A method for predicting oil stirring power loss of a high-power transmission device and a related device

Abstract

This invention belongs to the field of oil churning power loss prediction technology. To address the technical problem that existing gear oil churning power loss prediction methods fail to consider the influence of axial and radial clearances on the oil churning power loss under actual spatial structures, leading to inaccurate prediction results, this invention provides a method and related apparatus for predicting oil churning power loss in high-power transmission devices. First, based on the equivalent base circle diameter and equivalent angular velocity of the spur gear pair, the characteristic Reynolds number of fluid motion under oil injection lubrication is calculated. Then, based on the characteristic Reynolds number of fluid motion under oil injection lubrication, a calculation model for oil churning power loss in spur gear oil injection lubrication is determined, and the oil churning power loss of the spur gear is calculated. Finally, based on the oil churning power loss of each spur gear in the high-power transmission device, the oil churning power loss in the high-power transmission device is predicted.

Description

Technical Field

[0001] This invention belongs to the field of oil stirring power loss prediction technology, and relates to a method and related device for predicting oil stirring power loss in a high-power transmission device. Background Technology

[0002] Gear transmission is one of the most important transmission methods in mechanical transmission, possessing advantages such as compact structure, reliable operation, and stable transmission ratio, and is widely used in high-power transmission devices. Improving gear transmission efficiency is of great significance for enhancing the performance of high-power transmission devices and achieving energy conservation and emission reduction; therefore, predicting gear power loss during the design phase is particularly important.

[0003] Many factors influence gear churning power loss, including the number of teeth, module, helix angle, tooth width, lubricant viscosity, density, temperature, gear speed, and oil immersion depth. The main lubrication methods for gears in transmission devices are immersion lubrication and spray lubrication. Spray lubrication involves directly spraying lubricating oil onto the gear meshing points through nozzles. The lubricating oil is then filtered and cooled by the oil circuit system before being reused. In high-power transmission devices used in automobiles and aircraft engines, gears are housed in precisely machined and tightly sealed housings. The narrow gaps between gears and between gears and the housing also affect churning losses. Gear churning losses account for a significant proportion of total power loss. Furthermore, existing calculations of gear churning power loss primarily focus on single or single-pair gears in open spaces, neglecting the impact of axial and radial clearances on churning power loss in real-world spatial structures. Therefore, establishing a method for calculating gear churning losses in real-world spatial structures is crucial for predicting churning power losses in high-power transmission devices. Summary of the Invention

[0004] The purpose of this invention is to solve the technical problem that existing gear churning power loss prediction methods fail to consider the influence of gear axial and radial clearances on churning power loss under actual spatial structure, resulting in inaccurate prediction results. This invention provides a method and related apparatus for predicting churning power loss in high-power transmission devices.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] In a first aspect, the present invention provides a method for predicting the power loss of oil churning in a high-power transmission device, comprising the following steps:

[0007] Step 1: Calculate the Reynolds number of the fluid motion characteristics under oil injection lubrication of spur gears based on the equivalent base circle diameter and the equivalent angular velocity of the spur gear pair.

[0008] Step 2: Based on the Reynolds number of the fluid motion characteristics under spur gear oil injection lubrication, determine the calculation model for the oil churning power loss of spur gear oil injection lubrication, and calculate the oil churning power loss of spur gear.

[0009] Step 3: Based on the oil stirring power loss of each spur gear in the high-power transmission device, predict the oil stirring power loss in the high-power transmission device.

[0010] In a second aspect, the present invention provides a high-power transmission device oil stirring power loss prediction system for implementing the above-mentioned high-power transmission device oil stirring power loss prediction method, including a Reynolds number calculation module, a power loss calculation module and a prediction module.

[0011] The Reynolds number calculation module is used to calculate the Reynolds number of fluid motion characteristics under oil injection lubrication of spur gears based on the equivalent base circle diameter and the equivalent angular velocity of the spur gear pair.

[0012] The power loss calculation module determines the power loss calculation model for spur gear oil injection lubrication based on the Reynolds number of the fluid motion characteristics under spur gear oil injection lubrication, and calculates the power loss of spur gear oil injection lubrication.

[0013] The prediction module is used to predict the oil stirring power loss in the high-power transmission device based on the oil stirring power loss of each spur gear.

[0014] Thirdly, the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the above-described method for predicting the power loss of oil stirring in a high-power transmission device.

