CN113591222B - Method, device and equipment for detecting oil leakage risk of gearbox joint surface - Google Patents
Method, device and equipment for detecting oil leakage risk of gearbox joint surface Download PDFInfo
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- CN113591222B CN113591222B CN202110899880.0A CN202110899880A CN113591222B CN 113591222 B CN113591222 B CN 113591222B CN 202110899880 A CN202110899880 A CN 202110899880A CN 113591222 B CN113591222 B CN 113591222B
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000005540 biological transmission Effects 0.000 claims abstract description 197
- 238000004088 simulation Methods 0.000 claims abstract description 139
- 238000010008 shearing Methods 0.000 claims abstract description 103
- 238000004458 analytical method Methods 0.000 claims abstract description 79
- 238000011156 evaluation Methods 0.000 claims abstract description 59
- 238000007789 sealing Methods 0.000 claims abstract description 37
- 238000012360 testing method Methods 0.000 claims abstract description 31
- 239000000725 suspension Substances 0.000 claims description 31
- 238000001514 detection method Methods 0.000 claims description 29
- 239000000463 material Substances 0.000 claims description 24
- 239000011499 joint compound Substances 0.000 claims description 7
- 238000010276 construction Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 12
- 239000003921 oil Substances 0.000 description 106
- 238000013461 design Methods 0.000 description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 238000004364 calculation method Methods 0.000 description 8
- 239000000741 silica gel Substances 0.000 description 8
- 229910002027 silica gel Inorganic materials 0.000 description 8
- 239000013598 vector Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 5
- 238000012356 Product development Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 230000036316 preload Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010705 motor oil Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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- Aviation & Aerospace Engineering (AREA)
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- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- General Details Of Gearings (AREA)
Abstract
The invention relates to the technical field of vehicles, and discloses a method, a device and equipment for detecting oil leakage risk of a box closing surface of a transmission, wherein the method comprises the following steps: constructing a finite element analysis model of a transmission shell according to parameter information of the transmission; performing simulation working condition test based on a finite element analysis model of the transmission shell to obtain a simulation result; determining the contact opening amount and the contact shearing ratio on the joint box surface of the transmission according to the simulation result; judging whether oil leakage risks exist on the joint box surface according to the relation between the contact opening amount and the evaluation index of the normal opening amount and the relation between the contact shearing ratio and the evaluation index of the shearing direction stress ratio. Therefore, the relation between the contact opening amount, the contact shearing ratio and the evaluation index can be determined through finite element simulation analysis, and the oil leakage risk of the transmission box closing surface is detected, so that the oil leakage risk of the transmission box closing surface in the working process of a vehicle can be checked in time, and the sealing performance of the vehicle when the vehicle runs under a simulation working condition is further ensured.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a method, a device and equipment for detecting oil leakage risk of a box closing surface of a transmission.
Background
The box closing surface of the transmission shell is sealed by silica gel, the sealing performance of the silica gel is strongly related to the deformation of the box closing surface under load, the sealing performance needs to meet the normal opening vector of the deformation of the box closing surface, but the existing detection method only considers the normal opening vector of the box closing surface, and the risk that the single evaluation index possibly causes the engine oil leakage of the box closing surface of the transmission shell cannot be detected.
The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art.
Disclosure of Invention
The invention mainly aims to provide a method, a device and equipment for detecting oil leakage risk of a transmission joint box surface, and aims to solve the technical problem that in the prior art, an analysis method is single in evaluation index, and the risk of engine oil leakage of the transmission joint box surface cannot be detected in time.
In order to achieve the above purpose, the invention provides a method for detecting oil leakage risk of a transmission joint surface, comprising the following steps:
constructing a finite element analysis model of a transmission shell according to parameter information of the transmission;
performing a simulation working condition test based on the finite element analysis model of the transmission shell to obtain a simulation result;
determining the contact opening amount and the contact shearing ratio on the joint box surface of the transmission according to the simulation result;
judging whether oil leakage risks exist on the box closing surface according to the relation between the contact opening amount and the evaluation index of the normal opening amount and the relation between the contact shearing ratio and the evaluation index of the shearing direction stress ratio.
Optionally, the judging whether the oil leakage risk exists on the joint box surface according to the relation between the contact opening amount and the evaluation index of the normal opening amount and the relation between the contact shearing ratio and the evaluation index of the shearing direction stress ratio comprises:
acquiring a first preset value corresponding to an evaluation index of the normal opening quantity and a second preset value corresponding to an evaluation index of the shearing direction stress ratio;
and when the contact opening amount is larger than the first preset value and/or the contact shearing ratio is larger than the second preset value, judging that oil leakage risks exist on the box closing surface.
Optionally, the constructing a finite element analysis model of the transmission housing according to the parameter information of the transmission includes:
Acquiring parameter information of a transmission;
Determining a geometric model and material parameters of a transmission shell corresponding to the transmission according to the parameter information;
and constructing a transmission shell finite element analysis model according to the transmission shell geometric model and the material parameters.
Optionally, the constructing a transmission housing finite element analysis model according to the transmission housing geometric model and the material parameters includes:
Performing finite element mesh division according to the geometric model of the transmission shell to obtain an initial finite element analysis model;
and adding material properties on the basis of the initial finite element analysis model according to the material parameters to obtain the finite element analysis model of the transmission shell.
