CN112460241A - Design method for inhibiting oil mixing power loss of transmission system - Google Patents

Design method for inhibiting oil mixing power loss of transmission system Download PDF

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CN112460241A
CN112460241A CN202011052438.6A CN202011052438A CN112460241A CN 112460241 A CN112460241 A CN 112460241A CN 202011052438 A CN202011052438 A CN 202011052438A CN 112460241 A CN112460241 A CN 112460241A
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oil
power loss
sealing ring
formula
liquid
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CN112460241B (en
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李春明
徐宜
张金乐
卜树峰
张喜明
乔丽
李明勇
陈嘉杨
宋美球
魏然
柳泓蛰
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China North Vehicle Research Institute
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0409—Features relating to lubrication or cooling or heating characterised by the problem to increase efficiency, e.g. by reducing splash losses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H41/00—Rotary fluid gearing of the hydrokinetic type
    • F16H41/04—Combined pump-turbine units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H41/00—Rotary fluid gearing of the hydrokinetic type
    • F16H41/24—Details
    • F16H41/30—Details relating to venting, lubrication, cooling, circulation of the cooling medium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/08—General details of gearing of gearings with members having orbital motion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/08—General details of gearing of gearings with members having orbital motion
    • F16H2057/087—Arrangement and support of friction devices in planetary gearings, e.g. support of clutch drums, stacked arrangements of friction devices

Abstract

The invention discloses a design method for inhibiting oil stirring power loss of a transmission system, which comprises the following steps: step 1, obtaining the oil mixing power loss of each component in the comprehensive transmission system at different rotating speeds through an oil mixing power loss test, and selecting more than two components which are arranged at the front in the oil mixing power loss of the comprehensive transmission system from large to small for power suppression; the selected components are a planetary speed change mechanism and a hydraulic element, wherein the hydraulic element comprises a steering hydraulic coupler and a hydraulic retarder; and 2, inhibiting the oil stirring power loss of the member selected in the step 1, wherein the inhibiting method comprises the following steps: the minimum distance between the parts with the maximum speed difference in the planetary speed change mechanism is increased, the leakage loss of a liquid filling control valve of a hydraulic element is reduced, and a sealing ring material with a small friction coefficient is adopted. The invention can realize the oil mixing power loss inhibition of the comprehensive transmission system which is changed from one dimension to multiple dimensions and expanded from point to domain, and is beneficial to improving the design level of the vehicle running performance and the fuel economy.

Description

Design method for inhibiting oil mixing power loss of transmission system
Technical Field
The invention belongs to the technical field of tracked vehicles, and particularly relates to a design method for inhibiting oil mixing power loss of a transmission system.
Background
The oil stirring power loss of the comprehensive transmission system is an important factor for restricting the improvement of the transmission efficiency, the no-load oil stirring power loss is large, the heat productivity of the system is inevitably large, the burden of a matched cooling auxiliary system is large, the overall efficiency and performance index of the transmission system are difficult to improve, and the overall efficiency, the economy and the reliability of the whole vehicle are directly influenced. Therefore, the oil stirring power loss value of the comprehensive transmission system has important influence on the fuel economy of the vehicle, and the method is important for designing and checking the comprehensive transmission system.
The comprehensive transmission system integrates mechanical, electronic, hydraulic and other components, is complex in structural composition, and mutually couples working boundary conditions for constructing oil mixing power loss, so that a scientific design method for calculating the oil mixing power loss in a system level is lacked in the industry at present.
Disclosure of Invention
In view of the above, the invention provides a design method for suppressing oil mixing power loss of a transmission system, which can realize the oil mixing power loss suppression of the comprehensive transmission system by converting from one dimension to multiple dimensions and expanding from a point to a domain, and is beneficial to improving the design level of the vehicle driving performance and the fuel economy.
The invention is realized by the following technical scheme:
a design method for inhibiting oil stirring power loss of a transmission system comprises the following specific steps:
step 1, obtaining the oil mixing power loss of each component in the comprehensive transmission system at different rotating speeds through an oil mixing power loss test, and selecting more than two components which are arranged at the front in the oil mixing power loss of the comprehensive transmission system from large to small for power suppression; the selected components are a planetary speed change mechanism and a hydraulic element, wherein the hydraulic element comprises a steering hydraulic coupler and a hydraulic retarder;
and 2, inhibiting the oil stirring power loss of the member selected in the step 1, wherein the inhibiting method comprises the following steps: the minimum distance between the parts with the maximum speed difference in the planetary speed change mechanism is increased, the leakage loss of a liquid filling control valve of a hydraulic element is reduced, and a sealing ring material with a small friction coefficient is adopted.
Further, polyimide is adopted as the material of the sealing ring.