[0015] Fourthly, the present invention provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the above-described method for predicting the power loss of oil stirring in a high-power transmission device.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This invention proposes a method for predicting the oil churning power loss of high-power transmission devices, encompassing a more comprehensive range of influencing factors, including those related to the narrow gaps in the actual spatial structure of the transmission device. Compared to conventional methods for calculating gear oil churning power loss, this method can calculate and predict the oil churning power loss of spur gears under common oil-spraying lubrication conditions in transmission devices, rather than being limited to oil-immersion lubrication conditions. Secondly, compared to conventional methods for calculating gear oil churning power loss, this method can calculate the oil churning power loss of gear pairs, and its results have been verified to be more consistent with engineering applications. The gear base circle diameter and rotational speed are calculated using the equivalent base circle diameter and equivalent angular velocity of the gear pair proposed in this invention. Furthermore, compared to conventional methods for calculating gear oil churning power loss in open spaces, this method can calculate the gear oil churning power loss under narrow gaps in actual transmission devices, more closely approximating real-world conditions. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a flowchart illustrating a method for predicting oil stirring power loss in a high-power transmission device according to the present invention.

[0020] Figure 2 This is a schematic diagram of an embodiment of an oil stirring power loss prediction system in a high-power transmission device according to the present invention;

[0021] Figure 3 This is a flowchart illustrating an embodiment of a method for predicting oil stirring power loss in a high-power transmission device according to the present invention.

[0022] Figure 4 This is a calibration diagram of the injection angle in an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of a radially narrow gap in a confined space during an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of a narrow axial gap in a confined space during an embodiment of the present invention. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0031] The present invention will now be described in further detail with reference to the accompanying drawings:

[0032] This invention discloses a method and related apparatus for calculating the power loss of spur gear oil injection lubrication and churning in confined spaces, belonging to the field of gear transmission. Gear transmission efficiency has a significant impact on the efficiency, fuel consumption, stability, and reliability of power equipment. To accurately calculate the power loss of spur gear oil injection lubrication and churning under the actual spatial structure inside the transmission device, a method for predicting the power loss of spur gear oil injection lubrication and churning under confined spaces is proposed. The method mainly includes several steps: extraction of spur gear structural parameters, extraction of spur gear motion parameters within the transmission device, calculation of the Reynolds number of fluid motion characteristics, extraction of spur gear spatial structural parameters under confined spaces, and calculation of the power loss of spur gear oil injection lubrication and churning under confined spaces. Compared to conventional methods for predicting spur gear churning loss under immersion lubrication, this invention is applicable to common oil injection lubrication situations within transmission devices. Furthermore, it introduces a confined space correction coefficient to address the actual spatial structure within the transmission device, further improving the accuracy of churning power loss prediction. This method can be used for spur gear distribution design or lubrication circuit system design within transmission devices.

[0033] See Figure 1 This invention discloses a method for predicting oil churning power loss in a high-power transmission device, comprising the following steps:

[0034] S1, calculate the equivalent base circle diameter of the spur gear pair, as follows:

[0035]

[0036] In the formula, D p D is the base circle diameter of the driving wheel; d The base circle diameter of the driven wheel is given.

[0037] S2, calculate the equivalent angular velocity of the spur gear pair, as follows:

[0038]

[0039] Among them, D m v is the equivalent base circle diameter of the spur gear pair. e Let be the meshing linear velocity of the gear pair, and:

[0040]

[0041] Where, n p n is the operating speed of the drive wheel. d D is the operating speed of the driven wheel. p D is the base circle diameter of the driving wheel; d The base circle diameter of the driven wheel is given.

[0042] S3. Calculate the characteristic Reynolds number R of the fluid motion under oil injection lubrication of the spur gear pair based on the equivalent base circle diameter and equivalent angular velocity of the spur gear pair. e The details are as follows:

[0043]

[0044] Where ρ is the density of the lubricating oil; ω m ω is the equivalent angular velocity of the spur gear pair; μ is the viscosity of the lubricating oil.

[0045] S4, Calculate the radial clearance δ between the gear and the wall. 径向 Equivalent base circle diameter D of spur gear pair m ratio and the axial clearance δ between the gear and the wall surface 轴向 The ratio of the gear width B

[0046] S5. Based on the Reynolds number of fluid motion characteristics under spur gear oil injection lubrication, select the corresponding calculation model for the oil churning power loss of spur gear oil injection lubrication in a confined space, and calculate the oil churning power loss of spur gear.

