CN115962233A - Microtexturing of friction elements - Google Patents
Microtexturing of friction elements Download PDFInfo
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- CN115962233A CN115962233A CN202211643924.4A CN202211643924A CN115962233A CN 115962233 A CN115962233 A CN 115962233A CN 202211643924 A CN202211643924 A CN 202211643924A CN 115962233 A CN115962233 A CN 115962233A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The friction element is arranged on a power input shaft of a wet clutch, is of an annular structure, and is provided with a plurality of grooves, and the depth of each groove is smaller than the thickness of the friction element; the perpendicular projection of a plurality of said grooves towards the friction element falls completely on said friction element without the edges of said grooves overlapping. Through this disclosed processing scheme, make the recess quantity of different positions on the friction element different, a plurality of recesses form microtexture on the friction element surface, changed the regional actual area of contact of friction, change the coefficient of friction in the different regions of friction element, and then improve the inhomogeneous problem of friction heat production that leads to because the linear velocity difference on the different radiuses, the recess can play the effect of storing the abrasive dust in friction process simultaneously, reaches the target that reduces friction element wearing and tearing, promotes friction element life.
Description
Technical Field
The invention relates to the field of friction members and the technical field of clutches, in particular to a friction element microtexture.
Background
The multi-plate clutch is a key part for controlling and transmitting power in the processes of gear shifting, speed changing and hydraulic-mechanical mode conversion of a vehicle transmission system, and for a wet multi-plate clutch of an automobile, a power transmission route can be changed by effectively and reliably controlling the engaging and disengaging processes of the multi-plate clutch, so that multi-gear high-efficiency transmission is realized, and the driving maneuverability of the vehicle is improved.
The friction elements of a multiple disc clutch are friction plates and steel plates, which must undergo a short slip process during a shift operation. If the clutch is overloaded or abnormally engaged, a long-time slipping process can occur, slipping can cause the temperature of the friction element to be rapidly increased, but under the condition that the friction element rotates at a high speed, the linear velocity of the friction element close to the inner diameter position is small, and the linear velocity of the friction element close to the outer diameter position is large, so that the heat generated by friction heat generation at the outer diameter position is larger than that at the inner diameter position during friction, the radial uneven temperature rise can cause the annular thin plate structure to generate in-plane bending moment, internal stress and thermal warping of the friction element are caused, and the thermal warping deformation of the friction element can reduce the engagement and disengagement performance of the multi-plate clutch and even cause transmission failure.
The conventional multi-plate clutch is usually cooled by injecting lubricating oil from an internal oil passage of a shaft to the inner diameter of a friction element, and although the overall temperature of the friction element can be reduced, the radial temperature distribution of the friction element is often deteriorated by the non-uniform cooling method. In order to reduce the radial non-uniformity, a design method of radial temperature rise of the friction element needs to be studied in depth, the design of the surface microtexture on the powder metallurgy lining layer of the friction element is a feasible method, the surface microtexture technology is widely applied to change the material characteristics and the friction characteristics, increase the fatigue strength, the corrosion resistance, the abrasion resistance, the biological hydrophobicity and the bearing capacity, and the preparation of the microtexture on the surface of the friction element can change the average friction coefficient, slow down the abrasion and stabilize the friction process.
Disclosure of Invention
In view of the above, embodiments of the present disclosure provide a friction element microtexturing, which at least partially solves the problem of uneven radial temperature rise of the friction element in the prior art.
The embodiment of the disclosure provides a friction element microtexture, which comprises a friction element, wherein the friction element is mounted on a power input shaft of a wet clutch, the friction element is of an annular structure, a plurality of grooves are distributed on the surface of the friction element, and the depth of each groove is smaller than the thickness of the friction element; the perpendicular projection of a plurality of said grooves towards the friction element falls completely on said friction element without the edges of said grooves overlapping.
Preferably, the number of grooves is arranged in a gradient along the radial direction of the friction element.
Preferably, a plurality of said grooves are orthogonally distributed on the surface of said friction element, with a transverse spacing c between adjacent grooves 1 ，c 1 The value range of (a) is 5mm-20mm, and the longitudinal distance between adjacent grooves is c 2 ，c 2 The value range of (A) is 5mm-20mm.