Further, the relationship between the minimum distance between the parts with the maximum speed difference in the selected component and the oil churning power loss in the step 2 is calculated as follows:
under the no-load working condition of the comprehensive transmission system, lubricating oil flows out of each lubricating point in the planetary speed change mechanism, and is in an inertial flow state under the rotation action of a lubricating part; the lubricating oil is mixed with air in a box body of the planetary speed change mechanism to form a gas-liquid two-phase flow state, and a flow field of the gas-liquid two-phase flow is a non-uniformly distributed flow field; the distribution of the lubricating oil changes along with the change of the distance between the rotating center of the transmission shaft system and the inner wall of the box body;
the method comprises the following steps of firstly, establishing a gas-liquid two-phase mixed flow field model by taking the rotation center of a transmission shaft system and the inner wall of a box body as reference standards:
the lubricating oil is set to be diffused to the circumferential direction under the action of centrifugal force, so that the fluid density of the gas-liquid two-phase mixed flow field is as follows:
Figure BDA0002709972330000021
in the formula, ρ0Fluid density, rho, of a gas-liquid two-phase mixed flow fieldairIs the air density, poilThe density of the lubricating oil is shown, x is the distance from any point of the lubricating oil in the gas-liquid two-phase mixed flow field to the wall surface of the lubricating part, and v is the linear velocity of the wall surface of the lubricating part;
therefore, it is known that the distribution of the lubricating oil in the gas-liquid two-phase mixed flow field is related to the distance from the wall surface of the lubricating part and the linear velocity of the wall surface of the lubricating part, and as the linear velocity of the wall surface of the lubricating part increases, the closer to the wall surface of the lubricating part, the less the distribution of the lubricating oil;
secondly, in an actual working condition, because the gas-liquid two-phase mixed flow field is positioned in a closed environment in the planetary speed change mechanism, the two sides of the gas-liquid two-phase mixed flow field are respectively the wall surfaces of two lubricating parts in the planetary speed change mechanism; therefore, the three-dimensional flow space of the gas-liquid two-phase mixed flow field is simplified into two-dimensional fluid distribution between the wall surfaces of two lubricating parts, and the calculation formula of the fluid density of the gas-liquid two-phase mixed flow field in the formula (1) is converted into:
Figure BDA0002709972330000022
in the formula, v1、v2Linear velocity, x, of the walls of two lubricated parts, respectively1、x2Respectively the distance between any point of lubricating oil in the gas-liquid two-phase mixed flow field and the wall surfaces of the two lubricating parts;
order to
Figure BDA0002709972330000023
Then equation (2) translates to:
Figure BDA0002709972330000024
obtaining the fluid viscosity mu of the gas-liquid two-phase mixed flow field according to the similarity of the fluid viscosity and the physical properties of the fluid density0The calculation model is:
Figure BDA0002709972330000031
in the formula, muairIs air viscosity, μoilIs the viscosity of the lubricating oil;
selecting any one of the two lubricating parts as a research object, and establishing a resistance model for the frictional resistance between the wall surface of the selected lubricating part and the fluid of the gas-liquid two-phase mixed flow field by a flat boundary layer calculation method; the frictional resistance F is:
Figure BDA0002709972330000032
wherein, CfFor the fluid frictional resistance, the expression is:
Figure BDA0002709972330000033
wherein Re is a Reynolds number, v0The linear velocity of the fluid of the gas-liquid two-phase mixed flow field relative to the selected lubricating part is defined as B, the contact width of the wall surface of the selected lubricating part and the fluid of the gas-liquid two-phase mixed flow field is defined as B, and the contact length of the wall surface of the selected lubricating part and the fluid of the gas-liquid two-phase mixed flow field is defined as L.
Fourthly, according to a formula (6), obtaining the oil stirring power loss P of the lubricated parts selected in the third step1，P1The expression of (a) is as follows:
P1＝Fv0formula (7)
According to the formula (7), under the no-load working condition, the oil stirring power loss of the lubricating part selected in the third step is related to the frictional resistance F, and further related to the fluid density rho of the gas-liquid two-phase mixed flow field0With respect to the distance between two lubricated parts; the smaller the distance between the two lubricated parts is, the greater the oil stirring power loss of the lubricated parts is.
Further, the calculation process of the relationship between the leakage loss of the liquid filling control valve of the hydraulic element and the oil stirring power loss in the step 2 is as follows:
the liquid filling control valve leaks, and oil enters the hydraulic element and is mixed with air in the hydraulic element to form a gas-liquid two-phase mixed flow field; at this time, the hydraulic element is in an oil-filled state;
oil mixing power loss P of hydraulic element in oil-filled state2The calculation formula of (a) is as follows:
P2＝ρ0'gλn3D5formula (8)
In the formula, ρ0The two impellers of the hydraulic element are respectively a fixed wheel and a movable wheel of a hydraulic speed reducer or a pump wheel and a turbine of a hydraulic coupler; d is the effective duty cycle circle diameter, and λ is the torque coefficient, which can be obtained from the oil churning power loss of Table 1, and the expression for λ is as follows:
Figure BDA0002709972330000041
in the formula, nBThe pump wheel speed of the fluid coupling or the fixed wheel speed of the fluid retarder, nTThe rotational speed of a turbine of the hydraulic coupler or the rotational speed of a driving wheel of the hydraulic retarder; if n isB≠0,
Figure BDA0002709972330000042
If n isB0, λ is constant;
let δ be ρ0'gλD5Then, equation (8) is changed to:
P2＝δn3formula (10)
According to the formula (10), the oil churning power loss of the hydraulic element in the oil-filled state is related to the relative rotating speed between the impellers, namely the oil churning power loss of the hydraulic speed reducer is related to the relative rotating speed between the movable wheel and the fixed wheel, and the oil churning power loss of the hydraulic coupler is related to the relative rotating speed between the pump wheel and the turbine wheel; the less oil leakage of the liquid filling control valve, the smaller the relative rotating speed between the impellers, and the smaller the oil stirring power loss.
