Radial ring groove friction plate selection method and system

Abstract

The application belongs to the technical field of liquid viscosity speed regulation clutch, and particularly discloses a radial annular groove friction plate selection method and system, which collects structural parameters of multiple friction plates; in the radial direction of the end face of each friction plate, a plurality of equally-spaced annular rings are divided; the structural parameters of the friction plates are used to calculate the area ratio of each annular ring on the corresponding friction plate; the torque of each annular ring is calculated according to the area ratio of the annular ring; the torque of the entire friction plate is calculated according to the friction sliding torque of each annular ring; the speed regulation performance of the friction plate is judged by comparing the friction sliding characteristics and the friction sliding torque of different groove forms, and the friction plate with the best speed regulation performance is selected. By adopting the technical scheme, the friction sliding torque of the friction plate with different grooves is accurately calculated, and the friction plate is selected.

Description

Technical Field

[0001] This invention belongs to the field of liquid viscosity speed regulating clutch technology, and relates to a method and system for selecting radial annular groove friction plates. Background Technology

[0002] The viscous speed-regulating clutch utilizes the shear force of the oil film between friction pairs to transmit torque and achieves speed regulation by changing the oil film thickness. It features high speed regulation sensitivity, stepless speed regulation, low starting shock, overload protection, synchronous transmission, and high reliability. Viscous speed-regulating clutches are widely used in mechanical equipment such as fans and water pumps.

[0003] The friction plates of viscous clutches have different groove designs. The arrangement of each groove and the area ratio after removing the grooves significantly affect the friction slip characteristics and speed regulation performance of the friction plates. Currently, the calculation of the friction slip torque of viscous clutch friction plates only considers the ratio of the area after removing the grooves to the total area of ​​the friction plate. This only reflects the influence of groove width on the friction slip torque and fails to truly reflect the impact of different groove designs (e.g., square grooves, radial grooves, circular arc radial grooves, and spiral grooves) on the output friction slip characteristics and friction slip torque. Therefore, it cannot truly distinguish the characteristics of friction plates with different groove designs, cannot accurately test the speed regulation performance of the friction plates, and leads to the inability to accurately select suitable friction plates. Summary of the Invention

[0004] The purpose of this invention is to provide a method and system for selecting radial annular groove friction plates, which can more accurately calculate the friction torque of friction plates with different groove shapes, and facilitate the selection of friction plates with excellent speed regulation performance.

[0005] To achieve the above objectives, the basic solution of the present invention is: a method for selecting a radial annular groove friction plate, comprising the following steps:

[0006] Collect structural parameters of multiple friction plates;

[0007] On the radial direction of the end face of each friction plate, several equally spaced rings are divided;

[0008] Using the structural parameters of the friction plate, calculate the area ratio of each ring on the corresponding friction plate;

[0009] Calculate the torque of each ring based on the area ratio of the rings;

[0010] Calculate the torque of the entire friction plate based on the friction torque of each ring;

[0011] By comparing the friction characteristics and friction torque of different groove types, the speed regulation performance of the friction plate is determined, and the friction plate with the best speed regulation performance is selected.

[0012] The working principle and beneficial effects of this basic scheme are as follows: This invention divides the radial direction into several equally spaced circular rings, calculates the area ratio of each ring, and then accurately determines the friction torque of the entire radial annular groove through discrete area ratios. By analyzing the influence of the area ratio of different groove forms on the friction characteristics and friction torque of the friction plate, a groove form friction plate with better speed regulation performance can be selected. Accurate selection of the required friction plate is achieved, and the operation is simple.

[0013] Furthermore, the structural parameters of the friction plate include the inner diameter r1 of the friction plate, the outer diameter r2 of the friction plate, the central angle θ1 corresponding to the oil groove area of ​​the friction plate, the central angle θ2 corresponding to the boss of the friction plate, the thickness a of the annular groove of the oil groove area of ​​the friction plate along the radial direction, and the thickness b of the boss of the friction plate along the radial direction.

[0014] Obtain the required friction plate parameters for subsequent use.