Preferably, the grooves are radially distributed on the surface of the friction element, the interval angle between two adjacent radial lines where the grooves are located is theta, the value range of theta is 5-35 degrees, and the radial distance between the grooves along the friction element is c 3 ，c 3 The value range of (A) is 5mm-20mm.
Preferably, a plurality of grooves are arranged on the surface of the friction element along concentric circles, and the radius difference between two adjacent concentric circles where the grooves are located is c 4 ，c 4 The value range of (1) is 5mm-20mm, the ratio of the number of grooves on the same concentric circle to the radius of the concentric circle is rho, and the value range of rho is 0.05/mm-0.50/mm.
Preferably, the groove is a cylindrical groove, a vertical projection of the cylindrical groove towards the friction element is circular, the diameter of the cylindrical groove is phi, the value range of the phi is 1mm-10mm, and the depth of the cylindrical groove is h 1 ，h 1 The value of (a) is 100-500 μm.
Preferably, the groove is a square groove, a vertical projection of the square groove towards the friction element is a rectangle, a first side length of the square groove is a, and a is takenThe value range is 1mm-10mm, the second side length of the square groove is b, the value range of b is 1mm-10mm, and the depth of the square groove is h 2 ，h 2 The value of (a) is 100-500 μm.
Preferably, the groove is a regular triangular groove, a vertical projection of the regular triangular groove towards the friction element is a regular triangle, the side length of the regular triangular groove is d, the value range of d is 1mm-10mm, and the depth of the regular triangular groove is h 3 ，h 3 The value of (a) is 100-500 μm.
The friction element microtexture in the embodiment of the disclosure comprises a friction element with a plurality of grooves distributed on the surface, the number of the grooves is in gradient distribution along the radial direction of the friction element, through the scheme of the disclosure, the number of the grooves at different radius positions on the friction element is different, the grooves form microtexture on the surface of the friction element, the actual contact area of a friction area is changed, the friction coefficient of different areas of the friction element is changed, the friction process is stabilized, the problem of uneven friction heat generation caused by different linear speeds on different radii is further improved, meanwhile, the grooves can play a role in storing abrasive dust in the friction process, and the purposes of slowing down abrasion and prolonging the service life of the friction element are achieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required to be used in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic overall structure diagram provided in embodiment 1 of the present disclosure;
FIG. 2 is an enlarged view taken at A in FIG. 1;
FIG. 3 isbase:Sub>A cross-sectional view taken at A-A of FIG. 2;
FIG. 4 is a schematic illustration of the microtextured cylindrical grooves of a friction element provided in example 1 of the present disclosure;
fig. 5 is a schematic overall structure diagram provided in embodiment 2 of the present disclosure;
FIG. 6 is an enlarged view at B in FIG. 5;
fig. 7 is a schematic view of the overall structure provided in embodiment 3 of the present disclosure;
FIG. 8 is an enlarged view taken at D in FIG. 7;
fig. 9 is a schematic structural diagram of different groove densities provided in embodiment 3 of the present disclosure;
fig. 10 is a schematic view of the overall structure provided in embodiment 4 of the present disclosure;
FIG. 11 is a cross-sectional view taken at B-B of FIG. 10;
fig. 12 is a schematic view of the overall structure provided in embodiment 5 of the present disclosure;
fig. 13 is a cross-sectional view at C-C in fig. 12.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the disclosure, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present disclosure, and the drawings only show the components related to the present disclosure rather than the number, shape and size of the components in actual implementation, and the type, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.
In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.
As shown in fig. 1 to 4, the invention provides an embodiment 1 of a friction element microtexture, including a friction element 1, the friction element 1 is mounted on a power input shaft of a wet clutch, the friction element 1 is of an annular structure, a plurality of grooves 2 are distributed on the surface of the friction element 1, the depth of the grooves 2 is smaller than the thickness of the friction element 1, that is, the grooves 2 are arranged so as not to cause the friction element 1 to be penetrated, thereby ensuring the structural strength of the friction element 1; the perpendicular projection of the plurality of grooves 2 towards the friction element 1 falls completely on the friction element 1 without the edges of the grooves 2 overlapping in order to control the dimensional accuracy of the individual grooves 2.
