CN111486183A - Wet-type multiplate formula clutch of shifting - Google Patents

Abstract

The invention provides a wet-type multi-plate type gear shifting clutch which comprises a cylinder sleeve, wherein a piston and a pressure plate are arranged in the cylinder sleeve, a plurality of dual steel plates and a plurality of friction plates are arranged between the piston and the pressure plate, the dual steel plates and the friction plates are alternately arranged, the friction plates comprise a first friction plate and a second friction plate, a first arc groove is arranged on each of two sides of the first friction plate, a second arc groove is arranged on each of two sides of the second friction plate, the first friction plate is arranged at the middle position in the axial direction of the clutch along the direction from the piston to the pressure plate, the second friction plate is arranged on each of two sides of the first friction plate, and the area proportion of the first arc groove to the first friction plate is smaller than the area proportion of the second arc groove. The invention enables the clutch to obtain excellent friction torque, lower temperature rise and lower abrasion by quantitatively changing the areas of the circular arc grooves of the friction plates at different axial positions, prolongs the service life of a friction element and improves the reliability of the clutch.

Description

A wet multi-plate shift clutch

technical field

The present invention relates to the technical field of clutches, in particular to a wet multi-plate shift clutch.

Background technique

In the integrated transmission of heavy vehicles, the equipment or element most prone to failure and damage is the wet clutch. The main reason for clutch failure is that the temperature between the friction pairs is too high, which leads to warping deformation or wear failure of the friction elements. The friction performance of the friction element is directly determined by the selected friction material, and is also affected by the structure of the friction element, operating parameters, flow and temperature of the lubricating oil. At present, most researchers are developing new friction materials to improve the friction and wear performance of clutches, thereby reducing the engagement time and wear rate of clutches.

However, the heat dissipation and heat generation at different axial positions of the multi-plate clutch are inconsistent, which leads to obvious differences in the friction and wear characteristics of the friction elements at different positions. Because the friction elements in the middle position of the multi-disc clutch system have poor heat dissipation conditions and generate more heat, thermal buckling and wear failure are most likely to occur, resulting in the failure of the entire clutch, which in turn affects the reliability of the transmission system and the safety of the entire vehicle. sex.

The above deficiencies need to be improved.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a wet multi-plate shift clutch, which is used to solve the technical problem that the friction element in the middle position of the existing multi-plate clutch is easy to fail, which leads to the shortening of the service life of the clutch.

In order to solve the above-mentioned technical problems, the technical scheme adopted in the present invention is as follows:

A wet multi-plate shift clutch is characterized in that it includes a cylinder liner, a piston and a pressure plate are arranged in the cylinder liner, and a plurality of paired steel plates and a plurality of friction plates are arranged between the piston and the pressure plate, The pair of steel plates and the friction plates are alternately arranged, and the friction plates include a first friction plate and a second friction plate. Both sides of the friction plate are provided with second arc grooves,

Along the direction from the piston to the pressure plate, the first friction plate is arranged in the middle position of the clutch axial direction, the second friction plate is arranged on both sides of the first friction plate, and the first circle The ratio of the area of the arc groove to the area of the first friction plate is smaller than the ratio of the area of the second circular arc groove to the area of the second friction plate.

The present invention according to the above solution is characterized in that the quantity ratio of the first friction plate to the second friction plate is 1 to 2, and the second friction plate is evenly arranged on both sides of the first friction plate .

The present invention according to the above solution is characterized in that the area of the first arc groove accounts for 30% to 40% of the area of the first friction plate, and the area of the second arc groove accounts for the 45% to 55% of the area of the second friction plate.

Further, the area of the first arc groove accounts for 35% of the area of the first friction plate, and the area of the second arc groove accounts for 50% of the area of the second friction plate.

Further, the width of the first circular arc groove is 0.8 mm to 1.2 mm, and the width of the second circular arc groove is 1.3 mm to 1.7 mm.

Further, the width of the first circular arc groove is 1 mm, and the width of the second circular arc groove is 1.5 mm.

The present invention according to the above solution is characterized in that both the first circular arc groove and the second circular arc groove are 45° equally divided double circular arc grooves.

The present invention according to the above solution is characterized in that the pair of steel sheets is a straight steel sheet.

The invention according to the above solution is characterized in that a limit snap ring is arranged in the groove of the cylinder liner, and the limit snap ring is connected to the pressing plate.

The present invention according to the above scheme is characterized in that the pair of steel plates is circumferentially connected to the cylinder liner, and the friction plate is connected to the input gear.

The beneficial effects of the present invention are as follows:

The invention quantitatively changes the arc groove area of the friction plates at different axial positions, so that the clutch can obtain the best comprehensive performance, the friction plates in the middle position improve the heat load environment in the middle of the clutch, and the friction plates on both sides of the clutch are used to improve the heat load environment of the clutch. Improve the friction torque of the clutch, this combination enables the clutch to obtain excellent friction torque, lower temperature rise, lower wear, improve the service life of friction elements, improve the reliability of the clutch, and even improve the transmission system and vehicle safety.