[0015] Furthermore, the method for calculating the area ratio of each ring on the friction plate is as follows:

[0016] The friction plate is divided into n equally spaced rings, therefore the width of the discrete infinitesimal element is:

[0017]

[0018] Where r1 is the inner diameter of the friction plate and r2 is the outer diameter of the friction plate;

[0019] At radius r i Consider a tiny circular ring with an area dA. tu =r i θ2dr, dA sun =r i (θ1+θ2)dr, where θ1 is the central angle corresponding to the oil groove area of ​​the friction plate, and θ2 is the central angle corresponding to the boss of the friction plate; dA tu When integrating, the area of ​​the boss of the infinitesimal annulus is dA. sun Refers to the total area of ​​the selected infinitesimal annulus;

[0020] For the i-th ring of the friction plate, the following situation applies:

[0021] When r i and r i When all +dr satisfy ∈[r1+mb,r1+m(b+a)], and m=1,2,3..., the area ratio is:

[0022] s=0

[0023] Where a is the thickness of the annular groove in the oil groove area of ​​the friction plate along the radial direction, b is the thickness of the friction plate boss along the radial direction, and m is a positive integer;

[0024] When ri r i When +dr∈[r1+m(b+a),r1+m(b+a)+b], and m=0,1,2..., the area ratio is:

[0025]

[0026] Critical point 1: r i ∈[r1+m(b+a),r1+m(b+a)+b]

[0027] But r i +dr∈[r1+m(b+a)+b,r1+(m+1)(b+a)],m=0,1,2..., the area ratio is:

[0028]

[0029] Where, r i =r1+i·Δr, i=1,2,3...,n;

[0030] Critical point two: r i ∈[r1+mb,r1+m(b+a)], m=1,2,3...,

[0031] But r i +dr∈[r1+m(b+a),r1+m(b+a)+b], the area ratio is:

[0032]

[0033] If we want to find the area ratio of the i-th ring of the friction plate, then

[0034] The area ratio is:

[0035]

[0036] By dividing the friction plate of the viscous clutch into n rings, the area ratio of each ring can be calculated. Using the area ratio, a more accurate friction torque can be obtained.

[0037] Furthermore, based on the area ratio of the rings, the method for calculating the torque of the rings is as follows:

[0038] The friction torque during the mixing phase of the ungrooved friction plate is:

[0039] T = T(λ,μ,p,f,t)

[0040] Where p is the oil film pressure, f is the coefficient of friction, λ is the oil film thickness, t is the temperature, and μ is the viscosity of the lubricating oil;

[0041] The torque T of the i-th ring of the radial annular groove i for:

[0042] T i =s i T(λ,μ,p,f,t)

[0043] Among them, s i Let be the area ratio of the i-th ring.

[0044] The friction torque can be calculated by using the area ratio of each ring, which is simple to operate and easy to use.

[0045] Furthermore, the method for calculating the torque of the entire friction plate is as follows:

[0046] Adding the torques of all the rings on the friction plate together, we obtain the total friction torque T of the entire friction plate:

[0047]

[0048] Where n is the number of annulus, T i Let be the torque of the i-th ring.

[0049] By superimposing the torques of all the rings on the friction plate, the overall friction torque of the friction plate can be calculated more accurately.

[0050] The present invention also provides a radial annular groove friction plate selection system, including a parameter acquisition module, a human-machine interaction module, and a processing module. The parameter acquisition module is used to acquire the structural parameters of the friction plate. The human-machine interaction module is used to receive the structural parameters of multiple friction plates acquired by the parameter acquisition module. The output end of the human-machine interaction module is connected to the processing module. The processing module executes the method described in the present invention to select the friction plate.

[0051] This system utilizes various modules to achieve accurate performance testing of multiple friction plates, which facilitates the selection of friction plates. Attached Figure Description

[0052] Figure 1 This is a schematic flowchart of the radial annular groove friction plate selection method of the present invention;

[0053] Figure 2 This is a schematic diagram of the friction plate structure of the radial annular groove friction plate selection method of the present invention. Detailed Implementation

[0054] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0055] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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. Therefore, they should not be construed as limitations on this invention.

[0056] In the description of this invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0057] This invention discloses a method for selecting radial annular groove friction plates. By discretizing the friction plate, the characteristics of different groove forms are manifested in a smaller area, and the influence of the discrete area ratio on the friction slip torque of the friction plate can be calculated. This is beneficial for selecting friction plates with groove forms that have better speed regulation performance for viscous clutches. Figure 1 As shown, the method for selecting radial annular groove friction plates includes the following steps:

[0058] Collect structural parameters of multiple friction plates; such as Figure 2 As shown, the structural parameters of the friction plate include the inner diameter r1, the outer diameter r2, the central angle θ1 corresponding to the oil groove area of ​​the friction plate, the central angle θ2 corresponding to the boss of the friction plate, the thickness a of the annular groove in the oil groove area of ​​the friction plate along the radial direction, and the thickness b of the boss of the friction plate along the radial direction.