[0047] The calculation model for the power loss of spur gear oil injection lubrication churning oil in confined spaces is determined by the following formula:

[0048]

[0049]

[0050]

[0051] Where Q is the oil injection lubrication flow rate; For oil injection lubrication angle; R e Let be the Reynolds number representing the fluid motion characteristics under oil-lubricated spur gears, and P be the power loss due to oil churning in spur gears.

[0052] S6. Based on the spur gear churning power loss, predict the churning power loss in the high-power transmission device. For a specific high-power gear transmission device, record the structural parameters, motion parameters, and clearance parameters of each gear pair in the transmission device. Calculate the churning power loss of each gear pair according to the method described in S5. Add the churning power losses of each gear pair to obtain the churning power loss in the high-power transmission device.

[0053] like Figure 2 As shown in the figure, this invention also discloses a churning power loss prediction system in a high-power transmission device, comprising:

[0054] The base circle diameter calculation module is used to calculate the equivalent base circle diameter of the spur gear pair and send it to the Reynolds number calculation module;

[0055] The angular velocity calculation module is used to calculate the equivalent angular velocity of the spur gear pair and send it to the Reynolds number calculation module;

[0056] The Reynolds number calculation module is used to calculate the Reynolds number of the fluid motion characteristics of the spur gear under oil injection lubrication based on the equivalent base circle diameter and the equivalent angular velocity of the spur gear pair, and then send it to the power loss calculation module.

[0057] The clearance calculation module is used to calculate the ratio of the radial clearance between the gear and the wall to the gear diameter and the ratio of the axial clearance between the gear and the wall to the gear width, and then send the results to the power loss calculation module.

[0058] The power loss calculation module is used to select the corresponding power loss calculation model for spur gear oil injection lubrication in confined spaces based on the Reynolds number of fluid motion characteristics under spur gear oil injection lubrication, the ratio of the radial clearance between the gear and the wall to the gear diameter, and the ratio of the axial clearance between the gear and the wall to the gear width, and to calculate the power loss of spur gear oil injection lubrication in confined spaces.

[0059] The prediction module is used to predict the oil stirring power loss in high-power transmission devices based on the oil stirring power loss of spur gears.

[0060] The following is a specific embodiment of the oil stirring power loss prediction method in a high-power transmission device according to the present invention:

[0061] like Figure 3 As shown, the present invention will be further explained and illustrated with specific prediction examples:

[0062] Step 1, confirming the design or analysis process of spur gears in a certain transmission system, is a routine process and will not be shown or explained here;

[0063] Step 2: Extract the structural parameters, kinematic parameters, lubricating oil properties, lubrication state parameters, and narrow space clearance parameters of the spur gear.

[0064] Step 3: Calculate the Reynolds number of the fluid motion characteristics under oil injection lubrication of spur gears;

[0065] Step 4: Based on the Reynolds number of fluid motion characteristics under oil injection lubrication, select a suitable calculation model for the spur gear oil injection lubrication churning power loss in a confined space, and calculate the spur gear churning power loss in the transmission device.

[0066] The power loss of spur gear oil injection lubrication and churning in a confined space obtained by the present invention was compared with the numerical simulation results under 15 different clearance parameters. The results are shown in Table 1.

[0067] Table 1 Comparison of power loss results for spur gear oil injection lubrication in confined spaces

[0068]

[0069]

[0070] As can be seen from the comparison of the results in Table 1, the calculation results of the method for calculating the oil churning power loss of spur gears under oil injection lubrication in confined spaces according to the present invention are close to the numerical simulation results, with the errors of the 15 comparative examples all within 25%. Therefore, the calculation method of the present invention can meet the engineering requirements for predicting the oil churning power loss of spur gears under oil injection lubrication conditions in confined spaces.

[0071] like Figure 4 The diagram illustrates the spur gear oil injection angle when applying this invention. Figure 4 In the diagram, A represents the nozzle, and B represents the direction of the high-speed gear, which is taken as the positive direction. It is generally assumed that the nozzle points horizontally towards the high-speed gear (ω in the diagram). 高速 When the nozzle is on one side (in the direction it is located in), the injection angle is 0°. Under different injection angles, the angle between the nozzle and the horizontal direction is defined as the injection angle φ. At the same time, in order to ensure that the nozzle is aligned with the meshing point of the gear, the injection angle is limited according to the actual situation to ensure that the lubricating oil can be sprayed to the meshing point of the gear to achieve the lubrication effect.

