CN109190250B - Engine bearing bush parameter determination method - Google Patents
Engine bearing bush parameter determination method Download PDFInfo
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- CN109190250B CN109190250B CN201811020927.6A CN201811020927A CN109190250B CN 109190250 B CN109190250 B CN 109190250B CN 201811020927 A CN201811020927 A CN 201811020927A CN 109190250 B CN109190250 B CN 109190250B
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Abstract
The invention discloses a method for determining parameters of an engine bearing bush. The method comprises the following steps: acquiring related parameters of a shafting, and setting reference values of bearing bush parameters; establishing a crank shaft system dynamics model according to the related parameters of the shafting and the reference value of the bearing bush parameters; determining the worst working condition; adjusting the value range of the bearing bush parameter on the basis of the reference value of the bearing bush parameter so as to obtain the minimum friction loss work under the worst working condition; and outputting the value of the bearing bush parameter corresponding to the minimum friction loss work under the worst working condition if the minimum friction loss work under the worst working condition is smaller than or equal to a preset target value. The bearing bush parameters are designed by adopting the simulation method, so that the optimal bearing bush parameters can be obtained in the design process, and the situation that the bearing bush cannot meet the requirements after the complete machine design is finished is avoided.
Description
Technical Field
The embodiment of the invention relates to the technical field of engine design, in particular to a method for determining parameters of an engine bearing bush.
Background
The main bearing seat of engine is installed on the main bearing seat of engine body, and its action is to reduce friction resistance of journal and reduce abrasion of journal. When the engine works, the bearing bush bears the impact force transmitted by each moving part, so that adjacent parts are worn, and the bearing bush bears the maximum load. During the working process of the engine, the oil consumption of the whole vehicle can be increased due to friction loss work generated by friction between the bearing bush and other adjacent parts.
In the prior art, the whole engine test can be performed only after the production of a prototype is completed, and if the whole engine test is completed, the bearing bush design is found to be not up to the design target, the later optimization work of the bearing bush is quite passive.
Disclosure of Invention
The invention provides a method for determining engine bearing bush parameters so as to optimize the engine bearing bush parameters.
In a first aspect, an embodiment of the present invention provides a method for determining an engine bearing bush parameter, where the method includes:
acquiring related parameters of a shafting, and setting reference values of bearing bush parameters, wherein the bearing bush parameters comprise bearing bush width, bearing bush gap and oil supply pressure;
establishing a crank shaft system dynamics model according to the shafting related parameters and the reference value of the bearing bush parameters;
determining the worst working condition;
adjusting the value range of the bearing bush parameter on the basis of the reference value of the bearing bush parameter so as to obtain the minimum friction loss work under the worst working condition;
and outputting the value of the bearing bush parameter corresponding to the minimum friction loss work under the worst working condition if the minimum friction loss work under the worst working condition is smaller than or equal to a preset target value.
Further, the shafting-related parameters include at least one of an engine bore, a stroke, a cylinder pressure curve, a connecting rod group mass, a piston group mass, a damper parameter, a firing order, and a crankshaft material.
Further, the establishing a crank shaft dynamics model according to the shafting related parameter and the reference value of the bearing bush parameter comprises the following steps: and inputting the initial reference values of the shafting related parameters and the bearing bush parameters into computer aided engineering (Computer Aided Engineering, CAE) software, and establishing the crank shaft dynamics model by using the CAE software.
Further, the engine operating conditions include an idle operating condition, a rated speed operating condition, a maximum torque operating condition, and a maximum sustainable over-speed operating condition.
Further, different working conditions correspond to different boundary loads;
the determining the worst operating condition includes:
applying boundary loads corresponding to different working conditions to the crank system dynamics model respectively so as to calculate bearing bush specific pressure, minimum oil film thickness and engine oil temperature rise under each working condition;
and determining the worst working condition according to the bearing bush specific pressure, the minimum oil film thickness and the engine oil temperature rise.
Further, the determining the worst working condition according to the bearing bush specific pressure, the minimum oil film thickness and the engine oil temperature rise includes:
and taking the working conditions corresponding to the maximum value of the bearing bush specific pressure, the minimum value of the minimum oil film thickness and the maximum value of the engine oil temperature rise as the worst working conditions.