Further, the calculation process of the relationship between the friction coefficient of the sealing ring material and the oil stirring power loss in the step 2 is as follows:
firstly, analyzing motion law influence factors, namely calculating the oil stirring power loss between two binding surfaces with relative motion in a relative high-speed motion space according to a motion state;
the rotary seal structure includes: the rotary shaft, the oil distribution sleeve and the sealing ring; an annular groove is processed on the outer circumferential surface of the rotating shaft; the sealing ring is arranged in the annular groove; the oil distribution sleeve is sleeved outside the rotating shaft, and a gap is reserved between the inner circumferential surface of the oil distribution sleeve and the outer circumferential surface of the rotating shaft; the outer circumferential surface of the sealing ring is an AB surface, the inner circumferential surface of the sealing ring is a CD surface, and the two end surfaces of the sealing ring are respectively an AD surface and a CB surface; wherein, the AB surface of the sealing ring is in contact with the inner circumferential surface of the oil distribution sleeve; the BC surface of the sealing ring is in fit contact with the wall surface of the annular groove on the rotating shaft; the sealing oil of the comprehensive transmission system is filled in the annular groove on the rotating shaft, and the oil pressure of the sealing oil is p0Under the action of the pressure of the sealing oil, frictional resistance F is generated between the AB surface of the sealing ring and the inner circumferential surface of the oil distribution sleeveABFrictional resistance F is generated between the CB surface of the seal ring and the wall surface of the annular groove of the rotary shaftCB；
When F is presentCB>FABWhen the oil stirring device is used, the sealing ring and the rotating shaft rotate together, and the oil stirring power loss comes from frictional resistance FAB；
FAB＝p02πr1Hf1Formula (11)
In the formula, r1Is the outer diameter of the seal ring, H is the axial length of the seal ring, f1The friction coefficient between the sealing ring and the oil distribution sleeve is defined as the friction coefficient;
when F is presentCB<FABWhen the oil mixing machine is used, the sealing ring and the oil distribution sleeve rotate together, and the oil mixing power loss comes from frictional resistance FCB；
Figure BDA0002709972330000051
In the formula, r1Is the outer diameter of the sealing ring, r2The inner diameter of the seal ring is delta is the clearance between the outer circumferential surface of the rotating shaft and the inner circumferential surface of the oil distribution sleeve, f2The coefficient of friction between the sealing ring and the wall surface of the annular groove of the rotating shaft;
when F is presentCB＝FABWhen the sealing ring rotates along with the rotating shaft, the oil stirring power loss comes from frictional resistance FAB(ii) a When the sealing ring rotates along with the oil distribution sleeve, the oil stirring power loss comes from frictional resistance FCB；
Judging the motion state of the seal ring according to the motion coefficient sigma, wherein the motion coefficient sigma is expressed as follows:
Figure BDA0002709972330000052
according to the formula (13), since the machining accuracy of the rotary shaft and the oil distribution sleeve is the same, the friction coefficient f1＝f2The motion coefficient sigma is only related to the geometric dimension and the fit clearance of the sealing ring, the geometric dimension and the fit clearance of the sealing ring are substituted into a formula (13), sigma is calculated, and the calculation result shows that the sigma is far less than 1, so that the sealing ring and the oil distribution sleeve are judged to rotate together, and the power loss of the sealing ring comes from the frictional resistance FCB；
Second step of carrying outAnalysis of the frictional resistance influencing factors, i.e. determination of the coefficient of friction f in equation (12) by experiment2；
The formula (12) deduces the expression of the friction torque M applied to the sealing ring as follows:
Figure BDA0002709972330000053
wherein D is frictional resistance FCBThe value of the friction torque M can be obtained by tests, which are: selecting more than two sealing ring samples with the same geometric dimension but different materials, performing a contrast test, and obtaining the friction torque M borne by the sealing ring through a torquemeter test in the test process;
the friction coefficient f can be obtained by substituting the test result, i.e., the value of the friction torque M, into the formula (14)2The change rule of the friction coefficient change and the friction torque of the sealing rings made of different materials is obtained according to the change trend as follows:
Figure BDA0002709972330000054
thirdly, calculating the oil stirring power loss P of the sealing ring according to the formula (15)3The expression is as follows:
Figure BDA0002709972330000055
in the formula, n is the rotating speed of the rotating shaft;
according to the formula (16), the oil churning power loss of the sealing ring is related to the friction coefficient of the material, and the smaller the friction coefficient of the material of the sealing ring is, the smaller the oil churning power loss is.
Has the advantages that:
1. the invention provides a design method for inhibiting the oil stirring power loss of a comprehensive transmission system from one dimension to multi-dimension conversion and from point to domain expansion for components with larger proportion in the oil stirring power loss in the comprehensive transmission system, namely a planetary speed change mechanism and a hydraulic element.
2. In the design of a comprehensive transmission system, the oil mixing power loss inhibition is realized by three multi-dimensional design methods, namely (1) the minimum distance between two lubrication parts with the maximum speed difference is increased; (2) the leakage of a liquid filling control valve of the hydraulic element is reduced; (3) a sealing ring material (polyimide) with a small friction coefficient is adopted; the invention inhibits the oil mixing power loss of internal components of the transmission system from multiple dimensions, and specifically adopts measures to inhibit the oil mixing power loss, thereby effectively improving the system efficiency and improving the economic performance of vehicle fuel.
3. The method adopts a calculation model of the oil mixing power loss of the comprehensive transmission system and a test verification result as a basis, is not only applied to the comprehensive transmission system, but also provides a reference for a design method for inhibiting the oil mixing power loss of the transmission system with different modes.