[0059] On the radial side of the end face of each friction plate (i.e., the area between the inner and outer diameters of the friction plate), several equally spaced rings are divided.

[0060] Using the structural parameters of the friction plate, calculate the area ratio of each ring on the corresponding friction plate;

[0061] Calculate the torque of each ring based on the area ratio of the rings;

[0062] Calculate the torque of the entire friction plate based on the friction torque of each ring;

[0063] By comparing the friction characteristics and friction torque of different groove types, the speed regulation performance of the friction plate is determined, and the friction plate with the best speed regulation performance is selected.

[0064] In a preferred embodiment of the present invention, the method for calculating the area ratio of each ring on the friction plate is as follows:

[0065] The friction plate is divided into n equally spaced rings, therefore the width of the discrete infinitesimal element is:

[0066]

[0067] Where r1 is the inner diameter of the friction plate and r2 is the outer diameter of the friction plate;

[0068] At radius r i Consider a tiny circular ring with an area dA. tu =r i θ2dr, dA sun =r i (θ1+θ2)dr, where θ1 is the central angle corresponding to the oil groove area of ​​the friction plate, and θ2 is the central angle corresponding to the boss of the friction plate; dA tu When integrating, the area of ​​the boss of the infinitesimal annulus is dA. sun Refers to the total area of ​​the selected infinitesimal annulus;

[0069] For the i-th ring of the friction plate, the following situation applies:

[0070] When r i and r i When all dr and r satisfy ∈ [r1+mb, r1+m(b+a)], and m = 1, 2, 3..., the area ratio is:

[0071] s=0

[0072] Where a is the thickness of the annular groove in the oil groove area of ​​the friction plate along the radial direction, b is the thickness of the friction plate boss along the radial direction; m is a positive integer, according to r i The value of m is determined by the size of r, and the value of m guarantees that r i Within the interval [r1+mb, r1+m(b+a)], and m has a unique value that is the same as r. i correspond;

[0073] When r i and r i When both +dr satisfy ∈[r1+m(b+a),r1+m(b+a)+b], and m=0,1,2..., the area ratio is:

[0074]

[0075] Critical point (referring to the point where, when dividing a friction pair, part of the infinitesimal circular element is located at the boss position and the other part is located at the groove position): r i ∈[r1+m(b+a),r1+m(b+a)+b]

[0076] But r i +dr∈[r1+m(b+a)+b,r1+(m+1)(b+a)],m=0,1,2..., the area ratio is:

[0077]

[0078] Where, r i =r1+i·Δr, i=1,2,3...,n;

[0079] Critical point two: r i ∈[r1+mb,r1+m(b+a)], m=1,2,3...,

[0080] But r i +dr∈[r1+m(b+a),r1+m(b+a)+b], the area ratio is:

[0081]

[0082] If we want to find the area ratio of the i-th ring of the friction plate, then

[0083] The area ratio is:

[0084]

[0085] In a preferred embodiment of the present invention, the method for calculating the torque of the ring based on the area ratio of the rings is as follows:

[0086] During the mixed friction stage, the depth of the oil grooves in the friction pair is much greater than the thickness of the oil film. The grooved area of ​​the friction pair has lower oil film bearing capacity and oil film torque compared to the non-grooved area. Simultaneously, as the film thickness ratio decreases, the influence of the oil film on the mixed friction characteristics gradually diminishes. Therefore, during the mixed friction stage, the influence of the fluid in the grooved area and the shape of the grooves on the friction characteristics, bearing capacity, and friction torque of the friction pair is ignored. The friction torque of the ungrooved friction plate during the mixed stage is affected by many factors: oil film pressure p, friction coefficient f, oil film thickness λ, temperature t, lubricating oil viscosity μ, etc. The friction torque of the ungrooved friction plate during the mixed stage is:

[0087] T = T(λ,μ,p,f,t)

[0088] Where p is the oil film pressure, f is the coefficient of friction, λ is the oil film thickness, t is the temperature, and μ is the viscosity of the lubricating oil;

[0089] The torque T of the i-th ring of the radial annular groove i for:

[0090] T i =s i T(λ,μ,p,f,t)

[0091] Among them, s i Let be the area ratio of the i-th ring.