Further, the method for determining the engine bearing bush parameters further comprises the following steps:
if the minimum friction loss work under the worst working condition is larger than the preset target value, the value range of the bearing bush parameter is adjusted again on the basis of the reference value of the bearing bush parameter;
and acquiring the minimum friction loss work under the worst working condition again according to the adjusted value range of the bearing bush parameter.
Further, the readjusting the value range of the bearing bush parameter based on the reference value of the bearing bush parameter includes:
performing at least one of the following operations: and adjusting the value range of the width of the bearing bush, the value range of the gap of the bearing bush and the value range of the oil supply pressure.
Further, the adjusting the value range of the bearing bush width includes: maintaining the reference value of the width of the bearing bush, and adjusting the upper limit of the width of the bearing bush and the lower limit of the width of the bearing bush;
the adjusting of the value range of the bearing bush gap comprises the following steps: maintaining the reference value of the bearing bush gap, and adjusting the upper limit of the bearing bush gap and the lower limit of the bearing bush gap;
adjusting the range of values of the oil supply pressure includes: maintaining the reference value of the oil supply pressure, and adjusting the upper limit of the oil supply pressure and the lower limit of the oil supply pressure.
Further, the upper limit of the bearing bush width is 1.1 times of the reference value of the bearing bush width, and the lower limit of the bearing bush width is 0.9 times of the reference value of the bearing bush width;
the upper limit of the bearing bush gap is 1.1 times of the reference value of the bearing bush gap, and the lower limit of the bearing bush gap is 0.9 times of the reference value of the bearing bush gap;
the upper limit of the oil supply pressure is 1.1 times the reference value of the oil supply pressure, and the lower limit of the oil supply pressure is 0.9 times the reference value of the oil supply pressure.
When the bearing bush parameter is designed, a set of reference values of the bearing bush parameter are set, a curved shafting dynamic model is built according to the shafting related parameter and the reference values of the bearing bush parameter, worst working conditions are determined, values of the bearing bush parameter are adjusted near the reference values, and the bearing bush parameter with minimum friction loss work as a target is screened out when the friction loss work is minimum; because the bearing bush parameters are designed by adopting the computer simulation method, the optimal bearing bush parameters can be set in the process of designing the engine, and the situation that the bearing bush cannot meet the requirements after the complete machine design of the engine is completed can be avoided.
Drawings
FIG. 1 is a flowchart of a method for determining engine bearing bush parameters according to an embodiment of the present invention;
FIG. 2 is a flow chart for determining worst operating conditions provided by an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Fig. 1 is a flowchart of a method for determining engine bearing bush parameters according to an embodiment of the present invention. Optionally, referring to fig. 1, the method includes:
and 10, acquiring related parameters of a shafting, and setting reference values of bearing bush parameters, wherein the bearing bush parameters comprise bearing bush width, bearing bush gap and oil supply pressure.
Specifically, the shafting related parameters are related to the model of the engine, and can be determined according to the design requirements, performance and the like of the engine; wherein the bearing bush parameter also belongs to a part of the related parameters of the shafting. To ensure reliability of engine performance, all shafting-related parameters associated with the engine bearing shell need to be considered. It is particularly emphasized that, although the present invention is designed for the bearing shell of an engine, it is still necessary to set a set of reference values for the bearing shell parameters in order to ensure the integrity of the shafting-related parameters; in the subsequent design process, the reference value of the bearing bush parameter can be optimized and improved according to a certain method. Since the widths of the bearing bushes of the engines of different types may differ greatly, when the reference value of the bearing bush parameter is set, the type of the engine closest to the design purpose of the present solution may be referred to, and the bearing bush parameter of the engine of the type is used as the reference value of the bearing bush parameter in the present embodiment, and the reference value of the bearing bush width may also be set according to experience of a designer. Similarly, the setting of the reference values for the bearing shell clearance and the oil supply pressure may also be set with reference to the design principles described above. It should be noted that, the setting of the reference value of the bearing bush parameter includes, but is not limited to, the above type.
And 20, establishing a crank shaft system dynamics model according to the related parameters of the shafting and the reference value of the bearing bush parameters.
