Wet clutch friction plate oil groove structure based on depth gradient optimization

Abstract

A wet clutch friction plate oil groove structure based on depth gradient optimization relates to the technical field of wet clutches and comprises a friction product body, a first annular oil groove, a second annular oil groove and a third annular oil groove are sequentially formed in the friction plate body in the radial direction, and a plurality of radial oil grooves distributed in the circumferential direction are formed in the friction plate body in the third annular oil groove. A first V-shaped oil groove is formed between every two adjacent radial oil grooves, the first oil groove and the second oil groove, and a second V-shaped oil groove is formed between every two adjacent radial oil grooves, the second oil groove and the third oil groove. The vertex of the first V-shaped oil groove is located on the first oil groove, two end points of the first V-shaped oil groove are communicated with the intersection point, the vertex of the second V-shaped oil groove is located on the third oil groove, two end points of the second V-shaped oil groove are communicated with the intersection point, and the intersection point is the communication point of the radial oil groove and the second oil groove. The deep oil grooves are formed in the outer ring area so that the heat dissipation efficiency can be improved; a shallow oil groove is adopted in the inner ring area to maintain the structural rigidity, and lubricating oil is guided to flow secondarily so as to further improve the heat exchange effect.

Description

Technical Field

[0001] This invention relates to the field of wet clutch technology, and more specifically to a wet clutch friction plate oil groove structure based on depth gradient optimization. Background Technology

[0002] A wet clutch is a core component of a vehicle's transmission system. It transmits and interrupts power through the engagement and disengagement of friction plates immersed in lubricating oil and their counterpart steel plates. During operation, especially during the engagement and slippage phase, a large amount of frictional heat is generated between the friction pairs, causing the temperature of the friction plates to rise sharply. If this heat cannot be carried away and effectively dissipated by the lubricating oil in time, it will cause thermal degradation of the friction materials, rupture of the lubricating oil film, localized high temperatures, and even thermal warping deformation, seriously affecting the clutch's torque transmission capacity, operational smoothness, and service life.

[0003] To improve heat dissipation and lubrication, existing technologies typically incorporate various types of oil grooves on the surface of friction plates, such as radial straight grooves, spiral grooves, and mesh grooves. However, these traditional designs generally share a common deficiency: the depth of the oil grooves is usually uniform across the entire friction working surface. This uniform depth design fails to adequately consider the uneven heat load distribution during actual operation. Since the linear velocity of the outer ring of the friction plate is much higher than that of the inner ring, its frictional work per unit area and heat generation rate are significantly greater, making it the main high-temperature area and heat dissipation bottleneck of the entire friction pair. Traditional uniform depth oil grooves provide equal oil storage and flow space across the entire working surface, resulting in relatively insufficient cooling oil flow and limited heat dissipation capacity in the high-heat-load outer ring region; while in the low-heat-load inner ring region, the oil groove space may be redundant. Furthermore, some complex groove types (such as dense mesh grooves), while attempting to increase the heat dissipation area, often excessively weaken the friction material matrix, damaging the structural rigidity of the friction plate, which may cause uneven pressure distribution and engagement vibration. Summary of the Invention

[0004] To address the aforementioned technical problems, the present invention aims to propose a wet clutch friction plate oil groove structure based on depth gradient optimization.

[0005] The objective of this invention is achieved through the following technical solution. According to this invention, a wet clutch friction plate oil groove structure based on depth gradient optimization includes a friction plate body. The inner edge of the friction plate body has several splined holes distributed circumferentially. The friction plate body has annular first oil grooves, second oil grooves, and third oil grooves arranged sequentially in the radial direction. The friction plate body inside the third oil groove has multiple radially distributed oil grooves, which connect the first, second, and third oil grooves. A first V-shaped oil groove is provided between two adjacent radial oil grooves, the first oil groove, and the second oil groove; a second V-shaped oil groove is provided between two adjacent radial oil grooves, the second oil groove, and the third oil groove. The vertex of the first V-shaped oil groove is located on the first oil groove, and both its two ends are connected to the intersection point. The vertex of the second V-shaped oil groove is located on the third oil groove, and both its two ends are connected to the intersection point, which is the connection point between the radial oil grooves and the second oil groove.