Description of drawings

Fig. 1 is the structural representation of the present invention;

2 is a schematic diagram of the arrangement of friction elements of the present invention;

Fig. 3 is the front view of the friction plate of the present invention;

Fig. 4 is the side view of the friction plate of the present invention;

In the figure, 1. Piston; 2. Oil cylinder; 3. Cylinder liner; 4. Dual steel plate; 5. Friction plate; 5A, First friction plate; 5B, Second friction plate; 6. Pressure plate; 7. Limit snap ring; 501, arc groove; 502, friction material layer.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

As shown in FIG. 1 and FIG. 2 , the present invention provides a wet multi-plate shift clutch, which includes a cylinder liner 3 , a piston 1 and a pressure plate 6 are arranged in the cylinder liner 3 , and a plurality of pairs are arranged between the piston 1 and the pressure plate 6 The steel sheet 4 and a plurality of friction sheets 5 are arranged alternately, and the pair of steel sheets 4 and the friction sheets 5 are alternately arranged. The two sides of the friction sheet 5 are provided with arc grooves 501 , and the pair of steel sheets 4 are straight steel sheets. The friction plate 5 is divided into two types, including a first friction plate 5A and a second friction plate 5B. The first circular arc groove is provided on both sides of the first friction plate 5A, and the second friction plate 5B is provided on both sides with a second friction plate. Arc groove. Along the direction from the piston 1 to the pressure plate 6, the first friction plate 5A is arranged in the middle position of the clutch axial direction, the second friction plate 5B is evenly arranged on both sides of the first friction plate 5A, and the area of the first arc groove is The area ratio of the first friction plate 5A is smaller than the area ratio of the second arc groove to the second friction plate 5B. The invention quantitatively changes the arc groove area of the friction plates at different axial positions, so that the clutch can obtain the best comprehensive performance, the friction plates in the middle position improve the heat load environment in the middle of the clutch, and the friction plates on both sides of the clutch are used to improve the heat load environment of the clutch. Improve the friction torque of the clutch, this combination can not only make the clutch obtain excellent friction torque, lower temperature rise, lower wear, prolong the service life of the clutch, improve the reliability of the clutch, and even improve the transmission. System and vehicle safety.

In an embodiment of the present invention, the number ratio of the first friction plate 5A to the second friction plate 5B is 1:2. Specifically, when the clutch is a clutch with three friction plates 5, the number of the first friction plate 5A is one, the number of the second friction plate 5B is two, and the arrangement of the friction elements is 1-4-5B -4-5A-4-5B-6; when the clutch is a clutch with six friction plates 5, the number of the first friction plate 5A is 2, the number of the second friction plate 5B is 4, and the number of friction elements The layout is 1-4-5B-4-5B-4-5A-4-5A-4-5B-4-5B-6, and so on. The above-mentioned friction plate arrangement enables the clutch to obtain the best overall performance.

As shown in FIG. 3-FIG. 4, in an embodiment of the present invention, the arc grooves 501 are arranged on the friction material layers 502 on both sides of the friction plate 3, and the arc grooves 501 are 45° equally divided double arc grooves The groove, that is, the angle between the two arc grooves is divided into 45° and 135°.

In an embodiment of the present invention, the area of the first arc groove accounts for 30% to 40% of the area of the first friction plate 5A, and the area of the second arc groove accounts for 45% of the area of the second friction plate 5B. ~55%. This design enables the first friction plate 5A to have excellent comprehensive performance, moderate friction torque, good heat dissipation performance, and low surface temperature. This kind of friction plate is not easy to wear, so it is placed in the middle of the clutch axial direction; while the second friction plate 5B can generate a large friction torque and has excellent heat dissipation performance, but the specific pressure in the contact area is too large, resulting in serious wear, so it is placed near the piston 1 and the pressure plate 6.

Preferably, the area of the first arc groove accounts for 35% of the area of the first friction plate 5A, and the area of the second arc groove accounts for 50% of the area of the second friction plate 5B. When the area of the first arc groove accounts for 35% of the area of the first friction plate 5A, the effect of improving the heat load environment in the middle of the clutch through the first friction plate 5A is the best; when the area of the second arc groove accounts for When the area of the second friction plate 5B is 50%, the effect of increasing the friction torque of the clutch through the second friction plate 5B on both sides of the clutch is the best.

Further, when the area of the first circular arc groove accounts for 30% to 40% of the area of the first friction plate 5A, the width of the first circular arc groove is 0.8 mm to 1.2 mm; When the area of the second friction plate 5B accounts for 45% to 55% of the area of the second friction plate 5B, the width of the second arc groove is 1.3 mm to 1.7 mm. Preferably, when the area of the first arc groove accounts for 35% of the area of the first friction plate 5A, the width of the first arc groove is 1 mm. Under this design, the first friction plate 5A can improve the friction of the middle of the clutch. The effect of heat load environment is the best; when the area of the second arc groove accounts for 50% of the area of the second friction plate 5B, the width of the second arc groove is 1.5mm. Under this design, the two sides of the clutch can pass through The second friction plate 5B has the best effect of increasing the friction torque of the clutch.