Optionally, the performing a simulation condition test based on the finite element analysis model of the transmission housing to obtain a simulation result includes:
Performing contact treatment on a joint box surface in the finite element analysis model of the transmission shell to obtain a sealing performance simulation model;
And applying bolt pretightening force, bearing load force and suspension load force on the sealing performance simulation model to test simulation working conditions and obtain a simulation result.
Optionally, the applying the bolt pretightening force, the bearing load force and the suspension load force on the sealing performance simulation model includes:
determining bolt parameters and pretightening force parameters according to the parameter information;
constructing an entity bolt model according to the bolt parameters and the pretightening force parameters;
applying bolt pretightening force on the sealing simulation model through the entity bolt model;
Bearing load force is applied to the bearing seat position of the seal simulation model, and suspension load force is applied to the elastic center point of the suspension bracket of the seal simulation model.
Optionally, the applying bearing load force at the bearing seat position of the seal simulation model and applying suspension load force at the suspension bracket elastic center point of the seal simulation model includes:
Bearing load force is applied to the bearing seat position on the joint box surface of the seal simulation model;
And applying a suspension load force to the elastic center point of the suspension bracket on the box body corresponding to the box assembling surface of the seal simulation model.
Optionally, the determining the contact opening amount and the contact shearing ratio on the joint box surface of the transmission according to the simulation result includes:
Determining the contact opening amount, the contact forward force and the contact shearing force on the joint box surface of the transmission according to the simulation result;
and calculating a contact shear ratio according to the contact forward force and the contact shear force.
In addition, in order to achieve the above object, the present invention further provides a device for detecting oil leakage risk of a transmission joint surface, the device for detecting oil leakage risk of a transmission joint surface comprising:
The model construction module is used for constructing a finite element analysis model of the transmission shell according to the parameter information of the transmission;
The simulation working condition module is used for carrying out simulation working condition test based on the finite element analysis model of the transmission shell to obtain a simulation result;
The result analysis module is used for determining the contact opening amount and the contact shearing ratio on the joint box surface of the transmission according to the simulation result;
And the oil leakage detection module is used for judging whether oil leakage risks exist on the box closing surface according to the relation between the contact opening amount and the evaluation index of the normal opening amount and the relation between the contact shearing ratio and the evaluation index of the shearing direction stress ratio.
In addition, in order to achieve the above purpose, the present invention further provides a device for detecting oil leakage risk of a transmission joint surface, the device for detecting oil leakage risk of a transmission joint surface comprising: the device comprises a memory, a processor and a transmission joint-face oil leakage risk detection program which is stored in the memory and can run on the processor, wherein the transmission joint-face oil leakage risk detection program realizes the transmission joint-face oil leakage risk detection method when being executed by the processor.
In the method for detecting the oil leakage risk of the gearbox joint surface, a finite element analysis model of a gearbox shell is constructed according to the parameter information of the gearbox; performing a simulation working condition test based on the finite element analysis model of the transmission shell to obtain a simulation result; determining the contact opening amount and the contact shearing ratio on the joint box surface of the transmission according to the simulation result; judging whether oil leakage risks exist on the box closing surface according to the relation between the contact opening amount and the evaluation index of the normal opening amount and the relation between the contact shearing ratio and the evaluation index of the shearing direction stress ratio. Therefore, the contact opening amount and the contact shearing ratio can be determined in a finite element simulation analysis mode, and the oil leakage risk of the transmission joint box surface is detected according to the relation between the contact opening amount and the evaluation index of the normal opening amount and the relation between the contact shearing ratio and the evaluation index of the shearing direction stress ratio, so that the oil leakage risk of the transmission joint box surface in the working process of a vehicle can be checked in time, and the sealing performance of the vehicle in running under a simulation working condition is further ensured.
Drawings
FIG. 1 is a schematic diagram of a transmission joint box surface oil leakage risk detection device in a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a first embodiment of a method for detecting risk of oil leakage from a joint surface of a transmission according to the present invention;
FIG. 3 is a schematic diagram of a simulation prediction flow of an oil leakage problem according to an embodiment of a method for detecting oil leakage risk of a transmission joint surface of the present invention;
FIG. 4 is a schematic flow chart of a second embodiment of a method for detecting risk of oil leakage from a joint surface of a transmission according to the present invention;
FIG. 5 is a schematic flow chart of a third embodiment of a method for detecting risk of oil leakage from a joint surface of a transmission according to the present invention;
Fig. 6 is a schematic functional block diagram of a first embodiment of the oil leakage risk detection device for the case closing face of the transmission.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a transmission joint-box surface oil leakage risk detection device in a hardware operation environment according to an embodiment of the present invention.
As shown in fig. 1, the transmission joint-face oil leakage risk detection apparatus may include: a processor 1001, such as a central processing unit (Central Processing Unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, a memory 1005. Wherein the communication bus 1002 is used to enable connected communication between these components. The user interface 1003 may include a Display, an input unit such as keys, and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., wi-Fi interface). The memory 1005 may be a high-speed random access memory (Random Access Memory, RAM) or a stable memory (non-volatile memory), such as a disk memory. The memory 1005 may also optionally be a storage device separate from the processor 1001 described above.
It will be appreciated by those skilled in the art that the arrangement shown in fig. 1 is not limiting of the transmission joint face oil leakage risk detection apparatus and may include more or fewer components than shown, or certain components may be combined, or a different arrangement of components.