Drawings
FIG. 1 is a proportional relationship of no-load losses of various components in an integrated transmission system;
FIG. 2 is a lubricating oil density distribution within a flow field of a two-phase gas-liquid flow;
FIG. 3 is a relationship between oil churning power loss and distance between two lubricated parts;
FIG. 4 is a schematic view of the sealing ring under force.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The embodiment provides a design method for inhibiting oil stirring power loss of a transmission system, which comprises the following specific steps:
step 1, selecting components according to the oil mixing power loss ratio, namely obtaining the oil mixing power loss of each component in the comprehensive transmission system at different rotating speeds through an oil mixing power loss test, and selecting more than two components with the ratio ranked from large to small in the oil mixing power loss of the comprehensive transmission system for power suppression;
wherein the oil stirring power loss of the integrated transmission system comprises: the power required by the hydraulic system for supplying lubricating oil, operating oil and compensating oil to the system, the power lost by the meshing and oil stirring of a gear shafting, the power lost by a friction element, and the power lost by the friction of a sealing element and a hydraulic element;
the process of the oil stirring power loss test of the comprehensive transmission system is as follows:
because the rotating speed of each component of the comprehensive transmission system under the highest gear is highest, the no-load test working condition when the input rotating speeds of the comprehensive transmission system under the highest gear are 1800r/min, 2000r/min and 2200r/min work is selected, the input rotating speeds of the system are set in a test, the input rotating speeds of different components are obtained through the calculation of the transmission ratio, and the no-load oil stirring power loss of each component is further obtained; through comparison, three components with the proportion of oil stirring power loss in the system ranked from large to small are selected for inhibiting the oil stirring power loss; the oil stirring power loss conditions of all the components at the highest gear and different rotating speeds are shown in the table 1;
TABLE 1 comparison of No-load Stir oil Power losses for each component
Figure BDA0002709972330000071
As can be seen from table 1, when the input rotation speed of this embodiment is 2199r/min, the idle load maximum churning power loss value and the maximum total churning power loss of each component are the largest, as shown in fig. 1, the calculated idle load loss ratio of the planetary transmission mechanism is the largest, which is 53.50/158.67-33.72%, and then the ratio of the idle load loss ratio of the planetary transmission mechanism is 25.56/158.67-16.11%, and the ratio of the idle load loss ratio of the planetary transmission mechanism is 3.65/158.67-14.07%; therefore, the planetary speed change mechanism and hydraulic elements (namely, the steering hydraulic coupler and the hydraulic retarder) are selected for oil mixing power loss suppression;
and 2, inhibiting the oil stirring power loss of the planetary speed change mechanism and the hydraulic element selected in the step 1, wherein the inhibiting method comprises the following steps: the minimum distance between parts with the maximum speed difference in the planetary speed change mechanism is increased, leakage loss of a hydraulic element liquid filling control valve is reduced, and a sealing ring material with a small friction coefficient, such as polyimide, is adopted;
(1) the minimum distance between the parts with the maximum speed difference in the planetary speed change mechanism is increased, so that the oil stirring power loss between the parts of the comprehensive transmission system is inhibited;
under the no-load working condition of the comprehensive transmission system, lubricating oil flows out of each lubricating point in the planetary speed change mechanism, and is in an inertial flow state under the rotation action of a lubricating part; the lubricating oil is mixed with air in a box body of the planetary speed change mechanism to form a gas-liquid two-phase flow state, and a flow field of the gas-liquid two-phase flow is a non-uniformly distributed flow field; the distribution of the lubricating oil changes along with the change of the distance between the rotating center of the transmission shaft system and the inner wall of the box body;
the method comprises the following steps of firstly, establishing a gas-liquid two-phase mixed flow field model by taking the rotation center of a transmission shaft system and the inner wall of a box body as reference standards:
the lubricating oil is set to be diffused to the circumferential direction under the action of centrifugal force, so that the fluid density of the gas-liquid two-phase mixed flow field is as follows:
Figure BDA0002709972330000081
in the formula, ρ0Fluid density, rho, of a gas-liquid two-phase mixed flow fieldairIs the air density, poilIn order to obtain the density of lubricating oil, x is the distance (mm) from any point of the lubricating oil in the gas-liquid two-phase mixed flow field to the wall surface of the lubricating part, and v is the linear velocity (m/s) of the wall surface of the lubricating part;
therefore, it can be known that the distribution of the lubricating oil in the gas-liquid two-phase mixed flow field is related to the distance from the wall surface of the lubricating part and the linear velocity of the wall surface of the lubricating part, and as the linear velocity of the wall surface of the lubricating part increases, the closer the wall surface of the lubricating part is, the less the distribution of the lubricating oil is, see fig. 2;
secondly, in an actual working condition, because the gas-liquid two-phase mixed flow field is positioned in a closed environment in the planetary speed change mechanism, the two sides of the gas-liquid two-phase mixed flow field are respectively the wall surfaces of two lubricating parts in the planetary speed change mechanism; therefore, the three-dimensional flow space of the gas-liquid two-phase mixed flow field can be simplified into two-dimensional fluid distribution between the wall surfaces of two lubricating parts, and the calculation formula of the fluid density of the gas-liquid two-phase mixed flow field in the formula (1) is converted into:
Figure BDA0002709972330000082
in the formula, v1、v2Linear velocity (m/s), x, of the walls of two lubricated parts, respectively1、x2Respectively the distance (mm) from any point of lubricating oil in the gas-liquid two-phase mixed flow field to the wall surfaces of the two lubricating parts;
order to
Figure BDA0002709972330000083
Then equation (2) translates to:
Figure BDA0002709972330000084
according to the similarity of the physical properties of the fluid viscosity and the fluid density, the fluid viscosity mu of the gas-liquid two-phase mixed flow field can be obtained0The calculation model is:
Figure BDA0002709972330000085
in the formula, muairIs air viscosity, μoilIs the viscosity of the lubricating oil;
selecting any one of the two lubricating parts as a research object, and establishing a resistance model for the frictional resistance between the wall surface of the selected lubricating part and the fluid of the gas-liquid two-phase mixed flow field by a flat boundary layer calculation method; the frictional resistance F is:
Figure BDA0002709972330000091
wherein, CfFor the fluid frictional resistance, the expression is:
Figure BDA0002709972330000092
where Re is the Reynolds number (indicating the degree of turbulence in the fluid flow, with greater indicating greater turbulence), and v0The linear velocity of the fluid of the gas-liquid two-phase mixed flow field relative to the selected lubricating part is defined as B, the contact width of the wall surface of the selected lubricating part and the fluid of the gas-liquid two-phase mixed flow field is defined as B, and the contact length of the wall surface of the selected lubricating part and the fluid of the gas-liquid two-phase mixed flow field is defined as L.