Specifically, in the embodiment, the design of the engine bearing bush is performed by adopting a simulation method, and when the design is performed, a corresponding dynamics model is preferably set up according to parameters related to the engine, and the model can comprise a model of the whole engine or only a local structure of the engine possibly related to the design of the bearing bush, which is not particularly limited in the embodiment.
And 30, determining the worst working condition.
Specifically, each engine comprises multiple working conditions, and in order to enable the bearing bush to meet the working requirements of the engine under any working condition, the worst working condition can be selected as a designed reference working condition. It will be appreciated that if the bearing shell is capable of meeting the operational requirements of the engine under the worst operating conditions, the bearing shell may be considered to be capable of meeting the operational requirements of the engine under any operating conditions. Further, the worst operating condition of the engine may be determined by a variety of different methods, which is not particularly limited in this embodiment.
And step 40, adjusting the value range of the bearing bush parameter on the basis of the reference value of the bearing bush parameter so as to obtain the minimum friction loss work under the worst working condition.
After the worst working condition is determined, the value range of the bearing bush parameter can be adjusted on the basis of the reference value of the bearing bush parameter, and when the value of the bearing bush parameter is adjusted, the value of the bearing bush parameter can be adjusted in a certain range near the reference value of the bearing bush parameter, and the bearing bush parameter in the certain value range is analyzed by using calculation software so as to find the optimal solution of the value of the bearing bush parameter. When the optimal solution of the bearing bush parameters is obtained, the minimum friction loss work can be used as a judgment basis. The minimum friction loss work is the friction loss generated by the relative motion between the crankshaft journal and the bearing bush when the engine runs, the friction can impact the bearing bush, abrade the adjacent parts of the bearing bush, and aggravate the load of the engine, so that the oil consumption of the whole engine is increased, and therefore, the obtained bearing bush parameter is beneficial to improving the performance of the whole engine when the friction loss work is smaller.
And 50, outputting a value of a bearing bush parameter corresponding to the minimum friction loss work under the worst working condition if the minimum friction loss work under the worst working condition is smaller than or equal to a preset target value.
In particular, since the friction loss work between the crank journal and the bearing shell cannot disappear, the minimum friction loss work can only be reduced as much as possible in the engine design. For each engine, the designer has a preset target value of the expected friction loss work of the engine, and if the calculated minimum friction loss function is smaller than or equal to the preset target value, the design of the bearing bush meets the requirements of the designer, and the design of the surface bearing bush parameters meets the requirements of the engine.
When the bearing bush parameter is designed, a set of reference values of the bearing bush parameter are set, a crankshaft system dynamics model is built according to the related parameters of the shafting and the reference values of the bearing bush parameter, worst working conditions are determined, values of the bearing bush parameter are adjusted near the reference values, and the values of the bearing bush parameter when the friction loss work is minimum are screened out by taking the minimum friction loss work as a target; because the bearing bush parameters are designed by adopting the computer simulation method, the optimal bearing bush parameters can be set in the process of designing the engine, and the situation that the bearing bush cannot meet the requirements after the complete machine design of the engine is completed can be avoided.
Alternatively, the shafting-related parameters may include at least one of an engine bore, a stroke, a cylinder pressure curve, a rod set mass, a piston set mass, a damper parameter, a firing order, and a crankshaft material. Specifically, to obtain reliable bearing shell parameters, all factors that may affect the bearing shell parameters need to be considered when building the crankshaft dynamics model, and the above engine bore, stroke, cylinder pressure curve, linkage mass, piston group mass, damper parameters, firing order, and crankshaft materials all affect the friction between the crankshaft journal and the bearing shell. It will be appreciated that in establishing the crankshaft dynamics mode, more factors that may affect friction between the crankshaft journal and the bearing shell may also be considered to further improve the accuracy of the model's optimization of the bearing shell parameters.
Optionally, establishing the crank shaft dynamics model according to the reference value of the shafting related parameter and the bearing bush parameter comprises: and inputting the reference values of the related parameters of the shafting and the bearing bush parameters into Computer Aided Engineering (CAE) software, and establishing a crank system dynamics model by using the CAE software. Specifically, the CAE software is important engineering design software, models of various devices such as an engine and the like of various products can be built by inputting information parameters of the products, and the operation and the use of the products can be truly and effectively simulated by using a computer, so that the important parameters of the products can be obtained through analysis, and the quality of the products can be improved in an auxiliary manner. Alternatively, other existing or future software may be selected when the crankshaft dynamics model is established, which is not particularly limited in this embodiment.