[0006] Furthermore, the vertices of the first V-shaped oil groove and the second V-shaped oil groove are on the same straight line as the center of the friction plate body.

[0007] Furthermore, the depth of the third oil groove is greater than that of the radial oil groove, the first oil groove, the second oil groove, the first V-shaped oil groove, and the second V-shaped oil groove, and the depth of the radial oil groove and the first oil groove is greater than that of the second oil groove, the first V-shaped oil groove, and the second V-shaped oil groove.

[0008] Furthermore, the depth of the radial oil groove is the same as the depth of the first oil groove.

[0009] Furthermore, the depth of the first oil groove and the radial oil groove is 0.20 mm to 0.30 mm.

[0010] Furthermore, the depth of the third oil tank is 0.40 mm to 0.80 mm.

[0011] Based on the foregoing technical solution, the present invention has the following beneficial effects: (1) The present invention provides a first oil groove, a second oil groove, and a third oil groove with different groove depths along the radial direction of the friction plate body. By increasing the depth of the third oil groove, the lubricating oil storage capacity and flow cross-sectional area of ​​the high-temperature area of ​​the outer ring are directly increased. This allows more cooling oil to be transported and effectively retained in the outer ring area that needs the most cooling, which greatly enhances the heat exchange capacity of the area. A shallower oil groove depth is used in the area where the heat load of the first oil groove is low. While ensuring the basic lubrication and wear debris removal functions, the physical thickness and continuity of the friction material are preserved to the maximum extent. (2) In this invention, the lubricating oil flows through the first oil groove and then flows into the third oil groove along the radial oil groove. The lubricating oil naturally forms a primary flow with the flow rate and velocity gradually increasing from the inside to the outside. When the lubricating oil fills the third oil groove, the lubricating oil will flow into the second oil groove, the first V-shaped oil groove, and the second V-shaped oil groove to form a secondary flow, so as to make the temperature uniformity of the entire friction surface better and further improve the heat dissipation efficiency and lubrication effect.

[0012] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a wet clutch friction plate oil groove structure based on depth gradient optimization according to the present invention.

[0014] Figure 2 This is an isometric side view of a wet clutch friction plate oil groove structure based on depth gradient optimization according to the present invention.

[0015] Reference numerals: 1. Friction plate body; 2. Spline hole; 3. First oil groove; 4. Second oil groove; 5. Third oil groove; 6. Radial oil groove; 7. First V-shaped oil groove; 8. Second V-shaped oil groove; 9. Intersection point. Detailed Implementation

[0016] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings: Please see Figure 1This invention discloses a wet clutch friction plate oil groove structure based on depth gradient optimization, comprising a ring-shaped friction plate body 1. The inner edge of the friction plate body has several splined holes 2 distributed circumferentially, used to engage with splines on the clutch hub to achieve circumferential positioning and torque transmission. The friction plate body has annular first oil grooves 3, second oil grooves 4, and third oil grooves 5 arranged sequentially in the radial direction, with the depth of the third oil groove 5 greater than the depths of the first and second oil grooves 3 and 4. Specifically, the depth of the third oil groove is 0.40mm to 0.80mm, and the depth of the first oil groove is 0.20mm to 0.30mm. In this embodiment, the depth of the first oil groove is 0.2mm, and the depth of the third oil groove is 0.4mm. Inside the third oil groove, the friction plate body has multiple radially distributed oil grooves 6, which connect the first, second, and third oil grooves. In this embodiment, the depth of the radial oil grooves is the same as the depth of the first oil groove. A first V-shaped oil groove 7 is provided between two adjacent radial oil grooves, the first oil groove, and the second oil groove; a second V-shaped oil groove 8 is provided between two adjacent radial oil grooves, the second oil groove, and the third oil groove. Specifically, the vertex of the first V-shaped oil groove is located on the first oil groove, and both ends of the first V-shaped oil groove are connected to the intersection point 9. The vertex of the second V-shaped oil groove is located on the third oil groove, and both ends of the second V-shaped oil groove are connected to the intersection point 9. The intersection point 9 is the connection point between the radial oil groove and the second oil groove. The vertex of the first V-shaped oil groove can be located at any position on the third oil groove, and the vertex of the second V-shaped oil groove can be located at any position on the first oil groove. Preferably, in this embodiment, the corresponding vertices of the first V-shaped oil groove and the second V-shaped oil groove are on the same straight line as the center of the friction plate body. In this embodiment, the groove depth of the three oil grooves is greater than that of the radial oil groove, the first oil groove, the second oil groove, the first V-shaped oil groove, and the second V-shaped oil groove, and the groove depth of the radial oil groove and the first oil groove is greater than that of the second oil groove, the first V-shaped oil groove, and the second V-shaped oil groove.