Fourthly, according to a formula (6), obtaining the oil stirring power loss P of the lubricated parts selected in the third step1，P1The expression of (a) is as follows:
P1＝Fv0formula (7)
According to the formula (7), under the no-load working condition, the oil stirring power loss of the lubricating part selected in the third step is related to the frictional resistance F, and further related to the fluid density rho of the gas-liquid two-phase mixed flow field0With respect to the distance between two lubricated parts; particularly, the distance between two lubricating parts with higher relative rotation speed difference is smaller, and the oil stirring power loss is larger; referring to FIG. 3, when the distance between two lubricated parts (i.e., x)1+x2) When the diameter is less than 0.5mm, the oil film shearing function is realized, so that the oil stirring power loss is greatly increased; therefore, in the integrated transmission system, the minimum distance between two lubrication parts with the relative maximum speed difference is larger than 1mm, if there is enough space inside the integrated transmission system, and the oil stirring power loss of the integrated transmission system is greatly reduced after the minimum distance is larger than 2 mm.
(2) The oil mixing power loss of the hydraulic element is inhibited by reducing the leakage of the hydraulic element liquid filling control valve;
the hydraulic coupler and the hydraulic retarder are hydraulic elements in the comprehensive transmission system, and the oil stirring power loss of the elements in the hydraulic system is more complicated to calculate due to the complex shape and the complex oil charging state of a cascade inside the hydraulic elements; in the comprehensive transmission system, the hydraulic speed reducer is divided into a fixed wheel and a movable wheel, and under all working states, a large and fixed relative speed difference exists between the fixed wheel and the movable wheel; the hydraulic coupler and the hydraulic reducer have basically the same structure, and in an oil-filled state, the relative speed difference between a pump impeller and a turbine of the hydraulic coupler changes along with the change of a working state;
the liquid filling control valve leaks, and oil enters the hydraulic element and is mixed with air in the hydraulic element to form a gas-liquid two-phase mixed flow field; at this time, the hydraulic element is in an oil-filled state;
oil mixing power loss P of hydraulic element in oil-filled state2The calculation formula of (a) is as follows:
P2＝ρ0'gλn3D5formula (8)
In the formula, ρ0The two impellers of the hydraulic element are respectively a fixed wheel and a movable wheel of a hydraulic speed reducer or a pump wheel and a turbine of a hydraulic coupler; d is the effective duty cycle circle diameter, and λ is the torque coefficient, which can be obtained from the oil churning power loss of Table 1, and the expression for λ is as follows:
Figure BDA0002709972330000101
in the formula, nBThe pump wheel speed of the fluid coupling or the fixed wheel speed of the fluid retarder, nTThe rotational speed of a turbine of the hydraulic coupler or the rotational speed of a driving wheel of the hydraulic retarder; if n isB≠0,
Figure BDA0002709972330000102
If n isB0, λ is constant;
let δ be ρ0'gλD5Then, equation (8) is changed to:
P2＝δn3formula (10)
According to the formula (10), the oil churning power loss of the hydraulic element in the oil-filled state is related to the relative rotating speed between the impellers, namely the oil churning power loss of the hydraulic speed reducer is related to the relative rotating speed between the movable wheel and the fixed wheel, and the oil churning power loss of the hydraulic coupler is related to the relative rotating speed between the pump wheel and the turbine wheel; the leakage of the liquid filling control valve is less, the relative rotating speed between the impellers is smaller, the oil stirring power loss is smaller, the relative rotating speed between the impellers is larger, the oil stirring power loss is increased more quickly, and therefore the leakage of the liquid filling control valve is an effective measure for inhibiting the oil stirring power loss.