The quantity of recess 2 sets up along friction element 1 radial gradient, make the recess 2 quantity of different radius positions on the friction element 1 different, a plurality of recesses 2 form little texture on friction element 1 surface, the regional actual area of contact of friction has been changed, change the coefficient of friction in the different regions of friction element 1, the steady friction process, and then improve the not even problem of friction heat production that leads to because the line speed difference on the different radii, the recess can play the effect of storing the abrasive dust in the friction process simultaneously, reach and reduce friction element wearing and tearing, promote friction element life's target, set up through the gradient distribution to recess 2 quantity, adjust the temperature of friction element 1 different positions, avoid friction element 1 because of each position temperature inequality leads to warping.
On the other hand, when lubricating the friction element 1 with lubricating oil, oil can be stored in the groove 2, better lubricating effect is provided in the friction process, and particles generated by abrasion can be collected into the groove 2, so that the friction process is stabilized, and the surface abrasion of the friction element 1 is reduced.
A plurality of grooves 2 are orthogonally distributed on the surface of the friction element 1, and the transverse distance between the adjacent grooves 2 is c 1 ，c 1 Is 5mm-20mm, and the longitudinal distance between adjacent grooves 2 is c 2 ，c 2 When the transverse distance c is in the range of 5mm-20mm 1 And a longitudinal distance c 2 When the value range of (a) is 5-20 mm, the distance and the friction coefficient are in positive correlation, the larger the distance is, the larger the friction coefficient is, and the transverse distance c is 1 And a longitudinal distance c 2 Using a specific value range to make the transverse spacing c 1 And a longitudinal distance c 2 After the numerical value is changed, the stability of the friction coefficient can still be kept, and the stable friction process is facilitated.
Example 2 of microtexturing of the Friction element, as shown in FIGS. 5 and 6, is used in combination withThe difference of embodiment 1 is that a plurality of grooves 2 are radially distributed on the surface of the friction element 1, the interval angle between two adjacent radial lines where the grooves 2 are located is theta, the value range of theta is 5-35 degrees, and the radial distance between the grooves 2 along the friction element 1 is c 3 ，c 3 The value of (a) is in the range of 5mm to 20mm, theta and c 3 The friction element 1 can realize gradient distribution of the number of the radial grooves 2 by adopting different values, namely the gradient distribution of the friction coefficient can be changed, when the value range of the interval angle theta is 5mm-20mm, the interval angle theta and the friction coefficient are in positive correlation, the friction coefficient is larger when the interval angle theta is larger, the interval angle theta is in a specific value range, the stability reduction of the friction coefficient caused by the change of the angle of the interval angle theta is avoided, and the friction process is favorably stabilized.
Example 3 of microtexturing of friction element, as shown in fig. 7 to 9, differs from example 1 in that a plurality of grooves 2 are arranged on the surface of the friction element 1 along concentric circles, and the difference of the radii of two adjacent concentric circles where the grooves 2 are located is c 4 ，c 4 The value range of (a) is 5mm-20mm, the ratio of the number of the grooves 2 positioned on the same concentric circle to the radius of the positioned concentric circle is rho, the value range of rho is 0.05/mm-0.50/mm, c 4 And rho, the gradient distribution of the number of the grooves 2 in the radial direction of the friction element 1 is realized by adopting different values, namely the gradient distribution of the friction coefficient can be changed, the concentric circle distribution has better uniformity, and the surface of the friction element 1 can obtain more stable friction coefficient change.