As shown in fig. 1, the memory 1005, which is a storage medium, may include an operating system, a network communication module, a user interface module, and a transmission case-up surface oil leakage risk detection program.
In the transmission joint-face oil leakage risk detection device shown in fig. 1, the network interface 1004 is mainly used for connecting an external network and performing data communication with other network devices; the user interface 1003 is mainly used for connecting user equipment and communicating data with the user equipment; the device of the present invention invokes the transmission case closing face oil leakage risk detection program stored in the memory 1005 through the processor 1001, and executes the transmission case closing face oil leakage risk detection method provided by the embodiment of the present invention.
Based on the hardware structure, the embodiment of the method for detecting the oil leakage risk of the box closing surface of the transmission is provided.
Referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of a method for detecting oil leakage risk of a transmission joint surface according to the present invention.
In a first embodiment, the transmission case-closing surface oil leakage risk detection method includes the following steps:
and S10, constructing a finite element analysis model of the transmission shell according to the parameter information of the transmission.
It should be noted that, the execution body of the embodiment may be a device for detecting oil leakage risk of the joint surface of the transmission, for example, a terminal device with computing capability, or other devices capable of implementing the same or similar functions, which is not limited in this embodiment, and in this embodiment, the device for detecting oil leakage risk of the joint surface of the transmission is described as an example.
It should be understood that the scheme of the embodiment establishes a simulation analysis method and an evaluation index of sealing performance aiming at the sealing form of the transmission joint-box surface so as to detect the oil leakage risk condition of the transmission joint-box surface.
It can be understood that under the condition of considering bolt pretightening force when the deformation of the joint box surface is calculated, the internal gear load of the transmission and the external load under the limit condition of the vehicle are also considered, the positive pressure of the joint box surface under the action of the load force is obtained, the positive pressure is normal force, and the positive pressure does not generate larger opening amount, so that the silica gel tensile failure is caused; on the other hand, the stress in the shearing direction generated under the action of the bolt pretightening force, the transmission gear exciting force and the external exciting force needs to be met, the stress in the shearing direction cannot cause the shearing damage failure of the silica gel, and the two technical requirements are required to be met in order to ensure that the oil leakage problem does not occur on the shell joint surface. According to the technical scheme, an evaluation method for stress in the shearing direction is established according to the verification result of multiple tests, and the evaluation method is favorable for providing accuracy for judging oil leakage risks.
It should be understood that, as shown in fig. 3, fig. 3 is a schematic diagram of a simulation prediction flow of an oil leakage problem, and the working principle of the present solution is as follows: and establishing a finite element analysis model of the transmission shell by using a computer-aided analysis tool, firstly loading bolt pretightening force, secondly loading simulation working conditions and boundaries to be inspected in seal calculation, and checking analysis results after calculation is completed. The simulation working condition and the boundary can be limit working conditions, so that the tightness of the sealing surface in the whole operation process is guaranteed; the simulation working condition and boundary can consider bolt pretightening force, bearing load force, external load force and the like, and the analysis result can at least output contact opening amount, contact positive pressure, contact shearing force, contact axial force and the like, so that more or fewer parameters can be included besides the conditions, and the embodiment is not limited to the conditions. By judging the calculation result, whether the oil leakage risk exists on the box closing surface or not can be judged.
It will be appreciated that parametric information for the transmission may be obtained, a transmission housing geometry model and material parameters corresponding to the transmission may be determined based on the parametric information, and a transmission housing finite element analysis model may be constructed based on the transmission housing geometry model and material parameters. In addition, the parameter information of the transmission may be related design information of the transmission, and the parameter information may include parameters such as a geometric model of a transmission housing, material parameters, bolt parameters, pretightening force parameters, and other parameters, which are not limited in this embodiment. The transmission housing geometry model may be a corresponding design drawing model of the transmission, such as a CAD model, for example, which is not limited in this embodiment.
In a specific implementation, a calculation auxiliary tool can be used for carrying out finite element mesh division on a geometric model of the transmission shell, mesh quality is checked to obtain an initial finite element analysis model, and then material properties are added on the basis of the initial finite element analysis model according to material parameters to obtain the finite element analysis model of the transmission shell.
And step S20, performing simulation working condition test based on the finite element analysis model of the transmission shell to obtain a simulation result.
It should be appreciated that after the transmission housing finite element analysis model is constructed, simulation conditions and boundaries may be loaded on the basis of the transmission housing finite element analysis model, and a simulation condition test may be performed to obtain simulation results.
And step S30, determining the contact opening amount and the contact shearing ratio on the joint box surface of the transmission according to the simulation result.
It is understood that the contact opening amount on the joint surface of the transmission can be directly determined according to the simulation result, and the contact shearing ratio on the joint surface of the transmission can be indirectly determined according to the simulation result. Wherein, the contact opening amount corresponds to the evaluation index of the normal opening amount, and the contact shearing ratio corresponds to the evaluation index of the shearing direction stress.
The contact opening amount is the normal opening amount of the two contact surfaces, and the contact shearing ratio can be calculated according to the contact forward force and the contact shearing force by the following formula:
X＝(CFMN*p)/CFSM；
wherein X is a contact shear ratio, CFMN is a contact forward force, CFSM is a contact shear force, and p is a preset friction coefficient. The preset friction coefficient may be a friction coefficient preset according to practical situations, which is not limited in this embodiment.