Alternatively, the operating conditions of the engine may include an idle operating condition, a rated speed operating condition, a maximum torque operating condition, and a maximum sustainable over-speed operating condition. Specifically, the idle speed working condition indicates that the engine is in a standby state, and is a working condition that the engine is operated when no load is applied; the rated rotation speed working condition is the most common working condition of the engine; the maximum torque working condition represents the corresponding working condition of the engine when the maximum power is output; the maximum sustainable over-speed condition represents a condition when the engine is operating at the highest speed. The four conditions include most of the conditions that may occur during operation of the engine. In other words, as long as the bearing bush provided in the embodiment can ensure the normal operation of the engine under the four working conditions, the bearing bush can basically be considered to meet the working requirements of the engine under any working condition.
FIG. 2 is a flow chart for determining worst operating conditions provided by an embodiment of the present invention. Optionally, different conditions correspond to different boundary loads; different working conditions of the engine can be simulated by applying different boundary loads to the crank dynamic model. Referring to fig. 2, determining the worst operating condition includes:
and 31, respectively applying boundary loads corresponding to different working conditions to the crank system dynamics model to calculate bearing bush specific pressure, minimum oil film thickness and engine oil temperature rise under each working condition.
Specifically, in the working process of the engine, each working condition corresponds to one boundary load, and different working conditions of the engine can be obtained through simulation by applying different boundary loads to the crank system dynamics model. And each time a boundary load is applied to the crank dynamics model, the crank dynamics model can correspond to a working condition, and accordingly, the bearing bush specific pressure, the minimum oil film thickness and the engine oil temperature rise under the working condition can be calculated. The specific bearing bush pressure, the minimum oil film thickness and the engine oil temperature rise are parameters used for representing the working limit of the engine, and when the values of the specific bearing bush pressure, the minimum oil film thickness and the engine oil temperature rise are closer to the extreme values, the working state of the engine is represented to be closer to the limit.
And step 32, determining the worst working condition according to the bearing bush specific pressure, the minimum oil film thickness and the engine oil temperature rise.
Specifically, after the values of the bearing bush specific pressure, the minimum oil film thickness, and the oil temperature rise are obtained, the worst working condition may be determined by analyzing the values of the bearing bush specific pressure, the minimum oil film thickness, and the oil temperature rise, and the determination method thereof will be explained in the following examples.
It should be noted that, the method for determining the worst operating condition provided in this embodiment includes, but is not limited to, the method described above, and is exemplarily easier to be the worst operating condition of the engine than the idle operating condition and the maximum sustainable over-rotation operating condition, so when determining the worst operating condition, the method may also be according to experience of a designer, etc.
Optionally, determining the worst working condition according to the bearing bush specific pressure, the minimum oil film thickness and the engine oil temperature rise includes: and taking the working conditions corresponding to the maximum value of the bearing bush specific pressure, the minimum value of the minimum oil film thickness and the maximum value of the engine oil temperature rise as worst working conditions. Specifically, the larger the bearing bush specific pressure and the engine oil temperature rise are, the worse the working condition of the engine is usually indicated, and the worse the corresponding working condition of the engine is when the minimum oil film thickness is smaller. It should be noted that, in general, in the above four working conditions, after determining that one of the working conditions is the worst working condition, the values of the specific pressure of the bearing bush and the temperature rise of the engine oil are always larger than those of the other three working conditions, and meanwhile, the minimum oil film thickness is always smaller than those of the other three working conditions. Alternatively, the bearing specific pressure, the minimum oil film thickness, and the oil temperature rise may also be collectively referred to as constraints.