Example 4 of microtexturing of the friction element, as shown in fig. 10 and 11, differs from example 1 in that the grooves 2 are square grooves, the vertical projection of the square grooves towards the friction element 1 is rectangular, the first side length of the square grooves is a, the range of a is 1mm to 10mm, the second side length of the square grooves is b, the range of b is 1mm to 10mm, and the depth of the square grooves is h 2 ，h 2 The value of (a) is in the range of 100 to 500. Mu.m, when a, b and h 2 When the value of (b) is within the range of values, the side lengths a, b and the depth h 2 The larger the numerical value of (a), the larger the friction coefficient, and the depth h of the square groove is avoided 2 When the numerical value exceeds the value range, the extrusion cavitation phenomenon causes the difficulty in discharging the lubricating oilSpecific value range is favorable to coefficient of friction stability, and then the steady friction process, and, the square trough can change the proportion on two limits comparatively easily in actual design process, obtain more forms of arranging, thereby obtain the required target under the designer's special circumstances more easily, simultaneously when the square trough is being close the square, under the same size condition, compare with circular and triangle-shaped and can possess bigger area and volume, can store more lubricating oil and grit abrasive dust, and then promote friction process stability and life of friction element 1.
Example 5 of the microtexture of the friction element, as shown in fig. 12 and 13, differs from example 1 in that the grooves 2 are regular triangular grooves, the vertical projection of the regular triangular grooves toward the friction element 1 is a regular triangle, the side length of the regular triangular grooves is d, the range of d is 1mm to 10mm, and the depth of the regular triangular grooves is h 3 ，h 3 The value range of the regular triangular groove is 100-500 microns, so that the problem that the friction coefficient of the edge of the regular triangular groove is unstable due to a micro-cutting effect is avoided, on the other hand, the regular triangular groove is in a regular triangle shape due to the fact that the vertical projection of the regular triangular groove is, more arrangement forms can be generated due to the angles of the three sides of the regular triangular groove relative to the circle center when the regular triangular groove is arranged on a friction element, under the condition of the same size, the storage effect of the regular triangular groove on lubricating oil and abrasive grain abrasive dust due to the shape particularity is weakened, but the stability of the friction coefficient of the regular triangular groove is not greatly influenced, and the use requirement of the lubricating oil with high viscosity is met.
In addition, the present disclosure may also have the following implementation:
(1) A friction element microtexturing, comprising:
the friction element (1) is mounted on a power input shaft of a wet clutch, the friction element (1) is of an annular structure, a plurality of grooves (2) are distributed on the surface of the friction element (1), and the depth of each groove (2) is smaller than the thickness of the friction element (1);
the vertical projection of a plurality of grooves (2) towards the friction element (1) completely falls on the friction element (1) and the edges of the grooves (2) do not overlap.
(2) The friction element microtexture according to (1), characterized in that: the number of the grooves (2) is arranged along the radial gradient of the friction element (1).
(3) The friction element microtexturing according to (2), characterized in that: a plurality of grooves (2) are orthogonally distributed on the surface of the friction element (1), and the transverse distance between the adjacent grooves (2) is c 1 ，c 1 The value range of (2) is 5mm-20mm, and the longitudinal distance between adjacent grooves (2) is c 2 ，c 2 The value range of (A) is 5mm-20mm.
(4) The friction element microtexturing according to (2), characterized in that: the grooves (2) are radially distributed on the surface of the friction element (1), the interval angle between two adjacent radial lines where the grooves (2) are located is theta, the value range of theta is 5-35 degrees, and the radial distance between the grooves (2) along the friction element (1) is c 3 ，c 3 The value range of (A) is 5mm-20mm.
(5) The friction element microtexturing according to (2), characterized in that: the grooves (2) are arranged on the surface of the friction element (1) along concentric circles, and the radius difference of two adjacent concentric circles where the grooves (2) are located is c 4 ，c 4 The value range of (2) is 5mm-20mm, the ratio of the number of the grooves (2) on the same concentric circle to the radius of the concentric circle is rho, and the value range of rho is 0.05/mm-0.50/mm.
(6) The friction element microtexturing according to (1), characterized in that: the groove (2) is a cylindrical groove, the vertical projection of the cylindrical groove towards the friction element (1) is circular, the diameter of the cylindrical groove is phi, the value range of phi is 1mm-10mm, and the depth of the cylindrical groove is h 1 ，h 1 The value of (a) is 100-500 μm.
(7) The friction element microtexturing according to (1), characterized in that: the groove (2) is a square groove, the vertical projection of the square groove towards the friction element (1) is a rectangle, the first side length of the square groove is a, the value range of a is 1-10 mm, the second side length of the square groove is b, the value range of b is 1-10 mm, and the depth of the square groove is h 2 ，h 2 The value of (a) is 100-500 μm.