(3) The power loss of the rotary sealing element is restrained by adopting a sealing ring material with a smaller friction coefficient, such as polyimide;
because a plurality of rotary sealing structures exist in the comprehensive transmission system, the rotary sealing structure has high pressure and high linear speed, and certain oil stirring power loss also exists; establishing a dynamic sealing ring power loss model according to the motion rule influence factors and the frictional resistance influence factors, and calculating to obtain the relation between the friction coefficient of the material sealing ring and the oil stirring power loss;
firstly, analyzing motion law influence factors, namely calculating the oil stirring power loss between two binding surfaces with relative motion in a relative high-speed motion space according to a motion state;
referring to fig. 4, the rotary seal structure includes: the rotary shaft, the oil distribution sleeve and the sealing ring; an annular groove is processed on the outer circumferential surface of the rotating shaft; the sealing ring is arranged in the annular groove; the oil distribution sleeve is sleeved outside the rotating shaft, and a gap is reserved between the inner circumferential surface of the oil distribution sleeve and the outer circumferential surface of the rotating shaft; the outer circumferential surface of the sealing ring is an AB surface, the inner circumferential surface of the sealing ring is a CD surface, and the two end surfaces of the sealing ring are respectively an AD surface and a CB surface; wherein, the AB surface of the sealing ring is in contact with the inner circumferential surface of the oil distribution sleeve; the BC surface of the sealing ring is in fit contact with the wall surface of the annular groove on the rotating shaft; the sealing oil of the comprehensive transmission system is filled in the annular groove on the rotating shaft, and the oil pressure of the sealing oil isp0Under the action of the pressure of the sealing oil, frictional resistance F is generated between the AB surface of the sealing ring and the inner circumferential surface of the oil distribution sleeveABFrictional resistance F is generated between the CB surface of the seal ring and the wall surface of the annular groove of the rotary shaftCB；
When F is presentCB>FABWhen the oil stirring device is used, the sealing ring and the rotating shaft rotate together, and the oil stirring power loss comes from frictional resistance FAB；
FAB＝p02πr1Hf1Formula (11)
In the formula, r1Is the outer diameter of the seal ring, H is the axial length of the seal ring, f1The friction coefficient between the sealing ring and the oil distribution sleeve is defined as the friction coefficient;
when F is presentCB<FABWhen the oil mixing machine is used, the sealing ring and the oil distribution sleeve rotate together, and the oil mixing power loss comes from frictional resistance FCB；
Figure BDA0002709972330000111
In the formula, r1Is the outer diameter of the sealing ring, r2The inner diameter of the seal ring is delta is the clearance between the outer circumferential surface of the rotating shaft and the inner circumferential surface of the oil distribution sleeve, f2The coefficient of friction between the sealing ring and the wall surface of the annular groove of the rotating shaft;
when F is presentCB＝FABWhen the sealing ring rotates along with the rotating shaft, the oil stirring power loss comes from frictional resistance FAB(ii) a When the sealing ring rotates along with the oil distribution sleeve, the oil stirring power loss comes from frictional resistance FCB；
Judging the motion state of the seal ring according to the motion coefficient sigma, wherein the motion coefficient sigma is expressed as follows:
Figure BDA0002709972330000112
according to the formula (13), the motion state of the seal ringThe friction coefficient f is related to the friction coefficient, the size of the sealing ring and the fit clearance, and because the mating part of the sealing ring is a metal part (the mating part comprises a rotating shaft and an oil distribution sleeve) and the machining precision of the rotating shaft and the oil distribution sleeve is the same1＝f2The motion coefficient sigma is only related to the geometric dimension and the fit clearance of the sealing ring, the geometric dimension and the fit clearance of the sealing ring are substituted into a formula (13), sigma is calculated, and the calculation result shows that the sigma is far less than 1, so that the sealing ring and the oil distribution sleeve are judged to rotate together, and the power loss of the sealing ring comes from the frictional resistance FCB；
Secondly, the friction resistance influencing factor analysis is carried out, namely, the friction coefficient f in the formula (12) is determined through experiments2；
The formula (12) deduces the expression of the friction torque M applied to the sealing ring as follows:
Figure BDA0002709972330000113
wherein D is frictional resistance FCBThe value of the friction torque M can be obtained by tests, which are: selecting more than two sealing ring samples with the same geometric dimension but different materials, performing a contrast test, and obtaining the friction torque M borne by the sealing ring through a torquemeter test in the test process;
the friction coefficient f can be obtained by substituting the test result, i.e., the value of the friction torque M, into the formula (14)2The change rule of the friction coefficient change and the friction torque of the sealing rings made of different materials is obtained according to the change trend as follows:
Figure BDA0002709972330000121
thirdly, calculating the oil stirring power loss P of the sealing ring according to the formula (15)3The expression is as follows:
Figure BDA0002709972330000122
in the formula, n is the rotating speed of the rotating shaft;
according to the formula (16), the oil stirring power loss of the sealing ring is related to the friction coefficient of the material, and the sealing ring material with a small friction coefficient is selected, so that the oil stirring power loss can be reduced; the test proves that the friction coefficient of the sealing ring of the polyimide material is the minimum, so that the oil stirring power loss of the system can be reduced by selecting the polyimide sealing ring.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (5)

1. A design method for inhibiting oil stirring power loss of a transmission system is characterized by comprising the following specific steps:
step 1, obtaining the oil mixing power loss of each component in the comprehensive transmission system at different rotating speeds through an oil mixing power loss test, and selecting more than two components which are arranged at the front in the oil mixing power loss of the comprehensive transmission system from large to small for power suppression; the selected components are a planetary speed change mechanism and a hydraulic element, wherein the hydraulic element comprises a steering hydraulic coupler and a hydraulic retarder;
and 2, inhibiting the oil stirring power loss of the member selected in the step 1, wherein the inhibiting method comprises the following steps: the minimum distance between the parts with the maximum speed difference in the planetary speed change mechanism is increased, the leakage loss of a liquid filling control valve of a hydraulic element is reduced, and a sealing ring material with a small friction coefficient is adopted.
2. The design method for suppressing oil churning power loss of the transmission system according to claim 1, wherein the material of the seal ring is polyimide.