Optionally, the method for determining the engine bearing bush parameter provided in this embodiment further includes: if the minimum friction loss work under the worst working condition is larger than a preset target value, the value range of the bearing bush parameter is adjusted again on the basis of the reference value of the bearing bush parameter; and acquiring the minimum friction loss work under the worst working condition again according to the value range of the adjusted bearing bush parameters. Specifically, after constraint conditions are obtained according to reference values of bearing bush parameters, when the minimum friction loss work corresponding to the worst working condition is obtained, the value range of the bearing bush parameters needs to be adjusted; however, in general, when the value of the bearing bush parameter is first adjusted based on the reference value of the bearing bush parameter, the value of the bearing bush parameter is generally not adjusted to a too large value range, because the reference value of the bearing bush parameter is often relatively close to the value of the bearing bush parameter in the existing engine. Although the existing bearing bush parameters may have certain defects in the aspect of friction loss work of the bearing bush, the existing bearing bush parameters can ensure the stability of the overall performance of the engine as far as the engine is concerned. If the bearing bush parameter is adjusted to be far from the reference value, although the friction work between the crank journal and the bearing bush can be reduced, the stability of the overall performance of the engine may be negatively affected.
Optionally, readjusting the value range of the bearing bush parameter in the crank system dynamics model based on the reference value of the bearing bush parameter includes: performing at least one of the following operations: and adjusting the value range of the width of the bearing bush, the value range of the gap of the bearing bush and the value range of the oil supply pressure. Specifically, when the bearing bush parameters are adjusted again, only one, two or three of the bearing bush width, the bearing bush gap and the oil supply pressure can be adjusted according to actual requirements. It can be understood that, because the adjustment range is often smaller when the values of the bearing bush width, the bearing bush gap and the oil supply pressure are adjusted on the basis of the reference value for the first time, when the values of the bearing bush width, the bearing bush gap and the oil supply pressure need to be adjusted again, the value ranges of the bearing bush width, the bearing bush gap and the oil supply pressure can be adjusted in a relatively larger range. It should be noted that, in the simulation calculation, the expected preset target value may not be obtained within a certain range around the reference value of the bearing bush parameter. The design of the bearing shell parameters may be very flexible, for example, by again expanding the floating range of the bearing shell parameters around their reference values, or by modifying the desired target values appropriately so that they can be matched to the minimum friction loss work obtained by the simulation calculation.
Optionally, adjusting the value range of the bearing bush width includes: maintaining a reference value of the width of the bearing bush, and adjusting the upper limit of the width of the bearing bush and the lower limit of the width of the bearing bush; the adjusting range of the bearing bush gap comprises the following steps: maintaining a reference value of the bearing bush gap, and adjusting the upper limit of the bearing bush gap and the lower limit of the bearing bush gap; the adjusting range of the oil supply pressure includes: the reference value of the oil supply pressure is maintained, and the upper limit of the oil supply pressure and the lower limit of the oil supply pressure are adjusted. Specifically, if the bearing bush width needs to be adjusted for multiple times, the reference value of the bearing bush width is kept unchanged during each adjustment, and adjustment of the upper limit and the lower limit is performed to a certain extent on the basis of the reference value. It can be understood that the main purpose of keeping the reference value unchanged is to find the bearing bush parameter when the friction loss work is minimum near the reference value, so that the bearing bush parameter can be not deviated from the value of the existing bearing bush parameter as much as possible while the bearing bush parameter is optimized, and the stability of the overall performance of the engine is maintained.