And S40, judging whether oil leakage risks exist on the box closing surface according to the relation between the contact opening amount and the evaluation index of the normal opening amount and the relation between the contact shearing ratio and the evaluation index of the shearing direction stress ratio.
It should be appreciated that after the contact opening amount and the contact shear ratio are determined, the normal opening amount of the joint compound face of the transmission can be evaluated according to the contact opening amount, the shear direction stress ratio of the joint compound face of the transmission can be evaluated according to the contact shear ratio, and then the joint compound face oil leakage risk detection can be performed by combining the normal opening amount and the shear direction stress ratio. Compared with the situation that only normal opening vectors are considered in the background art, the scheme of the embodiment considers not only the normal opening vectors but also shearing direction stress ratios, and the corresponding evaluation indexes of the direction opening vectors and the shearing direction stress ratios are respectively added, so that the sealing analysis of the silica gel is more reasonable and accurate.
Further, the step S40 includes:
acquiring a first preset value corresponding to an evaluation index of the normal opening quantity and a second preset value corresponding to an evaluation index of the shearing direction stress ratio; and when the contact opening amount is larger than the first preset value and/or the contact shearing ratio is larger than the second preset value, judging that oil leakage risks exist on the box closing surface.
It may be appreciated that a first preset value corresponding to an evaluation index of the normal opening amount and a second preset value corresponding to an evaluation value of the shearing direction stress ratio may be preset, where the first preset value and the second preset value may be set according to actual situations such as a model of a vehicle, a usage scenario, etc., and specific values of the first preset value and the second preset value are not limited in this embodiment, and in this embodiment, the first preset value is P1 and the second preset value is P2.
It can be appreciated that, because the contact opening amount and the contact shearing ratio are parameters for judging whether the oil leakage risk exists on the joint box surface of the transmission, the oil leakage risk exists on the joint box surface can be judged under the condition that one parameter does not meet the condition. The conditions in this embodiment are: the contact opening amount is lower than a first preset value, and the contact shearing ratio is lower than a second preset value.
It should be appreciated that after determining the contact opening amount and the contact shear ratio, the contact opening amount may be compared to a first preset value and the contact shear ratio may be compared to a second preset value, respectively, to determine whether the contact opening amount and the contact shear ratio satisfy the condition. When the contact opening amount is larger than a first preset value and/or the contact shearing ratio is larger than a second preset value, the oil leakage risk on the joint box surface is indicated; when the contact opening amount is smaller than or equal to a first preset value and the contact shearing ratio is smaller than or equal to a second preset value, the fact that the oil leakage risk does not exist on the box closing surface is indicated.
In specific implementation, under the condition that the first preset value is P1 and the second preset value is P2, when the contact opening amount is more than P1 and/or the contact shearing ratio is more than P2, judging that oil leakage risks exist on the box closing surface; when the contact opening amount is less than or equal to P1 and the contact shearing ratio is less than or equal to P2, judging that the oil leakage risk does not exist on the box closing surface.
It will be appreciated that after the oil leakage risk determination is made, if the current contact opening and contact shear ratio are satisfactory and it is determined that there is no oil leakage risk on the joint box face, this indicates that there is no problem with the design of the transmission housing, which can be frozen, and the production of the transmission housing is subsequently carried out in accordance with this design. If the current contact opening amount and the contact shearing ratio are not in accordance with the conditions, the defect of the design of the transmission shell is indicated if the oil leakage risk exists on the joint box surface, the user can be reminded of the oil leakage risk existing on the joint box surface, the user can be reminded of continuing to modify the design, and the next oil leakage risk test is carried out on the basis of the modified design after modification is completed until the oil leakage risk does not exist on the designed joint box surface, the transmission shell is produced according to the design without the oil leakage risk, and the oil leakage condition of the produced transmission joint box surface is avoided. According to the scheme, by means of the computer auxiliary tool, the oil leakage problem can be accurately predicted through simulation in the early development stage, the oil leakage problem can be avoided in the initial stage of product development, the product development cost and period are reduced, the cause of oil leakage can be checked according to the detection result, and an optimization scheme is provided according to the specific cause.
In this embodiment, a transmission case finite element analysis model is constructed from parameter information of the transmission; performing a simulation working condition test based on the finite element analysis model of the transmission shell to obtain a simulation result; determining the contact opening amount and the contact shearing ratio on the joint box surface of the transmission according to the simulation result; judging whether oil leakage risks exist on the box closing surface according to the relation between the contact opening amount and the evaluation index of the normal opening amount and the relation between the contact shearing ratio and the evaluation index of the shearing direction stress ratio. Therefore, the contact opening amount and the contact shearing ratio can be determined in a finite element simulation analysis mode, and the oil leakage risk of the transmission joint box surface is detected according to the relation between the contact opening amount and the evaluation index of the normal opening amount and the relation between the contact shearing ratio and the evaluation index of the shearing direction stress ratio, so that the oil leakage risk of the transmission joint box surface in the working process of a vehicle can be checked in time, and the sealing performance of the vehicle in running under a simulation working condition is further ensured.
In an embodiment, as shown in fig. 4, a second embodiment of the method for detecting risk of oil leakage of a joint surface of a transmission according to the present invention is provided based on the first embodiment, and the step S20 includes:
and step S201, carrying out contact treatment on the joint box surface in the finite element analysis model of the transmission shell to obtain a sealing performance simulation model.