3. The method of claim 1, wherein the relationship between the minimum distance between the parts with the maximum speed difference in the member selected in step 2 and the churning power loss is calculated as follows:
under the no-load working condition of the comprehensive transmission system, lubricating oil flows out of each lubricating point in the planetary speed change mechanism, and is in an inertial flow state under the rotation action of a lubricating part; the lubricating oil is mixed with air in a box body of the planetary speed change mechanism to form a gas-liquid two-phase flow state, and a flow field of the gas-liquid two-phase flow is a non-uniformly distributed flow field; the distribution of the lubricating oil changes along with the change of the distance between the rotating center of the transmission shaft system and the inner wall of the box body;
the method comprises the following steps of firstly, establishing a gas-liquid two-phase mixed flow field model by taking the rotation center of a transmission shaft system and the inner wall of a box body as reference standards:
the lubricating oil is set to be diffused to the circumferential direction under the action of centrifugal force, so that the fluid density of the gas-liquid two-phase mixed flow field is as follows:
Figure FDA0002709972320000011
in the formula, ρ0Fluid density, rho, of a gas-liquid two-phase mixed flow fieldairIs the air density, poilThe density of the lubricating oil is shown, x is the distance from any point of the lubricating oil in the gas-liquid two-phase mixed flow field to the wall surface of the lubricating part, and v is the linear velocity of the wall surface of the lubricating part;
therefore, it is known that the distribution of the lubricating oil in the gas-liquid two-phase mixed flow field is related to the distance from the wall surface of the lubricating part and the linear velocity of the wall surface of the lubricating part, and as the linear velocity of the wall surface of the lubricating part increases, the closer to the wall surface of the lubricating part, the less the distribution of the lubricating oil;
secondly, in an actual working condition, because the gas-liquid two-phase mixed flow field is positioned in a closed environment in the planetary speed change mechanism, the two sides of the gas-liquid two-phase mixed flow field are respectively the wall surfaces of two lubricating parts in the planetary speed change mechanism; therefore, the three-dimensional flow space of the gas-liquid two-phase mixed flow field is simplified into two-dimensional fluid distribution between the wall surfaces of two lubricating parts, and the calculation formula of the fluid density of the gas-liquid two-phase mixed flow field in the formula (1) is converted into:
Figure FDA0002709972320000021
in the formula, v1、v2Linear velocity, x, of the walls of two lubricated parts, respectively1、x2Respectively the distance between any point of lubricating oil in the gas-liquid two-phase mixed flow field and the wall surfaces of the two lubricating parts;
order to
Figure FDA0002709972320000022
Then equation (2) translates to:
Figure FDA0002709972320000023
obtaining the fluid viscosity mu of the gas-liquid two-phase mixed flow field according to the similarity of the fluid viscosity and the physical properties of the fluid density0The calculation model is:
Figure FDA0002709972320000024
in the formula, muairIs air viscosity, μoilIs the viscosity of the lubricating oil;
selecting any one of the two lubricating parts as a research object, and establishing a resistance model for the frictional resistance between the wall surface of the selected lubricating part and the fluid of the gas-liquid two-phase mixed flow field by a flat boundary layer calculation method; the frictional resistance F is:
Figure FDA0002709972320000025
wherein, CfFor the fluid frictional resistance, the expression is:
Figure FDA0002709972320000026
wherein Re is a Reynolds number, v0The linear velocity of the fluid of the gas-liquid two-phase mixed flow field relative to the selected lubricating part is defined as B, the contact width of the wall surface of the selected lubricating part and the fluid of the gas-liquid two-phase mixed flow field is defined as B, and the contact length of the wall surface of the selected lubricating part and the fluid of the gas-liquid two-phase mixed flow field is defined as L.
Fourthly, according to a formula (6), obtaining the oil stirring power loss P of the lubricated parts selected in the third step1，P1The expression of (a) is as follows:
P1＝Fv0formula (7)
According to the formula (7), under the no-load working condition, the oil stirring power loss of the lubricating part selected in the third step is related to the frictional resistance F, and further related to the fluid density rho of the gas-liquid two-phase mixed flow field0With respect to the distance between two lubricated parts; the smaller the distance between the two lubricated parts is, the greater the oil stirring power loss of the lubricated parts is.
4. The design method for inhibiting the oil churning power loss of the transmission system according to claim 1, wherein the relation between the leakage of the hydraulic filling control valve of the hydraulic element and the oil churning power loss in the step 2 is calculated as follows:
the liquid filling control valve leaks, and oil enters the hydraulic element and is mixed with air in the hydraulic element to form a gas-liquid two-phase mixed flow field; at this time, the hydraulic element is in an oil-filled state;
oil mixing power loss P of hydraulic element in oil-filled state2The calculation formula of (a) is as follows:
P2＝ρ0'gλn3D5formula (8)
In the formula, ρ0' is the fluid density of a gas-liquid two-phase mixed flow field inside a hydraulic element, g is a constant, n is the relative rotating speed between two impellers of the hydraulic element, and the hydraulic elementTwo impellers of the device are respectively a fixed wheel and a driving wheel of a hydraulic retarder or a pump wheel and a turbine of a hydraulic coupler; d is the effective duty cycle circle diameter, and λ is the torque coefficient, which can be obtained from the oil churning power loss of Table 1, and the expression for λ is as follows:
Figure FDA0002709972320000031
in the formula, nBThe pump wheel speed of the fluid coupling or the fixed wheel speed of the fluid retarder, nTThe rotational speed of a turbine of the hydraulic coupler or the rotational speed of a driving wheel of the hydraulic retarder; if n isB≠0,
Figure FDA0002709972320000032
If n isB0, λ is constant;
let δ be ρ0'gλD5Then, equation (8) is changed to:
P2＝δn3formula (10)
According to the formula (10), the oil churning power loss of the hydraulic element in the oil-filled state is related to the relative rotating speed between the impellers, namely the oil churning power loss of the hydraulic speed reducer is related to the relative rotating speed between the movable wheel and the fixed wheel, and the oil churning power loss of the hydraulic coupler is related to the relative rotating speed between the pump wheel and the turbine wheel; the less oil leakage of the liquid filling control valve, the smaller the relative rotating speed between the impellers, and the smaller the oil stirring power loss.