Optionally, the upper limit of the bearing bush width is 1.1 times of the reference value of the bearing bush width, and the lower limit of the bearing bush width is 0.9 times of the reference value of the bearing bush width; the upper limit of the bearing bush gap is 1.1 times of the reference value of the bearing bush gap, and the lower limit of the bearing bush gap is 0.9 times of the reference value of the bearing bush gap; the upper limit of the oil supply pressure is 1.1 times the reference value of the oil supply pressure, and the lower limit of the oil supply pressure is 0.9 times the reference value of the oil supply pressure. Alternatively, in order to keep the overall performance of the engine stable, the values of the bearing bush width, the bearing bush clearance and the oil supply pressure may not exceed 10% of the upper limit and 10% of the lower limit of the values of the reference value. If 10% of the upper limit and 10% of the lower limit of the reference value of the bearing bush parameter do not find the friction loss work satisfying the preset target value, a value range for properly increasing the minimum friction loss work can be selected. Optionally, in practical applications, the final values of the bearing shell parameters include, but are not limited to, the upper limit and the lower limit of the reference values of the bearing shell parameters.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (9)
1. The method for determining the parameters of the engine bearing bush is characterized by comprising the following steps of:
acquiring related parameters of a shafting, and setting reference values of bearing bush parameters, wherein the bearing bush parameters comprise bearing bush width, bearing bush gap and oil supply pressure;
establishing a crank shaft system dynamics model according to the shafting related parameters and the reference value of the bearing bush parameters;
the step of establishing a crank shaft system dynamics model according to the shafting related parameters and the reference value of the bearing bush parameters comprises the following steps:
inputting the reference values of the related shafting parameters and the bearing bush parameters into Computer Aided Engineering (CAE) software, and establishing a crank system dynamics model by utilizing the CAE software;
determining the worst working condition;
the determining the worst operating condition includes:
applying boundary loads corresponding to different working conditions to the crank system dynamics model respectively so as to calculate bearing bush specific pressure, minimum oil film thickness and engine oil temperature rise under each working condition;
determining the worst working condition according to the bearing bush specific pressure, the minimum oil film thickness and the engine oil temperature rise;
adjusting the value range of the bearing bush parameter on the basis of the reference value of the bearing bush parameter so as to obtain the minimum friction loss work under the worst working condition;
and outputting the value of the bearing bush parameter corresponding to the minimum friction loss work under the worst working condition if the minimum friction loss work under the worst working condition is smaller than or equal to a preset target value.
2. The method for determining the parameters of the engine bushing according to claim 1, wherein,
the shafting-related parameters include at least one of an engine bore, a stroke, a cylinder pressure curve, a connecting rod group mass, a piston group mass, a damper parameter, a firing order, and a crankshaft material.
3. The method of claim 1, wherein the engine operating conditions include an idle operating condition, a rated speed operating condition, a maximum torque operating condition, and a maximum sustainable over-speed operating condition.
4. A method for determining engine bushing parameters according to claim 3, wherein,
different conditions correspond to different boundary loads.
5. The method for determining the parameters of the engine bushing according to claim 1, wherein,
the determining the worst working condition according to the bearing bush specific pressure, the minimum oil film thickness and the engine oil temperature rise comprises the following steps:
and taking the working conditions corresponding to the maximum value of the bearing bush specific pressure, the minimum value of the minimum oil film thickness and the maximum value of the engine oil temperature rise as the worst working conditions.
6. The engine bushing parameter determination method of claim 1, further comprising:
if the minimum friction loss work under the worst working condition is larger than the preset target value, the value range of the bearing bush parameter is adjusted again on the basis of the reference value of the bearing bush parameter;
and acquiring the minimum friction loss work under the worst working condition again according to the adjusted value range of the bearing bush parameter.
7. The method for determining the parameters of the engine bushing according to claim 6, wherein,
the re-adjusting the value range of the bearing bush parameter based on the reference value of the bearing bush parameter comprises the following steps:
performing at least one of the following operations: and adjusting the value range of the width of the bearing bush, the value range of the gap of the bearing bush and the value range of the oil supply pressure.
8. The method for determining the parameters of the engine bushing according to claim 7, wherein,
the adjusting the value range of the width of the bearing bush comprises the following steps: maintaining the reference value of the width of the bearing bush, and adjusting the upper limit of the width of the bearing bush and the lower limit of the width of the bearing bush;
the adjusting of the value range of the bearing bush gap comprises the following steps: maintaining a reference value of the bearing bush gap, and adjusting the upper limit of the bearing bush gap and the lower limit of the bearing bush gap;
adjusting the range of values of the oil supply pressure includes: maintaining the reference value of the oil supply pressure, and adjusting an upper limit of the oil supply pressure and a lower limit of the oil supply pressure.
9. The method for determining the parameters of the engine bushing according to claim 8, wherein,
the upper limit of the bearing bush width is 1.1 times of the reference value of the bearing bush width, and the lower limit of the bearing bush width is 0.9 times of the reference value of the bearing bush width;
the upper limit of the bearing bush gap is 1.1 times of the reference value of the bearing bush gap, and the lower limit of the bearing bush gap is 0.9 times of the reference value of the bearing bush gap;
the upper limit of the oil supply pressure is 1.1 times the reference value of the oil supply pressure, and the lower limit of the oil supply pressure is 0.9 times the reference value of the oil supply pressure.
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