It should be noted that, in the transmission case, there may be two joint surfaces, which are mutually fitted, and for convenience of description, these two joint surfaces are referred to as a first joint surface and a second joint surface, and the specific positions of the first joint surface and the second joint surface are not limited in this embodiment.
It will be appreciated that the first and second joint faces in the finite element analysis model of the transmission housing may be subjected to a contact process to seal the first and second joint faces, thereby obtaining a seal performance simulation model.
And S202, applying bolt pretightening force, bearing load force and suspension load force on the sealing performance simulation model to test a simulation working condition, and obtaining a simulation result.
It should be understood that after the sealing performance simulation model is obtained, bolt pretightening force, bearing load force and suspension load force can also be applied on the sealing performance simulation model, and simulation working condition tests can be performed through the simulation working conditions and boundaries.
Further, in order to achieve a better simulation analysis effect, in this embodiment, an influence of an external load on deformation of the joint box surface is added, and the step S202 includes:
Determining bolt parameters and pretightening force parameters according to the parameter information; constructing an entity bolt model according to the bolt parameters and the pretightening force parameters; applying bolt pretightening force on the sealing simulation model through the entity bolt model; bearing load force is applied to the bearing seat position of the seal simulation model, and suspension load force is applied to the elastic center point of the suspension bracket of the seal simulation model.
It should be appreciated that the pre-set bolt parameters and preload parameters may be determined based on the parameter information, then the solid bolt model is constructed based on the bolt parameters and preload parameters, and then the solid bolt model is combined with the seal simulation model to apply the bolt preload on the seal simulation model via the solid bolt model.
It should be understood that each joint box surface has a corresponding bearing seat position, and a bearing load force (maximum torque working condition) is applied to the bearing seat position, wherein the bearing load force may be a value preset according to the experimental test result. For example, the first joint box surface has a corresponding first bearing seat position, the second joint box surface has a corresponding second bearing seat position, and bearing load forces are applied to the first bearing seat position and the second bearing seat position.
It should be understood that the box body of the box closing surface is provided with a corresponding suspension bracket elastic center point, the suspension bracket elastic center point on the box body corresponding to the box closing surface of the seal simulation model can be determined first, and then a suspension load force (simulation working condition) is applied to the suspension bracket elastic center point, wherein the suspension load force can be a value preset according to the experimental test result.
In the embodiment, a sealing performance simulation model is obtained by carrying out contact treatment on a joint box surface in the transmission shell finite element analysis model; and applying bolt pretightening force, bearing load force and suspension load force on the sealing performance simulation model to test simulation working conditions and obtain a simulation result. Compared with the background analysis method, the method does not consider the condition that the vehicle is affected by external load and the load is incomplete when the load is applied, the external load is added in the scheme, the influence of the external load on the deformation of the joint box surface is considered, and the effect and the accuracy of the simulation test are improved through more comprehensive simulation working conditions and boundaries.
In an embodiment, as shown in fig. 5, a third embodiment of the method for detecting risk of oil leakage on a joint surface of a transmission according to the present invention is provided based on the first embodiment or the second embodiment, and in this embodiment, description is made based on the first embodiment, and the step S30 includes:
And step S301, determining the contact opening amount, the contact forward force and the contact shearing force on the joint box surface of the transmission according to the simulation result.
It should be appreciated that after simulation testing, the amount of Contact Opening (COPEN), the contact forward force (CFNM), and the contact shear force (CFSM) on the joint box surface can be extracted from the simulation results. In addition to these parameters, the simulation result may further include other parameters, which are not limited in this embodiment.
Step S302, calculating a contact shear ratio according to the contact forward force and the contact shear force.
It should be appreciated that after the contact forward force and the contact shear force are obtained, the contact shear ratio may be calculated from the contact forward force and the contact shear force. For example, the contact shear ratio can be calculated from the contact forward force and the contact shear force by the following formula:
X＝(CFMN*p)/CFSM；
wherein X is a contact shear ratio, CFMN is a contact forward force, CFSM is a contact shear force, and p is a preset friction coefficient. The preset friction coefficient may be a friction coefficient preset according to practical situations, which is not limited in this embodiment.
In the embodiment, the contact opening amount, the contact forward force and the contact shearing force on the joint box surface of the transmission are determined according to the simulation result; and calculating a contact shearing ratio according to the contact forward force and the contact shearing force, so that after a simulation test is carried out, the contact opening amount and the contact shearing ratio can be accurately determined according to a simulation result, and the method is used for judging the oil leakage risk of the box closing surface, and the accuracy of oil leakage risk detection is further improved.
In addition, referring to fig. 6, an embodiment of the present invention further provides a device for detecting oil leakage risk of a transmission joint surface, where the device for detecting oil leakage risk of a transmission joint surface includes:
The model construction module 10 is configured to construct a finite element analysis model of the transmission housing based on the parameter information of the transmission.
It should be understood that the scheme of the embodiment establishes a simulation analysis method and an evaluation index of sealing performance aiming at the sealing form of the transmission joint-box surface so as to detect the oil leakage risk condition of the transmission joint-box surface.