5. The design method for inhibiting the oil churning power loss of the transmission system according to claim 1, wherein the relation between the friction coefficient of the sealing ring material and the oil churning power loss in the step 2 is calculated as follows:
firstly, analyzing motion law influence factors, namely calculating the oil stirring power loss between two binding surfaces with relative motion in a relative high-speed motion space according to a motion state;
the rotary seal structure includes: the rotary shaft, the oil distribution sleeve and the sealing ring; what is needed isAn annular groove is processed on the outer circumferential surface of the rotating shaft; the sealing ring is arranged in the annular groove; the oil distribution sleeve is sleeved outside the rotating shaft, and a gap is reserved between the inner circumferential surface of the oil distribution sleeve and the outer circumferential surface of the rotating shaft; the outer circumferential surface of the sealing ring is an AB surface, the inner circumferential surface of the sealing ring is a CD surface, and the two end surfaces of the sealing ring are respectively an AD surface and a CB surface; wherein, the AB surface of the sealing ring is in contact with the inner circumferential surface of the oil distribution sleeve; the BC surface of the sealing ring is in fit contact with the wall surface of the annular groove on the rotating shaft; the sealing oil of the comprehensive transmission system is filled in the annular groove on the rotating shaft, and the oil pressure of the sealing oil is p0Under the action of the pressure of the sealing oil, frictional resistance F is generated between the AB surface of the sealing ring and the inner circumferential surface of the oil distribution sleeveABFrictional resistance F is generated between the CB surface of the seal ring and the wall surface of the annular groove of the rotary shaftCB；
When F is presentCB>FABWhen the oil stirring device is used, the sealing ring and the rotating shaft rotate together, and the oil stirring power loss comes from frictional resistance FAB；
FAB＝p02πr1Hf1Formula (11)
In the formula, r1Is the outer diameter of the seal ring, H is the axial length of the seal ring, f1The friction coefficient between the sealing ring and the oil distribution sleeve is defined as the friction coefficient;
when F is presentCB<FABWhen the oil mixing machine is used, the sealing ring and the oil distribution sleeve rotate together, and the oil mixing power loss comes from frictional resistance FCB；
Figure FDA0002709972320000041
In the formula, r1Is the outer diameter of the sealing ring, r2The inner diameter of the seal ring is delta is the clearance between the outer circumferential surface of the rotating shaft and the inner circumferential surface of the oil distribution sleeve, f2The coefficient of friction between the sealing ring and the wall surface of the annular groove of the rotating shaft;
when F is presentCB＝FABWhen the sealing ring rotates along with the rotating shaft, the sealing ring can rotate along with the rotating shaft or the oil distribution sleeveThe oil churning power loss comes from the frictional resistance FAB(ii) a When the sealing ring rotates along with the oil distribution sleeve, the oil stirring power loss comes from frictional resistance FCB；
Judging the motion state of the seal ring according to the motion coefficient sigma, wherein the motion coefficient sigma is expressed as follows:
Figure FDA0002709972320000042
according to the formula (13), since the machining accuracy of the rotary shaft and the oil distribution sleeve is the same, the friction coefficient f1＝f2The motion coefficient sigma is only related to the geometric dimension and the fit clearance of the sealing ring, the geometric dimension and the fit clearance of the sealing ring are substituted into a formula (13), sigma is calculated, and the calculation result shows that the sigma is far less than 1, so that the sealing ring and the oil distribution sleeve are judged to rotate together, and the power loss of the sealing ring comes from the frictional resistance FCB；
Secondly, the friction resistance influencing factor analysis is carried out, namely, the friction coefficient f in the formula (12) is determined through experiments2；
The formula (12) deduces the expression of the friction torque M applied to the sealing ring as follows:
Figure FDA0002709972320000051
wherein D is frictional resistance FCBThe value of the friction torque M can be obtained by tests, which are: selecting more than two sealing ring samples with the same geometric dimension but different materials, performing a contrast test, and obtaining the friction torque M borne by the sealing ring through a torquemeter test in the test process;
the friction coefficient f can be obtained by substituting the test result, i.e., the value of the friction torque M, into the formula (14)2The change rule of the friction coefficient change and the friction torque of the sealing rings made of different materials is obtained according to the change trend as follows:
Figure FDA0002709972320000052
thirdly, calculating the oil stirring power loss P of the sealing ring according to the formula (15)3The expression is as follows:
Figure FDA0002709972320000053
in the formula, n is the rotating speed of the rotating shaft;
according to the formula (16), the oil churning power loss of the sealing ring is related to the friction coefficient of the material, and the smaller the friction coefficient of the material of the sealing ring is, the smaller the oil churning power loss is.
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