[0072] like Figure 5 and Figure 6 As shown, the radial distance between the gear and the wall is the radial clearance of the gear. Figure 5 At point C, the axial distance between the gear and the wall is the axial clearance of the gear. Figure 6 (at point D in the middle).

[0073] Another embodiment of the present invention provides a computer device. This embodiment of the computer device includes: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps in the above-described embodiment of the high-power transmission device oil churning power loss prediction method. Alternatively, when the processor executes the computer program, it implements the functions of each module / unit in the above-described embodiment of the high-power transmission device oil churning power loss prediction system.

[0074] The computer program can be divided into one or more modules / units, which are stored in the memory and executed by the processor to complete the present invention.

[0075] The computer device may be a desktop computer, laptop, handheld computer, or cloud server, etc. The computer device may include, but is not limited to, a processor and memory.

[0076] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0077] The memory can be used to store the computer program and / or module, and the processor implements various functions of the computer device by running or executing the computer program and / or module stored in the memory, and by calling the data stored in the memory.

[0078] If the modules / units integrated into the computer device are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electrical carrier signals and telecommunication signals.

[0079] Another embodiment of the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the aforementioned method for predicting the power loss of oil stirring in a high-power transmission device.

[0080] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for predicting the power loss of oil stirring in a high-power transmission device, characterized in that, Includes the following steps: Step 1: Calculate the Reynolds number of the fluid motion characteristics under oil injection lubrication of spur gears based on the equivalent base circle diameter and the equivalent angular velocity of the spur gear pair. The equivalent base circle diameter of the spur gear pair We obtain it from the following formula: in, D p The diameter of the base circle of the driving wheel; D d The base circle diameter of the driven gear; The equivalent angular velocity of the spur gear pair We obtain it from the following formula: in, v e The meshing linear velocity of the gear pair; The Reynolds number characteristic of fluid motion under oil injection lubrication of spur gears is calculated by the following formula: in, R e The Reynolds number represents the characteristic fluid motion of spur gears under oil-lubricated conditions. ρ For the density of lubricating oil, μ The viscosity of the lubricating oil; Step 2: Based on the Reynolds number of the fluid motion characteristics under spur gear oil injection lubrication, determine the calculation model for the oil churning power loss of spur gear oil injection lubrication, and calculate the oil churning power loss of spur gear. The power loss of spur gear oil stirring is calculated using the following formula. : in, Q This refers to the oil injection lubrication flow rate; φ This refers to the oil injection lubrication angle; R e The Reynolds number represents the characteristic fluid motion of spur gears under oil-lubricated spray lubrication. This refers to the radial clearance between the gear and the wall surface. This refers to the axial clearance between the gear and the wall surface. B This refers to the gear width; Step 3: Based on the oil stirring power loss of each spur gear in the high-power transmission device, predict the oil stirring power loss in the high-power transmission device.

2. A high-power transmission device oil stirring power loss prediction system, used to implement the high-power transmission device oil stirring power loss prediction method of claim 1, characterized in that: It includes a Reynolds number calculation module, a power loss calculation module, and a prediction module; The Reynolds number calculation module is used to calculate the Reynolds number of fluid motion characteristics under oil injection lubrication of spur gears based on the equivalent base circle diameter and the equivalent angular velocity of the spur gear pair. The power loss calculation module determines the power loss calculation model for spur gear oil injection lubrication based on the Reynolds number of the fluid motion characteristics under spur gear oil injection lubrication, and calculates the power loss of spur gear oil injection lubrication. The prediction module is used to predict the oil stirring power loss in the high-power transmission device based on the oil stirring power loss of each spur gear.

3. The high-power transmission device oil stirring power loss prediction system according to claim 2, characterized in that: It also includes a base circle diameter calculation module, an angular velocity calculation module, and a gap calculation module; The base circle diameter calculation module is used to calculate the equivalent base circle diameter of the spur gear pair and send it to the Reynolds number calculation module; The angular velocity calculation module is used to calculate the equivalent angular velocity of the spur gear pair and send it to the Reynolds number calculation module; The clearance calculation module is used to calculate the radial clearance between the gear and the wall surface. Equivalent base circle diameter of spur gear pair D m ratio and the axial clearance between the gear and the wall surface With gear width B ratio And send it to the power loss calculation module.

4. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the oil stirring power loss prediction method for a high-power transmission device as described in claim 1.

5. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the oil stirring power loss prediction method for a high-power transmission device as described in claim 1.

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