a second bearing and a third bearing, and performing grid division on contact parts among the transmission input shaft, the motor output shaft, the first bearing, the second bearing and the third bearing to obtain at least one to-be-used refined grid;
the radial deformation quantity determining module is used for applying different acting forces to the finite element model and determining the radial deformation quantity of each to-be-used refined grid corresponding to the transmission input shaft and the motor output shaft under different acting forces; wherein the direction of the radial deformation is perpendicular to the respective shaft bottom surface;
the target deformation quantity determining module is used for determining a target deformation quantity based on each radial deformation quantity;
and the fit tolerance determination module is used for determining the fit tolerance between the transmission input shaft and the motor output shaft based on the target deformation quantity.
10. An electronic device, characterized in that the electronic device comprises:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the fit tolerance determination method of any one of claims 1-8.
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