It can be understood that under the condition of considering bolt pretightening force when the deformation of the joint box surface is calculated, the internal gear load of the transmission and the external load under the limit condition of the vehicle are also considered, the positive pressure of the joint box surface under the action of the load force is obtained, the positive pressure is normal force, and the positive pressure does not generate larger opening amount, so that the silica gel tensile failure is caused; on the other hand, the requirements of the shearing direction stress generated under the actions of the bolt pretightening force, the transmission gear exciting force and the external exciting force are met, the shearing direction stress can not cause the shearing damage failure of the silica gel, and the two technical requirements are required to be met in order to ensure that the oil leakage problem does not occur on the shell joint surface. According to the technical scheme, an evaluation method for stress in the shearing direction is established according to the verification result of multiple tests, and the evaluation method is favorable for providing accuracy for judging oil leakage risks.
It should be understood that, as shown in fig. 3, fig. 3 is a schematic diagram of a simulation prediction flow of an oil leakage problem, and the working principle of the present solution is as follows: and establishing a finite element analysis model of the transmission shell by using a computer-aided analysis tool, firstly loading bolt pretightening force, secondly loading simulation working conditions and boundaries to be inspected in seal calculation, and checking analysis results after calculation is completed. The simulation working condition and the boundary can be limit working conditions, so that the tightness of the sealing surface in the whole operation process is guaranteed; the simulation working condition and boundary can consider bolt pretightening force, bearing load force, external load force and the like, and the analysis result can at least output contact opening amount, contact positive pressure, contact shearing force, contact axial force and the like, so that more or fewer parameters can be included besides the conditions, and the embodiment is not limited to the conditions. By judging the calculation result, whether the oil leakage risk exists on the box closing surface or not can be judged.
It will be appreciated that parametric information for the transmission may be obtained, a transmission housing geometry model and material parameters corresponding to the transmission may be determined based on the parametric information, and a transmission housing finite element analysis model may be constructed based on the transmission housing geometry model and material parameters. In addition, the parameter information of the transmission may be related design information of the transmission, and the parameter information may include parameters such as a geometric model of a transmission housing, material parameters, bolt parameters, pretightening force parameters, and other parameters, which are not limited in this embodiment. The transmission housing geometry model may be a corresponding design drawing model of the transmission, such as a CAD model, for example, which is not limited in this embodiment.
In a specific implementation, a calculation auxiliary tool can be used for carrying out finite element mesh division on a geometric model of the transmission shell, mesh quality is checked to obtain an initial finite element analysis model, and then material properties are added on the basis of the initial finite element analysis model according to material parameters to obtain the finite element analysis model of the transmission shell.
And the simulation working condition module 20 is used for carrying out simulation working condition test based on the finite element analysis model of the transmission shell to obtain a simulation result.
It should be appreciated that after the transmission housing finite element analysis model is constructed, simulation conditions and boundaries may be loaded on the basis of the transmission housing finite element analysis model, and a simulation condition test may be performed to obtain simulation results.
The result analysis module 30 is used for determining the contact opening amount and the contact shearing ratio on the joint box surface of the transmission according to the simulation result.
It is understood that the contact opening amount on the joint surface of the transmission can be directly determined according to the simulation result, and the contact shearing ratio on the joint surface of the transmission can be indirectly determined according to the simulation result. Wherein, the contact opening amount corresponds to an evaluation index of the normal opening amount, and the contact shearing ratio corresponds to an evaluation index of the shearing direction stress ratio.
The contact opening amount is the normal opening amount of the two contact surfaces, and the contact shearing ratio can be calculated according to the contact forward force and the contact shearing force by the following formula:
X＝(CFMN*p)/CFSM；
wherein X is a contact shear ratio, CFMN is a contact forward force, CFSM is a contact shear force, and p is a preset friction coefficient. The preset friction coefficient may be a friction coefficient preset according to practical situations, which is not limited in this embodiment.
And the oil leakage detection module 40 is configured to determine whether an oil leakage risk exists on the joint box surface according to the relationship between the contact opening amount and the evaluation index of the normal opening amount and the relationship between the contact shear ratio and the evaluation index of the shear direction stress ratio.
It should be appreciated that after the contact opening amount and the contact shear ratio are determined, the normal opening amount of the joint compound face of the transmission can be evaluated according to the contact opening amount, the shear direction stress ratio of the joint compound face of the transmission can be evaluated according to the contact shear ratio, and then the joint compound face oil leakage risk detection can be performed by combining the normal opening amount and the shear direction stress ratio. Compared with the situation that only normal opening vectors are considered in the background art, the scheme of the embodiment considers not only the normal opening vectors but also shearing direction stress ratios, and the corresponding evaluation indexes of the direction opening vectors and the shearing direction stress ratios are respectively added, so that the sealing analysis of the silica gel is more reasonable and accurate.
Further, the oil leakage detection module 40 is further configured to obtain a first preset value corresponding to an evaluation index of the normal opening amount, and a second preset value corresponding to an evaluation index of the shearing direction stress ratio; and when the contact opening amount is larger than the first preset value and/or the contact shearing ratio is larger than the second preset value, judging that oil leakage risks exist on the box closing surface.
It may be appreciated that a first preset value corresponding to an evaluation index of the normal opening amount and a second preset value corresponding to an evaluation value of the shearing direction stress ratio may be preset, where the first preset value and the second preset value may be set according to actual situations such as a model of a vehicle, a usage scenario, etc., and specific values of the first preset value and the second preset value are not limited in this embodiment, and in this embodiment, the first preset value is P1 and the second preset value is P2.