[0092] In a preferred embodiment of the present invention, the method for calculating the torque of the entire friction plate is as follows:

[0093] Adding the torques of all the rings on the friction plate together, we obtain the total friction torque T of the entire friction plate:

[0094]

[0095] Where n is the number of annulus, T i Let be the torque of the i-th ring.

[0096] By superimposing the torques of all the rings on the friction plate, the overall friction torque of the friction plate can be calculated more accurately.

[0097] This invention also provides a radial annular groove friction plate selection system, including a parameter acquisition module, a human-machine interface module, and a processing module. The parameter acquisition module is used to acquire the structural parameters of the friction plates. The human-machine interface module is used to receive the structural parameters of multiple friction plates acquired by the parameter acquisition module. The output of the human-machine interface module is connected to the processing module. The processing module executes the method described in this invention to select the friction plates. This system utilizes each module to achieve accurate performance detection of multiple friction plates, facilitating the selection of friction plates.

[0098] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0099] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for selecting radial annular groove friction plates, characterized in that, Includes the following steps: Collect structural parameters of multiple friction plates; On the radial direction of the end face of each friction plate, several equally spaced rings are divided; Using the structural parameters of the friction plate, calculate the area ratio of each ring on the friction plate; the method for calculating the area ratio of each ring on the friction plate is as follows: The friction plate is divided into n equally spaced rings, therefore the width of the discrete infinitesimal element is: ， in, Let be the inner diameter of the friction plate. The outer diameter of the friction plate; In radius Take the area of ​​a tiny annulus at point , , The central angle corresponding to the oil groove area of ​​the friction plate. The central angle corresponding to the friction plate boss; During integration, the area of ​​the boss of the selected infinitesimal annulus is used. The total area of ​​the selected infinitesimal annulus; For the i-th ring of the friction plate, the following situation applies: when , When the area ratio is: ， in, The thickness of the annular groove in the oil groove area of ​​the friction plate along the radial direction. The thickness of the friction plate boss along the radial direction is m, where m is a positive integer; when , When the area ratio is: ； Critical Point 1: , but , The area ratio is: ， in, , ; Critical Point Two: , , but The area ratio is: ， If we want to find the area ratio of the i-th ring of the friction plate, then , , The area ratio is: ； Calculate the torque of each ring based on the area ratio of the rings; Calculate the torque of the entire friction plate based on the friction torque of each ring; By comparing the friction characteristics and friction torque of different groove types, the speed regulation performance of the friction plate is determined, and the friction plate with the best speed regulation performance is selected.

2. The method for selecting radial annular groove friction plates as described in claim 1, characterized in that, The structural parameters of the friction pad include the inner diameter of the friction pad. outer diameter of the friction plate The central angle corresponding to the oil groove area of ​​the friction plate The central angle corresponding to the friction plate boss The thickness of the annular groove in the oil groove area of ​​the friction plate along the radial direction The thickness of the friction pad boss along the radial direction .

3. The method for selecting radial annular groove friction plates as described in claim 1, characterized in that, The method for calculating the torque of a ring based on its area ratio is as follows: The friction torque during the mixing stage of the ungrooved friction plate is: ， in, For oil film pressure, The coefficient of friction, For oil film thickness, For temperature, The viscosity of the lubricating oil; The first radial annular groove Torque of each ring for: ， in, For the first The ratio of the areas of the rings.

4. The method for selecting radial annular groove friction plates as described in claim 1, characterized in that, The method for calculating the torque of the entire friction plate is as follows: The total friction torque of the entire friction plate is obtained by summing the torques of all the rings on the friction plate. : ， in, The number of rings. For the first The torque of a circular ring.

5. A radial annular groove friction plate selection system, characterized in that, The system includes a parameter acquisition module, a human-computer interaction module, and a processing module. The parameter acquisition module is used to acquire the structural parameters of the friction pads. The human-computer interaction module is used to receive the structural parameters of multiple friction pads acquired by the parameter acquisition module. The output end of the human-computer interaction module is connected to the processing module. The processing module executes the method described in any one of claims 1-4 to select the friction pads.

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