Method for calculating power loss of spur gear stirring oil under oil injection lubrication and related device

Abstract

This invention discloses a method and related apparatus for calculating the churning power loss of spur gears under oil-spray lubrication, 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 churning power loss of gears under oil-spray lubrication in transmission devices, a method for predicting churning loss of spur gears under oil-spray lubrication is proposed. This method mainly includes several steps: extracting spur gear structural parameters, extracting spur gear motion parameters within the transmission device, calculating the Reynolds number of fluid motion characteristics, and calculating the churning power loss of spur gears under oil-spray lubrication. Compared to conventional methods for predicting churning loss of spur gears under immersion lubrication, this invention is applicable to common oil-spray lubrication conditions within transmission devices, improving the accuracy of churning power loss prediction. It can be used for the design of spur gear distribution or lubrication circuit systems within transmission devices.

Description

Technical Field

[0001] This invention belongs to the field of gear transmission technology and relates to a method and related device for calculating the power loss of spur gear oil churning under oil injection lubrication. Background Technology

[0002] Gear transmission efficiency has a significant impact on the efficiency, fuel consumption, stability, and reliability of power equipment. Gears, due to their high load-bearing capacity, smooth transmission, and low noise, are widely used in power equipment. Their transmission efficiency is crucial to the performance of power equipment; therefore, predicting gear power losses during the design phase is particularly important. Gear power losses are divided into load-related power losses and load-independent power losses. Load-independent power losses mainly include splashing, churning, and wind resistance losses. Gear churning loss is a major component of gear power loss, especially at high speeds and high lubrication levels. Many factors affect churning power loss, including the number of teeth, module, helix angle, tooth width, lubricating oil 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 and reused. Gear churning loss accounts for a large proportion of the total power loss; therefore, establishing a method for calculating gear churning loss is necessary. Summary of the Invention

[0003] The purpose of this invention is to solve the problems in the prior art and provide a method and related device for calculating the oil churning power loss of spur gears under oil injection lubrication, which can quickly and accurately predict the oil churning power loss of spur gears under oil injection lubrication conditions.

[0004] To achieve the above objectives, the present invention employs the following technical solution:

[0005] In a first aspect, the present invention provides a method for calculating the power loss of spur gear oil churning under oil injection lubrication, comprising the following steps:

[0006] Calculate the equivalent base circle diameter of a spur gear pair;

[0007] Calculate the equivalent angular velocity of a spur gear pair;

[0008] Calculate the Reynolds number of fluid motion characteristics under oil injection lubrication of spur gears based on the equivalent base circle diameter and equivalent angular velocity of the spur gear pair;

[0009] Based on the Reynolds number of the fluid motion characteristics under spur gear oil injection lubrication, select the corresponding spur gear oil churning power loss calculation model and calculate the spur gear oil churning power loss.

[0010] Secondly, the present invention provides a calculation system for the power loss of spur gear oil churning under oil injection lubrication, comprising:

[0011] The base circle diameter calculation module is used to calculate the equivalent base circle diameter of a spur gear pair.

[0012] The angular velocity calculation module is used to calculate the equivalent angular velocity of a spur gear pair.

[0013] 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.

[0014] The power loss calculation module is used to select the corresponding spur gear churning power loss calculation model based on the Reynolds number of the fluid motion characteristics under spur gear oil injection lubrication, and to calculate the spur gear churning power loss.

[0015] Thirdly, 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 method described above.

[0016] Fourthly, the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the method described above.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] Compared to conventional methods for calculating gear churning power loss, this invention can calculate and predict the churning power loss of spur gears under common oil-injection lubrication conditions in transmission devices, and is not limited to the churning power loss of spur gears under immersion lubrication conditions. Compared to conventional methods for calculating gear churning power loss, this invention can calculate the churning power loss of gear pairs, which is 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. This invention covers a wider range of influencing factors, including factors such as oil injection flow rate and injection angle, which are highly sensitive to power loss of spur gears under oil-injection lubrication conditions. Attached Figure Description

[0019] 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 of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1This is a flowchart of the method of the present invention.

[0021] Figure 2 This is a schematic diagram of the system of the present invention.

[0022] Figure 3 This is a flowchart of the method according to an embodiment of the present invention.

[0023] Figure 4 This is a calibration diagram of the injection angle in the implementation of this invention. Detailed Implementation

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] The present invention will now be described in further detail with reference to the accompanying drawings:

[0031] See Figure 1 This invention discloses a method for calculating the power loss of spur gear oil churning under oil injection lubrication, comprising the following steps:

[0032] S1 calculates the equivalent base circle diameter of the spur gear pair as follows:

[0033]

[0034] 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.

[0035] S2 calculates the equivalent angular velocity of the spur gear pair as follows:

[0036]

[0037] Among them, v e Let be the meshing linear velocity of the gear pair, and or D m n is the equivalent base circle diameter of the spur gear pair. 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.

[0038] S3 calculates the Reynolds number of the fluid motion characteristics of spur gears under oil injection lubrication based on the equivalent base circle diameter and equivalent angular velocity of the spur gear pair, as follows:

[0039]

[0040] Where ρ is the density of the lubricating oil; ω m D is the equivalent angular velocity of the spur gear pair. m denoted as the equivalent base circle diameter of the spur gear pair; μ represents the viscosity of the lubricating oil.

[0041] Based on the Reynolds number of the fluid motion characteristics under spur gear oil injection lubrication, S4 selects the corresponding spur gear oil churning power loss calculation model and calculates the spur gear oil churning power loss.