It can be appreciated that, because the contact opening amount and the contact shearing ratio are parameters for judging whether the oil leakage risk exists on the joint box surface of the transmission, the oil leakage risk exists on the joint box surface can be judged under the condition that one parameter does not meet the condition. The conditions in this embodiment are: the contact opening amount is lower than a first preset value, and the contact shearing ratio is lower than a second preset value.
It should be appreciated that after determining the contact opening amount and the contact shear ratio, the contact opening amount may be compared to a first preset value and the contact shear ratio may be compared to a second preset value, respectively, to determine whether the contact opening amount and the contact shear ratio satisfy the condition. When the contact opening amount is larger than a first preset value and/or the contact shearing ratio is larger than a second preset value, the oil leakage risk on the joint box surface is indicated; when the contact opening amount is smaller than or equal to a first preset value and the contact shearing ratio is smaller than or equal to a second preset value, the fact that the oil leakage risk does not exist on the box closing surface is indicated.
In specific implementation, under the condition that the first preset value is P1 and the second preset value is P2, when the contact opening amount is more than P1 and/or the contact shearing ratio is more than P2, judging that oil leakage risks exist on the box closing surface; when the contact opening amount is less than or equal to P1 and the contact shearing ratio is less than or equal to P2, judging that the oil leakage risk does not exist on the box closing surface.
It will be appreciated that after the oil leakage risk determination is made, if the current contact opening and contact shear ratio are satisfactory and it is determined that there is no oil leakage risk on the joint box face, this indicates that there is no problem with the design of the transmission housing, which can be frozen, and the production of the transmission housing is subsequently carried out in accordance with this design. If the current contact opening amount and the contact shearing ratio are not in accordance with the conditions, the defect of the design of the transmission shell is indicated if the oil leakage risk exists on the joint box surface, the user can be reminded of the oil leakage risk existing on the joint box surface, the user can be reminded of continuing to modify the design, and the next oil leakage risk test is carried out on the basis of the modified design after modification is completed until the oil leakage risk does not exist on the designed joint box surface, the transmission shell is produced according to the design without the oil leakage risk, and the oil leakage condition of the produced transmission joint box surface is avoided. According to the scheme, by means of the computer auxiliary tool, the oil leakage problem can be accurately predicted through simulation in the early development stage, the oil leakage problem can be avoided in the initial stage of product development, the product development cost and period are reduced, the cause of oil leakage can be checked according to the detection result, and an optimization scheme is provided according to the specific cause.
In this embodiment, a transmission case finite element analysis model is constructed from parameter information of the transmission; performing a simulation working condition test based on the finite element analysis model of the transmission shell to obtain a simulation result; determining the contact opening amount and the contact shearing ratio on the joint box surface of the transmission according to the simulation result; judging whether oil leakage risks exist on the box closing surface according to the relation between the contact opening amount and the evaluation index of the normal opening amount and the relation between the contact shearing ratio and the evaluation index of the shearing direction stress ratio. Therefore, the contact opening amount and the contact shearing ratio can be determined in a finite element simulation analysis mode, and the oil leakage risk of the transmission joint box surface is detected according to the relation between the contact opening amount and the evaluation index of the normal opening amount and the relation between the contact shearing ratio and the evaluation index of the shearing direction stress ratio, so that the oil leakage risk of the transmission joint box surface in the working process of a vehicle can be checked in time, and the sealing performance of the vehicle in the running process of a simulation working condition is further ensured.
In one embodiment, the model building module 10 is further configured to obtain parameter information of the transmission; determining a geometric model and material parameters of a transmission shell corresponding to the transmission according to the parameter information; and constructing a transmission shell finite element analysis model according to the transmission shell geometric model and the material parameters.
In an embodiment, the model building module 10 is further configured to perform finite element mesh division according to the transmission housing geometric model to obtain an initial finite element analysis model; and adding material properties on the basis of the initial finite element analysis model according to the material parameters to obtain the finite element analysis model of the transmission shell.
In an embodiment, the simulation working condition module 20 is further configured to perform contact processing on a joint box surface in the finite element analysis model of the transmission housing to obtain a sealing performance simulation model; and applying bolt pretightening force, bearing load force and suspension load force on the sealing performance simulation model to test simulation working conditions and obtain a simulation result.
In an embodiment, the simulation working condition module 20 is further configured to determine a bolt parameter and a pretightening force parameter according to the parameter information; constructing an entity bolt model according to the bolt parameters and the pretightening force parameters; applying bolt pretightening force on the sealing simulation model through the entity bolt model; bearing load force is applied to the bearing seat position of the seal simulation model, and suspension load force is applied to the elastic center point of the suspension bracket of the seal simulation model.
In an embodiment, the simulation working condition module 20 is further configured to apply a bearing load force at a bearing seat position on a joint box surface of the seal simulation model; and applying a suspension load force to the elastic center point of the suspension bracket on the box body corresponding to the box assembling surface of the seal simulation model.
In one embodiment, the result analysis module 30 is further configured to determine a contact opening amount, a contact forward force, and a contact shear force on a joint surface of the transmission according to the simulation result; and calculating a contact shear ratio according to the contact forward force and the contact shear force.