(8) The friction element microtexturing according to (1), characterized in that: the groove (2) is a regular triangular groove, the vertical projection of the regular triangular groove towards the friction element (1) is a regular triangle, the side length of the regular triangular groove is d, the value range of d is 1-10 mm, and the depth of the regular triangular groove is h 3 ，h 3 The value of (a) is 100-500 μm.
The above is only a specific embodiment of the present disclosure, but the scope of the present disclosure is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present disclosure should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (8)
1. A friction element microtexturing, comprising:
the friction element (1) is mounted on a power input shaft of a wet clutch, the friction element (1) is of an annular structure, a plurality of grooves (2) are distributed on the surface of the friction element (1), and the depth of each groove (2) is smaller than the thickness of the friction element (1);
the vertical projection of a plurality of grooves (2) towards the friction element (1) completely falls on the friction element (1) and the edges of the grooves (2) do not overlap.
2. The friction element microtexturing according to claim 1, characterized in that: the number of the grooves (2) is arranged along the radial gradient of the friction element (1).
3. The friction element microtexture of claim 2, wherein: a plurality of grooves (2) are orthogonally distributed on the surface of the friction element (1), and the transverse distance between the adjacent grooves (2) is c 1 ，c 1 The value range of (2) is 5mm-20mm, and the longitudinal distance between adjacent grooves (2) is c 2 ，c 2 The value range of (A) is 5mm-20mm.
4. According to claimThe friction element microtexture of claim 2, wherein: the grooves (2) are radially distributed on the surface of the friction element (1), the interval angle between two adjacent radial lines where the grooves (2) are located is theta, the value range of theta is 5-35 degrees, and the radial distance between the grooves (2) along the friction element (1) is c 3 ，c 3 The value range of (A) is 5mm-20mm.
5. The friction element microtexturing according to claim 2, characterized in that: the grooves (2) are arranged on the surface of the friction element (1) along concentric circles, and the radius difference of two adjacent concentric circles where the grooves (2) are located is c 4 ，c 4 The value range of (2) is 5mm-20mm, the ratio of the number of the grooves (2) on the same concentric circle to the radius of the concentric circle is rho, and the value range of rho is 0.05/mm-0.50/mm.
6. The friction element microtexturing according to claim 1, characterized in that: the groove (2) is a cylindrical groove, the vertical projection of the cylindrical groove towards the friction element (1) is circular, the diameter of the cylindrical groove is phi, the value range of phi is 1mm-10mm, and the depth of the cylindrical groove is h 1 ，h 1 The value of (a) is 100-500 μm.
7. The friction element microtexturing according to claim 1, characterized in that: the groove (2) is a square groove, the vertical projection of the square groove towards the friction element (1) is a rectangle, the first side length of the square groove is a, the value range of a is 1-10 mm, the second side length of the square groove is b, the value range of b is 1-10 mm, and the depth of the square groove is h 2 ，h 2 The value of (a) is 100-500 μm.
8. The friction element microtexturing according to claim 1, characterized in that: the groove (2) is a regular triangular groove, the vertical projection of the regular triangular groove towards the friction element (1) is a regular triangle, the side length of the regular triangular groove is d, the value range of d is 1-10 mm, and the depth of the regular triangular groove is h 3 ，h 3 The value of (a) is 100-500 μm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211643924.4A CN115962233A (en) | 2022-12-20 | 2022-12-20 | Microtexturing of friction elements |
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| CN202211643924.4A CN115962233A (en) | 2022-12-20 | 2022-12-20 | Microtexturing of friction elements |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116796433A (en) * | 2023-06-21 | 2023-09-22 | 北京理工大学 | Friction plate surface micro-texture design method and system for wet clutch |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116796433A (en) * | 2023-06-21 | 2023-09-22 | 北京理工大学 | Friction plate surface micro-texture design method and system for wet clutch |
| CN116796433B (en) * | 2023-06-21 | 2024-05-24 | 北京理工大学 | Friction plate surface micro-texture design method and system for wet clutch |
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