[0042] The calculation model for the power loss of spur gear oil stirring is as follows:

[0043]

[0044]

[0045]

[0046] Where ρ is the density of the lubricating oil; ω m D is the equivalent angular velocity of the spur gear pair. m Where is the equivalent base circle diameter of the spur gear pair; Q is the oil injection lubrication flow rate; For oil injection lubrication angle; R e B represents the Reynolds number, which is the characteristic fluid motion number of a spur gear under oil-lubricated spray lubrication; B is the gear width.

[0047] like Figure 2 As shown in the figure, an embodiment of the present invention discloses a calculation system for the power loss of spur gear oil churning under oil injection lubrication, comprising:

[0048] The base circle diameter calculation module is used to calculate the equivalent base circle diameter of a spur gear pair.

[0049] The angular velocity calculation module is used to calculate the equivalent angular velocity of a spur gear pair.

[0050] 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.

[0051] The power loss calculation module is used to select the corresponding spur gear churning power loss calculation model based on the Reynolds number of the fluid motion characteristics under spur gear oil injection lubrication, and to calculate the spur gear churning power loss.

[0052] Example

[0053] like Figure 3 As shown, specific calculation examples will be used to further explain and illustrate the present invention:

[0054] Step 1, the design or analysis process of a spur gear in a certain transmission system, is a routine process and will not be shown or explained here.

[0055] Step 2: Extract the structural parameters, kinematic parameters, lubricating oil properties, and lubrication state parameters of the spur gear.

[0056] Step 3: Calculate the Reynolds number of the fluid motion characteristics under oil injection lubrication of spur gears.

[0057] Step 4: Based on the Reynolds number of the fluid motion characteristics under oil injection lubrication, select a suitable spur gear oil churning power loss calculation model and calculate the spur gear oil churning power loss in the transmission device.

[0058] The spur gear oil stirring power loss obtained by the present invention was compared with the numerical simulation results under 25 different gear or lubricating oil parameters. The results are shown in Table 1.

[0059] Table 1 Comparison of power loss results for spur gear oil stirring.

[0060]

[0061]

[0062] As can be seen from the comparison of the results in Table 1, the calculation results of the spur gear churning power loss calculation method of the present invention are close to the numerical simulation results, with the error of the 25 comparative examples within 10%. Therefore, the calculation method of the present invention can accurately predict the churning power loss of spur gears under oil injection lubrication conditions.

[0063] like Figure 4 The following explains the injection angle. The injection angle is defined as 0° when the nozzle is horizontally pointed towards the high-speed gear. For different injection angles, the angle between the nozzle and the horizontal direction is defined as the injection angle φ. It is important to note that to ensure the nozzle is aligned with the gear meshing point, the injection angle must be limited according to the actual situation to ensure that the lubricating oil can be sprayed onto the gear meshing point to achieve the desired lubrication effect.

[0064] A computer device is provided according to an embodiment of the present invention. This 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 various method embodiments described above. Alternatively, when the processor executes the computer program, it implements the functions of each module / unit in the various device embodiments described above.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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 calculating the power loss of spur gear oil churning under oil injection lubrication, characterized in that, Includes the following steps: Calculate the equivalent base circle diameter of a spur gear pair; Calculate the equivalent angular velocity of a spur gear pair; Calculate the Reynolds number of the fluid motion characteristics of spur gears under oil injection lubrication based on the equivalent base circle diameter and equivalent angular velocity of the spur gear pair. Re Specifically, it includes: in, ρ The density of the lubricating oil; ω m The equivalent angular velocity of the spur gear pair; D m The equivalent base circle diameter of the spur gear pair; μ The viscosity of the lubricating oil; Based on the Reynolds number characteristic of fluid motion under spur gear oil injection lubrication, a corresponding spur gear oil churning power loss calculation model is selected to calculate the spur gear oil churning power loss; the spur gear oil churning power loss calculation model is as follows: in, ρ The density of the lubricating oil; ω m The equivalent angular velocity of the spur gear pair; D m The equivalent base circle diameter of the spur gear pair; Q This refers to the oil injection lubrication flow rate; φ This refers to the oil injection lubrication angle; Re The Reynolds number represents the characteristic fluid motion of spur gears under oil-lubricated spray lubrication. B This refers to the gear width.

2. The method for calculating the power loss of spur gear oil churning under oil injection lubrication according to claim 1, characterized in that, The calculation of the equivalent base circle diameter of the spur gear pair D m ,include: In the formula, D p The diameter of the base circle of the driving wheel; D d The base circle diameter of the driven wheel is given.

3. The method for calculating the power loss of spur gear oil churning under oil injection lubrication according to claim 1, characterized in that, The calculation of the equivalent angular velocity of the spur gear pair ω m ,include: in, v e Let be the meshing linear velocity of the gear pair, and ; D m The equivalent base circle diameter of the spur gear pair; n p This refers to the operating speed of the drive wheel; n d The working speed of the driven wheel; D p The diameter of the base circle of the driving wheel; D d The base circle diameter of the driven wheel is given.

4. A calculation system for calculating the power loss of spur gear oil churning under oil injection lubrication in implementing the method of claim 1, characterized in that, include: The base circle diameter calculation module is used to calculate the equivalent base circle diameter of a spur gear pair. The angular velocity calculation module is used to calculate the equivalent angular velocity of a spur gear pair. 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 is used to select the corresponding spur gear churning power loss calculation model based on the Reynolds number of the fluid motion characteristics under spur gear oil injection lubrication, and to calculate the spur gear churning power loss.

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 method as described in any one of claims 1-3.

6. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 1-3.

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