Other embodiments or specific implementation methods of the device for detecting oil leakage risk of a case closing surface of a transmission according to the present invention may refer to the above method embodiments, and will not be described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the background art in the form of a software product stored in an estimator readable storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as described above, comprising instructions for causing a smart device (which may be a mobile phone, estimator, transmission joint-face oil leakage risk detection device, or network transmission joint-face oil leakage risk detection device, etc.) to perform the method according to the embodiments of the present invention.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (9)
1. The transmission joint surface oil leakage risk detection method is characterized by comprising the following steps of:
constructing a finite element analysis model of a transmission shell according to parameter information of the transmission;
performing a simulation working condition test based on the finite element analysis model of the transmission shell to obtain a simulation result;
determining the contact opening amount and the contact shearing ratio on the joint box surface of the transmission according to the simulation result;
Judging whether oil leakage risks exist on the box closing surface according to the relation between the contact opening amount and the evaluation index of the normal opening amount and the relation between the contact shearing ratio and the evaluation index of the shearing direction stress ratio;
judging whether oil leakage risk exists on the box closing surface according to the relation between the contact opening amount and the evaluation index of the normal opening amount and the relation between the contact shearing ratio and the evaluation index of the shearing direction stress ratio, and comprising the following steps:
acquiring a first preset value corresponding to an evaluation index of the normal opening quantity and a second preset value corresponding to an evaluation index of the shearing direction stress ratio;
and when the contact shearing ratio is larger than the second preset value or the contact opening amount is larger than the first preset value and the contact shearing ratio is larger than the second preset value, judging that oil leakage risks exist on the box closing surface.
2. The method for detecting risk of oil leakage on a transmission joint-up surface according to claim 1, wherein the constructing a finite element analysis model of a transmission housing according to parameter information of the transmission comprises:
Acquiring parameter information of a transmission;
obtaining a transmission shell geometric model and material parameters corresponding to the transmission according to the parameter information;
and constructing a transmission shell finite element analysis model according to the transmission shell geometric model and the material parameters.
3. The transmission case-up face oil leakage risk detection method according to claim 2, wherein the constructing a transmission case finite element analysis model from the transmission case geometric model and the material parameters includes:
Performing finite element mesh division according to the geometric model of the transmission shell to obtain an initial finite element analysis model;
and adding material properties on the basis of the initial finite element analysis model according to the material parameters to obtain the finite element analysis model of the transmission shell.
4. A transmission joint-up face oil leakage risk detection method according to any one of claims 1 to 3, wherein the performing a simulation condition test based on the transmission case finite element analysis model to obtain a simulation result includes:
Performing contact treatment on a joint box surface in the finite element analysis model of the transmission shell to obtain a sealing performance simulation model;
And applying bolt pretightening force, bearing load force and suspension load force on the sealing performance simulation model to test simulation working conditions and obtain a simulation result.
5. The method for detecting risk of oil leakage on a joint compound surface of a transmission according to claim 4, wherein the applying of the bolt pretightening force, the bearing load force, and the suspension load force on the seal performance simulation model includes:
obtaining bolt parameters and pretightening force parameters according to the parameter information;
constructing an entity bolt model according to the bolt parameters and the pretightening force parameters;
applying bolt pretightening force on the sealing performance simulation model through the entity bolt model;
Bearing load force is applied to the bearing seat position of the sealing performance simulation model, and suspension load force is applied to the elastic center point of the suspension bracket of the sealing performance simulation model.
6. The method for detecting risk of oil leakage on a joint-in face of a transmission of claim 5, wherein the applying bearing load force at the bearing seat position of the sealing performance simulation model and applying suspension load force at the suspension bracket elastic center point of the sealing performance simulation model includes:
bearing load force is applied to the bearing seat position on the joint box surface of the sealing performance simulation model;
and applying a suspension load force to the elastic center point of the suspension bracket on the box body corresponding to the box assembling surface of the sealing performance simulation model.
7. A transmission joint-face oil leakage risk detection method according to any one of claims 1 to 3, wherein said determining the contact opening amount and the contact shearing ratio on the joint-face of the transmission from the simulation result includes:
Determining the contact opening amount, the contact forward force and the contact shearing force on the joint box surface of the transmission according to the simulation result;
and calculating a contact shear ratio according to the contact forward force and the contact shear force.
8. The utility model provides a derailleur joint close face oil leak risk detection device which characterized in that, derailleur joint close face oil leak risk detection device includes:
The model construction module is used for constructing a finite element analysis model of the transmission shell according to the parameter information of the transmission;
The simulation working condition module is used for carrying out simulation working condition test based on the finite element analysis model of the transmission shell to obtain a simulation result;
The result analysis module is used for determining the contact opening amount and the contact shearing ratio on the joint box surface of the transmission according to the simulation result;
The oil leakage detection module is used for judging whether oil leakage risks exist on the box closing surface according to the relation between the contact opening amount and the evaluation index of the normal opening amount and the relation between the contact shearing ratio and the evaluation index of the shearing direction stress ratio;
The oil leakage detection module is further used for obtaining a first preset value corresponding to the evaluation index of the normal opening quantity and a second preset value corresponding to the evaluation index of the shearing direction stress ratio; and when the contact shearing ratio is larger than the second preset value or the contact opening amount is larger than the first preset value and the contact shearing ratio is larger than the second preset value, judging that oil leakage risks exist on the box closing surface.
9. The utility model provides a derailleur joint close face oil leak risk check out test set which characterized in that, derailleur joint close face oil leak risk check out test set includes: a memory, a processor and a transmission joint-face oil leakage risk detection program stored on the memory and operable on the processor, which when executed by the processor implements the transmission joint-face oil leakage risk detection method according to any one of claims 1 to 7.
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