In an embodiment of the present invention, a limit snap ring 7 is arranged in the groove of the cylinder liner 3 , and the limit snap ring 7 is connected to the pressing plate 6 .

In an embodiment of the present invention, both the dual steel plate 4 and the friction plate 5 can be used as an active plate or a passive plate.

In an embodiment of the present invention, the paired steel sheet 4 is circumferentially connected with the cylinder liner 3 , and the friction sheet 5 is connected with the input gear 8 . When the friction plate 5 is used as the driving plate, the friction plate 5 is connected with the input gear 8 through the inner spline, and the dual steel plate 4 is circumferentially meshed with the spline on the cylinder liner 3 through the outer spline. When the clutch is engaged, the control oil enters the cavity of the piston 1 and pushes the piston 1 to move in the axial direction against the resistance of the separation spring, eliminating the gap between the friction elements, and the dual steel plate 4 and the friction plate 5 realize the transmission of torque through sliding friction.

In an embodiment of the present invention, the material of the paired steel sheet 4 and the pressing plate 6 is the same, and the thickness of the pressing plate 6 is greater than that of the paired steel sheet 4 .

The beneficial effects of the present invention are as follows:

The invention quantitatively changes the arc groove area of the friction plates at different axial positions, so that the clutch can obtain the best comprehensive performance, the friction plates in the middle position improve the heat load environment in the middle of the clutch, and the friction plates on both sides of the clutch are used to improve the heat load environment of the clutch. Improve the friction torque of the clutch, this combination enables the clutch to obtain excellent friction torque, lower temperature rise, lower wear, improve the service life of friction elements, improve the reliability of the clutch, and even improve the transmission system and vehicle safety.

It should be understood that, for those skilled in the art, improvements or changes can be made according to the above description, and all these improvements and changes should fall within the protection scope of the appended claims of the present invention.

The patent of the present invention has been exemplarily described above. Obviously, the realization of the patent of the present invention is not limited by the above methods, as long as various improvements made in the method concept and technical solutions of the patent of the present invention are adopted, or the present invention is applied without improvement. If the concept and technical solution of the patent are directly applied to other occasions, they are all within the protection scope of the present invention.

Claims (9)

1. A wet multi-plate shift clutch, characterized in that it comprises a cylinder liner, a piston and a pressure plate are arranged in the cylinder liner, and a plurality of paired steel plates and a plurality of friction plates are arranged between the piston and the pressure plate. The pair of steel plates and the friction plates are alternately arranged, the friction plates include a first friction plate and a second friction plate, and first arc grooves are arranged on both sides of the first friction plate. Both sides of the second friction plate are provided with second arc grooves, Along the direction from the piston to the pressure plate, the first friction plate is arranged in the middle position of the clutch axial direction, the second friction plate is arranged on both sides of the first friction plate, and the first circle The ratio of the area of the arc groove to the area of the first friction plate is smaller than the ratio of the area of the second circular arc groove to the area of the second friction plate. 2 . The wet multi-plate shift clutch according to claim 1 , wherein the number ratio of the first friction plate to the second friction plate is 1 to 2, and the second friction plate is uniform. 3 . arranged on both sides of the first friction plate. 3 . The wet multi-disc shift clutch according to claim 1 , wherein the area of the first circular arc groove accounts for 30% to 40% of the area of the first friction plate, and the first The area of the two arc grooves accounts for 45% to 55% of the area of the second friction plate. 4 . The wet multi-disc shift clutch according to claim 3 , wherein the area of the first arc groove accounts for 35% of the area of the first friction plate, and the second arc groove accounts for 35% of the area of the first friction plate. 5 . The area of the groove accounts for 50% of the area of the second friction plate. 5 . The wet multi-disc shift clutch according to claim 3 , wherein the width of the first circular arc groove is 0.8 mm˜1.2 mm, and the width of the second circular arc groove is 1.3 mm. 6 . mm～1.7mm. 6 . The wet multi-disc shift clutch according to claim 5 , wherein the width of the first circular arc groove is 1 mm, and the width of the second circular arc groove is 1.5 mm. 7 . 7 . The wet multi-plate shift clutch according to claim 1 , wherein the first circular arc groove and the second circular arc groove are both 45° equally divided double circular arc grooves. 8 . 8 . The wet multi-plate shift clutch according to claim 1 , wherein the dual steel plates are straight steel plates. 9 . 9 . The wet multi-disc shift clutch according to claim 1 , wherein a limit snap ring is arranged in the groove of the cylinder liner, and the limit snap ring is connected with the pressure plate. 10 .

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