[0017] The working principle of the wet clutch friction plate oil groove structure based on depth gradient optimization of the present invention is as follows: When a wet clutch is engaged, the lubricating oil flows from the inner edge of the friction plate's bore to the outer edge under centrifugal force. The lubricating oil first enters and fills the first oil groove through the radial groove. Because the volume of this groove is relatively small, the lubricating oil flows quickly, providing basic lubrication and initial cooling to the first oil groove area. Subsequently, the lubricating oil enters and fills the third oil groove along the radial groove; this is the first flow. Since the depth of the third oil groove is greater than the depths of the first, second, first V-shaped, and second V-shaped oil grooves, the flow pattern changes after the lubricating oil fills the third groove and enters the second, first, and second V-shaped oil grooves, forming a secondary flow. The significant difference in groove depth results in two... Key effects: First, it significantly increases the oil storage capacity in the outer ring area where the third oil groove is located, allowing more cooling medium to remain in this high-temperature zone. Second, the lubricating oil undergoes a secondary flow after its initial flow, significantly increasing the flow cross-sectional area and reducing flow resistance, thus increasing the flow rate, velocity, and heat exchange. These two factors combined greatly enhance the heat dissipation capacity of the high-heat-load area in the outer ring. The lubricating oil after the secondary flow can quickly remove the large amount of frictional heat generated by the high linear velocity in this area. At the same time, the solid material of the first oil groove and the friction plate body retained in the inner ring ensures that this area has sufficient structural rigidity and compressive strength during engagement, which is conducive to uniform pressure distribution and smooth torque transmission.

[0018] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention, as long as they do not depart from the design and scope of the technical solutions of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A wet clutch friction plate oil groove structure based on depth gradient optimization, comprising a friction plate body (1), wherein the inner hole edge of the friction plate body is provided with a plurality of spline holes (2) distributed circumferentially, characterized in that: The friction plate body is provided with annular first oil groove (3), second oil groove (4) and third oil groove (5) in the radial direction. The friction plate body inside the third oil groove is provided with multiple radial oil grooves (6) distributed in the circumferential direction. The radial oil grooves connect the first oil groove, the second oil groove and the third oil groove. A first V-shaped oil groove (7) is provided between two adjacent radial oil grooves, the first oil groove and the second oil groove. A second V-shaped oil groove (8) is provided between two adjacent radial oil grooves, the second oil groove and the third oil groove. The vertex of the first V-shaped oil groove is located on the first oil groove and its two ends are connected to the intersection point (9). The vertex of the second V-shaped oil groove is located on the third oil groove and its two ends are connected to the intersection point. The intersection point (9) is the connection point between the radial oil groove and the second oil groove.

2. The wet clutch friction plate oil groove structure based on depth gradient optimization according to claim 1, characterized in that: The vertices of the first and second V-shaped oil grooves are on the same straight line as the center of the friction plate body.

3. The wet clutch friction plate oil groove structure based on depth gradient optimization according to claim 1, characterized in that: The depth of the third oil groove is greater than that of the radial oil groove, the first oil groove, the second oil groove, the first V-shaped oil groove, and the second V-shaped oil groove, and the depth of the radial oil groove and the first oil groove is greater than that of the second oil groove, the first V-shaped oil groove, and the second V-shaped oil groove.

4. The wet clutch friction plate oil groove structure based on depth gradient optimization according to claim 3, characterized in that: The depth of the radial oil groove is the same as the depth of the first oil groove.

5. A wet clutch friction plate oil groove structure based on depth gradient optimization according to any one of claims 1-4, characterized in that: The depth of the first oil groove and the radial oil groove is 0.20 mm to 0.30 mm.

6. A wet clutch friction plate oil groove structure based on depth gradient optimization according to any one of claims 1-4, characterized in that: The depth of the third oil tank is 0.40 mm to 0.80 mm.

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